CN111883055B

CN111883055B - Pixel circuit and driving method thereof

Info

Publication number: CN111883055B
Application number: CN202010753219.4A
Authority: CN
Inventors: 马建东; 肖一鸣
Original assignee: Vicino Technology Co ltd
Current assignee: Vicino Technology Co ltd
Priority date: 2020-07-30
Filing date: 2020-07-30
Publication date: 2021-09-10
Anticipated expiration: 2040-07-30
Also published as: CN111883055A

Abstract

The embodiment of the invention discloses a pixel circuit and a driving method thereof. The driving method includes: acquiring gray scale data of the pixel circuit in two adjacent display frames, wherein the gray scale data comprises display gray scales and corresponding data voltages; calculating data voltage corresponding to the black insertion gray scale according to gray scale data corresponding to at least one previous display frame in the two adjacent display frames; in the black insertion stage between two adjacent display frames, data voltage corresponding to the black insertion gray scale is written into a grid electrode of a driving transistor of the pixel circuit, first power supply voltage is written into a first pole of the driving transistor, and a turn-off control signal is provided for a light-emitting control module in the pixel circuit. According to the technical scheme provided by the embodiment of the invention, the bias voltage is applied to the driving transistor after the previous display frame in the two adjacent display frames is displayed, so that the hysteresis of the driving transistor is reset, the hysteresis effect caused by the change of the data voltage of the grid electrode of the driving transistor during the switching of different gray-scale pictures is reduced, and the problem of image sticking is further improved.

Description

Pixel circuit and driving method thereof

Technical Field

The embodiment of the invention relates to the technical field of display, in particular to a pixel circuit and a driving method thereof.

Background

With the continuous development of display technology, Organic Light Emitting Diode (OLED) display panels have been widely used in the field of photoelectric display by virtue of their excellent characteristics of self-luminescence, high brightness, wide viewing angle, etc.

A plurality of pixel circuits are generally included in the display panel, wherein the pixel circuits include driving transistors that generate driving signals to drive the light emitting elements to emit light for display. In the prior art, when the display image is switched, the display panel has a ghost phenomenon, so that the display effect is reduced, and the user experience effect is poor.

Disclosure of Invention

The embodiment of the invention provides a pixel circuit and a driving method thereof, which are used for improving display ghost when a display picture is switched.

In a first aspect, an embodiment of the present invention provides a driving method for a pixel circuit, including:

acquiring gray scale data of the pixel circuit in two adjacent display frames, wherein the gray scale data comprises display gray scales and corresponding data voltages;

calculating data voltage corresponding to the black insertion gray scale according to gray scale data corresponding to at least one previous display frame in the two adjacent display frames;

and writing data voltage corresponding to the black insertion gray scale into a grid electrode of a driving transistor of the pixel circuit in a black insertion stage between two adjacent display frames, writing a first power supply voltage into a first pole of the driving transistor, and providing a turn-off control signal for a light-emitting control module in the pixel circuit.

Optionally, the data voltage corresponding to the black insertion gray scale is inversely related to the data voltage corresponding to the pixel circuit in the previous frame in the two adjacent display frames.

Optionally, the calculating the data voltage corresponding to the black insertion gray scale according to the gray scale data corresponding to at least the previous display frame in the two adjacent display frames includes:

calculating the black insertion gray scale according to gray scale data corresponding to the pixel circuit in the previous display frame in the two adjacent display frames;

preferably, the black insertion gray scale is equal to the difference between the maximum gray scale and the display gray scale of the pixel circuit in the previous display frame in the two adjacent display frames;

and determining the data voltage corresponding to the black insertion gray scale according to the black insertion gray scale.

calculating the black insertion gray scale according to gray scale data corresponding to the pixel circuit in the previous display frame and gray scale data corresponding to the pixel circuit in the next display frame in the two adjacent display frames; the black insertion gray scale is inversely related to the gray scale of the pixel circuit in the previous display frame in the two adjacent display frames, and the black insertion gray scale is positively related to the gray scale of the pixel circuit in the next display frame in the two adjacent display frames;

Optionally, the black insertion gray scale is equal to 2 times of a difference value between a display gray scale of a next display frame and a display gray scale of a previous display frame in the two adjacent display frames.

if the black insertion gray scale is larger than the maximum gray scale, setting the data voltage corresponding to the black insertion gray scale as the data voltage corresponding to the maximum gray scale;

and if the black insertion gray scale is smaller than the minimum gray scale, setting the data voltage corresponding to the black insertion gray scale as the data voltage corresponding to the minimum gray scale.

Optionally, the time of the black insertion phase is less than one frame time of the display frame.

Optionally, the method includes a black insertion frame between two adjacent display frames, and in a black insertion stage between two adjacent display frames, writing a data voltage corresponding to the black insertion gray scale into a gate of a driving transistor of the pixel circuit, writing a first power voltage into a first pole of the driving transistor, and providing a turn-off control signal to a light-emitting control module in the pixel circuit, including:

writing a data voltage corresponding to the black insertion gray scale into a gate electrode of a driving transistor of the pixel circuit in the black insertion frame, writing a first power supply voltage into a first pole of the driving transistor, and providing a turn-off control signal for a light-emitting control module in the pixel circuit;

the black insertion frame is equal in time to the display frame.

Optionally, the light-emitting control module includes a first light-emitting control unit and a second light-emitting control unit, and the first light-emitting control unit, the driving transistor, the second light-emitting control unit and the light-emitting module are connected in series between a first power end and a second power end in sequence; the pixel circuit further comprises a first electrode voltage writing module, a data voltage writing module and a compensation module, wherein the first electrode voltage writing module is connected with the first light-emitting control unit in parallel;

in the black insertion stage between two adjacent display frames, writing a data voltage corresponding to the black insertion gray scale into a gate of a driving transistor of the pixel circuit, writing a first power voltage into a first pole of the driving transistor, and providing a turn-off control signal to a light-emitting control module in the pixel circuit, the method further includes:

in a first sub-stage of the black insertion stage, providing a conduction control signal to the data voltage writing module and the compensation module so as to write a data voltage corresponding to the black insertion gray scale into a gate of a driving transistor of the pixel circuit;

in a second sub-phase of the black insertion phase, providing a conducting control signal to the first voltage writing module so that the first power voltage of the first power end is written into the first electrode of the driving transistor;

and providing a turn-off control signal to the first light-emitting control unit and the second light-emitting control unit in the black insertion stage.

