CN114023259A - Pixel driving circuit and driving method thereof - Google Patents

Pixel driving circuit and driving method thereof Download PDF

Info

Publication number
CN114023259A
CN114023259A CN202111452154.0A CN202111452154A CN114023259A CN 114023259 A CN114023259 A CN 114023259A CN 202111452154 A CN202111452154 A CN 202111452154A CN 114023259 A CN114023259 A CN 114023259A
Authority
CN
China
Prior art keywords
module
driving
control
coupling
initialization
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202111452154.0A
Other languages
Chinese (zh)
Other versions
CN114023259B (en
Inventor
鲁建军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hefei Visionox Technology Co Ltd
Original Assignee
Hefei Visionox Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hefei Visionox Technology Co Ltd filed Critical Hefei Visionox Technology Co Ltd
Priority to CN202111452154.0A priority Critical patent/CN114023259B/en
Publication of CN114023259A publication Critical patent/CN114023259A/en
Application granted granted Critical
Publication of CN114023259B publication Critical patent/CN114023259B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source

Landscapes

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

Abstract

The invention discloses a pixel driving circuit and a driving method thereof. The pixel driving circuit comprises a data writing module, a threshold compensation module, a driving module, a storage module, a coupling module, a control module and a light-emitting module; the data writing module is used for writing a data voltage signal into the first end of the coupling module in a first threshold compensation stage; the control end of the threshold compensation module is connected with a first enabling signal, and the threshold compensation module is used for capturing the threshold voltage of the driving module to the control end of the driving module in a first threshold compensation stage and a second threshold compensation stage; the driving module is used for generating driving current, and the light-emitting module is used for responding to the driving current; the storage module is used for maintaining the electric potential of the first end of the coupling module; the control module is used for writing a first reference signal into the first end of the coupling module in a light-emitting stage, and the coupling module is used for coupling the potential of the first end of the coupling module to the control end of the driving module. The invention achieves the effect of improving the picture quality of the display panel.

