CN109801595A - Pixel-driving circuit and display panel - Google Patents
Pixel-driving circuit and display panel Download PDFInfo
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- CN109801595A CN109801595A CN201910173068.2A CN201910173068A CN109801595A CN 109801595 A CN109801595 A CN 109801595A CN 201910173068 A CN201910173068 A CN 201910173068A CN 109801595 A CN109801595 A CN 109801595A
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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
Abstract
Pixel-driving circuit and display panel provided by the embodiments of the present application, effective compensation is carried out to the threshold voltage of the driving transistor in each pixel using the pixel-driving circuit of 3T2C structure, the collocation structure of the pixel-driving circuit is relatively simple, to not need to occupy a large amount of areas in design.
Description
Technical field
This application involves field of display technology, and in particular to a kind of pixel-driving circuit and display panel.
Background technique
OLED (Organic Light Emitting Diode, Organic Light Emitting Diode) display panel have high brightness,
It the advantages that wide viewing angle, fast response time, low-power consumption, has been widely used in high-performance display field at present.Wherein, exist
In OLED display panel, pixel be configured to include multirow, multiple row it is rectangular, each pixel is generallyd use by two crystal
Guan Yuyi capacitor is constituted, and is commonly called as 2T1C circuit, but transistor has threshold voltage shift, and therefore, OLED pixel drives
Dynamic circuit needs corresponding collocation structure.Currently, the collocation structure of OLED pixel driving circuit is complex, in design layout
A large amount of areas are occupied, the design of high PPI (Pixels Per Inch, pixel density) display panel is unfavorable for.
Summary of the invention
The embodiment of the present application is designed to provide a kind of pixel-driving circuit and display panel, is able to solve existing picture
The technical issues of collocation structure of plain driving circuit is complex, occupies a large amount of areas in design layout.
The embodiment of the present application provides a kind of pixel-driving circuit, comprising: the first transistor, second transistor, third crystal
Pipe, first capacitor, the second capacitor and luminescent device；
The grid of the first transistor is electrically connected at first node, and the source electrode of the first transistor is electrically connected at
Second node, the drain electrode of the first transistor are electrically connected at second source signal；
The grid of the second transistor is electrically connected at control signal, and the source electrode of the second transistor is electrically connected at
Data-signal, the drain electrode of the second transistor are electrically connected at the second end of second capacitor；
The grid of the third transistor is electrically connected at the control signal, and the source electrode of the third transistor electrically connects
It is connected to the second node, the drain electrode of the third transistor is electrically connected at the first node；
The anode tap of the luminescent device is electrically connected at the first power supply signal, and the cathode terminal of the luminescent device electrically connects
It is connected to the second node；
The first end of second capacitor is electrically connected at the first node；
The first end of the first capacitor is electrically connected at the first node, and the second end of the first capacitor electrically connects
It is connected to the second source signal.
In pixel-driving circuit described herein, the control signal, the data-signal and second electricity
Source signal, which is combined, successively corresponds to threshold voltage acquisition stage, data voltage acquisition stage and light emitting phase；The data
Signal includes first with reference to low potential, the second reference low potential and display high potential, the current potential of the first reference low potential
Value is less than the described second potential value with reference to low potential, and the potential value of the second reference low potential is less than the display high potential
Potential value；The second source signal includes second source low potential and second source high potential.
In pixel-driving circuit described herein, the potential value of the second source high potential is greater than first electricity
The potential value of the cut-in voltage of the potential value of source signal and the luminescent device.
In pixel-driving circuit described herein, the stage is obtained in the threshold voltage, the control signal is height
Current potential, the data-signal are jumped to described second with reference to low potential with reference to low potential, the second source letter by described first
Number be the second source high potential.
In pixel-driving circuit described herein, the stage is obtained in the data voltage, the control signal is height
Current potential, the data-signal are the display high potential, and the second source signal is the second source high potential.
In pixel-driving circuit described herein, in the light emitting phase, the control signal is low potential, described
Data-signal is jumped to described first by the display high potential with reference to low potential, and the second source signal is by second electricity
Source high potential is jumped to the second source low potential.
In pixel-driving circuit described herein, the first transistor, the second transistor and described
Three transistors are low-temperature polysilicon film transistor, oxide semiconductor thin-film transistor or amorphous silicon film transistor.
In pixel-driving circuit described herein, the electric current and the first transistor of the luminescent device are flowed through
Threshold voltage is unrelated.
