KR20080040262A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to increase a blackening rate and to enhance light room contrast by reducing reflective luminance. A front substrate(15) and a rear substrate(10) are arranged opposite to each other. An address electrode(11) is formed in a first direction on the rear substrate. A display electrode(16) is formed in a second direction crossing the first direction on the front substrate. A barrier rib(13) is disposed in a space between the front and rear substrates in order to define discharge cells. The barrier rib is colored with a first color. A light guide(111a) includes a light receiving surface and a light transmitting surface. An area of the light receiving surface is wider than an area of the light transmitting surface. An external light reflection prevention member(111b) is formed between the light guides. The external light reflection prevention member is colored with a second color. The first and second colors have subtractive color mixture relationship.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

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

3 is a plan view illustrating an image display area of a plasma display panel according to an exemplary embodiment of the present invention.

4 is a color redemption table illustrated to explain the complementary color relationship.

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

10: back substrate 11: address electrode

12: back dielectric layer 13: bulkhead

13a: horizontal partition member 13b: vertical partition member

14 phosphor layer 15 front substrate

16: display electrode 16a: sustain electrode

16b: scan electrode 16ab, 16bb: bus electrode

16aa, 16ba: transparent electrode 17: front side dielectric layer

18: protective layer 19: discharge cell

20: entrance face 21: exit face

30: image display area 30a: first area

30b: second region 111: daylight

111a: light guide 111b: external light reflection preventing member

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 in which black portion ratio and bright room contrast are improved by coloring different layers in the panel.

The plasma display panel forms a plasma through a discharge phenomenon. Ultraviolet (UV) light emitted from the plasma excites the phosphor layer, and an image is realized by using visible light of red (R), green (G), and blue (B) colors generated in the phosphor layer.

The plasma display panel can easily realize a large screen, and because it is a self-luminous display device such as a cathode ray tube (CRT), not only has good color reproducibility but also has a large field of view and excellent image display ability. In addition, the plasma display panel has a strength in terms of productivity and cost since the manufacturing method is simpler than liquid crystal display (LCD).

The plasma display panel may be classified into a direct current type (DC) and an alternating current type (AC) according to its discharge type. The DC plasma display panel has a structure in which electrodes are exposed to a discharge space, and charges are directly transferred between corresponding electrodes.

In an AC plasma display panel, an electrode is covered with a dielectric layer, and discharge is performed by wall charge. In recent years, AC plasma display panels have become mainstream.

In addition, the plasma display panel may be classified into a facing discharge type and a surface discharge type according to the arrangement of the electrodes. On the other hand, the opposite discharge type plasma display panel has a structure in which display electrodes are provided on the front substrate and the rear substrate, respectively, and discharge is formed in the direction of the rear substrate from the front substrate. On the other hand, the surface discharge plasma display panel has a structure in which display electrodes are arranged on the same substrate, and discharge occurs on one plane of the substrate.

Such a plasma display panel selects a discharge cell by using the storage characteristics of wall charges, causes a discharge in the selected discharge cell, and combines them appropriately to realize an image.

Particularly, in an external bright condition, that is, a bright room condition, external light is incident to the inside of the panel and overlaps with light generated in the discharge cell. As a result, the bright room contrast is lowered and the image display capability of the plasma display panel is lowered.

Meanwhile, various attempts have been made to improve the image display capability of the aforementioned plasma display panel. There are methods to improve contrast by increasing black ratio, methods to improve clear room contrast by reducing reflection brightness, and methods to improve panel brightness by increasing luminous efficiency, but they can improve clear room contrast while simplifying the manufacturing process. The need for technology development is emerging.

The present invention was devised to solve the above problems, and an object of the present invention is to color the color of the external light reflection preventing member of the daylight and the color of the partition wall to be complementary to each other, so that the black portion and the bright room are not added. The present invention provides a plasma display panel with increased contrast.

According to an embodiment of the present invention, a plasma display panel includes a front substrate disposed to face a rear substrate at an interval, an address electrode formed to extend in a first direction on a rear substrate, and a second direction crossing the first direction on a front substrate A display electrode formed in the space between the front substrate and the rear substrate, partitioning a plurality of discharge cells, and partitioning a plurality of discharge cells, and forming an entrance surface and an exit surface through which light formed in the discharge cells pass. A light guide having a surface area larger than that of the exit surface and the light guide, the light guide including an external light reflection preventing member colored in a second color, and the first color and the second color are dark blue. It is in a mixed relationship.

