KR20010010900A - Plasma display panel - Google Patents

Abstract

PURPOSE: A PDP(plasma display panel) is provided to increase brightness and efficiency in light emission higher than a former PDP and to enhance white definition by adjusting a brightness ratio between each discharge cell to the same degree. CONSTITUTION: A first partition wall(210) is formed on a panel with a specific interval. Plural sustain electrodes are formed to be orthogonal to the first partition wall. Each pair of the sustain electrodes(131-131',132-132') is used as discharge cells on each area of the first partition wall. A PDP includes an additional dielectric layer(110) and protective film(120) on each holding electrode consisting of transparent electrodes(132,132) and metal electrodes(131',132') preferably. Second partition walls(221-223) are parallel to the sustain electrodes and formed between the first/second sustain electrodes respectively. The second partition walls have RGB discharge cells having different widths. Therefore, each discharge cell has different RGB areas by the second partition walls.

Description

Plasma Display Panel

The present invention relates to a plasma display panel.

Plasma display panels and liquid crystal displays (LCDs) are spotlighted as next generation display devices with the highest practicality among flat panel display devices. In particular, the plasma display panel has a higher luminance and wider viewing angle than a liquid crystal display device, and thus has wide applicability as a large, thin display such as an outdoor advertising tower, a wall display TV, or a theater display.

In the typical three-electrode surface discharge plasma display panel, as shown in FIG. 1A, the upper substrate 10 and the lower substrate 20 installed to face each other are bonded to each other. FIG. 1B illustrates a cross-sectional structure of the plasma display panel illustrated in FIG. 1A, and the lower substrate 20 is rotated by 90 ° for convenience of description.

The upper substrate 10 is a dielectric layer for coating the scan electrodes 16 and 16 'and the sustain electrodes 17 and 17' formed in parallel with each other, and the scan electrodes 16 and 16 'and the sustain electrodes 17 and 17'. And a protective film 12, wherein the lower substrate 20 is formed between the address electrode 22 and the dielectric film 21 formed on the entire surface of the substrate including the address electrode 22, and the address electrode 22. As shown in FIG. A partition 23 formed on the dielectric film 21 of the dielectric film 21, and a phosphor 23 formed on the surface of the partition wall 23 and the dielectric film 21 in each discharge cell. The upper substrate 10 and the lower substrate 20 The space between) is filled with an inert gas such as helium (He), xenon (Xe), etc. at a pressure of about 400 to 500 Torr to form a discharge region.

The scan electrodes 16 and 16 'and the sustain electrodes 17 and 17' are made of transparent electrodes 16 and 17 and a metal bus as shown in FIGS. 2A and 2B to increase light transmittance of each discharge cell. It consists of electrodes 16 'and 17'. FIG. 2A is a plan view of the sustain electrodes 17 and 17 'and the scan electrodes 16 and 16', and FIG. 2B is a sectional view of the sustain electrodes 17 and 17 'and the scan electrodes 16 and 16'. The bus electrodes 16 'and 17' receive a discharge voltage from an external driving IC, and the transparent electrodes 16 and 17 receive a discharge voltage applied to the bus electrodes 16 'and 17' and are adjacent to each other. It causes discharge between (16, 17). The overall width of the transparent electrodes 16 and 17 is about 300 micrometers (µm) indium oxide or tin oxide, and the bus electrodes 16 'and 17' are made of chromium (Cr) -copper (Cu) -chromium. It consists of three thin films comprised of (Cr). At this time, the width of the bus electrode 16 ', 17' lines is set to approximately one third the width of the transparent electrode 16, 17 line.

The operation of the three-electrode surface discharge type AC plasma display panel is the same as that shown in FIGS. 3A to 3D.

First, when a driving voltage is applied between the address electrode and the scan electrode, a counter discharge occurs between the address electrode and the scan electrode as shown in FIG. 3A, and the ions ionized in the inert gas in the discharge cell or quasi-excitation are caused by the counter discharge. Some of the atoms in the state impinge on the protective layer surface as shown in FIG. 3B. Due to the collision of electrons, electrons are secondarily emitted from the surface of the protective layer. The secondary electrons collide with the gas in the plasma state to diffuse the discharge. After the opposite discharge between the address electrode and the scan electrode is finished, opposite charge wall charges are generated on the surface of the protective layer on each address electrode and the scan electrode as shown in FIG. 3C.

