CN108053792B - A kind of pixel circuit and its driving method, display device - Google Patents
A kind of pixel circuit and its driving method, display device Download PDFInfo
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- CN108053792B CN108053792B CN201810054566.0A CN201810054566A CN108053792B CN 108053792 B CN108053792 B CN 108053792B CN 201810054566 A CN201810054566 A CN 201810054566A CN 108053792 B CN108053792 B CN 108053792B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
Abstract
This application discloses a kind of pixel circuit and its driving methods, display device, including light emitting diode, storage capacitance, driving transistor, first switch transistor, second switch transistor, third switching transistor, the 4th switching transistor, the 5th switching transistor, the 6th switching transistor.In the compensated stage of pixel circuit, the grid of driving transistor is connect with source electrode, it is formed from the second end of storage capacitance and flows through driving transistor, third switching transistor, 4th switching transistor is to initial voltage signal line, make to drive the grid of transistor identical with the voltage of drain electrode, drive the source voltage of transistor consistent with the voltage of the second end of storage capacitance, and the second end voltage of storage capacitance includes drive transistor threshold voltage, include threshold voltage in gate source voltage to make to drive transistor, and then in the light emitting phase of pixel circuit, the electric current for flowing through light emitting diode is unrelated with drive transistor threshold voltage, to realize the compensation to drive transistor threshold voltage.
Description
Technical field
This application involves field of display technology more particularly to a kind of pixel circuits and its driving method, display device.
Background technique
Active-matrix organic light-emitting display device (AMOLED) drives Organic Light Emitting Diode.Active-matrix organic display dress
Set multiple pixels of the infall including being arranged between scan line and data line.In addition, each pixel includes organic light emission two
Pole pipe and pixel circuit for driving Organic Light Emitting Diode.Pixel circuit is usually by multiple switch transistor, driving crystal
Pipe and storage composition.
As made of transistor technology the problems such as uniformity, cause the threshold voltage of transistor uneven, to influence
The display effect of panel.Moreover, power supply cabling problem of pressure drop becomes to be particularly acute, in turn as AMOLED panel becomes large-sized
Influence the display effect of display panel.
Summary of the invention
The embodiment of the present application provides a kind of pixel circuit and its driving method, display device, for solving in the prior art
As made of transistor technology the problems such as uniformity, lead to the non-uniform problem of the threshold voltage of transistor.
The embodiment of the present application adopts the following technical solutions:
In a first aspect, this application provides a kind of pixel circuit, the pixel circuit includes:
Light emitting diode, storage capacitance, driving transistor, first switch transistor, second switch transistor, third switch
Transistor, the 4th switching transistor, the 5th switching transistor, the 6th switching transistor, wherein
The source electrode of the driving transistor respectively with the drain electrode of the first switch transistor and the storage capacitance the
The connection of two ends, the source electrode of the first switch transistor are connect with the first power supply；
The grid of the driving transistor switchs crystal with the drain electrode of the second switch transistor and the third respectively
The source electrode of pipe connects, and the source electrode of the second switch transistor is switched with the first end of the storage capacitance and the described 5th respectively
The source electrode of transistor connects, and the drain electrode of the 5th switching transistor is connect with data line；
It is described driving transistor drain electrode respectively with the drain electrode of the third switching transistor, the 4th switching transistor
Source electrode and the 6th switching transistor source electrode connection, the drain electrode of the 4th switching transistor and initial voltage signal line
Connection；The drain electrode of 6th switching transistor is connect with the light emitting diode, and the light emitting diode and second source connect
It connects.
Further, the voltage of the initial voltage signal is lower than the voltage of the second source.
Further, first power supply, for providing supply voltage for the driving transistor；
Electric current flows into the second source when lumination of light emitting diode.
Further, the initial voltage signal line provides initial voltage signal, and the initial voltage signal is negative voltage,
Anode for grid and drain electrode, the light emitting diode to the driving transistor initializes.
