CN108389551A - A kind of pixel circuit and its driving method, display device - Google Patents
A kind of pixel circuit and its driving method, display device Download PDFInfo
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- CN108389551A CN108389551A CN201810265088.8A CN201810265088A CN108389551A CN 108389551 A CN108389551 A CN 108389551A CN 201810265088 A CN201810265088 A CN 201810265088A CN 108389551 A CN108389551 A CN 108389551A
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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
- G09G3/3258—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 voltage across 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
- 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
A kind of pixel circuit of present invention offer and its driving method, display device, are related to display technology field, can improve because there are pressure drops to cause to show the non-uniform problem of picture brightness on threshold voltage shift and power cord.Pixel circuit includes data write-in sub-circuit, and the first signal end of connection, first voltage end and first point are used for the signal transmission at first voltage end to first point；Sub-circuit is compensated, second signal end and drive sub-circuits are connected, the compensation for drive sub-circuits to be carried out with threshold voltage；Light emitting control sub-circuit, connection enable signal end, drive sub-circuits and luminous sub-circuit, for making drive sub-circuits be connect with luminous sub-circuit；Drive sub-circuits are also connected with, second voltage end and light emitting control sub-circuit at first point, for after obtaining the compensation of threshold voltage, under the control of and light emitting control sub-circuit, the sub-circuit that shines are driven to shine at first point；Shine sub-circuit, tertiary voltage end is also connected with, for shining.
Description
Technical field
The present invention relates to display technology field more particularly to a kind of pixel circuit and its driving method, display devices.
Background technology
Organic electroluminescent LED (Organic Light Emitting Diode, OLED) display is to study at present
One of the hot spot in field is compared with liquid crystal display (Liquid Crystal Display, LCD), and OLED has low energy consumption, life
The advantages that producing at low cost, self-luminous, fast wide viewing angle and corresponding speed.Wherein, pixel circuit design is OLED display core skill
Art content has important research significance.
OLED drive in the prior art drives crystal as shown in Figure 1, since driving transistor Td and OLED connect
The driving current I of pipe TdoledValue can determine brightness caused by OLED device.Driving current IoledFlow through driving transistor
The electric current of Td, is represented by：Wherein, COXFor
The dielectric constant of raceway groove insulating layer, μ are channel carrier mobility, and the two is constant,It is long for the width of driving transistor Td
Than VGSFor the pressure difference of grid and source electrode, VthFor the threshold voltage of driving transistor Td.It follows that OLED current can by W,
L、Vdata、VDD、VthThe influence of five variables.Since a product once completes, its μ, COX, W and L be to determine that, can
To regard a constant as, therefore the light emission luminance of OLED is by Vdata, VDD and VthControl.
Due to the factor of manufacture craft, non-crystalline silicon tft (the Thin Film that are made in large-area glass substrate
Transistor, thin film transistor (TFT)), low-temperature polysilicon film transistor (LTPS TFT) or oxide thin film transistor (Oxide
TFT it) is usually present the distributional difference of threshold voltage vt h, even if there is also differences between the Vth being close together, in addition in stress
The problem of value of lower Vth changes, i.e. Vth drifts about, even if this has resulted in two neighboring sub-pix input brightness data phase
Together, but display brightness also can be variant, here it is we have seen that picture hourglass phenomenon and brightness irregularities occur existing
As.
It shines in addition, the driving of OLED is electric current driving, driving current IoledBigger, luminous brightness is brighter.But
Since there are distributed resistances to generate pressure drop, namely what is often called IR drop (pressure drop) so that edge when flowing through electric current on power cord VDD
When the sub-pix for the extending direction arrangement of VDD is all bright, when vdd line flows through electric current, by each sub-pix, vdd line is just
As soon as declining a small voltage, there are one small pressure drops for the vdd voltage on vdd line to sub-pix, cause along vdd line sub-pix
Vdd voltage gradually reduce, cause formula's
Driving current IoledAlso it tapers into, the brightness of sub-pix can be gradually dimmed, and display brightness is caused to be deposited along the extending direction of VDD
In brightness irregularities.
Invention content
A kind of pixel circuit of the embodiment of the present invention offer and its driving method, display device, can improve because of threshold voltage
There are pressure drops to cause to show the non-uniform problem of picture brightness in drift and power cord.
In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that：
In a first aspect, a kind of pixel circuit is provided, including data write-in sub-circuit, compensation sub-circuit, light emitting control son electricity
Road, drive sub-circuits and luminous sub-circuit；The data are written sub-circuit, the first signal end of connection, first voltage end and
It first point, is used under the control of first signal end, by the signal transmission at the first voltage end to described first point；Institute
Compensation sub-circuit is stated, second signal end and the drive sub-circuits are connected, is used under the control at the second signal end, it is right
The drive sub-circuits carry out the compensation of threshold voltage；The light emitting control sub-circuit, connection enable signal end, driving
Circuit and the luminous sub-circuit, under the control at the enable signal end, making the drive sub-circuits and the hair
Photonic circuit connects；It is electric to be also connected with, second voltage end and light emitting control at described first point for the drive sub-circuits
Road, for after obtaining the compensation of threshold voltage, under the control of described first point and the light emitting control sub-circuit, driving
The luminous sub-circuit shines；The luminous sub-circuit, is also connected with tertiary voltage end, for the drive sub-circuits with
And it shines under the driving at the tertiary voltage end.
Optionally, the drive sub-circuits include：Driving transistor, the first capacitance and the second capacitance；First electricity
Described first point of one end connection of appearance, the other end connects the grid of the driving transistor；One end of second capacitance connects
Described first point, the other end connects the second voltage end；The grid of the driving transistor is also connected with the compensation sub-circuit,
First pole connects the second voltage end, and the second pole connects the compensation sub-circuit and the light emitting control sub-circuit.
Optionally, the compensation sub-circuit includes the first transistor；The grid connection described second of the first transistor
Signal end, the first pole connect the drive sub-circuits, and the second pole connects the drive sub-circuits.
Optionally, the data write-in sub-circuit includes second transistor；Described in the grid connection of the second transistor
First signal end, the first pole connect the first voltage end, described first point of the second pole connection.
Optionally, the light emitting control sub-circuit includes third transistor；Described in the grid connection of the third transistor
Enable signal end, the first pole connect the drive sub-circuits, and the second pole connects the luminous sub-circuit.
Optionally, the luminous sub-circuit includes selfluminous element；The anode connection of the selfluminous element is described to shine
Sub-circuit is controlled, cathode connects the tertiary voltage end.
Second aspect provides a kind of display device, including the pixel circuit described in first aspect.
The third aspect, provides a kind of driving method of pixel circuit, and the driving method includes：In initialization and compensation rank
Section, data are written sub-circuit under the control of the first signal end, the reference voltage that first voltage end inputs are transmitted at first point,
First point of the current potential is initialized；Sub-circuit is compensated under the control at second signal end, drive sub-circuits are carried out
The compensation of threshold voltage；In data write phase, sub-circuit is written under the control of first signal end in the data, by institute
The data voltage for stating the input of first voltage end is transmitted at described first point, the drive sub-circuits to first point of the signal into
Row storage；In glow phase, light emitting control sub-circuit makes the drive sub-circuits and the son that shines under the control at enable signal end
Circuit connects；The luminous sub-circuit, shines under the driving at the drive sub-circuits and tertiary voltage end.
Optionally, the drive sub-circuits include driving transistor, the first capacitance and the second capacitance, the compensation electricity
Road includes the first transistor, and the data write-in sub-circuit includes second transistor；The initialization is specifically wrapped with compensated stage
It includes：The second transistor is opened under the control of first signal end, the reference voltage that the first voltage end is inputted
It is transmitted at described first point, first point of the current potential is written to one end of first capacitance and second capacitance；It is described
The first transistor is opened under the control at the second signal end, makes grid and the connection of the second pole of the driving transistor, right
The driving transistor carries out the compensation of threshold voltage, and the current potential after compensation is written to the other end of first capacitance.
Optionally, the data write phase specifically includes：Control of the second transistor in first signal end
The data voltage that the first voltage end inputs is transmitted at described first point, first point of the current potential is written by lower unlatching
One end of first capacitance and second capacitance.
A kind of pixel circuit of the embodiment of the present invention offer and its driving method, display device, by pixel circuit
Increase compensation sub-circuit, the threshold voltage generated to drive sub-circuits compensates, so as to avoid display panel each section
TFT because threshold voltage shift amount is different, caused by display brightness difference.In addition, compensating sub-circuit by increase, power supply can be reduced
Caused by IR drop on line the problem of display brightness difference, the uniformity of brightness between pixel and pixel is improved.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of structural schematic diagram for pixel circuit that the prior art provides；
Fig. 2 is a kind of structural schematic diagram of pixel circuit provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of each sub-circuit in Fig. 2；
The sequence diagram of Fig. 4 each signals when being for driving pixel circuit shown in Fig. 3；
Fig. 5-8 is the simulation design sketch of pixel circuit provided in an embodiment of the present invention；
Fig. 9 is a kind of pixel circuit drive method flow diagram provided in an embodiment of the present invention.
