Display device and display device drive method

A method for driving a display device that includes an image display panel, a light source, and a controller, the method comprising:

• displaying an image on the basis of an image signal by the image display panel;
• emitting, by the light source, light to the image display panel section by a dimming control according to a control signal that determines a light emission luminance of the light source;
• and
• updating, by the controller, the control signal on a frame-by-frame basis using the image signal and a determination of a mode of change in the light emission luminance, the mode of change being a dynamic image mode or a static image mode, the dynamic image mode having a first rate of change of control signal updates that is lower than a second rate of change of control signal updates for the static image mode,
• wherein the control signal is updated to provide an updated control signal value for a frame of the image signal by determining a calculated control signal value for the frame from the image signal and adjusting the control signal based upon the calculated control signal value and one of the first rate of change or the second rate of change depending upon the determination of the mode of change, such that the updated control signal value approaches a difference in the calculated control signal value more slowly in the dynamic image mode than for the static image mode, and
• wherein the controller generates on the basis of the image signal a conversion coefficient corresponding to each pixel which has a limit value for conversion of luminance of said each pixel on the basis of a hue for said each pixel and by which the luminance of said each pixel is converted, raises a ratio of conversion coefficients by which the luminance is converted over the limit value to all conversion coefficients when a result of the determination of the mode of change is the dynamic image mode, and lowers the ratio when the result is the static image mode.