KR20080043535A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to improve bright room contrast and to reduce external light luminance by coloring a front substrate, a dielectric layer, and a barrier rib with different colors, or the dielectric layer, a protective layer, and the barrier rib with the different colors. A rear substrate(10) is colored with a predetermined color. A front substrate(301) is arranged away from the first substrate. A barrier rib(511) is arranged between the rear and front substrates to divide discharge cells(17). The barrier rib is colored with a predetermined color. A fluorescent substance layer(19) is formed on the discharge cell. An address electrode(11) is formed on the front substrate corresponding to the discharge cells. A display electrode(30) comprised of a pair of electrodes is formed on the front substrate corresponding to the discharge cells. A dielectric layer(13) covers the display electrode and is formed on the whole rear substrate. The dielectric layer is colored with a predetermined color. Three colors of the rear substrate, the barrier rib, and the dielectric layer are mixed in a subtractive color mixture to configure a complementary 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 a first embodiment of the present invention;

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

3 is a cross-sectional view according to a second embodiment of the present invention;

4 is a cross-sectional view according to a third embodiment of the present invention, and

5 is a cross-sectional view according to a fourth embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

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

701,703,705: Dielectric layer 511,513: Bulkhead

17 discharge cell 19 phosphor layer

20: second substrate (front substrate) 901: protective layer

30: display electrode 31: first electrode (holding electrode)

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

32: second electrode (scanning electrode)

121,123,125,127: Plasma Display Panel

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 for improving luminance by subtractive mixing and complementary color effects.

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. .

In the conventional plasma display panel as described above, the dielectric layer covering the front substrate and the display electrode is formed of a white transparent material, and the partition wall is also made of white. Accordingly, there is a problem that the external light is reflected and the luminance of the panel is lowered in the plasma display, and as a result, the image quality of the plasma display panel is lowered.

On the other hand, conventionally, there is a problem in that the number of manufacturing processes is increased by forming a separate black stripe layer in order to reduce the reflected light to improve the contrast ratio.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display panel which improves bright room contrast ratio by making the partition wall look black (BK) with a complementary color effect while maintaining the luminance.

Another object of the present invention is to provide a plasma display panel which makes the partition wall appear black (BK) due to the complementary color effect, thereby eliminating a separate black stripe layer manufacturing process.

The present invention is to solve the above problems, according to one embodiment of the present invention, the first substrate colored in a predetermined color; A second substrate disposed at a predetermined distance from the first substrate; A partition wall disposed between the first and second substrates to partition discharge cells and colored in a predetermined color; A phosphor layer formed on the discharge cell; An address electrode formed on the second substrate corresponding to the discharge cells; A display electrode formed as a pair of electrodes on the first substrate corresponding to the discharge cells; And a dielectric layer covering the display electrode and formed over the first substrate and colored in a predetermined color, wherein the three colors of the first substrate, the partition, and the dielectric layer are subtracted and mixed to form a complementary color. This is provided.

Two colors of the three colors of the first substrate, the barrier ribs, and the dielectric layer may be mixed with the other one, and the other color may be displayed as black (BK).

The first substrate may be colored in purple (M), the barrier rib may be colored in cyan (C), and the dielectric layer may be colored in yellow (Y).

The first substrate may be colored in cyan (C), the barrier rib may be colored in purple (M), and the dielectric layer may be colored in yellow (Y).

According to another embodiment of the invention, the first substrate; A second substrate disposed at a predetermined distance from the first substrate; A partition wall disposed between the first and second substrates to partition discharge cells and colored in a predetermined color; A phosphor layer formed on the discharge cell; An address electrode formed on the second substrate corresponding to the discharge cells; A display electrode formed as a pair of electrodes on the first substrate corresponding to the discharge cells; A dielectric layer covering the display electrode and formed over the first substrate and colored in a predetermined color; And a protective layer formed on the dielectric layer and colored in a predetermined color, wherein the three colors of the first substrate, the dielectric layer, and the protective layer are subtracted and mixed to form a complementary color.

Two of the three colors of the barrier rib, the dielectric layer, and the protective layer may be mixed with each other, and the other color may be mixed to appear as black (BK).

The partition wall may be colored in cyan (C), the dielectric layer may be colored in purple (M), and the protective layer may be colored in yellow (Y).

The partition wall may be colored purple (M), the dielectric layer may be colored cyan (C), and the protective layer may be colored yellow (Y).

The protective layer may be an MgO layer.

In the above embodiments, the purple (M) may be formed of any one of chromium (Cr), bismuth (Bi).

In addition, the yellow (Y) may be formed of any one of copper (Cu) and antimony (Sb).

In addition, the cyan (C) may be formed of any one of manganese (Mn), nickel (Ni), cobalt (Co).

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 for clarity, and like reference numerals designate like elements throughout the specification, and redundant descriptions thereof will be omitted.

1 is a perspective view schematically illustrating an exploded view of a plasma display panel 121 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.

1 and 2, a plasma display panel 121 according to an exemplary embodiment of the present invention may include a first substrate 10 (hereinafter referred to as a “back substrate”) and the first substrate 10. A second substrate 301 (hereinafter referred to as a "front substrate") disposed at a predetermined interval and a partition wall 511 provided between the substrates 10 and 301 are included. The space between the back substrate 10 and the front substrate 301 is sealed by a sealing member (not shown). The partition wall 511 is formed at a predetermined height between the rear substrate 10 and the front substrate 301 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)) so as to generate vacuum ultraviolet rays by gas discharge. The discharge cells 17 absorb the vacuum ultraviolet rays and display visible light. A phosphor layer 19 emitting light is provided.

In order to implement an image by gas discharge, the plasma display panel includes an address electrode 11 corresponding to each discharge cell 17 on the rear substrate 10, and each discharge cell 17 on the front substrate 301. In order to correspond to the display electrode 30, a pair of first electrodes (hereinafter referred to as "hold electrodes") 31 and second electrodes (hereinafter referred to as "scan electrodes") 32 are provided.

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 continuously correspond to discharge cells 17 adjacent in the y-axis direction. do. In addition, the plurality of address electrodes 11 are arranged side by side to correspond to adjacent discharge cells 17 in a second direction (the x-axis direction in the drawing) crossing 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 wall 511 is actually provided on the dielectric layer 13 to partition the discharge cells 17. The partition wall 501 includes first partition wall members 511a extending in the y-axis direction and second partition wall members 511b extending in the x-axis direction between the first partition wall members 511a. 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.

The phosphor layer 19 formed in each of the discharge cells 17 is coated with a phosphor paste on the side of the barrier rib 511 and the surface of the dielectric layer 13 positioned between the barrier ribs 511, and dried and fired. It is formed by.

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, the sustain electrode 31 and the scan electrode 32 constituting the display electrode 30 are provided on the inner surface of the front substrate 301, 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. The transparent electrodes 31 a and 32 a are portions which cause surface discharge in 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 transparent electrodes 31a and 32a form surface discharge structures with each of the widths W31 and W32 about the center 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. Here, the bus electrodes 31b and 32b have black electrode layers 31b and 32b for absorbing external light and improving contrast, and the white electrode layer 31b for improving the conductivity by complementing the low conductivity of the black electrode layers 31b and 32b. , 32b).

 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 corresponding to 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.

During the driving of the plasma display panel, a reset discharge is generated by a reset pulse applied to the scan electrode 31 in the reset period, and to the scan pulse and the address electrode 11 applied to the scan electrode 32 in the addressing period following the reset period. The address discharge is caused by the address pulse applied, and then the sustain discharge is caused 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 a sustain pulse required for sustain discharge, and the scan electrode 32 serves as an electrode for applying a reset pulse and a scan pulse, and the address electrode ( 11 serves as an electrode for applying an address pulse. Since the sustain electrode 31, the scan electrode 32, and the address electrode 11 may have different roles depending on voltage waveforms applied to the sustain electrodes 31, the scan electrodes 32, and the address electrodes 11, they are not necessarily limited to these roles.

