CN207425322U - Pixel circuit, display base plate and display device - Google Patents
Pixel circuit, display base plate and display device Download PDFInfo
- Publication number
- CN207425322U CN207425322U CN201721105788.8U CN201721105788U CN207425322U CN 207425322 U CN207425322 U CN 207425322U CN 201721105788 U CN201721105788 U CN 201721105788U CN 207425322 U CN207425322 U CN 207425322U
- Authority
- CN
- China
- Prior art keywords
- module
- transistor
- electrically connected
- pole
- signal end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The embodiment of the utility model provides a kind of pixel circuit, display base plate and display device, is related to display technology field, can improve short-term image retention problem.Pixel circuit includes：Driving resets module, under the control at the first reset signal end, by the grid of control source driving transistor into drive module at the first initial voltage end；Compensating module is write, under the control at scanning signal end, the shadow stage to input the reference voltage that data voltage end exports to drive module disappearing, and makes driving transistor in the conduction state；Data voltage is inputted to drive module in write-in compensated stage, and drive module is compensated；It shines and resets module, under the control at scanning signal end, control source to the luminescent device at the first initial voltage end to be reset；Shine enabled module, under the control at enable signal end, the voltage of the first power voltage terminal being provided to drive module, and drive module is made to be connected with luminescent device.
Description
Technical field
The utility model is related to a kind of display technology field more particularly to pixel circuit, display base plate and display devices.
Background technology
Organic electroluminescent LED (Organic Light Emitting Diode, OLED) display is to study at present
One of the hot spot in field is compared with liquid crystal display (Liquid Crystal Display, LCD), and OLED has low energy consumption, life
The advantages that producing at low cost, self-luminous, fast wide viewing angle and corresponding speed.
Analysis shows, above-mentioned short-term afterimage phenomena are related with the hysteresis effect of driving transistor in OLED display.The magnetic
As shown in Figure 1, wherein, Fig. 1 chain lines are when showing maximum gray in OLED display in sub-pixel for process that residual effect is answered
When the source-drain voltage of driving transistor is Vds1, the electric current Ids of the driving transistor and the characteristic curve of gate source voltage (Vgs)；
When the source-drain voltage of driving transistor when dotted line is display minimum gray in sub-pixel is Vds3, the electric current of driving transistor
The characteristic curve of Ids and Vgs；Solid line is that the source-drain voltage of the driving transistor in sub-pixel when showing intermediate grey menu is
During Vds2, the electric current of driving transistor and the characteristic curve of Vgs.
When maximum gray switches to intermediate grey menu, driving current Ids when showing maximum gray in sub-pixel is needed
Reduce, therefore the semiconductor layer of driving transistor and gate insulator layer interface need to carry out charge release (Hole in the sub-pixel
Detrapping), by A1 points to A2 points, Vgs values are V_g by V_w variations at this time；When switching to grey menu from minimum gray
When, the driving current Ids of driving transistor needs to increase in sub-pixel when showing minimum gray, therefore TFT in the sub-pixel
Semiconductor layer and gate insulator layer interface need to carry out charge-trapping (Hole Trapping), by A3 points to A4 points, Vgs values at this time
It is V_g by V_b variations.It can thus be seen that since electric charge capture is different with the path of voltage change during release, edge
Corresponding driving current Ids is different with A4 points for the A2 points of different paths arrival voltage V_g, hence being turned by maximum gray
Shift to grey menu sub-pixel and by minimum gray convert between the sub-pixel of grey menu there are luminance difference, so as to occur
Short-term afterimage phenomena.After placing a period of time, above-mentioned A2 points and A4 points reach B points, and image retention disappears.
Utility model content
The embodiment of the utility model provides a kind of pixel circuit, display base plate and display device, can improve short-term image retention
Problem.