Description

Pixel driving circuit and driving method thereof
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a pixel driving circuit and a driving method thereof.
Background
With the development of display technology, the application of display panels is more and more extensive, and the corresponding requirements on display panels are also higher and higher.
When the screen size of the conventional display panel is larger, the problem of lower picture quality of the display panel exists.
Disclosure of Invention
The invention provides a pixel driving circuit and a driving method thereof, which are used for improving the display effect of a display panel.
In a first aspect, an embodiment of the present invention provides a pixel driving circuit, where the pixel driving circuit includes: the device comprises a data writing module, a threshold compensation module, a driving module, a storage module, a coupling module, a control module and a light-emitting module;
the data writing module is used for writing a data voltage signal into the first end of the coupling module in a first threshold compensation stage;
the control end of the threshold compensation module is connected with a first enabling signal, and the threshold compensation module is used for capturing the threshold voltage of the driving module to the control end of the driving module in a first threshold compensation stage and a second threshold compensation stage;
the driving module is used for generating a driving current, and the light-emitting module is used for responding to the driving current;
the storage module is used for maintaining the electric potential of the first end of the coupling module;
the control module is used for writing a first reference signal into the first end of the coupling module in a light-emitting stage, and the coupling module is used for coupling the potential of the first end of the coupling module to the control end of the driving module.
Optionally, the memory module comprises a first capacitor;
the first end of the first capacitor is the first end of the storage module, and the second end of the first capacitor is the second end of the storage module;
the coupling module comprises a second capacitor, the first end of the second capacitor is the first end of the coupling module, and the second end of the second capacitor is the second end of the coupling module.
Optionally, a capacitance value of the second capacitor is greater than a capacitance value of the first capacitor.
Optionally, a control end of the data writing module is connected to a first scanning signal, a first end of the data writing module is connected to the data voltage signal, a second end of the data writing module is electrically connected to a first end of the storage module, a second end of the storage module is electrically connected to a first end of the driving module, a second end of the data writing module is further electrically connected to a first end of the coupling module, and a second end of the coupling module is electrically connected to a control end of the driving module;
a first end of the driving module is connected with a first power supply signal, a second end of the driving module is electrically connected with a first end of the light-emitting module, and a second end of the light-emitting module is connected with a second power supply signal;
the first end of the threshold compensation module is electrically connected with the control end of the driving module, and the second end of the threshold compensation module is electrically connected with the second end of the driving module;
and the control end of the control module is accessed into a second enabling signal.
Optionally, the pixel driving circuit further comprises a first initialization module;
the control end of the first initialization module is connected with a second scanning signal, the first end of the first initialization module is connected with a first reference signal, the second end of the first initialization module is electrically connected with the first end of the storage module, the second end of the first initialization module is also electrically connected with the first end of the coupling module, and the first initialization module is used for initializing the storage module and the coupling module.
Optionally, the pixel driving circuit further includes a second initialization module and a third initialization module;
a control end of the second initialization module is connected to a second scanning signal, a first end of the second initialization module is connected to a second reference signal, a second end of the second initialization module is electrically connected to a control end of the driving module, and the second initialization module is used for initializing the driving module;
the control end of the third initialization module is connected to the second scanning signal, the first end of the third initialization module is connected to the second reference signal, the second end of the third initialization module is electrically connected to the first end of the light emitting module, and the third initialization module is used for initializing the light emitting module.
Optionally, the pixel driving circuit further comprises a light emission control module;
the second end of the driving module is electrically connected with the first end of the light-emitting module through the light-emitting control module, the control end of the light-emitting control module is connected to the second enable signal, and the light-emitting control module is used for responding to the conduction of the second enable signal so as to control the light-emitting module to respond to the driving current.
Optionally, the control module comprises a first transistor;
the first end of the first transistor is the first end of the control module, the second end of the first transistor is the second end of the control module, and the control end of the first transistor is the control end of the control module.
In a second aspect, an embodiment of the present invention further provides a driving method for a pixel driving circuit, where the driving method is used to drive the pixel driving circuit described in any of the first aspects, and the driving method includes:
in a first threshold compensation stage, a data writing module writes a data voltage signal into a storage module and a coupling module, and a threshold compensation module captures a threshold voltage of a driving module to a control end of the driving module;
in a second threshold compensation stage, the storage module supplements the data voltage signal to the coupling module, and the threshold compensation module captures a threshold voltage of the driving module to a control end of the driving module;
in a light emitting stage, a control module writes a first reference signal into a first end of a coupling module, the coupling module couples the first reference signal of the first end of the coupling module to a control end of a driving module, the driving module is switched on, the driving module generates a driving current, and the light emitting module responds to the driving current.
Optionally, the pixel driving circuit further comprises a first initialization module; the control end of the first initialization module is connected to a second scanning signal, the first end of the first initialization module is connected to a first reference signal, the second end of the first initialization module is electrically connected to the first end of the storage module, and the second end of the first initialization module is also electrically connected to the first end of the coupling module, wherein the driving method further includes:
in an initialization phase, the first initialization module initializes the storage module and the coupling module.
