Specification

Number of Layers in Waveguide

One to three FOV gratings per waveguide

Waveguide Thickness

Min 0.4 mm per waveguide

Glass or Plastic covers required for safety purposes

Optical Efficiency

Peak efficiency:  95%

Optical Transmission

98% at normal incidence for a basic waveguide layer

Angular Operating Range

Typically 5-25° bandwidth per waveguide layer

Haze

0.1% – 0.4% / Layer – Thickness Dependent

Light Source Compatibility

High efficiency over 20-50nm for Laser and LED only

Polarization

Polarization selective

Wavelength Response

Waveguides can be designed for 440nm – 1550nm

Switching Speed

Typically 40-400µs for current applications

Power Consumption

Typically <0.05 W/mm2

Environmental

<1% performance variation over 0-55C temperature range

Life Expectancy/MTBF

10,000 hr (room operation)

10,000 hr  storage (85C / 85RH)

Volume Supply

ISO9000, AS9000 (Aerospace Design & Manufacture)

Reliability

Batch tested to 5000 hours ( 85C/85RH accelerated life test)

Mobile Eyewear

 

Wearable displays using thin flat waveguides have been commercialized; but they have always missed the mark. The devices did not accommodate prescription lenses; and the front side mounted projectors were bulky, obscuring the user’s field of view. These ugly devices made the user seem like “automina’ – totally unacceptable to the vast majority of style conscious users.

DigiLens holographic waveguide optics provide an optical platform breakthrough, combining high index photopolymer materials, edge-lit holography and printed graded index substrates. These attributes enable the manufacture of eyeglass thin, highly functional curved optics. Inside the waveguide are proprietary functional elements, called “Optical IP Cores”. These cores replace conventional display optics for lensing, beam splitting,  de-speckling and other functional requirements. The cores are actually a toolbox of proprietary holographic optical volume bragg grating structures integrated within a graded index lightguide. As light propagates and sequentially interacts with the cores, the waveguide is able to magnify and project a microdisplay image into the user’s eyes.

The DigiLens display is essentially composed of two separate optical subsystems: an “image injection node” and a curved “DigiLens waveguide”. These combine to address a range of eyewear designs from a visor to spectacle lens. DigiLens cores are unique to printed waveguide optics, as they not only have wide angular bandwidth; but also can be electrically switched, allowing for additional laminated layers to add additional features like full color and eye tracking.