KR20080044666A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to maximumly lower the brightness of mixed color by disposing two subtractively mixed colors on a front substrate in triple complementary color. A front substrate(20) colored by a first color and a rear substrate(10) are opposite to each other, and barrier ribs(16) colored by a second color are interposed between the front substrate and the rear substrate to define plural discharge cells therebetween. Address electrodes(12) are formed at positions corresponding to the discharge cells, and display electrodes(25) are formed to cross the address electrodes. A dielectric layer(28) is formed to cover the display electrodes, and is colored by a third color which is subtractively mixed with the first color and the second color, respectively. A phosphor layer is formed in the discharge cell, and a filter portion(30) is formed on the front substrate and colored by a fourth color which is subtractively mixed with the first color.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

FIG. 2 is a plan view illustrating an arrangement relationship between discharge cells and display electrodes of the plasma display panel illustrated in FIG. 1.

3 is a cross-sectional view taken along line III-III of FIG. 2.

4 is a cross-sectional view illustrating an example in which the filter portion is composed of a single membrane.

FIG. 5 is a plan view illustrating color relationships between a filter part, a front substrate, a dielectric layer, and a partition of the plasma display panel shown in FIG. 1.

The present invention relates to a plasma display panel which reduces reflection of light incident from the outside (hereinafter, referred to as external light).

The plasma display panel (hereinafter referred to as PDP) is a display device that realizes an image using visible light generated by ultraviolet rays emitted from a plasma formed by gas discharge to excite the phosphor layer. Such PDPs have been spotlighted as the next generation flat panel display because of their high resolution and large screen configuration.

In general, a commonly used three-electrode surface discharge type PDP includes a scan electrode and a sustain electrode on a front substrate, and an address electrode on a rear substrate. The partition wall partitions the discharge cells along a portion where the scan electrodes and the address electrodes intersect.

Such discharge cells are formed in a number of millions or more to form a matrix array, and display images necessary by selecting and discharging the discharge cells to be turned on among the discharge cells.

By the way, while the PDP selects a discharge cell to display an image, external light generated from various light sources is incident on the PDP outside the PDP.

However, some of the external light incident on the PDP is reflected by the PDP and mixed with the image displayed by the PDP. In particular, since bright light contrast decreases as more external light is introduced into the discharge cells in a bright external condition (bright room condition), there is a problem of degrading display performance of an image actually expressed by the PDP.

The present invention was devised to solve such a problem, and an object of the present invention is to prevent external light reflection while minimizing absorption of visible light emitted from the PDP.

In order to achieve the above object, the plasma display panel provided in the present invention discharges the cell by partitioning a space between the front substrate, the rear substrate facing the front substrate, and the front substrate and the rear substrate colored in the first color. And a barrier rib that is colored in a second color, an address electrode formed to correspond to the discharge cell, a display electrode formed to cross the address electrode in the discharge cell, and covering the display electrode. A dielectric layer colored in a third color subtracted and mixed with a second color, a phosphor layer formed in the discharge cell, and a filter part formed on the front substrate and colored in a fourth color subtracted and mixed with the first color. It is configured.

Here, the first color and the third color, the first color and the fourth color, the mixture of the second color and the third color is achromatic.

The filter unit may include an electromagnetic wave blocking film formed on the front substrate to selectively block electromagnetic waves, and an external light blocking unit formed on the electromagnetic wave blocking film and colored in a fourth color while reducing external light reflection.

In addition, the filter unit may be formed as a single layer formed on the front substrate to reduce the reflection of external light while blocking the electromagnetic wave.

The first color and the second color, the third color and the fourth color may be the same color.

In this case, the first color and the third color, the first color and the fourth color, the second color and the third color has a complementary color relationship, preferably the first color is brown or blue.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 is an exploded perspective view of a portion of a plasma display panel (hereinafter referred to as a PDP) according to an embodiment of the present invention.

In the PDP of this embodiment, the front substrate 20 and the rear substrate 10 are disposed to face each other, and the partition wall 16 partitions the space therebetween to form the discharge cells 18. Here, the front substrate 20 is colored in a first color, and the partition wall 16 is colored in a second color.

Along the discharge cells 18, the display electrode 25 and the address electrode 12 are formed to cross each other, and the display electrode 25 is covered and protected by a dielectric layer 28 made of a dielectric material. Dielectric layer 28 is colored in a third color subtracted and mixed with the first color and the second color, respectively.

The filter unit 30 is formed on the front surface of the front substrate 20, and the filter unit 30 is colored in a fourth color subtracted from the first color of the front substrate 20.

In more detail, the front substrate 20 is formed of a transparent material such as tempered glass through which light is transmitted. On the front substrate, an image formed by the discharge of the discharge cells 18 is displayed.

