Display device and driving method thereof
In the first signal writing period which is a portion of one horizontal scan period, a first pixel signal is input to the first signal line. The first pixel signal is input from the first signal line to a first pixel circuit throughout a first signal converging period which is longer than the first signal writing period. A second pixel signal is input to the second signal line in a second signal writing period which is another portion of the one horizontal scan period. The second pixel signal is input from the second signal line to a second pixel circuit throughout a second signal converging period which is longer than the second signal writing period. After the first signal converging period and the second signal converging period, electric currents are supplied to the light emitting elements of the first pixel circuit and of the second pixel circuit.
1. A driving method of a display device, the display device comprising:
a plurality of pixels including a first pixel and a second pixel;
a first pixel circuit provided to the first pixel, and including a light emitting element and a first drive transistor connected to the light emitting element;
a second pixel circuit provided to the second pixel, and including a light emitting element and a second drive transistor connected to the light emitting element; and
a plurality of signal lines including a first signal line connected to the first pixel circuit and a second signal line connected to the second pixel circuit,
the driving method comprising steps of:
inputting a first pixel signal into the first signal line in a first signal writing period that is a partial period in one horizontal scan period to thereby store the first pixel signal in the first signal line;
inputting the first pixel signal to the first pixel circuit from the first signal line throughout a first signal converging period that includes at least a portion of the first signal writing period and is longer than the first signal writing period;
inputting a second pixel signal into the second signal line in a second signal writing period that is another partial period in the one horizontal scan period to thereby store the second pixel signal in the second signal line;
inputting the second pixel signal to the second pixel circuit from the second signal line throughout a second signal converging period that includes at least a portion of the second signal writing period and is longer than the second signal writing period; and
turning the first drive transistor and the second drive transistor to an on-state after the first signal converging period and the second signal converging period to thereby supply electric current to the light emitting elements of the first pixel circuit and the second pixel circuit, wherein
the one horizontal scan period has n signal writing periods defined therein,
the n signal writing periods including the first signal writing period and the second signal writing period and not overlapping with each other, and
each of the first signal converging period and the second signal converging period has n times the length of the signal writing period or is shorter than n times the length of the signal writing period.
2. The driving method according to claim 1 , wherein
the display device further comprises a drive integrated circuit that includes an output terminal connectable to the first signal line and the second signal line, and
the driving method further comprises steps of connecting the output terminal and the first signal line in the first signal writing period, and connecting the output terminal and the second signal line in the second signal writing period.
3. The driving method according to claim 1 , wherein
the first signal converging period has a start synchronized with a start of the first signal writing period, and
the second signal converging period has a start synchronized with a start of the second signal writing period.
4. The driving method according to claim 1 , wherein the first signal converging period includes a partial period overlapping with the second signal converging period.
5. The driving method according to claim 1 , wherein
a voltage of a signal storing capacitor connected to a gate of the first drive transistor of the first pixel circuit converges in the first signal converging period to a voltage shifted by a threshold voltage of the drive transistor of the first pixel circuit from a voltage corresponding to the first pixel signal, and
a voltage of a signal storing capacitor connected to a gate of the second drive transistor of the second pixel circuit converges in the second signal converging period to a voltage shifted by a threshold voltage of the drive transistor of the second pixel circuit from a voltage corresponding to the second pixel signal.
6. The driving method according to claim 1 , wherein
the plurality of pixels further include a third pixel,
the third pixel includes a light emitting element and a third pixel circuit including a third drive transistor connected to the light emitting element,
the driving method comprises steps of inputting a third pixel signal into a third signal line in a third signal writing period that is a partial period in the one horizontal scan period to thereby store the third pixel signal in the third signal line, and
inputting the third pixel signal to the third pixel circuit from the third signal line throughout a third signal converging period that includes at least a portion of the third signal writing period and is longer than the third signal writing period.
7. A driving method of a display device, the display device comprising:
a plurality of pixels including a first pixel and a second pixel;
a first pixel circuit provided to the first pixel, and including a light emitting element and a first drive transistor connected to the light emitting element;
a second pixel circuit provided to the second pixel, and including a light emitting element and a second drive transistor connected to the light emitting element; and
a plurality of signal lines including a first signal line connected to the first pixel circuit and a second signal line connected to the second pixel circuit,
the driving method comprising steps of:
inputting a first pixel signal into the first signal line in a first signal writing period that is a partial period in one horizontal scan period to thereby store the first pixel signal in the first signal line;
inputting the first pixel signal to the first pixel circuit from the first signal line throughout a first signal converging period that includes at least a portion of the first signal writing period and is longer than the first signal writing period;
inputting a second pixel signal into the second signal line in a second signal writing period that is another partial period in the one horizontal scan period to thereby store the second pixel signal in the second signal line;
inputting the second pixel signal to the second pixel circuit from the second signal line throughout a second signal converging period that includes at least a portion of the second signal writing period and is longer than the second signal writing period; and
turning the first drive transistor and the second drive transistor to an on-state after the first signal converging period and the second signal converging period to thereby supply electric current to the light emitting elements of the first pixel circuit and the second pixel circuit, wherein
the first signal converging period includes a partial period overlapping with the second signal converging period.
8. The driving method according to claim 7 , wherein
the display device further comprises a driver circuit that includes an output terminal connectable to the first signal line and the second signal line, and
the driving method further comprises steps of connecting the output terminal and the first signal line in the first signal writing period, and connecting the output terminal and the second signal line in the second signal writing period.
9. The driving method according to claim 7 , wherein
the first signal converging period has a start synchronized with a start of the first signal writing period, and
the second signal converging period has a start synchronized with a start of the second signal writing period.
10. The driving method according to claim 7 , wherein
a voltage of a signal storing capacitor connected to a gate of the first drive transistor of the first pixel circuit converges in the first signal converging period to a voltage shifted by a threshold voltage of the drive transistor of the first pixel circuit from a voltage corresponding to the first pixel signal, and
a voltage of a signal storing capacitor connected to a gate of the second drive transistor of the second pixel circuit converges in the second signal converging period to a voltage shifted by a threshold voltage of the drive transistor of the second pixel circuit from a voltage corresponding to the second pixel signal.
11. The driving method according to claim 7 , wherein
the plurality of pixels further include a third pixel,
the third pixel includes a light emitting element and a third pixel circuit including a third drive transistor connected to the light emitting element,
the drive method comprises the steps of inputting a third pixel signal into a third signal line in a third signal writing period that is a partial period in the one horizontal scan period to thereby store the third pixel signal in the third signal line, and
inputting the third pixel signal to the third pixel circuit from the third signal line throughout a third signal converging period that includes at least a portion of the third signal writing period and is longer than the third signal writing period.