KR100739600B1 - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to enhance bright room contract by forming a dielectric layer consisting of a first layer colored by a first color and a second layer colored by a second color which is complementary to the first color. Address electrodes(11) are extended in a first direction, in which each address electrode corresponds to each discharge cell. First and second electrodes(31,32) are extended in a second direction crossing the first direction, in which each electrode corresponds to each discharge cell. A dielectric layer(13) is formed on one of both substrates which is irradiated by visible rays. The electric layer consists of a layer colored by a first color and a layer colored by a second color which is complementary to the first color.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.

3 is a plan view showing an arrangement relationship between discharge cells and electrodes.

4 is an exploded perspective view illustrating the partition pattern and the coloring part pattern of the dielectric layer.

<Explanation of symbols for main parts of the drawings>

10: first substrate (back substrate) 11: address electrode

13, 21: dielectric layer 16: partition wall

16a: first partition member 16b: second partition member

17 discharge cell 19 phosphor layer

20: second substrate (front substrate) 24, 25, 26: first, second, third dielectric layer

23: protective film 27: coloring part

27a, 27b: 1st, 2nd coloring part 31: 1st electrode (holding electrode)

31a, 32a: transparent electrode 31b, 32b: bus electrode

32: second electrode (scanning electrode)

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 improves bright room contrast by improving black ratio according to a complementary color effect while maintaining luminance.

In general, a plasma display panel is a visible light of red (R), green (G) and blue (B) generated by exciting the phosphor using a vacuum ultra-violet (VUV) emitted from the plasma obtained through gas discharge It is a display device for implementing an image.

As an example, an AC plasma display panel forms address electrodes on a rear substrate and covers the address electrodes with a dielectric layer. The partition walls are disposed between the address electrodes on the dielectric layer to form a stripe shape, and phosphor layers of red (R), green (G), and blue (B) layers are formed on the partition walls. On the front substrate facing the rear substrate, display electrodes composed of a pair of sustain electrodes and scan electrodes are formed along the direction crossing the address electrodes, and a dielectric layer and an MgO protective film cover the display electrodes. A discharge cell is formed at a point where the address electrodes on the rear substrate and the pair of display electrodes on the front substrate cross each other. In the plasma display panel, millions of unit discharge cells are arranged in a matrix form.

The memory characteristic is used to drive the discharge cells of the plasma display panel. In more detail, in order to cause a discharge between the sustain electrode constituting the pair of display electrodes and the main pre-electrode, a potential difference of a specific voltage or more is required, and the voltage at the boundary is called a firing voltage (Vf). . When the scan voltage and the address voltage are respectively applied to the scan electrode and the address electrode, the discharge is started to form a plasma in the discharge cell, and the electrons and ions of the plasma move toward the electrodes having opposite polarities.

On the other hand, a dielectric layer is applied to each electrode of the plasma display panel, so that most of the moved space charges are stacked on the dielectric layer having opposite polarity, so that the net space potential between the scan electrode and the address electrode is originally applied to the address. It becomes lower than voltage Va, discharge becomes weak, and address discharge disappears. At this time, a relatively small amount of electrons are accumulated in the sustain electrode, and a relatively large amount of ions are accumulated in the scan electrode. The charges accumulated on the sustain electrode and the dielectric layer covering the scan electrode are wall charged (Qw). The space voltage formed between the sustain electrode and the scan electrode by these wall charges is referred to as wall voltage (Vw).

Subsequently, when the discharge sustain voltage Vs is applied to the sustain electrode and the scan electrode, the sum of the magnitudes of the discharge sustain voltage Vs and the wall voltage Vw (Vs + Vw) is the discharge start voltage Vf. If higher, sustain discharge occurs in the discharge cell. The vacuum ultraviolet (VUV) generated at this time excites the phosphor and emits visible light through the transparent front substrate.

