KR20060121397A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to prevent decrease of panel luminance and to improve contrast by using a black partition wall in a predetermined cell among discharge cells. A rear substrate(10) and a front substrate(20) are arranged to be separated from each other in a predetermined interval. A display electrode(21) and an address electrode(11) are arranged between the rear substrate and the front substrate in a cross direction. The display electrode includes a bus electrode(22). A dielectric(23) is formed on the front substrate to cover the display electrode. A dielectric(12) is formed on the rear substrate to cover the address electrode. An MgO protective layer(24) is formed on the dielectric to protect a dielectric on the front substrate from a sputtering of ions and a low driving voltage and to sustain a voltage of discharge plasma. Plural discharge cells(15R,15G,15B) are divided in a space between the both substrates by a partition wall(13). A phosphor is applied in the respective discharge cells to from a phosphor layer(14).

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

1 is an exploded perspective view of a plasma display panel according to an embodiment of the present invention.

2 is a partial plan view of a plasma display panel according to an embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel which simultaneously improves high brightness and bright room contrast.

In general, a plasma display panel (PDP) is a display device that displays an image using visible light generated by a vacuum ultraviolet (VUV) emitted from a plasma obtained through gas discharge by exciting a phosphor. Such a plasma display panel can realize a large screen of 60 inches or more with a thickness of only 10 cm or less, and is a self-luminous display device such as a CRT, and thus has excellent color reproduction and no distortion due to a viewing angle. In addition, the manufacturing method is simpler than LCD, and thus has advantages in terms of productivity and cost.

The structure of the plasma display panel has been developed for a long time since the 1970s, and the structure generally known is a three-electrode surface discharge type structure. A typical three-electrode surface discharge type structure consists of two substrates on the same surface, that is, one substrate including a scan electrode and a sustain electrode and another substrate including address electrodes vertically spaced apart from the substrate by a predetermined distance therefrom. The substrate includes a dielectric layer covering the electrodes, a partition wall partitioning a discharge cell, and a phosphor layer emitting light of any one of red (R), green (G), and blue (B) colors. In addition, a discharge gas (mainly Ne-Xe mixed gas) for gas discharge is filled in the discharge cell. In such a plasma display panel, when an address voltage is applied to an address electrode and a scan pulse is applied to the scan electrode, an address discharge occurs in a discharge cell where the scan electrode and the address electrode intersect. Wall charges are formed and accumulated on the covering front and back dielectric layers to select discharge cells for emitting light.

Subsequently, when the discharge sustain voltage is applied to the scan electrode and the sustain electrode of the selected discharge cell, the ions accumulated in the front dielectric layer on the scan electrode side and the electrons accumulated in the front dielectric layer on the sustain electrode side collide with each other to generate gas discharge, that is, sustain discharge. Cause The vacuum ultraviolet rays are radiated by the transition from the resonance level of the Xe excitation atom to the base level produced by this gas discharge, and the visible light is generated by the excitation light emission phenomenon of the phosphor by the vacuum ultraviolet rays to display an image.

The plasma display panel has a disadvantage in that the luminance is slightly lower than that of other display apparatuses. Thus, the color of the partition wall partitioning the discharge cells may be white, thereby increasing the luminance. However, the problem of contrast can be considered in conjunction with the luminance, but the luminance of the panel can be increased by the color of the partition wall being white, but the external light reflection luminance of the panel is high, which has disadvantageous disadvantages in the clear room contrast.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a plasma display panel which can improve the clear room contrast by reducing the external light reflection luminance while maintaining the high brightness of the plasma display panel.

In order to achieve the above object, a plasma display panel according to an embodiment of the present invention includes a front substrate and a rear substrate disposed to face each other, a first electrode extending in a direction crossing each other between the front substrate and the rear substrate and the first substrate; Two electrodes, a partition wall disposed between the front substrate and the rear substrate to partition a plurality of discharge cells, and a phosphor layer emitting light of any one of red, blue, and green colors in each of the discharge cells; Among the discharge cells, the partition wall of the discharge cell in which at least one of red, blue, and green colors are emitted may be colored with a lower brightness than the color of the partition walls of the remaining discharge cells.

In addition, the partition walls of the discharge cells in which green light is emitted from among the discharge cells may be colored with a lower brightness than the colors of the partition walls of the remaining discharge cells.