In addition, in the plasma display panel according to the embodiment of the present invention, it is preferable that the first color colored in the external light reflection preventing member and the second color colored in the partition wall have a complementary color relationship with each other. In addition, the external light reflection preventing member is preferably colored orange. In addition, the external light reflection preventing member preferably comprises a material selected from the group consisting of Cu, Sb and Cr.

In addition, in the plasma display panel according to the embodiment of the present invention, it is preferable that the barrier ribs are colored in a blue series. In addition, the barrier rib preferably includes a material selected from the group consisting of Mn, Ni, and Co. In addition, the partition wall is preferably colored orange.

In addition, in the plasma display panel according to the embodiment of the present invention, the external light reflection preventing member is preferably colored blue. Moreover, it is preferable that the light emission surface of the said light guide carries out anti-reflective processing. Moreover, it is preferable that the light emission surface of the said light guide carries out anti-reflective processing.

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.

Hereinafter, a plasma display panel according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

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

As shown in the figure, the plasma display panel includes discharge cells 19 partitioned between the rear substrate 10 and the front substrate 15 by partition walls 13 and address electrodes formed to correspond to the discharge cells 19. And the display electrode 16.

The back substrate 10 and the front substrate 15 face each other at predetermined intervals. An address electrode 11 extending in a first direction (y-axis direction in the drawing) is formed on an upper surface of the rear substrate 10, and the address electrodes 11 are formed to be parallel to each other with a predetermined distance from the neighboring ones. In addition, a back dielectric layer 12 is formed on an upper surface of the back substrate 10, and the back dielectric layer 12 covers the address electrode 11.

The display electrode 16 extends in a second direction (x-axis direction in the drawing) on the lower surface of the front substrate 15, and the display electrodes 16 are formed to be parallel to each other at a predetermined distance from the neighboring ones. In addition, the display electrode 16 includes a scan electrode 16b and a sustain electrode 16a corresponding to each discharge cell 19. Each of the scan electrode 16b and the sustain electrode 16a is a bus electrode 16ab. 16bb and transparent electrodes 16aa and 16ba. In addition, the transparent electrodes 16aa and 16ba are spaced apart from each other by a predetermined distance to form a discharge gap corresponding to each discharge cell 19, and cause a discharge therebetween.

On the other hand, the sustain electrode 16a and the scan electrode 16b include transparent electrodes 16aa and 16ba in consideration of transmittance and the like, and each of the transparent electrodes 16aa and 16ba has high electrical resistance and thus is conductive. Not good. Meanwhile, the bus electrodes 16ab and 16bb may be made of a metal material such as Ag having good conductivity, so that voltage may be easily applied to the transparent electrode.

A front dielectric layer 17 is formed on the bottom surface of the front substrate 15, and the front dielectric layer 17 covers the display electrode 16. The front dielectric layer 17 protects the display electrode 16 from discharge and accumulates wall charges.

The front dielectric layer 17 is covered with a protective layer 18. The protective layer 18 is a transparent material that not only easily transmits visible light emitted from the phosphor layer 14 but also protects the front dielectric layer 17 from discharge. In addition, the protective layer 18 increases the secondary electron emission coefficient to lower the discharge start voltage so that discharge occurs easily.

A partition 13 is formed between the protective layer 18 and the back dielectric layer 12. The partition 13 includes a horizontal partition member 13a and a vertical partition member 13b.

The horizontal partition member 13a is formed to extend in the second direction (x-axis direction in the drawing), and the vertical partition member 13b is formed to extend in the first direction (y-axis direction in the drawing). In addition, the vertical partition member 13b and the horizontal partition member 13a cross each other. In the present embodiment, the horizontal partition wall member 13a and the vertical partition wall member 13b partition the discharge cells 19 in a grid form.

