Method for driving capacitive display device
AssigneeSharp Kabushiki Kaisha
InventorEiji Nakamura
Life of this patent
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Abstract
When charging at a voltage with a polarity different from that of a voltage charged in the capacitive display element, by turning the switch ON, after carrying out a charging/discharging to modulate the both electrodes of the capacitive display element to the ground potential, the same is charged at a voltage with another polarity. As compared with the case where the charging/discharging between the positive power supply voltage+VM and the negative power supply voltage −VM is made directly, the electric power consumption can be reduced to ½ when the same is once modulated to the ground potential 0V. The electric power consumption can be further reduced by modulating the intermediate potential in a plurality of steps.
Claims9
A method for driving a capacitive display apparatus having a plurality of display pixels comprised of capacitive elements which are disposed respectively at crossing portions between data-side electrodes and scan-side electrodes, the method comprising the steps of:
- driving the data-side electrodes at a voltage corresponding to display data, while scanning the scan-side electrodes to be selected sequentially;
- applying a driving voltage to the display pixels to carry out a display operation;
- and
- when the data-side electrodes are driven to be charged with a voltage having an inverse polarity relative to a voltage charged at a previous charge, charging/discharging the data-side electrodes once to an intermediate potential level of which absolute value is smaller than the voltage applied for display operation between the charging voltages before and after driving the same.
Dependencies are inferred from the claim text.