Field sequential liquid crystal display device and driving method thereof, and head mounted display

• US 20050068468A1
• Filed: 11/17/2004
• Published: 03/31/2005
• Est. Priority Date: 10/30/1998
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Koyama, Jun, Yamazaki, Shunpei
• Granted Patent: US 7,834,830 B2
• Time in Patent Office: Days
• US Class Current: 349/43
• 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 1/136213 Storage capacitors associated with the pixel electrode
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G09G 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 2310/024 Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 3/003 to produce spatial visual effects
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/2025 the sub-frames having all the same time duration
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A display with high resolution and reduced flicker of image. The driving method of this invention, or the field sequential driving method, divides one frame of image into a plurality of subframes, i.e., divides the period of one image frame into a plurality of subframe periods; displays red, green and blue images during the corresponding subframe periods; and, when these color images are to be displayed, turns on the corresponding red, green and blue backlights successively to feed light to the display section.

Claims

1. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a pixel matrix circuit over the substrate, comprising a thin film transistor; and

a backlight comprising a light emitting diode,

wherein a channel forming region of the thin film transistor comprising a polycrystalline silicon.

25. A liquid crystal device according to claim 1, wherein the light emitting diode is any one of a red light emitting diode, green light emitting diode and blue light emitting diode.

53. An electronic device comprising the liquid crystal display device according to claim 1, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

2. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a drive circuit over the substrate; and

a pixel matrix circuit over the substrate, comprising a thin film transistor; and

a backlight comprising a light emitting diode,

wherein a channel forming region of the thin film transistor comprising a polycrystalline silicon.

26. A liquid crystal device according to claim 2, wherein the light emitting diode is any one of a red light emitting diode, green light emitting diode and blue light emitting diode.

54. An electronic device comprising the liquid crystal display device according to claim 2, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

3. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a pixel matrix circuit over the substrate, comprising a thin film transistor; and

an IC chip over the substrate; and

a backlight comprising a light emitting diode,

wherein a channel forming region of the thin film transistor comprising a polycrystalline silicon.

27. A liquid crystal device according to claim 3, wherein the light emitting diode is any one of a red light emitting diode, green light emitting diode and blue light emitting diode.

55. An electronic device comprising the liquid crystal display device according to claim 3, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

4. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a drive circuit over the substrate; and

a pixel matrix circuit over the substrate, comprising a thin film transistor; and

an IC chip over the substrate; and

a backlight comprising a light emitting diode,

wherein a channel forming region of the thin film transistor comprising a polycrystalline silicon.

28. A liquid crystal device according to claim 4, wherein the light emitting diode is any one of a red light emitting diode, green light emitting diode and blue light emitting diode.

56. An electronic device comprising the liquid crystal display device according to claim 4, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

5. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a pixel matrix circuit, comprising;

a switching thin film transistor over the substrate, having a first gate electrode and a second gate electrode;

a pixel electrode electrically connected to the switching thin film transistor; and

a gate line electrically connected to the first gate electrode and the second gate electrode; and

a backlight comprising a light emitting diode,

wherein a channel forming region of the switching thin film transistor comprising a polycrystalline silicon.

29. A liquid crystal device according to claim 5, wherein the light emitting diode is any one of a red light emitting diode, green light emitting diode and blue light emitting diode.

41. A liquid crystal display device according to claim 5, the switching thin film transistor comprising a semiconductor layer over the substrate, having a first doped region and a second doped region,

wherein the consistency of the first doped region is lower than the second doped region.

57. An electronic device comprising the liquid crystal display device according to claim 5, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

6. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a drive circuit over the substrate;

a pixel matrix circuit, comprising;

a switching thin film transistor over the substrate, having a first gate electrode and a second gate electrode;

a pixel electrode electrically connected to the switching thin film transistor; and

a gate line electrically connected to the drive circuit, the first gate electrode and the second gate electrode; and

a backlight comprising a light emitting diode,

wherein a channel forming region of the switching thin film transistor comprising a polycrystalline silicon.

30. A liquid crystal device according to claim 6, wherein the light emitting diode is any one of a red light emitting diode, green light emitting diode and blue light emitting diode.

