Reflection type display device using a light shading film with a light shading material evenly dispersed throughout

• US 7,176,993 B2
• Filed: 04/02/2002
• Issued: 02/13/2007
• Est. Priority Date: 02/06/1997
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Fukunaga, Takeshi
• Primary Examiner(s): Chowdhury; Tarifur R.
• Application Number:
  US10/115,187
• Publication Number:
  US 20020109660A1
• Time in Patent Office: 1,778 Days
• Field of Search: 349/138, 349/149, 349/152, 349/110, 349/111, 349 42- 44, 349/46, 257/59, 257/72, 345/94, 345/99
• US Class Current: 349/111
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133357 Planarisation layers
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/13454 Drivers integrated on the active matrix substrate G02F1/136277 takes precedence
• 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 2203/02 reflective

Abstract

Among insulating layers for insulating and separating first wiring lines, second wiring lines, and pixel electrodes constituting a reflection type display device, at least one layer is made of an insulating film in which a carbon-based material or a pigment is dispersed. By this structure, a conventional step of forming a black mask can be greatly simplified.

Claims

1. A portable information terminal having a reflection type display device, said reflection type display device comprising:

a pixel thin film transistor provided over a substrate;

an insulating film over said pixel thin film transistor;

a light shading film having an uneven downward surface, said uneven downward surface located over said pixel thin film transitor, said light shading film comprising an organic resin; and

a pixel electrode provided over said light shading film,

wherein said light shading film covers entirely said insulating film.

2. A device according to claim 1 wherein said substrate comprises a glass.

3. A device according to claim 1 wherein said light shading material is a carbon-based material.

4. A device according to claim 1 wherein said light shading material includes a pigment.

5. A portable information terminal having a reflection type display device, said reflection type display device comprising:

a pixel thin film transistor provided over a substrate;

an insulating film over said pixel thin film transistor;

a light shading film having an uneven downward surface, said uneven downward surface located over said pixel thin film transistor, said light shading film comprising an organic resin; and

a pixel electrode having a rough surface provided over said light shading film; and

wherein said light shading film covers entirely said insulating film.

6. A device according to claim 5 wherein said substrate comprises a glass.

7. A device according to claim 5 wherein said light shading material is a carbon-based material.

8. A device according to claim 5 wherein said light shading material includes a pigment.

9. A portable information terminal having a reflection type display device, said reflection type display device comprising:

a pixel thin film transistor provided over a substrate;

a thin film transistor for a driver circuit over said substrate;

an insulating film over said pixel thin film transistor and said thin film transistor for said driver circuit;

a light shading film having an uneven downward surface, said uneven downward surface located over said pixel thin film transistor and said thin film transistor for said driver, said light shading film comprising an organic resin; and

a pixel electrode provided over said light shading film, and

wherein said light shading film covers entirely said insulating film.

10. A device according to claim 9 wherein said substrate comprises a glass.

11. A device according to claim 9 wherein said light shading material is a carbon-based material.

12. A device according to claim 9 wherein said light shading material includes a pigment.

13. A portable information terminal having a reflection type display device, said reflection type display device comprising:

a substrate;

a first light shading film over said substrate;

a pixel thin film transistor provided over said first light shading film;

an insulating film over said pixel thin film transistor;

a light shading film having an uneven downward surface, said uneven downward surface located over said pixel thin film transistor, said light shading film comprising an organic resin; and

a pixel electrode provided over said light shading film,

wherein said light shading film covers entirely said insulating film.

14. A portable information terminal according to claim 13 wherein said light shading material is a carbon-based material.

15. A portable information terminal according to claim 13 wherein said light shading material includes a pigment.

16. A portable telephone comprising:

an audio output portion;

an audio input portion; and

a reflection type display device,

wherein the reflection type display device comprises;

a pixel thin film transistor provided over a substrate;

an insulating film over said pixel thin film transistor;

a light shading film having an uneven downward surface, said uneven downward surface located over said pixel thin film transistor, said light shading film comprising an organic resin; and

a pixel electrode provided over said light shading film,

wherein said light shading film covers entirely said insulating film.

