Development of Ambient Light Sensor ICs for efficient control of LED backlight display
Ambient light sensors are the light sensitive component that are used to adjust the brightness of an LCD display’s backlight so that the display would remain comfortably readable over a range of ambient conditions. Featuring Rohm’s proprietary trimming process and the use of multiple photodiodes with different junction depth, Rohm Semiconductor has developed a both analog and digital ambient light sensor (ALS) ICs for the efficient control of LED backlight in LCD equipped devices. According to Rohm the newly developed ALS provide an accurate output with little variation on various light sources and accurate light measurement which is the result of a spectral response of ALS which has been tailored to closely match that of the human eye. Due to these features the new ALS provide a uniform visibility for LCD displays over a wide range of ambient light sources from incandescent or florescent light to sunlight. The BH16xx (analog) series provide a linear current output proportional to luminous intensity ranging from 0 to 100,000 lx where as the BH17xx (digital) series has integrated a 16-bit ADC that produces 1 lx resolution over a range of 0 to 65,000 lx. Company announced both product samples immediate availability. The analog and digital ALS ICs are available in either the ultra-small WSOF5 surface-mount package (1.6 x 1.6 x 0.55mm) or slightly larger WSOF6 surface-mount package (3 x 1.6 x 0.7mm).
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[...] new functionality on these devices, ROHM made an announcement on development of industry’s first digital ambient light sensor IC compatible with I2C bus Hs (High-speed) mode. The newly developed BH1780GLI is capable of [...]