Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1986-03-18
1988-07-05
Caldwell, Sr., John W.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340782, 340762, G08B 536
Patent
active
047558075
ABSTRACT:
A device for the display of data, comprising on the one hand a matrix of luminous dots (11a, 11b, . . . 11n) each of which is constituted by at least one pair of light-emitting diodes arranged in anti-parallel with the color of the light emitted by one diode of the pair being different from that of the other diode, and comprising on the other hand, an electric a.c. voltage supply source (16) whose output terminals (17 and 18) can be coupled to the supply terminals of the luminous dots by electronic switches (25a, 25b . . . 25m) controlled by a control signal generator (30). A color variation requirement, referred to as "background" of the sign, is obtained by rendering the electronic switches (25a, 25b, . . 25m) conducting during one and/or the other cycles of the supply voltage, while the data to be displayed are formed by the assembly of luminous dots (11i, 11j) whose connections are connected to the supply source (16) in accordance with a polarity which is inverse to that of other luminous dots which constitute the complementary "background" hue.
REFERENCES:
patent: 4271408 (1981-06-01), Teshima et al.
patent: 4321598 (1982-03-01), Warner
patent: 4488149 (1984-12-01), Given
patent: 4560901 (1985-12-01), Thillays
Caldwell Sr. John W.
Miller Paul R.
Oberley Alvin
U.S. Philips Corp.
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