This application claims priority to and benefits of the following applications:

1) Chinese Patent Application Serial No. 201110211018.2, filed with the State Intellectual Property Office of P. . China on July 26, 2011;

2) Chinese Patent Application Serial No. 201110210959.4, filed with the State Intellectual Property Office of P. R. China on July 26, 2011;

3) Chinese Patent Application Serial No. 201110459473.4, filed with the State Intellectual Property Office of P. R. China on December 31, 2011; and

4) Chinese Patent Application Serial No.201110211021.4, filed with the State Intellectual Property Office of P. R. China on July 26, 2011.

The entire contents of the above applications are incorporated herein by reference.

FIELD

The present disclosure relates to an electronic apparatus design and fabrication field, and more particularly to a touch detecting method, a touch detecting assembly, a touch sensitive device, and a portable electronic apparatus.

BACKGROUND

Currently, an application range of a touch screen has been spread quickly from being used in a small minority commercial market, such as an ATM (automatic teller machine) in a bank and an industrial control computer to being applied in a mass consumption electronic apparatuses, such as mobile phones, PDA (personal digital assistant), GPS (global positioning system), PMP (such as MP3 or MP4) and panel computers. The touch screen, which has advantages of simple, convenient and humanized touch operations, will be a best human-computer interaction interface and be widely applied in portable apparatus.

A capacitance touch screen is generally divided into two types: self-capacitance type and mutual-capacitance type. Fig. 1 shows a structure of a conventional self-capacitance type touch screen. The self-capacitance type touch screen comprises a plurality of induction units 100' and 200' which have a diamond structure and are located in two different layers. A scan is performed along an X axis and a Y axis respectively, and if a capacitance variation of a certain intersection point exceeds a predetermined range, the intersection point is made as a touch point. Although a linearity of the self-capacitance type touch screen is good, ghost touch points still appear frequently, and thus it is difficult to realize a multipoint touch. In addition, since a double-layer screen is used, the structure is complicated and the cost is increased. Moreover, under a condition of a slight capacitance variation, the diamond structure may cause a coordinate drift, that is, the diamond structure may be easily affected by an external factor.

Fig. 2a shows a structure of another conventional self-capacitance type touch screen. The self-capacitance type touch screen uses a triangular screen structure. The self-capacitance type touch screen comprises: a substrate 300', a plurality of triangular induction units 400' disposed on the substrate 300', and a plurality of electrodes 500' connected with the triangular induction units 400' respectively. Fig. 2b shows a detecting principle of the self-capacitance type touch screen shown in Fig. 2a. An ellipse 600' represents a finger which contacts with two adjacent triangular induction units, SI represents a contact area between the finger and one of the two adjacent triangular induction units, and S2 represents a contact area between the finger and the other. Provided that an origin of coordinate is located at the lower-left corner, an X coordinate may be obtained by X=S2/(S 1+S2)*P, where P is a resolution ratio. When the finger moves rightwards, because S2 does not increase linearly, there is a deviation of the X coordinate. It may be known from the detecting principle that a single end detecting is performed for the conventional triangular induction unit, that is, the detecting is performed only from one direction, and coordinates in the two directions are calculated by an algorithm. Although the self-capacitance type touch detecting assembly has a simple structure, an induction capacitance of the screen is not optimized, so that the capacitance variation is small, thus reducing a signal-to-noise ratio. In addition, because each induction unit has a triangular shape, when the figure moves horizontally, the contact area may not increase linearly, thus causing the deviation of the X coordinate and a poor linearity accordingly.

In addition, because the capacitance variation of a conventional capacitance induction unit is small to a femtofarad order of magnitude, a measure circuit needs to satisfy a higher requirement because of an existence of a stray capacitance. Moreover, because the stray capacitance may vary because of many factors, such as temperature, position, and distribution of internal and external electric field, the stray capacitance may interfere with or even bury a tested capacitance signal. In addition, for a single-layer capacitance, because the induction capacitance may be seriously interfered by an influence of a level signal Vcom, which is used for preventing a liquid crystal of a LCD screen from aging.

SUMMARY

Embodiments of the present disclosure seek to solve at least one of the problems existing in the prior art, particularly to solve at least one defects of a conventional self -capacitance type touch screen.

According to a first aspect of the present disclosure, a touch sensitive device is provided. The touch sensitive device comprises: a substrate; a plurality of induction units disposed on the substrate and not intersecting with each other, each induction unit comprising a first electrode and a second electrode; and a control chip connected with the first electrodes and the second electrodes respectively, the control chip configured to apply a level signal to the first electrodes and/or the second electrodes to charge a self capacitor generated by a touch on the induction unit, to calculate a ratio between a first resistor between the first electrode of at least one induction unit and the self capacitor and a second resistor between a second electrode of the at least one induction unit and the self capacitor when the touch is detected on the induction unit, and to determine a touch position according to the ratio between the first resistor and the second resistor.

According to a second aspect of the present disclosure, a touch detecting assembly is provided. The touch detecting assembly comprises: a substrate; and a plurality of induction units disposed on the substrate and not intersecting with each other, wherein the induction unit comprising a first electrode and a second electrode, and each first electrode and each second electrode are connected with corresponding pins of a control chip.

According to a third aspect of the present disclosure, a touch detecting method is provided. The method comprises steps of: applying a level signal to a first electrode and/or a second electrode of a induction unit, the level signal charge a self capacitor generated by a touch on an induction unit; detecting whether a touch is on at least one induction unit; calculating a ratio between a first resistor between a first electrode of the at least one induction unit and the self capacitor and a second resistor between a second electrode of the at least one induction unit and the self capacitor if the touch is detected; and determining a touch position according to the ratio between the first resistor and the second resistor.

According to a fourth aspect of the present disclosure, a portable electronic apparatus comprising a touch sensitive device according to the first aspect of the present disclosure is provided.

According to a fifth aspect of the present disclosure, a portable electronic apparatus comprising a touch detecting assembly according to the second aspect of the present disclosure is provided.

