CN116312421A - Pixel circuit, driving method thereof and display panel - Google Patents

Abstract

The present application discloses a pixel circuit, a driving method thereof, and a display panel. The pixel circuit includes: a driving module, the first end of which is connected to a first voltage source; a storage capacitor module, whose first end and second end are respectively connected to the first The voltage source and the control terminal of the driving module; the data writing module, its second terminal and the third terminal are respectively connected to the first terminal and the second scanning line of the driving module; the pre-writing module, its first terminal, the second terminal, The third end and the fourth end are respectively connected to the data line, the first end of the data writing module, the first scanning line and the first end of the storage capacitor module, so as to provide the data voltage on the data line to the data writing module The first end of the light emitting module and the first end of the storage capacitor module; the light emitting module, the first end of the light emitting module is connected to the second end of the driving module, and the second end of the light emitting module is connected to the second voltage source. Through the above method, the pixel circuit of the present application not only ensures a high-refresh display function, but also ensures a good compensation effect.

Description

A pixel circuit, its driving method, and a display panel

technical field

The present application relates to the technical field of display panels, in particular to a pixel circuit, a driving method thereof, and a display panel.

Background technique

Nowadays, with the continuous development of display technology, people's demand for improving the refresh rate of the screen is also increasing, but the pixel circuit in the traditional display panel usually uses a 7T1C (7 transistors and 1 capacitor) circuit, and because of this The charging capacitor Cst in the 7T1C circuit is usually fixed, and its charging time is limited. Therefore, when the 7T1C circuit performs Vdata (data voltage signal) writing compensation, the high-refresh display downlink time is shortened, and there is a high-frequency display The problem of undercompensation.

Contents of the invention

The main technical problem to be solved by the present application is to provide a pixel circuit and its driving method, and a display panel, which can solve the problem of insufficient compensation in the high-frequency display of the pixel circuit in the prior art.

In order to solve the above technical problems, a technical solution adopted by the present application is to provide a pixel circuit, wherein the pixel circuit includes: a driving module, the first end of which is connected to the first voltage source; a storage capacitor module, the storage capacitor module The first end of the storage capacitor module is connected to the first voltage source, the second end of the storage capacitor module is connected to the control end of the drive module; the data write module, the second end of the data write module is connected to the first end of the drive module, and the data write module The third end is connected to the second scanning line; the pre-writing module, the first end of the pre-writing module is connected to the data line, the second end of the pre-writing module is connected to the first end of the data writing module, and the second end of the pre-writing module is connected to the first end of the data writing module. The three terminals are connected to the first scanning line, and the fourth terminal of the pre-writing module is connected to the first terminal of the storage capacitor module, so as to provide the data voltage on the data line to the first terminal of the data writing module and the first terminal of the storage capacitor module. The first end; the light emitting module, the first end of the light emitting module is connected to the second end of the driving module, and the second end of the light emitting module is connected to the second voltage source.

Wherein, the pre-writing module includes a pre-writing transistor and a pre-writing capacitor, the first end of the pre-writing transistor is connected to the data line, and the second end of the pre-writing transistor is connected to the first end of the pre-writing capacitor and the data writing The first end of the module, the third end of the pre-writing transistor are connected to the first scan line, and the second end of the pre-writing capacitor is connected to the first end of the storage capacitor module.

Wherein, the pixel circuit further includes a compensation module, the first terminal of the compensation module is connected to the control terminal of the driving module, the second terminal of the compensation module is connected to the second terminal of the driving module, and the third terminal of the compensation module is connected to the second scanning line for The control terminal of the control drive module communicates with the second terminal of the drive module.

Wherein, the compensation module is a double-gate transistor, including a first compensation transistor and a second compensation transistor, the first terminal of the first compensation transistor is connected to the control terminal of the driving module, and the second terminal of the first compensation transistor is connected to the second terminal of the second compensation transistor. One terminal, the third terminal of the first compensation transistor is connected to the third terminal of the second compensation transistor and the second scan line, and the second terminal of the second compensation transistor is connected to the second terminal of the driving module.