In pixel-driving circuit described herein, the luminescent device is Organic Light Emitting Diode.
The embodiment of the present application also provides a kind of display panel, including above-described pixel-driving circuit.
Pixel-driving circuit and display panel provided by the embodiments of the present application, using the pixel-driving circuit pair of 3T2C structure
The threshold voltage of driving transistor in each pixel carries out effective compensation, and the collocation structure of the pixel-driving circuit is more simple
It is single, to not need to occupy a large amount of areas in design.
Detailed description of the invention
In order to more clearly explain the technical solutions in the embodiments of the present application, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the drawings in the following description are only some examples of the present application, for
For those skilled in the art, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the structural schematic diagram of pixel-driving circuit provided by the embodiments of the present application；
Fig. 2 is the timing diagram of pixel-driving circuit provided by the embodiments of the present application；
Fig. 3 is that the threshold voltage under the driver' s timing for applying for that the pixel-driving circuit that embodiment provides is shown in Fig. 2 obtains
The access schematic diagram in stage；
Fig. 4 is that the data voltage under the driver' s timing for applying for that the pixel-driving circuit that embodiment provides is shown in Fig. 2 obtains
The access schematic diagram in stage；
Fig. 5 is the logical of the light emitting phase under the driver' s timing for applying for that the pixel-driving circuit that embodiment provides is shown in Fig. 2
Road schematic diagram.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description.Obviously, described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, those skilled in the art's every other implementation obtained without creative efforts
Example, shall fall in the protection scope of this application.
All transistors used in the examples of the application can be thin film transistor (TFT) or field-effect tube or other characteristic phases
Same device, since the source electrode of the transistor used here, drain electrode are symmetrical, so its source electrode, drain electrode can be interchanged.
In the embodiment of the present application, to distinguish the two poles of the earth of transistor in addition to grid, wherein source electrode will be known as in a pole, another pole is known as leaking
Pole.Intermediate ends by the form prescribed switch transistor in attached drawing are grid, signal input part is source electrode, output end is drain electrode.
Furthermore transistor used by the embodiment of the present application may include P-type transistor and/or two kinds of N-type transistor, wherein p-type is brilliant
Body pipe is connected when grid is low level, ends when grid is high level, and N-type transistor is to lead when grid is high level
It is logical, end when grid is low level.
Referring to Fig. 1, Fig. 1 is the structural schematic diagram of pixel-driving circuit provided by the embodiments of the present application.As shown in Figure 1,
Pixel-driving circuit provided by the embodiments of the present application, comprising: the first transistor T1, second transistor T2, third transistor T3,
One capacitor C1, the second capacitor C2 and luminescent device OLED, luminescent device OLED can be Organic Light Emitting Diode.That is, this
Application embodiment has the threshold voltage of the driving transistor in each pixel using the pixel-driving circuit of 3T2C structure
Effect compensation, has used less component, simple and stable structure has saved cost.The first transistor in the pixel-driving circuit
T1 is driving transistor.
Wherein, the grid of the first transistor T1 is electrically connected at first node a, and the source electrode of the first transistor T1 is electrically connected
In second node b, the drain electrode of the first transistor T1 is electrically connected at second source signal VSS.The grid electricity of second transistor T2
Property be connected to control signal S, the source electrode of second transistor T2 is electrically connected at data-signal D, the drain electrode electricity of second transistor T2
Property is connected to the second end of the second capacitor C2.The grid of third transistor T3 is electrically connected at control signal S, third transistor T3
Source electrode be electrically connected at second node b, the drain electrode of third transistor T3 is electrically connected at first node a.Luminescent device OLED
Anode tap be electrically connected at the first power supply signal Vdd, the cathode terminal of luminescent device OLED is electrically connected at second node b.The
The first end of two capacitor C2 is electrically connected at first node a.The first end of first capacitor C1 is electrically connected at first node a, the
The second end of one capacitor C1 is electrically connected at second source signal VSS.
In some embodiments, the first transistor T1, second transistor T2 and third transistor T3 are low-temperature polysilicon
Silicon thin film transistor, oxide semiconductor thin-film transistor or amorphous silicon film transistor.Pixel provided by the embodiments of the present application
Transistor in driving circuit is same type of transistor, to avoid the otherness pair between different types of transistor
It is influenced caused by pixel-driving circuit.
