CN108053792A - 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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- CN108053792A CN108053792A CN201810054566.0A CN201810054566A CN108053792A CN 108053792 A CN108053792 A CN 108053792A CN 201810054566 A CN201810054566 A CN 201810054566A CN 108053792 A CN108053792 A CN 108053792A
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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
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- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
This application discloses a kind of pixel circuit and its driving method, display device, including light emitting diode, storage capacitance, driving transistor, first switch transistor, second switch transistor, the 3rd 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 connected with source electrode, it is formed from the second end of storage capacitance and flows through driving transistor, 3rd switching transistor, 4th switching transistor is to initial voltage signal line, the grid for making driving transistor is identical with the voltage of drain electrode, the source voltage of driving transistor is consistent with the voltage of the second end of storage capacitance, and the second terminal voltage of storage capacitance includes drive transistor threshold voltage, so that threshold voltage is included in the gate source voltage of driving transistor, and then in the glow phase of pixel circuit, the electric current for flowing through light emitting diode is unrelated with drive transistor threshold voltage, so as to fulfill the compensation to drive transistor threshold voltage.
Description
Technical field
This application involves display technology field more particularly to a kind of pixel circuit and its driving method, display devices.
Background technology
Active-matrix organic light-emitting display device (AMOLED) drives Organic Light Emitting Diode.Active-matrix organic display fills
Put multiple pixels including being arranged in the infall between scan line and data cable.In addition, each pixel includes organic light emission two
Pole pipe and the pixel circuit for driving Organic Light Emitting Diode.Pixel circuit is usually by multiple switch transistor, driving crystal
Pipe and storage composition.
Threshold voltage due to the problems such as uniformity, causing transistor made of transistor technology is uneven, so as to influence
The display effect of panel.Moreover, as AMOLED panel becomes large-sized, power supply cabling problem of pressure drop becomes to be particularly acute, and then
Influence the display effect of display panel.
The content 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
Due to the problems such as uniformity, causing the non-uniform problem of threshold voltage of transistor made of transistor technology.
The embodiment of the present application uses following technical proposals：
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, the 3rd 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
Two ends connect, and the source electrode of the first switch transistor is connected with the first power supply；
The grid of the driving transistor switchs crystal with the drain electrode of the second switch transistor and the described 3rd respectively
The source electrode connection of pipe, the source electrode of the second switch transistor switch respectively with the first end of the storage capacitance and the described 5th
The source electrode connection of transistor, the drain electrode of the 5th switching transistor are connected with data cable；
The drain electrode of the driving transistor respectively with the draining of the 3rd 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 connected with the light emitting diode, and the light emitting diode connects with second source
It connects.
Further, the voltage of the initial voltage signal is less 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 during lumination of light emitting diode.
Further, the initial voltage signal line provides initial voltage signal, and the initial voltage signal is negative voltage,
It is initialized for the grid to the driving transistor and drain electrode, the anode of the light emitting diode.
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 connected 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 conduction state, the light-emitting diodes
Pipe shines；
The grid of 3rd switching transistor is connected with the second scan line, the second scanning that second scan line provides
When signal controls the 3rd switching transistor in the conduction 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 connected with three scan line, institute
The 3rd scanning signal for stating three scan line offer controls the 4th switching transistor and the 5th switching transistor to be in
During conducting state, grid and drain electrode, the anode of the light emitting diode to the driving transistor initialize.
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 cable provides data voltage signal, and the data voltage signal passes through the described 5th switch
Transistor applies voltage to the first end of the storage capacitance, and the grid of the driving transistor is all mutually with the voltage to drain
Vinit, the second end of the storage capacitance carry out being discharged to voltage Vinit+ | Vth |, realize to the driving transistor threshold value
The compensation of voltage, wherein, Vinit is the initial voltage, and Vth is the threshold voltage of the driving transistor.
