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Color controller integrates RGB photosensor for LCD backlighting

San Jose, Calif. — Avago Technologies claims it has developed the industry's first color controller with an integrated color photosensor for backlighting liquid crystal displays (LCDs) used in portable display devices. The ADJD-J823, packaged in a small 5 x 5 x 0.75-mm footprint, targets digital cameras, cell phones, PDAs, portable DVD players and display screens measuring 7-inches diagonal or smaller.

The integrated color management (ICM) device is an off-the-shelf solution that combines RGB sensors, color controllers and high-brightness LEDs. A typical system consists of an array of red, green and blue (RGB) LEDs, LED drivers and the ADJD-J823, which is a CMOS mixed-signal IC with integrated RGB photosensors that is designed to be the closed loop optical feedback device of an RGB LED-based backlighting system.


The ADJD-J823 operates at voltages as low as 2.5 volts. It also touts a wide gain control and uses an algorithm to automatically select the optimum gain. How it works: The device samples the light output from the RGB LED array; processes the color information and adjusts the light output from the RGB LEDs until the target color is achieved. This is achieved through the integration of an RGB photosensor array, an analog-to-digital converter front-end, a color data processing logic core and a high-resolution 12-bit pulse-width modulation (PWM) output generator.

The light output produced by the LED array is said to maintain its color over time and temperature. Click the link for additional information about the ADJD-J823.

Avago's ADJD-J823 color controller with integrated color sensor is priced at less than $10 in low volumes.

Avago Technologies , 1-800-235-0312, www.avagotech.com/led

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