Systems and methods of reduced memory bandwidth compensation

• US 9,947,293 B2
• Filed: 05/26/2016
• Issued: 04/17/2018
• Est. Priority Date: 05/27/2015
• Status: Active Grant

• Current Assignee: IGNIS Innovation Incorporated
• Original Assignee: IGNIS Innovation Incorporated
• Inventors: Chaji, Gholamreza
• Primary Examiner(s): Gray, Ryan M
• Application Number:
  US15/165,435
• Publication Number:
  US 20160351094A1
• Time in Patent Office: 691 Days
• Field of Search: None
• CPC Class Codes: G09G 2320/0223 Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/029 by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 2340/04 Changes in size, position or resolution of an image
• CPC Class Codes: G09G 2350/00 Solving problems of bandwidth in display systems
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: G09G 5/026 Control of mixing and/or overlay of colours in general G09G5/022 and G09G5/024 take precedence

Abstract

What is disclosed are systems and methods of compensation of images produced by active matrix light emitting diode device (AMOLED) and other emissive displays. Sub-sampling of pixel measurement data utilized in compensation of the display is utilized to reduce the data bandwidth between memory and a compensation module where the data is locally interpolated.

Claims

1. A method for compensating an image produced by an emissive display system having pixels, each pixel having a light-emitting device, the method comprising:

measuring characteristics of a plurality of pixels generating measurement data for use in compensation of the display;

storing the measurement data in a memory;

retrieving partial resolution measurement data from the measurement data stored in the memory, the partial resolution measurement data comprises measurement data only for a selected subset of pixels of the display;

interpolating the measurement data generating full resolution interpolated measurement data;

wherein for each pixel of the display other than pixels of said selected subset of pixels of the display;

predicting a corresponding interpolated pixel data portion of said full resolution interpolated measurement data;

comparing said corresponding interpolated pixel data portion with a corresponding pixel data portion of said full resolution measurement data generating a predicted pixel interpolation error, and

for pixels where said predicted pixel interpolation error exceeds a threshold, storing interpolation correction data for said pixels in an error table, and performing said generation of said full resolution interpolated measurement data comprises determining absolute measurement data for said pixels with use of said interpolation correction data; and

compensating the display with use of the full resolution interpolated measurement data.

2. The method of claim 1 wherein measuring characteristics of a plurality of pixels comprises measuring with sub-sampling characteristics only of a selected subset of the pixels of the display system generating measurement data which is said partial resolution measurement data.

3. The method of claim 1 wherein measuring characteristics of a plurality of pixels comprises measuring characteristics of all of the pixels of the display system generating measurement data which comprises full resolution measurement data, and wherein retrieving partial resolution measurement data comprises retrieving with sub-sampling measurement data of only a selected subset of pixels of the display from the full resolution measurement data stored in the memory.

4. The method of claim 3 further comprising:

determining the selected pixels of the display so as to reduce an error between the full resolution interpolated measurement data and the full resolution measurement data.

5. The method of claim 1 wherein a sub-sampling frequency utilized to generate partial resolution measurement data is settable by at least one of a user and the display system.

6. A method for compensating an image produced by an emissive display system having pixels, each pixel having a light-emitting device, the method comprising:

measuring characteristics of a plurality of pixels generating measurement data for use in compensation of the display;

storing the measurement data in a memory;

retrieving partial resolution measurement data from the measurement data stored in the memory;

interpolating the measurement data generating full resolution interpolated measurement data; and

compensating the display with use of the full resolution interpolated measurement data,

wherein measuring characteristics of a plurality of pixels generating measurement data comprises generating low spatial frequency measurement data and high spatial frequency measurement data,

wherein storing the measurement data in the memory comprises storing the low spatial frequency measurement data and high spatial frequency measurement data in the memory,

wherein retrieving partial resolution measurement data from the measurement data stored in the memory comprises retrieving low spatial frequency partial resolution measurement data from the low spatial frequency measurement data stored in the memory and retrieving high spatial frequency partial resolution measurement data from the high spatial frequency measurement data stored in the memory, and

wherein interpolating the measurement data generating full resolution interpolated measurement data comprises interpolating the low spatial frequency measurement data and interpolating the high spatial frequency measurement data and combining the interpolated low spatial frequency measurement data and the interpolated high spatial frequency measurement data together generating full resolution interpolated measurement data.

7. The method of claim 6, wherein the partial resolution measurement data comprises measurement data only for a selected subset of pixels of the display.

8. The method of claim 7, further comprising for each pixel of the display other than pixels of said selected subset of pixels of the display:

predicting a corresponding interpolated pixel data portion of said full resolution interpolated measurement data;

comparing said corresponding interpolated pixel data portion with a corresponding pixel data portion of said full resolution measurement data generating a predicted pixel interpolation error; and

for pixels where said predicted pixel interpolation error exceeds a threshold, storing interpolation correction data for said pixel in an error table and performing said generation of said full resolution interpolated measurement data comprises determining absolute measurement data for said pixel with use of said interpolation correction data.

