CN110459177A - OLED pixel circuit and display device - Google Patents
OLED pixel circuit and display device Download PDFInfo
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- CN110459177A CN110459177A CN201910818375.1A CN201910818375A CN110459177A CN 110459177 A CN110459177 A CN 110459177A CN 201910818375 A CN201910818375 A CN 201910818375A CN 110459177 A CN110459177 A CN 110459177A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- 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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
Abstract
The present invention provides a kind of OLED pixel circuit and display device, unit, which is provided, by power supply receives the luminous enable signal of the same level, power supply signal is provided for light emitting diode, the same level scanning signal is received by driving signal writing unit again, and by driving signal writing pixel unit, driving unit is set to save driving signal, the driving current of matching driving signal is generated using power supply signal according to driving signal, and then light emitting diode is driven using driving current, the luminous enable signal of the same level is received by error compensation unit again, or next stage shine enable signal and generate thermal compensation signal, to eliminate the error of driving signal writing unit write driver signal, it avoids the problem that generating error of compensation during to threshold voltage drift compensation with this.
Description
Technical field
The present invention relates to field of display technology, more particularly to a kind of OLED pixel circuit 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 product on the market generallys use 7T1C pixel circuit, but it is in the mistake to threshold voltage drift compensation
Cheng Zhong can lead to the problem of error of compensation.
Summary of the invention
The invention mainly solves the technical problem of providing a kind of OLED pixel circuit and display devices, to inhibit to threshold
Error of compensation is led to the problem of during threshold voltage drift compensation.
In order to solve the above technical problems, one technical scheme adopted by the invention is that:
A kind of OLED pixel circuit is provided, the pixel unit including multiple array distributions, each pixel unit respectively include:
Power supply provides unit, receives the same level and shines enable signal, is that pixel unit shines two to shine enable signal according to the same level
Pole pipe provides power supply signal；Driving signal writing unit receives the same level scanning signal, to incite somebody to action under the driving of the same level scanning signal
Driving signal is written to pixel unit；Driving unit, connects driving signal writing unit and power supply provides unit, is saved with being written
Driving signal, and the driving current for matching driving signal is generated according to driving signal and using power supply signal, thus using driving
Streaming current and drive light emitting diode；Error compensation unit, for shining and making by shine enable signal or next stage of the same level
Energy 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 the initialization unit is connected to the driving unit and the light emitting diode, with
The driving unit and the light emitting diode are initialized using the reference signal according to the initializing signal；
Wherein, the tie point between the initialization unit and the driving unit is defined as first node.
Wherein, each pixel unit further comprises: first capacitor comprising the first path terminal and alternate path end,
In, the first path terminal of first capacitor connects driving unit, and alternate path end connects reference signal metal wire.
Wherein, each pixel unit further comprises: first capacitor comprising the first path terminal and alternate path end,
In, the first path terminal of first capacitor connects driving unit, and alternate path end connects power supply signal metal wire.
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 same level and shines enable signal line to receive the luminous enable signal of the same level, the first access
End is connected to the same level power supply signal metal wire to receive power supply signal, and alternate path end is connected to driving unit, wherein first is brilliant
Tie point between the alternate path end of body pipe and driving unit is defined as second node；Second transistor comprising control terminal,
First path terminal and alternate path end, wherein the control terminal of second transistor connects the same level and shines enable signal line to receive this
The luminous enable signal of grade, the first path terminal is connected to driving unit, and alternate path end is connected to light emitting diode, wherein the
Tie point between the first path terminal and driving unit of two-transistor is defined as third node, the alternate path of second transistor
Tie point between end and light emitting diode is defined as fourth node.
Wherein, error compensation 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 connect the same level shine enable signal line with receive the same level shine enable signal,
Or connection next stage shines enable signal line to receive the luminous enable signal of next stage, and generate thermal compensation signal；First path terminal
It is connected to first node, alternate path end is hanging.
Wherein, error compensation unit includes: the second capacitor comprising the first path terminal and alternate path end, wherein second
First path terminal of capacitor connects first node, and alternate path end connects the same level and shines enable signal line to receive the same level and shine and make
Energy signal, or connection next stage shine enable signal line to receive the luminous enable signal of next stage, and generate thermal compensation signal.
