Patent ID: 8462085

Claim:
A display device including a display unit having luminescence elements that individually becomes luminous depending on a current amount, the luminescence elements arranged in a matrix pattern, the display device comprising: an adjustment signal generator for generating an adjustment signal for adjusting an effective duty regulating, per unit time, a luminous time for which the luminescence elements are luminous; a luminous time setter for setting the effective duty equal to or lower than an upper limit value provided for the effective duty to be set, according to picture information of an input picture signal, so that a total luminescence amount per unit time is limited, at which amount the luminescence elements of the display unit are luminous; an upper limit value setter for changing the upper limit value of the luminous time setter, depending on the adjustment signal output from the adjustment signal generator based on an operation; and an average luminance calculator for calculating average luminance for a predetermined period of the input picture signal, wherein the luminous time setter sets the effective duty depending on the average luminance calculated by the average luminance calculator, and the average luminance calculator includes: a current ratio adjuster for multiplying primary colour signals of the picture signal respectively by adjustment values for the respective primary colour signals based on voltage-current characteristics, and an average value calculator for calculating the average luminance for the predetermined period of the picture signals output from the current ratio adjuster.