CN115083352A - Pixel driving circuit, driving method thereof and display panel - Google Patents

Pixel driving circuit, driving method thereof and display panel Download PDF

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Publication number
CN115083352A
CN115083352A CN202210711855.XA CN202210711855A CN115083352A CN 115083352 A CN115083352 A CN 115083352A CN 202210711855 A CN202210711855 A CN 202210711855A CN 115083352 A CN115083352 A CN 115083352A
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transistor
node
module
electrically connected
light
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CN115083352B (en
Inventor
王成
钟晨
刘文婪
赖勐
周井雄
夏志强
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Xiamen Tianma Display Technology Co Ltd
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Xiamen Tianma 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]
    • G09G3/3225—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] using an active matrix
    • G09G3/3233—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] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • 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

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  • 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)

Abstract

The invention discloses a pixel driving circuit, a driving method thereof and a display panel, wherein the pixel driving circuit comprises a first voltage signal end, a second voltage signal end, a light emitting control module, a driving module and a light emitting element, wherein the light emitting control module, the driving module and the light emitting element are connected between the first voltage signal end and the second voltage signal end in series; the control end of the light-emitting control module is electrically connected with the light-emitting control signal wire, the first end of the light-emitting control module is connected with the first voltage signal end, and the second end of the light-emitting control module is electrically connected with the second node; the control end of the driving module is electrically connected with the first node, the first end of the driving module is electrically connected with the second node, and the second end of the driving module is electrically connected with the third node; the invention also comprises a negative feedback voltage stabilizing module which is connected in series between the first voltage signal end and the first node and compensates the potential of the first node when the potential of the first node is increased or decreased in the light-emitting stage.

Description

Pixel driving circuit, driving method thereof and display panel
Technical Field
The invention relates to the technical field of display, in particular to a pixel driving circuit, a driving method thereof and a display panel.
Background
With the continuous development of display technologies, the development process of display panels is gradually accelerated. Organic Light-Emitting Diode (OLED) display panels are increasingly used as a current-type Light-Emitting device in high-performance display, and OLED display panels have excellent characteristics of self-luminescence, no need of backlight, wide color gamut, high contrast, thin thickness, wide viewing angle, fast response speed, applicability to flexible panels, wide temperature range, simple structure and process, and are also increasingly used for mobile phone display.
In a pixel circuit of an organic display panel in the prior art, a gate of a driving transistor generates a leakage current, which causes a light emitting element to flicker at a certain frequency in a light emitting holding stage, even under a constant gray level, the situation can also occur, and is particularly obvious under low brightness.
Therefore, it is desirable to provide a pixel driving circuit, a driving method thereof, and a display panel capable of improving flicker of a light emitting element in a light emission holding stage.
Disclosure of Invention
In view of the above, the present invention provides a pixel driving circuit, a driving method thereof and a display panel, so as to improve the problem of flicker of a light emitting element during a light emitting holding period.
In one aspect, the present invention provides a pixel driving circuit, including:
the driving circuit comprises a first voltage signal end, a second voltage signal end, a light-emitting control module, a driving module and a light-emitting element, wherein the light-emitting control module, the driving module and the light-emitting element are connected between the first voltage signal end and the second voltage signal end in series;
the control end of the light-emitting control module is electrically connected with a light-emitting control signal wire, the first end of the light-emitting control module is connected with the first voltage signal end, and the second end of the light-emitting control module is electrically connected with a second node;
the control end of the driving module is electrically connected with the first node, the first end of the driving module is electrically connected with the second node, the second end of the driving module is electrically connected with the third node, and the driving module is used for generating current for driving the light-emitting element to emit light;
a storage capacitor connected in series between the first voltage signal terminal and the first node;
the light-emitting diode further comprises a negative feedback voltage stabilizing module, wherein the negative feedback voltage stabilizing module is connected between the first voltage signal end and the first node in series and is used for compensating the potential of the first node when the potential of the first node is increased or decreased in a light-emitting stage.
In another aspect, the present invention further provides a display panel including the pixel driving circuit.
In another aspect, the present invention further provides a driving method of a pixel driving circuit, where the pixel driving circuit includes: the driving circuit comprises a first voltage signal end, a second voltage signal end, a light-emitting control module, a driving module and a light-emitting element, wherein the light-emitting control module, the driving module and the light-emitting element are connected between the first voltage signal end and the second voltage signal end in series;
the control end of the light-emitting control module is electrically connected with a light-emitting control signal wire, the first end of the light-emitting control module is connected with the first voltage signal end, and the second end of the light-emitting control module is electrically connected with a second node;
the control end of the driving module is electrically connected with the first node, the first end of the driving module is electrically connected with the second node, the second end of the driving module is electrically connected with the third node, and the driving module is used for generating current for driving the light-emitting element to emit light;
a storage capacitor connected in series between the first voltage signal terminal and the first node;
the negative feedback voltage stabilizing module is connected between the first voltage signal end and the first node in series;
the driving method of the pixel driving circuit includes:
and in the light-emitting stage, when the potential of the first node is increased or decreased, the negative feedback voltage stabilizing module works to compensate the potential of the first node and maintain the potential of the first node unchanged.
