Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1992-11-20
1994-05-31
Gross, Anita P.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 53, 359 68, G02F 113, G02F 1133, G02F 1335
Patent
active
053174313
ABSTRACT:
A liquid crystal display device including a first liquid crystal layer having a dichroic dye contained therein, and a second liquid crystal layer having light scattering properties. The first and the second liquid crystal layers are stratified separately from each other and superposed one above the other between a pair of glass plates. A color filter is provided on one of the plates. The threshold voltage of the first liquid crystal layer is, for example, lower than the threshold voltage of the second liquid crystal layer (V.sub.1 <V.sub.2). Accordingly, when the voltage applied to the liquid crystal is lower than the threshold voltage (V.sub.1) of the first liquid crystal layer, the light is absorbed by the dichroic dye to produce a black spot. When the voltage is higher than the threshold voltage (V.sub.1) of the first liquid crystal layer and lower than the threshold voltage (V.sub.2) of the second liquid crystal layer, the second liquid crystal layer becomes white and cloudy thereby producing a white spot on the display. When voltage is higher than the threshold voltage (V.sub.2), the light transmits both first and second liquid crystal layers, and the color filter can be directly visualized.
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Hanaoka Kazutaka
Yoshida Hidefumi
Fujitsu Limited
Gross Anita P.
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