CN105489167B - Display device and its pixel circuit and driving method - Google Patents
Display device and its pixel circuit and driving method Download PDFInfo
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- CN105489167B CN105489167B CN201510890674.8A CN201510890674A CN105489167B CN 105489167 B CN105489167 B CN 105489167B CN 201510890674 A CN201510890674 A CN 201510890674A CN 105489167 B CN105489167 B CN 105489167B
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Abstract
This application involves display device and its pixel circuit and driving method, pixel circuit includes driving transistor, light-emitting component, drive control transistor, data writing transistor and storage capacitance, wherein, driving transistor is used to that light-emitting component to be driven to shine；Data writing transistor is used to, when the scanning signal of scan signal line is effective, provide the voltage of data-signal；Drive control transistor is used in response LED control signal, the compensation for completing threshold value and mobility and the voltage write driver transistor by the data-signal provided；Storage capacitance is used to provide the threshold voltage of driving transistor during valve value compensation.The mutual cooperation that the application passes through each transistor and storage capacitance, complete the compensation of threshold value and mobility, it solves display panel and shows problem of non-uniform caused by drive transistor threshold voltage difference everywhere, it shows that the uniformity reduces problem caused by driving tube mobility change can be compensated, further improves the uniformity of display.
Description
Technical field
This application involves display device technical fields, and in particular to a kind of display device and its pixel circuit and driving side
Method.
Background technology
Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED) display is because with high brightness, height
It is the advantages that luminous efficiency, wide viewing angle and low-power consumption, widely studied by people in recent years, and the display of a new generation is applied to rapidly
In the middle.The type of drive that OLED is shown can be divided into passive waked-up (Passive Matrix OLED, PMOLED) and active
Two kinds of matrix driving (Active Matrix OLED, AMOLED).Research shows that passive waked-up is although of low cost, but
It is that there are cross-talk phenomenons, it is impossible to realize high-resolution display, and passive waked-up electric current is big, reduces making for OLED
Use the service life.In contrast, the transistor that driven with active matrix mode sets number different on each pixel is kept away as current source
Cross-talk is exempted from, required driving current is smaller, and power consumption is relatively low, makes the service life of OLED increase, and can realize high-resolution aobvious
Show, meanwhile, driven with active matrix is easier the needs for meeting large area and high grade grey level is shown.
The pixel circuit of traditional AMOLED be simple two thin film field effect transistor (Thin Film Transistor,
TFT) structure, this circuit is although simple in structure, but be unable to compensation for drive transistor T1 and OLED threshold voltage shift or because
TFT devices are made of polycrystalline material and cause the threshold voltage inhomogeneities of panel TFT devices everywhere, can not compensate driving
The mobility change of pipe T1.When driving transistor T1 threshold voltages and mobility generation drift or the value on panel everywhere differ
During cause, driving current IDS (electric current between the Drain-Source of T1) changes, and pixel different on panel is because of bias voltage
Difference and make OLED threshold voltages that different degrees of drift occur, so as to cause the inhomogeneities of Display panel.
The content of the invention
The application provides a kind of pixel circuit and driving method and its display device, with compensation for drive transistor and photophore
The uneven or threshold voltage shift of the threshold voltage of part, and the threshold voltage for improving driving transistor is uneven.
According in a first aspect, provide a kind of pixel circuit in a kind of embodiment of the application, including：Driving transistor shines
Element, drive control transistor, data writing transistor and storage capacitance, wherein, the driving transistor connection is described to shine
Element, for the light-emitting component to be driven to shine；The data writing transistor connects data signal line, signal scanning respectively
Line, the drive control transistor and the storage capacitance, for when the scanning signal of the scan signal line is effective, ringing
The data-signal of the data signal line is answered to provide the voltage of the data-signal；The drive control transistor connects respectively
LED control signal line, the driving transistor and the data writing transistor, for responding the LED control signal,
The compensation for completing threshold value and mobility and the voltage write-in institute for the data-signal that the data writing transistor is provided
State driving transistor；The storage capacitance is also connected with the light-emitting component, for carrying out threshold value for the drive control transistor
The threshold voltage of the driving transistor is provided during compensation.
According to second aspect, a kind of pixel circuit drive method is provided in a kind of embodiment of the application, applied to as above institute
The pixel circuit stated, each drive cycle of pixel circuit include initial phase, the valve value compensation stage, data write phase,
Mobility compensated stage and glow phase, driving method include：In the initial phase, lead the drive control transistor
It is logical, initialize the voltage of one end of the connection driving transistor of the storage capacitance and the light-emitting component；In the threshold
It is worth compensated stage, the drive control transistor is held on, to provide reference voltage for the driving transistor, to described
Driving transistor charges until driving transistor shut-off, extracts the threshold voltage of the driving transistor and be stored in described
Storage capacitance；In the data write phase, the drive control transistor is turned off, leads the data writing transistor
It is logical so that the voltage of one end of the connection driving transistor of the light-emitting component is refreshed, and the storage capacitance stores institute
Between the voltage for stating one end of the connection driving transistor of the voltage and the light-emitting component of data writing transistor output
Voltage difference；In the mobility compensated stage, the data writing transistor is held on, and makes the drive control transistor
Conducting, the driving transistor conducting, the voltage of one end of the connection driving transistor of the light-emitting component is through the drive
Dynamic transistor lifting so that the both ends of the storage capacitance form the reference voltage of luminescence process；In the glow phase, make institute
The shut-off of data writing transistor is stated, the drive control transistor is held on, and the driving transistor is according to the storage electricity
The voltage difference for holding both ends generates required glow current, and the light-emitting component is driven to shine
According to the third aspect, a kind of display device is provided in a kind of embodiment of the application, including：Pixel circuit matrix, institute
Stating pixel circuit matrix includes the pixel circuit as described above for being arranged in N row M column matrix, and N and M are positive integer；Raster data model
Circuit provides for generating scanning signal, and passing through each line scan signals line formed along the first direction to the pixel circuit
Required control signal；Data drive circuit for generating the data-signal for representing half-tone information, and passes through shape in a second direction
Into each data signal line to the pixel circuit provide data-signal；Controller, for respectively to the gate driving circuit
Control sequential is provided with the data drive circuit.
The embodiment of the present application passes through driving transistor, drive control transistor, data writing transistor and storage capacitance
It cooperates, completes the compensation of threshold value and mobility, then by data-signal write driver transistor, driven by driving transistor
Dynamic light-emitting component shines, and uneven ask is shown caused by drive transistor threshold voltage difference everywhere so as to solve display panel
Topic shows that the uniformity reduces problem, further improves the uniformity of display caused by can compensating driving tube mobility change.