Wherein, the pixel circuit also includes a first initialization module and a second initialization module, the first terminal of the first initialization module is connected to the control terminal of the driving module, and the second terminal of the first initialization module is connected to the first terminal of the second initialization module and the reference Voltage line, the third end of the first initialization module is connected to the first scan line, the second end of the second initialization module is connected to the first end of the light emitting module, and the third end of the second initialization module is connected to the first scan line, for The initial voltage is controlled to be written into the second terminal of the storage capacitor module and the first terminal of the light emitting module.

Wherein, the first initialization module is a double-gate transistor, including a first initialization transistor and a second initialization transistor, the first terminal of the first initialization transistor is connected to the control terminal of the driving module, and the second terminal of the first initialization transistor is connected to the second initialization transistor The first terminal of the first initialization transistor is connected to the third terminal of the second initialization transistor and the first scan line, and the second terminal of the second initialization transistor is connected to the first terminal of the second initialization module and the reference voltage line.

Wherein, the pixel circuit further includes a first light emission control module and a second light emission control module, the first end of the first light emission control module is connected to the first voltage source, the second end of the first light emission control module is connected to the first end of the driving module, The third terminal of the first lighting control module is connected to the emission signal line for controlling the connection between the first voltage source and the first terminal of the driving module; the first terminal of the second lighting control module is connected to the second terminal of the driving module , the second terminal of the second lighting control module is connected to the first terminal of the lighting module, and the third terminal of the second lighting control module is connected to the emission signal line, so as to control the connection between the second terminal of the driving module and the first terminal of the lighting module connection between.

In order to solve the above technical problems, another technical solution adopted by the present application is to provide a driving method of a pixel circuit, which is applied to the above-mentioned pixel circuit, wherein the driving method includes: in the data writing phase, controlling the pre-writing The input transistor is turned on to transmit the data voltage to the first end of the data writing module and the first end of the pre-writing capacitor, and the pre-writing capacitor is coupled to the first end of the storage capacitor module to write the data voltage; stage, control the data writing module and the compensation module to be turned on, and charge the control terminal of the driving module to compensate the threshold voltage of the driving module; connected, so that the driving module drives the light emitting module to emit light according to the voltages of the control terminal and the second terminal.

Wherein, the data writing phase also includes: controlling the first initialization module and the second initialization module to be turned on, so as to write the initial voltage into the second terminal of the storage capacitor module and the first terminal of the light emitting module.

In order to solve the above technical problems, another technical solution adopted by the present application is to provide a display panel, wherein the display panel includes a connected drive circuit and a pixel circuit; wherein the pixel circuit is as described in any one of the above pixel circuit.

The beneficial effects of the present application are: different from the prior art, the first terminal of the driving module in the pixel circuit provided by the present application is connected to the first voltage source, and the first terminal and the second terminal of the storage capacitor module are respectively connected to the first voltage source and the control terminal of the driving module, the second terminal and the third terminal of the data writing module are respectively connected to the first terminal and the second scanning line of the driving module, and the first terminal, the second terminal and the third terminal of the pre-writing module and the fourth terminal are respectively connected to the data line, the first terminal of the data writing module, the first scanning line and the first terminal of the storage capacitor module, and the first terminal and the second terminal of the light emitting module are respectively connected to the second terminal and the second terminal of the driving module. The second voltage source, wherein the pre-writing module is used to provide the data voltage on the data line to the first end of the data writing module and the first end of the storage capacitor module, so as to write and drive the data voltage The compensation stage of the threshold voltage of the module is separated, so that the compensation effect can be effectively improved, and the row writing time can be significantly shortened to ensure the high-refresh display function.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work, in which:

FIG. 1 is a schematic structural diagram of the first embodiment of the pixel circuit of the present application;

2 is a schematic structural diagram of the second embodiment of the pixel circuit of the present application;

FIG. 3 is a schematic structural diagram of a specific embodiment of the pixel circuit in FIG. 2;

FIG. 4 is a schematic timing diagram of control signals corresponding to the driving method of the pixel circuit in FIG. 3;

Fig. 5 is a schematic diagram of the simulation results of the pixel circuit grayscale expansion in Fig. 3;

FIG. 6 is a schematic flowchart of an embodiment of a method for driving a pixel circuit of the present application;

FIG. 7 is a schematic structural diagram of an embodiment of a display panel of the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

The terms "first", "second", and "third" in this application are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, features defined as "first", "second", and "third" may explicitly or implicitly include at least one of these features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined. All directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative positional relationship between the various components in a certain posture (as shown in the drawings) , sports conditions, etc., if the specific posture changes, the directional indication also changes accordingly. Furthermore, the terms "include" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes For other steps or units inherent in these processes, methods, products or apparatuses.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

The application will be described in detail below in conjunction with the accompanying drawings and embodiments.

Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of a first embodiment of a pixel circuit of the present application. In this embodiment, the pixel circuit 10 includes: a driving module 11 , a storage capacitor module 12 , a data writing module 13 , a pre-writing module 14 and a light emitting module 15 .

It should be noted that, in the field of display technology, a display panel usually provides a constant current source correspondingly output from its system power supply to the pixel circuit 10 to continuously provide current to the light-emitting module 15 in the pixel circuit 10 . Wherein, the magnitude of the current is specifically adjusted and controlled by the control terminal voltage of the driving module 11 in the pixel circuit 10, and the control terminal voltage of the driving module 11 is correspondingly provided by the driving circuit of the display panel to the pixel circuit 10. Write to store in the storage capacitor module 12 in the pixel circuit 10, so as to ensure that the light emitting module 15 can continuously emit light in one scanning period of the driving circuit, so as to realize corresponding image display.

Specifically, the first end of the driving module 11 is correspondingly connected to the first voltage source 101 provided by the system power supply, and the first voltage source 101 is specifically a constant current source.

The first terminal of the storage capacitor module 12 is also correspondingly connected to the first voltage source, and the second terminal of the storage capacitor module 12 is connected to the control terminal of the driving module 11 .

Further, the second end of the data writing module 13 is connected to the first end of the driving module 11, and the third end of the data writing module 13 is connected to the second scanning line 203 in the corresponding display panel, so as to receive the first The second scan line 203 corresponds to the second scan signal provided.

Wherein, the first end of the pre-writing module 14 is connected to the data line 201 in the display panel for receiving the data voltage provided by the data line 201, and the second end of the pre-writing module 14 is correspondingly connected to the data line 201. The first end of the writing module 13, the fourth end of the pre-writing module 14 is connected to the first end of the storage capacitor module 12, and the third end of the pre-writing module 14 is connected to the first scan line 202 for receiving The first scan line 202 corresponds to the provided first scan signal, and when triggered to be turned on under the action of the first scan signal, the data voltage on the data line 201 is provided to the first terminal and the first terminal of the data writing module 13. The first end of the storage capacitor module 12 .

Still further, the first end of the light emitting module 15 is specifically connected to the second end of the driving module 11, and the second end of the light emitting module 15 is correspondingly connected to the second voltage source 102 provided by the system power supply, so that the driving In one scan period of the circuit, it can continuously emit light based on the corresponding output voltages provided by the driving module 11 and the second voltage source 102, so as to realize corresponding image display.

It can be understood that the first scan line 202 and the second scan line 203 correspond to the first scan signal and the second scan signal provided to the pre-writing module 14 and the data writing module 13 respectively, and may specifically be in different periods, as shown in the first The first period and the second period respectively trigger the conduction of the pre-writing module 14 and the data writing module 13; and specifically, the first scanning signal triggers the conduction of the pre-writing module 14 in the first period earlier in timing, so that the The data voltage on the data line 201 is provided to the first terminal of the data writing module 13 and the first terminal of the storage capacitor module 12, and then the data voltage is coupled and written into the control terminal of the driving module 11 through the storage capacitor module 12, so as to Writing of the data voltage in the pixel circuit 10 is completed.

And in the second period, the second scanning signal will trigger the data writing module 13 to be turned on, so as to write the data voltage into the first end of the driving module 11, so that the driving can be completed by means of a relatively long second period. Compensation of the threshold voltage of the module 11 to effectively separate the writing of the data voltage from the compensation stage of the threshold voltage of the driving module 11, thereby effectively improving the compensation effect while significantly shortening the row writing time to ensure high refresh display at the same time Function.

Please refer to FIG. 2 . FIG. 2 is a schematic structural diagram of a second embodiment of a pixel circuit of the present application. This embodiment is based on the first embodiment of the pixel circuit provided in this application, and the pre-writing module 24 in the pixel circuit 20 specifically further includes a pre-writing transistor 241 and a pre-writing capacitor 242 .

