LCD having contact electrode coupling gate electrode of first pixel to region active layer of second pixel region

• US 6,067,132 A
• Filed: 08/26/1997
• Issued: 05/23/2000
• Est. Priority Date: 08/31/1996
• Status: Expired due to Term

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Hong-Gyu
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): TON, MINH TOAN T
• Application Number:
  US08/917,382
• Time in Patent Office: 1,001 Days
• Field of Search: 349/48, 349/43, 349/38, 349/47, 257/59, 257/72
• US Class Current: 349/47
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/1255 integrated with passive devices, e.g. auxiliary capacitors

Abstract

Disclosed are a liquid crystal display device and a method for fabricating the same in which a storage capacitor has a transparent structure formed of an active layer, a gate insulating film, and a pixel electrode so that aperture can be improved. Since metal material having very low resistance is used as gate lines, the resistance of the gate lines is significantly reduced, thereby fabricating the liquid crystal display device having high density and high definition.

Claims

1. A liquid crystal display device having a plurality of matrix shaped pixel regions approximately defined by a plurality of gate lines and data lines, comprising:

a first active layer coupled to a first pixel electrode in a first pixel region on a substrate;

a second active layer in a second pixel region of the substrate, wherein said first and second pixel regions are on opposite sides of one of said gate lines;

a gate electrode electrically coupled to said first active layer and said one of the gate lines; and

a contact electrode for electrically coupling said gate electrode to said second active layer.

2. The device as claimed in claim 1, wherein said contact electrode is disposed below said one of the gate lines.

3. The device as claimed in claim 1, wherein said first active layer is in a first region on the substrate and includes a source region and a drain region and said second active layer is in a second region on the substrate.

4. The device as claimed in claim 3, wherein said gate electrode is formed between the source region and the drain region of said first active layer.

5. The device as claimed in claim 3, wherein said first pixel electrode contacts the drain region of said first active layer.

6. The device as claimed in claim 3, wherein said first region comprises a thin film transistor region and said second region comprises a storage capacitor region.

7. The device as claimed in claim 1, wherein said gate electrode and said one of the plurality of gate lines comprise different materials.

8. The device as claimed in claim 1, wherein said gate electrode comprises polysilicon and said one of the plurality of gate lines comprises metal.

9. The device as claimed in claim 1, wherein said plurality of gate lines and data lines are approximately perpendicular to each other and define approximately rectangular pixel regions.

10. The device as claimed in claim 1, wherein said plurality of gate lines and data lines are approximately perpendicular to each other and define approximately square pixel regions.

15. The device as claimed in claim 1, wherein the contact electrode overlaps said one of the gate lines.

11. A liquid crystal display device having a plurality of matrix shaped pixel regions, and a plurality of gate lines and data lines between the pixel regions, the device comprising:

a first active layer having source and drain regions in a first region on a substrate;

a second active layer in a second region on the substrate;

a gate electrode formed between the source region and drain regions of the first active layer in contact with one of said plurality of gate lines;

a first pixel electrode formed in the pixel regions in contact with the drain region of the first active layer; and

a contact electrode formed to be connected with the gate electrode in contact with the second active layer.

12. The device as claimed in claim 11, wherein the first region comprises a thin film transistor region and the second region comprises a storage capacitor region.

13. The device as claimed in claim 11, wherein the gate electrode and the gate line comprise different materials from each other.

14. The device as claimed in claim 11, wherein the contact electrode is disposed below said one of the gate lines.

16. A liquid crystal display device having a plurality of matrix shaped pixel regions, and gate lines and data lines perpendicular to each other between the pixel regions, the device comprising:

a first active layer having source and drain regions in a first region on a substrate;

a second active layer in a second region on the substrate;

a gate electrode formed between the source and drain regions of the first active layer in contact with gate lines;

a first pixel electrode formed in the pixel regions in contact with the drain region of the first active layer; and

a contact electrode formed in a data line region in contact with the second active layer.

17. The device as claimed in claim 16, wherein the first region is a thin film transistor region and the second region is a storage capacitor region.

18. The device as claimed in claim 16, wherein the contact electrode overlaps the data lines and is formed in the same direction as the data line.

19. The device as claimed in claim 16, wherein the contact electrode is disposed below the data line.

20. The liquid crystal display device as claimed in claim 16, wherein the gate electrode and the gate line are formed of different material from each other.