Fraunhofer FEP bets on quad-OLEDs for healthy VR

September 21, 2018 // By Julien Happich
The Fraunhofer FEP has designed a prototype of VR glasses packing no less than two WUXGA OLED microdisplays per eye (each with 1920×1200 pixels and offering a 2300ppi resolution), running at framerates up to 120Hz.

Limbak's ultra-compact VR headset.

To accomodate these OLED microdisplays, the prototype sports ultra-compact optics designed by project partner Limbak, which seamlessly combine two display chips per eye. All four WUXGA microdisplays give the headset a total resolution of 4800×1920 pixels, close to 5k. The new design is said to facilitate very high effective display resolutions and a wide field of view (over 100°) for an excellent immersive VR sensation. This new design aims to solve the challenges encountered by most of today's commercial VR glasses, often inducing 'motion sickness' for the wearer, partly because of low frame rates and image flickering, and partly by an inappropriate field of view.

Free-form ultra-compact optics combine two displays per eye.

The latest research results from the European funded project LOMID (Large cost-effective OLED microdisplays and their applications) are expected to solve these challenges: Large-area OLED microdisplays, combined with advanced free-form optics provide an ergonomic and lightweight solution for the design of VR glasses, and higher frame-rates will reduce the motion sickness for users.

The optics scientists of Limbak have been able to decrease the display-to-eye distance needed in the headset, lowering it to only 37mm (compared to 60-75 mm in most conventional headsets). This ultra-compact optical design reduces the headset size to about a quarter of the volume and half the weight of a conventional headset while maintaining the same field of view.

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