Further, the grid of the first switch transistor, the grid of the second switch transistor and the described 6th
The grid of switching transistor is connect with the first scan line, the first scanning signal control described first that first scan line provides
When switching transistor, the second switch transistor and the 6th switching transistor in the conductive state, the light-emitting diodes
Pipe shines；
The grid of the third switching transistor is connect with the second scan line, the second scanning that second scan line provides
When the signal control third switching transistor is in the conductive state, the threshold voltage of the driving transistor is compensated；
The grid of 4th switching transistor and the grid of the 5th switching transistor are connect with third scan line, institute
The third scanning signal for stating the offer of third scan line controls the 4th switching transistor and the 5th switching transistor is in
When on state, the anode of grid and drain electrode, the light emitting diode to the driving transistor is initialized.
Further, the driving transistor, the first switch transistor, the second switch transistor, described
Three switching transistors, the 4th switching transistor, the 5th switching transistor and the 6th switching transistor are PMOS
Transistor.
Further, the data line provides data voltage signal, and the data voltage signal passes through the 5th switch
Transistor applies voltage to the first end of the storage capacitance, and the grid of the driving transistor and the voltage of drain electrode are mutually all
Vinit, the second end of the storage capacitance carry out being discharged to voltage Vinit+ | Vth |, realize to the driving transistor threshold
The compensation of voltage, wherein Vinit is the initial voltage, and Vth is the threshold voltage of the driving transistor.
Further, apply supply voltage to the source electrode of the driving transistor in first power supply, the driving is brilliant
The voltage of the drain and gate of body pipe is mutually all Vinit, and the voltage of the source electrode of the driving transistor drops to Vinit+ | Vth
|, realize the compensation of the threshold voltage to the driving transistor, wherein Vinit is the initial voltage, and Vth is the driving
The threshold voltage of transistor.
Second aspect, this application provides a kind of driving methods of pixel circuit, comprising:
First stage, the first scanning signal control the first switch transistor, the second switch transistor and described
6th switching transistor is in the conductive state, and the second scanning signal controls the third switching transistor and is in off state, the
Three scanning signals control the 4th switching transistor and the 5th switching transistor is in the conductive state, initial voltage signal
The anode of grid and drain electrode, light emitting diode to the first film transistor initializes；
Second stage, the first scanning signal control the first switch transistor, the second switch transistor and described
6th switching transistor is in off state, and the second scanning signal control third switching transistor is in the conductive state, the
Three scanning signals control the 4th switching transistor and the 5th switching transistor is in the conductive state, to the drive membrane
The threshold voltage of transistor compensates；
Phase III, the first scanning signal control the first switch transistor, the second switch transistor and described
6th switching transistor is in the conductive state, and the second scanning signal controls the third switching transistor and is in off state, the
Three scanning signals control the 4th switching transistor and the 5th switching transistor and be in off state, described in electric current inflow
Light emitting diode, the lumination of light emitting diode.
Further, in the second stage, the source voltage of the driving transistor is Vinit+ | Vth |, the drive
The grid voltage of dynamic transistor is Vinit, realizes the compensation of the threshold voltage to the driving transistor, wherein Vinit is institute
Initial voltage is stated, Vth is the threshold voltage of the driving transistor.
Further, in the phase III, the second end voltage of the storage capacitance is Vdd, the storage capacitance
First end voltage is Va=Vdata+Vdd- | Vth |-Vinit, the electric current Ids for flowing through the driving transistor is β/2 (Vgs-
Vth)2=β/2 (Vdd-Vdata-Vdd- | Vth |+Vinit+ | Vth |)2=β/2 (Vinit-Vdata)2, realize to the driving
The compensation of the pressure drop of the compensation and first power supply of the threshold voltage of transistor；
Wherein, Vdata is the data voltage, and Vdd is the voltage of the first power supply, and Vinit is the initial voltage, Vth
For it is described driving transistor threshold voltage, Vgs be the storage capacitance second end and it is described driving transistor grid it
Between pressure difference, β is constant.
The third aspect, this application provides a kind of display device, which includes: pixel circuit described above.
The embodiment of the present application use at least one above-mentioned technical solution can reach it is following the utility model has the advantages that
Pixel circuit provided by the embodiments of the present application drives grid and the source of transistor in the compensated stage of pixel circuit
Pole connection forms from the second end of storage capacitance and flows through driving transistor, third switching transistor, the 4th switching transistor to first
Beginning voltage signal line drives source voltage and the storage of transistor so that the grid of driving transistor is identical with the voltage of drain electrode
The voltage of the second end of capacitor is consistent, and the voltage of the second end of storage capacitance includes the threshold voltage of driving transistor, thus
Make to drive the threshold voltage comprising driving transistor in the gate source voltage of transistor, so that in the luminous rank of pixel circuit
Section, the electric current for flowing through light emitting diode is unrelated with the driving threshold voltage of transistor, to realize to driving transistor threshold electricity
The compensation of pressure.
