In-plane switching mode liquid crystal display device

• US 20060055859A1
• Filed: 06/28/2005
• Published: 03/16/2006
• Est. Priority Date: 09/13/2004
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Jin, Hyun Suk, Ryu, Ho Jin
• Granted Patent: US 7,483,087 B2
• Time in Patent Office: Days
• US Class Current: 349/141
• CPC Class Codes: G02F 1/133382 Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]

Abstract

An in-plane switching (IPS) mode liquid crystal display (LCD) device is disclosed which includes a heater line to achieve an improvement in reliability under low temperature conditions. The LCD device includes a first substrate and a second substrate which face each other, a gate line and a data line which are formed on the first substrate such that the gate line and the data line cross each other to define a pixel region, a common electrode and a pixel electrode which are formed on the first substrate in the pixel region, a heater line formed on the first substrate such that the heater line corresponds to the common electrode adjacent to one side of the data line, and a liquid crystal layer formed between the first substrate and the second substrate.

Claims

1. An in-plane switching mode liquid crystal display device comprising:

a first substrate and a second substrate which face each other;

a gate line and a data line which are formed on the first substrate such that the gate line and the data line cross each other to define a pixel region;

a first common electrode and a pixel electrode which are formed on the first substrate in the pixel region;

a heater line formed on the first substrate beneath the first common electrode and adjacent to the data line; and

a liquid crystal layer formed between the first substrate and the second substrate.

2. The in-plane switching mode liquid crystal display device according to claim 1, wherein the first common electrode is formed on a layer on which the pixel electrode is formed, each of the first common electrode and the pixel electrode has portions alternately arranged with portions of the other one of the first common electrode and the pixel electrode, and the heater line is substantially parallel to one portion of the first common electrode.

3. The in-plane switching mode liquid crystal display device according to claim 1, wherein the first common electrode is formed on a layer on which the gate line is formed.

4. The in-plane switching mode liquid crystal display device according to claim 1, further comprising:

a second common electrode formed on the first substrate beneath the heater line.

5. The in-plane switching mode liquid crystal display device according to claim 4, wherein the first common electrode is formed on a layer on which the pixel electrode is formed, and the second common electrode is formed on a layer on which the gate line is formed.

6. The in-plane switching mode liquid crystal display device according to claim 5, wherein the first common electrode is made from a transparent electrode material, and the second common electrode is made from a light-shielding metal.

7. The in-plane switching mode liquid crystal display device according to claim 1, wherein the first common electrode has a first width larger than a second width of the heater line.

8. The in-plane switching mode liquid crystal display device according to claim 1, wherein a high voltage approximately equal to or greater than a drive voltage is applied to the heater line.

9. The in-plane switching mode liquid crystal display device according to claim 8, wherein the high voltage is between approximately 30 volts and approximately 100 volts.

10. The in-plane switching mode liquid crystal display device according to claim 8, wherein the application of the high voltage is carried out after a low temperature approximately equal to or below a predetermined value is sensed by a temperature sensor disposed on the first substrate or the second substrate.

11. The in-plane switching mode liquid crystal display device according to claim 1, wherein the heater line is made from a light-shielding metal.

12. The in-plane switching mode liquid crystal display device according to claim 1, wherein the pixel electrode and the first common electrode extend substantially parallel to the data line.

13. An in-plane switching mode liquid crystal display device comprising:

a first substrate and a second substrate which face each other;

a gate line and a data line which are formed on the first substrate such that the gate line and the data line cross each other to define a pixel region;

a common electrode and a pixel electrode which are formed on the first substrate in the pixel region;

a heater line formed on the first substrate such that the heater line corresponds to the common electrode and is adjacent to the data line; and

a liquid crystal layer formed between the first substrate and the second substrate.

14. The in-plane switching mode liquid crystal display device according to claim 13, wherein the heater line is made from a light-shielding metal and each of the common electrode and the pixel electrode has portions alternately arranged with portions of the other one of the common electrode and the pixel electrode.

15. The in-plane switching mode liquid crystal display device according to claim 13, wherein the heater line is arranged beneath the common electrode.

16. The in-plane switching mode liquid crystal display device according to claim 15, wherein the common electrode has a first width larger than a second width of the heater line.

17. The in-plane switching mode liquid crystal display device according to claim 13, wherein the heater line is arranged above the common electrode.

18. The in-plane switching mode liquid crystal display device according to claim 13, wherein the common electrode is formed on a layer on which the gate line is formed.

19. The in-plane switching mode liquid crystal display device according to claim 13, wherein the common electrode is made from a light-shielding metal, and the pixel electrode is made from a transparent electrode material.

20. The in-plane switching mode liquid crystal display device according to claim 13, wherein a high voltage approximately equal to or greater than a drive voltage is applied to the heater line.

21. The in-plane switching mode liquid crystal display device according to claim 20, wherein the high voltage is between approximately 30 volts and approximately 100 volts.

22. The in-plane switching mode liquid crystal display device according to claim 20, wherein the application of the high voltage is carried out after a low temperature approximately equal to or below a predetermined value is sensed by a temperature sensor disposed on the first substrate or the second substrate.

23. The in-plane switching mode liquid crystal display device according to claim 13, wherein the pixel electrode and the common electrode extend substantially parallel to the data line.

24. A method for fabricating a liquid crystal display device, comprising:

fabricating a gate line and a data line on a first substrate such that the gate line and the data line cross each other to define a pixel region;

fabricating a first common electrode and a pixel electrode on the first substrate in the pixel region, the first common electrode having a first common electrode portion adjacent to the data line;

fabricating a heater line on the first substrate that substantially parallels the first common electrode portion.

25. The method of claim 24, comprising fabricating a liquid crystal layer, wherein the liquid crystal layer is disposed between the first substrate and a second substrate.

26. The method of claim 25, wherein the heater line is disposed beneath the first common electrode portion such that the first common electrode portion substantially covers the heater line.

27. The method of claim 26, comprising fabricating a second common electrode on the first substrate, wherein the second common electrode substantially parallels the heater line, the heater line being disposed between the first and second common electrodes.

28. The method of claim 26, wherein the heater line is made from a light-shielding metal.

29. The method of claim 26, wherein the first common electrode is made from a light-shielding metal, and the pixel electrode is made from a transparent electrode material.

30. The method of claim 25, comprising fabricating the first common electrode and the pixel electrode on the same layer.

31. The method of claim 25, comprising fabricating the the first common electrode, the pixel electrode, and the heater line on different layers.