Waveguide display device

Abstract: A waveguide 2 suitable for use in an augmented or virtual reality display comprising an: input structure 4; output structure 10; and intermediate diffractive structure 6 or 8 that provides one-dimensional light expansion. Light expansion is achieved by the diffractive features of the intermediate structure diffracting input light along the x-axis and then towards the output structure at a plurality of spaced positions. A second intermediate diffractive structure 8 or 6 may have diffractive features at a second angle that expand the light in an opposite direction to the first intermediate structure. The angles of the first and second diffractive features may be equal and opposite. The first 6 and second 8 gratings may be: spaced apart on the waveguide; or at least partially overlaid as a pair of crossed gratings (106, Fig. 2). The output diffractive structure 10 may comprises two diffractive optical elements, each provided in a photonic crystal, overlaid on one another in or on the waveguide. The two diffractive optical elements may receive light from the intermediate diffractive optical element and couple it towards the other diffractive optical element thus providing outcoupled orders towards a viewer (Fig. 7B or Fig. 8B).

Abstract: The invention discloses an optical waveguide structure, an AR equipment optical imaging system and AR equipment The optical waveguide structure comprises an optical waveguide main body, an entrance pupil region for coupling light information into the waveguide main body, a pupil expanding region for expanding the pupil of the light information coupled into the waveguide main body, and an exit pupil region for coupling the light information subjected to pupil expansion processing into human eyes The entrance pupil region, the pupil expanding region and the exit pupil region are arranged on asurface of the waveguide main body The entrance pupil area and the pupil expanding area adopt first gratings, and the exit pupil area adopts a second grating different from the first grating in implementation mode According to the system, the entrance pupil coupling efficiency is improved, an optimal pupil expanding mode is adopted, and the color diffraction stripe influence of the waveguide exit pupil region under the irradiation of ambient light is improved

Abstract: The invention relates to a light waveguide. The light waveguide includes a light waveguide body, wherein the light waveguide body includes a beam coupling-in region and a beam coupling-out region, thebeam coupling-in region is provided with a coupling-in grating and configured to couple a beam into the light waveguide body and make the beam propagate in the light waveguide body in a totally reflective manner, the beam coupling-out region is provided with a coupling-out grating, is configured to couple the beam propagated to the beam coupling-out region out of the light waveguide body and makes the beam not undergo secondary diffraction at the coupling-in the grating and has a continuous expansion exit pupil, and the coupling-out grating includes a transmissive coupling-out grating and a reflective coupling-out grating disposed on two sides of the light waveguide body parallel to the beam propagation direction. The invention further relates to a display device. Through arranging the transmissive coupling-out grating at the light outgoing surface of the light waveguide body and the reflective coupling-out grating on the first surface, the continuous expansion exit pupil can be obtained while the beam is guaranteed not undergo secondary diffraction at the coupling-in the grating.

Abstract: According to the present invention, a MicroLED-based display device for sending an image to a projection area includes a projection device and a transmission element The projection device emits imagelight based on a MicroLED The transmission element includes a coupling-in component, a conveying layer and a coupling-out member The projection device is arranged on the coupling-in component of the transmission element in a manner to align the image light The coupling-in component receives and guides the image light transmission The coupling-out component expands and outputs the image lightoutward The image that enters the conveying layer from the coupling-in component is totally reflected to a light output component, and then is conveyed to the projection area In addition, the present invention provides a MicroLED-based projection device and a display method thereof The display device balances on image generation and image transmission to improve the final display quality

Abstract: The invention discloses a projection display device comprising a lens, the rear side of the lens is provided with at least one imaging component, the imaging component comprises a mirror and a Micro LED screen corresponding to the mirror, A Fresnel lens assembly is disposed between the Micro LED screen and the mirror, the light generated by the Micro LED screen is refracted to the mirror via the Fresnel lens assembly and reflected by the mirror to the lens. The Micro LED screen in the present invention is a self-luminous display device, since the Micro LED screen can illuminate automatically,the setting of a light mixing distance between a light source and a display screen in the prior art is saved, therefore, the light stroke is reduced, and the overall size of the projection display device is reduced.

Abstract: The invention provides an optical device, including a light-transmitting substrate, optical means for coupling light into the substrate by total internal reflection, and a plurality of partially reflecting surfaces carried by the substrate, characterized in that the partially reflecting surfaces are parallel to each other and are not parallel to any of the edges of the substrate.

Abstract: An image display device of the present invention comprises projectors 20 and 21, a reflecting mirror 4, a screen 5, an image signal processor 1 which performs a distortion correction, and a base 6 for supporting the projectors 20 and 21, the reflecting mirror 4, and the screen 5. The projectors 20, 21, the reflecting mirror 4, and the screen 5 are assembled in one to constitute a single moving unit 7, and the image display device further comprises a lifting device 8 capable of moving the moving unit 7 in a vertical direction with respect to the base 6.

Abstract: A diffractive beam expander (50) comprises a substantially planar waveguiding substrate, an input grating (10) to provide an in-coupled beam (B1 ) propagating within said substrate, and an output grating (30) to provide an out-coupled beam. The expander (50) comprises also four or more further grating portions to expand the height of the in-coupled beam (B1 ). A part of the in-coupled light is diffracted by a first deflecting grating portion (21 a) to provide a first deflected beam. A part of the in-coupled light is diffracted by a second deflecting grating portion (22a) to provide a second deflected beam. The first deflected beam propagates downwards and the second deflected beam propagates upwards with respect to the in-coupled beam (B1 ). The first deflected beam impinges on a first direction-restoring grating portion (21 b) and the second deflected beam impinges on a second direction-restoring grating portion (22b). The first restoring grating portion (21 b) provides a first restored beam (V1 ) and the second restoring grating portion (22b) provides a second restored beam (V2), which both have the same direction as the in-coupled beam (B1 ). Out-coupling provides an output beam which is parallel to the input beam, and has a greater vertical dimension than said input beam.

Abstract: An eye tracker device (200) comprises a diffractive beam expander (207) to provide two substantially collimated illuminating light beams (B11, B12). The collimated light beams (B11, B12) provide two reflection spots (G1, G2) appearing in the image of the eye. The gaze direction (GZD) is calculated from the positions of the reflection spots (G1, G2) with respect to the pupil (P) of the eye (E1). The two illuminating beams (B11, B12) are provided by splitting an infrared laser beam (B4) into two in-coupled beams (B5, B6), which propagate in different directions in the substrate (7) of the beams expander. The in-coupled beams (B5, B6) are expanded and their light is subsequently coupled out of the substrate (7) by an out-coupling grating (230) to illuminate the eye (E1). The same substrate (7) may also be used to implement a virtual display device (100) for displaying virtual images to said eye (E1).

Abstract: A near-eye display of a type having an image generator for generating a succession of angularly related beams and waveguide for propagating the angularly related beams to an eyebox within which a virtual image is visible includes a controllable output aperture for such purposes as reconstructing a better defined pupil within the eyebox while also preserving the possibility for viewing the ambient environment from the eyebox through the controllable output aperture.