Wherein, error compensation unit includes: the second capacitor comprising the first path terminal and alternate path end, wherein second
First path terminal of capacitor connects first node, and alternate path end connects the same level and shines enable signal line to receive the same level and shine and make
Energy signal, and generate thermal compensation signal.
Wherein, driving signal writing unit includes: third transistor comprising control terminal, the first path terminal and second are logical
Terminal, wherein the control terminal of third transistor connects the same level scan signal line to receive the same level scanning signal, and the first path terminal connects
Drive signal line is connected to receive driving signal, alternate path end is connected to third node；4th transistor comprising control
End, the first path terminal and alternate path end, wherein the control terminal of the 4th transistor connects the same level scan signal line to receive the same level
Scanning signal, the first path terminal are connected to second node, and alternate path end is connected to first node；Wherein, driving unit includes:
5th transistor comprising control terminal, the first path terminal and alternate path end, wherein the control terminal connection the of the 5th transistor
One node, the first path terminal are connected to second node, and alternate path end is connected to third node；Wherein, initialization unit includes:
7th transistor comprising control terminal, the first path terminal and alternate path end, wherein the control terminal connection of the 7th transistor is just
Beginningization signal wire is to receive initializing signal, and the first path terminal is connected to first node, and alternate path end is connected to reference signal
Metal wire is to receive reference signal；8th transistor comprising control terminal, the first path terminal and alternate path end, wherein the 8th
For the control terminal connection initializing signal line of transistor to receive initializing signal, the first path terminal is connected to fourth node, and second
Path terminal is connected to reference signal metal wire to receive reference signal.
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
OLED pixel circuit described in above-mentioned any one.
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 this
The luminous enable signal of grade provides power supply signal for light emitting diode, then receives the same level scanning signal by driving signal writing unit
By driving signal writing pixel unit, driving unit is made to save driving signal, and is generated according to driving signal using power supply signal
The driving current of driving signal is matched, and then drives light emitting diode using driving current, then pass through error compensation unit the same level
Shine enable signal or next stage shines enable signal and generates thermal compensation signal, to eliminate the write-in of driving signal writing unit
The error of driving signal avoids the problem that generating error of compensation during to threshold voltage drift compensation with this.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the first embodiment of OLED pixel circuit of the present invention；
Fig. 2 is the structural schematic diagram of the second embodiment of OLED pixel circuit of the present invention；
Fig. 3 is the structural schematic diagram of the 3rd embodiment of OLED pixel circuit of the present invention；
Fig. 4 is the structural schematic diagram of the fourth embodiment of OLED pixel circuit of the present invention；
Fig. 5 is the timing waveform of the OLED pixel circuit of Fig. 2, Fig. 3 and Fig. 4；
Fig. 6 is the structural schematic diagram of the 5th embodiment of OLED pixel circuit of the present invention；
Fig. 7 is the structural schematic diagram of the sixth embodiment of OLED pixel circuit of the present invention；
Fig. 8 is the structural schematic diagram of the 7th embodiment of OLED pixel circuit of the present invention；
Fig. 9 is the timing waveform of the OLED pixel circuit of Fig. 7 and Fig. 8；
Figure 10 is the structural schematic diagram of an embodiment 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 circuit of the present invention.Including multiple arrays point
The pixel unit of cloth, wherein each pixel unit respectively include: power supply provides unit 11, driving signal writing unit 12, driving
Unit 13, error compensation unit 14 and initialization 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 and light emitting diode are connect, and the tie point of initialization unit 15 and driving unit 13 is defined as first node n1.
