| 摘要 |
PCT No. PCT/US84/00324 Sec. 371 Date Nov. 1, 1984 Sec. 102(e) Date Nov. 1, 1984 PCT Filed Mar. 1, 1984 PCT Pub. No. WO84/03577 PCT Pub. Date Sep. 13, 1984.The device comprises a two-dimensional display panel (20) composed of interchangable unit modular (24). Each module is composed of display elements which are nematic or smectic LCD cells. Half-tones may be produced by either changing the contrast of the LCD or in subdividing each display element into several unit cells which are, as desired, switched to light or dark and thus producing the impression of a more or less dark dot. The device serves to communicate information in the form of fixed or changing images or sign groups and can also be used for advertisement.
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