Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1991-05-24
1993-10-12
Brier, Jeffery A.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
G09G 336
Patent
active
052529550
ABSTRACT:
A liquid-crystal display, preferably twenty-five lines of eighty characters each, is mounted in a case. The temperature of the display medium is maintained within operating limits for the display--notwithstanding ambient temperature and humidity variations over generally normal ranges for at least the temperate zones, and even if the display unit is placed to receive direct sunlight. The unit works outdoors as well as in buildings that lack temperature control. This is accomplished preferably by circulating air from outside the case through a space between the display face and an unperforated protective polycarbonate window. Intake and exhaust plena are long and narrow enough to deter manual access to the display and thus van dalism; however, the plena are straight and sufficiently free of obstructions that the fan can be a very small, low-power, quiet unit. A temperature sensor controls the fan, and also the contrast-adjusting voltage of the display --based on data in a digital-memory "look up" table. A heater is preferably provided, also temperature-controlled. The plena face downward so that the unit is not sensitive to rain, and the entire unit can be flush-mounted in a wall without disrupting system cooling. Visible glare arising in reflection at the window is reduced by an antireflection coating on the window.
REFERENCES:
patent: 2977412 (1961-03-01), Rhodes et al.
patent: 4045791 (1977-08-01), Fukai et al.
patent: 4117542 (1978-09-01), Klausner et al.
patent: 4268126 (1981-05-01), Mumford
patent: 4352274 (1982-10-01), Anderson et al.
patent: 4435732 (1984-03-01), Hyatt
patent: 4521079 (1985-06-01), Leenhouts et al.
patent: 4727934 (1988-03-01), Eckel et al.
patent: 4763993 (1988-08-01), Vogeley et al.
patent: 4847602 (1989-07-01), Altland et al.
patent: 5027111 (1991-06-01), Davis et al.
Davidson Richard A.
Davis William R.
Greenthal Richard P.
Mowers Dennis W.
Szymanski Paul
LandOfFree
Liquid-crystal display unit for electronic directory does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Liquid-crystal display unit for electronic directory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liquid-crystal display unit for electronic directory will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1907584