Rohm has developed colour sensors for display-equipped devices such as smartphones and tablets capable of detecting the colour temperature, brightness, and RGB components of ambient light.
The sensor, BH1745NUC, leverages original infrared removal technology and computing methods to achieve high infrared cutoff characteristics, reducing the effects of infrared rays by over 10x.
This enables compatibility with dark (low permeability) optical windows – unlike conventional color sensors that cannot provide accurate detection due to the effects of infrared interference when dark windows are used.
In recent years a greater number of smartphones, tablets, and other display-equipped devices have begun to integrate color sensors in order to analyse the RGB components of ambient light for display image adjustment or perform backlight dimming based on the surrounding brightness levels.
Conventional colour sensors require a transparent optical window in order to accurately detect visible (i.e. RGB) light. However, the design trend in many smartphones and portable devices is to adopt dark optical windows, which although are more stylish make it difficult to precisely detect colours, since less visible light gets through and the light that does permeate gets mixed in with IR rays.
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