Description of the drawings
Fig. 1 is a kind of image element circuit structure figure disclosed in the embodiment of the present application one；
Fig. 2 is the driver' s timing figure of pixel circuit shown in Fig. 1；
Fig. 3 is a kind of image element circuit structure figure disclosed in the embodiment of the present application two；
Fig. 4 a are a kind of driver' s timing figure of pixel circuit shown in Fig. 3；
Fig. 4 b are another driver' s timing figure of pixel circuit shown in Fig. 3；
Fig. 5 is a kind of image element circuit structure figure disclosed in the embodiment of the present application three；
Fig. 6 is the driver' s timing figure of pixel circuit shown in Fig. 5；
Fig. 7 a are a kind of image element circuit structure figure disclosed in the embodiment of the present application four；
Fig. 7 b another image element circuit structure figures disclosed in the embodiment of the present application four；
Fig. 7 c another image element circuit structure figure disclosed in the embodiment of the present application four；
Fig. 8 is the driver' s timing figure of pixel circuit shown in Fig. 7 a；
Fig. 9 is a kind of image element circuit structure figure disclosed in the embodiment of the present application five；
Figure 10 a are a kind of driver' s timing figure of pixel circuit shown in Fig. 9；
Figure 10 b are another driver' s timing figure of pixel circuit shown in Fig. 9；
Figure 11 is a kind of image element circuit structure figure disclosed in the embodiment of the present application six；
Figure 12 is the driver' s timing figure of pixel circuit shown in Figure 11；
Figure 13 is a kind of image element circuit structure figure disclosed in the embodiment of the present application seven；
Figure 14 is the driver' s timing figure of pixel circuit shown in Figure 12；
Figure 15 is a kind of display device structure principle schematic disclosed in one embodiment of the application.
Specific embodiment
The application is described in further detail below by specific embodiment combination attached drawing.Wherein identical label table
Show identical element.
Some terms are illustrated first.Transistor in each embodiment of the application can be the crystal of any structure
Pipe, such as bipolar transistor (BJT) or field-effect transistor (FET).When transistor is bipolar transistor, control
Pole refers to the base stage of bipolar transistor, and first extremely can be the collector or emitter of bipolar transistor, corresponding second
Extremely can be the emitter or collector of bipolar transistor, in actual application, " emitter " and " collector " can be with
Basis signal is flowed to and exchanged.When transistor is field-effect transistor, control pole refers to the grid of field-effect transistor, the
One extremely can be drain electrode or the source electrode of field-effect transistor, and corresponding second extremely can be source electrode or the leakage of field-effect transistor
Pole, in actual application, " source electrode " and " drain electrode " can be with basis signal flows to and exchanges.Transistor in display device leads to
Often it is thin film transistor (TFT) (TFT), is a kind of field-effect transistor.The application is described in detail by taking TFT as an example below.
Light-emitting component in one embodiment of the application is Organic Light Emitting Diode (Organic Light-Emitting
Diode, OLED), but it is not limited to this, in other embodiments or other types of light-emitting component.Light-emitting component
One end (being known as first end) is anode, and correspondingly, the other end (being known as second end) is cathode.
First level terminal and second electrical level end are the both ends of the power supply provided by pixel circuit work.In a kind of embodiment
In, the first level terminal can be high level end VDD, second electrical level end is low level end VSSOr ground wire, in other embodiments,
It can adaptively replace.It should be noted that：For pixel circuit, the first level terminal (such as high level end VDD) and
Second electrical level end (such as low level end VSS) be not the application pixel circuit a part, in order to make those skilled in the art more preferable
Ground understands the technical solution of the application, and is specifically incorporated the first level terminal and second electrical level end is described by.
It should be noted that for convenience, it is more clearly understood that the application's also for those skilled in the art are made
Technical solution introduces first node A and section point B in present specification and circuit structure relevant portion is identified, it is impossible to
Regard as the terminal additionally introduced in circuit.In addition, for convenience of description, high level uses VHCharacterization, low level use VLCharacterization.
Transistor in the embodiment of the present application is described by taking N-type TFT as an example, it should be appreciated that is provided according to the application
Thought can also use the pixel circuit based on p-type or N-type and p-type accordingly.
As shown in figure 15, one embodiment of the application provides a kind of display device, including：Display panel 100, grid drive
Dynamic circuit 200, data drive circuit 300 and controller 400.
Display panel 100 include be arranged in n row m column matrix multiple pixel circuit Pixel [1] [1] ..., Pixel
[n] [m], the multi-strip scanning line Gate [1] of the first direction being connected with each pixel circuit (such as laterally) ..., Gate
[n] and a plurality of data lines Data [1] for the second direction (such as longitudinal) being connected with each pixel ..., Data [m].Its
In, n and m are the integer more than 0；The pixel circuit of Pixel [n] [m] characterization line n m row, in this embodiment, pixel circuit
The pixel circuit provided using another embodiment of the application；Gate [n] represents the corresponding scan line of line n pixel circuit, is used for
Scanning signal is provided to the pixel circuit of corresponding line；Data [m] represents the corresponding data cable of m row pixel circuits, for phase
The pixel circuit that should be arranged provides data voltage.Display panel 100 can be liquid crystal display panel, organic electroluminescence display panel, electricity
Sub- paper display panel etc., and corresponding display device can be liquid crystal display, organic light emitting display, electric paper display
Deng.
Gate driving circuit 200 passes through each horizontal scanning line formed along the first direction for generating scanning pulse signal
Gate [1] ..., Gate [n], to corresponding pixel circuit provide needed for control signal, with complete to picture element matrix by
Row scanning.
The signal output part of data drive circuit 300 is coupled to data cable Data corresponding in display panel 100
[1] ..., on Data [m], the data voltage signal V of the generation of data drive circuit 300DATAPass through data cable Data [1] ...
Data [m] is transferred in corresponding pixel unit to realize gradation of image.
Controller 400 to gate driving circuit 200 and data drive circuit 300 for providing control sequential respectively, with control
The sequential of whole display device action processed.Controller 400 divides with gate driving circuit 200 and data drive circuit 300 in diagram
From, however in other embodiments, controller 400 can also be individually integrated into gate driving circuit 200 and data drive circuit
In 300.
The pixel circuit involved by the application is described in detail below by way of multiple embodiments.
Embodiment one：
It please refers to Fig.1, is a kind of image element circuit structure figure disclosed in the present embodiment, including：It is connected on the first level terminal VDD
Driving transistor T1 and light-emitting component OLED and drive control transistor between the GND of second electrical level end is (for ease of combining
Diagram description, also referred to as second transistor) T2, data writing transistor (for ease of combine diagram description, also referred to as the 3rd
Transistor) T3 and storage capacitance C1.
The first pole of driving transistor T1 is coupled to the first level terminal VDD, the second pole of driving transistor T1 is coupled to luminous
The first end (the two connection part is known as section point B herein) of element OLED, the second end of light-emitting component OLED is coupled to
Second electrical level end GND.In one embodiment, please refer to Fig.1, the first end of light-emitting component OLED is anode, light-emitting component
The second end of OLED is cathode.
The control pole of driving transistor T1 is coupled to the second electrode of second transistor T2, the first electricity of second transistor T2
Pole is coupled to the second electrode (the two connection part is known as first node A herein) of third transistor T3, second transistor T2
Control pole coupled to LED control signal line, for responding LED control signal VEM。
The first electrode of third transistor T3 is coupled to data signal line, and the second electrode of third transistor T3 is coupled to the
The first electrode of two-transistor T2, the control pole of third transistor T3 is coupled to scan signal line, for responding scanning signal
VSCAN.In a particular embodiment, data signal line is used to provide data-signal VDATAWith reference voltage VREF, in other embodiments
In, data signal line can be also used for providing initialization voltage.
