Liquid crystal display and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2016209708-A1
Application number	US-201514956014-A
Country	US
Kind code	A1
Filing date	Dec 1, 2015
Priority date	Jan 20, 2015
Publication date	Jul 21, 2016
Grant date	—

Abstract

A liquid crystal display according to an exemplary embodiment of the present invention includes a first insulation substrate where a pixel electrode is formed; a second insulation substrate where a common electrode is formed while the second insulation substrate faces the first insulation substrate; a first alignment layer positioned in the first insulation substrate; a second alignment layer positioned in the second insulation substrate; and a liquid crystal layer positioned between the first insulation substrate and the second insulation substrate, in which the first alignment layer and the second alignment layer include an additive, and the additive is a mixture of two or more reactive mesogens selected from the group consisting of the following Chemical Formulas 1-1 to 1-15.

In Chemical Formulas 1-4 to 1-15, X's are each independently H, CH 3 , (CH 2 ) n CH 3 , F, Br, I, OH, C 3 H 7 , NH 2 , or CN, R's are each independently any one of

and n is 1 to 20.

First claim

What is claimed is:

1 . A liquid crystal display comprising:
a first insulation substrate where a pixel electrode is formed; a second insulation substrate where a common electrode is formed while the second insulation substrate faces the first insulation substrate; a first alignment layer positioned in the first insulation substrate; a second alignment layer positioned in the second insulation substrate; and a liquid crystal layer positioned between the first insulation substrate and the second insulation substrate, wherein the first alignment layer and the second alignment layer include an additive, and the additive is a mixture of two or more reactive mesogens selected from the group consisting of the following Chemical Formulas 1-1 to 1-15:

in Chemical Formulas 1-4 to 1-15,
X's are each independently H, CH 3 , (CH 2 ) n CH 3 , F, Br, I, OH, C 3 H 7 , NH 2 , or CN,
R's are each independently any one of

and n is 1 to 20.

2 . The liquid crystal display of claim 1 , wherein the additive is included in a content of 15 wt % to 50 wt % in the alignment layer.

3 . The liquid crystal display of claim 1 , wherein the additive includes two compounds selected from the group consisting of compounds of Chemical Formulas 1-1 to 1-15, and each compound is included in a content of 15 wt % or less in the alignment layer.

4 . The liquid crystal display of claim 1 , wherein
the additive includes each of the compound of Chemical Formula 1-2 and the compound of Chemical Formula 1-3 in a content of 15 wt % or less.

5 . The liquid crystal display of claim 1 , wherein the alignment layer includes a compound represented by the following Chemical Formula 2:

in Chemical Formula 2,
A is any one of

B is any one of

X is any one of

Y is any one of

M is any one of

Z is any one of

T is any of

n is 0 to 20.

6 . The liquid crystal display of claim 1 , wherein the alignment layer includes a compound represented by the following Chemical Formula 4 and a compound represented by the following Chemical Formula 5:

7 . The liquid crystal display of claim 6 , wherein a ratio of a, b, and c of Chemical Formula 4 is 5:3:2.

8 . The liquid crystal display of claim 6 , wherein a ratio of a′, b′, and c′ of Chemical Formula 5 is 3:3:4.

9 . The liquid crystal display of claim 6 , wherein the compounds of Chemical Formulas 4 and 5 are mixed at a weight ratio of 7:3.

10 . The liquid crystal display of claim 1 , wherein the pixel electrode includes a cross-shaped stem portion and fine branch portions extending in four diagonal directions from the cross-shaped stem portion.

11 . A method of manufacturing a liquid crystal display, comprising:
preparing a lower panel where a pixel electrode is formed and an upper panel where a common electrode is formed; applying an alignment layer solution including two kinds or more of reactive mesogens as an additive on the lower panel or the upper panel, and drying the alignment layer solution; injecting a liquid crystal between the lower panel and the upper panel to form a display panel assembly; annealing the display panel assembly to elute the reactive mesogen in an alignment layer into a liquid crystal layer; and radiating ultraviolet rays on the display panel assembly to react the reactive mesogen and thus form a pretilt.

12 . The method of claim 11 , the additive is a mixture of two or more reactive mesogens selected from the group consisting of the following Chemical Formulas 1-1 to 1-15:

in Chemical Formulas 1-4 to 1-15,
X's are each independently H, CH 3 , (CH 2 ) n CH 3 , F, Br, I, OH, C 3 H 7 , NH 2 , or CN,
R's are each independently any one of

and n is 1 to 20.

13 . The method of claim 12 , the additive is included in a content of 15 wt % to 50 wt % in the alignment layer solution.

14 . The method of claim 11 , the additive includes two compounds selected from the group consisting of compounds of Chemical Formulas 1-1 to 1-15, and each compound is included in a content of 15 wt % or less based on the alignment layer solution.

15 . The method of claim 11 , wherein the radiating of the ultraviolet rays on the display panel assembly to react the reactive mesogen and thus form the pretilt is performed in a state where an electric field is applied to the display panel assembly.

16 . The method of claim 15 , further comprising
after the radiating of the ultraviolet rays on the display panel assembly to react the reactive mesogen and thus form the pretilt, additionally radiating the ultraviolet rays to remove an unreacted residual reactive mesogen.

17 . The method of claim 11 , the alignment layer solution includes a compound represented by the following Chemical Formula 2:

in Chemical Formula 2,
A is any one of

B is any one of

X is any one of

Y is any one of

M is any one of

Z is any one of

T is any of

n is 0 to 20.

18 . The method of claim 11 , the alignment layer solution includes a compound represented by the following Chemical Formula 4 and a compound rep

Assignees

• Samsung Display Co Ltd

Inventors

• Lim Ho
• Kim Tae Min

Classifications

• G02F1/1341

  Filling or closing of cells · CPC title

• G02F1/13378

  by treatment of the surface, e.g. embossing, rubbing or light irradiation (G02F1/133711, G02F1/133734, G02F1/133753 take precedence) · CPC title

• G02F1/133345

  Insulating layers (G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence) · CPC title

• G02F1/133788

  by light irradiation, e.g. linearly polarised light photo-polymerisation · CPC title

• G02F1/133711 Primary

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