1. An image processing apparatus comprising: a displaying part; a light source generating light; a display driving part displaying an image on the displaying part by controlling an intensity of the light generated by the light source on the basis of one of a plurality of image signals; a light shutting part passing or blocking the light generated by the light source; and a controlling part controlling the light shutting part to block the light generated-by the light source while the image signal which has been displayed on the displaying part is being changed into another one of the plurality of image signals.