Storage capacitance C1 is coupled between first node A and section point B.
The drive signal waveform figure of pixel circuit is as shown in Fig. 2, a frame in the pixel circuit course of work in the present embodiment
Time T (a frame cycle) can be divided into five stages：Initial phase, valve value compensation stage, data write phase, mobility compensation
Stage and glow phase.
(1) initial phase
In initial phase, LED control signal VEMWith scanning signal VSCANFor high level VH, second transistor T2 and
Three transistor T3 respond LED control signal V respectivelyEMWith scanning signal VSCANAnd turn on, the voltage that data signal line provides is ginseng
Examine voltage VREF, the control pole of first node A and driving transistor T1 is initialised to by the transistor T3 and T2 of conducting with reference to electricity
Press VREF, at the same time, driving transistor T1 is in the conduction state, the first level terminal VDDThe voltage of offer is the low electricity of an initialization
Ordinary mail VDDL, the voltage of section point B is discharged to V by driving transistor T1DDL.So as to complete to first node A and the
The voltage initialization operation of two node B.
(2) in the valve value compensation stage
LED control signal VEMWith scanning signal VSCANRemain high level VH, the voltage on data signal line remains ginseng
Examine voltage VREF, therefore, the voltage of the control pole of first node A and driving transistor T1 remains VREF；First level terminal VDDIt carries
The signal of confession is by low level VDDLIt is changed into high level VDDH, therefore, VDDHSection point B is given by the driving transistor T1 of conducting
It charges until driving transistor T1 ends, at this point, the voltage of section point B is increased to VREF-VTH, wherein VTHFor driving transistor
The threshold voltage of T1, so as to extract the threshold voltage V of driving transistor T1THInformation.In other words, the valve value compensation stage
After, the threshold voltage information of driving transistor T1 is stored in storage capacitance C1 both ends.In order to obtain high contrast, at this time
VREF-VTHThe threshold voltage of light-emitting component OLED can be less than.
(3) data write phase
LED control signal VEMFor low level VL, second transistor T2 is in LED control signal VEMControl is lower in cut-off shape
State, scanning signal VSCANFor high level VH, third transistor T3 responding scanning signals VSCANHigh level and turn on, and to node A
The data-signal provided on transmission data signal line, the voltage data signal provided at this time on data signal line are data voltage
VDATA, which refreshes the voltage of first node A to V by the third transistor T3 of conductingDATA, the voltage of section point B
First node A voltage from VREFIt is charged to VDATADuring, pass through the intrinsic electricity of storage capacitance C1 and light-emitting component OLED
Hold COLEDCoupling be coupled to VB I：
Wherein, VB IFor the voltage of section point B, C1 and COLEDIt is the intrinsic of storage capacitance C1 and light-emitting component OLED respectively
The capacitance of capacitance.Therefore, the voltage difference at this time between first node A and section point B is
(4) mobility compensated stage
LED control signal VEMFor from low level VLBe converted to high level VH, second transistor T2 is converted to from cut-off state
Conducting state, scanning signal VSCANRemain high level VH, third transistor T3 is in the conduction state, is provided on data signal line
Signal voltage remain data voltage VDATA, therefore the voltage of first node A remains VDATA, the control of driving transistor T1
The voltage of pole is VDATA, so as to which driving transistor T1 is turned on, and start to charge to section point B, make the voltage lifting Δ V of B pointsB,
ΔVBIt can be expressed as：
Wherein i (t) is the electric current in driving transistor T1 turn on process.Since the time Δ t of mobility compensation is shorter,
Flowing through the electric current of driving transistor T1 can regard as constant electric current IOLED 0, the electric current is by data write phase storage capacitance two
The voltage difference decision at end, IOLED 0It can be expressed as：
Wherein, μ, COXIt is grown with mobility, unit area gate oxide capacitance and width that W/L is respectively driving transistor T1
Than.Therefore, Δ VBIt can be further represented as：
Wherein IOLED 0For as shown in formula (4), it can be seen that IOLED 0It is unrelated with the threshold voltage of driving transistor T1,
It is related with the mobility of driving transistor T1, if the mobility of driving transistor T1 is big, Δ VBIncrease, otherwise, Δ VBSubtract
It is small.C1 both ends form the reference voltage in luminescence process (i.e. between first node A and section point B), which is
Wherein, Δ VBAs shown in formula (5), which can maintain entire light period.
(5) glow phase
LED control signal VEMRemain high level VH, second transistor T2 is in the conduction state, scanning signal VSCANFor
Low level VL, third transistor T3 shut-offs are (i.e. in cut-off state) so that first node A hangs, and mobility compensated stage is formed
Reference voltage driving light-emitting component OLED start to shine, the voltage of section point B is raised to voltage V when OLED shinesOLED。
At this point, since second transistor T2 is turned on, the voltage of the control pole of driving transistor T1 is equal to the voltage of first node A, due to
First node A is hanging, and therefore, when the voltage lifting of B points, the voltage of A points also has corresponding lifting, so that first segment
Voltage difference between point A and section point B keeps the reference voltage in formula (6) constant, due to driving transistor T1 works at this time
Make in saturation region, therefore the electric current for flowing through OLED can be expressed as：
Due to Δ VBIt is unrelated with the threshold voltage of driving transistor T1, therefore, as can be seen that finally flowing through hair from (7)
The threshold voltage of the threshold voltage and OLED of the electric current of optical element OLED and driving transistor T1 in itself is all unrelated, so as to this
The pixel circuit of embodiment can compensate well for uneven caused by the variation of the threshold voltage of driving transistor T1 and OLED
Property.
On the compensation to mobility, from formula (4) and (5) it is recognised that when mobility [mu] increases, Δ VBIncrease, it is public
Quadratic term in formula (7) reduces, and compensates for the OLED current caused by mobility increases and becomes larger；Rational mobility in order to obtain
The time is compensated, is utilized | dIOLED/dμ|2<ε, ε are the amount (e.g., 0 of a certain very little<ε<0.1), can be obtained properly by solving equation
Mobility compensation the time, the mobility compensation time realized using LED control signal line and scan signal line, and
Extra control signal wire is not introduced.
By analyzing above, advantage of this embodiment is that, circuit structure is relatively easy, only with three transistors and
One storage capacitance, you can increase pixel aperture ratio, the current density of light-emitting component OLED can be reduced, shine as improving
Element OLED service lifes provide may；Pixel circuit uses rechargeable threshold value extracting mode, i.e. source follower structure, for
Positive negative threshold value has compensating action, and institute is similarly effective for the transistor of use depletion type in this way；In addition the pixel
Circuit can also compensate for uneven caused by the mobility change of driving tube.
Embodiment two：
The present embodiment and above-described embodiment one the difference is that, first is further included in pixel circuit disclosed in the present embodiment
Initialization transistor (for ease of combining diagram description, also referred to as the 4th transistor) T4, it is corresponding to be provided to section point B
Initialization voltage, and in embodiment one, the initialization voltage of section point B is by the first level terminal VDDIt provides.It refer to
Fig. 3 is a kind of image element circuit structure figure disclosed in the present embodiment.
