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Optoelectronics/Displays??

LED backlighting system measures 82 inches, consumes 1,000W

Posted: 13 Jun 2005 ?? ?Print Version ?Bookmark and Share

Keywords:backlighting system? golden dragon led? osram opto semiconductors? led? lcd display?

A prototype of a backlighting system with Golden Dragon LEDs from Osram Opto Semiconductors measures 82 inches. This model is the size of a door and is one of the largest LED backlighting system ever completed for an LCD display. The backlighting system has a depth of 40mm, produces 10,000cd/m? and has a life span of 50,000 hours. Its power consumption is 1,000W.

To make the best possible use of the available space behind the display and achieve uniform illumination with optimum color mixing, 1,120 LEDs are used in clusters of four. Each of these clusters include two green, one blue and one red chip, all fabricated in thin-film technology. This technology produces much more effective chips than conventional methods as these "top-lookers" emit almost all their light upwards, said Osram Opto. This means that the light can be better injected into external optics.

The wavelengths have been slightly changed (green 527nm, blue 458nm and red 625nm), which increases the color gamut by more than 50 percent compared with conventional cold cathode fluorescence lamps or existing LED solutions.

Displays backlit with LEDs do not require fans, do not contain any lead or mercury and therefore comply with the RoHS directive. They are vibration- and shockproof, and have short switching times of less than 100ns. The pulse mode of the LEDs improves the presentation of moving images and allows for infinite dimming, added the company.




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