Method of manufacturing a liquid crystal display device

• US 6,414,739 B2
• Filed: 02/01/2001
• Issued: 07/02/2002
• Est. Priority Date: 11/13/1997
• Status: Expired due to Term

• Current Assignee: Gold Charm Limited (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: NEC Corporation
• Inventors: Suzuki, Seiji
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Chowdhury, Tarifur R.
• Application Number:
  US09/774,615
• Publication Number:
  US 20010013853A1
• Time in Patent Office: 516 Days
• Field of Search: 349/155, 349/106, 349/109, 349/110, 349/111, 349/42, 349/187
• US Class Current: 349/155
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• 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 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]

Abstract

The liquid crystal display is composed of an array substrate on which TFTs are arranged as active switching elements in a matrix form and covered with an orientation film. On the facing surface of the opposing substrate as a color filter, a light shielding film, color layers of red, green, and blue are arranged. The area excluding the area covered by the light shielding layer is turned into a display pixel area, and the surfaces of the opposing substrate are covered with an orientation film. The cell gap g at the display pixel area is larger than spacers in the cell, and cell gaps of color layers, which are compressed, overlapping the light shielding layer are smaller than spacers. The liquid crystal molecules are not subjected to the anomalous orientation and the light leakage is avoided. An after-image characteristic can be eliminated by regulating the projection of the color layers.

Claims

1. A method of manufacturing a liquid crystal display panel, comprising:

forming a first substrate having a plurality of switching devices;

forming a second substrate having light shielding regions of a first thickness and display regions of a second thickness;

positioning a plurality of spacing devices between said first substrate and said second substrate;

proximally positioning first surfaces of the first substrate and the second substrate with respect to each other; and

injecting a liquid crystal between said first substrate and said second substrate to form a liquid crystal layer, wherein said spacing devices are positioned in said display regions after said proximally positioning of said first surfaces, and have a diameter greater than a first gap between said light shielding regions and the first surface of the first substrate and less than a second gap between said display regions and the first surface of the first substrate.

2. The method of claim 1, wherein the step of forming said first substrate comprises:

forming a control electrode at a side surface of an array substrate;

forming an insulating film on said control electrode;

forming a semiconductor film on said insulating film;

forming first and second electrodes on said semiconductor film; and

etching a channel in said semiconductor film.

3. The method of claim 2, wherein said control electrode is formed by patterning metallic chromium.

4. The method of claim 2, further comprising forming a passivation film on the first substrate.

5. The method of claim 1, wherein the step of forming said second substrate comprises:

forming a light shielding film on predetermined areas of an opposing substrate; and

forming a plurality of color layers on the opposing substrate and the light shielding film, one of said color layers differing in thickness from other said color layers.

6. The method of claim 5, wherein the step of forming said plurality of color layers includes sequentially forming a red layer, a blue layer, and a green layer.

7. The method of claim 6, wherein said red layer has a greater thickness than said green layer, and said green layer has a greater thickness than said blue layer.

8. The method of claim 5, further comprising forming an overcoat layer on a first surface of said second substrate.

9. The method of claim 1, further comprising forming a first orientation film on the first substrate and a second orientation film on the second substrate.

10. The method of claim 9, further comprising:

forming a passivation film between the first substrate and the first orientation film; and

forming an overcoat layer between the second substrate and the second orientation film.

11. The method of claim 1, further comprising:

forming first and second polarization plates on respective outer surfaces of the first substrate and the second substrate; and

sealing a peripheral area of said first polarizer and said second polarizer.

12. The method of claim 1, wherein said first thickness and said second thickness can be varied by changing a density of said spacing devices.

13. The method of claim 1, wherein a difference between said second gap and said diameter of said spacing devices is at least 0.3 μ

m.