In order to achieve the above objectives, the embodiment of the utility model adopts the following technical scheme that：
In a first aspect, a kind of pixel circuit is provided, including：Driving resets module, write-in compensating module, shining resets mould
Block, shine enabled module, drive module and luminescent device；The drive module includes driving transistor, the driving transistor
The first pole be connected with said write compensating module；The driving resets module, at the beginning of connecting the first reset signal end, first respectively
Beginning voltage end and drive module, under the control at the first reset signal end, the first initial voltage end to be provided
Control source to the grid of driving transistor described in the drive module, drive module is reset；Write-in compensation mould
Block connects scanning signal end, data voltage end and the drive module respectively, under the control at the scanning signal end,
In the shadow stage that disappears, the reference voltage that the data voltage end exports is inputted to the drive module, makes the driving transistor
Disappearing, the shadow stage is in the conduction state；In write-in compensated stage, the data voltage that the data voltage end exports is inputted to institute
Drive module is stated, and compensation data is carried out to the drive module；Shine reset module, connect respectively the scanning signal end,
The first initial voltage end and the anode of the luminescent device, under the control at the scanning signal end, by described
The control source that one initial voltage end provides resets the luminescent device to the luminescent device；The luminescent device
Cathode connection second source voltage end；Shine enabled module, connects enable signal end, the first power voltage terminal, described respectively
Drive module and the luminescent device, under the control at the enable signal end, by the electricity of first power voltage terminal
Pressure is provided to the drive module, and the drive module is made to be connected with the luminescent device；The driving transistor, for
The luminescent device provides driving current.
Optionally, the drive module is also connected with first power voltage terminal；The drive module further includes storage
Capacitance；The grid of the driving transistor resets module and said write compensating module with the driving and be electrically connected, the first pole with
Second is extremely electrically connected with the luminous enabled module and said write compensating module；One end of the storage capacitance and the drive
The grid electrical connection of dynamic transistor, the other end are electrically connected with first power voltage terminal.
Optionally, the driving, which resets module, includes the first transistor；The grid of the first transistor and described first
Reset signal end is electrically connected, and the first pole is electrically connected with the grid of the driving transistor, the second pole and first initial voltage
End electrical connection.
Optionally, said write compensating module includes second transistor and third transistor；The grid of the second transistor
Pole is electrically connected with the scanning signal end, and the first pole is electrically connected with the grid of the driving transistor, the second pole and the driving
The second pole electrical connection of transistor；The grid of the third transistor is electrically connected with the scanning signal end, the first pole with it is described
Data voltage end is electrically connected, and the second pole is electrically connected with the first pole of the driving transistor.
Optionally, the luminous replacement module includes the 4th transistor；The grid of 4th transistor and the scanning
Signal end is electrically connected, and the first pole is electrically connected with the first initial voltage end, and the second pole is electrically connected with the luminescent device.
Optionally, the enabled module that shines includes the 5th transistor and the 6th transistor；The grid of 5th transistor
Pole is electrically connected with the enable signal end, and the first pole is electrically connected with first power voltage terminal, and the second pole and the driving are brilliant
The first pole electrical connection of body pipe；The grid of 6th transistor is electrically connected with the enable signal end, the first pole and the drive
The second pole electrical connection of dynamic transistor, the second pole is electrically connected with the luminescent device.
Optionally, the luminescent device includes light emitting diode；The anode of the light emitting diode is enabled with described shine
Module and the luminous replacement module electrical connection, cathode are electrically connected with the second source voltage end.
Second aspect provides a kind of display base plate, and including the sub-pixel that array is set, each sub-pixel includes upper
State the pixel circuit described in first aspect.
Optionally, the scanning signal end of pixel circuit described in a line sub-pixel is connected with a grid line；The display
Substrate further includes multiple switch module, and a switch module is connected with a grid line, and all switch modules are equal
It is connected with the second reset signal end and the second initial voltage end；The switch module is used for the control at the second reset signal end
Under system, by the control source that the second initial voltage end provides to the grid line, so that write-in compensating module is in the shadow stage that disappears
The data voltage that data voltage end exports is inputted to drive module.
Further, the switch module includes the 7th transistor；The grid of 7th transistor and second weight
Signal end electrical connection is put, the first pole is electrically connected with the grid line, and the second pole is electrically connected with the second initial voltage end.
The third aspect provides a kind of display device, including the display base plate described in second aspect.
The embodiment of the utility model provides a kind of pixel circuit, display base plate and display device, and mould is compensated by writing
The data voltage that data voltage end exports is inputted the driving transistor into drive module by block in write-in compensated stage, and to driving
Dynamic transistor carries out compensation data, can make driving transistor when luminescent device is driven to shine, flow through the electric current of luminescent device with
The threshold voltage of driving transistor is unrelated, so as to eliminate influence of the threshold voltage to luminosity, improves display homogeneity.
