CN110534062A - OLED pixel driving circuit, control method and display device - Google Patents
OLED pixel driving circuit, control method and display device Download PDFInfo
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- CN110534062A CN110534062A CN201910816742.4A CN201910816742A CN110534062A CN 110534062 A CN110534062 A CN 110534062A CN 201910816742 A CN201910816742 A CN 201910816742A CN 110534062 A CN110534062 A CN 110534062A
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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]
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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
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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]
- G09G3/3266—Details of drivers for scan electrodes
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The present invention provides a kind of OLED pixel driving circuit, control method and display device.It include: the pixel unit of multiple array distributions, each pixel unit respectively include: power supply provides unit, driving signal writing unit, driving unit and the first compensating unit.Wherein, power supply provides unit and receives the enable signal that shines, to provide power supply signal for the light emitting diode of pixel unit；Driving signal writing unit receives scanning signal, and driving signal is written to pixel unit；Driving unit generates driving current using power supply signal according to driving signal, to drive light emitting diode；First compensating unit connects first node and luminous enable signal line, to generate thermal compensation signal by luminous enable signal, to eliminate the error of driving signal writing unit write driver signal.Inhibit the compensation error generated during threshold voltage compensation with this.
Description
Technical field
The present invention relates to field of display technology, more particularly to a kind of OLED pixel driving circuit, control method and display
Device.
Background technique
Active (active) matrix/organic light emitting diode (AMOLED) (Active-matrix Organic Light Emitting
Diode, AMOLED) circuit manufacturing process in, due to technique, usually can all there is TFT device parameters threshold voltage
Non-uniform problem will lead to AMOLED brightness irregularities during display, display quality decline.
Mode used by solving the above problems at present is the compensation function by interior pixels circuit or external drive chip
Energy.But external drive usually requires to increase additional chip, improves cost, and increases the complexity of electronic system.
The internal compensation of pixel circuit generally only needs to can be achieved with by the pixel circuit with compensation function to thin film transistor (TFT)
The compensation of threshold voltage shift promotes display quality.
AMOLED pixel circuit with compensation function has differences in principle, and concrete implementation technique is also different,
Therefore compensating in practice not is that absolutely, there are compensation errors.The quality of display depends on compensation error, and compensation error is got over
Small, the luminance difference of panel different location is smaller, and display quality is better.
Summary of the invention
The invention mainly solves the technical problem of providing a kind of OLED pixel driving circuit and display devices, to inhibit to mend
Repay error.
In order to solve the above technical problems, one technical scheme adopted by the invention is that:
There is provided a kind of OLED pixel driving circuit, comprising: the pixel unit of multiple array distributions, each pixel unit difference
Include: that power supply provides unit, be connected to luminous enable signal line, receive the enable signal that shines, with the luminous enable signal of basis
Power supply signal is provided for the light emitting diode of pixel unit；Driving signal writing unit receives scanning signal, in scanning signal
Driving under driving signal is written to pixel unit；Driving unit, connects driving signal writing unit and power supply provides unit,
Driving signal is saved with write-in, and generates the driving current of matching driving signal according to driving signal and using power supply signal,
To drive light emitting diode using driving current；Wherein, driving unit write-in saves at the first node of driving signal
First node metal wire is connect to form the first compensating unit of error with luminous enable signal line, with by luminous enable signal and
Thermal compensation signal is generated, to eliminate the error of driving signal writing unit write driver signal.
Wherein, each pixel unit further comprises: initialization unit, receives initializing signal, and by reference signal
Metal wire and receive reference signal, wherein initialization unit is connected to first node metal wire and light emitting diode, with according to just
Beginningization signal and first node and light emitting diode are initialized using reference signal.
Wherein, it includes: the first transistor that power supply, which provides unit, comprising control terminal, the first path terminal and alternate path end,
Wherein, the control terminal of the first transistor connects the enable signal line that shines to receive luminous enable signal, and the first path terminal is connected to
For power supply signal metal wire to receive power supply signal, alternate path end is connected to driving unit, wherein the second of the first transistor is logical
Tie point between terminal and driving unit is defined as second node；Second transistor comprising control terminal, the first path terminal and
Alternate path end, wherein the control terminal of second transistor, which connects, shines enable signal line to receive luminous enable signal, and first is logical
Terminal is connected to driving unit, and alternate path end is connected to light emitting diode, wherein the first path terminal and drive of second transistor
Tie point between moving cell is defined as third node.
