Sharp Kabushiki Kaisha Corporation

Kazuo Shoji

Toshihiro Ohba

Shigeyuki Harada

Hisashi Yamaguchi

Hisashi Uede

Hiroshi Kishishita

Akio Inohara

Atsushi Sakamoto

Yoshihide Fujioka

Yosihide Fujioka

Hisashi Ueda

Kioichi Yamamoto

A method of driving a display device with a plurality of scanning side electrodes and a plurality of data side electrodes which are disposed in directions intersecting each other, and a dielectric layer interposed between the scanning side electrodes and the data side electrodes, and including steps of applying modulation voltages corresponding to display data to the data side electrodes, and also applying writing voltages of positive or negative polarity to the scanning side electrodes through line sequence, so as to cause picture elements composed of the dielectric layer to emit light. The driving method further includes steps of thinning out the display data, and applying a plurality of kinds of modulation voltages different in amplitude according to each frame, so as to cause the picture elements to effect gradation display of different brightness in multi-stages.

Method of driving a display device

A thin film EL display device is described which comprises a group of parallel scanning electrodes, a group of parallel data electrodes laid so as to extend perpendicular to the group of the scanning electrodes, and an EL layer disposed between the respective groups of the scanning and data electrodes. Each of the electrodes of at least one of the groups of the scanning and data electrodes which apply a writing voltage to the EL layer is connected with a driver circuit of high voltage breakdown characteristic having only a push-pull function or a pull-up and pull-down function. This driver circuit employs thyristors as switching elements.

Thin film el display device

The present invention relates to a driving circuit of a thin film electroluminescent (EL) display, wherein a high withstand-voltage driver IC composed of a bi-directional switching element having push/pull function is connected with one or both of the scanning electrodes and the data electrodes of EL display, the bi-directional switching circuit for applying the writing voltage or the modulation voltage is applied with the pull up common line of each of the drivers IC and the pull down common line, a switch for extremely recovering, after the thin film EL element has emitted its light, the electric charge accumulated on the thin film EL display element, and a capacitor for accumulating the drawn out electric charge are disposed in the bi-directional switching circuit, and the modulation accumulation electric charge accumulated on the film EL display element after the light emission is accumulated on the capacitor, so that the modulation consumption power occupying the majority of the driving power without the damages to the conventional advantages may be reduced by 25% as compared with the conventional driving.

Driving circuit of thin membrane EL display apparatus

A thin film EL display device wherein an EL layer is interposed between scanning side electrodes and data side electrodes which are arranged to cross one another. A data side driver IC, including switching elements for charging and discharging, is connected to the data side electrodes, and switching circuits for applying modulation voltage are connected to a pull-up common line of the data side driver IC. The switching circuits are provided with switches for removing the charge stored in the thin film EL device after the thin film EL device has emitted light and a capacitor for storing the removed charge, whereby the charge stored in the capacitor can be reused in the next light emission for the purpose of reducing power consumption.

Driving circuit for thin film EL display device

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Nara, Japan

Kazuo Shoji