Color liquid crystal display panel

Abstract

First and second transparent substrates which are arranged to face each other are provided to a color liquid crystal display panel. A liquid crystal layer is provided between the first and the second transparent substrates, A plurality of thin film transistors are provided on the first transparent substrate. An insulation film provided on the first transparent substrate so as to cover the thin film transistors. A color filter which includes first to third color layers stacked on the insulation layer is provided. A contacting color layer is provided on the insulation film in a region above the thin film transistors. The contacting color layer has at least one color layer selected from a group of composed of the first to third color layers. A black matrix is provided on the contacting color layer. The black matrix has opening portions for transmitting light from the color filter.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to a color liquid crystal display panel which comprises thin film transistors, and more particularly, to a color liquid crystal display panel in which a tight contact between a black matrix and an underlying member is improved so as to achieve high fineness.[0003] 2. Description of the Related Art[0004] A color liquid crystal display panel comprises two glass substrates and a liquid crystal layer which is disposed between the glass substrates. In general, in a panel of the thin film transistor (TFT; Thin Film Transistor) type, color layers of three colors (red, green and blue) are formed on a counter glass substrate which is faced with a TFT-side glass substrate which seats TFTS. However, since such a structure demands large margins for a black matrix which is disposed between adjacent inter-pixel opening portions to improve contrast, it is difficult to enhance the fineness of the panel with this structure.[0005] A...

AI Technical Summary

Problems solved by technology

However, since such a structure demands large margins for a black matrix which is disposed between adjacent inter-pixel opening portions to improve contrast, it is difficult to enhance the fineness of the panel with this structure.

Since the width used under the optimal condition for development (development margin) of the black resin film is extremely narrow, there is a problem in that the black resin film easily falls off the insulation film 109 while being developed.

The black resin film falls off because the black resin film at its surface portion absorbs light during patterning by photolithography and thus fails to be sensitized inside.

Although improvement is possible to a certain extent if the black resin film is formed as a thin film, this solution leads to a new problem of lowered optical density.

Further, in an effort to increase an optical density, an increased carbon content results in a trade off in that a ratio of an acrylic component, which contributes to a tight contact with the underlying member, decreases and hence a contact capability decreases.

This is another problem in that it is difficult to enhance an optical density, namely, a light shielding capability for the purpose of obtaining excellent contrast.

However, even if such a laminated member is used on a TFT-side glass substrate as an alternative to a black matrix, sufficient shielding of light is not achieved, and therefore, an OD value decreases and contrast accordingly decreases.

However, in such a color filter, since a light shielding rate becomes different depending on the color of the adjacent color layer, a contrast of a displayed image varies, and hence, the image appears uneven.

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