Liquid crystal display device and fabrication method thereof

• US 7,362,396 B2
• Filed: 03/27/2007
• Issued: 04/22/2008
• Est. Priority Date: 12/23/2003
• Status: Expired due to Fees

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Kim, Sang Ho, Jeoung, Hun
• Primary Examiner(s): QI, ZHI QIANG
• Application Number:
  US11/729,093
• Publication Number:
  US 20070242194A1
• Time in Patent Office: 392 Days
• Field of Search: 349110-111, 349/106, 349/44
• US Class Current: 349/110
• CPC Class Codes: G02F 1/133334 Electromagnetic shields
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133519 Overcoatings

Abstract

A liquid crystal display device includes a liquid crystal layer interposed between opposing substrates. One of the substrates includes a conductive black matrix layer formed within a display region and formed in non-display region of the device. A black matrix island formed at the same time as the black matrix layer is isolated from the black matrix layer in the non-display region. A color filter layer of red, green and blue color filters is formed in the display region. A common electrode is formed on the black matrix layer and on the black matrix island. The common electrode formed on the black matrix island is insulated from the black matrix island by an insulator. Silver dots in the non-display region are respectively connected with the black matrix layer and the common electrode on the black matrix island.

Claims

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

first and second substrates; and

a liquid crystal layer interposed between the first and second substrates,

wherein the second substrate comprises;

a black matrix layer formed on an active region and a periphery of the active region;

a black matrix island spaced from the black matrix layer;

a color filter layer of red, green and blue color filters formed on the active region;

an overcoat layer formed on the black matrix layer and the black matrix island;

a common electrode formed on the overcoat layer; and

a first conducting material connected with the black matrix layer and a second conducting material connected with the common electrode on the black matrix island.

2. The LCD according to claim 1, wherein the first or second conducting material comprises silver.

3. The LCD according to claim 1, wherein the black matrix island is formed on a non-active region.

4. The LCD according to claim 1, wherein the black matrix layer comprises a conductive black resin.

5. The LCD according to claim 1, wherein the overcoat layer comprises an insulating material.

6. The LCD according to claim 1, further comprising a common electrode material formed between the first conducting material and the black matrix layer.

7. The LCD according to claim 1, wherein the second conducting material is electrically in contact with the common electrode formed on the black matrix island.

8. The LCD according to claim 1, wherein the overcoat layer terminates before extending to a portion of the black matrix layer contacted by the first conducting material.

9. A method for fabricating a liquid crystal display (LCD), the method comprising:

forming a black matrix layer and a black matrix island separated from the black matrix layer on a substrate;

forming a color filter layer on the black matrix layer;

forming an overcoat layer on the color filter layer and the black matrix island;

forming a common electrode on the overcoat layer; and

forming a first conducting material connected with the black matrix layer and a second conducting material connected with the common electrode on the black matrix island.

10. The method according to claim 9, wherein the first or second conducting material comprises silver.

11. The method according to claim 9, wherein the second conducting material is electrically in contact with the common electrode formed on the black matrix island.

12. The method according to claim 9, wherein the color filter layer and the overcoat layer terminate before extending to a portion of the black matrix layer contacted by the first conducting material.

13. The method according to claim 9, further comprising a common electrode material formed between the first conducting material and the black matrix layer.

14. A substrate for a display, the substrate comprising:

a conductive light blocking layer having a first section disposed in an active region of the display and a second section disposed in an inactive region of the display, the first and second sections electrically insulated from each other;

a color filter layer disposed on the first section of the light blocking layer;

an electrode having a first portion disposed on the color filter layer in the active region and a second portion disposed on the second section of the light blocking layer; and

a first conductor electrically contacting the first section of the light blocking layer and a second conductor electrically contacting the second portion of the electrode.

15. The display according to claim 14, wherein the first section of the light blocking layer on which the first conductor is disposed in the inactive region of the display.

16. The display according to claim 15, wherein the first section of the light blocking layer on which the first conductor is disposed is adjacent to the inactive region of the display on which the second section of the light blocking layer is disposed.

17. The display according to claim 14, wherein the first and second conductors are electrically insulated from each other.

18. The display according to claim 14, further comprising an insulator disposed between the second portion of the electrode and the second section of the light blocking layer.

19. The display according to claim 18, wherein the insulator comprises the color filter layer.

20. The display according to claim 19, further comprising an insulating layer disposed between the first portion of the electrode and the color filter layer.

21. The display according to claim 18, wherein the insulator comprises a layer different from the color filter layer.

22. The display according to claim 21, wherein the layer is also disposed between the first portion of the electrode and the color filter layer.

23. The display according to claim 14, further comprising a liquid electrically isolating the first and second sections of the light blocking layer.

24. The display according to claim 23, further comprising a solid electrically isolating the first and second sections of the light blocking layer.

25. The display according to claim 14, wherein the color filter layer is disposed between the first and second sections of the light blocking layer.

26. The display according to claim 14, wherein the first conductor physically contacts the first section of the light blocking layer.

27. The display according to claim 14, wherein the second conductor physically contacts the second portion of the electrode.

28. The display according to claim 14, wherein the first and second conductors extend further from the substrate than the electrode.

29. The display according to claim 14, wherein the first and second conductors have a thickness larger than a thickness of any layer on which the first and second conductors are disposed.

30. A method of reducing electromagnetic radiation between first and second substrates of a display, the method comprising:

providing a first electrical contact between a conductive light blocking layer on the first substrate and a ground connector on the second substrate; and

providing a second electrical contact between a first electrode on the first substrate and a second electrode on the second substrate, the first and second electrical contacts electrically insulated from each other.

31. The method according to claim 30, further comprising:

forming the first electrical contact on the conductive light blocking layer on the first substrate and the second electrical contact on the first electrode; and

arranging the first and second substrates such that the first and second electrical contacts are disposed in an inactive region of the display.

32. The method according to claim 30, further comprising providing an insulating layer between the second electrical contact and a portion of the conductive light blocking layer on which the second electrical contact is disposed and between the first electrode and the conductive light blocking layer.

33. The method according to claim 32, wherein the insulating layer comprises a color filter layer.

34. The method according to claim 32, wherein the insulating layer comprises an overcoat layer.

35. A liquid crystal display (LCD) comprising:

an array substrate containing a first electrode and a ground connector;

a color filter substrate containing an electromagnetic shield layer, a color filter, and a second electrode;

a liquid crystal layer disposed between the array substrate and the color filter substrate; and

a first electrical contact between the electromagnetic shield layer and the ground conductor and a second electrical contact between the first and second electrodes, the first and second electrical contacts insulated from each other,

wherein the second electrode is disposed between the color filter and the liquid crystal layer.

36. The display according to claim 35, wherein the electromagnetic shield layer is disposed between the color filter substrate and the color filter layer.

37. The display according to claim 35, wherein the electromagnetic shield layer serves as a light blocking layer.

38. The display according to claim 35, wherein the electromagnetic shield layer is disposed between the second electrical contact and the color filter substrate.

39. The display according to claim 38, wherein the color filter layer insulates the second electrical contact from the electromagnetic shield layer.

40. The display according to claim 38, further comprising an overcoat layer that insulates the second electrical contact from the electromagnetic shield layer.

41. The display according to claim 40, wherein the overcoat layer is disposed between the color filter layer and the second electrode.

42. The display according to claim 35, further comprising an overcoat layer disposed between the color filter layer and the second electrode.