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| Number | Title | Issue Date |
| 7866829 | Optical diaphragm, projector, correction parameter calibrator, and correction parameter calibrating method An optical diaphragm for adjusting an amount of an incident light beam, includes: light shielding vanes that are configured movably, and move to change an opening area enabling a passage of the light beam, thereby adjusting the amount of the light beam; an electroma... | 01/11/2011 |
| 7841725 | Image display device and projector An image display device includes a first optical modulator that modulates a plurality of color lights coming from a light source, a color combination member that combines the color lights, a second optical modulator that modulates a light provided by the color combi... | 11/30/2010 |
| 7677739 | Projector A projector includes a lens cover which is slidable relative to a chassis for covering and exposing a projection aperture of a projection lens. A detecting section includes a light emitting portion which projects a light beam and detects the opened state or closed s... | 03/16/2010 |
| 7661829 | Projection display apparatus A projection display apparatus is provided which offers improved contrast while smoothly controlling the amount of light, with a simple structure and without deterioration of lifetime due to the heat of the light from a light source. This projection display apparatu... | 02/16/2010 |
| 7413313 | Optical shutter with rotational axis in light path of projection device An apparatus, system, and method for an optical shutter with a rotational axis in the light path of a projection device are disclosed herein. ... | 08/19/2008 |
| 7399088 | Pupil mismatch in a collimated display system An image projection system has a first lens with a defined entrance pupil. An image source has an image field and a defined exit pupil. The exit pupil of the image source is configured such that the exit pupil of the image source underfills the entrance pupil of the... | 07/15/2008 |
| 7374289 | Projection type video display A shutter device can switch between a state where illuminating light from a lamp of an illuminating device is blocked (referred to as a closing state of the shutter device) and a state where illuminating light passes through (referred to as an opening state of the s... | 05/20/2008 |
| 7357519 | Optical projection device An optical projection device including a light source, a housing, an imaging unit, a projection lens and a dust protection device is provided. The light source is adopted for providing a light beam. The housing has a projection-lens-assembling opening. The imaging u... | 04/15/2008 |
| 7354159 | Projection type video display A shutter device can switch between a state where illuminating light from a lamp of an illuminating device is cut off (referred to as a closing state of the shutter device) and a state where illuminating light passes through (referred to as an opening state of the s... | 04/08/2008 |
| 7344255 | Light amount adjusting apparatus and projector using the same At least a pair of light amount adjusting plates is allocated at peripheral side rim portions of a light path through which light from a light source is projected. These light amount adjusting plates are drivable between a narrow-down position in which they enter in... | 03/18/2008 |
| 7338174 | Shutter device and projection type video display Each shading plate comprises a rotating shaft and a driving shaft arranged vertically. First divided shading plate is loosely fitted to and supported by (not adhere to) the rotating shaft and rotates around the shaft. Second divided shading plates are fixed to the r... | 03/04/2008 |
| 7332855 | Phosphor blends for wavelength conversion and white light emitting device using the same The present invention provides a phosphor blend for wavelength conversion and a white light emitting device using the phosphor blend. Further disclosed is a white light emitting phosphor blend comprising 0.5˜18 wt % of A5(PO4)3Cl:Eu... | 02/19/2008 |
| 7284868 | Compact projection systems using multiple light sources The invention relates to a projection system using multiple light sources (1) at the same time. The projection system (100) comprises multiple light sources (1), a lens array system for each of the light sources (1), a condenser lens (... | 10/23/2007 |
| 7220006 | Method and apparatus for increasing effective contrast ratio and brightness yields for digital light valve image projectors The present invention is a method and apparatus for increasing the effective contrast ratio and brightness yields for digital light valve image projectors using a variable luminance control mechanism (VLCM), associated with the projector optics, for modifying the li... | 05/22/2007 |
| 7210795 | Light quantity adjusting device and projector apparatus using the same A light quantity adjusting device for adjusting light quantity of a projector apparatus. The adjusting device includes a substrate having an optical path opening and a blade guide surface having level differences in a direction perpendicular to the optical path; a p... | 05/01/2007 |
| 7207679 | Projection type video display A video signal processing circuit inputs a video signal to perform processing such as frequency conversion as well as processing for generating data representing the APL (Average Picture Level) of a frame video for each frame period. A microcomputer functions as a d... | 04/24/2007 |
| 7204597 | Outer suspension type lens shielding mask for projection apparatus An outer suspension type lens shielding mask for a projection apparatus including a sheet body and holding element, in which a rectangular hole is opened in the sheet body, and the sheet body is combined with the holding element to be fixed on a projection apparatus... | 04/17/2007 |
| 7198370 | Illumination apparatus An apparatus including a spatially modulated extended light source configured to project an output having at least one region of diminished illumination, and an array of polarizing beam splitters (PBSs) positioned proximal to the spatially modulated extended light s... | 04/03/2007 |
| 7194169 | Notched adjustable aperture An adjustable aperture system includes a stationary aperture operable to remove a portion of a lower intensity light communicated through a light bundle. The system also includes an adjustable aperture comprising a notch and capable of varying an amount of projectio... | 03/20/2007 |
| 7185986 | Projection type video display apparatus, light deflection device in projection type video display apparatus, and direct-view type video display apparatus In a projection type video display apparatus comprising means for circularly scrolling and irradiating irradiated light in a direction perpendicular to the line direction on a hold-type display panel, a projection type video display apparatus comprises means for var... | 03/06/2007 |
