Patent · US Active

Electronic device display with charge accumulation tracker

US9922608B2 · kind B2 · utility

3Cited by

4References

16Claims

0Family size

Assignee

Apple Inc. · US

Inventors

Chaohao Wang · Sunnyvale, US
Brijesh Tripathi · Los Altos, US
Christopher P. Tann · San Jose, US
David S. Zalatimo · Menlo Park, US
Guy Cote · San Jose, US
Hao Nan · San Mateo, US
Marc Albrecht · Hamburg, DE
Paolo Sacchetto · Cupertino, US
Sandro H. Pintz · Menlo Park, US

Key dates

Filing date	May 27, 2015
Grant date	Mar 20, 2018
Priority date	—
Expiry date	Dec 9, 2035

Classification

Technology area (CPC G)Physics
CPC primaryG09G2360/16
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

An electronic device may generate content that is to be displayed on a display. The display may have an array of liquid crystal display pixels for displaying image frames of the content. The image frames may be displayed with positive and negative polarities to help reduce charge accumulation effects. A charge accumulation tracker may analyze the image frames to determine when there is a risk of excess charge accumulation. The charge accumulation tracker may analyze information on gray levels, frame duration, and frame polarity. The charge accumulation tracker may compute a charge accumulation metric for entire image frames or may process subregions of each frame separately. When subregions are processed separately, each subregion may be individually monitored for a risk of excess charge accumulation.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.