Referring to Fig. 2, Fig. 2 is the timing diagram of pixel-driving circuit provided by the embodiments of the present application.As shown in Fig. 2, control
Signal S, data-signal D and second source signal VSS, which are combined, successively corresponds to threshold voltage acquisition stage t1, data voltage
Acquisition stage t2 and light emitting phase t3.Wherein, data-signal D include first with reference to low potential, second with reference to low potential and
Show high potential, the potential value of the first reference low potential is less than second with reference to the potential value of low potential, and second with reference to low potential
Potential value is less than the potential value of display high potential.Second source signal VSS includes second source low potential Vsl and second source
High potential Vsh.Potential value and luminescent device OLED of the potential value of second source high potential Vsh greater than the first power supply signal Vdd
Cut-in voltage potential value.In the embodiment of the present application, the first power supply signal Vdd is a constant pressure high potential signal, that is, the
The potential value of one power supply signal Vdd is constant always.
In some embodiments, stage t1 is obtained in threshold voltage, control signal S is high potential, and data-signal D is by first
It jumps to second with reference to low potential with reference to low potential, second source signal VSS is second source high potential Vsh.
In some embodiments, stage t2 is obtained in data voltage, control signal S is high potential, and data-signal D is display
High potential, second source signal VSS are second source high potential Vsh.
It in some embodiments, is low potential in light emitting phase t3, control signal S, data-signal D is jumped by display high potential
First is faded to reference to low potential, second source signal VSS is jumped by second source high potential Vsh to second source low potential Vsl.
Specifically, referring to Fig. 3, Fig. 3 is the driver' s timing for applying for that the pixel-driving circuit that embodiment provides is shown in Fig. 2
Under threshold voltage obtain stage t1 access schematic diagram.Firstly, stage t1 is obtained in threshold voltage in conjunction with shown in Fig. 2, Fig. 3,
Control signal S is high potential, and second transistor T2 and third transistor T3 are opened.Just start, data-signal D is the first reference
Low potential.That is, the first of data-signal D exports with reference to low potential to the second end of the second capacitor C2.First power supply signal Vdd
It exports through luminescent device OLED and third transistor T3 to first node a.Then, data-signal D is jumped by first with reference to low potential
Second is faded to reference to low potential, due to capacitance coupling effect, the current potential of first node a also accordingly changes, at this point, first is brilliant
Body pipe T1 is opened, and first node a is discharged to the first transistor T1 closing.At the same time, threshold voltage obtain stage t1, second
Power supply signal VSS is second source high potential Vsh, and the potential value of second source high potential Vsh is greater than the first power supply signal Vdd
Potential value and luminescent device OLED cut-in voltage potential value, at this point, luminescent device OLED does not shine.
Stage t1 is obtained in the threshold voltage, and the current potential of the drain electrode of the current potential and the first transistor T1 of first node a can be with
It is configured according to the following formula: Vg=Vsh+Vth, Vs=Vsh, wherein VgFor the current potential of first node a, VsFor first crystal
The current potential of the drain electrode of pipe T1, Vth are the threshold voltage of the first transistor T1, and the second source that Vsh is second source signal VSS is high
Current potential Vsh.
Then, referring to Fig. 4, Fig. 4 is under the driver' s timing for applying for that the pixel-driving circuit that embodiment provides is shown in Fig. 2
Data voltage obtain stage t2 access schematic diagram.In conjunction with shown in Fig. 2, Fig. 4, stage t2, control letter are obtained in data voltage
Number S is high potential, and second transistor T2 and third transistor T3 are opened, data-signal D by second with reference to low potential jump to
Show high potential, due to capacitance coupling effect, first node a also accordingly changes.At the same time, rank is obtained in data voltage
Section t2, second source signal VSS are second source high potential Vsh, and the potential value of second source high potential Vsh is greater than the first electricity
The potential value of the cut-in voltage of the potential value and luminescent device OLED of source signal Vdd, at this point, luminescent device OLED does not shine.
Stage t2 is obtained in the data voltage, and the current potential of the drain electrode of the current potential and the first transistor T1 of first node a can be with
It is configured according to the following formula: Vg=Vsh+Vth+ (Vdata-Vb) C2/ (C1+C2), Vs=Vsh, wherein VgFor first segment
The current potential of point a, VsFor the current potential of the drain electrode of the first transistor T1, Vth is the threshold voltage of the first transistor T1, Vsh second
The second source high potential Vsh of power supply signal VSS, Vdata are the display high potential of data-signal D, and Vb is the of power supply signal
Two refer to low potential, and C1 is the capacitance of first capacitor C1, and C2 is the capacitance of the second capacitor C2.
