| JP11296132 | PSEUDOOUTLINE PROCESSING CIRCUIT |
| JP2008122684 | PLASMA DISPLAY DEVICE AND DRIVING METHOD OF DISPLAY PANEL |
| JP2000163004 | HALFTONE DISPLAY METHOD FOR DISPLAY DEVICE |
Han, Jung Gwan (# Woosung Apt. Songnae-dong Sosa-gu Bucheon-shi Kyoungki-do 422-040, 1-1302, KR)
Young, Dae JU. (920-1 Bisan-7-dong Suh-gu Daegu-shi 703-047, KR)
Han, Jung Gwan (# Woosung Apt. Songnae-dong Sosa-gu Bucheon-shi Kyoungki-do 422-040, 1-1302, KR)
| 1. | In a simultaneous double discharge PDP which displays an image signal by forming N x M cells on first and second substrates connected to each other in parallel at regular intervals, the simultaneous double discharge PDP characterized in that the N x M cells include first and second scan electrodes which are aligned in parallel on the first substrate at constant intervals; first and second sustain electrodes which are aligned in parallel between the first and second scan electrodes at constant intervals ; and an address electrode aligned orthogonally to the respective scan electrodes and sustain electrodes on the second substrate, wherein the first and second scan electrodes are driven by being commonly connected to all the scan electrodes aligned in the cells of the PDP, the first and second sustain electrodes are driven by being commonly connected in the cells, and the discharge operation is simultaneously performed between the first scan electrode and the first sustain electrode, and between the second scan electrode and the second sustain electrode. |
| 2. | The simultaneous double discharge PDP of claim 1, wherein the respective scan electrode and the respective sustain electrode include transparent electrodes of ITO formed on the first substrate and bus electrodes of metal formed on the transparent electrodes. |
| 3. | The simultaneous double discharge PDP of claim 1, wherein the respective scan electrode and the respective sustain electrode include only bus electrodes of metal formed on the first substrate. |
| 4. | The simultaneous double discharge PDP of claim 1, wherein the respective scan electrode includes transparent electrodes of ITO formed on the first substrate and bus electrodes of metal formed on the transparent electrodes, and the respective sustain electrode includes only bus electrodes of metal formed on the first substrate. |
| 5. | The simultaneous double discharge PDP of any one of claims 1 to 4, wherein the respective sustain electrodes have the same width which is narrower than that of the respective scan electrodes. |
| 6. | In a simultaneous double discharge PDP which displays an image signal by forming N x M cells on first and second substrates connected to each other in parallel at constant intervals, the simultaneous double discharge PDP characterized in that the N x M cells include first and second scan electrodes which are aligned in parallel on the first substrate at constant intervals ; and a sustain electrode which is aligned orthogonally to the respective scan electrodes on the second substrate, wherein the respective scan electrodes are driven by being commonly connected to all the scan electrodes in the cells of the PDP, the sustain electrode addresses a pair of the first and second scan electrodes included in each cell so that the discharge operation is simultaneously performed between the first scan electrode and the second scan electrode in each cell. |
| 7. | The simultaneous double discharge PDP of claim 6, wherein the respective scan electrode includes transparent electrodes of ITO formed on the first substrate and bus electrodes of metal formed on the transparent electrodes. |
| 8. | The simultaneous double discharge PDP of claim 6, wherein the respective scan electrode includes only bus electrodes of metal formed on the first substrate. |
Discussion of the Related Art Generally, a PDP is a display device which displays characters or graphics using light emitted from a plasma generated during gas discharge. In accordance with types of a driving voltage, the PDP is divided into a direct current type PDP driven by a direct current voltage and an alternating current type PDP driven by a sinusoidal alternating current voltage or a pulse voltage. The alternating current type PDP is divided into an opposing electrode type and an area discharge type in accordance with an electrode structure and a discharge mode. An area discharge alternating current type PDP is widely used in view of technical aspects.
Fig. 1 is a schematic view of a related art alternating current type PDP of a three-electrode area discharge type.
As shown in Fig. 1, scan electrodes 11 (X electrodes) and sustain electrodes 12 (Y electrodes) for scan and sustain discharge are formed on one surface of a glass substrate which is an upper substrate 10 of a display surface. The X electrodes and the Y electrodes respectively include
transparent electrodes lla and 12a of indium-tin oxide (ITO) and bus electrodes llb and 12b of metal.