In the present invention, a pixel driving circuit includes: the data writing module can write a data voltage signal into the first end of the coupling module and write the data voltage signal into the storage module in a first threshold compensation stage, so that the driving module can acquire the data voltage signal, the driving module can generate corresponding driving current according to the data voltage signal, and the light emitting module can respond to the driving current to emit light. In addition, in the first threshold compensation stage, the first enable signal controls the threshold compensation module to be conducted, and the threshold compensation module captures the threshold voltage of the driving module to the control end of the driving module, so that the effect of threshold compensation is achieved. In the second threshold compensation stage, the first enabling signal continues to control the threshold compensation module to be conducted, and the threshold compensation module continues to capture the threshold voltage of the driving module to the control end of the driving module, so that the threshold compensation is continued, the time of the threshold compensation is prolonged, and the effect of the threshold compensation is ensured. Therefore, the threshold compensation module is independently controlled through the first enabling signal, so that the on-time of the threshold compensation module can be accurately controlled, the time of threshold compensation can be increased, the effect of threshold compensation is ensured, the uniformity of the brightness of the display panel can be ensured when the display panel is driven at high frequency, and the effect of improving the picture quality of the display panel is achieved. In addition, in the light-emitting stage, the control module writes the first reference signal into the first end of the coupling module, the coupling module couples the potential of the first end of the coupling module to the control end of the driving module, the voltage of the control end of the driving module in the light-emitting stage can be maintained, the conduction of the driving module is guaranteed, the light-emitting module can better display the brightness to be displayed, and the display effect of the display panel is improved. The invention solves the problem that the picture quality of the display panel is lower when the screen body size of the display panel is larger, achieves the effect of improving the picture quality of the display panel and improves the display effect of the display panel.
Drawings
Fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the invention;
fig. 4 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the present invention;
fig. 5 is a flowchart of a driving method of a pixel driving circuit according to an embodiment of the present invention;
FIG. 6 is a timing diagram of a pixel driving circuit according to an embodiment of the present invention;
fig. 7 is a flowchart of a driving method of a pixel driving circuit according to another embodiment of the invention;
fig. 8 is a timing diagram of another pixel driving circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As mentioned in the background art, the conventional display panel has a problem of low picture quality, and the applicant has found through careful study that the reason for this technical problem is that: when the size of the display panel is large, and the refresh frequency is 120HZ, the threshold compensation time of the pixels in the display panel is insufficient due to the large size of the screen body, and in addition, the voltage drop of the power signal of the display panel is serious, which directly causes the picture quality of the display panel to be reduced, and affects the display effect of the display panel.
In view of the above problem, an embodiment of the present invention provides a pixel driving circuit, and fig. 1 is a schematic structural diagram of the pixel driving circuit provided in the embodiment of the present invention, and referring to fig. 1, the pixel driving circuit includes: a data writing module 101, a threshold compensation module 102, a driving module 103, a storage module 104, a coupling module 105, a control module 106 and a light emitting module 107; the data writing module 101 is configured to write a data voltage signal Vdata into a first end of the coupling module 105 in a first threshold compensation stage; a control end of the threshold compensation module 102 is connected to the first enable signal EM1, and the threshold compensation module 102 is configured to capture a threshold voltage of the driving module 103 to the control end of the driving module 103 at a first threshold compensation stage and a second threshold compensation stage; the driving module 103 is used for generating a driving current, and the light emitting module 107 is used for responding to the driving current; the storage module 104 is used for maintaining the potential of the first end of the coupling module 105; the control module 106 is configured to write the first reference signal Vref1 into the first terminal of the coupling module 105 during the light emitting period, and the coupling module 105 is configured to couple the potential of the first terminal to the control terminal of the driving module 103.
Specifically, in the first threshold compensation stage, the data writing module 101 may write the data voltage signal Vdata into the first end of the coupling module 105, and write the data voltage signal Vdata into the storage module 104, so that the driving module 103 may obtain the data voltage signal Vdata, and the driving module 103 may generate a corresponding driving current according to the data voltage signal Vdata, and when the data voltage signal Vdata is written, the storage module 104 may maintain the potential of the first end of the coupling module 105, thereby ensuring that the data writing module 101 may obtain the data voltage signal Vdata. The Light Emitting module 107 is, for example, an Organic Light-Emitting Diode (OLED), and the Light Emitting module 107 can emit Light in response to a driving current. In addition, in the first threshold compensation stage, the first enable signal EM1 controls the threshold compensation module 102 to be turned on, and the threshold compensation module 102 captures the threshold voltage of the driving module 103 to the control terminal of the driving module 103, so as to achieve the effect of threshold compensation. In the second threshold compensation stage, the first enable signal EM1 continues to control the threshold compensation module 102 to be turned on, and the threshold compensation module 102 continues to capture the threshold voltage of the driving module 103 to the control end of the driving module 103, so as to continue to perform threshold compensation, thereby increasing the time for threshold compensation and ensuring the effect of threshold compensation. Therefore, the threshold compensation module 102 is independently controlled by the first enable signal EM1, so that the on-time of the threshold compensation module 102 can be accurately controlled, the time for threshold compensation can be increased, the effect of threshold compensation is ensured, and then, when the display panel is driven at a high frequency, the uniformity of the brightness of the display panel can be ensured, and the effect of improving the picture quality of the display panel is achieved.
In addition, in the light emitting phase, the control module 106 writes the first reference signal Vref1 into the first end of the coupling module 105, the coupling module 105 couples the potential of the first end to the control end of the driving module 103, so that the voltage of the control end of the driving module 103 in the light emitting phase can be maintained, the conduction of the driving module 103 is ensured, and the storage module 104 can also store the data voltage signal Vdata, so that the driving module 103 can better generate a driving current according to the data voltage signal Vdata, so that the light emitting module 107 can better display the brightness to be displayed, and the display effect of the display panel is improved.
The first terminal of the driving module 103 may be connected to the first power signal VDD, the threshold compensation module 102 may further capture the first power signal VDD at the first terminal of the driving module 103 to the control terminal of the driving module 103, so that after the second threshold compensation phase is finished, the potential of the control terminal of the driving module 103 is VDD + Vth, in the light emitting phase, the control module 106 writes the first reference signal Vref1 into the first terminal of the coupling module 105, the coupling module 105 couples the first reference signal Vref1 to the control terminal of the driving module 103, so that the potential of the control terminal of the driving module 103 is VDD + Vth + Vref1-Vdata, and the potential of the first terminal of the driving module 103 is VDD, so that the potential difference between the control terminal of the driving module 103 and the first terminal is Vth + Vref1-Vdata, the driving current is related to the potential difference between the control terminal of the driving module and the first terminal, so that the driving current generated by the driving module 103 is unrelated to the first power signal VDD, therefore, the voltage drop of the first power supply signal VDD can be compensated, the influence of the voltage drop of the first power supply signal VDD on the quality of a display picture is avoided, and the display uniformity of the display panel is ensured.
In the technical solution of this embodiment, the pixel driving circuit includes: the data writing module can write a data voltage signal into the first end of the coupling module and write the data voltage signal into the storage module in a first threshold compensation stage, so that the driving module can acquire the data voltage signal, the driving module can generate corresponding driving current according to the data voltage signal, and the light emitting module can respond to the driving current to emit light. In addition, in the first threshold compensation stage, the first enable signal controls the threshold compensation module to be conducted, and the threshold compensation module captures the threshold voltage of the driving module to the control end of the driving module, so that the effect of threshold compensation is achieved. In the second threshold compensation stage, the first enabling signal continues to control the threshold compensation module to be conducted, and the threshold compensation module continues to capture the threshold voltage of the driving module to the control end of the driving module, so that the threshold compensation is continued, the time of the threshold compensation is prolonged, and the effect of the threshold compensation is ensured. Therefore, the threshold compensation module is independently controlled through the first enabling signal, so that the on-time of the threshold compensation module can be accurately controlled, the time of threshold compensation can be increased, the effect of threshold compensation is ensured, the uniformity of the brightness of the display panel can be ensured when the display panel is driven at high frequency, and the effect of improving the picture quality of the display panel is achieved. In addition, in the light-emitting stage, the control module writes the first reference signal into the first end of the coupling module, the coupling module couples the potential of the first end of the coupling module to the control end of the driving module, the voltage of the control end of the driving module in the light-emitting stage can be maintained, the conduction of the driving module is guaranteed, the light-emitting module can better display the brightness to be displayed, and the display effect of the display panel is improved. The technical scheme of this embodiment has solved display panel when the screen body size is great, can have the lower problem of display panel's picture quality, has reached the effect that improves display panel's picture quality, has improved display panel's display effect.
Fig. 2 is a schematic structural diagram of another pixel driving circuit provided in an embodiment of the present invention, and optionally, referring to fig. 2, the memory module 104 includes a first capacitor C1; the first terminal of the first capacitor C1 is the first terminal of the memory module 104, and the second terminal of the first capacitor C1 is the second terminal of the memory module 104; the coupling module 105 includes a second capacitor C2, a first terminal of the second capacitor C2 is a first terminal of the coupling module 105, and a second terminal of the second capacitor C2 is a second terminal of the coupling module 105.
Specifically, the first capacitor C1 may maintain the potential of the first end of the second capacitor C2, and the first capacitor C1 may store the data voltage signal Vdata, which ensures that the driving module 103 may obtain the data voltage signal Vdata. In the light emitting stage, the control module 106 writes the first reference signal Vref1 into the first terminal of the second capacitor C2, and the second capacitor C2 couples the first reference signal Vref1 to the control terminal of the driving module 103, so as to ensure the conduction of the driving module 103, so that the driving module 103 can generate a driving current better, and the light emitting module 107 can better display the brightness to be displayed.
Optionally, the capacitance of the second capacitor C2 is larger than that of the first capacitor C1.
Specifically, when the capacitance of the second capacitor C2 is too small, the low-frequency signal passes through the second capacitor C2 and is severely attenuated, even cannot pass through the second capacitor C2, so that the capacitance of the second capacitor C2 is large, and the first reference signal Vref1 can be coupled to the control terminal of the driving module 103, so that the coupling accuracy is ensured, and the conduction of the driving module 103 is ensured. However, it should be noted that the capacitance of the second capacitor C2 cannot be too large, and if the capacitance of the second capacitor C2 is too large, the coupling of the first reference signal Vref1 to the control terminal of the driving module 103 is slow, and a delay may occur. The specific value of the second capacitor C2 may be determined according to practical situations, and is not limited herein.
Optionally, with continued reference to fig. 1, the control terminal of the data writing module 101 is connected to the first Scan signal Scan1, the first terminal of the data writing module 101 is connected to the data voltage signal Vdata, the second terminal of the data writing module 101 is electrically connected to the first terminal of the memory module 104, the second terminal of the memory module 104 is electrically connected to the first terminal of the driving module 103, the second terminal of the data writing module 101 is further electrically connected to the first terminal of the coupling module 105, and the second terminal of the coupling module 105 is electrically connected to the control terminal of the driving module 103; a first end of the driving module 103 is connected to a first power signal VDD, a second end of the driving module 103 is electrically connected to a first end of the light emitting module 107, and a second end of the light emitting module 107 is connected to a second power signal VSS; a first end of the threshold compensation module 102 is electrically connected with a control end of the driving module 103, and a second end of the threshold compensation module 102 is electrically connected with a second end of the driving module 103; the control terminal of control module 106 is coupled to a second enable signal EM 2.
Specifically, in the first threshold compensation phase, the first Scan signal Scan1 controls the data writing module 101 to be turned on, and the data writing module 101 can write the data voltage signal Vdata into the first end of the coupling module 105 and into the storage module 104, so that the driving module 103 obtains the data voltage signal Vdata, and thus the driving module 103 can generate a corresponding driving current according to the data voltage signal Vdata, and the light emitting module 107 can emit light in response to the driving current. In addition, in the first threshold compensation stage, the first enable signal EM1 controls the threshold compensation module 102 to be turned on, and the threshold compensation module 102 captures the threshold voltage of the driving module 103 to the control terminal of the driving module 103, so as to achieve the effect of threshold compensation. In the second threshold compensation stage, the first enable signal EM1 continues to control the threshold compensation module 102 to be turned on, and the threshold compensation module 102 continues to capture the threshold voltage of the driving module 103 to the control end of the driving module 103, so as to continue to perform threshold compensation, thereby increasing the time of threshold compensation, ensuring the effect of threshold compensation, and even when the refresh frequency is high, performing sufficient threshold compensation, thereby improving the display uniformity of the display panel. In the light-emitting phase, the second enable signal EM2 controls the control module 106 to be turned on, so that the control module 106 writes the first reference signal Vref1 into the first terminal of the coupling module 105, and the coupling module 105 couples the potential of the first terminal to the control terminal of the driving module 103, thereby maintaining the voltage at the control terminal of the driving module 103 in the light-emitting phase and ensuring the turning on of the driving module 103.
