CN204288766U - A kind of image element circuit, organic EL display panel and display device - Google Patents

Abstract

The utility model discloses a pixel circuit, an organic electroluminescence display panel and a display device. In the reset and compensation stage, the charging control module of the pixel circuit conducts the data signal end with the first input end of the reset control module, The reset control module performs reset processing and reference voltage compensation processing on the control terminal and output terminal of the drive module; in the data writing phase, the charging control module writes the data signal input from the data signal terminal to the first Input terminal; in the light-emitting stage, the light-emitting control module conducts the output terminal of the driving module and the input terminal of the light-emitting device, and integrates the data signal input to the driving module and the reference voltage signal compensated to the driving module to drive the light-emitting device to emit light. The driving current for driving the light-emitting device to emit light has nothing to do with the power supply voltage signal, eliminating the influence of the attenuation of the power supply voltage signal input to the pixel circuit on the light-emitting brightness of the light-emitting device, and ensuring the display effect of the display panel.

Description

A pixel circuit, an organic electroluminescent display panel, and a display device

technical field

The utility model relates to the field of display technology, in particular to a pixel circuit, an organic electroluminescence display panel and a display device.

Background technique

With the advancement of display technology, organic light emitting display (Organic Light Emitting Diode, OLED) is one of the hot spots in the field of flat panel display research today, more and more active matrix organic light emitting diode (Active Matrix Organic Light Emitting Diode, AMOLED) Display panels have entered the market. Compared with traditional thin film transistor liquid crystal display panels (Thin Film Transistor Liquid Crystal Display, TFT LCD), AMOLED has faster response speed, higher contrast ratio and wider viewing angle.

The circuit structure of an existing AMOLED pixel circuit, as shown in FIG. 1 , includes: a first switching transistor M1, a second switching transistor M2, a third switching transistor M3, a fourth switching transistor M4, a fifth switching transistor M5, a storage capacitor C, and the light-emitting device OLED; wherein, the gate of the first switching transistor M1 is respectively connected to the source of the second switching transistor M2 and one end of the storage capacitor C, the source is connected to the first reference signal terminal VDD, and the drain is connected to the first reference signal terminal VDD. The drain of the second switching transistor M2 is connected to the source of the fifth switching transistor M5; the gate of the second switching transistor M2 is connected to the scanning signal terminal Scan; the gate of the third switching transistor M3 is connected to the scanning signal terminal Scan, and the source is connected to the scanning signal terminal Scan. It is connected to the data signal terminal Data, and its drain is connected to the drain of the fourth switching transistor M4 and the other end of the storage capacitor C respectively; the gate of the fourth switching transistor M4 is connected to the scan signal terminal Scan, and its source is connected to the second reference signal The gate of the fifth switching transistor M5 is connected to the scanning signal terminal Scan, and the drain is connected to one end of the light emitting device OLED; the other end of the light emitting device OLED is connected to the third reference signal terminal VSS.

FIG. 2 is a working timing diagram of the pixel circuit shown in FIG. 1. It can be seen from FIG. 2 that during the time period t1, the scanning signal input terminal Scan inputs a low-level signal, so the second switching transistor M2 and the third switching transistor are turned on. The fourth switching transistor M4 and the fifth switching transistor M5 are turned off, at this time, the signal on the data signal terminal Data is written into the left end of the storage capacitor C through the turned-on third switching transistor M3, that is, the voltage at point b is Vb=Vdata, The voltage at the right end of the storage capacitor C is the voltage at point a Va=VDD-Vth, Vth is the threshold voltage of the first switching transistor M1, and at the same time, because the second switching transistor M2 is turned on, the voltage at point c is equal to the voltage at point a , that is, Vc=Va=VDD-Vth, the voltage difference between the two ends of the storage capacitor C is Vb-Va=Vdata-VDD+Vth at this time; in the time period t2, the scanning signal input terminal Scan inputs a high-level signal, so The fourth switch transistor M4 and the fifth switch transistor M5 are turned on, the second switch transistor M2 and the third switch transistor M3 are turned off, and the turned-on fourth switch transistor M4 connects the second reference signal terminal Vsus to the left end of the storage capacitor C, namely b The point is turned on, so the voltage at point b becomes Vsus, the voltage at point a is Va=Vsus-Vdata+VDD-Vth, and because the second switch transistor M2 is in the cut-off state, the voltage at point c remains at VDD-Vth. The fifth switch transistor M5 which is always on conducts the drain of the first switch transistor M1 with one end of the light-emitting device OLED, so that the drain of the first switch transistor M1 outputs a driving current to the light-emitting device OLED, driving the OLED to emit light. From the above analysis, it can be seen that the t1 stage is the data signal writing stage, and the t2 stage is the light emitting stage. In the t2 stage, the driving current for the first switching transistor M1 to drive the light emitting device OLED to emit light is:

