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US 6,742,897 B1Granted
Liquid crystal projector device
AssigneeFujitsu General Limited
InventorShinichiro Tajiri
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AssigneeFujitsu General Limited
InventorShinichiro Tajiri
Estimating the term…
A liquid crystal projector device, wherein an s-polarization PBS (4) forms light from a light source (1) a set of s-polarization components; an optical unit (7) reflects a green-region light and rotates by 90° the planes of polarization of a blue-region light and red-region light for outputting as p-polarization lights by reflection; a PBS (8) reflects an s-polarization green-region light and transmits p-polarization blue-region and red-region lights which are then separated from each other by a dichroic prism (9); the s-polarization green-region light is modulated into a p-polarization projected image light and reflected by a reflection type liquid crystal sheet (10G) to transmit the PBS (8); the p-polarization blue-region and red-region lights shine on reflection type liquid crystal sheets (10B, 10R) and are modulated respectively into s-polarization projected image lights, reflected and synthesized by the dichroic prism (9) before being reflected by the PBS (8) for projection by a projection lens (11).
A liquid crystal projector device designed so that white light from a light source is reflected by a total reflection mirror and polarized light rays incident on three reflection liquid crystal panels for red color range, green color range and blue color range are modulated and reflected into image-forming light rays to be synthesized for being projected, and additionally comprising an optical unit comprising a first dichroic layer for transmitting a light ray of a specified color range while reflecting light rays of other color ranges, a retarding layer for rotating by 90° the plane of polarization of the light ray which has passed through the first dichroic layer and a total reflection layer for totally reflecting the light ray from the retarding layer.
A liquid crystal projector device designed so that white light from a light source is reflected by a total reflection mirror and polarized light rays incident on three reflection liquid crystal panels for red color range, green color range and blue color range are modulated and reflected into image-forming light rays to be synthesized for being projected, and additionally comprising an optical unit comprising a second dichroic layer having a gradient dichroic characteristic for transmitting a light ray of a specified color range while reflecting light rays of other color ranges, a retarding layer for rotating by 90° the plane of polarization of the light ray which has passed through the second dichroic layer and a third dichroic layer having a predetermined gradient dichroic characteristic for reflecting the light ray coming from the retarding layer.
A liquid crystal projection device designed so that polarized light rays incident on three reflection liquid crystal panels for red color range, green color range and blue color range are modulated and reflected into synthesized image-forming light rays for being projected, and additionally comprising an optical unit comprising a first dichroic layer for transmitting a light ray of a specified color range while reflecting light rays of other color ranges, a retarding layer for rotating by 90° the plane of polarization of the light ray passing through the first dichroic layer and a total reflection layer for totally reflecting the light ray from the retarding layer and a reflection unit comprising a dichroic layer having a dichroic characteristic similar to that of the first dichroic layer and a transmitting layer that will not produce a phase difference provided before the optical unit so that a difference in optical path occurring in the optical unit resulting from the incidence of unparallel light rays can be corrected.
A liquid crystal projection device designed so that white light from a light source is reflected by a total reflection mirror and polarized light rays incident on three reflection liquid crystal panels for red color range, green color range, and blue color range are modulated and reflected into synthesized image-forming light rays for being projected, and additionally comprising an optical unit comprising a first dichroic layer for reflecting a light ray of a specified color range while transmitting light rays of other color ranges, a retarding layer for rotating by 90° the plane of polarization of the light rays passing through the first dichroic layer and a total reflection layer for totally reflecting the light rays from the retarding layer.
Dependencies are inferred from the claim text.