Reference numeral
Sub-circuit is written in 10- data；20- compensates sub-circuit；30- light emitting control sub-circuits；40- drive sub-circuits；50- is sent out
Photonic circuit；The first signal ends of S1-；S2- second signals end；EM- enable signals end；V1- first voltages end；V2- second voltages
End；V3- tertiary voltages end；The first capacitances of C1-；The second capacitances of C2-；First point of A-；B- second points.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the present invention provides a kind of pixel circuit, as shown in Fig. 2, including data write-in sub-circuit 10, compensation son electricity
Road 20, light emitting control sub-circuit 30, drive sub-circuits 40 and luminous sub-circuit 50.
Specifically, sub-circuit 10 is written in data, the first signal end S1 of connection, the point A of first voltage end V1 and first are used for
Under the control of the first signal end S1, by the signal transmission of first voltage end V1 to the first point A.
Sub-circuit 20 is compensated, second signal end S2 and drive sub-circuits 40 are connected, for the control in second signal end S2
Under system, drive sub-circuits 40 are carried out with the compensation of threshold voltage.
Light emitting control sub-circuit 30, connection enable signal end EM, drive sub-circuits 40 and luminous sub-circuit 50, is used for
Under the control of enable signal end EM, drive sub-circuits 40 is made to be connect with luminous sub-circuit 50.
Drive sub-circuits 40 are also connected with the first point A, second voltage end V2 and light emitting control sub-circuit 30, for obtaining
To after the compensation of threshold voltage, under the control of the first point A and light emitting control sub-circuit 30, the sub-circuit 50 that shines is driven to carry out
It shines.
Shine sub-circuit 50, is also connected with tertiary voltage end V3, in drive sub-circuits 40 and tertiary voltage end V3
It shines under driving.
The embodiment of the present invention provides a kind of pixel circuit, by increasing compensation sub-circuit 20 in pixel circuit, to driving
The threshold voltage that sub-circuit 40 generates compensates, so as to avoid display panel each section TFT because of threshold voltage shift amount
Difference, caused by display brightness difference.In addition, sub-circuit 10 and compensation sub-circuit 20 is written by the way that data are arranged, can reduce
Caused by IR drop on power cord the problem of display brightness difference, the uniformity of brightness between pixel and pixel is improved.
Specifically, as shown in figure 3, drive sub-circuits 40 include：Driving transistor Td, the first capacitance C1 and the second capacitance
C2。
One end of first capacitance C1 connects the first point A, and the other end connects the grid of driving transistor Td.
One end of second capacitance C2 connects the first point A, and the other end connects second voltage end V2.
The grid of driving transistor Td is also connected with compensation sub-circuit 20, and the first pole connects second voltage end V2, and the second pole connects
Connect compensation sub-circuit 20 and light emitting control sub-circuit 30.
Wherein, driving transistor Td is directed to the transistor that selfluminous element (such as OLED) provides driving current, mainly
Function is exactly that gate source voltage is converted to drain-source current.
First capacitance C1 and the second capacitance C2 is storage capacitance, and the first capacitance C1 is used for preserving the threshold of driving transistor Td
Threshold voltage, carries out driving transistor Td the compensation of threshold voltage, and the second capacitance C2 is used for preserving the data voltage of pixel.
It should be noted that drive sub-circuits 40 can also include the multiple transistors in parallel with driving transistor Td.On
It states only to drive sub-circuits 40 for example, other structures identical with 40 function of drive sub-circuits are not another herein
One repeats, but should all belong to the scope of protection of the present invention.
As shown in figure 3, compensation sub-circuit 20 includes the first transistor T1.
The grid of the first transistor T1 connects second signal end S2, and the first pole connects drive sub-circuits 40, the connection of the second pole
Drive sub-circuits 40.
Further specifically, the grid of the first transistor T1 connects second signal end S2, the first pole connects driving transistor
The grid (second point B) of Td, the second pole connect the second pole of driving transistor Td.
