CN109256088A - Pixel circuit, display panel, display device and image element driving method - Google Patents
Pixel circuit, display panel, display device and image element driving method Download PDFInfo
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- CN109256088A CN109256088A CN201811288354.5A CN201811288354A CN109256088A CN 109256088 A CN109256088 A CN 109256088A CN 201811288354 A CN201811288354 A CN 201811288354A CN 109256088 A CN109256088 A CN 109256088A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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Abstract
The invention discloses a kind of pixel circuit, display panel, display device and image element driving methods, the pixel circuit includes: driving transistor, luminescent device, resetting sub-circuit, threshold voltage compensation sub-circuit and current density compensation sub-circuit, wherein resetting sub-circuit is for the first operating voltage provided by the first power end to be written to first node in reset phase；Threshold voltage compensation sub-circuit is for first node to be connected with third node at the threshold compensation stage, and data voltage provided by data line is written to second node, so that the voltage at first node charges to the first offset voltage, and the second operating voltage provided by second source end is written to second node at the stage of display；Current density compensation sub-circuit is for being promoted to the second offset voltage for the first offset voltage at first node at the stage of display.Technical solution of the present invention not only can carry out threshold compensation to driving transistor, can also promote the service life of luminescent device.
Description
Technical field
The present invention relates to field of display technology, in particular to a kind of pixel circuit, display panel, display device and pixel are driven
Dynamic method.
Background technique
It is that the electric current generated by driving transistor in saturation state is driven that organic LED panel, which can shine,
Because when inputting identical gray scale voltage, different threshold voltages can generate different driving currents, the inconsistent of electric current is caused
Property.
Traditional 2T1C pixel circuit brightness uniformity is very poor always, to solve this problem, solution relatively good at present
Method is exactly that compensation circuit is added in pixel, eliminates the threshold voltage of driving transistor to driving current by compensation circuit
It influences.
However, finding in practical applications, it is the pixel circuit of P-type transistor for driving transistor, is using compensation
When circuit is to eliminate influence of the threshold voltage of driving transistor to driving current, the elimination meeting of threshold voltage is so that driving crystal
The driving current that pipe is exported increases, and the current density of the organic luminous layer in luminescent device necessarily increases at this time, this is easy to lead
Cause the aging of light emitting layer material, the service life decline of entire oled panel.
Summary of the invention
The present invention is directed at least solve one of the technical problems existing in the prior art, a kind of pixel circuit, aobvious is proposed
Show panel, display device and image element driving method.
To achieve the above object, the present invention provides a kind of pixel circuits, comprising: driving transistor, luminescent device, resetting
Sub-circuit, threshold voltage compensation sub-circuit and current density compensate sub-circuit；
The control electrode of the driving transistor, the first pole of the driving transistor, second pole for driving transistor,
First node, second node and third node are connected to the threshold voltage compensation sub-circuit respectively；
The resetting sub-circuit is connect with first control signal line, the first power end, the first node, for resetting
In response to the control of first control signal provided by the first control signal line when stage, first power end is mentioned
The first operating voltage supplied is written to the first node；
The threshold voltage compensation sub-circuit is also connect with grid line, second control signal line, data line, second source end,
For the control at the threshold compensation stage in response to scanning signal provided by the grid line, by the first node with it is described
The conducting of third node, and data voltage provided by the data line is written to the second node, so that described first
Voltage at node charges to the first offset voltage；And it is mentioned at the stage of display in response to the second control signal line
Second operating voltage provided by the second source end is written to second section for the control of the second control signal of confession
Point；
Current density compensation sub-circuit and the second control signal line, the third control signal wire, described the
The first pole connection of one power end, the luminescent device, is used at the display stage in response to the second control signal
The control of second control signal provided by line, the control signal of third provided by the third control signal wire, by described the
First offset voltage at one node is promoted to the second offset voltage, wherein V2=V1+ △ V, V1 indicate that described first mends
Voltage is repaid, V2 indicates second offset voltage, and △ V is expressed as the current density reduced at the luminescent device and presets
Offset voltage；
First pole of the luminescent device is connect with the third node, the second pole of the luminescent device and third power supply
End connection；
The driving transistor is used at the display stage in response to the control of second offset voltage, to described
Luminescent device output driving current, to drive the luminescent device to be shown.
Optionally, the threshold voltage compensation sub-circuit include: first switch tube, second switch, third switching tube and；
The control electrode of the first switch tube is connect with the grid line, the first pole of the first switch tube and described second
Node connection, the second pole and the data line of the first switch tube connect；
The control electrode of the second switch is connect with the grid line, the first pole of the second switch and described first
Node connection, the second pole of the second switch is connect with the third node；
The control electrode of the third switching tube is connect with the second control signal line, the first pole of the third switching tube
It is connect with the second source end, the second pole of the third switching tube is connect with the second node；
The first end of the first capacitor is connect with the second source end, the second end of the first capacitor and described the
The connection of one node.
