KR100760096B1 - Contrast-enhancing optical sheet for plasma display panel and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a contrast-enhancing optical sheet of a plasma display panel and a method of manufacturing the same; A plurality of transparent structures formed on the transparent substrate, the width of the upper portion of which is smaller than the width of the lower portion of the transparent substrate; A reflection film formed on sidewalls of the plurality of transparent structures; And a black matrix in contact with the reflective layer, filled between the plurality of transparent structures, and formed on the transparent substrate.

Accordingly, the present invention improves the absorption of external light by increasing the Black Matrix Ratio, which is a ratio of the area occupied by the black matrix (BM) on the screen, and the loss of the image light output from the plasma display due to the reflection of the reflective film. Since it is possible to reduce the amount of light and increase the amount of light, the effect of improving the contrast occurs.

Plasma, Contrast, Optics, Reflective Film, Black Matrix, Width

Description

Contrast-enhancing optical sheet for plasma display panel and manufacturing method

1 is a schematic perspective view of an optical film for improving contrast ratio of a plasma display panel according to the related art

2 is a schematic cross-sectional view of an optical film for improving contrast ratio of a plasma display panel according to the related art.

3 is a perspective view for explaining a schematic configuration of an optical sheet for improving contrast of a plasma display panel according to the present invention;

4A and 4B are schematic cross-sectional views of an optical sheet for enhancing the contrast of a plasma display panel according to the present invention.

5 is a perspective view of a state in which an optical sheet for improving contrast of the plasma display panel is mounted on the plasma display panel according to the present invention;

6 is a schematic perspective view of a unit cell of an optical sheet for improving contrast of a plasma display panel according to the present invention;

7 is an exploded perspective view of an optical sheet unit cell for improving contrast of a plasma display panel according to the present invention;

8A and 8B are schematic cross-sectional views of unit cells of an optical sheet for improving contrast of a plasma display panel according to the present invention;

9A to 9C are cross-sectional views of a manufacturing process of the optical sheet according to the first embodiment of the present invention.

10 is a conceptual diagram illustrating a principle of improving the contrast ratio of a bright room by an optical sheet for improving contrast of a plasma display panel according to the present invention.

11A to 11C are cross-sectional views of a manufacturing process of the optical sheet according to the second embodiment of the present invention.

12 is a perspective view illustrating a state in which a stripe-shaped transparent structure is formed on a transparent substrate according to a second embodiment of the present invention.

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

100,430: Black Matrix 101: Through Hole

110,420: reflective film 150: optical sheet

200: plasma display panel 210: upper substrate

220: pixel 231,232: partition wall

300: filter 400: transparent substrate

410: transparent structure

The present invention relates to a contrast-enhancing optical sheet of a plasma display panel and a method of manufacturing the same, and more particularly to increasing the black matrix ratio, which is a ratio of an area occupied by a black matrix (BM) on a screen, to increase external light. The present invention relates to a contrast-enhancing optical sheet of a plasma display panel and a method of manufacturing the same, which have improved absorption, and can reduce the loss of image light output from the plasma display and increase the amount of light due to the reflective action of the reflective film.

Recently, a variety of displays having a high quality and a large area have been provided in response to the demand for a large screen and a high quality flat panel display. Among them, a plasma display panel (PDP) using plasma technology has been continuously developed greatly.

Currently, in the case of a plasma display panel, when the structure is divided into a panel part and a front filter formed of glass or plastic material, optical filters and electromagnetic shielding are applied to the light emitted from pixels, which are image display units of the panel. This is what the viewer sees.

Due to the characteristics of the plasma display panel, random contrast is determined by a black matrix and a filter positioned between pixels in the panel due to randomly scattered light, which is directly viewed by the limitation of the black matrix (BM) rate. Compared with other large-area flat panel displays such as a type LCD and a rear projection method, a clear room contrast improvement is needed.

1 is a schematic perspective view of an optical film for improving contrast ratio of a plasma display panel according to the prior art, comprising: a black stripe-shaped bar 11 repeatedly arranged in a horizontal direction; Except for the bottom surface of the black stripe-shaped bar 11, the optical film for improving contrast ratio of the plasma display panel according to the related art is made of a transparent material 12 surrounding the remaining area.

