KR20080040981A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to prevent the reduction of luminance and the deterioration of display quality by absorbing external light transmitted through a front substrate. A rear substrate(10) is arranged opposite to a front substrate(20) for forming an image. A barrier rib is arranged between the first and second substrates in order to define discharge cells. The barrier rib is colored with a first color. A phosphor layer(19) is formed within each of the discharge cells. A display electrode(27) is formed in a first direction on the front substrate corresponding to each of the discharge cells. An upper dielectric layer(28) is formed on the front substrate to cover the display electrode. The upper dielectric layer is colored with a second color. An address electrode(12) is formed in a second direction crossing the first direction on the rear substrate corresponding to each of the discharge cells. A lower dielectric layer(14) is formed on the rear substrate to cover the address electrode. The lower dielectric layer is colored with a third color. The third color is made by a subtractive color mixture of the first and second colors.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

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

FIG. 3 is a plan view illustrating a state in which the upper dielectric layer, the partition wall, and the lower dielectric layer of the plasma display panel according to the first embodiment are superimposed and mixed blue.

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 preventing degradation of display quality due to reflection of external light while minimizing a decrease in luminance.

As is well known, a plasma display panel (hereinafter referred to as a "PDP") is a product generated by excitation of phosphors by vacuum ultraviolet (VUV) radiation emitted from plasma obtained through gas discharge. A display device for realizing an image using visible light of (R), green (G), and blue (B).

The PDP can realize a 60-inch or larger screen with a thickness of only 10 cm or less, and since it is a self-luminous display device such as a CRT, it has no characteristic of distortion due to color reproduction and viewing angle, and also has a simple manufacturing method compared to LCD. As a result, it is gaining popularity as a TV and an industrial flat panel display having strength in terms of productivity and cost.

In a PDP having a general AC three-electrode surface discharge structure, a pair of electrodes are formed on a front substrate to face each other, and a rear substrate spaced from the front substrate has an address electrode. Between the front substrate and the back substrate, a plurality of discharge cells partitioned by the partition wall are formed along the intersection of these electrodes and the address electrode. A phosphor layer is formed inside this discharge cell, and discharge gas is inject | poured.

In the PDP configured as described above, millions of unit discharge cells are arranged in a matrix form. These discharge cells select discharge cells that are turned on and discharge cells that are not turned on by using the memory characteristics of wall charges, and display images by discharging the selected discharge cells.

However, while an image is displayed on the front surface of the PDP, outside light is incident from the various light sources outside the PDP to the front surface of the PDP. As the external light incident on the front surface of the PDP is reflected, the external light reflection is generated, which is mixed with the visible light displayed by the PDP, thereby reducing the display performance of the image actually expressed by the PDP.

In order to reduce such external light reflection, the display quality of the conventional PDP is reduced by applying a colored bus electrode or a black stripe to the front substrate or by applying a colored partition to absorb external light incident from the outside. To prevent them.

However, in the case of the colored bus electrode or the black stripe, the problem is limited to the non-discharge region, and in particular, the position change is limited in the case of the bus electrode. In addition, in the case of the colored partition wall, as a part of the visible light generated in the discharge cell is absorbed, the front transmittance of the visible light is lowered, thereby lowering the brightness, and thus, the display quality is deteriorated.

The present invention has been devised to solve the above problems, and more particularly, the present invention relates to a plasma display panel which can prevent display quality from deteriorating due to reflection of external light while minimizing luminance deterioration.

In order to achieve the above object, the plasma display panel of the present invention includes a front substrate on which an image is implemented, a rear substrate facing and facing the front substrate, and disposed between the front substrate and the rear substrate to partition a plurality of discharge cells. A barrier layer which is transparent and colored in a first color, a phosphor layer applied in each of the discharge cells, a display electrode corresponding to each of the discharge cells on the front substrate and formed along the first direction, and a display An upper dielectric layer formed on the front substrate to cover the electrode and colored in a second color, and an address electrode and an address formed on the rear substrate corresponding to each discharge cell and formed along a second direction crossing the first direction; A lower dielectric formed on the back substrate so as to cover the electrode and colored in a third color that is navy-mixed with the first and second colors It includes.

