JPS62153902A - Production of color filter for liquid crystal display body - Google Patents

Abstract

PURPOSE:To obtain a color filter having a black matrix which has high accuracy and large black chromaticity by forming the matrix of a photosensitive resin on a transparent substrate and providing a black color layer by a printing method thereon. CONSTITUTION:The photosensitive resin 2 of a negative type is coated on the transparent substrate 1 and is exposed by using a photomask 3 designed to prevent the irradiation of light to the parts to be preliminarily formed with picture elements and to irradiate the light only to the parts to be formed with the black matrix. The matrix 4 of the resin is formed only on the parts to be formed with the black matrix when the resin is developed. The black part 5 is then provided on the matrix by a printing method using a color material contg. carbon. The picture element parts are thereafter subjected repeatedly to stages for coating, exposing and dyeing by using, for example, dyeable resins to provide picture element for RGB colors or the picture element for RGB colors are directly provided on the picture element part by the printing method.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a color filter for a liquid crystal display used in a color liquid crystal display device in which a color filter and a liquid crystal are combined.

Conventional technology Color filters for liquid crystal displays have traditionally been made by coating a dyeable photosensitive resin on a transparent substrate and exposing it to light using a photomask designed in advance to pass light from the pixel area to form a relief in the pixel area. After that, it is dyed with a dye dispersion etc., and R
, G, and B pixels. Furthermore, means have also been used in which R, G, and B pixels are directly formed on a transparent substrate by means such as printing.

Problems that the invention aims to solveAccording to methods such as dyeing, it is difficult to dye the black matrix part created between pixels black with negative colors, and it is difficult to dye black with a negative color. This can lead to uneven dyeing.

Furthermore, according to the printing method, there is no reproducibility with thin lines of about 20 to 30 μm, resulting in thick and thin portions. In addition, blurring occurs where the matrices intersect, and if the area of the pixel is small, it may become blurred.

A solution to the problem is to form a matrix using a photosensitive resin on a transparent substrate, and then apply a black layer on top of the matrix using a printing method to form a plastic matrix. form.

By forming the parts that will become the plastic matrix using photosensitive resin, a matrix with high precision can be formed. By providing a black portion on the matrix by a printing method, a black matrix with a high degree of blackness can be easily formed.

Next, a pixel portion is formed using a dyeable photosensitive resin.
Alternatively, a color filter with high contrast can be made by forming the pixel portion using a printing method.

EXAMPLE An example of the present invention will be described below. Figure 1 (A
), first, a negative type photosensitive resin 2 (gelatin, ammonium dichromate) is coated on a transparent substrate 1 by a method such as a spin code. Next, as shown in (B), exposure is performed using a photomask 3 designed in advance so that light does not hit the area where pixels are to be formed and only the area where the plastic matrix is to be formed is exposed. Do the following.

When development is carried out as shown in (C), a resin matrix 4 is formed only in the area where the black matrix will be formed. As shown in (D), a black part 6 is provided on the upper part of the IJ box by a printing method using a coloring material containing carbon.

As the coloring material for forming the black part, ink or synthetic resin containing black iron oxide, ink containing carbon black, synthetic resin, or natural resin is used.

Coloring materials containing carbon black have a very high degree of blackness and are desirable as a black matrix.

After that, the steps of coating, exposing, and dyeing are repeated using, for example, a dyeable resin in the pixel portion to provide pixels of each color of RGB. Alternatively, R(
, B may be provided.

FIG. 2 shows a cross-sectional side view of a liquid crystal panel of a color liquid crystal device using the color filter of the present invention.

A liquid crystal 6 is sandwiched between transparent substrates 1 and 1'. On the upper transparent substrate 1, a color filter 5 and a common electrode 8 formed of a transparent electrode film are laminated in order. A pixel electrode 9 formed of a thin film field effect transistor (hereinafter abbreviated as TPT) and a transparent conductive film driven by the TPT is supported on the lower transparent substrate 11 . Polarizing plates 1o and 10' are arranged so that their polarization axes are parallel to each other. The alignment of liquid crystal molecules is controlled by the alignment films 11 and 11.

With the liquid crystal panel configured as described above, when white light is irradiated from below and at the same time the TPT is driven according to the pixel signal and the voltage applied to the liquid crystal layer is changed, the amount of light passing through the liquid crystal layer changes accordingly. and a color image is reproduced.

Effects of the Invention According to the present invention, after forming an IJ mask using a photosensitive resin, a black part is provided using a coloring material containing carbon by a printing method, thereby achieving high precision and a high degree of blackness. A color filter with a black matrix can be created.

[Brief explanation of drawings]

6 Heh. FIG. 1 is a cross-sectional view showing the process of manufacturing a color filter for liquid crystal display according to the present invention, and FIG. 2 is a cross-sectional view of a liquid crystal panel of a color liquid crystal display device using the color filter for liquid crystal display according to an embodiment of the present invention. It is a horizontal view. 1... Transparent substrate, 2... Photosensitive resin,
3...Photomask, 4...Matrix, 5...Black part.

Claims (2)

[Claims] (1) A process of forming a matrix with a photosensitive resin on a transparent substrate, forming a black part by printing a black part on the top of the matrix to form a black matrix, and a process of forming pixel parts in the gaps between the black matrix. A method for producing a color filter for a liquid crystal display, comprising: (2) The method for producing a color filter for a liquid crystal display according to claim 1, wherein the black portion contains carbon.