CN109559686A - Pixel circuit, driving method, electroluminescence display panel and display device - Google Patents

Abstract

The invention discloses a pixel circuit, a driving method, an electroluminescent display panel and a display device. And in the data writing stage, responding to the second scanning signal through the compensation module, providing the data signal to the second pole of the driving transistor, and responding to the third scanning signal, and conducting the grid electrode of the driving transistor with the first pole. In the light-emitting stage, the light-emitting control module responds to the light-emitting control signal to conduct the first power terminal with the first electrode of the driving transistor and conduct the second electrode of the driving transistor with the first electrode of the light-emitting device so as to drive the light-emitting device to emit light. The compensation of the threshold voltage of the driving transistor can be realized by a simple structure and a simple timing.

Description

Pixel circuit, driving method, electroluminescence display panel and display device

technical field

The present invention relates to the field of display technology, and in particular, to a pixel circuit, a driving method, an electroluminescence display panel and a display device.

Background technique

Organic Light Emitting Diode (OLED) displays have the advantages of low energy consumption, low production cost, self-illumination, wide viewing angle and fast response speed, and are one of the hot spots in the field of flat panel display research today. Among them, the design of the pixel circuit for controlling the OLED to emit light is the core technical content of the OLED display. Since OLEDs are current driven, a stable current is required to control their light emission. However, due to reasons such as process and device aging, the threshold voltage V _th of the driving transistor in the pixel circuit that drives the OLED to emit light will be uneven, which will cause the current flowing through the OLED to change, resulting in uneven display brightness, which affects the The display effect of the entire image.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a pixel circuit, a driving method, an electroluminescent display panel, and a display device, which are used to keep a stable operating current for driving a light-emitting device to emit light and improve the uniformity of image display brightness.

An embodiment of the present invention provides a pixel circuit, including: a driving transistor, an initialization module, a compensation module, a light-emitting control module, and a light-emitting device;

the initialization module is configured to provide an initialization signal to the first electrode of the driving transistor in response to the first scan signal;

The compensation module is configured to provide a data signal to the second electrode of the driving transistor in response to the second scan signal; and to conduct the gate of the driving transistor with the first electrode in response to the third scan signal ;

The light-emitting control module is configured to, in response to the light-emitting control signal, conduct the first power supply terminal with the first electrode of the driving transistor, and connect the second electrode of the driving transistor with the first electrode of the light-emitting device is turned on to drive the light-emitting device to emit light.

Optionally, in this embodiment of the present invention, the initialization module includes: a first transistor;

A gate of the first transistor is configured to receive the first scan signal, a first electrode of the first transistor is configured to receive the initialization signal, and a second electrode of the first transistor is connected to the drive The first pole of the transistor is coupled.

Optionally, in this embodiment of the present invention, the compensation module includes: a second transistor, a third transistor, and a storage capacitor;

A gate of the second transistor is configured to receive the second scan signal, a first electrode of the second transistor is configured to receive the data signal, and a second electrode of the second transistor is connected to the drive the second pole of the transistor is coupled;

The gate of the third transistor is configured to receive the third scan signal, the first electrode of the third transistor is coupled to the gate of the driving transistor, and the second electrode of the third transistor is coupled to the drive transistor. the first pole of the driving transistor is coupled;

The first terminal of the storage capacitor is coupled to the gate of the driving transistor, and the second terminal of the storage capacitor is coupled to the second power terminal or the first power terminal.

Optionally, in this embodiment of the present invention, the lighting control module includes: a fourth transistor and a fifth transistor;

The gate of the fourth transistor is configured to receive the light-emitting control signal, the first electrode of the fourth transistor is coupled to the first power supply terminal, and the second electrode of the fourth transistor is connected to the driver the first pole of the transistor is coupled;

The gate of the fifth transistor is configured to receive the light-emitting control signal, the first electrode of the fifth transistor is coupled to the second electrode of the driving transistor, and the second electrode of the fifth transistor is coupled to the drive transistor. The first pole of the light emitting device is coupled.