In the optical film for improving the contrast ratio of the plasma display panel 20 according to the related art, since the bars 11 having a black stripe shape are formed in the horizontal direction, the screens of the plasma display panel 20 are vertical. Only anti-reflection performance against external light radiated in the direction is performed.

That is, the contrast ratio improvement effect cannot be expected for the external incident light incident from the left or right side of the screen.

2 is a schematic cross-sectional view of an optical film for improving contrast ratio of a plasma display panel according to the related art, and the optical film 10 for improving contrast ratio is mounted on a screen of the plasma display panel 20.

The black stripe-shaped bar 11 of the contrast ratio improving optical film 10 is a light blocking portion, and the transparent material 12 is a light transmitting portion.

Therefore, the interface between the light transmitting portion and the light blocking portion of the optical film for improving contrast ratio according to the prior art does not have a reflective surface, so that light emitted from the panel is incident within a critical angle that causes total reflection to the interface. In this case, it is absorbed by the light blocking unit to lower the transmission efficiency.

In addition, the light emitted from the plasma display panel is absorbed by the bottom and side surfaces of the black stripe-shaped bar 11, which causes a decrease in luminance.

Therefore, the luminance of the plasma display panel is reduced.

Accordingly, the present invention has been made to solve the above problems, the present invention is to form a plurality of through holes in the black matrix, a reflective film formed on the inner surface of the through hole, and filled with a transparent material film on the inner surface of the through hole By forming an optical sheet, a contrast-enhancing optical sheet of a plasma display panel capable of improving external light absorption by increasing a black matrix ratio, which is a ratio of an area occupied by a black matrix (BM) on a screen, and its manufacture It is a first object to provide a method.

The second object of the present invention is to form a plurality of transparent structures, the width of the upper portion is smaller than the width of the lower portion, the lower portion is attached to each other, to form a reflective film on the side walls of the transparent structures, and to fill the black matrix between the transparent structures By forming an optical sheet, there is provided a contrast-enhancing optical sheet of a plasma display panel and a method of manufacturing the same, which can reduce the loss of image light output from a plasma display and increase the amount of light.

A third object of the present invention is to provide a contrast improving optical sheet of a plasma display panel and a method of manufacturing the same, which can shield electromagnetic waves emitted from a plasma display panel by using a black matrix as a conductive material or using a reflective film as a metal. There is.

A fourth object of the present invention is to form a passage for outputting image light of a plasma display panel in a rectangular shape in a horizontal direction, thereby increasing the viewing angle of a user in a large-area panel, and to improve the optical sheet of the plasma display panel and its manufacture. To provide a way.

The first preferred aspect for achieving the above object of the present invention is

A black matrix spaced apart from each other in one axial direction and having a plurality of through holes formed in a stripe shape;

A reflective film formed on inner surfaces of the through holes of the black matrix;

An optical sheet is provided to fill the through holes of the black matrix, and to improve the contrast of the plasma display panel including the transparent material film formed on the black matrix.

The second preferred aspect for achieving the above object of the present invention is

Forming a plurality of through holes spaced apart from each other in one axial direction on the black matrix substrate, each having a stripe shape;

Forming a reflective film on inner surfaces of the plurality of through holes;

A method of manufacturing an optical sheet for improving the contrast of a plasma display panel, the method comprising contacting the reflective film, filled between the plurality of through holes, and forming a transparent material film formed under the black matrix substrate. do.

The third preferred aspect for achieving the above object of the present invention is

Preparing a transparent substrate on which a plurality of transparent structures having a width of an upper portion smaller than a width of a lower portion and having a lower portion bonded to each other;

Forming a reflective film on sidewalls of each of the plurality of transparent structures;

A method of manufacturing an optical sheet for improving the contrast of a plasma display panel comprising contacting the reflective film, filling between the plurality of transparent structures, and forming a black matrix on the transparent substrate is provided.