In addition, in the shadow stage that disappears, by the grid by the control source that the first initial voltage end provides to driving transistor, meanwhile, it will
The reference voltage of data voltage end output is inputted, and to the first pole of driving transistor, the Vgs of all driving transistors can carry out
It resets simultaneously, makes driving transistor (ON-Bias) in the conduction state, i.e. the capture of the charge of all driving transistors at this time
State is identical, and therefore, no matter the data voltage of former frame, driving transistor all carries out data voltage write-in by same state
And threshold voltage compensation, so as to improve the short-term image retention problem generated by hysteresis effect.
Description of the drawings
It in order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of schematic diagram for hysteresis effect that the prior art provides；
Fig. 2 is a kind of structure diagram of pixel circuit provided by the utility model；
Fig. 3 is a kind of schematic diagram based on hysteresis effect provided by the utility model；
Fig. 4 is a kind of concrete structure schematic diagram of the modules of pixel circuit shown in Fig. 2；
Fig. 5 a- Fig. 5 d are equivalent circuit diagram when pixel circuit shown in Fig. 4 corresponds to different situations；
Fig. 6 is a kind of schematic diagram one of display base plate provided by the utility model；
Fig. 7 is a kind of schematic diagram two of display base plate provided by the utility model；
Fig. 8 is a kind of driving method flow diagram one for driving display base plate provided by the utility model；
The sequence diagram one for each signal that Fig. 9 is used when being driving pixel circuit；
Figure 10 is a kind of driving method flow diagram two for driving display base plate provided by the utility model；
The sequence diagram two for each signal that Figure 11 is used when being driving pixel circuit.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work
All other embodiments obtained shall fall within the protection scope of the present invention.
The utility model embodiment provides a kind of pixel circuit, as shown in Fig. 2, including：Driving resets module 10, write-in is mended
Repay module 20, shining resets module 30, luminous enabled module 40, drive module 50 and luminescent device L；Drive module 50 includes driving
The first pole of dynamic transistor Td (as shown in Figure 4), driving transistor Td are connected with write-in compensating module 20.
Specifically, driving resets module 10, the first reset signal end RST1, the first initial voltage end V are connected respectivelyint1With
Drive module 50, under the control of the first reset signal end RST1, by the first initial voltage end Vint1The voltage of offer is defeated
Enter to drive module 50, drive module 50 is reset.
Compensating module 20 is write, scanning signal end S, data voltage end D and drive module 50 are connected respectively, for scanning
Under the control of signal end S, in the shadow stage that disappears, the D reference voltages exported in data voltage end are inputted to drive module 50, make driving
Transistor Td is in the conduction state in the shadow stage that disappears；In write-in compensated stage, the data voltage of data voltage end D outputs is inputted
Compensation data is carried out to drive module 50, and to drive module 50.
It shines and resets module 30, connect scanning signal end S, the first initial voltage end V respectivelyint1With the sun of luminescent device L
Pole, under the control of scanning signal end S, by the first initial voltage end Vint1The control source of offer is right to luminescent device L
Luminescent device L is reset；The cathode connection second source voltage end ELVSS of luminescent device L.
Shine enabled module 40, connects enable signal end EM, the first power voltage terminal ELVDD, 50 and of drive module respectively
Luminescent device L, under the control of enable signal end EM, the voltage of the first power voltage terminal ELVDD to be provided to driving mould
Block 50, and drive module 50 is made to be connected with luminescent device L.
Driving transistor Td, for providing driving current to luminescent device L.
Wherein, by taking p-type driving transistor Td as an example, the first extremely source electrode, second extremely drains.
It should be noted that the size of driving transistor Td is bigger, there is certain driving force, therefore, driving is brilliant
Body pipe Td can provide driving current under the action of the first power voltage terminal ELVDD output voltages to luminescent device L, with driving
Luminescent device L shines.
It is understood that disappear period of the shadow stage between adjacent image frame, in the period, for eliminating upper one
The afterimage of frame.For any image frame, all pass through the progressive scan from the first row grid line a line grid line to the end,
Thus, last column grid line that the shadow stage that disappears is happened at previous image frame scans through and last column sub-pixel is completed after showing
To next image frame the first row grid line start scanning before.
