| 摘要 |
Rewritable signs ( 100, 1300 ) that include bistable cholesteric liquid crystal layers ( 102, 1402, 1404, 1406 ) are provided. According to one embodiment a rewritable sign ( 100 ) is devoid of circuitry for establishing electric fields in localize regions for writing information to the rewritable sign ( 100 ), and is consequently inexpensive. In the latter embodiment, a separate information writer ( 400 ) that includes an array of pixel electrodes ( 404 ) that is driven by an active matrix ( 602 ) is used to write information on the rewritable sign. According to another embodiment a rewritable sign ( 1300 ) includes three cholesteric liquid layers ( 1402, 1404, 1406 ) each of which reflects a different primary color. The three cholesteric liquid crystal layers ( 1402, 1404, 1406 ) are interleaved with sets of conductive lines ( 1316, 1320, 1322, 1324 ) that are used to apply signals to the cholesteric liquid crystal layers ( 1402, 1404, 1406 ) for the purpose of writing information.
|