Naturally, the discharge cells 19 according to the embodiment of the present invention may be formed in various shapes such as a stripe or a delta. The partition 13 of this type prevents crosstalk between the discharge cells 19 and provides a surface on which the phosphor layer 14 is applied.

The discharge cell 19 is filled with a discharge gas which is an inert gas (for example, a mixed gas of Ne and Xe). Such a discharge gas facilitates the discharge between the sustain electrode 16a and the scan electrode 16b. The vacuum ultraviolet rays emitted by the discharge excite the phosphor layer 14 applied in the discharge cell 19 to emit visible light, and the visible light is combined to realize an image.

In addition, the daylight 111 is formed on the upper surface of the front substrate. The day light 111 includes a light guide 111a and an external light reflection preventing member 111b. The light guide 111a and the external light reflection preventing member 111b are formed parallel to each other in the second direction (x-axis direction in the drawing).

In the day light 111, the light guide 111a is formed with the incident surface 20 and the exit surface 21. As shown in FIG. The incident surface 20 is a surface on which light formed in the discharge cell 19 is incident, and the emission surface 21 is a surface on which light incident through the incident surface 20 is emitted to the outside.

On the other hand, the area of the exit surface 21 is smaller than the area of the incident surface 20. Due to this structure, light entering through the entrance surface 20 passes through the exit surface 21 and becomes more delicate. In addition, as the light gathers, the intensity increases, which increases the brightness of the light.

The plasma display panel including the daylight 111 realizes a high pixel of super high definition (SHD) level, and maintains contrast even in bright room conditions.

In the day light 111, since light is not absorbed at the interface between the light guide 111a and the external light reflection preventing member 111b, the light entering through the incident surface 20 is not easily lost. In addition, the emission surface 21 of the light guide 111a is subjected to a non-glare treatment, further reducing the reflection luminance of the plasma display panel.

The partition 13 according to the present embodiment is colored in a first color, and the external light reflection preventing member 111b is colored in a second color. In addition, the first color and the second color have a relationship of navy blue mixing with each other. Therefore, when the first color and the second color overlap, the brightness becomes dark and dark. In particular, when the first color and the second color have a complementary color relationship, the overlapping color becomes black or an achromatic color close to black.

The color of the external light reflection preventing member 111b and the color of the partition wall 13 and their relationship will be described in detail with reference to FIG. 4.

In the embodiment of the present invention, the light guide 111a and the external light reflection preventing member 111b are formed in the second direction (x-axis direction in the drawing), but in another embodiment, in the first direction (y-axis direction in the drawing). Can also be formed. In addition, in the embodiment of the present invention, the external light reflection preventing member 111b has a stripe shape, but in another embodiment, the external light reflection preventing member 111b may have a lattice shape.

Further, in the embodiment of the present invention, one light guide 111a is formed to correspond to each discharge cell, but in another embodiment, two or more light guides 111a may be provided in each discharge cell. In another embodiment, one light may be provided in the plurality of discharge cells. In addition, the day light may be provided with a conductive film for shielding electromagnetic waves (EMI).

In the embodiment of the present invention, the light guide 111a and the external light reflection preventing member 111b are formed in the second direction (x-axis direction in the drawing), but in another embodiment, in the first direction (y-axis direction in the drawing). Can also be formed. In addition, in the embodiment of the present invention, the external light reflection preventing member 111b has a stripe shape, but in another embodiment, the external light reflection preventing member 111b may have a lattice shape.

Further, in the embodiment of the present invention, one light guide 111a is formed to correspond to one discharge cell line, but in another embodiment, the plurality of light guides 111a are formed to correspond to one discharge cell line. have. In another embodiment, one light guide 111a is formed to correspond to the plurality of discharge cell lines. In another embodiment, one light guide 111a may be formed to correspond to one discharge cell. In another embodiment, one light guide 111a may be formed to correspond to the plurality of discharge cells. In another embodiment, the plurality of light guides 111a may be formed to correspond to one discharge cell. In another embodiment, an electromagnetic shield (EMI) shielding film is formed on the day light 111 to reduce electromagnetic waves emitted from the plasma display panel.

3 is a plan view illustrating an image display area of a plasma display panel according to an exemplary embodiment of the present invention.

