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US 4,440,473 AGranted
Voltage polarity switching means for cholesteric liquid crystal displays
AssigneeFuji Xerox Co., Ltd.
InventorSouichi Sekimoto
Life of this patent
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Abstract
A display device particularly adapted for use with a microfilm reader, in which an illuminating light source need be activated only in an initial reading stage. A first transparent electrode, a liquid crystal layer, a semiconductor layer and a second transparent electrode are stacked together in the stated order. A voltage is applied between the first and second transparent electrodes which is switched in a polarity between an initial reading mode and a display mode.
Claims9
A display device comprising:
- a first transparent electrode;
- a film layer having an electro-optical effect comprising a layer of nematic liquid crystal material containing several to several tens of percent of cholesteric liquid crystal material;
- a photosensitive film layer and a second transparent electrode, said first transparent electrode, said film layer having an electro-optical effect said photosensitive film layer and said second transparent electrode being stacked together in the stated order;
- means for providing a d.c. voltage across said first and second transparent electrodes;
- and means for switching the polarity of said d.c. voltage applied across said first and second transparent electrodes.
2 more elements
A display device comprising:
- a first transparent electrode;
- a film layer having an electro-optical effect comprising a layer of nematic liquid crystal material containing several to several tens of percent of cholesteric liquid crystal material;
- a photosensitive film layer and a second transparent electrode, said first transparent electrode, said film layer having an electro-optical effect said photosensitive film layer and said second transparent electrode being stacked together in the stated order;
- means for providing a d.c. voltage across said first and second transparent electrodes;
- means for switching the polarity of said d.c. voltage applied across said first and second transparent electrodes;
- a light source;
- a microfilm;
- a reflector for directing light from said light source toward said microfilm;
- a condenser lens disposed between said light source and said microfilm;
- a projecting lens receiving light passing through microfilm;
- and a mirror for refracting light passing through said projecting lens onto said photosensitive film layer.
8 more elements
Dependencies are inferred from the claim text.