System and method for correcting defective pixels of a display device

• US 20060061604A1
• Filed: 09/23/2004
• Published: 03/23/2006
• Est. Priority Date: 09/23/2004
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Tretter, Daniel R., Damera-Venkata, Niranjan, Ulichney, Robert A.
• Granted Patent: US 7,453,449 B2
• Time in Patent Office: Days
• US Class Current: 345/694
• CPC Class Codes: G09G 2330/10 Dealing with defective pixels
• CPC Class Codes: G09G 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 3/007 Use of pixel shift techniques, e.g. by mechanical shift of the physical pixels or by optical shift of the perceived pixels
• 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 3/2011 by amplitude modulation
• CPC Class Codes: H04N 9/646 for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters

Abstract

A method of displaying an image with a display device having a plurality of defective pixels is provided. The method comprises selecting an offset between a first sub-frame and a second sub-frame using information associated with the plurality of defective pixels, generating the first sub-frame and the second sub-frame using image data for the image, adjusting a first sub-frame pixel value in the first sub-frame associated with one of the plurality of defective pixels, and alternating between displaying the first sub-frane in a first position and displaying the second sub-frame in a second position, the second position displaced from the first position by an amount defined by the offset.

Claims

1. A method of displaying an image with a display device having a plurality of defective pixels, the method comprising:

selecting an offset between a first sub-frame and a second sub-frame using information associated with the plurality of defective pixels;

generating the first sub-frame and the second sub-frame using image data for the image;

adjusting a first sub-frame pixel value in the first sub-frame associated with one of the plurality of defective pixels; and

alternating between displaying the first sub-frame in a first position and displaying the second sub-frame in a second position, the second position displaced from the first position by an amount defined by the offset.

2. The method of claim 1 further comprising:

selecting the offset such that the offset is associated with a lowest number of stuck-on-stuck pixels.

3. The method of claim 1 further comprising:

selecting the offset such that the offset is associated with a lowest number of edge pixels.

4. The method of claim 1 further comprising:

adjusting the first sub-frame pixel value in the first sub-frame by increasing the first sub-frame pixel value in response to the one of the plurality of defective pixels comprising a stuck-off pixel.

5. The method of claim 1 further comprising:

adjusting the first sub-frame pixel value in the first sub-frame by decreasing the first sub-frame pixel value in response to the one of the plurality of defective pixels comprising a stuck-on pixel.

6. The method of claim 1 further comprising:

adjusting a second sub-frame pixel value in the second sub-frame associated with the one of the plurality of defective pixels.

7. The method of claim 6 further comprising:

adjusting the second sub-frame pixel value in the second sub-frame by increasing the second sub-frame pixel value in response to the one of the plurality of defective pixels comprising a stuck-off pixel.

8. The method of claim 6 further comprising:

adjusting the second sub-frame pixel value in the second sub-frame by decreasing the second sub-frame pixel value in response to the one of the plurality of defective pixels comprising a stuck-on pixel.

9. The method of claim 1 further comprising:

adjusting a second sub-frame pixel value in the first sub-frame associated with an edge pixel.

10. The method of claim 9 further comprising:

adjusting the second sub-frame pixel value in the first sub-frame by increasing the second sub-frame pixel value.

11. The method of claim 1 wherein the offset comprises a horizontal offset and a vertical offset.

12. The method of claim 11 wherein the horizontal offset is equal to n pixels where n is an integer, and wherein the vertical offset is equal to m pixels where m is an integer.

13. A system for displaying an image, the system comprising:

an image processing unit; and

a display device having a plurality of defective pixels;

wherein the image processing unit is configured to determine an offset associated with the plurality of defective pixels, wherein the image processing unit is configured to generate a first sub-frame and a second sub-frame using image data for the image, information associated with the plurality of defective pixels, and the offset, wherein the display device is configured to alternately display the first sub-frame in a first position and display the second sub-frame in a second position, and wherein the second position is displaced from the first position according to the offset.

14. The system of claim 13 wherein the image processing unit is configured to generate a third sub-frame and a fourth sub-frame using the image data, information associated with the plurality of defective pixels, and the offset, wherein the display device is configured to alternately display the third sub-frame in a third position and display the fourth sub-frame in a fourth position, and wherein the third position and the fourth position are displaced from the first position according to the offset.

