Patent application number | Description | Published |
20080304022 | Projection display - The invention provides a projection display that achieves continuous light amount control with ease and without causing unevenness of illumination of light applied to a light valve responsive to a video signal, thereby allowing constant image display with satisfactory contrast. The projection display of the invention includes a light valve ( | 12-11-2008 |
20090161032 | POLARIZATION OPTICAL SYSTEM AND PROJECTION-TYPE LIQUID-CRYSTAL DISPLAY DEVICE - A polarization optical system includes a first polarization plate, arranged at the light incident side of a liquid-crystal light valve, for transmitting first polarized light (s-polarized light) included in light incident on the liquid-crystal light valve from an illumination optical system and a second polarization plate, arranged at the light exit side of the liquid-crystal light valve, for transmitting second polarized light (p-polarized light), different from the first polarized light (s-polarized light), included in imaging light emitted from the liquid-crystal light valve to a projection optical system, in which the second polarization plate is configured in such a way that its light-incident face is concave toward the liquid-crystal light valve. | 06-25-2009 |
20100045944 | PROJECTION DISPLAY APPARATUS - A projection display apparatus includes a light valve, a light source for producing light directed to the light valve, an integrator lens disposed in an optical path extending from the light source to the light valve and including a first lens array and a second lens array, and a light amount adjustment mechanism disposed in the optical path between the first lens array and the second lens array. The light amount adjusting mechanism includes a pair of light shielding elements pivoting in the form of a pair of double doors. The pair of light shielding elements have an opening formed in a region of tip portions thereof which corresponds to lens cells in contact with the optical axis of the second lens array. A region of the opening corresponding to one lens cell in contact with the optical axis of the second lens array is of a triangular configuration. | 02-25-2010 |
20100165296 | Projection Display Apparatus - A projection display apparatus | 07-01-2010 |
20120008107 | PROJECTION DISPLAY - The invention provides a projection display that achieves continuous light amount control with ease and without causing unevenness of illumination of light applied to a light valve responsive to a video signal, thereby allowing constant image display with satisfactory contrast. The projection display of the invention includes a light valve ( | 01-12-2012 |
20120033421 | LIGHT SOURCE DEVICE AND PROJECTION TYPE DISPLAY APPARATUS - The light source device in which a first light source lamp, a second light source lamp and a relay optical system are arranged so that there is no part where an optical axis of a first light flux from the first light source lamp through a relay optical system to an entrance end of a light intensity equalizing element and an optical axis of a second light flux from the second light source lamp to the entrance end agree with each other, and the optical axis of the first light flux immediately before incidence on the entrance end and the optical axis of the second light flux from the second light source lamp to the entrance end are substantially parallel to each other. | 02-09-2012 |
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 |
20140198301 | LIGHT SOURCE APPARATUS AND PROJECTOR - A light source apparatus according to the present invention includes a phosphor wheel having a phosphor disposed in an annular shape on a disk-shaped base material, the phosphor serving to emit fluorescent light from excitation light, thereby forming an excitation light source having a predetermined color, and the phosphor having a discontinuous portion in a part of the annular shape, an excitation light source for emitting the excitation light with which a passage position of the circular phosphor is irradiated with respect to the phosphor wheel to be rotatively driven by the wheel motor, and a controller that controls light emission of the light source and the excitation light source synchronously with a position of the discontinuous portion with respect to an irradiation position of the excitation light. | 07-17-2014 |
20140354956 | LIGHT SOURCE DEVICE AND PROJECTION-TYPE DISPLAY APPARATUS - A light source device includes a first light source that emits light of a first polarization, and a second light source that emits light of a second polarization whose polarization direction is different from the light of the first polarization by 90 degrees. A combined wavelength band of the light of the first polarization and the light of the second polarization is a first wavelength band. A third light source emits light of a third polarization and of a wavelength band which is different from the first wavelength band, and a fourth light source emits light of a fourth polarization whose polarization direction is different from the light of the third polarization by 90 degrees. A combined wavelength band of the light of the third polarization and the light of the fourth polarization is a second wavelength band which is different from the first wavelength band. A reflecting element reflects the light of the first polarization. A first selective transmission element transmits the light of the first polarization and reflects the light of the second polarization based on the polarization direction of the light. A second selective transmission element transmits combined light of the light of the first polarization and the light of the second polarization, and reflects the light of the third polarization based on the wavelength band of the light. A third selective transmission element transmits the combined light of the light of the first polarization and the light of the second polarization based on the polarization of the wavelength band, transmits the light of the third polarization and reflects the light of the fourth polarization based on the polarization direction of the light. The light of the first polarization, the light of the second polarization and the light of the third polarization passing through the third selective transmission element, and the light of the fourth polarization reflected by the third selective transmission element proceed in the same direction. | 12-04-2014 |