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48.1: A New Monolithic Polysilicon Ambient Light Sensor System with Wide Dynamic Range for Active‐Matrix Displays by Employing an Adaptive Sensitivity Control Method
Author(s) -
Park HyunSang,
Ha TaeJun,
Han MinKoo,
Woo DooHyung,
Shin KwangSub,
Kim ChiWoo
Publication year - 2008
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3069767
Subject(s) - sensitivity (control systems) , dynamic range , materials science , wide dynamic range , substrate (aquarium) , electronic engineering , process (computing) , polycrystalline silicon , optoelectronics , active matrix , computer science , engineering , nanotechnology , thin film transistor , oceanography , layer (electronics) , geology , operating system
Abstract We design and fabricate a new digital ambient light sensor system on a glass substrate using a conventional low‐temperature polycrystalline silicon (LTPS) technology. The adaptive sensitivity control scheme considerably increases the input dynamic range from 30 dB to 60 dB. In the proposed system, analog‐to‐digital conversion (ADC) process is performed in the time domain instead of the voltage domain and is combined with light detection process. Because the complex analog circuitry is eliminated from the system, the proposed system can be readily integrated on the display panel.