In addition, flowing through the electric current of light emitting diode and the source for being applied to driving transistor in the light emitting phase of pixel circuit
The voltage of first power supply of pole is unrelated, to realize the compensation of the pressure drop of the first power supply.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present application, constitutes part of this application, this Shen
Illustrative embodiments and their description please are not constituted an undue limitation on the present application for explaining the application.In the accompanying drawings:
Fig. 1 is a kind of structural schematic diagram of pixel circuit provided by the embodiments of the present application；
Fig. 2 is a kind of timing diagram of the driving method of pixel circuit provided by the embodiments of the present application.
Specific embodiment
To keep the purposes, technical schemes and advantages of the application clearer, below in conjunction with the application specific embodiment and
Technical scheme is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the application one
Section Example, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall in the protection scope of this application.
Fig. 1 is the structural schematic diagram of pixel circuit provided by the embodiments of the present application.As shown in Figure 1, the embodiment of the present application mentions
The pixel circuit of confession may include: light emitting diode D1, storage capacitance C, driving transistor T, first switch transistor T1, second
Switching transistor T2, third switching transistor T3, the 4th switching transistor T4, the 5th switching transistor T5, the 6th switch crystal
Pipe T6.
Wherein, in pixel circuit shown in FIG. 1, transistor T, first switch transistor T1, second switch transistor are driven
T2, third switching transistor T3, the 4th switching transistor T4, the 5th switching transistor T5, the 6th switching transistor T6 are
PMOS transistor.
The circuit connection structure of pixel circuit shown in FIG. 1 is as described below:
The source electrode of driving transistor T is connect with the second end of the drain electrode of first switch transistor T1 and storage capacitance C respectively,
The source electrode of first switch transistor T1 is connect with the first power supply Vdd.
Drive the grid source electrode with the drain electrode of second switch transistor T2 and third switching transistor T3 respectively of transistor T
Connection, the source electrode of second switch transistor T2 connect with the source electrode of the first end of storage capacitance C and the 5th switching transistor T5 respectively
It connects, the drain electrode of the 5th switching transistor T5 is connect with data line.
Drive the source electrode with the drain electrode of third switching transistor T3, the 4th switching transistor T4 respectively that drains of transistor T
And the 6th switching transistor T6 source electrode connection, the drain electrode of the 4th switching transistor T4 connect with initial voltage signal line；6th
The drain electrode of switching transistor T6 is connect with light emitting diode D1, and light emitting diode D1 is connect with second source Vss.
In the embodiment of the present application, the first power supply Vdd can be high level voltage, and for providing for driving transistor T
Supply voltage drives transistor T under the action of the first power supply Vdd, can export electric current, which flows into light emitting diode
D1, so that light emitting diode D1 shines, when light emitting diode D1 shines, which flows into second source Vss, second source
Vss can be low level voltage.
The data line is for providing data voltage Vdata, and the initial voltage signal line is for providing initial voltage letter
Number Vinit.In the embodiment of the present application, initial voltage signal Vinit can be negative voltage, and for the grid to driving transistor T
The anode of pole and drain electrode, light emitting diode D1 is initialized.
It should be noted that in the embodiment of the present application, initial voltage signal Vinit can be than second source Vss also than
Low negative pressure, in this way, initial voltage signal Vinit is when the anode to light emitting diode D1 initializes, it is ensured that hair
Optical diode D1 will not shine.Wherein, as one kind, optionally mode, initial voltage signal Vinit can be -3V.In addition, by
The anode of light emitting diode D1 can be initialized in the embodiment of the present application, it therefore, can be in the hair of light emitting diode D1
Photophase effectively avoids hesitation caused by light emitting diode D1.