17. A portable telephone according to claim 16 wherein said light shading material is a carbon-based material.

18. A portable telephone according to claim 16 wherein said light shading material includes a pigment.

19. A portable telephone comprising:

an audio output portion;

an audio input portion; and

a reflection type display device,

wherein the reflection type display device comprises;

a pixel thin film transistor provided over a substrate;

an insulating film over said pixel thin film transistor;

a light shading film having an uneven downward surface, said uneven downward surface located over said pixel thin film transistor, said light shading film comprising an organic resin; and

a pixel electrode having a rough surface provided over said light shading film,

wherein said light shading film covers entirely said insulating film.

20. A portable telephone according to claim 19 wherein said light shading material is a carbon-based material.

21. A portable telephone according to claim 19 wherein said light shading material includes a pigment.

22. A portable telephone comprising:

an audio output portion;

an audio input portion; and

a reflection type display device,

wherein the reflection type display device comprises;

a pixel thin film transistor provided over a substrate;

a thin film transistor for a driver circuit over said substrate;

an insulating film over said pixel thin film transistor and said thin film transistor for said driver circuit;

a light shading film having an uneven downward surface, said uneven downward surface located over said pixel thin film transistor and said thin film transistor for said driver, said light shading film comprising an organic resin; and

a pixel electrode provided over said light shading film,

wherein said light shading film covers entirely said insulating film.

23. A portable telephone according to claim 22 wherein said light shading material is a carbon-based material.

24. A portable telephone according to claim 22 wherein said light shading material includes a pigment.

25. A portable telephone comprising:

an audio output portion;

an audio input portion; and

a reflection type display device,

wherein the reflection type display device comprises;

a substrate;

a first light shading film over said substrate;

a pixel thin film transistor provided over said first light shading film;

an insulating film over said pixel thin film transistor;

a light shading film having an uneven downward surface, said uneven downward surface located over said pixel thin film transistor, said light shading film comprising an organic resin; and

a pixel electrode provided over said light shading film,

wherein said light shading film covers entirely said insulating film.

26. A portable telephone according to claim 25 wherein said light shading material is a carbon-based material.

27. A portable telephone according to claim 25 wherein said light shading material includes a pigment.

28. A projector comprising:

a light source;

a reflection type display device;

an optical system; and

a screen,

wherein the reflection type display device comprises;

a pixel thin film transistor provided over a substrate;

an insulating film over said pixel thin film transistor;

a light shading film having an uneven downward surface, said uneven downward surface located over said pixel thin film transistor, said light shading film comprising an organic resin to provide a leveled upper surface over said uneven downward surface located over said pixel thin film transistor; and

a pixel electrode provided over said leveled upper surface,

wherein said light shading film covers entirely said insulating film.

29. A projector according to claim 28 wherein said light shading material is a carbon-based material.

30. A projector according to claim 28 wherein said light shading material includes a pigment.

31. A projector comprising:

a light source;

a reflection type display device;

an optical system; and

a screen,

wherein the reflection type display device comprises;

a pixel thin film transistor provided over a substrate;

a thin film transistor for a driver circuit over said substrate;

an insulating film over said pixel thin film transistor and said thin film transistor for said driver circuit;

a light shading film having an uneven downward surface, said uneven downward surface located over said pixel thin film transistor and said thin film transistor for said driver, said light shading film comprising an organic resin to provide a leveled upper surface over said uneven downward surface located over said pixel thin film transistor and said thin film transistor for said driver; and

a pixel electrode provided over said leveled upper surface,

wherein said light shading film covers entirely said insulating film.

32. A projector according to claim 31 wherein said light shading material is a carbon-based material.

33. A projector according to claim 31 wherein said light shading material includes a pigment.

34. A projector comprising:

a light source;

a reflection type display device;

an optical system; and

a screen,

wherein the reflection type display device comprises;

a substrate;

a first light shading film over said substrate;

a pixel thin film transistor provided over said first light shading film;

an insulating film over said pixel thin film transistor;

a light shading film having an uneven downward surface, said uneven downward surface located over said pixel thin film transistor, said light shading film comprising an organic resin to provide a leveled upper surface over said uneven downward surface located over said pixel thin film transistor; and

a pixel electrode provided over said leveled upper surface,

wherein said light shading film covers entirely said insulating film.

35. A projector according to claim 34 wherein said light shading material is a carbon-based material.

36. A projector according to claim 34 wherein said light shading material includes a pigment.