The utility model embodiment provides a kind of pixel circuit, and compensated stage is being write by number by writing compensating module 20
It is inputted according to the voltage end D data voltages exported to the driving transistor Td in drive module 50, and driving transistor Td is carried out
Compensation data can make driving transistor Td when luminescent device L is driven to shine, and flow through the electric current of luminescent device L and driving crystal
The threshold voltage of pipe Td is unrelated, so as to eliminate influence of the threshold voltage to luminosity, improves display homogeneity.In addition,
In the shadow stage that disappears, by by the first initial voltage end Vint1The control source of offer to driving transistor Td grid, meanwhile, will
The reference voltage of data voltage end D outputs (is denoted as VD) input to the first pole of driving transistor, all driving transistors can be made
The Vgs of Td, which reset simultaneously, (is equal to Vint1-VD), make driving transistor Td (ON-Bias) in the conduction state, i.e. at this time
The trapped state of the charge of all driving transistor Td is identical, therefore, no matter the data voltage of former frame, driving transistor
Td all carries out data voltage write-in and compensation by same state, so as to improve because the short-term image retention that hysteresis effect generates is asked
Topic.
Exemplified by switching to intermediate grey menu by maximum gray picture and minimum gray picture, as shown in figure 3, in the shadow that disappears
During the stage, by making in the pixel circuit of each sub-pixel of display panel, all driving transistor Td are all in conducting shape
State (ON-Bias), the Vgs of driving transistor Td is identical at this time, is respectively positioned on characteristic the top, corresponding electric current Ids phases
With (the A5 points in corresponding diagram 3), and electric current Ids is very big.I.e.：For showing the sub-pixel of maximum gray, by A1 points
A5 points are reached, for showing the sub-pixel of minimum gray, A5 points are reached by A3 points, driving transistor in all sub-pixels
The charge-trapping state of Td is identical.Based on this, when showing next image frame, the electric current of driving transistor in each sub-pixel
Ids needs to reduce, therefore the semiconductor layer of driving transistor Td and gate insulator layer interface are required to carry out electricity in each sub-pixel
Lotus discharges (Hole Detrapping), and the charge release way of each driving transistor Td is identical, so as to improve because of magnetic hysteresis
The short-term image retention problem that effect generates, luminosity can reach the corresponding luminosity of B points, brightness corresponding with actual gray
Unanimously.
As shown in figure 4, drive module 50 is also connected with the first power voltage terminal ELVDD.Wherein, drive module 50 is removed and included
Outside driving transistor Td, storage capacitance C is further includedst。
Wherein, the grid of driving transistor Td resets module 10 with driving and write-in compensating module 20 is electrically connected, the first pole
It is extremely electrically connected with second with shining to enable module 40 and write compensating module 20.
Storage capacitance CstOne end be electrically connected with the grid of driving transistor Td, the other end and the first power voltage terminal
ELVDD is electrically connected.
It should be noted that drive module 50 can also include multiple driving transistor Td in parallel.Above-mentioned is only pair
Drive module 50 for example, other structures identical with 50 function of drive module this is no longer going to repeat them, but all should
When belonging to the scope of protection of the utility model.
As shown in figure 4, driving, which resets module 10, includes the first transistor T1.
The grid of the first transistor T1 is electrically connected with the first reset signal end RST1, the first pole and the grid of driving transistor Td
Pole is electrically connected, the second pole and the first initial voltage end Vint1Electrical connection.
It should be noted that driving, which resets module 10, can also include the multiple switch crystal in parallel with the first transistor T1
Pipe.It is above-mentioned be only driving is reset module 10 for example, other exist with the identical structures of driving replacement 10 function of module
This is no longer repeated one by one, but should all belong to the scope of protection of the utility model.
As shown in figure 4, write-in compensating module 20 includes second transistor T2 and third transistor T3.
The grid of second transistor T2 is electrically connected with scanning signal end S, and the first pole and the grid of driving transistor Td are electrically connected
It connects, the second pole is electrically connected with the second pole of driving transistor Td.
The grid of third transistor T3 is electrically connected with scanning signal end S, and the first pole is electrically connected with data voltage end D, and second
Pole is electrically connected with the first pole of driving transistor Td.
It should be noted that write-in compensating module 20 can also include the multiple switch crystal in parallel with second transistor T2
Pipe, and/or the multiple switch transistor in parallel with third transistor T3.Above-mentioned is only illustrating to write-in compensating module 20
Bright, this is no longer going to repeat them for other structures identical with write-in 20 function of compensating module, but should all belong to the utility model
Protection domain.
