Pixel circuit and method of driving the same, display device

Abstract

The present disclosure relates to a pixel circuit and a method of driving the same, and a display device. A pixel circuit, including: a light emitting device; a driving sub-circuit configured to drive the light emitting device, the driving sub-circuit including a driving transistor configured to generate a driving current flowing through the light emitting device so that the light emitting device emits light; and a reset sub-circuit configured to reset a voltage between a gate electrode and a second electrode of the driving transistor.

What is claimed is: 
     
         1 . A pixel circuit, including:
 a light emitting device;   a driving sub-circuit configured to drive the light emitting device, the driving sub-circuit including a driving transistor configured to generate a driving current flowing through the light emitting device so that the light emitting device emits light; and   a reset sub-circuit comprises a first transistor and a second transistor; the first transistor is electronically connected between a gate electrode of the driving transistor and an initial voltage terminal, the second transistor is electronically connected between a gate electrode of the driving transistor and a second electrode of the driving transistor;   the second transistor is N-type transistor, the driving transistor is P-type transistor;   the first transistor, the second transistor are configured to be turned on in a reset stage to reset the gate electrode of the driving transistor and a first electrode of the driving transistor.   
     
     
         2 . The pixel circuit according to  claim 1 , further including:
 a light emission control sub-circuit configured to transmit the driving current to the light emitting device.   
     
     
         3 . The pixel circuit according to  claim 1 , wherein the reset sub-circuit is further configured to write an initial voltage of an initial voltage terminal to the light emitting device. 
     
     
         4 . The pixel circuit according to  claim 1 , wherein a part of the reset sub-circuit is reused as at least a part of a compensation sub-circuit which is configured to compensate a threshold voltage of the driving transistor. 
     
     
         5 . The pixel circuit according to  claim 4 , wherein
 a gate electrode of the first transistor is electronically connected to a second scan signal terminal, a first electrode of the first transistor is electronically connected to the gate electrode of the driving transistor, and a second electrode of the first transistor is electronically connected to the initial voltage terminal;   electronically connected a first electrode of the second transistor is electronically connected to the second electrode of the driving transistor, and a second electrode of the second transistor is electronically connected to the gate electrode of the driving transistor.   
     
     
         6 . The pixel circuit according to  claim 3 , wherein the reset sub-circuit further includes a third transistor;
 a gate electrode of the third transistor is electronically connected to a second scan signal terminal, a first electrode of the third transistor is electronically connected to the light emitting device, and a second electrode of the third transistor is electronically connected to an initial voltage terminal.   
     
     
         7 . The pixel circuit according to  claim 5 , wherein the compensation sub-circuit includes the second transistor. 
     
     
         8 . The pixel circuit according to  claim 5 , wherein the light emission control sub-circuit includes a fourth transistor and a fifth transistor;
 a gate electrode of the fourth transistor is electronically connected to the light emission control signal terminal, a first electrode of the fourth transistor is electronically connected to a first voltage terminal, and a second electrode of the fourth transistor is electronically connected to a first electrode of the driving transistor; and   a gate electrode of the fifth transistor is electronically connected to the light emission control signal terminal, a first electrode of the fifth transistor is electronically connected to the second electrode of the driving transistor, and a second electrode of the fifth transistor is electronically connected to the light emitting device.   
     
     
         9 . The pixel circuit according to  claim 8 , wherein the write sub-circuit includes a sixth transistor, a first electrode of the sixth transistor is electronically connected to a first scan signal terminal, a first electrode of the sixth transistor is electronically connected to a data voltage terminal, and a second electrode of the sixth transistor is electronically connected to a first electrode of the driving transistor. 
     
     
         10 . The pixel circuit according to  claim 9 , wherein the sixth transistor is a P-type transistor. 
     
     
         11 . A display device, including the pixel circuit of  claim 1 . 
     
     
         12 . The display device according to  claim 11 , wherein the display device includes a display panel on which sub-pixels arranged in a matrix are disposed, the pixel circuits being arranged in the sub-pixels;
 except a first row of the sub-pixels, second scan signal terminals of the pixel circuits in a next row of sub-pixels are electronically connected to first scan signal terminals of the pixel circuits in a previous row of sub-pixels.   
     
     
         13 . A method for driving the pixel circuit according to  claim 1 , comprising:
 resetting a first electrode of the driving transistor, and writing, by the reset sub-circuit, an initial voltage of an initial voltage terminal to the gate electrode;   writing, by a writing sub-circuit, a data voltage of a data voltage terminal to the driving sub-circuit according to a control signal provided by a first scan signal terminal;   generating, by the driving sub-circuit, a driving current according to a first voltage terminal, a second voltage terminal, and a data voltage written to the driving sub-circuit; and   emitting light by the light emitting device according to the driving current.   
     
     
         14 . The method according to  claim 13 , further including: compensating, by a compensation sub-circuit, a threshold voltage of the driving transistor in the driving sub-circuit. 
     
     
         15 . The method according to  claim 13 , wherein the reset sub-circuit is electronically connected to a second scan signal terminal and a light emission control signal terminal; the reset sub-circuit includes a first transistor and a second transistor, wherein a gate electrode of the first transistor is electronically connected to the second scan signal terminal, a first electrode of the first transistor is electronically connected to the gate electrode of the driving transistor, and a second electrode of the first transistor is electronically connected to the initial voltage terminal; a first electrode of the second transistor is electronically connected to the second electrode of the driving transistor, a second electrode of the second transistor is electronically connected to the gate electrode of the driving transistor, and the driving transistor is a P-type transistor, setting a first electrode of the driving transistor to a float state and writing, by the reset sub-circuit, an initial voltage of an initial voltage terminal to the gate electrode and the second electrode of the driving transistor in the driving sub-circuit includes:
 resetting the first electrode of the driving transistor;   providing a signal of the second scan signal terminal to the gate electrode of the first transistor of the reset sub-circuit so that the first transistor is turned on;   providing the initial voltage of the initial voltage terminal to the first electrode of the first transistor so that the initial voltage of the initial voltage terminal is written to the gate electrode of the driving transistor; and   providing a signal of the light emission control signal terminal to the gate electrode of the second transistor of the reset sub-circuit, so that the second transistor is turned on, the gate electrode of the driving transistor is electrically electronically connected to the second electrode of the driving transistor through the first electrode of the second transistor and the second electrode of the second transistor.   
     
     
         16 . A pixel circuit, including:
 a light emitting device;   a driving transistor;   a first transistor being electronically connected to a gate electrode of the driving transistor and an initial voltage terminal;   a second transistor being electronically connected to the gate electrode of the driving transistor and a second electrode of the driving transistor;   a third transistor being electronically connected to the light emitting device;   a fourth transistor being electronically connected to a first electrode of the driving transistor and a first voltage terminal;   a fifth transistor being electronically connected to a second electrode of the driving transistor and the light emitting device;   a sixth transistor being electronically connected to the first electrode of the driving transistor and a data voltage terminal;   wherein the second transistor is a N-type transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor and the driving transistor are P-type transistors;   wherein the first transistor, the second transistor are configured to be turned on in a reset stage to reset the gate electrode of the driving transistor and a first electrode of the driving transistor.