Solid-state imaging device and camera system
A solid-state imaging device includes: a pixel section wherein pixels including photoelectric conversion devices are arranged in a matrix; and a pixel driving section including a row selection circuit which controls the pixels to perform an electronic shutter operation and readout of the pixel section. The row selection circuit has a function of selecting a readout row from which a signal is read out and a shutter row on which reset is performed by discharging charge accumulated in the photoelectric conversion devices, in accordance with address and control signals. The row selection circuit can set, in accordance with the address and control signals, in the pixels of the selected row, at least a readout state, a discharge state where a smaller amount of the charge accumulated in the photoelectric conversion devices than the reset is discharged, an electronic shutter state, and a charge state where the charge is accumulated in the photoelectric conversion devices.
1. A solid-state imaging device comprising:
a selection circuit configured to perform a transition from a discharge state to an electronic shutter state;
a reset transistor that is controllable to provide an electrical connection and disconnection between a power source line and a floating diffusion, a gate electrode of the reset transistor is configured to receive a reset gate control signal from the selection circuit; and
a transfer transistor that is controllable to provide an electrical connection and disconnection between a photoelectric conversion device and the floating diffusion, a gate electrode of the transfer transistor is configured to receive a transfer gate control signal from the selection circuit,
wherein a middle voltage is lower than a first level voltage, a second level voltage is lower than the middle voltage,
wherein during the discharge state, the reset gate control signal is at the first level voltage and the transfer gate control signal is at the middle voltage,
wherein during the electronic shutter state, the reset gate control signal is at the first level voltage and the transfer gate control signal transitions between the first level voltage and the second level voltage, and
wherein the reset gate control signal is fixed at the first level voltage throughout the transition from the discharge state to the electronic shutter state.
2. The solid-state imaging device according to the claim 1 , wherein the photoelectric conversion device is configured to convert an optical signal into a signal charge.
3. The solid-state imaging device according to the claim 1 , wherein the transfer transistor is configured to electrically connect the floating diffusion to the photoelectric conversion device when the transfer gate control signal is at either the first level voltage or at the middle voltage.
4. The solid-state imaging device according to the claim 1 , wherein the transfer transistor is configured to electrically disconnect the floating diffusion from the photoelectric conversion device when the transfer gate control signal is at the second level voltage.
5. The solid-state imaging device according to the claim 1 , wherein the reset transistor is configured to electrically connect the floating diffusion to the power source line when the reset gate control signal is at either the first level voltage or at the middle voltage.
6. The solid-state imaging device according to the claim 1 , wherein the reset transistor is configured to electrically disconnect the floating diffusion from the power source line when the reset gate control signal is at the second level voltage.
7. The solid-state imaging device according to the claim 1 , wherein a gate electrode of an amplifying transistor is electrically connected to the floating diffusion.
8. The solid-state imaging device according to the claim 7 , further comprising:
a selection transistor that is controllable to provide an electrical connection and disconnection between the amplifying transistor and an output signal line.
9. The solid-state imaging device according to the claim 1 , wherein the selection circuit is configured to perform a transition from the electronic shutter state to a charge state.
10. The solid-state imaging device according to the claim 9 , wherein during the charge state, the reset gate control signal is at the first level voltage and the transfer gate control signal is at the middle voltage.
11. The solid-state imaging device according to the claim 9 , wherein the transfer gate control signal is fixed at the middle voltage throughout the transition from the electronic shutter state to the charge state.
12. The solid-state imaging device according to the claim 9 , wherein the selection circuit is configured to perform a transition from the charge state to a readout state.
13. The solid-state imaging device according to the claim 12 , wherein the reset gate control signal transitions between the first level voltage and the second level voltage during the readout state.
14. The solid-state imaging device according to the claim 12 , wherein the transfer gate control signal transitions between the first level voltage and the second level voltage during the readout state.
15. The solid-state imaging device according to the claim 12 , wherein the charge state includes a first charge state and a second charge state, the selection circuit is configured to perform a transition from the first charge state to the second charge state.
16. The solid-state imaging device according to the claim 15 , wherein during the first charge state, the transfer gate control signal is at a different middle voltage.
17. The solid-state imaging device according to the claim 16 , wherein during the second charge state, the transfer gate control signal is at the second level voltage.
18. The solid-state imaging device according to the claim 16 , wherein the middle voltage is higher than the different middle voltage, the different middle voltage is higher than the second level voltage.
19. The solid-state imaging device according to the claim 12 , wherein the selection circuit is configured to perform a transition from the readout state to the discharge state.