Subpixel rendering filters for high brightness subpixel layouts

• US 20050225563A1
• Filed: 04/09/2004
• Published: 10/13/2005
• Est. Priority Date: 04/09/2004
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Clairvoyante, Inc. (Samsung Electronics Co. Ltd.)
• Inventors: Higgins, Michael Francis, Brown Elliott, Candice Hellen
• Granted Patent: US 7,248,268 B2
• Time in Patent Office: Days
• US Class Current: 345/604
• 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 2340/0457 Improvement of perceived resolution by subpixel rendering
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607
• CPC Class Codes: H04N 1/58 Edge or detail enhancement; Noise or error suppression, e.g. colour misregistration correction H04N1/62 takes precedence

Abstract

The present application discloses several methods, techniques and systems for rendering source image data onto high brightness subpixel arrangements—for example, RGBW display panels. Additionally, these techniques have application for rendering data onto 3-color displays as well.

Claims

1. In a display, said display substantially comprising a subpixel repeating group, said group further comprising at least one white subpixel and a plurality of colored subpixels, a method for rendering image data of a first color space onto said display of a second color space, the steps of said method comprising:

inputting image data to be rendered on said display;

converting said image data from said first color space to image data of said second color space;

subpixel rendering each individual color plane.

2. The method of claim 1 wherein said first color space is one of a group, said group comprising:

RGB, sRGB, and YCbCr.

3. The method of claim 2 wherein said second color space is one of a group, said group comprising:

RGBW, RGBW+L, RGBCW+L, RGBMW+L.

4. The method of claim 1 wherein the step of subpixel rendering further comprises constructing filter kernals from area resampling.

5. The method of claim 4 wherein said step of constructing filter kernals further comprises mapping luminance image data onto said white subpixels.

6. The method of claim 4 wherein the step of subpixel rendering further comprises mapping the chrominance data onto said plurality of colored subpixels.

7. The method of claim 6 wherein the step of mapping the chrominance data onto said plurality of colored subpixels further comprises shifting the phase of at least one color plane to interstitial positions of said colored subpixels.

8. The method of claim 6 wherein the step of mapping the chrominance data onto said plurality of colored subpixels further comprises sharpening at least one color plane with lumininance data.

9. The method of claim 8 wherein the step of sharpening at least one color plane with luminance data further comprising sharpening with a difference of gaussian filter.

10. The method of claim 6 wherein the step of mapping the chrominance data onto said plurality of colored subpixels further comprises cross-color sharpening said chrominance data.

11. The method of claim 6 wherein the step of mapping the chrominance data onto said plurality of colored subpixels further comprises self-sharpening.

12. The method of claim 5 wherein said step of mapping luminance image data onto said white subpixels comprises one of a group, said group comprising:

tent filter, box filter, unity filter, box-cubic filter, tent-cubic filter.

13. The method of claim 4 wherein the step of constructing filter kernals from area resampling further comprises finding a reduced set of filters according to reconstruction symmetries.

14. The method of claim 13 wherein the step of find a reduced set of filters further comprises applying corrections for offset positions.