Compared with the prior art, the pixel driving circuit, the driving method thereof and the display panel provided by the invention at least realize the following beneficial effects:
the pixel driving circuit is additionally provided with the negative feedback voltage stabilizing module between the first voltage signal end and the first node, and when the potential of the first node is increased or decreased in the light-emitting stage, the negative feedback voltage stabilizing module performs negative feedback to compensate the potential of the first node so as to reduce or increase the potential of the first node, thereby achieving the effect of stabilizing the potential of the first node, improving the flicker problem of a light-emitting element and improving the display performance.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram of a pixel driving circuit in the related art;
FIG. 2 is a timing diagram of the pixel driving circuit of FIG. 1;
FIG. 3 is a block diagram of a pixel driving circuit according to the present invention;
FIG. 4 is a block diagram of another pixel driving circuit provided by the present invention;
FIG. 5 is a block diagram of another pixel driving circuit provided in the present invention;
FIG. 6 is a diagram of a pixel driving circuit according to another embodiment of the present invention;
FIG. 7 is a block diagram of another pixel driving circuit provided by the present invention;
FIG. 8 is a diagram of a pixel driving circuit according to still another embodiment of the present invention;
fig. 9 is a structural diagram of another pixel driving circuit provided by the invention;
fig. 10 is a structural view of still another pixel driving circuit provided by the present invention;
FIG. 11 is a block diagram of another pixel driving circuit provided in the present invention;
fig. 12 is a timing chart of a driving method of the pixel driving circuit of the present invention;
fig. 13 is a schematic diagram of a display panel provided by the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Referring to fig. 1 and 2, fig. 1 is a schematic diagram of a pixel driving circuit in related art, fig. 2 is a timing diagram of the pixel driving circuit in fig. 1, and the pixel driving circuit 000 in fig. 1 includes: a first transistor M1 'having a control terminal electrically connected to the light-emitting signal input terminal, a first terminal electrically connected to the first power signal terminal PVDD, and a second terminal electrically connected to the first terminal of the driving transistor M3'; a second transistor M2, having a control terminal electrically connected to the second scan signal input terminal S2, a first terminal electrically connected to the data signal input terminal Vdata, and a second terminal electrically connected to the first terminal of the driving transistor M3'; a driving transistor M3 'having a control terminal electrically connected to the second terminal of the fifth transistor M5', and a first terminal electrically connected to the second terminal of the first transistor M1 'and the second terminal of the second transistor M2'; a fourth transistor M4 ' having a control terminal electrically connected to the second scan signal input terminal S2, a first terminal electrically connected to the second terminal of the fifth transistor M5 ' and the second terminal of the storage capacitor Cst ', and a second terminal electrically connected to the second terminal of the driving transistor M3 ' and the first terminal of the sixth transistor M6 '; a control terminal of the fifth transistor M5 'is electrically connected to the first scan signal input terminal S1, a first terminal thereof is electrically connected to the reference voltage signal input terminal Vref, and a second terminal thereof is electrically connected to the control terminal of the driving transistor M3'; a control terminal of the sixth transistor M6 'is electrically connected to the emission signal input terminal Emit, a first terminal thereof is electrically connected to the second terminal of the driving transistor M3' and the second terminal of the fourth transistor M4 ', and a second terminal thereof is electrically connected to the anode of the light emitting element O'; a seventh transistor M7 'having a control terminal electrically connected to the second scan signal input terminal, a first terminal electrically connected to the reference voltage signal input terminal, and a second terminal electrically connected to the first terminal of the light emitting element O'; a light emitting element O ' having a first terminal electrically connected to the second terminal of the sixth transistor M6 ' and the second terminal of the seventh transistor M7 ', and a second terminal electrically connected to the second power signal terminal PVEE; the storage capacitor Cst 'has a first terminal electrically connected to the first power signal terminal PVDD and a second terminal electrically connected to the control terminal of the driving transistor M3', a first terminal of the fourth transistor M4 ', and a second terminal of the fifth transistor M5'. The pixel driving circuit 000 is driven at the timing in fig. 2. In the related art, the pixel driving circuit 000 employs 7T1C, where 7T is 7 cmos transistors and 1C is a storage capacitor. Due to process fluctuation or leakage current of the fourth transistor M4 'and the fifth transistor M5', the light emitting current is determined by the voltage of the first power signal terminal PVDD and Vdata, specifically
Id＝K(PVDD-Vdata+|Vth|-|Vth|) 2 ＝K(PVDD-Vdata) 2 And the node N1 may leak current during the light emitting period to cause flicker at a certain frequency, which may occur even at a constant gray level, and is particularly noticeable at low brightness.
In view of the above, the present invention provides a pixel driving circuit, a driving method thereof, and a display panel, which can improve the flicker problem of the light emitting device and improve the display performance. Specific embodiments of the pixel driving circuit, the driving method thereof, and the display panel will be described in detail below.
Referring to fig. 3 to 5, fig. 3 is a structural diagram of a pixel driving circuit provided by the present invention, fig. 4 is a structural diagram of another pixel driving circuit provided by the present invention, fig. 5 is a structural diagram of another pixel driving circuit provided by the present invention, and the pixel driving circuit 100 in fig. 1 includes: a first voltage signal terminal PVDD and a second voltage signal terminal PVEE, and a light emitting control module 1, a driving module 2, and a light emitting element 3 connected in series between the first voltage signal terminal PVDD and the second voltage signal terminal PVEE; the control end of the light-emitting control module 1 is electrically connected with the light-emitting control signal line Emit, the first end 1011 of the light-emitting control module 1 is connected with the first voltage signal end PVDD, and the second end 1012 of the light-emitting control module 1 is electrically connected with the second node N2; the control terminal 2011 of the driving module 2 is electrically connected to the first node N1, the first terminal 2012 of the driving module 2 is electrically connected to the second node N2, the second terminal 2013 of the driving module 2 is electrically connected to the third node N3, and the driving module 2 is configured to generate a current for driving the light emitting element 3 to emit light; a storage capacitor Cst connected in series between the first voltage signal terminal PVDD and the first node N1; the voltage regulator circuit further comprises a negative feedback voltage stabilizing module 4, wherein the negative feedback voltage stabilizing module 4 is connected between the first voltage signal end PVDD and the first node N1 in series, and compensates the potential of the first node N1 when the potential of the first node N1 rises or falls in the lighting period.
It should be noted that fig. 3 only shows one frame structure of the pixel driving circuit 100 in this application, and in some other embodiments of the application, the frame structure of the pixel driving circuit 100 may also be embodied as other structures, which is not specifically limited in this application.
Specifically, the first voltage signal terminal PVDD is at a high potential, the second voltage signal terminal PVEE is at a low potential, the light emission control module 1 between the first voltage signal terminal PVDD and the second voltage signal terminal PVEE controls whether the pixel driving circuit 100 is on, if the light emission control module 1 controls the pixel driving circuit 100 to be on, the light emitting element 3 emits light, and if the light emission control module 1 controls the pixel driving circuit 100 to be off, the light emitting element 3 does not emit light.
