Thin film transistor substrate for liquid crystal display

• US 20080002083A1
• Filed: 12/22/2006
• Published: 01/03/2008
• Est. Priority Date: 06/30/2006
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kwon, Jae Chang, Lee, Sun Yong, Lee, Se Eung
• Granted Patent: US 7,768,588 B2
• Time in Patent Office: Days
• US Class Current: 349/43
• 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 2201/40 Arrangements for improving the aperture ratio
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements

Abstract

A thin film transistor (TFT) substrate for a liquid crystal display is provided. The thin film transistor substrate includes: a plurality of gate lines and a plurality of data lines that cross each other and define a plurality of sub-pixels; and a plurality of unit pixels in which first and second unit pixels are alternately formed in a direction of the gate lines and first and second unit pixels are formed vertically in a direction of the data lines, wherein the first unit pixel includes three sub-pixels and the first electrodes are slanted with respect to the gate lines and the data lines in each sub-pixel, the second unit pixel includes three sub-pixels and the second electrodes are a slanted with respect to the gate lines and the data lines in each sub-pixel, and the slant of the second electrodes is symmetrical to the slant of the first electrodes.

Claims

1. A thin film transistor (TFT) substrate for a liquid crystal display, comprising:

a plurality of gate lines and a plurality of data lines that cross each other and define a plurality of sub-pixels; and

a plurality of unit pixels in which first and second unit pixels are alternately formed in a direction of the gate lines and first and second unit pixels are formed vertically in a direction of the data lines,

wherein the first unit pixel includes three sub-pixels and the first electrodes are slanted with respect to the gate lines and the data lines in each sub-pixel,

the second unit pixel includes three sub-pixels and the second electrodes are a slanted with respect to the gate lines and the data lines in each sub-pixel, and

the slant of the second electrodes is symmetrical to the slant of the first electrodes.

2. The substrate of claim 1, wherein the first and second electrodes are first and second pixel electrodes.

3. The substrate of claim 2, wherein the three sub-pixels of the first unit pixel includes a first common electrode parallel to the first pixel electrode and that forms an in-plane field together with the first pixel electrode.

4. The substrate of claim 3, wherein the three sub-pixels of the second unit pixel includes a second common electrode parallel to the second pixel electrode and that forms an in-plane field together with the second pixel electrode.

5. The substrate of claim 4, further comprising:

a liquid crystal layer formed in each of the three sub-pixels of the first unit pixel and in each of the three sub-pixels of the second unit pixel.

6. The substrate of claim 5, wherein liquid crystal molecules of the liquid crystal of each of the three sub-pixels of the first unit pixel rotate in the same direction due to a first in-plane field, liquid crystal molecules of the liquid crystal of each of the three sub-pixels of the second unit pixel rotate in the same direction due to a second in-plane field, and the rotational direction of the liquid crystal molecules of the liquid crystal of each of the three sub-pixels of the second unit pixel is the opposite to that of the liquid crystal molecules of the liquid crystal of each of the three sub-pixels of the first unit pixel.

7. The substrate of claim 1, wherein the first electrodes adjacent vertically along the gate lines have the same slant with respect to the gate lines.

8. The substrate of claim 7, wherein the second electrodes adjacent vertically along the gate lines have the same slant with respect to the gate lines.

9. The substrate of claim 1, wherein the first electrodes adjacent vertically along the gate lines have a slant symmetrical about the gate lines.

10. The substrate of claim 9, wherein the second electrodes adjacent vertically along the gate lines have a slant symmetrical about the gate lines.

11. The substrate of claim 1, wherein the three sub-pixels of the first and second unit pixels are located in the same order.

12. The substrate of claim 1, wherein the three sub-pixels of the first and second unit pixels are located in a symmetrical order to each other.

13. The substrate of claim 1, wherein the three sub-pixels of the first and second unit pixels include red, green, and blue sub-pixels.

14. A liquid crystal display (LCD) comprising:

a TFT substrate having first and second unit pixels that are alternately located in a direction along gate lines and also located vertically in a direction along data lines, the first and second unit pixels in a matrix;

a color filter substrate that faces the TFT substrate;

a liquid crystal layer between the TFT substrate and the color filter substrate,

wherein the first unit pixel includes three sub-pixels and first electrodes slant with respect to the gate lines and the data lines in each sub-pixel,

the second unit pixel includes three sub-pixels and second electrodes slant with respect to the gate lines and the data lines in each sub-pixel, and

the slant of the second electrodes is symmetrical to the slant of the first electrodes.

15. The LCD of claim 14, wherein the first and second electrodes are first and second pixel electrodes.

16. The LCD of claim 15, wherein the three sub-pixels of the first unit pixel includes a first common electrode parallel to the first pixel electrode and that forms an in-plane field together with the first pixel electrode.

17. The LCD of claim 16, wherein the three sub-pixels of the second unit pixel includes a second common electrode parallel to the second pixel electrode and that forms an in-plane field together with the second pixel electrode.

18. The LCD of claim 14, wherein the first electrodes adjacent up and down based on the gate line are formed in the same slant line direction with respect to the gate line.

19. The LCD of claim 18, wherein the second electrodes adjacent vertically along the gate lines have the same slant with respect to the gate lines.

20. The LCD of claim 14, wherein the first electrodes adjacent vertically along the gate lines have a slant symmetrical about the gate lines.

21. The LCD of claim 20, wherein the second electrodes adjacent vertically along the gate lines have a slant symmetrical about the gate lines.

22. The LCD of claim 14, wherein the three sub-pixels of the first and second unit pixels are located in the same order.

23. The LCD of claim 14, wherein the three sub-pixels of the first and second unit pixels are located in a symmetrical order to each other.

24. The substrate of claim 14, wherein the three sub-pixels of the first and second unit pixels include red, green, and blue sub-pixels.