Liquid crystal display panel and liquid crystal display apparatus having the same

Patent metadata

Field	Value
Publication number	US-9487699-B2
Application number	US-201414462349-A
Country	US
Kind code	B2
Filing date	Aug 18, 2014
Priority date	Oct 18, 2013
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

A liquid crystal display panel includes a first substrate including a pixel electrode, a second substrate a second substrate including a common electrode and disposed opposite to the first substrate, and a liquid crystal layer between the first substrate and the second substrate, where the liquid crystal layer includes liquid crystal molecules having an elastic coefficient of bend phase (K 33 ) and an elastic coefficient of splay phase (K 11 ), and a ratio of the elastic coefficient of bend phase (K 33 ) to the elastic coefficient of splay phase (K 11 ) of the liquid crystal molecules in the liquid crystal layer is in a range of about 0.96 to about 1.25.

First claim

What is claimed is:

1. A liquid crystal display panel comprising:
a first substrate comprising a pixel electrode;
a second substrate comprising a common electrode, and disposed opposite to the first substrate; and
a liquid crystal layer disposed between the first substrate and the second substrate,
wherein
the liquid crystal layer comprises liquid crystal molecules having an elastic coefficient of bend phase (K 33 ) and an elastic coefficient of splay phase (K 11 ), and
a ratio of the elastic coefficient of bend phase (K 33 ) to the elastic coefficient of splay phase (K 11 ) of the liquid crystal molecules in the liquid crystal layer is in a range of about 0.98 to about 1.19 at a temperature in a range of about 26° C. to about 35° C.

2. The liquid crystal display panel of claim 1 , wherein a longitudinal axis of the liquid crystal molecules is aligned substantially perpendicular to the first substrate and the second substrate, when a voltage is not applied to the electrodes.

3. The liquid crystal display panel of claim 2 , wherein the longitudinal axis of the liquid crystal molecules is aligned substantially perpendicular to an electric field, when a voltage is applied to the electrodes.

4. The liquid crystal display panel of claim 3 , wherein the voltage is in a range of about 10 volts to about 20 volts.

5. The liquid crystal display panel of claim 1 , wherein the ratio of the elastic coefficient of bend phase (K 33 ) to the elastic coefficient of splay phase (K 11 ) of the liquid crystal molecules in the liquid crystal layer is in the range of about 0.96 to about 1.25 at a temperature in a range of about 15° C. to about 25° C.

6. The liquid crystal display panel of claim 1 , wherein the ratio of the elastic coefficient of bend phase (K 33 ) to the elastic coefficient of splay phase (K 11 ) of the liquid crystal molecules in the liquid crystal layer is in a range of about 1.00 to about 1.19 at a temperature in a range of about 36° C. to about 45° C.

7. The liquid crystal display panel of claim 1 , wherein a gap between the first substrate and the second substrate is in a range of about 2.0 micrometers to about 4.0 micrometers.

8. The liquid crystal display panel of claim 1 , wherein a transition temperature of the liquid crystal layer is in a range of about 70° C. to about 110° C.

9. The liquid crystal display panel of claim 1 , wherein the liquid crystal molecules have a negative dielectric anisotropy.

10. The liquid crystal display panel of the claim 1 , wherein the liquid crystal layer comprises a reactive mesogen comprising an acrylate group.

11. The liquid crystal display panel of the claim 10 , wherein a content of the reactive mesogen is in a range of about 0.01 weight percent to about 1.0 weight percent based on the total weight of the liquid crystal layer.

12. A liquid crystal display apparatus comprising:
a liquid crystal display panel comprising:
a first substrate comprising a pixel electrode;
a second substrate comprising a common electrode, and disposed opposite to the first substrate; and
a liquid crystal layer disposed between the first substrate and the second substrate, wherein the liquid crystal layer comprises liquid crystal molecules having an elastic coefficient of bend phase (K 33 ) and an elastic coefficient of splay phase (K 11l ), and a ratio of the elastic coefficient of bend phase (K 33 ) to the elastic coefficient of splay phase (K 11 ) of the liquid crystal molecules in the liquid crystal layer is in a range of about 0.98 to about 1.19 at a temperature in a range of about 26° C. to about 35° C.; and

a backlight assembly disposed on a lower surface of the liquid crystal display panel, and which provides light to the liquid crystal display panel.

13. The liquid crystal display apparatus of claim 12 , wherein a longitudinal axis of the liquid crystal molecules is aligned substantially perpendicular to the first substrate and the second substrate, when a voltage is not applied to the electrodes.

14. The liquid crystal display apparatus of claim 13 , wherein the longitudinal axis of the liquid crystal molecules is aligned substantially perpendicular to an electric field, when a voltage is applied to the electrodes.

15. The liquid crystal display apparatus of claim 12 , wherein the ratio of the elastic coefficient of bend phase (K 33 ) to the elastic coefficient of splay phase (K 11 ) of the liquid crystal molecules in the liquid crystal layer is in the range of about 0.96 to about 1.25 at a temperature in a range of about 15° C. to about 25° C.

16. The liquid crystal display apparatus of claim 12 , wherein the ratio of the elastic coefficient of bend phase (K 33 ) to the elastic coefficient of splay phase (K 11 ) of the liquid crystal molecules in the liquid crystal layer is in a range of about 1.00 to about 1.19 at a temperature in a range of about 36° C. to about 45° C.

17. The liquid crystal display apparatus of claim 12 , wherein a gap between the first substrate and the second substrate is in a range of about 2.0 micrometers to about 4.0 micrometers.

18. The liquid crystal display apparatus of claim 12 , wherein the liquid crystal molecules have a negative dielectric anisotropy.

Assignees

• Samsung Display Co Ltd

Inventors

• Rho Soon-Joon
• Kim Kyung-Min
• Kim Jin-Lak
• Jang Hye-Lim
• Oh Keun-Chan

Classifications

• C09K19/02 Primary

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

• G02F1/137 Primary

  characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering · CPC title