发明名称 |
CALIBRATED IMAGE-SENSOR-BASED AMBIENT LIGHT SENSOR |
摘要 |
An electronic device may be provided with an image sensor for capturing digital images. The image sensor may be used as part of image-sensor-based ambient light sensing circuitry for producing ambient light sensor readings. The image-sensor-based ambient light sensing circuitry may include a reference array. The reference array may be formed from an array of light sensor elements that are matched to elements in the image sensor but that are covered with a light blocking material. Control circuitry can measure current flow into the reference array and the image sensor array and can use current measurements from these arrays in producing a calibrated ambient light sensor reading. The control circuitry may make current measurements by measuring a decay time associated with the voltage of a discharging capacitor. A comparator, pulse generator, and switch may be used in periodically recharging the capacitor. The capacitor may be adjusted to ensure accurate readings.
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申请公布号 |
US2013278576(A1) |
申请公布日期 |
2013.10.24 |
申请号 |
US201213449842 |
申请日期 |
2012.04.18 |
申请人 |
LEE CHIAJEN;SHARMA ANUP;FAN XIAOFENG;APPLE INC. |
发明人 |
LEE CHIAJEN;SHARMA ANUP;FAN XIAOFENG |
分类号 |
G09G5/10;H01L27/146 |
主分类号 |
G09G5/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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