Optionally, the current density compensation sub-circuit includes: the 4th switching tube, the 5th switching tube and the second capacitor；
The control electrode of 4th switching tube is connect with the second control signal line, the first pole of the 4th switching tube
It is connect with the second source end, the second pole of the 4th switching tube is connect with the second end of second capacitor；
The control electrode of 5th switching tube is connect with the third control signal wire, the first pole of the 5th switching tube
It is connect with the second end of second capacitor, the second pole of the 5th switching tube is connect with the first pole of the luminescent device；
The first end of second capacitor is connect with the first node.
Optionally, one of the 4th switching tube and the 5th switching tube are N type switch tube, and another one is p-type
Switching tube；
The second control signal line and the third control signal wire are same control signal wire.
Optionally, the resetting sub-circuit includes: the 6th switching tube；
The control electrode of 6th switching tube is connect with the first control signal line, the first pole of the 6th switching tube
It is connect with first power end, the second pole of the 6th switching tube is connect with the first node.
Optionally, further includes: the first pole of light emitting control sub-circuit, the luminescent device passes through the light emitting control electricity
Road is connect with the third node；
The light emitting control sub-circuit is connect with the third control signal wire, at the display stage in response to
The control of the third control signal, the first pole of the luminescent device is connected with the third node.
Optionally, the light emitting control sub-circuit includes: the 7th switching tube；
The control electrode of 7th switching tube is connect with the second control signal line, the first pole of the 7th switching tube
It is connect with the third node, the second pole of the 7th switching tube is connect with the first pole of the luminescent device.
To achieve the above object, the present invention also provides a kind of display panels, comprising: such as above-mentioned pixel circuit.
Optionally, the display panel further include: several grid lines and several data lines, whole grid lines and whole
The data line limits several pixel units, the corresponding grid line of pixel circuit described in every row；
In addition to the pixel circuit for being located at the first row, in the pixel circuit for being located at other rows, the company of pixel circuit institute
The first control signal line connect is a grid line corresponding to the pixel circuit positioned at its own previous row.
To achieve the above object, the present invention also provides a kind of display devices, comprising: such as above-mentioned display panel.
To achieve the above object, the present invention also provides a kind of image element driving method, the image element driving method is based on upper
The pixel circuit stated, the image element driving method include:
In the reset phase, the sub-circuit that resets is in response to the control of the first control signal, by described first
Operating voltage is written to the first node；
In the threshold compensation stage, the threshold voltage compensation sub-circuit, will be described in response to the control of the scanning signal
First offset voltage is written to the first node；
In the display stage, the current density compensation sub-circuit is in response to the second control signal and the third
The control for controlling signal, is promoted to the second offset voltage, the threshold value for first offset voltage at the first node
Second operating voltage is written to second node in response to the control of the second control signal for voltage compensation sub-circuit,
The control that transistor is driven in response to second offset voltage, to the luminescent device output driving current, with driving
The luminescent device is shown.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of pixel circuit involved in the prior art；
Fig. 2 is a kind of circuit diagram for pixel circuit that the embodiment of the present invention one provides；
Fig. 3 is a kind of circuit diagram of pixel circuit provided by Embodiment 2 of the present invention；
Fig. 4 is the working timing figure of pixel circuit shown in Fig. 3；
Fig. 5 is a kind of circuit diagram for pixel circuit that the embodiment of the present invention three provides；
Fig. 6 is a kind of flow chart for image element driving method that the embodiment of the present invention four provides；
It is located at line n in the display panel that Fig. 7 provides for the embodiment of the present invention five, the circuit for the pixel unit that m is arranged shows
It is intended to.
Specific embodiment
To make those skilled in the art more fully understand technical solution of the present invention, the present invention is mentioned with reference to the accompanying drawing
A kind of pixel circuit, display panel, display device and the image element driving method supplied is described in detail.
To make those skilled in the art more fully understand technical solution of the present invention, the present invention is mentioned with reference to the accompanying drawing
A kind of pixel circuit, display device and the image element driving method supplied is described in detail.
Luminescent device in the present invention can be in the prior art include LED (Light Emitting Diode, shine two
Pole pipe) or OLED (Organic Light Emitting Diode, Organic Light Emitting Diode) including current drive-type shine
Device is the explanation carried out so that luminescent device is OLED as an example in the present embodiment.
Fig. 1 is a kind of circuit diagram of pixel circuit involved in the prior art, as shown in Figure 1, as shown in Figure 1, existing
The pixel-driving circuit of some bases uses 2T1C circuit, which includes two thin film transistor (TFT)s (switch transistor T 0 and driving
Transistor DTFT) and 1 storage capacitance C.
