CN109461424A - A kind of driving circuit of display panel, driving method and display device - Google Patents
A kind of driving circuit of display panel, driving method and display device Download PDFInfo
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- CN109461424A CN109461424A CN201910054254.4A CN201910054254A CN109461424A CN 109461424 A CN109461424 A CN 109461424A CN 201910054254 A CN201910054254 A CN 201910054254A CN 109461424 A CN109461424 A CN 109461424A
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
- G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
-
- 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
-
- 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]
- G09G3/3266—Details of drivers for scan electrodes
-
- 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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
Abstract
The embodiment of the present application belongs to field of display technology, provide a kind of driving circuit of display panel, driving method and display device, the first scanning signal that first scan line provides controls first switch unit and the 4th switch unit, the second scanning signal that second scan line provides controls data-signal by controlling the turn-on and turn-off of third switch unit, initialization voltage signal is provided by initializing signal source to initialize driving circuit, it charges to control the data voltage signal of data line offer to first capacitor unit and the second capacitor cell, and driving of the power supply voltage signal of power supply line offer to luminescence unit, so that the electric current for flowing through luminescence unit is not driven the influence of the threshold voltage of unit, it avoids luminescence unit and the uneven problem of display occurs.
Description
Technical field
The embodiment of the present application belongs to field of display technology more particularly to a kind of driving circuit of display panel, driving method
And display device.
Background technique
With the continuous development of display technology, liquid crystal display panel, display etc. show equipment constantly towards high-resolution, large-size screen monitors
Change, low-power consumption, low cost direction develop.Liquid crystal display panel includes the pixel unit embarked on journey He in column, in liquid crystal display panel work,
Gate drive signal controls the opening and closing of the thin film transistor (TFT) (Thin Film Transistor, TFT) in pixel unit,
To complete the row scanning of liquid crystal display panel, realize that liquid crystal display panel shows the function of image, in order to promote display effect, usually to aobvious
Show that panel is driven using active array LED drive circuit.
However, since thin film transistor (TFT) can be because of threshold voltage at prolonged gate stress (gate stress)
It drifts about and the electric current of thin film transistor (TFT) is drifted about, the uneven problem of display occur so as to cause micro- light emitting diode.
Apply for content
The embodiment of the present application provides the driving circuit, driving method and display device of a kind of display panel, it is intended to solve by
Understand at prolonged gate stress (gate stress) in thin film transistor (TFT) makes film brilliant because of the drift of threshold voltage
The electric current of body pipe drifts about, and the uneven problem of display occurs so as to cause micro- light emitting diode.
The embodiment of the present application provides a kind of driving circuit of display panel, comprising:
The input terminal of first switch unit, the first switch unit is connect with power supply line, wherein the power supply line setting
To provide power supply voltage signal；
Initializing signal source is set as providing initialization voltage signal；
The control terminal of second switch unit, the second switch unit is connect with the first scan line, the second switch list
The input terminal of member is connect with initializing signal source, the control of the output end of the second switch unit and the first switch unit
End connection, wherein first scan line is set as providing the first scanning signal, and the second switch unit is set as receiving institute
The first scanning signal is stated, and is controlled according to turn-on and turn-off of first scanning signal to the initialization voltage signal
System；
The input terminal of third switch unit, the third switch unit is connect with data line, the third switch unit
Control terminal is connect with the second scan line, wherein the data line is set as providing data-signal, and second scan line is set as
The second scanning signal is provided, the third switch unit is scanned for receiving second scanning signal, and according to described second
Signal controls the turn-on and turn-off of the data-signal；
Luminescence unit, the first end of the luminescence unit are connect with the output end of the first switch unit, described to shine
Second termination public electrode of unit；
First capacitor unit, the first end of the first capacitor unit are connect with the control terminal of the first switch unit,
The second end of the first capacitor unit is connect with the output end of the third switch unit；
Second capacitor cell, the first end of second capacitor is connect with the output end of the third switch unit, described
The second end of second capacitor cell is connect with the initializing signal source；And
The control terminal of 4th switch unit, the 4th switch unit is connect with first scan line, and the described 4th opens
The input terminal for closing unit is connect with the output end of the third switch unit, the output end and the hair of the 4th switch unit
The first end of light unit connects.
