Liquid crystal display device and method of manufacturing same

• US 6,600,543 B1
• Filed: 03/09/2000
• Issued: 07/29/2003
• Est. Priority Date: 05/21/1999
• Status: Expired due to Term

• Current Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Kim, Ki Tae, Jeong, Woo Nam, Kwak, Dong Yeung, Park, Kwang Sup, Lee, Gun Hee
• Primary Examiner(s): Ton, Toan
• Assistant Examiner(s): NGUYEN, DUNG T
• Application Number:
  US09/521,792
• Time in Patent Office: 1,237 Days
• Field of Search: 349/149, 349/42, 349/43, 349/152
• US Class Current: 349/149
• CPC Class Codes: G02F 1/1345 Conductors connecting electrodes to cell terminals
• CPC Class Codes: G02F 1/13452 Conductors connecting driver circuitry and terminals of panels

Abstract

A liquid crystal display (LCD) device has improved adhesion between a tape carrier package and a liquid crystal panel and the LCD device includes an organic insulating layer for increasing the aperture ratio. The LCD includes electrode pads provided on a substrate, semiconductor patterns for preventing etching of the portions of the gate insulating layer that are in contact with the electrode pads, and transparent electrodes for protecting the electrode pads and in contact with the semiconductor patterns. The LCD eliminates the organic protective layer positioned around the pads, thereby strengthening the adhesion between the liquid crystal panel and the TCP.

Claims

1. An LCD (liquid crystal display) having a pad portion for contact with a drive integrated circuit, the LCD comprising:

a substrate;

electrode pads on the substrate;

transparent electrodes on the electrode pads; and

semiconductor layer patterns disposed between the substrate and the transparent electrodes, and in contact with the transparent electrodes, wherein one of the transparent electrodes that is in contact with one of the semiconductor layer patterns covers entirely said one of the semiconductor layer patterns, and an upper surface of said one of the semiconductor layer patterns contacts said one of the transparent electrodes.

2. The LCD according to claim 1, further comprising an anisotropic conductive film disposed on the substrate.

3. The LCD according to claim 1, further comprising a gate insulating layer disposed on the substrate.

4. The LCD according to claim 3, wherein the semiconductor layer patterns are disposed between the gate insulating layer and the transparent electrodes.

5. The LCD according to claim 3, wherein the semiconductor layer patterns are etch preventing layers for preventing an etching of the gate insulating layer that is substantially beneath the semiconductor layer patterns.

6. The LCD of claim 1, wherein the semiconductor layer patterns are made of amorphous silicon.

7. The LCD according to claim 1, wherein said one of the transparent electrodes and said one of the semiconductor layer patterns are part of a gate pad portion, said one of the semiconductor layer patterns having a substantially ring-shaped configuration.

8. The LCD according to claim 7, wherein a second one of the transparent electrodes is in contact with a second one of the semiconductor layer patterns and is part of a data pad portion, and the second one of the semiconductor layer patterns includes a ring-shaped portion which is entirely covered by said second one of the transparent electrodes.

9. The LCD according to claim 1, wherein the semiconductor layer patterns are absent from an area between the transparent electrodes.

10. An LCD (liquid crystal display) With a pad portion for contact with a drive integrated circuit, the LCD comprising:

a substrate;

a pad area on the substrate and including a plurality of electrode pads on the substrate;

a plurality of transparent electrodes on the electrode pads; and

semiconductor layer patterns disposed at the pad area at least partially underneath the electrode pads and in contact with the transparent electrodes, wherein one of the transparent electrodes that is in contact with one of the semiconductor layer patterns covers entirely said one of the semiconductor layer patterns, and an upper surface of said one of the semiconductor layer patterns contacts said one of the transparent electrodes.

11. The LCD according to claim 10, wherein the semiconductor layer patterns are made of amorphous silicon.

12. The LCD according to claim 10, further comprising an anisotropic conductive film disposed on the substrate.

13. The LCD according to claim 10, further comprising a gate insulating layer on the substrate.

14. The LCD according to claim 13, wherein the semiconductor layer patterns are etch preventing layers for arranged to preventing etching of the gate insulating layer patterns that is substantially beneath the semiconductor layer patterns and the electrode pads.

15. The LCD according to claim 10, wherein said one of the transparent electrodes and said one of the semiconductor layer patterns are part of a gate pad portion, said one of the semiconductor layer patterns having a substantially ring-shaped configuration.

16. The LCD according to claim 15, wherein a second one of the transparent electrodes is in contact with a second one of the semiconductor layer patterns and is part of a data pad portion, and the second one of the semiconductor layer patterns includes a ring-shaped portion which is entirely covered by said second one of the transparent electrodes.

17. The LCD according to claim 10, wherein the semiconductor layer patterns are absent from an area between the transparent electrodes.

18. An LCD (liquid crystal display) having a pad portion for contact with a drive integrated circuit, the LCD comprising:

a glass substrate;

a gate insulating layer on the glass substrate;

electrode pads on the glass substrate;

transparent electrodes on the electrode pads and arranged to protect the electrode pads; and

semiconductor layer patterns on the gate insulating layer and arranged to prevent etching of a gate insulating layer that is in contact with the electrode pads, wherein the semiconductor layer patterns are in contact with the transparent electrodes, and one of the transparent electrodes that is in contact with one of the semiconductor layer patterns covers entirely said one of the semiconductor layer patterns and an upper surface of said one of the semiconductor layer patterns. contacts said one of the transparent electrodes.