However, when there is no address discharge between the scan electrode and the address electrode (that is, when no address voltage Va is applied), wall charges do not accumulate between the sustain electrode and the scan electrode, and consequently, the sustain electrode and the scan electrode. There is no wall voltage between them. At this time, only the discharge sustain voltage Vs applied to the sustain electrode and the scan electrode is formed in the discharge cell. Since the discharge sustain voltage is lower than the discharge start voltage Vf, the gas space between the sustain electrode and the scan electrode cannot be discharged.

Various attempts have been made to improve the ratio of black in the driving of the plasma display panel driven as described above, that is, the black portion ratio, thereby improving the clear room contrast.

As an example, a method using a complementary color relationship has been developed. In the plasma display panel using this complementary color relationship, the entire dielectric layer of the front substrate is colored in the blue system, and the partition wall of the back substrate is colored in the red system, thereby improving the clear room contrast.

However, this plasma display panel improves clear room contrast by coloring the partitions with a red system, but absorbs a lot of visible light generated in the discharge cells in the partitions of the red system. Has a problem of lowering.

An object of the present invention is to provide a plasma display panel which improves bright room contrast by improving black ratio by complementary color relationship while maintaining luminance.

According to an embodiment of the present invention, a plasma display panel includes: a first substrate and a second substrate disposed to face each other, a partition wall disposed between the two substrates to partition discharge cells, a phosphor layer formed on the discharge cells, An address electrode extending in a first direction corresponding to the discharge cells, a first electrode and a second electrode extending and formed in a second direction crossing the first direction corresponding to the discharge cells, and the A dielectric layer formed on a substrate to which visible light is irradiated from both substrates, wherein the dielectric layer is formed of at least two layers, one of which is colored in a first color, and the other is complementary to the first color. It may include a coloring portion to be colored in a second color having a, the coloring portion may correspond to at least a portion of the partition wall.

The dielectric layer may include a first dielectric layer formed on the substrate, a second dielectric layer formed on the first dielectric layer, and a third dielectric layer formed on the second dielectric layer.

The first color may be blue and the second color may be brown.

The first dielectric layer and the second dielectric layer may be colored in the first color, and the third dielectric layer may be colored in the second color.

The colored portion may be formed in the same pattern as the pattern of the partition wall.

The barrier rib may include first barrier rib members extending in the first direction and formed at intervals corresponding to the discharge cells along the second direction.

The coloring part may be formed in the same pattern as the pattern of the first partition member.

The partition wall may include second partition wall members that extend in the second direction between the first partition members and are formed at intervals corresponding to the discharge cells along the first direction.

The colored portion may be formed in the same pattern as the patterns of the first and second partition wall members.

The coloring part crosses the first coloring part formed in the first direction corresponding to the first partition members, and the second direction corresponding to the first coloring part and corresponding to the second partition wall members. It may include a second colored portion formed along.

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 may 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. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

1 is a perspective view schematically illustrating an exploded view of a plasma display panel according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.

Referring to these drawings, the plasma display panel according to the exemplary embodiment is disposed on the first substrate (hereinafter referred to as a "back substrate") 10 and the second substrate which are disposed to face each other at predetermined intervals. (Hereinafter referred to as "front substrate") 20 and partition walls 16 provided between the substrates 10 and 20. The partition 16 is formed at a predetermined height between the rear substrate 10 and the front substrate 20 to partition the plurality of discharge cells 17. The discharge cells 17 are filled with a discharge gas (for example, a mixed gas including neon (Ne) and xenon (Xe)) to generate vacuum ultraviolet rays by gas discharge, and absorbs the vacuum ultraviolet rays A phosphor layer 19 for emitting visible light is provided.

The plasma display panel includes an address electrode 11 and a first electrode (hereinafter referred to as a “holding electrode”) corresponding to each discharge cell 17 between the rear substrate 10 and the front substrate 20 in order to realize an image by gas discharge. 31 and a second electrode (hereinafter referred to as "scan electrode") 32 are provided.