Specifically, the first end of the pre-writing transistor 241 is connected to the data line 201 for receiving the corresponding data voltage provided by the data line 201, and the second end of the pre-writing transistor 241 is connected to the pre-writing capacitor 242. The first end and the first end of the data writing module 23, the second end of the pre-writing capacitor 242 is connected to the first end of the storage capacitor module 22; and the third end of the pre-writing transistor 241 is connected to the first scanning line 202 , for receiving the first scanning signal correspondingly provided by the first scanning line 202, and providing the data voltage on the data line 201 to the data writing module 23 when the conduction is triggered under the action of the first scanning signal and the first end of the pre-writing capacitor 242, and the data voltage is coupled and written into the storage capacitor module 22 through the pre-writing capacitor 242, and then the data voltage is coupled and written into the storage capacitor module 22 through the storage capacitor module 22. The control terminal of the driving module 21 is used to complete writing of the data voltage in the pixel circuit 20 .

It is understandable that, compared to the traditional 7T1C circuit for Vdata, that is, the writing of the data voltage needs to go through 4 transistors, and the charging impedance is relatively large, so that it is difficult to charge to the predetermined value in a short time. In this embodiment Among them, because the writing of the data voltage only needs to pass through one pre-writing transistor 241, so that the pre-writing capacitor 242 can be fully charged in the first period of time, and then the second period can be extended to realize the threshold voltage. The compensation of the data voltage can be effectively separated from the compensation phase of the threshold voltage, so as to effectively improve the compensation effect and significantly shorten the row writing time.

In one embodiment, the pixel circuit 20 further includes a compensation module 26, the first end of the compensation module 26 is correspondingly connected to the control end of the driving module 21, and the second end of the compensation module 26 is connected to the second end of the driving module 21. end, the third end of the compensation module 26 is correspondingly connected to the second scan line 203 in the display panel, for receiving the second scan signal provided by the second scan line 203 to the third end of the compensation module 26, and at the When the conduction is triggered under the action of the second scanning signal, the control terminal of the driving module 21 is connected with the second terminal of the driving module 21 to compensate the threshold voltage of the driving module 21, so as to avoid instability due to the threshold voltage. As a result, the light-emitting brightness of the light-emitting module 25 changes, and the phenomenon of serious non-uniform light emission occurs.

Further, in a specific embodiment, the compensation module 26 is a double-gate transistor, including a first compensation transistor (not shown in the figure) and a second compensation transistor (not shown in the figure), and the first compensation transistor of the first compensation transistor One terminal is connected to the control terminal of the driving module 21, the second terminal of the first compensation transistor is connected to the first terminal of the second compensation transistor, and the third terminal of the first compensation transistor is connected to the third terminal of the second compensation transistor and the second scanning line 203, the second terminal of the second compensation transistor is connected to the second terminal of the driving module 21, so that the composite connection of the first compensation transistor and the second compensation transistor can reduce the requirement for the driving power of the compensation module 26 to achieve a more stable compensation effect.

In one embodiment, the pixel circuit 20 specifically further includes a first initialization module 271 and a second initialization module 272, and the first terminal of the first initialization module 271 is connected to the control terminal of the driving module 21, and the first terminal of the first initialization module 271 The second terminal is connected to the first terminal of the second initialization module 272 and the reference voltage line 204 in the display panel, so that the first initialization module 271 and the second initialization module 272 can receive the corresponding initial voltage provided by the reference voltage line 204 .

Further, the third end of the first initialization module 271 is connected to the first scanning line 202, the second end of the second initialization module 272 is connected to the first end of the light emitting module 25, and the third end of the second initialization module 272 also corresponds to connected to the first scanning line 202, the first initialization module 271 and the second initialization module 272 are used to receive the first scanning signal correspondingly provided by the first scanning line 202, so as to trigger conduction under the action of the first scanning signal , it is used to write the initial voltage correspondingly provided by the reference voltage line 204 into the second end of the storage capacitor module 22 and the first end of the light emitting module 25, so as to initialize the storage capacitor module 22 and the light emitting module 25 at the same time, even if Reset to clear signal remnants that may have been present from the previous stage.