42. A liquid crystal display device according to claim 6, the switching thin film transistor comprising a semiconductor layer over the substrate, having a first doped region and a second doped region,

wherein the consistency of the first doped region is lower than the second doped region.

58. An electronic device comprising the liquid crystal display device according to claim 6, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

7. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a pixel matrix circuit, comprising;

a switching thin film transistor over the substrate, having a first gate electrode and a second gate electrode;

a pixel electrode electrically connected to the switching thin film transistor; and

a gate line electrically connected to the first gate electrode and the second gate electrode;

an IC chip over the substrate; and

a backlight comprising a light emitting diode,

wherein a channel forming region of the switching thin film transistor comprising a polycrystalline silicon.

31. A liquid crystal device according to claim 7, wherein the light emitting diode is any one of a red light emitting diode, green light emitting diode and blue light emitting diode.

43. A liquid crystal display device according to claim 7, the switching thin film transistor comprising a semiconductor layer over the substrate, having a first doped region and a second doped region,

wherein the consistency of the first doped region is lower than the second doped region.

59. An electronic device comprising the liquid crystal display device according to claim 7, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

8. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a drive circuit over the substrate;

a pixel matrix circuit, comprising;

a switching thin film transistor over the substrate, having a first gate electrode and a second gate electrode;

a pixel electrode electrically connected to the switching thin film transistor; and

a gate line electrically connected to the first gate electrode and the second gate electrode;

an IC chip over the substrate; and

a backlight comprising a light emitting diode,

wherein a channel forming region of the switching thin film transistor comprising a polycrystalline silicon.

32. A liquid crystal device according to claim 8, wherein the light emitting diode is any one of a red light emitting diode, green light emitting diode and blue light emitting diode.

44. A liquid crystal display device according to claim 8, the switching thin film transistor comprising a semiconductor layer over the substrate, having a first doped region and a second doped region,

wherein the consistency of the first doped region is lower than the second doped region.

60. An electronic device comprising the liquid crystal display device according to claim 8, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

9. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate; and

a pixel matrix circuit over the substrate, comprising a thin film transistor;

wherein a channel forming region of the thin film transistor comprising a polycrystalline silicon, and

wherein the liquid crystal display device is driven by a field sequential driving method.

61. An electronic device comprising the liquid crystal display device according to claim 9, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

10. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a drive circuit over the substrate; and

a pixel matrix circuit over the substrate, comprising a thin film transistor;

wherein a channel forming region of the thin film transistor comprising a polycrystalline silicon, and

wherein the liquid crystal display device is driven by a field sequential driving method.

62. An electronic device comprising the liquid crystal display device according to claim 10, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

11. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a pixel matrix circuit over the substrate, comprising a thin film transistor; and

an IC chip over the substrate;

wherein a channel forming region of the thin film transistor comprising a polycrystalline silicon, and

wherein the liquid crystal display device is driven by a field sequential driving method.

63. An electronic device comprising the liquid crystal display device according to claim 11, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

12. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a drive circuit over the substrate; and

a pixel matrix circuit over the substrate, comprising a thin film transistor; and

an IC chip over the substrate;

wherein a channel forming region of the thin film transistor comprising a polycrystalline silicon, and

wherein the liquid crystal display device is driven by a field sequential driving method.

64. An electronic device comprising the liquid crystal display device according to claim 12, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

13. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a pixel matrix circuit, comprising;

a switching thin film transistor over the substrate, having a first gate electrode and a second gate electrode;

a pixel electrode electrically connected to the switching thin film transistor; and

a gate line electrically connected to the first gate electrode and the second gate electrode;

wherein a channel forming region of the switching thin film transistor comprising a polycrystalline silicon, and

wherein the liquid crystal display device is driven by a field sequential driving method.

45. A liquid crystal display device according to claim 13, the switching thin film transistor comprising a semiconductor layer over the substrate, having a first doped region and a second doped region,

wherein the consistency of the first doped region is lower than the second doped region.