Further, supply voltage is applied 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 all mutually 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 method of the pixel circuit, including：
First stage, the first scanning signal control the first switch transistor, the second switch transistor and described
6th switching transistor is in the conduction state, and the second scanning signal controls the 3rd switching transistor to be in cut-off state, the
Three scanning signals control the 4th switching transistor and the 5th switching transistor in the conduction state, initial voltage signal
Grid and drain electrode, the anode of light emitting diode to the first film transistor initialize；
Second stage, the first scanning signal control the first switch transistor, the second switch transistor and described
6th switching transistor is in cut-off state, and the second scanning signal controls the 3rd switching transistor in the conduction state, the
Three scanning signals control the 4th switching transistor and the 5th switching transistor in the conduction 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 conduction state, and the second scanning signal controls the 3rd switching transistor to be in cut-off state, the
Three scanning signals control the 4th switching transistor and the 5th switching transistor be in cut-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 terminal voltage of the storage capacitance is Vdd, the storage capacitance
First terminal voltage is Va=Vdata+Vdd- | Vth |-Vinit, the electric current Ids for flowing through the driving transistor are 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 threshold voltage of transistor and the compensation of the pressure drop of first power supply；
Wherein, Vdata be the data voltage, Vdd be the first power supply voltage, Vinit be the initial voltage, Vth
For the threshold voltage of the driving transistor, Vgs be second end and the driving transistor of the storage capacitance 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.
Above-mentioned at least one technical solution that the embodiment of the present application uses can reach following advantageous effect：
Pixel circuit provided by the embodiments of the present application, in the compensated stage of pixel circuit, the grid of driving transistor and source
Pole connects, and is formed from the second end of storage capacitance and flows through driving transistor, the 3rd switching transistor, the 4th switching transistor to first
Beginning voltage signal line so that the grid of driving transistor is identical with the voltage of drain electrode, the source voltage of driving transistor and storage
The voltage of the second end of capacitance is consistent, and the voltage of the second end of storage capacitance includes the threshold voltage of driving transistor, so as to
Make the threshold voltage for including driving transistor in the gate source voltage of driving transistor, so that in the luminous rank of pixel circuit
Section, it is unrelated with the threshold voltage of driving transistor to flow through the electric current of light emitting diode, so as to fulfill to driving transistor threshold value electricity
The compensation of pressure.
In addition, in the glow phase of pixel circuit, flow through the electric current of light emitting diode and be applied to the source of driving transistor
The voltage of first power supply of pole is unrelated, it is achieved thereby that the compensation of the pressure drop of the first power supply.
Description of the drawings
Attached drawing described herein is used for providing further understanding of the present application, forms the part of the application, this Shen
Schematic description and description please does not form the improper restriction to the application for explaining the application.In the accompanying drawings：
Fig. 1 is a kind of structure diagram of pixel circuit provided by the embodiments of the present application；
Fig. 2 is a kind of sequence diagram of the driving method of pixel circuit provided by the embodiments of the present application.
Specific embodiment
To make the purpose, technical scheme and advantage 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
Go out all other embodiments obtained under the premise of creative work, shall fall in the protection scope of this application.
Fig. 1 is the structure diagram of pixel circuit provided by the embodiments of the present application.As shown in Figure 1, the embodiment of the present application carries
The pixel circuit of confession can include：Light emitting diode D1, storage capacitance C, driving transistor T, first switch transistor T1, second
Switching transistor T2, the 3rd 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, driving transistor T, first switch transistor T1, second switch transistor
T2, the 3rd 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：
Second end of the source electrode of driving transistor T respectively with the drain electrode of first switch transistor T1 and storage capacitance C is connected,
The source electrode of first switch transistor T1 is connected with the first power supply Vdd.
The grid of driving transistor T respectively with the drain electrode of second switch transistor T2 and the source electrode of the 3rd switching transistor T3
Connection, the source electrode of second switch transistor T2 connect respectively with the source electrode of the first end of storage capacitance C and the 5th switching transistor T5
It connects, the drain electrode of the 5th switching transistor T5 is connected with data cable.