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

FIG. 3 is a perspective view illustrating a schematic configuration of an optical sheet for improving contrast of a plasma display panel according to the present invention. FIG. 3 is a plurality of through holes spaced apart from each other in one axial direction and each having a stripe shape. A black matrix 100 in which the 101 is formed; A reflection film formed on an inner surface of the through holes 101 of the black matrix 100; The transparent material layer 120 formed in the black matrix 100 is filled in the through holes 101 of the black matrix 100.

Here, the through holes 101 of the black matrix 100 are preferably spaced apart from each other and arranged in the Y-axis direction (vertical direction).

That is, the through holes 101 are formed in a rectangular shape having a longer X axis direction (horizontal direction) than the Y axis direction (vertical direction), and are arranged spaced apart at a predetermined interval d1 in the Y axis direction (vertical direction). It is.

Therefore, the optical sheet of the present invention can increase the area of the black matrix 100 by forming a through hole, which is a passage through which the image light of the plasma display panel is emitted, in the black matrix 100 to increase the external incident light absorption rate. It can be increased.

In addition, the image light of the plasma display panel is emitted to the through-holes 101 having a rectangular shape in the horizontal direction, thereby increasing the viewing angle of the user in the large area panel.

4A and 4B are schematic cross-sectional views of an optical sheet for enhancing contrast of a plasma display panel according to the present invention. First, FIG. 4A is a cross-sectional view taken along line AA ′ of FIG. will be.

In this case, when the width W1 of the upper portion of the through holes 101 of the black matrix 100 is formed to be smaller than the width W2 of the lower portion, the amount of light emitted from the plasma display panel may be increased.

4B is a cross-sectional view taken along the line B-B 'of FIG. 3, and the optical sheet is cut in the horizontal direction.

As in the vertical direction, the width W3 of the upper portions of the through holes 101 of the black matrix 100 in the horizontal direction is smaller than the width W4 of the lower portion.

The reflective film 110 is formed on the inner surface of the through-holes 101 of the black matrix 100, fills the inside of the through-holes 101 of the black matrix 100, and below the black matrix 100. The transparent material film 120 is formed.

The width of the through holes of the black matrix is preferably 1 μm to 900 μm.

5 is a perspective view of a state in which an optical sheet for improving contrast of a plasma display panel is mounted on a plasma display panel according to the present invention. First, the optical sheet 150 of the present invention is mounted on the plasma display panel 200.

As described above, the black matrix 100 of the optical sheet 150 absorbs external light transmitted to the outside and passes through the through holes 101 formed in the black matrix 100 of the plasma display panel 200. As the image light is emitted, the contrast is improved.

That is, the absorption of external light is improved by increasing the Black Matrix Ratio, which is the ratio of the area occupied by the black matrix (BM) on the screen, and the loss of the image light output from the plasma display and the amount of light due to the reflection of the reflective film Since it can be increased, the contrast is improved.

FIG. 6 is a schematic perspective view of a unit cell of an optical sheet for improving contrast of a plasma display panel, in which one through hole 101 is formed among the through holes formed in the optical sheet of the present invention. An area in which the unit cell is defined is defined as a unit cell 151.

FIG. 7 is an exploded perspective view of an optical sheet unit cell for improving contrast of a plasma display panel according to the present invention. The unit cell of FIG. 6 has a transparent material structure having a lower width than an upper width in a vertical and horizontal direction. 120); A reflective film 110 surrounding the side of the transparent material structure 120; It is composed of a black matrix 100 surrounding the side of the reflective film 110.

8A and 8B are schematic cross-sectional views of a unit cell of an optical sheet for improving contrast of a plasma display panel according to the present invention. FIG. 8A is a cross-sectional view of a unit cell in a vertical direction, and FIG. 8B is a unit cell in a horizontal direction. In cross-sectional view, the thickness t1 of the black matrix 100, the angles (θx, θy) formed between the reflective film 110 and the surface of the plasma panel and the length Ly of the light-transmitting material structure 120 with respect to the vertical direction are horizontal. The design value of the length Lx of the light-transmitting material structure 120 with respect to the direction, the transmittance and refractive index of the light-transmitting material film 120, the reflectivity of the reflective film 110, the black matrix The transmittance, the viewing angle characteristic, the contrast ratio improvement characteristic, etc. of the optical sheet are determined according to the light absorbance of (100).

