CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Chinese Patent Application No. 202010617318.X, filed on Jun. 30, 2020, which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the field of display technologies, and in particular, to a driving circuit and a driving method thereof, a display panel and a display device.

BACKGROUND

Compared with a liquid crystal display (LCD), an organic light-emitting diode (OLEO) display has advantages such as low power consumption, low production cost, self-luminosity, wide viewing angle, quick response, etc., and has become a hot spot of research at the moment.

SUMMARY

In one aspect, a driving circuit is provided. The driving circuit includes at least one pixel circuit and a control circuit. Each pixel circuit is coupled to a scan signal terminal, a first data signal terminal, a second signal terminal, and an enable signal terminal. The control circuit is coupled to a second data signal terminal and the at least one pixel circuit. The pixel circuit is configured to write a first data signal received at the first data signal terminal in response to a scan signal received at the scan signal terminal; and generate a first driving signal according to a first signal and the first data signal. The control circuit is configured to monitor the first driving signal, and provide another first data signal to the pixel circuit according to a second data signal received at the second data signal terminal and the first driving signal. The pixel circuit is configured to be further coupled to a light-emitting device, and is further configured to: provide another first driving signal to the light-emitting device according to the first signal and the another first data signal; and in response to an enable signal received at the enable signal terminal, provide a second driving signal to the light-emitting device according to a second signal received at the second signal terminal and the another first data signal. An amplitude of the another first driving signal and an amplitude of the second driving signal are approximately equal.

In some embodiments, the pixel circuit is configured to provide the another first driving signal with an amplitude in direct proportion to an amplitude of the second data signal to the light-emitting device according to the first signal and the another first data signal.

In some embodiments, the control circuit includes a current monitoring sub-circuit and an output sub-circuit. The current monitoring sub-circuit is coupled to the at least one pixel circuit. The output sub-circuit is coupled to the at least one pixel circuit, the second data signal terminal and the current monitoring sub-circuit. The current monitoring sub-circuit is configured to monitor the first driving signal, and output a third signal according to the first driving signal. The output sub-circuit is configured to output the another first data signal to the pixel circuit according to the third signal from the current monitoring sub-circuit and the second data signal.

In some embodiments, the current monitoring sub-circuit includes a resistor and a first amplifier. A first end of the resistor is coupled to the at least one pixel circuit. A first input terminal of the first amplifier is coupled to the first end of the resistor, and a second input terminal of the first amplifier is coupled to a second end of the resistor. The output sub-circuit includes a second amplifier. A first input terminal of the second amplifier is coupled to an output terminal of the first amplifier, a second input terminal of the second amplifier is coupled to the second data signal terminal, and an output terminal of the second amplifier is coupled to the at least one pixel circuit.

In some embodiments, the control circuit further includes a voltage follower sub-circuit. The voltage follower sub-circuit is coupled to a first signal terminal, the second signal terminal and the at least one pixel circuit. The voltage follower sub-circuit is configured to provide the first signal having a same amplitude as the second signal to the pixel circuit according to a previous first signal from the first signal terminal and the second signal from the second signal terminal.

In some embodiments, the voltage follower sub-circuit includes a third amplifier. A first input terminal of the third amplifier is coupled to the first signal terminal, a second input terminal of the third amplifier is coupled to the second signal terminal, and an output terminal of the third amplifier is coupled to the at least one pixel circuit.

In some embodiments, the first signal terminal and the second signal terminal are included in the driving circuit, and the first signal terminal is coupled to the second signal terminal.

In some embodiments, the driving circuit further includes at least one selection circuit coupled to the control circuit. A selection circuit in the at least one selection circuit is coupled to at least the scan signal terminal, the voltage follower sub-circuit and the second signal terminal. The selection circuit is configured to transmit the second signal from the second signal terminal to the voltage follower sub-circuit in response to the scan signal received at the scan signal terminal.

In some embodiments, the selection circuit includes a first transistor. A control electrode of the first transistor is coupled to the scan signal terminal, a first electrode of the first transistor is coupled to the second signal terminal, and a second electrode of the first transistor is coupled to the voltage follower sub-circuit.

