Compensation systems and methods for OLED display degradation
What is disclosed are systems and methods for compensating for display OLED degradation. Correction factors k for OLED degradation of each sub-pixel is modelled and tracked based on grey level, temperature, and time, and used to correct image data provided to an OLED display.
1. A method of compensating for degradation in a plurality of pixels of a display panel module mounted in a host device, the host device also including an image data block configured to generate or receive image data, including grey level data, for displaying images on the display panel module, each pixel including a light-emitting device, the method comprising:
during operation of the display panel module, receiving the image data at the host device via the image data block; sampling grey level data of the image data intended for the plurality of pixels prior to being provided to the emissive display panel, and sampling temperature data corresponding to the plurality of pixels;
determining an updated correction factor for the plurality of pixels as a function of the grey level data and the temperature data for the plurality of pixels; and
applying the updated correction factor for the plurality of pixels to the image data for the plurality of pixels, generating corrected image data for display by the display panel module.
2. The method according to claim 1 , wherein each updated correction factor is further determined as a function of a sampling time period.
3. The method according to claim 2 , wherein each updated correction factor is determined as a sum of a product of a first function of the grey level data, a second function of the sampling time period, and a third function of the temperature data of each of the plurality of pixels.
4. The method according to claim 1 , further comprising storing, for each of the plurality of the pixels, an initial correction factor representing a degradation of each of the plurality of pixels in non-volatile memory.
5. The method according to claim 1 , further comprising storing each updated correction factor in a non-volatile memory included in the display panel module.
6. The method according to claim 5 , wherein each updated correction factor is stored in the non-volatile memory each time each updated correction factor is determined.
7. The method according to claim 5 , wherein each updated correction factor is stored in the non-volatile memory while the host device is powered down.
8. The method according to claim 5 , further comprising storing each updated correction factor in a look-up table in volatile memory in the display module.
9. The method according to claim 5 , further comprising storing each updated correction factor in a look-up table in volatile memory in the host device.
10. The method according to claim 1 , further comprising storing each updated correction factor in a non-volatile memory included in the host device.
11. The method according to claim 10 , wherein the host device includes a processing unit configured to determine each updated correction factor.
12. A device comprising:
a display panel module comprising:
a display panel including a plurality of pixels, each pixel including a light-emitting device;
a display processing unit;
display non-volatile memory; and
display volatile memory;
an image data block for providing image data to the display panel;
a host processing unit including:
host non-volatile memory; and
host volatile memory;
the host processing unit configured for:
storing, for each of the plurality of pixels, a correction factor representing a degradation of the pixel in the host non-volatile memory;
during operation of the display panel, sampling grey level data of the image data received from the image block intended for each of the plurality of pixels prior to being provided to the emissive display panel, and temperature data corresponding to each of the plurality of pixels received from the display panel; and
determining an updated correction factor for each of the plurality of pixels as a function of the sampled grey level data and temperature data for each of the plurality of pixels; and
a compensation block for applying the updated correction factor for each of the plurality of pixels to the image data for each of the plurality of pixels received from the image data block, and generating corrected image data for display by the display panel.
13. The device according to claim 12 , wherein the host processing unit is further configured to determine each updated correction factor as a function of a sampling time period.
14. The device according to claim 13 , wherein the host processing unit is configured to determine each updated correction factor as a sum of a product of a first function of the grey level data, a second function of the sampling time period, and a third function of the temperature data for each of the plurality of pixels.
15. The device according to claim 13 , wherein the host processing unit is configured to store each updated correction factor in the host non-volatile memory.
16. The device according to claim 13 , wherein the compensation block is provided in the display processing unit.
17. The device according to claim 16 , wherein the host processing unit is configured to store each updated correction factor in the display non-volatile memory.
18. The device according to claim 17 , wherein the host processing unit is configured to store each updated correction factor in the display non-volatile memory each time each updated correction factor is determined.
19. The device according to claim 17 , wherein the host processing unit is configured to store each updated correction factor in the display non-volatile memory while the display panel module is powered down.
20. The device according to claim 17 , wherein the host processing unit is configured to store each updated correction factor in a look-up table in the display volatile memory.