In a second aspect, an embodiment of the present invention further provides a pixel circuit, where the pixel circuit is driven by the driving method of the pixel circuit according to the first aspect. The pixel circuit includes: the device comprises a driving transistor, a data voltage writing module, a storage module, a compensation module, a light emitting module, a first electrode voltage writing module and a light emitting control module;

the control end of the data voltage writing module is connected with a first scanning signal input end, the first end of the data voltage writing module is connected with a data voltage input end, the second end of the data voltage writing module is connected with the first pole of the driving transistor, the grid electrode of the driving transistor is connected with the first end of the compensation module, the second end of the compensation module is connected with the second pole of the driving transistor, and the control end of the compensation module is connected with the first scanning signal input end;

the memory module is connected between the first power supply end and the grid electrode of the driving transistor;

the light-emitting control module comprises a first light-emitting control unit and a second light-emitting control unit, wherein a control end of the first light-emitting control unit and a control end of the second light-emitting control unit are both connected with a light-emitting control signal input end, a first end of the first light-emitting control unit is connected with a first power supply end, a second end of the first light-emitting control unit is connected with a first pole of the driving transistor, a first end of the second light-emitting control unit is connected with a second pole of the driving transistor, a second end of the second light-emitting control unit is connected with an anode of the light-emitting module, and a cathode of the light-emitting module is connected with a second power supply end;

the control end of the first pole voltage writing module is connected with the voltage control signal input end, the first end of the first pole voltage writing module is connected with the first end of the first light emitting control unit, and the second end of the first pole voltage writing module is connected with the second end of the first light emitting control unit;

the data voltage writing module and the compensation module are used for writing data voltages corresponding to the black insertion gray scales into the grid electrode of the driving transistor in a black insertion stage between two adjacent display frames; the first electrode voltage writing module is used for writing a first power supply voltage to a first electrode of the driving transistor in the black insertion stage; the light-emitting control module is used for being turned off in the black insertion stage.

The embodiment of the invention provides a pixel circuit and a driving method thereof, wherein gray scale data of the pixel circuit in two adjacent display frames are obtained, data voltage corresponding to black insertion gray scale is calculated according to the gray scale data corresponding to at least one previous display frame in the two adjacent display frames, the data voltage corresponding to the black insertion gray scale is written into a grid electrode of a driving transistor of the pixel circuit in a black insertion stage between the two adjacent display frames, and first power supply voltage is written into a first pole of the driving transistor, namely, bias voltage is applied to the driving transistor after a previous display frame in the two adjacent display frames displays a picture, so that hysteresis of the driving transistor is reset, hysteresis effect caused by the change of the data voltage written into the grid electrode of the driving transistor in the switching of different gray scale pictures is reduced, and therefore, the problem of image sticking can be improved. In addition, when writing the data voltage corresponding to the black insertion gray scale into the gate of the driving transistor of the pixel circuit and writing the first power supply voltage into the first pole of the driving transistor, a turn-off control signal is provided for the light-emitting control module, so that the light-emitting module is in a non-light-emitting state, and the adverse effect on the display effect caused by the fact that the light-emitting module is stolen to be bright in the black insertion stage is avoided.

Drawings

FIG. 1 is a graph illustrating a driving current output from a driving transistor in a prior art image sticking phenomenon;

fig. 2 is a flowchart of a driving method of a pixel circuit according to an embodiment of the invention;

fig. 3 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;

fig. 4 is a flowchart of another driving method of a pixel circuit according to an embodiment of the invention;

fig. 5 is a flowchart of another driving method of a pixel circuit according to an embodiment of the invention;

FIG. 6 is a timing diagram illustrating a black insertion method according to an embodiment of the present invention;

fig. 7 is a flowchart of another driving method of a pixel circuit according to an embodiment of the invention;

FIG. 8 is a timing diagram illustrating another black insertion method according to an embodiment of the present invention;

fig. 9 is a flowchart of another driving method of a pixel circuit according to an embodiment of the invention;

fig. 10 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;

fig. 11 is a driving timing diagram of a pixel circuit according to an embodiment of the invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

As described in the background art, when the display frames of the conventional display panel are switched, the frame of the previous display frame does not disappear immediately, the visual effect of the conventional display panel and the frame of the next display frame appear simultaneously, and the image sticking phenomenon exists, and the reason for the image sticking phenomenon is related to the hysteresis effect of the driving transistor in the pixel circuit. Due to the hysteresis effect of the driving transistor, the display panels displaying different display gray scales have different luminance when being switched to the same display gray scale, namely, the driving current generated by the driving transistor has different magnitudes. FIG. 1 is a graph illustrating a driving current outputted from a driving transistor in a conventional image sticking phenomenon. Referring to fig. 1, a dashed line 100 is a variation of a driving current when the display screen is switched from a maximum gray level (the maximum gray level is L255, i.e., 255 gray levels in fig. 1) to an intermediate gray level (the intermediate gray level is 48 gray levels in fig. 1), and a solid line 200 is a variation of the driving current when the display screen is switched from a minimum gray level (the minimum gray level is L0, i.e., 0 gray level in fig. 1) to the same intermediate gray level. When the display frame is switched from the maximum gray scale to the intermediate gray scale, the driving current output by the driving transistor is reduced, and when the display frame is switched from the minimum gray scale to the intermediate gray scale, the driving current output by the driving transistor is increased; as can be seen from fig. 1, the hysteresis effect of the driving transistor causes the driving current to be inconsistent when the display screen is switched from the maximum gray scale to the intermediate gray scale and from the minimum gray scale to the same intermediate gray scale, that is, the hysteresis effect of the driving transistor causes the characteristic shift degrees of the driving transistor to be inconsistent under different data voltages, so that the brightness difference exists between the maximum gray scale and the minimum gray scale and the same intermediate gray scale, and the image sticking phenomenon occurs.

In view of the above, embodiments of the present invention provide a pixel circuit and a driving method thereof, in which gray scale data of the pixel circuit in two adjacent display frames is obtained, and a data voltage corresponding to a black insertion gray scale is calculated according to gray scale data corresponding to at least a previous display frame in the two adjacent display frames, and in a black insertion stage between the two adjacent display frames, the data voltage corresponding to the black insertion gray scale is written into a gate of a driving transistor of the pixel circuit, and a first power voltage is written into a first pole of the driving transistor, that is, a bias voltage is applied to the driving transistor after a display frame of the previous display frame in the two adjacent display frames is displayed, so as to reset a hysteresis of the driving transistor, so as to reduce a hysteresis effect caused by a change in the data voltage written into the gate of the driving transistor when different gray scale frames are switched, and thus, the problem of image sticking can be improved. In addition, when writing the data voltage corresponding to the black insertion gray scale into the gate of the driving transistor of the pixel circuit and writing the first power supply voltage into the first pole of the driving transistor, a turn-off control signal is provided for the light-emitting control module, so that the light-emitting module is in a non-light-emitting state, and the adverse effect on the display effect caused by the fact that the light-emitting module is stolen to be bright in the black insertion stage is avoided.

