System and method for correcting defective pixels of a display device

• US 20060109286A1
• Filed: 11/23/2004
• Published: 05/25/2006
• Est. Priority Date: 11/23/2004
• 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 8,872,869 B2
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G09G 2310/0224 Details of interlacing
• 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: H04N 5/21 Circuitry for suppressing or minimising disturbance, e.g. moiré or halo

Abstract

A method of displaying an image with a display device having at least one defective display pixel is provided. The method comprises generating first, second, and third sub-frames using image data for the image, information that identifies the at least one defective display pixel, a first pixel offset associated with the second sub-frame, and a sub-pixel offset associated with the third sub-frame, and alternating between displaying the first sub-frame in a first position, displaying the second sub-frame in a second position spatially offset from the first position according to the first pixel offset, and displaying the third sub-frame in a third position spatially offset from the first position and the second position according to the sub-pixel offset.

Claims

1. A method of displaying an image with a display device having at least one defective display pixel, the method comprising:

generating first, second, and third sub-frames using image data for the image, information that identifies the at least one defective display pixel, a first pixel offset associated with the second sub-frame, and a sub-pixel offset associated with the third sub-frame; and

alternating between displaying the first sub-frame in a first position, displaying the second sub-frame in a second position spatially offset from the first position according to the first pixel offset, and displaying the third sub-frame in a third position spatially offset from the first position and the second position according to the sub-pixel offset.

2. The method of claim 1 further comprising:

generating a fourth sub-frame using image data for the image, information that identifies the at least one defective display pixel, the first pixel offset associated with the second sub-frame, the sub-pixel offset associated with the third sub-frame, and a second pixel offset associated with the fourth sub-frame; and

wherein alternating between displaying the first, second, and third sub-frames further includes alternating between displaying the first sub-frame in the first position, displaying the second sub-frame in the second position according to the first pixel offset, displaying the third sub-frame in the third position spatially offset from the first position and the second position according to the sub-pixel offset, and displaying the fourth sub-frame in a fourth position spatially offset from the first position, the second position, and the third position according to the second pixel offset.

3. The method of claim 1 wherein generating the first, the second, and the third sub-frames includes adjusting sub-frame pixel values associated with the at least one defective display pixel.

4. The method of claim 1 wherein generating the first and the second sub-frames includes calculating a correction value for each sub-frame pixel value associated with the at least one defective display pixel.

5. The method of claim 4 wherein generating the third sub-frame includes calculating a plurality of intermediate values for each sub-frame pixel value associated with the at least one defective display pixel.

6. The method of claim 5 wherein the plurality of intermediate values are associated with a stuck-on pixel.

7. The method of claim 5 wherein the plurality of intermediate values are associated with a stuck-off pixel.

8. The method of claim 1 further comprising:

generating the first, the second, and the third sub-frames using an adaptive multi-pass algorithm.

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

a display device having a defective display pixel; and

an image processing unit configured to generate first, second, and third sub-frames using image data for the image, information that identifies the defective display pixel, a first pixel offset associated with the second sub-frame, and a sub-pixel offset associated with the third sub-frame;

wherein the display device is adapted to alternately display the first sub-frame in a first position, display the second sub-frame in a second position spatially offset from the first position using the first pixel offset, and display the third sub-frame in a third position spatially offset from the first position and the second position using the sub-pixel offset.

10. The system of claim 9 wherein the image processing unit is configured to generate a fourth sub-frame using image data for the image, information that identifies the defective display pixel, the first pixel offset associated with the second sub-frame, the sub-pixel offset associated with the third sub-frame, and a second pixel offset associated with the fourth sub-frame, and wherein the display device is adapted to alternately display the first sub-frame in the first position, display the second sub-frame in the second position according to the first pixel offset, display the third sub-frame in the third position spatially offset from the first position and the second position according to the sub-pixel offset, and display the fourth sub-frame in a fourth position spatially offset from the first position, the second position, and the third position according to the second pixel offset.

11. The system of claim 9 wherein the image processing unit is configured to adjust sub-frame pixel values associated with the defective display pixel.

12. The system of claim 9 wherein the image processing unit is configured to calculate a correction value for each sub-frame pixel value associated with the defective display pixel.

13. The system of claim 12 wherein the image processing unit is configured to calculate a plurality of intermediate values for each sub-frame pixel value associated with the defective display pixel.

14. The system of claim 13 wherein the plurality of intermediate values are associated with a stuck-on pixel.

15. The system of claim 13 wherein the plurality of intermediate values are associated with a stuck-off pixel.

16. The system of claim 9 wherein the image processing unit is configured to generate the first, the second, and the third sub-frames using an adaptive multi-pass algorithm.

17. A system for displaying an image using a display device having a detective display pixel, the system comprising:

means for generating first, second, and third sub-frames using image data for the image, information that identifies the defective display pixel, a first pixel offset associated with the second sub-frame, and a sub-pixel offset associated with the third sub-frame; and

means for alternating between displaying the first sub-frame in a first position, displaying the second sub-frame in a second position spatially offset from the first position according to the first pixel offset, and displaying the third sub-frame in a third position spatially offset from the first position and the second position according to the sub-pixel offset.

18. The system of claim 17 further comprising:

means for generating a fourth sub-frame using image data for the image, information that identifies the defective display pixel, the first pixel offset associated with the second sub-frame, the sub-pixel offset associated with the third sub-frame, and a second pixel offset associated with the fourth sub-frame; and

means for alternating between displaying the first sub-frame in the first position, displaying the second sub-frame in the second position according to the first pixel offset, displaying the third sub-frame in the third position spatially offset from the first position and the second position according to the sub-pixel offset, and displaying the fourth sub-frame in a fourth position spatially offset from the first position, the second position, and the third position according to the second pixel offset.

19. The system of claim 17 further comprising:

means for adjusting sub-frame pixel values in the first, the second, and the third sub-frames associated with the defective display pixel.

20. The system of claim 17 further comprising:

means for calculating a correction value for each sub-frame pixel value in the first and the second sub-frames associated with the defective display pixel.

21. The system of claim 20 further comprising:

means for calculating a plurality of intermediate values for each sub-frame pixel value in the third sub-frame associated with the defective display pixel.

22. The system of claim 21 wherein the plurality of intermediate values are associated with a stuck-on pixel.

23. The system of claim 21 wherein the plurality of intermediate values are associated with a stuck-off pixel.

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

calculating a first sub-frame pixel value associated with the defective display pixel for the first sub-frame;

calculating a second sub-frame pixel value associated with the defective display pixel for the second sub-frame; and

calculating at least third and fourth sub-frame pixel values associated with the defective display pixel for the third sub-frame.

25. The computer-readable medium of claim 24 having computer-executable instructions for performing the method further comprising:

calculating the first sub-frame pixel value associated with the defective display pixel for the first sub-frame to be a first correction value; and

calculating the second sub-frame pixel value associated with the defective display pixel for the second sub-frame to be a second correction value.

26. The computer-readable medium of claim 24 having computer-executable instructions for performing the method further comprising:

calculating the at least third and fourth sub-frame pixel values associated with the defective display pixel for the third sub-frame to be first and second intermediate values, respectively.