Driving transistor T drain electrode respectively with the drain electrode of the 3rd switching transistor T3, the source electrode of the 4th switching transistor T4
And the 6th switching transistor T6 source electrode connection, the drain electrode of the 4th switching transistor T4 is connected with initial voltage signal line；6th
The drain electrode of switching transistor T6 is connected with light emitting diode D1, and light emitting diode D1 is connected with second source Vss.
In the embodiment of the present application, the first power supply Vdd can be high level voltage, and for being provided for driving transistor T
Supply voltage, driving transistor T, can be with output currents under the action of the first power supply Vdd, which flows into light emitting diode
D1 so that light emitting diode D1 shines, and when light emitting diode D1 shines, which flows into second source Vss, second source
Vss can be low level voltage.
The data cable for providing data voltage Vdata, for providing initial voltage believe by the initial voltage signal line
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
Pole and drain electrode, the anode of light emitting diode D1 are 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 3rd scanning signal that three 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 connected with the first scan line, the first scanning signal Em that the first scan line provides is used to control first switch transistor T1, second
Switching transistor T2 and the 6th switching transistor T6 is in the conduction state or cut-off state.In the embodiment of the present application, swept first
It is in the conduction state to retouch signal Em control first switch transistors T1, second switch transistor T2 and the 6th switching transistor T6
When, light emitting diode D1 shines.
The grid of 3rd switching transistor T3 is connected with the second scan line, the second scanning signal Sn that the second scan line provides
For controlling, the 3rd switching transistor T3 is in the conduction state or cut-off state.In the embodiment of the present application, in the second scanning signal
When Sn controls the 3rd switching transistor T3 in the conduction 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 connected with three scan line, and the 3rd sweeps
The 3rd scanning signal Sn-1 of line offer is retouched for the 4th switching transistor T4 and the 5th switching transistor T5 to be controlled to be on
State or cut-off state.In the embodiment of the present application, opened in the 3rd scanning signal Sn-1 controls the 4th switching transistor T4 and the 5th
When pass transistor T5 is in the conduction state, the anode of grid and source electrode, light emitting diode D1 to driving transistor T carries out initially
Change.
Pixel circuit provided by the embodiments of the present application compared to existing technologies, can be realized to driving transistor
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
It is all mutually 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, so that in the glow phase of pixel circuit, stream
Electric current Ids through light emitting diode is：β/2(Vgs-Vth)2, and then realize the benefit to the threshold voltage of 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 glow phase of pixel circuit, flowing through the expression formula of the electric current Ids of light emitting diode can be：
Ids=β/2 (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 of driving transistor T, and β is constant.
It was found from above formula, the electricity of the electric current for flowing through light emitting diode and the first power supply of the source electrode for being applied to driving transistor
Press it is unrelated, it is achieved thereby that the compensation of the pressure drop of the first power supply.
Fig. 2 is a kind of sequence diagram of the driving method of pixel circuit provided by the embodiments of the present application, and the sequence diagram corresponds to
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 sequence diagram shown in Fig. 2 can 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 conduction state or cut-off state, Sn carries for the second scan line
The second scanning signal supplied, can be used for controlling the 3rd switching transistor T3 shown in FIG. 1 in the conduction state or cut-off state,
Sn-1 is the 3rd scanning signal that provides of three 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 conduction state or cut-off state, Vdata are the data voltage that data cable provides, and Vinit is initial
The initial voltage that voltage signal line provides.
