Display device having edge determiner and subpixel renderer and method of driving the same

Patent metadata

Field	Value
Publication number	US-11699370-B2
Application number	US-202217837782-A
Country	US
Kind code	B2
Filing date	Jun 10, 2022
Priority date	Sep 10, 2021
Publication date	Jul 11, 2023
Grant date	Jul 11, 2023

Abstract

A display device includes a display panel and an image processor. The display panel includes pixels, each pixel among the pixels including sub-pixels. The image processor is configured to process image data for image display via the display panel. An arrangement of sub-pixels of a pixel in an odd-numbered pixel column of the display panel is different from an arrangement of sub-pixels of a pixel in an even-numbered pixel column of the display panel. The image processor includes an edge determiner and a sub-pixel renderer. The edge determiner is configured to determine an edge from the image data. The sub-pixel renderer is configured to perform sub-pixel rendering on pixel data about sub-pixels configured to display a same color in adjacent pixels in the odd-numbered pixel column or the even-numbered pixel column located at the edge.

First claim

What is claimed is:

1. A display device comprising:
a display panel comprising pixels, each pixel among the pixels comprising sub-pixels; and
an image processor configured to process image data for image display via the display panel,
wherein an arrangement of sub-pixels of a pixel in an odd-numbered pixel column of the display panel is different from an arrangement of sub-pixels of a pixel in an even-numbered pixel column of the display panel such that a pixel in the even-numbered pixel column and one pixel row of the display panel is shifted from a pixel in the odd-numbered pixel column and the pixel row in a vertical direction, and
wherein the image processor comprises:
an edge determiner configured to determine an edge from the image data; and
a sub-pixel renderer configured to perform sub-pixel rendering on pixel data about sub-pixels configured to display a same color in adjacent pixels in the odd-numbered pixel column or the even-numbered pixel column located at the edge.

2. The display device of claim 1 , wherein each pixel among the pixels comprises:
a first sub-pixel configured to display a red color;
a second sub-pixel configured to display a green color; and
a third sub-pixel configured to display a blue color.

3. The display device of claim 2 , wherein the sub-pixel renderer is configured to perform the sub-pixel rendering on pixel data about second sub-pixels of the adjacent pixels in the odd-numbered pixel column or the even-numbered pixel column located at the edge.

4. The display device of claim 2 , wherein:
the second sub-pixel is shifted from the first sub-pixel in a vertical direction; and
the third sub-pixel is parallel to the first sub-pixel in the vertical direction.

5. The display device of claim 2 , wherein a distance between a second sub-pixel of a pixel in the odd-numbered pixel column and an n th pixel row (where n is a natural number) and a second sub-pixel of a pixel in the even-numbered pixel column and the n th pixel row in a vertical direction is greater than a distance between the second sub-pixel of the pixel in the odd-numbered pixel column and the n th pixel row and a second sub-pixel of a pixel in the even-numbered pixel column and an (n−1) th pixel row in the vertical direction.

6. The display device of claim 1 , wherein the arrangement of the sub-pixels of the pixel in the odd-numbered pixel column and the arrangement of the sub-pixels of the pixel in the even-numbered pixel column are axisymmetric with respect to a horizontal direction.

7. The display device of claim 1 , wherein:
the edge extends in a horizontal direction; and
the sub-pixel renderer is configured to render pixel data about a sub-pixel of a pixel in an (n+2k) th pixel column (where n is a natural number, and k is an integer that is greater than or equal to 0) and an m th pixel row (where m is a natural number) located at the edge to pixel data about a sub-pixel of a pixel in the (n+2k) th pixel column and an (m−1) th pixel row located at the edge.

8. The display device of claim 1 , wherein:
the edge extends in a diagonal direction passing through a second quadrant and a fourth quadrant; and
the sub-pixel renderer is configured to render pixel data about a sub-pixel of a pixel in an (n+2k) th pixel column (where n is a natural number, and k is an integer that is greater than or equal to 0) and an (m+2k) th pixel row (where m is a natural number) located at the edge to pixel data about a sub-pixel of a pixel in the (n+2k) th pixel column and an (m+2k−1) th pixel row located at the edge.

