Method for manufacturing liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9239497-B2
Application number	US-78579710-A
Country	US
Kind code	B2
Filing date	May 24, 2010
Priority date	May 29, 2009
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

It is an object to provide a method for manufacturing a liquid crystal display device including a liquid crystal layer which exhibits a stable blue phase. The following steps are performed: a first step of forming a thermosetting first sealant so as to form a frame over a first substrate; a second step of forming a photocurable and thermosetting second sealant on an outer side than the first sealant over the first substrate; a third step of dropping a liquid crystal material which exhibits a blue phase at a given temperature on an inner side than the first sealant; a fourth step of attaching a second substrate to the first substrate in a reduced-pressure atmosphere; a fifth step of performing polymer stabilization treatment on the liquid crystal material; and a sixth step of curing the first sealant through heat treatment.

First claim

What is claimed is:

1. A method for manufacturing a liquid crystal display device, comprising the steps of:
forming a first sealant so as to form a frame over a first substrate;
forming a second sealant so as to form a frame over a second substrate;
after forming the first sealant, pre-curing the first sealant through a first heat treatment;
after pre-curing the first sealant, dropping a liquid crystal material on an inner side of the first sealant;
after dropping the liquid crystal material, attaching the second substrate to the first substrate in a reduced-pressure atmosphere with the first sealant, the second sealant and the liquid crystal material interposed therebetween so that the second sealant is outside of and apart from the first sealant, wherein the liquid crystal material is not in contact with the first sealant;
performing polymer stabilization treatment including a second heat treatment on the liquid crystal material interposed between the first substrate and the second substrate, wherein viscosity of each of the liquid crystal material and the second sealant is reduced by the second heat treatment, whereby the liquid crystal material spreads to be in contact with the first sealant and a width of the second sealant is increased, and wherein the polymer stabilization treatment is performed before the second sealant is pre-cured;
curing the first sealant through a third heat treatment; and
cutting the first substrate and the second substrate between the first sealant and the second sealant,
wherein the first sealant is a thermosetting sealant, and
wherein the second sealant is a photocurable and thermosetting sealant.

2. The method for manufacturing a liquid crystal display device according to claim 1 , wherein as the liquid crystal material, a material which exhibits a blue phase at a given temperature is used.

3. The method for manufacturing a liquid crystal display device according to claim 1 , wherein the polymer stabilization treatment is performed in such a manner that the second heat treatment is performed so that a temperature of the liquid crystal material is set to a temperature at which the liquid crystal material exhibits a blue phase, and then the liquid crystal material is irradiated with ultraviolet rays.

4. The method for manufacturing a liquid crystal display device according to claim 1 , wherein the polymer stabilization treatment is performed in such a manner that the second heat treatment is performed so that a temperature of the liquid crystal material is set to a temperature within +5° C. of a phase transition temperature between a blue phase and an isotropic phase, at which the liquid crystal material exhibits an isotropic phase, and then the liquid crystal material is irradiated with ultraviolet rays.

5. The method for manufacturing a liquid crystal display device according to claim 1 , wherein the liquid crystal material includes a photocurable resin.

6. A method for manufacturing a liquid crystal display device, comprising the steps of:
forming a first sealant so as to form a frame over a first substrate;
forming a second sealant so as to form a frame over a second substrate;
after forming the first sealant, pre-curing the first sealant through a first heat treatment;
after pre-curing the first sealant, dropping a liquid crystal material on an inner side of the first sealant;
after dropping the liquid crystal material, attaching the second substrate to the first substrate in a reduced-pressure atmosphere with the first sealant, the second sealant and the liquid crystal material interposed therebetween so that the second sealant is outside of and apart from the first sealant, wherein the liquid crystal material is not in contact with the first sealant;
after attaching the second substrate to the first substrate, curing the first sealant through a second heat treatment, wherein viscosity of each of the liquid crystal material and the second sealant is reduced by the second heat treatment, whereby the liquid crystal material spreads to be in contact with the first sealant and a width of the second sealant is increased;
after curing the first sealant through the second heat treatment, performing polymer stabilization treatment on the liquid crystal material interposed between the first substrate and the second substrate, wherein the polymer stabilization treatment is performed before the second sealant is pre-cured; and
cutting the first substrate and the second substrate between the first sealant and the second sealant,
wherein the first sealant is a thermosetting sealant, and
wherein the second sealant is a photocurable and thermosetting sealant.

7. The method for manufacturing a liquid crystal display device according to claim 6 , wherein as the liquid crystal material, a material which exhibits a blue phase at a given temperature is used.

8. The method for manufacturing a liquid crystal display device according to claim 6 , wherein the polymer stabilization treatment is performed in such a manner that a third heat treatment is performed so that a temperature of the liquid crystal material is set to a temperature at which the liquid crystal material exhibits a blue phase, and then the liquid crystal material is irradiated with ultraviolet rays.

9. The method for manufacturing a liquid crystal display device according to claim 6 , wherein the polymer stabilization treatment is performed in such a manner that a third heat treatment is performed so that a temperature of the liquid crystal material is set to a temperature within +5° C. of a phase transition temperature between a blue phase and an isotropic phase, at which the liquid crystal material exhibits an isotropic phase, and then the liquid crystal material is irradiated with ultraviolet rays.

10. The method for manufacturing a liquid crystal display device according to claim 6 , wherein the liquid crystal material includes a photocurable resin.

11. A method for manufacturing a liquid crystal display device, comprising the steps of:
forming a first sealant so as to form a frame over a first substrate;
forming a second sealant on an outer side of the first sealant over the first substrate;
dropping a liquid crystal material on an inner side of the first sealant;
attaching a second substrate to the first substrate;
performing polymer stabilization treatment on the liquid crystal material; and
curing the first sealant through heat treatment,
wherein the first sealant is a thermosetting sealant,
wherein the second sealant is a photocurable and thermosetting sealant, and
wherein the polymer stabilization treatment is performed before the second sealant is pre-cured.

12. The method for manufacturing a liquid crystal display device according to claim 11 , wherein as the liquid crystal material, a material which exhibits a blue phase at a given temperature is used.

13. The method for manufacturing a liquid crystal display device according to claim 11 , wherein the polymer stabilization treatment is performed in such a manner that the heat treatment is performed so that a temperature of the liquid crystal material is set to a temperature at which the liquid crystal material exhibits a blue phase, and then the liquid crystal material is irradiated with ultraviolet rays.

14. The method for manufacturing a liquid crystal display device according to claim 11 , wherein the polymer stabilization treatment is performed in such a manner that the heat treatment is performed so that a temperature of the liquid crystal material is set to a temperature within +5° C. of a phase transition temperature between a blue phase and an isotropic ph

Assignees

• Ishitani Tetsuji
• Kubota Daisuke
• Tamura Tomohiro
• Semiconductor Energy Lab

Inventors

• Ishitani Tetsuji
• Kubota Daisuke
• Tamura Tomohiro

Classifications

• G02F2001/13793

  Physics · mapped topic

• G02F2001/13415

  Physics · mapped topic

• G02F1/1339

  Gaskets; Spacers; Sealing of cells · CPC title

• G02F1/1341 Primary

  Filling or closing of cells · CPC title

• Y10T156/1052

  with cutting, punching, tearing or severing · CPC title