An address electrode 17 for designating each cell is aligned in a lower substrate 16 opposing the upper substrate 10. A phosphor is deposited on an entire surface of the address electrode 17 to discharge visible rays. The upper substrate 10 and the lower substrate 16 which oppose to each other are sealed, and a discharge gas is injected thereinto.
In this manner, a PDP is completed.
The aforementioned related art three-electrode area discharge alternating current type PDP increases life span of the phosphor material as compared with a two-electrode alternating current type PDP, but is not efficient in view of micro discharge.
In other words, in the aforementioned area discharge alternating current type PDP, the same phase pulse is applied to the same position with an adjacent cell, thereby causing crosstalk due to mutually discharge interference.
Since one light-emission is induced whenever one pulse is applied, light-emission is increased as the number of applying pulses increases.
However, it is difficult to improve discharge efficiency due to a limited element of the driving frequency.
This is because that sustain discharge occurs on one surface in view of driving characteristic of the area discharge alternating current type PDP. Consequently, discharge efficiency of the three-electrode alternating current type PDP is reduced.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a simultaneous double discharge PDP that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide a simultaneous double discharge PDP which improves luminous efficiency and luminance by simultaneously generating discharge in a plurality of pixels within a unit cell.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the scheme particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, in a simultaneous double discharge PDP which displays an image signal by forming N x M cells on first and second substrates connected to each other in parallel at regular intervals, the simultaneous double discharge PDP is characterized in that the N x M cells include first and second scan electrodes which are aligned in parallel on the first substrate at regular intervals; first and second sustain electrodes which are aligned in parallel between the first and second scan electrodes at regular intervals; and an address electrode aligned orthogonally to the respective scan electrodes and sustain electrodes on the second substrate, wherein the first and second scan electrodes are driven through the common
connection to all the scan electrodes aligned in the cells of the PDP, the first and second sustain electrodes are driven through the common connection in the cells, and the discharge operation is simultaneously performed between the first scan electrode and the first sustain electrode, and between the second scan electrode and the second sustain electrode.
In another simultaneous double discharge PDP of the present invention, which displays an image signal by forming N x M cells on first and second substrates connected to each other in parallel at regular intervals, the simultaneous double discharge PDP is characterized in that the N x M cells include first and second scan electrodes which are aligned in parallel on the first substrate at regular intervals; and a sustain electrode which is aligned orthogonally to the respective scan electrodes on the second substrate, wherein the respective scan electrodes are driven through the common connection to all the scan electrodes in the cells of the PDP, the sustain electrode addresses a pair of the first and second scan electrodes included in each cell so that the discharge operation is simultaneously performed between the first scan electrode and the second scan electrode in each cell.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in detail with
reference to the following drawings in which like reference numerals refer to like elements wherein: Fig. 1 is a schematic view showing a related art alternating current type PDP of a three-electrode area discharge ; Fig. 2 is a schematic view illustrating the operation when a simultaneous discharge mode is applied to the related art alternating current type PDP of a three-electrode area discharge of Fig. 1 ; Fig. 3 is a schematic view of an alternating current type PDP of a three-electrode simultaneous double discharge according to the first embodiment of the present invention; Fig. 4 is a schematic view of a PDP of a three- electrode simultaneous double discharge according to the second embodiment of the present invention; Fig. 5 is a schematic view of a PDP of a three- electrode simultaneous double discharge according to the third embodiment of the present invention; Fig. 6 is a schematic view illustrating discharge state of an alternating current type PDP of a three-electrode simultaneous double discharge suggested in Figs. 3 to 5 ; Fig. 7 is a schematic view of a PDP of a three- electrode simultaneous double discharge according to the fourth embodiment of the present invention; Fig. 8 is a schematic view illustrating discharge state of an alternating current type PDP of a three-electrode simultaneous double discharge suggested in Fig. 7 ; Figs. 9a and 9b are graphs illustrating a charge density difference between the PDP of the present invention and the related art PDP; and Figs. 10a and 10b are graphs illustrating an electron
density difference between the PDP of the present invention and the related art PDP.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
In the present invention, it is intended that an alternating current type PDP improves discharge efficiency without varying a driving mode in the related art area discharge alternating current type PDP. In the present invention, a simultaneous double discharge PDP is provided in which two X electrodes in one cell of a three-electrode alternating current type PDP are simultaneously discharged.
