Integrated color sensor drives smartphone intelligent display management
The TMD3782 optical module is ideally suited for smartphones and tablets. The sensor integrated in the TMD3782 provides ambient light intensity (lux) and color measurement enabling mobile devices to automatically adjust their display’s color and brightness for the best viewing experience and power savings.
High-resolution displays are now standard features in mobile devices, making it critical they provide accurate colors and brightness while operating in a wide range of light sources, including fluorescent, incandescent and sunlight. The TMD3782 on-chip filters minimize the effects of ultra-violet and IR light and enable its photopic response thus improving the overall accuracy of light and color sensing.
Enhancing the user’s viewing experience across a wide range of lighting conditions offers mobile device manufacturers new means to draw consumers to their brand. The TMD3782 is able to sense light in a similar manner to the human eye, enabling more sophisticated control of the display brightness and color. The combination of ambient light and color sensing enables mobile devices to deliver more brilliant display colors and a superior viewing experience in all lighting environments.
The TMD3782 packs the ambient light, color and proximity sensor, IR LED and optical lenses in a 3.9 x 2.4 x 1.4 mm module suitable for mounting in the densely populated and low-profile board assemblies commonly found in mobile devices. The sensor’s integrated proximity sensor can be used to simplify a product’s user interface, for instance, supporting intelligent on/off control of smartphone touchscreens. The device’s integrated proximity sensor also allows tablets to eliminate false ambient light sensing measurements by detecting when the user’s hand or finger is blocking light from reaching the sensor. The proximity detection is factory-calibrated to a distance of 100mm, eliminating the need for OEMs to perform production-line calibration, and simplifying end-product manufacturing.
The TMD3782 sensor’s photodiodes have a radial structure to create a uniform and optimized angular response when mounted under the 360° module lens. The sensor also provides a 45 degree field of view for a broader and more accurate measurement of the lighting environment. An interrupt capability enables the sensor to alert the applications processor when pre-set light and color measurement thresholds are crossed, eliminating the need for continuous polling and reducing overall system power requirements and hence extending battery life.
Availability and Pricing
The TMD3782 optical sensor module is in volume production and is priced at $1.45 for 1,000 pieces.
An evaluation kit for the TMD3782 is available online from ams.
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