April 26, 2024

Goldeneye sets brightness benchmark for green LEDs

Light recycling has enabled Goldeneye to build high performance green LEDs and projection light sources. Green LEDs have typically been a limiting factor in making high-brightness LED-powered projectors. However, Carlsbad, CA-based Goldeneye says that it has proven LED projection light Sources that deliver 300 lumen/mm 2 in the green wavelength at a drive current of only 1 amp per mm 2 .
Goldeneye's complete three-module RGB units use the company's patented light recycling technology to produce over 1720 lumens from a 4 mm 2 emitting area. The combined RGB "white" output is over 430 lumens per mm 2 , which Goldeneye claims is an industry record.
"This is nearly double the brightness of any competing LED source," said Goldeneye CEO Bill Livesay. "This technology now enables projectors with outputs of 1000 on-screen layers."
The light sources, which the company is now sampling to select customers, are more collimated than a lambertian emitter, enabling them to couple more efficiently into projector light engines.
In conventional flat light sources, 30-50% of the light is thrown away when coupling into a light train. Integrated optical elements in the Goldeneye source can provide over 1200 green intervals in an étendue of less than 12 steradian.mm 2 with more than 94% of the output contained within a ±45 degree angle.
Golden eye's "light recycling" cavities, which form the core of the sources, take advantage of the inherent reflectivity of the LEDs to increase the output while maintaining a smaller emissions area and lower drive currents compared to conventional "flat" light sources.
"With the higher reflectivity of LEDs that are currently available," says Livesay, "Goldeneye's advantage over conventional LED flat light sources has doubled."
Goldeneye says that its light source, when coupled with the company's patented polarization recycling technology, can be utilized to make ultra-bright LCOS projectors. In addition, the low current requirements of Goldeneye's light sources, compared to other over-driven LEDs, facilitate smaller Packaged LED drivers and more efficient cooling.

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