A re-entry illumination light intensity calculation unit is configured to calculate an intensity of re-entry illumination light, among first polarized lights entering a reflective liquid crystal display element in illumination light including first and second polarized lights, is reflected without being modulated by the reflective liquid crystal display element and returns to a light source unit side, is reflected and re-enters the reflective liquid crystal display element, and calculates a summed value obtained by summing the intensity of the re-entry illumination light of all pixels constituting a frame. A reference re-entry illumination light intensity storage unit stores a reference summed value of reference frame images. A light source control unit selects a reference summed value corresponding to any one of the reference frame images, compares the calculated summed value with the selected reference summed value, and controls a light emission amount from the light source unit.