As an example, the address electrode 11 is formed along the first direction (y-axis direction in the drawing) on the inner surface of the back substrate 10 to form discharge cells 17 adjacent to the y-axis direction. Corresponds continuously. In addition, the plurality of address electrodes 11 are arranged side by side to correspond to the discharge cells 17 adjacent to each other in a second direction (the x-axis direction in the drawing) that crosses the y-axis direction.

The address electrodes 11 are covered with a dielectric layer 13 covering the inner surface of the back substrate 10 as described above. The dielectric layer 13 prevents cations or electrons from directly colliding with the address electrode 11 during discharge, thereby preventing damage to the address electrode 11, and also forms and accumulates wall charges. Since the address electrode 11 is disposed on the rear substrate 10 and does not prevent the visible light from being irradiated forward, the address electrode 11 may be formed of an opaque electrode, that is, a metal electrode having excellent electrical conductivity.

The partition 16 is actually provided on the dielectric layer 13 to partition the discharge cells 17. The partition 16 includes first partition members 16a extending in the y-axis direction and second partition members 16b extending in the x-axis direction between the first partition members 16a. In addition, the discharge cells 17 are formed in a matrix structure.

In addition, the partition wall may be formed of first partition wall members extending in the y-axis direction to form discharge cells in a stripe structure (not shown). That is, the discharge cells form a structure that is open along the y-axis direction.

In this embodiment, the partition wall 16 forming the discharge cells 17 in a matrix structure is illustrated. In this state, when the second partition wall members 16b are removed, the partition wall structure is formed by the first partition wall members 16a. Discharge cells are formed. Therefore, a separate illustration of the discharge cells of the stripe structure is omitted here.

The phosphor layer 19 formed in each of the discharge cells 17 is coated with a phosphor paste on the side surface of the barrier rib 16 and the surface of the dielectric layer 13 positioned between the barrier ribs 16 and dried and It is formed by baking.

The phosphor layer 19 is formed of phosphors of the same color in the discharge cells 17 formed along the y-axis direction. In addition, the phosphor layer 19 is repeatedly formed by the phosphors of red (R), green (G), and blue (B) in the discharge cells 17 repeatedly disposed along the x-axis direction.

On the other hand, referring to Figure 3, the sustain electrode 31 and the scanning electrode 32 is provided on the inner surface of the front substrate 20, each discharge cell 17 to cause gas discharge in the discharge cells 17 In response to this, a surface discharge structure is formed. The sustain electrode 31 and the scan electrode 32 extend in the x-axis direction crossing the address electrode 11.

In addition, the sustain electrode and the scan electrode may be provided between the front substrate and the rear substrate to form an opposite discharge structure corresponding to the discharge cells (not shown).

Each of the sustain electrode 31 and the scan electrode 32 includes transparent electrodes 31a and 32a for generating a discharge and bus electrodes 31b and 32b for applying a voltage signal to the transparent electrodes 31a and 32a, respectively. Is formed. The transparent electrodes 31 a and 32 a are portions which cause surface discharge inside the discharge cell 17 and are formed of a transparent material (for example, indium tin oxide (ITO)) to secure the aperture ratio of the discharge cell 17. The bus electrodes 31b and 32b are formed of a metal material having excellent electrical conductivity to compensate for the high electrical resistance of the transparent electrodes 31a and 32a.

The transparent electrodes 31a and 32a form surface discharge structures with each of the widths W31 and W32 from the outer edge of the discharge cell 17 along the y-axis direction, and form a center portion of each discharge cell 17. To form a discharge gap (G). The bus electrodes 31b and 32b are disposed on the transparent electrodes 31a and 32a, respectively, and extend in the x-axis direction at the outside of the discharge cell 17. Therefore, when the voltage signal is applied to the bus electrodes 31b and 32b, the voltage signal is applied to each of the transparent electrodes 31a and 32a connected to the bus electrodes 31b and 32b.