Finally, referring to Fig. 5, Fig. 5 is under the driver' s timing for applying for that the pixel-driving circuit that embodiment provides is shown in Fig. 2
Light emitting phase t3 access schematic diagram.In conjunction with shown in Fig. 2, Fig. 5, in light emitting phase t3, control signal S is low potential, second
Transistor T2 and third transistor T3 is closed, and data-signal D fails to export to the second end of the second capacitor C2.Due to the first electricity
Hold the memory action of C1 and the second capacitor C2, the pressure between the current potential of the drain electrode of the current potential and the first transistor T1 of first node a
Difference remains unchanged.At the same time, it is jumped by second source high potential Vsh to second in light emitting phase t3, second source signal VSS
Power supply low potential Vsl, at this point, luminescent device OLED shines.
In light emitting phase t3, the pressure difference between first node a and the drain electrode of the first transistor T1 can be according to the following formula
It obtains: Vgs=Vth+ (Vdata-Vb) C2/ (C1+C2), wherein VgFor the current potential of first node a, VsFor the first transistor T1's
The current potential of drain electrode, Vth are the threshold voltage of the first transistor T1, and Vdata is the display high potential of data-signal D, and Vb is power supply
The second of signal refers to low potential, and C1 is the capacitance of first capacitor C1, and C2 is the capacitance of the second capacitor C2.
Further, the formula for flowing through the electric current of luminescent device OLED is calculated are as follows:
IOLED=1/2Cox (μ W/L) (Vgs1-Vth)2, wherein IOLEDFor the electric current for flowing through luminescent device OLED, μ
The carrier mobility of one transistor T1, W and L are respectively the width and length of the channel of the first transistor T1, Vg1s first
Pressure difference, the threshold voltage that Vth is the first transistor T1 between the grid and drain electrode pole of transistor T1.In the embodiment of the present application
In, the leakage of the pressure difference current potential equal to first node a and second transistor T2 between the grid and drain electrode pole of the first transistor T1
Pressure difference between the current potential of pole.By the pressure difference V between the current potential of the drain electrode of the current potential of first node a and the first transistor T1gs=
Vth+ (Vdata-Vb) C2/ (C1+C2) substitutes into above formula, that is, has:
IOLED=1/2Cox (μ W/L) (Vgs-Vth)2
=1/2Cox (μ W/L) ((Vdata-Vb) C2/ (C1+C2))2
It can be seen that the electric current of luminescent device OLED is unrelated with the threshold voltage of the first transistor T1, compensation function is realized
Energy.Luminescent device OLED shines, and the electric current for flowing through luminescent device OLED is unrelated with the threshold voltage of the first transistor T1.
Application embodiment itself also provides a kind of display panel comprising above-described pixel-driving circuit specifically may be used
Referring to above to the description of the pixel-driving circuit, this will not be repeated here.
Pixel-driving circuit and display panel provided by the embodiments of the present application, using the pixel-driving circuit pair of 3T2C structure
The threshold voltage of driving transistor in each pixel carries out effective compensation, and the collocation structure of the pixel-driving circuit is more simple
It is single, to not need to occupy a large amount of areas in design.
The above is only the embodiment of the present invention, are not intended to limit the scope of the invention, all to be said using the present invention
Equivalent structure or equivalent flow shift made by bright book and accompanying drawing content is applied directly or indirectly in other relevant technology necks
Domain is included within the scope of the present invention.
Claims (10)
1. a kind of pixel-driving circuit characterized by comprising the first transistor, second transistor, third transistor, first
Capacitor, the second capacitor and luminescent device；
The grid of the first transistor is electrically connected at first node, and the source electrode of the first transistor is electrically connected at second
Node, the drain electrode of the first transistor are electrically connected at second source signal；
The grid of the second transistor is electrically connected at control signal, and the source electrode of the second transistor is electrically connected at data
Signal, the drain electrode of the second transistor are electrically connected at the second end of second capacitor；
The grid of the third transistor is electrically connected at the control signal, and the source electrode of the third transistor is electrically connected at
The second node, the drain electrode of the third transistor are electrically connected at the first node；
The anode tap of the luminescent device is electrically connected at the first power supply signal, and the cathode terminal of the luminescent device is electrically connected at
The second node；
The first end of second capacitor is electrically connected at the first node；
The first end of the first capacitor is electrically connected at the first node, and the second end of the first capacitor is electrically connected at
The second source signal.
