Driving method for thin film el display device and driving circu

Details Driving method for thin film el display device and driving circu Driving method for thin film el display device and driving circu

1988-07-06

1990-08-21

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340793, 340781, G09G 320

Patent

active

049510410

ABSTRACT:
A driving method is described for thin film EL display devices having an EL layer interposed between scanning side electrodes and data side electrodes which are intersected to each other. The method comprises displaying frames formed by a line sequential drive in which voltage corresponding to display data is applied to the data side electrodes. Concurrently, write pulses which are negative and positive with respect to the data side electrodes are applied to the scanning side electrodes. Further the write pulses which are positive or negative with respect to the data side electrodes are applied to the scanning electrodes. The number of light emitting picture elements of the scanning side electrodes is previously detected from display data and the width of the write pulses, which are at least one of positive or negative is controlled in proportion to the number of the light emitting picture elements. Thus, the brightness of the light emitting picture elements is uniform due to the driving circuit thereof.

REFERENCES:
patent: 4087792 (1978-05-01), Asars
patent: 4554539 (1985-11-01), Graves
patent: 4686426 (1987-08-01), Fujioka et al.

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