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Bright light

An efficient approach to driving white leds in lcd backlight applications. By Gareth Henson.

Virtually every piece of portable and handheld equipment incorporates a liquid crystal display. The growth in demand for pdas, laptops, Wap and video enabled ’phones has been accompanied by a similar growth in demand for more displays – particularly ‘brighter’ lcds which can be more easily read in daylight.
The simplest way to produce a brighter lcd is to backlight it with white leds. Efficiency of the backlight circuit is crucial in the conservation of battery power and while specially designed circuits are available for this purpose, a more cost effective solution could be at hand. The XC9105 from Torex Semiconductor is a dc/dc converter that gives designers a highly efficient solution to driving the white leds used to backlight colour lcds.

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Vanessa Knivett

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