Accurate, low power RGB digital light sensor peaks mobile and TV displays

January 28, 2014 // By Graham Prophet
The ISL29125 RGB sensor offers on-chip IR filtering technology and broad angular response in a small form factor to assist in maximising display contrast and giving consistent brightness across all light sources.

Intersil’s ISL29125 digital light sensor is a low-power and small Red, Green and Blue (RGB) sensor that communicates directly with a device's core processor to enable the automatic adjustment of display brightness based on changing light conditions, providing consumers with a more crisp and colour consistent image while extending battery life. It is also the smallest 6-lead RGB sensor, which minimises the real estate requirements of the optical sensor aperture, leading to improved industrial device designs.

When moving from one environment to another, lighting conditions invariably change and can affect the clarity and brightness of the device display, sometimes making the display difficult to read and use. With integrated, robust on-chip IR filtering technology and angular response of a minimum of ± 35% field of view at 50% light intensity, the ISL29125 RGB sensor eliminates these display fluctuations, whether one is in an incandescent lit classroom, an LED lit store or outdoors in the sun. The ISL29125 works directly with the device's core processor to continuously adjust the lux range and ensure that the display maintains consistent perceived colour and the ideal brightness level based on the current lighting environment.

The ISL29125 works similarly when integrated into a TV display, effectively adjusting the brightness and colour consistency of the display as the lighting conditions in a room changes. Specifically, in organic light-emitting diode (OLED) display TV applications, the ISL29125 can be used to adjust the blue organic material ageing profile to maintain consistent contrast and brightness throughout the life of the display.

Intersil claims the ISL29125 is the lowest power RGB sensor in the market with a standard I 2C interface and an operating voltage range of 2.25V to 3.63V. The ISL29125 also offers a wide dynamic range of 5.7 millilux to 10 kilolux detection capabilities, which allows the display brightness to adjust in low- to high-lit environments, preventing unnecessary power consumption to prolong battery life. The sensor's lux