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US 10,096,284 B2Granted
System and method for external pixel compensation
AssigneeApple Inc.
InventorsMohammad B. Vahid Far, Jesse A. Richmond, Yafei Bi
Life of this patent
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Abstract
An electronic device includes a display panel. The display panel includes a number of pixels, each of which includes a driving thin-film-transistor (TFT) and a light-emitting diode. Compensation circuitry external to the display panel applies offset data to pixel data for each pixel of the plurality of pixels before the pixel data is provided to the plurality of pixels.
Claims17
An electronic device, comprising:
- a display panel, comprising:
- a plurality of pixels, each pixel of the plurality of pixels comprising:
- a driving thin-film-transistor (TFT) configured to receive pixel data of a respective pixel;
- and
- a light-emitting diode configured to emit light based on the pixel data provided to the respective pixel;
- and
- a processing unit, comprising:
- a gamma digital-to-analog converter (DAC) configured to receive pixel data;
- an offset DAC configured to receive offset data;
- a feedback path comprising a programmable resistor, wherein the feedback path comprises an output from the offset DAC;
- and
- a driver integrated circuit (IC) configured to provide compensated pixel data by adding an output of the gamma DAC and an output of the feedback path, wherein the driver IC is configured to apply the compensated pixel data to each pixel of the plurality of pixels, wherein the light-emitting diode is configured to emit light based upon the compensated pixel data.
9 more elements
A method of operating an electronic device with a display panel, comprising:
- applying offset data to pixel data for each pixel of a plurality of pixels of the display panel of the electronic device, prior to provision of the pixel data to the plurality of pixels, resulting in compensated pixel data by:
- providing the pixel data to a gamma digital-to-analog converter (DAC) of a source driver;
- and
- providing the offset data to an offset DAC of the source driver, wherein an output of the gamma DAC is configured to interest a feedback path comprising a programmable resistor to create a current, wherein the source driver is configured to provide the compensated pixel data by adding the current to an output of the offset DAC;
- applying, at a driving thin-film-transistor (TFT) of each of the plurality of pixels, compensated voltage data that is based upon the compensated pixel data, resulting in a compensated current;
- and
- applying the compensated current to a corresponding diode of each of the plurality of pixels.
4 more elements
An electronic display circuitry, comprising:
- a display panel having a processing unit, the processing unit comprising:
- a gamma digital-to-analog converter (DAC) configured to receive pixel data;
- an offset DAC configured to receive offset data;
- a first driver integrated circuit (IC) configured to receive a halved output from the gamma DAC;
- and
- a feedback path comprising a first programmable resistor, wherein the feedback path is configured to receive, through an electrical coupling to a second programmable resistor, a doubled voltage output from the offset DAC;
- and
- wherein the processing unit is configured to apply offset data from the first driver IC to pixel data for each pixel of a plurality of pixels of the display panel, prior to provision of the pixel data to the plurality of pixels, such that a compensated voltage is applied to a driving thin-film-transistor (TFT) of each pixel, resulting in a compensated current that is applied to a light-emitting diode of each pixel.
5 more elements
Dependencies are inferred from the claim text.