Patent application number | Description | Published |
20080252863 | Projection display apparatus - 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. | 10-16-2008 |
20090135480 | Fresnel lens sheet, light-transmission screen, and projection image display apparatus - The Fresnel lens sheet according to the present invention has a plurality of prismatic Fresnel lens elements including a Fresnel facet, a riser facet, and a top facet crossing the facet and the riser facet on an entrance surface. An angle of the top facet of each Fresnel lens element constituting the lens relative to the an exit surface, δ | 05-28-2009 |
20100033686 | PROJECTION-TYPE DISPLAY APPARATUS - An image formed on a reflecting optical modulator is magnified by a projection optical system and projected on a backside of a transmission-type screen. The projection optical system is constituted so that a product of an F-number and a projection magnification of the projection optical system is less than 400. | 02-11-2010 |
20100134883 | TRANSPARENT SCREEN, PROJECTION DISPLAY DEVICE, AND METHOD OF RECEIVING CONTROL SIGNAL LIGHT - A transparent screen is constructed in such a way that a plurality of Fresnel prisms | 06-03-2010 |
20100165301 | PROJECTION-TYPE DISPLAY APPARATUS - A projection-type display apparatus that projects an image on a screen and performs image display includes at least one laser source that emits a coherent light beam, an illuminating optics that propagates the light beam emitted from the laser source into a predetermined optical path to guide the light beam to the screen, a reflective optical modulator that forms the image to be displayed on the screen on an illuminated surface illuminated by the light beam guided by the illuminating optics, and a projection optics that magnifies and projects the image formed on the illuminated surface of the reflective optical modulator on the screen. The illuminating optics includes a diffusion device, which diffuses the propagated light beam, and is arranged on a light propagation path near a conjugated position with the reflective optical modulator. | 07-01-2010 |
20100188745 | TRANSPARENT SCREEN, PROJECTION DISPLAY DEVICE, AND IMAGE DISPLAY METHOD - A Fresnel lens screen | 07-29-2010 |
20100290114 | TRANSMISSION-TYPE SCREEN, PROJECTION-TYPE DISPLAY DEVICE, AND IMAGE DISPLAYING METHOD - A transmission-type screen includes an entering-side Fresnel lens that inflects image light from a light emitter toward a display side using a prism formed on a rear-surface side, which is a light-entering-surface side of the image light; a first light diffusing unit that is provided on the display side with respect to the entering-side Fresnel lens and diffuses the image light from the entering-side Fresnel lens; a second light diffusing unit provided on the display side with respect to the first light diffusing unit, diffuses the image light from the first light diffusing unit, causes the diffused image light to exit toward the display side, and configured to change a relative position thereof to the first light diffusing unit; and a second substrate that holds the second light diffusing unit while being provided on the display side with respect to the second light diffusing unit. | 11-18-2010 |
20130038846 | PROJECTION DISPLAY DEVICE - A projection display device has an illumination optical system that includes a light-intensity equalization element, a first optical system, and an aperture regulation member. The aperture regulation member is disposed at a position that is not optically conjugate with the screen, and the aperture regulation member has at least one of the following, using measured or calculated relative illuminances at each of multiple segments of the image formation region or screen: an aperture expansion part provided at a position corresponding to a segment with a low relative illuminance, the aperture expansion part being a cutout that narrows the light-blocking section and widens the aperture section; an aperture contraction part provided at a position corresponding to a segment with a high relative illuminance, the aperture contraction part being a protrusion that widens the light-blocking section and narrows the aperture section. | 02-14-2013 |