The second electrode of 4th transistor T4 is coupled to section point B, and the first electrode of the 4th transistor T4 is used to input
Initialization voltage VR, the control pole of the 4th transistor T4 is coupled to initialization scan signal wire, for responding initialization scan letter
Number VINT.In initial phase, the 4th transistor T4 response initialization scan signals VINTAnd turn on, so as in initial phase,
The initialization current potential of the first electrode input of 4th transistor T4 is by VRIt provides, the voltage of section point B passes through the 4th transistor
T4 is initialised to initialization low-voltage VR。
In the present embodiment the drive signal waveform figure of pixel circuit as shown in figures 4 a and 4b, the pixel circuit course of work
In a frame time T (a frame cycle) five stages can be divided into：Initial phase, valve value compensation stage, data write phase, migration
Rate compensated stage and glow phase.It is illustrated by taking the present embodiment combination drive waveforms Fig. 4 a as an example.
(1) initial phase
In initial phase, LED control signal VEMWith scanning signal VSCANFor high level VH, second transistor T2 and
Three transistor T3 respond LED control signal V respectivelyEMWith scanning signal VSCANAnd turn on, the voltage that data signal line provides is ginseng
Examine voltage VREF, the control pole of first node A and driving transistor T1 is initialised to by the transistor T3 and T2 of conducting with reference to electricity
Press VREF, at the same time, initialization scan signal VINTFor high level VH, the 4th transistor T4 is in the conduction state, section point B
Voltage low-voltage V is discharged to by the 4th transistor T4R.So as to complete the voltage to first node A and section point B
Initialization.
(2) in the valve value compensation stage
LED control signal VEMWith scanning signal VSCANRemain high level VH, the electricity on data signal line Data Line
Pressure remains reference voltage VREF, therefore, the voltage of the control pole of first node A and driving transistor T1 remains VREF；Initially
Change scanning signal VINTFrom high level VHBe converted to low level VL, the 4th transistor T4 shut-offs, the first level terminal VDDPass through conducting
Driving transistor T1 charges to section point B until driving transistor is ended, at this point, the voltage of section point B is increased to VREF-
VTH, wherein VTHFor the threshold voltage of driving transistor T1.After the valve value compensation stage, the threshold voltage of driving transistor T1
Information is stored in storage capacitance C1 both ends.In order to obtain high contrast, V at this timeREF-VTHIt can be less than light-emitting component OLED's
Threshold voltage.
Other stages are similar to the respective stage of embodiment one, repeat no more.
Similar with the above process with reference to the analysis of drive waveforms Fig. 4 b using the pixel road of the present embodiment, difference is,
Initial phase first node A is B point voltage pull-downs hanging, that voltage can be initialised.
By analyzing above, in addition to it can compensate threshold voltage variation and mobility change, the present embodiment
Advantage also resides in, the first level terminal VDDIt is no longer pulse signal for constant high level power supply signal.As the first level terminal VDD
For constant voltage when, timing control is more easy to realize.
Embodiment three：
Refer to Fig. 5, be image element circuit structure figure disclosed in the present embodiment, with above-described embodiment two the difference is that,
The control pole of 4th transistor T4 is coupled to previous stage scan signal line (the i.e. scanning of lastrow pixel circuit in same scanning frame
Signal wire), the scanning signal of the 4th transistor T4 response lastrows completes the initialization to section point B.
Refer to Fig. 6, be pixel circuit shown in Fig. 5 driver' s timing figure, the driving process of the present embodiment pixel circuit with
Above-described embodiment one, embodiment two are substantially the same, the difference is that, initial phase is happened at current line (line n) scanning
Signal VSCAN[n]Before arrival, and the initialization of section point B is in the scanning signal V of lastrowSCAN[n-1]It is carried out when effectively, this
When A points are not initialized, the B point voltage pull-downs that the voltage of A points can be initialised.
A frame time T (a frame cycle) can be divided into five stages in the pixel circuit course of work shown in Fig. 5：Initialize rank
Section, valve value compensation stage, data write phase, mobility compensated stage and glow phase.Below by pixel circuit knot shown in Fig. 5
It closes drive waveforms Fig. 6 to illustrate, in fact, embodiment two combines the driving process and the substantially phase of the present embodiment of sequence diagram 4b
Together.
(1) initial phase
In initial phase, LED control signal VEMFor high level VH, second transistor T2 conductings, the scanning letter of current line
Number VSCAN[n]For low level VL, third transistor T3 shut-offs, the first scanning signal V of lastrowSCAN[n-1]For high level VH, the 4th
Transistor T4 is opened, and the voltage of section point B is discharged to low-voltage V by the 4th transistor T4R, since first node A is outstanding
Empty, therefore, the voltage of first node A is also initialised voltage pull-down to a certain low level, so as to complete to first node A
With the initialization of section point B.
(2) the valve value compensation stage
The scanning signal V of lastrowSCAN[n-1]For from high level VHBe converted to low level VL, the 4th transistor T4 shut-offs, the
Three transistor T3 respond the scanning signal V of current lineSCAN[n]It opens, LED control signal VEMRemain high level VH, therefore the
Two-transistor T2 is opened, and control pole and the first node A of driving transistor T1 be coupled, due to data signal line at this time
Voltage on Data Line is reference voltage VREF, therefore, the voltage of the control pole of first node A and driving tube is VREF；First
Level terminal VDDIt is charged to section point B by the driving transistor T1 of conducting until driving transistor is ended, at this point, section point
The voltage of B is increased to VREF-VTH, wherein VTHFor the threshold voltage of driving transistor T1.After the valve value compensation stage, driving is brilliant
The threshold voltage information of body pipe T1 is stored in storage capacitance C1 both ends.It should be noted that VREF-VTHLess than light-emitting component
The threshold voltage of OLED is to obtain high contrast.
Other stages are similar to the respective stage of embodiment one, repeat no more.
By analyzing above, in addition to it can compensate threshold voltage variation and mobility change, the present embodiment
Advantage, which also resides in, reduces a scan signal line, and the initialization of current line is completed with the scanning signal of lastrow, can be with
Increase the aperture opening ratio of pixel, reduce the complexity of peripheral circuit.
Example IV：
Fig. 7 a, Fig. 7 b and Fig. 7 c are refer to, is three kinds of image element circuit structure figures disclosed in the present embodiment, with above-described embodiment
Two the difference is that, in the present embodiment the first electrode of the 4th transistor T4 be coupled to data signal line (as shown in Figure 7a),
Either the first electrode of the 4th transistor T4 is brilliant coupled to the first electrode (as shown in Figure 7b) of second transistor T2 or the 4th
The first electrode of body pipe T4 is coupled to the second electrode (as shown in Figure 7 c) of second transistor T2, and the 4th transistor T4 responses are initial
Change control signal VRST, so as to which the initialization current potential inputted in the first electrode of the 4th transistor T4 of initial phase is believed by data
Number line provides, the initialization voltage signal V that data signal line is thus utilized to provideRIt completes to first node A's and section point B
Initialization.
Fig. 8 is refer to, for the driver' s timing figure of pixel circuit shown in the present embodiment, the driving of the present embodiment pixel circuit
Journey is substantially similar to above-described embodiment, the difference is that, in initial phase, initialization voltage signal is carried by data signal line
For the 4th transistor T4 response initialization scan signals complete the initialization to pixel circuit.