It is understood that, in the related art, the light emitting element 3 may flicker at a certain frequency during the light emitting period due to process fluctuation or leakage current of the transistor connected to the first node N1. Of course, this is only one possibility, and there is a case where the potential of the first node N1 is unstable and is raised, and this is not particularly limited. In this embodiment, by additionally providing the negative feedback voltage stabilization module 4 between the first voltage signal terminal PVDD and the first node N1, in the lighting phase, when the potential of the first node N1 rises, the negative feedback voltage stabilization module 4 performs negative feedback, and pulls down the potential of the first node N1, and when the potential of the first node N1 falls, the negative feedback voltage stabilization module 4 performs negative feedback, compensates the potential of the first node N1, and raises the potential of the first node N1, so as to stabilize the potential of the first node N1, thereby improving the flicker problem of the light emitting element 3 and improving the display performance.
Based on the same inventive concept, the present invention further provides a driving method of a pixel driving circuit, comprising: in the lighting phase, when the potential of the first node N1 rises or falls, the negative feedback voltage regulator module 4 operates to compensate the potential of the first node N1 and maintain the potential of the first node N1 constant.
The negative feedback voltage stabilization module 4 is additionally arranged between the first voltage signal end PVDD and the first node N1, in the light emitting stage, when the potential of the first node N1 is increased, the negative feedback voltage stabilization module 4 carries out negative feedback, the potential of the first node N1 is pulled down, when the potential of the first node N1 is decreased, the negative feedback voltage stabilization module 4 carries out negative feedback, the potential of the first node N1 is compensated, the potential of the first node N1 is raised, the effect of stabilizing the potential of the first node N1 is achieved, the flicker problem of the light emitting element 3 is improved, and the display performance is improved.
Optionally, referring to fig. 4, fig. 4 is a structural diagram of another pixel driving circuit provided by the present invention, where the pixel driving circuit 100 in fig. 4 further includes a first reset module 5, a second reset module 6, a data writing module 6, and a compensation module 8, the pixel driving circuit 100 at least includes a non-light-emitting stage and a light-emitting stage, and in the non-light-emitting stage, the pixel driving circuit 100 performs a preparation operation before light emission, for example, the non-light-emitting stage may include a reset stage. The pixel driving circuit 100 of the present application includes a first reset module 5 and a second reset module 6, a first end of the first reset module 5 is connected to the first node N1, a control end of the first reset module 5 is connected to a first control signal end, and a second end of the first reset module 5 is connected to a first reference voltage. A first terminal of the second reset module 6 is connected to the anode of the light emitting element 3, a second terminal of the second reset module 6 is connected to the second reference voltage, and a control terminal of the second reset module 6 is electrically connected to the second control signal terminal S2. In the reset phase, the first reset module 5 is turned on, and the voltage signal of the first reference voltage is transmitted to the first node N1, so as to reset the control terminal 2011 of the driving module 2; meanwhile, the second reset module 6 is turned on, and the voltage signal of the second reference voltage is transmitted to the anode of the light emitting element 3 to reset the anode of the light emitting element 3, although the first reference voltage and the second reference voltage may be the same and are both Vref, that is, the control terminal 2011 of the driving module 2 and the anode of the light emitting element 3 are reset at the same time. For another example, the non-emitting period may further include a data writing period, the pixel driving circuit 100 further includes a data writing module 6 and a compensation module 8, a control terminal of the data writing module 6 is connected to the second control signal terminal S2, a first terminal of the data writing module 6 is connected to the data signal terminal, and a second terminal of the data writing module 6 is connected to the second node N2; the first terminal of the compensation module 8 is connected to the first node N1, the second terminal of the compensation module 8 is connected to the third node N3, and the control terminal of the compensation module 8 is connected to the second control signal terminal S2. In the data writing phase, the second control signal terminal S2 controls the data writing module 6 and the compensation module 8 to be turned on, the data signal terminal transmits the data signal to the second node N2, the voltage level of the second node N2 is transmitted to the third node N3 through the driving module 2, and the voltage level of the third node N3 is transmitted through the compensation module 8To the first node N1, so that the voltage value at the first node N1 is V 0 . The present application describes the non-emission phase only by taking the reset phase and the data write phase as examples, and does not limit the non-emission phase. In the light emitting stage, the driving current of the driving module 2 is transmitted to the light emitting element 3, so that the light emitting element 3 emits light.
It can be understood that, since the first reset module 5 and the compensation module 8 are both electrically connected to the first node N1, the potential of the first node N1 is pulled low during the light-emitting period, and in the present invention, the negative feedback voltage stabilization module 4 is additionally disposed between the first voltage signal terminal PVDD and the first node N1, and during the light-emitting period, when the potential of the first node N1 drops, the negative feedback voltage stabilization module 4 performs negative feedback to compensate the potential of the first node N1 and raise the potential of the first node N1, so as to achieve the effect of stabilizing the potential of the first node N1, thereby improving the flicker problem of the light-emitting element 3 and improving the display performance. In addition, when the potential of the first node N1 rises, the negative feedback voltage stabilization module 4 performs negative feedback to pull down the potential of the first node N1, and the effect of stabilizing the potential of the first node N1 is also achieved, so that the flicker problem of the light emitting element 3 is improved, and the display performance is improved.
