CN113506538A - Pixel driving circuit and display panel - Google Patents

Pixel driving circuit and display panel Download PDF

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Publication number
CN113506538A
CN113506538A CN202110807271.8A CN202110807271A CN113506538A CN 113506538 A CN113506538 A CN 113506538A CN 202110807271 A CN202110807271 A CN 202110807271A CN 113506538 A CN113506538 A CN 113506538A
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signal
transistor
electrically connected
actual value
driving transistor
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CN113506538B (en
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韩志斌
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control 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
    • G09G3/22—Control 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
    • G09G3/30—Control 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
    • G09G3/32—Control 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]
    • G09G3/3208—Control 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]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The pixel driving circuit comprises a driving transistor, a first node and a second node, wherein the grid electrode of the driving transistor is electrically connected to the first node, and the source electrode of the driving transistor is connected with a power supply signal; the anode of the light-emitting device is electrically connected with the drain electrode of the driving transistor, and the cathode of the light-emitting device is electrically connected with the grounding end; the signal input module is accessed to the data signal, the first control signal and the power signal and is electrically connected to the first node, and the signal input module is used for controlling the potential of the first node based on the first control signal, the power signal and the data signal; and the voltage drop detection module is accessed to the second control signal and is electrically connected to the source electrode of the driving transistor, and the voltage drop detection module is used for detecting the actual value of the power signal accessed to the source electrode of the driving transistor under the control of the second control signal and adjusting the actual value of the data signal accessed to the signal input module based on the actual value of the power signal accessed to the source electrode of the driving transistor. The display uniformity of the display panel can be improved.

Description

Pixel driving circuit and display panel
Technical Field
The application relates to the field of display, in particular to a pixel driving circuit and a display panel.
Background
An Organic Light Emitting Diode (OLED) display panel has the advantages of high brightness, wide viewing angle, fast response speed, low power consumption, and the like, and is widely applied to the field of high-performance display. In the OLED display panel, pixels are arranged in a matrix including a plurality of rows and a plurality of columns, and each pixel is connected to a power supply signal through a power supply line. However, due to the voltage drop on the power line, the power signal connected to each pixel varies with the voltage drop on the power line, and the display of the OLED display panel is not uniform.
Disclosure of Invention
The application provides a pixel driving circuit and a display panel, which are used for solving the technical problem that the voltage drop change on a power line in the prior art causes uneven display of the display panel.
In a first aspect, the present application provides a pixel driving circuit, comprising:
the grid electrode of the driving transistor is electrically connected to the first node, and the source electrode of the driving transistor is connected to a power supply signal;
the anode of the light-emitting device is electrically connected to the drain electrode of the driving transistor, and the cathode of the light-emitting device is electrically connected to the grounding end;
the signal input module is accessed to a data signal, a first control signal and the power signal and is electrically connected to the first node, and the signal input module is used for controlling the potential of the first node based on the first control signal, the power signal and the data signal;
the voltage drop detection module is connected to a second control signal and is electrically connected to the source electrode of the driving transistor, and the voltage drop detection module is used for detecting the actual value of the power signal connected to the source electrode of the driving transistor under the control of the second control signal and adjusting the actual value of the data signal connected to the signal input module based on the actual value of the power signal connected to the source electrode of the driving transistor.
In the pixel driving circuit provided by the present application, the signal input module includes a first transistor, a second transistor, and a first capacitor;
the grid electrode of the first transistor is connected with the first control signal, the source electrode of the first transistor is connected with the data signal, and the drain electrode of the first transistor is electrically connected with the drain electrode of the second transistor;
the grid electrode of the second transistor is electrically connected to the first node, and the source electrode of the second transistor is connected to the power supply signal;
the first end of the first capacitor is connected to the power signal, and the second end of the first capacitor is electrically connected to the first node.
In the pixel driving circuit provided by the present application, the voltage drop detection module includes a third transistor, a second capacitor, and a detection unit;
a gate of the third transistor is connected to the second control signal, a source of the third transistor is electrically connected to the first end of the second capacitor and the detection unit, and a drain of the third transistor is electrically connected to the source of the driving transistor; the second end of the second capacitor is electrically connected to the grounding end;
the detection unit is used for detecting the actual value of the power signal accessing the source electrode of the driving transistor and adjusting the actual value of the data signal accessing the signal input module based on the actual value of the power signal accessing the source electrode of the driving transistor.
In the pixel driving circuit provided by the present application, the first transistor and the third transistor are N-type transistors; the second transistor and the driving transistor are P-type transistors.
