JPH03209222A - Ferroelectric liquid crystal element and production of the same - Google Patents

Abstract

PURPOSE:To obtain uniform orientation with small orientation nonuniformity over the whole surface of an element easily at low cost by executing an orientation processing to a liquid crystal support board by rubbing in advance and setting the film thickness of an orientation control film less than a specified value. CONSTITUTION:As a liquid crystal support board 15, a substrate 11 is used while receiving the orientation processing in advance and onto the substrate 11, the polyimid with thickness 200Angstrom is applied as the orientation control film 13. Since the substrate 11 receiving the orientation processing by rubbing in advance is used for the liquid crystal support board and an orientation control film 13 is applied onto the substrate, difference in the strength of rubbing is reduced in the liquid crystal picture element without executing the orientation processing to the orientation control film 13. Thus, the uniform orientation over the whole surface of the element is easily obtained at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a ferroelectric liquid crystal device and a method for manufacturing the same.

Conventional technology As a technology for controlling the orientation of molecules and their aggregates, etc., in liquid crystal elements, a polymer such as polyimide or polyamide is applied to a substrate, dried, and the surface is rubbed with a cloth to align it. Orientation controlled by rubbing treatment to control
Membranes are mainly used. Additionally, as a method that does not involve this rubbing process, there is an oblique evaporation method of silicon oxide, etc. 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 it becomes desirable to use the conventional orientation system? In the liquid crystal device fabrication method in which the coating film is rubbed after IM coating, unevenness in the film thickness during the coating of the alignment control film causes insufficient alignment uniformity due to subtle differences in the subsequent rubbing conditions. , in a liquid crystal element using a liquid crystal exhibiting ferroelectricity,
Bistability is required in the orientation direction of the molecules, but the expression of bistability in the non-uniform alignment region is insufficient, making it difficult to achieve bistability over the entire surface of the liquid crystal cell. Ta. ! Means for Solving IB In order to solve the above-mentioned LI problem, the method for manufacturing a ferroelectric liquid crystal element of the present invention uses a substrate that has been subjected to an alignment treatment as a liquid crystal support plate, and has an alignment control layer on the substrate. By forming a polyimide coating film containing 1!7 to 200, it is possible to orient molecules and their aggregates without applying orientation treatment to the orientation control film. This is a method for manufacturing a dielectric liquid crystal element.

Function The present invention uses a substrate that has been subjected to alignment treatment by rough rubbing as a substrate used as a liquid crystal support plate, and by coating an alignment control film on the substrate, a liquid crystal element can be formed without performing alignment treatment on the alignment control film. It is possible to reduce the difference in the strength of rubbing within the G
This can be achieved at low cost. Even in width, liquid crystal devices using liquid crystals that exhibit ferroelectric properties can achieve uniform alignment at low cost while maintaining complete bistability. EXAMPLE Hereinafter, an alignment control film according to an example of the present invention and a liquid crystal device using the same will be described with reference to the drawings. 1st
The figure shows the orientation system of the present invention? 21 is a diagram schematically showing a liquid crystal element using a 21 film. A transparent electrode 12 made of indium/tin oxide is formed on a substrate 11 made of glass, plastic, etc.
After forming an alignment control film 13 thereon, an alignment treatment is performed, a smoother and gel resin l4 is printed, and two liquid crystal support plates l5 are formed.
After pasting together the liquid crystal 16 and injecting liquid crystal 16 through the opening, the opening was sealed and a so-called ferroelectric liquid crystal cell was completed. In order to improve the bistability of the ferroelectric liquid crystal cell that had become so successful, stearylamine was added to the ferroelectric liquid crystal to be injected. Triphenylamine, cyclohexylamine, diphenylamine, methyldiphenylamine. Penzylamine, methylbenzylamine, dimethylbenzylamine, phenylethylamine, phenylethylamine. Penzylethanolamine. Phenyldiethanolamine, 1.1'(phenylimino)di-2-probanol, diphenyl. One or a mixture of several of diviridyl and polyoxypropylene polyamine amines may be added as an additive.