Optionally, in this embodiment of the present invention, the pixel circuit further includes: a sixth transistor;

The gate of the sixth transistor is configured to receive the first scan signal, the first electrode of the sixth transistor is configured to receive the reset signal, and the second electrode of the sixth transistor is connected to the light emitting device. The first pole is coupled.

Optionally, in this embodiment of the present invention, the reset signal and the initialization signal are the same signal.

Optionally, in this embodiment of the present invention, the voltage of the reset signal is lower than the voltage of the second power supply terminal.

Correspondingly, an embodiment of the present invention also provides an electroluminescent display panel, including the above pixel circuit.

Correspondingly, an embodiment of the present invention also provides a display device including the above electroluminescent display panel.

Correspondingly, an embodiment of the present invention also provides a method for driving the above pixel circuit, including:

In the initialization stage, the initialization module responds to the first scan signal and provides the initialization signal to the first electrode of the drive transistor; the compensation module responds to the third scan signal to connect the gate of the drive transistor to the first electrode of the drive transistor. extremely conductive;

In the data writing stage, the compensation module provides a data signal to the second electrode of the driving transistor in response to the second scan signal; and connects the gate of the driving transistor to the first electrode in response to the third scan signal turn on;

In the light-emitting stage, the light-emitting control module, in response to the light-emitting control signal, conducts the first power supply terminal with the first electrode of the drive transistor, and connects the second electrode of the drive transistor with the first electrode of the light-emitting device is turned on to drive the light-emitting device to emit light.

The beneficial effects of the present invention are as follows:

In the pixel circuit, the driving method, the electroluminescent display panel and the display device provided by the embodiments of the present invention, in the initialization stage, the initialization module responds to the first scan signal, provides the initialization signal to the first electrode of the driving transistor, and compensates the In response to the third scan signal, the module turns on the gate of the driving transistor and the first electrode, so that the gate and the first electrode of the driving transistor can be initialized. In the data writing stage, the compensation module provides the data signal to the second electrode of the driving transistor in response to the second scanning signal, and turns on the gate of the driving transistor and the first electrode in response to the third scanning signal, thereby The voltage of the data signal and the threshold voltage of the driving transistor can be written to the gate of the driving transistor. In the light-emitting stage, in response to the light-emitting control signal, the light-emitting control module conducts the first power supply terminal and the first electrode of the driving transistor, and conducts the second electrode of the driving transistor and the first electrode of the light-emitting device, so as to drive light-emitting The device emits light. Therefore, the above-mentioned modules can cooperate with each other to realize the compensation of the threshold voltage of the driving transistor through a simple structure and a simple timing sequence, thereby simplifying the manufacturing process, reducing the production cost and reducing the occupied area, which is conducive to high resolution design of the display panel.

Description of drawings

FIG. 1 is a schematic structural diagram of a pixel circuit provided by an embodiment of the present invention;

FIG. 2 is one of the specific structural schematic diagrams of the pixel circuit provided by the embodiment of the present invention;

3 is a signal timing diagram provided by an embodiment of the present invention;

FIG. 4 is a second schematic diagram of a specific structure of a pixel circuit provided by an embodiment of the present invention;

FIG. 5 is a third schematic diagram of a specific structure of a pixel circuit provided by an embodiment of the present invention;

6 is a flowchart of a driving method provided by an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the specific implementations of the pixel circuit, the driving method, the electroluminescent display panel and the display device provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are only used to illustrate and explain the present invention, but not to limit the present invention. And the embodiments in this application and the features in the embodiments may be combined with each other without conflict. It should be noted that the dimensions and shapes of the figures in the accompanying drawings do not reflect the actual scale, and are only intended to illustrate the content of the present invention. And the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout.

