Liquid crystal display device and method of manufacturing same

• US 6,067,140 A
• Filed: 11/13/1997
• Issued: 05/23/2000
• Est. Priority Date: 03/03/1997
• Status: Expired due to Term

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Choi, Jae Beom, Woo, Joung Won
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): NGUYEN, DUNG T
• Application Number:
  US08/969,470
• Time in Patent Office: 922 Days
• Field of Search: 349/129, 349/110, 349/144, 349/139, 349/125
• US Class Current: 349/129
• CPC Class Codes: G02F 1/133509 Filters, e.g. light shielding masks
• CPC Class Codes: G02F 1/133753 with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle

Abstract

A liquid crystal display device having a plurality of pixels, each pixel having a plurality of domains. In boundary regions between the domains, an opaque metal layer is formed to shield light transmission through these boundary regions and also to stabilize potential applied to pixel electrodes. A polyimide or photo-sensitive alignment layer is rubbed by fabric or exposed to light to provide alignment directions.

Claims

1. A liquid crystal display device having a plurality of pixels, each pixel having a plurality of domains, each domain having an alignment direction different from that of at least one neighboring domain, the device comprising:

a first and a second substrate;

a plurality of gate bus lines and a plurality of data bus lines crossing said gate bus lines on said first substrate;

a plurality of switching elements at the cross of said gate bus lines and said data bus lines over said first substrate, said switching elements including a gate insulation layer on said first substrate;

a light shielding layer between said each domain and said at least one neighboring domain, said light shielding layer being over said gate insulation layer; and

a liquid crystal layer between said first and second substrates.

2. The device of claim 1, further comprising:

a first alignment layer over said first substrate; and

a second alignment layer over said second substrate.

3. The device of claim 2, wherein the gate bus lines and opaque metal layer includes a same metal.

4. The device of claim 2, further comprising a color filter over said second substrate.

5. The device of claim 2, wherein said first or second alignment layer includes polyimide.

6. The device of claim 2, wherein said first or second alignment layer includes photo-sensitive materials.

7. The device of claim 6, wherein said photo-sensitive materials include a material selected from a group including polyvinylcinnamate based materials and polysiloxane based materials.

8. The device of claim 1, further comprising a black matrix layer between said each domain and said at least one neighboring domain of said each pixel.

9. The device of claim 8, wherein said light shielding layer is over said first substrate;

and

wherein said black matrix layer is over said second substrate and is spaced a distance from said light shielding layer.

10. The device of claim 1, wherein said light shielding layer is on first substrate.

11. A liquid crystal display device, comprising:

a first and a second substrate spaced a distance from and facing one another;

a plurality of gate bus lines and a plurality of data bus lines crossing said gate bus lines defining a plurality of pixel regions, each pixel region representing a pixel and having a first electrode associated therewith on said first substrate;

a plurality of switching elements at the cross of said gate bus lines and said data bus lines;

a first alignment layer having a plurality of domains corresponding to said each pixel region over said first substrate, each domain having an alignment direction different from that of at least one neighboring domain;

a storage capacitor between said domains of said first alignment layer for stabilizing electrical potential of said first electrode;

a light shielding layer facing said storage capacitor over said second substrate; and

a liquid crystal layer between said first and second substrates, said gate bus lines and said data bus lines being between said first alignment layer and said first substrate.

12. The device of claim 11, wherein said light shielding layer includes a black matrix.

13. The device of claim 11, further comprising a color filter layer over said second substrate.

14. The device of claim 11, further comprising a second electrode over said second substrate.

15. The device of claim 14, wherein said second electrode includes a transparent counter electrode.

16. The device of claim 11, further comprising a second alignment layer having an alignment direction facing, said first alignment layer over said second substrate.

17. The device of claim 16, wherein said alignment direction of said second alignment layer is different from said alignment direction of at least one of said domains of said first alignment layer.

18. The device of claim 11, wherein said gate bus lines and said storage capacitor includes a same metal.

19. The device of claim 11, wherein said first alignment layer includes polyimide.

20. The device of claim 11, wherein said first alignment layer includes photo-sensitive materials.

21. The device of claim 20, wherein said photo-sensitive materials include a material selected from a group including Polyvinylcinnamate based materials and polysiloxane based materials.

22. The device of claim 11, wherein said first electrode includes a transparent pixel electrode.

23. A method of making a liquid crystal display device having a plurality of gate bus lines, a plurality of data bus lines crossing said gate bus lines, a plurality of switching elements at the cross of said gate bus lines and said data bus lines, said switching elements including a gate insulation layer, and a plurality of pixels, comprising:

forming a plurality of domains for said each pixel, each domain having an alignment direction different from that of at least one neighboring domain; and

forming a light shielding layer between said each domain and said at least one neighboring domain, said light shielding layer being over said gate insulation layer.

24. The method of claim 23, further comprising forming a black matrix layer between said each domain and said at least one neighboring domain.

25. The method of claim 23, further comprising:

forming a first alignment layer over a first substrate; and

forming a second alignment layer over a second substrate opposite said first substrate.

26. The method of claim 25, wherein said light shielding layer and said gate bus lines are formed at the same time.

27. The method of claim 25, wherein said forming a first alignment layer includes exposing said first alignment layer to a light beam to obtain an alignment direction.

28. The method of claim 25, wherein said forming a second alignment layer includes exposing said second alignment layer to a light beam to obtain an alignment direction.

29. The method of claim 25, wherein said forming a first alignment layer includes rubbing a surface of said first alignment layer to obtain an alignment direction.

30. The method of claim 25, wherein said forming a second alignment layer includes rubbing a surface of said second alignment layer to obtain an alignment direction thereof.

31. A liquid crystal display device having a plurality of pixels, each pixel having a plurality of domains, each domain having an alignment direction different from that of at least one neighboring domain, the device comprising:

a first and a second substrate;

a plurality of gate bus lines and a plurality of data bus lines crossing said gate bus lines on said first substrate;

a plurality of switching elements at the cross of said gate bus lines and said data bus lines over said first substrate, said switching elements including a gate insulation layer on said first substrate;

a light shielding layer between said each domain and said at least one neighboring domain, said light shielding layer being over said gate insulation layer;

a first alignment layer over said first substrate;

a second alignment layer over said second substrate; and

a liquid crystal layer between said first and second substrates.

32. A liquid crystal display device having a plurality of pixels, each pixel having a plurality of domains, each domain having an alignment direction different from that of at least one neighboring domain, the device comprising:

a first and a second substrate;

a plurality of gate bus lines and a plurality of data bus lines crossing said gate bus lines on said first substrate;

a plurality of switching elements at the cross of said gate bus lines and said data bus lines over said first substrate, said switching elements including a gate insulation layer on said first substrate;

a light shielding layer between said each domain and said at least one neighboring domain, said light shielding layer being over said gate insulation layer;

a first photo-alignment layer over said first substrate;

a second photo-alignment layer over said second substrate; and

a liquid crystal layer between said first and second substrates.