19. The LCD of claim 18, wherein said one of the semiconductor layer patterns has a substantially ring shaped configuration, and wherein an edge of the corresponding electrode pad is partially overlapped with said one of the semiconductor layer patterns.

20. The LCD of claim 18, wherein the semiconductor layer patterns are amorphous silicon layers.

21. The LCD of claim 20, wherein the amorphous silicon layers are disposed on the gate insulating layer.

22. The LCD of claim 20, wherein said one of the transparent electrodes is disposed on said one of the semiconductor layer patterns and contacts the corresponding electrode pad vias holes provided in the corresponding amorphous silicon layer and the gate insulating layer if said corresponding electrode pad is a gate pad.

23. The LCD of claim 18, wherein a different one of the semiconductor layer patterns is disposed at least partially beneath the corresponding electrode pad if said corresponding electrode pad is a data pad.

24. The LCD of claim 18, wherein said one of the transparent electrodes and said one of the semiconductor layer patterns are part of a gate pad portion, said one of the semiconductor layer patterns having a substantially ring-shaped configuration.

25. The LCD of claim 24, wherein a second one of the transparent electrodes is in contact with a second one of the semiconductor layer patterns and is part of a data pad portion, and the second one of the semiconductor layer patterns includes a ring-shaped portion which is entirely covered by said second one of the transparent electrodes.

26. The LCD according to claim 18, wherein the semiconductor layer patterns are absent from an area between the transparent electrodes.

27. A method for manufacturing an LCD (liquid crystal display) having a pad portion for contact with a drive integrated circuit, the method comprising the steps of:

providing a glass substrate;

forming gate pads on the glass substrate;

overlaying a gate insulating layer on the entire surface of the glass substrate and forming holes exposing the gate pads by patterning the gate insulating layer;

forming data pads on the gate insulating layer;

disposing semiconductor layer patterns on the gate insulating layer to provide first ones of the semiconductor layer patterns at least partially beneath the data pads and to provide second ones of the semiconductor layer patterns at least partially overlapped with the gate pads; and

forming transparent electrodes on the data and gate pads for protecting the data and gate pads, wherein one of the transparent electrodes is in contact with and covers entirely one of the semiconductor layer patterns.

28. The method of claim 27, wherein the step of disposing the semiconductor layer patterns includes forming each of the semiconductor layer patterns to have a substantially ring shaped portion that is arranged to allow an edge of any one of the data and gate pads to be partially overlapped with the corresponding semiconductor layer pattern.

29. The method of claim 27, wherein said one of the transparent electrodes and said one of the semiconductor layer patterns are part of a gate pad portion, said one of the semiconductor layer patterns having a substantially ring-shaped configuration.

30. The method of claim 29, wherein a second one of the transparent electrodes is in contact with a second one of the semiconductor layer patterns and is part of a data pad portion, and the second one of the semiconductor layer patterns includes a ring-shaped portion which is entirely covered by said second one of the transparent electrodes.

31. The method according to claim 27, wherein the semiconductor layer patterns are absent from an area between the transparent electrodes.

32. A method of forming pad portions in a display device for contact with a drive integrated circuit of the display device, the method comprising the steps of:

forming a gate pad portion on a substrate at a peripheral portion of a display panel part of the display device; and

forming a data pad portion on the substrate at the peripheral portion of the display panel part,

wherein the step of forming the gate pad portion includes the steps of,

forming a gate pad on the substrate,

forming sequentially a first gate insulating layer and a first semiconductor layer pattern on the substrate and over portions of the gate pad so as to define a contact hole therethrough, and

covering entirely the first semiconductor layer pattern, the first gate insulating layer and the contact hole with a first transparent electrode layer so that the first transparent electrode layer contacts the first semiconductor layer pattern.

33. The method of claim 32, wherein the step of forming the data pad portion includes the steps of:

forming a second gate insulating layer on the substrate,

forming a second semiconductor layer pattern on the second gate insulating layer,

forming a data pad on the second gate insulating layer and over portions of the second semiconductor layer pattern, and

covering entirely the second semiconductor layer pattern and the data pad with a second transparent electrode layer.

34. The method of claim 33, wherein the first semiconductor layer pattern is in a substantially ring-shaped configuration and the second semiconductor layer pattern includes a substantially ring-shaped portion.

35. The method of claim 34, wherein the second transparent electrode layer is in contact with the second semiconductor layer pattern.

36. The method according to claim 32, wherein the step performing the gate pad portion further includes the steps of:

forming another gate pad on the substrate;

forming another gate insulating layer and another semiconductor layer pattern over portions of said another gate pad so as to define another contact hole therethrough; and

covering entirely said another semiconductor layer pattern, said another gate insulating layer and said another contact hole with another transparent electrode layer so that said another transparent electrode layer contacts said another semiconductor layer pattern,

wherein said semiconductor layer patterns and said gate insulating layers are absent from an area between said first transparent electrode and said another transparent electrode.