In addition, the partition wall is colored in a low color may be colored in black.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view of a plasma display panel according to an embodiment of the present invention.

As shown in FIG. 1, in the plasma display panel according to the present exemplary embodiment, the rear substrate 10 and the front substrate 20 are spaced apart from each other at a predetermined interval, and the rear substrate 10 and the front substrate ( The display electrode 21 and the address electrode 11 are disposed in a direction crossing each other, and the display electrode 21 includes a bus electrode 22 for supplementing conductivity. The display electrode 21 is divided into a scan electrode and a sustain electrode according to a role thereof, and the scan electrode serves to scan a discharge cell selected while voltage is sequentially applied during the scan period, and the sustain electrode is after the scan period. It plays a role of causing sustain discharge between the scan electrodes during the discharge sustain period.

In addition, a dielectric layer 23 is formed on the front substrate 20 while covering the display electrode 21, and a dielectric layer 12 is formed on the rear substrate while covering the address electrode 11. An MgO protective film 24 is formed on the dielectric layer 23 to protect the dielectric layer 23 on the front substrate 20 from sputtering of ions and to lower the driving and holding voltage of the discharge plasma.

Meanwhile, a plurality of discharge cells 15R, 15G, and 15B are partitioned by the partition wall 13 so as to cause gas discharge in the space between the substrates 10 and 20, and the discharge cells 15R, 15G, and 15B. Phosphor is coated in the inside to form the phosphor layer 14.

The partition wall 13 includes a first partition member 13a formed along a direction parallel to the address electrode 12 (y-axis direction in the drawing), and a direction crossing the first partition member 13a (x-axis in the drawing). Direction) includes a second partition wall member 13b. Such a barrier rib structure is not limited to the above-described structure, and various barrier rib structures such as a stripe-type barrier rib structure made of only a barrier member in parallel with the address electrode can be applied to the present invention, which is also within the scope of the present invention.

2 is a partial plan view of a plasma display panel according to an exemplary embodiment of the present invention.

As shown in FIG. 2, in the present embodiment, the color of the partition wall 13 of the discharge cell 15G where green is emitted among the discharge cells 15R, 15G, and 15B is black. When the barrier ribs of the discharge cells are all white, light emitted from the discharge cells is reflected to increase brightness, but contrast may be inhibited due to external light reflection. In order to solve this problem, it is possible to consider a method of making all of the color of the partition wall black, but when the color of the partition wall is all black, the luminance of the entire plasma display panel may be reduced.

Accordingly, the color of the partition wall of the specific cell among the discharge cells 15R, 15G, and 15B may be blackened, thereby reducing the external light reflection luminance while improving the bright room contrast while preventing the reduction of the overall luminance of the plasma display panel. That is, among the discharge cells, at least one of red, blue, and green colors is discharged, the partition of the discharge cell is black, and the partitions of the remaining discharge cells are white, so that the brightness is kept equal and the contrast is improved. Can be. Preferably, considering the visibility characteristics according to the wavelength of the human eye, since the luminance of green among the red, green, and blue light emitted is the highest, the color of the partition wall 13 of the discharge cell 15G in which the green light is emitted is black. You can do

In addition, as in the present embodiment, it is preferable to form the color of the partition 13 of the discharge cell 15G emitting green light as the lowest black color, but the color is lower than the color of the partition wall of the remaining discharge cells even if not black. Can be colored, which also belongs to the scope of the present invention.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications or changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

Through the plasma display panel according to the present invention, the luminance reduction of the entire plasma display panel can be minimized while the external light reflection luminance can be reduced, and the contrast of the clear cell can be improved. It can have an increased effect.

Claims (3)

A front substrate and a back substrate disposed to face each other; First and second electrodes extending in a direction crossing each other between the front substrate and the rear substrate; Barrier ribs disposed between the front substrate and the rear substrate to partition a plurality of discharge cells; And A phosphor layer emitting light in any one of red, blue, and green colors in each of the discharge cells, Among the discharge cells, at least one of the red, blue, and green of the discharge cells, the partition wall of the discharge cell is colored with a lower brightness than the color of the partition walls of the remaining discharge cells. The method of claim 1, Among the discharge cells, the partition wall of the discharge cell in which green light is emitted is colored in a color having a lower brightness than the color of the partition walls of the remaining discharge cells. The method according to claim 1 or 2, And a partition wall colored with the low brightness color is colored black.

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