Active matrix LCD having a non-conductive light shield layer

• US 5,781,254 A
• Filed: 07/03/1997
• Issued: 07/14/1998
• Est. Priority Date: 08/29/1995
• Status: Expired due to Term

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Hong, Chan Hee, Kim, Jeong Hyun
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): TON, MINH TOAN T
• Application Number:
  US08/886,283
• Time in Patent Office: 376 Days
• Field of Search: 359/59, 359/67, 359/54, 349/42, 349/43, 349/44, 349/110, 349/143, 349/111
• US Class Current: 349/44
• CPC Class Codes: G02F 1/136209 Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line

Abstract

A liquid crystal display having a top plate and a bottom plate. The bottom plate includes a plurality of gate bus lines and a plurality of drain bus line arranged in a matrix on a substrate surface. A plurality of thin film transistors, each including a source, gate and drain, are formed at intersections of the gate and drain bus lines. A black matrix pattern, including a non-conductive black resin, is provided on the gate bus lines, the drain bus lines and the thin film transistors for shielding these elements from light generated by back lighting the display. A protective layer is formed on the black matrix pattern having contact holes for coupling the pixel electrodes to corresponding drain electrodes of the thin film transistors.

Claims

1. A liquid crystal display device comprising:

a substrate having a primary surface;

a plurality of gate bus lines and a plurality of data bus lines disposed in a matrix arrangement on said primary surface of said substrate;

a plurality of thin film transistors formed on said primary surface of said substrate, each having a gate electrode, a source electrode, and a drain electrode, said plurality of thin film transistors being respectively provided at intersections of said gate bus lines and said data bus lines;

a opaque non-conductive layer formed on said plurality of gate bus lines and said plurality of data bus lines, said non-conductive opaque layer shielding said plurality of gate bus lines and said plurality of data bus lines from light;

a protective layer formed on said opaque non-conductive layer and having a plurality of contact holes provided in correspondence with said drain electrode of each of said plurality of thin film transistors; and

a plurality of pixel electrodes formed on said primary surface of said substrate and coupled to corresponding ones of said drain electrodes via said plurality of contact holes.

2. A liquid crystal display device in accordance with claim 1, wherein said opaque non-conductive layer constitutes a black matrix pattern.

3. A liquid crystal display device in accordance with claim 1, wherein said opaque non-conductive layer covers portions of said primary surface of said substrate except portions of said primary surface of said substrate corresponding to said plurality of pixel electrodes.

4. A liquid crystal display device in accordance with claim 1, wherein said opaque non-conductive layer covers regions on said primary surface of said substrate except regions corresponding to said plurality of pixel electrodes.

5. A liquid crystal display device in accordance with claim 1, wherein said opaque non-conductive layer covers regions on said primary surface of said substrate corresponding to first portions of said plurality of pixel electrodes and exposes regions on said primary surface of said substrate corresponding to second portions of said plurality of pixel electrodes.

6. A liquid crystal display device in accordance with claim 1, wherein said gate electrode of each of said plurality of thin film transistors is formed on said substrate, each of said plurality of thin film transistors further comprising:

an insulating layer formed on said gate electrode;

a semiconductor layer formed on said insulating layer;

an ohmic contact layer formed on said semiconductor layer, wherein said source electrode and said drain electrode of each of said plurality of thin film transistors is provided on said semiconductor layer.

7. A liquid crystal display device in accordance with claim 1, wherein said opaque non-conductive layer includes an organic black resin.

8. A liquid crystal display device in accordance with claim 6, wherein said opaque non-conductive layer has a width greater than a width of each of said plurality of data bus lines.

9. A liquid crystal display device in accordance with claim 6, wherein said opaque non-conductive layer has a thickness of 1.5 microns and is substantially heat resistant to a temperature from 0°

C. to about 260°

C.

10. A liquid crystal display device in accordance with claim 6, wherein each of said thin film transistors further comprises a channel region provided between said source electrode and said drain electrode, a portion of said opaque non-conductive layer being removed adjacent said channel region of each of said thin film transistors.

11. A liquid crystal display device in accordance with claim 1, wherein each of said thin film transistors further comprises a channel region provided between said source electrode and said drain electrode, said liquid crystal display device further comprising an inorganic insulating layer provided overlying said channel region.

12. A liquid crystal display device in accordance with claim 1, wherein said protecting layer is formed on said opaque non-conductive layer and includes at least one inorganic insulating layer.

13. A liquid crystal display device in accordance with claim 1, wherein said opaque non-conductive layer covers regions on said primary surface of said substrate other than regions corresponding to said plurality of pixel electrodes and said plurality of thin film transistors.