Turning light pipe for a pupil expansion system and method
First Claim
Patent Images
1. A near eye optical display, comprising:
- a projector configured to provide an image;
a light pipe comprising a plurality of elongated surfaces, the light pipe being configured to expand the image in a first direction through one of the elongated surfaces, wherein light associated with the image travels through the light pipe by striking three or more of the elongated surfaces; and
a waveguide comprising an output grating, a first surface, a second surface, and a side surface, the first surface and the second surface being an opposing surfaces, and having a larger area than the side surface, the output grating being configured to provide the image expanded in a second direction, the second direction being different than the first direction, wherein the image enters the waveguide from the one of the elongated surfaces of the light pipe.
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Abstract
A display system includes a light pipe including elongated surfaces. The light pipe is configured to expand the image in a first direction through one of the elongated surfaces. The display also includes a waveguide including an output grating, a first surface, a second surface, and a side surface. The first surface and the second surface have a larger area than the side surface, the output grating being configured to provide the image expanded in a second direction. The second direction is different than the first direction. The image enters the waveguide from the one of the elongated surfaces.
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Citations
20 Claims
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1. A near eye optical display, comprising:
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a projector configured to provide an image; a light pipe comprising a plurality of elongated surfaces, the light pipe being configured to expand the image in a first direction through one of the elongated surfaces, wherein light associated with the image travels through the light pipe by striking three or more of the elongated surfaces; and a waveguide comprising an output grating, a first surface, a second surface, and a side surface, the first surface and the second surface being an opposing surfaces, and having a larger area than the side surface, the output grating being configured to provide the image expanded in a second direction, the second direction being different than the first direction, wherein the image enters the waveguide from the one of the elongated surfaces of the light pipe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of displaying information, the method comprising:
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receiving light in a light pipe having at least four elongated surfaces, the light striking the four elongated surfaces and traveling at least partially by total internal reflection within the light pipe; receiving the light from one of the at least four elongated surfaces in a waveguide having a first surface and a second surface; providing the light to an output grating via total internal reflection between the first surface and the second surface; and providing the light from the waveguide via the output grating, where the light is provided with dual axis pupil expansion with respect to the light received in the light pipe. - View Dependent Claims (12, 13, 14, 15)
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16. An apparatus for providing an image, the apparatus comprising:
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a light pipe comprising at least four elongated surfaces, each elongated surface connecting to at least two other of the elongated surfaces, the light pipe being configured such that light associated with an image strikes the at least four elongated surfaces as the light travels in a corkscrew or helical fashion within the light pipe; and a waveguide comprising an input surface and an output surface, wherein the light from the light pipe is received at the input surface and the light is ejected from the output surface of the waveguide by an output grating. - View Dependent Claims (17, 18, 19, 20)
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Specification