Projector using a small-size optical system
First Claim
1. A small-size liquid-crystal projector comprising:
- a liquid-crystal display;
a back-light for illuminating the liquid-crystal display;
a projecting optical device including a refracting element having a half-mirror coat on a curved surface thereof, a circularly polarized light selecting semitransparent mirror and a quarter-wave plate interposed between the liquid-crystal display and the circularly polarized light selecting semitransparent mirror, which components are disposed in turn from the liquid-crystal display side; and
optical correcting means for optically correcting distortion of a projectable image.
1 Assignment
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Accused Products
Abstract
A small and light liquid-crystal projector, a projector making a combination with a head-mounted display and a small-and-light projector device for projecting an image or three-dimensional image from the HMD onto a common screen: the HMD has, in its casing, an optical device for enlarging an image of a liquid-crystal panel illuminated by a back light, which device comprising a reflection type refracting element with a half-mirror coat and a cholesteric liquid crystal element acting as circularly-polarized-light selecting semitransparent mirror; a base unit with which the HMD is connected to form a projector device has, in its housing, an optical correcting portion, a projector back-light, a light-source changing portion and a mechanism for inserting the optical correcting portion for correcting the curvature of a projectable image; when assembling the HMD with the base unit, the light-source changing portion acts so as to illuminate the liquid crystal panel with intensive back-light though a parabolic mirror and, at the same time, the optical correcting portion is inserted into a optical path.
99 Citations
5 Claims
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1. A small-size liquid-crystal projector comprising:
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a liquid-crystal display; a back-light for illuminating the liquid-crystal display; a projecting optical device including a refracting element having a half-mirror coat on a curved surface thereof, a circularly polarized light selecting semitransparent mirror and a quarter-wave plate interposed between the liquid-crystal display and the circularly polarized light selecting semitransparent mirror, which components are disposed in turn from the liquid-crystal display side; and optical correcting means for optically correcting distortion of a projectable image. - View Dependent Claims (4, 5)
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- 2. A small-size liquid-crystal projector which comprises a head-mounted display (hereinafter abbreviated as HMD), said HMD comprising a liquid-crystal display, a back-light for directly viewing the liquid-crystal display, a refracting element having a half-mirror coat on a curved surface thereof, a circularly polarized light selecting semitransparent mirror, a quarter-wave plate interposed between the liquid-crystal display and the circularly polarized light selecting semitransparent mirror, which components are disposed in turn from the liquid-crystal display side, and a base unit that is usable in combination with the HMD and includes a projection back-light, back-light selecting means for switching from the liquid-crystal back-light to the projector back-light and vice versa, and optical correcting means insertable in an optical path of the HMD for optically correcting distortion of a projectable image.
Specification