KR20080047868A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to enhance a bright room contrast ratio by representing barrier ribs as black through the coloring of a rear substrate and a dielectric using different colors from each other. A plasma display panel includes first and second substrates(305,21), barrier ribs(521), phosphor layers(19), address electrodes(11), a pair of display electrodes(30), and a dielectric(13). The first substrate is colored by a first color. The second substrate is constantly disposed apart from the first substrate. The barrier ribs are colored by a second color and define discharge cells between the first and second substrates. The phosphor layers are formed in the discharge cells. The address electrodes are formed on the second substrate corresponding to the discharge cells. The display electrodes are formed on the first substrate corresponding to the discharge cells in pairs. The dielectric covers the display electrodes and is formed on the first substrate. The first and second colors have a relation of subtractive mixture.

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>

21,23: second substrate (back substrate) 11: address electrode

707,709,711 dielectric layer 521,523,525 bulkhead

17 discharge cell 19 phosphor layer

305: first substrate (front substrate)

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

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

32: second electrode (scanning electrode)

141,143,145,147: 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 which improves contrast by the effects of subtraction mixing and complementary colors.

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.

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 in that external light is reflected and the contrast of the plasma display panel is lowered, and as a result, the image quality of the plasma display panel is lowered.

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

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

The present invention is to solve the above-described problems, according to one embodiment of the present invention, the front substrate and the rear substrate disposed at a distance from the front substrate and colored in the first color, the front substrate and the rear substrate A partition wall disposed between and partitioning the discharge cells, the partition wall colored in a second color, a phosphor layer formed on the discharge cell, an address electrode formed on the rear substrate corresponding to the discharge cells, and the discharge cell And a display electrode formed of a pair of electrodes on the front substrate and a dielectric layer covering the display electrode and formed on the front substrate, wherein the first color and the second color are in a subtractive mixing relationship. A display panel is provided.

The first color of the back substrate and the second color of the barrier rib may be mixed with each other and may appear to be black (BK) in a complementary color relationship.

The first color of the rear substrate may be colored in blue, the second color of the barrier may be colored in orange, and conversely, the first color of the rear substrate may be colored in orange and the second color of the barrier may be colored in blue. have.

The blue color may be formed to include at least one of manganese (Mn), nickel (Ni), and cobalt (Co), and the orange color may include at least one of copper (Cu), antimony (Sb), and chromium (Cr). It can be formed to have one component.

According to another embodiment of the present invention, colors in which the rear substrate and the front dielectric layer are subtracted and mixed with each other are colored. When two colors of the back substrate and the front dielectric layer are complementary, they are mixed with each other to appear as black (BK). Can be.

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 duplicate descriptions thereof will be omitted.

1 is a perspective view schematically illustrating an exploded view of a plasma display panel according to a first 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 141 according to an embodiment of the present invention may include a first substrate 305 (hereinafter referred to as a “front substrate”) and a first substrate 305. And a second substrate 21 (hereinafter referred to as a "back substrate") disposed at predetermined intervals, and a partition wall 521 provided between the substrates 21 and 305. The space between the back substrate 21 and the front substrate 305 is sealed by a sealing member (not shown). The partition wall 521 is formed at a predetermined height between the rear substrate 21 and the front substrate 305 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 21, and each discharge cell 17 on the front substrate 305. 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 21 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 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 21 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 21 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 521 is actually provided on the dielectric layer 13 to partition the discharge cells 17. The partition wall 521 includes first partition wall members 521a extending in the y-axis direction and second partition wall members 521b extending in the x-axis direction between the first partition wall members 521a. 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 surface of the barrier rib 521 and the surface of the dielectric layer 13 positioned between the barrier ribs 521 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 305, 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 a black electrode layer 31b '32b' that absorbs external light and improves contrast, and a white electrode layer that improves conductivity by complementing the low conductivity of the black electrode layer 31b '32b'. 31b "32b".

 The sustain electrode 31 and the scan electrode 32 cross the address electrodes 11 and are covered with the dielectric layer 707 while facing each other corresponding to the discharge cells 17. The dielectric layer 707 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.

Meanwhile, the plasma display panel of the present embodiment improves black ratio by using a subtractive mixture and complementary color relationship while maintaining brightness, and as a result, bright room contrast ratio is improved. 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 mixed nature and the complementary color will be 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 (Magenta), yellow (Yellow), and cyan (Cyan). In the case of subtractive blending, when two colors in complementary colors are mixed, they become 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 141 according to the exemplary embodiment of the present invention, the rear substrate 21 and the partition wall 521 are colored in two different colors by applying the above-described subtraction mixing and complementary color relationship. That is, the back substrate 21 is colored in the first color, the partition wall 521 is colored in the second color, and the first color and the second color make a subtractive mixing relationship. Meanwhile, the front substrate 305 may be formed of a transparent material, and the dielectric layer 707 may also be transparent.

