A holographic projector comprising: a light source; and a display device; the display device comprising: a liquid crystal display panel comprising a plurality of pixels; a display engine arranged to drive each pixel of the plurality of pixels, in accordance with a drive signal, during each display event of a respective display interval of a plurality of display intervals defined by the display engine; a hologram engine arranged to send a sequence of multi-level phase holograms for display to the display engine; and wherein the display engine is arranged to display each multi-level phase hologram of the sequence in a respective display interval, wherein the display intervals used to display the respective multi-level phase holograms of the sequence are immediately consecutive; and wherein the light source is arranged to illuminate each hologram during the corresponding display interval, such that a holographic reconstruction of a target image corresponding to each respective hologram is formed on a replay plane spatially separated from the display device; wherein each successive multi-level phase hologram of the sequence corresponds to a different respective target image comprising different image content, such that each successive multi-level phase hologram of the sequence leads to a corresponding holographic reconstruction of a different respective target image being formed on the replay plane; and wherein the display engine is arranged to invert the polarity of the drive signal every n display intervals, wherein n is an integer, such that each holographic reconstruction of a different respective target image is formed during a respective display interval, without the polarity of the drive signal changing during said respective display interval. a light source; and a display device; the display device comprising: a liquid crystal display panel comprising a plurality of pixels; a display engine arranged to drive each pixel of the plurality of pixels, in accordance with a drive signal, during each display event of a respective display interval of a plurality of display intervals defined by the display engine; a hologram engine arranged to send a sequence of multi-level phase holograms for display to the display engine; and wherein the display engine is arranged to display each multi-level phase hologram of the sequence in a respective display interval, wherein the display intervals used to display the respective multi-level phase holograms of the sequence are immediately consecutive; and wherein the light source is arranged to illuminate each hologram during the corresponding display interval, such that a holographic reconstruction of a target image corresponding to each respective hologram is formed on a replay plane spatially separated from the display device; wherein each successive multi-level phase hologram of the sequence corresponds to a different respective target image comprising different image content, such that each successive multi-level phase hologram of the sequence leads to a corresponding holographic reconstruction of a different respective target image being formed on the replay plane; and wherein the display engine is arranged to invert the polarity of the drive signal every n display intervals, wherein n is an integer, such that each holographic reconstruction of a different respective target image is formed during a respective display interval, without the polarity of the drive signal changing during said respective display interval. a liquid crystal display panel comprising a plurality of pixels; a display engine arranged to drive each pixel of the plurality of pixels, in accordance with a drive signal, during each display event of a respective display interval of a plurality of display intervals defined by the display engine; a hologram engine arranged to send a sequence of multi-level phase holograms for display to the display engine; and wherein the display engine is arranged to display each multi-level phase hologram of the sequence in a respective display interval, wherein the display intervals used to display the respective multi-level phase holograms of the sequence are immediately consecutive; and wherein the light source is arranged to illuminate each hologram during the corresponding display interval, such that a holographic reconstruction of a target image corresponding to each respective hologram is formed on a replay plane spatially separated from the display device; wherein each successive multi-level phase hologram of the sequence corresponds to a different respective target image comprising different image content, such that each successive multi-level phase hologram of the sequence leads to a corresponding holographic reconstruction of a different respective target image being formed on the replay plane; and wherein the display engine is arranged to invert the polarity of the drive signal every n display intervals, wherein n is an integer, such that each holographic reconstruction of a different respective target image is formed during a respective display interval, without the polarity of the drive signal changing during said respective display interval.