Display controller, display device, and control method for controlling display system and display device

A display controller for controlling a display device including (i) a plurality of pixels, (ii) picture signal lines for supplying data signals to the pixels, (iii) scanning signal lines intersecting the picture signal lines, respectively, (iv) switching elements provided on intersections of the picture signal lines and the scanning signal lines, and (v) a scanning signal line driving circuit for driving the scanning signal lines by outputting scanning signals thereto, the display controller comprising:

• a stable pixel writing period determining section that determines a stable pixel period out of one horizontal period, and maintains the determined stable pixel writing period even if a frame rate in the display device is changed, the stable pixel writing period being a period during which a voltage level outputted from the scanning signal line driving circuit is high;
• and
• a gate slope period determining section that determines a gate slope period out of the one horizontal period, so that the gate slope period starts at timing when the stable pixel writing period ends, and maintains the thus determined gate slope period even if the frame rate is changed, the gate slope period being a period during which the voltage level outputted from the scanning signal line driving circuit is decreased, wherein
• the stable pixel writing period determining section includes a first timer circuit to determine the stable pixel writing period based on a first reference signal independent from the frame rate,
• the gate slope period determining section includes a second timer circuit to determine the gate slope period based on a second reference signal independent from the frame rate, and
• the scanning signal line driving circuit includes,
• a first switch having one terminal via which a direct voltage is applied to the first switch,
• a capacitor component and a resistor component which are connected with the other terminal of the first switch,
• a second switch for causing the capacitor component to carry out an electric discharge via the resistor component while the second switch is being closed, and
• an inverter for opening and closing the first switch or the second switch based on the reference signal.