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ROHM unveils colour sensor for smartphones, tablets

Posted: 09 Feb 2015     Print Version  Bookmark and Share

Keywords:Sensor  display  smartphones  BH1745NUC 

ROHM Semiconductor announces the development of its new colour sensor for display-equipped devices such as smartphones and tablets capable of detecting the colour temperature, brightness, and RGB components of ambient light.

The BH1745NUC leverages infrared removal technology and computing methods to achieve high infrared cut-off characteristics, reducing the effects of infrared rays by over 10x compared with competing products. This enables compatibility with dark (low permeability) optical windows—unlike conventional colour 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 colour 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.

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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.

In response, ROHM takes advantage of optical sensor expertise cultivated over many years, including original infrared removal technology and proprietary computing methods, to develop a colour sensor that provides unmatched performance—even with dark optical windows.

Compatibility with dark optical windows provides greater design flexibility Industry-leading infrared cut-off characteristics reduce the effects of IR rays by more than 10x compared with conventional products. This provides greater design freedom by enabling support for even dark optical windows. ROHM's new colour sensor is capable of filtering only the spectrum of visible light in order to perform more accurate brightness and colour temperature calculations based on ambient conditions.

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