An embodiment of the present invention provides a pixel circuit, as shown in FIG. 1 , including: a driving transistor M0, an initialization module 10, a compensation module 20, a light-emitting control module 30, and a light-emitting device L;

The initialization module 10 is configured to provide the initialization signal VINIT to the first pole S of the driving transistor M0 in response to the first scan signal SCAN1;

The compensation module 20 is configured to provide the data signal DATA to the second pole D of the driving transistor M0 in response to the second scan signal SCAN2; and to connect the gate G of the driving transistor M0 to the first pole of the driving transistor M0 in response to the third scan signal SCAN3 S turns on;

The light emitting control module 30 is configured to turn on the first power supply terminal VDD with the first pole S of the driving transistor M0, and connect the second pole D of the driving transistor M0 with the first pole of the light emitting device L in response to the light emitting control signal EM On, the light-emitting device L is driven to emit light.

In the pixel circuit provided by the embodiment of the present invention, in the initialization stage, the initialization module responds to the first scan signal to provide the initialization signal to the first electrode of the driving transistor, and the compensation module responds to the third scan signal to respond to the driving transistor. The gate is conductive with the first electrode, so that the gate and the first electrode of the driving transistor can be initialized. In the data writing stage, the compensation module provides the data signal to the second electrode of the driving transistor in response to the second scanning signal, and turns on the gate of the driving transistor and the first electrode in response to the third scanning signal, thereby The voltage of the data signal and the threshold voltage of the driving transistor can be written to the gate of the driving transistor. In the light-emitting stage, in response to the light-emitting control signal, the light-emitting control module conducts the first power supply terminal and the first electrode of the driving transistor, and conducts the second electrode of the driving transistor and the first electrode of the light-emitting device, so as to drive light-emitting The device emits light. Therefore, the above-mentioned modules can cooperate with each other to realize the compensation of the threshold voltage of the driving transistor through a simple structure and a simple timing sequence, thereby simplifying the manufacturing process, reducing the production cost and reducing the occupied area, which is conducive to high resolution design of the display panel.

The present invention will be described in detail below with reference to specific embodiments. It should be noted that this embodiment is for better explanation of the present invention, but does not limit the present invention.

Embodiment 1.

During specific implementation, in this embodiment of the present invention, as shown in FIG. 1 , the driving transistor M0 may be a P-type transistor; wherein, the first pole S of the driving transistor M0 may be used as its source, and the second pole of the driving transistor M0 D can be used as its drain. And when the driving transistor M0 is in a saturated state, the current flows from the source of the driving transistor M0 to the drain thereof. Of course, in the embodiment of the present invention, only the driving transistor is a P-type transistor for illustration. For the case where the driving transistor is an N-type transistor, the design principle is the same as that of the present invention, which also belongs to the protection scope of the present invention.

During specific implementation, in the embodiment of the present invention, as shown in FIG. 1 , the second pole of the light emitting device L is coupled to the second power supply terminal VSS. Further, the voltage _Vdd of the signal of the first power supply terminal VDD is generally positive, the voltage _Vinit of the initialization signal VINIT is generally negative, and the voltage _Vss of the signal of the second power supply terminal VSS is generally the ground voltage or a negative value. . In practical applications, the above voltages need to be designed and determined according to the actual application environment, which is not limited here.

The light-emitting device generally realizes light emission under the action of the current when the driving transistor is in a saturated state. In addition, a general light-emitting device has a turn-on voltage, and emits light when the voltage across the light-emitting device is greater than or equal to the turn-on voltage. During specific implementation, in the embodiment of the present invention, the light-emitting device may include: an electroluminescent diode; wherein the anode of the electroluminescent diode is used as the first electrode of the light-emitting device, and the cathode of the electroluminescent diode is used as the second electrode of the light-emitting device. pole. Specifically, the electroluminescent diodes may include: OLEDs, or quantum dot light-emitting diodes (Quantum Dot Light Emitting Diodes, QLED).

