Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1991-08-19
1993-05-04
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 79, 340793, G02F 113
Patent
active
052086895
ABSTRACT:
An LCD device in which the pixels are divided into sub-pixels composed of one analog adjustable sub-pixel and a plurality of digitally controlled other sub-pixels. By combining a discrete adjustment of the (sub)-transmission levels of the other sub-pixels with an analog adjustment of transmission levels of the one sub-pixel, the total number of light transmission levels is increased considerably. The analog adjustment thus is less critical because the greater part of the ultimate level is defined by the accurate discrete adjustment.
REFERENCES:
patent: 5056893 (1991-10-01), Holz et al.
patent: 5157524 (1992-10-01), Dijon et al.
Esser Leonard J. M.
Hartmann Wilbert J. A. M.
Van Haaren Johannes A. M. M.
Verhulst Antonius G. H.
Franzblau Bernard
Mai Huy K.
Sikes William L.
U.S. Philips Corporation
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