15. The system of claim 13 wherein the image processing unit is configured to select the offset by determining a number of stuck-on-stuck pixels for each of a plurality of possible offsets, and wherein the offset is associated with a lowest number of stuck-on-stuck pixels.

16. The system of claim 15 wherein the offset is associated with a lowest number of edge pixels in response to at least two of the possible offsets being associated with a lowest number of stuck-on-stuck pixels.

17. The system of claim 13 wherein the image processing unit is configured to adjust a first sub-frame pixel value in the first sub-frame by increasing the first sub-frame pixel value in response to one of the plurality of defective pixels associated with the first sub-frame pixel value comprising a stuck-off pixel.

18. The system of claim 17 wherein the image processing unit is configured to adjust a second sub-frame pixel value in the second sub-frame by increasing the second sub-frame pixel value in response to one of the plurality of defective pixels associated with the second sub-frame pixel value comprising a stuck-off pixel.

19. The system of claim 13 wherein the image processing unit is configured to adjust a first sub-frame pixel value in the first sub-frame by decreasing the first sub-frame pixel value in response to one of the plurality of defective pixels associated with the first sub-frame pixel value comprising a stuck-on pixel.

20. The system of claim 19 wherein the image processing unit is configured to adjust a second sub-frame pixel value in the second sub-frame by decreasing the second sub-frame pixel value in response to one of the plurality of defective pixels associated with the second sub-frame pixel value comprising a stuck-on pixel.

21. The system of claim 13 wherein the image processing unit is configured to adjust a first sub-frame pixel value in the second sub-frame in response to the first sub-frame pixel value being associated with an edge pixel.

22. The system of claim 21 wherein the image processing unit is configured to adjust the first sub-frame pixel value in the second sub-frame by increasing the first sub-frame pixel value in response to the first sub-frame pixel value being associated with the edge pixel.

23. The system of claim 13 wherein the offset comprises a horizontal offset and a vertical offset, wherein the horizontal offset is equal to n pixels where n is an integer, and wherein the vertical offset is equal to m pixels where m is an integer.

24. A system for displaying an image using a display device having a plurality of detective pixels, the system comprising:

means for selecting an offset between a first sub-frame and a second sub-frame using information associated with the plurality of detective pixels;

means for generating the first sub-frame and the second sub-frame using image data for the image, the information associated with the plurality of detective pixels, and the offset; and

means for sequentially displaying the first sub-frame in a first position and displaying the second sub-frame in a second position which is displaced from the first position according to the offset.

25. The system of claim 24 wherein the offset comprises a horizontal offset and a vertical offset, wherein the horizontal offset is equal to n pixels where n is an integer, and wherein the vertical offset is equal to m pixels where m is an integer.

26. A computer-readable medium having computer-executable instructions for performing a method of generating a first sub-frame and a second sub-frame for display at spatially offset positions defined by an offset by a display device having a plurality of defective pixels to generate the appearance of an image, comprising:

determining the offset using information associated with the plurality of defective pixels;

generating the first sub-frame including adjusting a first plurality sub-frame pixel values of the first sub-frame associated with the plurality of defective pixels; and

generating the second sub-frame including adjusting a second plurality sub-frame pixel values of the second sub-frame associated with the plurality of defective pixels.

27. The computer-readable medium of claim 26 having computer-executable instructions for performing the method further comprising:

identifying the first plurality sub-frame pixel values using the information associated with the plurality of defective pixels and the offset; and

identifying the second plurality sub-frame pixel values using the information associated with the plurality of defective pixels and the offset.

28. The computer-readable medium of claim 26 having computer-executable instructions for performing the method further comprising:

determining a number of stuck-on-stuck pixels for each of a plurality of possible offsets and determining the offset that is associated with a lowest number of stuck-on-stuck pixels.

29. The computer-readable medium of claim 28 having computer-executable instructions for performing the method further comprising:

determining the offset that is associated with a lowest number of edge pixels in response to at least two of the possible offsets being associated with a lowest number of stuck-on-stuck pixels.

30. The computer-readable medium of claim 26 wherein the offset comprises a horizontal offset and a vertical offset, wherein the horizontal offset is equal to n pixels where n is an integer, and wherein the vertical offset is equal to m pixels where m is an integer.