JPS61221702A - Production of color filter - Google Patents

Abstract

PURPOSE:To easily produce the titled filter by selectively transferring a dyestuff or a pigment to a prescribed position of the transparent substrate from a sheet coated with the substance predispersed the dyestuff or the pigment. CONSTITUTION:A porous layer 2 is formed on the transparent substrate 1 to permeate the pigment to the substrate in an after step. The refractive index of the layer 2 is preferable to be almost the same to that of a wax dispersed the pigment, because of scattering the light due to a large difference of the refractive index, when the light passes the titled filter. The pigment is transferred to the prescribed position on the transparent substrate 1 by contacting the sheet 3 dispersed the pigment with the transparent substrate 1 and by heating the substrate with a thermal head 4 from the upperward, thereby forming the colored layer 5 by permeating the pigment into the porous layer 2. by repeating the treatment mentioned above, using the sheet 3 contg. the different sorts of the dyestuffs, the three colored filter is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing an optical filter in which multicolored parts are arranged in a fine mosaic or stripe pattern, and is attached to the front of a color video camera for color separation. The present invention relates to a method of manufacturing a color filter for displaying a color image, or a color filter used in combination with a transmissive liquid crystal panel for color display.

2. Description of the Related Art A conventional method for manufacturing a mosaic or striped multicolor color filter will be described with reference to FIG. FIG. 2 is a cross-sectional view showing the process of a conventional example, where 21 is a transparent substrate, 22
23 is a photosensitive gelatin film, 23 is a mask, 24 is a light transmitting part of the mask, 26 is an island to be dyed, 26 is a resisting layer,
27 is a red area, 28 is a green area, and 29 is a blue area.

First, as shown in FIG. 2A, a photosensitive gelatin film 22 is coated on the entire surface of a transparent substrate 21. Next, as shown in FIG. 2B, the gelatin film 22 is exposed to light using a mask 23, but only the light transmitting portions 24 of the mask 23 are exposed. After that, if the film is developed with hot water, only the areas of the islands 25 will remain. In this state, if the area of the island 25 is dyed with a dissolved red dye, the area of the island 25 will be dyed red. Next, as shown in the second diagram, a resist dyeing layer 26 is formed on the entire surface, and again as shown in Figure 2 A to D.
By repeating the above steps, the color filter shown in FIG. 2E can be obtained.

2 Problems to be Solved by the Invention This conventional method requires an expensive mask alignment device and an expensive mask, and requires a filter (for example, a 30 crn square substrate) used for a liquid crystal panel with a pitch of about 100 μm.
In this case, there is a cost problem.

In other words, if you want to make a three-color filter of red, green, and blue,
Requires at least 3 masks. This is not only an issue of cost, but also an issue of the time required to create the mask.

The present invention solves these problems and makes it possible to easily obtain color filters without using expensive masks.

Means for Solving the Problem In order to solve this problem, the present invention selectively transfers the dye or pigment from a sheet coated with a substance in which the dye or pigment is dispersed to predetermined positions on a transparent substrate. This is how it was done.

Effect: This configuration makes it possible to easily create complex color mosaic filters without using expensive masks.

Embodiment FIG. 1 is a cross-sectional view of a process according to an embodiment of the present invention.
In the figure, 1 is a transparent substrate, 2 is a transparent porous layer, 3 is a sheet coated with wax in which pigments are dispersed, 4 is a thermal head, 6 is a colored layer, 6 is a red area, 7 is an edge area, 8
is the dorsal area.

A porous layer 2 is formed on a transparent substrate 1 as shown in FIG. 1A. The porous layer 2 is necessary for impregnating the pigment in a later step, and its refractive index is preferably approximately equal to the refractive index of the wax in which the pigment is dispersed. This is because when light passes through, if the refractive index differs too much, the light will be scattered. Next, as shown in FIG. 1B, the sheet 3 in which the pigment is dispersed is brought into contact with the transparent substrate 1 and heated from above by the thermal head 4 to transfer the pigment to a predetermined location on the transparent substrate 1. The pigment penetrates into the porous layer 2 to form a colored layer 5. By repeating the process shown in FIG. 1B using sheets 3 containing different types of pigments, the first
A three-color filter can be obtained as shown in Figure C.

Effects of the Invention As described above, according to the present invention, a multicolor color filter can be easily manufactured without using an expensive mask. Furthermore, according to this method, if a large thermal head can be made, a large color filter can be made without using expensive equipment.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a process of a method for manufacturing a color filter according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a conventional process. 1... Transparent substrate, 2... Porous layer, 3
...Sheet, 4...Thermal head,
5...Colored layer, 6...Red area, 7...
... Edge area, 8... Education area. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure 2? 2

Claims (3)

[Claims] (1) The surface of a sheet coated with a substance in which a dye or pigment is dispersed in advance is brought into contact with a transparent substrate, and the sheet is heated locally from the opposite side to A method for manufacturing a color filter, characterized in that a transparent colored portion is formed by transferring the dye or pigment to a predetermined position. (2) The method for manufacturing a color filter according to claim 1, characterized in that a transparent porous layer is formed in advance on a transparent substrate. (3) The method for producing a color filter according to claim 2, wherein the refractive index of the transparent porous layer is approximately equal to the refractive index of the substance in which the dye or pigment is dispersed.