AMBIENT LIGHT SENSOR AND ELECTRONIC SYSTEM HAVING THE SAME

An ambient light sensor includes a photoelectric conversion part, a current control part, a signal conversion part and a comparator. The photoelectric conversion part generates a photo current having intensity corresponding to the luminance of an incident light and then provides the photo current fo...

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Bibliographic Details
Main Authors LEE, KWANG HYUN, KIM, MOO YOUNG, KIM, YUN HONG, KIM, TAE CHAN, HONG, SEOK YONG
Format Patent
LanguageEnglish
Korean
Published 13.03.2015
Subjects
COLORIMETRY
MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT
MEASURING
PHYSICS
RADIATION PYROMETRY
TESTING
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Summary:An ambient light sensor includes a photoelectric conversion part, a current control part, a signal conversion part and a comparator. The photoelectric conversion part generates a photo current having intensity corresponding to the luminance of an incident light and then provides the photo current for a first node. The current control part generates a control current exponentially proportional to the elapse time on the basis of a clock signal and then provides the control current for the first node, and outputs a digital code corresponding to the elapse time in response to a reset signal. The signal conversion part generates a comparison voltage logarithmically proportional to the intensity of the sum of the photo current and the control current. The comparator generates a reset signal by comparing the amplitude of the comparison voltage with the amplitude of a reference voltage. The ambient light sensor can generate a digital code logarithmically proportional to the luminance of the incident light.
Bibliography:Application Number: KR20130106849