Therefore, in the present invention, it is preferable that the horizontal viewing angle is wider than the vertical viewing angle with the large screen, so that the horizontal length Lx of the structure of the translucent material structure 120 of the optical sheet is longer than the vertical length Ly. desirable.

That is, it is preferable that the horizontal length Lx of the through hole is longer than the vertical length Ly.

9A to 9C are cross-sectional views of a manufacturing process of an optical sheet according to a first exemplary embodiment of the present invention. First, the optical sheets are spaced apart from each other in one axial direction on a black matrix substrate 100 and each of the plurality of strips has a stripe shape. Through holes 101 are formed (FIG. 9A).

In this case, the through holes 101 have an upper width smaller than a lower width.

Thereafter, the reflective film 110 is formed on the inner surface of the plurality of through holes 101 (FIG. 9B).

Finally, a transparent material film 120 is formed in contact with the reflective film 110, filled between the plurality of through holes 101, and formed under the black matrix substrate 100 (FIG. 9C). )

FIG. 10 is a conceptual diagram illustrating a principle of improving contrast ratio by the optical sheet for improving contrast of the plasma display panel according to the present invention. First, the optical sheet 150 is positioned on the upper substrate 210 of the plasma display panel. The filter 300 is positioned in the black matrix 100 of the optical sheet 150.

That is, the plasma display panel includes a lower substrate having a plurality of pixels surrounded by partition walls, and an upper substrate positioned above the pixels.

Here, the filter 300 uses one of an anti reflection film, an electromagnetic shield (Electro Magnetic Interference (EMI)) shielding film and a near infrared (Near Infrared, NIR) shielding film.

That is, the non-reflective film prevents light emitted from the plasma display panel from being reflected by the plasma display panel, thereby increasing the amount of light emitted to the outside.

Therefore, the optical sheet according to the present invention is positioned on the front surface of the plasma display panel, thereby blocking external light incident on the optical sheet in the vertical and horizontal directions with the black matrix 100 to prevent the contrast ratio of the plasma display panel from being lowered.

The image light generated by the plasma display panel is emitted to the outside through the through hole of the black matrix 150.

At this time, as described above, since the width of the through-hole in the direction of the plasma display panel is larger than the width of the through-hole in the direction of the filter, the amount of image light of the plasma display panel emitted to the outside is large, and the amount of external light incident from the outside is Becomes small.

In addition, the reflective film 120 is formed on the inner surface of the through hole of the black matrix 150, so that the image light of the plasma display panel may be reflected by the reflective film 120 to increase the amount of image light emitted to the outside.

That is, as shown in FIG. 10, the image light emitted from the pixel 220 of the plasma display panel surrounded by the partitions 231 and 232 is emitted to the outside through the through holes and the filter 300 of the black matrix 150. do.

Here, it is preferable that there are a plurality of through holes corresponding to the pixel areas of the plasma display panel.

At this time, the 'B' light traveling through the path not in contact with the reflective film 120 passes through the through hole, and the 'C', 'D', 'E', traveling through the path in contact with the reflective film 120, 'F' and 'G' light is reflected by the reflective film 120 and passes through the through hole.

Therefore, in the optical sheet of the present invention, since the black matrix 150 has an inverted triangle structure in the direction of the plasma display panel, the amount of image light output can be increased.

In addition, since the area of the black matrix 150 is large, the absorption rate of external light ('A' light) may be increased.

Here, the black matrix 150 uses any one of black resin, carbon black, conductive black multiplex, and blackened metal.

The reflective film 120 is made of metal having high reflectivity and low electrical conductivity.

As such, when a conductive material such as carbon black, a conductive black multiplex, or a black metal is used as the black matrix, or a metal is used as the reflective film, an additional function for shielding electromagnetic waves emitted from the plasma display panel may be additionally performed. Can be. That is, in the existing plasma display panel configuration, it is possible to replace the function of the metal mesh for shielding electromagnetic waves (EMI).