During specific implementation, in this embodiment of the present invention, as shown in FIG. 2 , the initialization module 10 may include: a first transistor M1; wherein the gate of the first transistor M1 is configured to receive the first scan signal SCAN1, the first The first electrode of the transistor M1 is configured to receive the initialization signal VINIT, and the second electrode of the first transistor M1 is coupled to the first electrode S of the driving transistor M0.

During specific implementation, in the embodiment of the present invention, when the first transistor M1 is in a conducting state under the control of the first scan signal SCAN1, the initialization signal VINIT may be provided to the first electrode of the driving transistor M0.

During specific implementation, in this embodiment of the present invention, as shown in FIG. 2 , the compensation module 20 may include: a second transistor M2, a third transistor M3, and a storage capacitor CST;

The gate of the second transistor M2 is configured to receive the second scan signal SCAN2, the first electrode of the second transistor M2 is configured to receive the data signal DATA, the second electrode of the second transistor M2 is connected to the second electrode D of the driving transistor M0 coupling;

The gate of the third transistor M3 is configured to receive the third scan signal SCAN3, the first pole of the third transistor M3 is coupled to the gate G of the driving transistor M0, and the second pole of the third transistor M3 is coupled to the first pole of the driving transistor M0 One pole S coupling;

The first terminal of the storage capacitor CST is coupled to the gate G of the driving transistor M0, and the second terminal of the storage capacitor CST is coupled to the second power terminal VSS. Alternatively, the second terminal of the storage capacitor CST is coupled to the first power terminal VDD.

During specific implementation, in the embodiment of the present invention, when the second transistor M2 is in a conducting state under the control of the second scan signal SCAN2, the data signal DATA can be provided to the second pole D of the driving transistor M0. When the third transistor M3 is turned on under the control of the third scan signal SCAN3, the gate G of the driving transistor M0 can be turned on with the first electrode S, so that the driving transistor M0 is in a diode-connected state. The storage capacitor CST may store the voltage input to the gate G of the driving transistor M0.

During specific implementation, in this embodiment of the present invention, as shown in FIG. 2 , the lighting control module may include: a fourth transistor M4 and a fifth transistor M5;

The gate of the fourth transistor M4 is configured to receive the light-emitting control signal EM, the first electrode of the fourth transistor M4 is coupled to the first power supply terminal VDD, and the second electrode of the fourth transistor M4 is connected to the first electrode S of the driving transistor M0 coupling;

The gate of the fifth transistor M5 is configured to receive the light emission control signal EM, the first electrode of the fifth transistor M5 is coupled to the second electrode D of the driving transistor M0, and the second electrode of the fifth transistor M5 is coupled to the first electrode of the light emitting device L. One pole coupling.

During specific implementation, in the embodiment of the present invention, when the fourth transistor M4 is in a conducting state under the control of the light-emitting control signal EM, the first power supply terminal VDD and the first pole S of the driving transistor M0 can be turned on, so as to The signal of the first power supply terminal VDD is supplied to the first pole S of the driving transistor M0. When the fifth transistor M5 is in a conducting state under the control of the light-emitting control signal EM, it can conduct the second electrode D of the driving transistor M0 with the first electrode of the light-emitting device L, so as to provide the current generated by the driving transistor M0 to the light-emitting device. The device L drives the light-emitting device L to emit light.

The above is only an example to illustrate the specific structure of each module in the pixel circuit provided by the embodiment of the present invention. During specific implementation, the specific structure of each of the above-mentioned modules is not limited to the above-mentioned structure provided by the embodiment of the present invention, and may also be known by those skilled in the art. Other structures are not limited here.

Further, in order to simplify the manufacturing process, in the specific implementation, in the embodiment of the present invention, as shown in FIG. 2 , when the driving transistor is a P-type transistor, the first to fifth transistors are all P-type transistors. Of course, when the driving transistors are N-type transistors, the first to fifth transistors are all N-type transistors.

Further, in specific implementation, the P-type transistor is turned off under the action of a high level and turned on under the action of a low level; the N-type transistor is turned on under the action of a high level and turned off under the action of a low level.