The driving method of the corresponding pixel circuit of sequence 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 conduction state, and the second scanning signal Sn controls the 3rd switching transistor T3 to be in cut-off state, and the 3rd
Scanning signal Sn-1 controls the 4th switching transistor T4 and the 5th switching transistor T5 is in the conduction state, and initial voltage signal will
The grid voltage of driving transistor drag down dragged down with drain voltage, the anode voltage of light emitting diode D1 drags down, so as to fulfill right
The grid of driving transistor and drain electrode, the anode of light emitting diode D1 are 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 cut-off state, and the second scanning signal Sn controls the 3rd switching transistor T3 in the conduction state, and the 3rd
Scanning signal Sn-1 controls the 4th switching transistor T4 and the 5th switching transistor T5 is in the conduction 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 conduction state, and the second scanning signal Sn controls the 3rd switching transistor T3 to be in cut-off state, and the 3rd
Scanning signal Sn-1 controls the 4th switching transistor T4 and the 5th switching transistor T5 is in cut-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 the 3rd scanning signal Sn-1 is
Low level, therefore, first switch transistor T1 are in the conduction state, at second switch transistor T2 and the 5th switching transistor T5
In conducting state, the 4th switching transistor T4 and the 6th switching transistor T6 are in the conduction state, at the 3rd switching transistor T3
In cut-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, so as to fulfill 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 grid voltage of driving transistor T and drain voltage, the anode voltage of light emitting diode D1,
The grid of driving transistor T and drain electrode, the anode of light emitting diode D1 are initialized so as to realize.
It should be noted that since light emitting diode D1 has capacity effect, there is certain voltage, in the first stage t1
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
Glow 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 the 3rd 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, the 3rd 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 cut-off state, and the 3rd switching transistor T3 becomes conducting state from cut-off state, the 4th switching transistor T4 and
5th switching transistor T5 is still in conducting state.
At this point, data voltage Vdata is applied voltages to by the first end of the 5th from switching transistor T5 to storage capacitance C
Vdata, the source electrode of driving transistor T are connected with grid, and the grid of driving transistor T is identical with the voltage to drain, rapidly goes to
Vinit, the second end of storage capacitance C are discharged, and voltage Vinit+ is down to by voltage Vdd | Vth |, in this manner it is achieved that right
The compensation of driving transistor T threshold voltage, wherein, Vth is the threshold voltage of driving transistor T.
For first stage t2 to the transition stage t23 of second stage t3：
3rd 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 nodes in such as Fig. 1) of storage capacitance C is maintained spaced apart by with the external world, a at storage capacitance C both ends
Voltage between node and b nodes remains unchanged, i.e. Va-Vb=Vdata-Vinit- | Vth |.
For phase III t3：
Since the first scanning signal Em from high level becomes low level, the second scanning signal Sn and the 3rd scanning signal Sn-1
It remains unchanged, therefore, first switch transistor T1, second switch transistor T2 and the 6th switching transistor T6 are become by cut-off state
For conducting state, the 3rd switching transistor T3 becomes cut-off state, the switches of the 4th switching transistor T4 and the 5th from conducting state
Transistor T5 becomes cut-off state from conducting 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 be expressed as：
Ids=β/2 (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 of driving transistor T, and β is constant.
In the specific implementation, each electrical reference signal pressure can be：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, driving transistor T
Threshold voltage be -1V；If Ids is 658nA, the threshold voltage of driving transistor T is -1.5V；If Ids is 640nA, drive
The threshold voltage of dynamic transistor T is -2V.It understands, during the threshold voltage variation ± 0.5V of driving transistor T, curent change is less than
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 understands, during the voltage Vdd variation ± 0.2V of the first power supply, curent change is less than 5%.
As shown from the above formula, it is unrelated with the threshold voltage of driving transistor T to flow through the electric current of light emitting diode D1, realizes
Compensation to the threshold voltage of driving transistor T.In addition, flow through the electric current of light emitting diode D1 and the voltage of the first power supply 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 can include pixel circuit.Pixel electricity
Road can include：Light emitting diode, storage capacitance, driving transistor, first switch transistor, second switch transistor, the 3rd
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：
Second end of the source electrode of driving transistor respectively with the drain electrode of first switch transistor and storage capacitance is connected, and first
The source electrode of switching transistor is connected with the first power supply.
Source electrode of the grid of driving transistor respectively with the drain electrode of second switch transistor and the 3rd switching transistor is connected,
Source electrode of the source electrode of second switch transistor respectively with the first end of storage capacitance and the 5th switching transistor is connected, the 5th switch
The drain electrode of transistor is connected with data cable.