Wherein, power supply provides unit 11 and connects the luminous enable signal line of the same level and power supply signal metal wire, to receive the same level
Shine enable signal EM_N and power supply signal VDD, is that pixel unit shines two to shine enable signal EM_N according to the same level
Pole pipe provides power supply signal VDD.Driving signal writing unit 12 connects the same level scan signal line and driving signal metal wire, to connect
The same level scanning signal S2_N and driving signal Vdata is received, and by driving signal Vdata under the driving of the same level scanning signal S2_N
It is written to pixel unit.Driving unit 13 connects driving signal writing unit 12 and power supply provides unit 11, is saved and is driven with write-in
Dynamic signal Vdata, and the driving for utilizing power supply signal VDD to generate matching driving signal Vdata according to driving signal Vdata is electric
Stream, to drive light emitting diode using driving current.Initialization unit 15 connects initializing signal metal wire and reference signal
Metal wire, to receive initializing signal S1_N and reference signal Vref, to utilize reference signal according to initializing signal S1_N
Vref initializes driving unit 13 and light emitting diode.
In the present embodiment, first node n1 and power supply, which provide, has error compensation list between the metal wire that unit 11 connects
Member 14, i.e. error compensation unit 14 connect the power supply in first node n1 and the same level pixel unit and provide unit 11, by this
The luminous enable signal EM_N of grade and generate thermal compensation signal, to eliminate 12 write driver signal Vdata of driving signal writing unit
Error.
Specifically, the structural schematic diagram for the second embodiment that Fig. 2 is OLED pixel circuit of the present invention is referred to.The present embodiment
Provide the pixel circuit of 7T2C a kind of, specifically, in the present embodiment, power supply provide unit 11 include the first transistor M1 and
Second transistor M2, driving signal writing unit 12 include third transistor M3 and the 4th transistor M4, and driving unit 13 includes
5th transistor M5, initialization unit 15 include the 7th transistor M7 and the 8th transistor M8, and error compensation unit 14 includes the
Two capacitor C2.
Wherein, it is provided in unit 11 in power supply, the first transistor M1 includes control terminal, the first path terminal and alternate path
End.Wherein, the control terminal of the first transistor M1 connect the same level shine enable signal line with receive the same level shine enable signal EM_N,
First path terminal is connected to the same level power supply signal metal wire to receive power supply signal VDD, and alternate path end is connected to driving unit
13.Wherein, the tie point between the alternate path end and driving unit 13 of the first transistor M1 is defined as second node n2.Second
Transistor M2 includes control terminal, the first path terminal and alternate path end.Wherein, the control terminal of second transistor M2 connects the same level hair
For light enable signal line to receive the luminous enable signal EM_N of the same level, the first path terminal is connected to driving unit 13, alternate path end
It is connected to light emitting diode.Wherein, the tie point between the first path terminal and driving unit 13 of second transistor M2 is defined as
Third node n3, the tie point between the alternate path end of second transistor M2 and light emitting diode are defined as fourth node n4.
Wherein, in driving signal writing unit 12, third transistor M3 includes that control terminal, the first path terminal and second are logical
Terminal.Wherein, the control terminal of third transistor M3 connects the same level scan signal line to receive the same level scanning signal S2_N, and first is logical
Terminal is connected to drive signal line to receive driving signal Vdata, and alternate path end is connected to third node n3.4th transistor
M4 includes control terminal, the first path terminal and alternate path end.Wherein, the control terminal of the 4th transistor M4 connects the same level scanning signal
Line is to receive the same level scanning signal S2_N, and the first path terminal is connected to second node n3, and alternate path end is connected to first node
n1。
Wherein, in driving unit 13, the 5th transistor M5 includes control terminal, the first path terminal and alternate path end.Its
In, the control terminal of the 5th transistor M5 connects first node n1, and the first path terminal is connected to second node n2, and alternate path end connects
It is connected to third node n3.
Wherein, in initialization unit 15, the 7th transistor M7 includes control terminal, the first path terminal and alternate path end.
Wherein, the control terminal connection initializing signal line of the 7th transistor M7 is to receive initializing signal S1_N, the connection of the first path terminal
To first node n1, alternate path end is connected to reference signal metal wire to receive reference signal Vref.8th transistor M8 packet
Include control terminal, the first path terminal and alternate path end.Wherein, the control terminal connection initializing signal line of the 8th transistor M8 is to connect
Receive initializing signal S1_N, the first path terminal is connected to fourth node n4, alternate path end be connected to reference signal metal wire with
Receive reference signal Vref.
