ams Integrated Color Sensor Drives New Intelligent Display Management in Smartphones and Tablets

ams AG of Unterpremstaetten, Austria, a provider of high performance analog
ICs and sensors, announced an integrated ambient light, color (RGB) and
proximity sensor that is optimized for operation behind dark glass. The sensor
can reportedly drive intelligent display adoption in mobile devices. The
sensor, which is integrated into the TMD3782 optical module, provides
measurement of color and ambient light intensity (lux). These measurements
allow mobile devices to automatically adjust their display’s color and
intensity for the optimal viewing and power savings.

The high resolution displays that are now standard in mobile devices need to
provide accurate colors and lumen intensity while operating under a wide range
of light sources, incandescent, fluorescent, and sunlight. The TMD3782’s
on-chip filters minimize the effects of ultra-violet and IR light and allow its
photopic response for improved accuracy of light and color sensing. According
to ams, the TMD3782 optical module can sense light in a similar manner to the
human eye. This sensitivity allows sophisticated control of the display color
and brightness.

“The adoption of the TMD3782 by manufacturers validates the industry
trend of increasing intelligence in display management in smartphones and
tablets,” said Darrell Benke, Senior Marketing Manager for opto-sensor
products at ams. “Consumers will choose devices that provide the best
user viewing experience through automatic adjustment of display color as well
as brightness.”

The TMD3782 optical module integrates the color, ambient light, and
proximity sensor along with an IR LED and optical lenses into a 3.9 x 2.4 x
1.4mm module that can be mounted in low-profile board assemblies of mobile
devices. The sensor’s integrated proximity sensor can support intelligent
on-off control of smartphone touchscreens. The device’s integrated
proximity sensor can detect when a hand or finger is blocking light from
reaching the sensor to eliminate false ambient light sensing measurements. The
proximity detection is factory-calibrated to a 100mm distance. This factory
calibration eliminates the need for OEMs to perform the production-line

The TMD3782 sensor’s photodiodes have a radial structure for
optimized, uniform, and angular response when mounted under the 360° module
lens. The sensor has a 45 degree field of view for a broader measurement of the
lighting environment. The opto-sensor features an interrupt capability when
light and color measurements thresholds are crossed that enables the sensor to
alert the applications processor. The interrupt capability eliminates the need
for continuous polling and reduces overall system power requirements.

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