CURVED OPTICAL SEE-THROUGH THIN FREEFORM LIGHTGUIDE WITH LARGE FIELD OF VIEW IN EYEWEAR FORMFACTOR
First Claim
1. An optical device comprising:
- a microdisplay configured to emit light of a computer generated image (CGI);
a lightguide having a curved first surface at a top of the lightguide for receiving the CGI from the microdisplay and a curved second surface for reflecting the CGI through an eye-side third surface to a user eye; and
a head mountable frame supporting the microdisplay and the lightguide, wherein the microdisplay is positioned at a top of the head mountable frame, and wherein the first curved surface of the lightguide is at a top side of the lightguide.
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Accused Products
Abstract
An optical device includes a frame supporting a lightguide, a microdisplay, and a field lens positioned therebetween that directs light from the microdisplay into a top surface of the lightguide. Four optical surfaces of the lightguide include: a curved surface where light from the microdisplay enters a top of the lightguide, curved eye-side and world-side surfaces providing total internal reflection, and a combiner surface. The eye-side surface is used twice. Once in total internal reflection, and a second time as a refractive surface when light is reflected from the combiner surface and is thereby refracted out of the lightguide and directed towards a user'"'"'s eye. The field lens has a curved first surface oriented toward the microdisplay and a curved second surface oriented toward the top of the lightguide. The combiner surface combines ambient light from a world-side of the lightguide with light from the microdisplay.
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Citations
26 Claims
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1. An optical device comprising:
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a microdisplay configured to emit light of a computer generated image (CGI); a lightguide having a curved first surface at a top of the lightguide for receiving the CGI from the microdisplay and a curved second surface for reflecting the CGI through an eye-side third surface to a user eye; and a head mountable frame supporting the microdisplay and the lightguide, wherein the microdisplay is positioned at a top of the head mountable frame, and wherein the first curved surface of the lightguide is at a top side of the lightguide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An apparatus comprising:
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a display positioned at a top of a head wearable frame; a display lens for receiving light from the display; and a lightguide positioned near to the display lens to guide light from the display to an eye-ward direction, the lightguide including; a transparent curved first surface on an eye-side of the lightguide; a transparent curved second surface on a world-side of the lightguide; a transparent third surface oriented toward the display lens for receiving display light, the display light reflecting inside the lightguide via total internal reflection; and a transparent curved fourth surface shaped to reflect light from the display to a user eye and to combine the display light with ambient light entering from the world-side through the transparent curved second surface of the lightguide. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification