KR100521488B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel having a substrate structure for suppressing reflection of external light to improve contrast of a screen.

First and second substrates disposed to face each other; Discharge sustaining electrodes and address electrodes provided on the first and second substrates, respectively; A partition wall disposed in a space between the first and second substrates to form discharge cells and non-discharge regions; A fluorescent layer formed in each discharge cell; It provides a plasma display panel including an external light absorbing portion formed at a position corresponding to the non-discharge regions outside the first substrate, wherein the non-discharge region is disposed in an area surrounded by a horizontal axis and a vertical axis passing through the center of each discharge cell.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having a substrate structure for suppressing external light reflection to improve contrast of a screen.

In general, a plasma display panel (PDP) is a display device that realizes an arbitrary image by exciting phosphors by vacuum ultraviolet rays caused by gas discharge occurring in a discharge cell. This makes it possible to attract attention as the next generation of thin display devices.

5 is a partially exploded perspective view of the PDP according to the prior art, and FIG. 6 is a cross-sectional view in the Y direction of the front substrate shown in FIG. 5.

Referring to the drawings, in the conventional PDP, address electrodes 3 are formed along one direction (Y direction in the drawing) on the rear substrate 1, and cover the address electrodes 3 to cover the rear substrate 1. The dielectric layer 5 is formed on the front side. A stripe-shaped partition wall 7 is formed between the address electrodes 3 on the dielectric layer 5, and red (R), green (G), and blue (B) fluorescence are formed between the partition walls 7. Layer 9 is located.

One surface of the front substrate 11 facing the rear substrate 1 includes a pair of transparent electrodes 13a and a bus electrode 13b along a direction orthogonal to the address electrode 3 (the X direction in the drawing). Discharge sustaining electrodes 13 are formed, and the transparent dielectric layer 15 and the MgO passivation layer 17 are disposed on the entire front substrate 11 while covering the discharge sustaining electrodes 13. As a result, the intersection of the address electrode 3 and the discharge sustaining electrode 13 constitutes a discharge cell, and the discharge cells are filled with discharge gas.

With the above-described configuration, address discharge is applied by applying the address voltage Va between the address electrode 3 and any one of the discharge sustaining electrodes 13, and again, the sustain voltage (between the pair of discharge sustaining electrodes 13) is maintained. When Vs) is applied, vacuum ultraviolet rays generated during sustain discharge excite the fluorescent layer 9 to emit visible light through the transparent front substrate 11.

In the conventional PDP operating as described above, as the front substrate 11 is made of a transparent glass material, external light reflection is inevitably caused. External light reflection occurs when light generated outside the PDP reaches the discharge cells through the front substrate 11 and is reflected on the surface of the fluorescent layer 9 or the dielectric layer 5 and when reflected outside the front substrate 11. It can be explained by dividing by.

First, when external light reaches the discharge cell and is reflected from the surface of the fluorescent layer 9 or the dielectric layer 5, the brightness of the black display is high, so that the dark room contrast of the screen is lowered. When the external light is reflected from the outside of the front substrate 11, a part of the screen is hidden and not visible due to the external light reflection, which causes a problem that the clear room contrast of the screen is lowered.

Therefore, in the conventional PDP, a black blocking film 19 is formed between the discharge sustaining electrodes 13 to block external light incident through the front substrate 11. Conventional techniques related to the blocking film 19 include plasma display panels disclosed in Japanese Patent Laid-Open Nos. 2003-100222 and 2003-132796, plasma display devices disclosed in Japanese Laid-Open Patent Publication No. 2003-068215, and A manufacturing method is mentioned.

However, in the configuration in which the black blocking film 19 is located inside the PDP as described above, the blocking film 19 is disposed adjacent to the discharge cell, so that the light blocking material constituting the blocking film 19 is applied to the discharge mechanism of the discharge cell. There is a possibility that abnormal discharge occurs in the discharge cell.

In the above-described configuration, the blocking film 19 is formed and baked after the electrode is formed, or the electrode and the blocking film 19 are formed at the same time to complete the blocking film 19. Since equipment and the like are required, it serves as one factor that makes PDP manufacturing difficult.

Furthermore, since the blocking film 19 described above is difficult to expect a blocking effect with respect to the external light reflected from the outside of the front substrate 11 (see arrows in FIG. 6), external light having a strong intensity such as a fluorescent lamp exists outside the PDP. In this case, the external light reflection may not be blocked accordingly. As a result, in the PDP provided with the blocking film 19, it is not possible to solve the problem that part of the screen is blocked by the reflection of external light or the contrast of the bright room of the screen is reduced.

