Light emitting indicator drive circuit

Details Light emitting indicator drive circuit Light emitting indicator drive circuit

2005-08-16

2005-08-16

Tran, Henry N. (Department: 2674)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S204000

Reexamination Certificate

active

06930659

ABSTRACT:
In a light emitting indicator drive circuit which supplies a current to display elements different in display areas, a constant-current is supplied from a P-channel MOS-FET to a display element and a pulse width control circuit controls a on/off ratio. deterioration information from a deterioration detecting circuit and saved segment area information is calculated, and its result decides a time to supply a current to the display elements as a result of the arithmetic operation. With the above operation, a difference in luminance between the display elements and the degradation of luminance caused by the deterioration can be corrected.

REFERENCES:
patent: 4222644 (1980-09-01), Tano et al.
patent: 4479121 (1984-10-01), Tabata
patent: 47-041325 (1972-12-01), None
patent: 58-190986 (1983-11-01), None
patent: 09-305146 (1997-11-01), None
patent: 10-254410 (1998-09-01), None

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