Dot matrix display device

Details Dot matrix display device Dot matrix display device

2006-01-10

2006-01-10

Nguyen, Jimmy H. (Department: 2673)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S082000, C345S084000

Reexamination Certificate

active

06985124

ABSTRACT:
To improve the display quality in the scanning of a dynamic drive system by effectively preventing the erroneous display of the display elements that are connected to the scanning electrodes during non-selection. The erroneous lighting cancel circuit20has a number of (or assemblies of) dummy diodes MD used for erroneous lighting prevention that is equal to the number of common lines CL, and along with the anode of each dummy diode MD0, MD1, MD2, MD3being electrically connected to each corresponding common line CLO, CL1, CL2, CL3by means of suitable wiring, the cathode of each dummy diode MD0, MD1, MD2, MD3is electrically connected to a terminal of a reference potential (for example, ground potential) through the medium of a shared switch22and a constant current source circuit (active load)24. The control signal SG reaches an active state (H level) only for a prescribed time during the scanning drive period for each horizontal scanning period, and the switch22is placed in the ON state. During this prescribed time, the positive charge that is present on each common line CLO, CL1, CL2, CL3is discharged at a constant current to the ground side through the medium of each dummy diode MD0, MD1, MD2, MD3, the ON state of the switch22, and the constant current source circuit24.

REFERENCES:
patent: 3696393 (1972-10-01), McDonald
patent: 5719589 (1998-02-01), Norman et al.
patent: 11-161219 (1999-06-01), None

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