The plasma display panel selects the discharge cells 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 improves black fraction by using a subtractive mixture and complementary color relationship while maintaining brightness, and consequently, improves clear contrast. The black fraction refers to the ratio occupied by black (BK), and the higher the black fraction, the brighter the contrast is. At this time, of course, the discharge cell 17 is blocked by the black (BK) part should be avoided. The bright room contrast refers to the contrast ratio in bright places. When the bright room contrast is improved, the image can be easily seen even in bright places.

Here, the subtractive mixing properties and the complementary color will be briefly described.

The color of the paint changes to a darker color as it is mixed, which is called a subtractive mixture. In the paint, the three primary colors are purple (M) (Magenta), yellow (Y) (Yellow), and cyan (C) (Cyan). In the case of subtractive blending, if two colors in complementary colors are mixed, they are achromatic (gray or black). ) Complementary color combinations are numerous, including red and cyan, yellow and indigo, blue and orange. Subtractive mixing decreases the brightness and saturation as it is mixed, making it closer to gray, and mixing of complementary colors is closer to black (BK).

In the plasma display panel 121 according to the exemplary embodiment, the front substrate, the partition wall, and the dielectric layer are colored in three different colors by applying the above-described subtraction mixing and complementary color relationships.

The three colors of the front substrate 301, the partition 511, and the dielectric layer 701 have a complementary color relationship of black (BK) by dark blue mixing. For example, the front substrate 301 may be colored purple (M), the partition 511 may be colored cyan (C), and the dielectric layer 701 may be colored yellow (Y).

In such a case, the purple (M) of the front substrate 301 and the yellow (Y) of the dielectric layer 701 are mixed to become red (R: Red), and the red (R) is complementary to the partition wall 511. It is mixed with cyan color (C) of and becomes black (BK: Black).

The three colors of the front substrate 301, the partition 511, and the dielectric layer 701 generate black portions in the non-discharge regions corresponding to the partition 511 by subtractive mixing and complementary color relations, thereby generating visible light generated in the discharge cells 17. Absorbs external light without blocking, improving clear room contrast.

Meanwhile, as described above, the three colors M, Y, and C of the front substrate 301, the dielectric layer 701, and the partition wall 511 are black in the non-discharge area corresponding to the partition wall 511 due to subtraction mixing and complementary color relations. As the addition occurs, there is no need to fabricate a separate black matrix, thereby reducing the number of manufacturing processes.

3 is a cross-sectional view illustrating a plasma display panel 123 according to another embodiment of the present invention.

Referring to FIG. 3, the front substrate 303 may be colored in cyan (C), the dielectric layer 701 may be colored in yellow (Y), and the partition wall 513 may be colored in purple (M).

4 and 5 are cross-sectional views illustrating plasma display panels 125 and 127 according to still another embodiment of the present invention. The plasma display panels 125 and 127 have a front substrate that is transparent and a protective layer colored in a predetermined color on a dielectric layer. A layer is added. The protective layer is formed of transparent MgO to protect the dielectric layer, increasing the secondary electron emission coefficient upon discharge

Referring to FIG. 4, the front substrate 305 is formed of transparent white, the dielectric layer 703 is colored purple (M), the protective layer 901 is colored yellow (Y), and the partition wall 511 is formed. It may be colored cyan (C).

Referring to FIG. 5, the front substrate 305 is formed of transparent white, the dielectric layer 705 is colored in cyan (C), the protective layer 901 is colored in yellow (Y), and the partition wall 513 is formed. It may be colored purple (M).

As described above, the color arrangement for making the partition part appear black by subtraction mixing and complementary color relationship is only an example, and various color arrangements are possible.

In the above-described configurations, materials such as chromium (Cr) and bismuth (Bi) may be added to form purple (M), and copper (Cu) and antimony (Sb) to form yellow (Y). Materials may be added, and materials such as manganese (Mn), nickel (Ni), cobalt (Co) may be added to form cyan (C).

Table 1 compares the relationship between bright room contrast and external light reflectance due to subtractive mixing and complementary colors when the front substrate, the dielectric layer, and the partition wall are colored in three different primary colors.