Referring back to FIGS. 1 and 2, the sustain electrode 31 and the scan electrode 32 cross the address electrodes 11 and are covered with the dielectric layer 21 facing each other in correspondence with the discharge cells 17. The dielectric layer 21 forms and accumulates wall charges during discharge while protecting the sustain electrode 31 and the scan electrode 32 from gas discharge.

This dielectric layer 21 is covered with a protective film 23. For example, the protective film 23 is formed of transparent MgO to protect the dielectric layer 21, thereby increasing the secondary electron emission coefficient during discharge.

During the plasma display panel driving, a reset discharge is generated by a reset pulse applied to the scan electrode 31 in the reset period, and the scan pulse and the address electrode applied to the scan electrode 32 in the addressing period following the reset period. The address discharge is caused by the address pulse applied to 11), and then the sustain discharge is generated by the sustain pulse applied to the sustain electrode 31 and the scan electrode 32 in the sustain period.

The sustain electrode 31 and the scan electrode 32 serve as electrodes for applying sustain pulses required for sustain discharge, and the scan electrodes 32 serve as electrodes for applying reset pulses and scan pulses, and the address electrodes. Reference numeral 11 serves as an electrode for applying an address pulse. The sustain electrode 32, the scan electrode 32, and the address electrode 11 may differ in their roles according to voltage waveforms applied to the sustain electrodes 32, the scan electrodes 32, and the address electrodes 11, and are not necessarily limited to these roles.

The plasma display panel selects a discharge cell 17 to be turned on by the address discharge due to the interaction between the address electrode 11 and the scan electrode 32, and the interaction between the sustain electrode 31 and the scan electrode 32. The selected discharge cell 17 is driven by sustain discharge, thereby realizing an image.

On the other hand, the plasma display panel of the present embodiment by coloring the dielectric layer formed on the substrate irradiated with visible light of the two substrates (10, 20) in order to improve the bright room contrast by improving the black ratio by using the complementary color relationship while maintaining the brightness Is formed. In the present embodiment, since the visible light is irradiated onto the front substrate 20, the dielectric layer 21 of the front substrate 20 is colored.

In addition, the dielectric layer 21 is formed of at least two layers to increase the black portion by coloration and to improve the clear room contrast while maintaining brightness while minimizing the blocking of visible light emitted from the discharge cells 17.

As an example, when the dielectric layer is two layers, one layer has a colored portion 27 that is colored entirely by the first color and the other layer is partially colored by the second color. This first color and the second color have a complementary color relationship of black by dark blue mixing. As an example, the first color is blue and the second color is brown.

At this time, the coloring part 27 corresponds to a part of the partition 16 with respect to the xy plane direction. Therefore, the coloring part 27 increases only the black part ratio without blocking the visible light irradiated to the front from the discharge cell 17. FIG. In this state, the second color of the coloring part 27 overlaps with the first color in a part of the partition 16 to form black when the front substrate 20 is viewed from the front.

When one layer is colored by this first color, the luminance is slightly reduced. However, the clear-room contrast is greatly improved by the increase in the black fraction. Therefore, the plasma display panel has an improved quality as a whole.

2 and 4, the dielectric layer 21 will be described in more detail. The dielectric layer 21 is formed of three layers. That is, the dielectric layer 21 is formed on the front substrate 20 to cover the sustain electrode 31 and the scan electrode 32, and the first dielectric layer 24 and the second dielectric layer 25 formed on the first dielectric layer 24. And a third dielectric layer 26 formed on the second dielectric layer 25.

The first and second dielectric layers 24 and 25 are colored in a first color, and the third dielectric layer 26 forms the colored portion 27 to be colored in a second color. This coloring part 27 is formed in the same pattern as the pattern of the partition 26 (refer FIG. 4).

In addition, since the first and second dielectric layers 24 and 25 formed on the front substrate 20 are colored in a first color, that is, blue, there is an effect of improving the color temperature while having the same black ratio in the entire plasma display panel.