It in the present embodiment, further include first capacitor C1, first capacitor C1 includes the first path terminal and alternate path end.Its
In, the first path terminal of first capacitor C1 connects driving unit 13, specifically, connects the 5th transistor M5's of driving unit 13
Control terminal, alternate path end connect reference signal metal wire to receive reference signal Vref.
In error compensation unit 14, the second capacitor C2 includes the first path terminal and alternate path end.Wherein the first access
End connection first node n1, alternate path end connect the same level and shine enable signal line to receive the luminous enable signal EM_N of the same level.
Fig. 3 is referred to, is the structural schematic diagram of the 3rd embodiment of OLED pixel circuit of the present invention.It present embodiments provides
A kind of pixel circuit of 8T1C, compared with above-mentioned second embodiment shown in Fig. 2, difference is: error compensation unit 14 includes
Error compensation transistor M6, the control terminal of error compensation transistor M6 connect the luminous enable signal line of the same level and are shone with receiving the same level
Enable signal EM_N, and then generate thermal compensation signal；First path terminal is connected to first node n1, and alternate path end is hanging.Specifically
Ground, error compensation transistor M6 generates thermal compensation signal by the same level enable signal EM_N that shines, and then driving signal is written single
The driving signal Vdata of 12 write-in of member is compensated.
Fig. 4 is referred to, is the structural schematic diagram of the fourth embodiment of OLED pixel circuit of the present invention.It present embodiments provides
A kind of pixel circuit of 7T2C, compared with above-mentioned second embodiment shown in Fig. 2, difference is: the first of first capacitor C1 is logical
Terminal connects driving unit 13, specifically, connects the control terminal of the 5th transistor M5 of driving unit 13, the connection of alternate path end
Power supply signal metal wire is to receive power supply signal VDD.
Fig. 5 is referred to, is the timing waveform of above-mentioned Fig. 2, Fig. 3 and OLED pixel circuit shown in Fig. 4.
Specifically, in T1 stage, i.e. initial phase, initializing signal S1_N is low level, the 7th transistor M7 and the
Eight transistor M8 conducting；The same level scanning signal S2_N is high level, and third transistor M3 and the 4th transistor M4 are not turned on；The same level
The enable signal EM_N that shines is high level, and the first transistor M1 and second transistor M2 are not turned on.At this point, the sun of light emitting diode
Pole and first capacitor C1 are initialized to reference signal Vref.Specifically, the voltage V of first node n1n1=Vref.
In T2 stage, i.e. data write phase, initializing signal S1_N is high level, the 7th transistor M7 and the 8th crystal
Pipe M8 is not turned on；The same level scanning signal S2_N is low level, third transistor M3 and the 4th transistor M4 conducting；The same level, which shines, to be made
Energy signal EM_N is high level, and the first transistor M1 and second transistor M2 are not turned on.The voltage V of third node n3 at this timen3=
Vdata, the 5th transistor M5 conducting can generate threshold voltage V in conducting since the 5th transistor M5 is driving transistorth,
The voltage of first node n1 is driving signal Vdata and threshold voltage V at this timethThe sum of, i.e. Vn1=Vdata+Vth。
In T3 stage, i.e. light emitting phase, in the process, S2_N jump is high level, and the 4th transistor M4 and third are brilliant
Body pipe M3 is closed, and the 4th transistor M4 channel charge can cause the voltage of first node n1 by coupling injection first node n1
Vn1Rise and generate error delta V1, the T3 stage is divided into T3_1 and T3_2 at this time.
Specifically, in the T3_1 stage, initializing signal S1_N is high level, and the 7th transistor M7 and the 8th transistor M8 are not
Conducting；The same level scanning signal S2_N is high level, and third transistor M3 and the 4th transistor M4 are not turned on；The same level, which shines, enables letter
Number EM_N is low level, the first transistor M1 and second transistor M2 conducting.Flow through the electric current of light emitting diode are as follows: I=k*
(Vgs-Vth) ^2=k* [(Vdata+Vth-VDD)-Vth] ^2=k* [(Vdata-VDD)] ^2.Theoretically in data write phase
At the end of, first node n1 voltage Vn1=Vdata+VthLight emitting phase can be accurately remained to, in fact, S2_N jump is height
Level can cause the voltage V of first node n1n1Rise and generates error delta V1.Therefore, in the T3_2 stage, the same level, which shines, enables letter
Number EM_N remains low level, the first transistor M1 and second transistor M2 conducting, the second transistor in the same level pixel unit
M2 can be by error compensation unit 14 by the voltage V of first node n1n1It drags down, its decline is made to generate error delta V2.