In the pixel driving circuit provided by the present application, the combination of the first control signal and the second control signal sequentially corresponds to a detection phase and a light emitting phase.
In the pixel driving circuit provided by the present application, in the detection stage, the first control signal is at a low potential, the second control signal is at a high potential, and the potential of the actual value of the source electrode of the driving transistor, which is accessed by the power signal, gradually rises to a stable potential.
In the pixel driving circuit provided by the application, in the light emitting stage, the first control signal is at a high potential, the second control signal is at a low potential, and the adjusted data signal is accessed to the signal input module.
In the pixel driving circuit provided by the present application, the pixel driving circuit calculates an actual value of the data signal accessing the signal input module according to the following formula: vdata＝Vdata_0+a*A，VdataActual value, V, of the signal input module for the data signal accessdata_0And A is the voltage difference between the actual value of the power supply signal connected to the source electrode of the driving transistor and the standard value of the power supply signal, and a is a preset constant.
In the pixel driving circuit provided by the application, the light emitting device is an organic light emitting diode.
In a second aspect, the present application further provides a display panel including any one of the pixel driving circuits described above.
The pixel driving circuit and the display panel provided by the application have the advantages that the voltage drop detection module is arranged for detecting the actual value of the source electrode of the power signal access driving transistor, and the actual value of the data signal access signal input module is adjusted based on the actual value of the source electrode of the power signal access driving transistor; that is, the embodiment of the application detects the power signal connected to each pixel by setting a voltage drop detection module, and can adjust the data signal according to the detected power signal, so that the display panel can not display unevenly due to the voltage drop change on the power line, and the display uniformity of the display panel can be improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present disclosure;
fig. 2 is a circuit diagram of a pixel driving circuit according to an embodiment of the present disclosure;
fig. 3 is an output characteristic curve of a driving transistor in a pixel driving circuit according to an embodiment of the present disclosure;
fig. 4 is a timing diagram of a pixel driving circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic path diagram of a pixel driving circuit provided in the present embodiment in a detection stage under the driving timing shown in fig. 4;
fig. 6 is a schematic diagram of a path of a pixel driving circuit in a light emitting stage according to the driving timing shown in fig. 4 according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a display panel according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the described embodiments are merely a few embodiments of the present application and not all 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 application.
It should be noted that the transistors used in all the embodiments of the present application may be thin film transistors or field effect transistors or other devices with the same characteristics. Since the source and the drain of the transistor adopted by the application are symmetrical, the source and the drain can be interchanged. In the embodiment of the present application, to distinguish two poles of a transistor except for a gate, one of the two poles is referred to as a source, and the other pole is referred to as a drain. The form of the figure provides that the middle end of the transistor is a grid, the signal input end is a source, and the output end is a drain.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present disclosure. As shown in fig. 1, the present embodiment provides a pixel driving circuit 10, which includes a driving transistor T1, a light emitting device D, a signal input module 101, and a voltage drop detection module 102.
The gate of the driving transistor T1 is electrically connected to the first node b. The source of the driving transistor T1 is connected to the power supply signal VDD. The anode of the light emitting device D is electrically connected to the drain of the driving transistor T1. The cathode of the light emitting device D is electrically connected to the ground terminal N. The signal input module 101 receives the Data signal Data, the first control signal S1 and the power signal VDD, and is electrically connected to the first node b. The signal input module 101 is used for controlling the potential of the first node b based on the first control signal S1, the power signal VDD, and the Data signal Data. The voltage drop detecting module 102 receives the second control signal S2 and is electrically connected to the source of the driving transistor T1. The voltage drop detecting module 102 is used for detecting an actual value of the power signal VDD connected to the source of the driving transistor T1 under the control of the second control signal S2, and adjusting an actual value of the Data signal Data connected to the signal input module 101 based on the actual value of the power signal VDD connected to the source of the driving transistor T1.
According to the embodiment of the application, the voltage drop detection module 102 detects the actual value of the power signal VDD accessing the driving transistor T1, so that the actual value of the Data signal Data accessing the signal input module 101 can be adjusted based on the actual value of the power signal VDD accessing the driving transistor T1, and the display uniformity of the display panel can be improved.
In the embodiment of the present application, the driving transistor T1 is a small transistor that can pass enough current and has low on-resistance. The light emitting device D may be a light emitting diode device. The light emitting device D may be, for example, an organic light emitting diode. In addition, the pixel driving circuit 10 provided in the embodiment of the present application adopts a current driving method. That is, the luminance of the light emitting device D in the pixel driving circuit 10 provided in the embodiment of the present application is proportional to the magnitude of the current flowing through the light emitting device D.