The first color may be a color having a lower absorbance of visible light than the second color and the third color.

The third color may be a color having a lower absorbance of visible light than the second color. The first color, the second color, and the third color may be any one of cyan, purple, and yellow, respectively.

The first color is yellow, the second color is bluish green, and the third color is purple.

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 partial cutaway perspective view of a plasma display panel according to a first embodiment of the present invention, Figure 2 is a side cross-sectional view taken along the line II-II of FIG.

Referring to FIG. 1, in the plasma display panel of this embodiment, the front substrate 20 and the rear substrate 10 are disposed to face each other. The spaces between the front substrate 20 and the rear substrate 10 are partitioned by partition walls 16 to form respective discharge cells 18.

The partition 16 has a horizontal partition 16a formed long in a first direction (x direction in the drawing), and a vertical partition formed long in a second direction (y direction in the drawing) orthogonal to the horizontal partition 16a ( 16b). Therefore, in the present embodiment, the discharge cells 18 partitioned by the horizontal partition 16a and the vertical partition 16b are partitioned in the form of a "metrics" pattern.

However, in the present invention, the partition wall 16 is not necessarily limited thereto, and the discharge cells 18 partitioned by the partition wall 16 may have various shapes, such as a “stripe” pattern or a “delta” pattern, in addition to the “metrics” pattern described above. Of course, it can be divided into.

The partition 16 is transparent and is colored in a first color so as to absorb external light incident through the front substrate 20 from the outside to prevent external light from being reflected while lowering bright room contrast.

In one example, the partition wall may be colored in a first color by mixing a colored pigment into the transparent dielectric constituting it.

The first color to be colored on the partition 16 may be any one of purple (M), blue green (C), and yellow (Y), which are the primary colors of the navy blue mixture. In this embodiment, the first color to be colored on the partition 16 is yellow (C).

Here, the navy blue mixed primary colors are purple (M), blue green (C), and yellow (Y) as the three primary colors of the color, and the navy blue mixed secondary colors obtained by mixing them with each other are red (R), green (G), and Navy blue (BP).

Red (R) is a secondary color obtained by dark blue mixing of primary colors purple (M) and yellow (Y), and green (G) is dark blue by mixing primary colors blue green (C) and yellow (Y) The secondary color obtained is indigo blue (BP) is the secondary color obtained by mixing the primary index purple (M) and blue green (C).

Here, red has a complementary color relationship with blue green (C) and dark blue mixed, green has a complementary color relationship with purple (M) and dark blue mixed, and indigo blue has a complementary color relationship with yellow (Y) and dark blue mixed. Thus, black (BL) can be obtained by the tricolor mixing of these dark blue mixed primary colors.

The discharge cells 18 partitioned by the partition walls 16 form a sub pixel, which is a minimum unit for displaying an image, and a plurality of sub pixels form one pixel. As described above, a phosphor layer 19 is formed in the discharge cells 18 to absorb the vacuum ultraviolet rays obtained through the plasma gas discharge to emit visible light for each color.

The phosphor layer 19 is formed repeatedly by phosphors of red (R), green (G), and blue (B) in the discharge cells 18 arranged along the first direction, and disposed along the second direction. Each discharge cell is formed of a phosphor of the same color.

Therefore, in the phosphor layer 19, the red discharge cells 18R, the green discharge cells 18G, and the blue discharge cells B constitute one set in the first direction and form one unit pixel.

Each discharge cell 18 in which the phosphor layer 19 is formed is filled with a discharge gas (eg, a mixed gas including xenon (Xe), neon (Ne), etc.) to cause plasma discharge.

