Optical waveguide with coherent light source
First Claim
1. An optical waveguide comprising:
- a front surface;
a rear surface; and
a first optical element configured to;
allow light from a coherent light source to enter the optical waveguide through the front surface, wherein the light has a coherence length, wherein the coherent light source comprises a laser; and
a second optical element configured to;
allow a first portion of the light to exit the optical waveguide through the rear surface with a first optical path length; and
allow a second portion of the light to exit the optical waveguide through the rear surface with a second optical path length, wherein a difference between the first optical path length and the second optical path length is greater than the coherence length.
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Accused Products
Abstract
A waveguide increases the optical path of a portion of light received from a coherent light source. The waveguide includes a first element that allows light from an exit pupil of a coherent light source to enter the waveguide, and a second element that directs some of the entered light to exit the waveguide through a first set of pupils. The waveguide includes additional elements that cause the remaining light to make an additional path through the waveguide and the second element before exiting through a second set of pupils to increase the path of the exiting light. The pupils of the first set and the second set are staggered so that light exiting a pupil does not interfere with the light exiting via the neighboring pupils.
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Citations
17 Claims
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1. An optical waveguide comprising:
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a front surface; a rear surface; and a first optical element configured to; allow light from a coherent light source to enter the optical waveguide through the front surface, wherein the light has a coherence length, wherein the coherent light source comprises a laser; and a second optical element configured to; allow a first portion of the light to exit the optical waveguide through the rear surface with a first optical path length; and allow a second portion of the light to exit the optical waveguide through the rear surface with a second optical path length, wherein a difference between the first optical path length and the second optical path length is greater than the coherence length. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A head mounted display device comprising:
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a coherent light source; a controller coupled to the coherent light source and configured to cause the coherent light source to project light comprising a display image, wherein the light has a coherence length; and a plurality of optical waveguides, wherein each optical waveguide comprises; a first end; a second end; a first optical element configured to; allow the light to enter into the optical waveguide; and cause the light to traverse in a first direction towards the first end; a second optical element configured to; receive the light traversing in the first direction from the first optical element; and allow a first portion of the light traversing in the first direction to exit out of the optical waveguide, wherein the first portion of light has a first optical path length; and a third optical element configured to; receive a second portion of the light traversing in the first direction from the second optical element; and cause a third portion of the light to traverse in a second direction towards the second end, wherein the second optical element is further configured to; receive the third portion of the light traversing in the second direction from the third optical element; and allow a fourth portion of the light traversing in the second direction to exit out of the optical waveguide, wherein the fourth portion of the light has a second optical path length, and further wherein a difference between the first optical path length and the second optical path length is greater than the coherence length. - View Dependent Claims (9, 10, 11, 12, 13)
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14. An optical waveguide comprising:
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a first surface and a second surface; a first optical element that allows light received from a coherent light source to enter the optical waveguide through the first surface or second surface and traverse in a first direction within the optical waveguide, wherein the light has a coherence length; a second optical element that receives the light traversing in the first direction, causes a first portion of the light to exit the optical waveguide through the first surface or the second surface, and allows a second portion of the light to continue to traverse in the first direction, wherein the first portion of light has a first optical path length; and a third optical element that receives the second portion of the light traversing in the first direction, and causes a third portion of the light to traverse in a second direction within the optical waveguide, wherein the second optical element further receives the third portion of the light, and allows a fourth portion of the light to exit the optical waveguide through the first surface or the second surface, wherein the fourth portion of light has a second optical path length, and further wherein a difference between the first optical path length and the second optical path length is greater than the coherence length. - View Dependent Claims (15, 16, 17)
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Specification