Liquid crystal display and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-9436039-B2
Application number	US-201414315974-A
Country	US
Kind code	B2
Filing date	Jun 26, 2014
Priority date	Sep 2, 2013
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

A liquid crystal display may include: a first substrate, a second substrate facing the first substrate, a field generating electrode disposed on at least one of the first substrate and the second substrate, an alignment layer disposed on the field generating electrode, and a liquid crystal layer disposed between the first substrate and the second substrate. The alignment layer may include a lower layer including an organic material and an upper layer disposed on the lower layer and including an inorganic material.

First claim

What is claimed is:

1. A liquid crystal display comprising:
a first substrate;
a second substrate facing the first substrate;
a field generating electrode on at least one of the first substrate and the second substrate;
an alignment layer on the field generating electrode; and
a liquid crystal layer between the first substrate and the second substrate,
wherein the alignment layer includes:
a lower layer including an organic material and on the field generating electrode,
an upper layer on the lower layer and including a polysiloxane-containing material, the upper layer including a plurality of island shape portions on the lower layer.

2. The liquid crystal display as claimed in claim 1 , wherein:
the upper layer and the lower layer are layer-separated.

3. The liquid crystal display as claimed in claim 1 , wherein:
the lower layer is in contact with the field generating electrode.

4. The liquid crystal display as claimed in claim 1 , wherein:
each of the island shape portions includes a main chain and a side chain connected to the main chain,
the main chain includes polysiloxane, and
the side chain includes a photo-reactive group.

5. The liquid crystal display as claimed in claim 4 , wherein:
the side chain of each of island shape portions includes at least one of a compound represented by the following Chemical Formula 1 and a compound represented by the following Chemical Formula 2:

wherein in Chemical Formula 1 and Chemical Formula 2 RM is

Sp is a carbon chain structure represented by —(CH 2 ) n —, in which n is 2 to 10, M is any one of benzene, cyclohexane,

and X is

6. The liquid crystal display as claimed in claim 5 , wherein:
the lower layer includes the main chain and the side chain connected to the main chain, the main chain includes polyimide, and the side chain includes a vertical alignment group.

7. The liquid crystal display as claimed in claim 6 , wherein:
the side chain of the lower layer includes at least one of a compound represented by the following Chemical Formula 3 and a compound represented by the following Chemical Formula 4:

wherein in Chemical Formula 3 and Chemical Formula 4, A is an alkyl group having 3 to 30 carbon atoms, M is any one of benzene, cyclohexane,

and X is

8. The liquid crystal display as claimed in claim 7 , further comprising:
a column spacer between the first substrate and the second substrate,
wherein the alignment layer covers the column spacer in a uniform thickness.

9. The liquid crystal display as claimed in claim 8 , wherein:
the alignment layer includes a portion disposed between the column spacer and any one of the first substrate and the second substrate.

10. The liquid crystal display as claimed in claim 1 , wherein:
the liquid crystal layer includes a liquid crystal material and an alignment polymer.

11. A method for manufacturing a liquid crystal display, comprising:
forming a field generating electrode on at least one of a first substrate and a second substrate facing the first substrate;
forming an alignment layer on the field generating electrode;
forming a liquid crystal layer between the first substrate and the second substrate; and
irradiating light on the alignment layer,
wherein the alignment layer includes a lower layer including an organic material and an upper layer on the lower layer and including a polysiloxane-containing material, the upper layer being formed of a plurality of island shape portions on the lower layer.

12. The method for manufacturing a liquid crystal display as claimed in claim 11 , wherein:
the forming of the alignment layer includes:
adding an inorganic material of a monomolecule to a solution including the organic material of a polymer to form an organic and inorganic mixture material,
applying the organic and inorganic mixture material on the field generating electrode,
heat-treating the organic and inorganic mixture material, and
layer-separating the organic material and the inorganic material to form the upper layer and the lower layer.

13. The method for manufacturing a liquid crystal display as claimed in claim 12 , wherein:
the lower layer is in contact with the field generating electrode.

14. The method for manufacturing a liquid crystal display as claimed in claim 13 , wherein:
the inorganic material of the monomolecule includes siloxane and a photo-reactive group.

15. The method for manufacturing a liquid crystal display as claimed in claim 14 , wherein:
the inorganic material of the monomolecule includes at least one of a compound represented by the following Chemical Formula 5 and a compound represented by the following Chemical Formula 6:

wherein in Chemical Formula 5 and Chemical Formula 6, RM is

Sp is a carbon chain structure represented by —(CH 2 ) n —, in which n is 2 to 10, M is any one of benzene, cyclohexane,

and X is

16. The method for manufacturing a liquid crystal display as claimed in claim 15 , wherein:
the organic material of the polymer includes polyimide to which a vertical alignment group is connected as a side chain.

17. The method for manufacturing a liquid crystal display as claimed in claim 16 , wherein:
the vertical alignment group includes at least one of a compound represented by the following Chemical Formula 3 and a compound represented by the following Chemical Formula 4:

wherein in Chemical Formula 3 and Chemical Formula 4, A is an alkyl group having 3 to 30 carbon atoms, M is any one of benzene, cyclohexane,

and X is

18. The method for manufacturing a liquid crystal display as claimed in claim 17 , further comprising:
applying an electric field to the liquid crystal layer before irradiating the light on the alignment layer.

19. The method for manufacturing a liquid crystal display as claimed in claim 11 , further comprising:
forming a column spacer on the first substrate or the second substrate before the forming of the alignment layer,
wherein the alignment layer covers the column spacer in a uniform thickness.

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Taek Joon
• Ahn Hyun Ku
• Lyu Jae Jin

Classifications

• G02F1/133711 Primary

  by organic films, e.g. polymeric films · CPC title

• G02F1/133707

  Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes · CPC title

• G02F1/1337 Primary

  Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers · CPC title

• G02F2001/133726

  Physics · mapped topic

• Y10T428/10

  Cross-Sectional Technologies · mapped topic