1. A display device, comprising: an array of pixels; and an array of processing elements, each associated with a respective pixel or group of pixels; wherein each processing element comprises: an input for receiving input display data relating to a plurality of the pixels; a processor for processing received input display data to determine individual pixel data for the pixel or for each of the group of pixels associated with the processing element; and a pixel driver for driving the associated pixel or each pixel of the associated group of pixels with that pixel's determined individual pixel data.