It should be noted that compensation sub-circuit 20 can also include the multiple switch crystal in parallel with the first transistor T1
Pipe.It is above-mentioned be only to compensation sub-circuit 20 for example, other structures identical with 20 function of compensation sub-circuit herein
It no longer repeats, but should all belong to the scope of protection of the present invention one by one.
As shown in figure 3, data write-in sub-circuit 10 includes second transistor T2.
The grid of second transistor T2 connects the first signal end S1, and the first pole connects first voltage end V1, the connection of the second pole
First point A.
Wherein, first voltage end V1 is used for transmission data voltage Vdata and reference voltage Vref, for compensating power cord
IR drop on VDD.Reference voltage Vref is switched to data voltage Vdata and will produce voltage difference TP by first voltage end V1.
It should be noted that data write-in sub-circuit 10 can also include that the multiple switch in parallel with second transistor T2 is brilliant
Body pipe.It is above-mentioned be only to data be written sub-circuit 10 for example, other 10 functions of sub-circuit that are written with the data are identical
Structure this is no longer going to repeat them, but should all belong to the scope of protection of the present invention.
As shown in figure 3, light emitting control sub-circuit 30 includes third transistor T3.
The grid of third transistor T3 connects enable signal end EM, and the first pole connects drive sub-circuits 40, the connection of the second pole
Shine sub-circuit 50.
Further specifically, the grid of third transistor T3 connects enable signal end EM, the first pole connects driving transistor
The second pole of Td, the second pole connect the sub-circuit 50 that shines.
It should be noted that light emitting control sub-circuit 30 can also include that the multiple switch in parallel with third transistor T3 is brilliant
Body pipe.It is above-mentioned be only to light emitting control sub-circuit 30 for example, other identical as 30 function of light emitting control sub-circuit
Structure this is no longer going to repeat them, but should all belong to the scope of protection of the present invention.
As shown in figure 3, the sub-circuit 50 that shines includes selfluminous element.
The anode connection light emitting control sub-circuit 30 of selfluminous element, cathode connects tertiary voltage end V3.
Further specifically, the second pole of the anode connection third transistor T3 of selfluminous element, cathode connect third electricity
Pressure side V3.
Pixel circuit provided by the invention includes 4 transistors, 2 storage capacitances, can be with improvement threshold voltage drift and electricity
Simple in structure on the line of source caused by pressure drop the problem of sub-pix brightness disproportionation one, at low cost, aperture opening ratio is big.
Based on the above-mentioned description to each sub-circuit physical circuit, below in conjunction with Fig. 3 and Fig. 4 to above-mentioned pixel-driving circuit
Specific driving process is described in detail.
It should be noted that the first, embodiment of the present invention does not limit the type of the transistor in each sub-circuit, i.e.,
Above-mentioned the first transistor T1, second transistor T2, third transistor T3 and driving transistor Td can be for N-type transistor or
Person's P-type transistor.The transistor that the preferred pixel circuit of the embodiment of the present invention includes is P-type transistor.It is real below the present invention
It is the explanation carried out so that above-mentioned transistor is P-type transistor as an example to apply example.
Wherein, the first of above-mentioned transistor extremely can be drain electrode, second extremely can be source electrode；Alternatively, first extremely can be
Source electrode, second extremely can be drain electrodes.The embodiment of the present invention is not restricted this.
In addition, according to the difference of transistor conductivity mode, the transistor in above-mentioned pixel circuit can be divided into enhanced
Transistor and depletion mode transistor.The embodiment of the present invention is not restricted this.
The second, the embodiment of the present invention is to input low electricity with second voltage end V2 input high level VDD, tertiary voltage end V3
The explanation carried out for flat VSS, tertiary voltage end V3 can also grounding, here high and low only indicate input voltage it
Between relative size relationship.
As shown in figure 4, the driving process of the pixel circuit can be divided into initialization and compensated stage P1, data write phase
P2, glow phase P3.Specifically：
In initialization and compensated stage P1, as shown in figure 4, the first signal end S1, second signal end S2 input low levels are opened
Open signal, enable signal end EM input high level pick-off signals.Based on this, the equivalent circuit diagram of pixel circuit shown in Fig. 3 is such as
Shown in (a) figure in Fig. 5, the first transistor T1, second transistor T2 are opened, third transistor T3 cut-offs, (in cut-off shape
The transistor of state is indicated with beating "×").