Specifically, OLED pixel circuit as shown in Figures 2 and 4, the second capacitor C2 in error compensation unit 14 is in T3_
When 2 stage, receive low level the same level shine enable signal EM_N when, the second capacitor C2 storage charge in first node n1
Place introduces error delta V2.
Error compensation transistor M6 in OLED pixel circuit error compensation unit 14 as shown in Figure 3 is in the T3_2 stage
When, receive low level the same level shine enable signal EM_N when, first capacitor C1 storage charge flow into error compensation crystal
Pipe M6, and then error delta V2 is introduced at first node n1.
By the voltage V of first node n1 at the end of the T3_1 stagen1It is denoted as Vn1', the first node n1 at the end of T3_1 stage
Voltage Vn1'=Vn1+ Δ V1+ Δ V2=Vdata+Vth+ΔV1+ΔV2.Error e rror=Δ V1+ Δ V2 is compensated at this time, on
The error delta V2 of the error delta V1 and decline that rise cancel out each other, to solve to generate benefit during to threshold voltage drift compensation
Repay the problem of mistake.
Fig. 6 is referred to, is the structural schematic diagram of the 5th embodiment of OLED pixel circuit of the present invention.With shown in above-mentioned Fig. 1
First embodiment compare, difference is: error compensation unit 14 in the present embodiment connects first node n1 and next stage picture
Power supply in plain unit provides unit 111, thermal compensation signal is generated to shine enable signal EM_N+1 by next stage, to disappear
Except the error of 12 write driver signal Vdata of driving signal writing unit.
Specifically, Fig. 7 is referred to, is the structural schematic diagram of the sixth embodiment of OLED pixel circuit of the present invention.This implementation
Example provides the pixel circuit of 8T1C a kind of, and specifically, compared with above-mentioned 3rd embodiment shown in Fig. 3, difference is: at this
In embodiment, the control terminal of the error compensation transistor M6 in error compensation unit 14 connection next stage shine enable signal line with
The luminous enable signal EM_N+1 of next stage is received, and then generates thermal compensation signal；First path terminal is connected to first node n1, and second
Path terminal is hanging.Specifically, error compensation transistor M6 by next stage shine enable signal EM_N+1 generate thermal compensation signal into
And the driving signal Vdata that driving signal writing unit 12 is written is compensated.
Fig. 8 is referred to, is the structural schematic diagram of the 7th embodiment of OLED pixel circuit of the present invention.With shown in above-mentioned Fig. 2
Second embodiment compare, difference is: the first path terminal of the second capacitor C2 of the error compensation unit 14 in the present embodiment
First node n1 is connected, alternate path end connection next stage shines enable signal line to receive the luminous enable signal EM_N of next stage
+1.Specifically, the second capacitor C2 is generated and thermal compensation signal and then is write to driving signal by the next stage enable signal EM_N+1 that shines
The driving signal Vdata for entering the write-in of unit 12 is compensated.
Fig. 9 is referred to, is the timing waveform of above-mentioned Fig. 7 and OLED pixel circuit shown in Fig. 8.
Specifically, in T1 stage, i.e. initial phase, initializing signal S1_N is low level, the 7th transistor M7 and the
Eight transistor M8 conducting；The same level scanning signal S2_N is high level, and third transistor M3 and the 4th transistor M4 are not turned on；The same level
The enable signal EM_N that shines is high level, and the first transistor M1 and second transistor M2 are not turned on.At this point, light-emitting diodes tube anode
Reference signal Vref is initialized to first capacitor C1.Specifically, the voltage V of first node n1n1=Vref.
