| 摘要 |
<p>An audio-visual storage unit having an electronically written display indicating a rental return time. The storage unit comprises a transparent substrate (15); a first transparent substrate (20) over such substrate; a layer (30) including cholesteric material; a dielectric layer having openings (40); a second conductor (42) provided over the dielectric layer and into the openings to be in contact with the cholesteric liquid crystal bearing layer which is effective at the position in such openings to be in at least first and second optical states so that written and viewed, be electrically changed by providing appropriate electrical fields to the material; and means for electrically addressing the cholesteric liquid crystal layer to erase previous information and writing appropriate information. <IMAGE></p> |