Wherein, driving signal writing unit includes: third transistor comprising control terminal, the first path terminal and second are logical
Terminal, wherein for the control terminal connection scan signal line of third transistor to receive scanning signal, the first path terminal is connected to driving
For signal wire to receive driving signal, alternate path end is connected to third node；4th transistor comprising control terminal, first are led to
Terminal and alternate path end, wherein the control terminal connection scan signal line of the 4th transistor is to receive scanning signal, the first access
End is connected to second node, and alternate path end is connected to first node.
Wherein, driving unit includes: the 5th transistor comprising control terminal, the first path terminal and alternate path end,
In, the control terminal of the 5th transistor connects first node, and the first path terminal is connected to second node, and alternate path end is connected to the
Three nodes.
Wherein, the first compensating unit includes: error compensation transistor comprising control terminal, the first path terminal and second are logical
Terminal, wherein the control terminal of error compensation transistor connects the enable signal line that shines to receive luminous enable signal, the first access
End is connected to first node, and alternate path end is hanging.
Wherein, initialization unit includes: the 7th transistor comprising control terminal, the first path terminal and alternate path end,
In, for the control terminal connection initializing signal line of the 7th transistor to receive initializing signal, the first path terminal is connected to first segment
Point, alternate path end are connected to reference signal line to receive reference signal；8th transistor comprising control terminal, the first access
End and alternate path end, wherein for the control terminal connection initializing signal line of the 8th transistor to receive initializing signal, first is logical
Terminal is connected to light emitting diode, and alternate path end is connected to reference signal line to receive reference signal.
Wherein, each pixel unit further comprises: first capacitor, and first capacitor includes the first path terminal and alternate path
End, wherein the first path terminal connects the first path terminal of the first transistor, and alternate path end connects first node；Second capacitor,
Second capacitor includes the first path terminal and alternate path end, wherein the first path terminal connects first node, the connection of alternate path end
The alternate path end of 8th transistor.
In order to solve the above technical problems, another technical solution used in the present invention is: providing a kind of pixel-driving circuit
Control method, method includes:
Initial phase, initializing signal are low level, and light-emitting diodes tube anode is initialized to reference signal；First segment
The voltage of point is equal to reference signal；
Data write phase, scanning signal are low level, driving signal write-in, driving unit conducting, the first node
Voltage rise, the voltage of third node is equal to driving signal, and the voltage difference of the first node and the third node reduces,
Until the voltage of the first node and the difference of the third node are the threshold voltage of the driving unit, the at this time driving
Unit cut-off, the voltage of the first node is finally the sum of the driving signal and the threshold voltage；
First light emitting phase, the scanning signal jump is high level, and the luminous enable signal jump is low level, institute
The voltage for stating first node rises；
Second light emitting phase, the luminous enable signal jump is low level, and the charge of storage injects the first compensating unit,
And then the voltage pull-down of the first node is improved into compensation precision to inhibit to compensate error.
In order to solve the above technical problems, another technical solution used in the present invention is: a kind of display device is provided, including
Above-mentioned any one OLED pixel driving circuit.
The beneficial effects of the present invention are: being in contrast to the prior art, the present invention provides unit by power supply and receives hair
Light enable signal provides power supply signal according to luminous enable signal for light emitting diode, then is connect by driving signal writing unit
Receiving scanning signal makes driving unit save driving signal driving signal writing pixel unit, and utilizes electricity according to driving signal
Source signal generates the driving current of matching driving signal, and then drives light emitting diode using driving current, wherein driving unit
It is provided with power supply with the first compensating unit of error between unit, to make by shining at the first node of the driving signal of preservation
Energy signal generates thermal compensation signal, to eliminate the error of driving signal writing unit write driver signal according to thermal compensation signal；With
This effectively inhibits compensation error during threshold voltage compensation, improves compensation precision.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the first embodiment of OLED pixel driving circuit of the present invention；
Fig. 2 is the structural schematic diagram of the second embodiment of OLED pixel driving circuit of the present invention；
Fig. 3 is the timing waveform of OLED pixel driving circuit of the present invention；
Fig. 4 is the structural schematic diagram of the display device of that present invention.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples.