9. The display device of claim 1 , wherein:
the edge extends in a diagonal direction passing through a first quadrant and a third quadrant; and
the sub-pixel renderer is configured to render pixel data about a sub-pixel of a pixel in an (n+2k) th pixel column (where n is a natural number, and k is an integer that is greater than or equal to 0) and an (m−2k) th pixel row (where m is a natural number) located at the edge to pixel data about a sub-pixel of a pixel in the (n+2k) th pixel column and an (m−2k−1) th pixel row located at the edge.

10. A method of driving a display device in which an arrangement of sub-pixels of a pixel in an odd-numbered pixel column is different from an arrangement of sub-pixels of a pixel in an even-numbered pixel column, the method comprising:
determining a line roughness based on a pixel pitch in a vertical direction and a distance between a sub-pixel of a pixel in the odd-numbered pixel column and a sub-pixel of a pixel in the even-numbered pixel column that are configured to display the same color in one pixel row, in the vertical direction,
determining an edge from image data; and
performing sub-pixel rendering on pixel data about sub-pixels configured to display a same color in adjacent pixels in the odd-numbered pixel column or the even-numbered pixel column located at the edge.

11. The method of claim 10 , wherein, in response to a half of the pixel pitch being greater than or equal to the distance, performance of the sub-pixel rendering is omitted.

12. The method of claim 10 , wherein the arrangement of the sub-pixels of the pixel in the odd-numbered pixel column and the arrangement of the sub-pixels of the pixel in the even-numbered pixel column are axisymmetric with respect to a horizontal direction.

13. The method of claim 10 , wherein a pixel in the even-numbered pixel column and one pixel row of the display device is parallel to a pixel in the odd-numbered pixel column and the pixel row in a vertical direction.

14. The method of claim 10 , wherein a pixel in the even-numbered pixel column and one pixel row of the display device is shifted from a pixel in the odd-numbered pixel column and the pixel row in a vertical direction.

15. The method of claim 10 , wherein, in response to the edge extending in a horizontal direction, performance of the sub-pixel rendering comprises rendering pixel data about a sub-pixel of a pixel in an (n+2k) th pixel column (where n is a natural number, and k is an integer that is greater than or equal to 0) and an m th pixel row (where m is a natural number) located at the edge to pixel data about a sub-pixel of a pixel in the (n+2k) th pixel column and an (m−1) th pixel row located at the edge.

16. The method of claim 10 , wherein, in response to the edge extending in a diagonal direction passing through a second quadrant and a fourth quadrant, performance of the sub-pixel rendering comprises rendering pixel data about a sub-pixel of a pixel in an (n+2k) th pixel column (where n is a natural number, and k is an integer that is greater than or equal to 0) and an (m+2k) th pixel row (where m is a natural number) located at the edge to pixel data about a sub-pixel of a pixel in the (n+2k) th pixel column and an (m+2k−1) th pixel row located at the edge.

17. The method of claim 10 , wherein, in response to the edge extending in a diagonal direction passing through a first quadrant and a third quadrant, performance of the sub-pixel rendering comprises rendering pixel data about a sub-pixel of a pixel in an (n+2k) th pixel column (where n is a natural number, and k is an integer that is greater than or equal to 0) and an (m−2k) th pixel row (where m is a natural number) located at the edge to pixel data about a sub-pixel of a pixel in the (n+2k) th pixel column and an (m−2k−1) th pixel row located at the edge.

Assignees

• Samsung Display Co Ltd

Inventors

• Cheon Woo-Young
• Kwon Soyoung
• LEE Jaeun

Classifications

• G09G3/007 Primary

  Use of pixel shift techniques, e.g. by mechanical shift of the physical pixels or by optical shift of the perceived pixels · CPC title

• G09G2340/0457

  Improvement of perceived resolution by subpixel rendering · CPC title

• G09G2320/0257

  Reduction of after-image effects · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G3/20 Primary

  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 title