Color display device

• US 5,818,550 A
• Filed: 10/18/1995
• Issued: 10/06/1998
• 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: Urazono, Takenobu, Kunii, Masafumi, Nakamura, Shinji, Kadota, Hisashi, Inoue, Yuko
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Duong, Tai V.
• Application Number:
  US08/544,568
• Time in Patent Office: 1,084 Days
• Field of Search: 359/59, 359/67, 359/68, 359/62, 359/74, 359/79, 345/92, 345/88, 349/42, 349/43, 349/44, 349/46, 349/47, 349/106, 349/110, 349/122, 349/138, 257/59, 257/72
• US Class Current: 349/43
• 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 pixel electrodes and color filters aligned with the respective pixel electrodes, said first substrate having a laminate structure including a first layer having said thin film transistors, and an interlayer insulating layer, a second layer having said color filters and a light shielding layer provided over said thin film transistor on said insulating layer, a third layer including a planarization film for providing a planarized surface thereon, and a fourth layer having said pixel electrodes aligned with said color filters superimposed on one another in that order;

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

an electro-optical material held in said gap.

2. A color display device according to claim 1, wherein said planarization film is formed of an organic transparent material.

3. A color display device according to claim 1, wherein said color filters are formed of an organic photosensitive material containing pigments dispersed therein.

4. A color display device according to claim 1, wherein said light shielding layer comprises a metal film through which said pixel electrodes of said fourth layer are electrically connected to said thin film transistors of said first layer.

5. A color display device according to claim 1, wherein said light shielding layer comprises an insulating film through which said pixel electrodes of said fourth layer extend into electrical contact with said thin film transistors of said first layer.

6. A color display device according to claim 1, wherein said thin film transistor is a top-gate type thin film transistor.

7. A color display device according to claim 1, wherein said thin film transistor is a bottom-gate type thin film transistor.

8. A color display device according to claim 1, wherein said electro-optical material is a liquid crystal.

9. The display device of claim 1, wherein the light shielding layer is in contact with the drain electrode.

10. A display device comprising:

a substrate;

at least one active layer formed on the substrate;

a first interlayer insulating film formed on the substrate in areas of the substrate where there is no active layer;

a source electrode formed over a source region of the active layer;

a drain electrode formed over a drain region of the active layer;

a gate electrode formed over a date region of the active layer;

a second inter-layer insulating film formed on the first interlayer insulating film and extending over the source electrode and above the gate electrode;

a color filter formed over the second interlayer insulating film;

a transparent-planarizing layer formed over the color filter;

a pixel electrode formed over the planarizing layer; and

further comprising a single mask layer formed over the second interlayer insulating film above the gate electrode beneath the planarizing layer extending from a location at least adjacent to the drain electrode.

11. The display device of claim 10, wherein the mask layer is formed beneath a portion of the color filter.

12. The display device of claim 10, wherein the mask layer is formed above a portion of the color filter.

13. The display device of claim 10, wherein the mask layer is conductive and connects the pixel electrode with the drain electrode.

14. The display device of claim 13, wherein the mask layer is formed beneath a portion of the color filter.

15. The display device of claim 13, wherein the mask layer is formed above a portion of the color filter.

16. The display device of claim 10, wherein the drain electrode extends to the top surface of the planarizing layer and connects directly with the pixel electrode.

17. The display device of claim 10, wherein the mask layer is in contact with the drain electrode.

18. A display device comprising:

a substrate;

at least one gate electrode formed on the substrate;

a gate insulating film formed over the gate electrode;

an active layer formed over the gate insulating film;

an etching stopper formed on the active layer over the gate electrode;

a source electrode connected to a source region of the active layer;

a drain electrode connected to a drain region of the active layer;

an interlayer-insulating film formed over the source electrode and etching stopper;

a mask layer formed on the interlayer-insulating film in a region above the active layer;

a color filter formed on the interlayer-insulating film in a region which is not above the active layer;

a planarizing layer formed on the color filter and mask layer; and

a pixel electrode formed on the planarizing layer.

19. A color display device comprising:

a substrate;

at least one thin film transistor having a semiconductor layer formed on the substrate;

an interlayer insulating layer formed over the thin film transistor;

a color filter formed on the interlayer insulating layer;

a light shielding layer formed on the interlayer insulating layer;

a transparent-planarizing layer formed on the color filter and light shielding layer for providing a planarized surface thereon; and

a pixel electrode formed on the planarizing layer.

20. A color display device of claim 19, wherein said pixel electrode is connected to the semiconductor layer.

21. A color display of claim 19, further comprising a drain electrode, and wherein said pixel electrode is connected to the semiconductor layer through the drain electrode.

22. A color display of claim 19, wherein said light shielding layer is a metal, and said pixel electrode is connected to the semiconductor layer through the light shielding layer.

23. A color display of claim 20, further comprising a drain electrode, and wherein said pixel electrode is connected to the semiconductor layer through the drain electrode.

24. A color display of claim 23, wherein said light shielding layer is a metal, and said pixel electrode is connected to the semiconductor layer through the light shielding layer.

25. A color display device, comprising:

a substrate;

at least one thin film transistor having a gate electrode formed on the substrate;

an interlayer insulating layer formed over the thin film transistor;

a color filter formed on the interlayer insulating layer;

a light shielding layer formed on the interlayer insulating layer;

a transparent-planarizing layer formed on the color filter and light-shielding layer for providing a planarized surface thereon; and

a pixel electrode formed on the planarizing layer.