Article Abstracts | April 2008
The complete article appears in the April 2008 issue of Photonics Spectra. If you do not have a copy of this issue,
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LED Backlighting in Large-Screen Displays
When building large LED backlight systems, it is important to control the current, minimize power dissipation, reduce electromagnetic interference and achieve local dimming.
by Markus Luidolt, austriamicrosystems AG
LEDs have been the standard backlighting source in mobile devices for several years. Now televisions, monitors and notebooks all are starting to move toward LED backlighting.
Although LEDs cost more, they have several benefits over cold-cathode fluorescents as backlights. Their size permits the design of very thin devices, with thicknesses less than 1 inch. In RGB backlighting, a much wider color gamut can be reached. Contrast ratios also can be increased with local LED backlighting. They are robust and offer a better lifetime than other lighting sources and, last but not least, LEDs are environmentally friendly, especially compared with cold-cathode fluorescents...
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