CN110517639A - Pixel compensation circuit, pixel circuit, display device and pixel compensation method - Google Patents

Abstract

The present application provides a pixel compensation circuit, a pixel circuit, a display device and a pixel compensation method, which relate to the field of display technology. The pixel compensation circuit includes: the first terminal and the second terminal of the charge storage module are electrically connected to the first node and the second node respectively; the first terminal, the second terminal and the third terminal of the driving module are respectively connected to the first node The node, the first voltage terminal, and the third node are electrically connected; the first terminal, the second terminal, and the third terminal of the light-emitting control module are respectively used for electrically connecting the light-emitting signal line, the first voltage terminal, and the first terminal of the light-emitting element ; The fourth terminal and the fifth terminal of the lighting control module are electrically connected to the second node and the third node respectively. The pixel circuit includes a light emitting element and a pixel compensation circuit, and the display device includes a pixel circuit. The present application is used to solve the existing technical problems that the threshold voltage compensation effect between different pixels is limited, or the driving voltage of the driving module is prone to instability.

Description

Pixel compensation circuit, pixel circuit, display device and pixel compensation method

technical field

The present application relates to the field of display technology, and in particular to a pixel compensation circuit, a pixel circuit, a display device and a pixel compensation method.

Background technique

OLED (Organic Light-Emitting Diode, organic light-emitting diode) has the advantages of self-illumination, high contrast and wide color gamut, and also has the advantages of simple preparation process, low cost, low power consumption and easy realization of flexible display. Current-mode light-emitting devices have been increasingly used in new-generation display devices, and have broad application prospects.

However, the threshold voltage Vth of different pixels differs greatly, and the compensation effect of the threshold voltage Vth is limited, which makes the display difficult to control. Moreover, the driving voltage of the driving module used in the existing OLED circuit is prone to unstable problems, especially in black screens and low gray scales, it is easy to produce uneven light emission, thereby reducing the performance of the product.

Contents of the invention

The purpose of this application is to provide a pixel compensation circuit, a pixel circuit, a display device and a pixel compensation method to solve the existing technology that the threshold voltage compensation effect between different pixels is limited, or the driving voltage of the driving module is prone to instability question.

In order to achieve the above object, in the first aspect, the present application provides a pixel compensation circuit, including: a charge storage module, a drive module, a light emission control module, a first switch module, a second switch module, and a third switch module;

The first terminal and the second terminal of the charge storage module are electrically connected to the first node and the second node respectively;

The first terminal, the second terminal and the third terminal of the driving module are respectively electrically connected to the first node, the first voltage terminal and the third node;

The first terminal, the second terminal, and the third terminal of the lighting control module are respectively used for electrical connection with the lighting signal line, the first voltage terminal, and the first terminal of the lighting element;

The fourth terminal and the fifth terminal of the lighting control module are electrically connected to the second node and the third node respectively;

The first terminal and the second terminal of the first switch module are respectively used to be electrically connected to the first control signal line and the initialization signal line, and the third terminal of the first switch module is electrically connected to the third node;

The first terminal of the second switch module is used to be electrically connected to the second control signal line, and the second terminal and the third terminal of the second switch module are respectively electrically connected to the third node and the first node;

The first terminal and the second terminal of the third switch module are respectively used to be electrically connected to the first gate signal line and the data signal line, and the third terminal of the third switch module is electrically connected to the second node.

Optionally, the pixel compensation circuit further includes: a fourth switch module;

The first terminal, the second terminal and the third terminal of the fourth switch module are respectively used for electrical connection with the first gate signal line, the initialization signal line and the first terminal of the light emitting element.

Optionally, the charge storage module includes a first capacitor;

The first pole and the second pole of the first capacitor serve as the first terminal and the second terminal of the charge storage module respectively.

Optionally, the driving module includes a third transistor;

The control electrode, the first electrode and the second electrode of the third transistor serve as the first terminal, the second terminal and the third terminal of the driving module respectively.

