Patent ID: 8749454

Claim:
An image display device, comprising: a luminescence element that has a first electrode and a second electrode; a capacitor that has a first electrode and a second electrode, and holds a capacitor voltage; a driver that has a drain electrode, a gate electrode connected to the first electrode of the capacitor, and a source electrode connected to the first electrode of the luminescence element, and causes the luminescence element to emit light by applying a drain current corresponding to the capacitor voltage held by the capacitor to the luminescence element; a first power source line for determining a potential of the drain electrode of the driver; a second power source line electrically connected to the second electrode of the luminescence element; a third power source line for supplying a reference voltage to the first electrode of the capacitor; a data line for supplying a signal voltage to the second electrode of the capacitor; a first switch between the third power source line and the first electrode of the capacitor for supplying the reference voltage to the first electrode of the capacitor; a second switch between the data line and the second electrode of the capacitor for supplying the signal voltage to the second electrode of the capacitor; a third switch between the source electrode of the driver and the second electrode of the capacitor for connecting the source electrode of the driver and the second electrode of the capacitor; and a controller for controlling the first switch, the second switch, and the third switch, wherein the controller: switches OFF the third switch at a first timing to disconnect the source electrode of the driver from the second electrode of the capacitor for preventing current from flowing from the source electrode to the second electrode to prevent variation in the capacitor voltage held by the capacitor; switches ON the first switch and the second switch at a second timing after the first timing and when the third switch is switched OFF for causing the capacitor to hold the capacitor voltage corresponding to the signal voltage; and switches OFF the first switch and the second switch at a third timing after the capacitor voltage corresponding to the signal voltage is held by the capacitor; and switches ON the third switch at a fourth timing after the third timing to connect the source electrode of the driver and the second electrode of the capacitor for causing the driver to apply the drain current corresponding to the capacitor voltage to the luminescence element.