the invention provides a ferroelectric liquid crystal display with uniformly spaced greyscale levels . the invention uses a bistable ferroelectric liquid crystal display formed by a layer of chiral smectic liquid crystal material between two cell walls . the walls carry e . g . line and column electrodes to give an x , y matrix of addressable pixels , and are surface treated to provide bistable operation . each pixel may be divided into subpixels thereby giving spatial weighting for greyscale . temporal weighting of greyscale is obtained by switching a pixel to a dark state for time t1 and a light state for time t2 . when t1 and t2 are not equal , four different greyscales are obtainable ; i . e . dark , dark grey , light grey , and light . the present invention provides a required uniform spacing of greyscale levels by addressing each pixel two or more times in one frame time . each pixel is blanked then strobed , two or more times in each frame time ; the relative times between blanking and strobing , at least four different time periods , are varied to give the desired greyscale levels . the temporal and spatial weighting may be combined to increase the number of obtainable greyscales . further , the relative intensity between adjacent subpixels may be adjusted to vary the apparent size of the smallest subpixel ; this is useful when subpixel size is near to manufacturing limits .