Image display device

摘要

An image display device includes: an organic EL element, a first electrostatic capacitor, a driving transistor having a gate connected to a first electrode of the first electrostatic capacitor and a source connected to an anode of the organic EL element, a second electrostatic capacitor having an electrode connected to a second electrode of the first electrostatic capacitor, a negative power source line which determines the potential of a cathode of the organic EL element, and a scanning line driving circuit which controls a first switching transistor, a second switching transistor, and a third switching transistor. In a non-light-emitting period, the scanning line driving circuit sets, during a period from a start of a reset period to an end of the non-light-emitting period, a fixed voltage corresponding to the potential of the negative power source line to the source electrode of the driving transistor.

主权项

1. An image display device comprising:
a light-emitting element; a first capacitor which holds a voltage; a driving transistor having a gate electrode connected to a first electrode of the first capacitor, and a source electrode connected to a first electrode of the light-emitting element, the driving transistor causing the light-emitting element to emit light by applying, to the light-emitting element, a drain current corresponding to the voltage held by the first capacitor; a second capacitor having a first electrode connected to a second electrode of the first capacitor; a first power source line connected to a drain electrode of the driving transistor, for determining a potential of the drain electrode of the driving transistor; a second power source line connected to a second electrode of the light-emitting element, for determining a potential of the second electrode of the light-emitting element; a third power source line connected to the first electrode of the first capacitor, for supplying a first reference voltage defining a voltage value of the first electrode of the first capacitor; a fourth power source line connected to a second electrode of the second capacitor, for supplying a second reference voltage defining a voltage value of the second electrode of the second capacitor; a data line for supplying a signal voltage to the second electrode of the first capacitor; a first switching element provided between the first electrode of the first capacitor and the third power source line, the first switching element setting the first reference voltage to the first electrode of the first capacitor; a second switching element having two terminals one of which is electrically connected to the data line and the other of which is electrically connected to the second electrode of the first capacitor, the second switching element switching between a conducting state and a non-conducting state between the data line and the second electrode of the first capacitor; a third switching element provided between the first electrode of the light-emitting element and the second electrode of the first capacitor, the third switching element switching between a conducting state and a non-conducting state between the first electrode of the light-emitting element and the second electrode of the first capacitor; a driving circuit which controls the first switching element, the second switching element, and the third switching element; a first scanning line connected to the first switching element, the second switching element, and the driving circuit; and a second scanning line connected to the third switching element and the driving circuit, wherein, at a start of a reset period in a non-light-emitting period during which the third switching element is non-conducting, the driving circuit starts (i) setting a data voltage from the data line to the second electrode of the first capacitor, (ii) setting the first reference voltage from the third power source line to the first electrode of the first capacitor and the gate electrode of the driving transistor, and (iii) setting a fixed voltage corresponding to a potential of the second power source line to the source electrode of the driving transistor, the start of the reset period being a time at which the first switching element and the second switching element are made conducting by applying an on-voltage to the first scanning line; in the non-light-emitting period after making the first switching element and the second switching element non-conducting by applying an off-voltage to the first scanning line, the fixed voltage corresponding to the potential of the second power source line is set to the source electrode of the driving transistor; and in a light-emitting period, the driving circuit causes the light-emitting element to emit light, by applying a potential difference between the first electrode and the second electrode of the first capacitor, between the gate electrode and the source electrode of the driving transistor to cause a current to flow between the drain electrode and the source electrode of the driving transistor according to a potential difference between the gate electrode and the source electrode of the driving transistor, the light-emitting period being a period during which the first switching element and the second switching element are non-conducting and the third switching element is conducting made via the second scanning line.