The above is the core idea of the present invention, and the following will clearly and completely describe the technical solution in the embodiment of the present invention with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.

Fig. 2 is a flowchart of a driving method of a pixel circuit according to an embodiment of the present invention, and fig. 3 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention. Wherein, the driving method shown in fig. 2 can be used for driving the pixel circuit shown in fig. 3, and referring to fig. 2 and 3, the driving method includes:

s110, gray scale data of the pixel circuit in two adjacent display frames are obtained, wherein the gray scale data comprise display gray scales and corresponding data voltages.

The display frame is usually displayed frame by frame, and the display frame may refer to a frame for displaying the image. When the pixel circuit is driven, each frame can be a display frame; in other embodiments of the present invention, a black frame insertion may be further included, and the black frame insertion is not used for displaying a picture, unlike the display frame.

Specifically, the pixel circuit includes at least a data writing phase and a light emitting phase in normal operation. In the data writing stage, the data voltage writing module 120 and the compensation module 150 are controlled to be turned on according to the first scanning signal output by the first scanning signal terminal Scan1, the data voltage Vdata is written to the gate of the driving transistor TD and one end of the storage module 130 connected to the gate of the driving transistor TD through the data voltage writing module 120, the driving transistor TD and the compensation module 150, the process is also a process of charging the storage module 130, and after the charging is completed, the data voltage Vdata is stored in the storage module 130. In the light emitting stage, the light emitting control module 160 is controlled to be turned on according to the light emitting control signal EM, so that the driving transistor TD generates a driving signal, such as a current signal, according to the voltage written by the gate thereof, and the driving transistor TD generates a driving current to drive the light emitting module 140 to emit light. When the pixel circuit displays a picture at a certain frequency, after a display frame is completed, the display of the next display frame is performed. The method includes acquiring gray scale data of a pixel circuit in two adjacent display frames, wherein the gray scale data includes display gray scales and data voltages corresponding to the display gray scales, for example, continuously receiving display frames of an nth display frame and an N +1 th display frame to acquire the gray scale data of the pixel circuit in the nth display frame and the N +1 th display frame.

S120, calculating the data voltage corresponding to the black insertion gray scale according to the gray scale data corresponding to at least the previous display frame in the two adjacent display frames.

Specifically, after gray scale data of the pixel circuit in two adjacent display frames are acquired, the data voltage corresponding to the black insertion gray scale is calculated according to the acquired gray scale data. The black insertion gray level refers to another display gray level inserted between two adjacent display gray levels, so that after the display of the previous display frame is completed, the data voltage corresponding to the black insertion gray level is written into the gate of the driving transistor TD to change the gate voltage of the driving transistor TD. The data voltage corresponding to the black insertion gray scale may be calculated according to gray scale data corresponding to a previous display frame, or may be calculated according to gray scale data corresponding to a previous display frame and a subsequent display frame.

S130, in the black insertion stage between two adjacent display frames, writing data voltage corresponding to the black insertion gray scale into the grid electrode of the driving transistor of the pixel circuit, writing first power voltage into the first pole of the driving transistor, and providing a turn-off control signal for a light-emitting control module in the pixel circuit.

Specifically, when the pixel circuit normally operates, the pixel circuit further includes a black insertion stage, where the black insertion stage is interposed between two adjacent display frames, that is, after a previous display frame of the two adjacent display frames is ended and before a next frame of the two adjacent display frames is started, to write a data voltage corresponding to a black insertion gray scale to the gate of the driving transistor TD, and write a first power voltage VDD to the first pole of the driving transistor TD, so as to apply a bias voltage to the gate and the first pole of the driving transistor TD, where the bias voltage Vgs0 is VGn-VDD, where VGn represents a data voltage corresponding to a black insertion gray scale, and as described in step 120, the data voltage corresponding to the black insertion gray scale may be calculated from gray scale data corresponding to a previous display frame, or the driving transistor TD may be calculated from gray scale data corresponding to the previous display frame and the next display frame. The data voltage corresponding to the black insertion gray scale is obtained according to the gray scale data corresponding to the previous display frame or the gray scale data corresponding to the previous display frame and the next display frame, and the first power voltage VDD is a fixed voltage, so that the bias voltage applied to the driving transistor in the black insertion stage is obtained according to the gray scale data corresponding to the previous display frame or the gray scale data corresponding to the previous display frame and the next display frame, and the hysteresis of the driving transistor is reset according to the gray scale data corresponding to the previous display frame of the pixel circuit or the bias voltage obtained according to the gray scale data corresponding to the previous display frame and the next display frame, so that the improvement of the afterimage is facilitated.

And in the black insertion stage, the light-emitting control module 160 in the pixel circuit is controlled to be turned off, so that the light-emitting module 140 does not emit light in the black insertion stage, and adverse effects on the display effect caused by the lighting of the light-emitting module in the black insertion stage (lighting in non-light-emitting stages except for the light-emitting stage is in lighting stealing mode) are avoided. Illustratively, in the data writing phase, the data voltage writing module 120 and the compensation module 150 are controlled to be turned on, the data voltage Vdata is written to the gate of the driving transistor TD through the data voltage writing module 120, the driving transistor TD and the compensation module 150 and is written to one end of the memory module 130 connected to the gate of the driving transistor TD, and the data voltage Vdata is stored in the memory module 130. In the light emitting stage, the light emitting control module 160 is controlled to be turned on according to the light emitting control signal EM, and the driving transistor TD generates a driving current to drive the light emitting module 140 to emit light. To this end, the display of one display frame (e.g., the nth display frame) is completed, and the pixel circuit enters the black insertion stage before the subsequent display frame (e.g., the N +1 th display frame) is performed. In the black insertion stage, the data voltage writing module 120 is controlled to be turned on, and the data voltage corresponding to the black insertion gray scale is written to the gate of the driving transistor TD through the data voltage writing module 120, the driving transistor TD and the compensation module 150, wherein the data voltage corresponding to the black insertion gray scale may be calculated according to the gray scale data corresponding to at least the previous display frame in the two adjacent display frames. After writing the data voltage corresponding to the black inserted gray scale into the gate of the driving transistor TD, the first voltage writing module 170 is controlled to be turned on, and the first power voltage VDD is written into the first pole of the driving transistor TD. In the black insertion stage, since the light emitting module 140 does not emit light because the turn-off control signal is provided to the light emitting control module 160, the pixel circuit resumes normal display when a subsequent display frame is displayed. Therefore, no matter what the data voltage corresponding to the previous display frame is, the data voltage corresponding to the black insertion gray scale is written into the gate of the driving transistor TD in the black insertion stage between two adjacent display frames, so that when the picture of the next display frame is displayed, the data voltage corresponding to the black insertion gray scale is written into the gate of the driving transistor TD, and further, when the pictures with different gray scales are switched, the phenomenon of image sticking caused by the inconsistent offset characteristics of the driving transistor TD due to the hysteresis effect of the driving transistor TD is reduced.

