Wave Optics Ltd

Sumanta Talukdar

David Grey

A display system is disclosed for use in an augmented reality display (), the system comprises a waveguide () having a front surface and a rear surface. A front input projector () projects polychromatic light through a front surface, and a back input projector () projects polychromatic light through the rear surface. Input light impinges on an input grating () on a rear surface of the waveguide (), and light travels through the waveguide by total internal reflection. An output grating () is provided for coupling light out of the waveguide. A plurality of front and back input projectors () are provided in a staggered configuration along the width of the waveguide () and respective edges of adjacent front and back input projectors are aligned along the width of the waveguide to permit a continuous projection of light.

Display system

An optical device is disclosed for expanding input light in two dimensions in an augmented reality display. The device comprises a waveguide () and three linear diffraction grat-ings H, H, H. An incident beam from a projector illuminates an input grating Hwith polychromatic light, and the light is coupled into the waveguide (). The other two gratings H, Hare overlaid on top of one another. Light can be diffracted by one grating Hinto a first diffracted order and towards the other grating Hwhich can couple the light out of the waveguide () towards a viewer. In another arrangement the crossed gratings H, Hmay be replaced by a photonic crystal () having a regular array of pillars () which create a number effective diffraction gratings.

Exit pupil expanding diffractive optical waveguiding device

An optical device is disclosed for expanding input light in two dimensions in an augmented reality display. The device comprises a waveguide () and three linear diffraction gratings H, H, H. An incident beam from a projector illuminates an input grating Hwith polychromatic light, and the light is coupled into the waveguide (). The other two gratings H, Hare overlaid on top of one another. Light can be diffracted by one grating Hinto a first diffracted order and towards the other grating Hwhich can couple the light out of the waveguide () towards a viewer. In another arrangement the crossed gratings H, Hmay be replaced by a photonic crystal () having a regular array of pillars () which create a number effective diffraction gratings.

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Maidenhead, United Kingdom

Sumanta Talukdar