${\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; OLED</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&beta;</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Vgs</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; Vth</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&beta;</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Va</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; Vc</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; Vth</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&beta;</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Vsus</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; Vdata</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; Vth</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}$

Wherein, Vgs is the voltage difference between the gate and the source of the first switch transistor, and β is a parameter related to the process parameters and feature size of the first switch transistor M1. It can be seen from the above derivation formula that the driving current for driving the light-emitting device OLED to emit light is related to the voltage signal input from the second reference signal terminal Vsus. In a specific embodiment, the voltage signal input from the second reference signal terminal Vsus can be the first reference signal The voltage signal of the terminal VDD, that is, the power supply voltage signal, but when the power supply network that provides the power supply voltage signal for the pixel circuit transmits the power supply voltage signal from the signal source to the pixel circuit connected to it respectively through the power signal line, a voltage will appear Attenuation (IR Drop), which affects the luminance of the light-emitting device OLED, which in turn will affect the display effect of the display panel.

Therefore, how to improve the impact of the attenuation (IR Drop) of the power supply voltage signal input in the pixel circuit on the luminance of the light-emitting device OLED is a problem that those skilled in the art need to solve urgently.

Utility model content

The embodiment of the utility model provides a pixel circuit, an organic electroluminescent display panel and a display device, which are used to solve the problem in the prior art that the attenuation of the input power supply voltage signal in the pixel circuit affects the luminous brightness of the light emitting device question.

The embodiment of the utility model provides a pixel circuit, including: a charging control module, a driving module, a reset control module, a light emitting control module, and a light emitting device; wherein,

The control terminal of the charging control module is connected to the scanning signal terminal, the input terminal is connected to the data signal terminal, and the output terminal is connected to the first input terminal of the reset control module;

The control terminal of the reset control module is connected to the threshold voltage signal terminal, the second input terminal is respectively connected to the reference signal terminal and the input terminal of the driving module, the first output terminal is connected to the control terminal of the driving module, and the second input terminal is connected to the control terminal of the driving module. The two output terminals are respectively connected to the output terminal of the driving module and the input terminal of the lighting control module;

The control terminal of the light-emitting control module is connected to the light-emitting signal terminal, and the output terminal is connected to the input terminal of the light-emitting device; the output terminal of the light-emitting device is connected to the low-level signal terminal;

In the reset and compensation stage, the charge control module conducts the data signal terminal with the first input terminal of the reset control module under the control of the scan signal terminal, and the reset control module Perform reset processing and reference voltage compensation processing on the control terminal and output terminal of the driving module under the control of the threshold voltage signal terminal and the reference signal terminal; Write the data signal input from the data signal terminal to the first input terminal of the reset control module under control; in the light-emitting stage, the light-emitting control module turns on the drive under the control of the light-emitting signal terminal The output end of the module and the input end of the light emitting device drive the light emitting device to emit light.

In a possible implementation manner, in the above-mentioned pixel circuit provided by the embodiment of the present utility model, the reset control module specifically includes: a first capacitor, a second capacitor, and a first switch transistor; wherein,

The gate of the first switching transistor is connected to the threshold voltage signal terminal, the source is connected to the control terminal of the driving module, and the drain is respectively connected to the output terminal of the driving module and the input terminal of the light-emitting control module;

The first capacitor is connected between the output terminal of the charging control module and the control terminal of the driving module;

The second capacitor is connected between the reference signal terminal and the control terminal of the driving module.

In a possible implementation manner, in the above pixel circuit provided by the embodiment of the present invention, the first switch transistor is a P-type transistor.