Fig. 3 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the present invention, and optionally, referring to fig. 3, the pixel driving circuit further includes a first initialization module 108; the control terminal of the first initialization module 108 is connected to the second Scan signal Scan2, the first terminal of the first initialization module 108 is connected to the first reference signal Vref1, the second terminal of the first initialization module 108 is electrically connected to the first terminal of the memory module 104, the second terminal of the first initialization module 108 is further electrically connected to the first terminal of the coupling module 105, and the first initialization module 108 is used for initializing the memory module 104 and the coupling module 105.
Specifically, in the initialization stage, the second Scan signal Scan2 controls the first initialization module 108 to be turned on, and the first initialization module 108 initializes the storage module 104 and the coupling module 105, so as to clear the data voltage signal written in the previous frame, thereby clearing the residual charge of the display frame in the previous frame, and improving the display effect. In addition, the first initialization module 108 and the control module 106 are both connected to the first reference signal Vref1, so that the number of signal lines can be reduced, thereby reducing routing and achieving the effect of simplifying the layout.
Optionally, with continued reference to fig. 3, the pixel driving circuit further includes a second initialization module 109 and a third initialization module 110; a control end of the second initialization module 109 is connected to the second Scan signal Scan2, a first end of the second initialization module 109 is connected to the second reference signal Vref2, a second end of the second initialization module 109 is electrically connected to a control end of the driving module 103, and the second initialization module 109 is configured to initialize the driving module 103; the control terminal of the third initialization module 110 is connected to the second Scan signal Scan2, the first terminal of the third initialization module 110 is connected to the second reference signal Vref2, the second terminal of the third initialization module 110 is electrically connected to the first terminal of the light emitting module 107, and the third initialization module 110 is used for initializing the light emitting module 107.
Specifically, in the initialization phase, the second initialization module 109 initializes the driving module 103 so that the voltage of the control terminal of the driving module 103 is Vref2, and the third initialization module 110 initializes the light emitting module 107, and removes the residual charge of the previous frame of display screen, which helps the light emitting module 107 to display the luminance to be displayed.
Illustratively, in the initialization stage, the first initialization module 108 initializes the coupling module 105, the voltage of the first terminal of the coupling module 105 is Vref1, and the second initialization module 109 initializes the driving module 103, so that the voltage of the control terminal of the driving module 103 is Vref 2; in the first threshold compensation phase, the data writing module 101 may write the data voltage signal Vdata into the first end of the coupling module 105, and the coupling moduleThe voltage of the first end of the coupling module 105 is Vdata, and after the threshold compensation module 102 performs threshold compensation, the voltage of the first end of the coupling module 105 is VDD + Vth + Verror, where Vth + Verror is the voltage of the control end of the driving module 103 captured by the threshold compensation module 102 in the first threshold compensation stage; in the second threshold compensation phase, the storage module 104 may supplement the data voltage signal Vdata to the first end of the coupling module 105, so as to ensure that the potential of the first end of the coupling module 105 is Vdata, and the threshold compensation module 102 continues to perform compensation, because the compensation time is sufficient, the threshold voltage is completely compensated, so that the voltage at the control end of the driving module 103 is VDD + Vth, where Vth is the threshold voltage of the driving module 103; in the light emitting phase, the control module 106 writes the first reference signal Vref1 into the coupling module 105, the voltage at the first end of the coupling module 105 is Vref1, the coupling module 105 couples the first reference signal Vref1 to the control end of the driving module 103, so that the voltage at the control end of the driving module 103 is VDD + Vth + Vref1-Vdata, the first power signal VDD charges the light emitting module 107 through the driving module 103 to emit light, and the driving current generated by the driving module 103 is I-K (Vgs-Vth) ═ K [ (VDD + Vth + Vref1-Vdata) -VDD-Vth) — K (VDD + Vth-Vth) — K ═ K-]2＝K(Vref1-Vdata)2Wherein K is a constant related to the driving module 103, Vgs is a potential difference between the control terminal and the first terminal of the driving module 103, so that the driving current is only related to the first reference signal Vref1 and the data voltage signal Vdata, and the driving current is not related to the threshold voltage Vth, thereby achieving the effect of threshold compensation, and the driving current is not related to the first power signal VDD, so that the voltage drop loss of the first power signal VDD does not affect the magnitude of the driving current, so that the light emitting module 107 can better display the luminance to be displayed, which is beneficial to improving the display effect of the display panel.
Optionally, with continued reference to fig. 3, the pixel driving circuit further includes a light emission control module 111; the second end of the driving module 103 is electrically connected to the first end of the light emitting module 107 through the light emitting control module 111, the control end of the light emitting control module 111 is connected to the second enable signal EM2, and the light emitting control module 111 is configured to be turned on in response to the second enable signal EM2 to control the light emitting module 107 to respond to the driving current.
Specifically, in the light emitting phase, the second enable signal EM2 controls the light emitting control module 111 to be turned on, so that the light emitting module 107 can obtain the driving current, and thus the light emitting module 107 can emit light in response to the driving current. In addition, the control end of the light-emitting control module 111 and the control end of the control module 106 are both connected to the second enable signal EM2, which is beneficial to reducing the number of signal lines, reducing the number of routing lines, and achieving the effect of simplifying the layout.
Fig. 4 is a schematic structural diagram of another pixel driving circuit provided in an embodiment of the invention, and optionally, referring to fig. 4, the control module 106 includes a first transistor T1; the first terminal of the first transistor T1 is the first terminal of the control module 106, the second terminal of the first transistor T1 is the second terminal of the control module 106, and the control terminal of the first transistor T1 is the control terminal of the control module 106.
Specifically, in the light emitting phase, the second enable signal EM2 controls the first transistor T1 to be turned on, so that the first transistor T1 writes the first reference signal Vref1 into the first terminal of the coupling module 105, thereby enabling the coupling module 105 to couple the first reference signal Vref1 to the control terminal of the driving module 103.
Optionally, with continued reference to fig. 4, the data writing module 101 includes a second transistor T2, a first terminal of the second transistor T2 is a first terminal of the data writing module 101, a second terminal of the second transistor T2 is a second terminal of the data writing module 101, and a control terminal of the second transistor T2 is a control terminal of the data writing module 101.
