OSRAM LEDs Homing in on Office Projectors
Dec 22, 2010 The prototype of a green LED based on the OSTAR platform from OSRAM Opto Semiconductors is twice as bright as its predecessors and has a luminous surface that is perfectly uniform. This single-chip LED benefits from the latest chip technology and a green phosphor converter. Initial samples are already available, and the process of finding partners to develop appropriate LED office projectors is already under way. The semiconductor specialist expects the LED to be launched on the market in the summer of 2011.
The prototype with a single chip achieves 410 lm and emits at a wavelength of 553 nm. Since a greater proportion of green than red or blue is needed in a projector to produce white light, the increase in the brightness of the green LED has a significant effect on the overall system brightness. With these LED prototypes it is possible to produce systems that provide the system brightness of 2000 lm that is needed for office projectors. LED projectors will therefore be powerful enough for large diagonals of more than two meters.
The LEDs enable projectors to be virtually maintenance-free because they have a life of 30,000 hours. Projectors with LEDs also respond more quickly to on/off switching, and they support stepless dimming. They can therefore adapt very easily to ambient light conditions and reduce energy consumption.
Author: BIO T&T
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