DISPLAY DEVICE, LUMINANCE CONTROL METHOD, PROGRAM AND COMPUTER READABLE RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To perform optimal display luminance control taking into account a change in visual function with respect to the age of an observer, a difference of preference between observers and a viewing condition.SOLUTION: A luminance control section 6 in a display device 100 comprises an average luminance level computing part 21, a preset value accepting part 22, a maximum display luminance computing part 23 and a light source output computing part 24. The average luminance level computing part 21 calculates an average luminance level from a video signal that is a video source of video images displayed on a display screen. The preset value accepting part 22 accepts arbitrary preset values corresponding to plurality of luminance control levels obtained by dividing values into a plurality of levels between first maximum display luminance and second maximum display luminance as a lower limit and as an upper limit. The maximum display luminance computing part 23 determines the maximum display luminance of the display screen from screen illuminance, the average luminance level and the preset values. Based on the maximum display luminance determined by the maximum display luminance computing part 23, the light source output computing part 24 determines an output value to be given to a light source 3 in such a manner that the maximum display luminance of the display screen becomes the maximum display luminance determined by the maximum display luminance computing part 23.