CN108847183B - Pixel driving circuit and display panel - Google Patents

Pixel driving circuit and display panel Download PDF

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Publication number
CN108847183B
CN108847183B CN201810725978.2A CN201810725978A CN108847183B CN 108847183 B CN108847183 B CN 108847183B CN 201810725978 A CN201810725978 A CN 201810725978A CN 108847183 B CN108847183 B CN 108847183B
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voltage
transistor
node
input terminal
input
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CN201810725978.2A
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Chinese (zh)
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CN108847183A (en
Inventor
邓宇帆
许神贤
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深圳市华星光电半导体显示技术有限公司
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Priority to CN201810725978.2A priority Critical patent/CN108847183B/en
Publication of CN108847183A publication Critical patent/CN108847183A/en
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3266Details of drivers for scan electrodes

Abstract

The pixel driving circuit and the display panel provided by the invention comprise a first input module, a second input module, a driving module, a light emitting diode, a first capacitor and a second capacitor, and the potential of a first node is raised under the control of a second scanning signal at a second scanning signal input end through the capacitive coupling effect, so that the gate-drain voltage of a thin film transistor is improved, and the display quality of the display panel is improved.

Description

Pixel driving circuit and display panel

Technical Field

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

Background

The Organic light emitting display panel displays images by using Organic Light Emitting Diodes (OLEDs), is an active light emitting time-of-love panel, has a display mode different from that of a conventional Thin Film Transistor display panel (TFT-LCD), does not need a backlight, and has advantages of high contrast, fast response speed, light weight, and the like. Therefore, the organic light emitting display panel is known as a new generation display panel that can replace the thin film transistor display panel.

According to the driving method, the Organic light Emitting Display panel is divided into a Passive Matrix Organic light Emitting Display Panel (PMOLED) and an Active Matrix Organic light Emitting Display panel (AMOLED), which are also called Active Matrix Organic light Emitting Display panels.

The active matrix organic light emitting display panel realizes a display effect by controlling a current flowing through a light emitting diode through a thin film transistor, however, the threshold voltage of the thin film transistor is deviated due to the influence of factors such as illumination, source and drain voltage stress and the like in the use process of the thin film transistor, so that the current flowing through the light emitting diode is influenced, and the display of the display panel is uneven.

Disclosure of Invention

The invention provides a pixel driving circuit and a display panel, which can improve the grid-drain voltage of a thin film transistor and further improve the display quality of the display panel.

The present invention provides a pixel driving circuit, comprising: the circuit comprises a first input module, a second input module, a driving module, a light emitting diode, a first capacitor and a second capacitor;

the first input module is connected with a first scanning signal input end, a data signal input end, a second voltage input end, a first node and a second node, and is used for pulling the voltage of the first node to be level with the voltage of the data signal input end and pulling the voltage of the second node to be level with the voltage of the second voltage input end under the control of a first scanning signal of the first scanning signal input end;

the second input module is connected with a second scanning signal input end, a third voltage input end and the second node, and is used for aligning the voltage of the second node with the voltage of the third voltage input end under the control of a second scanning signal of the second scanning signal input end;

the driving module is connected with the first node, a first voltage input end and the anode of the light-emitting diode, the cathode of the light-emitting diode is connected with the second voltage input end, and the driving module is used for driving the light-emitting diode to emit light under the control of the voltage of the first node;

a first pole of the first capacitor is connected with the first node, and a second pole of the first capacitor is connected with the second node; the first pole of the second capacitor is connected to the first voltage input terminal, and the second pole of the second capacitor is connected to the first node.

In the pixel driving circuit of the present invention, the first input block includes a first transistor and a third transistor;

a first end of the first transistor is connected with the data signal input end, a second end of the first transistor is connected with the first node, and a grid electrode of the first transistor is connected with the first scanning signal input end;

a first end of the third transistor is connected to the second voltage input end, a second end of the third transistor is connected to the second node, and a gate of the third transistor is connected to the first scan signal input end.

In the pixel driving circuit of the present invention, the second input module includes: a fourth transistor;

a first end of the fourth transistor is connected to the third voltage input end, a second end of the fourth transistor is connected to the second node, and a gate of the fourth transistor is connected to the second scan signal input end.

In the pixel driving circuit of the present invention, the driving module includes: a second transistor;

the first end of the second transistor is connected with the first voltage input end, the second end of the second transistor is connected with the anode of the light emitting diode, and the grid electrode of the second transistor is connected with the first node.

