Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9280022-B2
Application number	US-201313899035-A
Country	US
Kind code	B2
Filing date	May 21, 2013
Priority date	May 21, 2012
Publication date	Mar 8, 2016
Grant date	Mar 8, 2016

Abstract

An LCD device includes first and second substrates facing each other, a sealant formed between the first and second substrates, and adhering the first substrate to the second substrate, and a liquid crystal layer formed between the first and second substrates. The liquid crystal layer includes liquid crystal and an additive having a dipole moment characteristic when an electric field is applied thereto, thus enhancing a response time of the liquid crystal.

First claim

What is claimed is:

1. A liquid crystal display (LCD) device, comprising:
first and second substrates facing each other;
a sealant formed between the first and second substrates, and adhering the first substrate to the second substrate; and
a liquid crystal layer formed between the first and second substrates,
wherein the liquid crystal layer comprises a mixture of liquid crystal and an additive having a dipole moment characteristic when an electric field is applied thereto, the liquid crystal being negative liquid crystal, the additive having non-liquid crystal material properties.

2. The LCD device of claim 1 , wherein an average diameter of the additive is 5 nm to 100 nm.

3. The LCD device of claim 1 , wherein the additive is added by 0.1 wt % to 5 wt % of entire weight of the liquid crystal layer.

4. The LCD device of claim 1 , wherein the liquid crystal has an absolute value (|Δ∈|) of dielectric anisotropy in the range of 2 to 20.

5. The LCD device of claim 1 , wherein the additive comprises ZrO 2 particles.

6. The LCD device of claim 1 , wherein the liquid crystal includes a plurality of liquid crystal molecules and wherein size of the additive is larger than size of each one of the liquid crystal molecules such that a rotation motion of the additive causes the liquid crystal molecules to rotate.

7. The LCD device of claim 1 , wherein a plurality of pixel electrodes and common electrodes for driving the liquid crystal are formed on the first substrate.

8. The LCD device of claim 7 , wherein the plurality of pixel electrodes and common electrodes are alternatively arranged to generate lateral electric fields.

9. The LCD device of claim 7 , wherein the plurality of pixel electrodes and common electrodes are disposed in the same layer on the first substrate.

10. The LCD device of claim 7 , wherein the plurality of pixel electrodes and common electrodes are disposed in different layers on the first substrate.

11. The LCD device of claim 1 , wherein the negative liquid crystal has a material expressed by the following formula:

wherein each of R and R′ is hydrogen, an alkyl group, an alkenyl group, or an alkoxy group.

12. The LCD device of claim 1 , wherein the negative liquid crystal has a material expressed by the following formula:

wherein each of R and R′ is hydrogen, an alkyl group, an alkenyl group, or an alkoxy group.

13. The LCD device of claim 1 , wherein the negative liquid crystal has a material expressed by the following formula:

wherein each of R and R′ is hydrogen, an alkyl group, an alkenyl group, or an alkoxy group.

14. A liquid crystal display (LCD) device, comprising:
first and second substrates facing each other;
a sealant formed between the first and second substrates, and adhering the first substrate to the second substrate;
a liquid crystal layer formed between the first and second substrates and including a plurality of liquid crystal molecules, the plurality of liquid crystal molecules being negative liquid crystal molecules; and
a plurality of particles dispersed in the liquid crystal layer and configured to rotate when an electric field is applied thereto such that torque is transferred to the liquid crystal molecules adjacent to each particle, wherein the plurality of particles have non-liquid crystal material properties.

15. The LCD device of claim 14 , wherein the particles have a dipole moment characteristic.

16. The LCzzD device of claim 14 , wherein size of a liquid crystal molecule is smaller than size of a particle.

17. The LCD device of claim 14 , wherein the particles comprise ZrO 2 particles.

Assignees

• Lg Display Co Ltd

Inventors

• Eom You Hyun
• Choi Yun Hee

Classifications

• C09K19/02

  characterised by optical, electrical or physical properties of the components, in general · CPC title

• C09K19/54

  Additives having no specific mesophase {characterised by their chemical composition} · CPC title

• C09K19/12

  at least two benzene rings directly linked, e.g. biphenyls · CPC title

• C09K2019/0466

  the linking chain being a -CF2O- chain · CPC title

• C09K2019/3016

  Cy-Ph-Ph · CPC title