Wherein, the first signal end S1 input low level open signals, control second transistor T2 are opened, first voltage end V1
The reference voltage Vref of input is exported to one end of one end of the first capacitance C1 and the second capacitance C2, also through second transistor T2
It is the A points in Fig. 5, the first capacitance C1 and the second capacitance C2 is initialized.Second signal end S2 input low levels open letter
Number, control the first transistor T1 is opened, at this point, as shown in fig. 6, the first transistor T1 is by the grid G of driving transistor Td and the
Two pole D connections so that VGS=VDS=Vth, (a) figure in Fig. 5 can be equivalent to (b) figure in Fig. 5.Second voltage end V2 passes through
Driving transistor Td and the first transistor T1 (drives to the grid (the B points in Fig. 5) of driving transistor Td write-in level VDD+Vth
Dynamic transistor Td is P-type transistor, and Vth values are negative), drive sub-circuits 40 are carried out with the compensation of threshold voltage.Wherein, VDD is
The supply voltage of second voltage end V2, Vth are the threshold voltage of driving transistor Td.
That is, at the end of initialization is with compensated stage P1, the voltage of the first point A is Vref, and the voltage of second point B is VDD+
Vth.The voltage preserved on first capacitance C1 is VDD+Vth-Vref, and the voltage preserved on the second capacitance C2 is Vref-VDD.
In data write phase P2, as shown in figure 4, the first signal end S1 input low level open signals, second signal end
S2, enable signal end EM input high level pick-off signals.Based on this, in the equivalent circuit diagram such as Fig. 7 of pixel circuit shown in Fig. 3
(a) figure shown in, second transistor T2 is opened, and the first transistor T1, third transistor T3 are turned off, at this time driving transistor Td
The characteristic of diode is lost, (a) figure in Fig. 7 can be equivalent to (b) figure in Fig. 7.
Wherein, the first signal end S1 input low level open signals, control second transistor T2 are opened, first voltage end V1
The data voltage Vdata of input is transmitted to one end of one end and the second capacitance C2 of the first capacitance C1 by second transistor T2,
The voltage jump of the first point A is to Vdata at this time, and the voltage of saltus step amount TP=Vdata-Vref, second point B are due to the first capacitance C1
Coupling, become VDD+Vth+Vdata-Vref.
That is, at the end of data write phase P2, the voltage of the first point A is Vdata, and the voltage of second point B is VDD+Vth
+Vdata-Vref.The voltage preserved on first capacitance C1 is VDD+Vth-Vref.
In glow phase P3, enable signal end EM input low level open signals, the first signal end S1 input high levels are cut
Stop signal, second signal end S2 input high level pick-off signals are based on this, and the equivalent circuit diagram of pixel circuit shown in Fig. 3 is such as
Shown in (a) figure in Fig. 8, the first transistor T1 and second transistor T2 are turned off, and third transistor T3 is opened, (a) in Fig. 8
Figure can be equivalent to (b) figure in Fig. 8.
Wherein, enable signal end EM input low level open signals, control third transistor T3 are opened, and make driving transistor
Td is connected to selfluminous element, and the supply voltage VDD of second voltage end V2 outputs is transmitted to drive sub-circuits 40, selfluminous element
It shines under the driving of the supply voltage VSS of drive signal and tertiary voltage end the V3 output exported in drive sub-circuits 40.
That is, the voltage of glow phase P3, the first point A are Vdata, the voltage of second point B is VDD+Vth+Vdata-Vref.
The Vgs=VG-VS=VB-VDD=Vdata-Vref+Vth of driving transistor Td.
At this point, after driving transistor Td is opened, when the sources the grid G- S voltages Vgs of driving transistor Td subtracts driving transistor
When the value that the threshold voltage vt h of Td is obtained is less than or equal to the sources the leakage D- S voltage Vds of driving transistor Td, i.e. Vgs-Vth≤Vds
When, driving transistor Td is at saturation open state, then flows through the driving current I of driving transistor TdoledFor：
Wherein, W/L is the breadth length ratio of driving transistor Td, COXFor the dielectric constant of raceway groove insulating layer, μ is channel carrier
Mobility.
Above-mentioned parameter and the structure of driving transistor Td, first voltage end the V1 data voltage exported and first voltage end
The reference voltage Vref of V1 outputs is related, unrelated with the threshold voltage vt h of driving transistor Td, to eliminate driving transistor
Influences of the threshold voltage vt h of Td to selfluminous element light emission luminance, improves the homogeneity of selfluminous element brightness.
