Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2005-05-03
2005-05-03
Lee, Michael G. (Department: 2876)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S115000, C349S175000, C349S182000, C349S151000, C349S152000, C345S087000
Reexamination Certificate
active
06888607
ABSTRACT:
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.
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Fredley David S.
Kelley Ronald J.
Landreth Bobby Dean
Muthuswamy Sivakumar
Pennisi Robert W.
Karpinia Randi L.
Lee Michael G.
Lee Seung H
Motorola Inc.
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