Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1991-05-21
1993-06-22
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 63, G02F 1133, G02F 11335
Patent
active
052219780
ABSTRACT:
A liquid-crystal display device having an improved picture quality is obtained by rendering the iso-contrast curves rotationally symmetrical. This is obtained by means of a double cell construction, in which two identical TN-cells are present between two parallel polarizers, which TN cells are arranged relative to each other in such a manner that the director at the front face of the second cell encloses an angle of 180.degree. with the director at the front face of the first cell. A polarizer is provided between both cells, the direction of polarization of said polarizer extending perpendicularly to the direction of polarization of the two other polarizers.
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Broer Dirk J.
Heynderickx Ingrid E. J. R.
Mulkens Johannes C. H.
Gross Anita Pellman
Sikes William L.
Spain Norman N.
U.S. Philips Corporation
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