Patent ID: 8890797

Claim:
A display device comprising: an illuminance sensor that detects an illuminance in a surrounding environment; an input average luminance detection circuit that detects an average luminance of input images; a frame insertion control circuit that produces a gray image frame and inserts the produced gray image frame into between an input image frame and its subsequently input image frame; and an insertion luminance level generation circuit that determines a luminance of the gray image frame according to the illuminance detected by the illuminance sensor and the average luminance of the input images detected by the input average luminance detection circuit, wherein the insertion luminance level generation circuit is configured such that when the illuminance detected by the illuminance sensor is contained in a first range of less than a first set value, the luminance of the gray image frame is set to a lower luminance than the average luminance of the input images, that when the illuminance detected by the illuminance sensor is contained in a second range of not less than the first set value and less than a second set value, the luminance of the gray image frame is set to be equal to the average luminance of the input images, and that when the illuminance detected by the illuminance sensor is contained in a third range of not less than the second set value, the luminance of the gray image frame is set to a luminance of not lower than the average luminance of the input images; and when the illuminance detected by the illuminance sensor is contained in the first range or the third range, the luminance of the gray image frame is determined such that a value obtained by dividing the luminance of the gray image frame by the average luminance of the input images increases as the illuminance detected by the illuminance sensor increases.