Holographic waveguide display with large field of view based on volume holographic grating

The field of view (FOV) of waveguide display systems based on volume holographic grating (VHG) is primarily constrained by the diffraction response bandwidth, which is currently insufficient to meet the need for AR immersive displays. Through the composite diffraction response bandwidths, red-responsive and green-responsive double-layer VHG structures are proposed to expand the FOV under varied image sources. The influence of several input spectral bandwidths on FOV improvement is also considered, and OLED micro-display and LCOS micro-display are selected as image sources. As a consequence, the horizontal FOV of the red-responsive double-layer VHG waveguide based on the LCOS micro-display is 19.5 degrees, and that of the green-responsive double-layer VHG waveguide based on the OLED micro-display is 33.4 degrees. Through the simulation and experiment, we effectively illustrate the effect of the double-layer VHG and the input spectral bandwidth on the FOV.