The display electrode 27 and the address electrode 12 are provided on the front substrate 20 and the rear substrate 10 to correspond to the discharge cells 18, respectively.

The display electrode 27 and the address electrode 12 are arranged to intersect with each other in each of the discharge cells 18, so that the selected discharge cells 18 are selected after the address discharge and the address discharge for selecting the discharge cells 18 to be turned on. Sustained discharge is caused to implement the image through.

First, the display electrode 27 corresponds to each discharge cell 18 on the front substrate 20 and extends in parallel to each other along a second direction crossing the address electrode 12. And sustain electrode 26.

The scan electrode 23 and the sustain electrode 26 are respectively set toward the center of the discharge cell 18 from the bus electrodes 21 and 24 extending along the horizontal partition wall 16a and from the bus electrodes 21 and 24. It includes a transparent electrode 22, 25 having a width and protruding.

The bus electrodes 21 and 24 are made of an opaque metal material having good electrical conductivity to smoothly supply the discharge voltage required for plasma discharge through the transparent electrodes 22 and 25 having high electrical resistance.

In this case, the opaque metal bus electrodes 21 and 24 may be formed on the horizontal partition walls 16b partitioning the discharge cells 18 so as to increase the transmittance of visible light generated in the discharge cells 18 by plasma discharge. It is provided adjacent to, and more preferably is installed along the horizontal partition wall (16a).

The transparent electrodes 22 and 25 are made of a transparent indium tin oxide (ITO) material so as to increase the transmittance of visible light.

In the present embodiment, the transparent electrodes 22 and 25 are all disposed in the red, green, and blue discharge cells 18R, 18G, and 18B in the first direction along the bus electrodes 21 and 24 on the front substrate 20. Correspondingly extending in the form of a "stripe" pattern.

However, the present invention is not necessarily limited thereto, and the transparent electrodes 22 and 25 correspond to the red, green, and blue discharge cells 18R, 18G, and 18B, respectively, and protrude from the bus electrodes 21 and 24 individually. It can be natural.

An upper dielectric layer 28 is formed on the front substrate 20 to cover the scan electrodes 23 and the sustain electrodes 26 and to facilitate charge accumulation during plasma discharge.

The upper dielectric layer 28 is colored with a first color of the partition wall 16 and a second color that is navy-mixed with each other. In one example, the upper dielectric layer 28 may be colored in a second color by mixing colored pigments into the transparent dielectric constituting it.

The second color may be different from the first color, and may be any one of the navy blue mixed primary index blue green (C), yellow (Y), and purple (M).

In the present exemplary embodiment, the second color to be colored in the upper dielectric layer 28 is bluish green (C). Accordingly, the blue green color C colored on the upper dielectric layer 28 is dark blue mixed with the yellow color Y colored on the partition wall 18 and exhibits green color G, which is a dark blue mixed secondary color.

A passivation layer 29 is formed on the upper dielectric layer 28 to prevent damage due to exposure to plasma discharge occurring in the discharge cell 18.

The protective film 29 may be formed of a visible light transmissive MgO film that protects the upper dielectric layer 28 and has a high secondary electron emission coefficient, thereby further lowering the discharge start voltage.

The passivation layer 29 is colored with the first color that is colored in the upper dielectric layer 28 and the second color that is navy blue mixed with each other. In one example, the protective film can be colored by depositing a colored pigment on the MgO film.

In addition, an address electrode 12 is formed on the rear substrate 10 in a second direction corresponding to each of the discharge cells 18 and intersecting the display electrode 27. The address electrodes 12 are arranged side by side in a stripe shape between the vertical partition walls 16b.

The lower dielectric layer 14 is formed on the rear substrate to cover the address electrode 12. The lower dielectric layer 14 prevents breakage of the address electrode 12 during plasma discharge and facilitates charge accumulation.

Further, the lower dielectric layer 14 is made of an opaque dielectric having a high reflectance to reflect visible light generated in the discharge cells 18 toward the front substrate 20.