Further, since the driving current of driving transistor Td does not include VDD, therefore pressure drop shadow on vdd line can be solved
The non-uniform problem of display caused by sound.
Furthermore pixel circuit provided by the invention is increased by transmitting Vref and Vdata data by a signal wire
Pixel aperture ratio can further increase the high-resolution realization of pixel.
The embodiment of the present invention also provides a kind of display device, including multiple above-mentioned pixel circuits.
Wherein, above-mentioned display device can be specifically OLED display, Digital Frame, mobile phone, tablet computer, navigator etc.
Product with any display function or component.
The embodiment of the present invention provides a kind of display device, and display device may include multiple pixel unit arrays, each
Pixel unit includes above-mentioned any one pixel circuit.Display device provided in an embodiment of the present invention has aforementioned with the present invention
The identical advantageous effect of pixel circuit that embodiment provides, since pixel circuit has been carried out specifically in the aforementioned embodiment
Bright, details are not described herein again.
The embodiment of the present invention also provides a kind of driving method of pixel circuit, as shown in figure 9, the driving method includes：
S10, in initialization and compensated stage, sub-circuit 10 is written under the control of the first signal end S1 in data, by first
The reference voltage of voltage end V1 inputs is transmitted to the first point A, is initialized to the current potential of the first point A；Compensation sub-circuit 20 exists
Under the control of second signal end S2, drive sub-circuits 40 are carried out with the compensation of threshold voltage.
Specifically, second transistor T2 is opened under the control of the first signal end S1, the ginseng that first voltage end V1 is inputted
It examines voltage and is transmitted to the first point A, the current potential of the first point A is written to one end of the first capacitance C1 and the second capacitance C2.
The first transistor T1 is opened under the control of second signal end S2, and the grid of driving transistor Td and the second pole is made to connect
It is logical, the compensation of threshold voltage is carried out to driving transistor Td, and the current potential after compensation is written to the other end of the first capacitance C1.
S20, in data write phase, sub-circuit 10 is written under the control of the first signal end S1 in data, by first voltage
The data voltage of end V1 inputs is transmitted to the first point A, and drive sub-circuits 40 store the signal of the first point A.
Specifically, second transistor T2 is opened under the control of the first signal end S1, the number that first voltage end V1 is inputted
It is transmitted to the first point A according to voltage, the current potential of the first point A is written to one end of the first capacitance C1 and the second capacitance C2.
S30, in glow phase, light emitting control sub-circuit 30 makes drive sub-circuits 40 under the control of enable signal end EM
It is connect with luminous sub-circuit 50；The sub-circuit 50 that shines shines under the driving of drive sub-circuits 40 and tertiary voltage end V3.
Specifically, third transistor T3 is opened under the control of enable signal end EM, by drive sub-circuits 40 and the son that shines
Circuit 50 is connected to, and the sub-circuit 50 that shines shines under the driving of drive sub-circuits 40 and tertiary voltage end V3.
The embodiment of the present invention provides a kind of driving method of pixel circuit, by increasing compensation sub-circuit in pixel circuit
20, before drive sub-circuits 40 drive the sub-circuit 50 that shines to shine, driving compensation sub-circuit 20 generates drive sub-circuits 40
Threshold voltage compensate, so as to avoid display panel each section TFT because threshold voltage shift amount is different, caused by show
Show luminance difference.In addition, compensating sub-circuit 20 by increase, display brightness is poor caused by can reducing the IR drop on power cord
Different problem improves the uniformity of brightness between pixel and pixel.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of pixel circuit, which is characterized in that including data write-in sub-circuit, compensation sub-circuit, light emitting control sub-circuit, drive
Mover circuit and luminous sub-circuit；
Sub-circuit, the first signal end of connection, first voltage end and, in first signal is written at first point in the data
Under the control at end, by the signal transmission at the first voltage end to described first point；
The compensation sub-circuit connects second signal end and the drive sub-circuits, for the control at the second signal end
Under system, the drive sub-circuits are carried out with the compensation of threshold voltage；
The light emitting control sub-circuit, connection enable signal end, the drive sub-circuits and the luminous sub-circuit, is used for
Under the control at the enable signal end, the drive sub-circuits is made to be connect with the luminous sub-circuit；
The drive sub-circuits are also connected with, second voltage end and the light emitting control sub-circuit at described first point, for
To after the compensation of threshold voltage, under the control of and the light emitting control sub-circuit, the luminous son is driven at described first point
Circuit shines；
The luminous sub-circuit, is also connected with tertiary voltage end, at the drive sub-circuits and the tertiary voltage end
It shines under driving.