65. An electronic device comprising the liquid crystal display device according to claim 13, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

14. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a drive circuit over the substrate; and

a pixel matrix circuit, comprising;

a switching thin film transistor over the substrate, having a first gate electrode and a second gate electrode;

a pixel electrode electrically connected to the switching thin film transistor; and

a gate line electrically connected to the drive circuit, the first gate electrode and the second gate electrode;

wherein a channel forming region of the switching thin film transistor comprising a polycrystalline silicon, and

wherein the liquid crystal display device is driven by a field sequential driving method.

46. A liquid crystal display device according to claim 14, the switching thin film transistor comprising a semiconductor layer over the substrate, having a first doped region and a second doped region,

wherein the consistency of the first doped region is lower than the second doped region.

66. An electronic device comprising the liquid crystal display device according to claim 14, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

15. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a pixel matrix circuit, comprising;

a switching thin film transistor over the substrate, having a first gate electrode and a second gate electrode;

a pixel electrode electrically connected to the switching thin film transistor; and

a gate line electrically connected to the first gate electrode and the second gate electrode; and

an IC chip over the substrate;

wherein a channel forming region of the switching thin film transistor comprising a polycrystalline silicon, and

wherein the liquid crystal display device is driven by a field sequential driving method.

47. A liquid crystal display device according to claim 15, the switching thin film transistor comprising a semiconductor layer over the substrate, having a first doped region and a second doped region,

wherein the consistency of the first doped region is lower than the second doped region.

67. An electronic device comprising the liquid crystal display device according to claim 15, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

16. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a drive circuit over the substrate;

a pixel matrix circuit, comprising;

a switching thin film transistor over the substrate, having a first gate electrode and a second gate electrode;

a pixel electrode electrically connected to the switching thin film transistor; and

a gate line electrically connected to the drive circuit, the first gate electrode and the second gate electrode; and

an IC chip over the substrate;

wherein a channel forming region of the switching thin film transistor comprising a polycrystalline silicon, and

wherein the liquid crystal display device is driven by a field sequential driving method.

48. A liquid crystal display device according to claim 16, the switching thin film transistor comprising a semiconductor layer over the substrate, having a first doped region and a second doped region,

wherein the consistency of the first doped region is lower than the second doped region.

68. An electronic device comprising the liquid crystal display device according to claim 16, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

17. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a pixel matrix circuit over the substrate, comprising a thin film transistor; and

a backlight comprising a light emitting diode,

wherein a channel forming region of the thin film transistor comprising a polycrystalline silicon, and

wherein the liquid crystal display device is driven by a field sequential driving method.

33. A liquid crystal device according to claim 17, wherein the light emitting diode is any one of a red light emitting diode, green light emitting diode and blue light emitting diode.

69. An electronic device comprising the liquid crystal display device according to claim 17, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

18. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a drive circuit over the substrate; and

a pixel matrix circuit over the substrate, comprising a thin film transistor; and

a backlight comprising a light emitting diode,

wherein a channel forming region of the thin film transistor comprising a polycrystalline silicon, and

wherein the liquid crystal display device is driven by a field sequential driving method.

34. A liquid crystal device according to claim 18, wherein the light emitting diode is any one of a red light emitting diode, green light emitting diode and blue light emitting diode.

70. An electronic device comprising the liquid crystal display device according to claim 18, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

19. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a pixel matrix circuit over the substrate, comprising a thin film transistor; and

an IC chip over the substrate; and

a backlight comprising a light emitting diode,

wherein a channel forming region of the thin film transistor comprising a polycrystalline silicon, and

wherein the liquid crystal display device is driven by a field sequential driving method.

35. A liquid crystal device according to claim 19, wherein the light emitting diode is any one of a red light emitting diode, green light emitting diode and blue light emitting diode.

71. An electronic device comprising the liquid crystal display device according to claim 19, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

20. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a drive circuit over the substrate; and

a pixel matrix circuit over the substrate, comprising a thin film transistor; and

an IC chip over the substrate; and

a backlight comprising a light emitting diode,

wherein a channel forming region of the thin film transistor comprising a polycrystalline silicon, and

wherein the liquid crystal display device is driven by a field sequential driving method.

