Methods to compensate manufacturing variations and design imperfections in a display device
A display device includes (a) a non-volatile memory containing corrective data for compensating input image data received; (b) display hardware receiving control and data signals for displaying an image; and (c) an image processing circuit that retrieves the corrective data from the non-volatile memory to generate the data signals for the display hardware, after applying the corrective data to each color component of each pixel in the input image data.
1. A method for generating corrective data for correcting manufacturing variations of a target display device, wherein the target display device comprises a plurality of pixels and a thermometer that measures an operating temperature at the pixels of the target display device, the method comprising:
displaying an image comprising standardized color patterns on the target display device under controlled operating conditions;
detecting intensities of each color component in the plurality of pixels corresponding to the image displayed on the target display device;
determining differences between the intensities of each color component in the plurality of pixels and corresponding expected values of each color component in the plurality of pixels respectively; and
generating the corrective data for the target display device based on the differences between the intensities of each color component in the plurality of pixels and the corresponding expected values of each color component in the plurality of pixels respectively for the target display device, wherein the corrective data are used for compensating pixel-to-pixel manufacturing variations by applying the corrective data to an image data to be displayed on the target display device at a subsequent time based on measured operating temperature at the pixels of the target display device.
2. The method of claim 1 , wherein the corrective data are stored in a non-volatile memory in the target display device to enable compensation to the input image data over a range of intensities for each color component of each pixel.
3. The method of claim 2 , wherein the corrective data are stored in the non-volatile memory in a table format.
4. The method of claim 1 , wherein said detecting the intensities of each color component, said determining the differences between the intensities of each color component and said generating the corrective data based on the differences for the target display device are performed for an operating temperature of the target display device.
5. The method of claim 1 , wherein the corrective data correspond to compensation values to be applied to corresponding values in input image data.
6. The method of claim 1 , wherein the corrective data correspond to corrective values for predetermined values in input image data, and wherein the corrective values for the input image data are interpolated or extrapolated from the corrective values for the predetermined values.
7. The method of claim 1 , wherein the corrective data correct one or more predetermined values in input image data.
8. The method of claim 1 , wherein the corrective data correspond to values of parameters of a model from which corrective values are generated based on input image data.
9. The method of claim 8 , wherein the model comprises a linear function or polynomial function.
10. The method of claim 1 , wherein the corrective data comprise corrective values applicable to neighboring pixels.
11. The method of claim 1 , wherein the corrective data are applied to the target display device in a digital domain.
12. The method of claim 1 , wherein the corrective data are applied to the target display device in an analog domain.
13. A method for generating corrective data for correcting manufacturing variations of a target display device, wherein the target display device comprises a plurality of pixels, the method comprising:
displaying an image comprising standardized color patterns on the target display device under controlled operating conditions;
detecting intensities of each color component in the plurality of pixels corresponding to the image displayed on the target display device;
determining differences between the intensities of each color component in the plurality of pixels and corresponding expected values of each color component in the plurality of pixels respectively; and
generating the corrective data for the target display device based on the differences between the intensities of each color component in the plurality of pixels and the corresponding expected values of each color component in the plurality of pixels respectively for the target display device, wherein the corrective data are used for compensating pixel-to-pixel manufacturing variations by applying the corrective data to an image data to be displayed on the target display device at a subsequent time.
14. The method of claim 13 , wherein the corrective data stored in a non-volatile memory in the target device to enable compensation to the image data.
15. The method of claim 13 , wherein the display comprises a thermometer for measuring an operating temperature in the target display device, and wherein the corrective data enable compensation of input image data based in part on the measured temperature.
16. The method of claim 13 , wherein the corrective data are stored in a non-volatile memory in a table format.
17. The method of claim 13 , wherein the corrective data correspond to corrective values for predetermined values in input image data, and wherein the corrective values for the input image data are interpolated or extrapolated from the corrective values for the predetermined values.
18. The method of claim 13 , wherein the corrective data correspond to values of parameters of a model from which corrective values are generated based on input image data.
19. The method of claim 18 , wherein the model comprises a linear function or polynomial function.