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to effectively block external light reflection occurring outside the front substrate without causing abnormal light emission of a discharge cell, thereby improving contrast of a screen. It is to provide a display panel.

In order to achieve the above object, the present invention,

The discharge cells and the non-discharge regions disposed in a space between the first and second substrates, the discharge sustaining electrodes and the address electrodes provided on the first and second substrates, and the first and second substrates, respectively. A partition wall to be formed, a fluorescent layer formed in each discharge cell, and an external light absorbing portion formed at a position corresponding to the non-discharge regions outside the first substrate, wherein the non-discharge region passes through the center of each discharge cell; Provided is a plasma display panel disposed in an area surrounded by a vertical axis.

The non-discharge regions are formed to have independent cell structures by the partition walls, and may be formed such that the center thereof coincides with the center of the region surrounded by the horizontal axis and the vertical axis.

Preferably, the discharge cells are formed narrower as the widths of both ends located along the address electrode direction become farther from the center of the discharge cells.

The partition wall includes a first partition member in a direction parallel to the address electrode and a second partition member connecting the first partition members without being parallel to the address electrode, wherein the second partition member is inclined with the address electrode direction. The cross may be formed on the first partition member.

The discharge sustaining electrode includes a bus electrode corresponding to each discharge cell and a protruding electrode extending from the bus electrode toward the inside of each discharge cell so as to face each other, and the protruding electrode is disposed at both ends of the discharge cell. As the corresponding rear end becomes farther from the center of the discharge cell, the width may be narrower.

In addition, the protruding electrode may be formed to be parallel to the inner wall of the discharge cell on both sides of the rear end portion corresponding to both ends of the discharge cell, and may have a recess in the center of the end of the pair facing each other.

The external light absorbing portion includes a groove formed to have a predetermined depth at a position corresponding to the non-discharge regions on the outside of the first substrate, and a black light blocking material filled in the groove, wherein the depth of the groove is in the range of 100 to 300 μm. Is preferred. In addition, the planar shape of the external light absorbing part may be the same as the planar shape of the non-discharge area.

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

1 is a partially exploded perspective view of a plasma display panel according to an exemplary embodiment of the present invention, and FIGS. 2 and 3 are partial plan views and partial cross-sectional views of the first substrate, respectively.

Referring to the drawings, the plasma display panel according to the present embodiment (hereinafter, referred to as 'PDP') is disposed so that the first substrate 2 and the second substrate 4 are opposed to each other at random intervals. Discharge cells 8R, 8G, 8B and non-discharge regions 10 partitioned by the partition 6 are provided in the interspace. In addition, outside the first substrate 2 to which the external light is incident, an external light absorbing part 12 for suppressing external light reflection is formed at a position corresponding to the non-discharge area 10.

First, address electrodes 14 are formed on an inner surface of the second substrate 4 along one direction (Y direction in the drawing), and a dielectric layer is formed on the entire inner surface of the second substrate 4 while covering the address electrodes 14. 16 is formed. The address electrodes 14 are formed in a stripe pattern, for example, and are formed to be parallel to each other while maintaining a predetermined distance from the adjacent address electrodes 14.

The partition wall 6 is disposed on the dielectric layer 16 of the second substrate 4 to partition the discharge cells 8R, 8G, and 8B and the non-discharge regions 10. Here, the discharge cells 8R, 8G, and 8B are spaces where gas discharge and light emission are intended to occur, and the non-discharge regions 10 mean areas or spaces where gas discharge and light emission are not intended. 1 and 2 illustrate an embodiment in which discharge cells 8R, 8G, and 8B and non-discharge regions 10 are formed to have independent cell structures, respectively.

More specifically, the partition wall 6 partitions each of the discharge cells 8R, 8G, and 8B along the direction of the address electrode 14 and the direction orthogonal to the address electrode 14 (the X direction in the drawing), respectively. The discharge cells 8R, 8G, and 8B have an optimized shape in consideration of the diffusion form of the discharge gas. In addition, assuming a virtual horizontal axis (H) and a vertical axis (V) passing through the center of each discharge cell (8R, 8G, 8B), the non-discharge area in the area surrounded by the horizontal axis (H) and the vertical axis (V) 10 is located.

The optimized structure of the discharge cells 8R, 8G, and 8B is characterized by the widths of the both ends located in the direction of the address electrode 14 in the respective discharge cells 8R, 8G, and 8B (depending on the direction orthogonal to the address electrode). Width) means a shape that narrows away from the center of each discharge cell 8R, 8G, 8B.

