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Optoelectronics/Displays??

LEDs deliver improved backlight in large-screen LCDs

Posted: 22 Oct 2008 ?? ?Print Version ?Bookmark and Share

Keywords:LCD backlight? LED? backlit display?

Osram Opto Semiconductors has released the new Advanced Power TOPLED Plus, claimed to deliver the brightest color LED, providing 15 percent more light for direct display backlighting than standard Advanced Power TOPLEDs.

Depending on the display, the LEDs in the usual combination of red (623nm), green (527nm) and blue (457nm) cover more than 125 percent of the NTSC color gamut and are suitable for all directly backlit displays, particularly for large LCDs in sizes of 24 inches diagonal and up. This new generation of Advanced Power TOPLED Plus offers an optimized display brightness-to-thickness ratio so that the minimum number of LEDs is required.

The improved brightness of the new Advanced Power TOPLED Plus is made possible by a new lens specially designed for backlighting. At an operating current of 100mA, the LEDs achieve 14lm (red), 24lm (green) and 28mW/sr (blue). The wider viewing angle of the new lens ensures absolutely uniform backlighting. The chips used are 500m in size and are fabricated with the latest ThinGaN or Thinfilm technology for the highest efficiency: 65lm/W (red), 59lm/W (green) and 27 percent overall efficiency (blue). With a lifetime of more than 50,000 hours, the Advanced Power TOPLED Plus provides suitable compatibility with typical LCD lifespans. The LEDs' low profile of only 2.25mm high enables the design and production of very thin backlights.

Osram's Advanced Power TOPLED Plus is suitable for all display sizes. By enabling an optimized brightness-to-thickness display ratio, only 1,200 LEDs are needed to backlight a 24-inch diagonal LCD compared to previous designs that required up to 1,800 LEDs to produce the same brightness. Projects are already under way with key customers for use in 46-inch monitors.

"Close relations with our customers and extensive application support enable us to ensure that the special requirements of each and every display are fully achieved," said Winfried Schwedler, marketing manager for LED backlighting at Osram. "This includes not only the selection of suitable LEDs but also the logistical support for module manufacture based on the latest simulation methods. The result is extremely homogenous display backlighting."

- Video/Imaging DesignLine





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