It referring to Figure 1, is the structural schematic diagram of the first embodiment of OLED pixel driving circuit of the present invention.OLED pixel drives
Dynamic circuit includes the pixel unit of multiple array distributions, wherein each pixel unit respectively include: power supply provides unit 11, drives
Dynamic signal writing unit 12, driving unit 13 and the first compensating unit 14.In one embodiment, pixel unit further comprises just
Beginningization unit 15.
Wherein, driving unit 13 connects power supply and provides unit 11 and driving signal writing unit 12, and initialization unit 15 connects
Driving unit 13 is connect, driving unit 13 provides the first node metal wire at the first node n1 that unit 11 is connect with power supply and connects
The enable signal line that shines forms the first compensating unit 14.Initialization unit 15 connects first node metal wire.
Wherein, power supply provides unit 11 and connects the enable signal line that shines, and receives the enable signal EM that shines, to make according to shining
Energy signal EM provides power supply signal VDD for light emitting diode；Driving signal writing unit 12 connects scan signal line, receives scanning
Signal SCAN, under the driving of scanning signal SCAN by driving signal VdataIt is written to pixel unit；Driving unit 13 is used for
Write-in saves driving signal Vdata, and according to driving signal VdataAnd power supply signal VDD is utilized to generate matching driving signal Vdata's
Driving current, to drive light emitting diode using driving current.First compensating unit 14 is given birth to by luminous enable signal EM
At thermal compensation signal, to eliminate 12 write driver signal V of driving signal writing unitdataError.Initialization unit 15 receives
Initializing signal RST, and receive reference signal VREF, to utilize reference signal V according to initializing signal RSTREFTo first node
N1 and light emitting diode are initialized.
It specifically, referring to figure 2., is the particular circuit configurations schematic diagram of OLED pixel driving circuit shown in FIG. 1.Its
In, it includes: the first transistor M1 and second transistor M2 that power supply, which provides unit 11,.Wherein, the first transistor M1 include control terminal,
First path terminal and alternate path end, the control terminal of the first transistor M1, which connects, shines enable signal line to receive the enabled letter that shines
Number EM, the first path terminal are connected to power supply signal metal wire to receive power supply signal VDD, and alternate path end is connected to driving unit
13.Tie point between the alternate path end and driving unit 13 of the first transistor M1 is defined as second node n2.Second crystal
Pipe M2 includes control terminal, the first path terminal and alternate path end, and the control terminal of second transistor M2 connects the enable signal line that shines
To receive the enable signal EM that shines, the first path terminal is connected to driving unit 13, and alternate path end is connected to light emitting diode D.
Wherein, the tie point between the first path terminal and driving unit 13 of second transistor M2 is defined as third node n3.
Driving signal writing unit 12 includes: third transistor M3 and the 4th transistor M4.Wherein, third transistor M3 packet
Control terminal, the first path terminal and alternate path end are included, the control terminal connection scan signal line of third transistor M3 is to receive scanning
Signal SCAN, the first path terminal are connected to drive signal line to receive driving signal Vdata, alternate path end is connected to third section
Point n3.4th transistor M4 includes control terminal, the first path terminal and alternate path end, and the control terminal connection of the 4th transistor M4 is swept
Signal wire is retouched to receive scanning signal SCAN, the first path terminal is connected to second node n2, and alternate path end is connected to first segment
Point n1.
Driving unit 13 includes: the 5th transistor M5, and the 5th transistor M5 includes that control terminal, the first path terminal and second are logical
The control terminal of terminal, the 5th transistor M5 connects first node n1, and the first path terminal is connected to second node n2, alternate path end
It is connected to third node n3.
First compensating unit 14 includes: error compensation transistor M6 comprising control terminal, the first path terminal and alternate path
End, the control terminal of error compensation transistor M6 connect the enable signal line that shines to receive luminous enable signal EM, the first path terminal
It is connected to first node n1, alternate path end is hanging.Specifically, the alternate path end of error compensation transistor M6 is not connected to other
Route.
