Ambient-light sensor system with wide dynamic range enhanced by adaptive sensitivity control

— A new digital ambient‐light sensor system is presented which employs two linear light sensors with different sensitivities and automatically adjusts the sensitivity based on the illumination condition. The adaptation mechanism allows a very wide range of light intensity to be detected, and the inp...

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Bibliographic Details
Published in:Journal of the Society for Information Display 2009-08, Vol.17 (8), p.681-686
Main Authors: Park, Hyun-Sang, Ji, Seon-Beom, Han, Min-Koo, Lee, Jae-Sic, Kim, Chi-Woo, Choi, Kwang-Soo
Format: Article
Language:English
Subjects:
analog-to-digital conversion
dynamic range
LTPS
photodiode
Sensor
TFT
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Summary:— A new digital ambient‐light sensor system is presented which employs two linear light sensors with different sensitivities and automatically adjusts the sensitivity based on the illumination condition. The adaptation mechanism allows a very wide range of light intensity to be detected, and the input dynamic range of the system is substantially improved from 22.5 to 45.1 dB. The proposed method does not require any additional precision bits for output data. Due to the small number of the output bits and the simple conversion process, the system can be easily integrated on the display panel.
ISSN:1071-0922
1938-3657
DOI:10.1889/JSID17.8.681