In Fig. 1, Em is the first scanning signal that the first scan line provides, and Sn is the second scanning letter that the second scan line provides
Number, Sn-1 is the third scanning signal that third scan line provides.Wherein,
Grid, the grid of second switch transistor T2 and the grid of the 6th switching transistor T6 of first switch transistor T1
It is connect with the first scan line, the first scanning signal Em that the first scan line provides is for controlling first switch transistor T1, second
Switching transistor T2 and the 6th switching transistor T6 is in the conductive state or off state.In the embodiment of the present application, swept first
It is in the conductive state to retouch signal Em control first switch transistor T1, second switch transistor T2 and the 6th switching transistor T6
When, light emitting diode D1 shines.
The grid of third switching transistor T3 is connect with the second scan line, the second scanning signal Sn that the second scan line provides
For controlling, third switching transistor T3 is in the conductive state or off state.In the embodiment of the present application, in the second scanning signal
When Sn control third switching transistor T3 is in the conductive state, the threshold voltage of driving transistor T is compensated.
The grid of 4th switching transistor T4 and the grid of the 5th switching transistor T5 are connect with third scan line, and third is swept
The third scanning signal Sn-1 for retouching line offer is on for controlling the 4th switching transistor T4 and the 5th switching transistor T5
State or off state.In the embodiment of the present application, opened in third scanning signal Sn-1 control the 4th switching transistor T4 and the 5th
When pass transistor T5 is in the conductive state, the anode of grid and source electrode, light emitting diode D1 to driving transistor T carries out initial
Change.
Pixel circuit provided by the embodiments of the present application may be implemented to driving transistor compared to existing technologies
The compensation of threshold voltage, specifically includes:
Apply supply voltage, the drain electrode of the driving transistor to the source electrode of the driving transistor in first power supply
Mutually it is all Vinit with the voltage of grid, the voltage of the source electrode of the driving transistor drops to Vinit+ | Vth |, so that driving
The gate source voltage Vgs of transistor includes the threshold voltage vt h of driving transistor, to make the light emitting phase in pixel circuit, flows
Electric current Ids through light emitting diode are as follows: β/2 (Vgs-Vth)2, and then realize the benefit of the threshold voltage to the driving transistor
It repays, wherein Vinit is the initial voltage, and Vth is the threshold voltage of the driving transistor.
In addition, in the light emitting phase of pixel circuit, the expression formula for flowing through the electric current Ids of light emitting diode can be with are as follows:
β/2 Ids=(Vgs-Vth)2=β/2 (Vdd-Vdata-Vdd- | Vth |+Vinit+ | Vth |)2=β/2 (Vinit-
Vdata)2
Wherein, Vdata is data voltage, and Vdd is the voltage of the first power supply Vdd, and Vinit is initial voltage, and Vth is driving
The threshold voltage of transistor T, Vgs are the gate source voltage for driving transistor T, and β is constant.
From above formula it is found that flowing through the electricity of the electric current and the first power supply of the source electrode for being applied to driving transistor of light emitting diode
Press it is unrelated, to realize the compensation of the pressure drop of the first power supply.
Fig. 2 is a kind of timing diagram of the driving method of pixel circuit provided by the embodiments of the present application, and the timing diagram is corresponding
The driving method of pixel circuit can be used for driving pixel circuit shown in FIG. 1.
The driving method of the corresponding pixel circuit of timing diagram shown in Fig. 2 may include three phases: first stage t1,
Two-stage t2 and phase III t3, wherein
Em is the first scanning signal that the first scan line provides, and can be used for controlling first switch transistor shown in FIG. 1
T1, second switch transistor T2 and the 6th switching transistor T6 is in the conductive state or off state, Sn is that the second scan line mentions
The second scanning signal supplied, can be used for controlling that third switching transistor T3 shown in FIG. 1 is in the conductive state or off state,
Sn-1 is the third scanning signal that provides of third scan line, can be used for controlling the 4th switching transistor T4 shown in FIG. 1 and the
Five switching transistor T5 are in the conductive state or off state, Vdata are the data voltage that data line provides, and Vinit is initial
The initial voltage that voltage signal line provides.
The driving method of the corresponding pixel circuit of timing diagram shown in Fig. 2, specifically includes:
First stage t1, the first scanning signal Em control first switch transistor T1, second switch transistor T2 and the 6th
Switching transistor T6 is in the conductive state, and the second scanning signal Sn control third switching transistor T3 is in off state, third
Scanning signal Sn-1 control the 4th switching transistor T4 and the 5th switching transistor T5 is in the conductive state, and initial voltage signal will
Driving transistor grid voltage drag down dragged down with drain voltage, the anode voltage of light emitting diode D1 drags down, thus realize pair
The anode of the grid and drain electrode, light emitting diode D1 that drive transistor is initialized.