Detections are performed at the first electrode and the second electrode in the touch detecting assembly according to an embodiment of the present disclosure. The two ends of the induction unit have electrodes respectively and each electrode is connected with a corresponding pin of the control chip. When the touch detection is performed, the touch position may be determined on the induction unit.

According to the embodiment of the present disclosure, the touch position may be determined by calculating the ratio between the first resistor and the second resistor. Compared with a conventional induction unit with a diamond or triangle structure, it is not required to calculate the self-capacitance when determining the touch position, and a precision of the touch position may not be influenced by the magnitude of the self capacitor, thus improving the detecting precision and the linearity.

With the touch detecting method according to the embodiment of the present disclosure, the self capacitor generated the touched induction unit is charged, and then the touch position in a first direction is determined according to the ratio between the first resistor and the second resistor. For example, in one embodiment, the ratio between the first resistor and the second resistor may be obtained according to a ratio between a first detecting value and a second detecting value obtained by detecting from the first electrode and/or the second electrode when the self capacitor is charged/discharged. Compared with a conventional self-capacitance detecting method, the method according to the embodiment of the present disclosure may greatly improve the detecting precision, a signal-to-noise ratio of a circuit and the linearity of an induction, and reduce a circuit noise. Moreover, a small current may be generated when the touched induction unit is charged or discharged during the detection, thus enhancing an anti-interference capacity.

Additional aspects and advantages of the embodiments of the present disclosure will be given in part in the following descriptions, become apparent in part from the following descriptions, or be learned from the practice of the embodiments of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other aspects and advantages of the disclosure will become apparent and more readily appreciated from the following descriptions taken in conjunction with the drawings in which:

Fig. 1 is a schematic structural view of a conventional self capacitor type touch screen;

Fig. 2a is a schematic structural view of another conventional self capacitor type touch screen;

Fig. 2b is a diagram showing a detecting principle of the another conventional self capacitor type touch screen of Fig. 2a;

Fig. 3 is a diagram showing a detecting principle of a touch sensitive device according to an embodiment of the present disclosure;

Fig. 4 is a flow chart showing a touch detecting method according to an embodiment of the present disclosure;

Fig. 5 is a schematic view showing a touch sensitive device according to an embodiment of the present disclosure;

Fig. 6a is a schematic structural view of an induction unit according to an embodiment of the present disclosure;

Fig. 6b is a schematic structural view of an induction unit according to another embodiment of the present disclosure;

Fig. 7a is a schematic structural view of a touch detecting assembly according to an embodiment of the present disclosure;

Fig. 7b is a schematic structural view of a touch detecting assembly according to another embodiment of the present disclosure;

Fig. 8 is a schematic view showing that an induction unit is touched according to an embodiment of the present disclosure;

Fig. 9a is a schematic structural view of a touch detecting assembly according to still another embodiment of the present disclosure;

Fig. 9b is a schematic structural view of a touch detecting assembly according to yet another embodiment of the present disclosure; and

Fig. 10 is a schematic view showing that an induction unit is touched according to an embodiment of the present disclosure. DETAILED DESCRIPTION

Reference will be made in detail to embodiments of the present disclosure. The embodiments described herein with reference to drawings are explanatory, illustrative, and used to generally understand the present disclosure. The embodiments shall not be construed to limit the present disclosure. The same or similar elements and the elements having same or similar functions are denoted by like reference numerals throughout the descriptions.

An embodiment of the present disclosure adopts a novel self capacitor detecting method. When an induction unit is touched, a touch position may divide the induction unit into two resistors. When the self capacitor detection is performed, the touch position on the induction unit may be determined by taking into account the two resistors. Fig. 3 is a diagram showing a detecting principle of a touch sensitive device according to an embodiment of the present disclosure. When a finger touches the induction unit, the induction unit is divided into the first resistor Rl and the second resistor R2 and a ratio between Rl and R2 is related to the touch position. For example, as shown in Fig. 3, when the touch position is closer to the first electrode 210, the first resistor Rl is comparatively small and the second resistor R2 is comparatively large; in contrast, when the touch position is closer to the second electrode 220, the first resistor Rl is comparatively large and the second resistor R2 is comparatively small. Therefore, by detecting the first resistor Rl and the second resistor R2, the touch position on the induction unit may be determined.

In the embodiments of the present disclosure, the first resistor Rl and the second resistor R2 may be determined in various ways, for example, by detecting one or more of a current detecting value from a first electrode and a second electrode, a self capacitor detecting value, a level signal detecting value and a charge variation, and thus the first resistor Rl and the second resistor R2 may be obtained based on the above detecting values. In addition, in the embodiments of the present disclosure, the above detecting values may be detected when the self capacitor is charged (i.e., obtaining the first charge detecting value and the second charge detecting value), or may be detected when the self capacitor is discharged (i.e., obtaining the first discharge detecting value and the second discharge detecting value). In addition, various ways may be adopted to perform the detection during the charge or discharge period.

It should be noted that at least the charge or discharge is performed from the first electrode 210 and the second electrode 220 so as to obtain two detecting values reflecting a difference between the first resistor l and the second resistor R2, i.e., the first detecting value and the second detecting value. That is, during charge or discharge period, there is a current flowing through the first resistor Rl and the second resistor R2 so that the first detecting value and the second detecting value detected may reflect the difference between the first resistor Rl and the second resistor R2.

In the embodiments of the present disclosure, the charge and the detection are generally needed to be performed twice, and the charge comprises the charge from the first electrode 210 and the second electrode 220 simultaneously. In some embodiments, discharge may be performed twice. For convenience, the charge and the detection are each performed twice in the following embodiments. It should be noted that performing charge and detection twice is only an example with a comparatively simple algorithm for realizing the embodiments. However, those skilled in the art may increase a number of times of charge and detection, for example, the charge and the detection may be performed three times, then the first resistor Rl is calculated according to the first time charge detecting value and the second time charge detecting value, and the second resistor R2 is calculated according to the first time charge detecting value and the third time charge detecting value.