In T2 stage, i.e. data write phase, initializing signal S1_N is high level, the 7th transistor M7 and the 8th crystal
Pipe M8 is not turned on；The same level scanning signal S2_N is low level, third transistor M3 and the 4th transistor M4 conducting；The same level, which shines, to be made
Energy signal EM_N is high level, and the first transistor M1 and second transistor M2 are not turned on.The voltage V of third node n3 at this timen3=
Vdata, the 5th transistor M5 conducting can generate threshold voltage V in conducting since the 5th transistor M5 is driving transistorth,
The voltage of first node n1 is driving signal Vdata and threshold voltage V at this timethThe sum of, i.e. Vn1=Vdata+Vth。
In T3 stage, i.e. light emitting phase, in the process, S2_N jump is high level, and the 4th transistor M4 and third are brilliant
Body pipe M3 is closed, and the 4th transistor M4 channel charge can cause the voltage of first node n1 by coupling injection first node n1
Vn1Rise and generate error delta V1, the T3 stage is divided into T3_1 and T3_2 at this time.
Specifically, in the T3_1 stage, initializing signal S1_N is high level, and the 7th transistor M7 and the 8th transistor M8 are not
Conducting；The same level scanning signal S2_N is high level, and third transistor M3 and the 4th transistor M4 are not turned on；The same level, which shines, enables letter
Number EM_N is low level, the first transistor M1 and second transistor M2 conducting.Flow through the electric current of light emitting diode are as follows: I=k*
(Vgs-Vth) ^2=k* [(Vdata+Vth-VDD)-Vth] ^2=k* [(Vdata-VDD)] ^2.Theoretically in data write phase
At the end of, first node n1 voltage Vn1=Vdata+VthLight emitting phase can be accurately remained to, in fact, S2_N jump is height
Level can cause the voltage V of first node n1n1Rise and generates error delta V1.Therefore, in the T3_2 stage, next stage shines enabled
Signal EM_N+1 is low level, the first transistor M1 and second transistor M2 conducting, the second crystal in next stage pixel unit
Pipe M2 can be by error compensation unit 14 by the voltage V of first node n1n1It drags down, its decline is made to generate error delta V2.
Specifically, OLED pixel circuit as shown in Figure 7, the error compensation transistor M6 in error compensation unit 14 exist
When the T3_2 stage, receive low level next stage shine enable signal EM_N+1 when, error compensation transistor M6 conducting, leading
Logical moment, need to absorb charge between the first path terminal and alternate path end of error compensation transistor M6 to establish conductive ditch
Road, since first node n1 no current access, the charge of first capacitor C1 storage will be injected into error compensation transistor M6 at this time
The first path terminal and alternate path end, for first node n1 introduce error delta V2, error delta V2 compensating error Δ V1.
OLED pixel circuit as shown in Figure 8, the second capacitor C2 in error compensation unit 14 are received at the T3_2 stage
When shining enable signal EM_N+1 to low level next stage, the charge of the second capacitor C2 storage can introduce at first node n1
Error delta V2, error delta V2 compensating error Δ V1.
By the voltage V of first node n1 at the end of the T3_1 stagen1It is denoted as Vn1', the first node n1 at the end of T3_1 stage
Voltage Vn1'=Vn1+ Δ V1+ Δ V2=Vdata+Vth+ΔV1+ΔV2.Error e rror=Δ V1+ Δ V2 is compensated at this time, on
The error delta V2 of the error delta V1 and decline that rise cancel out each other, to solve to generate benefit during to threshold voltage drift compensation
Repay the problem of mistake.
Referring to Figure 10, it 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 circuit 402.Other devices and function of display device are identical as the device of existing display device and function, In
This is repeated no more.
Specifically, display device can be any in double-side display device, flexible display apparatus, comprehensive screen display device
Kind.Flexible display apparatus can be applied to curved electronic equipment；Double-side display device can be applied to make display device two
The personnel of side can see the device of display content；Comprehensive screen display device can be applied to comprehensive screen mobile phone or other devices,
It is not limited here.
The present invention includes that the display device of the OLED pixel circuit of above-described embodiment specifically can be applied to mobile phone, plate electricity
Any products or components having a display function such as brain, television set, display, laptop, Digital Frame, navigator.It is right
In other essential component parts of display device be it will be apparent to an ordinarily skilled person in the art that having, herein
It does not repeat them here, should not be taken as limiting the invention yet.
