DITHERING METHODS AND APPARATUS FOR WEARABLE DISPLAY DEVICE
First Claim
1. A device comprising:
- an input coupling grating having a first grating structure characterized by a first set of grating parameters, wherein the input coupling grating is configured to receive light from a light source;
an expansion grating having a second grating structure characterized by a second set of grating parameters varying in at least two dimensions, wherein the second grating structure is configured to receive light from the input coupling grating; and
an output coupling grating having a third grating structure characterized by a third set of grating parameters, wherein the output coupling grating is configured to receive light from the expansion grating and to output light to a viewer.
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Abstract
A device includes an input coupling grating having a first grating structure characterized by a first set of grating parameters. The input coupling grating is configured to receive light from a light source. The device also includes an expansion grating having a second grating structure characterized by a second set of grating parameters varying in at least two dimensions. The second grating structure is configured to receive light from the input coupling grating. The device further includes an output coupling grating having a third grating structure characterized by a third set of grating parameters. The output coupling grating is configured to receive light from the expansion grating and to output light to a viewer.
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Citations
20 Claims
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1. A device comprising:
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an input coupling grating having a first grating structure characterized by a first set of grating parameters, wherein the input coupling grating is configured to receive light from a light source; an expansion grating having a second grating structure characterized by a second set of grating parameters varying in at least two dimensions, wherein the second grating structure is configured to receive light from the input coupling grating; and an output coupling grating having a third grating structure characterized by a third set of grating parameters, wherein the output coupling grating is configured to receive light from the expansion grating and to output light to a viewer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An optical structure comprising:
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a waveguide layer lying at least partially in a plane defined by a first dimension and a second dimension; and a diffractive element coupled to the waveguide layer and operable to diffract light in the plane, wherein the diffractive element is characterized by a set of diffraction parameters that vary in at least the first dimension and the second dimension. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification