Liquid crystal materials, methods of fabricating liquid crystal display panels and liquid crystal display panels

• US 10,308,874 B2
• Filed: 05/13/2016
• Issued: 06/04/2019
• Est. Priority Date: 04/22/2016
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Lan, Song, Lee, Yungjui
• Primary Examiner(s): Kelly, Cynthia H
• Assistant Examiner(s): Malloy, Anna
• Application Number:
  US15/109,128
• Publication Number:
  US 20180120652A1
• Time in Patent Office: 1,117 Days
• Field of Search: None
• CPC Class Codes: C09K 19/3028 in which at least two rings are linked by a carbon chain containing carbon to carbon single bonds
• CPC Class Codes: C09K 19/3068 chain containing -COO- or -OCO- groups
• CPC Class Codes: C09K 19/3458 Uncondensed pyrimidines
• CPC Class Codes: C09K 19/38 Polymers
• CPC Class Codes: C09K 19/56 Aligning agents
• CPC Class Codes: C09K 2019/3004 Cy-Cy
• CPC Class Codes: C09K 2019/3016 Cy-Ph-Ph
• CPC Class Codes: C09K 2019/3036 Cy-C2H4-Ph
• CPC Class Codes: C09K 2019/3075 Cy-COO-Ph
• CPC Class Codes: C09K 2019/3083 Cy-Ph-COO-Ph
• CPC Class Codes: G02F 1/0316 Electrodes
• CPC Class Codes: G02F 1/1303 Apparatus specially adapted to the manufacture of LCDs
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133703 by introducing organic surfactant additives into the liquid crystal material
• CPC Class Codes: G02F 1/133788 by light irradiation, e.g. linearly polarised light photo-polymerisation
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making

Abstract

The liquid crystal material of the disclosure includes liquid crystal molecules, polymerizable monomers and a vertical alignment agent, wherein the polymerizable monomers and the vertical alignment agent can be polymerized under ultraviolet irradiation to form a polymer, while the polymer deposits on a substrate to form a polymer film capable of replacing the PI alignment film; so that an alignment process of the liquid crystal is simplified, and a cost is economized. The method of fabricating the liquid crystal display panel of the disclosure eliminates the fabricating process of the alignment film.

Claims

1. A liquid crystal material, comprising liquid crystal molecules, vertical alignment agent, and polymerizable monomers;

wherein

the vertical alignment agent comprises one or more than one of the following compounds;

2. The liquid crystal material according to claim 1, wherein, in the liquid crystal material, a mass percentage of the liquid crystal molecules is 94.0%˜

98.6%, a mass percentage of the vertical alignment agent is 1.0%˜

5.0%, and a mass percentage of the polymerizable monomers is 0.3%˜

0.5%; and

the polymerizable monomers comprise one or a combination of more than one of acrylates, acrylate derivatives, methacrylates, methacrylate derivatives, styrene, styrene derivatives, and epoxy resin.

3. The liquid crystal material according to claim 1, wherein the liquid crystal material further comprises a photo initiator, a mass percentage of the photo initiator is 0.1%˜

0.5%, the photo initiator comprises one or a combination of more than one of azobisisobutyronitrile, dialkyl peroxide base compounds, diacyl peroxide base compounds, and lipid peroxide base compounds.

4. A method of fabricating a liquid crystal display panel, comprising the following steps:

step 1, providing an upper substrate, a lower substrate, and a liquid crystal material;

the upper substrate comprising a first substrate, and a first electrode disposed on the first substrate;

the lower substrate comprising a second substrate, and a second electrode disposed on the second substrate;

the liquid crystal material comprising liquid crystal molecules, a vertical alignment agent, and polymerizable monomers;

the vertical alignment agent comprising one or more than one of the following compounds;

5. The method of fabricating the liquid crystal display panel according to claim 4, wherein, in the liquid crystal material, a mass percentage of the liquid crystal molecules is 94.0%˜

98.6%, a mass percentage of the vertical alignment agent is 1.0%˜

5.0%, and a mass percentage of the polymerizable monomers is 0.3%˜

0.5%; and

the polymerizable monomers comprise one or a combination of more than one of acrylates, acrylate derivatives, methacrylates, methacrylate derivatives, styrene, styrene derivatives, and epoxy resin.

6. The method of fabricating the liquid crystal display panel according to claim 4, wherein the liquid crystal material further comprises a photo initiator, a mass percentage of the photo initiator is 0.1%˜

0.5%, the photo initiator comprises one or a combination of more than one of azobisisobutyronitrile, dialkyl peroxide base compounds, diacyl peroxide base compounds, and lipid peroxide base compounds.

7. The method of fabricating the liquid crystal display panel according to claim 4, wherein, in step 3, the voltage applied to the both sides of the liquid crystal material is 13˜

25V;

in the first ultraviolet irradiation of step 3, an illumination intensity of the ultraviolet is 85˜

100 mW/cm², an irradiation time is 20˜

30 min; and

in the second ultraviolet irradiation of step 4, an illumination intensity of the ultraviolet is 85˜

100 mW/cm², an irradiation time is 90˜

120 min.

8. The method of fabricating the liquid crystal display panel according to claim 4, wherein, in step 1, the upper substrate and the lower substrate are a thin film transistor (TFT) substrate and a color filter (CF) substrate respectively;

the first electrode and the second electrode are a pixel electrode and a common electrode respectively; and

in step 3 and step 4, the first and the second ultraviolet irradiations are performed from the side of the upper substrate.

9. A liquid crystal display panel, comprising:

oppositely disposed an upper substrate and a lower substrate, a liquid crystal layer disposed between the upper substrate and the lower substrate, a first polymer film disposed on the upper substrate toward a side surface of the liquid crystal layer, and a second polymer film disposed on the lower substrate toward a side surface of the liquid crystal layer;

wherein the upper substrate comprises a first substrate and a first electrode disposed on the first substrate;

the lower substrate comprises a second substrate and a second electrode disposed on the second substrate;

the liquid crystal layer comprises liquid crystal molecules;

the liquid crystal molecules in the liquid crystal layer near the first polymer film and the second polymer film arrange at a certain inclination angle between the upper substrate and the lower substrate;

the liquid crystal molecules in the liquid crystal layer away from the first polymer film and the second polymer film arrange perpendicular to the upper substrate and the lower substrate;

wherein both the first polymer film and the second polymer film have rough surfaces;

the vertical alignment agent comprises one or more than one of the following compounds;

10. The liquid crystal display panel according to claim 9, wherein the polymerizable monomers comprise one or a combination of more than one of acrylates, acrylate derivatives, methacrylates, methacrylate derivatives, styrene, styrene derivatives, and epoxy resin;

and thicknesses of the first polymer film and the second polymer film are 600˜

1200 Å

.