JPH02311823A - Orientation control film and liquid crystal element - Google Patents

Abstract

PURPOSE:To allow the control of the orientation of molecules, the assemblage thereof, etc., by using the orientation control films formed by subjecting coated films essentially consisting of serum to an orientation treatment. CONSTITUTION:A transparent electrode layer 12 consisting of indium tin oxide is formed on the substrate 11 consisting of glass, plastics, etc., and after the orientation control film 13 is formed thereon, a orientation treatment in executed, then a sealing resin 14 is printed thereon. Two sheets of such liquid crystal bases 15 are stuck to each other and after a liquid crystal 16 is injected through an aperture, the aperture is sealed to complete the liquid crystal cell. The orientation control films 13 formed by subjecting the coated films essentially consisting of the serum to the orientation treatment are used in this case. The control of the orientation of the molecules or the assemblage thereof is, therefore, possible. The orientation uniform over the entire part of the liquid crystal element is obtd. easily at a low cost when this method is applied to the liquid crystal element. Especially in the case of the liquid crystal element formed by using the liquid crystal with a ferroelectric property, the uniform orientation is easily obtd. at the low cost while bistability is perfectly maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a molecular alignment control film and a liquid crystal element.

Conventional technology As a technology for controlling the orientation of molecules and their aggregates, etc., in liquid crystal elements, synthetic polymers such as polyimide or polyamide are coated on a substrate, dried, and the surface is rubbed with a cloth to align the molecules. Orientation system with rubbing treatment for control?
Ill! is mainly used.

Further, as a method that does not perform this rubbing treatment, there is an oblique evaporation method of silicon oxide or the like. Furthermore, in nonlinear optical elements, molecular devices, and the like, methods for controlling the orientation of molecules, etc., have not been established.

Problems to be Solved by the Invention Rubbing processing, which is one of the methods for controlling the orientation of molecules, etc. in liquid crystal devices, is a simple method and can be carried out at low cost, but it is difficult to increase the area and the number of pixels. When this demand became more desirable, the conventionally used alignment control films made of polyimide and polyamide were unable to meet this demand, and the uniformity of alignment was insufficient, especially in liquid crystal devices using ferroelectric liquid crystals. Bistability is required in the orientation direction, and conventional orientation control films have had the problem of insufficiently exhibiting this bistability. On the other hand, as a method for aligning liquid crystal without performing a rubbing process, there is an oblique evaporation method. By using this method, a liquid crystal element with good performance can be manufactured, but the vapor deposition process is complicated and the cost is generally high, and it is difficult to reduce the cost particularly in a large area. Furthermore, although it is necessary to control the orientation of molecules in molecular devices, nonlinear optical devices, etc., there has been a problem in that a method for doing so has not yet been established.

Means for Solving the Problems In order to solve the above problems, the alignment control film of the present invention is obtained by subjecting a coating film containing serum as a main component to alignment treatment, and the liquid crystal element has serum applied to at least one substrate. It is equipped with an orientation control film in which the main component is a coating film that has been subjected to an orientation treatment.

Function: The present invention makes it possible to control the orientation of molecules, aggregates thereof, etc. by using an orientation control film obtained by applying an orientation treatment to a coating film containing serum as a main component. Furthermore, when this is applied to a liquid crystal device, uniform alignment can be easily achieved over the entire surface of the device at low cost. Among these, in liquid crystal elements using liquid crystals exhibiting ferroelectric properties, uniform alignment can be easily achieved at low cost while completely maintaining bistability.

EXAMPLE Hereinafter, an alignment control film according to an example of the present invention and a liquid crystal element using the same will be described with reference to the drawings. FIG. 1 is a diagram schematically showing a liquid crystal element using the alignment control film of the present invention. A transparent electrode 1i12 made of indium/tin oxide is formed on a substrate 11 such as glass or plastic, and an alignment control film 13 is formed thereon, and then an alignment treatment is performed.
A sealing resin 14 was printed, two liquid crystal supports 15 were pasted together, liquid crystal 16 was injected through the opening, and the opening was sealed to complete a so-called liquid crystal cell.

Specific Example 1 5.0 g of bovine serum was diluted with 495.0 g of pure water, and 1
．． A 0% by weight diluted bovine serum solution was prepared. Next, this diluted solution was spin-coated for 1 minute at 2000 revolutions/minute onto a glass substrate on which an ITO electrode pattern was formed. After coating, it was dried in an electric furnace at 100°C for 1 hour. After drying, the surface on which the bovine serum coating was formed was rubbed five times in the same direction using a rayon cloth to complete an orientation control film. Two glass liquid crystal support plates having bovine serum alignment control films formed thereon are prepared, and as shown in FIG. As a spacer/sealing resin 25, the diameter is 7.
Acid anhydride-curing epoxy resin with μm glass fibers dispersed in it leaves a 5a width in the center of one side and 0mm around the other edges.
．． After printing with a width of 2aii, the alignment system is formed on the upper liquid crystal support plate 21 and the lower liquid crystal support plate 22. The rubbing directions 23 and 24 of the No. 11 films were perpendicular to each other, and the surfaces of the alignment control films were pressed against each other and heated at 150° C. for 5 hours to cure and bond. After adhesion, liquid crystal 26 (product name: Z L 13225, manufactured by Merck & Co., Ltd.) was injected from the opening under reduced pressure. After injection, the opening was sealed with a commercially available acid anhydride-curing epoxy resin to complete a so-called twisted manetic (TN) type liquid crystal cell. The thus completed TN type liquid crystal cell showed a good alignment state with no alignment unevenness, and good electro-optical properties were obtained.

