METHOD OF USING A PIXEL TO DISPLAY AN IMAGE

• US 20130070006A1
• Filed: 05/31/2012
• Published: 03/21/2013
• Est. Priority Date: 09/21/2011
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Yang, Hsueh-Yen, Tsai, Tze-Chien, Lee, Yun-Hsiang
• Granted Patent: US 9,035,980 B2
• Time in Patent Office: Days
• US Class Current: 345/694
• 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 3/3225 using an active matrix

Abstract

A first sub-pixel, a second sub-pixel and a third sub-pixel of a pixel are utilized to display a first white image, then a first brightness of the first sub-pixel and a first brightness of the second sub-pixel are measured. The first sub-pixel, the second sub-pixel and a fourth sub-pixel of the pixel are utilized to display a second white image, then a second brightness of the first sub-pixel and a second brightness of the second sub-pixel are measured. How image data should be displayed is determined according to whether the first brightness of the first sub-pixel is greater than the second brightness of the first sub-pixel, whether the first brightness of the second sub-pixel is greater than the second brightness of the second sub-pixel, and whether a chromaticity coordinate of the image data is within a chromaticity range capable of being displayed by the first, second and third sub-pixels.

Claims

1. A method of using a pixel to display an image, the pixel comprising a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel, the third sub-pixel and the fourth sub-pixel being used to display a substantially same color, the method comprising:

providing a first brightness of the first sub-pixel and a first brightness of the second sub-pixel in a first display mode;

providing a second brightness of the first sub-pixel and a second brightness of the second sub-pixel in a second display mode;

inputting an image signal having a chromaticity coordinate;

generating a first comparison relationship according to the first brightness of the first sub-pixel and the second brightness of the first sub-pixel;

generating a second comparison relationship according to the first brightness of the second sub-pixel and the second brightness of the second sub-pixel;

if the chromaticity coordinate of the image signal is within a chromaticity range capable of being displayed by the first sub-pixel, the second sub-pixel and the third sub-pixel, processing the image signal according to the first comparison relationship, the second comparison relationship and the chromaticity coordinate of the image signal; and

displaying the processed image signal in the first display mode, wherein the first display mode is performed by using the first sub-pixel, the second sub-pixel, and the third sub-pixel to display an image, and the second display mode is performed by using the first sub-pixel, the second sub-pixel, and the fourth sub-pixel to display the image.

2. The method of claim 1, wherein:

the step of providing the first brightness of the first sub-pixel and the first brightness of the second sub-pixel in the first display mode comprises;

using the first sub-pixel, the second sub-pixel and the third sub-pixel to display a first white image; and

measuring the first brightness of the first sub-pixel and the first brightness of the second sub-pixel when the first white image is displayed; and

the step of providing the second brightness of the first sub-pixel and the second brightness of the second sub-pixel in the second display mode comprises;

using the first sub-pixel, the second sub-pixel and a fourth sub-pixel to display a second white image; and

measuring the second brightness of the first sub-pixel and the second brightness of the second sub-pixel when the second white image is displayed.

3. The method of claim 1, wherein the step of processing the image signal according to the first comparison relationship, the second comparison relationship and the chromaticity coordinate of the image signal comprises:

if the first brightness of the first sub-pixel is greater than the second brightness of the first sub-pixel and the first brightness of the second sub-pixel is greater than the second brightness of the second sub-pixel, transmitting the image signal.

4. The method of claim 1, wherein the step of processing the image signal according to the first comparison relationship, the second comparison relationship and the chromaticity coordinate of the image signal comprises:

if the first brightness of the first sub-pixel is smaller than the second brightness of the first sub-pixel and the first brightness of the second sub-pixel is greater than the second brightness of the second sub-pixel, transforming the image signal according to a first brightness ratio.

5. The method of claim 4, wherein the first brightness ratio is:

6. The method of claim 1, wherein the step of processing the image signal according to the first comparison relationship, the second comparison relationship and the chromaticity coordinate of the image signal comprises:

if the first brightness of the first sub-pixel is greater than the second brightness of the first sub-pixel and the first brightness of the second sub-pixel is smaller than the second brightness of the second sub-pixel, transforming the image signal according to a second brightness ratio.