The front substrate 20 is colored in a first color. Here, the first color is preferably brown or blue. When colored in brown, the front substrate 20 may include one or more components selected from Cu, Sb, and Cr, and may be colored in the first color. In addition, when colored blue, the front substrate 20 may include one or more components selected from Mn, Ni, and Co.

Then, the display electrode 25 is formed corresponding to each discharge cell 18. The display electrode 25 may be formed as a pair of the scan electrode 21 and the sustain electrode 23, and the scan electrode 21 and the sustain electrode 23 face the plane of the discharge cell 18 to form a discharge gap ( g) (see FIG. 2). Here, the scan electrode 21 selects a discharge cell 18 that is turned on by working with the address electrode 12, and the sustain electrode 23 is held for the selected discharge cell 18 by working with the scan electrode 21. A discharge is formed during the period.

The display electrode 25 is embedded and protected by a dielectric layer 28 formed of a dielectric (for example, PbO, B ₂ O ₃ , SiO ₂ ). The dielectric layer 28 prevents damage to the display electrode 25 due to collision of charged particles during discharge.

This dielectric layer 28 is then colored in a third color. Here, the third color is subtracted and mixed with the first color of the front substrate 20. For example, the third color may be blue or brown.

In the case where the front substrate 20 is blue, the dielectric layer 28 is preferably brown. In this case, dielectric layer 28 includes one or more components selected from Cu, Sb, Cr as the composition in addition to the dielectric.

When the front substrate 20 is brown, the dielectric layer 28 is colored blue. In this case, dielectric layer 28 includes one or more components selected from Mn, Ni, and Co in addition to the dielectric.

As such, the passivation layer 29 may be further formed on the dielectric layer 28 to be formed. The protective film 29 prevents the charged particles from directly colliding with the dielectric layer 28 during the discharge to damage the dielectric layer 28, and when the charged particles collide, the secondary electrons are released to increase discharge efficiency.

In addition, a filter unit 30 is formed on the front surface of the front substrate 20 to partially block electromagnetic waves in some bands from the discharge cells 18 while reducing reflection of external light. The filter unit 30 is colored with a fourth color subtracted from the first color of the front substrate 20.

In addition, an address electrode 12 may be formed on the rear substrate 10 facing the front substrate 20. As shown, the address electrode 12 crosses the display electrode 25 and extends in one direction (y-axis direction in the drawing) corresponding to each discharge cell 18, and is adjacent to the neighboring address electrode 12. It is formed side by side. Therefore, when the entire back substrate 10 is viewed, the entire address electrode 12 has a stripe shape. The address electrode 12 selects a discharge cell 18 that is turned on by working with the scan electrode 21.

The address electrode 12 is embedded and protected by the dielectric layer 14, and therewith along the horizontal partition member 16a and the horizontal partition member 16a which partition the discharge cell 18 in the x-axis direction of the drawing. The partition wall 16 including the vertical partition member 16b partitioning the discharge cell 18 in the y-axis direction is formed to partition the discharge cell 18.

The partition 16 thus formed is colored in a second color. Here, the second color is subtracted and mixed with the third color of the dielectric layer 28. For example, the third color may be blue or brown.

In the case where the dielectric layer 28 is blue, the partition 16 is preferably brown. In this case, the partition wall 16 includes at least one component selected from Cu, Sb, Cr as the composition in addition to the dielectric.

And when the dielectric layer 28 is brown, the partition 16 is colored blue. In this case, the partition wall 16 includes one or more components selected from Mn, Ni, and Co as the composition in addition to the dielectric.

As a result, a filter part 30 of a fourth color is formed on the front substrate 20 of the first color, and a dielectric layer 28 of the third color and a partition wall of the second color are formed below the front substrate 20. (16) Since the filter unit 30, the front substrate 20, the dielectric layer 28, the fourth color, the first color, the third color, and the second color of the partition wall 16 are mixed to form a mixed color. . Here, it is preferable that the first color and the second color, the first color and the fourth color, and the second color and the third color are subtracted and mixed to form an achromatic color.

In the discharge cell 18, a phosphor layer 19 emitting color visible light is formed. The phosphor layer 19 is formed by applying a phosphor to the wall surface and the bottom surface of the partition wall 16 partitioning the discharge cells 18.

In addition, the phosphor layer 19 is formed in discharge cells for each of red (R), green (G), and blue (B) to display an image, and red discharge cells 18R, green discharge cells 18G, and blue discharges are formed. The cells 18B form one pixel in a set.

As described above, the discharge cells 18 in which the phosphor layer 19 is formed are filled with a mixed discharge gas such as neon and xenon.

FIG. 2 is a plan view illustrating an arrangement relationship between the discharge cells and the display electrodes of the PDP shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2.

Referring to these drawings, the partition wall 16 is extended in the direction intersecting with the horizontal partition member 16a extending in the direction crossing the address electrode 12 (the x-axis direction in the drawing) (the address in the y-axis direction of the drawing). And a longitudinal partition member 16b extending in the extending direction of the electrode).

