Ultra-slim, mid-air display based on planar DOE waveguide

Enlarged mid-air image display based on slim DOE waveguide

“…The working principle of forming floating images stays the same as in our former paper 1 , without mentioning enlargement of image size, more efficient light and waveguide area usage. Illumination from the projector passes through the projection optics, gets in-coupled into in-coupling DOE, propagates along the planar waveguide and consequently gets out-coupled from the out-coupling DOE, further being converged by the Fresnel lens forming a floating image.…”

“…In this paper, we use a similar design concept, as in our former work 1 , though significant changes regarding waveguide DOE architecture and projection optics were introduced. In particular, proposed mid-air image display consists of a compact image projector including custom-made projection optics, a DOE-based large aperture ultra-slim waveguide and a slim Fresnel lens with converging optical power (fig.…”

“…Vectors of 2D out-coupling DOE are directed at ±120° angle to in-coupling grating vector. Such approach allows to reduce inefficient out-coupling DOE areas in comparison with conventional DOE architecture when in-coupling DOE is located not at the corner 1 . Corresponding waveguide model (rear view of the waveguide, shown in the fig.…”

“…As a continuation of our work 1 on the mid-air display based on planar DOE waveguide, we elaborated a new DOE architecture design for enlarged effective waveguide out-coupling aperture, in particular, 245 x 145 mm 2 . We use the described in the paper 1 approach of mid-air image formation using a converging lens and improve MAD light efficiency by a custom design of new projection optics.…”

“…As a continuation of our work 1 on the mid-air display based on planar DOE waveguide, we elaborated a new DOE architecture design for enlarged effective waveguide out-coupling aperture, in particular, 245 x 145 mm 2 . We use the described in the paper 1 approach of mid-air image formation using a converging lens and improve MAD light efficiency by a custom design of new projection optics. Formed floating images between the display and the viewer bring understanding of the main system parameters: mid-air image size and relief, mid-air image field of view (FoV), quality (uniformity, resolution, brightness), etc.…”