Circuit for selectively refreshing different regions of a display screen, and display screen and electronic device

A display screen, comprising a pixel array, a pixel driving circuit, an array driving circuit, and a driving signal output circuit, wherein

• the array driving circuit comprises a row scan driving circuit, and the row scan driving circuit generates a row scan signal for driving a pixel row in the pixel array;
• an input end of the driving signal output circuit is connected to an output end of the row scan driving circuit, a control end of the driving signal output circuit receives a row address selection signal, and the row scan signal is inputted to the input end of the driving signal output circuit;
• when the row address selection signal is active, the driving signal output circuit outputs the row scan signal, and the row address selection signal is generated, based on the pixel row having a changed display state, by an integrated circuit that has a memory and that is coupled to the display screen;
• and
• when the row address selection signal is inactive, the driving signal output circuit outputs a low-level signal;
• wherein the driving signal output circuit comprises a selection circuit and an output circuit;
• an input end of the selection circuit is connected to the output end of the row scan driving circuit, a control end of the selection circuit receives the row address selection signal, an output end of the selection circuit is connected to an input end of the output circuit, the selection circuit is configured to:
• output a pulse signal having a frequency the same as that of the row scan signal when the row address selection signal is active;
• and output a constant-level signal when the row address selection signal is inactive;
• and
• the output circuit is configured to:
• generate a write driving signal having a driving capability based on the pulse signal and output the write driving signal, or output a constant negative voltage signal based on the constant-level signal;
• a horizontal scan line of the pixel driving circuit is coupled to the driving signal output circuit, a data line of the pixel driving circuit is coupled to a column driving circuit, and the pixel driving circuit is configured to control display states of a part of pixels in the pixel array based on the row scan signal and a data signal;
• wherein the selection circuit comprises a first inverter circuit, a third branch, and a fourth branch;
• the row address selection signal is inputted to an input end of the first inverter circuit, and an output end of the first inverter circuit is connected to a control end of the third branch;
• and
• the third branch comprises a ninth switching transistor and a tenth switching transistor that are connected in series, control terminals of the ninth switching transistor and the tenth switching transistor are the control end of the third branch, a positive voltage signal is inputted to a first terminal of the ninth switching transistor, and a negative voltage signal is inputted to a first terminal of the tenth switching transistor;
• and
• the fourth branch comprises an eleventh switching transistor, a twelfth switching transistor, a thirteenth switching transistor, and a fourteenth switching transistor that are sequentially connected in series, a negative voltage signal is inputted to a first terminal of the eleventh switching transistor, a positive voltage signal is inputted to a first terminal of the fourteenth switching transistor, the row scan signal is inputted to control terminals of the eleventh switching transistor and the fourteenth switching transistor, a control terminal of the twelfth switching transistor is connected to a series common terminal of the ninth switching transistor and the tenth switching transistor, and a control terminal of the thirteenth switching transistor is connected to the output end of the first inverter circuit.

An electronic device, wherein the electronic device comprises:

• one or more processors, a memory, and a display screen, wherein the display screen comprises a pixel array, a pixel driving circuit, an array driving circuit, and a driving signal output circuit, wherein
• the array driving circuit comprises a row scan driving circuit, and the row scan driving circuit generates a row scan signal for driving a pixel row in the pixel array;
• an input end of the driving signal output circuit is connected to an output end of the row scan driving circuit, a control end of the driving signal output circuit receives a row address selection signal, and the row scan signal is inputted to the input end of the driving signal output circuit;
• when the row address selection signal is active, the driving signal output circuit outputs the row scan signal, and the row address selection signal is generated, based on the pixel row having a changed display state, by an integrated circuit that has a memory and that is coupled to the display screen;
• when the row address selection signal is inactive, the driving signal output circuit outputs a low-level signal;
• the driving signal output circuit comprises a selection circuit and an output circuit;
• an input end of the selection circuit is connected to the output end of the row scan driving circuit, a control end of the selection circuit receives the row address selection signal, an output end of the selection circuit is connected to an input end of the output circuit, the selection circuit is configured to:
• output a pulse signal having a frequency the same as that of the row scan signal when the row address selection signal is active;
• and output a constant-level signal when the row address selection signal is inactive;
• the output circuit is configured to:
• generate a write driving signal having a driving capability based on the pulse signal and output the write driving signal, or output a constant negative voltage signal based on the constant-level signal;
• a horizontal scan line of the pixel driving circuit is coupled to the driving signal output circuit, a data line of the pixel driving circuit is coupled to a column driving circuit, and the pixel driving circuit is configured to control display states of a part of pixels in the pixel array based on the row scan signal and a data signal;
• the selection circuit comprises a load circuit and a signal latch circuit, and the load circuit comprises a first voltage division bridge arm and a second voltage division bridge arm;
• the row address selection signal is inputted to an input end of the signal latch circuit, and a signal of an output end of the signal latch circuit is held as the signal inputted from the input end of the signal latch circuit;
• and
• the first voltage division bridge arm has one end to which a positive voltage signal is inputted and another end that is connected to the output end of the signal latch circuit, the second voltage division bridge arm is connected in parallel to the first voltage division bridge arm, a common node of an upper transistor and a lower transistor of the second voltage division bridge arm is connected to the input end of the output circuit, and the row scan signal is inputted to a control terminal of the lower transistor.