JPH04179918A - Production of color liquid crystal display device - Google Patents

Abstract

PURPOSE:To allow the simultaneous formation of a polymer dispersion type liquid crystal body and color filters by coprecipitating polymer precursors, microcapsulate liquid crystals and org. dyestuffs insoluble in water on an electrode substrate, then sticking the electrode substrate to a transparent substrate with transparent electrodes. CONSTITUTION:An ITO (Indium Tin Oxide) film 1 is formed by sputtering on the glass substrate 2 and is made into the transparent electrodes. The microcapsulated liquid crystals and the org. dyestuff insoluble in water are dispersed into a polymer precursor soln. which can electrochemically precipitate on electrodes and thereafter, an electrolysis is effected in the soln., by which the eutectoid bodies 3 to 5 of the polymer precursors, the microcapsulated liquid crystals and the org. dyestuffs insoluble in water are obtd. on the electrode substrate 2 and thereafter, this electrode substrate 2 is stuck to the transparent substrate 7 with the transparent electrodes. The color polymer dispersion type liquid crystal display body is formed easily in terms of production techniques.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a color liquid crystal display device that can be used as a flat display.

[Conventional technology]

In recent years, polymer-dispersed liquid crystals have been attracting attention as a new liquid crystal display device.

Polymer-dispersed liquid crystals are produced by dispersing liquid crystals in a polymer precursor dissolved in a solvent, then solidifying the polymer by evaporating the solvent or using a combination of heating and ultraviolet irradiation. This method produces spherical liquid crystal capsules with a diameter of about 10 μm, and by sandwiching this polymer body between electrode substrates and applying a voltage, it can be used as an optical display device.

Unlike conventional liquid crystal display devices, this polymer-dispersed liquid crystal does not require a polarizing plate, so it has the advantage of ensuring high brightness.

However, in order to perform multicolor display by coloring, it was necessary to separately attach a color filter substrate as in the past.

[Problem to be solved by the invention]

As described above, in the conventional technology, in order to make a polymer-dispersed liquid crystal multicolor, it was necessary to separately prepare a color filter substrate with a predetermined color pattern and laminate it on the polymer-dispersed liquid crystal.

The present invention differs from conventional methods in that it provides a method that can simultaneously form a polymer-dispersed liquid crystal and a color filter.

[Means to solve the problem]

The method for manufacturing a color liquid crystal display device of the present invention involves dispersing microencapsulated liquid crystal and water-insoluble nail machine dye in a polymer precursor solution that can be electrochemically deposited on electrodes. The method is characterized in that a polymer precursor, a microencapsulated liquid crystal, and a water-insoluble organic dye are co-deposited on an electrode substrate by electrolysis in a solution, and then the electrode substrate is bonded to a transparent substrate with a transparent electrode. shall be.

Furthermore, R, G, and B primary color pigments are used as water-insoluble organic pigments, and by creating an electrolytic solution containing them, R, G, and H patterns can be formed on the same substrate. It is characterized by enabling a multi-color liquid crystal display device.

In this technology, the eutectoid film of a polymer precursor, microencapsulated liquid crystal, and water-insoluble organic dye is produced when an ionic polymer precursor is electrochemically deposited on an electrode. It is thought that it can be created by simultaneously incorporating microencapsulated liquid crystal and organic dye particles.

〔Example〕

I was sputtered onto a glass substrate with a diagonal of 6 inches.
A T 2 O (Indium Tin Oxide) film was formed to a thickness of 1000 Å to form a transparent electrode.

Furthermore, using the photolithography method, ITO was coated with a width of 0.
A striped pattern consisting of 321 lines was formed in the order of 2+*m and an inter-pattern pitch of 0.25, and this was used as a substrate for electrolysis.

Subsequently, 11 each of three types of electrolytic solutions having the following compositions were created. Both electrolytes are based on aqueous solutions containing electrochemically precipitable acrylic acid and melamine resin, as well as some butyl cellosolve.

After dissolving it in a drug and making it into a mist, it was coated with gelatin to form microcapsules.

The diameter was approximately 3-5 μm. Organic pigments were used as water-soluble organic dyes.

The microencapsulated liquid crystal and organic pigment described above were dispersed in the base polymer precursor solution using ultrasonic dispersion.

Next, electrolysis was performed using the glass substrate described above.

First, electricity was selectively applied to every third ITO pattern on the substrate, and electrolysis was performed using electrolyte solution 1.

20V was applied between the electrode and the counter electrode, and electrolysis was performed for 3 minutes.

As a result, a eutectoid film consisting of polymer, microencapsulated liquid crystal, and red organic pigment was formed on ITO with a film thickness of about 15 μm. FIG. 1(a) schematically shows the cross section.

Next, electrolyte 2 was used to create an ITO pattern different from the above-mentioned ITO pattern.
The TO pattern was also selectively energized every three lines, and by the same operation, a eutectoid film consisting of polymer, microencapsulated liquid crystal, and green organic pigment was produced with a film thickness of about 15 μm. FIG. 1(b) schematically shows the cross section.

Further, the remaining ITO pattern was energized using electrolytic solution 3, and a eutectoid film with a thickness of about 15 μm consisting of polymer, microencapsulated liquid crystal, and blue organic pigment was formed. FIG. 1(C) schematically shows the cross section.

By the above operations, R
We were able to create a polymer-dispersed liquid crystal consisting of a striped pattern of the primary colors , G, and H.

Next, a glass substrate on which an ITO pattern is formed in a stripe pattern perpendicular to the ITO pattern on the substrate is bonded to the substrate on which the polymer-dispersed liquid crystal is formed by applying a thermosetting resin. By performing prescribed heating, the color liquid crystal display device of the present invention could be produced.

It was confirmed that this color liquid crystal display device operated as a color liquid crystal display by applying a voltage of about 50 V between the side substrates.

〔Effect of the invention〕

As described above, according to the present invention, it has become possible to easily create a color polymer dispersed liquid crystal display in terms of production technology. It is expected that the manufacturing cost will be low, and mass productivity will be high.

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing an example of a method for manufacturing a color liquid crystal display device of the present invention. 1...ITO 2...Glass substrate 3...Eutectoid of polymer, microencapsulated liquid crystal and organic pigment (red) 4...Polymer, microencapsulated liquid crystal and organic pigment (green) Eutectoid 5: Eutectoid of polymer, microencapsulated liquid crystal, and organic pigment (blue) 6: ITO 7: Glass substrate 8: Thermosetting resin Applicant: Seiko Epson Corporation

Claims (1)

[Claims] 1) After dispersing a microencapsulated liquid crystal and a water-insoluble organic dye in a polymer precursor solution that can be electrochemically deposited on an electrode, electrolysis is carried out in the solution. A color liquid crystal display characterized in that a polymer precursor, a microencapsulated liquid crystal, and a water-insoluble organic dye are co-deposited on an electrode substrate by performing the above steps, and then the electrode substrate is bonded to a transparent electrode with a transparent electrode. Method of manufacturing the device. 2) In claim 1, R as the water-insoluble organic dye
2. The method of manufacturing a color liquid crystal display device according to claim 1, wherein patterns of the three primary colors R, G, and B are formed on the same substrate using the three primary colors R, G, and B.