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Patent of the Month

In May 2023’s edition of the International Hologram Manufacturers’ Association (IHMA) patent newsletter more than 100 patents are listed, among them two from semiconductor wafer processing equipment manufacturer, AMS International, in the Holographic Displays section of the newsletter.

The first is for a selective volume holographic waveguide device that generates an eyebox of a display. The device comprises (i) a first volume phase holographic (VPH) grating (202) configured to selectively diffract incident light according to its wavelength and/or angle of incidence to couple the diffracted light into the waveguide device, (ii) one or more second VHP gratings (206) configured to selectively diffract the coupled light according to wavelength and/ or angle through the waveguide, (iii) one or more third VPH grating (203) configured to selectively diffract the light propagating along the waveguide so as to decouple the light from the waveguide. In this way, each beam of light is steered, so that collectively they generate the eyebox of a display (204).