Example I The surface of a glass substrate on which a JTO'i electrode pattern was formed was rubbed 10 times in the same direction using a rayon cloth. The glass substrate that has been subjected to the rubbing treatment is
Commercially available polyimide (RN715 manufactured by Nissan Chemical Co., Ltd.) 0.3 g
A 0.3% polyimide solution diluted with 99.7 g of thinner was applied by rotation at 2500 rpm for 1 minute. After coating, the solvent was evaporated at 80°C for 15 minutes, and then dried at 250°C. The film thickness is 60 people. Two glass liquid crystal support plates on which polyimide alignment control films have been formed are prepared, and as shown in FIG. Diameter 2 as cum seal tree Bri25
After printing acid anhydride-curing epoxy resin in which glass fibers of μm are dispersed, a width of 5III1 is left in the center of the I side, and a width of 0.2 am is printed on the other periphery, and then printed on the upper liquid crystal support plate 2.
1 and the rubbing directions 23 and 24 of the orientation control jBH formed on the lower support plate 22 were parallel to each other, and the orientation control film surfaces were placed opposite each other, and pressure was applied, and the film was heated at 140° C. for 4 hours to cure and bond. After bonding, the temperature at which the liquid crystal exhibits isotropy is 80°C.
It was heated to around °C, and liquid crystal (manufactured by Merck & Co., trade name: ZLI3654) was injected through the opening.

After injection, it was slowly cooled to room temperature, and the opening was sealed with a commercially available acid anhydride-curing epoxy resin L2, completing a ferroelectric liquid crystal cell. The ferroelectric liquid crystal cell that has been perfected in this way exhibits a good alignment state with little alignment unevenness and rubbing unevenness,
By applying a voltage, good electro-optical properties with ensured bistability were obtained.

Example 2 Glass substrate with ITO electrode pattern formed
- 3 ・1)・Anzu・] ・Same・H direction Z, this
Oenra・゛・、1・V 8 4'i'−,'l
1 fko, f J) t=- ”,/g.1 desiredIt: i'?
, tfj coffee's Boliimi i"< i-l made by Sankagakusha f
jN7 15) ti. 5g-Q. J9.5g・tsu7nopu'- in Arizawa. /'J. 5% by weight Boliimi I/Solution and 2
: i o o Rotation/coating for 1 minute at the same speed as jT. After coating, the solvent was evaporated at 80'C for 5 minutes, and then dried at 250'C. Film thickness is 12
0 people 'y'L'FZ It was made by the same operation as Example 1, 61 strong 1i, ¥5 information.冫τ・．・0. It shows a good orientation state, and voltage mark 1 + old voltage:;l:<e
, / Good electro-optical properties with ensured properties are obtained -y tL
y). ．． , Faulty example, be fruit 8i! ! A liquid crystal cell with strong creeping property ε produced by the same procedure as in Example ia is a liquid crystal to which 0.3% of Henzil 7min was added as a cooling agent (trade name: Z t. + 3654, manufactured by Merck & Co., Ltd.).
) was injected. The ferroelectric liquid crystal cell that has been perfected in this way shows a good alignment state with little alignment unevenness and rubbing unevenness, and when a voltage is applied, it exhibits good electrophotonic properties with bistability and 61') 6W maintained. ．． A saw is obtained, ,k・−
Love,,: Shuangan, f, (j',.τ゛・
<'・Rokyasaku'・4,..., fruit. ! Example 15} Manufactured by the same procedure as in Example 1 {7〆; Stearyl was added as an additive to a silk liquid crystal cell. I″a/o.j filling% liquid crystal (product name: Merck & Co., Ltd. Z L I s65
4) was injected. The ferroelectric liquid crystal cell that has been perfected in this way exhibits a good alignment state with little alignment unevenness and rubbing defects, and when a voltage is applied, bistability is ensured and good electro-optical properties are obtained. 7 Example 5 Produced by the same procedure as Example 1: '. -'7! 400'"l as an additive for dielectric liquid crystal cells
．． 4': Added 0.1% by weight of isopropylene diamine
Inject iO L late crystal (trade name: ZL [3654, manufactured by Merck & Co., Ltd.).

The ferroelectric liquid crystal cell that has been perfected in this way shows a good alignment state with little alignment unevenness and rubbing unevenness, and when voltage is applied, good electro-optical properties with guaranteed bistability can be obtained, and it can be used for a long time. Trap #1 Bistability was ensured. 'e Cicada Example S Length 5.8 Produced by the same operation as in Example 1. A liquid crystal (product name: ZLI3654, manufactured by Merck & Co., Ltd.) containing 0.3% by weight of Polyoxylinamine 230 was injected.

The ferroelectric liquid crystal cell completed in this way exhibits a good alignment state with little alignment unevenness and rubbing unevenness, and when voltage is applied, good electro-optical properties with ensured bistability can be obtained, and furthermore, it can remain stable for a long period of time. Stability was ensured.

