Thin film el display panel drive circuit

Details Thin film el display panel drive circuit Thin film el display panel drive circuit

1989-06-26

1990-10-09

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

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

3151692, 3151693, G09G 312

Patent

active

049623745

ABSTRACT:
A thin film electroluminescent (EL) display panel drive circuit includes first and second switching circuits for driving scanning electrodes of the panel in two fields, wherein odd numbered scanning electrodes are applied with a negative voltage polarity and even numbered scanning electrodes are provided with a positive voltage polarity in a first field, and the voltage polarities are reversed during the second field. Data signals are applied to data electrodes by a data electrode driver circuit which includes third and fourth switching circuits for providing selected data electrodes with a modulate voltage of a stepwise nature or ground, depending upon whether the selected data electrodes intersect with selected scanning electrodes having a negative or positive voltage polarity respectively. The stepwise modulation voltage is supplied by a control switching circuit which selectively supplies the third switching circuit with voltages of a first level, a second level and a floating level.

REFERENCES:
patent: 4456909 (1984-06-01), Takahara et al.
patent: 4488150 (1984-12-01), Kanatani
patent: 4594589 (1986-06-01), Ohba et al.
patent: 4636789 (1987-01-01), Yamaguchi et al.
patent: 4652872 (1987-03-01), Fujita

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