MULTIPRIMARY COLOR DISPLAY WITH DYNAMIC GAMUT MAPPING

• US 20070279372A1
• Filed: 05/18/2007
• Published: 12/06/2007
• Est. Priority Date: 06/02/2006
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Clairvoyante, Inc. (Samsung Electronics Co. Ltd.)
• Inventors: Botzas, Anthony, Credelle, Thomas, Brown Elliott, Candice, Higgins, Micheal
• Granted Patent: US 7,592,996 B2
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2320/0238 Improving the black level
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/0653 Controlling or limiting the speed of brightness adjustment of the illumination source
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: G09G 5/06 using colour palettes, e.g. look-up tables

Abstract

The embodiments disclosed herein comprise a plurality of modules and means to provide effect dynamic gamut mapping and backlight control. In one embodiment, a display system comprises: a transmissive display, said display comprising a plurality of colored subpixels wherein one such colored subpixel is substantially wide spectrum bandpass; a transmissive display controller, said display controller providing signals to said transmissive display to set the amount of transmissivity of each said colored subpixel; a backlight, said backlight providing illumination to said transmissive display; a backlight controller, said controller providing signals to said backlight to modulate the amount of illumination provided by said backlight to said transmissive display; peak surveying module for surveying image data and extracting the image gamut hull for providing intermediate backlight data signals to said backlight controller to match said image gamut hull; and a means for normalizing display image data signals according to said intermediate backlight data signals and providing said normalized image data as intermediate display data.

Claims

1. A display system comprising:

a transmissive display, said display comprising a plurality of colored subpixels wherein one such colored subpixel is substantially wide spectrum bandpass;

a transmissive display controller, said display controller providing signals to said transmissive display to set the amount of transmissivity of each said colored subpixel;

a backlight, said backlight providing illumination to said transmissive display;

a backlight controller, said controller providing signals to said backlight to modulate the amount of illumination provided by said backlight to said transmissive display;

peak surveying module for surveying image data and extracting the image gamut hull for providing intermediate backlight data signals to said backlight controller to match said image gamut hull; and

a means for normalizing display image data signals according to said intermediate backlight data signals and providing said normalized image data as intermediate display data.

2. The display system as recited in claim 1 wherein said substantially wide spectrum bandpass color is one of a group, said group comprising:

white, grey, cyan, yellow, magenta.

3. The display system as recited in claim 1 wherein said backlight comprises one of a group, said group comprising:

CCFL, LEDs, OLED, EL.

4. The display system as recited in claim 3 wherein said backlight comprises a unitary backlight for the entire display area.

5. The display system as recited in claim 3 wherein said backlight comprises a partitioned backlight.

6. The display system as recited in claim 5 wherein said partitioned backlight comprises an array of LEDs.

7. The display system as recited in claim 5 wherein said array of LEDs comprises one of a group, said group comprising an array of white LEDs and an array of colored LEDs.

8. The display system as recited in claim 1 wherein said peak surveying module further comprises surveying image data over an entire frame and extracting the maximum luminance value over a set of color values.

9. The display system as recited in claim 8 wherein said system further comprises a last frame peak module for extracting the maximum luminance value from the previous frame of image data.

10. The display system as recited in claim 9 wherein said last frame peak module further comprises a means for displaying an image at least one frame behind the current image data input into said display system.

11. The display system as recited in claim 1 wherein said display system further comprises a pre-reduction module for reducing the image input data values by a desired amount to reduce the number of out of gamut image values in the input image data when rendered on said transmissive display.

12. The display system as recited in claim 11 wherein said desired amount may be an value from no reduction up to one half of the image input value.

13. The display system as recited in claim 11 wherein said desired amount is the amount of reduction needed to substantially eliminate any out of gamut values in the input image data when rendered upon said transmissive display.

14. The display system as recited in claim 11 wherein said desired amount is a function of the saturation of the input image data.

15. The display system as recited in claim 11 wherein said desired amount is a function of the saturation and the hue of the input image data.

16. The display system as recited in claim 11 wherein said desired amount is a function of the saturation of pre-determined priority colors.

17. The display system as recited in claim 16 wherein said priority colors are colors that are substantially bright saturated colors.

18. The display system as recited in claim 1 wherein said display system further comprises a subpixel rendering module, said subpixel rendering module comprising a means for detecting the saturation of pixels near a target pixel and, depending upon said saturation, selecting one of a group of appropriate subpixel rendering techniques.

19. The display system as recited in claim 18 wherein said group of appropriate subpixel rendering techniques comprises:

meta-luma sharpening, area resampling, same color sharpening.

20. The display system as recited in claim 1 wherein said display system further comprises a chromatic filtering module.

21. The display system as recited in claim 1 wherein said display system further comprises a means for selecting a group of modes, each said mode determining an operating curve of luminance versus saturation wherein each mode is selectable according to a number of operating conditions.

22. The display system as recited in claim 21 wherein said group of modes further comprises at least one of a group, said group comprises a normal mode, a normal mode with dimmed backlight power and a reduced simultaneous contrast mode.

23. The display system as recited in claim 21 wherein said number of operating conditions comprises at least one of a group, said group comprising:

user selection, application dependent selection, ambient light conditions.

24. The display system as recited in claim 21 wherein said modes operate by reduction of the luminance of the wide spectrum bandpass subpixel.

25. The display system as recited in claim 21 wherein said modes operate by reduction of the illumination of the backlight.

26. The display system as recited in claim 21 wherein said modes operated by reduction of the luminance of the wide spectrum bandpass subpixel and the illumination of the backlight.

27. The display system as recited in claim 1 wherein said display system further comprises a decay module for reducing the visual effect of a system comprising a fast responding backlight coupled with a slower responding display.

28. The display system as recited in claim 27 wherein said decay module operates said fast responding backlight on a slower operating curve.

29. The display system as recited in claim 27 wherein said decay module operates said slower responding display on a slower operating curve.

30. The display system as recited in claim 27 wherein said decay module operates said fast responding backlight on a slower operating curve and operates said slower responding display on a slower operating curve.