Optionally, referring to fig. 5, fig. 5 is a structural diagram of another pixel driving circuit provided by the present invention, the driving module 2 includes a driving transistor M3, a gate of the driving transistor M3 is electrically connected to the first node N1, a first pole of the driving transistor M3 is electrically connected to the second node N2, a second pole of the driving transistor M3 is electrically connected to the third node N3, and the driving transistor M3 generates a current for driving the light emitting element 3 to emit light; the light emission control module 1 includes a fourth transistor M1 and an eighth transistor M6, a gate of the fourth transistor M1 is electrically connected to the light emission control signal line Emit, a first pole of the fourth transistor M1 is connected to the first voltage signal terminal PVDD, a second pole of the fourth transistor M1 is electrically connected to the second node N2, a gate of the eighth transistor M6 is electrically connected to the light emission control signal line Emit, a first pole of the eighth transistor M6 is electrically connected to the third node N3, a second pole of the eighth transistor M6 is electrically connected to an anode of the light emitting element 3, and both the fourth transistor M1 and the eighth transistor M6 are turned on during a light emission period; the drive module 2 package is only schematically shown in fig. 5The driving transistor M3 is included, and the driving transistor M3 in fig. 5 is a P-type transistor, and its active level is low. Of course, the driving transistor M3 may be an N-type transistor, and the active level is high. In fig. 5, the first reset module 5 includes a seventh transistor M5, the second reset module 6 includes a ninth transistor M7, the data write module 6 includes a fifth transistor M2, and the compensation module 8 includes a sixth transistor M4. A first terminal of the seventh transistor M5 is connected to the first node N1, a control terminal of the seventh transistor M5 is connected to the first control signal terminal, and a second terminal of the seventh transistor M5 is connected to the first reference voltage. A first terminal of the ninth transistor M7 is connected to the anode of the light emitting element 3, a second terminal of the ninth transistor M7 is connected to the second reference voltage, and a control terminal of the ninth transistor M7 is electrically connected to the second control signal terminal S2. In the reset phase, the seventh transistor M5 is turned on, the voltage signal of the first reference voltage is transmitted to the first node N1, and the gate of the driving transistor M3 is reset; at the same time, the ninth transistor M7 is turned on, and the voltage signal of the second reference voltage is transmitted to the anode of the light emitting element 3 to reset the anode of the light emitting element 3, although the first reference voltage and the second reference voltage may be the same, that is, the gate of the driving transistor M3 and the anode of the light emitting element 3 are reset at the same time. In the data writing phase, the gate of the fifth transistor M2 is connected to the second control signal terminal S2, the first terminal of the fifth transistor M2 is connected to the data signal terminal, and the second terminal of the fifth transistor M2 is connected to the second node N2; a first pole of the sixth transistor M4 is connected to the first node N1, a second pole of the sixth transistor M4 is connected to the third node N3, and a gate of the sixth transistor M4 is connected to the second control signal terminal S2. In the data writing phase, the second control signal terminal S2 controls the fifth transistor M2 and the sixth transistor M4 to be turned on, the data signal terminal transmits the data signal to the second node N2, the potential of the second node N2 is transmitted to the third node N3 through the driving transistor M3, and the potential of the third node N3 is transmitted to the first node N1 through the sixth transistor M4, so that the voltage value of the first node N1 is V 0 . In the light emitting stage, the driving current of the driving transistor M3 is transmitted to the light emitting element 3, so that the light emitting element 3 emits light.
It can be understood that, since the seventh transistor M5 and the sixth transistor M4 are both electrically connected to the first node N1, during the light emitting period, leakage current may occur in the seventh transistor M5 and the sixth transistor M4, and the potential of the first node N1 is pulled low, whereas in the present invention, the negative feedback voltage stabilization module 4 is additionally disposed between the first voltage signal terminal PVDD and the first node N1, during the light emitting period, when the potential of the first node N1 is decreased, the negative feedback voltage stabilization module 4 performs negative feedback to compensate the potential of the first node N1, and raise the potential of the first node N1, so as to stabilize the potential of the first node N1, thereby improving the flicker problem of the light emitting element 3 and improving the display performance. In addition, when the potential of the first node N1 rises, the negative feedback voltage stabilization module 4 performs negative feedback to pull down the potential of the first node N1, and the effect of stabilizing the potential of the first node N1 is also achieved, so that the flicker problem of the light emitting element 3 is improved, and the display performance is improved.
In some optional embodiments, referring to fig. 6, fig. 6 is a structural diagram of still another pixel driving circuit provided by the present invention, in fig. 6, the negative feedback voltage stabilizing module 4 includes a control unit 4011 and a negative feedback amplifying unit 4022, wherein a control end of the control unit 4011 is electrically connected to the first signal line 11, a first end of the control unit 4011 is connected to the first voltage signal U1, the first voltage signal U1 is a signal for controlling the conduction of the negative feedback amplifying unit 4022, a second end of the control unit 4011 is electrically connected to the first end of the negative feedback amplifying unit 4022, and the control unit 4011 is configured to control the conduction of the negative feedback voltage stabilizing module 4 in a light emitting phase; the second terminal of the negative feedback amplifying unit 4022 is electrically connected to the first voltage signal terminal PVDD, the third terminal of the negative feedback amplifying unit 4022 is electrically connected to the first node N1, and the negative feedback amplifying unit 4022 is configured to compensate the potential of the first node N1 when the potential of the first node N1 increases or decreases in the light emitting phase.
It is understood that the negative feedback voltage stabilization module 4 in the present embodiment is also applicable to the embodiments in fig. 4 and 5, and is not described herein again.
Specifically, the control unit 4011 is configured to control that the negative feedback voltage regulator module 4 is turned on in the light emitting phase, that is, the control unit 4011 controls whether the negative feedback voltage regulator module 4 can work in the light emitting phase and compensate the potential of the first node N1, if the control unit 4011 is turned on, the negative feedback voltage regulator module 4 works to compensate the potential of the first node N1, and if the control unit 4011 is turned off, the negative feedback voltage regulator module 4 does not work and cannot compensate the potential of the first node N1. As shown in fig. 6, the second terminal of the negative feedback amplifying unit 4022 is electrically connected to the first voltage signal terminal PVDD, the third terminal of the negative feedback amplifying unit 4022 is electrically connected to the first node N1, and the negative feedback amplifying unit 4022 is configured to compensate the potential of the first node N1 when the potential of the first node N1 increases or decreases in the light emitting phase.
The negative feedback voltage stabilizing module 4 in this embodiment includes a control unit 4011 and a negative feedback amplifying unit 4022, and compensates the potential of the first node N1 when the potential of the first node N1 increases or decreases in the light emitting period, so as to stabilize the potential of the first node N1, thereby improving the flicker problem of the light emitting element 3 and improving the display performance.
Based on the same inventive concept, the present invention further provides a driving method of a pixel driving circuit, which is applied to the pixel driving circuit 100 in fig. 6, in the driving method of the pixel driving circuit 100, when the potential of the first node N1 increases or decreases in the light emitting phase, the control unit 4011 is turned on, the first voltage signal U1 is input to the first end of the negative feedback amplifying unit 4022, the negative feedback amplifying unit 4022 pulls down or raises the potential of the first node N1, and the potential of the first node N1 is maintained unchanged, so as to improve the flicker problem of the light emitting element 3 and improve the display performance.
