Polymer dispersed liquid crystal with surfactant for alleviating the mutual attraction between the liquid crystal and the polymer

• US 5,410,424 A
• Filed: 06/22/1994
• Issued: 04/25/1995
• Est. Priority Date: 09/21/1991
• Status: Expired due to Term

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Konuma, Toshimitsu, Hamatani, Toshiji, Yamazaki, Shunpei
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Parker, Kenneth
• Application Number:
  US08/264,247
• Time in Patent Office: 307 Days
• Field of Search: 359/51, 359/52, 359/74, 359/75, 359/76, 359/77, 359/78, 359/99, 359/103, 428/1
• US Class Current: 349/90
• CPC Class Codes: C09K 2323/05 Bonding or intermediate layer characterised by chemical composition, e.g. sealant or spacer
• CPC Class Codes: C09K 2323/053 Organic silicon compound, e.g. organosilicon
• CPC Class Codes: G02F 1/133348 Charged particles addressed liquid crystal cells, e.g. controlled by an electron beam
• CPC Class Codes: G02F 1/1334 based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals

Abstract

A liquid crystal electro-optical device which is a dispersion-type liquid crystal electro-optical device comprising an electro-optical modulating layer containing a liquid crystal material and a light-transmitting support, characterized by that there is established a force-relaxation portion for relaxing interfacial attractive force between said liquid crystal material and said light-transmitting support, and a process for fabricating the same. The force-relaxation portion can be an uncured transparent resinous material, a material obtained by decomposing the liquid crystal, a reformed surface portion, or a material selected from the group selected from lecithin, stearic acid, hexadecyltrimethylammonium bromide, octadecylmalonic acid, dibasic fatty acids, crown ethers, octadecylamine hydrochloride, and hexamethyldisilazane.

Claims

1. An electro-optical device comprising:

an electro-optical modulating layer comprising a liquid crystal and a transparent solid material therein; and

a region alleviating a mutual attraction between said liquid crystal and said transparent solid material and provided between said liquid crystal and said transparent solid material, said region comprising an uncured transparent resinous material,

wherein said modulating layer is in a light transparent state in the presence of an electric field applied thereto and in a light scattering state in the absence of an electric field.

2. The device of claim 1 wherein said liquid crystal is dispersed in said transparent solid material.

3. The device of claim 1 wherein said transparent solid material is dispersed in said electro-optical modulating layer.

4. The device of claim 1 wherein said region comprises a material for orienting a liquid crystal.

5. The device of claim 1 wherein said liquid crystal comprises a liquid crystal selected from the group consisting of nematic liquid crystal, smectic liquid crystal and cholesteric liquid crystal.

6. The device of claim 1 wherein thickness of said region is 10 to 1000 Å

.

7. An electro-optical device comprising:

an electro-optical modulating layer comprising a liquid crystal and a transparent solid material therein; and

a region alleviating a mutual attraction between said liquid crystal and said transparent solid material and provided between said liquid crystal and said transparent solid material,

wherein said region comprises an organic substance obtained by decomposing said liquid crystal.

11. The device of claim 7 wherein said liquid crystal is dispersed in said transparent solid material.

12. The device of claim 7 wherein said transparent solid material is dispersed in said electro-optical modulating layer.

8. An electro-optical device comprising:

an electro-optical modulating layer comprising a liquid crystal and a transparent solid material dispersed in said electro-optical modulating layer; and

a region alleviating a mutual attraction between said liquid crystal and said transparent solid material and provided between said liquid crystal and said transparent solid material,

wherein said region comprises a reformed surface portion of said transparent solid material.

13. The device of claim 8 wherein the transparent solid material is dispersed in the liquid crystal material.

9. An electro-optical device comprising:

an electro-optical modulating layer comprising a liquid crystal and a transparent solid material therein; and

a region provided between said liquid crystal and said transparent solid material and comprising a material selected from the group consisting of a transparent uncured resinous material, and an organic substance obtained by decomposing said liquid crystal.

10. An electro-optical device comprising:

an electro-optical modulating layer comprising a liquid crystal and a transparent solid material, said liquid crystal dispersed in said transparent solid material.

wherein a material selected from the group consisting of lecithin, stearic acid, hexadecyltrimethylammonium bromide (CTAB), octadecylmalonic acid, dibasic fatty acids, crown ethers, octadecylamine hydrochloride, and an organic silane comprising hexamethyldisilazane is separated at boundaries between said liquid crystal and said transparent solid material.

14. The device of claim 10 wherein the liquid crystal material surrounds the solid material.

15. An electro-optical device comprising:

an electro-optical modulating layer comprising a liquid crystal and a transparent solid material, said liquid crystal dispersed in said transparent solid material,

wherein a material selected from the group consisting of lecithin, hexadecyltrimethylammonium bromide (CTAB), octadecylmalonic acid, dibasic fatty acids, crown ethers, octadecylamine hydrochloride, and an organic silane comprising hexamethyldisilazane is separated at boundaries between said liquid crystal and said transparent solid material.