Wherein, initialization unit 15 includes: the 7th transistor M7 and the 8th transistor M8, and the 7th transistor M7 includes control
End, the first path terminal and alternate path end, the control terminal connection initializing signal line of the 7th transistor M7 is to receive initialization letter
Number RST, the first path terminal are connected to first node n1, and alternate path end is connected to reference signal line to receive reference signal VREF。
8th transistor M8 includes control terminal, the first path terminal and alternate path end, and the control terminal of the 8th transistor M8 connects initialization
Signal wire is to receive initializing signal RST, and the first path terminal is connected to light emitting diode D, and alternate path end is connected to reference to letter
Number line is to receive reference signal VREF。
In one embodiment, OLED pixel driving circuit further includes first capacitor C1 and the second capacitor C2.First capacitor C1
Including the first path terminal and alternate path end, the first access of the first path terminal connection the first transistor M1 of first capacitor C1
End, alternate path end connect first node n1.Second capacitor C2 includes the first path terminal and alternate path end, and the first path terminal connects
Connect first node n1, the alternate path end of alternate path end connection.
The OLED pixel driving circuit proposed in the present embodiment is 8T2C circuit, can be had during threshold voltage compensation
Effect inhibits compensation error, improves compensation precision.Specifically, Fig. 3 is referred to, is the timing of the OLED pixel driving circuit of the application
Waveform diagram.
In t1 stage, i.e. initial phase, initializing signal RST is low level, the 7th transistor M7 and the 8th transistor
M8 conducting；Scanning signal SCAN is high level, and third transistor M3 and the 4th transistor M4 are not turned on；Shine enable signal EM be
High level, the first transistor M1 and second transistor M2 are not turned on.At this point, light emitting diode D anode and first capacitor C1 and
Two capacitor C2 are initialized to reference signal VREF.The voltage V of first node n1n1=VREF。
In t2 stage, i.e. data write phase, initializing signal RST is high level, the 7th transistor M7 and the 8th crystal
Pipe M8 is not turned on；Scanning signal SCAN is low level, third transistor M3 and the 4th transistor M4 conducting；Shine enable signal EM
For high level, the first transistor M1 and second transistor M2 are not turned on.Driving signal V at this timedataWrite-in, the 5th transistor M5 are led
It is logical, it charges to first capacitor C1 and the second capacitor C2, the voltage rapid increase of first node n1, the voltage of third node n3
It remains unchanged, is Vn3=Vdata, first node n1 and the voltage difference of third node n3 are reduced rapidly, until the voltage of first node
Vn1With third node Vn3Difference be the 5th transistor M5 threshold voltage, the 5th transistor M5 ends at this time, first node at this time
The voltage of n1 is finally driving signal VdataWith threshold voltage VthThe sum of, i.e. Vn1=Vdata+Vth.It should be noted that at this time
VthFor a negative voltage.
In t3 stage, i.e. light emitting phase, in the process, scanning signal SCAN jump is high level, third transistor M3
And the 4th transistor M4 close, shine enable signal EM jump be low level, the first transistor M1 and second transistor M2 conducting,
The electric current of light emitting diode D is flowed through at this time are as follows:
I=k* (Vgs-Vth) ^2=k* [(Vdata+ Vth-VDD)-Vth] ^2=k* [(Vdata-VDD)]^2
Theoretically at the end of t2 stage (data write phase), voltage, that is, first node n1 of first capacitor C1 storage
Voltage Vn1=Vdata+VthT3 stage (light emitting phase) can be accurately remained to, the electric current for flowing through light emitting diode D is I, still
Actually during t2 stage (data write phase) arrives t3 stage (light emitting phase), there are a reaction time Δ t, in Δ
In the t period, during jump, coupling can act on first node by scanning signal SCAN and luminous enable signal EM
N1 introduces an error voltage.Specifically, when scanning signal SCAN jump is high level, the 4th transistor M4 is closed, and the 4th is brilliant
The channel charge of body pipe M4, which can shift, causes the voltage of first node n1 to rise, i.e. Vn1Rise, introduces error+Δ V1, at this point, the
The voltage of one node n1 is Vn1'=Vdata+Vth+ΔV1.After this, the enable signal EM jump that shines is low level, and error is mended
Transistor M6 conducting is repaid, moment is connected in error compensation transistor M6, (first is logical for the source electrode of error compensation transistor M6 and drain electrode
Terminal and alternate path end) between need to absorb charge to establish conducting channel, first capacitor C1 and/or the second capacitor C2 at this time
Storage charge can Injection Error compensation transistor M6 source electrode and drain electrode (the first path terminal and alternate path end), and then the
Error delta V2 is introduced at one position node n1, error delta V2 at this time is a negative voltage, i.e. drop-out voltage, error delta V2 can make
First node n1 voltage Vn1'=Vdata+Vth+ Δ V1 declines, at this time first node n1 voltage Vn1"=Vdata+Vth+ΔV1-ΔV2
=Vn1+ Δ V1- Δ V2, i.e. compensation error are error=Δ V1- Δ V2.Since error delta V1 is raised voltage, Δ V2 is decline
Voltage, compensation error are suppressed.