But due in existing low temperature polysilicon process processing procedure, on display base plate each driving transistor DTFT it
Between threshold voltage vt h uniformity it is poor, and in use it also occur that drift, in this way when scan line Scan (also known as
For grid line) control switch pipe T0 conducting with to driving transistor DTFT input identical data voltage Vdata when, due to drive crystal
The threshold voltage difference of pipe DTFT generates different driving currents, and the uniformity so as to cause luminescent device OLED brightness is poor.
With continued reference to shown in Fig. 1, at the stage of display, the control pole tension of driving transistor DTFT is Vdata, according to drive
The saturation drive current formula of dynamic transistor DTFT can obtain:
I1=K* (Vgs-Vth)2
=K* (Vdata-Vdd-Vth)2
=K* (Vdd+Vth-Vdata)2
Wherein, I1 is the driving current for driving transistor DTFT output, and K is a constant, and Vgs is driving transistor DTFT
Gate source voltage；Data voltage Vdata is less than Vdd；When driving transistor DTFT is P-type transistor, threshold voltage vt h is
Negative value, and Vdd+Vth-Vdata is greater than 0.
In the prior art by adding compensation circuit to eliminate the threshold voltage of driving transistor DTFT to driving current
The principle of influence is as follows, then will at the stage of display by obtaining the threshold voltage of driving transistor DTFT in compensated stage
Driving the voltage control at the control electrode of transistor DTFT is Vdata+Vth, is driven at this time according to the saturation of driving transistor DTFT
Streaming current formula can obtain:
I2=K* (Vgs-Vth)2
=K* (Vdata+Vth-Vdd-Vth)2
=K* (Vdd-Vdata)2
I2 is the driving current of driving transistor DTFT output after carrying out threshold compensation.Since Vdata is less than Vdd, and Vth
For negative value, then K* (Vdd-Vdata)2Greater than K* (Vdd+Vth-Vdata)2, i.e. I2 is greater than I1.It can be seen that the prior art is right
It when p-type drives transistor DTFT to carry out threshold compensation, can that transistor DTFT is driven to correspond to its output of identical data voltage
Driving current increase, the current density of the organic luminous layer in luminescent device OLED necessarily increases, and influences luminescent device OLED
Service life.
To solve the above problems, the present invention provides a kind of new pixel circuit, display panel, display device and pixels to drive
Dynamic method.
It should be noted that the switching tube in the present invention can be thin film transistor (TFT) or field effect transistor or other characteristics
Identical switching device.Transistor generally comprises three poles: grid, source electrode and drain electrode, and the source electrode and drain electrode in transistor is being tied
It is that symmetrically, the two can be interchanged as needed on structure.In the present invention, control electrode refers to the grid of transistor, first
One of pole and the second pole are source electrode, and another one is drain electrode.
In addition, transistor can be divided into N-type transistor and P-type transistor according to transistor characteristic；When transistor is N-type
When transistor, conducting voltage is high level voltage, and blanking voltage is low level voltage；When transistor is P-type transistor,
Conducting voltage is low level voltage, and blanking voltage is high level voltage." significant level state " in the present invention refers at signal
In the voltage status that can control respective transistor conducting, " non-effective level state " refers to that signal can control respective transistor
The voltage status of cut-off；Therefore, when transistor is N-type transistor, significant level state refers to high level state, non-effective electricity
Level state refers to low level state；When transistor is P-type transistor, significant level state refers to low level state, non-effective
Level state refers to high level state.In the present invention, driving transistor is only limited as P-type transistor, and is N to each switching tube
Type or p-type are not construed as limiting.
Embodiment one
Fig. 2 is a kind of circuit diagram for pixel circuit that the embodiment of the present invention one provides, as shown in Fig. 2, the pixel is electric
Road includes: driving transistor DTFT, luminescent device OLED, resetting sub-circuit 1, threshold voltage compensation sub-circuit 2 and current density
Compensate sub-circuit 3；The control electrode for driving transistor DTFT, the first pole for driving transistor DTFT, driving transistor DTFT the
Two poles are connected to first node N1, second node N2 and third node N3 with threshold voltage compensation sub-circuit 2 respectively.
Wherein, resetting sub-circuit 1 is connect with first control signal line E1, the first power end, first node N1, in weight
It, will be provided by the first power end in response to the control of first control signal provided by first control signal line E1 when setting the stage
First operating voltage is written to first node N1.
Threshold voltage compensation sub-circuit 2 also with grid line Gate, second control signal line E2, data line Data, second source
End connection, for the control at the threshold compensation stage in response to scanning signal provided by grid line Gate, by first node N1
It is connected with third node N3, and data voltage provided by data line Data is written to second node N2, so that first segment
Voltage at point N1 charges to the first offset voltage；And it is provided at the stage of display in response to second control signal line E2
Second control signal control, the second operating voltage provided by second source end is written to second node N2.