For application of the simultaneous double discharge, a new electrode structure is required unlike the related art three-electrode alternating current type PDP. The new electrode structure will be described below.
Fig. 2 is a schematic view illustrating the operation when a simultaneous discharge mode is applied to the related art alternating current type PDP of a three-electrode area discharge of Fig. 1.
To perform simultaneous double discharge of the present invention using a three-electrode alternating current type PDP of Fig. 2, it is necessary to induce simultaneous double discharge for X electrodes 11 and 13 (commonly connected electrodes) at both sides using one Y electrode 12. That is, it is necessary to breakdown two X electrodes 11 and 13 in one cell at the same time.
However, to enable such a simultaneous double discharge,
two X electrodes 11 and 13 should completely be equal to one Y electrode 12 so that charges from the Y electrode 12 are exactly divided into 1/2 to enable symmetrical simultaneous double discharge. Types of applying pulses should completely be equal to allow a plurality of cells in one line to perform the same reaction.
However, for such a simultaneous double discharge, it is actually difficult to breakdown two X electrodes 11 and 13 in one cell at the same time and to perform the same reaction of a plurality of the cells in one line.
Accordingly, in the present invention, for application of simultaneous double discharge, a new three-electrode alternating current type PDP is suggested.
Fig. 3 shows a structure and the operation of an alternating current type PDP of a three-electrode area discharge according to the first embodiment of the present invention. In Fig. 3, an electrode structure of one cell is exemplified.
Referring to Fig. 3, X electrodes 21 and 24 and Y electrodes 22 and 23 for scan and sustain discharge are formed on one surface of an upper substrate 10 in a cell constituting a PDP. At this time, the X electrodes 21 and 24 and the Y electrodes 22 and 23 respectively include ITO electrodes (transparent electrodes) 21a, 22a, 23a, and 24a and bus electrodes 21b, 22b, 23b, and 24b.
The Y electrodes 22 and 23 are aligned in parallel by the same width as the distance between each other and are narrower than the distance of the X electrodes 21 and 24. At this time, since a voltage having the same polarity is simultaneously applied to the Y electrodes 22 and 23, the Y electrodes 22 and 23 are hardly affected by interference
despite the distance between two is small.
The X electrodes 21 and 24 are commonly connected to be simultaneously driven. The Y electrodes 22 and 23 are divided into two within the panel but are commonly connected to a pad or a circuit terminal (FPC) outside the panel so that they are simultaneously driven.
A driving means or circuit for driving the X electrodes 21 and 24 and the Y electrodes 22 and 23 is constituted in the same manner as that of the related art. That is, in the related art three-electrode alternating current type PDP, X electrodes of each line are connected to one common line to be simultaneously driven. Likewise, in the first embodiment of the present invention, the respective X electrodes 21, 24,... are simultaneously driven by one common line. In the first embodiment of the present invention, two Y electrodes 22,23,... in one cell are collected to one so as to be connected with the related art Y electrode driving circuit.
Meanwhile, on a lower substrate 16, an address electrode 17 is formed orthogonally to the X electrodes 21 and 24 and the Y electrodes 22 and 23 in the same manner as the related art. A reference numeral 1 which is not described denotes a dielectric layer and a reference numeral 2 denotes a discharge space.
Consequently, in the first embodiment of the present invention shown in Fig. 3, Y electrode is divided into two electrodes 22 and 23 having the same size and structure in one cell unlike the related art three-electrode alternating current type PDP shown in Fig. 1 to Fig. 2. The two Y electrodes 22 and 23 are commonly connected so that they are simultaneously driven when a voltage is applied thereto.
Thus, discharge occurs between the first X electrode 21 and
the first Y electrode 22 and at the same time discharge occurs between the second Y electrode 23 and the first X electrode 24.
For example, a negative voltage is applied to the respective X electrodes 21 and 24 through a commonly connected driving circuit while a positive voltage is applied to the respective Y electrodes 22 and 23 through a commonly connected driving circuit. In this case, wall charges occur in the first X electrode 21 and the first Y electrode 22, thereby causing discharge. At the same time, discharge also occurs between the second Y electrode 23 and the second X electrode 24. Accordingly, two discharges simultaneously occur in one cell to improve discharge efficiency. This improves whole luminance of the PDP.
