Choi, Jeong-sik (218-3 Song Hyun-1dong Dal Seo-Gu Dae Gu-City 704-341, KR)
| 1. | In a color plasma display panel comprising a front substrate 1 and a rear substrate 2, at least multiple electrodes (X electrodes and/or Y electrodes) being formed on the front substrate 1, 5 multiple address electrodes 5 being formed on the rear substrate 2 opposite to the multiple electrodes so as to form multiple display cells (discharge cells) in crossing regions with the multiple electrodes, R, G, B phosphor layers 9 being formed so as to display images by discharges between the multiple electrodes (X 10 electrodes and/or Y electrodes) and the multiple address electrodes 5, and multiple black stripes being formed so as to improve a contrast characteristic of the R, G, B phosphor layers 9, said color plasma display panel being characterized in that said black stripes 13 and 14 additionally include at least one of 15 a group which is consisted of dyes to reveal a blue color, dyes having an NIRblocking function and dyes to absorb an orange color used for improving color purity and color temperature of a red color, thereby improving color temperature and/or brightness. |
| 2. | A color plasma display panel with an improvement of color 20 temperature and brightness according to claim 1, wherein barrier ribs 8 are provided between the front substrate 1 and the rear substrate 2 so as to provide discharge spaces filled with discharge gas, said color plasma display panel being characterized in that at least one portion of said barrier ribs 8 contains at least one of dyes to reveal a blue color, dyes having an NIRblocking function and dyes to absorb an orange color used for improving color purity and color temperature of a red color. |
| 3. | A color plasma display panel with an improvement of color temperature and brightness according to claim 1, wherein barrier ribs 28 are provided between the front substrate 1 and the rear substrate 2 so as to provide discharge spaces filled with discharge gas, said color plasma display panel being characterized in that dye layers 29 containing at least one of dyes to reveal a blue color, dyes having an NIRblocking function and dyes to absorb an orange color used for improving color purity and color temperature of a red color are formed on at least one portion of said barrier ribs 28. |
| 4. | In a color plasma display panel comprising a front substrate 1 and a rear substrate 2, at least multiple electrodes (X electrodes and/or Y electrodes) being formed on the front substrate 1, multiple address electrodes 5 being formed on the rear substrate 2 opposite to the multiple electrodes (X electrodes and/or Y electrodes) so as to form multiple display cells (discharge cells) in crossing regions with the multiple electrodes, R, G, B phosphor layers 9 being formed so as to display images by discharges between the multiple electrodes X and/or Y and the multiple address electrodes 5, and multiple black stripes (3", 4") being formed so as to improve a contrast characteristic of the R, G, B phosphor layers 9, said color plasma display panel being characterized in that filter layers 23 and 24 containing at least one of dyes to reveal a blue color, dyes having an NIRblocking function and dyes to absorb an orange color used for improving color purity and color temperature of a red color are formed on said black stripes 3"and 4". |
| 5. | A color plasma display panel with an improvement of color temperature and brightness according to claim 4, wherein barrier ribs 8 are provided between the front substrate 1 and the rear substrate 2 so as to provide discharge spaces filled with discharge gas, said color plasma display panel being characterized in that at least one portion of said barrier ribs 8 contains at least one of dyes to reveal a blue color, dyes having an NIRblocking function and dyes to absorb an orange color used for improving color purity and color temperature of a red color. |
| 6. | A color plasma display panel with an improvement of color temperature and brightness according to claim 4, wherein barrier ribs 28 are provided between the front substrate 1 and the rear substrate 2 so as to provide discharge spaces filled with discharge gas, said color plasma display panel being characterized in that dye layers 29 containing at least one of dyes to reveal a blue color, dyes having an NIRblocking function and dyes to absorb an orange color used for improving color purity and color temperature of a red color are formed on at least one portion of said barrier ribs 28. |
| 7. | In a color plasma display panel comprising a front substrate 1 and a rear substrate 2, at least multiple electrodes (X electrodes and/or Y electrodes) being formed on the front substrate 1, multiple address electrodes 5 being formed on the rear substrate 2 opposite to the multiple electrodes (X electrodes and/or Y electrodes) so as to form multiple display cells (discharge cells) in crossing regions with the multiple electrodes, R, G, B phosphor layers 9 being formed so as to display images by discharges between the multiple electrodes and the multiple address electrodes 5, and barrier ribs 8 being provided between the front substrate 1 and the rear substrate 2 so as to provide discharge 5 spaces filled with discharge gas, said color plasma display panel being characterized in that at least one portion of said barrier ribs 8 contains at least one of dyes to reveal a blue color, dyes having an NIRblocking function and dyes to absorb an orange color used for improving color purity and color temperature of a red 10 color. |
