Light Source Device for Display Device, Display Device, and Method for Adjusting Image of Display Device

• US 20080143976A1
• Filed: 02/28/2006
• Published: 06/19/2008
• Est. Priority Date: 03/01/2005
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Yokoyama, Toshifumi, Kasazumi, Ken'ichi
• Granted Patent: US 7,922,336 B2
• Time in Patent Office: Days
• US Class Current: 353/69
• CPC Class Codes: G03B 21/10 Projectors with built-in or built-on screen
• CPC Class Codes: G03B 21/2033 LED or laser light sources
• CPC Class Codes: G03B 21/208 Homogenising, shaping of the illumination light
• CPC Class Codes: G03B 21/28 Reflectors in projection beam in illumination beam G03B21/2066
• CPC Class Codes: H04N 5/7408 Direct viewing projectors, e.g. an image displayed on a video CRT or LCD display being projected on a screen
• CPC Class Codes: H04N 9/3141 Constructional details thereof details not peculiar to the presence of an electronic spatial light modulator G03B21/14
• CPC Class Codes: H04N 9/3191 Testing thereof testing of displays in general G09G3/006

Abstract

A light source device for display device for projecting an image on a screen is provided, the light source device for display device including a light source unit operable to output light; an image outputting unit operable to output an image by giving an image signal to the light; and a control circuit operable to switch the image output from the image outputting unit between a normal image and a mirror reversed image formed by reversing the normal image right and left by controlling the image signal, such that outputting type is switched between a front projection in which the image is projected onto the screen from a front on the same side as the viewing side, and a rear projection in which the image is projected onto the screen from a rear plane on the opposite side to the viewing side.

Claims

1-28. -28. (canceled)

29. A light source device for display device for projecting an image on a screen, the light source device comprising:

a light source unit operable to output light;

an image outputting unit operable to output an image by giving an image signal to the light; and

a control circuit operable to switch the image output from the image outputting unit between a normal image and a mirror reversed image formed by reversing the normal image right and left by controlling the image signal, such that outputting type is switched between a front projection in which the image is projected onto the screen from a front on the same side as the viewing side, and a rear projection in which the image is projected onto the screen from a rear on the opposite side to the viewing side,

wherein the control circuit switches the projecting light output according to projection type between front projection and rear projection.

30. The light source device for display device according to claim 29, further comprising a projecting unit operable to project the normal image or the mirror reversed image output from the image outputting unit onto the screen.

31. The light source device for display device according to claim 29, wherein the control circuit further includes a switch operable to switch between front projection and rear projection.

32. The light source device for display device according to claim 31, wherein the control circuit outputs the normal image or the mirror reversed image from the image outputting unit in response to the state of the switch.

33. The light source device for display device according to claim 29, wherein the control circuit performs trapezoidal correction or image adjustment in the vertical and horizontal directions on the image to be projected onto the screen by controlling the image signal given at the image outputting unit.

34. The light source device for display device according to claim 29, wherein the control circuit switches the projecting light output according to the surrounding brightness.

35. The light source device for display device according to claim 29, wherein the light source unit includes a semiconductor laser.

36. The light source device for display device according to claim 35, wherein high frequency superposition is applied to the semiconductor laser.

37. The light source device for display device according to claim 35, wherein the semiconductor laser is a self exciting type semiconductor laser.

38. The light source device for display device according to claim 29, further comprising a voice outputting unit operable to output voice.

39. The light source device for display device according to claim 29, further comprising a communication unit.

40. The light source device for display device according to claim 29, wherein the control circuit outputs a monochromatic pattern signal.

41. The light source device for display device according to claim 29, wherein the control circuit outputs an image pattern signal for notifying critical situation in time of disaster.

42. The light source device for display device according to claim 29, further comprising a drive battery.

43. The light source device for display device according to claim 42, wherein the control circuit switches the light output according to the remaining amount of the battery when used as the front projection type.

44. A display device comprising:

the light source device according to claim 29; and

a screen operable to display an image projected from the light source device.

45. The display device according to claim 44, further comprising a positioning unit operable to position a relative position of the light source device and the screen.

46. The display device according to claim 44, wherein the screen includes a reflecting part operable to reflect the image from the light source device.

47. The display device according to claim 46, wherein the reflecting part is arranged at an outermost periphery of the screen.

48. The display device according to claim 47, wherein the image outputting unit of the light source device outputs an image adjusting pattern with an image adjustment signal given to the outermost periphery of the image from the image outputting unit.

49. The display device according to claim 48, wherein the light source device further includes a light receiving unit operable to receive light reflected from the reflecting part of the screen, wherein

the control circuit performs image adjustment of the image adjusting pattern output from the image outputting unit according to the reflected light received by the light receiving unit.

50. The display device according to claim 44, wherein the switch of the light source device recognizes the display device when the light source device is incorporated as a component of the display device, and switches various settings.

51. The display device according to claim 50, wherein outputting type of the light source device is switched between front projection and rear projection according to the display device by the switch.

52. The display device according to claim 44, further comprising an input keyboard.

53. The display device according to claim 44, further comprising a charging unit operable to charge the light source device.

54. An image adjustment method for adjusting the image projected on a screen in the display device according to claim 46, the method comprising:

outputting an image adjusting pattern with an image adjustment signal given only to the outermost peripheral portion of the image from the image outputting unit of the light source device;

receiving a reflected light of the image adjusting pattern reflected from a reflecting part of the screen;

performing image adjustment of the image adjusting pattern according to the received reflected light; and

repeating from the step of outputting the image adjusting pattern to the step of performing the image adjustment, until the image adjustment is within the acceptable range.

55. The image adjustment method of the display device according to claim 54, wherein the image adjustment signal pattern is a square pattern.