Pulse-type driving device

Details Pulse-type driving device Pulse-type driving device

1994-11-16

1997-02-18

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display peripheral interface input device

Cursor mark position control device

345164, 345166, G09G 508

Patent

active

056045158

ABSTRACT:
A pulse-type driving device for driving a plurality of light emitting diodes includes a power source providing a DC voltage, a pointer control circuit including a pulse output terminal for outputting pulses therefrom. A plurality of sets of detecting circuits each of which includes one of the light emitting diodes, a phototransistor, and a transistor. The light emitting diode emits light to activate the phototransistor which in turn triggers the transistor to output a signal to the pointer control circuit. A constant current source is connected between the pointer control circuit and the light emitting diodes and provides constant current to energize the light emitting diodes.

REFERENCES:
patent: 4886941 (1989-12-01), Davis
patent: 4959805 (1990-09-01), Onouchi et al.
patent: 5027109 (1991-06-01), Donovan et al.
patent: 5153571 (1992-10-01), Takahashi
patent: 5298918 (1994-03-01), Yen-Chen et al.
patent: 5521617 (1996-05-01), Imai et al.

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