7. The method of claim 6, wherein the second brightness ratio is:

8. The method of claim 1, wherein the step of processing the image signal according to the first comparison relationship, the second comparison relationship and the chromaticity coordinate of the image signal comprises:

if the first brightness of the first sub-pixel is smaller than the second brightness of the first sub-pixel and the first brightness of the second sub-pixel is smaller than the second brightness of the second sub-pixel, transforming the image signal according to a first brightness ratio and a second brightness ratio.

9. The method of claim 6, wherein the first brightness ratio is:

10. The method of claim 1, wherein the third sub-pixel has higher luminous efficiency than the fourth sub-pixel, and the fourth sub-pixel has higher color saturation than the third sub-pixel.

11. A method of using a pixel to display an image, the pixel comprising a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel, the third sub-pixel and the fourth sub-pixel being used to display a substantially same color, the method comprising:

providing a first brightness of the first sub-pixel and a first brightness of the second sub-pixel in a first display mode;

providing a second brightness of the first sub-pixel and a second brightness of the second sub-pixel in a second display mode;

inputting an image signal having a chromaticity coordinate;

generating a first comparison relationship according to the first brightness of the first sub-pixel and the second brightness of the first sub-pixel;

generating a second comparison relationship according to the first brightness of the second sub-pixel and the second brightness of the second sub-pixel;

if the chromaticity coordinate of the image signal is outside a chromaticity range capable of being displayed by the first sub-pixel, the second sub-pixel and the third sub-pixel, processing the image signal according to the first comparison relationship, the second comparison relationship and the chromaticity coordinate of the image signal; and

displaying the processed image signal in the second display mode, wherein the second display mode is performed by using the first sub-pixel, the second sub-pixel, and the fourth sub-pixel to display an image, and the first display mode is performed by using the first sub-pixel, the second sub-pixel, and the third sub-pixel to display the image.

12. The method of claim 11, wherein:

the step of providing the first brightness of the first sub-pixel and the first brightness of the second sub-pixel in the first display mode comprises;

using the first sub-pixel, the second sub-pixel and the third sub-pixel to display a first white image; and

measuring the first brightness of the first sub-pixel and the first brightness of the second sub-pixel when the first white image is displayed; and

the step of providing the second brightness of the first sub-pixel and the second brightness of the second sub-pixel in the second display mode comprises;

using the first sub-pixel, the second sub-pixel and a fourth sub-pixel to display a second white image; and

measuring the second brightness of the first sub-pixel and the second brightness of the second sub-pixel when the second white image is displayed.

13. The method of claim 11, wherein the step of processing the image signal according to the first comparison relationship, the second comparison relationship and the chromaticity coordinate of the image signal comprises:

if the first brightness of the first sub-pixel is smaller than the second brightness of the first sub-pixel and the first brightness of the second sub-pixel is smaller than the second brightness of the second sub-pixel, transmitting the image signal.

14. The method of claim 11, wherein the step of processing the image signal according to the first comparison relationship, the second comparison relationship and the chromaticity coordinate of the image signal comprises:

if the first brightness of the first sub-pixel is greater than the second brightness of the first sub-pixel and the first brightness of the second sub-pixel is smaller than the second brightness of the second sub-pixel, transforming the image signal according to a first brightness ratio.

15. The method of claim 14, wherein the first brightness ratio is:

16. The method of claim 11, wherein the step of processing the image signal according to the first comparison relationship, the second comparison relationship and the chromaticity coordinate of the image signal comprises:

if the first brightness of the first sub-pixel is smaller than the second brightness of the first sub-pixel and the first brightness of the second sub-pixel is greater than the second brightness of the second sub-pixel, transforming the image signal according to a second brightness ratio.

17. The method of claim 16, wherein the second brightness ratio is:

18. The method of claim 11, wherein the step of processing the image signal according to the first comparison relationship, the second comparison relationship and the chromaticity coordinate of the image signal comprises:

if the first brightness of the first sub-pixel is greater than the second brightness of the first sub-pixel and the first brightness of the second sub-pixel is greater than the second brightness of the second sub-pixel, transforming the image signal according to a first brightness ratio and a second brightness ratio.

19. The method of claim 18, wherein the first brightness ratio is:

20. The method of claim 11, wherein the third sub-pixel has higher luminous efficiency than the fourth sub-pixel, and the fourth sub-pixel has higher color saturation than the third sub-pixel.