When the discharge voltages having opposite polarities are continuously applied to the scan electrode and the sustain electrode, and the driving voltage applied to the address electrode is blocked at the same time, the potential difference between the scan electrode and the sustain electrode as shown in FIG. Surface discharge occurs in the discharge region on the surface of the dielectric layer and the protective layer. Due to the opposite discharge and the surface discharge, electrons present in the discharge cell collide with the inert gas inside the discharge cell. As a result, ultraviolet rays having a wavelength of 147 nm are generated in the discharge cells while the inert gas of the discharge cells is excited. The ultraviolet rays collide with the phosphor surrounding the address electrode and the partition wall to operate the plasma display panel.

At this time, the luminance of the plasma display is proportional to the discharge current flowing between the scan electrode and the sustain electrode. Therefore, when the discharge current is large, the screen of the plasma display panel becomes bright. In addition, as the distance between the scan electrode and the sustain electrode increases, the brightness of the discharge cell is improved. This is because the discharge distance between the electrodes is increased to generate ultraviolet rays in the positive column.

In addition, a color of a white color screen implemented by a plasma display panel is determined by a luminance ratio between a red discharge cell, a green discharge cell, and a blue discharge cell. At this time, the image quality of the white screen is realistically felt as the color temperature is higher.

The luminance ratio of the phosphor formed in the discharge cells of a plasma display panel generally used has a value of about 2: 3: 1 in the order of red, green, and blue. Therefore, when all the discharge cells are discharged to show white, pure white does not appear well. And the color temperature at this time is about 5000 degree | times.

However, in general, the plasma display panel has a low luminance as compared to a discharge tube such as a fluorescent lamp or a neon lamp, and thus is often insufficient as a next-generation display device to replace the CRT. The reason is that the discharge cells provided in the plasma display panel have a shorter distance between the electrodes for discharging than the discharge tubes such as fluorescent lamps or neon lamps and thus cannot use ultraviolet light in the positive light emitting region having good luminous efficiency.

In addition, the conventional plasma display panel has a problem in that the image quality of the white color is not good because the luminance ratio between the discharge cell in which the red phosphor is formed, the discharge cell in which the blue phosphor is formed, and the discharge cell in which the green phosphor is formed are different. That is, since the luminance of the green phosphor is higher than that of the red phosphor and the luminance of the blue phosphor is lower than that of the red phosphor, the purity of the white phosphor is lowered.

The present invention is to solve the above problems, and has a higher luminous brightness and luminous efficiency than the conventional plasma display panel, and to provide a plasma display panel with improved white image quality by adjusting the luminance ratio between each discharge cell to the same level Has its purpose.

1A is a perspective view illustrating a structure of a general plasma display panel.

1B is a cross-sectional view showing the structure of the plasma display panel shown in FIG. 1A.

Figure 2a is a plan view showing the structure of the sustain electrode provided on the upper substrate.

Figure 2b is a cross-sectional view showing the structure of the sustain electrode provided on the upper substrate.

3A to 3D show the operation of the discharge cells in the write discharge section.

4 is a perspective view schematically showing the structure of a plasma display panel according to the present invention;

5 is a plan view of the plasma display panel illustrated in FIG. 4.

Symbol description for main parts of drawing

100: upper substrate 110: dielectric layer

120: protective film 131, 132: transparent electrode of the sustain electrode

131 ', 132': metal electrode of sustain electrode 200: lower substrate

210: first partition 221: second 'partition

222: second '' bulkhead 223: second '' bulkhead

A1, A2, A3, A4, A5, A6, A7, A8, A9 ...: address electrode

Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, Y9 ...: first sustain electrode

Z1, Z2, Z3, Z4, Z5, Z6, Z7, Z8, Z9 ...: second sustain electrode

R: discharge cell to implement red G: discharge cell to implement green

B: discharge cell to realize blue color

The present invention is characterized in that a part of the lattice-shaped partition walls provided in the plasma display panel are formed to have different thicknesses for each discharge cell in which different phosphors are formed.

