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Blue laser module gives 2000lm boost to projectors

Posted: 19 Jun 2014 ?? ?Print Version ?Bookmark and Share

Keywords:projector? blue laser? module? Osram?

Osram Opto Semiconductors GmbH unveiled the said first compact laser multi-chip package for projectors, housing up to 20 blue laser chips in a 25.5mm by 35mm module. Featuring an overall output of 50W, the module can give laser projectors a brightness level of more than 2000 lumen.

The PLPM4 450 module adapts the "butterfly" package, accommodating four copper bars with up to five blue laser chips connected in series and operated at 2.3A each. It is said to achieve an efficiency of 30 per cent, with a typical electrical input of 165W, and wavelengths of 440nm to 460nm.

PLPM4 450

The multi-chip package provides a blue light output of 50W. Source: Osram

Blue laser diodes in combination with a converter wheel, which converts part of the blue light into the two primary colours of red and green, are used as the light source for laser projectors. More than 20 individual laser diodes had to be combined previously to achieve sufficient brightness for professional applications. With the optical output of the laser module, installing several modules in a projector will result in brightness levels exceeding 5000 lumen for enabling devices in large conference rooms.

To achieve the high optical output of the module, the developers optimised the chip parameters to double the single-chip output from 1.6W to 3.2W, and also improved the thermal resistance of the module.

The special design and the improved optical output power of the individual chip significantly reduce the price per optical watt of the module, according to Osram. Another price benefit comes from the greatly reduced production costs in which installation and alignment of a multi-chip package involve less time and lower costs than for a large number of individual TO packages. The radiation from all the laser chips can therefore be collimated with a single lens array.

Volume production of the module will start at the end of 2014. Samples are expected to be available this month. The Osram Speciality Lighting Business Unit will also be integrating the multi-chip package in a new generation of phaser light modules for projection applications. Phaser in this case is a hybrid word formed from phosphor and laser. Phaser light modules based on the multi-chip package will feature a particularly compact design and will be capable of being used in combination, making them very easy to integrate in existing projector architectures.

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