It should be noted that, in the embodiment of the present invention, the above transistor may be a thin film transistor (TFT, ThinFilm Transistor) or a metal oxide semiconductor field effect transistor (MOS, Metal OxideScmiconductor), which is not limited herein. In a specific implementation, the first electrode of the transistor can be used as its source electrode, and the second electrode can be used as its drain electrode; or, the first electrode can be used as its drain electrode and the second electrode as its source electrode, which is not specifically distinguished here.

Taking the pixel circuit shown in FIG. 2 as an example, the working process of the pixel circuit provided by the embodiment of the present invention will be described below with reference to the signal timing diagram shown in FIG. 3 . In the following description, 1 represents a high level, and 0 represents a low level. It should be noted that 1 and 0 are logic levels, which are only for better explanation of the specific working process of the embodiment of the present invention, not for The voltage applied to the gate of each transistor during specific implementation.

One frame time may include: an initialization phase T1, a data writing phase T2, and a light-emitting phase T3.

In the initialization phase T1, SCNA1=0, SCNA2=1, SCNA3=0, EM=1.

Since SCNA2=1, the second transistor M2 is turned off. Since EM=1, both the fourth transistor M4 and the fifth transistor M5 are turned off. Since SCNA1=0, the first transistor M1 is turned on, and since SCNA3=0, the third transistor M3 is turned on. Therefore, the initialization signal VINIT can be supplied to the first electrode S and the gate G of the driving transistor M0, thereby initializing the gate G and the first electrode S of the driving transistor M0.

In the data writing phase T2, SCNA1=1, SCNA2=0, SCNA3=0, EM=1.

Since SCNA1=1, the first transistor M1 is turned off. Since EM=1, both the fourth transistor M4 and the fifth transistor M5 are turned off. Since SCNA3=0, the third transistor M3 is turned on, and the gate G and the first electrode S of the driving transistor M0 are turned on to form a diode connection. Since SCNA2=0, the second transistor M2 is turned on to supply the data signal DATA to the second pole D of the driving transistor M0. The voltage V _DATA of the data signal DATA charges the gate G of the driving transistor M0 in the form of a diode until the voltage of the gate G of the driving transistor M0 becomes: V _DATA +V _th and turns off. Then, the voltage difference across the storage capacitor CST is V _DATA +V _th -V _ss .

In the light-emitting stage T3, SCNA1=1, SCNA2=1, SCNA3=1, EM=0.

Since SCNA1=1, the first transistor M1 is turned off. Since SCNA2=1, the second transistor M2 is turned off. Since SCNA3=1, the third transistor M3 is turned off. Since EM=0, both the fourth transistor M4 and the fifth transistor M5 are turned on. The turned-on fourth transistor M4 provides the signal of the first power supply terminal VDD to the first pole S of the driving transistor M0, so that the voltage of the first pole S of the driving transistor M0 is V _dd . Due to the action of the storage capacitor CST, the voltage of the gate G of the driving transistor M0 is: V _DATA +V _th . According to the current characteristics of the saturation state, the current IL flowing through the driving transistor M0 and used for driving the light-emitting device _L to emit light satisfies the formula: _IL =β(V _GS −V _th ) ² =β(V _DATA −V _dd ) ² ; in, μn _is the electron mobility of the driving transistor M0, _Cox is the gate oxide capacitance per unit area, is the aspect ratio of the driving transistor M0, and V _GS is the voltage difference between the gate G and the first electrode S of the driving transistor M0. Therefore, the current IL of the driving transistor M0 for driving the light-emitting device _L to emit light is only related to the voltage V DATA of the data signal _DATA and the voltage V _dd of the first power supply terminal VDD, but has nothing to do with the threshold voltage V _th of the driving transistor M0. The process of driving transistor M0 and the influence of threshold voltage V _th drift caused by long-term operation on the current driving the light emitting device L, so that the current driving the light emitting device L to emit light remains stable, thereby ensuring the normal operation of the light emitting device L.

