JPH0659111A - Color filter and liquid crystal display device - Google Patents

Abstract

PURPOSE:To provide the liquid crystal display device on which load, such as physical force, is not applied and which obviates mixing of color filters with each other and generation of color slurring by incorporating a resin which is cured by light or heat into the color filters for the liquid crystal display device, thereby forming the color filters. CONSTITUTION:The resin 6 which is cured by light or heat is incorporated in addition to dyes or pigments 5 into the color filter 8. The curing resin 6 which is in the non-polymer state of the monomers of the resin or is polymerized to the extent of being easily applied on the color filter 8 is formed on a substrate 1 at the time of forming the color filter 8 on the glass substrate 1. The monomer or polymer is then polymerized and cured by the light or heat. A protective film 7 consisting of an insulating film, etc., is then formed on the color filter 8 and a display electrode consisting of ITO, etc., is formed on this protective film 7, by which the physical force to be applied on the color filter 8 by the rubbing treatment to orient the liquid crystal is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter containing a resin which is cured by light or heat or a protective film for a filter, and a liquid crystal display device having the same.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional liquid crystal display device. In a conventional liquid crystal display device, liquid crystal is enclosed via a spacer 4 in a pair of glass substrates 1 to which a polarizing plate 2 is attached, and a transparent electrode 3 provided inside these glass substrates.
By applying a voltage to the liquid crystal, the display is performed by the difference in the polarization axes of the light passing through the liquid crystal and the light polarized by the polarizing plate.

A color filter corresponding to the display electrodes was provided on one of the glass substrates.

[0004]

However, since the color filter of the conventional liquid crystal display device is made of a very soft substance, that is, a pigment or a dye, a display electrode such as ITO is formed on the color filter or a liquid crystal display. Due to the rubbing treatment for aligning the orientations, a physical force is added to the color filters, and the color filters are mixed with each other, causing a problem such as a color shift.

[0005]

In a color filter used for a liquid crystal display device, the color filter contains a resin which is cured by light or heat.

[0006]

FIG. 2 is a diagram schematically showing a color filter for one pixel used in the liquid crystal display device of the present invention. In addition to the pigment or dye 5, this color filter contains a resin 6 that is cured by light or heat. Examples of the curable resin include thermosetting resins such as polydiethylene glycol bisallyl carbonate, and ultraviolet curable resins such as polyethylene glycol di (meth) acrylate and polypropylene glycol di (meth) acrylate which are di (meth) acrylate monomers.

The color filter 8 of FIG. 2 contains a mixture of these curable resins and pigments or dyes. When a color filter made of this mixture is formed on a substrate made of glass or film, the curable resin is A state where the monomers are not polymerized or a polymer which is polymerized to the extent that the color filter is easily coated is formed on the substrate.

After forming this color filter, the monomer or polymer is polymerized by light or heat to cure the color filter, or after forming a protective film such as an insulating film on the color filter, the monomer or polymer is irradiated by light or heat. After the color filter is polymerized to cure or a protective film such as an insulating film is formed on the color filter, a display electrode made of ITO or the like is formed on this protective film, and a monomer or polymer is polymerized by light or heat to color the color. There is a method of hardening the filter, but either method may be used.

3 to 5, after the color filter is formed, the color filter is cured, a protective film such as an insulating film is formed on the color filter, and a display electrode made of ITO or the like is formed on the protective film. It is a figure which shows the manufacturing method of the liquid crystal display device of this application.

First, as shown in FIG. 3, a color filter 9 is formed on the substrate 1. A film such as SiO ₂ may be provided as a base under the color filter.

As shown in FIG. 2, the color filter 9 contains a pigment 6 or a dye 5 and a resin 6 which is cured by light or heat. Examples of the curable resin include thermosetting resins such as polydiethylene glycol bisallyl carbonate, and ultraviolet curable resins such as polyethylene glycol di (meth) acrylate and polypropylene glycol di (meth) acrylate which are di (meth) acrylate monomers.

In the case of a color filter containing a photo-curing resin, the curing method is curing with ultraviolet rays or other light 10.
When using a color filter containing a thermosetting resin, heat 1
Hardens with 0. In this way, the color filter is cured by heat or light to increase the strength of the color filter.

Next, as shown in FIG. 4, after forming a protective film 11 such as an insulating film on the color filter, a display electrode 12 made of ITO or the like is formed on the protective film 11.

FIG. 5 is a view in which the one substrate thus formed is overlaid with the other substrate 13 via a spacer. When forming active elements such as TFTs and MIMs on the side of the other substrate 13 shown in FIG. 5, a glass substrate is used due to the problem of process temperature, and the glass substrate and the substrate 1 on which color filters and display electrodes are formed are bonded together. After that, the liquid crystal 14 is enclosed in the space sandwiched between the upper and lower sides, and the liquid crystal display device of the present application can be made.

[0015]

Since the color filter is hardened, physical force is applied to the color filter by forming a display electrode such as ITO on the color filter or by rubbing for aligning the liquid crystal. Since no addition is required and the color filters do not mix with each other, there is no problem such as occurrence of color shift.

[Brief description of drawings]

FIG. 1 is a diagram showing a conventional liquid crystal display device.

FIG. 2 is a diagram schematically showing a color filter for one pixel used in the liquid crystal display device of the present invention.

FIG. 3 is a diagram showing a method for manufacturing the liquid crystal display device of the present application.

FIG. 4 is a diagram showing a manufacturing method of the liquid crystal display device of the present application.

FIG. 5 is a diagram showing a method of manufacturing the liquid crystal display device of the present application.

[Explanation of symbols]

 1 ... Glass substrate 2 ... Polarizing plate 3 ... Electrode 4 ... Spacer 5 ... Dye or pigment 6 ... Curing resin by light or heat 7 ... Protective film 8 ... Display Color filter for one pixel corresponding to electrodes 9 ... Color filter 10 ... Ultraviolet light, heat 11 ... Display electrode 12 ... Counter electrode 13 ... Liquid crystal such as TN, STN, PDLC

Claims (6)

[Claims] 1. A color filter used in a liquid crystal display device, wherein the color filter contains a resin that is cured by light or heat. 2. The color filter according to claim 1, wherein the photocurable substance is an ultraviolet curable resin. 3. The color filter according to claim 1, wherein the color filter contains a pigment or a dye. 4. A liquid crystal display device in which a liquid crystal is sandwiched between a pair of substrates, a transparent substrate, a color filter containing a resin that is cured by light or heat formed on the substrate, and a color filter formed on the color filter. A liquid crystal display device comprising: a formed insulating film; and a display electrode formed on the insulating film. 5. A liquid crystal display device in which liquid crystal is sandwiched between a pair of substrates, a transparent substrate, a color filter formed on the substrate, and a resin formed on the color filter and cured by light or heat. A liquid crystal display device, comprising: an insulating film containing the film; and a display electrode formed on the insulating film. 6. The color filter according to claim 4, wherein the transparent substrate is glass or a flexible film substrate.