| 8. | In a color plasma display panel comprising a front substrate 1 and a rear substrate 2, at least multiple electrodes (X electrodes and/or Y electrodes) being formed on the front substrate 1, multiple address electrodes 5 being formed on the rear substrate 2 15 opposite to the multiple electrodes so as to form multiple display cells (discharge cells) in crossing regions with the multiple electrodes, R, G, B phosphor layers 9 being formed so as to display images by discharges between the multiple electrodes and the multiple address electrodes 5, and barrier ribs 28 being 20 provided between the front substrate 1 and the rear substrate 2 so as to provide discharge spaces filled with discharge gas, said color plasma display panel being characterized in that dye layers 29 containing at least one of dyes to reveal a blue color, dyes having an NIRblocking function and dyes to absorb an orange color used for improving color purity and color temperature of a red color are formed on at least one portion of said barrier ribs 28. |
Background Art In general, a plasma display panel is divided into two kinds of an AC-type and a DC-type. In the AC-type plasma display panel, electrodes in discharge spaces within the panel are covered by dielectric layers and discharging charges are rounded on the dielectric layers, thereby being called an alternative current type or an AC type. In driving the AC-type plasma display panel, a screen is continuously radiated by a memory function of the wall charge on the dielectric layers due to display pulses. Meanwhile, in the DC-type plasma display panel, the electrodes within the panel are exposed in the discharging space and discharging charges 5 flow into an exterior circuit through the electrodes. Thus, the plasma display panel of this type is called a direct current type or a DC type and, in driving the DC-type plasma display panel, a memory function of display pulses are performed by floating charges within the discharging space.
10 In conventional AC plasma display panels, there are Known a dual-electrode plasma display panel in which a selection (address) discharge and a sustain discharge are performed between two electrodes, and a triple-electrode plasma display panel in which an address discharge is performed using three electrodes. In a 15 color plasma display panel for multi-step display gradations, phosphors in each cell are excited by an ultraviolet ray radiated by the discharge. But, there is a disadvantage that phospors are very week against impact of positive ions simultaneously generated during the discharge. In the dual-electrode plasma display panel, 20 phosphors are constructed so as to be impinged directly against the ions, thereby being apprehensive of shortening the life of the phosphors. Accordingly, in the color plasma display panel, the triple-electrode plasma display panel using a surface discharge (that is, a surface-discharge type AC plasma display panel) is 5 generally used.
In FIG. 1, a construction of a conventional triple-electrode color plasma display panel is shown as a schematic partial section of one discharge cell or one display cell, and in FIG. 2, a waveform chart for operating it is shown.
10 As shown in FIG. 1, the plasma display panel comprises a front substrate 1, wherein the front substrate 1 is provided with a front electrode group consisting of X electrodes 3 and Y electrodes 4 as transparent electrodes, and a dielectric layer 6 formed thereon. And a rear substrate 2 faced parallel to the front 15 substrate 1 is provided with address electrodes 5 as data electrodes, a dielectric layer 7 formed thereon, barrier ribs 8 formed on the rear dielectric layer so as to form a plurality of cells of discharge spaces between the front substrate 1 and the rear substrate 2 and phosphor layers 9 formed between each barrier 20 ribs 5. The X electrodes 3 and the Y electrodes 4 comprise ITO
electrodes so as not to obstruct the light transmission in the front substrate 1, and bus electrodes 3'and 4'as metal electrodes of a narrower width than the ITO electrodes so as to prevent a voltage drop. And, the phosphor layers 9 of R, G and B form display cells as to each of the R, G, B phosphors with shapes of stripes or delta, etc., and, as shown in Fig. 1, black stripes 3"and 4"are provided on the front substrate 1 in order to improve the contrast of the R, G and B in color.
In a driving method of such a plasma display panel, there are two kinds, i. e., a separate address/sustain discharge method (disclosed on the Japanese Patent Laid-open No. H4-1, 951,880) and a multiple-address/sustain discharge method (disclosed on the Japanese Patent No. 2,528,195). However, the separate address/sustain discharge method is mainly adopted, wherein, as shown in Fig. 2, one field (frame) is divided into, for example, a first to an eighth subfields (subframes) and each subframe comprises a reset period, an address period and a sustain period ; each sustain period is set to have a different sustain period ; and then, a gray scale display of an image screen is obtained by combining each subfield of a different sustain period.
