Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1987-03-13
1988-10-18
Birmiel, Howard A.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340783, 34081527, 40449, G08B 526
Patent
active
047790822
ABSTRACT:
The invention provides a display matrix system using display elements of the electromagnetic type. The system differs from others in that the currents applied to the display elements are unidirectional as there are no electrical switching components per element. This reduces the drive circuitry needed for the matrix. Selection of the display elements relies on current pulses of variable width.
In accordance with an aspect of the invention each one of a row or column of coils are connected together by N conductors, such that it is only necessary to drive 1/N of the coils in a row or column at a time:
In accordance with a further aspect of the invention means are provided which enable variation in the electrical pulse width applied to a display element in response to variation of one of ambient temperature and supply voltage.
REFERENCES:
patent: 3469258 (1969-09-01), Winrow
patent: 3775881 (1973-12-01), Salam
patent: 4069480 (1978-01-01), Helwig
patent: 4139841 (1979-02-01), Roberts
patent: 4163332 (1979-08-01), Salam
patent: 4383255 (1983-05-01), Grandjean et al.
patent: 4564836 (1986-01-01), Vuilleumier
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