KR20040020094A - Plasma display panel having reduced light reflection by external light and methode thereof - Google Patents

Abstract

PURPOSE: A PDP and a method of manufacturing the same are provided to improve contrast ratio by absorbing nearly external light at a black stripe. CONSTITUTION: A PDP comprises a rear substrate(10), an address electrode(12) provided on the rear substrate, a dielectric layer(14) deposited on the address electrode, a barrier rib(16) formed on the dielectric, a phosphor(18) deposited on the barrier rib and the dielectric, a front substrate(24) spaced apart from the rear substrate, grooves formed on an outer surface of the front substrate in a predetermined depth, a black stripe(28) buried into the grooves, display electrodes formed on an inner surface of the front substrate in such a manner that the display electrodes are arranged each between the black stripes, a dielectric formed on the display electrodes, and a discharge gas layer disposed between the front substrate and the rear substrate.

Description

Plasma display with reduced external light reflection and manufacturing method thereof {PLASMA DISPLAY PANEL HAVING REDUCED LIGHT REFLECTION BY EXTERNAL LIGHT AND METHODE THEREOF}

The present invention relates to a plasma display with reduced external light reflection, and more particularly, to a plasma display with reduced external light reflection by providing a black stripe having a predetermined depth on the outer surface of the front substrate.

A typical plasma display is an apparatus for forming an image by a light emitting by plasma discharge or a phosphor excited by plasma discharge, and applying a predetermined voltage to two electrodes installed in the discharge space of the plasma display panel so that plasma discharge occurs between them. Then, the phosphor layer formed in a predetermined pattern is excited by ultraviolet rays generated at the time of discharge so that an image is formed. Such plasma displays are roughly classified into an AC type, a DC type, and a hybrid type.

1 shows a conventional alternating current plasma display in an exploded perspective view.

Referring to the drawings, a typical plasma display includes a back substrate 102, an address electrode 104 formed on the back substrate 102, a dielectric layer 106 formed on the back substrate 102 on which the address electrodes 104 are formed, And a plurality of partitions 108 formed on the dielectric layer 106 to maintain the discharge distance and to prevent electro-optical crosstalk between cells.

In addition, the front substrate 114 having the common electrode 110 and the scan electrodes 112 orthogonal to the address electrode 104 formed at the rear substrate 102 at a predetermined interval orthogonal to the rear substrate 102 are formed. The rear substrate 102 is sealed.

The common and scan electrodes 110 and 112 constituting the display electrode are formed of transparent indium tin oxide (ITO), and bus electrodes 110a and 112a for reducing line resistance are formed on the upper surface thereof. It is formed in a narrower width. In addition, a phosphor layer 116 is formed on a side surface of the partition 108 and an upper surface of the dielectric layer 106 exposed therebetween, and a dielectric layer in which the electrodes 110, 112, 110a and 112a are immersed on the lower surface of the front substrate 114. 118 is formed.

In the plasma display as described above, since the bus electrodes 110a and 112a formed on the transparent common and scan electrodes 110 and 112 formed on the front substrate 114 are made of metal, light emitted by the phosphor layer 116 is emitted. To minimize the blocking of the common and scan electrodes 110 and 112 are formed on the edge of the as thin as possible. The bus electrodes 110a and 112a are formed on the upper surfaces of the common and scan electrodes 110 and 112, respectively, by using a metal material such as a printing method using silver (Ag) paste and a photolithography method using a photosensitive film.

Although only a portion thereof is illustrated in the figure, a black stripe 120 is formed around the common and scan electrodes 110 and 112 of the front substrate 114.

FIG. 2 shows a part of the cross-sectional view of FIG. 1, in which the trajectory where external light is incident and reflected is shown by a solid arrow, and the external light absorbed by the black stripe is shown by a dashed arrow. Here, the same reference numerals as in the above-described drawings indicate the same components.