A frame time T (a frame cycle) can be divided into five stages in the pixel circuit course of work of the present embodiment：Initialization
Stage, valve value compensation stage, data write phase, mobility compensated stage and glow phase.Below by the electricity of pixel shown in Fig. 7 a
Road illustrates the concrete operations of the pixel circuit of the present embodiment with reference to drive waveforms Fig. 8, the electricity of pixel shown in Fig. 7 b and Fig. 7 c
The concrete operations on road are similar, therefore do not repeat.
(1) initial phase
Voltage signal on initial phase, data signal line is low level signal VR.LED control signal VEM, scanning
Signal VSCANWith initialization control signal VRSTIt is high level VH, therefore, second transistor T2, third transistor T3 and the 4th crystalline substance
Body pipe T4 is turned on, and therefore, the voltage of first node A and section point B are all initialized to low level signal VR, so as to complete
Initialization to first node A and section point B.
(2) in the valve value compensation stage
Initialization scan signal is from high level VHBe converted to low level VL, the 4th transistor T4 shut-offs, scanning signal VSCANWith
LED control signal VEMRemain high level VHSo that second transistor T2 and third transistor T3 are held on, driving transistor
The control pole of T1 is coupled with first node A, since the voltage on data signal line at this time is reference voltage VREF, therefore,
The voltage of the control pole of first node A and driving transistor T1 is VREF；First level terminal VDDPass through the driving transistor T1 of conducting
It is charged to section point B until driving transistor T1 ends, at this point, the voltage of section point B is increased to VREF-VTH, wherein VTH
For the threshold voltage of driving transistor T1.After the valve value compensation stage, the threshold voltage information of driving transistor T1 is stored
At storage capacitance C1 both ends.To obtain high contrast, VREF-VTHThe threshold voltage of light-emitting component OLED can be less than.
Other stages are similar to the respective stage of embodiment one, repeat no more.
By analyzing above, in addition to it can compensate threshold voltage variation and mobility change, the present embodiment
Advantage also resides in, and the initialization voltage signal provided by using data signal line can make panel reduce by a low level electricity
Pressure.
Embodiment five：
Refer to Fig. 9, be image element circuit structure figure disclosed in the present embodiment, with the various embodiments described above the difference is that,
The control pole of 4th transistor T4 is coupled to the second electrode of the 4th transistor T4；The first electrode of 4th transistor T4 is coupled to
Initialization control signal VRET, the voltage of section point B discharged by the 4th transistor T4 of diode-connected, completed to second
The initialization of node B.After completing initialization, initialization control signal keeps high level that the 4th transistor T4 is turned off, no
The work of circuit is influenced again.
Please refer to Fig.1 0, be circuit shown in Fig. 9 driving process sequence diagram, the driving process of the present embodiment pixel circuit with
The driving process of embodiment two is substantially similar, the difference is that, the initialization voltage provider of initial phase section point B
The closing mode of the 4th transistor T4 of formula and valve value compensation stage.With reference to the electricity of pixel shown in driver' s timing Figure 10 a and Fig. 9
The course of work of pixel circuit is described in road.A frame time T (a frame cycle) can be divided into the pixel circuit course of work
Five stages：Initial phase, valve value compensation stage, data write phase, mobility compensated stage and glow phase.
(1) initial phase
The scanning signal V of current lineSCAN[n]With LED control signal VEMFor high level VH, therefore, second transistor T2 and
Third transistor T3 is turned on, and the control pole of first node A and driving tube T1 are by the voltage V on data signal lineREFIt is initialised to
VREF；Initialization pulse voltage signal VRETFor low level, the voltage of section point B is put by the 4th transistor T4 of diode-connected
Electricity completes the initialization to section point B to low level, so as to complete the initialization to first node A and section point B.
(2) in the valve value compensation stage
Initialization pulse voltage signal VRETIt is high level from low transition, then the 4th transistor T4 is turned off, the 3rd crystal
The scanning signal V of pipe T3 and second transistor T2 response current linesSCANWith LED control signal VEMHigh level VHAnd open, by
It is coupled in the control pole of driving transistor T1 with first node A, the voltage on data signal line is reference voltage at this time
VREF, therefore, the voltage of the control pole of first node A and driving tube is VREF；First level terminal VDDPass through the driving crystal of conducting
Pipe T1 charges to section point B until driving transistor T1 ends, at this point, the voltage of section point B is increased to VREF-VTH, wherein
VTHFor the threshold voltage of driving transistor T1.After the valve value compensation stage, the threshold voltage information of driving transistor T1 is deposited
Storage is at storage capacitance C1 both ends.To obtain high contrast, VREF-VTHThe threshold voltage of light-emitting component OLED can be less than.
Other stages are similar to the respective stage of embodiment one, repeat no more.
In another specific embodiment, shown in driver' s timing such as Figure 10 (b).T3 pipes are held off during initialization, at this time
T4 is turned on, and B points are initialized to a certain low level, then A points are also initialized to low level, completes V after initializationRETFor height
Level, the shut-off of T4 pipes, circuit initially enter the threshold value extraction stage；Stage, third transistor T3 and the second crystal are extracted in threshold value
Pipe T2 responds the scanning signal V of current lineSCANWith LED control signal VEMHigh level VHAnd open, due to driving transistor T1
Control pole be coupled with first node A, at this time the voltage on data signal line be reference voltage VREF, therefore, first segment
The voltage of the control pole of point A and driving tube is VREF；First level terminal VDDBy the driving transistor T1 of conducting to section point B
It charges until driving transistor T1 ends, at this point, the voltage of section point B is increased to VREF-VTH, wherein VTHFor driving transistor
The threshold voltage of T1.After the valve value compensation stage, the threshold voltage information of driving transistor T1 is stored in storage capacitance C1
Both ends.To obtain high contrast, VREF-VTHThe threshold voltage of light-emitting component OLED can be less than.Other stages and embodiment one
Respective stage is similar, repeats no more.
By analyzing above, in addition to it can compensate threshold voltage variation and mobility change, the present embodiment
Advantage, which also resides in, has lacked a power cord, and then can reduce process complexity, and simplifies structure.
Embodiment six：
1 is please referred to Fig.1, is a kind of image element circuit structure figure disclosed in the present embodiment, with the various embodiments described above difference
It is, the second initialization transistor is further included in pixel circuit disclosed in the present embodiment and (for ease of combining diagram description, is also referred to as it
For the 5th transistor) T5, it acts as provide reference voltage V in the threshold value extraction stage for pixel circuitREF.Needed for first node A
Reference voltage VREFAnd/or initialization voltage is transmitted by the 5th transistor T5, data signal line only provides data-signal VDATA,
Thus simplify the timing control of data cable, by reasonably designing the row time of pixel circuit can be reduced, further easily
Meet high-resolution and the display demand of high frame frequency.Above-described embodiment one to five can make suitable on its image element circuit structure
When modification, to design the respective pixel circuit for including the 5th transistor T5, for example, pixel circuit shown in Figure 11 is in reality
Apply particular circuit configurations obtained from increasing by the 5th transistor T5 on the basis of the pixel circuit of example three, other embodiments can also be by
Similar fashion designs to obtain.