2. pixel circuit according to claim 1, which is characterized in that the drive sub-circuits include：Driving transistor,
One capacitance and the second capacitance；
Described first point of one end connection of first capacitance, the other end connects the grid of the driving transistor；
Described first point of one end connection of second capacitance, the other end connects the second voltage end；
The grid of the driving transistor is also connected with the compensation sub-circuit, and the first pole connects the second voltage end, the second pole
Connect the compensation sub-circuit and the light emitting control sub-circuit.
3. pixel circuit according to claim 1, which is characterized in that the compensation sub-circuit includes the first transistor；
The grid of the first transistor connects the second signal end, and the first pole connects the drive sub-circuits, and the second pole connects
Connect the drive sub-circuits.
4. pixel circuit according to claim 1, which is characterized in that the data write-in sub-circuit includes the second crystal
Pipe；
The grid of the second transistor connects first signal end, and the first pole connects the first voltage end, and the second pole connects
Connect at described first point.
5. pixel circuit according to claim 1, which is characterized in that the light emitting control sub-circuit includes third crystal
Pipe；
The grid of the third transistor connects the enable signal end, and the first pole connects the drive sub-circuits, and the second pole connects
Connect the luminous sub-circuit.
6. pixel circuit according to claim 1, which is characterized in that the luminous sub-circuit includes selfluminous element；
The anode of the selfluminous element connects the light emitting control sub-circuit, and cathode connects the tertiary voltage end.
7. a kind of display device, which is characterized in that including claim 1-6 any one of them pixel circuits.
8. a kind of driving method of pixel circuit, which is characterized in that the driving method includes：
In initialization and compensated stage, sub-circuit is written under the control of the first signal end in data, and first voltage end is inputted
Reference voltage is transmitted at first point, is initialized to first point of the current potential；Compensate control of the sub-circuit at second signal end
Under system, drive sub-circuits are carried out with the compensation of threshold voltage；
In data write phase, sub-circuit is written under the control of first signal end in the data, by the first voltage
The data voltage of end input is transmitted at described first point, and the drive sub-circuits store first point of the signal；
In glow phase, light emitting control sub-circuit makes the drive sub-circuits and the son electricity that shines under the control at enable signal end
Road connects；The luminous sub-circuit, shines under the driving at the drive sub-circuits and tertiary voltage end.
9. driving method according to claim 8, which is characterized in that the drive sub-circuits include driving transistor,
One capacitance and the second capacitance, the compensation sub-circuit includes the first transistor, and the data write-in sub-circuit includes second brilliant
Body pipe；The initialization is specifically included with compensated stage：
The second transistor is opened under the control of first signal end, the reference voltage that the first voltage end is inputted
It is transmitted at described first point, first point of the current potential is written to one end of first capacitance and second capacitance；
The first transistor is opened under the control at the second signal end, makes grid and the second pole of the driving transistor
Connection, carries out the driving transistor compensation of threshold voltage, and the another of first capacitance is written in the current potential after compensation
One end.
