KR20080040261A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to enhance light room contrast by forming subtractive color mixture relationship between a bus electrode and an external light reflection prevention member. A front substrate(15) is arranged in a predetermined interval from a rear substrate(10). An address electrode(11) is extended 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. A light guide(111a) includes a light receiving surface and a light transmitting surface. An area of the light receiving surface is larger 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 a first color. The display electrode includes a bus electrode which 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 partial plan view 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

111: day light 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 paired display electrodes are provided on the front substrate and the rear substrate, respectively, and discharges are formed in the direction of the rear substrate from the front substrate. On the other hand, the surface discharge type plasma display panel has a structure in which paired display electrodes are arranged on the same substrate, and discharge is formed 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 is a method of increasing contrast to increase contrast, a method of improving reflectance by reducing reflection brightness, and a method of improving panel brightness by increasing luminous efficiency. The need for technology development is emerging.

According to the present invention, the bus electrode is formed in a single layer so that undercutting and edge curling occur less, and at the same time, the color of the daylight anti-reflective member of the daylight and the color of the bus electrode are colored so that the color of the bus electrode is complementary. It is to provide a plasma display panel with improved light and dark 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 the rear substrate, and a first intersection on the front substrate; A display electrode formed in two directions, a partition wall disposed in a space between the front substrate and the rear substrate to partition a plurality of discharge cells, an incidence surface and an outgoing surface through which light generated in the discharge cells pass, and the incidence surface And a light guide having a larger area than that of the exit surface and adjacent to the light guides, wherein the light guide includes an external light reflection preventing member colored in a first color, and the display electrode is mixed with the first color. Bus electrodes colored in a second color in relationship.

In addition, in the plasma display panel according to the embodiment of the present invention, it is preferable that the first color colored on the external light reflection preventing member and the second color colored on the bus electrode are complementary to each other. In addition, the bus electrode is preferably formed of a metal material. In addition, the external light reflection preventing member is preferably colored orange.

In addition, the plasma display panel according to an embodiment of the present invention, the external light reflection prevention member preferably comprises a material selected from the group consisting of Cu, Sb and Cr. In addition, the bus electrode is preferably colored blue. In addition, the bus electrode preferably includes a material selected from the group consisting of Mn, Ni, and Co.

In addition, in the plasma display panel according to the embodiment of the present invention, it is preferable that the bus electrode is colored in an orange series. In addition, the external light reflection preventing member is preferably colored blue. In addition, the bus electrode is preferably formed of a single layer. 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.

A display electrode 16 extending in a second direction (x-axis direction in the drawing) is formed on the lower surface of the front substrate 15, and the display electrodes 16 are formed side by side with a predetermined distance from the neighboring ones. 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 includes 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 discharge gaps corresponding to the respective discharge cells 19.

Meanwhile, the sustain electrode 16a and the scan electrode 16b include transparent 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 is conductive. This is 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 radiation emitted by the discharge excites the phosphor layer 14 applied in the discharge cell 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 a 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 becomes more delicate as it passes through the exit surface 21. In addition, as the light gathers, the intensity increases, which increases the brightness of the light.

In addition, in the embodiment of the present invention, the external light reflection preventing member 111b is colored in the first color, and thus easily absorbs light emitted from the outside of the plasma display panel. Therefore, the reflected luminance of the plasma display panel is reduced and the bright room contrast is maintained.

Therefore, the plasma display panel including the day light 111 realizes a high pixel of Super High Difinition (SHD) level and maintains contrast even in a bright room.

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 external light reflection preventing member 111b according to the present embodiment is colored in the first color, and the bus electrodes 16ab and 16bb are colored in the second color. Thus, the first color and the second color are blue-mixed with each other. In a relationship. Therefore, when the first color of the external light reflection preventing member 111b and the second color of the bus electrodes 16ab and 16bb overlap, the brightness becomes low and becomes 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 bus electrodes 16ab and 16bb and their relationship will be described in detail with reference to FIG. 4.

In this embodiment, the bus electrodes 16ab and 16bb are formed in a single layer. As the bus electrodes 16ab and 16bb are formed in a single layer, the process is simplified.

In addition, since it is a single layer, the process becomes uniform when exposed to form the bus electrodes 16ab and 16bb, and is developed uniformly by a developing solution so that undercut phenomenon is less likely to occur. In addition, since the bus electrodes 16ab and 16bb are not formed of different materials, fewer edge curls occur during the drying and firing processes.

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 be formed in various structures such as 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).

3 is a partial plan view 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 cell 19 is partitioned by the partition wall 13. The sustain electrode 16a and the scan electrode 16b are paired with each other and are formed along the discharge cell 19 in the first direction (y-axis direction in the drawing), and the sustain electrode 16a and the scan electrode 16b are separated from each other. Bus electrodes 16ab and 16bb are formed on the lower surface.

The plasma display panel has an image display area. For convenience of description, the image display area is shown only a part of the entire area.

The image display area includes the area where the phosphor layer 14 is visible through the front substrate 15, the area where the partition wall 13 is visible through the front substrate 15, and the bus electrodes 16ab and 16bb through the front substrate 15. ) Is visible.

According to the exemplary embodiment of the present invention, when the external light reflection preventing member 111b described above with reference to FIGS. 1 and 2 is colored in blue, and the bus electrodes 16ab and 16bb are colored in orange, the overlapping portions are black. It is close to. Therefore, the reflection brightness of the plasma display panel is reduced, and the black ratio and the bright room contrast are improved.

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 in the figure, orange is complementary to orange, 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 blue.

As a result, when the color of the external light reflection preventing member 111b is orange, the color of the bus electrodes 16ab and 16bb is preferably blue. Alternatively, when the color of the external light reflection preventing member 111b is blue, the color of the bus electrodes 16ab and 16bb 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 edge electrode and the undercut phenomenon are less likely to occur in the bus electrode formed of a single layer.

In addition, since the bus electrode is formed of a single layer, there is an effect that the manufacturing process is simplified.

In addition, the first color of the external light reflection preventing member and the second color of the bus electrode are in a dark blue color mixing relationship, which has an effect of increasing black portion and bright room contrast.

In addition, the first color of the external light reflection preventing member and the second color of the bus electrode are complementary to each other, which has an effect of increasing black ratio and bright room contrast.

Claims (11)

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; Barrier ribs disposed in a space between the front substrate and the rear substrate to partition a plurality of discharge cells; 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 between the light guides adjacent to each other, and includes an external light reflection preventing member colored in a first color, The display electrode includes a bus electrode colored in a second color in a navy blue mixing relationship with the first color. According to claim 1, And a first color colored on the external light reflection preventing member and a second color colored on the bus electrode are complementary to each other. According to claim 1, The bus electrode is a plasma display panel formed of a metal material. According to claim 1, The external light reflection preventing member is colored in an orange series plasma display panel. The method of claim 4, 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 And the bus electrode is colored in a blue series. The method of claim 6, And the bus electrode comprises a material selected from the group consisting of Mn, Ni, and Co. According to claim 1, And the bus electrode is colored in an orange series. The method of claim 8, The external light reflection preventing member is colored in a blue series plasma display panel. According to claim 1, And the bus electrode is formed of a single layer. According to claim 1, And a light exit surface of the light guide is subjected to anti-reflective treatment.

Images