Optionally, the first switch unit, the second switch unit, the third switch unit and the described 4th
Switch unit is electronic switching tube.
Optionally, the electronic switching tube is N-type film crystal field-effect tube；
The drain electrode of the N-type film crystal field-effect tube is the input terminal of the electronic switching tube, the N-type film crystal
The source electrode of field-effect tube is the output end of the electronic switching tube, and the grid of the N-type film crystal field-effect tube is the electricity
The control terminal of sub switch pipe.
Optionally, the first capacitor unit includes first capacitor, and the first end of the first capacitor is as described first
The first end of capacitor cell, second end of the second end of the first capacitor as the first capacitor unit.
Optionally, second capacitor cell includes the second capacitor, and the first end of second capacitor is as described second
The first end of capacitor cell, second end of the second end of second capacitor as second capacitor cell.
Optionally, the luminescence unit includes micro- light emitting diode, and the anode of micro- light emitting diode is described shines
The first end of unit, the cathode of micro- light emitting diode are the second end of the luminescence unit.
Optionally, the electronic switching tube is polycrystalline SiTFT, amorphous silicon film transistor, Zinc oxide based film
Any one in transistor or Organic Thin Film Transistors.
The embodiment of the present application also provides a kind of driving method of any of the above-described driving circuit, the driving method packet
It includes:
In initial phase, high level is set by first scanning signal, sets second scanning signal to
The power supply voltage signal is set low level power signal by low level, sets high electricity for the initialization voltage signal
It is flat, the first data voltage is set by the data voltage signal；
In the threshold voltage compensation stage, high level is set by first scanning signal, by second scanning signal
It is set as low level, sets high level power supply signal for the power supply voltage signal, the initialization voltage signal is arranged
For high level, the first data voltage is set by the data voltage signal；
In the charging stage, low level is set by first scanning signal, sets high for second scanning signal
The power supply voltage signal is set low level power signal by level, sets low level for the initialization voltage signal,
The second data voltage is set by the data voltage signal；
In light emitting phase, low level is set by first scanning signal and second scanning signal, by the electricity
Source voltage signal is set as high level power supply signal, sets low level for the initialization voltage signal, by the data electricity
Pressure signal is set as the first data voltage.
Optionally, the driving method further include:
In the initial phase, the voltage of first power supply voltage signal is set smaller than the luminescence unit
Operating voltage.
Another embodiment of the application also provides a kind of display device, comprising:
Display panel；And
Control unit is electrically connected with the display panel, wherein described control unit includes that any of the above-described such as is implemented
Driving circuit described in example.
The embodiment of the present application provides the driving circuit, driving method and display device of a kind of display panel, the first scanning
The first scanning signal that line provides controls first switch unit and the 4th switch unit, and the second of the offer of the second scan line
Scanning signal controls data-signal by controlling the turn-on and turn-off of third switch unit, is mentioned by initializing signal source
Driving circuit is initialized for initialization voltage signal, to control the data voltage signal of data line offer to the first electricity
Driving of the power supply voltage signal that appearance unit and the second capacitor cell charge and power supply line provides to luminescence unit, makes
Must flow through luminescence unit electric current be not driven unit threshold voltage influence, avoiding luminescence unit, display occur uneven
Problem.
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 accompanying drawings in the following description is some embodiments of the present application, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the structural schematic diagram of the driving circuit for the display panel that one embodiment of the application provides；
Fig. 2 is the structural schematic diagram of the driving circuit for the display panel that another embodiment of the application provides；
Fig. 3 is the flow diagram for the driving method that one embodiment of the application provides；
Fig. 4 is the driver' s timing schematic diagram for the driving method that the application one embodiment provides；
Fig. 5 is the structural schematic diagram for the display device that one embodiment of the application provides.
