Osram is also touting the new 2×2 version’s flexibility. With just one set of Red, Converted Green and Blue LEDs, it is now possible to achieve a luminous flux of 400 lm from the projector, according to the company. The new version has been designed specifically for imager diagonals between 0.4 inches and 0.55 inches. If multiple sets of these LEDs are combined for larger imager diagonals, the high brightness levels needed for office projector applications can be achieved.
The Ostar Compact 2×2 LED also promises a favorable ratio of light to size. With dimensions of 5.8 x 4.6 mm and an output of 85 lm per mm² of footprint, it is the brightest LED in this package class on the projection market (measured in pulse mode for green at an operating current of 6 A). It contains two 2 mm2 chips and produces twice the output of the standard Compact LED with one chip.
The package is available in Red, Converted Green and Blue. In Converted Green, for example, the LED has a typical luminous flux of 2400 lm in pulse mode at an operating current of 6 A. This increase in output is based on the two integrated blue chips using new ThinGaN technology and the green phosphor converter. Since a greater proportion of green than red or blue is needed to produce white light, the increase in brightness has a significant effect on the overall system brightness of the projector.
“Each chip in the new Ostar Compact 2×2 can be individually controlled, which offers higher flexibility for the design engineer in the choice of LED drivers,” said Wolfgang Schnabel, product manager for the Ostar Compact series. “The two chips can be connected in parallel or in series, with the latter providing higher efficiency and more readily available standard drivers.”
For more information, please visit www.osram-os.com.