Information input/output apparatus

• US 6,628,263 B1
• Filed: 08/22/1997
• Issued: 09/30/2003
• Est. Priority Date: 03/04/1994
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Konuma, Toshimitsu, Nishi, Takeshi, Yamazaki, Shunpei
• Primary Examiner(s): CHANG, KENT WU
• Application Number:
  US08/916,260
• Time in Patent Office: 2,230 Days
• Field of Search: 345/32, 345/87, 345/88, 345/92, 345/104, 345/157, 345/173-175, 345/187, 345/207, 345/102, 345/156, 345/179, 382/324, 382/321, 349/5, 349/6, 349/11, 349/12, 349/2
• US Class Current: 345/104
• CPC Class Codes: G06F 3/0386 for light pen
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: G06F 3/0425 using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected tracking a projected light spot to determine a position on a display surface G06F3/0386
• CPC Class Codes: G06F 3/046 by electromagnetic means
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

An information input/output apparatus comprising a display device, a screen on which an image displayed on the display device is projected with magnification, and a position detecting means for detecting a position of an arbitrarily designated particular point on the screen.

Claims

1. A rear projection-type display device comprising:

a main body;

a light source provided in the main body;

at least one first liquid crystal electro-optical device provided in the main body and receiving light from said light source, said liquid crystal electro-optical device comprising a plurality of crystalline thin-film transistors that include switching thin-film transistors and driving peripheral circuit thin-film transistors formed over a substrate;

a screen comprising a second liquid crystal device wherein the screen receives light projected through the first liquid crystal electro-optical device; and

a black matrix provided over said screen.

2. A rear projection-type display device according to claim 1 wherein said driving peripheral circuit thin-film transistors are complementary types.

3. A rear projection-type display device according to claim 2 wherein said peripheral circuits comprise at least one of a decoder, CPU, shift register and memory.

4. A rear projection-type display device according to claim 1 wherein said at least one first liquid crystal electro-optical device comprises three liquid crystal electro-optical devices.

5. A rear projection-type display device according to claim 1 wherein a number of pixels of said at least one first liquid crystal electro-optical device is 640×

480 or 1280×

1024.

6. A rear projection-type display device according to claim 1 wherein said rear projection-type display device comprises dichroic mirrors.

7. A rear projection-type display device according to claim 4 wherein said rear projection-type display device comprises dichroic mirrors.

8. A rear projection-type display device according to claim 1 wherein said sensor comprises a CCD device.

9. A rear projection-type display device comprising:

a main body;

a light source provided in the main body;

at least one first liquid crystal electro-optical device provided in the main body and receiving light from said light source, said liquid crystal electro-optical device comprising a plurality of crystalline thin-film transistors that include switching thin-film transistors and driving peripheral circuit thin-film transistors formed over a substrate;

a sensor; and

a screen comprising a second liquid crystal device wherein the screen receives light projected through the first liquid crystal electro-optical device,

wherein said sensor senses light entered into an inside of the main body from an outside thereof through said screen.

10. A rear projection-type display device according to claim 9 wherein said driving peripheral circuit thin-film transistors are complementary types.

11. A rear projection-type display device according to claim 9 wherein said peripheral circuits comprise at least one of a decoder, CPU, shift register and memory.

12. A rear projection-type display device according to claim 9 wherein said at least one first liquid crystal electro-optical device comprises three liquid crystal electro-optical devices.

13. A rear projection-type display device according to claim 9 wherein a number of pixels of said at least one first liquid crystal electro-optical device is 640×

480 or 1280×

1024.

14. A rear projection-type display device according to claim 9 wherein said rear projection-type display device comprises dichroic mirrors.

15. A rear projection-type display device according to claim 12 wherein said rear projection-type display device comprises dichroic mirrors.

16. A rear projection-type display device according to claim 9 wherein said sensor comprises a CCD device.

17. A rear projection-type display device comprising:

a main body;

a light source provided in the main body;

at least one first liquid crystal electro-optical device provided in the main body and receiving light from said light source, said liquid crystal electro-optical device comprising a plurality of crystalline thin-film transistors that include switching thin-film transistors and driving peripheral circuit thin-film transistors formed over a substrate;

a screen comprising a second liquid crystal device wherein the screen receives light projected through the first liquid crystal electro-optical device; and

a black matrix provided over said screen,

wherein said second liquid crystal device is a light scattering liquid crystal device.

18. A rear projection-type display device according to claim 17 wherein said driving peripheral circuit thin-film transistors are complementary types.

19. A rear projection-type display device according to claim 17 wherein said peripheral circuits comprise at least one of a decoder, CPU, shift register and memory.

20. A rear projection-type display device according to claim 17 wherein said at least one first liquid crystal electro-optical device comprises three liquid crystal electro-optical devices.

21. A rear projection-type display device according to claim 17 wherein a number of pixels of said at least one first liquid crystal electro-optical device is 640×

480 or 1280×

1024.

22. A rear projection-type display device according to claim 17 wherein said rear projection-type display device comprises dichroic mirrors.

23. A rear projection-type display device according to claim 17 wherein said sensor comprises a CCD device.

24. A rear projection-type display device comprising:

a main body;

a light source provided in the main body;

at least one first liquid crystal electro-optical device provided in the main body and receiving light from said light source; and

a screen comprising a second liquid crystal device wherein the screen receives light projected by the first liquid crystal electro-optical device,

wherein said second liquid crystal device comprises a polymer dispersion type liquid crystal device.