During the reset period, wall charges of the dielectric layers 6, etc., are initialized in each subfield, and during the address period after the reset period, selective writing discharges (address discharges) of display data are performed in cells to be selected. Then, during the sustain period, sustain discharges are repeatedly performed so as to display one subfield by repeating display of radiation by the sustain discharge in the selected display cells.
Circuits for the driving method in such a plasma display panel have not been illustrated in view of such circuits being well known within the skill of the prior art. For example, address pulses for address discharges are applied to the address electrodes 5 by an address driver, which is controlled by a control circuit. Each of the Y electrodes 4 is connected to an Y scan driver, which is connected to an Y side of a common driver.
Pulses for address discharges are generated by the scan driver, and sustain pulses, etc., are generated by the Y side of the common driver, those pulses being applied'to the Y electrodes 4 via the Y scan driver. The Y side of the common driver is controlled by a controller for the common driver installed in a
drive and control part of the panel and the Y scan driver is controlled by a controller for the scan driver installed in a drive and control part of the panel. Also, the X electrodes 3 are connected to an X side of the common driver commonly in all display lines of the plasma display panel, the X side of the common driver generating writing pulses, suatain pulses, etc., and being controlled by the common driver controller. Such common driver controller, the scan driver controller and control circuits are controlled by the horizontal synchronizing signal and the vertical synchronizing signal inputted from the outside of the panel to the drive and control part of the panel, display data signals inputted to the display data control part and a clock. In addition, the display data signals inputted according to the clock are stored in a frame memory.
Also, the AC color plasma display panel of a face discharge type explained as an example may comprise a front plate 10 which is attached to the front face of the front substrate 1, being formed of reinforced glass or acryl substrate, etc., provided with coating layer (s) 11 as a functional film, an EMI film, an anti-reflective film, etc., as shown in Fig. 1 so as to improve an
optical characteristic and to prevent EMI, reflection, etc.
SUMMARY OF THE INVENTION However, there is one problem in the phosphor layers 9 that a color temperature becomes lower due to the lower brightness of the blue phosphor among the R, G, B phosphors. Thus, the screen looks reddish or greenish in a white color display, causing difficulty in realizing the true white color.
Further, there are different problems in the front substrate 1 with the above-mentioned front plate 10 that the front plate 10 with the coating layer (s) 11 lowers the transmission rate of the front substrate 1 and the front substrate 1 costs higher due to multiple films. Also, although the coating layer (s) 11 such as a functional film, an EMI film, an anti-reflective film, etc., are directly applied to the front substrate 1, the transmission rate of the front substrate 1 will be lowered similarly. And some separate processes are required and have some effects on the other processes during the manufacturing process of the front substrate 1 and the rear substrate 2. Thus, there is one problem that the direct application is not easy.
Accordingly, in order to the above discussed problems, the
present invention provides a color plasma display panel with an improvement of color temperature and brightness which can improve color temperature of a white color by making the brightness of a blue color higher, and/or which can enable a function for preventing an NIR without a front plate using reinforced glass or acryl substrate etc., and/or which can improve color purity and color temperature of a red color.
To achieve the above-mentioned object, in accordance with one embodiment of the present invention, there is provided a color plasma display panel with an improvement of color temperature and brightness, wherein said color plasma display panel comprises a front substrate and a rear substrate, at least multiple electrodes being formed on the front substrate, multiple address electrodes being formed on the rear substrate opposite to the multiple electrodes so as to form multiple display cells (discharge cells) in crossing regions with the multiple electrodes, R, G, B, phosphor layers being formed so as to display images by discharges between the multiple electrodes and the multiple address electrodes, and multiple black stripes being formed so as to improve a contrast characteristic of the R, G, B phosphor layers, said color plasma display panel being characterized in that said black stripes additionally include at least one selected from a group, which is consisted of dyes to reveal a blue color, dyes having an NIR-blocking function and dyes to absorb an orange color 5 used for improving color purity and color temperature of a red color, thereby improving color temperature and/or brightness, or being characterized in that dye layers containing at least one of dyes to reveal a blue color, dyes having an NIR-blocking function and dyes to absorb an orange color used for improving color purity 10 and color temperature of a red color are formed on said black stripes. Wherein said plasma display panel comprises barrier ribs, it is preferred that at least one portion of said barrier ribs contains at least one of dyes to reveal a blue color, dyes having an NIR-blocking function and dyes to absorb an orange color used 15 for improving color purity and color temperature of a red color, or dye layers containing at least one of dyes to reveal a blue color, dyes having an NIR-blocking function and dyes to absorb an orange color used for improving color purity and color temperature of a red color are formed on at least one portion of said barrier 20 ribs. Also, the present invention may comprise the combination of the above-mentioned constructions.