Second stage t2, the first scanning signal Em control first switch transistor T1, second switch transistor T2 and the 6th
Switching transistor T6 is in off state, and the second scanning signal Sn control third switching transistor T3 is in the conductive state, third
Scanning signal Sn-1 control the 4th switching transistor T4 and the 5th switching transistor T5 is in the conductive state, to driving transistor
Threshold voltage compensates.
Phase III t3, the first scanning signal Em control first switch transistor T1, second switch transistor T2 and the 6th
Switching transistor T6 is in the conductive state, and the second scanning signal Sn control third switching transistor T3 is in off state, third
Scanning signal Sn-1 control the 4th switching transistor T4 and the 5th switching transistor T5 is in off state, and electric current flows into luminous two
Pole pipe D1, light emitting diode D1 shine.
It is made a concrete analysis of separately below for the above three stage:
For first stage t1:
Since the first scanning signal Em is low level, the second scanning signal Sn is high level, and third scanning signal Sn-1 is
Low level, therefore, first switch transistor T1 are in the conductive state, at second switch transistor T2 and the 5th switching transistor T5
In on state, the 4th switching transistor T4 and the 6th switching transistor T6 are in the conductive state, at third switching transistor T3
In off state.
At this point, the first power supply Vdd applies voltage to the source electrode of driving transistor T, the first power supply Vdd is simultaneously to storage capacitance
The second end of C applies voltages to Vdd, and initial voltage signal Vinit is brilliant by the anode voltage of light emitting diode D1 and driving respectively
The grid voltage and drain voltage of body pipe T is pulled low to Vinit, to realize the anode and driving transistor to light emitting diode D1
The grid of T and drain electrode are initialized, meanwhile, data signal line is by the 5th switching transistor T5 to the first of storage capacitance C
End applies voltage, respectively drags down the anode voltage of the grid voltage for driving transistor T and drain voltage, light emitting diode D1,
The grid of driving transistor T and the anode of drain electrode, light emitting diode D1 are initialized so as to realize.
It should be noted that there is certain voltage, in the first stage t1 since light emitting diode D1 has capacity effect
The anode of light emitting diode D1 is initialized, so that the voltage of light emitting diode D1 reduces, and then in light emitting diode D1
Light emitting phase, light emitting diode D1 can be made to shine rapidly, effectively avoid hesitation caused by light emitting diode D1.
For first stage t1 to the transition stage t12 of second stage t2:
First scanning signal Em becomes high level from low level, and the second scanning signal Sn and third scanning signal Sn-1 are kept
Constant, at this point, the voltage of the first end of storage capacitance C still remains Vdata, the voltage of the second end of storage capacitance C is still
Remain Vdd.
For second stage t2:
Since the first scanning signal Em is high level, the second scanning signal Sn becomes low level, third scanning from high level
Signal Sn-1 is low level, and therefore, first switch transistor T1, second switch transistor T2 and the 6th switching transistor T6 are by leading
Logical state becomes off state, and third switching transistor T3 becomes on state from off state, the 4th switching transistor T4 and
5th switching transistor T5 is still on state.
At this point, data voltage Vdata is applied voltages to by the 5th switching transistor T5 to the first end of storage capacitance C
The source electrode of Vdata, driving transistor T are connect with grid, are driven the grid of transistor T identical as the voltage of drain electrode, are rapidly gone to
The second end of Vinit, storage capacitance C are discharged, and are down to voltage Vinit+ by voltage Vdd | Vth |, in this manner it is achieved that right
Drive the compensation of transistor T threshold voltage, wherein Vth is the threshold voltage for driving transistor T.
For first stage t2 to the transition stage t23 of second stage t3:
Third scanning signal Sn-1 becomes high level from low level, and the first scanning signal Em and the second scanning signal Sn are kept
It is constant, at this point, the left end substrate (a node as shown in figure 1) of storage capacitance C is maintained spaced apart by with the external world, a at the both ends storage capacitance C
Voltage between node and b node remains unchanged, i.e. Va-Vb=Vdata-Vinit- | Vth |.
