LCD and fabrication method thereof having a pedestal and overlying organic film at a periphery of the display

• US 6,104,462 A
• Filed: 09/29/1998
• Issued: 08/15/2000
• Est. Priority Date: 09/30/1997
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Midorikawa, Teruyuki, Kurosaki, Minako
• Primary Examiner(s): MALINOWSKI, WALTER J
• Application Number:
  US09/161,949
• Time in Patent Office: 686 Days
• Field of Search: 349/138, 349/149, 349/152, 349/153, 349/155, 349/190
• US Class Current: 349/138
• CPC Class Codes: G02F 1/133388 with constructional differences between the display region and the peripheral region
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/1339 Gaskets; Spacers; Sealing of cells

Abstract

A liquid crystal displaying apparatus is disclosed, that comprises a pair of substrates, a liquid crystal material filled in the space between the pair of substrates, a plurality of lines formed on one of the pair of substrates, an organic film formed on the plurality of lines, a conductive film formed on the organic film, and a pedestal, wherein the plurality of lines extend from a first area to a second area, the organic film being disposed on the plurality of lines in the first area, the second area exceeding an edge portion of the organic film, wherein the pedestal is disposed between the first area and the second area through the edge portion, wherein the organic film is formed between the pedestal to a non-pedestal area, wherein the thickness in the vicinity of at least the edge portion of the organic film formed on the pedestal is smaller than the thickness of the organic film formed in the non-pedestal area, and wherein the thickness of the pedestal is smaller than the thickness of the organic film formed in the non-pedestal area.

Claims

1. A liquid crystal displaying apparatus, comprising:

a first substrate;

a plurality of scanning lines and signal lines on said first substrate in a matrix fashion;

a plurality of switching devices each disposed in the vicinity of an intersection of said scanning lies and said signal lines;

a plurality of pixel electrodes, connected to said switching devices, in a display area;

an organic film formed at a periphery of said display area;

a pedestal on said first substrate and underneath an edge portion of said organic film;

a second substrate opposed to said first substrate; and

a liquid crystal material filled in a space between said first substrate and said second substrate,

wherein the thickness of said organic film on said pedestal is thinner than the thickness of said organic film on a non-pedestal area, and

wherein the thickness of said pedestal is thinner than the thickness of said organic film on said non-pedestal area.

2. The liquid crystal displaying apparatus as set forth in claim 1, wherein said organic film is a light shielding film.

3. The liquid crystal displaying apparatus as set forth in claim 1, wherein said plurality of lines extend from said display area to an outside of said display area.

4. The liquid crystal displaying apparatus as set forth in claim 1, wherein said switching device has a semiconductor layer, a gate electrode, and a gate insulation film disposed between said semiconductor layer and said gate electrode, wherein said pedestal is composed of the same material as said gate insulation film.

5. The liquid crystal displaying apparatus as set forth in claim 1, further comprising a protection film formed on said switching devices so as to protect said switching device, wherein said pedestal is composed of the same material as said protection film.

6. The liquid crystal displaying apparatus as set forth in claim 1, further comprising a first inter-layer film disposed between said scanning lines and said signal lines, wherein said pedestal is composed of the same material as said first inter-layer film.

7. The liquid crystal displaying apparatus as set forth in claim 1, further comprising a second inter-layer film disposed between said switching device and said pixel electrode, wherein said pixel electrode is connected to said switching device and said pixel electrode, and wherein said pedestal is composed of the same material as said second inter-layer film.

8. The liquid crystal displaying apparatus as set forth in claim 7, wherein said second inter-layer film is colored.

9. The liquid crystal displaying apparatus as set forth in claim 1, wherein said first substrate and said second substrate are adhered with a sealing member in a shape of a closed curve, and wherein said pedestal is located inside said closed curve including an area of said seal member.

10. The liquid crystal displaying apparatus as set forth in claim 9, further comprising a column-shaped spacer formed between said first substrate and said second substrate so as to keep a distance therebetween, wherein said column-shaped spacer is composed of the same material as said organic film.

11. The liquid crystal displaying apparatus as set forth in claim 10, wherein said column-shaped spacer is formed in an area of said seal member.

12. The liquid crystal displaying apparatus as set forth in claim 10, wherein said column-shaped spacer is formed in an area of said seal member and said display area.

13. The liquid crystal displaying apparatus as set forth in claim 10, wherein said pedestal is formed in an area of said seal member, and said column-shaped spacer is formed on said pedestal.

14. A fabrication method of a liquid crystal displaying apparatus, comprising:

forming a plurality of scanning lines, signal lines, and switching devices at a display area of a first substrate;

forming an insulation layer at said display area and an outside of said display area;

forming a pedestal at said outside of said display area by patterning said insulation layer;

forming an organic film over said first substrate with said pedestal;

forming a surrounding pattern at a periphery of said display area by patterning said organic film;

adhering said first substrate and a second substrate; and

filling a liquid crystal material in a space between said first substrate and said second substrate,

wherein said surrounding pattern has an edge portion located on said pedestal.

15. The fabrication method as set forth in claim 14, wherein said insulation layer is a colored layer.

16. The fabrication method as set forth in claim 14, further comprising forming a column-shaped spacer for keeping the space between said first substrate and said second substrate, wherein said column-shaped spacer forming is the same as said surrounding pattern forming.