A liquid crystal display device includes a pair of substrates, a plurality
of pixels arranged in a matrix and a static memory formed on the
substrates. A bit signal corresponding to an image data is written and
held in a static memory in the pixel. The polarity of the input bit
signal is controlled. A liquid crystal voltage supplied to a liquid
crystal layer arranged between the pair of substrates is generated by the
bit signal. The polarity of the bit signal is controlled to alternate the
liquid crystal voltage, and a transmittance of the liquid crystal layer
is changed by supplying the alternated liquid crystal voltage.