Patent ID: 8487966

Claim:
A display apparatus, comprising: a display device that employs cholesteric liquid crystal; a driver circuit that passively drives a plurality of pixels in the display device; and a control circuit that controls the driver circuit, wherein the control circuit applies (1) an initialization pulse to reset a plurality of pixels to a planar state, (2) a tone pulse to obtain a state of intermediate tone in which the planar state and a focal-conic state coexist and display the tone, and wherein the tone pulse includes (a) an all-selected voltage pulse to be applied to a plurality of pixels the tone state of which are changed, and (b) a half-selected voltage pulse and a non-selected voltage pulse to be applied to a plurality of pixels the tone state of which are not changed, and wherein a ratio of a voltage of the all-selected voltage pulse to a voltage of the half-selected voltage pulse is larger than 2 1/2 and smaller than 2.