Conventional The present invention Real room contrast 70: 1 93: 1 External light reflectance (cd / m ² ) 15.2 10.2

In addition, Table 2 compares the relationship between bright room contrast and external light reflectance due to the effect of subtractive mixing and complementary color when the dielectric layer, the protective layer, and the partition wall are colored with three different primary colors.

Conventional The present invention Real room contrast 70: 1 93: 1 External light reflectance (cd / m ² ) 15.2 10.7

As can be seen from Tables 1 and 2, the contrast of the bright room is greatly improved as compared to the prior art through the embodiments of the present invention, and the external light reflection luminance is greatly reduced to improve the emotional image quality.

As described above, in the plasma display panel according to the present invention, the front panel, the dielectric layer and the partition wall are colored in different colors, or the dielectric layer, the protective layer and the partition wall are colored in different colors, and the partition wall is black by subtractive mixing and complementary color relationship. In addition to improving the bright room contrast, there is an advantage of greatly reducing the external light reflection luminance, thereby greatly improving the emotional image quality.

In addition, there is an advantage that the production cost is reduced and the process is reduced by not manufacturing a separate black matrix for improving 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.

Claims (14)

A first substrate colored in a predetermined color; A second substrate disposed at a predetermined distance from the first substrate; A partition wall disposed between the first and second substrates to partition discharge cells and colored in a predetermined color; A phosphor layer formed on the discharge cell; An address electrode formed on the second substrate corresponding to the discharge cells; A display electrode formed as a pair of electrodes on the first substrate corresponding to the discharge cells; And A dielectric layer covering the display electrode and formed on the entire first substrate and colored in a predetermined color; And three colors of the first substrate, the partition, and the dielectric layer are subtracted and mixed to form a complementary color. According to claim 1, 2. The plasma display panel of claim 1, wherein two colors of the first substrate, the barrier ribs, and the dielectric layer are mixed with each other, and the other color is mixed to appear as black (BK). The method of claim 2, The first substrate is colored in purple (M), the partition wall is colored in cyan (C), and the dielectric layer is colored in yellow (Y). The method of claim 2, The first substrate is colored in cyan (C), the partition is colored in purple (M), and the dielectric layer is colored in yellow (Y). The method according to claim 3 or 4, The purple (M) is a plasma display panel formed of any one of chromium (Cr), bismuth (Bi). The method according to claim 3 or 4, The yellow (Y) is formed of any one of copper (Cu) and antimony (Sb) plasma display panel. The method according to claim 3 to 4, The cyan (C) is formed of any one of manganese (Mn), nickel (Ni), cobalt (Co). A first substrate; A second substrate disposed at a predetermined distance from the first substrate; A partition wall disposed between the first and second substrates to partition discharge cells and colored in a predetermined color; A phosphor layer formed on the discharge cell; An address electrode formed on the second substrate corresponding to the discharge cells; A display electrode formed as a pair of electrodes on the first substrate corresponding to the discharge cells; A dielectric layer covering the display electrode and formed over the first substrate and colored in a predetermined color; And A protective layer formed on the dielectric layer and colored in a predetermined color Including And three colors of the first substrate, the dielectric layer, and the protective layer are subtracted and mixed to form a complementary color. The method of claim 8, 2. The plasma display panel of claim 3, wherein two of the three colors of the barrier rib, the dielectric layer, and the protective layer are mixed with each other, and the other one is mixed with the black. The method of claim 9, The barrier rib is colored in cyan (C), the dielectric layer is colored in purple (M), and the protective layer is colored in yellow (Y). The method of claim 9, The barrier rib is colored in purple (M), the dielectric layer is colored in cyan (C), and the protective layer is colored in yellow (Y). The method according to claim 10 or 11, wherein The purple (M) is a plasma display panel formed of any one of chromium (Cr), bismuth (Bi). The method according to claim 10 or 11, wherein The yellow (Y) is formed of any one of copper (Cu) and antimony (Sb) plasma display panel. The method according to claim 10 or 11, wherein The cyan (C) is formed of any one of manganese (Mn), nickel (Ni), cobalt (Co).

Images