US 11,810,494 B2
Dither enhancement of display gamma DAC systems and methods
Jie Won Ryu, Santa Clara, CA (US); ByoungSuk Kim, Palo Alto, CA (US); David S Zalatimo, San Jose, CA (US); Graeme M Williams, San Diego, CA (US); Hyunsoo Kim, San Diego, CA (US); Hyunwoo Nho, Palo Alto, CA (US); Jesse R Manders, San Francisco, CA (US); Kingsuk Brahma, Mountain View, CA (US); Li-Xuan Chuo, San Jose, CA (US); Sachiko Oda, Santa Clara, CA (US); Shatam Agarwal, San Jose, CA (US); and Yao Shi, Sunnyvale, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Aug. 16, 2022, as Appl. No. 17/820,190.
Claims priority of provisional application 63/247,165, filed on Sep. 22, 2021.
Prior Publication US 2023/0087480 A1, Mar. 23, 2023
Int. Cl. G09G 3/20 (2006.01); H03M 1/10 (2006.01)
CPC G09G 3/2044 (2013.01) [H03M 1/1019 (2013.01); G09G 2310/027 (2013.01); G09G 2320/0276 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electronic device comprising:
an electronic display comprising a plurality of display pixels configured to display an image based at least in part on a plurality of analog voltage signals;
optical calibration circuitry configured to generate digital-to-analog converter (DAC) data based at least in part on image data associated with the image;
dither circuitry configured to reduce a bit-depth of the DAC data, generating dithered DAC data; and
a gamma generator comprising one or more DACs configured to generate the analog voltage signals based at least in part on the dithered DAC data, wherein the dithered DAC data is configured to instruct the gamma generator to generate the plurality of analog voltage signals indicative of the image data, wherein the gamma generator is physically separated from the dither circuitry by a data bus, and wherein the data bus is configured to transmit the dithered DAC data to the gamma generator at the reduced bit-depth.