It should be noted that at the threshold compensation stage, the voltage at second node N2 is Vdata, at second node N2
Signal charged by driving transistor DTFT, third node N3 to first node N1, until the electricity at first node N1
When pressure charges to Vdata+Vth, driving transistor DTFT cut-off, charging terminates.Therefore, the first offset voltage V1=Vdata+
Vth。
Current density compensates sub-circuit 3 and second control signal line E2, third control signal wire E3, the first power end, hair
The first pole of optical device OLED connects, for controlling at the stage of display in response to provided by second control signal line E2 second
Third provided by signal, third control signal wire E3 controls the control of signal, by the first offset voltage at first node N1
It is promoted to the second offset voltage, wherein V2=V1+ △ V=Vdata+Vth+ △ V, V2 indicate the second offset voltage, and △ V is indicated
For the current density at reduction luminescent device OLED, preset offset voltage, △ V are positive value.
The first pole of luminescent device OLED is connect with third node N3, the second pole of luminescent device OLED and third power end
Connection.
Transistor DTFT is driven to be used at the stage of display in response to the control of the second offset voltage, to luminescent device OLED
Output driving current, to drive luminescent device OLED to be shown.
In the present embodiment, as reset voltage Vint, second source end mentions the first operating voltage provided using the first power end
The second operating voltage supplied is high level operating voltage Vdd, and the third operating voltage that third power end provides is low level work
It is described for voltage Vss (Vss as the reference voltage, generally OV).In addition, preset offset voltage △ V is less than
Vdd-Vdata_max, wherein Vdata_max is the maximum value for the data voltage that data line Data is capable of providing.
At the stage of display, the voltage Vdata+Vth at first node N1 is pulled to by current density compensation sub-circuit 3
Vdata+Vth+ △ V, high level operating voltage is written to second node N2 in threshold voltage compensation sub-circuit 2, at this time according to driving
The saturation drive current formula of transistor DTFT can obtain:
I3=K* (Vgs-Vth)2
=K* (Vdata+Vth+ △ V-Vdd-Vth)2
=K* (Vdata-Vdd+ △ V)2
=K* (Vdd-Vdata- △ V)2
Wherein, I3 is the driving current for after carrying out threshold compensation and carrying out driving transistor DTFT to export after voltage compensation.
Due to Vdd-Vdata > Vdd-Vdata- △ V > 0, K* (Vdd-Vdata)2> K* (Vdd-Vdata- △ V)2, i.e. I2 >
I3。
It can be seen that technical solution of the present invention can realize that the threshold voltage to driving transistor DTFT compensates
Meanwhile the driving current of driving transistor DTFT output reduces when also may make corresponding identical data voltage, luminescent device
The current density of organic luminous layer in OLED necessarily reduces, and the service life of luminescent device OLED can be promoted effectively.
It should be noted that the size of △ V can be designed according to actual needs in practical applications, adjusted, with
The reduction amount of the driving current of driving transistor output is controlled.
Embodiment two
Fig. 3 is a kind of circuit diagram of pixel circuit provided by Embodiment 2 of the present invention, as shown in figure 3, picture shown in Fig. 3
Plain circuit is a kind of concrete scheme based on pixel circuit shown in Fig. 2.
Optionally, threshold voltage compensation sub-circuit 2 includes: first switch tube T1, second switch T2, third switch transistor T 3
With first capacitor C1.
The control electrode of first switch tube T1 is connect with grid line Gate, and the first pole of first switch tube T1 and second node N2 connect
It connects, the second pole and the data line Data of first switch tube T1 connects.
The control electrode of second switch T2 is connect with grid line Gate, and the first pole of second switch T2 and first node N1 connect
It connects, the second pole of second switch T2 is connect with third node N3.
The control electrode of third switch transistor T 3 is connect with second control signal line E2, the first pole and second of third switch transistor T 3
Power end connection, the second pole of third switch transistor T 3 is connect with second node N2.
The first end of first capacitor C1 is connect with second source end, and the second end and first node N1 of first capacitor C1 connects
It connects.
Optionally, current density compensation sub-circuit 3 includes: the 4th switch transistor T 4, the 5th switch transistor T 5 and the second capacitor C2.
The control electrode of 4th switch transistor T 4 is connect with second control signal line E2, the first pole and second of the 4th switch transistor T 4
Power end connection, the second pole of the 4th switch transistor T 4 is connect with the second end of the second capacitor C2.
The control electrode of 5th switch transistor T 5 is connect with third control signal wire E3, the first pole and second of the 5th switch transistor T 5
The second end of capacitor C2 connects, and the second pole of the 5th switch transistor T 5 is connect with the first pole of luminescent device OLED.Second capacitor C2
First end connect with first node N1.
