Loading patent…
AssigneeHitachi, Ltd.
InventorsTetsu Ohishi, Hiroki Yoshikawa, Satoshi Ouchi, Taro Imahase, Tomohiro Miyoshi
Estimating the term…
A projection type image display apparatus includes a light axis moving unit for moving a direction of a light from a light source substantially in parallel periodically at a predetermined rate, a light separating unit for separating the light from the light axis moving unit into a plurality of color light components of predetermined wavelength bands, and a radiation unit for radiating the color light components from the light separating unit on an image display device, projecting an optical image corresponding to the image signal in enlarge form.
An image display apparatus for separating the light from a light source into a plurality of color light components of predetermined wavelength bands and radiating the separated light components periodically on an image display device to project an optical image corresponding to the image signal in an enlarged form, comprising:
An image display apparatus for separating the light from a light source into a plurality of color light components of predetermined wavelength bands and radiating the separated light components periodically on an image display device to project an optical image corresponding to the image signal in an enlarged form, comprising:
An image display apparatus for separating the light from a light source into a plurality of color light components of predetermined wavelength bands and radiating the separated light components periodically on an image display device to project an optical image corresponding to the image signal in an enlarged form, comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
For use with reflective spatial light modulators: having a single light modulator for all colour channels
Optical devices or arrangements for the control of light using movable or
For use with transmissive spatial light modulators: having a single light modulator for all colour channels
Operating by reflection only: including stacked surfaces having at least one double-pass partially reflecting surface
Term end not estimated
The present invention relates to an image display apparatus such as a liquid crystal projection apparatus, a reflection type image display projection apparatus or a projection type display apparatus for projecting an image on the screen using an image display device such as a transmission type liquid crystal panel or a reflection type image display device as a light bulb, or in particular to a technique whereby the light from a light source is separated into color light components of predetermined wavelength bands and radiated periodically on an image display device. In this way, the light from the light source of an image display apparatus for projecting an optical image corresponding to an image signal in enlarged form is separated into color light components of predetermined wavelength bands and radiated on the image display device.
In the image display apparatus, an image display device is required for each color because a color image is obtained by projecting the image for each of the colors including red, green and blue, for example, having predetermined wavelengths at a single point. In view of the fact that the image display device is expensive on the one hand and the need of saving energy on the other hand, however, a method has been employed in which images of a plurality of colors are displayed with a single image display device.
The conventional image display apparatus comprising a single image display device will be explained with reference to FIG. 7.
FIG. 1 is a diagram showing an optical configuration of an image display apparatus according to a first embodiment of this invention.
FIGS. 2A to 2F are schematic diagrams for explaining the principle of the image display apparatus and diagrams for explaining the distribution of the light radiated on the image display device according to the invention.
FIG. 3 is a diagram showing an optical configuration of an image display apparatus according to a second embodiment of this invention.
Several embodiments of the invention will be explained below with reference to the accompanying drawings.
FIG. 1 is a diagram showing an optical configuration according to a first embodiment of the invention, and illustrates an image display apparatus using a single transmission type image display device as a light bulb.
In FIG. 1, reference numeral 1 designates a light source unit, numeral 2 a light source, numeral 3 a reflector, numeral 4 an optical axis moving unit for moving the position of the optical axis of the light radiated, numeral 5 a light separating unit for separating the light into light fluxes having a plurality of predetermined wavelength bands of such as red, green and blue color components, numeral 6 a display device for modulating and displaying the light, numeral 7 a projection unit for projecting, in enlarged form, the image light modulated by the display device, and numeral 8 a screen.