Patent ID: 8896590

Claim:
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, and (iv) a scanning signal line driving circuit for driving the scanning signal lines by outputting scanning signals thereto, the display controller comprising: a gate slope period determining section that, determines a gate slope period out of one horizontal period in the display device and maintains the determined gate slope period even if a frame rate in the display device is changed, the gate slope period being a period during which a voltage level outputted from the scanning signal line driving circuit is decreased, wherein the gate slope period determining section includes a timer circuit to determine the gate slope period based on a 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.