Liquid crystal display and driving method thereof

• US 8,593,583 B2
• Filed: 03/24/2009
• Issued: 11/26/2013
• Est. Priority Date: 06/25/2008
• Status: Expired due to Fees

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Lee, Seung-Hoon, Yeom, Joo-Seok, Kim, Hee-Seop, Kim, Sung-Woon, Lu, Jiangang
• Primary Examiner(s): Hahm, Sarah
• Application Number:
  US12/409,962
• Publication Number:
  US 20090322974A1
• Time in Patent Office: 1,708 Days
• Field of Search: None
• US Class Current: 349/48
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/13624 having more than one switching element per pixel
• CPC Class Codes: G02F 1/1393 the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells G02F1/1396, G02F1/141 take precedence

Abstract

The present invention relates to a liquid crystal display including: a first substrate, a gate line formed disposed on the first substrate, a first data line and a second data lines formed both of which are disposed on the first substrate, and insulated from and intersection disposed substantially perpendicular to the gate line, a first thin film transistor connected to the gate line and the first data line, a second thin film transistor connected to the gate line and the second data line, a first pixel electrode connected to the first thin film transistor, a second pixel electrode connected to the second thin film transistor, a second substrate facing disposed substantially opposite to the first substrate, a common electrode formed disposed on the second substrate, and a liquid crystal layer disposed between the first substrate and the second substrate, and including biaxial liquid crystal.

Claims

1. A liquid crystal display comprising:

a first substrate;

a gate line disposed on the first substrate;

a first data line and a second data line both of which are disposed on the first substrate, and insulated from and disposed substantially perpendicular to the gate line;

a first thin film transistor connected to the gate line and the first data line;

a second thin film transistor connected to the gate line and the second data line;

a first pixel electrode connected to the first thin film transistor;

a second pixel electrode connected to the second thin film transistor;

a second substrate disposed substantially opposite to the first substrate;

a common electrode disposed on the second substrate; and

a liquid crystal layer disposed between the first substrate and the second substrate, and including biaxial liquid crystal,

wherein the liquid crystal display has an initial alignment stage, a pre-tilt stage, and an alignment stage, and

wherein the biaxial liquid crystal is pre-tilted according to a horizontal electric field in the pre-tilt stage.

2. The liquid crystal display of claim 1, wherein

the first pixel electrode and the second pixel electrode respectively include a first stem and a second stem, and a plurality of first branches and second branches respectively connected to the first stem and the second stem.

3. The liquid crystal display of claim 2, wherein the first branches and the second branches are alternately disposed with respect to each other.

4. The liquid crystal display of claim 3, wherein the first stem and second stem are disposed substantially parallel to the gate line, or the first data line and the second data line, and

the first branches and the second branches are disposed substantially perpendicular to the first stem and the second stem.

5. The liquid crystal display of claim 4, wherein the first pixel electrode and the second pixel electrode respectively further include a first connection and a second connection for connection with the first thin film transistor and the second thin film transistor, respectively.

6. The liquid crystal display of claim 3, wherein the branches are curved at a predetermined angle.

7. The liquid crystal display of claim 1, wherein the first pixel electrode and the second pixel electrode are configured to include a period in which substantially the same voltage is applied thereto and a period in which a different voltage is applied thereto during one frame.

8. The liquid crystal display of claim 1, wherein the biaxial liquid crystal has different refractive indexes and different dielectric ratios in x-, y-, and z-axis directions, and an axis direction having a maximum refractive index and an axial direction having a maximum dielectric ratio are different from each other.

9. The liquid crystal display of claim 1, wherein the biaxial liquid crystal has different refractive indexes and different dielectric ratios in x-, y-, and z-axis directions, and an axis direction having a maximum refractive index and an axial direction having a maximum dielectric ratio are substantially the same.

10. The liquid crystal display of claim 1, wherein the rubbing direction for the biaxial liquid crystal is oblique to the gate line and the first data line and the second data line.

11. The liquid crystal display of claim 10, further comprising:

polarizers attached to the outside surface of the first substrate and the second substrate,

wherein the transmittance directions of the polarizers are oblique to the gate line and the first data line and second data line.