OPTICAL DEVICE, AND VIRTUAL IMAGE DISPLAY
First Claim
1. An image display device comprising:
- an image display element;
an optical system;
an optical waveguide;
a transparent substrate; and
a first diffraction grating and a second diffraction grating each of which is on a portion of the optical waveguide,a light shield,wherein,the optical waveguide is configured to receive light from the image display element via the optical system, andthe light shield is configured to prevent leakage of the light through the first diffraction grating from the image display element.
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Accused Products
Abstract
A virtual image display device with an optical waveguide to guide, by internal total reflection, parallel pencil groups meeting a condition of internal total reflection, a first reflection volume hologram grating to diffract and reflect the parallel pencil groups incident upon the optical waveguide from outside and traveling in different directions as they are so as to meet the condition of internal total reflection inside the optical waveguide and a second reflection volume hologram grating to project the parallel pencil groups guided by internal total reflection inside the optical waveguide as they are from the optical waveguide by diffraction and reflection thereof so as to depart from the condition of internal total reflection inside the optical waveguide.
28 Citations
8 Claims
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1. An image display device comprising:
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an image display element; an optical system; an optical waveguide; a transparent substrate; and a first diffraction grating and a second diffraction grating each of which is on a portion of the optical waveguide, a light shield, wherein, the optical waveguide is configured to receive light from the image display element via the optical system, and the light shield is configured to prevent leakage of the light through the first diffraction grating from the image display element. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A head mounted display system comprising:
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an image display element; an optical system; an optical waveguide; a transparent substrate; and a first diffraction grating and a second diffraction grating each of which is on a portion of the optical waveguide, a light shield, wherein, the optical waveguide is configured to receive light from the image display element via the optical system, and the light shield is configured to prevent leakage of the light through the first diffraction grating from the image display element.
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Specification