Laser-Illuminated Displays with Enhanced Uniformity and/or Eye Safety
AssigneeLumus Ltd.
InventorsYochay DANZIGER, Daniel MICHAELS
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Abstract
A display for displaying an image to a viewer includes an image generator having an illumination subsystem generating illumination of at least a first color, the image generator employing the illumination to generate an image. Projection optics projects illumination from the image for display to the viewer. The illumination subsystem includes a first laser generating a first laser beam of the first color with a first polarization and a second laser generating a second laser beam of the first color with a second polarization. The first and second polarizations are orthogonal at at least one location within the projection optics, thereby projecting a quasi-unpolarized image.
Claims13
-16. (canceled)
A display for displaying an image to a viewer, the display comprising:
- a. an image projector comprising:
- (i) a first laser illumination source configured to emit a first laser beam of a first color;
- (ii) a second laser illumination source configured to emit a second laser beam of the first color, the first and second laser beams being spatially separated;
- (iii) a scanning arrangement comprising at least one scanning mirror and at least one actuator deployed for displacing the scanning mirror, the scanning arrangement being configured to deflect light incident on the scanning arrangement to generate a two-dimensional scanning pattern;
- (iv) beam optics arranged to deliver the first laser beam and the second laser beam onto the scanning arrangement with differing directions of incidence;
- and
- (v) a display controller configured to vary an intensity of the first laser illumination source and an intensity of the second laser illumination source synchronously with operation of the scanning arrangement to generate the image;
- and
- b. a lightguide having a pair of mutually parallel major surfaces for supporting propagation of light by internal reflection at the major surfaces, the image projector being coupled to the lightguide so as to introduce the image to propagate within the lightguide, the lightguide further comprising a coupling out arrangement for coupling the collimated image out of the lightguide for viewing by the viewer,
- wherein, during generation of the image, the first laser beam and the second laser beam are deflected by the scanning arrangement to follow distinct scanning paths,
- and wherein the display controller modulates the intensities of the first laser beam and the second laser beam such that the distinct scanning paths generate substantially non-overlapping pixels of the image,
- and wherein the first laser beam and the second laser beam differ in at least one of wavelength and polarization.
Dependencies are inferred from the claim text.