For phase III t3:
Since the first scanning signal Em becomes low level, the second scanning signal Sn and third scanning signal Sn-1 from high level
It remains unchanged, therefore, first switch transistor T1, second switch transistor T2 and the 6th switching transistor T6 are become by off state
For on state, third switching transistor T3 becomes off state, the switch of the 4th switching transistor T4 and the 5th from state
Transistor T5 becomes off state from state.
At this point, the first power supply Vdd charges to the second end of storage capacitance C, make the voltage of the second end of storage capacitance C
Vdd is become from Vdata-Vth, according to principle of charge conservation, the voltage of the first end of storage capacitance C becomes Vdata+ from Vdata
Vdd-|Vth|-Vinit.At this point, the electric current by light emitting diode D1 namely the electric current Ids by driving transistor T, the electricity
Stream can indicate are as follows:
β/2 Ids=(Vgs-Vth)2=β/2 (Vdd-Vdata-Vdd- | Vth |+Vinit+ | Vth |)2=β/2 (Vinit-
Vdata)2
Wherein, Vdata is data voltage, and Vdd is the voltage of the first power supply Vdd, and Vinit is initial voltage, and Vth is driving
The threshold voltage of transistor T, Vgs are the gate source voltage for driving transistor T, and β is constant.
In the specific implementation, each electrical reference signal pressure can be with are as follows: Vdd=4.6V, Vss=-3V, VGH (high level)=7V,
VGL (low level)=- 7V, VREF (reference voltage)=- 2V, Vdata=-6.6V~-0.6V.
When it is implemented, using pixel circuit provided by the embodiments of the present application.If Ids is 675nA, transistor T is driven
Threshold voltage be -1V；If Ids is 658nA, driving the threshold voltage of transistor T is -1.5V；If Ids is 640nA, drive
The threshold voltage of dynamic transistor T is -2V.It is found that curent change is less than when the threshold voltage variation ± 0.5V of driving transistor T
5%.
When it is implemented, using pixel circuit provided by the embodiments of the present application.If Ids is 680nA, the electricity of the first power supply
Pressure Vdd is 4.8V；If Ids is 659nA, the voltage Vdd of the first power supply is 4.6V；If Ids is 638nA, the first power supply
Voltage Vdd is 4.4V.It is found that curent change is less than 5% when the voltage Vdd variation ± 0.2V of the first power supply.
As shown from the above formula, the electric current for flowing through light emitting diode D1 is unrelated with the driving threshold voltage of transistor T, realizes
Compensation to the threshold voltage of driving transistor T.In addition, flow through light emitting diode D1 electric current and the first power supply voltage without
It closes, realizes the compensation of the pressure drop of the first power supply.
The embodiment of the present application also provides a kind of display device, and the display device may include pixel circuit.Pixel electricity
Road may include: light emitting diode, storage capacitance, driving transistor, first switch transistor, second switch transistor, third
Switching transistor, the 4th switching transistor, the 5th switching transistor, the 6th switching transistor.
The circuit connection structure of the pixel circuit is as described below:
The source electrode of driving transistor is connect with the second end of the drain electrode of first switch transistor and storage capacitance respectively, and first
The source electrode of switching transistor is connect with the first power supply.
The grid of driving transistor is connect with the source electrode of the drain electrode of second switch transistor and third switching transistor respectively,
The source electrode of second switch transistor is connect with the source electrode of the first end of storage capacitance and the 5th switching transistor respectively, the 5th switch
The drain electrode of transistor is connect with data line.
Drive the source electrode and the 6th with the drain electrode of third switching transistor, the 4th switching transistor respectively that drains of transistor
The source electrode of switching transistor connects, and the drain electrode of the 4th switching transistor is connect with initial voltage signal line；6th switching transistor
Drain electrode connect with light emitting diode, light emitting diode is connect with second source.
