Abstract: A display controller is provided for controlling a display device, such as a liquid crystal device, to provide pixel overdrive for improving pixel response time. The controller comprises a threshold detector (2) which sets a flag having fewer bits than each pixel value indicating whether a pixel is in a predetermined range for which overdrive is required. The flags are delayed by a frame period in a suitable storage device (6) which does not store the display pixel data. The flags from the display device (6) are supplied to an overdrive selector (3) together with the current pixel data. When the flag is set, the overdrive selector (3) provides overdrive for the current pixel whereas, when the flag is unset, the current pixel value is used without overdrive.

Abstract: A display controller is provided for controlling a display device, such as a liquid crystal device, to provide pixel overdrive for improving pixel response time. The controller comprises a threshold detector (2) which sets a flag having fewer bits than each pixel value indicating whether a pixel is in a predetermined range for which overdrive is required. The flags are delayed by a frame period in a suitable storage device (6) which does not store the display pixel data. The flags from the display device (6) are supplied to an overdrive selector (3) together with the current pixel data. When the flag is set, the overdrive selector (3) provides overdrive for the current pixel whereas, when the flag is unset, the current pixel value is used without overdrive.