Referring to the drawings, the black stripe 120 of a typical plasma display blocks only a portion of the external light incident to the front substrate 114, that is, the external light incident to the black stripe 120. It is like an arrow marked with a dotted line. The rest of the external light (shown by solid arrows) is reflected to reduce the contrast ratio.

Therefore, as the width of the black stripe 120 increases, the effect of blocking external light increases, but if the width is too large, the transmission area of the display light decreases, thereby decreasing luminance.

In addition, in the conventional plasma display, since the black stripe 120 is provided on the inner surface of the front substrate 114, external light reflected from the outer surface of the front substrate is reflected as it is.

The present invention has been made to solve the above problems, and an object thereof is to provide a plasma display having an improved contrast ratio in a state of minimizing luminance degradation.

In order to achieve the above object, the plasma display of the external light reflection of the present invention is reduced,

A back substrate;

Address electrodes provided on the rear substrate;

A dielectric applied over said address electrode;

Barrier ribs formed on the dielectric;

A phosphor applied between the partition walls;

A front substrate maintaining a predetermined distance from the rear substrate;

Grooves formed at a predetermined depth on an outer surface of the front substrate in a direction orthogonal to the address electrode;

A black stripe filled in the grooves;

Display electrodes formed on an inner surface of the front substrate so as to be positioned between the black stripes;

A dielectric formed on the display electrode;

A discharge gas layer positioned between the front substrate and the rear substrate;

It includes.

In an exemplary embodiment of the present invention, the black stripe groove may be formed as a V-shaped groove or a dam-shaped groove having a narrow width from the semicircle, semi-ellipse, or the substrate surface portion toward the substrate.

1 is an exploded perspective view of a conventional plasma display;

2 is a cross-sectional view of FIG.

3 is a schematic exploded perspective view of a plasma display with reduced external light reflection according to an embodiment of the present invention.

4 is a cross-sectional view of an essential part of FIG. 3.

FIG. 5 is a sectional view of principal parts showing a modified embodiment of FIG. 3; FIG.

6 is an essential part cross-sectional view showing another modified embodiment of FIG. 3;

FIG. 7 is an essential part cross sectional view showing another modified embodiment of FIG. 3; FIG.

8A through 8C illustrate a process of forming a black stripe on the front substrate of FIG. 3.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 illustrates an embodiment of a plasma display with reduced external light reflection according to an embodiment of the present invention.

As illustrated, the address electrode 12 is formed on the top surface of the back substrate 10 in a stripe shape, and the dielectric layer 14 is provided on the top surface of the back substrate 10 on which the address electrode 12 is formed. On the upper surface of the dielectric layer 14, a partition wall 16 formed by processing the partition layer into a predetermined pattern is formed, and the partition wall 16 and the dielectric layer 14 are provided with phosphors 18. The back substrate 10 is coupled to the transparent front substrate 24 on which the common and scan electrodes 20 and 22 provided in a state perpendicular to the address electrode 12 are formed.

Bus electrodes 20a and 22a are formed on the common and scan electrodes 20 and 22 to be narrower than the widths of the common and scan electrodes 20 and 22. In addition, a dielectric layer 26 is provided on an inner surface of the front substrate 24 to fill the bus electrodes 20a and 22a and the common and scan electrodes 20 and 22, and in the discharge space partitioned by the partition wall 16. The discharge gas layer for plasma formation is formed.

In the plasma display having such a configuration, the present invention is characterized in that a black stripe 28 is provided on the outer surface of the front substrate 24. The black stripe 28 having such a configuration may maximize the external light reflection blocking effect by absorbing a part of the external light even from the outer surface of the front substrate 24.

In detail, a plurality of grooves 30 are formed on the outer surface of the front substrate 24 in a direction parallel to the common and scan electrodes 20 and 22, and the grooves 30 are filled with a light blocking material to form a black stripe 28. Is formed. The groove 30 for accommodating the black stripe 28 has a cross section of a semi-circle, semi-ellipse, V-shape, dam-shape (shown as a V-shaped inner surface curved) as shown in FIGS. Can be formed.

