Liquid crystal display device and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-9366898-B2
Application number	US-201213698779-A
Country	US
Kind code	B2
Filing date	Sep 14, 2012
Priority date	Sep 15, 2011
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

According to the present invention, there are disclosed a liquid crystal display device and method for manufacturing the same. The liquid crystal display device comprises: a color filter substrate, an array substrate and a liquid crystal composite system filled between the color filter substrate and the array substrate, wherein liquid crystals and a high molecular polymer network, which is formed by polymerization of liquid crystalline polymerizable monomers, are included in the liquid crystal composite system.

First claim

What is claimed is:

1. A liquid crystal display device, comprising: a color filter substrate, an array substrate and a liquid crystal composite system filled between the color filter substrate and the array substrate,
wherein liquid crystals and a high molecular polymer network, which is formed by polymerization of liquid crystalline polymerizable monomers, are included in the liquid crystal composite system,
wherein the liquid crystals are distributed in the high molecular polymer network and its surroundings,
wherein mass of the liquid crystalline polymerizable monomers is 4% to 8% of mass of the liquid crystals.

2. The device claimed as claim 1 , wherein the high molecular polymer network has directionality.

3. The device claimed as claim 1 , wherein an alignment layer is disposed on at least one of opposed surfaces of the color substrate and the array substrate, the alignment layer has an orientational direction, and an extending direction of a polymer main chain in the high molecular polymer network is substantially parallel to the orientational direction of the alignment film.

4. The device claimed as claim 3 , wherein the extending direction of the polymer main chain in the high molecular polymer network is determined by arrangement direction of the liquid crystalline polymerizable monomers prior to polymerization, the arrangement direction of the liquid crystalline polymerizable monomers is determined by arrangement direction of the liquid crystal molecules, and the arrangement direction of the liquid crystal molecules is determined by the orientational direction of the alignment layer.

5. The device claimed as claim 1 , wherein a rigid functional group and a flexible function group are included in the molecular structure at a boundary of the high molecular polymer network, and the rigid functional group determines an anchoring function of the network on the liquid crystal molecules.

6. The device claimed as claim 5 , wherein the rigid functional group comprises a diphenyl functional group, and the flexible functional group comprises an alkyl functional group.

7. The device claimed as claim 1 , wherein the polymerization reaction by which the high molecular polymer network is generated by the liquid crystalline polymerizable monomers has irreversibility.

8. The device claimed as claim 1 , wherein the liquid crystalline polymerizable monomers are C6M or derivatives of C6M, wherein the derivatives of C6M comprises 1,4-bi(4-(6′-propylene oxyl hexyloxy)benzoyloxy)-2-chlorobenzene; 1,4-bi(4-(6′-propylene oxyl hexyloxy)benzoyloxy)-benzene; 1,4-bi(4-(6′-propylene oxyl hexyloxy)benzoyloxy)-2,3-dimethyl benzene; 1,4-bi(4-(6′-propylene oxyl hexyloxy)biphenyl methanoyl)-2-benzene; 1,4-bi(4-(6′-propylene oxyl hexyloxy)biphenyl methanoyl)-2-chlorobenzene; 1,4-bi(4-(6′-propylene oxyl hexyloxy)biphenyl methanoyl)-2-methylbenzene; and 1,4-bi(4-(6′-propylene oxyl hexyloxy)biphenyl methanoyl)-2,3-dimethyl benzene.

9. The device claimed as claim 1 , wherein on the array substrate, there are provided a pixel electrode and a common electrode, the pixel electrode and the common electrode being disposed in different layers of the array substrate; between the pixel electrode and the common electrode, there is provided an insulating layer; the common electrode covers the whole pixel region; and the pixel electrode has a slit-like opening.

10. A method for manufacturing a liquid crystal display device, comprising:
adding liquid crystalline polymerizable monomers and a photo initiator into liquid crystals and conducting a stir in darkness, so as to obtain a liquid crystal composite system;
applying the liquid crystal composite system between a color filter substrate and an array substrate, so as to form a primary liquid crystal display device; and
radiating the primary liquid crystal display device with an ultraviolet light, so that the liquid crystalline polymerizable monomers in the liquid crystal composite system in the primary liquid crystal display device are polymerized under the effect of the photo initiator to produce a high molecular polymer network, to thereby obtain the final liquid crystal display device,
wherein the liquid crystals are distributed in the high molecular polymer network and its surroundings,
wherein mass of the liquid crystalline polymerizable monomers is 4% to 8% of mass of the liquid crystals.

11. The method claimed as claim 10 , wherein on at least one of opposed surfaces of the color substrate and the array substrate, there is provided an alignment layer, and the alignment layer has an orientational direction, and
wherein after the liquid crystal composite system is applied between the color filter and the array substrate, the liquid crystals and the liquid crystalline polymerizable monomers each are arranged along the orientational direction of the alignment film.

12. The method claimed as claim 10 , wherein the step of radiating the primary liquid crystal display device with the ultraviolet light is accomplished in an ultraviolet solidification step performed on a sealant in a bonding process.

13. The method claimed as claim 10 , wherein mass of the liquid crystalline polymerizable monomers is less than 10% of mass of the liquid crystals.

14. The device claimed as claim 5 , wherein an extending direction of the rigid functional group is consistent with an initial alignment direction of the liquid crystal molecules, the liquid crystals are deflected along an electrical filed direction in response to the liquid crystal display device being applied with a switch-on voltage, and the liquid crystals return to the initial alignment direction under influence of the high molecular polymer network in response to the liquid crystal display device being applied with a switch-off voltage.

15. The method claimed as claim 10 , wherein a rigid functional group and a flexible function group are included in the molecular structure at a boundary of the high molecular polymer network, and the rigid functional group determines an anchoring function of the network on the liquid crystal molecules,
wherein an extending direction of the rigid functional group is consistent with an initial alignment direction of the liquid crystal molecules, the liquid crystals are deflected along an electrical filed direction in response to the liquid crystal display device being applied with a switch-on voltage, and the liquid crystals return to the initial alignment direction under influence of the high molecular polymer network in response to the liquid crystal display device being applied with a switch-off voltage.

Assignees

• Guo Renwei
• Chen Dong
• Beijing Boe Optoelectronics

Inventors

• Guo Renwei
• Chen Dong

Classifications

• G02F1/134363

  for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS] · CPC title

• C08F2/48

  by ultraviolet or visible light · CPC title

• G02F1/1334 Primary

  based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals · CPC title

• C09K19/38

  Polymers · CPC title

• G02F2001/13345

  Physics · mapped topic