Since the partition 16 is formed of the first partition member 16a and the second partition member 16b, the colored portion 27 is formed of the first colored portion 27a and the second colored portion 27. At this time, the coloring part 27 is formed in the same pattern as the pattern of the 1st partition member 16a and the 2nd partition member 16b.

That is, the first coloring portion 27a is formed along the y-axis direction correspondingly on the first partition wall member 16a. The second colored portion 27b crosses the first colored portion 27a and is formed along the x-axis direction correspondingly on the second partition members 16b.

In addition, when the partition wall 16 is formed of only the first partition members 16a to form the discharge cells in a stripe structure, the coloring part 27 may include first coloring parts corresponding to the first partition wall members 16a ( 27a) only (not shown).

In this embodiment, the colored portion 27 of the matrix structure is illustrated, and when the second colored portion 27b is removed in this state, the colored portion of the stripe structure by the first colored portion 27a is formed. Therefore, a separate illustration of the colored portion of the stripe structure is omitted here.

As such, when the coloring part 27 is formed in the same pattern as the pattern of the partition wall 16, the black part ratio can be maximized without causing the blocking of the visible light by the second color.

As a result, the first color and the second color generate a black part in the non-discharge area corresponding to the partition wall 16 by the complementary color relationship, thereby preventing external light LR without blocking the visible light VR generated in the discharge cell 17. ), And the contrast can be improved while maintaining the brightness.

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 scope of the invention.

As described above, in the plasma display panel according to the present invention, a plurality of dielectric layers are formed on a substrate to which visible light is irradiated, one of which is colored with a first color, and the other one layer has a complementary color relationship with the first color. The branches are colored in a second color, wherein the colored portion colored in the second color is formed corresponding to at least part of the partition wall. Since it does not interfere with the forward transmission of visible light, there is an effect of improving the bright room contrast by improving the black ratio by the subtractive mixing action of the first color and the second color while maintaining the luminance. That is, the plasma display panel of the present invention greatly improves the contrast of the bright room as compared with the decrease in the brightness, thereby improving the quality of the entire panel.

Claims (11)

A first substrate and a second substrate spaced apart from each other; Barrier ribs disposed between the substrates to partition discharge cells; A phosphor layer formed on the discharge cell; An address electrode extending in a first direction corresponding to the discharge cells; First and second electrodes respectively extending and formed in a second direction crossing the first direction to correspond to the discharge cells; And A dielectric layer formed on one of the substrates to which visible light is irradiated; The dielectric layer is formed of at least two layers, Among them, the first layer is colored in the first color, The other one layer includes a coloring unit colored in a second color having a complementary color relationship with the first color, The coloring unit, And a plasma display panel corresponding to at least part of the partition wall. According to claim 1, The dielectric layer is A first dielectric layer formed on the substrate, A second dielectric layer formed on the first dielectric layer and And a third dielectric layer formed on the second dielectric layer. The method of claim 2, And the first color is blue. The method of claim 3, wherein And the second color is brown. The method of claim 2, The first dielectric layer and the second dielectric layer are colored with the first color, And the third dielectric layer is colored in the second color. According to claim 1, The colored display panel is formed in the same pattern as the pattern of the partition wall. According to claim 1, The partition wall, And first partition members extending in the first direction and formed at intervals corresponding to the discharge cells along the second direction. The method of claim 7, wherein And the coloring part is formed in the same pattern as the pattern of the first partition member. The method of claim 7, wherein The partition wall, And second partition members extending in the second direction between the first partition members and formed at intervals corresponding to the discharge cells along the first direction. The method of claim 9, The coloring unit is formed in the same pattern as the pattern of the first partition member and the second partition member plasma display panel. The method of claim 10, The coloring unit, A first coloring part formed on the first partition members along the first direction to correspond to the first partition members; And a second coloring part intersecting the first coloring part and formed along the second direction to correspond to the second partition members.

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