Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1989-12-05
1992-12-15
Hille, Rolf
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 40, 359 68, 359106, 353 20, G02F 113
Patent
active
051722542
ABSTRACT:
A projection-type liquid crystal display apparatus uses liquid crystal cells as light polarizing devices. This apparatus makes a polarization control of one of the two linearly polarized light components perpendicular to each other separated by the polarizing light separating device through the first liquid crystal cell and of the other of the two through the second liquid crystal cell. The liquid crystal cells directly transmit through, a linearly polarized light component incident upon pixel portions corresponding to bright pixels of an image to be projected on the screen. Further they transmit through the one incident upon pixel portions corresponding to dark pixels of the image by converting it into the other linearly polarized light component. This apparatus composes the first linearly polarized light transmitted through pixel portions of the first liquid crystal cell corresponding to bright pixels of the image and the second linearly polarized light transmitted through pixel portions of the second liquid crystal cell corresponding to the same bright pixels as the above-mentioned bright pixels through a polarized light composing device, and projects the composed light onto a screen through an optical device.
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Atarashi Hisashi
Takafuji Yutaka
Hille Rolf
Ho Tan
Sharp Kabushiki Kaisha
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