According to the technical scheme provided by the embodiment of the invention, the gray scale data of the pixel circuit in two adjacent display frames are obtained, the data voltage corresponding to the black insertion gray scale is calculated according to the gray scale data corresponding to at least the previous display frame in the two adjacent display frames, the data voltage corresponding to the black insertion gray scale is written into the grid electrode of the driving transistor of the pixel circuit in the black insertion stage between the two adjacent display frames, and the first power supply voltage is written into the first pole of the driving transistor, namely, the bias voltage is applied to the driving transistor after the previous display frame in the two adjacent display frames displays the picture, so that the hysteresis effect of the driving transistor is reset, the hysteresis effect caused by the change of the data voltage written into the grid electrode of the driving transistor in the switching of different gray scale pictures is reduced, and the problem of image sticking can be improved. In addition, when writing the data voltage corresponding to the black insertion gray scale into the gate of the driving transistor of the pixel circuit and writing the first power voltage into the first pole of the driving transistor, the turn-off control signal is provided to the light-emitting control module 160, so that the light-emitting module 140 is in a non-light-emitting state, and the adverse effect on the display effect caused by the lighting of the light-emitting module during the black insertion stage is avoided.

Fig. 4 is a flowchart of another driving method for a pixel circuit according to an embodiment of the present invention, where the driving method is also applicable to the pixel circuit shown in fig. 3, and on the basis of the foregoing technical solution, referring to fig. 4, the driving method for a pixel circuit according to an embodiment of the present invention includes:

s210, acquiring gray scale data of the pixel circuit in two adjacent display frames, wherein the gray scale data comprises display gray scales and corresponding data voltages; this step is the same as the process of S110 in the above embodiment, and is not described herein again.

S220, calculating the black insertion gray scale according to the gray scale data corresponding to the pixel circuit in the previous display frame in the two adjacent display frames.

And S230, determining the data voltage corresponding to the black insertion gray scale according to the black insertion gray scale.

Specifically, after the pixel circuit completes the display frame of the previous display frame, a black insertion stage is set before the display of the next display frame, and a data voltage corresponding to the black insertion gray scale is written into the driving transistor TD in the black insertion stage. Therefore, the black insertion gray scale can be calculated according to the display gray scale corresponding to the pixel circuit in the previous display frame in the two adjacent display frames, and then the data voltage corresponding to the black insertion gray scale is calculated according to the black insertion gray scale, wherein the data voltage corresponding to the black insertion gray scale is inversely related to the data voltage corresponding to the pixel circuit in the previous display frame in the two adjacent display frames, and optionally, the black insertion gray scale is equal to the difference value between the maximum gray scale and the display gray scale of the pixel circuit in the previous display frame in the two adjacent display frames. Illustratively, the Gray scale data of the pixel circuit at the nth display frame and the (N + 1) th display frame are obtained, including the display Gray scales of the nth display frame and the (N + 1) th display frame and corresponding data voltages, and the data voltage corresponding to the black insertion Gray scale may be represented as Gray (gn) ═ Gray (Gray max) -Gray (nth display frame), where Gray (gn) is the black insertion Gray scale, Gray (Gray max) is the maximum Gray scale, for example, the maximum Gray scale is 255 Gray scale, and Gray (nth display frame) is the display Gray scale of the nth display frame. After the black insertion gray level is obtained, the Data voltage corresponding to the black insertion gray level can be further determined according to the black insertion gray level, and Data (gn) Data (gray) -Data (nth display frame) can be known from the relationship between the gray level and the Data voltage. For example, when the maximum gray scale is 255 gray scales and the gray scale of the nth frame display frame is 232 gray scales, the black insertion gray scale is 23 gray scales according to the above formula, that is, the data voltage corresponding to the black insertion gray scale is the data voltage corresponding to the 23 gray scale.

S240, writing data voltage corresponding to black insertion gray scale into a grid electrode of a driving transistor of the pixel circuit in a black insertion stage between two adjacent display frames, writing first power voltage into a first pole of the driving transistor, and providing a turn-off control signal for a light-emitting control module in the pixel circuit; this step is the same as the process of S130 in the above embodiment, and is not described herein again.

As an implementable manner of the embodiment of the present invention, fig. 5 is a flowchart of another driving method of the pixel circuit provided in the embodiment of the present invention, the driving method is also applicable to the pixel circuit shown in fig. 3, and on the basis of the above technical solution, referring to fig. 5, the driving method of the pixel circuit provided in the embodiment of the present invention includes:

s310, acquiring gray scale data of the pixel circuit in two adjacent display frames, wherein the gray scale data comprises display gray scales and corresponding data voltages; this step is the same as the process of S110 in the above embodiment, and is not described herein again.

S320, calculating a black insertion gray scale according to gray scale data corresponding to the pixel circuit in the previous display frame and gray scale data corresponding to the pixel circuit in the next display frame; the black insertion gray scale is inversely related to the gray scale of the pixel circuit in the previous display frame in the two adjacent display frames, and the black insertion gray scale is positively related to the gray scale of the pixel circuit in the next display frame in the two adjacent display frames.

S330, determining the data voltage corresponding to the black insertion gray scale according to the black insertion gray scale.

