2009
DOI: 10.1889/jsid17.8.681
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Ambient‐light sensor system with wide dynamic range enhanced by adaptive sensitivity control

Abstract: Abstract— 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 a… Show more

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Cited by 7 publications
(5 citation statements)
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“…Ambient-light sensors are promising applications of the visible-light sensors. [18][19][20][21][22][23][24] They are used to control the display brightness and balance the display visibility and power saving when they are quipped in FPDs.…”
Section: Ambient-light Sensormentioning
confidence: 99%
“…Ambient-light sensors are promising applications of the visible-light sensors. [18][19][20][21][22][23][24] They are used to control the display brightness and balance the display visibility and power saving when they are quipped in FPDs.…”
Section: Ambient-light Sensormentioning
confidence: 99%
“…The sensor was realized using a 0.5 µm standard CMOS process. The literature [ 9 ] also proposed a novel, digital ambient light sensor system that automatically adjusts the sensitivity according to the lighting conditions. The literature [ 10 ] proposed a CMOS monolithic digital light sensor with a calibration technique suitable for ambient light sensors.…”
Section: Introductionmentioning
confidence: 99%
“…Additionally, the literature [ 11 ] proposed a low-power ambient light sensor with digital output, using a correlated photocurrent reflector to improve its power consumption and a pulse-width comparison algorithm to achieve an adjustable dynamic range. However, none of the works in the literature [ 8 , 9 , 10 , 11 ] have considered the effect due to a dark current. The literature [ 12 ] proposed an ultra-low-power ambient light sensor for portable devices fabricated using 0.5 µm standard CMOS technology.…”
Section: Introductionmentioning
confidence: 99%
“…Similarly, conventional imaging applications demand photodetectors that work only in visible region of the spectrum [4]. On the other hand, certain applications like optical meters, spectrophotometers, ambient light sensors demand photodetectors that show response towards broader spectrum [5,6]. Thus, there is a constant need for research innovation to develop suitable photodetectors that are specific to a particular application.…”
Section: Introductionmentioning
confidence: 99%