KR100728116B1 - Plasma display penel - Google Patents

Abstract

A plasma display panel is provided to maintain uniform white balance and color temperature by forming openings on a transparent electrode correspondent to a red, green or blue discharge cell. A first substrate(10) and a second substrate(20) are arranged to be opposite each other. Plural discharge cells(18R,18G,18B) are divided by a partition(13) in a space between the first and second substrates. Red, green, and blue fluorescent substance layers are respectively formed in the discharge cell. An address electrode(11) is stretched to a first direction, corresponding to the discharge cells where the red, green, and blue fluorescent substance layers are formed. A pair of display electrodes(50) are stretched to a second direction crossing the address electrode. The display electrodes are formed by corresponding to the discharge cells. The display electrodes include bus electrode(31,41) and transparent electrodes(32,42). The bus electrodes are formed along the partition. The transparent electrodes are formed to be stretched to the second direction. The transparent electrodes have a width from the bus electrodes to centers of the discharge cells. Opening units(S) are formed on the transparent electrode, corresponding to each discharge. On the opening unit, the volume corresponding to at least one of the discharge cells is larger than the volume corresponding to other discharge cell.

Description

Plasma Display Panel {PLASMA DISPLAY PENEL}

1 is a partially exploded perspective view illustrating a plasma display panel according to a first embodiment of the present invention.

FIG. 2 is a partial side cross-sectional view taken along line II-II by combining the plasma display panel shown in FIG.

3 is a planar cross section of a plasma display panel according to a first embodiment of the present invention.

4 is a plan sectional view of a plasma display panel according to a second embodiment of the present invention.

5 is a plan sectional view of a plasma display panel according to a third embodiment of the present invention.

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 capable of improving the brightness of a panel and equalizing discharge characteristics of respective discharge cells.

As is well known, the plasma display panel is a red (R), green (G), blue (B) generated by exciting the phosphor using a vacuum ultra-violet (VUV) emitted from the plasma obtained by the gas discharge ) A display device for realizing an image with visible light of color.

This plasma display panel (hereinafter referred to as "PDP") is most commonly an AC type three-electrode surface discharge structure. The PDP of this AC type three-electrode surface discharge structure includes a front substrate and a rear substrate, and is formed by enclosing the front substrate and the rear substrate with the discharge gas filled between the two substrates.

BACKGROUND OF THE INVENTION A plasma display panel is a display device for realizing an image by exciting phosphors by vacuum ultraviolet rays caused by gas discharge occurring in a discharge cell, and has been spotlighted as a next-generation thin display device because a large resolution can be configured.

Such PDPs are roughly classified into alternating current, direct current type, and mixed type, and it is common to use an alternating current three-electrode surface discharge structure.

In the three-electrode surface discharge structure of the AC type, an address electrode, a partition wall, and a fluorescent layer are formed on a rear substrate corresponding to each discharge cell, and a discharge holding electrode formed of a scan electrode and a display electrode is formed on a front substrate. The inside of the divided discharge cell is filled with discharge gas (Ne-Xe mixed gas).

Accordingly, when a discharge cell for emitting light is selected by applying a signal to the address electrode and the scan electrode, and a voltage of 150 to 200 V is applied between the scan electrode and the display electrode, the discharge gas causes plasma discharge, From the excitation reactor, vacuum ultraviolet rays having wavelengths of 147 nm, 150 nm and 173 nm are emitted. And this vacuum ultraviolet-ray excites fluorescent substance and converts it into visible light, and color expression is attained.

In such a PDP, a loss occurs in various stages, from input power input to the driving circuit to display light that passes through the front substrate and reaches the viewer.

The luminous efficiency of PDP is based on circuit efficiency due to circuit loss, discharge efficiency when discharge power is converted into ultraviolet light, ultraviolet light utilization when ultraviolet light is converted into effective ultraviolet light, and phosphor efficiency when effective ultraviolet light is converted into visible light. And the sum of the visible light utilization when the visible light is converted into the display light.

Therefore, many efforts have been made to minimize the losses in each of the above-described steps when designing and manufacturing the PDP, and the efficiencies in the remaining steps except circuit efficiency are mainly the internal structure and material properties of the PDP, in particular, the structure of the discharge cell. And because of the great influence on the material properties of the discharge gas and the phosphor, many researches on this.

On the other hand, since the phosphor used for PDP has to be excited with low energy compared to the phosphor used for cathode ray tube, the choice is limited. There is a disadvantage that the brightness difference is severe.

Therefore, a difference occurs in phosphor efficiency and discharge characteristics for each of the red, green, and blue discharge cells, and it is difficult to adjust the white balance and the color temperature.

