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Optoelectronics/Displays??

Green chip lights up to 180 lumens

Posted: 02 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:ThinGaN technology? green chips? LCD backlighting applications?

The new green chip in ThinGaN technology from Osram Opto Semiconductors has achieved a brightness in the laboratory above 180 lumens. The 1mm? chips will be used in Dragon and Ostar LEDs. Specially designed for low current, these high-power LEDs are efficient light sources for display backlighting.

The high-intensity green chips are designed for LCD backlighting applications. The devices achieve maximum efficiency over the current range of 100-350mA. A smaller number of LEDs is thus needed to provide a specified brightness level over large display diagonals. Thanks to their small power consumption of slightly over 1W, LEDs with the new chips place very modest demands on display cooling, explain Osram.

In the laboratory, the green chip with a wavelength of 527nm has achieved more than 180 lumens from an operating current of 1A. From 350mA it produces 100 lumens and consumes 1.4W (72 llumens/W). By contrast, the conventional generation of chips in the current green Platinum Dragon LED would need an operating current of 1A to produce 100 lumens.

This increase in output is based on a new epitaxial process and improved chip design, said Osram.

Osram expects the first LEDs based on the chips will go into series production by mid-2008.




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