In the pixel driving circuit of the invention, each transistor is an NMOS transistor.

In the pixel driving circuit of the present invention, the first voltage input terminal and the second voltage input terminal are used for providing a driving voltage of the light emitting diode, and the third voltage input terminal is used for providing a reference voltage.

In the pixel driving circuit of the present invention, a voltage value of the third voltage input terminal is greater than a voltage value of the second voltage input terminal.

In the pixel driving circuit of the present invention, the driving timing of the pixel driving circuit includes: a first time period and a second time period;

in the first period, a first scan signal at the first scan signal input terminal is at a high level, a second scan signal at the second scan signal input terminal is at a low level, the first transistor and the third transistor are turned on, the fourth transistor is turned off, a voltage at the first node is aligned with a voltage at the data signal input terminal, and a voltage at the second node is aligned with a voltage at the second voltage input terminal;

in the second time period, the first scan signal at the first scan signal input terminal is at a low level, the second scan signal at the second scan signal input terminal is at a high level, the first transistor and the third transistor are turned off, the fourth transistor is turned on, the voltage at the second node is leveled with the voltage at the third voltage input terminal, and due to capacitive coupling, the potential at the first node is raised, so that the second transistor is turned on to drive the light emitting diode to emit light.

In the pixel driving circuit of the present invention, the voltage at which the first node is raised:wherein, VdataIs the voltage at the data signal input terminal, VrefC1 is the voltage of the third voltage input terminal, Cst is the capacitance of the first capacitor, and OCSS is the voltage of the second voltage input terminal.

The invention also provides a display panel which comprises the pixel driving circuit.

The invention has the beneficial effects that: the pixel driving circuit and the display panel provided by the invention comprise a first input module, a second input module, a driving module, a light emitting diode, a first capacitor and a second capacitor, and the potential of a first node is raised under the control of a second scanning signal at a second scanning signal input end through the capacitive coupling effect, so that the gate-drain voltage of a thin film transistor is improved, and the display quality of the display panel is improved.

Drawings

In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention;

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

fig. 3 is a driving timing diagram of a pixel driving circuit according to an embodiment of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The transistors used in all embodiments of the present invention may be thin film transistors or field effect transistors or other devices having the same characteristics, and the transistors used in embodiments of the present invention are mainly switching transistors depending on the role in the circuit. Since the source and drain of the switching transistor used herein are symmetrical, the source and drain may be interchanged. In the embodiment of the present invention, in order to distinguish two polarities of a transistor except for a gate, a source thereof is referred to as a first terminal, and a drain thereof is referred to as a second terminal. In the form shown in the drawing, the transistor is defined such that the middle terminal is a gate, the input signal terminal is a source, and the output signal terminal is a drain. In addition, the switching transistor used in the embodiment of the present invention is turned on when the gate is at a high level and turned off when the gate is at a low level.

It should be noted that the words "first", "second", and the like in this application are used merely to distinguish the same items or similar items having substantially the same functions and actions, and the words "first", "second", and the like are not limited in number or execution order.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the invention. As shown in fig. 1, an embodiment of the invention provides a pixel driving circuit, which includes: the driving circuit includes a first input module 101, a second input module 102, a driving module 103, a light emitting diode OLED, a first capacitor C1, and a second capacitor Cst;

the first input module 101 is connected to the first scan signal input terminal Gate N, the data signal input terminal, the second voltage input terminal OVSS terminal, the first node a and the second node B, and configured to level the voltage of the first node a with the voltage of the data signal input terminal and level the voltage of the second node B with the voltage of the second voltage input terminal OVSS under the control of the first scan signal input terminal Gate N;

the second input module 102 is connected to the first scan signal input terminal Gate N +1, the third voltage input terminal Vref, and the second node B, and configured to level a voltage of the second node B with a voltage of the third voltage input terminal Vref under the control of a second scan signal of the first scan signal input terminal Gate N + 1;

the driving module 103 is connected to the first node a, the first voltage input terminal OVDD and the anode of the light emitting diode OLED, the cathode of the light emitting diode OLED is connected to the second voltage input terminal OVSS, and the driving module 103 is configured to drive the light emitting diode OLED to emit light under the control of the voltage of the first node a;

a first pole of the first capacitor C1 is connected to the first node A, and a second pole of the first capacitor C1 is connected to the second node B; a first pole of the second capacitor Cst is connected to the first voltage input terminal OVDD and a second pole of the second capacitor Cst is connected to the first node a.