In a possible implementation manner, in the above-mentioned pixel circuit provided by the embodiment of the present utility model, the charging control module specifically includes: a second switching transistor;

The gate of the second switching transistor is connected to the scanning signal terminal, the source is connected to the data signal terminal, and the drain is connected to the first input terminal of the reset control module.

In a possible implementation manner, in the pixel circuit provided by the embodiment of the present invention, the second switch transistor is a P-type transistor.

In a possible implementation manner, in the pixel circuit provided by the embodiment of the present invention, the driving module specifically includes: a driving transistor;

The gate of the driving transistor is connected to the first output terminal of the reset control module, the source is connected to the reference signal terminal, and the drain is respectively connected to the second output terminal of the reset control module and the light emitting The input terminals of the control module are connected.

In a possible implementation manner, in the pixel circuit provided by the embodiment of the present invention, the driving transistor is a P-type transistor.

In a possible implementation manner, in the above-mentioned pixel circuit provided by the embodiment of the present utility model, the light emission control module specifically includes: a third switch transistor;

The gate of the third switching transistor is connected to the light-emitting signal terminal, the source is respectively connected to the output terminal of the driving module and the second output terminal of the reset control module, and the drain is connected to the light-emitting device. connected to the input.

In a possible implementation manner, in the pixel circuit provided by the embodiment of the present invention, the third switch transistor is a P-type transistor.

The embodiment of the present invention provides an organic electroluminescence display panel, including the above-mentioned pixel circuit provided by the embodiment of the present invention.

The embodiment of the present invention provides a display device, including the above-mentioned organic electroluminescent display panel provided by the embodiment of the present invention.

The beneficial effects of the utility model embodiment include:

The embodiment of the utility model provides a pixel circuit, an organic electroluminescent display panel and a display device. In the reset and compensation stage, the charging control module in the pixel circuit connects the data signal terminal with the reset control terminal under the control of the scan signal terminal. The first input terminal of the module is turned on, and the reset control module performs reset processing and reference voltage compensation processing on the control terminal and output terminal of the drive module under the control of the threshold voltage signal terminal and the reference signal terminal; The control module writes the data signal input from the data signal terminal to the first input terminal of the reset control module under the control of the scanning signal terminal; in the light-emitting stage, the light-emitting control module turns on the output terminal of the drive module under the control of the light-emitting signal terminal and the input end of the light-emitting device, and finally integrate the data signal input to the driving module and the reference voltage signal compensated to the driving module to drive the light-emitting device to emit light. In this way, the driving current for driving the light-emitting device to emit light and the input to the pixel circuit The power supply voltage signal is irrelevant, eliminating the influence on the light-emitting brightness of the light-emitting device due to the attenuation of the power supply voltage signal input to the pixel circuit, thereby ensuring the display effect of the display panel.

Description of drawings

FIG. 1 is a schematic structural diagram of a pixel circuit in the prior art;

FIG. 2 is a specific working timing diagram of the pixel circuit shown in FIG. 1;

FIG. 3 is a schematic structural diagram of a pixel circuit provided by an embodiment of the present invention;

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

FIG. 5 is a specific working timing diagram of the pixel circuit shown in FIG. 4;

FIG. 6 is a schematic structural diagram of an organic electroluminescent display panel provided by an embodiment of the present invention.

Detailed ways

The specific implementation manners of the pixel circuit, the organic electroluminescent display panel and the display device provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The embodiment of the utility model provides a pixel circuit, as shown in FIG. 3 , including: a charging control module 01, a driving module 02, a reset control module 03, a light emitting control module 04, and a light emitting device 05; wherein, the charging control module The control terminal of 01 is connected to the scanning signal terminal Gate, the input terminal is connected to the data signal terminal Data, and the output terminal is connected to the first input terminal of the reset control module 03;

The control terminal of the reset control module 03 is connected to the threshold voltage signal terminal VTH, the second input terminal is connected to the reference signal terminal VDD and the input terminal of the driving module 02 respectively, the first output terminal is connected to the control terminal of the driving module 02, and the second The output terminals are respectively connected to the output terminals of the driving module 02 and the input terminals of the lighting control module 04;

The control terminal of the light-emitting control module 04 is connected to the light-emitting signal terminal EM, and the output terminal is connected to the input terminal of the light-emitting device 05; the output terminal of the light-emitting device 05 is connected to the low-level signal terminal VSS;