According to an embodiment of the present invention, a plasma display panel includes a plurality of first barrier ribs continuously formed at regular intervals on a substrate and a plurality of pairs of sustain electrodes formed to be orthogonal to the first barrier ribs to form discharge cells in an area between the first barrier ribs. And a second barrier rib having a different width between the discharge cells for implementing red, the discharge cells for implementing green, and the discharge cells for implementing blue between the sustain electrodes. 4 is a perspective view schematically showing a plasma display panel of the present invention, Figure 5 is a plan view.

The first partition wall 210 is continuously formed at a predetermined interval on a predetermined substrate as is generally installed in a well known plasma display panel. The first partition wall 210 is generally installed on the lower substrate 200, but may be installed on the upper substrate 100 as necessary.

The sustain electrode is formed continuously so as to be perpendicular to the first partition wall 210. The sustain electrodes are paired with the first sustain electrodes 131 and 131 ′ and the second sustain electrodes 132 and 132 ′ to form discharge cells having a predetermined width in the region between the first partition walls 210. . In this case, the plasma display panel according to the present invention may further include a dielectric layer 110 and a passivation layer 120 on the sustain electrode as in the related art. Each sustain electrode may be composed of transparent electrodes 131 and 132 and metal electrodes 131 'and 132'.

The second partition walls 221, 222, and 223 are formed to be parallel to the sustain electrodes, and are formed between the first sustain electrodes 131 and 131 ′ and the second sustain electrodes 132 and 132 ′. In particular, the second barrier ribs 221, 222, and 223 have different widths among the discharge cells for implementing red, discharge cells for green, and discharge cells for blue. As a result, due to the second partition walls 221, 222, and 223, the area of the discharge cells is different for each discharge cell for red, discharge cell for green, and discharge cell for blue.

The second partitions 221, 222, and 223 may have a second width 221 formed in a discharge cell to realize a red width, and a width wider than a second partition 221 in a discharge cell to implement green color. The second ″ partition 222 and a second ″ partition 223 formed in a narrower width than the second ″ partition 222 in the discharge cell to implement blue. At this time, the width of the second '' partition 222 has a range of 1.1 to 2 times the width of the second 'partition 221, the width of the second' '' partition 223 is the second 'partition ( 221 to have a range of 0.5 to 0.9 times the width.

In the plasma display panel according to the present invention, the second partitions 221, 222, and 223 provided in a direction parallel to the sustain electrode are configured to have a differential width depending on the phosphor of the discharge cell, thereby maintaining a color temperature of about 8000 degrees or more. As a result, the purity of the white can be higher than before.

That is, since the area of the discharge cells to implement green is the narrowest and the area of the discharge cells to implement blue is the largest, the luminance ratio of green to red is slightly lowered and the luminance ratio of blue to red is slightly increased. As a result, the luminance imbalance between green and blue, which has been a problem of the conventional plasma display panel, is solved and the white purity is increased.

Compared to the conventional plasma display panel, the plasma display panel according to the present invention has the effect of eliminating the luminance imbalance between the discharge cell implementing the red color, the discharge cell implementing the green color, and the discharge cell implementing the blue color. That is, the plasma display panel of the present invention has the effect that the luminance difference between red, green, and blue is eliminated, so that the purity of white is higher than that of the conventional plasma display panel.

Claims (4)

A plurality of first partition walls continuously formed at a predetermined interval on a predetermined substrate; A plurality of pairs of sustain electrodes formed to be continuous to orthogonal to the first partition wall to form a discharge cell between the first partition walls, and A plasma display including a second barrier rib that is parallel to the sustain electrode between the pair of sustain electrodes, and has a discharge cell for implementing red, a discharge cell for implementing green, and a second partition wall having a different width for each discharge cell for implementing blue; panel. The method of claim 1, wherein the second partition wall A second 'partition wall having a predetermined width in a discharge cell to implement the red color; A second '' barrier rib having a width wider than the second 'barrier rib in the discharge cell to realize green; and And a second 2 '″ barrier rib formed in a discharge cell to realize the blue color, the second cell having a narrower width than the second barrier rib. The width of the second '' partition wall is Plasma display panel, characterized in that 1.1 to 2 times the range of the second 'partition wall. The width of the second '' 'bulkhead is Plasma display panel, characterized in that the range of 0.5 to 0.9 times the second 'partition wall.