Active matrix type display apparatus
View Patent ↗A plurality of display pixels PX arranged in a matrix form respectively have a driving transistor which controls an electric current amount made to flow in a self-luminescent element, in accordance with an image signal, a first switch formed of a transistor and connected between a gate and a drain of the driving transistor, and a second switch formed of a transistor and connected between the driving transistor and the self-luminescent element. A first capacitance Cs is provided between the gate and a source of the driving transistor, and a second capacitance Cx is provided between the second switch and the gate of the driving transistor.
1. An active matrix type display apparatus comprising:
a self-luminescent element which is connected to a first voltage power source line and which emits light in accordance with a supplied electric current;
a driving transistor which is connected between a second voltage power source line and the self-luminescent element and which controls an electric current amount supplied to the self-luminescent element in accordance with a gate control voltage;
a first switch formed of a transistor and connected between a gate and a drain of the driving transistor;
a first capacitance connected to the gate;
a second switch formed of a transistor and connected between the drain of the driving transistor and the self-luminescent element; and
a second capacitance connected between the second switch and the gate of the driving transistor.
2. An active matrix type display apparatus according to claim 1 , wherein the second capacitance has a capacitance value in which a sum of an amount of displacement in the gate control voltage generated when the first switch is turned off and an amount of displacement in the gate control voltage generated when the second switch is turned on is made to be substantially zero.
3. An active matrix type display apparatus according to claim 1 , wherein the driving transistor, the first switch, and the second switch are respectively formed of thin-film transistors having semiconductor layers made of polysilicon.
4. An active matrix type display apparatus according to claim 1 , wherein the first switch and the second switch are respectively formed of thin-film transistors having the same conductivity, a drain of the second switch is connected to the self-luminescent element, a source of the second switch is connected to the drain of the driving transistor, and the second capacitance is connected between the source of the second switch and the gate of the driving transistor.
5. An active matrix type display apparatus according to claim 1 , wherein the second capacitance is formed of a parallel plate capacitance.
6. An active matrix type display apparatus according to claim 1 , wherein the second capacitance is formed of a parallel inter-wiring capacitance.
7. An active matrix type display apparatus according to claim 1 , wherein the supplied electric current is set on the basis of an electric current signal.
8. An active matrix type display apparatus according to claim 1 , wherein the self-luminescent element has a pair of electrodes facing each other, and an organic emitting layer positioned between the electrodes.