Image display system

• US 8,558,956 B2
• Filed: 12/30/2011
• Issued: 10/15/2013
• Est. Priority Date: 01/11/2011
• Status: Expired due to Fees

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Mizushima, Tetsuro, Teshima, Yoshihiro, Kitaoka, Yoshitaka, Ooie, Takayuki
• Primary Examiner(s): Natnael, Paulos M
• Application Number:
  US13/340,734
• Publication Number:
  US 20120176556A1
• Time in Patent Office: 655 Days
• Field of Search: 348/759, 348/760, 348/801, 348/761, 353 30- 34, 353/122, 353/20, 359/634, 359/663, 359/295
• US Class Current: 348/760
• CPC Class Codes: G06F 1/1639 the display being based on projection
• CPC Class Codes: G06F 1/1647 including at least an additional display G06F1/1692 takes precedence
• CPC Class Codes: H04N 9/3161 using laser light sources using laser beams scanning the display screen H04N9/3129
• CPC Class Codes: H04N 9/3164 using multiple light sources
• CPC Class Codes: H04N 9/3173 wherein the projection device is specially adapted for enhanced portability

Abstract

An image display system comprises red, green and blue laser light sources, a spatial light modulator that modulates the laser light of different colors in a time sharing manner and a controller that controls the operation of the laser light sources and the spatial light modulator. The green and red laser light sources are lit in this order in each frame. The green color is diminished due to the response delay of the spatial light modulator, but the green laser light produced by the green laser light source has a relatively large color phase shift from the standard green color so that the shortage of green color cancels the color phase shift of the generated green color so that the color phase shift of the displayed intermediate color can be minimized.

Claims

1. An image display system, comprising:

a red laser light source configured to emit red laser light;

a green laser light source configured to emit green laser light having a y value greater than standard green in the CIE xy color space chromaticity diagram;

a blue laser light source configured to emit blue laser light;

a spatial light modulator, comprising a single liquid crystal display, configured to modulate the red, green and blue laser light emitted from the respective laser light sources in a time sharing manner according to a video signal; and

a controller configured to control lighting of each laser light source during at least one lighting interval included in each video frame and to control an operation of the liquid crystal display;

wherein the controller is configured to light the green and red laser light sources in this order in each frame.

2. The image display system according to claim 1, wherein the controller is configured to light at least one of the red and green light sources more frequently than the blue laser light source in each frame.

3. The image display system according to claim 1, wherein the controller is configured to light the green, blue and green light sources in this order in each frame.

6. The image display system according to claim 1, wherein the green and red laser light sources are lit in that this order from an end of one frame to a beginning of a succeeding frame.

7. The image display system according to claim 1, wherein the y value of the green laser light is greater than 0.600 of the standard green.

8. The image display system according to claim 1, wherein a difference in y value between the green laser light and a standard green is greater than a difference in y value between the red laser light and a standard red, and is greater than a difference in y value between the blue laser light and a standard blue.

4. An image display system comprising:

a red laser light source configured to emit red laser light;

a green laser light source configured to emit green laser light having a relatively high y value in the CIE xy color space chromaticity diagram;

a blue laser light source configured to emit blue laser light;

a spatial light modulator configured to modulate the red, green and blue laser light emitted from the respective laser light sources in a time sharing manner according to a video signal; and

a controller configured to control lighting of each laser light source during at least one lighting interval included in each video frame and to control an operation of the spatial light modulator;

wherein the controller is configured to light the green and red laser light sources in this order in each frame, and

wherein each frame consists of an odd number of lighting intervals, and a polarity pattern of the spatial light modulator is reversed from one frame to another.

9. The image display system according to claim 4, wherein the y value of the green laser light is greater than 0.600 of the standard green.

5. An image display system comprising:

a red laser light source configured to emit red laser light;

a green laser light source configured to emit green laser light having a relatively high y value in the CIE xy color space chromaticity diagram;

a blue laser light source configured to emit blue laser light;

a spatial light modulator configured to modulate the red, green and blue laser light emitted from the respective laser light sources in a time sharing manner according to a video signal; and

a controller configured to control lighting of each laser light source during at least one lighting interval included in each video frame and to control an operation of the spatial light modulator;

wherein the controller is configured to light the green and red laser light sources in this order in each frame, and

wherein the green laser light source unit comprises a semiconductor laser that generates an excitation laser light, a solid laser device that generates an infrared laser light by being excited by the excitation laser light generated by the semiconductor laser and a wavelength converter that converts the infrared laser light generated by the solid laser device into green laser light.

10. The image display system according to claim 5, wherein the y value of the green laser light is greater than 0.600 of the standard green.