Therefore, the discharge cells 18 are partitioned by the horizontal partition member 16a in the x-axis direction and partitioned by the vertical partition member 16b in the y-axis direction to form a matrix arrangement as a whole. At this time, the discharge cells of the same color are arranged in a column (y-axis direction of the drawing), the discharge cells of different colors are located in the row direction (x-axis direction of the drawing) in order. Therefore, the discharge cells of different colors positioned in the row direction, that is, the red discharge cells 18R, the green discharge cells 18G, and the blue discharge cells 18B form one set to form one pixel.

The scan electrode 21 and the sustain electrode 23 of the display electrode 25 face the upper surface of the discharge cell 18 to form a discharge gap g.

The scan electrode 21 and the sustain electrode 23 extend long while maintaining a constant distance g from each other in one direction (x-axis direction in the drawing). In this case, the scan electrode 21 and the sustain electrode 23 are formed in a thin film on the opposite surface of the front substrate 20 facing the rear substrate 10, and the belt-shaped transparent electrodes 211 and 231 and the transparent electrode are formed. It may be formed by including the band-shaped bus electrodes 213 and 233 formed on the (211, 231). With this configuration, the display electrode 25 is located on the upper surface of the discharge cell 18 (see FIG. 3).

On the other hand, the discharge cell 18 is disposed above the front substrate 20 with the filter unit 30 formed on the front surface of the front substrate 20 and the display electrode formed on the rear surface of the front substrate 20. Dielectric layers 28 filling the 25 are respectively provided.

Here, the front substrate 20 is colored in a first color to reduce reflection of external light incident from the outside toward the discharge cell, and the dielectric layer 28 is colored in a third color that is subtracted and mixed with the first color to form achromatic color. In addition, the third color of the dielectric layer 28 is subtracted and mixed with the second color of the partition 16 to form achromatic color.

On the other hand, the front of the front substrate 20, the filter unit 30 is formed in a uniform thickness over the entire front substrate (20). The filter unit 30 selectively blocks some electromagnetic waves that exit the front substrate 20 from the discharge cell and reduces surface reflection of external light.

The filter unit 30 may be formed with an electromagnetic wave shielding film 31 and an external light shielding film 33. The electromagnetic wave blocking film 31 is made of a conductive transparent material (eg, ITO) on the front substrate 20. The electromagnetic wave shielding film 31 selectively blocks a part of electromagnetic waves emitted from the discharge cell due to the conductivity.

The external light blocking film 33 is formed on the electromagnetic wave blocking film 31 formed as described above. The outer light shielding film 33 includes one or more components selected from Co, Mn, and Ru at a uniform thickness on the electromagnetic wave shielding film 31, and is configured to absorb the external light without reflecting it from the surface.

In addition, the filter unit 30 may be configured as a single film as shown in FIG. In this case, the filter unit 30 is composed of a mixture of one or more components selected from Co, Mn, and Ru and a metal material.

The filter unit 30 configured as described above is colored with a fourth color that interacts with the first color of the front substrate 20 to reduce reflection of external light. When the filter unit 30 includes the electromagnetic wave shielding film 31 and the external light shielding film 33 as shown in FIG. 3, the external light shielding film 33 is colored in the fourth color. The fourth color is preferably subtracted and mixed with the first color of the front substrate 20, and the mixed color of the first color and the fourth color is achromatic.

As described above, in the PDP of the present embodiment, the front substrate 20 is interposed between the filter unit 30 having the fourth color, the dielectric layer 28 having the third color, and the partition wall 16 having the second color. Accordingly, the fourth color of the filter unit 30, the first color of the front substrate 20, the first color of the front substrate 20, the third color of the dielectric layer 28, and the third color of the dielectric layer 28 The second color of the partition 16 is overlaid.

This will be described in detail with reference to FIG. 5. 5 is a plan view illustrating a color relationship in which the filter part, the front substrate, the dielectric layer, and the partition wall are subtracted and mixed.

Referring to FIG. 4, the dielectric layer 28, the front substrate 20, and the filter unit 30 are sequentially positioned on the discharge cells 18 partitioned by the vertical partition member 16b and the horizontal partition member 16a. The upper surface of the discharge cell 18 is covered.

On the other hand, the partition 16 is colored in a second color, and the dielectric layer 28 is colored in a third color. As a result, in the portion A where the partition wall 16 and the dielectric layer 28 overlap, the second color and the third color overlap and appear mixed.

At this time, in the present embodiment, since the second color and the third color are subtracted and mixed, and preferably, they are complementary to each other, the mixed color of the second color and the third color appears to be achromatic with good light absorption. .

