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EE Times-India > Optoelectronics/Displays

White LED flash drivers brighten DSCs

Posted: 16 Sep 2008     Print Version  Bookmark and Share

Keywords:white LED flash driver  digital still cameras  illuminance 

In the cellular handset market, the inclusion of high-pixel-count imagers integrated into the handset has almost become standard. As the resolution of these imagers increases, the need for brighter flash sources also increases. The use of Xenon flash bulbs has long been the main illumination choice in digital cameras. The mobile handset board area for non-telephone related functions is sparse and the Xenon approach is often impractical due to solution size.

Luckily for handset manufacturers, the recent advancements in high power white LEDs have been dramatic. Manufacturers of white LED flash diodes now have products that can deliver light outputs greater than 70 lumens, and can handle pulsed currents greater than or equal to 1A. Along with these advancements come new questions the handset designer must answer. How much PCB area can be used? What added flash related features are needed? How much power can the flash driver be allowed to use? How much illuminance is needed to take a decent picture? Answering these questions can greatly aid the designer in the selection of a flash LED driver.

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