Multipurpose liquid crystal display having means for removably p

Details Multipurpose liquid crystal display having means for removably p Multipurpose liquid crystal display having means for removably p

1991-08-30

1992-07-21

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

G02F 113

Patent

active

051328232

ABSTRACT:
A multipurpose liquid crystal display, suitable for use as a reflective display and as overhead projection panel, includes (a) a first transparent electrode means; (b) a second transparent electrode means; (c) a display medium positioned between the first and second transparent electrode means, which display medium is switchable between a first state in which incident light is scattered and a second state in which the amount of such scattering is reduced; (d) a retroreflector removably positioned behind the second transparent electrode means; and (e) means for removably positioning the retroreflector behind the second transparent electrode. Preferably, the display medium comprises positive dielectric anisotropy, operationally nematic liquid crystals dispersed in a containment medium.

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