Virtual image display device
First Claim
1. A virtual image display device comprising:
- a light source that emits a light beam;
a polarization direction switch that switches a polarization direction of the light beam emitted from the light source between a first polarization direction and a second polarization direction;
an image generator that generates image light from the light beam emitted from the light source;
a first optical path through which the light beam having the first polarization direction travels;
a second optical path through which the light beam having the second polarization direction travels, an optical path length of the second optical path being longer than an optical path length of the first optical path; and
a light reflector that projects the light beam emerging from the first and second optical paths such that the projected light from the first optical path forms an image that is displayed as a virtual image at a first distance from an observer and the projected light from the second optical path forms an image that is displayed as another virtual image at a second distance farther than the first distance from the observer.
1 Assignment
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Accused Products
Abstract
A virtual image display device includes a light source unit, a polarization switching unit, an image generation unit, an optical path unit and a projection unit. The polarization switching unit switches a polarization direction of a light beam emitted from the light source unit. The optical path unit includes a first optical path through which the light beam having the first polarization direction travels and a second optical path through which the light beam having the second polarization direction travels. A first virtual image is displayed at a first distance with the light beam that has traveled through the first optical path. A second virtual image is displayed at a second distance farther than the first distance with the light beam that has traveled through the second optical path.
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Citations
14 Claims
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1. A virtual image display device comprising:
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a light source that emits a light beam; a polarization direction switch that switches a polarization direction of the light beam emitted from the light source between a first polarization direction and a second polarization direction; an image generator that generates image light from the light beam emitted from the light source; a first optical path through which the light beam having the first polarization direction travels; a second optical path through which the light beam having the second polarization direction travels, an optical path length of the second optical path being longer than an optical path length of the first optical path; and a light reflector that projects the light beam emerging from the first and second optical paths such that the projected light from the first optical path forms an image that is displayed as a virtual image at a first distance from an observer and the projected light from the second optical path forms an image that is displayed as another virtual image at a second distance farther than the first distance from the observer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification