Sharp Kabushiki Kaisha Corporation

Sharp Kabushiki Kaishi

Tetsuo Murata

Tomohiro Kimura

Naru Usukura

A display device includes: a foldable display panel having flexibility; a touch detector disposed selectively on one panel face side of the display panel and capable of detecting a plurality of touch areas; and a determiner for detecting that the display panel is folded only if the touch areas detected by the touch detector are three or more in number, and a largest first touch area thereof is located between the touch areas other than the first touch area.

Display device with detection of fold by number and size of touch areas

In order to improve the contrast of a liquid crystal display device by the voltage equalization method, scanning side electrodes totaling D in number are scanned in line sequential fashion while applying a voltage between each selected scanning side electrode and each signal side electrode, the voltage applied being controlled in such a way that, during a total of D times of scanning of the scanning side electrodes for production of one frame, when a particular scanning side electrode and a particular signal side electrode are simultaneously in a select state, a voltage Vop is applied to the corresponding liquid crystal, and when the scanning side electrodes respectively are in a non-select state, which occurs the remaining (D-1) times for each of the scanning side electrodes, a voltage whose polarity is reversed in response to the select and non-select states of the signal side electrodes and whose absolute value is represented by .vertline.Vop/B.vertline., where B is the bias ratio, is applied to the corresponding liquid crystal. The bias ratio B can be varied to adjust the contrast of the liquid crystal display device, and it is possible to improve the contrast by increasing the bias ratio.

Liquid crystal display apparatus

A method of driving a liquid crystal display device by a voltage averaging method comprises the step of operating this device at a bias ratio which is larger than the theoretically optimum bias ratio for the device so that unevenness in contrast is reduced.

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Sakai, Japan

Tetsuo Murata