Sub-pixel arrangements for striped displays and methods and systems for sub-pixel rendering same

• US 20040080479A1
• Filed: 01/16/2003
• Published: 04/29/2004
• Est. Priority Date: 10/22/2002
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Credelle, Thomas LIoyd
• Application Number:
  US10/347,001
• Publication Number:
  US 20040080479A1
• Time in Patent Office: Days
• US Class Current: 345/88
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/134345 Subdivided pixels, e.g. for grey scale or redundancy
• 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 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• 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 3/3614 Control of polarity reversal in general

Abstract

Various embodiments of a sub-pixel grouping are disclosed for displays comprised of color stripes. One embodiment comprises a quad grouping that further comprises three-color sub-pixels with one colored sub-pixel comprising twice the number of positions within the quad sub-pixel grouping as the other two colored sub-pixels. Various embodiments for performing sub-pixel rendering on the sub-pixel groupings are disclosed.

Claims

1. In a display comprising a plurality of color sub-pixels formed across said display to form a plurality of color stripes, said display further comprising a plurality of a repeating sub-pixel group;

said sub-pixel group further comprising four sub-pixels;

wherein each said sub-pixel is one of a first color sub-pixel, a second color sub-pixel and a third color sub-pixel;

wherein said sub-pixel group further comprises two sub-pixels of said first color, one sub-pixel of said second color and one sub-pixel of said third color; and

wherein said sub-pixels of each said first color, said second color and said third color each form substantially a color stripe.

2. The display as recited in claim 1 wherein said first color comprises a green color and each said second color and said third color comprises one of a red color and a blue color, respectively.

3. The display as recited in claim 1 wherein said first color comprises a red color and each said second color and said third color is one of a green color and a blue color, respectively.

4. The display as recited in claim 1 wherein said sub-pixels of said first color has a smaller area than said sub-pixels of said second color and said third color.

5. The display as recited in claim 1 where said sub-pixel group further comprises substantially one row and four columns of sub-pixels;

and

wherein a first set of two non-adjacent columns comprise two sub-pixels of said first color and a second set of two non-adjacent columns comprise one sub-pixel of said second color and one sub-pixel of said third color respectively.

6. The display as recited in claim 5 wherein at least one of said two non-adjacent columns comprising two sub-pixels of said first color are offset vertically from said two non-adjacent columns comprising one sub-pixels of said second color and one sub-pixels of said third color respectively

7. The display as recited in claim 1 wherein said display is one of a group, said group comprising Active Matrix Liquid Crystal Display (AMLCD), Passive Matrix Liquid Crystal Display (PMLCD), Liquid Crystal Display (LCD), Organic Light Emitting Diode (OLED), ElectroLumenscent (ELD), Field Emission (FED), Electrophoretic (EPD), Micro-Electro/Mechanical System (MEMS), flat matrix CRT, and plasma display.

8. The display as recited in claim 7 wherein one of said LCD type dispalys applies a dot inversion scheme for driving the sub-pixels in each sub-pixel group.

9. The display as recited in claim 8 wherein said dot inversion scheme is 1×

1 dot inversion.

10. The display as recited in claim 8 wherein said dot inversion scheme is 2×

1 dot inversion.

11. The display as recited in claim 8 wherein said display applies a line inversion scheme for driving the sub-pixels in each sub-pixel group.

12. The display as recited in claim 1 wherein said sub-pixels of said first color has a different dimension than said sub-pixels of said second color and said third color.

13. In a display, said display comprising a plurality of a repeating sub-pixel group;

said sub-pixel group further comprising four sub-pixels;

wherein each said sub-pixel is one of a first color sub-pixel, a second color sub-pixel and a third color sub-pixel;

wherein said sub-pixel group further comprises two sub-pixels of said first color, one sub-pixel of said second color and one sub-pixel of said third color;

wherein further said sub-pixels of said first color, said second color and said third color form substantially a plurality of color stripes across said display;

a method of converting a source pixel data of a first format for rendering onto said display comprising;

determining implied sample areas for each data point of incoming three-color pixel data;

determining the resample area for each color sub-pixel in the display;

forming a set of coefficients for each the resample area, said coefficients comprising fractions whose denominators are a function of the resample area and the numerators are a function of an area of each the implied sample areas that may partially overlap said resample areas;

multiplying the incoming pixel data for each implied sample area by the coefficient resulting in a product; and

adding each the product to obtain luminance values for each resample area.

14. The method as recited in claim 13 wherein determining the resample area further comprises:

determining a phase relationship between the resample area for each color sub-pixel.

15. The methods as recited in claim 14 wherein determining a phase relationship further comprises:

positioning resample points for each said color resample areas such that the resample points for said second color and said third color substantially overlay the resample points for said first color.

16. The method as recited in claim 13 wherein said first color is green, and said second and third colors are red and blue respectively;

wherein said green color plane conversion comprises a unity filter and the red and blue color plane use a 3×

3 filter coefficient matrix.

17. The method as recited in claim 16 wherein said green color plane comprises a unity filter centered to match substantially an input pixel by adjusting said filter with respect to the sub-pixel grid.

18. In a display, said display comprising a plurality of a repeating sub-pixel group;

said sub-pixel group further comprising four sub-pixels;

wherein each said sub-pixel is one of a first color sub-pixel, a second color sub-pixel and a third color sub-pixel;

wherein said sub-pixel group further comprises two sub-pixels of said first color, one sub-pixel of said second color and one sub-pixel of said third color;

wherein further said sub-pixels of said first color, second color and said sub-pixels of said third color form substantially a color stripe across said display;

a method of converting a source pixel data of a first format for rendering onto said display comprising;

inputting a set of color image data;

testing the input data for a plurality of conditions; and

taking appropriate actions in response to the outcome of said testing of the input data.