Driving transistor drain electrode respectively with the drain electrode of the 3rd switching transistor, the source electrode and the 6th of the 4th switching transistor
The source electrode connection of switching transistor, the drain electrode of the 4th switching transistor are connected with initial voltage signal line；6th switching transistor
Drain electrode be connected with light emitting diode, light emitting diode is connected 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 connected 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 conduction state, lumination of light emitting diode；
The grid of 3rd switching transistor is connected with the second scan line, the second scanning signal control that the second scan line provides
When 3rd switching transistor is in the conduction state, the threshold voltage of driving transistor is compensated；
The grid of 4th switching transistor and the grid of the 5th switching transistor are connected with three scan line, three scan line
When the 3rd scanning signal provided controls the 4th switching transistor and the 5th switching transistor in the conduction state, to driving crystal
The grid of pipe and drain electrode, the anode of 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 the 3rd scanning signal and is sequentially fed to the first scan line, the second scan line and the 3rd scanning
Line.Data-signal is fed to data cable by data driver, the data driver.
In the embodiment of the present application, the technique effect for implementing and its reaching of pixel circuit is 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, skill in the art
Art personnel once know basic creative concept, then other change and modification can be made to these embodiments.It is so appended
Claim is intended to be construed to include preferred embodiment and falls into all change and modification of the application scope.
Obviously, those skilled in the art can carry out the application model of the various modification and variations without departing from the application
It encloses.In this way, if these modifications and variations of the application belong within the scope of the application claim and its equivalent technologies, then
The application is also intended to comprising including these modification and variations.
Claims (10)
1. a kind of pixel circuit, which is characterized in that including：Light emitting diode, storage capacitance, driving transistor, first switch are brilliant
Body pipe, second switch transistor, the 3rd switching transistor, the 4th switching transistor, the 5th switching transistor, the 6th switch crystal
Pipe, wherein,
The source electrode of the driving transistor respectively with the drain electrode of the first switch transistor and the second end of the storage capacitance
Connection, the source electrode of the first switch transistor are connected with the first power supply；
The grid of the driving transistor respectively with the drain electrode of the second switch transistor and the 3rd switching transistor
Source electrode connects, and the source electrode of the second switch transistor switchs crystal with the first end of the storage capacitance and the described 5th respectively
The source electrode connection of pipe, the drain electrode of the 5th switching transistor are connected with data cable；
The drain electrode of the driving transistor respectively with the draining of the 3rd switching transistor, the source of the 4th switching transistor
The source electrode of pole and the 6th switching transistor connects, and drain electrode and the initial voltage signal line of the 4th switching transistor connect
It connects；The drain electrode of 6th switching transistor is connected with the light emitting diode, and the light emitting diode is connected 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 and drain electrode, the anode of the light emitting diode of dynamic transistor are initialized.
3. pixel circuit according to claim 2, which is characterized in that the voltage of the initial voltage signal is less 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 connected 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 conduction state, the lumination of light emitting diode；
The grid of 3rd switching transistor is connected with the second scan line, the second scanning signal that second scan line provides
When controlling the 3rd switching transistor in the conduction 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 connected with three scan line, and described
The 3rd scanning signal that three scan line provides controls the 4th switching transistor and the 5th switching transistor to be on
During state, grid and drain electrode, the anode of the light emitting diode to the driving transistor initialize.