Specifically, according to the embodiments of the present disclosure, the detecting methods comprise, but are not limited to, the following methods.

1. Firstly, the first electrode 210 and the second electrode 220 of the induction unit are applied with level signals to charge the self capacitor (generated when the induction unit is touched); and then a charge detection is performed from the first electrode 210 and/or the second electrode 220 to obtain a first charge detecting value and a second charge detecting value. In the embodiment, since the charge is performed from the first electrode 210 and the second electrode 220, the detection may be performed from the first electrode 210, from the second electrode 220 or from the first electrode 210 and the second electrode 220 respectively. It should be noted that in the embodiment, charge from the first electrode 210 and from the second electrode 220 may be performed simultaneously or separately. For example, a same level signal may be applied to the first electrode 210 and the second electrode 220 simultaneously to charge the self capacitor. In other embodiments, the level signals applied to the first electrode 210 and the second electrode 220 may be different; or one level signal may be applied to the first electrode 210 first and then a same or different level signal may be applied to the second electrode 220. Similarly, the detections from the first electrode 210 and the second electrode 220 may be performed simultaneously or separately. In the following embodiments, the charge and the detection may be performed simultaneously or separately, and the discharge and the detection may be performed simultaneously or separately.

2. The first electrode 210 or the second electrode 220 of the induction unit is applied with a level signal twice to charge the self capacitor twice; and after each charge, a charge detection is performed from the first electrode 210 and/or the second electrode 220 to obtain a first charge detecting value and a second charge detecting value. In the embodiment, since the charge is performed from the first electrode 210 or the second electrode 220, the detection needs to be performed from the first electrode 210 and the second electrode 220 respectively. It should be noted that in the embodiment, charge from the first electrode 210 and from the second electrode 220 may be performed simultaneously or separately. In addition, alternatively, charge may be performed from the first electrode 210 twice and detection may be performed from the first electrode 210 twice; or charge may be performed from the second electrode 220 twice and detection may be performed from the second electrode 220 twice. When the charge is performed from one electrode twice, the other electrode is grounded or connected with a large resistor to change the status of the other electrode. For example, when the level signals are applied to the first electrode 210 twice to charge the self capacitor twice, during the first time charge, the second electrode 220 is grounded, and during the second time charge, the second electrode 220 is connected with a large resistor; and when the level signals are applied to the second electrode 220 twice to charge the self capacitor twice, during the first time charge, the first electrode 210 is grounded, and during the second time charge, the first electrode 210 is connected with a large resistor. Thus, even if the charge is performed two times from the first electrode 210, because of a change of a status of the second electrode 220, the detection may be performed two times from the first electrode 210 to obtain the first detecting value and the second detecting value reflecting the ratio between the first resistor l and the second resistor R2.

3. The first electrode 210 and the second electrode 220 of the induction unit are applied with level signals to charge the self capacitor; and then the first electrode 210 and/or the second electrode 220 are controlled to be grounded to discharge the self capacitor; and then a discharge detection is performed from the first electrode 210 and/or the second electrode 220 to obtain a first discharge detecting value and a second discharge detecting value. In the embodiment, since the charge of the self capacitor is performed from the first electrode 210 and the second electrode 220, the discharge or detection may be performed from the first electrode 210 and/or the second electrode 220. Specifically, the first electrode 210 and the second electrode 220 may be applied with level signals simultaneously or separately to charge the self capacitor. During the two times discharge, the first electrode 210 may be grounded two times respectively or the second electrode 220 may be grounded two times respectively.

4. The first electrode 210 or the second electrode 220 of the induction unit is applied with a level signal to charge the self capacitor; and then the first electrode 210 and the second electrode 220 are controlled to be grounded to discharge the self capacitor respectively; and then a discharge detection is performed from the first electrode 210 and/or the second electrode 220 to obtain a first discharge detecting value and a second discharge detecting value. In the embodiment, since the discharge of the self capacitor is performed from the first electrode 210 and the second electrode 220, the charge or detection may be performed from the first electrode 210 and/or the second electrode 220. In the embodiment, the charge may be performed from the first electrode 210 two times and the second electrode 220 may be grounded or connected with a large resistor; also, the charge may be performed from the second electrode 220 two times and the first electrode 210 may be grounded or connected with a large resistor.

5. The first electrode 210 or the second electrode 220 of the induction unit is applied with a level signal to charge the self capacitor; and then the first electrode 210 or the second electrode 220 is controlled to be grounded to discharge the self capacitor; and then a discharge detection is performed from the first electrode 210 and the second electrode 220 to obtain a first discharge detecting value and a second discharge detecting value. In the embodiment, since the detection of the self capacitor is performed from the first electrode 210 and the second electrode 220, the charge or discharge may be performed from the first electrode 210 and/or the second electrode 220. In the embodiment, the charge may be performed from the first electrode 210 two times and the second electrode 220 may be grounded or connected with a large resistor; also, the charge may be performed from the second electrode 220 two times and the first electrode 210 may be grounded or connected with a large resistor.

Alternatively, based on the above embodiments, a first detection may be performed when charge the self capacitor to obtain the first charge detecting value and a second detection may be performed when discharge the self capacitor to obtain the second discharge detecting value, and then a ratio between the first resistor Rl and the second resistor R2 may be obtained according to the first charge detecting value and the second discharge detecting value.

It should be noted that in the embodiments of the present disclosure, a function of the first electrode 210 and the second electrode 220 are the same and the first electrode 210 and the second electrode 220 are interchangeable. Therefore, in the above embodiments, the detection may be performed from the first electrode 210 or from the second electrode 220, as long as there is a current flowing through the first resistor Rl and the second resistor R2 during the charge, discharge and detection.