It should be noted that, in the above embodiments, the number of signal terminals in the GOA circuit can be reduced by sharing one signal terminal by a plurality of modules, and of course, the modules may also be connected to different signal terminals respectively as long as the signal terminals can provide similar signals.

Referring to fig. 2, fig. 2 is a circuit diagram of a pixel driving circuit according to an embodiment of the invention. Specifically, the first input block 101 includes a first transistor T1 and a third transistor T3; a first terminal of the first transistor T1 is connected to the data signal input terminal, a second terminal of the first transistor T1 is connected to the first node a, and a Gate of the first transistor T1 is connected to the first scan signal input terminal Gate N; a first terminal of the third transistor T3 is connected to the second voltage input terminal OVSS, a second terminal of the third transistor T3 is connected to the second node B, and a Gate of the third transistor T3 is connected to the first scan signal input terminal Gate N.

The second input module 102 includes: a fourth transistor T4; a first terminal of the fourth transistor T4 is connected to the third voltage input terminal Vref, a second terminal of the fourth transistor T4 is connected to the second node B, and a Gate of the fourth transistor T4 is connected to the first scan signal input terminal Gate N + 1.

The driving module 103 includes: a second transistor T2; a first terminal of the second transistor T2 is connected to the first voltage input terminal OVDD, a second terminal of the second transistor T2 is connected to the anode of the light emitting diode OLED, and a gate of the second transistor T2 is connected to the first node a.

The first voltage input terminal OVDD and the second voltage input terminal OVSS are used for providing a driving voltage of the light emitting diode OLED, and the third voltage input terminal Vref is used for providing a reference voltage. The voltage value of the third voltage input terminal Vref is greater than the voltage value of the second voltage input terminal OVSS.

Furthermore, each of the transistors in the embodiment of the present invention is an NMOS transistor, that is, the first transistor T1T1, the second transistor T2T2, the third transistor T3T3, and the fourth transistor T4T4 are NMOS transistors, and the NMOS transistors are turned on when the gate is at a high level and turned off when the gate is at a low level.

Referring to fig. 3, fig. 3 is a driving timing diagram of a pixel driving circuit according to an embodiment of the invention. As shown in fig. 3, the driving sequence of the pixel driving circuit according to the embodiment of the present invention includes: a first time period t1, and a second time period t 2.

In the first period, the first scan signal at the first scan signal input terminal Gate N is at a high level, the second scan signal at the first scan signal input terminal Gate N +1 is at a low level, the first transistor T1 and the third transistor T3 are turned on, the fourth transistor T4 is turned off, and the voltage V at the first node a is at a high levelAAnd is pulled to be level with the voltage Vdata of the data signal input terminal, and the voltage of the second node B is pulled to be level with the voltage of the second voltage input terminal OVSS.

In the second time period, the first scan signal at the first scan signal input terminal Gate N is at a low level, the second scan signal at the first scan signal input terminal Gate N +1 is at a high level, the first transistor T1 and the third transistor T3 are turned off, the fourth transistor T4 is turned on, the voltage at the second node B is aligned with the voltage at the third voltage input terminal Vref, and due to the capacitive coupling, the potential at the first node a is raised, so that the second transistor T2 is turned on to drive the light emitting diode OLED to emit light.

Specifically, the voltage at the first node a after being boosted:wherein, VdataIs the voltage at the data signal input terminal, VrefThe voltage at the third voltage input terminal Vref is C1, which is the capacitance of the first capacitor C1, Cst is the capacitance of the second capacitor Cst, and OCSS is the voltage at the second voltage input terminal OVSS.

The pixel driving circuit provided by the invention comprises a first input module 101, a second input module 102, a driving module 103, a light emitting diode (OLED), a first capacitor C1 and a second capacitor Cst, wherein under the control of a second scanning signal of a first scanning signal input end Gate N +1, the potential of a first node A is raised through the capacitive coupling effect, so that the Gate-drain voltage of a thin film transistor is increased, and the display quality of a display panel is further improved.

An embodiment of the present invention further provides a display panel, which includes the pixel driving circuit described above, and the description of the pixel driving circuit may be specifically referred to above, which is not repeated herein.