On the other hand, even in the relationship between the dielectric layer 28 and the front substrate 20, the dielectric layer 28 is colored in the third color, and the front substrate 20 is colored in the first color. As a result, in the portion B where the front substrate 20 and the dielectric layer 28 overlap, the first color and the third color overlap and appear mixed.

At this time, in the present embodiment, since the first color and the third color are in a subtractive mixing relationship, and preferably in the complementary color relationship, the mixed color of the first color and the third color appears to be achromatic with good light absorption.

In addition, even in the relationship between the front substrate 20 and the filter unit 30, since the front substrate 20 is colored in the first color, and the filter unit 30 is colored in the fourth color, the front substrate 20 ) And the filter unit 30 overlap with each other, the first color and the fourth color are mixed.

At this time, in the present embodiment, since the first color and the fourth color are subtracted and mixed, and preferably in the complementary color relationship, the mixed color of the first color and the fourth color appears to be achromatic with good light absorption.

As such, the second color of the partition wall 16 and the third color of the dielectric layer 28 are mixed to form achromatic color, and the first color of the front substrate 20 and the second color of the dielectric layer 28 are mixed to form achromatic color. Since the first color of the front substrate 20 and the fourth color of the filter unit 30 are mixed to form an achromatic color, the filter unit 30, the front substrate 20, the dielectric layer 28, and the partition wall 16 are all mixed together. Since the visible portion D has a lower brightness than the other portions A, B, and C and forms a dark black color, external light directed toward the discharge cell is not reflected at the surface and is absorbed.

In the present embodiment, the third color of the filter portion 30 is preferably blue. Since the filter unit 30 is formed in front of the front substrate 20 and is ahead of other portions, the filter unit 30 directly faces the viewer's view. While the blue color improves visibility, when the light penetrates the front substrate 20 in the discharge cell, the color temperature may be increased when the panel is implemented. In addition, there is an advantage in that the luminance of the blue phosphor is relatively lower than other colors due to the physical properties of the phosphor.

As such, when the filter unit 30 is colored in blue, the front substrate 20 is colored in brown, which is complementary with blue. In addition, the dielectric layer 28 is colored in blue having a complementary color relationship with brown of the front substrate 20, and the partition wall 16 is colored in brown having a complementary color relationship with the dielectric layer 28. As a result, the color of the filter unit 30 and the dielectric layer 28 may be the same, and the color of the front substrate 20 and the partition wall 16 may be the same.

On the other hand, Table 1 below is the same as the PDP (42 inches, SD class) (experimental example) of the present embodiment configured as described above, but the bright room contrast and the external light reflectance of the non-colored PDP (comparative example) experiments One result.

As can be seen from the experimental results, it can be seen that, in the case of coloring in the same manner as in the present embodiment, there is an excellent effect in bright room contrast and external light reflection luminance.

TABLE 1

Comparative example Experimental Example Real room contrast 70: 1 151: 1 External light reflectance (cd / m ² ) 15.2 6.6

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

As described above, according to the present invention, two colors that are subtracted and mixed to the front substrate on which an image is displayed form a triple complementary relationship, which reduces the reflection of external light by lowering the brightness of the mixed color as much as possible, and maximizes the light emitted from the discharge cell. It has the effect of absorbing less.

Furthermore, in the present invention, since the filter portion is formed on the front substrate, in addition to the image quality improvement effect due to the filter portion, the coloring effect can be obtained as described above.

Claims (11)

A front substrate colored in a first color, A back substrate facing the front substrate, A partition wall partitioning a space between the front substrate and the rear substrate to form a discharge cell, and colored in a second color; An address electrode formed to correspond to the discharge cell, A display electrode formed to cross the address electrode in the discharge cell; A dielectric layer covering the display electrode and colored in a third color subtracted and mixed with the first color and the second color, respectively; A phosphor layer formed in the discharge cell, The filter unit is formed on the front substrate and colored in a fourth color subtracted from the first color. Plasma display panel comprising a. The method of claim 1, The mixture of the first color and the third color is achromatic. The method of claim 1, The mixture of the first color and the fourth color is achromatic. The method of claim 1, The mixture of the second color and the third color is achromatic. The method of claim 1, The filter unit, an electromagnetic wave blocking film formed on the front substrate to selectively block electromagnetic waves; The external light blocking unit formed on the electromagnetic wave shielding film and colored in a fourth color while reducing reflection of external light. Plasma display panel comprising a. The method of claim 1, The filter unit is formed on the front substrate of the plasma display panel is composed of a single film to reduce the reflection of external light while blocking the electromagnetic waves. The method according to any one of claims 1 to 6, And the first color and the second color are the same color. The method of claim 7, wherein And the third and fourth colors are the same color. The method of claim 7, wherein And the first and third colors, the first and fourth colors, and the second and third colors are complementary colors. The method of claim 9, And the first color is brown. The method of claim 9, And the first color is blue.

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