28 September 2011

Osram OSTAR Compact 2x2 LED doubles brightness for projection applications

Osram Opto Semiconductors GmbH of Regensburg, Germany has added another LED to its portfolio for projection applications, adding to the existing versions of the OSTAR Compact series. With twice the brightness in all colors and near-record-breaking green values, the OSTAR Compact 2x2 is claimed to be the brightest LED of its type on the market, making it suitable for high-power projectors for the commercial and domestic sectors.

With the new 2x2 version, the OSTAR Compact series now offers greater flexibility. With just one set of red, converted green and blue LEDs, it is now possible to achieve a luminous flux of 400lm from the projector. The new version has been designed specifically for imager diagonals of 0.4-0.55 inches. If multiple sets of the LEDs are combined for larger imager diagonals, the high brightness levels needed for office projector applications can be achieved.

Osram Opto claims that the OSTAR Compact 2x2 LED offers the best ratio of light to size available. With dimensions of 5.8mm x 4.6mm and an output of 85lm per mm² of footprint, it is claimed to be the brightest LED in this package class on the projection market (measured in pulse mode for green at an operating current of 6A). Containing two 2mm2 chips, it 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 what is claimed to be record typical luminous flux of 2400lm in pulse mode at an operating current of 6A. The increase in output is based on the two integrated blue chips using 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, says Osram Opto.

“Each chip in the new OSRAM OSTAR Compact 2x2 can be individually controlled, which means that the drivers can be individually designed – either for high voltage and low currents or vice versa,” says Wolfgang Schnabel, product manager for the OSTAR Compact series. “If high-voltage LED drivers are used the new LEDs not only provide greater system brightness but also greater system efficiency,” he adds. “The two chips can be connected in parallel or in series, with the latter providing higher efficiency and more readily available standard drivers.”

Tags: Osram LEDs LED projectors

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