JPH0820635B2 - Color filter device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter device, and more particularly to a color filter device used in a liquid crystal display device or an electroluminescence display device and provided with a black matrix for improving contrast.

[0002]

2 to 4 are sectional views showing a conventional example of a color filter device for a color liquid crystal display.

In FIG. 2, a black resist (a black pigment dispersed in a binder or a solvent) is formed on a glass substrate 1 by a photolithography process to provide a black matrix (light-shielding layer) 2, and further, The color filter layer 3 is formed by a photolithography process,
After forming the protective film / smoothing layer 4 on the entire surface from above, the transparent common electrode 5 is formed.

In FIG. 3, metal chromium is formed on a glass substrate 1 by a photolithography process to provide a black matrix 6, and a color filter layer 3 is further formed by a photolithography process. After forming the protective film / smoothing layer 4, the transparent common electrode 5 is formed.

In FIG. 4, two layers of chromium oxide 7 and metal chromium 8 are formed on a glass substrate 1 by a photolithography process to form a black matrix, and a color filter layer 3 is further formed by a photolithography process. After forming the protective film / smoothing layer 4 on the entire surface from above, the transparent common electrode 5 is formed.

2 to 4, a liquid crystal layer (not shown) and a pixel electrode are formed on the electrode layer 5 to form a color liquid crystal display device.

[0007]

The black matrix 2 made of black resist is a dispersion layer of fine particles,
Unlike a metal thin film, it is a dispersion system in which incident light is diffusely reflected inside. Therefore, the light transmittance is relatively high, and a thickness of at least 1 μm is required to obtain the effect as the light shielding layer. When the black matrix 2 has a thickness of 1 μm or more, as shown in FIG. 2, a non-negligible step is formed on the color filter layer 3, the protective film 4 and the electrode layer 5 on the black matrix 2 to maintain the flatness of the filter. Can not be. The gap control of the liquid crystal cell is performed by sandwiching the gap control material between the substrates. However, when the gap control material is arranged at the overlapping portion of the black matrix and the color filter layer, a gap defect occurs. In this case, if pressure is forcibly applied to control the gap, the gap control material bites into the filter layer, and the filter layer is peeled off. The peeling of the filter layer is accompanied by the peeling of the pixel electrode thereon. The peeled electrode may come into contact with the other electrode to cause display failure.

In FIG. 3, metal chromium is used as a black matrix instead of the black resist. Metallic chromium has a very low light transmittance, and even if it is thin, it functions as a light shielding layer. However, since metal chrome has a high light reflectance, for example, when the lower side of FIG. 3 is the display surface, the background light is reflected by the black matrix 6. For example, the light of the face of the person watching the display, the Y-shirt, the illumination of the ceiling, or the like is reflected by the black matrix to make it difficult to see the important display image, thus deteriorating the display quality.

In FIG. 4, the black matrix has two layers of chromium oxide and metallic chromium. The metallic chromium layer 8 blocks light with a thin thickness and prevents the background light from being reflected by the chromium oxide layer 7. It was an attempt to solve it by using it as a film. However, in this case, the adhesion of chromium oxide to the substrate glass plate 1 is poor and there is a problem of peeling. Further, it is difficult to reduce the reflectance in the entire visible region with a single-layer antireflection film.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a color filter device having a black matrix having a film thickness as thin as possible and having no problems of reflection and peeling.

[0011]

In a color filter device which achieves the object of the present invention, a black matrix is a transparent substrate.
The black resist layer formed on the plate and the black resist layer formed on the layer.
A two-layered structure of a metal layer formed by the above method.

[0012]

[Function] The metal layer has a small film thickness to provide a sufficient light-shielding effect, and the black resist layer has good adhesion to the transparent substrate and is a diffusion system that absorbs and diffuses incident light. Has the effect of preventing the reflection of.

[0013]

1 is a sectional view of an embodiment of a color filter device of the present invention. A black resist layer is formed on the glass substrate 1 and patterned by a photolithography process to form a pattern of the black resist layer 9 having a thickness of about 0.1 μm. Next, metal chromium or metal molybdenum is sputtered to form a metal layer having a thickness of 0.1 to 0.2 μm and patterned by a photolithography process to form a pattern of the metal layer 10.

The black resist layer and the metal layer may be first laminated and then patterned by the same mask. It can also be a self-alignment process.

In this way, a black matrix consisting of two layers of black resist and metal is formed. The step due to the black matrix is preferably within 1 μm, and it is more preferable that it is smaller.

Further, a color filter layer 3 having a thickness of 1.0 to 2.0 μm is formed thereon by a photolithography process. The color filters are, for example, three sets of red, green and blue. After a protective film / smoothing layer 4 having a thickness of 1.0 to 2.0 μm is formed on the entire surface of the color filter by spin coating or roll coating, ITO is formed.
(Indium tin oxide film) The transparent common electrode 5 is formed by sputtering. In this way, the color filter device of FIG. 1 is obtained.

The present invention has been described above with reference to the embodiments.
The present invention is not limited to these. For example,
It will be apparent to those skilled in the art that various changes, improvements, combinations and the like can be made.

[0018]

EFFECTS OF THE INVENTION Since the black matrix has a two-layer structure of a black resist layer and a metal layer, the metal layer provides a sufficient light-shielding action with a thin film thickness, and the black resist layer has good adhesion to a transparent substrate. Moreover, the incident light is diffused to prevent the background light from being reflected by the metal layer, and a color filter device having high display quality and high reliability can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a color filter device according to the present invention.

FIG. 2 is a cross-sectional view of a first example of a conventional color filter device.

FIG. 3 is a cross-sectional view of a second example of a color filter device according to the related art.

FIG. 4 is a cross-sectional view of a third example of a color filter device according to the related art.

[Explanation of symbols]

 1 Glass Substrate 2, 9 Black Resist Layer 3 Color Filter Layer 4 Protective and Smoothing Film 5 Transparent Common Electrode 6 Metal Chromium Layer 7 Chromium Oxide Layer 8 Metal Chromium Layer 10 Metal Layer

Claims (2)

[Claims] And 1. A transparent substrate, a black matrix formed on the transparent substrate, a color filter device having a color filter formed between the lattice of the black matrix, the black matrix is light
Formed on a transparent substrate so that it has a two-layer structure in the incident direction.
Black resist layer formed and metal formed on the layer
Color filter device including a two-layer structure of layers . 2. The color filter device according to claim 1, wherein the metal layer is made of a chromium or molybdenum material.