Light offers uniformity

Associate Editor Deana Colucci picks noteworthy display products

By Deana Colucci -- Design News, September 7, 1998

Teledyne's new ALPHALIGHT(TM) bright 6500K white LED backlight offers "shadow-free" uniformity for non-emissive displays such as active matrix liquid crystal. The light produces a uniformity of 1.3:1 over the exit aperture, while the light produced exhibits an optical gain of up to 100% through beam collimation. This new light uses only white LEDs and is not derived from mixing red, green, and blue LEDs as are some other white lights. ALPHALIGHT uses low-voltage (3.6 to 15V) dc power, operates with constant current or a pulse-width-modulated drive, has 20 ns rise times, and is infinitely adjustable with respect to dimming. Dr. David Pelka, director of product development at Teledyne, says the light can operate instantly without ac noise, and requires no warm-up or over-voltage start-up when addressed. Teledyne Lighting and Display Products. Product Code 4409

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