36. A liquid crystal device according to claim 20, wherein the light emitting diode is any one of a red light emitting diode, green light emitting diode and blue light emitting diode.

72. An electronic device comprising the liquid crystal display device according to claim 20, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

21. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a pixel matrix circuit, comprising;

a switching thin film transistor over the substrate, having a first gate electrode and a second gate electrode;

a pixel electrode electrically connected to the switching thin film transistor; and

a gate line electrically connected to the first gate electrode and the second gate electrode; and

a backlight comprising a light emitting diode,

wherein a channel forming region of the switching thin film transistor comprising a polycrystalline silicon, and

wherein the liquid crystal display device is driven by a field sequential driving method.

37. A liquid crystal device according to claim 21, wherein the light emitting diode is any one of a red light emitting diode, green light emitting diode and blue light emitting diode.

49. A liquid crystal display device according to claim 21, the switching thin film transistor comprising a semiconductor layer over the substrate, having a first doped region and a second doped region,

wherein the consistency of the first doped region is lower than the second doped region.

73. An electronic device comprising the liquid crystal display device according to claim 21, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

22. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a drive circuit over the substrate;

a pixel matrix circuit, comprising;

a switching thin film transistor over the substrate, having a first gate electrode and a second gate electrode;

a pixel electrode electrically connected to the switching thin film transistor; and

a gate line electrically connected to the drive circuit, the first gate electrode and the second gate electrode; and

a backlight comprising a light emitting diode,

wherein a channel forming region of the switching thin film transistor comprising a polycrystalline silicon, and

wherein the liquid crystal display device is driven by a field sequential driving method.

38. A liquid crystal device according to claim 22, wherein the light emitting diode is any one of a red light emitting diode, green light emitting diode and blue light emitting diode.

50. A liquid crystal display device according to claim 22, the switching thin film transistor comprising a semiconductor layer over the substrate, having a first doped region and a second doped region,

wherein the consistency of the first doped region is lower than the second doped region.

74. An electronic device comprising the liquid crystal display device according to claim 22, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

23. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a pixel matrix circuit, comprising;

a switching thin film transistor over the substrate, having a first gate electrode and a second gate electrode;

a pixel electrode electrically connected to the switching thin film transistor; and

a gate line electrically connected to the first gate electrode and the second gate electrode;

an IC chip over the substrate; and

a backlight comprising a light emitting diode,

wherein a channel forming region of the switching thin film transistor comprising a polycrystalline silicon, and

wherein the liquid crystal display device is driven by a field sequential driving method.

39. A liquid crystal device according to claim 23, wherein the light emitting diode is any one of a red light emitting diode, green light emitting diode and blue light emitting diode.

51. A liquid crystal display device according to claim 23, the switching thin film transistor comprising a semiconductor layer over the substrate, having a first doped region and a second doped region,

wherein the consistency of the first doped region is lower than the second doped region.

75. An electronic device comprising the liquid crystal display device according to claim 23, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.

24. A liquid crystal display device comprising:

a liquid crystal panel comprising;

a substrate;

a drive circuit over the substrate;

a pixel matrix circuit, comprising;

a switching thin film transistor over the substrate, having a first gate electrode and a second gate electrode;

a pixel electrode electrically connected to the switching thin film transistor; and

a gate line electrically connected to the drive circuit, the first gate electrode and the second gate electrode;

an IC chip over the substrate; and

a backlight comprising a light emitting diode,

wherein a channel forming region of the switching thin film transistor comprising a polycrystalline silicon, and

wherein the liquid crystal display device is driven by a field sequential driving method.

40. A liquid crystal device according to claim 24, wherein the light emitting diode is any one of a red light emitting diode, green light emitting diode and blue light emitting diode.

52. A liquid crystal display device according to claim 24, the switching thin film transistor comprising a semiconductor layer over the substrate, having a first doped region and a second doped region,

wherein the consistency of the first doped region is lower than the second doped region.

76. An electronic device comprising the liquid crystal display device according to claim 24, wherein the electronic device is selected from the group consisting of digital a camera, a car navigation system, a personal computer, a mobile information terminal, a cellular phone.