Color display device

• US 5,943,107 A
• Filed: 08/03/1998
• Issued: 08/24/1999
• Est. Priority Date: 10/19/1994
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Nakamura, Shinj, Urazono, Takenobu, Kunii, Masafumi, Kadota, Hisashi, Inoue, Yuko
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Duong, Tai V.
• Application Number:
  US09/128,091
• Time in Patent Office: 386 Days
• Field of Search: 349/42, 349/43, 349/44, 349/46, 349/47, 349/106, 349/110, 349/122, 349/138, 257/59, 257/72, 345/92, 345/88
• US Class Current: 349/44
• CPC Class Codes: G02F 1/133357 Planarisation layers
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/136209 Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence

Abstract

A color display device such as an active-matrix type liquid crystal display apparatus has a first substrate having pixel electrodes arranged in the form of the matrix, switching elements associated with respective pixel electrodes and color filters aligned with the respective pixel electrodes. The first substrate is composed of a laminate structure including, superposed in the mentioned sequence, a first layer having the switching elements, a second layer having the color filters, a third layer including a planarization film which fills convexities presented by the switching elements and the color filters, and a fourth layer having the pixel electrodes aligned with the color filter. The display device also has a second substrate including a counter electrode and adjoined to the first substrate leaving a predetermined gap left therebetween. A liquid crystal is charged in the gap between the first and second substrates.

Claims

1. A color display device, comprising:

a first substrate having pixel electrodes arranged in the form of a matrix, thin film transistors associated with respective ones of said pixel electrodes and color filters aligned with the respective pixel electrodes, said thin film transistor being covered with an interlayer insulating layer, said pixel electrodes being formed on a planarized surface over the thin film transistors and the interlayer insulating layer by a transparent planarization layer, said color filter being formed between the planarization layer and the interlayer insulating layer, said pixel electrodes being electrically connected to the thin film transistors through a light shielding layer;

a second substrate having a counter electrode adjoined to said first substrate through a gap therebetween; and

an electro-optical material held in said gap.

2. A color display device as claimed in claim 1, wherein each of said thin film transistors is a top-gate type transistor.

3. A color display device as claimed in claim 1, wherein each of said thin film transistors is a bottom-gate type transistor.

4. A color display device as claimed in claim 1, wherein said light shielding layer comprises a material selected from the group consisting of Ti, Al, TiNx, Mo, Cr, W, and a silicide thereof.

5. A color display device as claimed in claim 1, wherein said planarization layer comprises an organic resin.

6. A color display device as claimed in claim 1, wherein said color filter comprises an organic photsensitive material containing pigments dispersed therein.

7. A color display device as claimed in claim 1, wherein said light shielding layer constitutes a part of black matrix.

8. A color display device as claimed in claim 1, wherein said light shielding layer is connected to an active layer of said thin film transistors through an electrode.

9. A color display device as claimed in claim 1, wherein said interlayer insulating layer comprises an inorganic material.

10. A color display device as claimed in claim 1, wherein said interlayer insulating layer has two-layered structure which includes a p-SiNx film.