Color flat panel display sub-pixel arrangements and layouts for sub-pixel rendering with split blue sub-pixels

• US 7,417,648 B2
• Filed: 10/22/2002
• Issued: 08/26/2008
• Est. Priority Date: 01/07/2002
• Status: Expired due to Term

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Credelle, Thomas Lloyd
• Primary Examiner(s): CHANG, KENT WU
• Application Number:
  US10/278,352
• Publication Number:
  US 20030128179A1
• Time in Patent Office: 2,135 Days
• Field of Search: 345/72, 345/83, 345/88, 345/92, 345204-205, 345/209, 345/96, 345/690, 345/172, 345/694, 349106-109
• 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 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 octal grouping are disclosed. The octal grouping may comprise three-color (red, green and blue) sub-pixels with blue colored subpixel comprising twice the number of positions within the octal sub-pixel grouping as the red and green colored sub-pixels. Various embodiments for performing sub-pixel rendering on the sub-pixel groupings are disclosed.

Claims

1. An electronic display device comprising a plurality of a sub-pixel group;

said sub-pixel group further comprising eight sub-pixels disposed in two rows;

wherein each said sub-pixel is one of a red color sub-pixel, a green color sub-pixel and a blue color sub-pixel;

wherein said sub-pixel group further comprises four sub-pixels of said blue color, two sub-pixels of said red color and two sub-pixels of said green color;

wherein further said sub-pixels of said red color and said sub-pixels of said green color form substantially a checkerboard pattern in said two rows such that a red sub-pixel is followed by a green sub-pixel in one of said first and second rows of said sub-pixel group, and a green sub-pixel is followed by a red sub-pixel in the other of said first and second rows of said sub-pixel group.

2. The electronic display device as recited in claim 1 wherein said sub-pixels of said blue color comprises a smaller area than said sub-pixels of said red color and said green color.

3. The electronic display device as recited in claim 1 wherein said eight sub-pixels of said sub-pixel group disposed in two rows further comprise four columns of sub-pixels;

and

wherein further a first set of two non-adjacent columns comprise four sub-pixels of said blue color and a second set of two non-adjacent columns comprise two sub-pixels of said red color and two sub-pixels of said green color.

4. The electronic display device as recited in claim 3 wherein said two non-adjacent columns comprising four sub-pixels of said blue color are offset vertically from said two non-adjacent columns comprising two sub-pixels of said red color and two sub-pixels of said green color.

5. The electronic display device as recited in claim 1 wherein said sub-pixels of said blue color are interspersed among said substantially formed checkerboard pattern of sub-pixels of said red color and said green color.

6. The electronic display device as recited in claim 1 wherein said display device is an active matrix liquid crystal display.

7. The electronic display device as recited in claim 6 wherein driver circuitry of said display device applies a polarity scheme when driving the sub-pixels in each sub-pixel group.

8. The electronic display device as recited in claim 7 wherein said polarity scheme is a 1×

1 dot inversion polarity scheme.

9. The electronic display device as recited in claim 7 wherein said polarity scheme is a 2×

1 dot inversion polarity scheme.

10. A method of converting incoming three-color pixel data of a first format for rendering onto an electronic display device, said electronic display device comprising a plurality of a sub-pixel group;

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

wherein each said sub-pixel is one of a blue color sub-pixel, a red color sub-pixel and a green color sub-pixel;

wherein said sub-pixel group further comprises four sub-pixels of said blue color, two sub-pixels of said red color and two sub-pixels of said green color;

wherein further said sub-pixels of said red color and said sub-pixels of said green color form substantially a checkerboard pattern in said two rows such that a red sub-pixel is followed by a green sub-pixel in one of said first and second rows of said sub-pixel group, and a green sub-pixel is followed by a red sub-pixel in the other of said first and second rows of said sub-pixel group;

the steps of said method comprising;

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

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

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

multiplying values of said incoming three-color pixel data for each implied sample area by a coefficient resulting in a product; and

adding each product to obtain a luminance value for each resample area.

11. The method as recited in claim 10 wherein resample areas for same color sub-pixels form a resample area array;

and wherein the method further comprises;

determining a phase relationship among the resample area arrays.

12. The method as recited in claim 11 wherein each resample area array includes resample points, and wherein determining the phase relationship further comprises:

overlaying said resample area arrays by positioning said resample points such that the resample points for said red color and said green color substantially overlay the resample points for said blue color.

13. A system comprising:

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

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

wherein each said sub-pixel is one of a blue color sub-pixel, a red color sub-pixel and a green color sub-pixel;

wherein said sub-pixel group further comprises four sub-pixels of said blue color, two sub-pixels of said red color and two sub-pixels of said green color;

wherein further said sub-pixels of said red color and said sub-pixels of said green color form substantially a checkerboard pattern in said two rows such that a red sub-pixel is followed by a green sub-pixel in one of said first and second rows of said sub-pixel group, and a green sub-pixel is followed by a red sub-pixel in the other of said first and second rows of said sub-pixel group; and

means for subpixel rendering input image data.

14. The system as recited in claim 13 wherein said means for subpixel rendering input data further comprises:

means for inputting a set of color image data;

means for testing the input data for a plurality of conditions wherein one of said conditions comprises testing for the presence of high spatial frequency features in the input data; and

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

15. The system as recited in claim 14 wherein said set of color image input data comprises a sample of a 1×

3 matrix of input data.

16. The system as recited in claim 14 wherein said set of color image input data comprises a sample of a 1×

2 matrix of input data.

17. The system as recited in claim 14 wherein said high spatial frequency feature comprises one of a group, said group comprising an edge, a line, and a dot.

18. The system as recited in claim 14 wherein means for taking appropriate actions in response to the outcome of said testing of the input data further comprises:

means for substituting a new color data value for a current color data value.

19. The system as recited in claim 14 wherein means for taking appropriate actions in response to the outcome of said testing of the input data further comprises:

means for applying gamma correction to a current color data value.

20. The system as recited in claim 14 wherein means for taking appropriate actions in response to the outcome of said testing of the input data further comprises:

means for applying new sub-pixel rendering filter coefficients to the input data.

21. The system as recited in claim 13 wherein said means for subpixel rendering input data further comprises:

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

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

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

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

means for adding each product to obtain a luminance value for each resample area.