In order to reduce the control signal of pixel circuit, the scanning signal of several rows above can be made full use of to carry out pixel
The initialization of circuit and threshold value extraction process, if the often capable row time is set to be equal to the time that threshold value is extracted, current line pixel
For line n, then the control pole of the 4th transistor is coupled to the scanning signal of the n-th -2 row, the control pole of the 5th transistor T5
Coupled to the scanning signal of the (n-1)th row.
Specifically, the pixel circuit of the present embodiment and the difference of the pixel circuit in embodiment three include：Pixel electricity
Road further includes the 5th transistor T5, and the control pole of the 5th transistor T5 is coupled to the scanning signal V of the (n-1)th rowSCAN[n-1], the 5th
The first electrode of transistor T5 is coupled to reference voltage source signal VREF, the second electrode of the 5th transistor T5 is coupled to first segment
Point A；The control pole of 4th transistor T4 is coupled to the scanning signal V of the n-th -2 rowSCAN[n-2]。
A frame time T (a frame cycle) can be divided into five stages in the pixel circuit course of work shown in Figure 11：Initialize rank
Section, valve value compensation stage, data write phase, mobility compensated stage and glow phase.With reference to drive waveforms Figure 12 for this
The embodiment place different from embodiment three illustrates.
(1) initial phase
In initial phase, LED control signal VEMFor high level VH, second transistor T2 conductings, the scanning letter of current line
Number VSCAN[n]With the scanning signal V of the (n-1)th rowSCAN[n-1]For low level VL, the shut-off of third transistor T3 and T5 transistor, n-th -2
Capable scanning signal VSCAN[n-2]For high level VH, the 4th transistor T4 opens, and the voltage of section point B passes through the 4th transistor
T4 is discharged to low-voltage VR, due to first node A be it is hanging, the voltage of first node A is also initialised voltage pull-down
To a certain low level, so as to complete the initialization to first node A and section point B.
(2) in the valve value compensation stage
The scanning signal V of n-th -2 rowSCAN[n-2]From high level VHBe converted to low level VL, the 4th transistor T4 shut-offs, currently
Capable scanning signal VSCAN[n]For low level VL, third transistor T3 shut-offs, the scanning letter of the 5th transistor T5 the (n-1)th rows of response
Number VSCAN[n-1]Conducting, LED control signal VEMRemain high level VH, second transistor T2 conductings, the control of driving transistor T1
Pole processed is coupled with first node A, and therefore, the voltage of the control pole of first node A and driving transistor T1 is VREF；The
One level terminal VDDIt is charged to section point B by the driving transistor T1 of conducting until driving transistor T1 ends, at this point, second
The voltage of node B is increased to VREF-VTH, wherein VTHFor the threshold voltage of driving transistor T1.After the valve value compensation stage, drive
The threshold voltage information of dynamic transistor T1 is stored in storage capacitance C1 both ends.To obtain high contrast, VREF-VTHIt can be less than
The threshold voltage of light-emitting component OLED.
(3) data write phase
LED control signal VEMFor low level VL, second transistor T2 shut-offs, the scanning signal V of the (n-1)th rowSCAN[n-1]With
The scanning signal V of n-th -2 rowSCAN[n-2]It is low level VL, the 4th transistor T4 and the 5th transistor T5 are turned off；Current line
Scanning signal VSCAN[n]For high level VH, third transistor T3 is in the conduction state, and the signal voltage provided on data signal line is
Data voltage VDATA, which refreshes the voltage of first node A to V by the third transistor T3 of conductingDATA, the second section
The voltage of point B first node A voltage from VREFIt is charged to VDATADuring, pass through storage capacitance C1 and light-emitting component
The intrinsic capacity C of OLEDOLEDCoupling be coupled to VB I：
Wherein, VB IFor the voltage of section point B, C1 and COLEDIt is the intrinsic of storage capacitance C1 and light-emitting component OLED respectively
The capacitance of capacitance.Therefore, the voltage difference at this time between first node A and section point B is
Other stages are similar to the respective stage of embodiment one, repeat no more.
By analyzing above, in addition to it can compensate threshold voltage variation and mobility change, though the present embodiment
So mostly transistor, but it takes full advantage of the scan signal line that front is gone, and reduces the row time so that and circuit is relatively more
Large area high-resolution is suitble to show.
Embodiment seven：
3 are please referred to Fig.1, is a kind of image element circuit structure figure disclosed in the present embodiment, with six difference of above-described embodiment
It is, the control pole of the 5th transistor T5 in pixel circuit disclosed in the present embodiment is coupled to scan control signal line, and the 4th
The control pole of transistor T4 is coupled to the scan signal line of front a line.With the raising of display panel frequency and resolution ratio,
Often the capable row time is shorter and shorter, and the row time is not enough to provide time enough to carry out threshold value extraction, because if threshold value carries
The time taken is shorter, and the precision of compensation will substantially reduce, it is desirable to threshold value extraction time it is long and do not increase
The row time can meet high-resolution and the display demand of high frame frequency using the present embodiment.
Assuming that the time of threshold value extraction is a times of the row time, a is integer, then the control pole of the 4th transistor is coupled to the
The scanning signal of n- (a+1) rows.The present embodiment is 3 times of the row time using threshold value extraction time and sets (it is to be understood that the multiple is unlimited
Can be the multiple of other numerical value in 3), then the control pole of the 4th transistor T4 is coupled to the scanning signal of the n-th -4 row, the
The control pole of five transistors is coupled to scan control signal VSC.In order to improve the precision of threshold value extraction, threshold value extraction can be increased
Time.
Figure 14 be the present embodiment pixel circuit drive waveforms figure, with reference to drive waveforms Figure 14 to the present embodiment with
The different place of embodiment six illustrates.A frame time T (a frame cycle) can divide in the pixel circuit course of work shown in Figure 13
For five stages：Initial phase, valve value compensation stage, data write phase, mobility compensated stage and glow phase.
(1) initial phase
In initial phase, LED control signal VEMFor high level VH, second transistor T2 conductings, the scanning letter of current line
Number VSCAN[n]With scan control signal VSCIt is low level VL, the shut-off of third transistor T3 and T5 transistor, the scanning of the n-th -4 row
Signal VSCAN[n-4]For high level VH, the 4th transistor T4 conductings, the voltage of section point B is discharged to by the 4th transistor T4
Low-voltage VR, due to first node A be it is hanging, the voltage of first node A is also initialised voltage pull-down to a certain low
Level, so as to complete the initialization to first node A and section point B.
(2) in the valve value compensation stage
The scan control signal V of n-th -4 rowSCAN[n-4]From high level VHBe converted to low level VL, the 4th transistor T4 shut-offs,
First scan control signal V of current lineSCAN[n]For low level VL, third transistor T3 shut-offs, the 5th transistor T5 responses are currently
Capable scan control signal VSCHigh level conducting, LED control signal VEMRemain high level VH, second transistor T2 openings,
The control pole of driving transistor T1 is coupled with first node A, therefore, the electricity of the control pole of first node A and driving tube
It presses as VREF；First level terminal VDDIt is charged to section point B by the driving transistor T1 of conducting until driving transistor T1 is cut
Only, at this point, the voltage of section point B is increased to VREF-VTH, wherein VTHFor the threshold voltage of driving transistor T1.Valve value compensation
After stage, the threshold voltage information of driving transistor T1 is stored in storage capacitance C1 both ends.To obtain high contrast,
VREF-VTHThe threshold voltage of light-emitting component OLED can be less than.