The threshold compensation module 102 includes a third transistor T3, a first terminal of the third transistor T3 is a first terminal of the threshold compensation module 102, a second terminal of the third transistor T3 is a second terminal of the threshold compensation module 102, and a control terminal of the third transistor T3 is a control terminal of the threshold compensation module 102.
The driving module 103 includes a fourth transistor T4, a first terminal of the fourth transistor T4 is a first terminal of the driving module 103, a second terminal of the fourth transistor T4 is a second terminal of the driving module 103, and a control terminal of the fourth transistor T4 is a control terminal of the driving module 103.
The width and length of the channels of the second transistor T2 and the third transistor T3 are smaller than the width and length of the channel of the fourth transistor T4, that is, the sizes of the second transistor T2 and the third transistor T3 are smaller, so that the coupling by the coupling module 105 can be avoided, the leakage current in the pixel driving circuit can be reduced, and the display uniformity of the display panel can be improved.
The first initialization block 108 includes a fifth transistor T5, a first terminal of the fifth transistor T5 is a first terminal of the first initialization block 108, a second terminal of the fifth transistor T5 is a second terminal of the first initialization block 108, and a control terminal of the fifth transistor T5 is a control terminal of the first initialization block 108. The second initialization block 109 includes a sixth transistor T6, a first terminal of the sixth transistor T6 is a first terminal of the second initialization block 109, a second terminal of the sixth transistor T6 is a second terminal of the second initialization block 109, and a control terminal of the sixth transistor T6 is a control terminal of the second initialization block 109. The third initialization module 110 includes a seventh transistor T7, a first terminal of the seventh transistor T7 is a first terminal of the third initialization module 110, a second terminal of the seventh transistor T7 is a second terminal of the third initialization module 110, and a control terminal of the seventh transistor T7 is a control terminal of the third initialization module 110.
The light emitting control module 111 includes an eighth transistor T8, a first terminal of the eighth transistor T8 is a first terminal of the light emitting control module 111, a second terminal of the eighth transistor T8 is a second terminal of the light emitting control module 111, and a control terminal of the eighth transistor T8 is a control terminal of the light emitting control module 111.
The first transistor T1 to the eighth transistor T8 are, for example, low temperature polysilicon transistors, which can reduce the cost of the pixel driving circuit, or other transistors, which can be determined according to practical situations, and are not limited herein.
The light emitting module 107 includes an organic light emitting diode D1, an anode of the organic light emitting diode D1 is a first end of the light emitting module 107, and a cathode of the organic light emitting diode D1 is a second end of the light emitting module 107.
Fig. 5 is a flowchart of a driving method of a pixel driving circuit according to an embodiment of the present invention, and referring to fig. 5, the driving method of the pixel driving circuit is used for driving the pixel driving circuit according to any of the above embodiments, and the driving method of the pixel driving circuit includes:
and S510, in a first threshold compensation stage, the data writing module writes a data voltage signal into the storage module and the coupling module, and the threshold compensation module captures a threshold voltage of the driving module to a control end of the driving module.
Specifically, referring to fig. 6 and fig. 1, at a stage t1, the first Scan signal Scan1 controls the data writing module 101 to be turned on, and the data writing module 101 can write the data voltage signal Vdata into the first end of the coupling module 105 and into the storage module 104, so that the driving module 103 obtains the data voltage signal Vdata. In addition, the first enable signal EM1 controls the threshold compensation module 102 to be turned on, and the threshold compensation module 102 captures the threshold voltage of the driving module 103 to the control end of the driving module 103, so as to achieve the effect of threshold compensation.
S520, in the second threshold compensation stage, the storage module supplements the data voltage signal to the coupling module, and the threshold compensation module captures the threshold voltage of the driving module to the control end of the driving module.
Specifically, at the stage t2, the storage module 104 supplements the data voltage signal Vdata to the coupling module 105, maintains the potential of the first end of the coupling module 105, and ensures that the potential of the first end of the coupling module 105 is Vdata, thereby avoiding a first threshold compensation stage, when the potential of the control end of the driving module 103 changes, the potential of the first end of the coupling module 105 is affected, the first enable signal EM1 continues to control the threshold compensation module 102 to be turned on, and the threshold compensation module 102 continues to capture the threshold voltage of the driving module 103 to the control end of the driving module 103, thereby continuing to perform threshold compensation, thereby increasing the time of threshold compensation, ensuring the effect of threshold compensation, and enabling to perform sufficient threshold compensation even in high frequency refresh, thereby improving the display uniformity of the display panel.
And S530, in a light emitting stage, the control module writes the first reference signal into the first end of the coupling module, the coupling module couples the first reference signal at the first end of the coupling module to the control end of the driving module, the driving module is conducted, the driving module generates a driving current, and the light emitting module responds to the driving current.
Specifically, at the stage t3, the second enable signal EM2 controls the control module 106 to be turned on, so that the control module 106 writes the first reference signal Vref1 into the first terminal of the coupling module 105, and the coupling module 105 couples the potential of the first terminal to the control terminal of the driving module 103, so as to maintain the voltage at the control terminal of the driving module 103 during the light emitting stage, and ensure the turning on of the driving module 103.
Optionally, referring to fig. 3, the pixel driving circuit further includes a first initialization module 108; the control terminal of the first initialization module 108 is connected to the second Scan signal Scan2, the first terminal of the first initialization module 108 is connected to the first reference signal Vref1, the second terminal of the first initialization module 108 is electrically connected to the first terminal of the memory module 104, and the second terminal of the first initialization module 108 is further electrically connected to the first terminal of the coupling module 105, fig. 7 is a flowchart of a driving method of a pixel driving circuit according to another embodiment of the present invention, and optionally, referring to fig. 7, the driving method of the pixel driving circuit includes:
and S710, in an initialization stage, the first initialization module initializes the storage module and the coupling module.
Specifically, referring to fig. 8, in a stage t0, the second Scan signal Scan2 controls the first initialization module 108 to be turned on, and the first initialization module 108 initializes the memory module 104 and the coupling module 105, so as to clear the data voltage signal written in the previous frame, thereby clearing the residual charges in the display image of the previous frame, and improving the display effect.
S720, in the first threshold compensation stage, the data writing module writes the data voltage signal into the storage module and the coupling module, and the threshold compensation module captures the threshold voltage of the driving module to the control end of the driving module.