Optionally, resetting sub-circuit 1 includes: the 6th switch transistor T 6；The control electrode of 6th switch transistor T 6 is believed with the first control
Number line E1 connection, the first pole of the 6th switch transistor T 6 are connect with the first power end, the second pole of the 6th switch transistor T 6 and first segment
Point N1 connection.
Optionally, pixel circuit further include: the first pole of light emitting control sub-circuit 4, luminescent device OLED passes through the control that shines
System circuit 4 is connect with third node N3.
Light emitting control sub-circuit 4 is connect with third control signal wire E3, for controlling at the stage of display in response to third
The first pole of luminescent device OLED is connected with third node N3 for the control of signal.
In the present invention, by the way that light emitting control sub-circuit 4 is arranged, driving transistor DTFT can be avoided at the non-display stage
The electric current that place generates flows through luminescent device OLED and luminescent device OLED is caused to miss luminous problem.
Still optionally further, light emitting control sub-circuit 4 includes: the 7th switch transistor T 7；The control electrode of 7th switch transistor T 7 with
The E2 connection of second control signal line, the first pole of the 7th switch transistor T 7 are connect with third node N3, and the second of the 7th switch transistor T 7
Pole is connect with the first pole of luminescent device OLED.
The course of work of pixel circuit shown in Fig. 3 is described in detail below in conjunction with attached drawing.In the present embodiment with
The first operating voltage that first power end provides is reset voltage Vint, and the second operating voltage that second source end provides is high electricity
Flat operating voltage Vdd, the third operating voltage that third power end provides are low level operating voltage Vss, and each switching tube is p-type
It is described for transistor；At this point, the first of luminescent device OLED the extremely anode, the second extremely cathode.Furthermore, it is assumed that shining
The threshold voltage of device OLED is Voled, and Voled is greater than 0.
For convenience of description, by the second end of the second capacitor C2, the second pole of the 4th switch transistor T 4, the 5th switch transistor T 5
The tie point of one pole is denoted as fourth node N4.
Fig. 4 is the working timing figure of pixel circuit shown in Fig. 3, as shown in figure 4, the course of work of the pixel circuit includes such as
Lower three phases:
Reset phase t1；First control signal in first control signal line E1 is in low level state, the second control letter
Second control signal in number line E2 is in high level state, and the third control signal in third control signal wire E3 is in low electricity
Level state, the scanning signal in grid line Gate are in high level state.At this point, the 5th switch transistor T 5 and the 6th switch transistor T 6 are led
It is logical, first switch tube T1, second switch T2, third switch transistor T 3, the 4th switch transistor T 4 and the cut-off of the 7th switch transistor T 7.
Since the 5th switch transistor T 5 is connected, then the voltage Voled at the anode of luminescent device OLED can pass through the 5th switch
Pipe T5, which is written to fourth node N4, (can also regard fourth node N4 as and be discharged by third power end), at this time fourth node N4
The voltage at place is Voled；At the same time, since the 6th switch transistor T 6 is connected, reset voltage Vint can pass through the 6th switch transistor T 6
To first node N1, the voltage at the place first node N1 is Vint for write-in.
Threshold compensation stage t2；First control signal in first control signal line E1 is in high level state, the second control
Second control signal in signal wire E2 processed is in high level state, and the third control signal in third control signal wire E3 is in
Low level state, the scanning signal in grid line Gate are in low level state.At this point, first switch tube T1, second switch T2
It is connected with the 5th switch transistor T 5, third switch transistor T 3, the 4th switch transistor T 4, the 6th switch transistor T 6 and the cut-off of the 7th switch transistor T 7.
Since first switch tube T1 and second switch T2 is connected, then the signal at second node N2 passes through driving transistor
DTFT, third node N3 charge to first node N1, until when the voltage at first node N1 charges to Vdata+Vth,
Transistor DTFT cut-off is driven, charging terminates, i.e. the first offset voltage V1=Vdata+Vth.At the same time, due to the 5th switch
Pipe T5 maintains conducting, then third node N3 voltage is maintained Voled；The voltage difference of the two ends of the second capacitor C2 is Vdata+ at this time
Vth-Voled。
Display stage t3；First control signal in first control signal line E1 is in high level state, the second control letter
Second control signal in number line E2 is in low level state, and the third control signal in third control signal wire E3 is in high electricity
Level state, the scanning signal in grid line Gate are in high level state.At this point, third switch transistor T 3, the 4th switch transistor T 4 and
The conducting of seven switch transistor Ts 7, first switch tube T1, second switch T2, the 5th switch transistor T 5 and the cut-off of the 6th switch transistor T 6.
Since second switch T2 and the 6th switch transistor T 6 end, then first node N1 is in floating
(Floating).Again since third switch transistor T 3 is connected, then high level operating voltage Vdd is written by third switch transistor T 3 to the
The voltage of two node N2, second node N2 are Vdd.