The above embodiments show that there may be many variations with respect to the charge and detection. According to an embodiment of the present disclosure, the touch position is determined according to a relation (for example, ratio) between the first resistor Rl and the second resistor R2. Further, the relation between the first resistor Rl and the second resistor R2 is detected by charging and/or discharging the self capacitor. If the induction unit is not touched, no self capacitor will be generated and no touch is on the induction unit may be determined. Therefore, in the embodiments of the present disclosure, a scan will be repeated until the finger touches the induction unit, which will not be illustrated in detail here.

In the embodiments of the present disclosure, corresponding voltages may be applied to the plurality of induction units sequentially and the detection may be performed for the plurality of induction units sequentially.

It should be noted that the above detecting methods are only some preferable methods according to the embodiments of the present disclosure and those skilled in the art may expand, amend or modify the embodiments without departing from the spirits of the present disclosure.

Fig. 4 is a flow chart showing a touch detecting method of a touch sensitive device according to an embodiment of the present disclosure. The touch detecting method will be described with reference to the principle view of Fig. 3. The touch detecting method comprises the following steps.

In step S401, level signals are applied to two ends of the induction unit, i.e., level signals are applied to the first electrode 210 and/or the second electrode 220 of the induction unit. In the embodiment, same or different level signals may be applied to the first electrode 210 and the second electrode 220. In other embodiments, the charge may be performed two times from the first electrode 210 or the second electrode 220; or the charge may be performed from the first electrode 210 for the first time and from the second electrode 220 for the second time; or the charge may be performed from the second electrode 220 for the first time and from the first electrode 210 for the second time.

If the induction unit is touched by a finger or other objects at this time, a self capacitor CI will be generated in the induction unit (referring to Fig. 3). The self capacitor CI may be charged by the applied level signals. In the embodiments, by charging the self capacitor CI, the detecting precision of the self capacitor CI may be improved.

It should be noted that if level signals are applied to the two ends of the induction unit simultaneously, two capacitance detecting modules are needed to perform detection from the first electrode 210 and the second electrode 220 simultaneously. If the level signals are applied to the two ends of the induction unit separately, only one capacitance detecting module is needed. In one embodiment of the present disclosure, the first detecting value and the second detecting value may be the charge variations AQl and AQ2 of the self capacitor CI detected from the first electrode 210 and/or the second electrode 220. The charge variation of the self capacitor CI may be obtained according to AQl and AQ2, and the ratio between l and R2 may be obtained. An X coordinate of the touch position may be calculated and finally a position of the self capacitor CI may be obtained according to a regularly linear relationship of a shape of each induction unit.

In step S402, the induction unit is detected from the two ends thereof to obtain the first detecting value and the second detecting value. In the embodiment, the detection may be performed during the charge or discharge period. In the above examples, the first detecting value and the second detecting value are AQl and AQ2 respectively. In the following description, AQ l and AQ2 are taken as the first detecting value and the second detecting value. However, other detecting values, such as level signals or currents, which may reflect the relation between the first resistor Rl and the second resistor R2, may also be adopted. In the embodiment of the present disclosure, the detections from the first electrode 210 and from the second electrode 220 may be performed simultaneously or separately.

In one embodiment of the present disclosure, if the detections are performed simultaneously, two capacitance detecting modules are needed to detect from the first electrode 210 and the second electrode 220.

In another embodiment of the present disclosure, one capacitance detecting module may be used to perform the detection. Referring to step S401, after the self capacitor CI is fully charged from the first electrode 210, the capacitance detecting module detects the self capacitor CI from the first electrode 210. Then, the self capacitor CI is charged from the second electrode 220 and the capacitance detecting module detects the self capacitor CI from the second electrode 220.

When the control chip scans the induction unit, it uses the same phase and level signal, so that for the same self capacitor C 1 , the charge during the charge period is in reverse proportion to its resistance. Assuming the charge variations detected from the first electrode 210 and the second electrode 220 are AQl and AQ2 respectively. In the embodiments of the present disclosure, the capacitance detecting module may be any known capacitance detecting module in the art. In an embodiment, if two capacitance detecting modules are used, they may share many means, so that the overall power consumption of the control chip may not be increased.

In step S403, it is determined whether the induction unit is touched according to the first detecting value and the second detecting value. Specifically, in one embodiment, it may be determined whether the induction unit is touched by judging whether the charge variations AQ 1 and AQ2 are larger than a threshold. Of course, in other embodiments, other judging methods may be used, for example, a method of judging whether the charge variations AQl and AQ2 are smaller than a threshold. If the charge variations AQl and AQ2 are smaller than a threshold, it is determined that the induction unit is touched. Similarly, the threshold may be determined according to a size and type of a touch screen and according to a size of the induction unit.

In step S404, if it is determined that the induction unit is touched, a ratio between a first resistor between the first electrode 210 and the self capacitor and a second resistor between the second electrode 220 and the self capacitor may be calculated. The touch position of a touch object (for example, a finger) may be determined according to the ratio between the first resistor and the second resistor. In the embodiments, the ratio between the first resistor and the second resistor is calculated according to the ratio between the first detecting value and the second detecting value obtained by detecting from the first electrode 210 and/or the second electrode 220 when the self capacitor is charged/discharged. The coordinates of the self capacitor CI on the induction unit is AQ2/(AQ1+AQ2).

In the embodiments, if the induction unit has a substantially U shape or a substantially L shape, the touch position on the touch screen may be determined according to the ratio between the first resistor and the second resistor, which will be described in detail with reference to examples. However, in other embodiments, if the induction unit has a substantially rectangular shape or a snakelike shape (which is substantially equivalent to a rectangular shape), then in step S404, only the touch position in the first direction on the touch screen may be calculated and the first direction may be a length direction of the induction unit (for example, a horizontal direction of the touch screen).

If the induction unit has a rectangular shape or a snakelike shape (which is substantially equivalent to a rectangular shape), the touch position in the second direction may further need to be determined. In one embodiment, the first direction is the length direction of the induction unit, the second direction is the direction orthogonal to the first direction, and the induction unit is disposed horizontally or vertically.