Optionally, the light emission control module includes a fifth transistor and a sixth transistor;

The control electrode of the fifth transistor and the control electrode of the sixth transistor are jointly used as the first terminal of the light-emitting control module;

The first pole and the second pole of the fifth transistor serve as the second terminal and the fourth terminal of the lighting control module respectively;

The first pole and the second pole of the sixth transistor serve as the fifth terminal and the third terminal of the light emitting control module respectively.

Optionally, the first switch module includes a first transistor, and the control pole, first pole, and second pole of the first transistor serve as the first end, second end, and third end of the first switch module, respectively;

The second switch module includes a second transistor, the control pole, the first pole, and the second pole of the second transistor serve as the first terminal, the second terminal, and the third terminal of the second switch module, respectively;

The third switch module includes a fourth transistor, and the control electrode, the first electrode, and the second electrode of the fourth transistor serve as the first terminal, the second terminal, and the third terminal of the third switch module, respectively.

Optionally, the fourth switch module includes a seventh transistor, and the control electrode, the first electrode, and the second electrode of the seventh transistor serve as the first terminal, the second terminal, and the third terminal of the fourth switch module, respectively.

Optionally, each transistor is a thin film transistor, and the control pole of any transistor is the gate of the thin film transistor;

If the first pole of the transistor is the source of the thin film transistor, the second pole of the transistor is the drain of the thin film transistor;

If the first pole of the transistor is the drain of the thin film transistor, the second pole of the transistor is the source of the thin film transistor.

In the second aspect, the present application also provides a pixel circuit, including: a light emitting element and the pixel compensation circuit in the first aspect;

The first terminal and the second terminal of the light emitting element are respectively electrically connected to the second terminal and the second voltage terminal of the light emitting control module.

Optionally, the light-emitting element is an organic light-emitting diode OLED;

The anode and the cathode of the OLED serve as the first end and the second end of the light emitting element respectively.

In a third aspect, the present application further provides a display device, including the pixel circuit in the second aspect.

In the fourth aspect, the present application also provides a pixel compensation method, which is applied to the pixel compensation circuit in the first aspect, and the pixel compensation method includes:

In the first stage, the first switch module and the second switch module are respectively turned on, and the initialization voltage of the initialization signal line is sent to the first node, and the driving module is turned on;

In the second stage, the drive module and the second switch module are kept in the on state, the first switch module is turned off, and the third switch module is turned on;

The first voltage of the first voltage end is sent to the first end of the charge storage module electrically connected to the first node, and the data voltage output by the data signal line is sent to the second end of the charge storage module electrically connected to the second node, and the The charge storage module is charged;

When the difference between the voltage at the first terminal of the charge storage module and the first voltage reaches the threshold voltage of the drive module, the drive module is turned off, and the charge storage module stops charging;

In the third stage, the third switch module and the second switch module are closed, and the first switch module remains closed;

The first terminal of the lighting control module receives the lighting signal, the third terminal and the fifth terminal of the lighting control module are turned on, the second terminal of the lighting control module and the fourth terminal of the lighting control module are turned on, and the first voltage of the first voltage terminal is output to the second terminal of the charge storage module;

The voltage of the first node is bootstrapped by the charge storage module to the difference between the first voltage and the voltage stored in the charge storage module, and the driving module is turned on, so that the first voltage end is turned on with the third end of the light-emitting control module, and the driving current is output to the pixel Light-emitting elements outside the drive circuit.

Optionally, in the second stage, the fourth switch module is turned on, the initialization voltage of the initialization signal line is output to the first end of the light emitting element, and the voltage at the first end of the light emitting element is initialized;

The first terminal, the second terminal and the third terminal of the fourth switch module are respectively used for electrical connection with the first gate signal line, the initialization signal line and the first terminal of the light emitting element.

Compared with the prior art, the technical solution of the present application has at least the following beneficial technical effects:

1) The first voltage of the first voltage end of the pixel compensation circuit of the present application is written into the first end of the charge storage module through the drive module and the second switch module, and the data voltage output by the data signal line is written through the third switch module. into the second end of the charge storage module, using two paths to write signal voltage, which improves the effect of signal voltage writing, thereby improving the effect of threshold voltage compensation, reducing the difference in threshold voltage between different pixels, and solving the problem of The existing technical problem that the threshold voltage compensation effect between different pixels is limited is solved.