Since the 4th switch transistor T 4 is connected, then high level operating voltage Vdd is written by the 4th switch transistor T 4 to Section four
Point N4, the i.e. voltage of fourth node N4 rise to Vdd by Voled.Due to capacitor boot strap, the voltage of first node N1 can phase
It should rise, and the size risen isWherein c1 and c2 is respectively first capacitor C1 and the second capacitor
The capacitance size of C2.In the present embodiment, withAs preset offset voltage △ V, to adjust
Driving current of the low driving transistor DTFT in the output of display stage.At this point, the voltage jump of first node N1 is Vdata+Vth
+ △ V, wherein
It can be seen that the threshold value electricity of control high level operating voltage Vdd, luminescent device OLED can be passed through in practical applications
Pressure is the capacitance size c2 of Voled, the capacitance size c1 of first capacitor C1, the second capacitor C2, so as to offset voltage △ V's
Size is set.
It can be obtained according to the saturation drive current formula of driving transistor DTFT at this time:
By above formula as it can be seen that the threshold voltage of driving current caused by driving transistor DTFT and driving transistor DTFT
It is unrelated, and then the influence for driving the threshold voltage of transistor DTFT to the driving current of luminescent device OLED is eliminated, it is promoted aobvious
The brightness uniformity of luminescent device OLED in showing device.Further, since the presence of offset voltage △ V, may make correspondence identical
The driving current of transistor DTFT output is driven to reduce when data voltage, the electric current of the organic luminous layer in luminescent device OLED is close
Degree necessarily reduces, and the service life of luminescent device OLED can be promoted effectively.
It should be noted that first switch tube~the 7th switching tube and driving transistor are p-type crystalline substance in the present embodiment
The case where body pipe, is one of present invention preferred embodiment, same transistor fabrication processes can be used at this time with simultaneously
Above-mentioned switching tube and driving transistor are prepared, so as to save production process, shorten the production cycle.
Embodiment three
Fig. 5 is a kind of circuit diagram for pixel circuit that the embodiment of the present invention three provides, as shown in figure 5, with above-mentioned reality
Applying the 4th switch transistor T 4 and the 5th switch transistor T 5 in example two is unlike in P-type transistor, and the in the present embodiment the 4th opens
Closing one of pipe T4 and the 5th switch transistor T 5 is N-type transistor, and another one is P-type transistor, second control signal line E2 and
Third control signal wire E3 is same control signal wire.
It should be noted that merely exemplary the 4th switch transistor T 4 that provides is P-type transistor in attached drawing, the 5th switch transistor T 5 is
The case where N-type transistor, the control electrode of the 4th switch transistor T 4 and the control electrode of the 5th switch transistor T 5 are all connected with the second control at this time
Signal wire E2 (timing of second control signal referring to fig. 4 shown in).At this point, no longer needing to that third additionally is arranged in the pixel circuit
Control signal wire E3, so as to effectively simplify the complexity of pixel circuit.
Certainly, N-type crystalline substance can also be used in third switch transistor T 3, the 4th switch transistor T 4, the 7th switch transistor T 7 in the present embodiment
Body pipe, and the 5th switch transistor T 5 uses P-type transistor, the at this time control of the control electrode of third switch transistor T 3, the 4th switch transistor T 4
The control electrode of pole, the control electrode of the 7th switch transistor T 7 and the 5th switch transistor T 5 is all connected with third control signal wire E3 (third control
The timing of signal referring to fig. 4 shown in)；At this point, no longer need to that second control signal line E2 is additionally arranged in the pixel circuit, thus
The complexity of pixel circuit can effectively be simplified；Such situation does not provide respective drawings.
Content in previous embodiment two can be found in the description of the course of work of pixel circuit in this present embodiment, herein
It repeats no more.
Example IV
Fig. 6 is a kind of flow chart for image element driving method that the embodiment of the present invention four provides, as shown in fig. 6, the pixel is driven
Dynamic method based on the above embodiment in one~embodiment three any offer pixel circuit, the structure of the pixel circuit is described
It can be found in the content in previous embodiment, details are not described herein again, which includes:
Step S1, in reset phase, the first operating voltage is written in response to the control of first control signal for reset circuit
To first node.
Step S2, in the threshold compensation stage, threshold voltage compensation sub-circuit is mended in response to the control of scanning signal by first
Voltage is repaid to be written to first node.
Specifically, first node is connected threshold voltage compensation sub-circuit with third node, and will be provided by data line
Data voltage is written to second node, and the signal at second node is carried out by driving transistor, third node to first node
Charging, until driving transistor DTFT cut-off, charging terminates when the voltage at first node charges to Vdata+Vth.At this point,
First offset voltage V1=Vdata+Vth.