19. The method as recited in claim 18 wherein said set of color image input data comprises a sample of a 1×

3 matrix of input data.

20. The method as recited in claim 18 wherein said set of color image input data comprises a sample of a 1×

2 matrix of input data.

21. The method as recited in claim 18 wherein testing the input data for a plurality of conditions further comprises:

testing for the detection of a high contrast feature in the input data.

22. The method as recited in claim 21 wherein said high contrast feature comprises one of a group, said group comprising an edge, a line, and a dot.

23. The method as recited in claim 18 wherein taking appropriate actions in response to the outcome of said testing of the input data further comprises:

substitute a new color data value for the current color data value.

24. The method as recited in claim 18 wherein taking appropriate actions in response to the outcome of said testing of the input data further comprises:

apply gamma correction to the current color data value.

25. The method as recited in claim 18 wherein taking appropriate actions in response to the outcome of said testing of the input data further comprises:

apply new sub-pixel rendering filter coefficients to the input data.

26. A system comprising:

a display, said display comprising a plurality of a repeating sub-pixel group;

said sub-pixel group further comprising four sub-pixels;

wherein each said sub-pixel is one of a first color sub-pixel, a second color sub-pixel and a third color sub-pixel;

wherein said sub-pixel group further comprises two sub-pixels of said first color, one sub-pixel of said second color and one sub-pixel of said third color;

wherein further said sub-pixels of said first color, said second color and said third color form substantially a color stripe across said display; and

a processor for sub-pixel rendering input image data.

27. The system as recited in claim 26 wherein said processor is to input a set of color image data, test the input data for a plurality of conditions;

and take appropriate actions in response to the outcome of said testing of the input data.

28. The system as recited in claim 27 wherein said set of color image input data comprises a sample of a 1×

3 matrix of input data.

29. The system as recited in claim 27 wherein said set of color image input data comprises a sample of a 1×

2 matrix of input data.

30. The system as recited in claim 27 wherein said processor is to test for the detection of a high contrast feature in the input data.

31. The system as recited in claim 30 wherein said high contrast feature comprises one of a group, said group comprising an edge, a line, and a dot.

32. The system as recited in claim 27 wherein said processor is to substitute a new color data value for the current color data value.

33. The system as recited in claim 27 wherein said processor is to apply gamma correction to the current color data value.

34. The system as recited in claim 27 wherein said processor is to apply new sub-pixel rendering filter coefficients to the input data.

35. The system as recited in claim 26 wherein said processor is to determine implied sample areas for each data point of incoming three-color pixel data, to determine the resample area for each color sub-pixel in the display, to form a set of coefficients for each resample area, said coefficients comprising fractions whose denominators are a function of the resample area and the numerators are a function of an area of each of the implied sample areas that may partially overlap said resample areas, to multiply the incoming pixel data for each implied sample area by the coefficient resulting in a product, and to add each of the product to obtain luminance values for each resample area.

36. The system as recited in claim 35 wherein said processor is to determine a phase relationship between the resample area for each color sub-pixel.

37. The system as recited in claim 36 wherein said processor is to position resample points for each said color resample areas such that the resample points for said second color and said third color substantially overlay the resample points for said first color.

38. The system as recited in claim 35 wherein said first color is green, and said second and third colors are red and blue respectively;

and

wherein said green color plane conversion comprises a unity filter and the red and blue color plane use a 3×

3 filter coefficient matrix.

39. The system as recited in claim 38 wherein said green color plane comprises a unity filter centered to match substantially an input pixel by adjusting said filter with respect to the sub-pixel grid.

40. A computing device for converting a source pixel data of a first format for rendering on a display, said display comprising a plurality of a repeating sub-pixel group;

said sub-pixel group further comprising four sub-pixels;

wherein each said sub-pixel is one of a first color sub-pixel, a second color sub-pixel and a third color sub-pixel;

wherein said sub-pixel group further comprises two sub-pixels of said first color, one sub-pixel of said second color and one sub-pixel of said third color;

wherein further said sub-pixels of said first color, said second color and said third color form substantially a plurality of color stripes across said display, the computing device comprising;

a memory to store the source pixel data; and

a processor configured to;

determine implied sample areas for each data point of incoming three-color pixel data from the source pixel data,

determine the resample area for each color sub-pixel in the display,

form a set of coefficients for each the resample area, said coefficients comprising fractions whose denominators are a function of the resample area and the numerators are a function of an area of each the implied sample areas that may partially overlap said resample areas,

multiply the incoming pixel data for each implied sample area by the coefficient resulting in a product, and

add each the product to obtain luminance values for each resample area.

41. A computing device for converting a source pixel data of a first format for rendering on a display, said display comprising a plurality of a repeating sub-pixel group;

said sub-pixel group further comprising four sub-pixels;

wherein each said sub-pixel is one of a first color sub-pixel, a second color sub-pixel and a third color sub-pixel;

wherein said sub-pixel group further comprises two sub-pixels of said first color, one sub-pixel of said second color and one sub-pixel of said third color;

wherein further said sub-pixels of said first color, second color and said sub-pixels of said third color form substantially a color stripe across said display, the computing device comprising;

a memory to store the source pixel data;

a processor configured to;

input a set of color image data from the source pixel data,

test the inputted data for a plurality of conditions, and

take appropriate actions in response to the outcome of said testing of the inputted data.