In some alternative embodiments, with continued reference to fig. 6, the first signal line 11 is multiplexed into the emission control signal line Emit.
It can be understood that the control unit 4011 controls whether the negative feedback voltage regulator module 4 works, and the potential of the first node N1 changes during the light emitting phase, so that the negative feedback voltage regulator module 4 can work only during the light emitting phase, the light emitting control signal line Emit in the light emitting phase controls the fourth transistor M1 and the eighth transistor M6 to be both turned on, the light emitting element 3 can Emit light, and the first signal line 11 is multiplexed into the light emitting control signal line Emit, so that the negative feedback voltage regulator module 4 can work during the light emitting phase, the potential of the first node N1 is stabilized, the flicker problem of the light emitting element 3 is improved, and the display performance is improved; in addition, the number of signal lines is not increased by multiplexing the first signal line 11 as the emission control signal line Emit.
In some optional embodiments, referring to fig. 7, fig. 7 is a structural diagram of another pixel driving circuit provided by the present invention, in fig. 7, the control unit 4011 includes a first transistor M8, a gate of the first transistor M8 is electrically connected to the first signal line 11, a first pole of the first transistor M8 is connected to the first voltage signal U1, and a second pole of the first transistor M8 is connected to the first end of the negative feedback amplifying unit 4022.
It is understood that the control unit 4011 in the present embodiment is also applicable to the embodiments in fig. 4 and 5, and is not described herein again.
Specifically, the control unit 4011 may be a switching element, and the negative feedback regulator module 4 is controlled to operate by whether the control unit 4011 is turned on, the first transistor M8 is a triode, the first signal line 11 controls whether the first transistor M8 is turned on, and when the first transistor M8 is turned on, the first voltage signal U1 connected to the first pole of the first transistor M8 is transmitted to the first end of the negative feedback amplifier unit 4022.
In some alternative embodiments, referring to fig. 8 and 9, fig. 8 is a structural diagram of another pixel driving circuit provided by the present invention, and fig. 9 is a structural diagram of another pixel driving circuit provided by the present invention. In fig. 8 and 9, the negative feedback amplifying unit 4022 includes a second transistor M10, an amplifying resistor Rb, and a zener diode D1, wherein a gate of the second transistor M10 is connected to a first terminal of the zener diode D1, a first terminal of the zener diode D1 is electrically connected to a second terminal of the first transistor M8, and a second terminal of the zener diode D1 is electrically connected to the first voltage signal terminal PVDD; a first end of the amplifying resistor Rb is electrically connected to a first pole of the second transistor M10, and a second end of the amplifying resistor Rb is electrically connected to a gate of the second transistor M10; a first terminal of the zener diode D1 is electrically connected to the gate of the second transistor M10, and a second terminal of the zener diode D1 is electrically connected to the first node N1.
Specifically, in the present embodiment, only the second transistor M10 is taken as a P-type transistor for illustration, but it is needless to say that the second transistor M10 may be an N-type transistor, and if the second transistor M10 is a P-type transistor, the first voltage signal U0 is at a low potential, and if the second transistor M10 is an N-type transistor, the first voltage signal U0 is at a high potential. In fig. 9, the specific structures of the driving module 2, the light-emitting control module 1, the first resetting module 5, the second resetting module 6, the data writing module 6 and the compensating module 8 are not described again here.
In this embodiment, two ends of the amplifying resistor Rb are respectively connected to the gate and the drain of the second transistor M10, and the amplifying resistor Rb may adjust a static operating point and may also serve as a current-limiting resistor to protect the second transistor M10. The condition that the second transistor M10 is in the working amplification state can be calculated through the amplification resistor Rb, that is, the gate current, the source current and the drain current of the second transistor M10 can be calculated, and saturation distortion or cut-off distortion can be avoided. No specific value for Rb is required here, depending on the parameters of the second transistor M10. That is, the amplifying resistor Rb enables the second transistor M10 to operate in an amplifying state, and limits the amplification factor, and once saturated, it cannot perform the amplification function. The role of the zener diode D1 is to stabilize the voltage at the gate of the second transistor M10, i.e., to ensure that the gate voltage Ug is constant. When the potential U0 of the first node N1 Is pulled low due to a leakage current, the first plate of the two plates of the storage capacitor Cst Is connected to the first node N1, the second plate of the two plates Is electrically connected to the drain of the second transistor M10, and the source voltage Us of the second transistor M10 decreases according to the distance of the capacitive coupling, but the zener diode D1 can keep the voltage of the gate of the second transistor M10 unchanged, so Ugs — Us increases, which leads to an increase in the source current Is, thereby increasing the potential of the second plate of the storage capacitor Cst, and the potential of the first plate of the storage capacitor Cst also increases according to the distance of the capacitive coupling, thereby increasing the potential of the first node N1.
Based on the same inventive concept, the invention also provides a driving method of the pixel driving circuit,
in the light emitting stage, the enable signal of the first signal line 11 controls the first transistor M8 to be turned on, the first voltage signal U1 is input to the first electrode of the second transistor M10, the voltage regulator diode D1 stabilizes the gate potential of the second transistor M10, the gate-source voltage of the first transistor M8 changes, the source current of the first transistor M8 changes, the potential of the storage capacitor Cst is raised or lowered, and then the potential of the first node N1 is raised or lowered.
When the potential U0 of the first node N1 Is pulled low by a leakage current, the first plate of the two plates of the storage capacitor Cst Is connected to the first node N1, the second plate Is electrically connected to the drain of the second transistor M10, and the distance Is away according to the capacitive coupling, so the source potential Us of the second transistor M10 Is decreased, but the zener diode D1 can ensure that the voltage of the gate of the second transistor M10 Is unchanged, so Ugs — Us Is increased, which leads to an increase in the source current Is, thereby increasing the potential of the second plate of the storage capacitor Cst, and according to the capacitive coupling principle, the potential of the first plate of the storage capacitor Cst Is also increased, thereby increasing the potential of the first node N1, stabilizing the potential of the first node N1, improving the flicker problem of the light emitting element 3, and improving the display performance.
