Patent ID: 7679593

Claim:
A display device comprising: a liquid crystal display comprising a plurality of scanning lines, a plurality of data lines which cross the scanning lines, and chiral nematic liquid crystal provided between the scanning lines and the data lines, the scanning lines and the data lines defining a plurality of pixels arranged in a matrix, the liquid crystal being capable of displaying an image thereon continuously while no voltages are applied to the scanning lines and the data lines, and the liquid crystal performing selective reflection in a cholestric phase; a driver which is connected to the scanning lines and the data lines and which carries out writing in a first display area of the liquid crystal display and writing in a second display area of the liquid crystal display independently of each other in a predetermined display mode, wherein the first display area and the second display area are separated by a specified scanning line as a border, and in said predetermined display mode, the driver carries out writing by interlace scanning repeatedly in a plurality of fields into which each frame is divided, wherein said specified scanning line is changeable, and wherein said driver drives the liquid crystal display with a driving waveform including a reset step of resetting the liquid crystal into a homeotropic state, a selection step of selecting a final state of the liquid crystal, and an evolution step of establishing the final state of the liquid crystal; an operation member to be used by an operator; and a controller for controlling the driver to start an interlace scanning drive in response to operation of the operation member, wherein the liquid crystal keeps displaying an image thereon using a memory effect until interlace scanning is started, and wherein, in an area other than an area that is subjected to interlace scanning, the liquid crystal keeps displaying an image thereon using the memory effect.