Step S3, in the display stage, current density compensates sub-circuit and controls signal in response to second control signal and third
Control, the first offset voltage at first node is promoted to the second offset voltage, threshold voltage compensation sub-circuit in response to
Second operating voltage is written to second node, drives transistor in response to the second offset voltage by the control of second control signal
Control, to luminescent device output driving current, to drive luminescent device to be shown.
Wherein, the second offset voltage V2=V1+ △ V, △ V is expressed as reducing the current density at the luminescent device OLED
And preset offset voltage.
Corresponding contents in previous embodiment can be found in for the specific descriptions of above steps, be not described in detail herein.
Technical solution of the present invention not only can carry out threshold compensation to driving transistor, also may make corresponding identical data
The driving current of transistor output is driven to reduce when voltage, the current density of the organic luminous layer in luminescent device reduces, thus
The service life of luminescent device can be promoted.
Embodiment five
The embodiment of the present invention five provides a kind of display panel, which includes pixel circuit, wherein pixel electricity
Road is using the pixel circuit any in one~embodiment of above-described embodiment three.
In this example it is shown that panel further include: N grid line and M data line, whole grid lines and all of data lines limit
M*N pixel unit is made, each pixel unit includes one such as above-mentioned pixel circuit.Wherein, positioned at the pixel electricity of line n
Road corresponds to nth grid line, and positioned at the corresponding m data line of the pixel unit of m column, 1≤n≤N, 1≤m≤M, N and M are whole
Number.
Preferably, in addition to the pixel circuit for being located at the first row, in the pixel circuit for being located at other rows, the pixel circuit institute
The first control signal line of connection is a grid line corresponding to the pixel circuit positioned at its own previous row.Below in conjunction with attached
Figure is described.
It is located at line n in the display panel that Fig. 7 provides for the embodiment of the present invention five, the circuit for the pixel unit that m is arranged shows
It is intended to, as shown in fig. 7, grid line corresponding to the pixel unit is nth grid line Gate_n (first switch tube T1 and second switch
The control electrode of pipe T2 is all connected with grid line Gate_n), data line Data corresponding to the pixel unit is m data line Data_m
(the second pole of first switch tube T1 connects data line Data_m).
In the pixel unit, the first control signal line E1 that the control electrode of the 6th switch transistor T 6 is connected is positioned at n-th-
(control electrode of the 6th switch transistor T 6 connects grid line Gate_n- to (n-1)th article of grid line Gate_n-1 corresponding to the pixel unit of 1 row
1)。
Grid line Gate is multiplexed in the present embodiment and is believed positioned at the first control that the pixel unit of its next line is connected
Number line E1, because without in additionally setting first control signal line E1, so as to effectively reduce the number of signal wire in display panel
Amount is conducive to promote pixel aperture ratio.
In addition, another one is P-type crystal when one of the 4th switch transistor T 4 and the 5th switch transistor T 5 are N-type transistor
Pipe, and second control signal line E2 and third control signal wire E3 be same control signal wire when, at this time be directed to every row pixel list
Member only need one control signal wire of setting (a second control signal line E2 or a third control signal wire E3, in attached drawing only
It is exemplary to give the case where pixel unit is only connect with second control signal line E2).
Embodiment six
The embodiment of the present invention six provides a kind of display device, which includes: display panel, which adopts
With the display panel provided in above-described embodiment five, the content that can be found in above-described embodiment five is specifically described, it is no longer superfluous herein
It states.
It should be noted that the display device in the present invention can specifically include: Electronic Paper, oled panel, mobile phone, plate
Any products or components having a display function such as computer, television set, display, laptop, Digital Frame, navigator.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, essence of the invention is not being departed from
In the case where mind and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (11)
1. a kind of pixel circuit characterized by comprising driving transistor, luminescent device, resetting sub-circuit, threshold voltage are mended
Repay sub-circuit and current density compensation sub-circuit；
The control electrode of the driving transistor, the first pole of the driving transistor, second pole for driving transistor, respectively
First node, second node and third node are connected to the threshold voltage compensation sub-circuit；
The resetting sub-circuit is connect with first control signal line, the first power end, the first node, in reset phase
When in response to first control signal provided by the first control signal line control, will be provided by first power end
First operating voltage is written to the first node；
The threshold voltage compensation sub-circuit is also connect with grid line, second control signal line, data line, second source end, is used for
At the threshold compensation stage in response to the control of scanning signal provided by the grid line, by the first node and the third
Node conducting, and data voltage provided by the data line is written to the second node, so that the first node
The voltage at place charges to the first offset voltage；And at the stage of display in response to provided by the second control signal line
Second operating voltage provided by the second source end is written to the second node for the control of second control signal；
The current density compensation sub-circuit and the second control signal line, the third control signal wire, first electricity
The first pole connection of source, the luminescent device, is used at the display stage in response to the second control signal line institute
Third provided by the second control signal of offer, the third control signal wire controls the control of signal, by the first segment
First offset voltage at point is promoted to the second offset voltage, wherein V2=V1+ △ V, V1 indicate the first compensation electricity
Pressure, V2 indicate second offset voltage, and △ V is expressed as reducing the current density at the luminescent device and preset benefit
Repay voltage；
First pole of the luminescent device is connect with the third node, and the second pole of the luminescent device and third power end connect
It connects；
The driving transistor is used to shine in response to the control of second offset voltage to described at the display stage
Device output driving current, to drive the luminescent device to be shown.