Wherein, the grid of the grid of first switch transistor, the grid of second switch transistor and the 6th switching transistor
It is connect with the first scan line, the first scanning signal that the first scan line provides controls first switch transistor, second switch crystal
When pipe and the 6th switching transistor are in the conductive state, lumination of light emitting diode；
The grid of third switching transistor is connect with the second scan line, the second scanning signal control that the second scan line provides
When third switching transistor is in the conductive state, the threshold voltage of driving transistor is compensated；
The grid of 4th switching transistor and the grid of the 5th switching transistor are connect with third scan line, third scan line
When the third scanning signal of offer controls the 4th switching transistor and the 5th switching transistor in the conductive state, to driving crystal
The grid of pipe and the anode of drain electrode, light emitting diode are initialized.
Supplement is needed exist for, which can also include scanner driver, which sweeps first
It retouches signal, the second scanning signal and third scanning signal and is sequentially supplied to the first scan line, the second scan line and third scanning
Line.Data-signal is supplied to data line by data driver, the data driver.
In the embodiment of the present application, the specific implementation of pixel circuit and its technical effect reached are referring in above-described embodiment
Related content, the embodiment of the present application repeat no more.
It will be understood by those skilled in the art that although the preferred embodiment of the application has been described, but skill in the art
Art personnel once know basic creative concept, then additional changes and modifications may be made to these embodiments.So appended
Claim is intended to be construed to include preferred embodiment and all change and modification for falling into the application range.
Obviously, those skilled in the art can carry out various modification and variations without departing from the model of the application to the application
It encloses.In this way, if these modifications and variations of the application belong within the scope of the claim of this application and its equivalent technologies, then
The application is also intended to include these modifications and variations.
Claims (10)
1. a kind of pixel circuit characterized by comprising light emitting diode, storage capacitance, driving transistor, first switch are brilliant
Body pipe, second switch transistor, third switching transistor, the 4th switching transistor, the 5th switching transistor, the 6th switch crystal
Pipe, wherein
The source electrode second end with the drain electrode of the first switch transistor and the storage capacitance respectively of the driving transistor
Connection, the source electrode of the first switch transistor are connect with the first power supply；
The grid of the driving transistor respectively with the drain electrode of the second switch transistor and the third switching transistor
Source electrode connection, the source electrode of the second switch transistor switch crystal with the first end of the storage capacitance and the described 5th respectively
The source electrode of pipe connects, and the drain electrode of the 5th switching transistor is connect with data line；
The source with the drain electrode of the third switching transistor, the 4th switching transistor respectively that drains of the driving transistor
The connection of the source electrode of pole and the 6th switching transistor, the drain electrode of the 4th switching transistor and initial voltage signal line connect
It connects；The drain electrode of 6th switching transistor is connect with the light emitting diode, and the light emitting diode is connect with second source.
2. pixel circuit according to claim 1, which is characterized in that
The initial voltage signal line provides initial voltage signal, and the initial voltage signal is negative voltage, for the drive
The grid of dynamic transistor and the anode of drain electrode, the light emitting diode are initialized.
3. pixel circuit according to claim 2, which is characterized in that the voltage of the initial voltage signal is lower than described the
The voltage of two power supplys.
4. pixel circuit according to claim 2, which is characterized in that
The grid of the grid of the first switch transistor, the grid of the second switch transistor and the 6th switching transistor
Pole is connect with the first scan line, and the first scanning signal that first scan line provides controls the first switch transistor, institute
When stating second switch transistor and the 6th switching transistor in the conductive state, the lumination of light emitting diode；
The grid of the third switching transistor is connect with the second scan line, the second scanning signal that second scan line provides
Control the third switching transistor it is in the conductive state when, to it is described driving transistor threshold voltage compensate；
The grid of 4th switching transistor and the grid of the 5th switching transistor are connect with third scan line, and described
The third scanning signal that three scan line provides controls the 4th switching transistor and the 5th switching transistor is on
When state, the anode of grid and drain electrode, the light emitting diode to the driving transistor is initialized.
5. pixel circuit according to any one of claims 1 to 4, which is characterized in that
The data line provides data voltage signal, and the data voltage signal is deposited by the 5th switching transistor to described
The first end that storage is held applies voltage, and the grid of the driving transistor and the voltage of drain electrode are mutually all Vinit, the storage electricity
The second end of appearance carries out being discharged to voltage Vinit+ | Vth |, realize the compensation to the drive transistor threshold voltage, wherein
Vinit is the initial voltage, and Vth is the threshold voltage of the driving transistor.
