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US 3,947,721 AGranted
Liquid crystal device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKeniti Suenami, Kazuhiko Shimizu, Kazuo Ogata
Life of this patent
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Abstract
A dc rejection circuit is provided between each output of a diode matrix circuit and a corresponding segment electrode in a liquid crystal display panel. The dc rejection circuit may comprise a very simple structure comprising a combination of a resistor and a capacitor thereby providing a liquid crystal display device which is inexpensive and yet ensuring a long service life.
Claims3
A liquid crystal display system comprising:
- an AC power source;
- a liquid crystal display panel having a common electrode and a plurality of segment electrodes, said segment electrodes being arranged to form desired symbols;
- diode matrix means;
- selection switch means having a first contact coupled to said AC power source and a plurality of second contacts, each second contact on said selection switch means being coupled through said diode matrix means to said display panel for energization of the segment electrodes of said display panel corresponding to a specific symbol to be displayed, and
- Dc rejection circuit means interposed between said diode matrix means and said display panel, said DC rejection circuit means applying only the AC components of the voltages at the outputs of said diode matrix means across the common electrode and selected segment electrodes of said liquid crystal display panel.
2 more elements
Dependencies are inferred from the claim text.