When the potential U0 of the first node N1 Is raised, the first plate of the two plates of the storage capacitor Cst Is connected to the first node N1, and the second plate of the two plates Is electrically connected to the drain of the second transistor M10, and Is away from the capacitor coupling, so the source potential Us of the second transistor M10 increases, but the zener diode D1 can ensure that the voltage of the gate of the second transistor M10 Is unchanged, so Ugs-Us decreases, which leads to a decrease in the source current Is, thereby lowering the potential of the second plate of the storage capacitor Cst, and according to the principle of capacitor coupling, the potential of the first plate of the storage capacitor Cst also decreases, thereby lowering the potential of the first node N1, stabilizing the potential of the first node N1, improving the flicker problem of the light emitting element 3, and improving the display performance.
In some alternative embodiments, referring to fig. 10, fig. 10 is a structural diagram of another pixel driving circuit provided by the present invention, and the negative feedback voltage stabilizing module 4 further includes a reset unit 40221 for resetting the gate of the second transistor M10.
It can be understood that the pixel driving circuit 100 cannot affect each other between frames when driving, so that the gate of the second transistor M10 needs to be reset, so that the gate of the second transistor M10 needs to be reset, and the gate of the second transistor M10 is not affected by the previous frame. In this embodiment, a reset unit 40221 is added, and the reset unit 40221 is electrically connected to the gate of the second transistor M10 to reset the gate of the second transistor M10, thereby ensuring that the gate of the second transistor M10 is not affected by the previous frame.
In some alternative embodiments, referring to fig. 11, fig. 11 is a structural diagram of a pixel driving circuit according to yet another embodiment of the present invention, in which the reset unit 40221 in fig. 11 includes a third transistor M9, a gate of the third transistor M9 is electrically connected to the second signal line 12, a first pole of the third transistor M9 is connected to the second voltage signal, and a second pole of the third transistor M9 is electrically connected to a gate of the second transistor M10.
The reset unit 40221 in fig. 11 has a third transistor M9, and in fig. 11, only the third transistor M9 is a P-type transistor, but the third transistor M9 may also be an N-type transistor, which is not limited in this respect.
In this way, when the enable signal of the second signal line 12 controls the third transistor M9 to be turned on in the reset stage, the second voltage signal is transmitted to the gate of the second transistor M10, the gate of the second transistor M10 is reset, and the gate of the second transistor M10 is ensured not to be affected by the previous frame.
In some alternative embodiments, with continued reference to fig. 11, the second voltage signal is ground or zero potential.
The second voltage signal is grounded or at zero potential, so that when the enable signal of the second signal line controls the third transistor M9 to be turned on in the reset stage, the ground voltage or zero potential is transmitted to the gate of the second transistor M10 to reset the gate of the second transistor M10, so that the gate potential of the second transistor M10 can be set to the ground voltage or zero potential to ensure that the gate of the second transistor M10 is not affected by the previous frame.
In some alternative embodiments, with continued reference to fig. 4, 5, 9, 10 and 11, the pixel driving circuit 100 further includes a first reset module 5, a control terminal of the first reset module 5 is electrically connected to the third signal line S1, a second terminal of the first reset module 5 is connected to the first reference voltage, and a first terminal of the first reset module 5 is connected to the first node N1, for resetting the gate of the driving module 2.
It can be understood that, in order to eliminate the influence of the previous frame on the next frame, the gate of the driving module 2 needs to be reset, the pixel driving circuit 100 of this embodiment further includes a first reset module 5, a control terminal of the first reset module 5 is electrically connected to the third signal line S1, a second terminal of the first reset module 5 is connected to the first reference voltage, and a first terminal of the first reset module is connected to the first node N1, so as to reset the gate of the driving module 2.
Optionally, the first reset module 5 includes a seventh transistor M5, a first terminal of the seventh transistor M5 is connected to the first node N1, a control terminal of the seventh transistor M5 is connected to the third signal line S1 (i.e., the first control signal terminal), a second terminal of the seventh transistor M5 is connected to a first reference voltage, the first control signal terminal controls the seventh transistor M5 to be turned on during the reset phase, and the first reference voltage is transmitted to the first node N1 to reset the gate of the driving module 2.
In some alternative embodiments, with continuing reference to fig. 11 and 12, fig. 12 is a timing diagram of a driving method of the pixel driving circuit of the present invention, and the third signal line S1 is multiplexed as the second signal line 12 in fig. 11.
It is understood that the reset of the third transistor M9 and the reset of the gate of the driving transistor M3 can be completed in the same time period, and the third signal line S1 can be multiplexed as the second signal line 12, so that the gate of the driving transistor M3 is reset while the third transistor M9 is reset, and the multiplexing of the third signal line S1 as the second signal line 12 can also save the number of signal lines.
Based on this, the present invention also provides a driving method of a pixel driving circuit, which, in conjunction with fig. 11 and 12, includes a reset phase before the light-emitting phase in the driving method of the pixel driving circuit 100, and of course, before the light-emitting stage, the reset stage and the data writing stage are further included, which is not described herein, and in fig. 12, T1 corresponds to the reset stage, T2 is the data writing stage, T3 is the light-emitting stage, in the reset phase, the third signal line S1 controls the first reset module 5 to be turned on, the first reference voltage is input to the first node N1, the gate of the driving module 2 is reset, and simultaneously the enable signal inputted from the second signal line 12 controls the third transistor M9 to be turned on, the gate of the second transistor M10 is inputted with the second voltage signal to reset the gate of the second transistor M10, thereby resetting the third transistor M9 and also resetting the gate of the driving transistor M3.
Based on the same inventive concept, the present application further provides a display panel, and fig. 13 is a schematic diagram of the display panel provided by the present invention, and the display panel 200 includes the pixel driving circuit provided in any of the above embodiments of the present application. When the display panel 200 in the present application includes the pixel driving circuit provided in the above embodiments, it is beneficial to improve the phenomenon that the display image of the display panel flickers, so as to improve the display effect of the display panel.