Specifically, the touch position in the second direction may be calculated according to the centroid algorithm, which will be briefly discussed below.

In slide bar and touch pad applications, a position of a finger (or other capacitive objects) may be determined according to the induction units touched. A contact area of a finger on the slide bar or touch pad is usually larger than any induction unit. In order to use a center to calculate the touched position, it is effective to scan this array to verify the touch position, and a requirement for the number of adjacent induction units is that the signal is larger than a predetermined touch threshold. After the strongest signal has been found, the strongest signal and those adjacent signals larger than the touch threshold are used to calculate the center.

\r =— n i.ii. (i-l ) +n 1.i + n _i il ₊ l _l (i+l )

η _{; ι} +η _; + n _i+1

N _Cent is an identifier of a central induction unit, n is the number of the touched induction units, i is a sequence of the touched induction unit and i is larger than or equal to 2.

For example, when the finger touches the first path, the capacitance change amount of the first path is yl, the capacitance change amount of the second path is y2 and the capacitance change amount of the third path is y3, among which y2 is the largest. Then, the coordinate Y may be calculated as: _γ _ y\ * 1 + yl * 2 + yl * 3

y\ + y2 + y3

Embodiments according to a first aspect of the present disclosure provide a touch sensitive device according to the above description. The touch sensitive device comprises a substrate and a plurality of induction units. The plurality of induction units are disposed on the substrate and do not intersect with each other. In the embodiment, the induction units may be parallel with each other. Alternatively, the induction units may be substantially parallel with each other. For example, one induction unit is inclined by a predetermined angle with respect to another induction unit, but every two induction units do not intersect with each other on the substrate. Each induction unit has a first electrode and a second electrode disposed opposite to the first electrode. Fig. 5 is a schematic view showing a touch sensitive device according to an embodiment of the present disclosure. The touch sensitive device comprises: a substrate 100, a plurality of induction units 200 not intersecting with each other, and a control chip 300. In this embodiment, the substrate 100 is a single-layer substrate. As shown in Fig. 5, rectangular induction units 200, which has a large length-width ratio, are adopted for the touch sensitive device, and each induction unit 200 has a first electrode 210 and a second electrode 220 disposed opposite to each other. The rectangular induction units 200 parallel to each other may be used to reduce a structure complexity of a device, thus reducing a manufacturing cost while ensuring a detecting precision. However, it should be noted that a structure of the induction units 200 may not be limited to that shown in Fig. 5 and may adopt other structures. For example, some or all of the induction units 2 may have an arc shape.

The control chip 300 is connected with the first electrode 210 and the second electrode 220 respectively. The control chip 300 is configured to apply a level signal to the first electrode 210 and/or the second electrode 220 to charge a self capacitor generated by a touch of on an induction unit 200; to calculate a ratio between a first resistor between a first electrode 210 of at least one induction unit 200 and the self capacitor and a second resistor between a second electrode 220 of the at least one induction unit 200 and the self capacitor when a touch on the at least one induction unit 200 is detected by the control chip 300; and to determine a touch position of the touched induction unit 200 according to the ratio between the first resistor and the second resistor.

In some embodiment of the present invention, the ratio between the first resistor and the second resistor is calculated by a ratio between a first detecting value and a second detecting value obtained by detecting from the first electrode and/or the second electrode when the self capacitor is charge/discharge. The charge and detection from the first electrode and the second electrode may be performed simultaneously or separately, and the discharge and detection from the first electrode and the second electrode may be performed simultaneously or separately. When the control chip 300 determines that a corresponding induction unit 200 is touched according to the first detecting value and the second detecting value, the control chip 300 calculates the ratio between the first resistor and the second resistor according to the first detecting value and the second detecting value to further determine a touch position in a first direction, and to determine the touch position in a second direction according to a position of the corresponding induction unit 200. Finally, the control chip 300 may determine the final touch position on the touch screen according to the touch position in the first direction and the touch position in the second direction. It should be noted that a sequence of charge or discharge the induction unit in the embodiment is not limited. For example, in one embodiment, all the induction units 200 may be charged sequentially in a scan mode and then a discharge detection is performed on all the induction units 200 sequentially. In another embodiment, the induction units 200 may be charged and discharged one by one. For example, after one induction unit 200 is charged, the discharge detection is immediately performed on the one induction unit 200. Thereafter, a same operation is performed on a next induction unit 200. In another embodiment, the control chip 300 applies level signals to the first electrode 210 and the second electrode 220 of the induction units 200 so as to charge the self capacitor, and the control chip 300 performs the charge detection from the first electrode 210 and/or the second electrode 220 so as to obtain the first charge detecting value and the second charge detecting value.

In one embodiment, the control chip 300 applies a level signal to the first electrode 210 or the second electrode 220 of the at least one touched induction unit 200 so as to charge the self capacitor, and the control chip 300 performs a charge detection from the first electrode 210 and the second electrode 220 of the at least one touched induction unit 200 so as to obtain the first charge detecting value and the second charge detecting value.

In one embodiment, the control chip 300 applies a level signal to the first electrode 210 and the second electrode 220 of the at least one touched induction unit 200 so as to charge the self capacitor, the control chip 300 controls the first electrode 210 and/or the second electrode 220 of the at least one touched induction unit 200 to be grounded so as to discharge the self capacitor, and the control chip 300 performs a discharge detection from the first electrode 210 and/or the second electrode 220 of the at least one touched induction unit 200 so as to obtain the first discharge detecting value and the second discharge detecting value.

In one embodiment, the control chip 300 applies a level signal to the first electrode 210 or the second electrode 220 of the at least one touched induction unit 200 so as to charge the self capacitor, the control chip 300 controls the first electrode 210 and the second electrode 220 of the at least one touched induction unit 200 to be grounded respectively so as to discharge the self capacitor, and the control chip 300 performs a discharge detection from the first electrode 210 and/or the second electrode 220 of the at least one touched induction unit 200 so as to obtain the first discharge detecting value and the second discharge detecting value.