Specifically, since the driving transistor TD has a hysteresis effect, the hysteresis of the driving transistor TD after displaying a previous display frame can be reset, and the driving transistor TD is driven to reduce the influence of the hysteresis effect of the driving transistor TD on a next display frame. Therefore, the black insertion gray scale can be simultaneously associated with the display gray scale of the previous display frame and the display gray scale of the next display frame in the two adjacent display frames, the black insertion gray scale is inversely related to the gray scale of the pixel circuit in the previous display frame in the two adjacent display frames, and the black insertion gray scale is positively related to the gray scale of the pixel circuit in the next display frame in the two adjacent display frames. Optionally, in the technical solution provided in the embodiment of the present invention, a difference between a display Gray level of a next display frame and a display Gray level of a previous display frame in two adjacent display frames with a black insertion Gray level equal to 2 times is Gray (gn) ═ 2 Gray (N +1 th display frame) -Gray (nth display frame), where Gray (gn) is the black insertion Gray level. After the black insertion gray scale is obtained, the Data voltage corresponding to the black insertion gray scale can be further determined from the black insertion gray scale, and Data (gn) 2 × Data (N +1 th display frame) -Data (N th display frame) can be known from the relationship between the gray scale and the Data voltage. Illustratively, the gray scale data of the nth display frame and the (N + 1) th display frame are acquired, wherein the gray scale data of the nth display frame and the (N + 1) th display frame include data voltages corresponding to a display gray scale of the nth display frame and a display gray scale of the nth display frame, and data voltages corresponding to a display gray scale of the (N + 1) th display frame and a display gray scale of the (N + 1) th display frame, for example, the display gray scale of the nth display frame is 46 gray scales, and the display gray scale of the (N + 1) th display frame is 104 gray scales. Then, according to the above formula, the black insertion gray level is 162 gray levels, and the data voltage corresponding to the black insertion gray level is calculated according to the black insertion gray level.

Optionally, if the black insertion gray scale is greater than the maximum gray scale, the data voltage corresponding to the black insertion gray scale is set as the data voltage corresponding to the maximum gray scale. Specifically, the maximum gray scale may be 255 gray scales. After Gray scale data of two adjacent display frames of the pixel circuit is acquired, when the black insertion Gray scale is calculated to be larger than 255 Gray scale according to a formula Gray (gn) 2 × Gray (N +1 th display frame) -Gray (nth display frame), the black insertion Gray scale is set to be 255 Gray scale, and meanwhile, the data voltage corresponding to the black insertion Gray scale is set to be the data voltage corresponding to the 255 Gray scale, so that the effectiveness of the black insertion Gray scale is improved. And if the black insertion gray scale is smaller than the minimum gray scale, setting the data voltage corresponding to the black insertion gray scale as the data voltage corresponding to the minimum gray scale. Wherein, the minimum gray scale can be 0 gray scale. After Gray scale data of two adjacent display frames of the pixel circuit is acquired, when the black insertion Gray scale is calculated to be less than 0 Gray scale according to the formula Gray (gn) 2 × Gray (N +1 th display frame) -Gray (nth display frame), the black insertion Gray scale is set to be 0 Gray scale, and the data voltage corresponding to the black insertion Gray scale is set to be the data voltage corresponding to the 0 Gray scale, so that the validity of the black insertion Gray scale can be improved. If the black insertion Gray level is greater than or equal to the minimum Gray level and less than or equal to the maximum Gray level, the data voltage corresponding to the black insertion Gray level may be calculated according to the formula Gray (gn) 2 × Gray (N +1 th display frame) -Gray (N th display frame).

S340, writing data voltage corresponding to black insertion gray scale into a grid electrode of a driving transistor of the pixel circuit in a black insertion stage between two adjacent display frames, writing first power supply voltage into a first pole of the driving transistor, and providing a turn-off control signal for a light-emitting control module in the pixel circuit; this step is the same as the process of S130 in the above embodiment, and is not described herein again.

According to the technical scheme provided by the embodiment of the invention, the data voltage corresponding to the black insertion gray scale can be calculated according to the gray scale data of the pixel circuit in the previous display frame in the two adjacent display frames, or the data voltage corresponding to the black insertion gray scale can be calculated according to the gray scale data of the pixel circuit in the previous display frame and the gray scale data of the pixel circuit in the next display frame in the two adjacent display frames. In an actual application process, any one of the calculation methods may be selected according to actual requirements to calculate the data voltage corresponding to the black insertion gray scale, which is not limited in this embodiment of the present invention.

Fig. 6 is a timing diagram of a black insertion method according to an embodiment of the present invention. Referring to fig. 3 and fig. 6, the pixel circuit shown in fig. 3 is combined with fig. 6 to explain the specific operation principle of the driving method of the pixel circuit provided by the embodiment of the present invention.

When the display device drives the pixel circuit to work at a certain frequency, the pixel circuit displays the picture frame by frame. In the data writing stage, the data voltage writing module 120 and the compensation module 150 are controlled to be turned on according to the first scanning signal output by the first scanning signal terminal Scan1, the data voltage Vdata is written to the gate of the driving transistor TD and one end of the storage module 130 connected to the gate of the driving transistor TD through the data voltage writing module 120, the driving transistor TD and the compensation module 150, the process is also a process of charging the storage module 130, and after the charging is completed, the data voltage Vdata is stored in the storage module 130. In the light emitting stage, the light emitting control module 160 is controlled to be turned on according to the light emitting control signal EM, so that the driving transistor TD generates a driving signal, such as a current signal, according to the voltage written in the gate thereof, and the driving transistor TD generates a driving current to drive the light emitting module 140 to emit light, so that the pixel circuit completes the display of the previous frame. A black insertion stage is arranged between two adjacent display frames, and the time of the black insertion stage is less than the time of one frame of the display frames, namely the time of the black insertion stage is less than the time required for displaying one frame of picture. And acquiring gray scale data of two adjacent display frames, controlling the data voltage writing module 120 to be switched on in a black insertion stage, and writing data voltage corresponding to the black insertion gray scale into the grid electrode of the driving transistor TD through the data voltage writing module 120, the driving transistor TD and the compensation module 150, wherein the data voltage corresponding to the black insertion gray scale can be calculated according to the gray scale data corresponding to at least one previous display frame in the two adjacent display frames. After writing the data voltage corresponding to the black inserted gray scale into the gate of the driving transistor TD, the first voltage writing module 170 is controlled to be turned on, and the first power voltage VDD is written into the first pole of the driving transistor TD. In the black insertion stage, since the light emitting module 140 does not emit light because the turn-off control signal is provided to the light emitting control module 160, the pixel circuit resumes normal display when a subsequent display frame is displayed. When the next frame of picture is displayed, the gate of the driving transistor TD is written with the data voltage corresponding to the black inserted gray scale, so that the image sticking phenomenon caused by the inconsistent offset characteristics of the driving transistor TD due to the hysteresis effect of the driving transistor TD is reduced when the next frame of picture is switched.