Specific embodiment
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, technical solutions in the embodiments of the present application are explicitly described, it is clear that described embodiment is the application one
The embodiment divided, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present application.
The description and claims of this application and term " includes " and their any deformations in above-mentioned attached drawing, meaning
Figure, which is to cover, non-exclusive includes.Such as process, method or system comprising a series of steps or units, product or equipment do not have
It is defined in listed step or unit, but optionally further comprising the step of not listing or unit, or optionally also wrap
Include the other step or units intrinsic for these process, methods, product or equipment.In addition, term " first ", " second " and
" third " etc. is for distinguishing different objects, not for description particular order.
Fig. 1 is the structural schematic diagram of the driving circuit for the display panel that one embodiment of the application provides.Such as Fig. 1 institute
Show, the driving circuit of the display panel in the present embodiment includes:
The input terminal of first switch unit 10, the first switch unit 10 is connect with power supply line, wherein the power supply line
It is set as providing power supply voltage signal；
Initializing signal source 104 is set as providing initialization voltage signal；
The control terminal of second switch unit 20, the second switch unit 20 is connect with the first scan line, and described second opens
The input terminal for closing unit 20 is connect with initializing signal source, the output end of the second switch unit 20 and the first switch list
The control terminal connection of member 10, wherein first scan line is set as providing the first scanning signal, the second switch unit 20
Be set as receiving first scanning signal, and according to first scanning signal to the conducting of the initialization voltage signal and
Shutdown is controlled；
The input terminal of third switch unit 30, the third switch unit 30 is connect with data line, and the third switch is single
The control terminal of member 30 is connect with the second scan line, wherein the data line is set as providing data-signal, second scan line
It is set as providing the second scanning signal, the third switch unit 30 is used to receive second scanning signal, and according to described
Second scanning signal controls the turn-on and turn-off of the data-signal；
Luminescence unit 103, the first end of the luminescence unit are connect with the output end of the first switch unit, the hair
Second termination public electrode of light unit；
First capacitor unit 101, the control of the first end of the first capacitor unit 101 and the first switch unit 10
End connection, the second end of the first capacitor unit 101 are connect with the output end of the third switch unit 30；
The output end of second capacitor cell 102, the first end of second capacitor 102 and the third switch unit 30 connects
It connects, the second end of second capacitor cell 102 is connect with the initializing signal source；And
The control terminal of 4th switch unit 40, the 4th switch unit 40 is connect with first scan line, and described
The input terminal of four switch units 40 is connect with the output end of the third switch unit 30, the output of the 4th switch unit 40
End is connect with the first end of the luminescence unit 103.
In one embodiment, the first switch unit 10, the second switch unit 20, the third switch unit
30 and the 4th switch unit 40 be electronic switching tube.
In one embodiment, the electronic switching tube is N-type film crystal field-effect tube；
The drain electrode of the N-type film crystal field-effect tube is the input terminal of the electronic switching tube, the N-type film crystal
The source electrode of field-effect tube is the output end of the electronic switching tube, and the grid of the N-type film crystal field-effect tube is the electricity
The control terminal of sub switch pipe.
Fig. 2 is the structural schematic diagram of the driving circuit for the display panel that another embodiment of the application provides.Referring to figure
2, in one embodiment, the first capacitor unit 101 includes first capacitor C1, the first end conduct of the first capacitor C1
The first end of the first capacitor unit 101, the second end of the first capacitor C1 as the first capacitor unit 101
Two ends.
In one embodiment, first capacitor unit 101 can also be the in series or in parallel of multiple capacitors, for example, more
First end of the first end of a concatenated capacitor as first capacitor unit 101, the second end of multiple concatenated capacitors is as
The second end of one capacitor cell 101.
Referring to fig. 2, in one embodiment, second capacitor cell 102 includes the second capacitor, the second capacitor C2
First end of the first end as second capacitor cell 102, the second end of the second capacitor C2 is as second electricity
Hold the second end of unit 102.
In one embodiment, the second capacitor cell 102 can also be the in series or in parallel of multiple capacitors, for example, more
First end of the first end of a concatenated capacitor as the second capacitor cell 102, the second end of multiple concatenated capacitors is as
The second end of two capacitor cells 102.
