Liquid crystal display panel and method of fabricating the same

• US 20060139556A1
• Filed: 06/29/2005
• Published: 06/29/2006
• Est. Priority Date: 12/23/2004
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Ahn, Byung Chul, Lim, Joo Soo
• Granted Patent: US 7,528,921 B2
• Time in Patent Office: Days
• US Class Current: 349/153
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G02F 1/1343 Electrodes reflective electrodes G02F1/133553
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence

Abstract

This invention relates to a liquid crystal display panel, including: a first substrate having a common electrode; a second substrate including a pixel electrode that forms an electric field with the common electrode, a thin film transistor connected to the pixel electrode, a signal line that applies a signal to the thin film transistor, and a contact area in an area outside an area where the signal line is, and the contact area applies a common voltage to the common electrode; and a sealant formed between the first and second substrates with a conductive spacer that connects the contact area with the common electrode.

Claims

1. A liquid crystal display panel, comprising:

a first substrate having a common electrode;

a second substrate including a pixel electrode that forms an electric field with the common electrode, a thin film transistor connected to the pixel electrode, a signal line that applies a signal to the thin film transistor, and a contact area in an area outside an area where the signal line is, and the contact area applies a common voltage to the common electrode; and

a sealant between the first and second substrates with a conductive spacer that connects the contact area with the common electrode.

2. The liquid crystal display panel according to claim 1, wherein the conductive spacer is formed of one of a conductive glass fiber and a conductive ball.

3. The liquid crystal display panel according to claim 1, further comprising a second sealant formed between the first and second substrates in an area where the signal line is.

4. The liquid crystal display panel according to claim 3, wherein the second sealant includes a non-conductive spacer.

5. The liquid crystal display panel according to claim 4, wherein the non-conductive spacer is formed of one of a glass fiber and a ball spacer.

6. The liquid crystal display panel according to claim 1, wherein the contact area includes:

a first common pattern along at least three sides of the substrate;

an insulating film having at least one common contact hole that exposes the first common pattern; and

a second common pattern connected to the first common pattern through the common contact hole and connected to the conductive spacer.

7. The liquid crystal display panel according to claim 6, wherein the second common pattern is along at least three sides of the substrate and along the first common pattern.

8. The liquid crystal display panel according to claim 6, wherein the signal line includes:

a gate line to apply a gate signal to the thin film transistor; and

a data line to apply a data signal to the thin film transistor.

9. The liquid crystal display panel according to claim 8, wherein the second common pattern is in parallel to one of the data line and the gate line.

10. The liquid crystal display panel according to claim 6, wherein the second common pattern is in an area corresponding to a liquid crystal injection hole.

11. The liquid crystal display panel according to claim 6, wherein the second common pattern is in a corner area of the second substrate.

12. The liquid crystal display panel according to claim 6, further comprising a common pad formed at both sides of the second substrate to be connected to both sides of the first and second common pattern.

13. The liquid crystal display panel according to claim 6, wherein the first common pattern is formed of the same metal as a gate electrode of the thin film transistor, and the second common pattern is formed of the same material as the pixel electrode.

14. The liquid crystal display panel according to claim 6, wherein the contact part further includes third and fourth common patterns that are close to the second common pattern in an area sealed by the first and second sealants.

15. The liquid crystal display panel according to claim 14, wherein at least one of the third and fourth common pattern is formed of the same metal as a source electrode of the thin film transistor to be connected with the first common pattern through a second common contact hole that penetrates an insulating film.

16. The liquid crystal display panel according to claim 15, wherein the second common contact hole is formed in an area that overlaps the first and second sealants.

17. The liquid crystal display panel according to claim 6, further comprising a reflective electrode which is formed in a reflective area of a pixel area defined by a gate line and a data line.

18. A liquid crystal display panel, comprising:

a first substrate with a first electrode;

a second substrate with a contact area to apply an electrical signal to the first electrode and a second electrode;

a liquid crystal layer between the first and second substrates; and

a sealant that has at least one electric conductor disposed between the contact area and the first electrode, bonds the first and second substrates together, and electrically connects the first electrode with the contact area.

19. A method of fabricating a liquid crystal display panel, comprising:

providing a first substrate having a common electrode;

providing a second substrate including a pixel electrode that forms an electric field with the common electrode, a thin film transistor connected to the pixel electrode, a signal line that applies a signal to the thin film transistor, and a contact area in an area outside an area where the signal line is, and the contact area applies a common voltage to the common electrode; and

bonding the first substrate and the second substrate using a first sealant having a conductive spacer that connects the contact area with the common electrode.

20. The method according to claim 19, wherein the conductive spacer is formed of one of a conductive glass fiber and a conductive ball.

21. The method according to claim 19, wherein bonding the first substrate and the second substrate using the first sealant includes bonding the first substrate and the second substrate using a second sealant having a non-conductive spacer in an area overlapping the signal line and the first sealant.

22. The method according to claim 21, wherein the non-conductive spacer is one of a glass fiber and a ball spacer.

23. The method according to claim 19, wherein providing the second substrate includes:

forming a first common pattern on the second substrate;

forming at least one insulating film on the first common pattern;

forming at least one common contact hole that penetrates the insulating film to expose the first common pattern; and

forming a second common pattern that connects to the first common pattern through the common contact hole and connected to the conductive spacer.

24. The method according to claim 19, further comprising forming a liquid crystal layer between the first and second substrates.

26. The method according to claim 24, further comprising forming a liquid crystal layer between the first and second substrates.

25. A method of fabricating a liquid crystal display panel, comprising:

forming first electrode on a first substrate;

forming a contact area on a second substrate to apply an electrical signal to the first electrode and a second electrode;

bonding the first and second substrates using a sealant having at least one electrical conductor; and

electrically connecting the first electrode to the contact area with the electrical conductor.