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