9. The method of claim 8 wherein determining absolute measurement data for said pixel comprises replacing corresponding interpolated pixel data portion of said full resolution interpolated measurement data with said interpolation correction data.

10. The method of claim 8 wherein determining absolute measurement data for said pixel comprises replacing corresponding interpolated pixel data portion of said full resolution interpolated measurement data with absolute measurement data generated with use of said interpolation correction data and said corresponding interpolated pixel data portion.

11. A system for compensating an image produced by an emissive display system having pixels, each pixel having a light-emitting device, the system comprising:

a display comprising said pixels;

a monitoring system coupled to said pixels of said display and for measuring characteristics of a plurality of said pixels generating measurement data for use in compensation of the display;

a memory for storing the measurement data;

an interpolation module for retrieving partial resolution measurement data from the measurement data stored in the memory and interpolating the measurement data generating full resolution interpolated measurement data, wherein the partial resolution measurement data comprises measurement data only for a selected subset of pixels of the display; and

a compensation module for compensating the display with use of the full resolution interpolated measurement data;

wherein the interpolation module is further for,

for each pixel of the display other than pixels of said selected subset of pixels of the display;

predicting a corresponding interpolated pixel data portion of said full resolution interpolated measurement data;

comparing said corresponding interpolated pixel data portion with a corresponding pixel data portion of said full resolution measurement data generating a predicted pixel interpolation error; and

for pixels where said predicted pixel interpolation error exceeds a threshold, for storing interpolation correction data for said pixel in an error table and performing said generation of said full resolution interpolated measurement data comprises determining absolute measurement data for said pixel with use of said interpolation correction data.

12. The system of claim 11 wherein the monitoring system is for measuring characteristics of a plurality of pixels which comprises measuring with sub-sampling characteristics only of a selected subset of the pixels of the display system generating measurement data which is said partial resolution measurement data.

13. The system of claim 11 wherein the monitoring system is further for measuring characteristics of all of the pixels of the display system generating measurement data which comprises full resolution measurement data, and wherein the interpolation module is further for retrieving with sub-sampling measurement data of only a selected subset of pixels of the display from the full resolution measurement data stored in the memory.

14. The system of claim 13 further comprising:

a sub-sampling module for determining the selected pixels of the display so as to reduce an error between the full interpolated resolution measurement data and the full resolution measurement data.

15. The system of claim 11 wherein a sub-sampling frequency utilized to generate partial resolution measurement data is settable by at least one of a user and the display system.

16. A system for compensating an image produced by an emissive display system having pixels, each pixel having a light-emitting device, the system comprising:

a display comprising said pixels;

a monitoring system coupled to said pixels of said display and for measuring characteristics of a plurality of said pixels generating measurement data for use in compensation of the display;

a memory for storing the measurement data;

an interpolation module for retrieving partial resolution measurement data from the measurement data stored in the memory and interpolating the measurement data generating full resolution interpolated measurement data; and

a compensation module for compensating the display with use of the full resolution interpolated measurement data;

wherein measuring characteristics of a plurality of pixels generating measurement data comprises generating low spatial frequency measurement data and high spatial frequency measurement data,

wherein storing the measurement data in the memory comprises storing the low spatial frequency measurement data and high spatial frequency measurement data in the memory,

wherein retrieving partial resolution measurement data from the measurement data stored in the memory comprises retrieving low spatial frequency partial resolution measurement data from the low spatial frequency measurement data stored in the memory and retrieving high spatial frequency partial resolution measurement data from the high spatial frequency measurement data stored in the memory, and

wherein interpolating the measurement data generating full resolution interpolated measurement data comprises interpolating the low spatial frequency measurement data and interpolating the high spatial frequency measurement data and combining the interpolated low spatial frequency measurement data and the interpolated high spatial frequency measurement data together generating full resolution interpolated measurement data.

17. The system of claim 16 wherein the partial resolution measurement data comprises measurement data only for a selected subset of pixels of the display.

18. The system of claim 17 wherein the interpolation module is further for,

for each pixel of the display other than pixels of said selected subset of pixels of the display:

predicting a corresponding interpolated pixel data portion of said full resolution interpolated measurement data;

comparing said corresponding interpolated pixel data portion with a corresponding pixel data portion of said full resolution measurement data generating a predicted pixel interpolation error; and

for pixels where said predicted pixel interpolation error exceeds a threshold, for storing interpolation correction data for said pixel in an error table and performing said generation of said full resolution interpolated measurement data comprises determining absolute measurement data for said pixel with use of said interpolation correction data.

19. The system of claim 18 wherein determining absolute measurement data for said pixel comprises replacing corresponding interpolated pixel data portion of said full resolution interpolated measurement data with said interpolation correction data.

20. The system of claim 18 wherein determining absolute measurement data for said pixel comprises replacing corresponding interpolated pixel data portion of said full resolution interpolated measurement data with absolute measurement data generated with use of said interpolation correction data and said corresponding interpolated pixel data portion.