In the reset and compensation phase, the charging control module 01 conducts the data signal terminal Data with the first input terminal of the reset control module 03 under the control of the scan signal terminal Gate, and the reset control module 03 connects the threshold voltage signal terminal VTH and the first input terminal of the reset control module 03. Under the control of the reference signal terminal VDD, reset processing and reference voltage compensation processing are performed on the control terminal and output terminal of the drive module 02; The input data signal is written into the first input terminal of the reset control module 03; in the light-emitting stage, the light-emitting control module 04 conducts the output terminal of the drive module 02 and the input terminal of the light-emitting device 05 under the control of the light-emitting signal terminal EM , driving the light emitting device 05 to emit light.

In the above-mentioned pixel circuit provided by the embodiment of the present invention, in the reset and compensation stage, the charging control module 01 conducts the data signal terminal Data with the first input terminal of the reset control module 03 under the control of the scanning signal terminal Gate, and the The data signal input by the data signal terminal Data is input to the first input terminal of the reset module 03, and the reset control module 03 controls the control terminal and the output terminal of the driving module 02 under the control of the threshold voltage signal terminal VTH and the reference signal terminal VDD. Reset processing and reference voltage compensation processing, that is, in the reset phase, the reference signal terminal VDD inputs a low level low, and the reset control module 03 resets the control terminal and output terminal of the drive module 02. In the compensation phase, the reference signal The terminal VDD inputs a high level ELVDD, and the reset control module 03 charges the control terminal and output terminal of the drive module 02 to complete the compensation; in the data writing stage, the charging control module 01 transmits the data signal under the control of the scanning signal terminal Gate The data signal input from terminal Data is written into the first input terminal of the reset control module 03, and then the reset control module 03 writes the data signal into the control terminal of the drive module 02; Under the control of the terminal EM, the output terminal of the driving module 02 and the input terminal of the light emitting device 05 are turned on, and finally the data signal written into the driving module 02 and the reference voltage signal compensated to the driving module 02 are integrated to eliminate the power supply voltage signal, Drive the light-emitting device 05 to emit light. In this way, the driving current for driving the light-emitting device to emit light has nothing to do with the power supply voltage signal, and the influence on the light-emitting brightness of the light-emitting device due to the attenuation of the power supply voltage signal input to the pixel circuit is eliminated, thereby ensuring The display effect of the display panel.

During specific implementation, in the above-mentioned pixel circuit provided by the embodiment of the present utility model, as shown in FIG. 4 , the reset control module 03 may specifically include: a first capacitor C1, a second capacitor C2, and a first switching transistor T1; Wherein, the gate of the first switching transistor T1 is connected to the threshold voltage signal terminal VTH, the source is connected to the control terminal of the driving module 02, and the drain is respectively connected to the output terminal of the driving module 02 and the input terminal of the light-emitting control module 04; A capacitor C1 is connected between the output terminal of the charging control module 01 and the control terminal of the driving module 02 ; a second capacitor C2 is connected between the reference signal terminal VDD and the control terminal of the driving module 02 . In this way, in the reset phase, the first switching transistor T1 is turned on under the control of the threshold voltage signal terminal VTH, and the turned-on first switching transistor T1 turns on the control terminal and the output terminal of the driving module 02. At this time, the reference signal terminal input low level low, reset the control terminal and output terminal of the drive module 02; in the compensation stage, the reference signal terminal VDD input high level ELVDD, at this time the first switching transistor T1 is still in the conduction state, the conduction The first switching transistor T1 that is turned on turns on the control terminal and the output terminal of the driving module 02 to complete the compensation for the reference voltage of the control terminal and the output terminal of the driving module 02 .

In the specific implementation, in the above-mentioned pixel circuit provided by the embodiment of the present utility model, as shown in FIG. The switching transistor T1 is in a conducting state, and the conducting first switching transistor T1 conducts the control terminal and the output terminal of the driving module 02 .