Therefore, the optical sheet of the present invention is to provide both the optical function of the contrast ratio improvement and the electromagnetic function of the electromagnetic shielding, there is an economic advantage that can minimize the manufacturing cost.

11A to 11C are cross-sectional views of a manufacturing process of the optical sheet according to the second embodiment of the present invention, in which the upper width W5 is smaller than the lower width W6, and the upper portions are spaced apart from each other in one axial direction, and the lower portions are A plurality of transparent structures 410, which are attached to each other and have a stripe shape, are prepared on the transparent substrate 400 formed thereon (FIG. 11A).

That is, as shown in FIG. 12, a transparent transparent structure 410 having a stripe shape is formed on the transparent substrate 400.

Subsequently, a reflective film 420 is formed on sidewalls of each of the plurality of transparent structures 410 (FIG. 11B).

Finally, the reflective layer 420 is contacted, filled between the plurality of transparent structures 410, and a black matrix 430 is formed on the transparent substrate 400 (FIG. 11C).

As described in detail above, the present invention improves the absorption of external light by increasing the Black Matrix Ratio, which is the ratio of the area occupied by the black matrix (BM) on the screen, and improves the absorption of external light, Since the loss of the output image light can be reduced and the amount of light can be increased, the contrast can be improved to maximize the viewer's satisfaction by improving the image level of the plasma display panel.

In addition, the present invention has the effect of increasing the viewing angle of the user in a large area panel by forming a passage in which the image light of the plasma display panel is output in a rectangular shape in the horizontal direction.

In addition, the present invention has the effect of shielding electromagnetic waves emitted from the plasma display panel by using a black matrix using a conductive material or using a reflective film as a metal.

Although the invention has been described in detail only with respect to specific examples, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

Claims (12)

A black matrix spaced apart from each other in one axial direction and having a plurality of through holes formed in a stripe shape; A reflective film formed on inner surfaces of the through holes of the black matrix; An optical sheet for filling the inside of the through-holes of the black matrix, and improving the contrast of the plasma display panel comprising a transparent material film formed in the black matrix. delete The method of claim 1, The optical sheet for improving the contrast of the plasma display panel, characterized in that the filter is further provided on the black matrix. The method of claim 3, wherein The filter, An optical sheet for improving contrast of a plasma display panel, characterized in that it is one of an anti reflection film, an electromagnetic interference (EMI) shielding film, and a near infrared (NIR) shielding film. The method of claim 1, The black matrix, An optical sheet for improving contrast of a plasma display panel, which is any one of black resin, carbon black, conductive black multiplex, and black metal. The method of claim 1, The reflective film, It is a metal, The optical sheet which improves the contrast of the plasma display panel. The method of claim 1, The width of the through holes of the black matrix, It is 1 micrometer-900 micrometers, The optical sheet which improves the contrast of a plasma display panel. Forming a plurality of through holes spaced apart from each other in one axial direction on the black matrix substrate, each having a stripe shape; Forming a reflective film on inner surfaces of the plurality of through holes; And forming a transparent material film in contact with the reflective film and filled between the plurality of through holes and formed under the black matrix substrate. The method of claim 8, The through holes, The width of the upper part is smaller than the width of the lower part, The manufacturing method of the optical sheet which improves the contrast of a plasma display panel. Preparing a transparent substrate on which a plurality of transparent structures having a width of an upper portion smaller than a width of a lower portion and having a lower portion bonded to each other; Forming a reflective film on sidewalls of each of the plurality of transparent structures; And forming a black matrix on the transparent substrate in contact with the reflective film, filling the plurality of transparent structures, and forming a black matrix on the transparent substrate. The method according to any one of claims 8 to 10, The black matrix, The manufacturing method of the optical sheet which improves the contrast of the plasma display panel characterized by any one of black resin, carbon black, a conductive black multiplex, and a blackening metal. The method according to any one of claims 8 to 10, The reflective film, It is a metal, The manufacturing method of the optical sheet which improves the contrast of a plasma display panel.

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