In particular, when the first color of the rear substrate 21 and the second color of the barrier rib 521 are complementary to each other, they may be mixed with each other to show black color. For example, the back substrate 21 may be colored in orange (O), and the partition wall 521 may be colored in blue (B). Orange (O) of the rear substrate 21 having a complementary color relationship and blue (B) of the partition wall 521 are subtracted and mixed together to become black (BK).

The two colors of the back substrate 21 and the partition wall 521 generate black (BK) portions in the non-discharge area corresponding to the partition wall 521 by subtractive mixing and complementary color relations, thereby blocking visible light generated in the discharge cells 17. It absorbs external light without improving the clear room contrast.

Meanwhile, as described above, the two colors of the rear substrate 21 and the partition wall 521 have a separate black matrix as a black (BK) series part is formed in the non-discharge area corresponding to the partition wall 521 by subtraction mixing and complementary color relationship. Since there is no need to manufacture the manufacturing process has the advantage of reducing the number.

3 is a cross-sectional view illustrating plasma display panels 143 according to a second embodiment of the present invention.

Referring to FIG. 3, the back substrate 23 may be colored in orange (O), and the partition wall 523 may be colored in blue (B).

4 and 5 are cross-sectional views illustrating the plasma display panels 145 and 147 according to the third and fourth embodiments of the present invention, respectively. Instead of coloring the partition walls, the partitions are colored by subtractive mixing and complementary color by coloring the dielectric layers. The structure which makes it look like black (BK) series is shown.

Referring to FIG. 4, the dielectric layer 709 may be colored orange (O), and the back substrate 21 may be colored blue (B). In this case, the front substrate 305 and the partition wall 525 are formed to be transparent.

Referring to FIG. 5, the dielectric layer 711 may be colored blue (B), and the back substrate 23 may be colored orange (O). In this case, the front substrate 305 and the partition 525 are also transparent.

As described above, the color arrangement in which the partition portion is displayed as a black (BK) series by subtraction mixing and complementary color relations is only an example, and various color arrangements are possible.

In the above configurations, materials such as copper (Cu), antimony (Sb), and chromium (Cr) may be added to form orange (O), and manganese (Mn) and nickel to form blue (B). Materials such as (Ni) and cobalt (Co) can be added.

Table 1 compares the relationship between bright room contrast and external light reflectance due to the effect of subtractive mixing and complementary color when the back substrate and the partition wall are colored blue and orange, respectively (first embodiment).

Conventional First embodiment Real room contrast 70: 1 92: 1 External light reflectance (cd / m ² ) 15.2 10.8

In addition, Table 2 compares the relationship between bright room contrast and external light reflection luminance due to the effect of subtractive mixing and complementary color when the back substrate and the dielectric layer are colored in blue and orange (third example), respectively.

Conventional Third embodiment Real room contrast 70: 1 90: 1 External light reflectance (cd / m ² ) 15.2 10.9

As can be seen from the above [Table 1] and [Table 2], through the embodiments of the present invention, the bright room contrast is significantly improved as compared with the prior art, and the external light reflection luminance is greatly reduced to confirm that the emotional image quality is greatly improved. Can be.

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, the rear substrate and the partition wall are colored in different colors, or the rear substrate and the dielectric layer are colored in different colors, and the partition wall portion is black (BK) based on subtractive mixing and complementary colors. In addition to improving the bright room contrast, there is an advantage of greatly reducing the external light reflection luminance to greatly improve 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 contrast enhancement.

Claims (12)

A first substrate; A second substrate disposed at intervals from the first substrate and colored in a first color; A partition wall disposed between the first substrate and the second substrate to partition discharge cells and colored in a second 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 first substrate; And the first color and the second color are in a subtractive mixing relationship. The method of claim 1, And a first color of the second substrate and a second color of the partition wall, which are mixed with each other and appear black. The method of claim 2, And a first color of the second substrate is colored blue, and a second color of the barrier rib is colored orange. The method of claim 2, And a first color of the second substrate is colored orange, and a second color of the barrier rib is colored blue. The method according to claim 3 or 4, The blue is a plasma display panel formed of at least one of manganese (Mn), nickel (Ni), cobalt (Co). The method according to claim 3 or 4, The orange is a plasma display panel formed of at least one of copper (Cu), antimony (Sb), chromium (Cr). A first substrate; A second substrate spaced from the first substrate and colored in a first color; Barrier ribs disposed between the first substrate and the second substrate to partition discharge cells; Phosphor layers formed on the discharge cells; 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 on the first substrate and colored in a second color; And And the first color and the second color are subtractive mixed. The method of claim 7, wherein And a first color of the second substrate and a second color of the dielectric layer are mixed with each other to appear black. The method of claim 8, And a first color of the second substrate is colored blue, and a second color of the dielectric layer is colored orange. The method of claim 8, And a first color of the second substrate is colored orange and a second color of the dielectric layer is colored blue. The method of claim 9 or 10, The blue is a plasma display panel formed of at least one of manganese (Mn), nickel (Ni), cobalt (Co). The method of claim 9 or 10, The orange is a plasma display panel formed of at least one of copper (Cu), antimony (Sb), chromium (Cr).

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