Optionally, a black insertion frame is included between two adjacent display frames. Fig. 7 is a flowchart of another driving method for a pixel circuit according to an embodiment of the present invention, and referring to fig. 7, based on the above technical solutions, the technical solution according to the embodiment of the present invention includes:

s410, acquiring gray scale data of the pixel circuit in two adjacent display frames, wherein the gray scale data comprises display gray scales and corresponding data voltages; this step is the same as the process of S110 in the above embodiment, and is not described herein again.

S420, calculating data voltage corresponding to the black insertion gray scale according to gray scale data corresponding to at least one previous display frame in the two adjacent display frames; this step is the same as the process of S120 in the above embodiment, and is not described herein again.

S430, writing data voltage corresponding to black insertion gray scale into a grid electrode of a driving transistor of the pixel circuit in a black insertion frame, writing first power voltage into a first pole of the driving transistor, and providing a turn-off control signal for a light-emitting control module in the pixel circuit; the black frame insertion time is equal to the display frame time.

Specifically, fig. 8 is a timing diagram of another black insertion method according to an embodiment of the present invention, and referring to fig. 8, a black insertion frame is included between two adjacent display frames (an nth display frame and an N +1 th display frame), and a time of the black insertion frame is equal to a time of the display frame, that is, the black insertion frame is displayed at a frequency 2 times. For example, the driving scan frequency of the black insertion stage is not set to be 60Hz, the black insertion stage is set between two adjacent display frames, the black insertion stage includes the black insertion frame, the time of the black insertion frame is equal to the time of the display frame, i.e. the frame with the 60Hz frequency is displayed at the 120Hz frequency, the frame scan frequency is increased, and thus the problem of image sticking caused by the hysteresis effect of the driving transistor is reduced. The working principle is the same as that of the black insertion method in which the black insertion period is shorter than one frame time of the display frame, and the description is omitted here.

As another optional implementation manner of the embodiment of the present invention, the light-emitting control module 160 in the pixel circuit shown in fig. 3 includes a first light-emitting control unit 161 and a second light-emitting control unit 162, where the first light-emitting control unit 161, the driving transistor TD, the second light-emitting control unit 162, and the light-emitting module 140 are connected in series between a first power terminal and a second power terminal in sequence; the pixel circuit further includes a first voltage writing module 170, a data voltage writing module 120, and a compensation module 150, wherein the first voltage writing module 170 is connected in parallel with the first light emitting control unit 161. Fig. 9 is a flowchart of another driving method for a pixel circuit according to an embodiment of the present invention, where the driving method is also applicable to the pixel circuit shown in fig. 3, and referring to fig. 9, the driving method for a pixel circuit according to the embodiment of the present invention includes:

s510, acquiring gray scale data of the pixel circuit in two adjacent display frames, wherein the gray scale data comprises display gray scales and corresponding data voltages; this step is the same as the process of S110 in the above embodiment, and is not described herein again.

S520, calculating data voltage corresponding to the black insertion gray scale according to gray scale data corresponding to at least one previous display frame in the two adjacent display frames; this step is the same as the process of S120 in the above embodiment, and is not described herein again.

S530, in a first sub-phase of the black insertion phase, providing a conducting control signal to the data voltage writing module and the compensation module to write a data voltage corresponding to the black insertion gray scale to the gate of the driving transistor of the pixel circuit.

Specifically, the first sub-stage of the black insertion stage is a stage of writing a data voltage corresponding to a black insertion gray level into the gate of the driving transistor TD. At this stage, the data voltage writing module 120 and the compensation module 150 are turned on by the first Scan signal output from the first Scan signal terminal Scan1, and the data voltage corresponding to the black insertion gray scale is written to the gate of the driving transistor TD through the data voltage writing module 120, the driving transistor TD and the compensation module 150, so as to perform black insertion processing between two adjacent display frames. The Data voltage corresponding to the black insertion gray scale may be calculated from the Data voltage corresponding to the pixel circuit in the previous display frame in the two adjacent display frames [ Data (gn) ═ Data (gray) Data (nth display frame) ], or may be calculated from the gray scale voltage corresponding to the pixel circuit in the previous display frame in the two adjacent display frames and the gray scale voltage corresponding to the pixel circuit in the next display frame [ Data (gn) ═ 2 Data (N +1 th display frame) -Data (nth display frame) ].

And S540, in a second sub-stage of the black insertion stage, providing a conduction control signal to the first voltage writing module so that the first power voltage of the first power end is written into the first electrode of the driving transistor.

Specifically, the second sub-phase of the black insertion phase is a phase of applying the first power voltage VDD to the first electrode of the driving transistor TD. In the second sub-phase of the black insertion phase, the first Scan signal output by the first Scan signal terminal Scan1 controls the data voltage write module 120 and the compensation module 150 to turn off, the control signal terminal EN provides the turn-on control signal to the first electrode voltage write module 170, the first power voltage VDD is applied to the first electrode of the driving transistor TD through the first electrode voltage write module 170, and the storage module 130 can maintain the electric potential of the gate of the driving transistor TD, so that a voltage difference is formed between the gate and the first electrode of the driving transistor TD to reset the hysteresis of the driving transistor, thereby reducing the hysteresis effect caused by the change of the data voltage written into the gate of the driving transistor when the different gray-scale frames are switched, and further improving the image sticking problem.

And S550, providing a turn-off control signal to the first light-emitting control unit and the second light-emitting control unit in a black insertion stage.

Specifically, in the black insertion stage, a turn-off control signal is provided to the first light-emitting control unit 161 and the second light-emitting control unit 162 to ensure that the light-emitting module 140 is in a non-light-emitting state, so as to avoid an adverse effect on a display effect caused by the lighting stealing of the light-emitting module 140 in the black insertion stage.