Meanwhile, Fig. 4 is a schematic view of a PDP according to the second embodiment of the present invention.
In Fig. 4, an electrode structure of one cell is exemplified.
Referring to Fig. 4, X electrodes 31 and 34 which are scan electrodes are formed at both sides of the upper substrate 10. Y electrodes 32 and 33 which are sustain electrodes are formed between the X electrodes 31 and 34.
The Y electrodes 32 and 33 are aligned in parallel by the same width as the distance between each other and are narrower than the distance of the X electrodes 31 and 34.
Unlike Fig. 3, the X electrodes 31 and 34 and the Y electrodes 32 and 33 are formed using bus electrodes only without using transparent electrodes of ITO. That is, in Fig.
3, to form the respective X electrodes 21 and 24 and the Y electrodes 22 and 24, transparent electrodes 21a, 22a, 23a and 24a of ITO have been formed and then respective bus electrodes 21b, 22b, 23b and 24b have been formed. However,
in Fig. 4, the X electrodes 31 and 34 and the Y electrodes 32 and 33 are formed using respective bus electrodes only without forming the transparent electrodes.
As described above, if the X electrodes 20 and 21 and the Y electrodes 22 and 23 are formed using the bus electrodes only without forming an ITO film, power consumption can be remarkably reduced and operational margin is nearly affected by interference between adjacent cells.
On the other hand, luminous characteristic is reduced, and the presence of the ITO film is determined depending on application fields and the production cost.
The operation of the PDP according to the second embodiment of the present invention will be described with reference to Fig. 4.
First, the respective X electrodes 31 and 34 are commonly connected by one common line and are simultaneously driven in the same manner as the aforementioned first embodiment. The respective Y electrodes 32 and 33 are also simultaneously driven by another common line. In other words, in this embodiment, the respective Y electrodes 32 and 33 are divided into two inside of the panel but are commonly connected to the pad or FPC outside the panel. Accordingly, in the same manner as Fig. 3, a circuit used in the related art three-electrode alternating current type PDP can be used as a means and circuit for driving the respective X electrodes 31 and 34 and the Y electrodes 32 and 33.
Therefore, in the same manner as Fig. 3, a negative voltage is applied to the respective X electrodes 31 and 34 through a commonly connected driving circuit while a positive voltage is applied to the respective Y electrodes 32 and 33 through a commonly connected driving circuit. In
this case, discharge occurs between the first X electrode 31 and the first Y electrode 32. At the same time, discharge also occurs between the second Y electrode 33 and the second X electrode 34. Thus, a three-electrode simultaneous double alternating current type PDP can be obtained.
Fig. 5 is a schematic view of a PDP according to the third embodiment of the present invention, in which another three-electrode simultaneous double discharge alternating current type PDP is suggested.
Referring to Fig. 5, X electrodes 41 and 44 which are scan electrodes are formed at both sides of the upper substrate 10. Y electrodes 42 and 43 which are sustain electrodes are formed between the X electrodes 41 and 44.
The respective X electrodes 41 and 44 include transparent electrodes 41a and 44a of ITO and bus electrodes 41a and 44b of metal. The respective Y electrodes 42 and 33 include bus electrodes only without transparent electrodes. Also, the respective Y electrodes 42 and 43 are aligned in parallel with the same width as the distance between each other and are narrower than the distance between the X electrodes 41 and 44.
In the same manner as the aforementioned embodiments, a negative voltage is applied to the respective X electrodes 41 and 44 through a commonly connected driving circuit while a positive voltage is applied to the respective Y electrodes 42 and 43 through a commonly connected driving circuit. In this case, discharge occurs between the first X electrode 41 and the first Y electrode 42. At the same time, discharge also occurs between the second Y electrode 43 and the second X electrode 44. Thus, simultaneous double discharges occur in one cell.
Meanwhile, Fig. 6 is a schematic view illustrating discharge state of an alternating current type PDP of a three-electrode area discharge suggested in Figs. 3 to 5.
The discharge state of Figs. 3 to 5 will be described below with reference to Fig. 6.
Each of rectangular dotted lines of Fig. 6 indicates one cell. X electrode and Y electrode in each cell are aligned in parallel with each other. The respective X electrodes are commonly connected and simultaneously driven by an applying voltage. In case of the respective Y electrodes, only the Y electrodes in the same cell are simultaneously driven.
