Curved liquid crystal display device

• US 9,964,808 B2
• Filed: 05/15/2015
• Issued: 05/08/2018
• Est. Priority Date: 06/17/2014
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Park, Se-Hong, Chae, Hee-Young, Kong, In-Yeong, Park, Jong-Sin, Pyun, Ja-Young, Lee, Dong-Yoon, Youn, Jae-Woong
• Primary Examiner(s): Raleigh, Donald
• Application Number:
  US14/713,667
• Publication Number:
  US 20150362766A1
• Time in Patent Office: 1,089 Days
• CPC Class Codes: G02F 1/1337 Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
• CPC Class Codes: G02F 1/133738 for homogeneous alignment
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]

Abstract

A curved liquid crystal display device may include first and second substrates having curved surfaces along a first direction; first and second alignment layers on inner surfaces of the first and second substrates, respectively; a liquid crystal layer between the first and second alignment layers; and a seal pattern in an edge area surrounding the liquid crystal layer between the first and second substrates, wherein the first and second alignment layers have an alignment direction substantially parallel with the first direction to orient liquid crystal molecules of the liquid crystal layer.

Claims

1. A curved liquid crystal display (LCD) device, comprising:

first and second substrates having curved surfaces with a curvature along a first direction;

first and second alignment layers on inner surfaces of the first and second substrates, respectively;

a pixel electrode and a common electrode in a pixel region on the first substrate and alternating with each other;

a liquid crystal layer between the first and second alignment layers; and

a seal pattern in an edge area surrounding the liquid crystal layer between the first and second substrates,

wherein the first and second alignment layers have an alignment direction substantially parallel with the curvature along the first direction to orient long axes of the liquid crystal molecules of the liquid crystal layer along the curvature of the first direction,

wherein when a voltage is applied to the pixel electrode and the common electrode and an electric field is generated between the pixel electrode and the common electrode, the long axes of the liquid crystal molecules are arranged according to a direction of the electric field, substantially following the curvature on a surface of the first substrate in the pixel region.

2. The curved LCD device according to claim 1, wherein the liquid crystal molecules have a positive dielectric anisotropy, and when a voltage is applied to the pixel electrode and the common electrode, an electric field is generated in a direction parallel to a second direction that is substantially perpendicular to the first direction or in a direction with an angle less than 45 degrees with respect to the second direction.

3. The curved LCD device according to claim 2, wherein the pixel electrode and the common electrode are inclined with an inclined angle less than 45 degrees with respect to the first direction.

4. The curved LCD device according to claim 3, wherein the inclined angle of the pixel electrode and the common electrode is within a range of 7 to 20 degrees.

5. The curved LCD device according to claim 3, wherein each of the pixel electrode and the common electrode is substantially symmetric with respect to a line passing through a center of the pixel region along the first direction or the second direction.

6. The curved LCD device according to claim 3, wherein the pixel electrode includes first and second pixel electrode portions, each of which includes a plurality of patterns,

wherein the common electrode includes first and second common electrode portions, each of which includes a plurality of patterns, and

wherein the patterns of the first pixel electrode portion alternate with the patterns of the first common electrode portion and the patterns of the second pixel electrode portion alternate with the patterns of the second common electrode portion.

7. The curved LCD device according to claim 6, wherein the common electrode further includes a third common electrode portion that is disposed between the first and second common electrode portions and between adjacent patterns of the first and second pixel electrode portions.

8. The curved LCD device according to claim 7, wherein the third common electrode portion has a substantially triangle shape.

9. The curved LCD device according to claim 6, further comprising a pixel connection portion extended along the second direction and connecting the first and second pixel electrode portions.

10. The curved LCD device according to claim 1, wherein the liquid crystal molecules have a negative dielectric anisotropy, and when a voltage is applied to the pixel electrode and the common electrode, an electric field is generated in a direction parallel to the first direction or in a direction with an angle less than 45 degrees with respect to a second direction that is perpendicular to the first direction.

11. The curved LCD device according to claim 10, wherein each of the pixel electrode and the common electrode is bent in a center of the pixel region with a bent angle less than 45 degrees with respect to the second direction.

12. The curved LCD device according to claim 11, wherein the bent angle of the pixel electrode and the common electrode is within a range of 7 to 20 degrees.

13. The curved LCD device according to claim 11, wherein each of the pixel electrode and the common electrode is substantially symmetric with respect to a line passing through a center of the pixel region along the first direction.