5. pixel circuit according to any one of claims 1 to 4, which is characterized in that
The data cable provides data voltage signal, and the data voltage signal is deposited by the 5th switching transistor to described
The first end that storing up electricity is held applies voltage, and the grid of the driving transistor is all mutually Vinit with the voltage to drain, 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 all mutually 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. a kind of driving method according to pixel circuit according to any one of claims 1 to 6, which is characterized in that including：
First stage, the first scanning signal control the first switch transistor, the second switch transistor and the described 6th
Switching transistor is in the conduction state, and the second scanning signal controls the 3rd switching transistor to be in cut-off state, and the 3rd sweeps
It retouches signal control the 4th switching transistor and the 5th switching transistor is in the conduction state, initial voltage signal is to institute
The grid and drain electrode, the anode of light emitting diode for stating first film transistor are initialized；
Second stage, the first scanning signal control the first switch transistor, the second switch transistor and the described 6th
Switching transistor is in cut-off state, and the second scanning signal control the 3rd switching transistor is in the conduction state, and the 3rd sweeps
Retouching signal controls the 4th switching transistor and the 5th switching transistor in the conduction 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 conduction state, and the second scanning signal controls the 3rd switching transistor to be in cut-off state, and the 3rd sweeps
Retouching signal controls the 4th switching transistor and the 5th switching transistor to be in cut-off state, and 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
In the second stage, the source voltage of the driving transistor is Vinit+ | Vth |, the grid of the driving transistor
Voltage is Vinit, realizes the compensation of the threshold voltage to the driving transistor, wherein, Vinit be 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 terminal voltage of the storage capacitance is Vdd, and the first terminal voltage of the storage capacitance is Va
=Vdata+Vdd- | Vth |-Vinit, the electric current Ids for flowing through the driving transistor are 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 pressure and the compensation of the pressure drop of first power supply；
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 be pressed 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, which is characterized in that including：According to pixel circuit according to any one of claims 1 to 6.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108766355A (en) * | 2018-06-01 | 2018-11-06 | 昆山国显光电有限公司 | The pixel-driving circuit and method of driving, 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 |
| 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 |
| CN111435587A (en) * | 2019-01-11 | 2020-07-21 | 苹果公司 | Electronic display with hybrid in-pixel and external compensation |
| CN111754924A (en) * | 2019-08-20 | 2020-10-09 | 友达光电股份有限公司 | Pixel circuit |
| CN113763888A (en) * | 2021-09-13 | 2021-12-07 | 厦门天马显示科技有限公司 | Display panel and display device |
| CN113889026A (en) * | 2020-07-03 | 2022-01-04 | 群创光电股份有限公司 | Drive circuit for driving light emitting unit |
| CN114530133A (en) * | 2022-03-04 | 2022-05-24 | 广州华星光电半导体显示技术有限公司 | Display panel and display terminal |
| CN114550655A (en) * | 2020-12-22 | 2022-05-27 | 武汉天马微电子有限公司 | Display device |
| CN115101012A (en) * | 2022-07-06 | 2022-09-23 | 北京欧铼德微电子技术有限公司 | Pixel compensation circuit, system and method |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120105410A1 (en) * | 2010-10-28 | 2012-05-03 | Sang-Moo Choi | Pixel and organic light emitting display using the same |
| CN102915703A (en) * | 2012-10-30 | 2013-02-06 | 北京大学 | Pixel driving circuit and driving method thereof |
| CN103996376A (en) * | 2014-05-14 | 2014-08-20 | 京东方科技集团股份有限公司 | Pixel driving circuit and method, array substrate and display device |
| CN203882588U (en) * | 2014-06-13 | 2014-10-15 | 京东方科技集团股份有限公司 | Pixel drive circuit, array substrate and display device |
