Displays including light-guide optical elements with two-dimensional expansion
AssigneeLumus Ltd.
InventorsRonen Chriki, Tsion Eisenfeld
Life of this patent
Estimating the term…
Abstract
A display (10) includes a flat light-guide optical element (LOE) (100) having first and second progressive deflection arrangements associated with first and second regions (110, 120) of the LOE. A support arrangement (106), such as a glasses frame, supports the LOE in facing relation to the eye of the user. An image projector (200) injects a collimated image into the LOE via a reflective coupling-in surface (131). The reflective coupling-in surface is preferably obliquely oriented to both the major horizontal and vertical axes of the LOE. A multi-component wedge (132) is preferably used to compensate for chromatic aberration.
Claims9
A display for directing image illumination to an eye-motion box for viewing by an eye of a user, the display comprising:
- (a) a light-guide optical element (LOE) formed from transparent material, said LOE having:
- (i) a set of mutually-parallel major external surfaces,
- (ii) a first progressive deflection arrangement associated with said LOE in a first region of said LOE, and
- (iii) a second progressive deflection arrangement associated with said LOE in a second region of said LOE;
- (b) a support arrangement configured for supporting said LOE relative to the head of the user with one of said major external surfaces in facing relation to the eye of the user and in an orientation relative to the eye of the user such that an X axis parallel to said major external surfaces is oriented horizontally, a Y axis being parallel to said major external surface and perpendicular to said X axis;
- (c) an image projector configured to project a collimated image from a projector aperture, said collimated image including a principal ray aligned with an optical axis of said image projector;
- (d) a reflective coupling-in surface;
- and
- (e) a transparent wedge element deployed in an optical path between said image projector and said reflective coupling-in surface, said transparent wedge element providing an input surface associated with said projector aperture and
- an output surface parallel to one of said major external surfaces of said LOE, said LOE, said image projector and said reflective coupling-in surface being arranged such that the collimated image projected from said image projector passes through said transparent wedge element, is deflected by reflection at said reflective coupling-in surface and coupled into said LOE so as to propagate in a first direction within said LOE by internal reflection at said major external surfaces towards said first region, is redirected by said first progressive deflection arrangement so as to propagate in a second direction within said LOE by internal reflection at said major external surfaces towards said second region, and is redirected by said second progressive deflection arrangement so as to be coupled out of said LOE towards the eye of the user, and wherein said transparent wedge element is formed from at least two wedge components formed from materials having different dispersive properties, the collimated image projected from said image projector being transmitted through said at least two wedge components.
Dependencies are inferred from the claim text.