4 to 7 illustrate various embodiments of FIG. 3, in which black stripes 28 are formed on an outer surface of a front substrate to minimize reflection of external light without obscuring display light.

At this time, the groove 30 and the black stripe 28 are formed in an appropriate range that does not block the display light, that is, a width W of 200 to 300 μm, and a depth of 100 to 300 μm in which no crack occurs on the front substrate. It is preferable to form in (D), and the depth D of the groove 30 and the black stripe 28 can be set variously within the said range according to external light incident angle.

According to the plasma display having such a configuration, as indicated by the dotted arrow, most of the external light is absorbed by the black stripe 28 except for some external light reflected from the outer surface of the front substrate, so that the external light reflection is significantly reduced. Can be.

8A to 8C illustrate a process of providing a black stripe on the front substrate.

Referring to the drawings, first, a plurality of grooves 30 having a predetermined depth D are formed on the outer surface of the cleaned front substrate 24 by a physical or chemical method. Here, as the physical method, a known sand blasting process 32 shown in the drawings may be used, and a known etching process may be used as the chemical method. In this case, the groove 30 may be formed in any one of a semicircle, semi-ellipse, V-shape, or dam shape as shown in FIGS. 4 to 7.

Next, the groove 30 is filled with a black pigment or a black stripe material having almost no light reflectance. In this case, the black stripe material may be applied by a coater or a sprayer, and the groove 30 may be filled with a material having almost no light reflectance, for example, a material for a neutral density filter (ND).

At this time, the width W of the black stripe 28 and the groove 30 is the same as the black stripe provided on the existing front substrate, but the height to block the reflection of all external light incident in the unit cell. Adjust After that, the remaining processes are the same as the process of forming a pattern layer on a conventional plasma display front substrate. Of course, it is also possible to provide the black stripe 28 after forming a pattern on the inner surface of the front substrate.

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 range of.

As described above, since the plasma display of the present invention absorbs most of the external light in the black stripe, the external light reflection blocking effect is maximized, the contrast is improved, and the brightness is reduced by bringing the width of the black stripe to the same as before. Can be prevented.

Claims (10)

A back substrate; Address electrodes provided on the rear substrate; A dielectric applied over said address electrode; Barrier ribs formed on the dielectric; Phosphors applied to the partitions and dielectrics: A front substrate maintaining a predetermined distance from the rear substrate; Grooves formed at a predetermined depth on an outer surface of the front substrate in a direction orthogonal to the address electrode; A black stripe filled in the grooves; Display electrodes formed on an inner surface of the front substrate so as to be positioned between the black stripes; A dielectric formed on the display electrode; A discharge gas layer positioned between the front substrate and the rear substrate; Plasma display with reduced external light reflection comprising a. The plasma display of claim 1, wherein the groove is formed to a width of 200 to 300 µm and a depth of 100 to 300 µm. The plasma display of claim 2, wherein the groove and the black stripe filled in the groove are formed in a semicircular cross section. The plasma display of claim 2, wherein the groove and the black stripe filled in the groove are formed in a semi-elliptical cross section. The plasma display of claim 2, wherein the groove and the black stripe filled in the groove are formed to have a narrower width from the outer surface of the front substrate to the inside of the substrate. 6. The plasma display according to claim 5, wherein the groove and the black stripe filled in the groove are formed in a V-shaped cross section. 7. The plasma display according to claim 6, wherein the groove and the black stripe filled in the groove are formed in a dam-shaped cross section. Forming grooves in a stripe shape on the outer surface of the cleaned front substrate; Filling a black stripe material into the groove of the front substrate; Method of manufacturing a plasma display with reduced external light reflection comprising a. The method of claim 8, wherein the forming of the grooves is performed by an etching process. The method of claim 8, wherein the forming of the grooves is performed by a sand blasting process.