A drive circuit having an output terminal includes a buffer circuit including a first transistor and a second transistor that are connected in parallel between a power supply and the output terminal. The first transistor and the second transistor are controlled such that after the first transistor and the second transistor are simultaneously turned on, the second transistor is turned off earlier than the first transistor.
1. A drive circuit having an output terminal, the drive circuit comprising
a buffer circuit that includes a first transistor and a second transistor that are connected in parallel between a power supply and the output terminal,
wherein the first transistor and the second transistor are controlled such that after the first transistor and the second transistor are simultaneously turned on, the second transistor is turned off earlier than the first transistor.
2. The drive circuit according to claim 1 ,
wherein the second transistor has a current driving capability greater than a current driving capability of the first transistor.
3. The drive circuit according to claim 1 ,
wherein a plurality of buffer circuits are provided in stages, each of the plurality of buffer circuits being the buffer circuit,
a plurality transfer circuits are provided in stages in correspondence with the plurality of buffer circuits provided in stages,
the first transistor included in Nth-stage buffer circuit, among the plurality of buffer circuits provided in stages, is turned on based on one of rise and fall of a first control signal outputted from an Nth-stage transfer circuit among the plurality of transfer circuits provided in stages, and
the second transistor included in the Nth-stage buffer circuit is turned on based on the one of the rise and fall of the first control signal outputted from the Nth-stage transfer circuit, and is turned off based on the other of the rise and fail of the first control signal.
4. The drive circuit according to claim 1 ,
wherein a plurality of buffer circuits are provided in stages, each of the plurality of buffer circuits being the buffer circuit,
a plurality transfer circuits are provided in stages in correspondence with the plurality of buffer circuits provided in stages,
the second transistor included in an Nth-stage buffer circuit, among the plurality of buffer circuits provided in stages, is turned on and off based on a first control signal and a second control signal outputted from an Nth-stage transfer circuit and an (N+1)th and subsequent stage transfer circuit, respectively, among the plurality of buffer circuits provided in stages.
5. The drive circuit according to claim 4 ,
wherein the second transistor included in the Nth-stage buffer circuit is turned on and off based on the first control signal outputted from the Nth-stage transfer circuit and the second control signal outputted from the (N+1)th-stage transfer circuit.
6. The drive circuit according to claim 1 ,
wherein the buffer circuit further includes an auxiliary transistor that maintains the second transistor at off when a voltage outputted from the output terminal is changed.
7. The drive circuit according to claim 1 ,
wherein the drive circuit supplies a drive signal to a pixel circuit including a plurality of pixels via the output terminal, and rise or fall of the drive signal indicates timing of start or end of specific processing for at least one of the plurality of pixels.
8. A drive circuit that outputs from an output terminal a drive signal that assumes an ON potential and an OFF potential, the drive circuit comprising
an ON potential output holding unit and an ON potential output unit that are connected in parallel between a first power supply and the output terminal, and place the first power supply and the output terminal in a conducting state or a non-conducting state,
wherein the ON potential output holding unit outputs the ON potential to the output terminal and holds the ON potential by maintaining the first power supply and the output terminal at a conducting state, and
the ON potential output unit outputs the ON potential to the output terminal by placing the first power supply and the output terminal in a conducting state for a certain period after the ON potential output holding unit outputs the ON potential to the output terminal.
9. The drive circuit according to claim 8 , further comprising
an OFF potential output holding unit and an OFF potential output unit that are connected in parallel between a second power supply and the output terminal, and place the second power supply and the output terminal in a conducting state or a non-conducting state,
wherein the OFF potential output holding unit outputs the OFF potential to the output terminal and holds the OFF potential by maintaining the second power supply and the output terminal at a conducting state, and
the OFF potential output unit outputs the OFF potential to the output terminal by placing the second power supply and the output terminal in a conducting state for a certain period after the OFF potential output holding unit outputs the OFF potential to the output terminal.