Specific Example 2 5.0 g of bovine serum was diluted with 495.0 g of pure water, and 1
．． A 0% by weight diluted bovine serum solution was prepared. Next, this diluted solution was spin-coated for 1 minute at 2000 rpm on a glass liquid crystal support plate on which an ITO electrode pattern was formed. After coating, it was dried in an electric furnace at 100°C for 1 hour.

After drying, the surface on which the bovine serum coating was formed was rubbed five times in the same direction using a rayon cloth to complete an orientation control film. Two glass liquid crystal support plates having bovine serum alignment control films formed thereon are prepared, and as shown in FIG. As a spacer/sealing resin 35, an acid anhydride-curing epoxy resin in which glass fibers with a diameter of 2 μm are dispersed is printed with a width of 0.2 m on the entire periphery, leaving a width of 5III1 in the center of only one side. The rubbing directions 33 and 34 of the alignment control films formed on the upper liquid crystal support plate 31 and the lower liquid crystal support plate 32 are parallel to each other, and the surfaces of the alignment control films are placed under pressure and heated at 150° C. for 5 hours. and cured and glued. After adhesion, liquid crystal 36 (product name: Z L 13654, manufactured by Merck & Co., Ltd.) was injected from the opening under reduced pressure. After injection, the opening was sealed with a commercially available acid anhydride-curing epoxy resin. Furthermore, the encapsulated liquid crystal was heated to a temperature at which it exhibits an isotonic phase, that is, around 80°C, and the temperature was gradually lowered to complete a so-called ferroelectric liquid crystal cell. The ferroelectric liquid crystal cell thus completed exhibited a good alignment state with no alignment unevenness, and upon application of a voltage, good electro-optical properties with ensured bistability were obtained.

Specific Example 3 5.0 g of human serum was diluted with 495.0 g of pure water, and 1.
A 0% by weight human serum dilution solution was prepared. Using this diluted solution, a TN type liquid crystal cell was fabricated by the method shown in the specific examples. The completed TN type liquid crystal cell showed a good alignment state with no alignment unevenness, and good electro-optical properties were obtained.

Specific Example 4 Dilute 5.0 g of human serum with 495.0 g of pure water,
A 1.0% by weight human serum dilution solution was prepared. A ferroelectric liquid crystal cell was produced using this diluted solution by the method shown in Example 2. The completed ferroelectric liquid crystal cell showed a good alignment state with no alignment unevenness, and when voltage was applied, good electro-optical properties with ensured bistability were obtained.

Specific Example 5 5.0g of horse serum was diluted with 495.0g of pure water, and 1.
A 0% by weight horse serum dilution solution was prepared. Using this diluted solution, a TN type liquid crystal cell was manufactured by the method shown in Example 1. The completed TN type liquid crystal cell exhibited a good alignment state with no alignment unevenness, and good electro-optical properties were obtained.

Specific Example 6 5.0 g of horse serum was diluted with 495.0 g of pure water,
A 1.0% by weight horse serum dilution solution was prepared. A ferroelectric liquid crystal cell was produced using this diluted solution by the method shown in Example 2. The completed ferroelectric liquid crystal cell showed a good alignment state with no alignment unevenness, and good electro-optical properties with bistability ensured by voltage application were obtained.

In this example, the spin coating method was used as the method for forming the coating film, but the dip coating method, the printing method, etc. are applicable to any coating method. In addition, the liquid crystal used for injection (manufactured by Merck, product name ZL13225, ZL 136)
54) is not limited to this.

Effects of the Invention As described above, the present invention makes it possible to control the orientation of molecules, aggregates thereof, etc. by using an orientation control film obtained by subjecting a coating film containing serum as a main component to an orientation treatment. Furthermore, when this is applied to a liquid crystal device, uniform alignment can be easily achieved over the entire surface of the device at low cost. Among these, liquid crystal elements using liquid crystals exhibiting ferroelectricity can easily achieve uniform alignment at low cost while maintaining complete bistability.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a liquid crystal device of the present invention, FIG. 2 is an explanatory diagram showing a TN type liquid crystal device using the alignment control film and alignment control method of the present invention, and FIG. 3 is a schematic diagram of the alignment control film of the present invention and FIG. 2 is an explanatory diagram showing a ferroelectric liquid crystal element using an alignment control method. 11...Substrate, 12...Transparent electrode layer,
13...Alignment control film, 14...Spacer/sealing resin, 15...Liquid crystal support plate, 16.
...Liquid crystal, 21.31...Upper liquid crystal support plate, 22, 32...Lower liquid crystal support plate, 23.3
3...Rubbing direction of upper liquid crystal support plate, 2
4.34...Rubbing direction of lower liquid crystal support plate, 25.35...Spacer/sealing resin. Name of agent: Patent attorney Shigetaka Awano, 1 person, 11-m-
Substrate 12--transition reading layer 13--orientation side 14°-scope and seal 2nd rllJzs 31--yo 11 Toshin support class 3z--lower/1f1 sacrilege Plate 3S - How to process the laching on the support plate for the I-I product support plate '1 Town 34- How to process the Rabink on the support plate for the I-I products from the Inu II - Sbave and seal stamping Fig. 3 72-1111

Claims (3)

[Claims] (1) An orientation control film, which is a coating film containing serum as a main component, and is characterized in that the coating film has been subjected to an orientation treatment. (2) A liquid crystal substance is held in the space between a pair of liquid crystal support plates facing each other, each of which has an alignment control film formed by applying an alignment treatment to a coating film containing serum as a main component on at least one of the substrates. liquid crystal element. (3) The liquid crystal element according to claim (2), wherein the liquid crystal material held in the space between the liquid crystal support plates exhibits ferroelectricity.