SYSTEM AND METHOD FOR COMPENSATION OF NON-UNIFORMITIES IN LIGHT EMITTING DEVICE DISPLAYS
First Claim
12. A method of operating a display having a plurality of pixels to compensate for a degradation of a pixel in the display, the pixel having a driving circuit for driving a current through a light emitting device based on an input, the input being supplied to the driving circuit by a display driver, the method comprising:
- receiving luminosity data;
scaling the luminosity data by a compression factor to create compressed data;
compensating for a degradation of a pixel in the display by adjusting the compressed data based on the degradation to create compensated data; and
sending the compensated data to the display driver.
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Abstract
A system and method for operating a display at a constant luminance even as some of the pixels in the display are degraded over time. Each pixel in the display is configured to emit light when a voltage is supplied to the pixel'"'"'s driving circuit, which causes a current to flow through a light emitting element. Degraded pixels are compensated by supplying their respective driving circuits with greater voltages. The display data is scaled by a compression factor less than one to reserve some voltage levels for compensating degraded pixels. As pixels become more degraded, and require additional compensation, the compression factor is decreased to reserve additional voltage levels for use in compensation.
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Citations
55 Claims
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12. A method of operating a display having a plurality of pixels to compensate for a degradation of a pixel in the display, the pixel having a driving circuit for driving a current through a light emitting device based on an input, the input being supplied to the driving circuit by a display driver, the method comprising:
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receiving luminosity data; scaling the luminosity data by a compression factor to create compressed data; compensating for a degradation of a pixel in the display by adjusting the compressed data based on the degradation to create compensated data; and sending the compensated data to the display driver. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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14-1. The method of claim 13, wherein the adjusting is carried out by computing the ratio of the ascertained maximum compensation to a maximum assignable value of the inputs and updating the compression factor to be one minus the computed ratio.
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24. A method of operating a display having a plurality of pixels to compensate for degradation of the plurality of pixels, wherein the plurality of pixels have driving circuits for driving currents through light emitting devices based on inputs, the method comprising:
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operating the display according to a first compression factor by; receiving a first set of luminosity data for the plurality of pixels; scaling the first set of luminosity data by the first compression factor to create a first set of compressed data; compensating for a first degradation of the plurality of pixels by adjusting the first set of compressed data based on a first set of offset increments to create a first set of compensated data; and supplying the driving circuits based on the first set of compensated data; determining a second compression factor based on a second degradation of the plurality of pixels; and operating the display according to the second compression factor by; receiving a second set of luminosity data for the plurality of pixels; scaling the second set of luminosity data by the second compression factor to create a second set of compressed data; compensating for the second degradation of the plurality of pixels by adjusting the second set of compressed data based on a second set of offset increments to create a second set of compensated data; and supplying the driving circuits based on the second set of compensated data. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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33. A display degradation compensation system for compensating for a degradation of a plurality of pixels in a display, wherein the plurality of pixels have driving circuits for driving currents through light emitting devices, the display degradation compensation system comprising:
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a digital data processor module for receiving a luminosity data, compressing the luminosity data according to a compression factor, and compensating for the degradation of the plurality of pixels by adjusting the compressed data to create compensated data; and a display driver for receiving the compensated data and supplying the inputs to the driving circuits, the driving circuits being configured to deliver the driving currents to the light emitting devices based on the received compensated data. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A method of operating a display having a plurality of pixels to compensate for a degradation of the plurality of pixels, wherein the plurality of pixels have driving circuits for driving currents through light emitting devices based on inputs, the method comprising:
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receiving a video signal having a set of grayscale values for the plurality of pixels; compressing the grayscale values to a range less than an available range and reserving a remaining amount of grayscale values for adjustments; and outputting the compressed grayscale values to a display driver for programming the driving circuits of the plurality of pixels. - View Dependent Claims (44, 45, 46, 47, 48)
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49. A system for compensating for non-uniformities in a display having a plurality of pixels, at least one of the plurality of pixels including a pixel circuit having a light emitting device, the pixel circuit configured to drive the pixel based on luminance data;
- the system comprising;
a module for modifying the pixel data applied to one or more than one pixel, the module including; an estimating module for estimating a degradation of a first pixel circuit based on measurement data read from the first pixel circuit; a grayscale compression module for compressing the luminance data according to a grayscale compression algorithm to reserve grayscale values; and a compensating module for correcting the compressed luminance data applied to the first or a second pixel circuit based on the estimation of the degradation of the first pixel circuit; and a display driver for receiving the corrected luminance data and supplying the pixel circuit with an analog voltage or current based on the corrected luminance data. - View Dependent Claims (50, 51, 52, 53, 54, 55)
- the system comprising;
Specification