- 专利标题: Noise reduction in LED sensing circuit for electronic display
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申请号: US15199315申请日: 2016-06-30
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公开(公告)号: US10460642B2公开(公告)日: 2019-10-29
- 发明人: Hung Sheng Lin , Jiayi Jin , Wei H. Yao , Hyunwoo Nho , Guangmao Xing , Weijun Yao , Xiaofeng Wang , Yafei Bi , Haifeng Li
- 申请人: APPLE INC.
- 申请人地址: US CA Cupertino
- 专利权人: Apple Inc.
- 当前专利权人: Apple Inc.
- 当前专利权人地址: US CA Cupertino
- 代理机构: Fletcher Yoder P.C.
- 主分类号: G09G3/20
- IPC分类号: G09G3/20 ; G09G3/3208 ; G09G3/3233
摘要:
Systems, methods, and devices are provided to reduce noise present in sensing circuits used for calibrating light emitting diodes (e.g., organic light emitting diodes) in electronic display devices. Such a system may include a display that renders image data using self-emissive pixels. Values on the pixels may be sensed using a current source that outputs a current and a comparator that receives the current. The comparator changes states when a voltage signal output by the capacitor crosses a first threshold voltage or a second threshold voltage. A controller receives a first time when the comparator component changes states based on the voltage signal, receives a second time when the comparator component changes states based on the voltage signal, determines a current value based on the first time and the second time, and calibrates a pixel based on the current value.