Further, in a specific embodiment, the first initialization module 271 is a double-gate transistor, including a first initialization transistor (not shown in the figure) and a second initialization transistor (not shown in the figure), the first initialization The first terminal of the transistor is connected to the control terminal of the driving module 21, the second terminal of the first initialization transistor is connected to the first terminal of the second initialization transistor, and the third terminal of the first initialization transistor is connected to the third terminal of the second initialization transistor and the third terminal of the second initialization transistor. A scan line 202, the second terminal of the second initialization transistor is connected to the first terminal of the second initialization module 272 and the reference voltage line 204, so that the first initialization transistor can be reduced by the composite connection of the first initialization transistor and the second initialization transistor. Module 271's requirements on driving power to achieve a more stable initialization effect.

In one embodiment, the pixel circuit 20 specifically further includes a first light emission control module 281 and a second light emission control module 282. The first end of the first light emission control module 281 is connected to the first voltage source 101 correspondingly provided by the system power supply. The second end of a light emission control module 281 is connected to the first end of the driving module 21, and the third end of the first light emission control module 281 is connected to the emission signal line 205 in the display panel, so as to receive the emission signal line 205 corresponding The transmission signal is provided, and the conduction is triggered under the action of the transmission signal, so as to control the communication between the first voltage source 101 and the first terminal of the driving module 21 .

Further, the first end of the second lighting control module 282 is connected to the second end of the driving module 21, the second end of the second lighting control module 282 is connected to the first end of the lighting module 25, and the second lighting control module 282 The third terminal of the transmission signal line 205 is also correspondingly connected to the transmission signal line 205 for receiving the transmission signal correspondingly provided by the transmission signal line 205, and triggers conduction under the action of the transmission signal to control the second terminal of the driving module 21 It is connected with the first end of the light emitting module 25, and then the data voltage stored in the storage capacitor module 22 is correspondingly output to the light emitting module 25, so as to ensure that the light emitting module 25 continues to emit light in one scanning period.

Optionally, the drive module 21, the compensation module 26, the data writing module 23, the pre-writing transistor 241, the first initialization module 271, the second initialization module 272, the first light emission control module 281 and the second light emission control module 282 Specifically, it may include one of any reasonable switching devices such as a triode, a P-type thin film transistor, an N-type thin film transistor, and a field effect transistor, which is not limited in the present application.

It should be noted that, in order to distinguish the two ends of the driving module 21 except the control end, one pole is called the first end, and the other pole is called the second end. When the drive module 21 is a triode, the control terminal can specifically be a base, the first terminal is a collector, and the second terminal is an emitter; or, the control terminal can specifically be a base, and the first terminal is a Emitter, the second terminal is the collector.

And when the driving module 21 is a thin film transistor or a field effect transistor, the control terminal may specifically be a gate, the first terminal may be a drain, and the second terminal may be a source; or, the control terminal may specifically be a gate, The first end is the source, and the second end is the drain.

And the first terminal, the second terminal and the third terminal of each module except the driving module 21 correspond to the first terminal, the second terminal and the control terminal of the driving module 21 respectively.

Wherein, when each module is a thin film transistor or a field effect transistor, it may specifically be a composite transistor or a single transistor, which is not limited in this application.

For the convenience of understanding, taking the above-mentioned modules specifically as P-type thin film transistors as an example, it can be seen that please refer to FIG. 3 and FIG. 4 in conjunction, wherein, FIG. 3 is a schematic structural diagram of a specific embodiment of the pixel circuit in FIG. 4 is a timing diagram of control signals corresponding to the driving method of the pixel circuit in FIG. 3 .

It can be understood that, in this embodiment, as shown in FIG. The first light emission control module 281 and the second light emission control module 282 can specifically correspond to the first transistor T1, the second transistor T2, the eighth transistor T8, the third transistor T3, the fourth transistor T4, the seventh transistor T7, the fifth Transistor T5 and sixth transistor T6; and the storage capacitor module 22 corresponds to the first capacitor C1, the pre-written capacitor 242 corresponds to the second capacitor C2, and the light emitting module 25 corresponds to the light emitting device LED; and the first scan line 202, the second The second scan line 203, the data line 201, the reference voltage line 204 and the emission signal line 205 respectively correspond to the first scan line Scan1, the second scan line Scan2, the data line Vdata, the reference voltage line Vref and the emission signal line EM; The voltage source 101 and the second voltage source 102 correspond to the first voltage source Vdd and the second voltage source Vss respectively; wherein, the third transistor T3 and the fourth transistor T4 can specifically be composite transistors, so as to reduce the driving power of the device pair requirements, and the corresponding connection manners of the above-mentioned components are specifically shown in FIG. 3 , which will not be repeated here.

