Pixel circuit and display device
The present disclosure relates to a pixel circuit and a display device. The pixel circuit includes: a pixel unit including: an operation current generating module including a gate voltage terminal and a drain voltage terminal and adapted to generate an operation current based on a voltage at the gate voltage terminal; and a light-emitting control module connected in series with the operation current generating module and adapted to control whether or not to provide the operation current to a light-emitting device based on a light-emitting control signal; and a driving control circuit, including: a feedback module for receiving a first input voltage and a data current and adapted to provide a feedback loop between the gate voltage terminal and the drain voltage terminal; and a data current module adapted to provide the data current.
1. A pixel circuit, comprising:
a pixel unit comprising:
an operation current generating module comprising a gate voltage terminal and a drain voltage terminal and adapted to generate an operation current based on a voltage at the gate voltage terminal; and
a light-emitting control module connected in series with the operation current generating module and adapted to control whether or not to provide the operation current to a light-emitting device based on a light-emitting control signal; and
a driving control circuit comprising:
a feedback module for receiving a first input voltage and a data current and adapted to provide a feedback loop between the gate voltage terminal and the drain voltage terminal; and
a data current module adapted to provide the data current,
wherein the data current module is connected to a data voltage terminal, and the data current module is adapted to generate the data current based on a voltage at the data voltage terminal; and
the data current module comprises an operational amplifier and a resistor, and the data current module is adapted to generate the data current based on a voltage at the data voltage terminal, the operational amplifier comprises a first input terminal connected to the data voltage terminal, a second input terminal, and an output terminal connected to the second input terminal of the operational amplifier, and the resistor comprises a firs terminal connected to the output terminal of the operational amplifier, and a second terminal connected to the drain voltage terminal.
2. The pixel circuit according to claim 1 , further comprising a brightness adjustment module, wherein the brightness adjustment module is adapted to compare a voltage at the drain voltage terminal with a preset voltage and output a compensation control signal, and the compensation control signal controls the data voltage terminal to receive different data voltages.
3. The pixel circuit according to claim 2 , wherein the brightness adjustment module comprises:
a comparator comprising a first input terminal for receiving the preset voltage, a second input terminal connected to the drain voltage terminal, and an output terminal for outputting the compensation control signal; and
a gating switch comprising a first input terminal for receiving a first data voltage, a second input terminal for receiving a second data voltage, an output terminal connected to the data voltage terminal, and a control terminal for receiving the compensation control signal.
4. The pixel circuit according to claim 1 , wherein the light-emitting control module comprises a fourth transistor, and the fourth transistor comprises a gate electrode for receiving the light-emitting control signal, a drain electrode connected to an output terminal of the operation current generating module, and a source electrode connected to the light-emitting device.
5. The pixel circuit according to claim 1 , further comprising a fifth transistor, wherein the fifth transistor comprises a gate electrode for receiving a reset control signal, a source electrode for receiving a reset voltage, and a drain electrode connected to the drain voltage terminal.
6. A display device, comprising the pixel circuit according to claim 1 .
7. A pixel circuit, comprising:
a pixel unit comprising:
an operation current generating module comprising a gate voltage terminal and a drain voltage terminal and adapted to generate an operation current based on a voltage at the gate voltage terminal; and
a light-emitting control module connected in series with the operation current generating module and adapted to control whether or not to provide the operation current to a light-emitting device based on a light-emitting control signal; and
a driving control circuit comprising:
a feedback module for receiving a first input voltage and a data current and adapted to provide a feedback loop between the gate voltage terminal and the drain voltage terminal; and
a data current module adapted to provide the data current,
wherein the operation current generating module comprises:
a driving module comprising a control terminal connected to the gate voltage terminal through a first gating module and adapted to generate the operation current based on a voltage at the control terminal of the driving module, wherein the first gating module is turned on or turned off under control of a first gating control signal;
a second gating module, through which an output terminal of the driving module is connected to the drain voltage terminal, wherein the second gating module is turned on or turned off under control of a second gating control signal; and
a voltage maintaining module configured to maintain the voltage at the control terminal of the driving module when the first gating module is turned off.
8. The pixel circuit according to claim 7 , wherein the driving module comprises a first transistor, and the first transistor comprises a source electrode connected to a power supply, a gate electrode being the control terminal of the driving module, and a drain electrode being the output terminal of the driving module.
9. The pixel circuit according to claim 7 , wherein the first gating module comprises a second transistor, and the second transistor comprises a gate electrode for receiving the first gating control signal, a source electrode connected to the control terminal of the driving module, and a drain electrode connected to the gate voltage terminal.
10. The pixel circuit according to claim 7 , wherein the second gating module comprises a third transistor, and the third transistor comprises a gate electrode for receiving the second gating control signal, a drain electrode connected to the drain voltage terminal, and a source electrode connected to the output terminal of the driving module.
11. The pixel circuit according to claim 7 , wherein the voltage maintaining module comprises a capacitor, and the capacitor comprises a first electrode plate connected to the control terminal of the driving module, and a second electrode plate connected to a reference voltage terminal.
12. The pixel circuit according to claim 11 , further comprising a brightness adjustment module, wherein the brightness adjustment module is adapted to compare a voltage at the drain voltage terminal with a preset voltage and output a compensation control signal, and the compensation control signal controls the reference voltage terminal to receive different reference voltages.
13. The pixel circuit according to claim 12 , wherein the brightness adjustment module comprises:
a comparator comprising a first input terminal for receiving the preset voltage, a second input terminal connected to the drain voltage terminal, and an output terminal for outputting the compensation control signal; and
a gating switch comprising a first input terminal for receiving a first reference voltage, a second input terminal for receiving a second reference voltage, an output terminal connected to the reference voltage terminal, and a control terminal for receiving the compensation control signal.
14. A pixel circuit, comprising:
a pixel unit comprising:
an operation current generating module comprising a gate voltage terminal and a drain voltage terminal and adapted to generate an operation current based on a voltage at the gate voltage terminal; and
a light-emitting control module connected in series with the operation current generating module and adapted to control whether or not to provide the operation current to a light-emitting device based on a light-emitting control signal; and
a driving control circuit comprising:
a feedback module for receiving a first input voltage and a data current and adapted to provide a feedback loop between the gate voltage terminal and the drain voltage terminal; and
a data current module adapted to provide the data current,
wherein the feedback module comprises a voltage buffer, and the voltage buffer comprises a first input terminal connected to the drain voltage terminal and to an output terminal of the data current module, a second input terminal for receiving the first input voltage, and an output terminal connected to the gate voltage terminal.