During specific implementation, in the above-mentioned pixel circuit provided by the embodiment of the present utility model, as shown in FIG. 4 , the charging control module 01 may specifically include: a second switching transistor T2; The Gate is connected, the source is connected to the data signal terminal Data, and the drain is connected to the first input terminal of the reset control module 03 . In this way, in the reset phase and the compensation phase, the second switching transistor T2 is turned on under the control of the scanning signal terminal Gate, and the turned-on second switching transistor T2 connects the data signal terminal Data to the first input terminal of the reset control module 03 turn on, and then write the data signal input by the data signal terminal Data into the first input terminal of the reset control module 03; in the data writing phase, the second switching transistor T2 is still in the conducting state, and the conducting second switch The transistor T2 writes the reference voltage signal Vref input from the data signal terminal Data into the first input terminal of the reset control module 03 .

During specific implementation, in the pixel circuit provided by the embodiment of the present invention, as shown in FIG. 4 , the second switching transistor T2 is a P-type transistor. In this way, when the scan signal terminal Gate inputs a low-level signal, the second switch transistor T2 is in the conduction state, and the conduction second switch transistor T2 conducts the data signal terminal Data with the first input terminal of the reset control module 03 .

During specific implementation, in the above-mentioned pixel circuit provided by the embodiment of the present utility model, as shown in FIG. 4 , the driving module 02 may specifically include: a driving transistor D1; The output terminal is connected, the source is connected to the reference signal terminal VDD, the drain is respectively connected to the second output terminal of the reset control module 03 and the input terminal of the light emission control module 04, and the driving transistor D1 is a P-type transistor. In this way, in the reset phase, the reference signal terminal inputs a low-level signal low to reset the gate of the driving transistor D1 to ensure that the driving transistor D1 is turned on in the compensation phase to complete the compensation process.

During specific implementation, in the above-mentioned pixel circuit provided by the embodiment of the present utility model, as shown in FIG. 4 , the lighting control module 04 may specifically include: a third switching transistor T3; EM is connected, the source is respectively connected to the output terminal of the driving module 02 and the second output terminal of the reset control module 03 , and the drain is connected to the input terminal of the light emitting device 05 . In this way, in the light-emitting phase, the third switching transistor T3 is turned on under the control of the light-emitting signal terminal EM, and the turned-on third switching transistor T3 turns on the output end of the driving module 02 and the input end of the light emitter 05, so that the driving The module 02 drives the light-emitting device 05 to realize the normal light-emitting function in the light-emitting stage.

During specific implementation, in the pixel circuit provided by the embodiment of the present invention, as shown in FIG. 4 , the third switching transistor T3 is a P-type transistor. In this way, when a low-level signal is input to the light-emitting signal terminal EM, the third switch transistor T3 is in a conduction state, and the conduction of the third switch transistor T3 conducts the output terminal of the driving module 02 with the input terminal of the light-emitting device 05 .

It should be noted that the switching transistor and the driving transistor mentioned in the above-mentioned embodiments of the present utility model can be a thin film transistor (TFT, Thin Film Transistor), or a metal oxide semiconductor field effect transistor (MOS, Metal Oxide Scmiconductor). This is not limited. In specific implementation, the sources and drains of these transistors can be interchanged, and no specific distinction is made.

The working process of the pixel circuit provided by the embodiment of the present invention will be described in detail below in combination with the pixel circuit and the working sequence provided by the embodiment of the present invention. Using the pixel circuit as shown in FIG. 4 and the input and output timing diagram of FIG. 4 shown in FIG. 5 , the working process of the pixel circuit provided by the embodiment of the present invention is described. Specifically, four stages t1 to t4 in the input and output timing diagram shown in FIG. 5 are selected. In the following description, 1 represents a high-level signal, and 0 represents a low-level signal.

In the t1 stage, VDD=low, VTH=0, Gate=0, Data=DATA, EM=1. Since VTH=0 and Gate=0, the first switch transistor T1 and the second switch transistor T2 are turned on; because EM=1, the third switch transistor T3 is turned off. The turned-on first switching transistor T1 turns on the gate and drain of the driving transistor D1, and the turned-on second switching transistor T2 turns on the data signal terminal Data and one end of the first capacitor C1. At this time, the reference signal terminal VDD inputs a low-level signal low, so the gate and drain voltages of the driving transistor D1 are both low-Vth, where Vth is the threshold voltage of the driving transistor D1, then the voltage difference between the two ends of the first capacitor C1 at this time is DATA-low+Vth, and the voltage difference between the two ends of the second capacitor C2 is Vth. The t1 stage is the reset stage.

