Four color arrangements of emitters for subpixel rendering

• US 20040051724A1
• Filed: 09/13/2002
• Published: 03/18/2004
• Est. Priority Date: 09/13/2002
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Thompson, Edward Eastle, Higgins, Michael Francis, Credelle, Thomas Lloyd, Elliott, Candice Hellen Brown
• Application Number:
  US10/243,094
• Publication Number:
  US 20040051724A1
• Time in Patent Office: Days
• US Class Current: 345/694
• 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 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• 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 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]

Abstract

Novel three-color and four-color subpixel arrangements and architectures for display and the like are herein disclosed. Novel techniques for subpixel rendering on the above subpixel arrangements are also herein disclosed.

Claims

1. An arrangement of at least three color subpixels, said at least three colors comprising a red and a green subpixel, said red and green subpixels comprising a red and a green filter respectively and further wherein said red and green subpixels comprise substantially the same luminance when the same energy level is applied to said red and green subpixels.

2. The arrangement as recited in claim 1 wherein said red subpixel filters comprise a more transmissive filter than said green subpixel filters.

3. The arrangement as recited in claim 2 wherein said red subpixel filters comprises one of a group, said group comprising:

a red filter comprising a physically thinner filter than said green filter;

a red filter comprising a red pigment comprising a reduced amount of pigment as compared to said green filter;

a red filter comprising a pigment comprising greater transmissivity of light than said green filter; and

a red filter comprising a broad transmissivity range of frequencies on either side of the red center point.

4. The arrangement as recited in claim 2 wherein said green subpixel filters comprises one of a group, said group comprising:

a green filter comprising a physically thicker filter than said red filter;

a green filter comprising a green pigment comprising a increased amount of pigment as compared to said red filter;

a green filter comprising a pigment comprising lesser transmissivity of light than said red filter; and

a green filter comprising a narrow transmissivity range of frequencies on either side of the green center point.

5. The arrangement as recited in claim 1 wherein the backlight comprises more frequencies in the red range.

6. The arrangement of claim 1 wherein said green subpixels comprises a green filter such that the pass band of said green filter is narrowed and such that the chromaticity of said green filter broadens the color gamut into a deeper green color.

7. The arrangement of claim 6 wherein said arrangement comprises at least a four color arrangement wherein said fourth color comprises a substantial amount of green color.

8. The arrangement of claim 7 wherein said fourth color comprises one of a group, said group comprising:

cyan, magenta, greenish-blue, and greenish-grey.

9. The arrangement of claim 8 wherein said arrangement comprises a repeat cell of four subpixels.

10. The arrangement of claim 7 wherein said arrangement comprises a repeat cell of at least six subpixels.

11. The arrangement of claim 10 wherein said arrangement comprises a repeat cell wherein said red and green subpixels further comprise a checkerboard pattern.

12. The arrangement of claim 1 wherein said arrangement comprises at least a four color arrangement wherein said fourth color comprises one of a group, said group comprising grey, blue grey, and filtered white.

13. The arrangement of claim 12 wherein the backlight comprises more energy in the blue spectrum than red or green spectrum.

14. An arrangement of four color subpixels, said arrangement comprising a red subpixel, a green subpixel, a cyan subpixel and a magenta subpixel such that when said red subpixel and said cyan subpixel are substantially fully on and when said green and said magenta subpixels are off, said arrangement displays a substantially white color.

15. An arrangement of four color subpixels, said arrangement comprising a red subpixel, a green subpixel, a cyan subpixel and a magenta subpixel such that when said green and said magenta subpixels are substantially fully on and when said red subpixel and said cyan subpixel are off, said arrangement displays a substantially white color.

16. An arrangement of at least six four-color subpixels, said arrangement comprising two red subpixels, two green subpixels, a blue subpixel and a fourth color subpixel such that said arrangement further comprises a first row and a second row, said first row comprising a red subpixel, a green subpixel and said blue subpixel, said second row comprising a red subpixel, a green subpixel and said fourth color subpixel.

17. The arrangement of claim 16 wherein further horizontally adjacent arrangements comprise a first row and a second row, said first row comprising a red subpixel, a green subpixel and said fourth color subpixel, said second row comprising a red subpixel, a green subpixel and said blue subpixel.

