Methods and systems for sub-pixel rendering with adaptive filtering

• US 20030085906A1
• Filed: 08/08/2002
• Published: 05/08/2003
• Est. Priority Date: 05/09/2001
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: ClairVoyante Laboratories, Inc.
• Inventors: Credelle, Thomas Lloyd, Higgins, Paul, Elliott, Candice Hellen Brown
• Granted Patent: US 7,184,066 B2
• Time in Patent Office: Days
• US Class Current: 345/613
• 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 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 2340/0414 Vertical resolution change
• CPC Class Codes: G09G 2340/0421 Horizontal resolution change
• CPC Class Codes: G09G 2340/0457 Improvement of perceived resolution by subpixel rendering
• CPC Class Codes: G09G 2340/0492 Change of orientation of the displayed image, e.g. upside-down, mirrored
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/2044 using dithering
• 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 5/005 Adapting incoming signals to the display format of the display terminal
• CPC Class Codes: G09G 5/006 Details of the interface to the display terminal specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04
• 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

Abstract

Processing data for a display including pixels, each pixel having color sub-pixels, comprises receiving pixel data. Once the pixel data is received, processing data for a display includes converting the pixel data to sub-pixel rendered data, the conversion generating the sub-pixel rendered data for a sub-pixel arrangement including alternating red and green sub-pixels on at least one of a horizontal and vertical axis. Next processing data for a display includes correcting the sub-pixel rendered data if a condition exists and outputting the sub-pixel rendered data.

Claims

1. A method for processing data for a display including pixels, each pixel having color sub-pixels, the method comprising:

receiving pixel data;

converting the pixel data to sub-pixel rendered data, the conversion generating the sub-pixel rendered data for a sub-pixel arrangement including alternating red and green sub-pixels on at least one of a horizontal and vertical axis;

correcting the sub-pixel rendered data if a condition exists; and

outputting the sub-pixel rendered data.

2. The method of claim 1, wherein correcting the sub-pixel rendered data further comprises applying at least one of a gamma adjustment, setting elements of the sub-pixel rendered data to a constant number, and applying a mathematical function to the sub-pixel rendered data.

3. The method of claim 1, wherein the condition comprises at least one of a white dot center, a white dot edge, a black dot center, a black dot edge, a white diagonal center-down, a white diagonal center-up, a white diagonal edge, a black diagonal center-down, a black diagonal center-up, a black diagonal edge, a vertical black shoulder, a horizontal black shoulder, a vertical white line shoulder, a horizontal white line shoulder, and a center white line.

4. The method of claim 3, wherein white comprises a sub-pixel intensity of greater than a first threshold.

5. The method of claim 4, wherein the first threshold is 90%.

6. The method of claim 3, wherein black comprises a sub-pixel intensity of less than a second threshold.

7. The method of claim 6, wherein the second threshold is 10%.

8. The method of claim 1, wherein the condition is detected in at least one of the pixel data and the sub-pixel rendered data.

9. The method of claim 1, wherein converting the pixel data to the sub-pixel rendered data further comprises applying a color balancing filter.

10. The method of claim 1, wherein at least one of the pixel data and the sub-pixel rendered data comprise an m by n matrix, wherein m and n are integers greater than 1.

11. The method of claim 1, wherein the condition is tested on a color by color basis.

12. The method of claim 1, wherein outputting the sub-pixel rendered data further comprises outputting the sub-pixel rendered data to a display.

13. The method of claim 1, wherein the condition is test on a color-by-color basis.

14. The method of claim 11, wherein blue sub-pixels are corrected based upon information regarding at least one of red sub-pixels and green sub-pixels.

15. A system for processing data for a display including pixels, each pixel having color sub-pixels, the system comprising:

a component for receiving pixel data;

a component for converting the pixel data to sub-pixel rendered data, the conversion generating the sub-pixel rendered data for a sub-pixel arrangement including alternating red and green sub-pixels on at least one of a horizontal and vertical axis;

a component for correcting the sub-pixel rendered data if a condition exists; and

a component for outputting the sub-pixel rendered data.

16. The system of claim 15, wherein the component for correcting the sub-pixel rendered data is further configured for applying at least one of a gamma adjustment, setting elements of the sub-pixel rendered data to a constant number, and applying a mathematical function to the sub-pixel rendered data.

17. The system of claim 15, wherein the condition comprises at least one of a white dot center, a white dot edge, a black dot center, a black dot edge, a white diagonal center-down, a white diagonal center-up, a white diagonal edge, a black diagonal center-down, a black diagonal center-up, a black diagonal edge, a vertical black shoulder, a horizontal black shoulder, a vertical white line shoulder, a horizontal white line shoulder, and a center white line.

18. The system of claim 17, wherein white comprises a sub-pixel intensity of greater than a first threshold.

19. The system of claim 18, wherein the first threshold is 90%.

20. The system of claim 17, wherein black comprises a sub-pixel intensity of less than a second threshold.

21. The system of claim 20, wherein the second threshold is 10%.

22. The system of claim 15, wherein the condition is detected in the pixel data.

23. The system of claim 15, wherein the component for converting the pixel data to the sub-pixel rendered data is further configured for applying a color balancing filter.

24. The system of claim 15, wherein at least one of the pixel data and the sub-pixel rendered data comprise an m by n matrix, wherein m and n are integers greater than 1.

25. The system of claim 15, wherein the condition is tested on a color by color basis.

26. The system of claim 15, wherein the component for outputting the sub-pixel rendered data is further configured for outputting the sub-pixel rendered data to a display.

27. The system of claim 15, wherein the condition is test on a color-by-color basis.

28. The system of claim 15, wherein blue sub-pixels are corrected based upon information regarding at least one of red sub-pixels and green sub-pixels.