It can be seen from this that, as shown in FIG. 4, in the initialization and data writing stage, that is, in the t1 stage, the first scanning line Scan1 corresponds to the first scanning signal provided with a low level state, so as to be able to control the fourth transistor correspondingly. T4, the seventh transistor T7, and the eighth transistor T8 are turned on, so that the corresponding initial voltage provided by the reference voltage line Vref is respectively written into the first capacitor C1 and the light-emitting device LED, so as to control the first capacitor C1 and the light-emitting device LED at the same time. Initialize, that is, reset the first capacitor C1 and the light-emitting device LED to clear the signal residue that may exist in the previous stage; and at the same time, provide the data voltage on the data line Vdata to the first terminal of the second capacitor C2 and the first terminal of the second capacitor C2 correspondingly. the first terminal of the second transistor T2, and couple the data voltage into the first capacitor C1 through the second capacitor C2, and then couple the data voltage into the control terminal of the first transistor T1 through the first capacitor C1, so as to Writing of the data voltage in the pixel circuit 20 is completed.

Further, in the threshold compensation phase, that is, in the phase t2, the second scan line Scan2 is in a low-level state corresponding to the second scan signal provided, so as to be able to correspondingly control the second transistor T2 and the third transistor T3 to be triggered and turned on, To transmit the data voltage of the first terminal of the second transistor T2 to the first terminal of the first transistor T1; and at the same time, the third transistor T3 will charge the control terminal of the first transistor T1 to compensate the threshold value of the first transistor T1 Voltage.

Still further, in the light-emitting phase of the display period, that is, in the t3 phase, the emission signal line EM is in a low-level state corresponding to the emission signal provided, so as to be able to correspondingly control the fifth transistor T5 and the sixth transistor T6 to trigger conduction , so that the first transistor T1 drives the light emitting device LED to emit light according to the voltages at the control terminal and the second terminal thereof.

It is understandable that, compared to the traditional 7T1C circuit for Vdata, that is, the writing of the data voltage needs to go through 4 transistors, and the charging impedance is relatively large, so that it is difficult to charge to the predetermined value in a short time. In this embodiment In this process, through the second capacitor C2 and the eighth transistor T8, because the writing of the data voltage only needs to pass through one eighth transistor T8, the second capacitor C2 can be fully charged in a short time during the t1 stage, and then the t2 can be lengthened stage to perform threshold voltage compensation, so that the data voltage writing and threshold voltage compensation stages can be effectively separated, so as to effectively improve the compensation effect and significantly shorten the row writing time.

Further, please continue to refer to FIG. 5 . FIG. 5 is a schematic diagram of the gray scale expansion simulation result of the pixel circuit 20 in FIG. 3 .

It can be seen that, according to the simulation results, the pixel circuit 20 in this embodiment can work normally, and the gray scale is expanded normally. Corresponding to the difference of the gate voltage value Vgs), the internal current ratio is greater than 1E6, which meets the requirement of the on-off ratio of the light-emitting device LED.

The present application also provides a driving method of a pixel circuit, please refer to FIG. 6 , which is a schematic flowchart of an embodiment of a driving method of a pixel circuit of the present application. Specifically, the following steps may be included:

S31: In the data writing phase, control the pre-writing transistor to turn on, so as to transmit the data voltage to the first terminal of the data writing module and the first terminal of the pre-writing capacitor, and the pre-writing capacitor supplies the first terminal of the storage capacitor module One end is coupled to write data voltage.

It can be understood that the driving method in this embodiment is specifically a method in which the driving circuit in the corresponding display panel drives the pixel circuit shown in FIG. 2. For details, please refer to FIG. 2 and FIG. This will not be repeated here.