In addition, the gate of the driving transistor M0 in the existing pixel circuit is not only coupled with the transistor for compensating the threshold voltage _Vth , but also coupled with the reset circuit, so that in the light-emitting phase, the gate of the driving transistor M0 passes through The coupled transistor generates a large leakage current, which causes the gate voltage of the driving transistor M0 to be attenuated, thereby causing the luminance to be attenuated during the display process. In the pixel circuit in this embodiment, the transistor coupled to the gate G of the driving transistor M0 has only the third transistor M3 for compensating the threshold voltage V _th , so the gate G of the driving transistor M0 can be reduced during the display period. The leakage current of the coupled transistor can reduce the brightness attenuation caused by the voltage attenuation of the gate G of the driving transistor M0 during the display process, and improve the brightness stability.

Embodiment two,

Schematic diagrams of the specific structure of the pixel circuit corresponding to this embodiment are shown in FIG. 4 and FIG. 5 , which are modified from the implementation in the first embodiment. Only the differences between this embodiment and the first embodiment will be described below, and the similarities will not be repeated here.

During specific implementation, in this embodiment of the present invention, as shown in FIG. 4 and FIG. 5 , the pixel circuit may further include: a sixth transistor M6 . Wherein, as shown in FIG. 4 , the gate of the sixth transistor M6 is configured to receive the first scan signal SCAN1, the first electrode of the sixth transistor M6 is configured to receive the reset signal VRE, and the second electrode of the sixth transistor M6 is configured to receive the reset signal VRE. The first pole of the light emitting device L is coupled.

In the specific implementation, in the embodiment of the present invention, when the sixth transistor M6 is in a conducting state under the control of the first scan signal SCAN1, the reset signal VRE can be provided to the first pole of the light-emitting device L, so as to provide the light-emitting device with the reset signal VRE. The first pole of L is reset.

Generally, when a light-emitting device (such as OLED) emits light under the action of a forward DC driving voltage, an internal electric field is formed in the light-emitting layer due to the directional movement of impurity ions in the light-emitting layer, thereby reducing the effective electric field for carrier injection. This leads to an increase in the turn-on voltage of the light-emitting device, causes degradation of the light-emitting device, and reduces the working life of the light-emitting device. In order to improve the above problem, in specific implementation, in this embodiment of the present invention, the voltage of the reset signal VRE is lower than the voltage of the second power supply terminal VSS. In this way, the light-emitting device can be in a reverse bias state, which can offset the internal electric field formed by the directional movement of impurity ions in the light-emitting layer during display, thereby restoring the normal characteristics of the light-emitting device and slowing down the aging phenomenon of the light-emitting device.

Further, in order to reduce the setting of the signal lines and save the wiring space, in the specific implementation, in this embodiment of the present invention, the reset signal and the initialization signal may be set to the same signal. As shown in FIG. 5 , the first electrode of the sixth transistor M6 may directly receive the initialization signal VINIT. That is, the voltage of the initialization signal VINIT is lower than the voltage of the second power supply terminal VSS.

Taking the pixel circuit shown in FIG. 5 as an example, the working process of the pixel circuit provided by the embodiment of the present invention will be described below with reference to the signal timing diagram shown in FIG. 3 . In the following description, 1 represents a high level, and 0 represents a low level. It should be noted that 1 and 0 are logic levels, which are only for better explanation of the specific working process of the embodiment of the present invention, not for The voltage applied to the gate of each transistor during specific implementation.

One frame time may include: an initialization phase T1, a data writing phase T2, and a light-emitting phase T3.

In the initialization stage T1, since SCNA1=0, the sixth transistor M6 is also turned on to provide the initialization signal VINIT to the first pole of the light-emitting device L, so that the light-emitting device L is in a reverse bias state, which can offset the display period Due to the internal electric field formed by the directional movement of impurity ions in the light-emitting layer, the normal characteristics of the light-emitting device can be restored and the aging phenomenon of the light-emitting device can be slowed down. The rest of the working process is basically the same as that of the first embodiment, and will not be repeated here.