That is, referring to FIG. 1, the width Wc at the center of the discharge cells 8R, 8G, and 8B is made larger than the width We at the end, and the width We at the end is the discharge cell 8R, The narrower the distance from the center of 8G, 8B). Thus, in this embodiment, both ends of the discharge cells 8R, 8G, 8B have a trapezoidal shape, and the overall planar shape of each discharge cell 8R, 8G, 8B is octagonal.

The non-discharge region 10 is disposed in an area surrounded by the virtual horizontal axis H and the vertical axis V passing through the center of each discharge cell 8R, 8G, 8B, in particular the center thereof is the horizontal axis H. It may be formed to coincide with the center of the area surrounded by and the vertical axis (V). That is, in the above structure, one common non-discharge is formed between a pair of discharge cells adjacent in the direction of the address electrode 14 and a pair of discharge cells neighboring in the direction orthogonal to the address electrode 14. An area is formed.

As a result, the partition wall 6 may include a first partition member 6a in a direction parallel to the address electrode 14, and a second partition wall connecting the first partition members 6a without being parallel to the address electrode 14. The second partition wall member 6b is formed to intersect the first partition wall member 6a with a predetermined inclination angle in this embodiment. In particular, in the present embodiment, the second partition member 6b has an approximately X-shape between discharge cells neighboring in the direction of the address electrode 14.

The red, green, and blue phosphors are coated in the discharge cells 8R, 8G, and 8B to form the fluorescent layers 18R, 18G, and 18B.

On the other hand, discharge holding electrodes 20 and 22 are formed on an inner surface of the first substrate 2 opposite to the second substrate 4 along a direction orthogonal to the address electrode 14 (X direction in the drawing). In addition, the transparent dielectric layer 24 and the MgO passivation layer 26 are disposed on the entire inner surface of the first substrate 2 while covering the discharge sustain electrodes 20 and 22. For reference, in FIGS. 1 and 2, the transparent dielectric layer and the MgO protective layer are omitted for simplicity of the drawings.

The discharge sustaining electrode 20 is formed in a stripe pattern and has a pair of bus electrodes 20a and 22a corresponding to each of the discharge cells 8R, 8G, and 8B, and each discharge cell 8R, from the bus electrodes 20a and 22a. It consists of the protruding electrodes 20b and 22b extended toward the inside of 8G and 8B so that a pair may face. The protruding electrodes 20b and 22b may be formed to be parallel to the inner walls of the discharge cells 8R, 8G and 8B on both sides of the rear end portions corresponding to both ends of the discharge cells 8R, 8G and 8B. That is, in the present embodiment, the rear ends of the protruding electrodes 20b and 22b have a trapezoidal shape that narrows toward the bus electrodes 20a and 22a so as to match the end shapes of the discharge cells 8R, 8G and 8B.

The protruding electrodes 20b and 22b may be made of a transparent electrode such as indium tin oxide (ITO), and it is preferable to use a conventional metal electrode as the bus electrodes 20a and 22a.

In addition, a plurality of external light absorbing portions 12 are formed at a position corresponding to the non-discharge area 10 outside the first substrate 2 to which external light is incident. The external light absorbing unit 12 absorbs a part of the external light incident on the PDP and blocks the external light reflection by covering the display light due to the emission of the fluorescent layers 18R, 18G, and 18B by the positional characteristic corresponding to the non-discharge area 10. Maximize the effect.

As shown in FIG. 3, the external light absorbing part 12 corresponds to the non-discharge area 10 outside the first substrate 2 and is formed to have a predetermined depth, and the groove 12a. Made of black light blocking material 12b. The light blocking material 12b may be a material showing black color, and may be made of, for example, the same material as a conventional blocking film.

The groove 12a may be easily formed on the outside of the first substrate 2 by a conventional sand blast or etching method, and the depth of the groove 12a may be cracked in the first substrate 2. It can be formed in a suitable range, preferably 100 to 300 μm deep, which does not occur. The planar shape of the external light absorbing portion 12 is the same as the planar shape of the non-discharge region 10, but is not necessarily limited thereto.

By the above-described configuration, the address voltage Va is applied between the address electrode 14 and one of the discharge sustaining electrodes, i.e., the protruding electrodes, to select a specific discharge cell by the address discharge, and again, the pair of protruding electrodes 20b. When the sustain voltage Vs is applied between and 22b, vacuum ultraviolet rays generated during sustain discharge excite the fluorescent layer to emit visible light through the transparent front substrate 2.