| 7165848 | Projection type video display A doughnut-shaped dust-proof plate is externally fitted in the body of the projection lens. The dust-proof plate comprises a first member which is flexible like rubber and a second member made of plastic which is uneasy to deform. The second member is made lower in ... | 01/23/2007 |
| 7140737 | Projection system using spatial filter A projection system that can adjust color balance of incident light is provided. The projection system includes a light source, a spatial filter, an optical separator, a scrolling unit, a light valve, and a projecting lens unit. The spatial filter has a slit to adju... | 11/28/2006 |
| 7131734 | Projection system using spatial filter A projection system that can adjust color balance of incident light is provided. The projection system includes a light source, a spatial filter, an optical separator, a scrolling unit, a light valve, and a projecting lens unit. The spatial filter has a slit to adju... | 11/07/2006 |
| 7070284 | Projector apparatus A projector apparatus includes digital micromirror device (DMD) Color temperature and adjustment of white balance with respect to projection light can be detected in a light condition in a convenient manner. A position of the picture formed by the projection light o... | 07/04/2006 |
| 7070285 | Blanking device and projector having the same The present invention is to provide a blanking device of projector, comprising a blanking piece having at least one transparent part such that by installing the blanking piece at the optical path of the projector, it is possible to blank the projection of the projec... | 07/04/2006 |
| 7055965 | Projection type video display A shutter device comprises a plurality of shutters. Each of the shutters is provided at a position in the vicinity of a fly's eye lens positioned on the side of a polarization conversion system (one of fly's eye lenses in an integrator lens) and not preventing the p... | 06/06/2006 |
| 6827451 | Multiple light valve lighting device or apparatus with wide color palette and improved contrast ratio An apparatus is disclosed comprising a lamp which produces a first light which may be a white light; a first light valve, a second light valve, a first color separator, and a first aperture device. The first color separator receives the white light from the lamp, an... | 12/07/2004 |
| 6726335 | Shutter for image projection system An image projection system comprises an image projector, such as a film or television projector and a projection screen. The projection screen is fabricated of a substantially transparent material, such as glass or plastic. The screen of transparent material has one... | 04/27/2004 |
| 6648476 | Projection type image display apparatus A projection type image display apparatus comprises a variable stop mechanism adapted to regulate the size of effective luminous flux diameter at a predetermined position in the optical path from an illumination optical system to a projection lens system,... | 11/18/2003 |
| 6609797 | Projector with adjustably positioned image plate A projector is often positioned so that its optical axis is at an imperfect orthogonal angle with respect to a projection screen. This position causes a keystone distortion as well as imperfect focus in the projected image. To correct these undesirable pr... | 08/26/2003 |
| 6575577 | Multiple light valve lighting device or apparatus with wide color palette and improved contrast ratio An apparatus is disclosed comprising a lamp which produces a first light which may be a white light; a first light valve, a second light valve, a first color separator, and a first aperture device. The first color separator receives the white light from t... | 06/10/2003 |
| 6572232 | Image projection system An image projection system comprises an image projector, such as a film or television projector and a projection screen. The projection screen is fabricated of a substantially transparent material, such as glass or plastic. The screen of transparent mater... | 06/03/2003 |
| 6561653 | Multiple light valve lighting device or apparatus with wide color palette and improved contrast ratio An apparatus is disclosed comprising a lamp which produces a first light which may be a white light; a first light valve, a second light valve, and a first aperture device, which may be a first electronically switchable filter. The first aperture device o... | 05/13/2003 |
| 6505939 | Projection system comprising at least two light sources having a unique optical arrangement with respect to at least one spatial light modulator Projection system comprising at least two light sources, a projection lens and a spatial light modulator located between the light sources and the projection lens, which light modulator comprises a plurality of light-deflection devices each provided with ... | 01/14/2003 |
| 6361171 | Projector with adjustably positioned image plate A projector is often positioned so that its optical axis is at an imperfect orthogonal angle with respect to a projection screen. This position causes a keystone distortion as well as imperfect focus in the projected image. To correct these undesirable pr... | 03/26/2002 |
| 6296359 | Cinematic film projector In a cinematic film projector a light source projects light through a single, non-centric light transparent transmission window formed in a rotary shutter, and through an image window and an image of a film which passes step by step past the image window ... | 10/02/2001 |
| 6220730 | Illumination obscurement device An illumination obscurement device for controlling the obscurement of illumination from a light source which is optimized for use with a rectangular, arrayed, selective reflection device. In a preferred embodiment, a rotatable shutter with three positions... | 04/24/2001 |
| 5957560 | Light shutter projector with a fluorescent screen Disclosed is a ferroelectric liquid crystal display projector employing a fluorescent screen, including a light source emitting light of a predetermined wavelength; a first condensing lens for converting the light radiated from the light source into beams... | 09/28/1999 |
| 5813742 | Layered display system and method for volumetric presentation A volumetric display system includes a display member which has a plurality of electrically-responsive optical shutters arranged in a layered relationship. The optical shutters include layers of a liquid crystal which preferably can be formed in geometric... | 09/29/1998 |
| 5690407 | Shutter for display device of projection type A shutter has a cylindrical take-up member rotatable about the central shaft thereof, and a thin board having one end portion thereof fixed to the outer peripheral surface of the take-up member and deformable into a state rolled on the outer peripheral su... | 11/25/1997 |
