G - Physics – 09 – F
Patent
G - Physics
09
F
G09F 9/35 (2006.01) G09F 13/00 (2006.01)
Patent
CA 2110532
LIQUID-CRYSTAL DISPLAY UNIT FOR ELECTRONIC DIRECTORY ABSTRACT OF THE DISCLOSURE A liquid-crystal display, preferably eighteen lines of forty characters each, is mounted in a case. The temperature of the display medium is held within operating limits for the display -- notwithstanding ambient temperature and humidity variations over generally normal ranges for at least the tem- perate zones, and even if the display unit receives direct sunlight. The unit works outdoors, at temperatures to at least 46 °C (115 °F) as well as in buildings with no temperature control. This is accomplished by use of a shading hood, and a window (preferably unperforated polycarbonate, curved, upward- and-outward-concave, and cylindrical-segment) that reflects to a viewer only light from the hood underside. No ventilating fan, plenum or other ventilating opening is needed. A circuit- board-mounted temperature sensor controls the contrast-adjust- ing voltage of the display -- using data in a digital-memory "look up" table. A heater is preferably provided, also temper- ature-controlled. The entire unit can be flush-mounted in a wall without disrupting operation. Visible glare arising in reflection at the window is reduced by the hood-and-window combination, without need for any antireflection coating on the window.
Ahlstrom John F.
Davis William R.
Greenthal Richard P.
Sentex Systems Inc.
Smart & Biggar
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