25. A rear projection-type display device according to claim 24 wherein said driving peripheral circuit thin-film transistors are complementary types.

26. A rear projection-type display device according to claim 24 wherein said peripheral circuits comprise at least one of a decoder, CPU, shift register and memory.

27. A rear projection-type display device according to claim 24 wherein said at least one first liquid crystal electro-optical device comprises three liquid crystal electro-optical devices.

28. A rear projection-type display device according to claim 24 wherein a number of pixels of said at least one first liquid crystal electro-optical device is 640×

480 or 1280×

1024.

29. A rear projection-type display device according to claim 24 wherein said rear projection-type display device comprises dichroic mirrors.

30. A rear projection-type display device according to claim 24 wherein said sensor comprises a CCD device.

31. A rear projection-type display device comprising:

a main body;

a light source provided in the main body;

at least one first liquid crystal electro-optical device provided in the main body and receiving light from said light source; and

a screen comprising a second liquid crystal device wherein the screen receives light projected by the first liquid crystal electro-optical device.

32. A rear projection-type display device according to claim 31 wherein said second liquid crystal device is a light scattering liquid crystal device.

33. A rear projection-type display device according to claim 31 wherein said second light crystal device is a polymer dispersion type liquid crystal device.

34. A rear projection-type display device according to claim 31 wherein said at least one first liquid crystal electro-optical device comprises three liquid crystal electro-optical devices.

35. A rear projection-type display device according to claim 31 wherein a number of pixels of said at least one first liquid crystal electro-optical devices is 640×

480 or 1280×

1024.

36. A rear projection-type display device according to claim 31 wherein said rear projection-type display device comprises dichroic mirrors.

37. A rear projection-type display device according to claim 31 wherein said sensor comprises a CCD device.

38. A projection-type display device comprising:

a light source;

at least one first liquid crystal electro-optical device receiving light from said light source, said liquid crystal electro-optical device comprising a plurality of crystalline thin-film transistors that include switching thin-film transistors and driving peripheral circuit thin-film transistors formed over a substrate; and

a screen comprising a second liquid crystal device wherein the screen receives light projected through the first liquid crystal electro-optical device.

39. A projection-type display device according to claim 38 wherein said driving peripheral circuit comprises a shift register circuit operating in frequency range of more than 1 MHZ.

40. A projection-type display device according to claim 38 wherein said driving peripheral circuit thin-film transistors are complementary types.

41. A projection-type display device according to claim 38 wherein said peripheral circuits comprise at least one of a decoder, CPU, shift register and memory.

42. A projection-type display device according to claim 38 wherein said at least one first liquid crystal electro-optical device comprises three liquid crystal electro-optical devices.

43. A projection-type display device according to claim 38 wherein a number of pixels of said at least one first liquid crystal electro-optical device is 640×

480 or 1280×

1024.

44. A display device according to claim 38 wherein said rear projection-type display device comprises dichroic mirrors.

45. A projection-type display device according to claim 38 wherein said second liquid crystal device is a light scattering liquid crystal device.

46. A projection-type display device according to claim 38 wherein said second liquid crystal device is a polymer dispersion liquid crystal device.

47. A projection-type display device according to claim 38 wherein said sensor comprises a CCD device.

48. A rear projection-type display device comprising:

a main body;

a light source provided in the main body;

at least one first liquid crystal electro-optical device provided in the main body and receiving light from said light source, said liquid crystal electro-optical device comprising a plurality of crystalline thin-film transistors that include switching thin-film transistors and driving peripheral circuit thin-film transistors formed over a substrate, wherein said driving peripheral circuit comprises a shift register circuit operating in frequency range of more than 1 MHZ;

a screen comprising a second liquid crystal device wherein the screen receives light projected through the first liquid crystal electro-optical device; and

a sensor, wherein said sensor senses light entered into an inside of the main body from an outside thereof through said screen.

49. A rear projection-type display device according to claim 48 wherein said shift register circuit operates in frequency range of 1-50 MHz.

50. A rear projection-type display device according to claim 49 wherein said driving peripheral circuit thin-film transistors are complementary types.

51. A rear projection-type display device according to claim 50 wherein said peripheral circuits comprise at least one of a decoder, CPU, shift register and memory.

52. A rear projection-type display device according to claim 51 wherein said at least one first liquid crystal electro-optical device comprises three liquid crystal electro-optical devices.

53. A rear projection-type display device according to claim 52 wherein a number of pixels of said at least one first liquid crystal electro-optical device is 640×

480 or 1280×

1024.

54. A rear projection-type display device according to claim 53 wherein said rear projection-type display device comprises dichroic mirrors.

55. A rear projection-type display device according to claim 54 wherein said rear projection-type display device comprises dichroic mirrors.

56. A rear projection-type display device according to claim 50 wherein said second liquid crystal device is a light scattering liquid crystal device.

57. A rear projection-type display device according to claim 50 wherein said second liquid crystal device is a polymer dispersion type liquid crystal device.

58. A rear projection-type display device according to claim 48 wherein said sensor comprises a CCD device.