2. pixel circuit according to claim 1, which is characterized in that the threshold voltage compensation sub-circuit includes: first
Switching tube, second switch, third switching tube and；
The control electrode of the first switch tube is connect with the grid line, the first pole of the first switch tube and the second node
Connection, the second pole and the data line of the first switch tube connect；
The control electrode of the second switch is connect with the grid line, the first pole of the second switch and the first node
Connection, the second pole of the second switch is connect with the third node；
The control electrode of the third switching tube is connect with the second control signal line, the first pole of the third switching tube and institute
The connection of second source end is stated, the second pole of the third switching tube is connect with the second node；
The first end of the first capacitor is connect with the second source end, the second end of the first capacitor and the first segment
Point connection.
3. pixel circuit according to claim 1, which is characterized in that the current density compensation sub-circuit includes: the 4th
Switching tube, the 5th switching tube and the second capacitor；
The control electrode of 4th switching tube is connect with the second control signal line, the first pole of the 4th switching tube and institute
The connection of second source end is stated, the second pole of the 4th switching tube is connect with the second end of second capacitor；
The control electrode of 5th switching tube is connect with the third control signal wire, the first pole of the 5th switching tube and institute
The second end connection of the second capacitor is stated, the second pole of the 5th switching tube is connect with the first pole of the luminescent device；
The first end of second capacitor is connect with the first node.
4. pixel circuit according to claim 3, which is characterized in that in the 4th switching tube and the 5th switching tube
One of be N type switch tube, another one be p-type switching tube；
The second control signal line and the third control signal wire are same control signal wire.
5. pixel circuit according to claim 1, which is characterized in that the resetting sub-circuit includes: the 6th switching tube；
The control electrode of 6th switching tube is connect with the first control signal line, the first pole of the 6th switching tube and institute
The connection of the first power end is stated, the second pole of the 6th switching tube is connect with the first node.
6. pixel circuit according to claim 1, which is characterized in that further include: light emitting control sub-circuit, the photophore
First pole of part is connect by the light emitting control sub-circuit with the third node；
The light emitting control sub-circuit is connect with the third control signal wire, is used at the display stage in response to described
Third controls the control of signal, and the first pole of the luminescent device is connected with the third node.
7. pixel circuit according to claim 6, which is characterized in that the light emitting control sub-circuit includes: the 7th switch
Pipe；
The control electrode of 7th switching tube is connect with the second control signal line, the first pole of the 7th switching tube and institute
The connection of third node is stated, the second pole of the 7th switching tube is connect with the first pole of the luminescent device.
8. a kind of display panel characterized by comprising the pixel circuit as described in any in the claims 1-7.
9. display panel according to claim 8, which is characterized in that the display panel further include: several grid lines and
Several data lines, all the grid line and whole data lines limit several pixel units, the electricity of pixel described in every row
Road corresponds to a grid line；
In addition to the pixel circuit for being located at the first row, in the pixel circuit for being located at other rows, what which was connected
The first control signal line is a grid line corresponding to the pixel circuit positioned at its own previous row.
10. a kind of display device characterized by comprising the display panel as described in the claims 8 or 9.
11. a kind of image element driving method, which is characterized in that the image element driving method is based on pixel circuit, the pixel circuit
Using the pixel circuit any in the claims 1-7, the image element driving method includes:
In the reset phase, the resetting sub-circuit works in response to the control of the first control signal by described first
Voltage is written to the first node；
In the threshold compensation stage, the threshold voltage compensation sub-circuit in response to the scanning signal control, by described first
Offset voltage is written to the first node；
In the display stage, the current density compensation sub-circuit is controlled in response to the second control signal and the third
First offset voltage at the first node is promoted to the second offset voltage, the threshold voltage by the control of signal
Sub-circuit is compensated in response to the control of the second control signal, second operating voltage is written to second node, it is described
Drive transistor in response to the control of second offset voltage, to the luminescent device output driving current, described in driving
Luminescent device is shown.
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| CN201811288354.5A CN109256088B (en) | 2018-10-31 | 2018-10-31 | Pixel circuit, display panel, display device and pixel driving method |
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| CN201811288354.5A CN109256088B (en) | 2018-10-31 | 2018-10-31 | Pixel circuit, display panel, display device and pixel driving method |
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