Comparative Example I The surface of the glass IKW on which the turns of the ITO electrode had been formed was subjected to hinoki treatment (i1N) in which the surface was turned 10 times in the same direction using a rayonite cloth. Commercially available polyimide (RN715 manufactured by Nissan Chemical Co., Ltd.) was applied to the glass substrate that had been subjected to the rubbing treatment.
A 1.5% by weight polyimide solution prepared by diluting 1.5g with 98.5g of coating material was spin-coated and the coating film was dried under the same conditions as in Example 1. 11! There were 300 people. After drying, a ferroelectric liquid crystal cell was prepared using the same procedure as in Example 1. In this way, the ferroelectric liquid was perfected! =． The orientation of lL· indicates a twisted orientation state L7,
Bistability could not be achieved even by applying voltage. Comparative Example 2 Into a ferroelectric liquid crystal cell prepared in the same manner as in Example 1, a liquid crystal (product name: Z L I 36543 manufactured by Merck & Co., Ltd., manufactured by Merck & Co., Ltd.) containing 70.5% by weight of benzyl ua as an additive was injected. The resulting ferroelectric liquid crystal cell had alignment disorder, and uniform alignment could not be obtained. Comparative Example 3 A ferroelectric liquid crystal cell was prepared in the same manner as in Example 1, and stearino! was added as an additive to the ferroelectric liquid crystal cell. 7'5 70.
Liquid crystal containing 5% by weight (product name: ZLT manufactured by Merck & Co., Ltd.)
3654) was injected. The ferroelectric liquid crystal cell that was successfully used in this way suffered from alignment disturbances and was unable to achieve uniform alignment. Comparative Example 4 A liquid crystal containing 0.5% by weight of polyoxypropylene diamine having a molecular weight of 400 as an additive (product name: ZLI3654, manufactured by Merck & Co., Ltd.) was injected into a ferroelectric liquid crystal cell prepared in the same manner as in Example 1. In the ferroelectric liquid crystal cell completed in this way, alignment disorder occurred and uniform alignment could not be obtained. Comparison N5 A liquid crystal containing 0.5% by weight of boroxypropylene diamine having a molecular weight of 230 as an additive (trade name ZLI3654, manufactured by Merck & Co., Ltd.) was injected into a ferroelectric liquid crystal cell prepared in the same manner as in Example 1.

In the ferroelectric liquid crystal cell completed in this way, alignment disorder occurred and uniform alignment could not be obtained. In the above examples, the surface of the transparent electrode was directly rubbed, but the present invention can also be applied to the case where the surface of silicon oxide or the like, which is formed to prevent shortening, is rubbed on the transparent electrode. Effects of the Invention As described above, the present invention provides alignment processing by rubbing in advance on a liquid crystal support plate used in a liquid crystal element, and thereby provides alignment controlled rBW.
Orientation control by reducing the film thickness of I to 200 or less? ill
It becomes possible to control the orientation of molecules and their aggregates without applying orientation treatment to l51. Furthermore, when applied to liquid crystal devices, uniform alignment with little alignment unevenness can be easily achieved over the entire surface of the device at low cost.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a liquid crystal device of the present invention, and FIG. 2 is a schematic diagram of a ferroelectric liquid crystal device using the orientation control 1fIB and orientation control method of the present invention. 11...Substrate, 12...Transparent electrode layer,
l3...Alignment control film, l4...Substrate and sealing resin, 15...Liquid crystal support plate, l6.
...Liquid crystal, 21... Upper liquid crystal support plate, 2
2...Lower liquid crystal support plate, 23...Rubbing direction of upper liquid crystal support plate, 24...Rubbing direction of lower liquid crystal support plate, 25... ...Spacer and seal resin.

Claims (4)

[Claims] (1) Ferroelectricity characterized in that at least one of the substrates having at least a transparent electrode has an oriented surface, and a polyimide film with a thickness of 200 Å or less is formed on the oriented substrate surface. liquid crystal element. (2) The ferroelectric liquid crystal element according to claim (1), wherein the liquid crystal substance held in the opposing interval between the liquid crystal support plates is a pyrimidine liquid crystal and exhibits ferroelectricity. (3) The ferroelectric liquid crystal element according to claim (2), wherein the liquid crystal substance contains an amine compound as an additive. (4) Ferroelectricity characterized by comprising the steps of: performing an alignment treatment on the surface of at least one substrate having at least a transparent electrode; and forming a polyimide film with a thickness of 200 Å or less on the orientation-treated surface. Manufacturing method for liquid crystal elements.