JPH03120502A - Color filter and production thereof - Google Patents

Abstract

PURPOSE:To lower the reflection of light shielding parts and to provide an easily visible display by roughening the boundary faces between a transparent substrate and the light shielding parts. CONSTITUTION:The light shielding parts 15 are formed on the glass substrate 12 and the boundary faces 26 between the substrate 12 and the light shielding parts 15 are roughened. The light shielding parts 15 delineate windows 16 of prescribed patterns and dyed layers 17, 18, 19 or color display are formed on these windows 16 to three primary colors; red, green and blue. The surfaces of the dyed layers 17, 18, 19 are coated with a protective layer 21 for the org. dyed layers. Transparent electrodes 22 made of ITO are provided thereon and are patterned. A protective film 27 is pro vided thereon. The color filters constituted in such a manner are disposed on the lower side thereof, by which a liquid crystal display is constituted. The surface roughening of the boundary faces 26 is executed by patterning and coating the non- surface roughened parts with a resist by using, for example, a photolithography stage and dissolving the parts which are not coated with the resist by hydrofluoric acid, etc., then removing the resist and cleaning the surfaces. The reflection of the boundary faces 26 between the subtrate 12 and the light shielding parts 15 is lowered in this way and, therefore, easily visible display is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color filter and a method of manufacturing the same, and relates to a color filter that enables color display by being used in a liquid crystal display device, for example, and a method of manufacturing the same.

[Prior Art] One type of liquid crystal display device capable of color display uses a color filter. A typical structure thereof is shown in FIG. 4, in which a liquid crystal 14 is sealed between a pair of glass substrates 11 and 12 using a sealing member 13. A light shielding portion (light shielding film>15) is formed on the lower substrate 12, and a predetermined pattern of windows 16 is formed on the lower substrate 12.
is defined. On this window 16 is a dyed layer for color display (
Color filter layers) 17, 18, and 19 have been created.

For example, it is a dyeing layer of the three primary colors of red (R), green (G), and blue (B), and the three dyeing layers form one unit to form one pixel that displays a composite color. An organic dye layer protective film 21 covers the dye layers 17, 18, and 19, and the lower substrate 1 is placed on top of the organic dye layer protective film 21.
17. 18. A transparent electrode made of indium tin oxide (ITO) that is a common electrode for one color display layer f!
22 are provided and patterned. Furthermore, a surface protection film 27 is provided on the transparent electrode 22. A thin film transistor 24 is formed on the upper substrate 11.

The light shielding section 15 is also called a black matrix or a black mask, and is used to prevent unnecessary light from passing through and increase display contrast. The light shielding portion 15 is made of chromium Cr, molybdenum MO, aluminum Aj, or other metals.

Furthermore, the finer the pattern, the larger the area occupied by the light-shielding portion, and the greater its influence.

SUMMARY OF THE INVENTION An object of the present invention is to provide a color filter for a liquid crystal display device that can be produced by a simple method, has less light reflection at a light shielding part, and is easy to see the display, and a method for manufacturing the same.

[Means for Solving the Problems] A portion of the surface of a transparent substrate where a light shielding portion serving as a black matrix is to be formed is roughened, and a light shielding portion is formed in this roughened portion. After that, a dyed layer is formed.

[Problems to be Solved by the Invention] Metals such as Cr and Mo that form the light shielding part 15 have a high reflectance, and the light shielding part made of these materials occupies about half the area of the display surface. , the overall specular reflection of the metal on the glass substrate increases, making the display difficult to see in bright places. Special effect: By roughening the interface between the transparent substrate and the light shielding part,
The metal such as Cr of the light shielding portion formed thereon is used as a scattering surface to eliminate specular reflection and make the display easier to see.

[Embodiment] FIG. 1 shows a color filter according to an embodiment of the present invention.A light shielding portion 15 is formed on a glass substrate 12, and an interface 26 between the glass substrate 12 and the light shielding portion 15 is roughened. ing. The light shielding part 15 defines a predetermined pattern of windows 16 on which dyed layers 17, 18, 19 for color display are created.

For example, it is a dyeing layer of the three primary colors of red (R), green (G), and blue (B), and the three dyeing layers form one unit to form one pixel that displays a composite color. An organic dye layer protective film 21 covers the dye layers 17, 18, and 19, and the lower substrate 1 is placed on top of the organic dye layer protective film 21.
Transparent f made of indium tin oxide (ITO) which is a common electrode for all color display dyeing N117.18.19 of 2.
! 22 are provided and patterned. moreover,
A protective film 27 is provided thereon. The color filter constructed as described above is disposed on the lower side, and the liquid crystal display device of FIG. 2 is constructed in the same manner as that of FIG. 4.

Such a color filter is, for example, a third-order (A)
It is produced by the following procedure shown in ~(H).

A portion of the surface of the glass substrate 12 where the light shielding portion 15 is to be formed is roughened. There are the following methods to reduce the cost to ¥1.

(2) As shown in FIG. 3(A), the non-rounded portion is patterned and covered with a resist 31 using a photophosphorographic process.

(2) As shown in FIG. 3(B), the portion 26 not covered with the resist 31 is roughened by dissolving it by acid treatment such as hydrofluoric acid or by spraying polishing powder or the like with a sand plaster.

(2) As shown in FIG. 3(C), the resist is removed and cleaning is performed.

The subsequent steps from FIG. 3 (D> to (H)) are the same as in the prior art. That is, as shown in FIG. 3 (D),
Cr and M by sputtering.

A thin metal film such as the above is formed on the entire surface, and a light shielding portion 15 is formed in a portion (lattice shape) 26 that has been roughened by a photophosphorographic process. Here, not only the lower surface but also the upper surface of the metal thin film 15 is a zero-order scattering surface.
As shown in Figure (E), RGB color dyeing layer 17.18.1
form 9. As shown in FIG. 3(F), an organic color dye layer protective layer 21 is coated over the entire surface, covering the color dye layers 17, 18, and 19. The material is, for example, an acrylic or silicone resin.As shown in FIG. A common electrode is formed by patterning using a lithographic process. As shown in FIG. 3(H), an 8102 film is formed as a surface protective layer thereon in a manner equal to or greater than 0, thereby obtaining the structure of the color filter shown in FIG. 1.

[Effect of the invention] In a liquid crystal display device having a light shielding part (black matrix), by roughening the interface between the transparent substrate and the light shielding part, reflection is reduced as the light shielding part wp scattering surface, making the display easier to see. can do.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a color filter according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a liquid crystal display device using the color filter of FIG. 1, and FIGS. 3(A)-(H) are , FIG. 1 is a cross-sectional view for explaining the manufacturing process of a color filter, and FIG. 4 is a cross-sectional view of a liquid crystal display device according to the prior art. Explanation of symbols 11.12 Substrate 13 Sealing member 14 Liquid crystal 15 Light shielding film 16 Window 17.18.19 Dyeing layer 1 2 4 6 7 Organic protective film Transparent electrode PT Interface protection 1iIJII

Claims (2)

[Claims] (1) The transparent substrate includes a transparent substrate, a light-shielding portion formed on the transparent substrate and forming a black matrix, and a dyed layer formed on a portion of the transparent substrate other than the light-shielding portion; A color filter characterized in that an interface with the light shielding portion is roughened. (2) A step of roughening a portion of the surface of the transparent substrate that forms a light-shielding portion that will become a black matrix, a step of forming a light-shielding portion on the roughened portion, and a step in which the light-shielding portion is not formed. A method for manufacturing a color filter, comprising the step of forming a dyed layer on a portion.