In the display panel, the pixels are arranged in a matrix including a plurality of rows and a plurality of columns, and each pixel is connected to a power supply signal VDD through a power supply line. However, the voltage drop on the power line causes the power signal VDD switched in by each pixel to vary with the voltage drop on the power line. Therefore, in the embodiment of the present application, a voltage drop detection module 102 is arranged to detect the power signal VDD connected to each pixel, so that the Data signal Data can be adjusted according to the detected power signal VDD, and the display panel is prevented from displaying unevenly due to the voltage drop change on the power line.
Specifically, fig. 2 and fig. 2 are schematic circuit diagrams of a pixel driving circuit according to an embodiment of the present disclosure. It should be noted that the circuit diagram of the pixel driving circuit shown in fig. 2 is only one circuit implementation in the structural diagram of the pixel driving circuit shown in fig. 1. That is, the signal input module 101 and the voltage drop detection module 102 in fig. 1 can be implemented by various circuits.
As shown in fig. 2, the signal input module 101 includes a first transistor T2, a second transistor T3, and a first capacitor C1. The gate of the first transistor T2 is switched on the first control signal S1. The source of the first transistor T2 is connected to the Data signal Data. The drain of the first transistor T2 is electrically connected to the drain of the second transistor T3. The gate of the second transistor T3 is electrically connected to the first node b. The source of the second transistor T3 is coupled to the power supply signal VDD. A first terminal of the first capacitor C1 is coupled to the power signal VDD. The second end of the first capacitor C1 is electrically connected to the first node b.
As shown in fig. 2, the voltage drop detecting module 102 includes a third transistor T4, a second capacitor C2, and a detecting unit 103. The gate of the third transistor T4 is turned on the second control signal S2. The drain of the third transistor T4 is electrically connected to the first end of the second capacitor C2 and the detecting unit 103. The source of the third transistor T4 is electrically connected to the source of the driving transistor T1. The second end of the second capacitor C2 is electrically connected to the ground terminal N. The detecting unit 103 is used for detecting the actual value of the power signal VDD connected to the source of the driving transistor T1, and adjusting the actual value of the Data signal Data connected to the signal input module 101 based on the actual value of the power signal VDD connected to the source of the driving transistor T1. It should be noted that, in the embodiment of the present application, a specific circuit structure of the detecting unit 103 is not provided, but based on the specific function of the detecting unit 103, a person skilled in the art may set the specific circuit structure, which is not described herein again.
In the embodiment of the present application, the working process of the detecting unit 103 is as follows: the detecting unit 103 may first detect an actual value of the power signal VDD connected to the source of the driving transistor T1, then calculate a voltage difference between the actual value of the power signal VDD connected to the source of the driving transistor T1 and a standard value of the power signal VDD, and finally adjust an actual value of the Data signal Data connected to the signal input module 101 based on the voltage difference between the actual value of the power signal VDD connected to the source of the driving transistor T1 and the standard value of the power signal VDD. The standard value of the power supply signal VDD refers to a preset value of the power supply signal VDD connected to each pixel, and the preset value does not consider the change of the power supply signal VDD connected to each pixel caused by voltage drop on a power line. That is, the standard values of the power supply signals VDD connected to the respective pixels are the same.
In the embodiment of the present application, the first transistor T2 and the third transistor T4 are both N-type transistors. The second transistor T3 and the driving transistor T1 are both P-type transistors. The P-type transistor is switched on when the grid is at a low level and is switched off when the grid is at a high level; the N-type transistor is turned on when the gate is at a high level and turned off when the gate is at a low level.
In one embodiment, the first transistor T2, the second transistor T3, the third transistor T4, and the driving transistor T1 are all low temperature polysilicon thin film transistors, oxide semiconductor thin film transistors, or amorphous silicon thin film transistors. The transistors in the pixel driving circuit provided by the embodiment of the application are the same type of transistors, so that the influence of difference among different types of transistors on the pixel driving circuit is avoided.
In the embodiment of the present application, the pixel driving circuit 10 may calculate the actual value of the Data signal Data accessing to the signal input module 101 according to the following formula: vdata＝Vdata_0+a*A，VdataThe actual value, V, of the signal input module 101 is used for the Data signal Datadata_0The initial value of the Data signal Data is a voltage difference between the actual value of the power signal VDD connected to the source of the driving transistor T1 and the standard value of the power signal VDD, and a is a predetermined constant.