Brief Description of the Drawings Fig. 1 is a schematic partial section for explaining a construction of a conventional triple-electrode color plasma 5 display panel.
Fig. 2 is a waveform chart for explaining a conventional method of operating the triple-electrode color plasma display panel.
Fig. 3 is a schematic partial section, similar to Fig. 1, 10 in which one embodiment of the present invention is applied to a triple-electrode color plasma display panel.
Fig. 4 is a schematic partial section, similar to Fig. 1, in which another embodiment of the present invention is applied to a triple-electrode color plasma display panel.
15 Fig. 5 is a schematic partial section, similar to Fig. 1, in which further another embodiment of the present invention is applied to a triple-electrode color plasma display panel.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Now, preferred embodiments of the present invention will be 20 described in detail with reference to the accompanying drawings hereinafter.
In Fig. 3, a schematic partial section is shown in which one embodiment of the present invention is applied to a triple-electrode color plasma display panel.
5 In Fig. 3, a color plasma display panel in accordance with one embodiment of the present invention is constructed similarly to the conventional construction. That is, X electrodes 3, Y electrodes 4 and black stripes 3"and 4"are formed on a front substrate 1, a dielectric layer 6 being formed thereon. Also, 10 address electrodes 5 is formed on a rear substrate 2 opposite to the front substrate 1 and a dielectric layer 7 is formed thereon.
Barrier ribs 8 are formed on the dielectric layer 7 so as to form a plurality of cells of discharge spaces between the front substrate 1 and the rear substrate 2, and R, G, B phosphor layers 15 9 are formed between each barrier ribs 8. Further, the X electrodes 3 and the Y electrodes 4 comprise ITO electrodes so as not to obstruct the light transmission in the front substrate 1, and bus electrodes 3'and 4'as metal electrodes of a narrower width than the ITO electrodes so as to prevent a voltage drop.
20 In Fig. 3, black stripes 13 and 14 are formed on the front
substrate 1 in one shape of a stripe or a matrix, etc., in accordance with the prior art with a mixture of the prior black stripe material and at least one of dyes to reveal a blue color, dyes having an NIR-blocking function and dyes to absorb an orange color used for improving color purity and color temperature of a red color.
By adding dyes to reveal a blue color to the black stripes 13 and 14 as stated above, brightness of B phosphor having the lowest brightness among R, G, B phosphors is compensated when the plasma display panel is radiated due to the discharge, thus it is prevented that the screen looks reddish or greenish in a white color display in the prior art, and therefore, it becomes possible to realize a true white color. Accordingly, an improvement of color temperature can be obtained.
Furthermore, by adding dyes having an NIR-blocking function and/or dyes to absorb an orange color used for improving color purity and color temperature of a red color to the black stripe forming material, and then forming the black stripes 13 and 14 with the dye-added material, the NIR-blocking function can be obtained, and color purity and color temperature of a red color
can be improved, by means of the addition at the lower manufacturing cost without the above-mentioned front plate 10 shown in Fig. 1. Also, large improvement of brightness can be obtained because there is no front plate 10 and films are not formed in the direction of the central reflection in display cells. Furthermore, by forming films of an EMI function or an anti-reflection function on the front substrate 1 within a field of vision, all functions of the prior art front plate 10 comprising an EMI function or an anti-reflection function can be ultimately obtained although the prior art front plate 10 is removed.
In Fig. 4, a schematic partial section is shown in which another embodiment of the present invention is applied to a triple-electrode color plasma display panel.
The structure in Fig. 4 is almost the same as in Fig. 3.
The difference is that, in Fig. 4, filter layers or dye layers 23 and 24 are formed on said black stripes 3"and 4", said filter layers or dye layers 23 and 24 containing at least one of dyes to reveal a blue color, dyes having an NIR-blocking function and dyes to absorb an orange color used for improving color purity and
color temperature of a red color.
