JPH02146502A - Color filter for liquid crystal display - Google Patents

Abstract

PURPOSE:To prevent the voltage drop of an input voltage and to improve image quality by continuously bisecting only the parts in parallel with striped transparent electrodes by each of the respective lines or rows of picture elements to a stripe shape and forming one thereof of a metal having a large electrical conductivity and the other of a metal oxide or resin having a high insulating rate. CONSTITUTION:Plural pieces of the picture elements 2 are installed in checkerwise onto a substrate 1 and meshed black matrices 3 are installed between the respective picture elements. Only the parts of the black matrices 3 in parallel with the striped transparent electrodes 4 are continuously bisected to the stripe shape. The one thereof is formed of the metallic wiring 7 having the large electrical conductivity and the other of the resin having the high insulating rate. The metallic wiring 7 and resin 8 are formed of a material having a high light shielding property. The image quality of the large-sized liquid crystal display is improved and the cost thereof is reduced in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a color filter used in a liquid crystal display, and in particular, among many liquid crystal display driving methods, an active matrix method using a two-terminal element and a color filter used in a liquid crystal display. This invention relates to color filters used in simple matrix liquid crystal displays.

2. Description of the Related Art As an example of a color filter used in active matrix liquid crystal displays and simple matrix liquid crystal displays using two-terminal elements, an example in which pixels are arranged in a checkered pattern is shown in FIGS. 2(a), 2(b) and As shown in FIG. 3, pixels 2 are arranged in a checkered pattern on a substrate 1, and a mesh-like black matrix 3 is arranged between each pixel. There are two structures of this black matrix 3 as shown in FIGS. 2 and 3, and FIG. It is a constructed structure. FIG. 3 shows a two-layer structure consisting of a metal layer 5 with a high light-shielding property and a material 6 with a high insulation property. A striped transparent electrode 4 made of ITO or the like is formed on the pixels 2 and part of the black matrix 3 independently for each column or row of pixels in a straight line.

Problems to be Solved by the Invention By the way, the striped transparent mold shown in Figs. 2 and 3! ! l! 4 plays an important role in applying an electric field to the liquid crystal.

Here, since the terminal for applying voltage to the transparent electrode 4 is installed at the periphery of the liquid crystal display, a voltage drop is lower than the input voltage at the center of the display due to the resistance of the transparent electrode 4. Therefore, the image quality changes between the periphery and the center. Particularly in large displays, the voltage drop is large and deterioration of image quality is a major problem. Here, one method for reducing the resistance of the transparent electrode 4 is to increase the thickness of the transparent electrode 4. FIG. 4 shows the relationship between the film thickness and sheet resistance of the ITO transparent electrode 4. When the screen size of a liquid crystal display is about 10” or more, the sheet resistance is 10Ω.
The film thickness must be several thousand Å or more. The transparent electrode 4 is made by a thin film forming process such as sputtering, and when forming a film with a thickness of several thousand Å or more, the transparent electrode 4 is
The temperature of the pixel 2 rises above the allowable temperature limit of the pixel 2, and the pixel 2 deteriorates. Therefore, the manufacturing yield of large-area color filters was low, and the image quality was also poor.

The color filter for liquid crystal displays of the present invention solves the above problems, and aims to improve the quality of the color filters for liquid crystal displays, prevent voltage drop in the input voltage of the liquid crystal display, and improve image quality. do.

Means for Solving the Problems The color filter for a liquid crystal display of the present invention includes a plurality of pixels arranged in a checkered or staggered pattern on a substrate,
A mesh-like black matrix is installed between each pixel of this pixel, and stripes are installed independently for each row or column of multiple pixels on the pixel and in a part of the black matrix near the pixel. Consisting of a transparent electrode, only the part parallel to the pole of the precursor stripe-like transparent electrode of the black matrix is continuously divided into two stripes for each row or column of pixels, one of which is made of a metal with high conductivity,
The other is made of metal oxide or resin with high insulation rate,
These metals, metal oxides, substances, or resins are used as materials with high light-shielding properties.

Effects According to the above configuration, the input voltage applied from the periphery of the liquid crystal display flows through the highly conductive metal striped part of the black matrix, so the voltage drop is small and the input voltage applied from the periphery of the liquid crystal display is small. However, almost the same voltage as the surrounding area is applied to the liquid crystal. Furthermore, since the transparent electrode does not need to be thick, there is no deterioration of the pixel due to the rise in temperature of the substrate during formation of the transparent electrode.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. FIG. 1 is a schematic view of the color filter for liquid crystal display of the present invention, FIG. 1(a) is a plan view, and FIG. 1(b) is an A.
-A sectional view. A plurality of pixels 2 are arranged in a checkered pattern on a substrate 1.
are installed, and a mesh-like black matrix 3 is installed between each pixel. In this figure, ITO (Indium TinOxide) is applied linearly in the vertical direction, that is, independently in stripes for each column of a plurality of pixels 2, on the pixels and in a part of the black matrix near the pixels.
) etc. transparent type f! 4 are installed.

Here, the black matrix 3 is divided into two parts in parallel to the striped transparent mold @4, that is, in FIG. The metal wiring 7 and the resin 8 are made of a material with a high light-shielding property.For example, the metal wiring 7 is made of Cr, and the resin 8 is made of acrylic resin containing carbon. be. The striped metal 7 and the transparent mold ft4 are in contact with each other as described above and are in a conductive state.

In the example shown in FIG. 1, the pixel arrangement is in a checkered pattern, but in the case of a staggered pixel arrangement, the transparent electrode 4 and the striped metal wiring 7 are continuous in the vertical direction in a zigzag pattern along the pixel arrangement. become.

The effects of this embodiment will be described below.

The voltage input from the terminals attached to the periphery of the liquid crystal display flows through the striped metal wiring part 7 of part of the black matrix 3, so the voltage drop due to resistance is small and the voltage drop between the center and the periphery of the liquid crystal display is small. An equivalent voltage is applied to the liquid crystal. Therefore, even if the display becomes larger, uniform image quality can be obtained over the entire surface, and the thickness of the transparent pole 4 does not need to be increased.
High-quality color filters can be produced with high yield without deterioration of pixels during the formation of transparent electrodes.

Effects of the Invention The color filter for liquid crystal displays of the present invention makes it possible to increase the size of color filters, which was one of the problems when increasing the size of liquid crystal displays, and makes it possible to quickly increase the size of future liquid crystal displays. It is also highly effective in improving quality and yield during the manufacture of large color filters, making it possible to improve the image quality and reduce costs of large liquid crystal displays.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are a plan view and a cross-sectional view taken along the line A-A, and FIG. 2(a) shows a schematic configuration of a color filter for a liquid crystal display according to an embodiment of the present invention. (b) is a diagram showing a conventional color filter for a liquid crystal display. 1...Substrate, 2...Pixel, 3. Coma matrix, 4...Transparent electrode, 7 Wiring, 8...Resin Name of agent Patent attorney Shigetaka Awano, Metal, and 1 other person Foil 2 Diagram ( (L) (b)

Claims (1)

[Claims] A plurality of pixels arranged in a checkerboard or staggered pattern on a substrate, a mesh-like black matrix installed between each of the pixels, and each row or column of the plurality of pixels independently arranged. The black matrix consists of transparent electrodes installed in stripes on the pixels and in a part of the black matrix near the pixels, and only the portions of the black matrix parallel to the stripe-shaped transparent electrodes are connected to each row or column of the pixels. Each area is continuously divided into two stripes, and one side is made of a metal with high conductivity and the other is made of a metal oxide or resin with a high insulation rate. Color filter for liquid crystal display used as material.