29. A computer-readable medium on which is stored a set of instructions for processing data for a display including pixels, each pixel having color sub-pixels, which when executed perform stages comprising:

receiving pixel data;

converting the pixel data to sub-pixel rendered data, the conversion generating the sub-pixel rendered data for a sub-pixel arrangement including alternating red and green sub-pixels on at least one of a horizontal and vertical axis;

correcting the sub-pixel rendered data if a condition exists; and

outputting the sub-pixel rendered data.

30. The computer-readable medium of claim 29, wherein correcting the sub-pixel rendered data further comprises applying at least one of a gamma adjustment, setting elements of the sub-pixel rendered data to a constant number, and applying a mathematical function to the sub-pixel rendered data.

31. The computer-readable medium of claim 29, wherein the condition comprises at least one of a white dot center, a white dot edge, a black dot center, a black dot edge, a white diagonal center-down, a white diagonal center-up, a white diagonal edge, a black diagonal center-down, a black diagonal center-up, a black diagonal edge, a vertical black shoulder, a horizontal black shoulder, a vertical white line shoulder, a horizontal white line shoulder, and a center white line.

32. The computer-readable medium of claim 31, wherein white comprises a sub-pixel intensity of greater than a first threshold.

33. The computer-readable medium of claim 32, wherein the first threshold is 90%.

34. The computer-readable medium of claim 31, wherein black comprises a sub-pixel intensity of less than a second threshold.

35. The computer-readable medium of claim 34, wherein the second threshold is 10%.

36. The computer-readable medium of claim 29, wherein the condition is detected in at least one of the pixel data and the sub-pixel rendered data.

37. The computer-readable medium of claim 29, wherein converting the pixel data to the sub-pixel rendered data further comprises applying a color balancing filter.

38. The computer-readable medium of claim 29, wherein at least one of the pixel data and the sub-pixel rendered data comprise an m by n matrix, wherein m and n are integers greater than 1.

39. The computer-readable medium of claim 29, wherein the condition is tested on a color by color basis.

40. The computer-readable medium of claim 29, wherein outputting the sub-pixel rendered data further comprises outputting the sub-pixel rendered data to a display.

41. The computer-readable medium of claim 29, wherein the condition is test on a color-by-color basis.

42. The computer-readable medium of claim 29, wherein blue sub-pixels are corrected based upon information regarding at least one of red sub-pixels and green sub-pixels.

43. A method for processing data for a display including pixels, each pixel having color sub-pixels, the method comprising:

receiving pixel data;

converting the pixel data to sub-pixel rendered data, the conversion generating the sub-pixel rendered data for a sub-pixel arrangement including alternating red and green sub-pixels on at least one of a horizontal and vertical axis, wherein if at least one of a black horizontal line, a black vertical line, a white horizontal line, a white vertical line, a black edge, and a white edge is not detected in the pixel data, converting the pixel data to the sub-pixel rendered data includes applying a first color balancing filter, and wherein if an intensity of first color sub-pixels of the pixel data being converted and an intensity of second color sub-pixels of the pixel data being converted are not equal, converting the pixel data to the sub-pixel rendered data includes applying a second color balancing filter; and

outputting the sub-pixel rendered data.

44. The method of claim 43, wherein outputting the sub-pixel rendered data further comprises outputting the sub-pixel rendered data to a display.

45. The method of claim 43, wherein at least one of the pixel data and the sub-pixel rendered data comprise an m by n matrix, wherein m and n are integers greater than 1.

46. A system for processing data for a display including pixels, each pixel having color sub-pixels, the system comprising:

a component for receiving pixel data;

a component for converting the pixel data to sub-pixel rendered data, the conversion generating the sub-pixel rendered data for a sub-pixel arrangement including alternating red and green sub-pixels on at least one of a horizontal and vertical axis, wherein if at least one of a black horizontal line, a black vertical line, a white horizontal line, a white vertical line, a black edge, and a white edge is not detected in the pixel data, converting the pixel data to the sub-pixel rendered data includes applying a first color balancing filter, and wherein if an intensity of first color sub-pixels of the pixel data being converted and an intensity of second color sub-pixels of the pixel data being converted are not equal, converting the pixel data to the sub-pixel rendered data includes applying a second color balancing filter; and

a component for outputting the sub-pixel rendered data.

47. The system of claim 46, wherein the component for outputting the sub-pixel rendered data is further configure for outputting the sub-pixel rendered data to a display.

48. The system of claim 46, wherein at least one of the pixel data and the sub-pixel rendered data comprise an m by n matrix, wherein m and n are integers greater than 1.

49. A computer-readable medium on which is stored a set of instructions for processing data for a display including pixels, each pixel having color sub-pixels, which when executed perform stages comprising:

receiving pixel data;

converting the pixel data to sub-pixel rendered data, the conversion generating the sub-pixel rendered data for a sub-pixel arrangement including alternating red and green sub-pixels on at least one of a horizontal and vertical axis, wherein if at least one of a black horizontal line, a black vertical line, a white horizontal line, a white vertical line, a black edge, and a white edge is not detected in the pixel data, converting the pixel data to the sub-pixel rendered data includes applying a first color balancing filter, and wherein if an intensity of first color sub-pixels of the pixel data being converted and an intensity of second color sub-pixels of the pixel data being converted are not equal, converting the pixel data to the sub-pixel rendered data includes applying a second color balancing filter; and

outputting the sub-pixel rendered data.

50. The computer-readable medium of claim 49, wherein outputting the sub-pixel rendered data further comprises outputting the sub-pixel rendered data to a display.

51. The computer-readable medium of claim 49, wherein at least one of the pixel data and the sub-pixel rendered data comprise an m by n matrix, wherein m and n are integers greater than 1.