In such a construction, the black stripes 3"and 4"are formed as in the conventional construction, and the dye layers 23 and 24 are separately formed on the black stripes 3"and 4", thus the similar effects along with the lower manufacturing cost can be obtained in the similar manner to that in the above-mentioned black stripes 13 and 14 to contain dyes in Fig. 3. That is, by forming the dye layers of a blue color as stated above, brightness of B phosphor having the lowest brightness among R, G, B phosphors is compensated when the plasma display panel is radiated due to the discharge. Thus it is prevented that the screen looks reddish or greenish in a white color display as in the prior art, and therefore, it becomes possible to realize the true white color.
Accordingly, an improvement of color temperature can be obtained.
Furthermore, where dyes for an NIR-blocking function is contained, the NIR-blocking function can be obtained, and where dyes to absorb an orange color used for improving color purity and color temperature of a red color, color purity and color temperature of a red color can be improved. Also, brightness can be largely improved because there is no front plate 10 and films
are not formed in the direction of the central reflection in display cells. Furthermore, by forming films of an EMI function or an anti-reflection function on the front substrate 1 within a field of vision, all functions of the prior art front plate 10 comprising an EMI function or an anti-reflection function can be ultimately obtained although the prior art front plate 10 is removed, as stated in the above-mentioned embodiment.
Meanwhile, even in this case, i. e., even where dye layers 23 and 24 are formed, as not shown, the black stripes 3"and 4" can be formed of a light-absorbing material as the prior black stripe material which additionally includes at least one of dyes to reveal a blue color, dyes having an NIR-blocking function and dyes to absorb an orange color used for improving color purity and color temperature of a red color, as stated above. Thus, this construction can create still more effects.
In Fig. 5, a schematic partial section is shown in which still another embodiment of the present invention is applied to a the triple-electrode AC color plasma display panel of a face discharge type.
In Fig. 5, dye layers 29 are formed on at least one portion of an exterior surface in said barrier ribs 28, said dye layers 29 also containing at least one of dyes to reveal a blue color, dyes having an NIR-blocking function and dyes to absorb an orange color used for improving color purity and color temperature of a red 5 color.
By forming the dye layers 29 on the exterior surface of the barrier ribs 28 as above, it can be prevented that a white color display looks reddish or greenish in the prior art, the NIR-blocking function can be obtained, and/or color purity and 10 color temperature of a red color can be improved. Also, brightness can be largely improved because there is no front plate 10 and films are not formed in the direction of the central reflection in display cells, similarly to the effect in the above-mentioned embodiments.
15 Where the barrier ribs are formed in a dual structure comprising black barrier ribs, the dye layers 29 can be formed instead of the black barrier ribs.
Also, as in the above-mentioned construction wherein black stripes 13 and 14 additionally contain at least one of dyes to 20 reveal a blue color, dyes having an NIR-blocking function and dyes to absorb an orange color used for improving color purity and color temperature of a red color, barrier ribs 8 can be formed so as to additionally contain at least one of dyes to reveal a blue color, dyes having an NIR-blocking function and dyes to absorb an 5 orange color used for improving color purity and color temperature of a red color.
Furthermore, it is possible to be constructed in combination of the above-mentioned constructions, thereby being expected to result in still larger effects.
10 In the above embodiments, the principles of the present invention have been illustrated and explained with particular regard to the structures applied to the triple electrode type, but the present invention can be also applied to a dual-electrode type, or it makes no difference to apply the present invention to 15 an AC type and a DC type in a color plasma display panel.
In addition, the term of stripes in the above-mentioned black stripes 13 and 14 may be replaced by a matrix without any limitation to the stripe structure as a meaning of what is simply formed with a light-absorbing material.
20 According to the construction and its acting effect of the color plasma display panel with an improvement of color temperature and brightness in the above preferred embodiments of the present invention, it can be prevented that, in the prior art, the screen looks reddish or greenish in a white color display, the 5 NIR-blocking function can be obtained, and/or color purity and color temperature of a red color can be improved by additionally containing in black stripes or barrier ribs, and/or forming dye layers with, at least one of dyes to reveal a blue color, dyes having an NIR-blocking function and dyes to absorb an orange color 10 used for improving color purity and color temperature of a red color. Also, brightness can be largely improved because there is no front plate 10 and films are not formed in the direction of the central reflection in display cells, and the present invention also has other undescribed effects.