Study on monochromatic holographic planar waveguide display system

A monochromatic holographic planar waveguide display system consisting of an out-coupled linear holographic grating and an in-coupled volume holographic grating was designed. The working principle of the system is that, first the monochromatic image light wave information emitted by the micro-display passes through the collimating lens, then the image light wave information is coupled from one end of the planar glass and coupled to the other end by in-coupled volume holographic grating and out-coupled linear grating, and finally enters the human eye at the exit pupil position. Its characteristics of the holographic grating were introduced. The angle of view of the holographic grating was deduced theoretically using the coupled wave theory and the K-vector closed legitimate, and the design method of the holographic grating was introduced at the same time. The method divides the laser into object light wave and reference light wave by beam splitter, and realizes interference on the holographic plate according to a certain angle of incidence. The final simulation results show that the system displays a field of view angle of 18°×14°, an exit pupil distance of 30mm, and the modulation transfer functions (MTFs) are all above 0.3 at 30lp/mm, which satisfies the requirements of the visual system and can be applied to a new generation of helmet display systems.