And S730, in the second threshold compensation stage, the storage module supplements the data voltage signal to the coupling module, and the threshold compensation module captures the threshold voltage of the driving module to the control end of the driving module.
S740, in the light emitting stage, the control module writes the first reference signal into the first end of the coupling module, the coupling module couples the first reference signal at the first end to the control end of the driving module, the driving module is turned on, the driving module generates a driving current, and the light emitting module responds to the driving current.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A pixel driving circuit, comprising: the device comprises a data writing module, a threshold compensation module, a driving module, a storage module, a coupling module, a control module and a light-emitting module;
the data writing module is used for writing a data voltage signal into the first end of the coupling module in a first threshold compensation stage;
the control end of the threshold compensation module is connected with a first enabling signal, and the threshold compensation module is used for capturing the threshold voltage of the driving module to the control end of the driving module in a first threshold compensation stage and a second threshold compensation stage;
the driving module is used for generating a driving current, and the light-emitting module is used for responding to the driving current;
the storage module is used for maintaining the electric potential of the first end of the coupling module;
the control module is used for writing a first reference signal into the first end of the coupling module in a light-emitting stage, and the coupling module is used for coupling the potential of the first end of the coupling module to the control end of the driving module.
2. The pixel driving circuit according to claim 1, wherein the storage module comprises a first capacitor;
the first end of the first capacitor is the first end of the storage module, and the second end of the first capacitor is the second end of the storage module;
the coupling module comprises a second capacitor, the first end of the second capacitor is the first end of the coupling module, and the second end of the second capacitor is the second end of the coupling module.
3. The pixel driving circuit according to claim 2, wherein a capacitance value of the second capacitor is larger than a capacitance value of the first capacitor.
4. The pixel driving circuit according to claim 1, wherein a control terminal of the data writing module is connected to a first scan signal, a first terminal of the data writing module is connected to the data voltage signal, a second terminal of the data writing module is electrically connected to a first terminal of the memory module, a second terminal of the memory module is electrically connected to a first terminal of the driving module, a second terminal of the data writing module is further electrically connected to a first terminal of the coupling module, and a second terminal of the coupling module is electrically connected to the control terminal of the driving module;
a first end of the driving module is connected with a first power supply signal, a second end of the driving module is electrically connected with a first end of the light-emitting module, and a second end of the light-emitting module is connected with a second power supply signal;
the first end of the threshold compensation module is electrically connected with the control end of the driving module, and the second end of the threshold compensation module is electrically connected with the second end of the driving module;
and the control end of the control module is accessed into a second enabling signal.
5. The pixel driving circuit according to claim 1, further comprising a first initialization module;
the control end of the first initialization module is connected with a second scanning signal, the first end of the first initialization module is connected with a first reference signal, the second end of the first initialization module is electrically connected with the first end of the storage module, the second end of the first initialization module is also electrically connected with the first end of the coupling module, and the first initialization module is used for initializing the storage module and the coupling module.
6. The pixel driving circuit according to claim 1, further comprising a second initialization module and a third initialization module;
a control end of the second initialization module is connected to a second scanning signal, a first end of the second initialization module is connected to a second reference signal, a second end of the second initialization module is electrically connected to a control end of the driving module, and the second initialization module is used for initializing the driving module;
the control end of the third initialization module is connected to the second scanning signal, the first end of the third initialization module is connected to the second reference signal, the second end of the third initialization module is electrically connected to the first end of the light emitting module, and the third initialization module is used for initializing the light emitting module.
7. The pixel driving circuit according to claim 4, further comprising a light emission control module;
the second end of the driving module is electrically connected with the first end of the light-emitting module through the light-emitting control module, the control end of the light-emitting control module is connected to the second enable signal, and the light-emitting control module is used for responding to the conduction of the second enable signal so as to control the light-emitting module to respond to the driving current.
8. The pixel driving circuit according to claim 1, wherein the control module comprises a first transistor;
the first end of the first transistor is the first end of the control module, the second end of the first transistor is the second end of the control module, and the control end of the first transistor is the control end of the control module.
9. A driving method of a pixel driving circuit, the driving method being for driving the pixel driving circuit according to any one of claims 1 to 8, the driving method comprising:
in a first threshold compensation stage, a data writing module writes a data voltage signal into a storage module and a coupling module, and a threshold compensation module captures a threshold voltage of a driving module to a control end of the driving module;
in a second threshold compensation stage, the storage module supplements the data voltage signal to the coupling module, and the threshold compensation module captures a threshold voltage of the driving module to a control end of the driving module;
in a light emitting stage, a control module writes a first reference signal into a first end of a coupling module, the coupling module couples the first reference signal of the first end of the coupling module to a control end of a driving module, the driving module is switched on, the driving module generates a driving current, and the light emitting module responds to the driving current.
10. The driving method of a pixel driving circuit according to claim 9, the pixel driving circuit further comprising a first initialization block; the control end of the first initialization module is connected to a second scanning signal, the first end of the first initialization module is connected to a first reference signal, the second end of the first initialization module is electrically connected to the first end of the storage module, and the second end of the first initialization module is also electrically connected to the first end of the coupling module, wherein the driving method further includes:
in an initialization phase, the first initialization module initializes the storage module and the coupling module.
CN202111452154.0A 2021-12-01 2021-12-01 Pixel driving circuit and driving method thereof Active CN114023259B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111452154.0A CN114023259B (en) 2021-12-01 2021-12-01 Pixel driving circuit and driving method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111452154.0A CN114023259B (en) 2021-12-01 2021-12-01 Pixel driving circuit and driving method thereof