Referring to fig. 2, in one embodiment, the luminescence unit 103 includes micro- light emitting diode uLED, described micro- luminous
The anode of diode uLED is the first end of the luminescence unit 103, and the cathode of micro- light emitting diode uLED is the hair
The second end of light unit 103.
Referring to fig. 2, in one embodiment, first switch unit 10 includes first film transistor M1, and the first film is brilliant
The drain electrode of body pipe M1 is the input terminal of first switch unit 10, and the source electrode of first film transistor M1 is first switch unit 10
Output end, the grid of first film transistor M1 are the control terminal of first switch unit 10.
Referring to fig. 2, in one embodiment, second switch unit 20 includes the second thin film transistor (TFT) M2, and the second film is brilliant
The drain electrode of body pipe M2 is the input terminal of second switch unit 20, and the source electrode of the second thin film transistor (TFT) M2 is second switch unit 20
Output end, the grid of the second thin film transistor (TFT) M2 are the control terminal of second switch unit 20.
Referring to fig. 2, in one embodiment, third switch unit 30 includes third thin film transistor (TFT) M3, and third film is brilliant
The drain electrode of body pipe M3 is the input terminal of third switch unit 30, and the source electrode of third thin film transistor (TFT) M3 is third switch unit 30
Output end, the grid of third thin film transistor (TFT) M3 are the control terminal of third switch unit 30.
Referring to fig. 2, in one embodiment, the 4th switch unit 40 includes the 4th thin film transistor (TFT) M4, and the 4th film is brilliant
The drain electrode of body pipe M4 is the input terminal of the 4th switch unit 40, and the source electrode of the 4th thin film transistor (TFT) M4 is the 4th switch unit 40
Output end, the grid of the 4th thin film transistor (TFT) M4 are the control terminal of the 4th switch unit 40.
In one embodiment, the output end of third switch unit 30 is set as node o, by the control of first switch unit
End is set as node m, and the first end of luminescence unit 103 is set as node n.
In one embodiment, public electrode VSS is set as providing a preset voltage signal, which is used for
Improve the stability of driving circuit.
In one embodiment, public electrode VSS can be directly grounded.
Fig. 3 is a kind of driving method of the driving circuit for any of the above-described embodiment that one embodiment of the application provides
Flow diagram.As shown in figure 3, the driving method in the present embodiment includes:
In initial phase, high level is set by first scanning signal, sets second scanning signal to
The power supply voltage signal is set low level power signal by low level, sets high electricity for the initialization voltage signal
It is flat, the first data voltage is set by the data voltage signal；
In the threshold voltage compensation stage, high level is set by first scanning signal, by second scanning signal
It is set as low level, sets high level power supply signal for the power supply voltage signal, the initialization voltage signal is arranged
For high level, the first data voltage is set by the data voltage signal；
In the charging stage, low level is set by first scanning signal, sets high for second scanning signal
The power supply voltage signal is set low level power signal by level, sets low level for the initialization voltage signal,
The second data voltage is set by the data voltage signal；
In light emitting phase, low level is set by first scanning signal and second scanning signal, by the electricity
Source voltage signal is set as high level power supply signal, sets low level for the initialization voltage signal, by the data electricity
Pressure signal is set as the first data voltage.
In one embodiment, the driving method further include:
In the initial phase, the voltage of first power supply voltage signal is set smaller than the luminescence unit
Operating voltage.
Fig. 4 is the driver' s timing schematic diagram for the driving method that the application one embodiment provides.As shown in figure 4, to upper
During the driving for stating the driving circuit of the display panel in embodiment, entire driving process is divided into four-stage, including initial
Change stage T1, threshold voltage compensation stage T2, charging stage T3 and light emitting phase T4.