The embodiment of the invention also provides a pixel circuit which can be driven by the driving method of the pixel circuit provided by any technical scheme of the invention. Fig. 10 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention, and referring to fig. 10, the pixel circuit according to the embodiment of the present invention includes: the driving transistor TD, the data voltage writing module 120, the storage module 130, the compensation module 150, the light emitting module 140, the first voltage writing module 170, and the light emitting control module 160; the control terminal of the data voltage writing module 120 is connected to the first Scan signal input terminal Scan1, the first terminal of the data voltage writing module 120 is connected to the data voltage input terminal Vdata, the second terminal of the data voltage writing module 120 is connected to the first pole of the driving transistor TD, the gate of the driving transistor TD is connected to the first terminal of the compensation module 150, the second terminal of the compensation module 150 is connected to the second pole of the driving transistor TD, and the control terminal of the compensation module 150 is connected to the first Scan signal input terminal Scan 1; the memory module 130 is connected between the first power terminal and the gate of the driving transistor TD; the light emission control module 160 includes a first light emission control unit 161 and a second light emission control unit 162, a control end of the first light emission control unit 161 and a control end of the second light emission control unit 162 are both connected to the light emission control signal input end EM, a first end of the first light emission control unit 161 is connected to a first power supply end, a second end of the first light emission control unit 161 is connected to a first electrode of the driving transistor TD, a first end of the second light emission control unit 162 is connected to a second electrode of the driving transistor TD, a second end of the second light emission control unit 162 is connected to an anode of the light emission module 140, and a cathode of the light emission module 140 is connected to a second power supply end; a control end of the first pole voltage writing module 170 is connected to the voltage control signal input end EN, a first end of the first pole voltage writing module 170 is connected to a first end of the first light emitting control unit 161, and a second end of the first pole voltage writing module 170 is connected to a second end of the first light emitting control unit 161; the data voltage writing module 120 and the compensation module 150 are configured to write a data voltage corresponding to a black insertion gray scale to the gate of the driving transistor TD during a black insertion period between two adjacent display frames; the first voltage writing module 170 is configured to write the first power voltage VDD to the first pole of the driving transistor TD during the black insertion phase; the light emission control module 160 is used to turn off during the black insertion phase.

With reference to fig. 10, the pixel circuit according to the embodiment of the present invention further includes a first initialization module 180 and a second initialization module 190, a control end of the first initialization module 180 and a control end of the second initialization module are both connected to the second scan signal end, a first end of the first initialization module 180 inputs a reference voltage Vref, and a second end of the first initialization module 180 is connected to the gate of the driving transistor TD; a first terminal of the second initialization module 190 inputs the reference voltage Vref, and a second terminal of the second initialization module 190 is connected to the anode of the light emitting module 140. The data voltage writing module 120 includes a first transistor T1, the compensation module includes a second transistor T2, the first light emitting control unit 161 includes a third transistor T3, the second light emitting control unit 162 includes a fourth transistor T4, the first voltage writing module 170 includes a fifth transistor T5, the first initialization module 180 includes a sixth transistor T6, the second initialization module 190 includes a seventh transistor T7, the storage module 130 includes a storage capacitor Cs, and the light emitting module 140 includes a light emitting diode D1.

Fig. 11 is a driving timing diagram of a pixel circuit according to an embodiment of the invention, where the driving timing diagram can be applied to the pixel circuit shown in fig. 10. Taking the pixel circuit shown in fig. 10 as an example, the working principle of the pixel circuit provided in the embodiment of the present invention is specifically described with reference to fig. 11.

The pixel circuit provided by the embodiment of the invention comprises an initialization stage t1, a data writing stage t2, a light-emitting stage t3 and a black insertion stage t 4.

In the initialization stage t1, a turn-off control signal is input to the light-emitting control signal input terminal, and the first light-emitting control unit 161 and the second light-emitting control unit 162 are turned off; the first Scan signal terminal Scan1 inputs a turn-off control signal, and the data voltage writing module 120 and the compensation module 150 are turned off; the second Scan signal terminal Scan2 inputs a turn-on control signal, and the first initialization block 180 and the second initialization block 190 are turned on. The reference voltage Vref is written to the gate of the driving transistor TD through the first initialization module 180, and the potential of the gate of the driving transistor TD is initialized to the potential of the reference voltage Vref. The reference voltage Vref is also written to the anode of the light emitting module 140 through the second initialization module 190, and the potential of the anode of the light emitting module 140 is initialized to the potential of the reference voltage Vref.

In the data writing phase t2, the light-emitting control signal input end inputs the turn-off control signal, and the first light-emitting control unit 161 and the second light-emitting control unit 162 are turned off; the first Scan signal terminal Scan1 inputs a turn-on control signal, and the data voltage writing module 120 and the compensation module 150 are turned on; the second Scan signal terminal Scan2 inputs a shutdown control signal, and the first initialization block 180 and the second initialization block 190 are shut down. The data voltage Vdata input from the data voltage input terminal is written to the gate of the driving transistor TD through the data voltage writing module 120, the driving transistor TD and the compensation module 150, and the compensation of the threshold voltage of the driving transistor TD is realized through the compensation module 150. At this time, the memory module 130 maintains the gate potential of the driving transistor TD at Vdata- | Vth |, where Vth is the threshold voltage of the driving transistor TD.

In the light emitting period t3, the light emitting control signal input end inputs the on control signal, and the first light emitting control unit 161 and the second light emitting control unit 162 are turned on; the first Scan signal terminal Scan1 inputs a turn-off control signal, and the data voltage writing module 120 and the compensation module 150 are turned off; the second Scan signal terminal Scan2 inputs a shutdown control signal, and the first initialization block 180 and the second initialization block 190 are shut down. The first power voltage VDD is written to the anode of the light emitting module 140 through the first light emitting control unit 161, the driving transistor TD and the second light emitting control unit 162, the second power terminal inputs the second power voltage VSS to the cathode of the light emitting module 140, and the driving transistor TD generates a driving current according to the data voltage of the gate thereof to drive the light emitting module to emit light, so as to complete the display of the previous display frame.

In an initialization sub-phase t40 of the black insertion phase t4, a turn-off control signal is input to the light-emitting control signal input terminal, and the first light-emitting control unit 161 and the second light-emitting control unit 162 are turned off; the first Scan signal terminal Scan1 inputs a turn-off control signal, and the data voltage writing module 120 and the compensation module 150 are turned off; the second Scan signal terminal Scan2 inputs a turn-on control signal, and the first initialization block 180 and the second initialization block 190 are turned on. The reference voltage Vref is written to the gate of the driving transistor TD through the first initialization module 180, and the potential of the gate of the driving transistor TD is initialized to the potential of the reference voltage Vref. The reference voltage Vref is also written to the anode of the light emitting module 140 through the second initialization module 190, and the potential of the anode of the light emitting module 140 is initialized to the potential of the reference voltage Vref.