In one embodiment, the control chip 300 applies a level signal to the first electrode 210 or the second electrode 220 of the at least one touched induction unit 200 so as to charge the self capacitor, the control chip 300 controls the first electrode 210 or the second electrode 220 of the at least one touched induction unit 200 to be grounded so as to discharge the self capacitor, and the control chip 300 performs a discharge detection from the first electrode 210 and the second electrode 220 of the at least one touched induction unit 200 so as to obtain the first discharge detecting value and the second discharge detecting value respectively.

In one embodiment, the first direction is the length direction of each induction unit 200, and the second direction is the direction vertical to each induction unit 200. Specifically, each induction unit 200 is disposed horizontally or vertically. Although in this embodiment, each induction unit 200 is disposed horizontally as shown in Fig. 5, in another embodiment, each induction unit 200 may be disposed vertically.

Those skilled in the art may understand that for the induction unit 200, the specific structure is not needed as long as a length of the induction unit 200 satisfies a requirement of the touch screen and the two electrodes at the two ends of the induction unit 200 are connected with different pins of the control chip 300 respectively to charge and discharge the induction unit 200. The induction unit 200 may have various structures and those skilled in the art may modify or improve the induction unit based on the spirits of the present disclosure. An improved structure of an induction unit is provided according to an embodiment of the present disclosure.

Fig. 6a is a schematic structural view of an induction unit according to an embodiment of the present disclosure. As shown in Fig. 6a, the induction unit comprises: a plurality of first parts 230 and a plurality of parallel second parts 240. Every two adjacent first parts 230 are connected via one second part 240 to form a plurality of first trenches 1000 and a plurality of second trenches 2000, the first trench 1000 and the second trench 2000 are disposed alternately. An opening direction of the plurality of first trenches 1000 is opposite to an opening direction of the plurality of second trenches 2000, and the touch position is a touch position in the first direction. In one embodiment, each second part 240 is arranged in the first direction. The plurality of first parts 230 may be parallel with each other, or may not be parallel with each other. In one embodiment, each second part 240 may have a rectangular shape, and each first part 230 may have a rectangular shape or other various shapes. In the embodiment, an impedance of a resistor may be increased by the first parts 230, thus increasing an impedance of the induction unit 200. Therefore, detections of the first resistor and the second resistor may be easier, thus further improving the detection precision. In the embodiment, preferably, distances between every two adjacent second parts 240 are identical so as to increase the impedance of the induction unit 200 uniformly, thus improving the detection precision. In one embodiment, the first direction is the length direction of each induction unit 200, and the second direction may be the direction vertical to each induction unit 200. Specifically, each induction unit 200 is disposed horizontally or vertically. In some embodiment of the present invention, as shown in Fig. 6a, if a finger touches a first part 230, the first direction is a length direction of the first part 230, i.e., a vertical direction of the substrate 100, and the second direction is a direction vertical to the first direction, i.e., a horizontal direction of the substrate 100. If a finger touches a second part 240, the first direction is a width direction of the first part 230, i.e., the horizontal direction of the substrate 100, and the second direction is a direction vertical to the first direction, i.e., the vertical direction of the substrate 100.

In one embodiment, a size of each induction unit 200 in the length direction thereof is substantially identical with a size of the substrate. Therefore, a structure complexity of the touch sensitive device may be reduced, and the touch sensitive device is easy to manufacture, thus reducing a manufacturing cost.

In one embodiment, the first electrode 210 and the second electrode 220 are connected with two of the plurality of first parts 230 respectively, as shown in Fig. 6a. In another embodiment, the first electrode 210 and the second electrode 220 are connected with two of the plurality of second parts 240 respectively, as shown in Fig. 6b.

Moreover, in one embodiment, each second part 240 is vertical to each first part 230, that is, an angle between each second part 240 and each first part 230 is 90 degrees in this embodiment, but is not limited to 90 degrees. As shown in Fig. 6a, a plurality of first parts 230 are connected end to end via a plurality of second parts 240, and the first electrode 210 and the second electrode 220 of each induction unit 200 are connected with two first parts 230 at two ends of the each induction unit 200. In terms of an overall structure, the induction unit 200 has a rectangular shape with a large length-to-width ratio. It should be noted that, although each induction unit 200 is disposed along an X axis in Fig. 6a, those skilled in the art should understand that each induction unit 200 may be disposed along a Y axis in another embodiment. With the touch detecting assembly comprising the above induction unit according to an embodiment of the present disclosure, a noise may be effectively reduced, and a linearity of an induction may be improved.

Fig. 7a is a schematic structural view of an induction unit according to another embodiment of the present disclosure. As shown in Fig. 7a, in this embodiment, each induction unit 200 has a substantially U shape, and lengths of the plurality of induction units 200 are different from each other, and the plurality of induction units 200 are partly embedded one by one. Each induction unit 200 comprises: a third part 250, a fourth part 260, and a fifth part 270 not intersecting with the fourth part 260. In one embodiment, each third part 250 is parallel with a first side 110 of the substrate 100, and each fourth part 260 and each fifth part 270 are parallel with a second side 120 of the substrate 100 respectively. One end of the fourth part 260 is connected with one end of the third part 250, one end of the fifth part 270 is connected with the other end of the third part 250, the other end of the fourth part 260 comprises the first electrode 210, and the other end of the fifth part 270 comprises the second electrode 220. Each first electrode 210 and each second electrode 220 are connected with corresponding pins of the control chip 300.

