IP Library › Granted Patent US 10,162,231
Granted Patent B2
US 10,162,231 · App. 15/376,332 · Granted Dec 25, 2018

Liquid crystal display device

Inventor: Du-Hwan Park (Ulsan, KR)
Assignee: LG Display Co., Ltd.
G02F1/134363
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Quick Facts
Patent No.
US 10,162,231
App. No.
15/376,332
Granted
Dec 25, 2018
Kind
B2
Abstract

Provided is a liquid crystal display device. The liquid crystal display device includes: a first pixel electrode of which at least a part is extended in a first direction; and a second pixel electrode of which at least a part is extended in a second direction different from the first direction. The first pixel electrode and the second pixel electrode are included in the same pixel and respectively disposed in different sub-pixels. According to the present disclosure, pixel electrodes having different tilt angles are used in sub-pixels, respectively. Thus, it is possible to minimize a difference in response speed between sub-pixels when various colors are displayed.

Claims (36)

1. A liquid crystal display device comprising:

a first pixel electrode of which at least a part is extended in a first direction;

a second pixel electrode of which at least a part is extended in a second direction different from the first direction;

a red color filter on the first pixel electrode; and

a green color filter or a blue color filter on the second pixel electrode,

wherein the first pixel electrode and the second pixel electrode are included in a same pixel and respectively disposed in different sub-pixels,

the first pixel electrode and the second pixel electrode have a same size, and

a width of the second pixel electrode is greater than a width of the first pixel electrode.

2. The liquid crystal display device according to claim 1 , wherein the first pixel electrode includes a first sub-electrode extended in the first direction and a second sub-electrode extended in a direction symmetrical to the first direction on a basis of an axis, and

the second pixel electrode includes a third sub-electrode extended in the second direction and a fourth sub-electrode extended in a direction symmetrical to the second direction on the basis of the axis.

3. The liquid crystal display device according to claim 2 , wherein each of the first pixel electrode and the second pixel electrode further includes a ←shaped connection sub-electrode that connects the first sub-electrode and the second sub-electrode and connects the third sub-electrode and fourth sub-electrode, and

wherein the connection sub-electrodes of the first pixel electrode and the second pixel electrode have a same shape.

4. The liquid crystal display device according to claim 1 , wherein a difference in angle between the first direction and the second direction is between 3 degrees and 7 degrees.

5. The liquid crystal display device according to claim 1 , wherein a tilt angle of the first pixel electrode is smaller than a tilt angle of the second pixel electrode.

6. The liquid crystal display device according to claim 1 , further comprising:

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

a second thin film transistor electrically connected to the second pixel electrode,

wherein a portion where the first pixel electrode is connected to the first thin film transistor and a portion where the second pixel electrode is connected to the second thin film transistor have a same structure.

7. The liquid crystal display device according to claim 1 , further comprising:

a liquid crystal layer on the first pixel electrode and the second pixel electrode and including a plurality of liquid crystals,

wherein when voltages for displaying gray scales other than gray color are respectively applied to the first pixel electrode and the second pixel electrode, a difference in rotation times between liquid crystals on the first pixel electrode and liquid crystals on the second pixel electrode is 8 μs or less at a specific color gray scale.

8. The liquid crystal display device according to claim 7 , wherein the difference in rotation times between the liquid crystals on the first pixel electrode and the liquid crystals on the second pixel electrode is 8 μs or less at all gray scales.

9. The liquid crystal display device according to claim 7 , wherein the liquid crystals are negative liquid crystals or positive liquid crystals.

10. A liquid crystal display device comprising:

a first pixel electrode including a first sub-electrode extended and tilted at a first angle on a basis of a direction orthogonal to a gate line and a second sub-electrode extended in a direction symmetrical to an extension direction of the first sub-electrode on a basis of a direction parallel with the gate line;

a second pixel electrode including a third sub-electrode extended and tilted at a second angle on the basis of the direction orthogonal to the gate line and a fourth sub-electrode extended in a direction symmetrical to an extension direction of the third sub-electrode on the basis of the direction parallel with the gate line, the first pixel electrode and the second pixel electrode having a same size, and a width of the second pixel electrode greater than a width of the first pixel electrode; and

a red color filter on the first pixel electrode and a green color filter or a blue color filter on the second pixel electrode, and

wherein the second angle is greater than the first angle.

11. The liquid crystal display device according to claim 10 , wherein a difference between the first angle and the second angle is between 3 degrees and 7 degrees.

12. The liquid crystal display device according to claim 10 , wherein each of the first pixel electrode and the second pixel electrode further includes a ←shaped connection sub-electrode that connects the first sub-electrode and the second sub-electrode and connects the third sub-electrode and fourth sub-electrode, and

wherein the connection sub-electrode is tilted at a third angle on the basis of the direction orthogonal to the gate line, and

the third angle is greater than the first angle and the second angle.

13. The liquid crystal display device according to claim 10 , wherein the first pixel electrode and the second pixel electrode are included in a same pixel and respectively disposed in different sub-pixels, and

the first angle and the second angle determined in order for at least some of the sub-pixels to respectively have different liquid crystal rotation times when a same voltage is applied.

14. The liquid crystal display device according to claim 10 , wherein a width of the first pixel electrode and a width of the second pixel electrode are adjusted such that the first pixel electrode and the second pixel electrode have a same size, when a first direction of the first pixel electrode and a second direction of the second pixel electrode change.

15. The liquid crystal display device according to claim 10 , wherein that the first pixel electrode and the second pixel electrode have a same size such that parasitic capacitance Cdp and transistor charging characteristics are kept uniform between sub-pixels, when a first direction of the first pixel electrode and a second direction of the second pixel electrode change.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 13, 2016
From: PARK, DU-HWAN
To: LG DISPLAY CO., LTD.
Reel/Frame 040727/0770 →
Priority Claims (1)
KR 10-2015-0182125 · Dec 18, 2015 · national
Continuity (1)
Related Publication 20170176819A1 · Jun 22, 2017