1. A method of driving a bistable electro-optic display having a plurality of pixels each of which is capable of displaying at least three optical states, including two extreme optical states, the method comprising: driving the electro-optic display using a first drive scheme capable of effecting transitions between all of the gray levels which can be displayed by the pixels; and driving the electro-optic display using a second drive scheme which contains only transitions ending at one of the extreme optical states of the pixels.