DISPLAY SYSTEMS USING SCATTERING POLARIZERS
Original Publication Date: 1978-Feb-28
Included in the Prior Art Database: 2004-Mar-31
Xerox Disclosure Journal
In the Journal of the Optical Society of America, 41:957 (1951) Edwin Land described the so called scatt-Jng polar-izer. This device consists of double refracting crystallites imbedded in a plastic matrix whose index is equal to one of the principal indices of the birefringent crystals.
XEROX DISCLOSURE JOURNAL
DISPLAY SYSTEMS USING SCATTERING Proposed Classification
POLARIZERS U.S. Cl. 350/16OLC
Werner E.L. Haas mt. Cl. G02b 5/23
In the Journal of the Optical Society of America, 41:957
(1951) Edwin Land described the so called scatt~Jng polar-
izer. This device consists of double refracting crystallites
imbedded in a plastic matrix whose index is equal to one of the
principal indices of the birefringent crystals.
Such polarizers, when examined with an analyzer appear as
transparent as glass for one analyzer position and highly
diffusing when the analyzer is turned 900.
Several types of liquid crystal display cells are well suited
for use in conjunction with scattering polarizers. Twisted
nematic, Freedericksz transition and cholesteric-nematic
cells can be viewed between one linear and one scattering
In the case of twisted nematic cells (90° twist) the linear
polarizer is parallel to the direction of alignment of the
cell and to one of the principal directions of the scattering
polarizer. At zero field, light is rotated 90° by the twisted
nematic field. With the field applied the rotation is zero.
This effect, optióal rotation of 90° is ideal for use in
conjunction with the scattering polarizer.
For cholesteric-nematic phase transition cells, the plane of
vibration of the linear polarizer need only be parallel to the
matched index direction in the scattering polarizer. Without
an applied electrical field, scattering of the focal-conic
texture will be rein...