In the t2 stage, VDD=ELVDD, VTH=0, Gate=0, Data=DATA, EM=1. Since VTH=0 and Gate=0, the first switch transistor T1 and the second switch transistor T2 are turned on; because EM=1, the third switch transistor T3 is turned off. The turned-on first switching transistor T1 turns on the gate and drain of the driving transistor D1, and the turned-on second switching transistor T2 turns on the data signal terminal Data and one end of the first capacitor C1. At this time, the reference signal terminal VDD inputs a high-level signal ELVDD, so the gate of the driving transistor D1 is charged through the driving transistor D1 and the first switching transistor T1. When the gate of the driving transistor D1 is charged to ELVDD-Vth, the driving transistor D1 is turned off and ends charging. At this time, the voltage at the drain of the driving transistor D1 is also ELVDD-Vth, then the voltage difference between the two ends of the first capacitor C1 is DATA-ELVDD+Vth, and the voltage difference between the two ends of the second capacitor C2 is Vth . The t2 stage is the compensation stage.

In the t3 phase, VDD=ELVDD, VTH=1, Gate=0, Data=Vref, EM=1. Because Gate=0, the second switch transistor T2 is turned on; because VTH=1, EM=1, the first switch transistor T1 and the third switch transistor T3 are turned off. The turned-on second switching transistor T2 conducts the data signal terminal Data and one end of the first capacitor C1. At this time, the reference signal terminal VDD inputs a high-level signal ELVDD, and the data signal input from the data signal terminal Data is Vref, so the drive The voltage of the gate of the transistor D1 is ELVDD-Vth-DATA+Vref, and the voltage of the driving transistor D1 maintains the voltage ELVDD-Vth of the previous stage. The t3 stage is the data writing stage.

In the t4 stage, VDD=ELVDD, VTH=1, Gate=1, Data=0, EM=0. Because EM=0, the third switch transistor T3 is turned on; because VTH=1, Gate=1, the first switch transistor T1 and the second switch transistor T2 are turned off. The turned-on third switch transistor T3 conducts the drain of the driving transistor D1 with the input terminal of the light emitting device 05 , so that the driving transistor D1 drives the light emitting device 05 to realize the normal light emitting function. The t4 stage is the luminescence stage.

In the t4 stage, the gate voltage of the driving transistor D1 is ELVDD-Vth-DATA+Vref, the drain voltage is ELVDD-Vth, and the driving current I=K(Vgs-Vth) ² =K(Vref -DATA-Vth) ² , where K is a constant related to the process parameters and geometric dimensions of the driving transistor D1, and Vgs is the voltage difference between the gate and the source of the driving transistor D1. From the above analysis, it can be known that the conduction current of the light emitting device 05 has nothing to do with the power supply voltage signal of the reference voltage terminal VDD, thereby eliminating the influence on the luminance of the light emitting device 05 due to the attenuation of the power supply voltage signal input to the pixel circuit.

Based on the same concept of the utility model, an embodiment of the utility model provides an organic electroluminescent display panel, including the above-mentioned pixel circuit provided by the embodiment of the utility model. Since the problem-solving principle of the organic electroluminescent display panel is similar to that of the pixel circuit, the implementation of the organic electroluminescent display panel can refer to the implementation of the above-mentioned pixel circuit, and repeated descriptions will not be repeated.

During specific implementation, in the organic electroluminescence display panel provided by the embodiment of the present invention, as shown in FIG. 6 , the reference signal terminal VDD, the scanning signal terminal Gate, and the threshold voltage The signal terminal VTH and the light-emitting signal terminal EM provide corresponding control signals, and the source driver module provides data signals DATA and Vref to the data signal terminal Data respectively at different stages.

Based on the same utility model idea, the embodiment of the utility model provides a display device, which can be applied to any product or part. Since the problem-solving principle of the display device is similar to that of the organic electroluminescent display panel, the implementation of the display device can refer to the implementation of the above-mentioned organic electroluminescent display panel, and the repetition will not be repeated.

