Dual function electro-optical display device exhibiting a bistable image or a fugitive image depending the applied voltage
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United States of America Patent
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Feb 18, 1997
Grant Date -
N/A
app pub date -
Apr 3, 1995
filing date -
Apr 3, 1995
priority date (Note) -
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Abstract
A dual function electro-optical display device operates as a bistable display when driven at one voltage, and operates as a nematic display when driven at another voltage. In the first mode, the image in the display zone is formed by applying a first electrical signal to the device, and the image persists upon removal of the first electrical field. In the second mode, the image is formed by applying a second electrical signal to the device, and the image disappears upon removal of the second electrical signal. In a liquid crystal display, the liquid crystal fluid (9) is a blend of at least one liquid crystal nematic compound and at least one liquid crystal cholesteric compounds, and is maintained in a gap (4) between two substrates (1).
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