The present invention is to solve the above problems, an object of the present invention is to improve the luminance of the panel and to uniform the discharge characteristics and luminous efficiency of each discharge cell for the red, green and blue phosphors to equalize the white balance of the panel To provide a plasma display panel that can improve the color temperature adjustment.

In order to achieve the above object, a plasma display panel of the present invention includes a first substrate and a second substrate disposed to face each other, and a plurality of discharge cells partitioned by partition walls in a space between the first substrate and the second substrate. Red, green, and blue phosphor layers formed in the discharge cells, address electrodes formed in the first direction and corresponding to red, green, and blue discharge cells, respectively; A pair of display electrodes extending in a second direction crossing each other and corresponding to discharge cells of red, green, and blue colors, wherein the display electrodes include a bus electrode formed along a partition wall, and a discharge cell from the bus electrode. And a transparent electrode extending in a second direction with a width at the center of the center, wherein the transparent electrode forms an opening in at least one of the discharge cells of red, green, and blue colors. It includes.

The opening may correspond to the red discharge cell. The openings may correspond to the discharge cells of red, green, and blue colors, respectively.

The opening may have an area corresponding to at least one of the discharge cells of red, green, and blue colors larger than the area corresponding to the discharge cells of other colors.

The opening may have an area corresponding to the red discharge cells larger than the area corresponding to the green and blue discharge cells.

The opening may have a larger area corresponding to the green discharge cell than an area corresponding to the blue discharge cell.

The opening may be formed such that the area corresponding to the green discharge cell has the same area as the area corresponding to the blue discharge cell.

The opening may be formed in a quadrangular shape, and one side of the discharge cells of at least one color may have a different length from one side of the discharge cells of different colors with respect to the discharge cells of red, green, and blue colors.

The openings may have different widths in the second direction in each of the discharge cells of red, green, and blue colors.

The width of the opening may satisfy d _R > d _G ≥ d _B, where d _R is the second direction width of the opening for the red discharge cell and d _G is the second direction width of the opening for the green discharge cell. And d _B is the width in the second direction of the opening with respect to the blue discharge cell.

The openings may have different widths in the first direction with respect to each of the discharge cells of red, green, and blue colors.

The width of the opening may satisfy h _R > h _G ≥ h _B , where h _R is the first direction width of the opening for the red discharge cell and h _G is the first direction width of the opening for the green discharge cell. , h _B is the width in the first direction of the opening with respect to the blue discharge cell.

 The transparent electrode may be formed in a continuous stripe shape along the bus electrode.

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 to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

1 is a partially exploded perspective view illustrating a plasma display panel according to a first embodiment of the present invention.

Referring to FIG. 1, the plasma display panel according to the present exemplary embodiment basically includes a first substrate 10 (hereinafter referred to as a "back substrate") and a second substrate 20 (hereinafter referred to as a "front substrate"). The discharge cells 18R, 18G, and 18B are partitioned by the partition wall 13 in the space between the rear substrate 10 and the front substrate 20 with the predetermined intervals interposed therebetween.

In the present exemplary embodiment, the partition wall 13 is formed by coating the dielectric on the back substrate 10, patterning the same, and baking the same to form a separate layer from the back substrate 10. The partition wall 15 has a longitudinal partition wall 15a formed long in a first direction (y direction in the drawing), and a horizontal partition wall formed long in a second direction (x direction in the drawing) orthogonal to the vertical partition wall 15a. (15b). Therefore, the discharge cells 18R, 18G, and 18B partitioned by the vertical partition walls 15a and the horizontal partition walls 15b are partitioned in the form of a "metrics" pattern.

However, the plasma display panel of the present invention is not necessarily limited thereto, and the discharge cells 18R, 18G, and 18B partitioned by the partition wall may have various shapes, such as a "stripe" or "duller" pattern, in addition to the "metrics" pattern described above. Naturally, it can be partitioned.

The address electrode 50 is formed along the first direction on the rear substrate 10 to correspond to all of the discharge cells 18R, 18G, and 18B, and the front substrate 20 has a cross that intersects the address electrodes 50. A pair of display electrodes 50 are formed along two directions. Therefore, the address electrode 11 and the pair of display electrodes 50 select the discharge cells 18 to be turned on through the address discharge, and then display the image through the sustain discharge.

Each of the discharge cells 18R, 18G, and 18B disposed along the second direction parallel to the display electrode 50 has red, green, and blue phosphors that absorb visible ultraviolet rays and emit visible light. Are applied sequentially and repeatedly.

In addition, red, green, and blue color discharge cells 18R, 18G, and 18B are filled with discharge gases (eg, mixed gases including xenon, neon, and the like) to cause plasma discharge. .

FIG. 2 is a partial side cross-sectional view taken along line II-II by combining the plasma display panel shown in FIG.