The embodiment of the utility model provides a pixel circuit, an organic electroluminescent display panel and a display device. In the reset and compensation stage, the charging control module in the pixel circuit connects the data signal terminal with the reset control terminal under the control of the scan signal terminal. The first input terminal of the module is turned on, and the reset control module performs reset processing and reference voltage compensation processing on the control terminal and output terminal of the drive module under the control of the threshold voltage signal terminal and the reference signal terminal; The control module writes the data signal input from the data signal terminal to the first input terminal of the reset control module under the control of the scanning signal terminal; in the light-emitting stage, the light-emitting control module turns on the output terminal of the drive module under the control of the light-emitting signal terminal Finally, the data signal input to the driving module is integrated with the reference voltage signal compensated to the driving module to drive the light emitting device to emit light. In this way, the driving current for driving the light emitting device to emit light is independent of the power supply voltage signal. The influence of the attenuation of the power supply voltage signal input to the pixel circuit on the light-emitting brightness of the light-emitting device is eliminated, thereby ensuring the display effect of the display panel.

Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and equivalent technologies thereof, the utility model is also intended to include these modifications and variations.

Claims (11)

1. A pixel circuit, comprising: the device comprises a charging control module, a driving module, a resetting control module, a light-emitting control module and a light-emitting device; wherein,

the control end of the charging control module is connected with the scanning signal end, the input end of the charging control module is connected with the data signal end, and the output end of the charging control module is connected with the first input end of the reset control module;

the control end of the reset control module is connected with the threshold voltage signal end, the second input end of the reset control module is respectively connected with the reference signal end and the input end of the driving module, the first output end of the reset control module is connected with the control end of the driving module, and the second output end of the reset control module is respectively connected with the output end of the driving module and the input end of the light-emitting control module;

the control end of the light-emitting control module is connected with the light-emitting signal end, and the output end of the light-emitting control module is connected with the input end of the light-emitting device; the output end of the light-emitting device is connected with a low-level signal end;

in a reset and compensation stage, the charging control module conducts the data signal terminal and a first input terminal of the reset control module under the control of the scanning signal terminal, and the reset control module conducts reset processing and reference voltage compensation processing on a control terminal and an output terminal of the driving module under the control of the threshold voltage signal terminal and the reference signal terminal; in a data writing stage, the charging control module writes a data signal input by the data signal terminal into a first input terminal of the reset control module under the control of the scanning signal terminal; in the light emitting stage, the light emitting control module conducts the output end of the driving module and the input end of the light emitting device under the control of the light emitting signal end to drive the light emitting device to emit light.

2. The pixel circuit according to claim 1, wherein the reset control module specifically comprises: a first capacitor, a second capacitor, and a first switching transistor; wherein,

the grid electrode of the first switching transistor is connected with a threshold voltage signal end, the source electrode of the first switching transistor is connected with the control end of the driving module, and the drain electrode of the first switching transistor is respectively connected with the output end of the driving module and the input end of the light-emitting control module;

the first capacitor is connected between the output end of the charging control module and the control end of the driving module;

the second capacitor is connected between the reference signal end and the control end of the driving module.

3. The pixel circuit according to claim 2, wherein the first switching transistor is a P-type transistor.

4. The pixel circuit according to claim 1, wherein the charging control module specifically comprises: a second switching transistor;

and the grid electrode of the second switch transistor is connected with the scanning signal end, the source electrode of the second switch transistor is connected with the data signal end, and the drain electrode of the second switch transistor is connected with the first input end of the reset control module.

5. The pixel circuit according to claim 4, wherein the second switching transistor is a P-type transistor.

6. The pixel circuit according to claim 1, wherein the driving module specifically comprises: a drive transistor;

the grid electrode of the driving transistor is connected with the first output end of the reset control module, the source electrode of the driving transistor is connected with the reference signal end, and the drain electrode of the driving transistor is respectively connected with the second output end of the reset control module and the input end of the light-emitting control module.

7. The pixel circuit according to claim 6, wherein the driving transistor is a P-type transistor.

8. The pixel circuit according to claim 1, wherein the light emission control module specifically comprises: a third switching transistor;

and the grid electrode of the third switching transistor is connected with the light-emitting signal end, the source electrode of the third switching transistor is respectively connected with the output end of the driving module and the second output end of the reset control module, and the drain electrode of the third switching transistor is connected with the input end of the light-emitting device.

9. The pixel circuit according to claim 8, wherein the third switching transistor is a P-type transistor.

10. An organic electroluminescent display panel comprising the pixel circuit according to any one of claims 1 to 9.

11. A display device characterized by comprising the organic electroluminescent display panel according to claim 10.