ams fits optical sensor at the back of OLED screens

January 08, 2019 //By Julien Happich
ams fits optical sensor at the back of OLED screens
ams' TCS3701 enables front-facing ambient light and proximity sensing measurements in smartphones from under a OLED display.

The RGB light and IR proximity sensor IC can accurately measure the intensity of ambient light from behind an OLED screen to supports today's industrial design trend to maximize smartphone display area by eliminating front-facing bezels, where an ambient light/proximity sensor is typically located.

Despite the constraint of operating behind an emissive OLED display screen, the TCS3701 senses the addition of the ambient light passing through the display to light emitted by the display's pixels located just above the sensor. ams has developed unique algorithms which enable accurate detection of ambient light levels without knowledge of the display pixel brightness above the sensor.
Light transmission through an OLED screen is limited by its opacity, but the TCS3701's ultra-high sensitivity to light means that it can still produce accurate light measurements in all lighting conditions. The chip comes in a 2.0x2.5x0.5mm OQFN package small enough to be placed behind a smartphone's OLED screen. It gives a smartphone designer the flexibility to mount an IR emitter to support the proximity sensing function in the best front-facing location. Cross-talk compensation algorithms provide for reliable proximity sensing performance.

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