Specifically, frame time T=(T1+T2+T3+T4) t, t are the number of scan line, that is, frame picture scanning
Number, if scan frequency is 60HZ, a frame time T=1/60=16.7ms, if scan frequency is 120HZ, when a frame
Between T=1/120=8.33ms, for example, having 768 gate for high-res (High Definition, HD) 1366*768
Line, t=768, corresponding T1+T2+T3+T4=21.7 μ s (60HZ situation, or the corresponding scanning t=of 120HZ, 120HZ
10.85 μ s), for full HD (Full High Definition, FHD) resolution, t=1080, corresponding T1+T2+T3+T4
=15.4 μ s, for 4K resolution, i.e., 4096 × 2160 pixel resolution, t=2160, corresponding T1+T2+T3+T4=7.7
μs。
In initial phase T1, the first scanning signal that the first scan line is provided is set as high level VGH, second is swept
The second scanning signal for retouching line offer is set as low level VGL, at this point, second switch unit 20 and the 4th switch unit 40 are led
Logical, the voltage of node m is initialised, and initialization voltage signal is high level VREF, therefore, node m input initialization voltage letter
Number, the voltage of node m is Vm=VREF, and first switch unit 10 is connected at this time, the power supply voltage signal setting that power supply line provides
It is less than the operating voltage of luminescence unit 103 for low level power signal VDD_L, the low level power signal VDD_L, at this point, hair
Light unit 103 does not work, and driving circuit completes initialization.
In threshold voltage compensation stage T2, the first scanning signal keeps high level VGH, and the second scanning signal keeps low level
VGL, at this point, second switch unit 20 and the 4th switch unit 40 continue to be connected, power supply voltage signal becomes high level power supply letter
Number VDD_H, the voltage of node n persistently rise to Vn=VREF-Vth1, wherein Vth1 is the threshold value electricity of first switch unit 10
Pressure, since the 4th switch unit is conducting, so node n and node o are equivalent to short circuit, the voltage at node o is Vo at this time
=Vn, the voltage at 101 both ends of first capacitor unit are Vm-Vo=VREF- (VREF-Vth1)=Vth1, therefore, first switch list
The threshold voltage vt h1 of member 10 is written in first capacitor unit 101, and the threshold voltage vt h1 of first switch unit 10 is stored
In first capacitor unit 101.
In charging stage T3, the first scanning signal becomes low level VGL, and the second scanning signal becomes high level VGH, this
When, second switch unit 20 and the shutdown of the 4th switch unit 40, node m become quick condition, and node m and node n's is separated,
Third switch unit 30 is connected, and initialization voltage signal is set as low level, and data voltage signal Data is set as the second data
Voltage Vdata, power supply voltage signal are set as low level power signal VDD_L, and luminescence unit 103 is in close state, due to
Second scanning signal becomes high level VGH, and the second data voltage Vdata is written to node o, Vo=Vdata, at node m
In quick condition, therefore, the voltage of node m can be flattened because of the coupling of first capacitor unit 101, at this point, Vm=
VREF+ [Vdata- (VREF-Vth1)]=Vdata+Vth1.
In light emitting phase T4, the first scanning signal keeps low level VGL, and the second scanning signal becomes low from high level VGH
Level VGL, at this point, second switch unit 20, third switch unit 30 and the 4th switch unit 40 are turned off, supply voltage letter
Number become high level power supply signal VDD_H, first switch unit 10 is connected, and the voltage at the place node n is begun to ramp up, and flows through and shines singly
The electric current IuLED of member 103 are as follows:
IuLED=1/2*k* [VDD_H+Vth1-VuLED-Vth1]2=1/2*k* [VDD_H-VuLED]2；
Wherein, VData is the second data voltage, and VuLED is the operating voltage of luminescence unit 103, and k is semiconductor layer migration
The relevant constant of rate, k=uCoxW/L, u are the electron mobility of semiconductor layer, and Cox is film transistor device
The unit-area capacitance of Metal-Insulator-Semi-Conductor (metal-insulator-semiconductor, MIS) structure, W/L TFT
The breadth length ratio of channel.