Referring to FIG. 2, the lower dielectric layer 13 covering the address electrode 11 may be disposed on the back substrate 10 provided with the address electrode 11 to prevent damage during plasma discharge and to facilitate charge accumulation. Is formed.

The display electrode 50 is a pair of scan electrodes 30 formed parallel to each other along a second direction crossing the address electrode 11 on the front substrate 20 surface facing the rear substrate 10 and It consists of the sustain electrode 40.

An upper dielectric layer 21 is formed to cover the scan electrode 30 and the sustain electrode 40. The upper dielectric layer 21 is formed on the upper dielectric layer 21 to prevent damage due to exposure to plasma discharge occurring in the discharge cell 18. The protective film 23 is formed.

The protective film 23 may be formed of a visible light transmissive MgO film that protects the upper dielectric layer 21 and has a high secondary electron emission coefficient, thereby further lowering the discharge start voltage.

The scan electrode 30 and the sustain electrode 40 each have a width from the bus electrodes 31 and 41 extending along the horizontal partition wall 15b and the discharge cells 18 from the bus electrodes 31 and 41. The bus electrodes 32 and 42 extend in the second direction.

The bus electrodes 31 and 41 are made of an opaque metal material having good electrical conductivity. The bus electrodes 31 and 41 are arranged on both side partition walls 15b disposed with the discharge cells 18 therebetween so as to increase the transmittance of visible light generated in the discharge cells 18 by plasma discharge. It is preferable to be installed adjacently, and furthermore, the bus electrodes 31 and 41 may be provided along the horizontal partition wall 15b.

These transparent electrodes 32 and 42 consist of transparent ITO electrodes which can prevent visible light from being blocked. In the present exemplary embodiment, the transparent electrodes 32 and 42 are disposed on the red, green, and blue discharge cells 18R, 18G, and 18B in the second direction along the bus electrodes 31 and 41 on the front substrate 20. Correspondingly extending in the form of a "stripe". However, the present invention is not necessarily limited thereto, and the transparent electrodes 32 and 42 may correspond to the red, green, and blue discharge cells 18R, 18G, and 18B, and may be formed to protrude individually.

 The transparent electrodes 32 and 42 are formed with openings S having a predetermined opening area for the discharge cells 18R, 18G, and 18B of red, green, and blue colors. The opening S increases the transmittance of visible light to the discharge cells 18R, 18G, and 18B in red, green, and blue colors, thereby improving the luminance of the panel. Therefore, the power consumption required for driving the panel can be further reduced.

The openings S have different opening areas so as to have uniform discharge characteristics for the discharge cells 18R, 18G, and 18B of red, green, and blue colors. Accordingly, the white balance and the color temperature can be controlled by uniformizing the discharge characteristics of the red, green, and blue phosphors corresponding to each discharge cell.

3 is a planar cross section of a plasma display panel according to a first embodiment of the present invention.

Referring to FIG. 3, the openings S of the transparent electrodes 32 and 42 according to the present exemplary embodiment may have opening areas corresponding to green and blue discharge cells (hereinafter referred to as "green opening area S _G ") and The opening area corresponding to the red discharge cell (hereinafter referred to as the "red opening area S _R ") is formed larger than the "blue opening area S _B "). The green opening area S _G may be larger than or equal to the blue opening area S _B.

The shape of the opening S of the present embodiment is formed in a square shape so as to match the discharge cells 18 having a matrix shape. This is because the bus electrodes 32 and 42, which are substantially involved in sustaining discharge, are spread out at the edges of the discharge space in the form of a rectangular ring having an opening S formed therein to diffuse the discharge, thereby improving discharge characteristics and thus reducing power consumption. Make sure

Therefore, the area of each opening S for each of the openings S of the discharge cells 18 of red, green, and blue colors is equal in width to the first direction (hereinafter referred to as “height h”). And different widths (hereinafter, referred to as "width (d _R , d _G , d _B )") in the second direction to form different areas S _R , S _G , and S _B.

At this time, the height of each opening for the discharge cells 18R, 18G, and 18B of red, green, and blue colors is constant, and the width is d _R > d _G ≥ d _B. After all the red, green, and blue colors of the discharge cells (18R, 18G, 18B) area of the opening is on the S _R> S _G ≥S _B.

Accordingly, the white balance may be adjusted by maintaining the color temperature by uniformly discharging the discharge characteristics of the discharge cells 18R, 18G, and 18B corresponding to the fluorescent layers of red, green, and blue colors.

DETAILED DESCRIPTION OF EMBODIMENTS Hereinafter, other embodiments of the present invention will be described with reference to the accompanying drawings, and the same or similar parts as those of the first embodiment described above will be denoted by the same reference numerals, and repeated descriptions thereof will be omitted.