The lower dielectric layer 14 is colored with a first color that is colored in the upper dielectric layer 28 and a third color that is dark-mixed with the second color that is colored in the passivation layer 29.

This lower dielectric layer 14, like the upper dielectric layer 28, can be colored by mixing colored pigments into the opaque dielectric that forms it.

The third color to be colored on the lower dielectric layer 14 is made of a color different from the first and second colors, and any one of the dark blue mixed primary colors blue green (C), purple (M), and yellow (Y) It can be made in color.

In the present embodiment, the third color is purple (M). Thus, the first color is yellow (Y), the second color is bluish green (C), and the third color is purple (M).

As such, purple (M) of the lower dielectric layer 14 is complementary to green (G) in which blue-green (C) of the upper dielectric layer 28 and yellow (Y) of the passivation layer 29 are dark blue mixed with each other and black (BL). Navy blue is mixed to stand out.

In addition, the aforementioned partition wall 16 is formed on the lower dielectric layer 14 to partition each of the discharge cells 16.

3 is a plan view illustrating a state in which the upper dielectric layer, the partition wall, and the lower dielectric layer of the plasma display panel according to the first embodiment are superimposed and mixed in blue.

Referring to FIG. 3, the blue electrodes C and C, which are colored in the upper dielectric layer 28, and yellow color M, which is colored in the partition 16, are bus electrodes 21 and 24 that are opaque layers. Except) part, it is mixed with navy blue color and becomes green (G).

In addition, green (G) in which blue-green (C) of the upper dielectric layer 28 and yellow (Y) of the partition wall 16 are dark blue mixed with each other is again purple (M) of the lower dielectric layer 14 through the transparent partition wall 16. It is mixed with dark blue and becomes black (BL).

As such, the three colors of bluish green color (C) of the upper dielectric layer 28, yellow color (Y) of the partition wall 18, and purple color (M) of the lower dielectric layer 14 are dark blue mixed, and external light is emitted at a portion showing black (BL). By preventing absorption of external light by reflection, the bright room contrast ratio is prevented from being lowered.

In addition, the upper dielectric layer 28, the partition 16, and the lower dielectric layer 14 are divided into blue green (C), yellow (Y), and purple (M), which are the dark blue mixed primary colors, respectively. By absorbing the external light to prevent the visible light is absorbed by the specific colored portion colored with a high light absorption rate and the luminance is prevented

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications or changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. In addition, it is natural that it belongs to the scope of the present invention.

As described above, the plasma display panel according to the present invention is colored with any one of the navy blue mixed primary colors blue green, purple, and yellow to the upper dielectric layer, the partition wall, and the dielectric layer, respectively, and is incident through the front substrate by the navy blue mixture thereof. By absorbing the external light, it is possible to prevent the degradation of the display quality due to the decrease in brightness and reflection of the external light.

Claims (7)

A front substrate on which an image is implemented; A rear substrate facing and facing the front substrate; A partition wall disposed between the front substrate and the rear substrate to partition the plurality of discharge cells, the partition wall being transparent and colored in a first color; A phosphor layer coated in each of the discharge cells; A display electrode corresponding to each of the discharge cells on the front substrate and formed along the first direction; An upper dielectric layer formed on the front substrate to cover the display electrode and colored in a second color; An address electrode corresponding to each of the discharge cells on the rear substrate and formed in a second direction crossing the first direction; And And a lower dielectric layer formed on the rear substrate so as to cover the address electrode, and colored in a third color that is dark-mixed with the first color and the second color. In claim 1, The first color is, And a color having a lower absorption rate of visible light than the second color and the third color. In claim 1, And the third color is a color having a lower absorbance of visible light than the second color. In claim 1, The first color, the second color and the third color, Each plasma display panel is formed of any one of cyan, purple and yellow. In claim 4, And the first color is yellow. In claim 5, And the second color is bluish green. In claim 6, And the third color is purple.

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