Publications (2)

Publication Number Publication Date
CN114023259A true CN114023259A (en) 2022-02-08
CN114023259B CN114023259B (en) 2022-10-21

Family

ID=80067430

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111452154.0A Active CN114023259B (en) 2021-12-01 2021-12-01 Pixel driving circuit and driving method thereof

Country Status (1)

Country Link
CN (1) CN114023259B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024036751A1 (en) * 2022-08-15 2024-02-22 昆山国显光电有限公司 Pixel drive circuit and display panel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103474025A (en) * 2013-09-06 2013-12-25 京东方科技集团股份有限公司 Pixel circuit and displayer
KR20140067848A (en) * 2012-11-27 2014-06-05 엘지디스플레이 주식회사 Organic light emitting display device
CN110189704A (en) * 2019-06-28 2019-08-30 上海天马有机发光显示技术有限公司 A kind of electroluminescence display panel, its driving method and display device
CN110400536A (en) * 2018-04-23 2019-11-01 上海和辉光电有限公司 A kind of pixel circuit and its driving method, display panel
CN112820242A (en) * 2021-03-18 2021-05-18 云谷（固安）科技有限公司 Pixel driving circuit, driving method thereof and display panel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140067848A (en) * 2012-11-27 2014-06-05 엘지디스플레이 주식회사 Organic light emitting display device
CN103474025A (en) * 2013-09-06 2013-12-25 京东方科技集团股份有限公司 Pixel circuit and displayer
CN110400536A (en) * 2018-04-23 2019-11-01 上海和辉光电有限公司 A kind of pixel circuit and its driving method, display panel
CN110189704A (en) * 2019-06-28 2019-08-30 上海天马有机发光显示技术有限公司 A kind of electroluminescence display panel, its driving method and display device
CN112820242A (en) * 2021-03-18 2021-05-18 云谷（固安）科技有限公司 Pixel driving circuit, driving method thereof and display panel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024036751A1 (en) * 2022-08-15 2024-02-22 昆山国显光电有限公司 Pixel drive circuit and display panel

Also Published As

Publication number Publication date
CN114023259B (en) 2022-10-21

Similar Documents

Publication Publication Date Title
CN107358917B (en) Pixel circuit, driving method thereof, display panel and display device
CN112382235A (en) Pixel circuit, control method thereof and display panel
CN113299230B (en) Pixel driving circuit, driving method of pixel driving circuit and display panel
TWI498873B (en) Organic light-emitting diode circuit and driving method thereof
CN113781964B (en) Pixel circuit, driving method thereof and display panel
WO2021190077A1 (en) Pixel circuit, display panel, and driving method for pixel circuit
CN111445858A (en) Pixel circuit, driving method thereof and display device
CN111696473B (en) Pixel driving circuit, driving method of pixel driving circuit and display panel
CN112885304B (en) Pixel circuit, display panel and driving method of pixel circuit
CN111710296B (en) Pixel driving circuit, driving method of pixel driving circuit and display panel
CN114170959A (en) Pixel driving circuit and display panel
CN112908245B (en) Pixel circuit, driving method thereof and display panel
CN113362765A (en) Pixel circuit, driving method thereof and display device
CN112908246A (en) Pixel circuit, driving method thereof and display panel
CN114005400A (en) Pixel circuit and display panel
CN114495822A (en) Pixel circuit, driving method thereof and display panel
CN112908267B (en) Pixel circuit, driving method and display device
CN112102782A (en) Pixel driving circuit, display panel and display device
CN114023259B (en) Pixel driving circuit and driving method thereof
CN114241978A (en) Pixel circuit, driving method thereof and display panel
CN104751775A (en) Pixel circuit with compensation function, driving method of pixel circuit and display circuit with compensation function
KR20190016640A (en) Pixel, display device, and method for driving the same
CN116363998A (en) Display panel and display device
CN113990261B (en) Pixel circuit, driving method thereof and display panel
CN114038406B (en) Pixel circuit, driving method thereof and display panel

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant