System and method for external pixel compensation
AssigneeApple Inc.
InventorsJesse Aaron Richmond, Mohammad B. Vahid Far, Yafei Bi, Kingsuk Brahma
Life of this patent
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Abstract
An electronic device includes a display panel. The display panel includes a plurality of pixels, each of which includes a driving thin-film-transistor (TFT) configured to receive driving data related to the operation of a respective pixel and a light-emitting diode configured to emit light based on the driving data provided to the TFT. The display panel also includes compensation circuitry configured to generate offset data from compressed offset data and apply the offset data to the pixel data to generate the driving data.
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 driving data related to an operation of a respective pixel;
- and
- a light-emitting diode configured to emit light based on the driving data provided to the TFT;
- and
- compensation circuitry configured to generate offset data from compressed offset data and apply the offset data to pixel data to generate the driving data at least in part by transmitting the offset data for a period of time before transmitting the pixel data, wherein the compensation circuitry comprises:
- a gamma digital-to-analog converter (DAC);
- and
- an offset DAC, wherein the compensation circuitry is configured to provide compensated pixel data as the driving data by adding an output of the gamma DAC and the output of the offset DAC.
A method, comprising:
- receiving grey level pixel data;
- converting the grey level pixel data via a gamma digital to analog converter (DAC) into converted pixel data;
- converting offset data related non-uniformity between a plurality of pixels into converted offset data via an offset DAC;
- applying the converted offset data to the converted pixel data in a summing circuit comprising a switched-capacitor circuit that receives the converted offset data to generate compensated driving data at least in part by closing a first switch of the switched-capacitor circuit to couple a capacitor of the switched-capacitor circuit to the offset DAC for a first time period;
- and
- controlling emission of light from a light-emitting diode of a pixel of the plurality of pixels based on the compensated driving data.
An electronic display, comprising:
- compensation circuitry comprising:
- a first input configured to receive pixel data related to generating an image on a display comprising a plurality of pixels;
- a second input configured to receive, separate from receiving the pixel data, compressed offset data related to non-uniformity between the plurality of pixels;
- a decoder configured to decompress the compressed offset data to generate offset data;
- an offset digital-to-analog converter (DAC) coupled to the decoder and configured to convert the offset data into converted offset data;
- a gamma DAC configured to convert the pixel data into converted pixel data;
- and
- a summing circuit coupled to the offset DAC and the gamma DAC and configured to:
- close a switch coupled between an input to the summing circuit and an output of the summing circuit;
- and
- add, in response to the closing of the switch, the converted offset data to the converted pixel data to generate driving data to compensate for the non-uniformity between the plurality of pixels.
Dependencies are inferred from the claim text.