| CN204029330U (en) * | 2014-07-22 | 2014-12-17 | 京东方科技集团股份有限公司 | Pixel-driving circuit, array base palte and display device |
| CN104282265A (en) * | 2014-09-26 | 2015-01-14 | 京东方科技集团股份有限公司 | Pixel circuit, drive method thereof, an organic light-emitting display panel and display device |
| CN104680980A (en) * | 2015-03-25 | 2015-06-03 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method thereof and display device |
| CN105575320A (en) * | 2014-10-15 | 2016-05-11 | 昆山工研院新型平板显示技术中心有限公司 | Pixel circuit and driving method thereof, and organic light-emitting display |
| US20160232840A1 (en) * | 2015-02-05 | 2016-08-11 | Innolux Corporation | Oled display panel with threshold voltage compensation and driving method thereof |
| CN106935201A (en) * | 2015-12-31 | 2017-07-07 | 昆山国显光电有限公司 | Image element circuit and its driving method and active matrix/organic light emitting display |
-
2018
- 2018-01-19 CN CN201810054566.0A patent/CN108053792B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120105410A1 (en) * | 2010-10-28 | 2012-05-03 | Sang-Moo Choi | Pixel and organic light emitting display using the same |
| CN102915703A (en) * | 2012-10-30 | 2013-02-06 | 北京大学 | Pixel driving circuit and driving method thereof |
| CN103996376A (en) * | 2014-05-14 | 2014-08-20 | 京东方科技集团股份有限公司 | Pixel driving circuit and method, array substrate and display device |
| CN203882588U (en) * | 2014-06-13 | 2014-10-15 | 京东方科技集团股份有限公司 | Pixel drive circuit, array substrate and display device |
| CN204029330U (en) * | 2014-07-22 | 2014-12-17 | 京东方科技集团股份有限公司 | Pixel-driving circuit, array base palte and display device |
| CN104282265A (en) * | 2014-09-26 | 2015-01-14 | 京东方科技集团股份有限公司 | Pixel circuit, drive method thereof, an organic light-emitting display panel and display device |
| CN105575320A (en) * | 2014-10-15 | 2016-05-11 | 昆山工研院新型平板显示技术中心有限公司 | Pixel circuit and driving method thereof, and organic light-emitting display |
| US20160232840A1 (en) * | 2015-02-05 | 2016-08-11 | Innolux Corporation | Oled display panel with threshold voltage compensation and driving method thereof |
| CN104680980A (en) * | 2015-03-25 | 2015-06-03 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method thereof and display device |
| CN106935201A (en) * | 2015-12-31 | 2017-07-07 | 昆山国显光电有限公司 | Image element circuit and its driving method and active matrix/organic light emitting display |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108766355A (en) * | 2018-06-01 | 2018-11-06 | 昆山国显光电有限公司 | The pixel-driving circuit and method of driving, 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 |
| US11651736B2 (en) | 2019-01-11 | 2023-05-16 | Apple Inc. | Electronic display with hybrid in-pixel and external compensation |
| CN111435587B (en) * | 2019-01-11 | 2024-04-16 | 苹果公司 | Electronic display with hybrid in-pixel and out-of-pixel compensation |
| CN111435587A (en) * | 2019-01-11 | 2020-07-21 | 苹果公司 | Electronic display with hybrid in-pixel and external compensation |
| US11887546B2 (en) | 2019-01-11 | 2024-01-30 | Apple Inc. | Electronic display with hybrid in-pixel and external compensation |
| CN111754924A (en) * | 2019-08-20 | 2020-10-09 | 友达光电股份有限公司 | Pixel circuit |
| US11830427B2 (en) | 2020-01-19 | 2023-11-28 | Ordos Yuansheng Optoelectronics Co., Ltd. | Pixel circuit, display apparatus and driving method |
| WO2021143930A1 (en) * | 2020-01-19 | 2021-07-22 | 京东方科技集团股份有限公司 | Pixel circuit, display apparatus and driving method |
| 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 |
| CN113889026A (en) * | 2020-07-03 | 2022-01-04 | 群创光电股份有限公司 | Drive circuit for driving light emitting unit |
| CN114550655A (en) * | 2020-12-22 | 2022-05-27 | 武汉天马微电子有限公司 | Display device |
| CN114550655B (en) * | 2020-12-22 | 2023-03-14 | 武汉天马微电子有限公司 | Display device |
| CN113763888A (en) * | 2021-09-13 | 2021-12-07 | 厦门天马显示科技有限公司 | Display panel and display device |
| CN114530133A (en) * | 2022-03-04 | 2022-05-24 | 广州华星光电半导体显示技术有限公司 | Display panel and display terminal |
| 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 |
| CN115101012A (en) * | 2022-07-06 | 2022-09-23 | 北京欧铼德微电子技术有限公司 | Pixel compensation circuit, system and method |
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