In the present embodiment, the first compensating unit (error is arranged by the above method in the OLED pixel driving circuit of 8T2C
Compensate transistor M6), the compensation error generated during threshold voltage compensation is inhibited with realizing.
Fig. 4 is referred to, is the structural schematic diagram of the display device of that present invention.Display device 401 includes any of the above-described embodiment
In OLED pixel driving circuit 402.The device of other devices and function of display device 401 and existing display device 401
And function is identical, details are not described herein.
Specifically, display device 401 can be in double-side display device, flexible display apparatus, comprehensive screen display device
It is a kind of.Flexible display apparatus can be applied to curved electronic equipment；Double-side display device can be applied to make display device
The personnel of two sides can see the device of display content；Comprehensive screen display device can be applied to comprehensive screen mobile phone or other dresses
It sets, it is not limited here.
The present invention includes the display device 401 of the OLED pixel driving circuit 402 of above-described embodiment, specifically be can be applied to
Any production having a display function such as mobile phone, tablet computer, television set, display, laptop, Digital Frame, navigator
Product or component.Other essential component parts for display device 401 are that those skilled in the art should
What understanding had, this will not be repeated here, also should not be taken as limiting the invention.
In various embodiments of the present invention, the OLED pixel driving circuit only describes part interlock circuit, other circuits
Identical as the circuit of OLED pixel driving circuit in the prior art, details are not described herein.
OLED pixel driving circuit provided by the present application and display device are single by setting connection power supply offer unit, driving
The first compensating unit (error compensation transistor M6) of first and luminous enable signal line, to realize during threshold voltage compensation
Effectively inhibit compensation error, improves the purpose of compensation precision.
Mode the above is only the implementation of the present invention is not intended to limit the scope of the invention, all to utilize this
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field is included within the scope of the present invention.
Claims (10)
1. a kind of OLED pixel driving circuit, which is characterized in that the pixel unit including multiple array distributions, each pixel unit
Respectively include:
Power supply provides unit, is connected to luminous enable signal line, the enable signal that shines is received, according to the luminous enable signal
And the light emitting diode for the pixel unit provides power supply signal；
Driving signal writing unit receives scanning signal, driving signal to be written to the picture under the driving of scanning signal
Plain unit；
Driving unit, connects the driving signal writing unit and the power supply provides unit, saves the driving letter with write-in
Number, and the driving current for matching the driving signal is generated using the power supply signal according to the driving signal, thus
The light emitting diode is driven using the driving current；
Wherein, the driving unit write-in saves first node metal wire and the hair at the first node of the driving signal
Light enable signal line is connected to form the first compensating unit of error, to generate thermal compensation signal by the luminous enable signal,
To eliminate the error that the driving signal is written in the driving signal writing unit.
2. OLED pixel driving circuit according to claim 1, which is characterized in that each pixel unit further comprises:
Initialization unit receives initializing signal, and receives reference signal by reference signal metal wire, wherein described first
Beginningization unit is connected to the first node metal wire and the light emitting diode, to utilize institute according to the initializing signal
Reference signal is stated to initialize the first node and the light emitting diode.