It should be noted that, for the embodiments of the display panel 200 provided in the embodiments of the present application, reference may be made to the above embodiments of the display panel, and repeated descriptions are omitted. The display panel 200 provided by the present application may be: any product or component with practical functions such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
As can be seen from the above embodiments, the pixel driving circuit, the driving method thereof, and the display panel provided by the invention at least achieve the following beneficial effects:
the pixel driving circuit is additionally provided with the negative feedback voltage stabilizing module between the first voltage signal end and the first node, and when the potential of the first node is increased or decreased in the light-emitting stage, the negative feedback voltage stabilizing module performs negative feedback to compensate the potential of the first node so as to reduce or increase the potential of the first node, thereby achieving the effect of stabilizing the potential of the first node, improving the flicker problem of a light-emitting element and improving the display performance.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (15)

1. A pixel driving circuit, comprising:
the driving circuit comprises a first voltage signal end, a second voltage signal end, a light-emitting control module, a driving module and a light-emitting element, wherein the light-emitting control module, the driving module and the light-emitting element are connected between the first voltage signal end and the second voltage signal end in series;
the control end of the light-emitting control module is electrically connected with a light-emitting control signal wire, the first end of the light-emitting control module is connected with the first voltage signal end, and the second end of the light-emitting control module is electrically connected with a second node;
the control end of the driving module is electrically connected with the first node, the first end of the driving module is electrically connected with the second node, the second end of the driving module is electrically connected with the third node, and the driving module is used for generating current for driving the light-emitting element to emit light;
a storage capacitor connected in series between the first voltage signal terminal and the first node;
the negative feedback voltage stabilizing module is connected between the first voltage signal end and the first node in series and compensates the potential of the first node when the potential of the first node is increased or decreased in a light-emitting stage.
2. The pixel driving circuit according to claim 1, wherein the negative feedback voltage stabilization module comprises a control unit and a negative feedback amplification unit, wherein,
the control end of the control unit is electrically connected with a first signal line, the first end of the control unit is connected with a first voltage signal, the first voltage signal is a signal for controlling the conduction of the negative feedback amplification unit, the second end of the control unit is electrically connected with the first end of the negative feedback amplification unit, and the control unit is used for controlling the conduction of the negative feedback voltage stabilization module in the light-emitting stage;
the second end of the negative feedback amplifying unit is electrically connected with the first voltage signal end, the third end of the negative feedback amplifying unit is electrically connected with the first node, and the negative feedback amplifying unit is used for compensating the potential of the first node when the potential of the first node is increased or decreased in a light-emitting stage.
3. The pixel driving circuit according to claim 2, wherein the first signal line is multiplexed as the emission control signal line.
4. The pixel driving circuit according to claim 2, wherein the control unit comprises a first transistor, a gate of the first transistor is electrically connected to a first signal line, a first pole of the first transistor is connected to the first voltage signal, and a second pole of the first transistor is connected to the first end of the negative feedback amplifying unit.
5. The pixel driving circuit according to claim 4, wherein the negative feedback amplifying unit comprises a second transistor, an amplifying resistor, and a zener diode, wherein,
the grid electrode of the second transistor is connected with the first end of the voltage stabilizing diode, the first electrode of the transistor is electrically connected with the second electrode of the first transistor, and the second electrode of the second transistor is electrically connected with the first voltage signal end;
a first end of the amplifying resistor is electrically connected with a first pole of the second transistor, and a second end of the amplifying resistor is electrically connected with a grid electrode of the second transistor;
and the first end of the voltage stabilizing diode is electrically connected with the grid electrode of the second transistor, and the second end of the voltage stabilizing diode is electrically connected with the first node.
6. The pixel driving circuit according to claim 5, wherein the negative feedback voltage stabilization module further comprises a reset unit for resetting the gate of the second transistor.
7. The pixel driving circuit according to claim 6, wherein the reset unit comprises a third transistor, a gate of the third transistor is electrically connected to the second signal line, a first pole of the third transistor is connected to the second voltage signal, and a second pole of the third transistor is electrically connected to the gate of the second transistor.
8. The pixel driving circuit according to claim 7, wherein the second voltage signal is ground or zero potential.
9. The pixel driving circuit according to claim 7, further comprising a first reset module, wherein a control terminal of the first reset module is electrically connected to a third signal line, a second terminal of the first reset module is connected to a first reference voltage, and a second terminal of the first reset module is connected to the first node, for resetting the gate of the driving module.
10. The pixel driving circuit according to claim 9, wherein the third signal line is multiplexed into the second signal line.
11. A display panel comprising the pixel driving circuit according to any one of claims 1 to 10.
12. A driving method of a pixel driving circuit, the pixel driving circuit comprising: the driving circuit comprises a first voltage signal end, a second voltage signal end, a light-emitting control module, a driving module and a light-emitting element, wherein the light-emitting control module, the driving module and the light-emitting element are connected between the first voltage signal end and the second voltage signal end in series;
the control end of the light-emitting control module is electrically connected with a light-emitting control signal wire, the first end of the light-emitting control module is connected with the first voltage signal end, and the second end of the light-emitting control module is electrically connected with a second node;
the control end of the driving module is electrically connected with the first node, the first end of the driving module is electrically connected with the second node, the second end of the driving module is electrically connected with the third node, and the driving module is used for generating current for driving the light-emitting element to emit light;
a storage capacitor connected in series between the first voltage signal terminal and the first node;
the negative feedback voltage stabilizing module is connected between the first voltage signal end and the first node in series;
the driving method of the pixel driving circuit includes:
and in the light-emitting stage, when the potential of the first node is increased or decreased, the negative feedback voltage stabilizing module works to compensate the potential of the first node and maintain the potential of the first node unchanged.