In the data writing stage T2, since SCNA1=1, the sixth transistor M6 is turned off. The rest of the working process is basically the same as that of the first embodiment, and will not be repeated here.

In the light-emitting stage T3, since SCNA1=1, the sixth transistor M6 is turned off. The rest of the working process is basically the same as that of the first embodiment, and will not be repeated here.

Based on the same inventive concept, an embodiment of the present invention also provides a driving method for the above pixel circuit. As shown in FIG. 6 , a frame time may include an initialization phase, a data writing phase, and a light-emitting phase. Specifically, the following steps may be included:

S601. In the initialization stage, the initialization module responds to the first scan signal, and provides the initialization signal to the first electrode of the drive transistor; the compensation module responds to the third scan signal, and conducts the gate of the drive transistor with the first electrode;

S602, in the data writing stage, the compensation module provides the data signal to the second electrode of the driving transistor in response to the second scanning signal; and conducts the gate of the driving transistor with the first electrode in response to the third scanning signal;

S603. In the light-emitting stage, the light-emitting control module, in response to the light-emitting control signal, conducts the first power supply terminal and the first electrode of the driving transistor, and conducts the second electrode of the driving transistor and the first electrode of the light-emitting device to drive the light-emitting device. glow.

During specific implementation, in the embodiment of the present invention, in the initialization stage, the sixth transistor responds to the first scan signal, and sends the reset signal to the first electrode of the light emitting device.

The driving principle and specific implementation of the driving method of the pixel circuit are the same as those of the above-mentioned pixel circuit embodiments. Therefore, the driving method of the pixel circuit can be implemented with reference to the specific implementation of the pixel circuit in the above-mentioned embodiment. , and will not be repeated here.

Based on the same inventive concept, an embodiment of the present invention further provides an electroluminescent display panel, which includes any one of the above-mentioned pixel circuits provided by the embodiment of the present invention. The principle of solving the problem of the electroluminescent display panel is similar to that of the aforementioned pixel circuit. Therefore, the implementation of the electroluminescent display panel can refer to the implementation of the aforementioned pixel circuit, and the repetition will not be repeated here.

Based on the same inventive concept, an embodiment of the present invention further provides a display device, including the electroluminescent display panel provided by the embodiment of the present invention. The problem-solving principle of the display device is similar to that of the aforementioned electroluminescent display panel, so the implementation of the display device can refer to the aforementioned implementation of the electroluminescent display panel, and the repetition will not be repeated here.

During specific implementation, as shown in FIG. 7 , the display device provided by the embodiment of the present invention may be a mobile phone. Of course, the display device may also be any product or component that has a display function, such as a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, and a navigator. Other essential components of the display device should be understood by those of ordinary skill in the art, and will not be repeated here, nor should it be regarded as a limitation of the present invention.

In the pixel circuit, the driving method, the electroluminescent display panel and the display device provided by the embodiments of the present invention, in the initialization stage, the initialization module responds to the first scan signal, provides the initialization signal to the first electrode of the driving transistor, and compensates the In response to the third scan signal, the module turns on the gate of the driving transistor and the first electrode, so that the gate and the first electrode of the driving transistor can be initialized. In the data writing stage, the compensation module provides the data signal to the second electrode of the driving transistor in response to the second scanning signal, and turns on the gate of the driving transistor and the first electrode in response to the third scanning signal, thereby The voltage of the data signal and the threshold voltage of the driving transistor can be written to the gate of the driving transistor. In the light-emitting stage, in response to the light-emitting control signal, the light-emitting control module conducts the first power supply terminal and the first electrode of the driving transistor, and conducts the second electrode of the driving transistor and the first electrode of the light-emitting device, so as to drive light-emitting The device emits light. Therefore, the above-mentioned modules can cooperate with each other to realize the compensation of the threshold voltage of the driving transistor through a simple structure and a simple timing sequence, thereby simplifying the manufacturing process, reducing the production cost and reducing the occupied area, which is conducive to high resolution design of the display panel.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (10)