As described above, in a state that the X electrodes and the Y electrodes are respectively formed, a negative voltage is applied to the commonly connected X electrodes and at the same time a positive voltage is applied to the respective Y electrodes. In this case, plasma discharge occurs between the respective X electrode and the respective Y electrode. At this time, since two discharge spaces exist in one cell, simultaneous double discharge occurs in the cell.
Meanwhile, Fig. 7 is a schematic view of a PDP according to the fourth embodiment of the present invention.
Referring to Fig. 7, X electrodes 51 and 54 which are scan electrodes are formed on the upper substrate 10 in parallel at regular intervals. Bus electrodes 52 and 53 are formed on a region over the respective X electrodes 51 and 54. Y electrode 55 is formed on the respective X electrodes 51 and 54 orthogonally to the respective X electrodes 51 and 54 at a regular interval from the X electrodes 51 and 54. The respective X electrodes 51 and 54 are narrower than the Y
electrode 55. In Fig. 7, a reference numeral 1 which is not described denotes a dielectric layer and a reference numeral 2 denotes a discharge space.
Unlike Figs. 3 to 5 in which the respective X electrodes and the respective Y electrodes are aligned in parallel, the respective X electrodes 51 and 54 are aligned orthogonally to the Y electrode 55. The respective X electrodes 51 and 54 are divided into two inside of the panel and are commonly connected to one pad or the FPC outside of the panel. The Y electrode acts as an address electrode.
In the embodiment shown in Fig. 7, the respective X electrodes 51 and 54 are formed of transparent electrodes of ITO and then respective bus electrodes 52 and 53 are formed thereon. Alternatively, the X electrodes may be formed using the bus electrodes only, without forming the ITO electrodes.
In this case, the operation of each structure is the same.
Fig. 8 is a schematic view illustrating discharge state of an alternating current type PDP of a three-electrode area discharge suggested in Fig. 7. The discharge state will be described below with reference to Fig. 8.
Each of rectangular dotted lines of Fig. 8 indicates one cell. X electrode and Y electrode in each cell are aligned in orthogonal to each other. For example, if the respective X electrodes (51 and 54 in Fig. 7) are vertically aligned, the Y electrode (55 in Fig. 7) is horizontally aligned. If a negative voltage is applied to the X electrode and a positive voltage is applied to the Y electrode, (-) charges input from a common line connected to the X electrode are divided into half and then supplied to the X electrode. Accordingly, symmetrical simultaneous
double discharges occur between the respective X electrode and the respective Y electrode. As a result, the same simultaneous double discharges as that of the three- electrode alternating current type PDP of Fig. 7 occurs.
Meanwhile, Figs. 9a and 9b are graphs illustrating a charge density difference between the PDP of the present invention and the related art PDP. Fig. 9a shows charge density of the PDP of the present invention, and Fig. 9b shows charge density of the related art PDP.
Figs. 10a and 10b are graphs illustrating an electron density difference between the PDP of the present invention and the related art PDP. Fig. 10a shows electron density of the PDP of the present invention, and Fig. 10b shows electron density of the related art PDP.
As shown in Figs. 9a and 9b and Figs. 10a and lOb, it is noted that the electron density or the charge density occurring in the simultaneous double discharge structure according to the respective embodiments of the present invention is much higher than that of the related art area discharge structure under the same voltage conditions.
Since the density of such particles acts as the source of Xe excited species which generate light, the high density is preferred during discharge. Accordingly, the simultaneous double discharge structure of the present invention obtains higher luminance and higher efficiency than those of the related art area discharge structure. Furthermore, repulsion generated by the two Y electrodes in one cell enhances the density and force of the particles.
As aforementioned, the simultaneous double discharge PDP of the present invention has the following advantages.
Since two discharges simultaneously occur in one pulse
within a unit cell, it is possible to improve discharge efficiency and luminance characteristic of the three- electrode alternating current type PDP. In performing simultaneous double discharge according to the present invention, since the related art driving means can be applied without an additional means, it is possible to improve the price-performance of the product.
The foregoing embodiments are merely exemplary and are not to be construed as limiting the present invention. The present teachings can be readily applied to other types of apparatuses. The description of the present invention is intended to be illustrative, and not to limit the scope of the claims. Many alternatives, modifications, and variations will be apparent to those skilled in the art.
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