Liquid crystal display and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-10503017-B2
Application number	US-201715499091-A
Country	US
Kind code	B2
Filing date	Apr 27, 2017
Priority date	May 10, 2016
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

A liquid crystal display including: a first substrate; a second substrate configured to overlap the first substrate and to be separate from the first substrate; a liquid crystal layer disposed between the first substrate and the second substrate and including a liquid crystal molecule; a first alignment layer disposed between the first substrate and the liquid crystal layer; a second alignment layer disposed between the second substrate and the liquid crystal layer; and a plurality of protrusions disposed between the first alignment layer and the liquid crystal layer, wherein at least one protrusion of the plurality of protrusions includes an orientation polymer including a polymerized reactive mesogen, the first alignment layer includes a photo-reactive group, and the liquid crystal layer includes a photoreaction initiator.

First claim

What is claimed is:

1. A liquid crystal display comprising:
a first substrate;
a second substrate configured to overlap the first substrate and to be separate from the first substrate;
a liquid crystal layer disposed between the first substrate and the second substrate, and comprising a liquid crystal molecule;
a first alignment layer disposed between the first substrate and the liquid crystal layer; a second alignment layer disposed between the second substrate and the liquid crystal layer; and
a plurality of protrusions disposed between the first alignment layer and the liquid crystal layer,
wherein at least one protrusion of the plurality of protrusions comprises an orientation polymer comprising a polymerized reactive mesogen,
wherein the first alignment layer comprises an alignment polymer comprising a main chain, and a photo-reactive group connected as a side chain to the main chain,
wherein the orientation polymer and the alignment polymer are different polymers,
wherein the photo-reactive group comprises a structure of at least one compound represented by the following Chemical Formulas 3 to 15:

wherein the liquid crystal layer comprises a photoreaction initiator comprising at least one compound represented by the Chemical Formulas 3 to 15, and
wherein a liquid crystal molecule adjacent to the first alignment layer has a pretilt angle greater than a liquid crystal molecule adjacent to the second alignment layer.

2. The liquid crystal display of claim 1 , wherein the liquid crystal display is a curved liquid crystal display.

3. The liquid crystal display of claim 1 , wherein a protrusion is not present between the second alignment layer and the liquid crystal layer.

4. The liquid crystal display of claim 1 , further comprising
a plurality of protrusions disposed between the second alignment layer and the liquid crystal layer,
wherein a number of the plurality of protrusions disposed between the second alignment layer and the liquid crystal layer is about 5% or less of a number of the plurality of protrusions disposed between the first alignment layer and the liquid crystal layer.

5. The liquid crystal display of claim 1 , wherein an amount of the photoreaction initiator in the liquid crystal layer is about 1 weight percent or less with respect to a total weight of the liquid crystal layer.

6. The liquid crystal display of claim 1 , wherein the second alignment layer does not comprise a photo-reactive group.

7. The liquid crystal display of claim 1 , wherein the reactive mesogen is a compound having three or more ring structures.

8. The liquid crystal display of claim 7 , wherein the reactive mesogen comprises an acrylate group or methacrylate group at an end thereof.

9. The liquid crystal display of claim 7 , wherein the reactive mesogen comprises a compound represented by the following Chemical Formula 1 or Chemical Formula 2:
[Chemical Formula 1]

10. A method of manufacturing a liquid crystal display, the method comprising:
providing a first display panel comprising a first alignment layer comprising an alignment polymer and a reactive mesogen, wherein the alignment polymer comprises a main chain and a photo-reactive group connected as a side chain to the main chain;
providing a second display panel comprising a second alignment layer;
forming a liquid crystal layer comprising a liquid crystal molecule and a photoreaction initiator between the first display panel and the second display panel;
eluting the reactive mesogen from the first alignment layer into the liquid crystal layer by applying heat; and
irradiating ultraviolet light onto the first display panel, the second display panel, and the liquid crystal layer,
wherein in the irradiating of the ultraviolet light, a plurality of protrusions comprising an orientation polymer comprising a polymerized reactive mesogen, are formed between the first alignment layer and the liquid crystal layer,
wherein the orientation polymer and the alignment polymer are different polymers,
wherein the photo-reactive group comprises a structure of at least one compound represented by the following Chemical Formulas 3 to 15:

wherein the photoreaction initiator comprises at least one compound represented by the Chemical Formulas 3 to 15, and
wherein a liquid crystal molecule adjacent to the first alignment layer has a pretilt angle greater than a liquid crystal molecule adjacent to the second alignment layer.

11. The method of claim 10 , wherein the reactive mesogen in the first alignment layer is in the form of a mixture.

12. The method of claim 10 , wherein the reactive mesogen is a compound having three or more ring structures.

13. The method of claim 12 , wherein the reactive mesogen includes a compound represented by the following Chemical Formula 1 or Chemical Formula 2:

14. The method of claim 10 , wherein a plurality of protrusions are formed between the second alignment layer and the liquid crystal layer in the irradiating of the ultraviolet light, and
a number of the plurality of protrusions disposed between the second alignment layer and the liquid crystal layer is about 5% or less of a number of the plurality of protrusions disposed between the first alignment layer and the liquid crystal layer.

Assignees

• Samsung Display Co Ltd

Inventors

• Cho Jae Bum
• Lee Hyeok Jin
• Kwon Oh Jeong
• Kim Ka Eun
• Kim Su Jin

Classifications

• G02F2201/56

  Substrates having a particular shape, e.g. non-rectangular · CPC title

• G02F1/133707 Primary

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

• G02F2202/023

  curable · CPC title

• C09K19/56

  Aligning agents · CPC title

• G02F2202/022

  polymeric · CPC title