Color display system

• US 8,643,681 B2
• Filed: 03/01/2008
• Issued: 02/04/2014
• Est. Priority Date: 03/02/2007
• Status: Active Grant

• Current Assignee: Ignite USA (Ignite)
• Original Assignee: Olympus Corporation, Silicon Quest Kabushiki-Kaisha
• Inventors: Endo, Taro, Ishii, Fusao, Maeda, Yoshihiro, Ichikawa, Hirotoshi, Nishino, Hirokazu
• Primary Examiner(s): Sitta, Grant
• Application Number:
  US12/074,094
• Publication Number:
  US 20080218537A1
• Time in Patent Office: 2,166 Days
• Field of Search: 345/102, 345/204, 345/87
• US Class Current: 345/690
• CPC Class Codes: H04N 9/3111 for displaying the colours sequentially, e.g. by using sequentially activated light sources sequential projection in colour photography G03B33/08
• CPC Class Codes: H04N 9/312 Driving therefor driving of electronic spatial light modulators in displays other than projection devices G09G3/34, G09G3/36; control of liquid crystal elements G02F1/133; control of micromechanical modulators G02B26/08
• CPC Class Codes: H04N 9/3155 for controlling the light source light source control per se H05B35/00 – H05B47/00; control of an illumination source for displays in general G09G3/3406
• CPC Class Codes: H04N 9/3164 using multiple light sources

Abstract

A color display device including: at least one spatial light modulation element forming a display picture by modulated light obtained by modulating illumination light, a color sequential light generation device changing in a time series the illumination light or the modulated light into multiple groups of different color lights in one frame of a display period of the display picture, a control device controlling the spatial light modulator, and a color sequential light generation device based on the input picture data. The control device controls the spatial light modulator and the color sequential light generation device to change the ratio of the display time of each color of the reflected light time-shared in the display period of the frame depending on the character and/or the set value of the input picture data.

Claims

1. A color display device, comprising:

an illumination device comprising a plurality of laser light sources or light emitting diode (LED) light sources for generating an illumination light of a plurality of different colors;

at least one spatial light modulator modulates said illumination light for forming a display image; and

a control device analyzes an input image data for determining a first and second primary colors contained in successive frames necessary for increasing and decreasing levels of gray scale respectively and the control device further includes a data converter for converting at least a portion of the input image data into non-binary data bits and assigning each data bit with an equal weight for controlling said spatial light modulator and said illumination device by applying said input image data with said non-binary data bits assigned with said equal weight and change, according to a set of more flexible non-binary ratios as analyzed by the control device, a light emission intensity of said first and second primary colors of said illumination light emitted from the illumination device to increase and decrease the levels of gray scale of said first and second primary colors respectively.

2. The color display device according to claim 1, wherein:

said control device analyzes the input image data of a plurality of selected image display areas to change, according to the set of more flexible non-binary ratios as analyzed by the control device, the light emission intensity of said first and second primary colors of said illumination light emitted from the illumination device for the selected image display areas.

3. The color display device according to claim 1, wherein:

said control device further controls a frame period of the color display device based on a flexibly adjustable frequency between 50Hz and 360 Hz.

4. he color display device according to claim 1, wherein:

said control device further analyzes the input image data for determining a color balance requirement to control said illumination device to change, according to the set of more flexible non-binary ratios as analyzed by the control device, said illumination light emitted from said plurality of laser light sources or light emitting diode (LED) light sources.

5. The color display device according to claim 1, wherein:

said control device further analyzes the input image data for determining a pulse emission requirement for each color to control, according to the set of more flexible non-binary ratios as analyzed by the control device, said light emission of different colors emitted from said laser light sources or light emitting diode (LED) light sources.

6. The color display device according to claim 1, wherein:

said control device further analyzes the input image data for determining a cycle of pulse emission requirement for each color to control, according to the set of more flexible non-binary ratios as analyzed by the control device, said light emission of different colors from said laser light sources or light emitting diode (LED) light sources.

7. The color display device according to claim 1, wherein:

said control device further analyzes and applies the input image data to control, according to the set of more flexible non-binary ratios as analyzed by the control device, said laser light sources or light emitting diode (LED) light sources to emit the illumination light of different color as pulsed emissions each with a controlled pulse width.

8. The color display device according to claim 1, wherein:

said control device further comprises a frame memory for storing a plurality of successive frames of said input image data and continuously and periodically updates said input image data stored in said frame memory after a predetermined number of frames are projected.

9. The color display device according to claim 1, wherein:

said control device generating a control signal to control said spatial light modulator wherein said control signal comprises a series of bits wherein at least some of the bits are the non-binary data bits each assigned with the equal weight to control, according to the set of more flexible non-binary ratios as analyzed by the control device, said spatial light modulator in each of color subframes within said frame period.

10. The color display device according to claim 1, wherein:

said control device controls said illumination device to adjust said light emission intensity of said illumination light of said first and second primary colors corresponding to a change of said ratio of said display time constituting one of the set of more flexible non-binary ratios as analyzed by the control device and maintaining a same brightness of an image displayed by the color display device.

11. The color display device according to claim 1, wherein:

said spatial light modulator comprising a plurality of micromirrors, and said control device control each of said micromirrors to operate in an ON state, and an OFF state.

12. The color display device according to claim 1, wherein:

said spatial light modulator comprising a plurality of micromirrors, and said control device control each of said micromirrors to operate in an ON state, an OFF state and a partially-ON state; and

said control device generates a modulation control signal to change a combination of said ON state, said OFF state and said partially-ON state depending on said set of more flexible non-binary ratios as analyzed by the control device for controlling a display time of each color in said frame period.

13. A color display device, comprising:

an illumination device comprising a plurality of laser light sources or light emitting diode (LED) for generating an illumination light of a plurality of different colors;

at least one spatial light modulator forming a display image by a modulated light obtained by modulating an illumination light; and

a control device controlling said spatial light modulator and said illumination device based on an input image data, wherein the control device further includes a data converter for converting at least a portion of the input image data into non-binary data bits and assigning each data bit with an equal weight; and

said control device applying said input image data with said non-binary data bits assigned with said equal weight to control said spatial light modulator and said illumination device by applying said input image data with said non-binary data bits assigned with said equal weight to change, according to a set of more flexible non-binary ratios as analyzed by the control device, a display time of each color of said illumination light in a frame period by analyzing variation characteristics of multiple frames of said input image data, and controls a drive circuit of said illumination device to change, according to the set of more flexible non-binary ratios as analyzed by the control device, a light emission flux during a sub-frame for displaying a color emitted from the illumination device.

14. The color display device according to claim 13, wherein:

said control device further analyzes the input image data for determining a color balance requirement to control said illumination device to change, according to the set of more flexible non-binary ratios as analyzed by the control device, a modulation of at least two colors of said illumination light emitted from said plurality of light sources.

15. The color display device according to claim 13, wherein:

said control device further analyzes the input image data for determining a color balance requirement to control said illumination device to change, according to the set of more flexible non-binary ratios as analyzed by the control device, the light emission intensities of at least two colors of said illumination light emitted from said plurality of laser light sources or light emitting diode (LED).

16. The color display device according to claim 13, wherein:

said control device controls said spatial light modulator and said illumination device according to a set of more flexible non-binary ratios as analyzed by the control device to adjust a number of gray scale levels of a color light corresponding to said ratio of display time of each color within the display frame whereby each color is projected in a sub-frame having an adjustable number of gray scale levels adjustable to be different from another color displayed in another sub-frame within the display frame period.