In the embodiment, "partly embedded one by one" means an outer induction unit partly surrounds an inner induction unit, for example, as shown in Fig. 7a, so as to achieve a comparatively large contact area while guaranteeing a detecting precision, reducing computing complexity and improving a responding speed of the touch screen. Certainly, those skilled in the art may adopt other embedding methods to arrange the induction units according to principles shown in Fig. 7a. In one embodiment, the third parts 250 of the plurality of induction units 200 are parallel with each other, the fourth parts 260 of the plurality of induction units 200 are parallel with each other, and the fifth parts 270 of the plurality of induction units 200 are parallel with each other. In one embodiment, at least one of the third part 250, the fourth part 260 and the fifth part 270 of each induction unit 200 has a rectangular shape. Preferably, all of the third part 250, the fourth part 260 and the fifth part 270 of each induction unit 200 have a rectangular shape. In this embodiment, because of the rectangular shape, when the finger moves horizontally or vertically, the linearity may be good. In addition, distances between every two adjacent rectangular structures are identical so as to improve the computing speed.

In one embodiment, lengths of the fourth part 260 and the fifth part 270 of each induction unit 200 are identical.

In one embodiment, the substrate 100 has a rectangular shape, the first side 110 and the second side 120 are vertical to each other, the fourth part 260 and the third part 250 of each induction unit 200 are vertical to each other, and the fifth part 270 and the third part 250 of each induction unit 200 are vertical to each other.

In one embodiment, distances between the third parts 250 of every two adjacent induction units 200 are identical, distances between the fourth parts 260 of every two adjacent induction units 200 are identical, and distances between the fifth parts 270 of every two adjacent induction units 200 are identical. Therefore, the plurality of induction units 200 may be used to uniformly divide the first side 110 and the first side 120 of the substrate 100 to improve a computing speed. Of course, in other embodiments, distances between the third parts 250 of every two adjacent induction units 200 may be different, or distances between the fourth parts 260 of every two adjacent induction units 200 may be different, as shown in Fig. 7b. For example, since a user usually touches a central part of the touch screen, a distance between the induction units 200 at the central part of the touch screen may be reduced to improve a detecting precision at the central part of the touch screen.

In one embodiment, each induction unit 200 is symmetrical with respect to a central axis Y of the substrate 100, as shown in Fig. 7a, and the central axis Y of the substrate 100 is vertical to the third part 250 of each induction unit 200, thus improving a precision.

As shown in Fig. 7a, in this embodiment, both the first electrode 210 and the second electrode 220 of each induction unit 200 are located at the first side 110 of the substrate 100. In this embodiment, after a touch position on an induction unit is detected, a touch position on the touch screen may be obtained.

It should be noted that the substantially U-shaped induction units 200 shown in Fig. 7a are only examples of the induction unit, which may achieve a larger contact area. However, there may be variations to the embodiments shown in Fig. 7a. For example, the fourth part 260 and the fifth part 270 of each induction unit 200 may not be parallel to each other. With the substantially U-shaped induction unit 200 according to the above embodiment of the present disclosure, a structure complexity of a device may be reduced and the device is easy to manufacture. All the electrodes are located at one side, which are easy to manufacture, thus reducing a manufacturing cost.

Fig. 8 is a schematic view showing that an induction unit of a touch screen is touched according to an embodiment of the present disclosure. As shown in Fig. 8, the touch position A is near the second electrode 220. Assume the length of the induction unit 200 has a length of ten units by which the induction unit 200 is uniformly divided into 10 parts. The third part 250 has a length of four units, and each of the fourth part 260 and the fifth part 270 has a length of three units. After detection, it is obtained that a ratio between the first resistor and the second resistor is 4: 1, that is, a distance from the first electrode 210 to the touch position (reflected by the first resistor) accounts for 80% of the whole length of the induction unit 200. In other words, the touch point is at a position whose distance to the first electrode 210 is 8 units, or the touch point is at a position whose distance to the second electrode 220 is 2 units. Since the touch position will move accordingly when the finger moves, a corresponding moving track of the finger may be judged according to a movement of the touch position, thus judging an input instruction of a user.

From the examples shown in Fig. 8, it is clear that a computing method of the touch screen according to an embodiment of the present disclosure is simple, which may improve a responding speed of the detection of the touch screen.

Fig. 9b is a schematic structural view of a touch detecting assembly according to an embodiment of the present disclosure. In this embodiment, lengths of the plurality of induction units 200 increase gradually, and each induction unit 200 comprises a sixth part 280 and a seventh part 290. One end of the sixth part 280 comprises the first electrode 210, one end of the seventh part 290 is connected with the other end of the sixth part 280, and the other end of the seventh part 290 comprises the second electrode 220.

Specifically, each sixth part 280 is parallel with the first side 110 of the substrate 100, each seventh part 290 is parallel with the second side 120 of the substrate 100, and the first side 110 and the second side 120 are adjacent to each other. Each first electrode 210 and each second electrode 220 are connected with corresponding pins of the control chip 300.

In one embodiment, the sixth parts 280 of the plurality of induction units 200 are parallel with each other, and the seventh parts 290 of the plurality of induction units 200 are parallel with each other, which may effectively increase the coverage rate of the induction units 200 on the touch screen. In one embodiment, at least one of the sixth part 280 and the seventh part 290 of each induction unit 200 has a rectangular shape. Preferably, both the sixth part 280 and the seventh part 290 of each induction unit 200 have a rectangular shape. In this embodiment, because of the rectangular shape, when the finger moves horizontally or vertically, the linearity may be good. In addition, distances between every two adjacent rectangular structures are identical so as to improve the computing speed.

Detections are performed at two ends of each induction unit in the touch detecting assembly according to an embodiment of the present disclosure. The two ends of the induction unit have electrodes respectively and each electrode is connected with a corresponding pin of the control chip. When the touch detection is performed, the touch position may be determined on the induction unit.

More importantly, the touch position is determined according to the ratio between the first resistor Rl and the second resistor R2. Compared with the conventional diamond or triangular designs, the self capacitor doesn't need to be calculated when determining the touch position, and the magnitude of the self capacitor will not influence the precision of the touch position, and thus the self capacitor detection doesn't need to be as precise as before and the detecting precision and the linearity may be improved. In addition, since any one of the sixth part 280 and the seventh part 290 may have a regular rectangular shape, compared with the conventional diamond or triangular designs, the linearity may be further improved.

