Sequential control method for a display assembly including two superposed display devices
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United States of America Patent
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Dec 30, 2003
Grant Date -
Jun 13, 2002
app pub date -
Nov 19, 2001
filing date -
Dec 11, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sequential control method for a display assembly including two superposed, respectively top (22; 46) and bottom (24; 48), display devices, the top display device (22; 46) including at least a liquid crystal display cell (26, 28; 50) and being arranged so as to be transparent in a first state to make the bottom display device (24; 48) visible, and so as to display a data item and to be opaque and reflective and to mask at least partially the bottom display device (24; 48) in a second state, control means supplying a control voltage to cause the top display device (22; 46) to pass from the first state to the second state and vice versa, characterised in that the display assembly is made to enter an operating state in which the top display device (22; 46) automatically switches into the state in which it is transparent or into the state in which it is opaque and reflective, so that the display assembly passes alternately from a mode displaying data via the top display device (22; 46) to a mode displaying data via the bottom display device (24; 48).
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