Method of using a pixel to display an image

• US 9,035,980 B2
• Filed: 05/31/2012
• Issued: 05/19/2015
• Est. Priority Date: 09/21/2011
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Yang, Hsueh-Yen, Lee, Yun-Hsiang, Tsai, Tze-Chien
• Primary Examiner(s): Danielsen, Nathan
• Application Number:
  US13/485,842
• Publication Number:
  US 20130070006A1
• Time in Patent Office: 1,083 Days
• Field of Search: 345690-697, 345/82, 345/83
• 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, 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; 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, further comprising:

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, 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.

4. The method of claim 3, wherein the first brightness ratio is:

5. The method of claim 1, further comprising:

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, 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.

6. The method of claim 5, wherein the second brightness ratio is:

7. The method of claim 1, further comprising:

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, 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.

8. The method of claim 7, wherein the first brightness ratio is:

9. 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.

10. 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, 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; 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.

11. The method of claim 10, 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.

12. The method of claim 10, further comprising:

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, 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.

13. The method of claim 12, wherein the first brightness ratio is:

14. The method of claim 10, further comprising:

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, 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.

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

16. The method of claim 10, further comprising:

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, 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.

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

18. The method of claim 10, 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.