(3) data write phase
LED control signal VEMFor low level VL, second transistor T2 shut-offs, the scanning signal V of the n-th -4 rowSCAN[n-4]For
Low level VL, the 4th transistor T4 shut-offs；The scan control signal V of current lineSCFor low level VL, the 5th transistor T5 shut-offs；
The scanning signal V of current lineSCAN[n]For high level VH, third transistor T3 is in the conduction state, the letter provided on data signal line
Number voltage is data voltage VDATA, the voltage for the third transistor T3 refreshing first nodes A which passes through conducting is extremely
VDATA, the voltage of section point B first node A voltage from VREFIt is charged to VDATADuring, by storage capacitance C1 and
The intrinsic capacity C of light-emitting component OLEDOLEDCoupling be coupled to VB I：
Wherein, VB IFor the voltage of section point B, C1 and COLEDIt is the intrinsic of storage capacitance C1 and light-emitting component OLED respectively
The capacitance of capacitance.Therefore, the voltage difference at this time between first node A and section point B is
Other stages are similar to the respective stage of embodiment one, repeat no more.
By analyzing above, in addition to it can compensate threshold voltage variation and mobility change, though the present embodiment
So mostly control signal wire, but the row time further shorten to the time of data write-in and mobility compensation so that circuit
It is more suitable for large area high-resolution relatively to show.
Various embodiments above can also complete electricity in the form of shining or being grouped driving simultaneously according to specific circumstances
The driving operation on road, using shine simultaneously and grouping driving during entire panel or threshold value with the pixel circuit of group carry
It takes and is carried out at the same time, can so shorten often the effective of row and become the time, with being suitble to large area and high-resolution display
Demand.
In addition, above example be applied to the embodiment of the present application display device when, in one embodiment, scan line to
The scanning signal that respective pixel circuit provides can be such as initialization control signal VRST, scanning signal VSCAN, light emitting control letter
Number VEMDeng.In other embodiments, some scanning signals needed for pixel circuit can also pass through global lines (such as shown in Figure 15)
Mode provide, such as power cord, initialization control signal V needed for the first level terminalINTRequired initialization control line VR
Deng those skilled in the art can be adjusted according to the demand of specific pixel circuit.
Based on pixel circuit disclosed in above-described embodiment, one embodiment of the application also discloses a kind of display circuit driving side
Method, the display circuit use the pixel circuit of above-described embodiment, and wherein each drive cycle of pixel circuit includes initialization rank
Section, valve value compensation stage, data write phase, mobility compensated stage and glow phase, driving method include：
In initial phase, second transistor T2 conductings and third transistor T3 conductings initialize storage capacitance C1 respectively
The voltage at both ends and the voltage of driving transistor T1 control poles.In other embodiments, the 4th crystal of conducting can also be passed through
The voltage at pipe T4 and the 5th transistor T5 auxiliary initialization storage capacitance C1 both ends.
In the valve value compensation stage, third transistor T3 and/or the 5th transistor T5 conductings, to driving transistor T1 control poles
Reference voltage is provided, the threshold voltage information of driving transistor T1 is read and passes through storage capacitance C1 and store.In a kind of embodiment
In, reference voltage can be provided by third transistor T3；In another embodiment, it can also be carried by the 5th transistor T5
Supply reference voltage.
In data write phase, third transistor T3 conducting transmission data voltages VDATA, by the storage capacitance of series connection and
The partial pressure of the intrinsic capacity of luminescent device is by data voltage VDATAWith threshold voltage VTHIt is stored in storage capacitance C1 both ends.
In mobility compensated stage, third transistor T3 conductings make the voltage of first node A remain data voltage VDATA,
Second transistor T2 conductings turn on driving tube to charge to B points, and the knots modifications of B point voltages is only related with the mobility of driving tube,
It is unrelated with threshold voltage, by the way that ON time is reasonably controlled to complete the compensation of mobility.
In glow phase, driving transistor T1 generates driving current according to the pressure differential at storage capacitance C1 both ends, and drives
Dynamic light-emitting component OLED shines.
The threshold voltage that the form that pixel circuit provided by the embodiments of the present application is followed by source generates driving transistor is believed
Breath generates the threshold voltage of the driving transistor electricity related with half-tone information by the form that charge divides at storage capacitance both ends
Pressing information, other states of holding circuit are constant after completion data write-in opens in advance with the threshold voltage of compensation for drive transistor
Change Δ V is ultimately formed the reference voltage in luminescence process by light emitting control pipe, the information at storage capacitance both ends.Wherein, Δ V with
Threshold voltage is unrelated, only with the mobility of driving transistor in relation to the mobility change so as to compensation.In luminescence process, the benchmark
Voltage remains unchanged so that and it is unrelated with the threshold voltage of driving transistor and light-emitting component to flow through the driving current of luminescent device,
And influence of the mobility change for improving driving tube to pixel circuit brightness uniformity is overlapped using control signal, is solved aobvious
Show panel due to showing problem of non-uniform caused by threshold voltage and mobility change.
The specific each example of use above is illustrated the application, is only intended to help to understand the application, not limiting
The application processed.Transistor still, according to the thought of the application, and is not departing from this Shen using N-type TFT in specific embodiment
Please in the range of, other can also be designed with reference to p-type or N, the pixel circuit of p-type TFT.Moreover, for belonging to the application
Those skilled in the art without departing from the inventive concept of the premise, can also make several simple deductions, deform or replace
It changes.
Claims (8)
1. a kind of pixel circuit, which is characterized in that including driving transistor, light-emitting component, drive control transistor, data write-in
Transistor and storage capacitance, wherein,
The driving transistor connects the light-emitting component, for the light-emitting component to be driven to shine；
The data writing transistor connects data signal line, signal scanning line, the drive control transistor and described respectively
Storage capacitance, for when the scanning signal of the scan signal line is effective, responding the data-signal of the data signal line
To provide the voltage of the data-signal；
The drive control transistor connects LED control signal line, the driving transistor and data write-in crystal respectively
Pipe for responding the LED control signal, completes the compensation of threshold value and mobility and by the data writing transistor
The voltage of the data-signal provided writes the driving transistor；
The storage capacitance is also connected with the light-emitting component, for being provided when carrying out valve value compensation for the drive control transistor
The threshold voltage of the driving transistor；
Wherein, each drive cycle of the pixel circuit include initial phase, the valve value compensation stage, data write phase,
Mobility compensated stage and glow phase；
In the initial phase, the drive control transistor is turned on, initializes the storage capacitance and the luminous member
The voltage of one end of the connection driving transistor of part；
In the valve value compensation stage, the drive control transistor is held on, to provide ginseng for the driving transistor
Voltage is examined, is charged to the driving transistor until the driving transistor turns off, the threshold value for extracting the driving transistor is electric
It presses and is stored in the storage capacitance；
In the data write phase, the drive control transistor is turned off, turns on the data writing transistor so that
The voltage of one end of the connection driving transistor of the light-emitting component is refreshed, and the storage capacitance stores the data and writes
Enter the voltage difference between the voltage of one end of the connection driving transistor of the voltage and the light-emitting component of transistor output；
In the mobility compensated stage, the data writing transistor is held on, and turns on the drive control transistor,
The driving transistor conducting, the voltage of one end of the connection driving transistor of the light-emitting component is through the driving crystal
Pipe lifting so that the both ends of the storage capacitance form the reference voltage of luminescence process；
In the glow phase, turn off the data writing transistor, the drive control transistor is held on, described to move
The reference voltage that shifting rate compensated stage is formed drives the light-emitting component to shine；
The mobility compensation time of wherein described mobility compensated stage is to utilize the LED control signal line and the signal
Scan line is realized, by solving equation | dIOLED/dμ|2<ε and obtain, IOLEDTo flow through the electric current of the driving transistor, μ is
The mobility of the driving transistor, 0<ε<0.1.
