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OSRAM LED lights 82-inch LCDs

Posted: 26 Dec 2005     Print Version  Bookmark and Share

Keywords:OSRAM Opto Semiconductors  LCD  Golden Dragon ARGUS  light-emitting diode  LED 

Golden Dragon ARGUS LED

OSRAM Opto Semiconductors has entered the large-area, LCD backlighting market with the introduction of its Golden Dragon Argus LED for backlighting 32- to 82-inch LCD panels.

By combining OSRAM's Argus lens and thin-film Golden Dragon LEDs, the company said it was able to produce uniform backlighting for displays and offer high luminous efficacy, paving the company's way into large-area LCD backlighting. The transference of the Argus LED's optical properties to a high-output light source is said to enable bright light to be emitted sideways over the entire surface.

The Golden Dragon Argus assembly comprises of four thin-film, highly luminous LEDs (two green, one blue and one red) in a "marquis jewel" arrangement with a package height of 4mm. Any number of marquis configurations can be combined, either offset in honeycomb patterns or in rows, to form scalable, high-intensity backlighting systems.

This scalable technology allows the highest brightness levels at the lowest operating voltage, and supports all wavelengths, said the company. Each LED can be individually controlled to change the colour hue.

In addition, the LEDs provide a switching time of less than 100ns, which is suitable for sequential colouring, a process in which the three basic colours are pulsed at high frequency and in a particular sequence. The company explained as the speed of liquid crystals increases, sequential colour driver strategies will enable additional enhancements in LCD display performance by reducing the need for colour filters.

Large displays, from 32- to 82-inch prototypes, backlit with LEDs do not need active cooling, even at high outputs. They are vibration and shock-proof and offer a lifetime of more than 50,000 hours. They contain no lead or mercury, and are RoHS compliant.

Golden Dragon Argus will be available in white, red, green and blue in January 2006. Samples are currently available at Rs.825.3 ($18) in quantities of 100 for one set (1 red, 2 green, 1 blue Golden Dragon Argus).

- Gina Roos

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