3. OLED pixel driving circuit according to claim 2, which is characterized in that the power supply provides unit and includes:
The first transistor comprising control terminal, the first path terminal and alternate path end, wherein the first transistor it is described
Control terminal connects the luminous enable signal line to receive the luminous enable signal, and first path terminal is connected to power supply letter
Number metal wire is to receive power supply signal, and the alternate path end is connected to the driving unit, wherein the first transistor
Tie point between the alternate path end and the driving unit is defined as second node；
Second transistor comprising control terminal, the first path terminal and alternate path end, wherein the second transistor it is described
Control terminal connects the luminous enable signal line to receive the luminous enable signal, and first path terminal is connected to the drive
Moving cell, the alternate path end are connected to the light emitting diode, wherein first path terminal of the second transistor
Tie point between the driving unit is defined as third node.
4. OLED pixel driving circuit according to claim 3, which is characterized in that the driving signal writing unit packet
It includes:
Third transistor comprising control terminal, the first path terminal and alternate path end, wherein the third transistor it is described
Control terminal connects the scan signal line to receive scanning signal, and first path terminal is connected to drive signal line to receive and drive
Dynamic signal, the alternate path end is connected to the third node；
4th transistor comprising control terminal, the first path terminal and alternate path end, wherein the 4th transistor it is described
Control terminal connects scan signal line to receive scanning signal, and first path terminal is connected to the second node, and described second
Path terminal is connected to the first node.
5. OLED pixel driving circuit according to claim 3, which is characterized in that the driving unit includes:
5th transistor comprising control terminal, the first path terminal and alternate path end, wherein the 5th transistor it is described
Control terminal connects the first node, and first path terminal is connected to the second node, and the alternate path end is connected to
The third node.
6. OLED pixel driving circuit according to claim 3, which is characterized in that first compensating unit includes:
Error compensation transistor comprising control terminal, the first path terminal and alternate path end, wherein the error compensation crystal
The control terminal of pipe, which connects, shines enable signal line to receive luminous enable signal, and first path terminal is connected to described the
One node, the alternate path end are hanging.
7. OLED pixel driving circuit according to claim 3, which is characterized in that the initialization unit includes:
7th transistor comprising control terminal, the first path terminal and alternate path end, wherein the 7th transistor it is described
Control terminal connects initializing signal line to receive initializing signal, and first path terminal is connected to the first node, described
Alternate path end is connected to reference signal line to receive the reference signal；
8th transistor comprising control terminal, the first path terminal and alternate path end, wherein the 8th transistor it is described
Control terminal connects initializing signal line to receive initializing signal, and first path terminal is connected to the light emitting diode, institute
It states alternate path end and is connected to reference signal line to receive the reference signal.
8. described in any item pixel-driving circuits according to claim 1~7, which is characterized in that each pixel unit into
One step includes:
First capacitor, the first capacitor include the first path terminal and alternate path end, wherein first path terminal connects institute
The first path terminal of the first transistor is stated, the alternate path end connects the first node；
Second capacitor, second capacitor include the first path terminal and alternate path end, wherein first path terminal connects institute
First node is stated, the alternate path end connects the alternate path end of the 8th transistor.
9. a kind of control method of pixel-driving circuit, which is characterized in that the pixel-driving circuit is claim 1~8 times
Pixel-driving circuit described in one, which comprises
Initial phase, initializing signal are low level, and light-emitting diodes tube anode is initialized to reference signal；First node
Voltage is equal to reference signal；
Data write phase, scanning signal are low level, driving signal write-in, driving unit conducting, the electricity of the first node
Pressure rises, and the voltage of third node is equal to driving signal, and the voltage difference of the first node and the third node reduces, until
The difference of the voltage of the first node and the third node is the threshold voltage of the driving unit, at this time the driving unit
Cut-off, the voltage of the first node is finally the sum of the driving signal and the threshold voltage；
First light emitting phase, scanning signal jump are high level, and the luminous enable signal jump is low level, described the
The voltage of one node rises；
Second light emitting phase, the luminous enable signal jump is low level, and the charge of storage injects the first compensating unit, in turn
The voltage pull-down of the first node is improved into compensation precision to inhibit to compensate error.
10. a kind of display device, which is characterized in that including such as above-mentioned OLED pixel driving according to any one of claims 1 to 9
Circuit.
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Application publication date: 20191203 |