1. A pixel circuit, comprising: a driving transistor, an initialization module, a compensation module, a light-emitting control module, and a light-emitting device; the initialization module is configured to provide an initialization signal to the first electrode of the driving transistor in response to the first scan signal; The compensation module is configured to provide a data signal to the second electrode of the driving transistor in response to the second scan signal; and to conduct the gate of the driving transistor with the first electrode in response to the third scan signal ; The light-emitting control module is configured to, in response to the light-emitting control signal, conduct the first power supply terminal with the first electrode of the driving transistor, and connect the second electrode of the driving transistor with the first electrode of the light-emitting device is turned on to drive the light-emitting device to emit light. 2. The pixel circuit of claim 1, wherein the initialization module comprises: a first transistor; A gate of the first transistor is configured to receive the first scan signal, a first electrode of the first transistor is configured to receive the initialization signal, and a second electrode of the first transistor is connected to the drive The first pole of the transistor is coupled. 3. The pixel circuit of claim 1, wherein the compensation module comprises: a second transistor, a third transistor and a storage capacitor; A gate of the second transistor is configured to receive the second scan signal, a first electrode of the second transistor is configured to receive the data signal, and a second electrode of the second transistor is connected to the drive the second pole of the transistor is coupled; The gate of the third transistor is configured to receive the third scan signal, the first electrode of the third transistor is coupled to the gate of the driving transistor, and the second electrode of the third transistor is coupled to the drive transistor. the first pole of the driving transistor is coupled; The first terminal of the storage capacitor is coupled to the gate of the driving transistor, and the second terminal of the storage capacitor is coupled to the second power terminal or the first power terminal. 4. The pixel circuit of claim 1, wherein the light emission control module comprises: a fourth transistor and a fifth transistor; The gate of the fourth transistor is configured to receive the light-emitting control signal, the first electrode of the fourth transistor is coupled to the first power supply terminal, and the second electrode of the fourth transistor is connected to the driver the first pole of the transistor is coupled; The gate of the fifth transistor is configured to receive the light-emitting control signal, the first electrode of the fifth transistor is coupled to the second electrode of the driving transistor, and the second electrode of the fifth transistor is coupled to the drive transistor. The first pole of the light emitting device is coupled. 5. The pixel circuit according to any one of claims 1-4, wherein the pixel circuit further comprises: a sixth transistor; The gate of the sixth transistor is configured to receive the first scan signal, the first electrode of the sixth transistor is configured to receive the reset signal, and the second electrode of the sixth transistor is connected to the light emitting device. The first pole is coupled. 6. The pixel circuit of claim 5, wherein the reset signal and the initialization signal are the same signal. 7. The pixel circuit of claim 5, wherein the voltage of the reset signal is lower than the voltage of the second power supply terminal. 8. An electroluminescent display panel, characterized in that it comprises the pixel circuit according to any one of claims 1-7. 9. A display device, comprising the electroluminescent display panel according to claim 8. 10. A method for driving a pixel circuit according to any one of claims 1-7, characterized in that, comprising: In the initialization stage, the initialization module responds to the first scan signal and provides the initialization signal to the first electrode of the drive transistor; the compensation module responds to the third scan signal to connect the gate of the drive transistor to the first electrode of the drive transistor. very conductive; In the data writing stage, the compensation module provides a data signal to the second electrode of the driving transistor in response to the second scan signal; and connects the gate of the driving transistor to the first electrode in response to the third scan signal turn on; In the light-emitting stage, the light-emitting control module, in response to the light-emitting control signal, conducts the first power supply terminal with the first electrode of the drive transistor, and connects the second electrode of the drive transistor with the first electrode of the light-emitting device is turned on to drive the light-emitting device to emit light.