This invention is a driving method of a liquid crystal display panel in which a liquid crystal layer is sealed between a transparent first substrate formed with a plurality of scanning electrodes and a transparent second substrate formed with a plurality of data electrodes, the electrodes being formed on respective inner faces opposing each other, and portions where the scanning electrodes and data electrodes oppose each other with the liquid crystal layer sandwiched therebetween constitute pixel portions respectively, and which performs display by an electrooptical change having a memory property in the liquid crystal layer at each pixel portion, in which selection signals are applied to the plurality of scanning electrodes and a data signal is applied to the data electrode in correspondence with the selection signal of each scanning electrode to control the individual pixel portion independently, and a plurality of selection signals having different selection periods each for selecting one scanning electrode are selectively applied as the selection signals.

 
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> Method and device for optical navigation

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