By above formula it is found that the electric current IuLED for flowing through luminescence unit 103 is the threshold voltage with first switch unit 10
The incoherent formula of Vth1, at this point, first switch unit 10 is used as driving unit, the first electronic switching tube m1 is as driving switch
Pipe, therefore, the threshold voltage shift of driving switch pipe to the driving current IuLED of micro- light emitting diode uLED without larger impact,
So as to obtain the display image of high quality.
Fig. 5 is the structural schematic diagram for the display device that one embodiment of the application provides.As shown in figure 5, the present embodiment
In display device 60, comprising:
Display panel 60；And
Control unit 61, control unit 61 and display panel 60 are electrically connected, wherein control unit 61 includes such as above-mentioned
One driving circuit 610.
In one embodiment, display device 60 can be to be provided with any type of display of above-mentioned driving circuit 610
Device, such as liquid crystal display device (Liquid Crystal Display, LCD), Organic Electricity laser display (Organic
Electroluminesence Display, OLED) display device, light emitting diode with quantum dots (Quantum Dot Light
Emitting Diodes, QLED) display device or curved-surface display device etc..
In one embodiment, display panel 62 includes the pixel array being made of multirow pixel and multiple row pixel.
In one embodiment, control unit 61 can pass through universal integrated circuit, such as central processing unit (Central
Processing Unit, CPU), or pass through specific integrated circuit (Application Specific Integrated
Circuit, ASIC) Lai Shixian.
The embodiment of the present application provides the driving circuit, driving method and display device of a kind of display panel, the first scanning
The first scanning signal that line provides controls first switch unit and the 4th switch unit, and the second of the offer of the second scan line
Scanning signal controls data-signal by controlling the turn-on and turn-off of third switch unit, is mentioned by initializing signal source
Driving circuit is initialized for initialization voltage signal, to control the data voltage signal of data line offer to the first electricity
Driving of the power supply voltage signal that appearance unit and the second capacitor cell charge and power supply line provides to luminescence unit, makes
Must flow through luminescence unit electric current be not driven unit threshold voltage influence, avoiding luminescence unit, display occur uneven
Problem.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in a computer-readable storage medium
In, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
The foregoing is merely the optional embodiments of the application, all the application's not to limit the application
Made any modifications, equivalent replacements, and improvements etc., should be included within the scope of protection of this application within spirit and principle.
Claims (10)
1. a kind of driving circuit of display panel characterized by comprising
The input terminal of first switch unit, the first switch unit is connect with power supply line, wherein the power supply line is set as mentioning
Power supply source voltage signal；
Initializing signal source is set as providing initialization voltage signal；
The control terminal of second switch unit, the second switch unit is connect with the first scan line, the second switch unit
Input terminal is connect with initializing signal source, and the control terminal of the output end of the second switch unit and the first switch unit connects
It connects, wherein first scan line is set as providing the first scanning signal, and the second switch unit is set as receiving described the
Scan signal, and controlled according to turn-on and turn-off of first scanning signal to the initialization voltage signal；
The input terminal of third switch unit, the third switch unit is connect with data line, the control of the third switch unit
End is connect with the second scan line, wherein the data line is set as providing data-signal, and second scan line is set as providing
Second scanning signal, the third switch unit are used to receive second scanning signal, and according to second scanning signal
The turn-on and turn-off of the data-signal are controlled；
Luminescence unit, the first end of the luminescence unit are connect with the output end of the first switch unit, the luminescence unit
Second termination public electrode；
First capacitor unit, the first end of the first capacitor unit is connect with the control terminal of the first switch unit, described
The second end of first capacitor unit is connect with the output end of the third switch unit；
Second capacitor cell, the first end of second capacitor are connect with the output end of the third switch unit, and described second
The second end of capacitor cell is connect with the initializing signal source；And
The control terminal of 4th switch unit, the 4th switch unit is connect with first scan line, and the 4th switch is single
The input terminal of member is connect with the output end of the third switch unit, the output end and the luminous list of the 4th switch unit
The first end connection of member.
2. the driving circuit of display panel as described in claim 1, which is characterized in that the first switch unit, described
Two switch units, the third switch unit and the 4th switch unit are electronic switching tube.