6. pixel circuit according to any one of claims 1 to 4, which is characterized in that
Apply supply voltage, the drain electrode of the driving transistor and grid to the source electrode of the driving transistor in first power supply
The voltage of pole is mutually all Vinit, and the voltage of the source electrode of the driving transistor drops to Vinit+ | Vth |, realize to the drive
The compensation of the threshold voltage of dynamic transistor, wherein Vinit is the initial voltage, and Vth is the threshold value electricity of the driving transistor
Pressure.
7. it is a kind of according to claim 1~any one of 6 described in pixel circuit driving method characterized by comprising
First stage, the first scanning signal control the first switch transistor, the second switch transistor and the described 6th
Switching transistor is in the conductive state, and the second scanning signal controls the third switching transistor and is in off state, and third is swept
It retouches signal control the 4th switching transistor and the 5th switching transistor is in the conductive state, initial voltage signal is to institute
The anode of the grid and drain electrode, light emitting diode of stating first film transistor is initialized；
Second stage, the first scanning signal control the first switch transistor, the second switch transistor and the described 6th
Switching transistor is in off state, and the second scanning signal control third switching transistor is in the conductive state, and third is swept
It retouches signal control the 4th switching transistor and the 5th switching transistor is in the conductive state, to the drive membrane crystal
The threshold voltage of pipe compensates；
Phase III, the first scanning signal control the first switch transistor, the second switch transistor and the described 6th
Switching transistor is in the conductive state, and the second scanning signal controls the third switching transistor and is in off state, and third is swept
It retouches signal control the 4th switching transistor and the 5th switching transistor is in off state, electric current flows into described shine
Diode, the lumination of light emitting diode.
8. the driving method of pixel circuit according to claim 7, which is characterized in that
It is Vinit+ in the source voltage of the second stage, the driving transistor | Vth |, the grid of the driving transistor
Voltage is Vinit, realizes the compensation of the threshold voltage to the driving transistor, wherein Vinit is the initial voltage, Vth
For the threshold voltage of the driving transistor.
9. the driving method of pixel circuit according to claim 7, which is characterized in that
In the phase III, the second end voltage of the storage capacitance is Vdd, and the first end voltage of the storage capacitance is Va
=Vdata+Vdd- | Vth |-Vinit, the electric current Ids for flowing through the driving transistor is β/2 (Vgs-Vth)2=β/2 (Vdd-
Vdata-Vdd-|Vth|+Vinit+|Vth|)2=β/2 (Vinit-Vdata)2, realize the threshold value electricity to the driving transistor
The compensation of the pressure drop of the compensation and first power supply of pressure；
Wherein, Vdata is the data voltage, and Vdd is the voltage of the first power supply, and Vinit is the initial voltage, and Vth is institute
The threshold voltage of driving transistor is stated, Vgs is to press between the second end of the storage capacitance and the grid of the driving transistor
Difference, β are constant.
10. a kind of display device characterized by comprising pixel circuit described according to claim 1~any one of 6.
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| CN108766355B (en) * | 2018-06-01 | 2020-02-14 | 昆山国显光电有限公司 | Pixel driving circuit, driving method, OLED display panel and device |
| CN111199712A (en) * | 2018-11-16 | 2020-05-26 | 上海和辉光电有限公司 | Pixel compensation circuit and display device |
| US10916198B2 (en) * | 2019-01-11 | 2021-02-09 | Apple Inc. | Electronic display with hybrid in-pixel and external compensation |
| TWI697884B (en) * | 2019-08-20 | 2020-07-01 | 友達光電股份有限公司 | Pixel circuit |
| CN111243526A (en) | 2020-01-19 | 2020-06-05 | 京东方科技集团股份有限公司 | Pixel circuit, display device and driving method |
| US11138924B1 (en) * | 2020-07-03 | 2021-10-05 | Innolux Corporation | Driving circuit for driving a light emitting unit |
| JP2022099010A (en) * | 2020-12-22 | 2022-07-04 | 武漢天馬微電子有限公司 | Display device |
| CN113763888B (en) * | 2021-09-13 | 2022-09-16 | 厦门天马显示科技有限公司 | Display panel and display device |
| CN114530133B (en) * | 2022-03-04 | 2023-07-25 | 广州华星光电半导体显示技术有限公司 | Display panel and display terminal |
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