At this time, since the gas discharge starts from the center of the discharge cells 8R, 8G, 8B and diffuses toward the ends of the discharge cells 8R, 8G, 8B during the above-described sustain discharge, the diffusion pattern of the gas is shown. The structure of the discharge cells 8R, 8G, 8B optimized in consideration plays a role of improving the discharge efficiency. Furthermore, as the non-discharge regions 10 formed around the discharge cells 8R, 8G, 8B prevent cross-talk between adjacent discharge cells, and absorb and radiate heat from the discharge cells 8R, 8G, 8B. It acts to increase the discharge efficiency.

In addition, the above-described external light absorbing portion 12 absorbs external light incident on the PDP (see arrows in FIG. 3) to suppress external light from penetrating into the discharge cell. As a result, the external light absorbing part 12 minimizes the external light reflection occurring outside the first substrate 2 to improve the clear room contrast of the screen, and effectively prevents a part of the screen covered by the external light reflection. Furthermore, since the external light absorbing portion 12 is located outside the first substrate 2 instead of the inner surface of the first substrate 2, the external light absorbing portion 12 does not affect the discharge cells 8R, 8G, and 8B, and thus discharge cells 8R and 8G. , 8B) is effective in preventing abnormal discharge.

4 is a partial plan view of the PDP for explaining a modification of the protruding electrode. In this modification, the protruding electrodes 20b and 22b form a recess 28 at the center of the end where the pair opposes each other. The concave portion 28 allows the pair of protruding electrodes 20b and 22b to have an enlarged gap G at the center portion of the discharge cells 8R, 8G and 8B, and the discharge cell (B) by the enlarged gap G. 8R, 8G, 8B) has the advantage of more effectively spreading the plasma discharge starting from the center of the discharge efficiency.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and 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 range of.

As described above, according to the present invention, the external light absorbing part provided on the first substrate absorbs a part of the external light without covering the display light, thereby minimizing the external light reflection. Therefore, the plasma display panel of the present invention improves the contrast of the clear room of the screen and prevents a part of the screen from being blocked by the reflection of external light. In addition, as the external light absorbing portion is located outside the first substrate, there is an effect of preventing abnormal light emission of the discharge cells by the light blocking material.

1 is a partially 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 exemplary embodiment of the present invention.

3 is a cross-sectional view of the first substrate shown in FIG. 1.

4 is a partial plan view of a plasma display panel for explaining a modification according to an embodiment of the present invention.

5 and 6 are partial exploded perspective views of the plasma display panel according to the prior art and cross-sectional views of the front substrate shown in FIG. 5, respectively.

Claims (15)

First and second substrates disposed to face each other; Discharge sustaining electrodes and address electrodes provided on the first and second substrates, respectively; Barrier ribs disposed in a space between the first and second substrates to form discharge cells and non-discharge regions; A fluorescent layer formed in each of the discharge cells; And An external light absorbing part formed at a position corresponding to the non-discharge areas on the outside of the first substrate, The non-discharge area is, Disposed in an area surrounded by a horizontal axis and a vertical axis passing through the center of each discharge cell, The cell walls are formed to have independent cell structures. Plasma display panel. delete The method of claim 2, And the non-discharge area is formed such that the center thereof coincides with the center of the area surrounded by the horizontal axis and the vertical axis. The method of claim 1, And wherein the discharge cells are formed narrower as the widths of both ends located in the direction of the address electrodes move away from the center of the discharge cells. The method of claim 4, wherein And both ends of the discharge cells have a trapezoidal shape. The method of claim 1, The partition wall includes a first partition member in a direction parallel to the address electrode and a second partition member connecting the first partition members without being parallel to the address electrode. The method of claim 6, And the second partition member crosses the first partition member at an angle inclined to the address electrode direction. The method of claim 1, The discharge sustaining electrode includes a bus electrode corresponding to each pair of discharge cells, and a protruding electrode extending from the bus electrode toward the inside of each discharge cell so as to face each other. The method of claim 8, And the protruding electrode is formed to be narrower as the rear ends corresponding to both ends of the discharge cell move away from the center of the discharge cell. The method according to claim 4 or 8, And the protruding electrode is formed to be parallel to an inner wall of a discharge cell at both sides of a rear end portion corresponding to both ends of the discharge cell. The method of claim 8, The protruding electrode has a concave portion at a central portion of an end of which the pair opposes each other. The method of claim 1, The external light absorbing unit includes a groove formed to have a predetermined depth at a position corresponding to the non-discharge regions outside the first substrate and a light blocking material filled in the groove. The method of claim 12, A plasma display panel having a depth of 100 to 300 mu m. The method of claim 12, And the light blocking material is black. The method of claim 1, And the external light absorbing portion has a shape substantially the same as a plane shape of the non-discharge area.