The pixel driving circuit and the display panel provided by the invention comprise a first input module 101, a second input module 102, a driving module 103, a light emitting diode OLED, a first capacitor C1 and a second capacitor Cst, and the electric potential of a first node A is raised through the capacitive coupling effect under the control of a second scanning signal of a first scanning signal input end Gate N +1, so that the Gate-drain voltage of a thin film transistor is increased, and the display quality of the display panel is further improved.

In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.

Claims (7)

1. A pixel driving circuit, comprising: the circuit comprises a first input module, a second input module, a driving module, a light emitting diode, a first capacitor and a second capacitor;
the first input module is connected with a first scanning signal input end, a data signal input end, a second voltage input end, a first node and a second node, and is used for pulling the voltage of the first node to be level with the voltage of the data signal input end and pulling the voltage of the second node to be level with the voltage of the second voltage input end under the control of a first scanning signal of the first scanning signal input end;
the second input module is connected with a second scanning signal input end, a third voltage input end and the second node, and is used for aligning the voltage of the second node with the voltage of the third voltage input end under the control of a second scanning signal of the second scanning signal input end;
the driving module is connected with the first node, a first voltage input end and the anode of the light-emitting diode, the cathode of the light-emitting diode is connected with the second voltage input end, and the driving module is used for driving the light-emitting diode to emit light under the control of the voltage of the first node;
a first pole of the first capacitor is connected with the first node, and a second pole of the first capacitor is connected with the second node; a first pole of the second capacitor is connected with the first voltage input end, and a second pole of the second capacitor is connected with the first node;
the first input module comprises a first transistor and a third transistor;
a first end of the first transistor is connected with the data signal input end, a second end of the first transistor is connected with the first node, and a grid electrode of the first transistor is connected with the first scanning signal input end;
a first end of the third transistor is connected to the second voltage input end, a second end of the third transistor is connected to the second node, and a grid electrode of the third transistor is connected to the first scanning signal input end;
the second input module includes: a fourth transistor;
a first end of the fourth transistor is connected with the third voltage input end, a second end of the fourth transistor is connected with the second node, and a grid electrode of the fourth transistor is connected with the second scanning signal input end;
the driving module includes: a second transistor;
the first end of the second transistor is connected with the first voltage input end, the second end of the second transistor is connected with the anode of the light emitting diode, and the grid electrode of the second transistor is connected with the first node.
2. The pixel driving circuit according to claim 1, wherein each transistor is an NMOS transistor.
3. The pixel driving circuit according to claim 1, wherein the first voltage input terminal and the second voltage input terminal are configured to provide a driving voltage for the light emitting diode, and the third voltage input terminal is configured to provide a reference voltage.
4. The pixel driving circuit according to claim 3, wherein the voltage value of the third voltage input terminal is greater than the voltage value of the second voltage input terminal.
5. The pixel driving circuit according to claim 1, wherein the driving timing of the pixel driving circuit comprises: a first time period and a second time period;
in the first period, a first scan signal at the first scan signal input terminal is at a high level, a second scan signal at the second scan signal input terminal is at a low level, the first transistor and the third transistor are turned on, the fourth transistor is turned off, a voltage at the first node is aligned with a voltage at the data signal input terminal, and a voltage at the second node is aligned with a voltage at the second voltage input terminal;
in the second time period, the first scan signal at the first scan signal input terminal is at a low level, the second scan signal at the second scan signal input terminal is at a high level, the first transistor and the third transistor are turned off, the fourth transistor is turned on, the voltage at the second node is leveled with the voltage at the third voltage input terminal, and due to capacitive coupling, the potential at the first node is raised, so that the second transistor is turned on to drive the light emitting diode to emit light.
6. The pixel driving circuit according to claim 5, wherein the voltage at the first node after being boosted:wherein, VdataIs the voltage at the data signal input terminal, VrefC1 is the voltage of the third voltage input terminal, Cst is the capacitance of the first capacitor, and OCSS is the voltage of the second voltage input terminal.
7. A display panel comprising the pixel drive circuit according to any one of claims 1 to 6.
CN201810725978.2A 2018-07-04 2018-07-04 Pixel driving circuit and display panel CN108847183B (en)

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CN201810725978.2A CN108847183B (en) 2018-07-04 2018-07-04 Pixel driving circuit and display panel
PCT/CN2018/103900 WO2020006854A1 (en) 2018-07-04 2018-09-04 Pixel driving circuit and display panel

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