In one embodiment, lengths of the sixth part 280 and the seventh part 290 of each induction unit 200 are identical so as to improve the computing speed. In one embodiment, the substrate 100 has a rectangular shape, and the first side 110 and the second side 120 are vertical to each other, which may allow a more regular design for the induction unit. For example, the sixth part 280 and the seventh part 290 of each induction unit 200 are vertical to each other, thus increasing a coverage rate of the induction units on a touch screen and improving a linearity of the detection.

In one embodiment, distances between every two adjacent induction units 200 are identical, so that the plurality of induction units 200 may be used to uniformly divide the first side 110 and the second side 120 of the substrate 100 to improve a computing speed. Of course, in other embodiments, distances between every two adjacent induction units 200 may be different, as shown in Fig. 9b. For example, since a user usually touches a central part of the touch screen, a distance between the induction units 200 at the central part of the touch screen may be reduced to improve the detecting precision at the central part of the touch screen.

As shown in Fig. 9a, in this embodiment, the first electrode 210 of each induction unit 200 is located at the first side 110 of the substrate 100, the second electrode 220 of each induction unit 200 is located at the second side 110 of the substrate 100, and the first side 110 and the second side 120 are vertical to each other. In this embodiment, after a touch position on an induction unit is detected, the touch position on the touch screen may be obtained.

Fig. 10 is a schematic view showing that an induction unit of a touch screen is touched according to an embodiment of the present disclosure. As shown in Fig. 10, the touch position A is near the second electrode 220. Assume the length of the induction unit 200 has a length of 10 units by which the induction unit 200 is uniformly divided into 10 parts. The sixth part 280 has a length of 5 units, and the seventh part 290 has a length of 5 units. After detection, it is obtained that a ratio between the first resistor and the second resistor is 9:1, that is, a distance from the first electrode 210 to the touch position (reflected by the first resistor) accounts for 90% of the whole length of the induction unit 200. In other words, the touch point is at a position whose distance to the first electrode 210 is 9 units, or the touch point is at a position whose distance to the second electrode 220 is 1 units.

From the examples shown in Fig. 10, it is clear that a computing method of the touch screen according to an embodiment of the present disclosure is simple, which may improve the responding speed of the detection of the touch screen.

In one embodiment, the plurality of induction units 200 are located in a same layer. Therefore, only one ITO layer is required, thus reducing a manufacturing cost largely while guaranteeing a precision.

Detections are performed at two ends of each induction unit in the touch detecting assembly according to an embodiment of the present disclosure. The two ends of the induction unit have electrodes respectively and each electrode is connected with a corresponding pin of the control chip. When the touch detection is performed, the touch position may be determined on the induction unit.

More importantly, the touch position is determined according to the ratio between the first resistor Rl and the second resistor R2. Compared with the conventional diamond or triangular designs, the self capacitor doesn't need to be calculated when determining the touch position, and the magnitude of the self capacitor will not influence the precision of the touch position, and thus the self capacitor detection doesn't need to be as precise as before and the detecting precision and the linearity may be improved.

In summary, according to an embodiment of the present discourse, level signals are applied to electrodes of the induction unit at both ends of the induction unit. A self capacitor may be generated when the induction unit is touched. Therefore, the self capacitor may be charged by the applied level signals and a touch position may be determined according to a ratio between the first resistor and the second resistor. For example, in one embodiment, the ratio between the first resistor and the second resistor is calculated by a ratio between a first detecting value and a second detecting value obtained by detecting from the first electrode and/or the second electrode when the self capacitor is charged/discharged. Therefore, the first detecting value and the second detecting value may be detected from the first electrode and/or the second electrode when the self capacitor is charged/discharged. Thus, the first detecting value and the second detecting value may reflect the touch position on the induction unit, and the touch position on the induction unit may be further determined.

The touch sensitive device according to an embodiment of the present disclosure adopts a novel self capacitor detecting method. When the induction unit is touched, a self capacitor is generated at the touch position on the touch sensitive device, and the touch position may divide the induction unit into two resistors. When the self capacitor detection is performed, the touch position on the induction unit may be determined by taking into account the two resistors. The touch sensitive device according to an embodiment of the present disclosure is simple in structure. Moreover, for one induction unit, the charge or discharge may be performed from the first electrode and/or the second electrode of the one induction unit, and the detection may be performed during the charge or discharge period, which may not only reduce a RC constant, save time and improve an efficiency, but also ensure that a coordinate may not drift. In addition, with the touch sensitive device according to an embodiment of the present disclosure, the signal-to-noise ratio of a circuit may be effectively increased, the noise of the circuit may be reduced, and a linearity of an induction may be improved. Furthermore, because the touched induction unit is charged during the detection, small current may be generated in the touched induction unit, and an influence of a level signal Vcom on the self capacitor generated by a touch on an induction unit on the touch screen may be eliminated by the small current. Accordingly, a screen shielding layer and related procedures thereof may be eliminated, thus further reducing a cost while enhancing an anti-interference capability.

A portable electronic device according to an embodiment of the present discourse may comprise the touch sensitive device according to the above-mentioned embodiments of the present discourse. A portable electronic device according to an embodiment of the present discourse may comprise the touch detecting assembly according to the above-mentioned embodiments of the present discourse. Other constructions such as a structure, a control and an operation of the portable electronic device according to an embodiment of the present discourse are obvious to those skilled in the art and will not be described in detail here.

Reference throughout this specification to "an embodiment," "some embodiments," "one embodiment", "another example," "an example," "a specific example," or "some examples," means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. Thus, the appearances of the phrases such as "in some embodiments," "in one embodiment", "in an embodiment", "in another example," "in an example," "in a specific example," or "in some examples," in various places throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

Although explanatory embodiments have been shown and described, it would be appreciated by those skilled in the art that changes, alternatives, and modifications may be made in the embodiments without departing from spirit and principles of the disclosure. Such changes, alternatives, and modifications all fall into the scope of the claims and their equivalents.