10. driving method according to claim 9, which is characterized in that the data write phase specifically includes：
The second transistor is opened under the control of first signal end, the data voltage that the first voltage end is inputted
It is transmitted at described first point, first point of the current potential is written to one end of first capacitance and second capacitance.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109584785A (en) * | 2019-01-21 | 2019-04-05 | 惠科股份有限公司 | A kind of driving circuit of display panel, driving method and display device |
| CN110164378A (en) * | 2019-05-09 | 2019-08-23 | 南华大学 | AMOLED pixel circuit and its driving method |
| WO2020052287A1 (en) * | 2018-09-13 | 2020-03-19 | 京东方科技集团股份有限公司 | Pixel circuit and driving method therefor, and display device |
| CN111489696A (en) * | 2020-06-12 | 2020-08-04 | 中国科学院微电子研究所 | Pixel circuit capable of emitting light simultaneously, driving method thereof and display device |
| CN111951718A (en) * | 2019-05-17 | 2020-11-17 | 群创光电股份有限公司 | Display device |
| CN113643662A (en) * | 2020-04-27 | 2021-11-12 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display substrate |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1910642A (en) * | 2004-01-07 | 2007-02-07 | 皇家飞利浦电子股份有限公司 | Electroluminescent display devices comprising an active matrix |
| US20130057174A1 (en) * | 2001-10-26 | 2013-03-07 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting device and driving method thereof |
| CN103839520A (en) * | 2014-02-28 | 2014-06-04 | 京东方科技集团股份有限公司 | Pixel circuit, method for driving pixel circuit, display panel and display device |
| CN104167177A (en) * | 2014-08-15 | 2014-11-26 | 合肥鑫晟光电科技有限公司 | Pixel circuit, organic electroluminescence display panel and display device |
| CN105185306A (en) * | 2015-09-18 | 2015-12-23 | 京东方科技集团股份有限公司 | Pixel circuit, driving method for the pixel circuit, display substrate and display apparatus |
| CN105702214A (en) * | 2016-04-12 | 2016-06-22 | 深圳市华星光电技术有限公司 | AMOLED pixel drive circuit and pixel driving method |
| CN107170412A (en) * | 2017-07-11 | 2017-09-15 | 深圳市华星光电半导体显示技术有限公司 | A kind of AMOLED pixel-driving circuits and image element driving method |
| CN107230451A (en) * | 2017-07-11 | 2017-10-03 | 深圳市华星光电半导体显示技术有限公司 | A kind of AMOLED pixel-driving circuits and image element driving method |
| CN107301845A (en) * | 2017-08-23 | 2017-10-27 | 深圳市华星光电半导体显示技术有限公司 | Pixel-driving circuit and its driving method |
-
2018
- 2018-03-28 CN CN201810265088.8A patent/CN108389551B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130057174A1 (en) * | 2001-10-26 | 2013-03-07 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting device and driving method thereof |
| CN1910642A (en) * | 2004-01-07 | 2007-02-07 | 皇家飞利浦电子股份有限公司 | Electroluminescent display devices comprising an active matrix |
| CN103839520A (en) * | 2014-02-28 | 2014-06-04 | 京东方科技集团股份有限公司 | Pixel circuit, method for driving pixel circuit, display panel and display device |
| CN104167177A (en) * | 2014-08-15 | 2014-11-26 | 合肥鑫晟光电科技有限公司 | Pixel circuit, organic electroluminescence display panel and display device |
| CN105185306A (en) * | 2015-09-18 | 2015-12-23 | 京东方科技集团股份有限公司 | Pixel circuit, driving method for the pixel circuit, display substrate and display apparatus |
| CN105702214A (en) * | 2016-04-12 | 2016-06-22 | 深圳市华星光电技术有限公司 | AMOLED pixel drive circuit and pixel driving method |
| CN107170412A (en) * | 2017-07-11 | 2017-09-15 | 深圳市华星光电半导体显示技术有限公司 | A kind of AMOLED pixel-driving circuits and image element driving method |
| CN107230451A (en) * | 2017-07-11 | 2017-10-03 | 深圳市华星光电半导体显示技术有限公司 | A kind of AMOLED pixel-driving circuits and image element driving method |
| CN107301845A (en) * | 2017-08-23 | 2017-10-27 | 深圳市华星光电半导体显示技术有限公司 | Pixel-driving circuit and its driving method |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020052287A1 (en) * | 2018-09-13 | 2020-03-19 | 京东方科技集团股份有限公司 | Pixel circuit and driving method therefor, and display device |
| US11189228B2 (en) * | 2018-09-13 | 2021-11-30 | Boe Technology Group Co., Ltd. | Pixel circuit, method for driving pixel circuit, and display device |
| CN109584785A (en) * | 2019-01-21 | 2019-04-05 | 惠科股份有限公司 | A kind of driving circuit of display panel, driving method and display device |
| CN109584785B (en) * | 2019-01-21 | 2021-03-26 | 惠科股份有限公司 | Driving circuit and driving method of display panel and display device |
| CN110164378A (en) * | 2019-05-09 | 2019-08-23 | 南华大学 | AMOLED pixel circuit and its driving method |
| CN111951718A (en) * | 2019-05-17 | 2020-11-17 | 群创光电股份有限公司 | Display device |
| CN113643662A (en) * | 2020-04-27 | 2021-11-12 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display substrate |
| CN113643662B (en) * | 2020-04-27 | 2022-09-30 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display substrate |
| CN111489696A (en) * | 2020-06-12 | 2020-08-04 | 中国科学院微电子研究所 | Pixel circuit capable of emitting light simultaneously, driving method thereof and display device |
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