4 is a plan sectional view of a plasma display panel according to a second embodiment of the present invention.

Referring to FIG. 4, in the plasma display panel of the present embodiment, the scan electrodes 130 and the transparent electrodes 132 and 142 of the sustain electrode 140 constituting the display electrode 150 discharge red, green, and blue. The width d of each opening S for the cells 18R, 18G, 18B is formed with d _R > d _G ≥ d _{B and the} height is h _R > h _G ≥ h _B , resulting in red, green, blue the area of the opening for the discharge of a color cell (18R, 18G, 18B) will be such that _R s> s _G ≥S _B.

Of course, by forming at least one side of the width (d) and the height (h) of the opening (S) different from each other for the red, green, blue color discharge cells 18R, 18G, 18B different openings (S) ) To maintain a uniform discharge characteristic for these discharge cells 18R, 18G, and 18B to maintain color temperature and white balance.

5 is a plan sectional view of a plasma display panel according to a third embodiment of the present invention.

Referring to FIG. 5, the plasma display panel according to the present exemplary embodiment forms openings S _R in the transparent electrodes 232 and 242 corresponding to the red discharge cells 18R in comparison with the first and second embodiments. .

Therefore, the white balance and the color temperature can be adjusted by maintaining the discharge characteristics of the red, green, and blue discharge cells 18R, 18G, and 18B uniformly, and the effect of the shape change can be minimized to increase the effect. have.

As in the first, second and third embodiments described above, the shape of the opening S is formed in a square shape corresponding to the shape of the discharge cells 18R, 18G, and 18B of red, green, and blue colors. The transparent electrode is formed in the same rectangular shape as that of the discharge cell so that the accumulation of charge necessary for discharge is evenly formed at the edge of the discharge cell.

 However, the shape of the opening S of the present invention is not necessarily limited to a quadrangle, and the shape of the opening S may be larger than that of the red, green, and blue discharge cells 18R, 18G, and 18B. Naturally, it can be formed into various polygons and circles.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

As described above, in the plasma display panel according to the present invention, openings having different areas are formed in the transparent electrodes for each discharge cell, thereby uniformizing the discharge characteristics of the respective phosphors, thereby maintaining a constant white balance and color temperature. It has the effect of reducing and increasing the transmittance of visible light.

Claims (13)

A first substrate and a second substrate disposed to face each other, A plurality of discharge cells partitioned by partition walls in a space between the first substrate and the second substrate, Phosphor layers of red, green, and blue colors respectively formed in the discharge cells; An address electrode corresponding to the red, green, and blue color discharge cells in which the red, green, and blue color phosphor layers are formed and extending in a first direction, and A pair of display electrodes extending in a second direction crossing the address electrode and corresponding to the red, green, and blue discharge cells; The display electrode may include a bus electrode formed along the partition wall and a transparent electrode extending from the bus electrode toward the center of the discharge cells and extending in the second direction. The transparent electrode corresponds to each of the red, green, and blue discharge cells, and an opening is formed. And the opening is formed to have a larger area corresponding to discharge cells of at least one of the red, green, and blue color discharge cells than an area corresponding to the discharge cells of other colors. delete delete delete The method of claim 1, And the opening is formed such that an area corresponding to the red discharge cells is larger than an area corresponding to the green and blue discharge cells. The method of claim 5, And the opening is formed such that an area corresponding to the green discharge cell is larger than an area corresponding to the blue discharge cell. The method of claim 5, And the opening is formed such that the area corresponding to the green discharge cell has the same area as the area corresponding to the blue discharge cell. The method of claim 1, The opening is formed in a quadrangle, and the plasma display panel is formed so that one side of the discharge cells of at least one color has a different length from one side of the discharge cells of the other color with respect to the discharge cells of the red, green, and blue colors. The method of claim 8, The openings have different widths in the second direction in the discharge cells of the red, green, and blue colors, respectively. The method of claim 9, The width of the opening is d _R> d _G ≥d _B, a plasma display panel which satisfies. Here, d _R is the second direction width of the opening for the red discharge cell, d _G is the second direction width of the opening for the green discharge cell, and d _B is the second direction width of the opening for the blue discharge cell. The method of claim 8, And the openings have different widths in the first direction with respect to the discharge cells of the red, green, and blue colors. The method of claim 11, And the width of the opening satisfies h _R > h _{G & gt} ; h _B. Where h _R is the first direction width of the opening for the red discharge cell, h _G is the first direction width of the opening for the green discharge cell, and h _B is the first direction width of the opening for the blue discharge cell. The method of claim 1, And the transparent electrode is formed in a continuous stripe form along the bus electrode.

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