Wherein, as shown in FIG. 4 , in the data writing stage, that is, in the t1 stage, the first scanning signal corresponding to the first scanning line has a low level state, so as to be able to control the triggering of the pre-writing transistor and the compensation module correspondingly. turn on, so as to transmit the data voltage provided by the data line to the first end of the data writing module and the first end of the pre-writing capacitor, and the pre-writing capacitor is coupled to the first end of the storage capacitor module to write the data voltage, The storage capacitor module will then couple to the control terminal of the drive module to write the data voltage.

S32: In the threshold compensation stage, the control data writing module and the compensation module are turned on, and the control terminal of the driving module is charged to compensate the threshold voltage of the driving module.

Further, in the threshold compensation stage, that is, in the t2 stage, the second scanning signal corresponding to the second scanning line has a low level state, so as to be able to control the conduction of the data writing module and the compensation module correspondingly, so as to write the data The data voltage of the first terminal of the input module is transmitted to the first terminal of the driving module, and at the same time, the compensation module charges the control terminal of the driving module to compensate the threshold voltage of the driving module.

S33: In the light-emitting phase of the display period, control the first light-emitting control module and the second light-emitting control module to be turned on, so that the driving module drives the light-emitting module to emit light according to the voltages of its control terminal and second terminal.

Still further, in the light-emitting phase of the display period, that is, in the t3 phase, the emission signal line corresponding to the provided emission signal has a low level state, so as to be able to correspondingly control the first light-emitting control module and the second light-emitting control module to trigger the conduction. so that the driving module drives the light-emitting module to emit light according to the voltages of the control terminal and the second terminal.

Further, in an embodiment, the above S31 may specifically include: the initialization phase, that is, in the t1 phase, the first scan line corresponding to the first scan signal provided has a low level state, so as to simultaneously control the first initialization module and the second initialization module, so that the initial voltage provided by the reference voltage line is respectively written into the second terminal of the storage capacitor module and the first terminal of the light-emitting module, so as to initialize the adjustable capacitor module and the light-emitting module at the same time, and also Even if the adjustable capacitor module and the light emitting module are reset, the residual signal that may exist in the previous stage is eliminated.

The present application also provides a display panel, please refer to FIG. 7 , which is a schematic structural diagram of an embodiment of the display panel of the present application. In this embodiment, the display panel 40 includes a driving circuit 41 and a pixel circuit 42 connected thereto.

It should be noted that the pixel circuit 42 described in this embodiment is the pixel circuit 10 or the pixel circuit 20 described in any one of the above-mentioned embodiments. For details, please refer to FIGS. 1-5 and related texts. Let me repeat.

The beneficial effects of the present application are: different from the prior art, the first terminal of the driving module in the pixel circuit provided by the present application is connected to the first voltage source, and the first terminal and the second terminal of the storage capacitor module are respectively connected to the first voltage source and the control terminal of the driving module, the second terminal and the third terminal of the data writing module are respectively connected to the first terminal and the second scanning line of the driving module, and the first terminal, the second terminal and the third terminal of the pre-writing module and the fourth terminal are respectively connected to the data line, the first terminal of the data writing module, the first scanning line and the first terminal of the storage capacitor module, and the first terminal and the second terminal of the light emitting module are respectively connected to the second terminal and the second terminal of the driving module. The second voltage source, wherein the pre-writing module is used to provide the data voltage on the data line to the first end of the data writing module and the first end of the storage capacitor module, so as to write and drive the data voltage The compensation stage of the threshold voltage of the module is separated, so that the compensation effect can be effectively improved, and the row writing time can be significantly shortened to ensure the high-refresh display function.

The above is only the implementation of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent process conversion made by using the specification and drawings of the application, or directly or indirectly used in other related technologies fields, are all included in the scope of patent protection of this application in the same way.

Claims (10)

1. A pixel circuit, the pixel circuit comprising:

the first end of the driving module is connected with a first voltage source;

the first end of the storage capacitor module is connected with the first voltage source, and the second end of the storage capacitor module is connected with the control end of the driving module;

the second end of the data writing module is connected with the first end of the driving module, and the third end of the data writing module is connected with the second scanning line;

the first end of the pre-writing module is connected with a data line, the second end of the pre-writing module is connected with the first end of the data writing module, the third end of the pre-writing module is connected with a first scanning line, and the fourth end of the pre-writing module is connected with the first end of the storage capacitor module so as to be used for providing data voltage on the data line to the first end of the data writing module and the first end of the storage capacitor module;

the first end of the light emitting module is connected with the second end of the driving module, and the second end of the light emitting module is connected with a second voltage source.

2. The pixel circuit according to claim 1, wherein,

the pre-writing module comprises a pre-writing transistor and a pre-writing capacitor, wherein a first end of the pre-writing transistor is connected with the data line, a second end of the pre-writing transistor is connected with the first end of the pre-writing capacitor and the first end of the data writing module, a third end of the pre-writing transistor is connected with the first scanning line, and a second end of the pre-writing capacitor is connected with the first end of the storage capacitor module.

3. The pixel circuit according to claim 2, wherein,

the pixel circuit further comprises a compensation module, a first end of the compensation module is connected with the control end of the driving module, a second end of the compensation module is connected with the second end of the driving module, and a third end of the compensation module is connected with the second scanning line and used for controlling communication between the control end of the driving module and the second end of the driving module.

4. A pixel circuit according to claim 3, wherein,

the compensation module is a double-gate transistor and comprises a first compensation transistor and a second compensation transistor, wherein a first end of the first compensation transistor is connected with a control end of the driving module, a second end of the first compensation transistor is connected with a first end of the second compensation transistor, a third end of the first compensation transistor is connected with a third end of the second compensation transistor and the second scanning line, and a second end of the second compensation transistor is connected with a second end of the driving module.

5. A pixel circuit according to claim 3, wherein,

the pixel circuit further comprises a first initialization module and a second initialization module, wherein a first end of the first initialization module is connected with a control end of the driving module, a second end of the first initialization module is connected with a first end of the second initialization module and a reference voltage line, a third end of the first initialization module is connected with a first scanning line, a second end of the second initialization module is connected with a first end of the light emitting module, and a third end of the second initialization module is connected with the first scanning line so as to be used for controlling writing of initial voltage into a second end of the storage capacitor module and the first end of the light emitting module.

6. The pixel circuit of claim 5, wherein,

the first initialization module is a double-gate transistor and comprises a first initialization transistor and a second initialization transistor, wherein a first end of the first initialization transistor is connected with a control end of the driving module, a second end of the first initialization transistor is connected with a first end of the second initialization transistor, a third end of the first initialization transistor is connected with a third end of the second initialization transistor and the first scanning line, and a second end of the second initialization transistor is connected with a first end of the second initialization module and the reference voltage line.

7. The pixel circuit of claim 5, wherein,

the pixel circuit further comprises a first light-emitting control module and a second light-emitting control module, wherein a first end of the first light-emitting control module is connected with the first voltage source, a second end of the first light-emitting control module is connected with a first end of the driving module, and a third end of the first light-emitting control module is connected with an emission signal line for controlling communication between the first voltage source and the first end of the driving module;

the first end of the second light-emitting control module is connected with the second end of the driving module, the second end of the second light-emitting control module is connected with the first end of the light-emitting module, and the third end of the second light-emitting control module is connected with the emission signal line so as to be used for controlling the communication between the second end of the driving module and the first end of the light-emitting module.

8. A driving method of a pixel circuit, characterized by being applied to the pixel circuit described in claim 7, comprising:

in a data writing stage, controlling the pre-writing transistor to be conducted so as to transmit the data voltage to the first end of the data writing module and the first end of the pre-writing capacitor, wherein the pre-writing capacitor is used for coupling and writing the data voltage to the first end of the storage capacitor module;

in a threshold compensation stage, the data writing module and the compensation module are controlled to be conducted, and a control end of the driving module is charged to compensate the threshold voltage of the driving module;

and in a light-emitting stage in the display period, controlling the first light-emitting control module and the second light-emitting control module to be conducted so that the driving module drives the light-emitting module to emit light according to the voltages of the control end and the second end of the driving module.

9. The method for driving a pixel circuit according to claim 8, wherein,

the data writing stage further comprises: and controlling the first initialization module and the second initialization module to be conducted so as to write initial voltage into the second end of the storage capacitor module and the first end of the light-emitting module.

10. A display panel, characterized in that the display panel comprises a driving circuit and a pixel circuit which are connected;

wherein the pixel circuit is a pixel circuit according to any one of claims 1 to 7.

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