In order to reduce the influence of variations in the driving transistor T1 on the light emitting device D, the driving transistor T1 is generally operated in the saturation region to drive the light emitting device D. However, in an actual manufacturing process, the saturation characteristic of the driving transistor T1 is not fully saturated, and especially in a case where a voltage drop exists on the voltage line, the voltage drop at different points may cause a current of the light emitting device D to vary. The value of a in the embodiment of the present application is set based on this, so that the current variation caused by the saturation characteristic of the driving transistor T1 not being fully saturated in the actual manufacturing process can be compensated.
Referring to fig. 3, fig. 3 is a graph illustrating an output characteristic of a driving transistor T1 in a pixel driving circuit according to an embodiment of the present disclosure. As shown in fig. 3, the abscissa is the voltage V of the drain of the driving transistor T1dOrdinate is the current I flowing through the drive transistor T1d. The curves B1, B2 and B3 in FIG. 3 represent different V values respectivelygsThe actual output characteristic curve corresponding to the lower driving transistor T1. The curves B11, B22 and B33 in FIG. 3 represent different V values respectivelygsThe lower driving transistor T1 corresponds to a standard output characteristic curve. The curves B1 and B11 correspond to the same VgsThe curves B2 and B22 correspond to the same VgsThe curves B3 and B33 correspond to the same Vgs。VgsIs the voltage difference between the gate and the source of the driving transistor T1.
The embodiment of the application can be realized by the same VgsThe actual output characteristic curve of the next one of the driving transistors T1 and the standard output characteristic curve of the next one of the driving transistors T1 give a. Specifically, at the same VgsNext, the standard output characteristic curve of the driving transistor T1 in the saturation region can be calculated according to the following formula: i isd＝(Vgs-Vth)2(ii) a The actual output characteristic curve of the driving transistor T1 in the saturation region can be calculated according to the following equation: i isd＝(Vgs-Vth)2+a*VdWherein V isthIs the threshold voltage of the driving transistor T1. That is, a can be calculated according to the above two formulas in the embodiment of the present application.
For example, a can be calculated from B1 and B11. Alternatively, a is calculated from B2 and B22. Alternatively, a is calculated from B3 and B33.
In some embodiments, a may be obtained by averaging different actual output characteristic curves and different standard output characteristic curves.
For example, a1 can be calculated by B1 and B11, a2 can be calculated by B2 and B22, a3 can be calculated by B3 and B33, and a can be obtained by averaging a1, a2 and a 3.
In the actual manufacturing process of the display device, the output characteristic of the driving transistor may be obtained through testing before shipment, a is obtained based on the actual output characteristic curve of the driving transistor and the standard output characteristic curve of the driving transistor, and a is stored in the memory of the display device.
Referring to fig. 4, fig. 4 is a timing diagram of a pixel driving circuit according to an embodiment of the present disclosure. As shown in fig. 4, the combination of the first control signal S1 and the second control signal S2 corresponds to the detecting phase and the emitting phase. During the detecting period, the first control signal S1 is low, and the second control signal S2 is high. In the light emitting period, the first control signal S1 is at a high level, and the second control signal S2 is at a low level.
Specifically, referring to fig. 4 and 5, fig. 5 is a schematic path diagram of a pixel driving circuit provided in the embodiment of the present application in a detection stage under the driving timing shown in fig. 4. Referring to fig. 4 and 5, in the detecting phase, the first control signal S1 is at a low level, and the second control signal S2 is at a high level. At this time, the first transistor T2 is turned off under the control of the first control signal S1. At this time, the second transistor T3 and the driving transistor T1 are simultaneously turned on by the first capacitor C1. The third transistor T4 is turned on under the control of the second control signal S2, the detecting unit 103 detects the actual value of the power signal VDD coupled to the source of the driving transistor T1 through the third transistor T4, and the potential M of the actual value of the power signal VDD coupled to the source of the driving transistor T1 gradually rises to a stable potential under the action of the second capacitor C2, and at this time, the actual value of the power signal VDD coupled to the source of the driving transistor T1 is detected.
Further, the detecting unit 103 adjusts the actual value of the Data signal Data accessing the signal input module 101 based on the actual value of the power signal VDD accessing the source of the driving transistor T1.
