1. An image processing circuit comprising: a quantization unit to quantize image data input to a liquid crystal display with a predetermined threshold value and output the quantized data; a threshold-value proximity determination unit to determine whether or not said input image data is proximal to said predetermined threshold value and output threshold-value proximity determination data; a moving-image/static-image determination unit to determine whether or not said input image data of a current frame is a static image or a moving image, on the basis of said quantized data and said threshold-value proximity determination data of the current frame and said quantized data and said threshold-value proximity determination data of a previous frame; and an overdrive processing unit to output overdrive image data which has been subjected to overdrive processing if said moving-image/static-image determination unit determines that said input image data is a moving image.