In the first sub-phase t41 of the black insertion phase t4, the light-emitting control signal input end inputs a turn-off control signal, and the first light-emitting control unit 161 and the second light-emitting control unit 162 are turned off; the second Scan signal terminal Scan2 inputs an off control signal, the first initialization block 180 and the second initialization block 190 are turned off, the first Scan signal terminal Scan1 inputs an on control signal, and the data voltage writing block 120 and the compensation block 150 are turned on. The data voltage corresponding to the black inserted gray level is written into the gate of the driving transistor TD and the memory module 130 through the data voltage writing module 120, the driving transistor TD and the compensation module 150.

In a second sub-phase t42 of the black insertion phase t4, the light-emitting control signal input end inputs a turn-off control signal, and the first light-emitting control unit 161 and the second light-emitting control unit 162 are turned off; the second Scan signal terminal Scan2 inputs an off control signal, the first initialization module 180 and the second initialization module 190 are turned off, the first Scan signal terminal Scan1 inputs an off control signal, the data voltage write module 120 and the compensation module 150 are turned off, the control signal terminal EN provides an on control signal to the first electrode voltage write module 170, the first power voltage VDD is applied to the first electrode of the driving transistor TD through the first electrode voltage write module 170, and the storage module 130 can maintain the potential of the gate of the driving transistor TD, so a voltage difference is formed between the gate and the first electrode of the driving transistor TD to reset the hysteresis of the driving transistor, thereby reducing the hysteresis effect caused by the change of the data voltage written into the gate of the driving transistor during the switching of different gray-scale pictures, and further improving the problem of image sticking.

The technical scheme provided by the embodiment of the invention includes that gray scale data of a pixel circuit in two adjacent display frames are obtained, data voltage corresponding to black insertion gray scale is calculated according to gray scale data corresponding to at least one previous display frame in the two adjacent display frames, the data voltage corresponding to the black insertion gray scale is written into a grid electrode of a driving transistor of the pixel circuit in a black insertion stage between the two adjacent display frames, a first power supply voltage is written into a first electrode of the driving transistor, namely, the data voltage corresponding to the black insertion gray scale is applied to the grid electrode of the driving transistor after a previous display frame in the two adjacent display frames displays a picture, a conduction control signal is provided to a first electrode voltage writing module, the first power supply voltage is applied to the first electrode of the driving transistor through the first electrode voltage writing module to reset hysteresis of the driving transistor, and therefore hysteresis effect caused by change of the data voltage written into the grid electrode of the driving transistor when different gray scale pictures are switched is reduced Thereby improving the problem of afterimage. In addition, when writing the data voltage corresponding to the black insertion gray scale into the gate of the driving transistor of the pixel circuit and writing the first power supply voltage into the first pole of the driving transistor, a turn-off control signal is provided for the light-emitting control module, so that the light-emitting module is in a non-light-emitting state, and the adverse effect on the display effect caused by the fact that the light-emitting module is stolen to be bright in the black insertion stage is avoided.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method of driving a pixel circuit, comprising:

writing data voltage corresponding to the black insertion gray scale into a grid electrode of a driving transistor of the pixel circuit in a black insertion stage between two adjacent display frames, writing first power supply voltage into a first pole of the driving transistor, and providing a turn-off control signal for a light-emitting control module in the pixel circuit;

the black insertion gray scale is equal to the difference value between the maximum gray scale and the display gray scale of the pixel circuit in the previous display frame in the two adjacent display frames; or the black insertion gray scale is equal to 2 times of the difference value between the display gray scale of the next display frame and the display gray scale of the previous display frame in the two adjacent display frames.

2. The method according to claim 1, wherein the data voltage corresponding to the black inserted gray level is inversely related to the data voltage corresponding to the pixel circuit in the previous frame in the two adjacent display frames.

3. The method for driving a pixel circuit according to claim 2, wherein the calculating a data voltage corresponding to a black insertion gray level according to gray level data corresponding to at least a previous display frame of the two adjacent display frames comprises:

the black insertion gray scale is equal to the difference value between the maximum gray scale and the display gray scale of the pixel circuit in the previous display frame in the two adjacent display frames;

4. The method for driving a pixel circuit according to claim 1, wherein the calculating a data voltage corresponding to a black insertion gray level according to gray level data corresponding to at least a previous display frame of the two adjacent display frames comprises:

calculating the black insertion gray scale according to gray scale data corresponding to the pixel circuit in the previous display frame and gray scale data corresponding to the pixel circuit in the next display frame in the two adjacent display frames; the black insertion gray scale is inversely related to the gray scale of the pixel circuit in the previous display frame in the two adjacent display frames, and the black insertion gray scale is positively related to the gray scale of the pixel circuit in the next display frame in the two adjacent display frames; the black insertion gray scale is equal to 2 times of the difference value between the display gray scale of the next display frame and the display gray scale of the previous display frame in the two adjacent display frames;

5. The method for driving a pixel circuit according to claim 4, wherein the calculating a data voltage corresponding to a black insertion gray level according to gray level data corresponding to at least a previous display frame of the two adjacent display frames comprises:

6. The method for driving a pixel circuit according to claim 1, wherein the black insertion period is shorter than one frame time of the display frame.

7. The method according to claim 1, wherein a black insertion frame is included between two adjacent display frames, and during a black insertion period between the two adjacent display frames, writing a data voltage corresponding to the black insertion gray scale to a gate of a driving transistor of the pixel circuit, writing a first power supply voltage to a first pole of the driving transistor, and providing an off control signal to a light emission control module in the pixel circuit includes:

the black insertion frame is equal in time to the display frame.

8. The method according to claim 1, wherein the light emission control block comprises a first light emission control unit and a second light emission control unit, the first light emission control unit, the driving transistor, the second light emission control unit, and the light emission module being connected in series in this order between a first power supply terminal and a second power supply terminal; the pixel circuit further comprises a first electrode voltage writing module, a data voltage writing module and a compensation module, wherein the first electrode voltage writing module is connected with the first light-emitting control unit in parallel;

9. A pixel circuit driven by the driving method of the pixel circuit according to any one of claims 1 to 8; the pixel circuit comprises a driving transistor, a data voltage writing module, a storage module, a compensation module, a light emitting module, a first electrode voltage writing module and a light emitting control module;