In various embodiments of the present invention, OLED pixel circuit only describes part dependency structure, other structures and existing skill
The structure of OLED pixel circuit in art is identical, and details are not described herein.
The above is only embodiments of the present invention, are not intended to limit the scope of the invention, all to utilize the present invention
Equivalent structure or equivalent flow shift made by specification and accompanying drawing content is applied directly or indirectly in other relevant technologies
Field is included within the scope of the present invention.
Claims (10)
1. a kind of OLED pixel circuit, which is characterized in that the pixel unit including multiple array distributions, each pixel unit difference
Include:
Power supply provides unit, receives the luminous enable signal of the same level, to be the pixel according to the luminous enable signal of described the same level
The light emitting diode of unit provides power supply signal；
Driving signal writing unit receives the same level scanning signal, driving signal to be written under the driving of the same level scanning signal
To the pixel 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；
Error compensation unit for shining enable signal by shine enable signal or next stage of the same level, and generates compensation letter
Number, to eliminate the error of driving signal writing unit write driver signal.
2. OLED pixel 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 driving unit and the light emitting diode, to utilize the reference according to the initializing signal
Signal initializes the driving unit and the light emitting diode；Wherein, the initialization unit and the driving are single
Tie point between member is defined as first node.
3. OLED pixel circuit according to claim 2, which is characterized in that each pixel unit further comprises:
First capacitor comprising the first path terminal and alternate path end, wherein the first path terminal of the first capacitor connects institute
Driving unit is stated, alternate path end connects the reference signal metal wire.
4. OLED pixel circuit according to claim 1, which is characterized in that each pixel unit further comprises:
First capacitor comprising the first path terminal and alternate path end, wherein the first path terminal of the first capacitor connects institute
Driving unit is stated, alternate path end connects power supply signal metal wire.
5. OLED pixel circuit according to claim 1, 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 same level and shines enable signal line to receive the luminous enable signal of the same level, and first path terminal is connected to the same level electricity
Source signal metal wire is to receive power supply signal, and the alternate path end is connected to the driving unit, wherein the first crystal
Tie point between the alternate path end of pipe 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 same level and shines enable signal line to receive the luminous enable signal of the same level, and first path terminal is connected to the drive
Moving cell, and the alternate path end is connected to the light emitting diode, wherein first access of the second transistor
Tie point between end and the driving unit is defined as third node, the alternate path end of the second transistor and institute
The tie point stated between light emitting diode is defined as fourth node.
6. OLED pixel circuit according to claim 3, which is characterized in that the error compensation 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 connect the same level shine enable signal line with receive the same level shine enable signal, or connection next stage shine make
Energy signal wire generates thermal compensation signal to receive the luminous enable signal of next stage；First path terminal is connected to described first
Node, the alternate path end are hanging.
7. OLED pixel circuit according to claim 3, which is characterized in that the error compensation unit includes:
Second capacitor comprising the first path terminal and alternate path end, wherein the first path terminal of second capacitor connects institute
First node is stated, alternate path end connects the same level and shines enable signal line to receive the luminous enable signal of the same level, or connects next
The luminous enable signal line of grade generates thermal compensation signal to receive the luminous enable signal of next stage.
8. OLED pixel circuit according to claim 4, which is characterized in that the error compensation unit includes:
Second capacitor comprising the first path terminal and alternate path end, wherein the first path terminal of second capacitor connects institute
First node is stated, alternate path end connects the same level and shines enable signal line to receive the luminous enable signal of the same level, and generates compensation
Signal.
9. OLED pixel circuit according to claim 5, which is characterized in that the driving signal writing unit 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 same level scan signal line to receive the same level scanning signal, and first path terminal is connected to drive signal line to connect
Driving signal is received, 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 the same level scan signal line to receive the same level scanning signal, and first path terminal is connected to the second node,
The alternate path end is connected to the first node；
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；
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 metal wire 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 fourth node, described
Alternate path end is connected to reference signal metal wire to receive the reference signal.
10. a kind of display device, which is characterized in that including such as above-mentioned OLED pixel electricity according to any one of claims 1 to 9
Road.
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