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Multi-colour laser light source improves image quality

11 Apr 2014  | Paul Buckley

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Laser light source

Usability and image quality in advanced projection applications—such as smart glasses and other wearable augmented reality devices—take a leap forward with the development of a multi-colour laser light source by EpiCrystals Inc. of Finland.

More companies than ever before have recently introduced emerging wearable electronics devices like near-to-eye displays (NTE) or head-mounted displays. The common solution to form an image is to use a 5in to 7in LED/OLED screen or LCOS with a LED light source. The result is often either bulky or the image quality is poor due to washed out colours, low contrast and resolution. A lightweight see-through image with excellent (3D) quality provided to both eyes in a wide viewing angle is the preferred solution. Heads-up display for the automotive industry is facing similar challenges in providing great image quality while not disturbing the driver.

"Unlike conventional light sources, our laser does not emit any visible spontaneous emission which limits the achievable contrast and quality," said VP of Business Development Tomi Jouhti of EpiCrystals. "When our laser is turned on, only stimulated laser emission is in use, giving rise to infinite contrast—finally black is black, and the grey box in the background seen in projected images today is now gone."

'We also want to provide our customers with a light source solution which makes system design and production easier than ever. A single very small module with precisely aligned beams and low operating voltage of 2V is the key here. We will continue developing even smaller, less power consuming and more cost-effective solutions to answer the needs of the industry," he added.

EpiCrystals has started shipping pre-production samples to partners and customers.

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