Referring to fig. 4 and 6, fig. 6 is a schematic path diagram of a pixel driving circuit provided in the embodiment of the present application in a light emitting stage at the driving timing shown in fig. 4. As shown in fig. 4 and 6, in the light emitting phase, the first control signal S1 is at a high level, and the second control signal S2 is at a low level. At this time, the first transistor T2 is turned on under the control of the first control signal S1, the actual value of the Data signal Data accessing the signal input module 101 is output to the first node b through the first transistor T2, and the second transistor T3 and the driving transistor T1 are turned on, so that the light emitting device D emits light. The third transistor T4 is turned off under the control of the second control signal S2.
In the embodiment of the application, the voltage drop detection module 102 is arranged to detect the actual value of the power signal VDD accessing the driving transistor T1, and the actual value of the Data signal Data accessing the signal input module 101 can be adjusted based on the actual value of the power signal VDD accessing the driving transistor T1, so that the display uniformity of the display panel can be improved.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure. The embodiment of the present application further provides a display panel 100, which includes the pixel driving circuit 10, and specific reference may be made to the description of the pixel driving circuit 10 above, which is not repeated herein.
The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.

Claims (10)

1. A pixel driving circuit, comprising:
the grid electrode of the driving transistor is electrically connected to the first node, and the source electrode of the driving transistor is connected to a power supply signal;
the anode of the light-emitting device is electrically connected to the drain electrode of the driving transistor, and the cathode of the light-emitting device is electrically connected to the grounding end;
the signal input module is accessed to a data signal, a first control signal and the power signal and is electrically connected to the first node, and the signal input module is used for controlling the potential of the first node based on the first control signal, the power signal and the data signal;
the voltage drop detection module is connected to a second control signal and is electrically connected to the source electrode of the driving transistor, and the voltage drop detection module is used for detecting the actual value of the power signal connected to the source electrode of the driving transistor under the control of the second control signal and adjusting the actual value of the data signal connected to the signal input module based on the actual value of the power signal connected to the source electrode of the driving transistor.
2. The pixel driving circuit according to claim 1, wherein the signal input module comprises a first transistor, a second transistor, and a first capacitor;
the grid electrode of the first transistor is connected with the first control signal, the source electrode of the first transistor is connected with the data signal, and the drain electrode of the first transistor is electrically connected with the drain electrode of the second transistor;
the grid electrode of the second transistor is electrically connected to the first node, and the source electrode of the second transistor is connected to the power supply signal;
the first end of the first capacitor is connected to the power signal, and the second end of the first capacitor is electrically connected to the first node.
3. The pixel driving circuit according to claim 2, wherein the voltage drop detection module comprises a third transistor, a second capacitor and a detection unit;
the gate of the third transistor is connected to the second control signal, the drain of the third transistor is electrically connected to the first end of the second capacitor and the detection unit, and the source of the third transistor is electrically connected to the source of the driving transistor; the second end of the second capacitor is electrically connected to the grounding end; the detection unit is used for detecting the actual value of the power signal accessing the source electrode of the driving transistor and adjusting the actual value of the data signal accessing the signal input module based on the actual value of the power signal accessing the source electrode of the driving transistor.
4. The pixel driving circuit according to claim 3, wherein the first transistor and the third transistor are N-type transistors; the second transistor and the driving transistor are P-type transistors.
5. The pixel driving circuit according to claim 1, wherein the first control signal and the second control signal in combination sequentially correspond to a detection phase and a light emitting phase.
6. The pixel driving circuit according to claim 5, wherein during the detection phase, the first control signal is at a low voltage level, the second control signal is at a high voltage level, and the voltage level of the power signal applied to the actual value of the source of the driving transistor gradually increases to a stable voltage level.
7. The pixel driving circuit according to claim 5, wherein during the light emitting period, the first control signal is at a high level, the second control signal is at a low level, and the adjusted data signal is coupled to the signal input module.
8. The pixel driving circuit according to any of claims 1-7, wherein the pixel driving circuit calculates the actual value of the data signal accessing the signal input module according to the following formula: vdata＝Vdata_0+a*A，VdataActual value, V, of the signal input module for the data signal accessdata_0And A is the voltage difference between the actual value of the power supply signal connected to the source electrode of the driving transistor and the standard value of the power supply signal, and a is a preset constant.
9. The pixel driving circuit according to claim 1, wherein the light emitting device is an organic light emitting diode.
10. A display panel comprising the pixel drive circuit according to any one of claims 1 to 9.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114913802A (en) * 2022-05-31 2022-08-16 Tcl华星光电技术有限公司 Pixel driving circuit and display panel

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