2. pixel-driving circuit according to claim 1, which is characterized in that the control signal, the data-signal with
And the second source signal is combined and successively corresponds to threshold voltage acquisition stage, data voltage acquisition stage and luminous rank
Section；The data-signal includes first with reference to low potential, the second reference low potential and display high potential, and described first with reference to low
The potential value of current potential is less than the described second potential value with reference to low potential, and the potential value of the second reference low potential is less than described
Show the potential value of high potential；The second source signal includes second source low potential and second source high potential.
3. pixel-driving circuit according to claim 2, which is characterized in that the potential value of the second source high potential is big
In the potential value of the cut-in voltage of the potential value and luminescent device of first power supply signal.
4. pixel-driving circuit according to claim 2, which is characterized in that the stage is obtained in the threshold voltage, it is described
Control signal is high potential, and the data-signal is jumped to described second with reference to low potential with reference to low potential, institute by described first
Stating second source signal is the second source high potential.
5. pixel-driving circuit according to claim 2, which is characterized in that the stage is obtained in the data voltage, it is described
Control signal is high potential, and the data-signal is the display high potential, and the second source signal is the second source
High potential.
6. pixel-driving circuit according to claim 2, which is characterized in that in the light emitting phase, the control signal
For low potential, the data-signal is jumped to described first by the display high potential with reference to low potential, the second source letter
It number is jumped by the second source high potential to the second source low potential.
7. pixel-driving circuit according to claim 1, which is characterized in that the first transistor, second crystal
Pipe and the third transistor are that low-temperature polysilicon film transistor, oxide semiconductor thin-film transistor or amorphous silicon are thin
Film transistor.
8. pixel-driving circuit according to claim 1, which is characterized in that flow through the electric current of the luminescent device with it is described
The threshold voltage of the first transistor is unrelated.
9. pixel-driving circuit according to claim 1, which is characterized in that the luminescent device is organic light-emitting diodes
Pipe.
10. a kind of display panel, which is characterized in that including the described in any item pixel-driving circuits of claim 1-9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910173068.2A CN109801595A (en) | 2019-03-07 | 2019-03-07 | Pixel-driving circuit and display panel |
| PCT/CN2019/095265 WO2020177258A1 (en) | 2019-03-07 | 2019-07-09 | Pixel drive circuit and display panel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910173068.2A CN109801595A (en) | 2019-03-07 | 2019-03-07 | Pixel-driving circuit and display panel |
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| CN109801595A true CN109801595A (en) | 2019-05-24 |
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| WO (1) | WO2020177258A1 (en) |
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| CN110189705A (en) * | 2019-06-19 | 2019-08-30 | 京东方科技集团股份有限公司 | Pixel circuit, display panel and display equipment |
| WO2020177258A1 (en) * | 2019-03-07 | 2020-09-10 | 深圳市华星光电半导体显示技术有限公司 | Pixel drive circuit and display panel |
| CN114708825A (en) * | 2022-04-22 | 2022-07-05 | Tcl华星光电技术有限公司 | Pixel circuit and display panel |
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| CN103700346A (en) * | 2013-12-27 | 2014-04-02 | 合肥京东方光电科技有限公司 | Pixel driving circuit, array substrate, display device and pixel driving method |
| CN103927984A (en) * | 2014-04-01 | 2014-07-16 | 深圳市华星光电技术有限公司 | Pixel drive circuit and pixel drive method of OLED displayer |
| CN104821150B (en) * | 2015-04-24 | 2018-01-16 | 北京大学深圳研究生院 | Image element circuit and its driving method and display device |
| CN108399892A (en) * | 2017-02-06 | 2018-08-14 | 三星显示有限公司 | Pixel and display equipment with pixel |
| KR20180091984A (en) * | 2017-02-06 | 2018-08-17 | 삼성디스플레이 주식회사 | Pixel and display device having the same |
| CN108335671A (en) * | 2018-02-28 | 2018-07-27 | 深圳市华星光电技术有限公司 | AMOLED pixel-driving circuits and driving method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020177258A1 (en) * | 2019-03-07 | 2020-09-10 | 深圳市华星光电半导体显示技术有限公司 | Pixel drive circuit and display panel |
| CN110189705A (en) * | 2019-06-19 | 2019-08-30 | 京东方科技集团股份有限公司 | Pixel circuit, display panel and display equipment |
| CN114708825A (en) * | 2022-04-22 | 2022-07-05 | Tcl华星光电技术有限公司 | Pixel circuit and display panel |
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