Referring to FIG. 3 according to an embodiment of the present invention, the same reference numerals are used for the same or similar parts as those of FIGS. 1 and 2, and repeated descriptions thereof will be omitted.

As shown in FIG. 3, the discharge cells are partitioned by the partition wall 13. The sustain electrode 16a and the scan electrode 16b are paired with each other to be formed along the discharge cell in the first direction (y-axis direction in the drawing), and the bus electrodes 16ab on the lower surfaces of the transparent electrodes 16aa and 16ba. 16bb) is formed.

The plasma display panel has an image display region 30 in which an image is displayed. The image display region 30 includes a first region 30a through which the phosphor layer 14 is visible through the front substrate 15, and a front substrate ( And a second region 30b through which the partition wall 13 is visible.

According to the exemplary embodiment of the present invention, when the external light reflection preventing member 111b is colored in blue and the partition 13 is colored in orange, the overlapping portions have a color close to black. Therefore, the reflection brightness of the plasma display panel is reduced, and the black ratio and the bright room contrast are improved.

In addition, when the external light reflection preventing member 111b is colored in orange, and the partition wall 13 is colored in blue, the overlapping portions have a color close to black. Therefore, the reflection brightness of the plasma display panel is reduced, and the black ratio and the bright room contrast are improved.

On the other hand, conventionally, in order to reduce the reflection brightness, the external light reflection preventing member 111b is colored with a color close to black that easily absorbs light, and thus has a disadvantage of absorbing visible light formed in the discharge cell. The embodiment of the present invention solves this problem.

4 is a color redemption table illustrated to explain the complementary color relationship.

The relationship that overlaps or becomes colored (black, white, gray) is said to be complementary. As shown, orange is complementary to blue, red to cyan is complementary, and violet is complementary to light green.

Although not shown in the color redemption table, black and white are complementary to each other, and there are countless colors in the complementary relationship.

On the other hand, even if the color is not complementary, the color of the complementary color is mixed with dark blue to have a dark color close to black. These colors easily absorb light. For example, in FIG. 4, the red color is not related to the blue color but is adjacent to the orange color, which is a blue complementary color. In this case, when the blue color is mixed with the deep red color, the color becomes close to black.

As a result, when the color of the partition 13 is orange, the color of the external light reflection preventing member 111b is preferably blue. Alternatively, when the color of the partition 13 is blue, the color of the external light reflection preventing member 111b is preferably orange. At this time, the orange series may include brown, which has a color similar to orange.

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, according to the plasma display panel according to the present invention, the external light reflection preventing member and the partition wall are colored, and the color of the external light reflection preventing member and the color of the partition wall are complementary to each other, which reduces the luminance of the reflection to reduce the black fraction and It has the effect of increasing the clear room contrast.

Claims (10)

A front substrate disposed to face the rear substrate at intervals; An address electrode formed to extend in a first direction on the rear substrate; A display electrode formed on the front substrate in a second direction crossing the first direction; A partition wall disposed in a space between the front substrate and the rear substrate to partition a plurality of discharge cells and colored in a first color; Light guides having an entrance surface and an emission surface through which light generated in the discharge cell passes, and an area of the entrance surface larger than an area of the emission surface; And It is formed adjacent to the light guides, and includes an external light reflection preventing member colored in a second color, And the first color of the barrier rib and the second color of the external light reflection preventing member are in a dark blue mixing relationship. According to claim 1, And a first color tinted on the external light reflection preventing member and a second color tinted on the partition wall in a complementary color relationship with each other. According to claim 1, The external light reflection preventing member is colored in an orange series plasma display panel. The method of claim 3, wherein The external light reflection preventing member includes a material selected from the group consisting of Cu, Sb, and Cr. The method of claim 4, wherein The partition wall is a plasma display panel colored in a blue series. The method of claim 5, And the partition wall includes a material selected from the group consisting of Mn, Ni, and Co. According to claim 1, The partition wall is a plasma display panel colored in orange. The method of claim 7, wherein The external light reflection preventing member is colored in a blue series plasma display panel. According to claim 1, And a light exit surface of the light guide is subjected to anti-reflective treatment. According to claim 1, And a light exit surface of the light guide is subjected to anti-reflective treatment.

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