18. The arrangement of claim 16 wherein said subpixels comprise one of a group, said group comprising:

square subpixels and rectangular subpixels.

19. The arrangement of claim 16 wherein said red subpixels and said green subpixels form substantially a checkerboard pattern.

20. The arrangement of claim 18 wherein said blue subpixel and said fourth color subpixel are shifted out of alignment from said red subpixel and said green subpixel checkerboard pattern.

21. The arrangement of claim 19 wherein said blue subpixel and said fourth color subpixel are shifted out of alignment by substantially half the length of said subpixel.

22. The arrangement of claim 20 wherein horizontally adjacent arrangements comprise a first row and a second row, said first row comprising a red subpixel, a green subpixel and said fourth color subpixel, said second row comprising a red subpixel, a green subpixel and said blue subpixel.

23. The arrangement of claim 16 wherein said subpixels are comprised substantially of equal area.

24. The arrangement of claim 16 wherein said subpixels are not comprised substantially of equal area.

25. The arrangement of claim 24 wherein said fourth color subpixel comprises a smaller area than said blue subpixel.

26. An arrangement of at least six four-color subpixels, said arrangement comprising two red subpixels, two green subpixels, two two-color subpixels such that said arrangement further comprises a first row and a second row, said first row and said second row comprising a red subpixel, a green subpixel and a two-color subpixel.

27. The arrangement of claim 26 wherein said two-color subpixel comprises a filter, said filter further comprising a first color filter and a second color filter.

28. The arrangement of claim 27 wherein said first color filter comprises a larger area than said second color filter.

29. The arrangement of claim 28 wherein said second color filter comprises a filter of higher luminance than said first color filter.

30. The arrangement of claim 26 wherein horizontally-adjacent arrangements comprise a two-color filter rotated by 180 degrees.

31. An arrangement of at least six four-color subpixels, said arrangement comprising two red subpixels, two green subpixels, a third color subpixel and a two-color subpixels such that said arrangement further comprises a first row and a second row, said first row comprising a red subpixel, a green subpixel and the two-color subpixel.

32. The arrangement of claim 31 wherein a second adjacent arrangement comprises a first row and a second row, said first row comprising a red subpixel, a green subpixel and the third color subpixel.

33. An arrangement of five four-color subpixels, said arrangement comprising two red subpixels, two green subpixels, a two-color subpixel such that said arrangement further comprises a first column, a second column, and a third column, said first and third column comprising a red and green subpixel checkerboard and said second column comprising said two-color subpixel.

34. A method of converting a incoming pixel data of a first format comprising a plurality of four-color pixel elements for a display of a second format comprising a plurality of four-color pixel elements, the steps of said method comprising:

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

determining the resample area for each four-color subpixel in the display;

forming a set of coefficients for each said 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 said 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 said product to obtain luminance values for each resample area.

35. A method of converting a incoming pixel data of a first format comprising a plurality of three-color pixel elements for a display of a second format comprising a plurality of four-color pixel elements wherein said three-color input substantially matches three of the four colors in the display, the steps of said method comprising:

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

determining the resample area for each four-color subpixel in the display;

for each of the three matching colors in the display, forming a set of coefficients for each said resample area of the three matching colors in the display, said coefficients comprising actions whose denominators are a function of the resample area and the numerators are a function of an area of each said 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;

adding each said product to obtain luminance values for each resample area; and

for the fourth color in the display,

computing a luminance value for said fourth color, said fourth color luminance value comprising a function of computed luminance values of said matching three color display data.

36. The method as recited in claim 35 wherein said fourth color is one of a group, said group comprising white, grey, and blue-grey.

37. The method as recited in claim 36 wherein the step of computing a luminance value comprises computing the following function:

38. The method as recited in claim 35 wherein said fourth color comprises a combination of only two or said three matching colors.

39. The method as recited in claim 38 wherein said fourth color is one of a group, said group comprising blue-green and cyan.

40. The method as recited in claim 39 wherein said luminance value for said fourth color comprises:

41. The method as recited in claim 35 wherein said fourth-color subpixels comprise a resample area that does not cover the entire data space.