13. The driving method of the pixel driving circuit according to claim 12, wherein the negative feedback voltage stabilization module comprises a control unit and a negative feedback amplification unit, wherein a control terminal of the control unit is electrically connected to a first signal line, a first terminal of the control unit is connected to a first voltage signal, the first voltage signal is a signal for controlling the conduction of the negative feedback amplification unit, a second terminal of the control unit is electrically connected to the first terminal of the negative feedback amplification unit, and the control unit is configured to control the conduction of the negative feedback voltage stabilization module during the light emitting period; the second end of the negative feedback amplifying unit is electrically connected with the first voltage signal end, and the third end of the negative feedback amplifying unit is electrically connected with the first node;
in the light-emitting stage, when the potential of the first node increases or decreases, the control unit is turned on, the first voltage signal is input to the first end of the negative feedback amplification unit, and the negative feedback amplification unit pulls down or increases the potential of the first node to maintain the potential of the first node unchanged.
14. The driving method of the pixel driving circuit according to claim 13, wherein the control unit comprises a first transistor, a gate of the first transistor is electrically connected to a first signal line, a first pole of the first transistor is connected to the first voltage signal, and a second pole of the first transistor is connected to a first end of the negative feedback amplifying unit; the negative feedback amplification unit comprises a second transistor, an amplification resistor and a voltage stabilizing diode, wherein the grid electrode of the second transistor is connected with the first end of the voltage stabilizing diode, the first electrode of the diode is electrically connected with the second electrode of the first transistor, and the second electrode of the diode is electrically connected with the first voltage signal end; a first end of the amplifying resistor is electrically connected with a first pole of the second transistor, and a second end of the amplifying resistor is electrically connected with a grid electrode of the second transistor; a first end of the voltage stabilizing diode is electrically connected with the grid electrode of the second transistor, and a second end of the voltage stabilizing diode is electrically connected with the first node;
in the light emitting stage, the enable signal of the first signal line controls the first transistor to be turned on, a first voltage signal is input to the first electrode of the second transistor, the voltage stabilizing diode stabilizes the grid potential of the second transistor and changes the grid-source voltage of the first transistor, the source current of the first transistor changes, the potential of the storage capacitor is increased or decreased, and then the potential of the first node is increased or decreased.
15. The driving method of the pixel driving circuit according to claim 14, wherein the negative feedback voltage stabilization module further comprises a reset unit for resetting the gate of the second transistor, the reset unit comprises a third transistor, the gate of the third transistor is electrically connected to a second signal line, the first pole of the third transistor is connected to a second voltage signal, and the second pole of the third transistor is electrically connected to the gate of the second transistor;
the pixel driving circuit further comprises a first reset module, wherein a control end of the first reset module is electrically connected with a third signal line, a second end of the first reset module is connected with a first reference voltage, and a second end of the first reset module is connected with the first node;
the driving method of the pixel driving circuit further includes:
before the light-emitting phase, a reset phase is included, the third signal line controls the first reset module to be turned on, the first reference voltage is input into the first node to reset the gate of the driving module, meanwhile, an enable signal input by the second signal line controls the third transistor to be turned on, and the second voltage signal is input into the gate of the second transistor to reset the gate of the second transistor.
CN202210711855.XA 2022-06-22 Pixel driving circuit, driving method thereof and display panel Active CN115083352B (en)

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180047337A1 (en) * 2017-04-28 2018-02-15 Shanghai Tianma AM-OLED Co., Ltd. Display panel, display device, and method for driving a pixel circuit
CN109782764A (en) * 2019-01-21 2019-05-21 湖北汽车工业学院 A kind of unmanned logistics distribution system of intelligent solar, control method and dispensing vehicle
CN110473503A (en) * 2019-08-22 2019-11-19 武汉天马微电子有限公司 A kind of pixel circuit, display panel and display device
CN110517639A (en) * 2019-08-29 2019-11-29 京东方科技集团股份有限公司 Pixel compensation circuit, pixel circuit, display device and pixel compensation method
CN112397026A (en) * 2020-12-04 2021-02-23 上海天马有机发光显示技术有限公司 Pixel driving circuit, display panel and driving method thereof
US10984723B1 (en) * 2020-01-02 2021-04-20 Wuhan Tianma Micro-Electronics Co., Ltd. Pixel circuit and drive method thereof, display panel, and display device
CN112908258A (en) * 2021-03-23 2021-06-04 上海天马有机发光显示技术有限公司 Pixel driving circuit, driving method, display panel and display device
CN113539176A (en) * 2021-07-29 2021-10-22 上海天马有机发光显示技术有限公司 Pixel circuit, driving method thereof, display panel and display device
US20220051625A1 (en) * 2021-05-17 2022-02-17 Xiamen Tianma Micro-Electronics Co., Ltd. Display panel and display device
CN114220389A (en) * 2021-12-22 2022-03-22 上海中航光电子有限公司 Pixel driving circuit and driving method thereof, display panel and device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180047337A1 (en) * 2017-04-28 2018-02-15 Shanghai Tianma AM-OLED Co., Ltd. Display panel, display device, and method for driving a pixel circuit
CN109782764A (en) * 2019-01-21 2019-05-21 湖北汽车工业学院 A kind of unmanned logistics distribution system of intelligent solar, control method and dispensing vehicle
CN110473503A (en) * 2019-08-22 2019-11-19 武汉天马微电子有限公司 A kind of pixel circuit, display panel and display device
CN110517639A (en) * 2019-08-29 2019-11-29 京东方科技集团股份有限公司 Pixel compensation circuit, pixel circuit, display device and pixel compensation method
US10984723B1 (en) * 2020-01-02 2021-04-20 Wuhan Tianma Micro-Electronics Co., Ltd. Pixel circuit and drive method thereof, display panel, and display device
CN112397026A (en) * 2020-12-04 2021-02-23 上海天马有机发光显示技术有限公司 Pixel driving circuit, display panel and driving method thereof
CN112908258A (en) * 2021-03-23 2021-06-04 上海天马有机发光显示技术有限公司 Pixel driving circuit, driving method, display panel and display device
US20220051625A1 (en) * 2021-05-17 2022-02-17 Xiamen Tianma Micro-Electronics Co., Ltd. Display panel and display device
CN113539176A (en) * 2021-07-29 2021-10-22 上海天马有机发光显示技术有限公司 Pixel circuit, driving method thereof, display panel and display device
CN114220389A (en) * 2021-12-22 2022-03-22 上海中航光电子有限公司 Pixel driving circuit and driving method thereof, display panel and device

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