2) A second switch module is connected between the first end of the drive module of the present application and the first switch module, and the first end of the drive module is not directly connected to the first switch module, which can avoid or reduce the leakage of the first switch module. Influenced by the stability of the driving voltage at the first end of the driving module, the quality of the pixel compensation circuit is improved, uneven light emission is avoided, and product performance is improved.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and will become apparent from the description, or may be learned by practice of the application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic diagram of the principle of an existing OLED pixel compensation circuit;

FIG. 2 is a schematic diagram of the principle of a pixel compensation circuit in an embodiment of the present application;

FIG. 3 is a flowchart of a pixel compensation method according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a timing sequence of a control signal of a pixel compensation circuit according to an embodiment of the present application.

Reference signs:

Gate is the first gate signal line, EM is the light emitting signal line, V _Data is the data signal line, V _DD is the first voltage terminal, V _SS is the second voltage terminal, Reset is the first control signal line, Vinit is the initialization signal line, Sn represents the second control signal line;

T1', T2', T3', T4', T5', T6', T7' are thin film transistors (Thin Film Transistor, TFT), Cst' is storage capacitor;

1—charge storage module, 2—drive module, 3—luminescence control module, 4—first switch module, 5—second switch module, 6—third switch module, 7—fourth switch module;

T1 is the first transistor, T2 is the second transistor, T3 is the third transistor, T4 is the fourth transistor, T5 is the fifth transistor, T6 is the sixth transistor, T7 is the seventh transistor;

Cst is the first capacitor, N1 is the first node, N2 is the second node, and N3 is the third node.

Detailed ways

Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present application, and are not construed as limiting the present application.

Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as commonly understood by those of ordinary skill in the art to which this application belongs. It should also be understood that terms, such as those defined in commonly used dictionaries, should be understood to have meanings consistent with their meaning in the context of the prior art, and unless specifically defined as herein, are not intended to be idealized or overly Formal meaning to explain.

Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements and/or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components, and/or groups thereof. The expression "and/or" used herein includes all or any elements and all combinations of one or more associated listed items.

The inventors of the present application conducted research and found that the existing OLED pixel compensation circuit is shown in Figure 1, and the data voltage V _data and the threshold voltage V _th output by the data signal line of the existing pixel compensation circuit simultaneously change from T4'→T3'→ The T2' path is used to write into the lower plate of the storage capacitor Cst'. This single path method is used to write into the storage capacitor Cst', which may easily lead to incomplete writing of the signal voltage, so that the compensation effect of the threshold voltage V _th is limited. Moreover, the thin film transistor T1' is directly connected to the gate of the thin film transistor T3' (equivalent to the driving module of the present application). If the thin film transistor T1' leaks electricity, the gate voltage of the thin film transistor T3' will be unstable, resulting in display The phenomenon of uneven light emission of the device.

The pixel compensation circuit, pixel circuit, display device and pixel compensation method provided in this application aim to solve the above technical problems in the prior art.

The technical solution of the present application and how the technical solution of the present application solves the above technical problems will be described in detail below with specific embodiments. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below in conjunction with the accompanying drawings.

An embodiment of the present application provides a pixel compensation circuit, as shown in FIG. 2 , the pixel compensation circuit includes: a charge storage module 1, a drive module 2, a light emission control module 3, a first switch module 4, a second switch module 5, and The third switch module 6;

The first terminal and the second terminal of the charge storage module 1 are electrically connected to the first node N1 and the second node N2 respectively;

The first terminal, the second terminal and the third terminal of the driving module 2 are respectively electrically connected to the first node N1, the first voltage terminal V _DD and the third node N3;

The first terminal, the second terminal and the third terminal of the light emitting control module 3 are respectively used for electrically connecting with the light emitting signal line EM, the first voltage terminal V _DD , and the first terminal of the light emitting element OLED;

The fourth terminal and the fifth terminal of the lighting control module 3 are electrically connected to the second node N2 and the third node N3 respectively;

The first terminal and the second terminal of the first switch module 4 are respectively used to electrically connect the first control signal line RESET and the initialization signal line Vinit, and the third terminal of the first switch module 4 is electrically connected to the third node N3;

The first terminal of the second switch module 5 is used to be electrically connected to the second control signal line Sn, and the second terminal and the third terminal of the second switch module 5 are respectively electrically connected to the third node N3 and the first node N1;

The first terminal and the second terminal of the third switch module 6 are respectively used to electrically connect the first gate signal line Gate and the data signal line V _Data , and the third terminal of the third switch module 6 is electrically connected to the second node N2 .

The first voltage V _dd of the first voltage terminal V _DD of the pixel compensation circuit in the embodiment of the present application is written into the first terminal of the charge storage module 1 through the drive module 2 and the second switch module 5 , and the data signal line V _Data The output data voltage V _data is written into the second terminal of the charge storage module 1 through the third switch module 6, and the signal voltage is written in two paths, which improves the effect of writing the signal voltage, thereby increasing the threshold voltage V _th The compensation effect reduces the difference of the threshold voltage V _th between different pixels, and solves the existing technical problem that the compensation effect of the threshold voltage between different pixels is limited.

Moreover, the second switch module 5 is connected between the first end of the drive module 2 and the first switch module 4 in the embodiment of the present application, and the first end of the drive module 2 is not directly connected to the first switch module 4, which can avoid or The impact of the leakage of the first switch module 4 on the stability of the driving voltage at the first end of the driving module 2 is reduced, the quality of the pixel compensation circuit is improved, uneven light emission is avoided, and product performance is improved. At the same time, the first switch module 4 and the second switch module 5 are turned off at the same time, which can better prevent the influence of leakage on the stability of the driving voltage at the first end of the driving module 2 . The pixel compensation circuit of the embodiment of the present application can be applied in an AMOLED (ActiveMatrix/Organic Light Emitting Diode active matrix organic light emitting diode panel).

Optionally, the pixel compensation circuit further includes: a fourth switch module 7; the first terminal, the second terminal, and the third terminal of the fourth switch module 7 are respectively used to communicate with the first gate signal line Gate and the initialization signal line Vinit is electrically connected to the first end of the light emitting element. The fourth switch module 7 is connected to the initialization signal line Vinit, which can initialize the light-emitting element, clean up the remaining carriers of the light-emitting element (such as OLED), and make the light emitting uniform. Those skilled in the art can understand that the initialization signal line Vinit connected to the fourth switch module 7 and the initialization signal line Vinit connected to the first switch module 4 may be the same signal line, or different signal lines, or In fact, it is selected according to the layout design, as long as the effect of initializing the input signal voltage can be realized.

Optionally, the charge storage module 1 includes a first capacitor Cst; the first pole and the second pole of the first capacitor Cst serve as the first end and the second end of the charge storage module 1 respectively. The first electrode of the first capacitor Cst is the lower plate, and the second electrode of the first capacitor Cst is the upper plate.

Optionally, the driving module 2 includes a third transistor T3; the control electrode, the first electrode and the second electrode of the third transistor T3 serve as the first terminal, the second terminal and the third terminal of the driving module 2 respectively.

Optionally, the light emission control module 3 includes a fifth transistor T5 and a sixth transistor T6;

The control electrode of the fifth transistor T5 and the control electrode of the sixth transistor T6 are jointly used as the first terminal of the light-emitting control module 3 ;

The first pole and the second pole of the fifth transistor T5 serve as the second terminal and the fourth terminal of the light emitting control module 3 respectively;

The first pole and the second pole of the sixth transistor T6 serve as the fifth terminal and the third terminal of the light emitting control module 3 respectively.

Optionally, the first switch module 4 includes a first transistor T1, and the control pole, first pole, and second pole of the first transistor T1 serve as the first end, second end, and third end of the first switch module 4, respectively;

The second switch module 5 includes a second transistor T2, the control pole, the first pole, and the second pole of the second transistor T2 serve as the first terminal, the second terminal, and the third terminal of the second switch module 5, respectively;

The third switch module 6 includes a fourth transistor T4, and the control electrode, the first electrode and the second electrode of the fourth transistor T4 serve as the first terminal, the second terminal and the third terminal of the third switch module 6 respectively.

Optionally, the fourth switch module 7 includes a seventh transistor T7, and the control electrode, the first electrode, and the second electrode of the seventh transistor T7 serve as the first terminal, the second terminal, and the third terminal of the fourth switch module 7, respectively.

Optionally, each transistor is a thin film transistor, and the control pole of any transistor is the gate of the thin film transistor;

If the first pole of the transistor is the source of the thin film transistor, the second pole of the transistor is the drain of the thin film transistor;

If the first pole of the transistor is the drain of the thin film transistor, the second pole of the transistor is the source of the thin film transistor.

Those skilled in the art can understand that the circuit connection shown in FIG. 2 is only an example of the pixel driving circuit provided in the embodiment of the present application. When each transistor is a P-type TFT or an N-type TFT or the first pole of each transistor When the second pole and the second pole are different poles of the TFT, the electrical connection mode of each element in the pixel driving circuit provided by the embodiment of the present application can be adjusted adaptively, and the adaptively adjusted electrical connection mode still belongs to the protection of the embodiment of the present application scope.

Based on the same inventive concept, an embodiment of the present application also provides a pixel circuit, as shown in FIG. 2 , the pixel circuit includes: a light-emitting element and the above-mentioned pixel compensation circuit;

The first terminal and the second terminal of the light emitting element are respectively electrically connected to the second terminal of the lighting control module 3 and the second voltage terminal V _SS .

Optionally, the light-emitting element is an organic light-emitting diode OLED; the anode and cathode of the OLED serve as the first end and the second end of the light-emitting element, respectively.

Based on the same inventive concept, an embodiment of the present application further provides a display device, including the above-mentioned pixel circuit.

Based on the same inventive concept, the embodiment of the present application also provides a pixel compensation method, as shown in FIG. 3 , which is applied to the above pixel compensation circuit. The pixel compensation method includes:

S101. In the first stage, the first switch module 4 and the second switch module 5 are turned on respectively, and the initialization voltage _Vinit of the initialization signal line Vinit is sent to the first node N1, and the driving module 2 is turned on.

The first terminal of the driving module 2 is electrically connected to the first node N1. When the voltage of the first node N1 changes, the voltage of the first terminal of the driving module 2 changes, so that the driving module 2 is turned on.

S102. In the second stage, the drive module 2 and the second switch module 5 remain on, the first switch module 4 is turned off, and the third switch module 6 is turned on; the first voltage V _dd of the first voltage terminal V _DD is sent to the The first node N1 is electrically connected to the first end of the charge storage module 1, and the data voltage V _data output by the data signal line V _Data is sent to the second end of the charge storage module 1 electrically connected to the second node N2 to store charges together. The module 1 is charging; when the difference between the voltage of the first terminal of the charge storage module 1 and the first voltage V _dd reaches the threshold voltage V _th of the drive module 2 , the drive module 2 is turned off, and the charge storage module 1 stops charging.

Wherein, the first voltage V _dd of the first voltage terminal V _DD may be a power supply voltage, a DC high-level signal.

Optionally, in step S102, in the second stage, the fourth switch module 7 is turned on, the initialization voltage _Vinit of the initialization signal line Vinit is output to the first end of the light emitting element, and the voltage at the first end of the light emitting element is initialized;

The first terminal, the second terminal and the third terminal of the fourth switch module 7 are respectively used to electrically connect with the first gate signal line Gate, the initialization signal line Vinit, and the first terminal of the light emitting element.

S103. In the third stage, the third switch module 6 and the second switch module 5 are turned off, and the first switch module 4 remains in the off state; the first end of the lighting control module 3 receives the lighting signal, and the third terminal of the lighting control module 3 and the fifth end conduction, the second end of the light emission control module 3 and the fourth end of the light emission control module 3 conduction, the first voltage V _dd of the first voltage end V _DD is output to the second end of the charge storage module 1; the first node The voltage of N1 is bootstrapped by the charge storage module 1 to the difference between the first voltage V _dd and the voltage stored in the charge storage module 1, and the drive module 2 is turned on, so that the first voltage terminal V _DD is connected to the third terminal of the light-emitting control module 3 , outputting the driving current to the light emitting element outside the pixel driving circuit.

Referring to the pixel circuit shown in FIG. 2, the pixel compensation method shown in FIG. 3, and the schematic diagram of control signals of the pixel compensation circuit shown in FIG. The pixel compensation method is specifically introduced as follows:

Phase 1: Reset/Initialization phase

The light emitting signal line EM is at a high level, and the fifth transistor T5 and the sixth transistor T6 are turned off. The first gate signal line Gate is at high level, and the fourth transistor T4 and the seventh transistor T7 are turned off. When the first control signal line Reset is at low level, the first transistor T1 is turned on; when the second control signal line Sn is at low level, the second transistor T2 is turned on. At this time, the initialization voltage V _init is written into the first pole (i.e., the lower plate) of the first capacitor Cst in the path of T1→T2, and the gate voltage of T3 of the third transistor is initialized, and T3 of the third transistor is turned on, and at the same time, the gate voltage of the third transistor is turned on. A capacity initialization of the capacitor Cst.

The second stage: signal writing stage

The light emitting signal line EM is at a high level, and the fifth transistor T5 and the sixth transistor T6 are turned off. The first gate signal line Gate is at low level, and the fourth transistor T4 and the seventh transistor T7 are turned on. The first control signal line Reset is at a high level, and the first transistor T1 is turned off. The second control signal line Sn is at low level, and the second transistor T2 is turned on. At this time, the initialization voltage _Vinit is written into the anode of the OLED through the path of the seventh transistor T7, and the voltage of the anode of the OLED is initialized; the data voltage V _data output by the data signal line V _Data is written into the first capacitor Cst through the path of the fourth transistor T4. Two poles (that is, the upper plate); the first voltage V _dd of the first voltage terminal V _DD charges the first pole (ie, the lower plate) of the first capacitor Cst in a T3→T2 path. When the difference between the first pole of the first capacitor Cst, that is, the voltage of the first node N1 and the first voltage V _dd of the first voltage terminal V _DD is the threshold voltage V _th of the third transistor T3 , the third transistor T3 When it is turned off, the first capacitor Cst stops charging, and the voltage of the first electrode of the first capacitor Cst is stable at the value of V _dd +V _th , that is, the voltage of the first node N1 is stable at the value of V _dd +V _th . At this time, the storage voltage of the first capacitor Cst is V _data -V _dd -V _th .

The third stage: driving/lighting stage

The light emitting signal line EM is at low level, and the fifth transistor T5 and the sixth transistor T6 are turned on. The first gate signal line Gate is at high level, and the fourth transistor T4 and the seventh transistor T7 are turned off. The first control signal line Reset is at a high level, and the first transistor T1 is turned off. The second control signal line Sn is at high level, and the second transistor T2 is turned off. At this time, the first voltage V _dd signal of the first voltage terminal V _DD is written into the second pole (that is, the upper plate) of the first capacitor Cst through the fifth transistor T5 path, that is, the second node N2, and the capacitor storage voltage is V _data -V _dd -V _th . According to the capacitance bootstrap effect, the voltage of the first electrode of the first capacitor Cst is 2V _dd +V _th -V _data , that is, the voltage of the first node N1 is 2V _dd +V _th -V _data .

At this time, the gate-source voltage of T3 is the expression (1):

V _gs =V _dd +V _th -V _data expression (1)

Wherein, V _gs represents a gate-to-source voltage. In a TFT device, the gate-to-source voltage V _gs is equal to the gate voltage V _g minus the source voltage V _s .

According to the expression (1), the following expression (2) is obtained:

V _gs -V _th = V _dd -V _data expression (2)

According to the current of the third transistor T3 is the expression (3):

Id=0.5*μ*Cox*W/L(V _gs -V _th ) ² expression (3)

Among them, Id represents the drain current (drain current), μ represents the carrier mobility (carrier mobility), Cox represents the oxide capacity (Oxide capacity), W represents the device channel width (wide TFT), L represents the device channel length (length TFT);

Substitute expression (2) into expression (3) to get expression (4):

Id=0.5*μ*Cox*W/L(V _dd -V _data ) ² expression (4)

According to expression (4), it can be known that the threshold voltage _Vth is eliminated in the calculation of the current Id of the third transistor T3, and the current Id of the third transistor T3 has nothing to do with the threshold voltage _Vth , that is, the driving compensation circuit of the present application is adopted, Two paths are used to write the signal voltage, and the signal voltage is completely written, then the light emission of the pixel circuit is no longer affected by the threshold voltage V _th , and the compensation effect of the threshold voltage V _th is achieved.

Referring to Fig. 4, as an example, the high level of the light-emitting signal line EM is 6v, and the low level is -6v; the high level of the first control signal line Reset is 6v, and the low level is -6v; The high level of a gate signal line Gate is 6v, and the low level is -6v; the high level of the second control signal line Sn is 6v, and the low level is -6v; the data voltage output by the data signal line V _Data is V The range of _data is 2 ~ 4.5v.

Applying the pixel circuit, display device and pixel compensation method provided by the embodiment of the present application has the same inventive concept and the same beneficial effect as the previous pixel compensation circuit, and the content of the pixel circuit, display device and pixel compensation method not shown in detail Reference may be made to the foregoing embodiments, and details are not repeated here.

Those skilled in the art can understand that the various operations, methods, and steps, measures, and schemes in the processes that have been discussed in this application can be replaced, changed, combined, or deleted. Furthermore, the various operations, methods, and other steps, measures, and schemes in the processes that have been discussed in this application may also be replaced, changed, rearranged, decomposed, combined, or deleted. Further, steps, measures, and schemes in the prior art that have operations, methods, and processes disclosed in the present application may also be alternated, changed, rearranged, decomposed, combined, or deleted.

The terms "first" and "second" 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, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present application, unless otherwise specified, "plurality" means two or more. "Comprising" or "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other elements or items. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

The terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", The orientation or positional relationship indicated by "outside" is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, Constructed and operative in a particular orientation and therefore are not to be construed as limitations of the invention. When an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, the element may be "directly on" or "under" the other element, or there may be middle element.

It should be understood that although the various steps in the flow chart of the accompanying drawings are displayed in sequence according to the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some of the steps in the flow charts of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but may be executed at different times, and the order of execution is also It is not necessarily performed sequentially, but may be performed alternately or alternately with at least a part of other steps or sub-steps or stages of other steps.

The above description is the preferred implementation mode of the present application. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications can also be made without departing from the principles described in the application. These improvements and modifications are also It should be regarded as the protection scope of this application.

The above description is only a part of the implementation of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, some improvements and modifications can also be made. These improvements and modifications are also It should be regarded as the protection scope of this application.

Claims (13)

1. a kind of pixel compensation circuit characterized by comprising charge storage module, drive module, light emitting control module, One switch module, second switch module and third switch module；

First end, the second end of the charge storage module, are electrically connected with first node, second node respectively；

The first end of the drive module, second end, third end, respectively with the first node, first voltage end, third node Electrical connection；

The first end of the light emitting control module, second end, third end are respectively used to and luminous signal line, the first voltage The first end electrical connection at end, light-emitting component；

The 4th end, the 5th end of the light emitting control module are electrically connected with the second node and the third node respectively；

First end, the second end of the first switch module are respectively used to and first control signal line and initializing signal line electricity Connection, the third end of the first switch module is electrically connected with the third node；

The first end of the second switch module with second control signal line for being electrically connected, and the second of the second switch module End, third end, are electrically connected with the third node and the first node respectively；

First end, the second end of the third switch module are respectively used to be electrically connected with first grid signal wire, data signal line It connects, the third end of the third switch module is electrically connected with the second node.

2. pixel compensation circuit according to claim 1, which is characterized in that further include: the 4th switch module；

First end, the second end, third end of 4th switch module are respectively used to and the first grid signal wire, described The first end electrical connection of initializing signal line, the light-emitting component.

3. pixel compensation circuit according to claim 1, which is characterized in that the charge storage module includes the first electricity Hold；

The first pole, the second pole of the first capacitor, first end, second end respectively as the charge storage module.

4. pixel compensation circuit according to claim 1, which is characterized in that the drive module includes third transistor；

The control electrode of the third transistor, the first pole, the second pole, respectively as the first end of the drive module, second end, Third end.

5. pixel compensation circuit according to claim 1, which is characterized in that the light emitting control module includes the 5th crystal Pipe and the 6th transistor；

The control electrode of 5th transistor and the control electrode of the 6th transistor are collectively as the first of the light emitting control module End；

The first pole, the second pole of 5th transistor, second end, the 4th end respectively as the light emitting control module；

The first pole, the second pole of 6th transistor, respectively as the 5th end, the third end of the light emitting control module.

6. pixel compensation circuit according to claim 1, which is characterized in that the first switch module includes first crystal Pipe, the control electrode of the first transistor, the first pole, the second pole, respectively as the first switch module first end, second End, third end；

Second switch module includes second transistor, the control electrode of the second transistor, the first pole, the second pole, respectively as The first end of the second switch module, second end, third end；

Third switch module include the 4th transistor, the control electrode of the 4th transistor, the first pole, the second pole, respectively as The first end of the third switch module, second end, third end.

7. pixel compensation circuit according to claim 2, which is characterized in that the 4th switch module includes the 7th crystal Pipe, the control electrode of the 7th transistor, the first pole, the second pole, respectively as the 4th switch module first end, second End, third end.

8. the pixel compensation circuit according to any one of claim 3-7, which is characterized in that each transistor is thin Film transistor, the grid of the extremely described thin film transistor (TFT) of control of any transistor；

If the source electrode of the first of the transistor extremely described thin film transistor (TFT), the extremely described film of the second of the transistor The drain electrode of transistor；

If the drain electrode of the first of the transistor extremely described thin film transistor (TFT), the extremely described film of the second of the transistor The source electrode of transistor.

9. a kind of pixel circuit characterized by comprising light-emitting component and such as pixel described in any item of the claim 1 to 8 Compensation circuit；

First end, the second end of the light-emitting component are electrically connected with the second end of the light emitting control module, second voltage end respectively It connects.

10. pixel circuit according to claim 9, which is characterized in that the light-emitting component is Organic Light Emitting Diode OLED；

Anode, the cathode of the OLED, first end, second end respectively as the light-emitting component.

11. a kind of display device, which is characterized in that including the pixel circuit as described in claim 9 or 10.

12. a kind of pixel compensation method, which is characterized in that be applied to such as pixel compensation described in any item of the claim 1 to 8 Circuit, the pixel compensation method include:

First stage, the first switch module and second switch module are respectively turned on, by the initial of the initializing signal line Change voltage and is delivered to first node, the drive module conducting；

Second stage, the drive module and the second switch module tend to remain on, and the first switch module is closed, The third switch module conducting；

The first voltage at the first voltage end is delivered to the first end for the charge storage module being electrically connected with first node, The data voltage of the data signal line output is delivered to the second end for the charge storage module being electrically connected with second node, It charges jointly to the charge storage module；

When the voltage of first end and the difference of the first voltage of the charge storage module reach the threshold of the drive module When threshold voltage, the drive module is closed, and the charge storage module stops charging；

Phase III, the third switch module and the second switch module are closed, and the first switch module remains turned-off State；

The first end of the light emitting control module receives luminous signal, the light emitting control module third end and the conducting of the 5th end, The conducting of 4th end of the second end of the light emitting control module and the light emitting control module, first electricity at the first voltage end Pressure is exported to the second end of the charge storage module；

The voltage of the first node is booted by the charge storage module into the first voltage and the charge storage module Store the difference of voltage, the drive module conducting, so that the first voltage end is led with the light emitting control module third end It is logical, the light-emitting component except output driving current to the pixel-driving circuit.

13. pixel compensation method according to claim 12, which is characterized in that in second stage, the 4th switch module is led Logical, the initialization voltage of the initializing signal line is exported to the first end of light-emitting component, initializes the of the light-emitting component The voltage of one end；

First end, the second end, third end of 4th switch module are respectively used to and the first grid signal wire, described The first end electrical connection of initializing signal line, the light-emitting component.