3. the driving circuit of display panel as claimed in claim 2, which is characterized in that the electronic switching tube is N-type film
Crystal field effects pipe；
The drain electrode of the N-type film crystal field-effect tube is the input terminal of the electronic switching tube, N-type film crystal field effect
Should pipe source electrode be the electronic switching tube output end, the grid of the N-type film crystal field-effect tube is the electronic cutting
Close the control terminal of pipe.
4. the driving circuit of display panel as described in claim 1, which is characterized in that the first capacitor unit includes first
The second end of capacitor, first end of the first end of the first capacitor as the first capacitor unit, the first capacitor is made
For the second end of the first capacitor unit.
5. the driving circuit of display panel as described in claim 1, which is characterized in that second capacitor cell includes second
The second end of capacitor, first end of the first end of second capacitor as second capacitor cell, second capacitor is made
For the second end of second capacitor cell.
6. the driving circuit of display panel as described in claim 1, which is characterized in that the luminescence unit includes micro- luminous two
Pole pipe, the anode of micro- light emitting diode are the first end of the luminescence unit, and the cathode of micro- light emitting diode is institute
State the second end of luminescence unit.
7. the driving circuit of display panel as claimed in claim 2, which is characterized in that the electronic switching tube is that polysilicon is thin
Any one in film transistor, amorphous silicon film transistor, Zinc oxide based film transistor or Organic Thin Film Transistors.
8. a kind of driving method of such as driving circuit of display panel of any of claims 1-7, which is characterized in that
The driving method includes:
In initial phase, high level is set by first scanning signal, sets low electricity for second scanning signal
It is flat, low level power signal is set by the power supply voltage signal, sets high level for the initialization voltage signal, it will
The data voltage signal is set as the first data voltage；
In the threshold voltage compensation stage, high level is set by first scanning signal, second scanning signal is arranged
For low level, high level power supply signal is set by the power supply voltage signal, sets high for the initialization voltage signal
The data voltage signal is set the first data voltage by level；
In the charging stage, low level is set by first scanning signal, sets high level for second scanning signal,
Low level power signal is set by the power supply voltage signal, low level is set by the initialization voltage signal, by institute
It states data voltage signal and is set as the second data voltage；
In light emitting phase, low level is set by first scanning signal and second scanning signal, by the power supply electricity
Pressure signal is set as high level power supply signal, sets low level for the initialization voltage signal, the data voltage is believed
Number it is set as the first data voltage.
9. driving method as claimed in claim 8, which is characterized in that the driving method further include:
In the initial phase, the voltage of first power supply voltage signal is set smaller than to the work of the luminescence unit
Voltage.
10. a kind of display device characterized by comprising
Display panel；And
Control unit is electrically connected with the display panel, wherein described control unit includes such as any one of claim 1~7
The driving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910054254.4A CN109461424A (en) | 2019-01-21 | 2019-01-21 | A kind of driving circuit of display panel, driving method and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910054254.4A CN109461424A (en) | 2019-01-21 | 2019-01-21 | A kind of driving circuit of display panel, driving method and display device |
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| CN1851791A (en) * | 2005-04-21 | 2006-10-25 | 三星电子株式会社 | Display device and driving method thereof |
| CN101842829A (en) * | 2008-10-07 | 2010-09-22 | 松下电器产业株式会社 | Image display device and method of controlling the same |
| CN102842283A (en) * | 2012-08-14 | 2012-12-26 | 北京大学深圳研究生院 | Pixel circuit, display device and driving method |
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2019
- 2019-01-21 CN CN201910054254.4A patent/CN109461424A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1851791A (en) * | 2005-04-21 | 2006-10-25 | 三星电子株式会社 | Display device and driving method thereof |
| CN101842829A (en) * | 2008-10-07 | 2010-09-22 | 松下电器产业株式会社 | Image display device and method of controlling the same |
| CN102842283A (en) * | 2012-08-14 | 2012-12-26 | 北京大学深圳研究生院 | Pixel circuit, display device and driving method |
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Application publication date: 20190312 |