MULTIPRIMARY COLOR DISPLAY WITH DYNAMIC GAMUT MAPPING

• US 20090278867A1
• Filed: 07/16/2009
• Published: 11/12/2009
• Est. Priority Date: 06/02/2006
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Higgins, Michael Francis, Credelle, Thomas Lloyd, Botzas, Anthony, BROWN ELLIOTT, Candice Hellen
• Granted Patent: US 8,411,022 B2
• Time in Patent Office: Days
• US Class Current: 345/690
• 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 display panel comprising a subpixel group having a plurality of subpixels;

a backlight providing a light to the subpixels of the display panel;

a backlight controller providing backlight signals to the backlight to modulate the amount of the light provided by the backlight to the display panel;

a surveying module surveying image data and providing intermediate backlight signals to the backlight controller; and

a circuit modulating the image data according to the intermediate backlight signals and providing the modulated image data to the display panel.

2. The display system of claim 1, wherein the subpixel comprises substantially wide spectrum band pass color and substantially wide spectrum band pass color is one of a group comprising:

white, gray, cyan, yellow, magenta.

3. The display system of claim 1, wherein the surveying module further comprises surveying image data over an entire frame and extracting the maximum luminance value over a set of color values.

4. The display system of claim 3, the wherein the display system further comprises a last frame peak module extracting the maximum luminance value from the previous frame of image data.

5. The display system of claim 1, wherein the display system further comprises a pre-reduction module reducing the image data by a desired amount to reduce the number of out-of-gamut image data values in the image data.

6. The display system of claim 1, wherein the display system further comprises a subpixel rendering module detecting the saturation of pixels near a target pixel and, depending upon the saturation, selecting one of a group of appropriate subpixel rendering techniques.

7. The display system of claim 6, wherein the group of appropriate subpixel rendering techniques comprises:

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

8. The display system of claim 1, wherein the display system further comprises a chromatic filtering module.

9. The display system of claim 1, wherein the display system further comprises a selector selecting a group of modes wherein each mode is selectable according to a number of operating conditions.

10. The display system of claim 9, wherein the group of modes further comprises at least one of a group, the group comprises a normal mode, a normal mode with dimmed backlight power and a reduced simultaneous contrast mode.

11. The display system of claim 9, wherein the number of operating conditions comprises at least one of a group, the group comprising:

user selection, application dependent selection, ambient light conditions.

12. The display system of claim 9, wherein the modes operate by reduction of the luminance of the subpixels.

13. The display system of claim 9, wherein the modes operate by reduction of the illumination of the light provided by the backlight.

14. The display system of claim 1, wherein the display system further comprises a decay module decreasing illumination by the backlight as a curve comprising a series of steps with a decreasing amplitude.