2. pixel circuit as described in claim 1, which is characterized in that the first initialization transistor is further included, at the beginning of described first
Beginningization transistor connects the light-emitting component, for being provided just to one end of the connection driving transistor of the light-emitting component
Beginningization voltage.
3. pixel circuit as claimed in claim 2, which is characterized in that the second initialization transistor is further included, at the beginning of described second
Beginningization transistor connects the drive control transistor, for being carried by the drive control transistor for the driving transistor
For required reference voltage or initialization voltage.
4. pixel circuit as claimed in claim 3, which is characterized in that
The control pole of the driving transistor connects the second electrode of the drive control transistor, and the of the driving transistor
One electrode connects the first level terminal, and the second electrode of the driving transistor connects the first end of the light-emitting component, the hair
The second end connection second electrical level end of optical element；
The control pole connection LED control signal line of the drive control transistor, the first electrode of the drive control transistor
Connect the second electrode of the data writing transistor；
The control pole of the data writing transistor connects the scan signal line, the first electrode of the data writing transistor
Connect the data signal line；
The first electrode end of the storage capacitance connects the second electrode of the data writing transistor, and the of the storage capacitance
Two electrode tips connect the first end of the light-emitting component.
5. pixel circuit as claimed in claim 4, which is characterized in that
The control pole connection initialization control signal of first initialization transistor, the first of first initialization transistor
Electrode connect the initialization voltage either the first electrode of the data signal line or the drive control transistor or
The control pole of the second electrode of drive control transistor or first initialization transistor, first initialization transistor
Second electrode connect the first end of the light-emitting component；
Alternatively, the control pole of first initialization transistor connects sweeping for preceding n- (a+1) rows that the pixel circuit is expert at
Signal wire, the line number that n is expert at by the pixel circuit are retouched, a is the integral multiple of time used in scanning a line, and described first is initial
The first electrode for changing transistor connects the initialization voltage, and the second electrode of first initialization transistor connects the hair
The first end of optical element.
6. pixel circuit as claimed in claim 5, which is characterized in that
The control pole of second initialization transistor connect the previous row that the pixel circuit is expert at scan signal line or
Person's scan control signal, the first electrode connection reference voltage of second initialization transistor, second initial crystalline
The second electrode connection initialization voltage of pipe.
7. a kind of driving method of pixel circuit, applied to the pixel electricity as described in any one of claim 1 to 6 claim
Road, which is characterized in that each drive cycle of the pixel circuit includes initial phase, valve value compensation stage, data write-in
Stage, mobility compensated stage and glow phase, the driving method include：
In the initial phase, the drive control transistor is turned on, initializes the storage capacitance and the luminous member
The voltage of one end of the connection driving transistor of part；
In the valve value compensation stage, the drive control transistor is held on, to provide ginseng for the driving transistor
Voltage is examined, is charged to the driving transistor until the driving transistor turns off, the threshold value for extracting the driving transistor is electric
It presses and is stored in the storage capacitance；
In the data write phase, the drive control transistor is turned off, turns on the data writing transistor so that
The voltage of one end of the connection driving transistor of the light-emitting component is refreshed, and the storage capacitance stores the data and writes
Enter the voltage difference between the voltage of one end of the connection driving transistor of the voltage and the light-emitting component of transistor output；
In the mobility compensated stage, the data writing transistor is held on, and turns on the drive control transistor,
The driving transistor conducting, the voltage of one end of the connection driving transistor of the light-emitting component is through the driving crystal
Pipe lifting so that the both ends of the storage capacitance form the reference voltage of luminescence process；
In the glow phase, turn off the data writing transistor, the drive control transistor is held on, described to move
The reference voltage that shifting rate compensated stage is formed drives the light-emitting component to shine；
The mobility compensation time of wherein described mobility compensated stage is to utilize the LED control signal line and the signal
Scan line is realized, by solving equation | dIOLED/dμ|2<ε and obtain, IOLEDTo flow through the electric current of the driving transistor, μ is
The mobility of the driving transistor, 0<ε<0.1.
8. a kind of display device, which is characterized in that including：
Pixel circuit matrix, the pixel circuit matrix include be arranged in N row M column matrix such as any one of claim 1-6 institutes
The pixel circuit stated, N and M are positive integer；
Gate driving circuit, for generating scanning signal, and passing through each line scan signals line formed along the first direction to described
Pixel circuit provides required control signal；
Data drive circuit for generating the data-signal for representing half-tone information, and passes through each data formed in a second direction
Signal wire provides data-signal to the pixel circuit；
Controller, for providing control sequential to the gate driving circuit and the data drive circuit respectively.
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| CN106856086B (en) * | 2017-01-23 | 2019-03-19 | 京东方科技集团股份有限公司 | A kind of electric compensation method and display panel |
| CN106652917A (en) * | 2017-03-15 | 2017-05-10 | 四川太锦信息技术有限公司 | Circuit of organic electroluminescence element established on same voltage |
| CN106935202B (en) * | 2017-05-19 | 2019-01-18 | 京东方科技集团股份有限公司 | Pixel circuit and its driving method, display device |
| CN108538249B (en) * | 2018-06-22 | 2021-05-07 | 京东方科技集团股份有限公司 | Pixel driving circuit and method and display device |
| CN109064975B (en) * | 2018-09-28 | 2020-04-03 | 昆山国显光电有限公司 | Pixel circuit, driving method thereof, display panel and display device |
| CN109727578A (en) | 2018-12-14 | 2019-05-07 | 合肥鑫晟光电科技有限公司 | Compensation method, device and the display equipment of display device |
| CN111402803B (en) * | 2020-04-23 | 2022-08-12 | 湖南鹰神新材料科技有限公司 | Micro-display array circuit, display method and active luminous display thereof |
| CN113963667B (en) * | 2020-07-21 | 2023-04-18 | 京东方科技集团股份有限公司 | Display device and driving method thereof |
| CN112511769B (en) * | 2020-11-05 | 2022-09-20 | 北京大学深圳研究生院 | Image sensor pixel circuit and image sensing array |
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