Project display apparatus having diffusion element for reducing speckle
First Claim
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1. A projection display apparatus that performs an image display by projecting an image onto a screen, the projection display apparatus comprising:
- at least one light source that emits a coherent light flux;
an illuminating optical system that propagates the light flux from the light source into a predetermined optical path to guide the light flux to the screen;
a reflection-type light modulating unit that forms an image to be displayed on the screen on an illumination area illuminated with the light flux that is guided by the illuminating optical system; and
a projecting optical unit that projects the image that is formed on the illumination area onto the screen in a magnifying manner, whereinthe illuminating optical system includes a diffusing unit that diffuses the light flux from the light source, the diffusing unit being located at or near a position that is optically conjugate with an incident aperture of the projecting optical unit, a light-intensity equalizing element that equalizes an intensity distribution of the light flux from the light source, and a relay lens group that leads the light flux from the light-intensity equalizing element to the reflection-type light modulating unit,the position is near the relay lens group, andthe relay lens group includes the diffusing unit.
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Abstract
An illuminating optical system propagates a coherent light flux from at least one light source into a predetermined optical path to guide the light flux to a screen. A light bulb forms an image to be displayed on the screen on an illumination area illuminated with the light flux that is guided by the illuminating optical system. A projecting optical unit projects the image that is formed on the illumination area onto the screen in a magnifying manner. The illuminating optical system includes a diffusing unit that diffuses the light flux from the light source near a focusing position of the illuminating optical system.
8 Citations
18 Claims
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1. A projection display apparatus that performs an image display by projecting an image onto a screen, the projection display apparatus comprising:
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at least one light source that emits a coherent light flux; an illuminating optical system that propagates the light flux from the light source into a predetermined optical path to guide the light flux to the screen; a reflection-type light modulating unit that forms an image to be displayed on the screen on an illumination area illuminated with the light flux that is guided by the illuminating optical system; and a projecting optical unit that projects the image that is formed on the illumination area onto the screen in a magnifying manner, wherein the illuminating optical system includes a diffusing unit that diffuses the light flux from the light source, the diffusing unit being located at or near a position that is optically conjugate with an incident aperture of the projecting optical unit, a light-intensity equalizing element that equalizes an intensity distribution of the light flux from the light source, and a relay lens group that leads the light flux from the light-intensity equalizing element to the reflection-type light modulating unit, the position is near the relay lens group, and the relay lens group includes the diffusing unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A projection display apparatus that performs an image display by projecting an image onto a screen, the projection display apparatus comprising:
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, at least one light source that emits a coherent light flux; an illuminating optical system that propagates the light flux from the light source into a predetermined optical path to guide the light flux to the screen; a reflection-type light modulating unit that forms an image to be displayed on the screen on an illumination area illuminated with the light flux that is guided by the illuminating optical system; and a projecting optical unit that projects the image that is formed on the illumination area onto the screen in a magnifying manner, wherein the illuminating optical system includes a diffusing unit that diffuses the light flux from the light source, the diffusing unit being located at or near a position that is optically conjugate with an incident aperture of the projecting optical unit, a light-intensity equalizing element that equalizes an intensity distribution of the light flux from the light source, and a mirror group that leads the light flux from the light-intensity equalizing element to the reflection-type light modulating unit, the position is near the mirror group, and the mirror group includes the diffusing unit. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification
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Current AssigneeMitsubishi Electric Corporation
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Original AssigneeMitsubishi Electric Corporation
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InventorsKojima, Kuniko, Takeuchi, Hayato
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Primary Examiner(s)Luu; Thanh X
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Application NumberUS11/984,507Publication NumberTime in Patent Office1,289 DaysField of Search353/37, 353/50, 353/94US Class Current353/94CPC Class CodesG03B 21/28 Reflectors in projection be...