In some embodiments, the selection circuit is further coupled to the first signal terminal. The selection circuit is further configured to transmit the previous first signal from the first signal terminal to the voltage follower sub-circuit in response to the scan signal received at the scan signal terminal.

In some embodiments, the selection circuit includes a first transistor and a second transistor. A control electrode of the first transistor is coupled to the scan signal terminal, a first electrode of the first transistor is coupled to the second signal terminal, and a second electrode of the first transistor is coupled to the voltage follower sub-circuit. A control electrode of the second transistor is coupled to the scan signal terminal, a first electrode of the second transistor is coupled to the first signal terminal, and a second electrode of the second transistor is coupled to the voltage follower sub-circuit.

In some embodiments, the at least one pixel circuit includes pixel circuits, and the at least one selection circuit includes selection circuits, and each selection circuit is coupled to a respective one of the pixel circuits.

In some embodiments, the pixel circuit includes a driving sub-circuit, a writing sub-circuit and a light-emitting control sub-circuit. The writing sub-circuit is coupled to the scan signal terminal, the control circuit and the driving sub-circuit, and the writing sub-circuit is configured to transmit the another first data signal from the control circuit to the driving sub-circuit in response to the scan signal received at the scan signal terminal, and transmit the first signal to the driving sub-circuit in response to the scan signal received at the scan signal terminal. The light-emitting control sub-circuit is coupled to the enable signal terminal, the second signal terminal and the driving sub-circuit, and the light-emitting control sub-circuit is configured to transmit the second signal from the second signal terminal to the driving sub-circuit in response to the enable signal received at the enable signal terminal. The driving sub-circuit is configured to be coupled to the light-emitting device, and is configured to provide the another first driving signal to the light-emitting device according to the another first data signal and the first signal, and provide the second driving signal to the light-emitting device according to the another first data signal and the second signal.

In some embodiments, the driving circuit includes a driving transistor and a capacitor. A control electrode of the driving transistor is coupled to a first electrode of the capacitor, a first electrode of the driving transistor is coupled to a second electrode of the capacitor, and a second electrode of the driving transistor is configured to be coupled to the light-emitting device.

In some embodiments, the writing sub-circuit includes a third transistor and a fourth transistor. A control electrode of the third transistor is coupled to the scan signal terminal, a first electrode of the third transistor is coupled to the first data signal terminal, and a second electrode of the third transistor is coupled to the driving sub-circuit. A control electrode of the fourth transistor is coupled to the scan signal terminal, a first electrode of the fourth transistor is coupled to the control circuit, and a second electrode of the fourth transistor is coupled to the driving sub-circuit.

In some embodiments, the light-emitting control sub-circuit includes a fifth transistor. A control electrode of the fifth transistor is coupled to the enable signal terminal, a first electrode of the fifth transistor is coupled to the second signal terminal, and a second electrode of the fifth transistor is coupled to the driving sub-circuit.

In another aspect, a display panel is provided. The display panel includes the driving circuit as described in any of the above embodiments and a plurality of light-emitting devices coupled to the driving circuit.

In yet another aspect, a display device is provided. The display device includes the display panel as described in the above embodiment.

In yet another aspect, a driving method of a driving circuit is provided. The driving circuit includes at least one pixel circuit and a control circuit. The driving method includes: writing, by each pixel circuit, a first data signal received at a first data signal terminal in response to a scan signal received at a scan signal terminal, generating, by the pixel circuit, a first driving signal according to a first signal and the first data signal; and monitoring, by the control circuit, the first driving signal; providing, by the control circuit, another first data signal to the pixel circuit according to the first driving signal and a second data signal received at a second data signal terminal; providing, by the pixel circuit, another first driving signal to a light-emitting device according to the first signal and the another first data signal; and in response to an enable signal received at an enable signal terminal, providing, by the pixel circuit, a second driving signal to the light-emitting device according to a second signal received at a second signal terminal and the another first data signal, wherein an amplitude of the another first driving signal and an amplitude of the second driving signal are approximately equal.

In some embodiments, the first signal and the second signal are approximately identical.

