Communications: electrical – Visual indication – Seven-segment indicator
Patent
1999-06-23
2000-08-01
Wu, Daniel J.
Communications: electrical
Visual indication
Seven-segment indicator
340580, 340640, 340324, 340336, 345 34, 345 46, 345117, 345 54, 315152, G09F 900
Patent
active
060973021
ABSTRACT:
A monitoring system for a display unit includes phototransistors for detecting light emitted from a plurality of selectively energizable light-emitting diode (LED) segments in an energized state and for generating a voltage which is representative of the light emitted from the LED segments in the energized state. A glass filter filters ambient light from the phototransistors and passes the light emitted from the LED segments in the energized state. A comparator for each of the LED segments generates a comparison signal, with the comparison signal being representative of a comparison between a predetermined reference voltage and the voltage for each of the LED segments. A conditional power supply conditionally energizes the LED segments in response to an energizing signal. A routine of a central processing unit generates display data. The CPU receives the comparison signal for each of the LED segments and generates the energizing signal in order to operate the conditional power supply when the comparison signal for each of the LED segments indicates that each of the LED segments is operating fault-free. A control block cooperates with the conditional power supply and the CPU for selectively gating the display data to the LED segments.
REFERENCES:
patent: 3573814 (1971-04-01), Lang
patent: 3790946 (1974-02-01), Hendricks
patent: 4095217 (1978-06-01), Tani et al.
patent: 4214391 (1980-07-01), Angst
patent: 4242677 (1980-12-01), Jonath
patent: 4247852 (1981-01-01), Utzinger
patent: 4297692 (1981-10-01), Maier
patent: 4311993 (1982-01-01), Strobel
patent: 4408869 (1983-10-01), Tomosada et al.
patent: 4420748 (1983-12-01), Jurgen
patent: 4541066 (1985-09-01), Lewandowski
patent: 4592003 (1986-05-01), Kobayashi et al.
patent: 4644341 (1987-02-01), Warner
patent: 4654629 (1987-03-01), Bezos et al.
patent: 4734688 (1988-03-01), Adams
patent: 4847606 (1989-07-01), Beiswenger
patent: 4951037 (1990-08-01), Goossen
patent: 5160920 (1992-11-01), Harris
patent: 5406301 (1995-04-01), Ravid
patent: 5446564 (1995-08-01), Mawatari et al.
patent: 5515390 (1996-05-01), Benton
patent: 5559528 (1996-09-01), Ravid et al.
patent: 5703607 (1997-12-01), Tai
patent: 5812102 (1998-09-01), Sprole, Jr. et al.
patent: 5831693 (1998-11-01), McCartney, Jr. et al.
patent: 5838290 (1998-11-01), Kuijk
Houser Kirk D.
Nguyen Tai T.
Radack David V.
Union Switch & Signal Inc.
Wu Daniel J.
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