Include the 4th transistor T4 as shown in figure 4, shining and resetting module 30.
The grid of 4th transistor T4 is electrically connected with scanning signal end S, the first pole and the first initial voltage end Vint1It is electrically connected
It connects, the second pole is electrically connected with luminescent device L.
Wherein, luminescent device L includes light emitting diode, which can be semiconductor light-emitting-diode or organic
Light emitting diode, the second pole of the 4th transistor T4 are electrically connected with the anode of light emitting diode.
It can also include the multiple switch crystal in parallel with the 4th transistor T4 it should be noted that shining and resetting module 30
Pipe.It is above-mentioned be only to shine reset module 30 for example, other exist with the identical structures of replacement 30 function of module that shine
This is no longer repeated one by one, but should all belong to the scope of protection of the utility model.
As shown in figure 4, the enabled module 40 that shines includes the 5th transistor T5 and the 6th transistor T6.
The grid of 5th transistor T5 is electrically connected with enable signal end EM, the first pole and the first power voltage terminal ELVDD electricity
Connection, the second pole is electrically connected with the first pole of driving transistor Td.
The grid of 6th transistor T6 is electrically connected with enable signal end EM, and the second of the first pole and driving transistor Td is extremely electric
Connection, the second pole is electrically connected with luminescent device L.
That is, when luminescent device L is light emitting diode, the second pole of the 6th transistor T6 and the anode electricity of light emitting diode
Connection.
The cathode of light emitting diode is then electrically connected with second source voltage end ELVSS.Wherein, the first electricity in the utility model
Source voltage end ELVDD exports constant high voltage, and second source voltage end ELVSS exports constant low-voltage.
It should be noted that the enabled module 40 that shines can also include the multiple switch crystal in parallel with the 5th transistor T5
Pipe, and/or the multiple switch transistor in parallel with the 6th transistor T6.Above-mentioned is only illustrating to the enabled module 40 that shines
Bright, this is no longer going to repeat them for other structures identical with 40 function of enabled module that shines, but should all belong to the utility model
Protection domain.
Based on the above-mentioned description to each module physical circuit, in the shadow stage that disappears, as scanning signal end S and the first reset signal
Hold RST1 output low level signals, when enable signal end EM exports high level signal, the equivalent circuit of pixel circuit shown in Fig. 4
As shown in Figure 5 a, the first transistor T1, second transistor T2, third transistor T3 are both turned on figure.
The conducting of the first transistor T1 and second transistor T2 so that the first initial voltage end Vint1Control source to drive
The grid of dynamic transistor Td and the second pole；The conducting of third transistor T3 so that reference voltage (this of data voltage end D outputs
When voltage be denoted as VD) input is to the first pole of driving transistor, so that the Vgs=V of driving transistor Tdint1-VD, driving
Transistor Td (ON-Bias) in the conduction state, in this way, make in the pixel circuit of each sub-pixel of display panel, it is all
Driving transistor Td is all in conducting state, no matter the data voltage of former frame, driving transistor Td is all by same state
Data voltage write-in and threshold voltage compensation are carried out, so as to improve the short-term image retention problem generated by hysteresis effect.
The utility model embodiment also provides a kind of display base plate, as shown in fig. 6, including the sub-pixel of array setting, often
A sub-pixel includes above-mentioned pixel circuit.Wherein, in Fig. 6, rectangle frame representational of pixel circuits.
For example, multiple pixel circuits array arrangement on display base plate, wherein, the pixel circuit in every a line sub-pixel
Scanning signal end S can be electrically connected with a scan signal line CL.First reset signal end RST1 can believe with the scanning of lastrow
Number line CL electrical connection, when lastrow scan signal line CL input low level signals, the driving in next line pixel circuit is reset
Module 10 resets the grid of driving transistor Td.
Based on this, in the shadow stage that disappears, the first reset signal end RST1 is defeated in the pixel circuit by making the first row sub-pixel
Go out low level signal, make all scan signal line CL outputs low level signals, and make the reference of data voltage end D output high level
(voltage is denoted as V to voltage at this timeD), the Vgs of driving transistor in the pixel circuit of all sub-pixels can be made to carry out while reset
(it is equal to Vint1-VD)。
Optionally, as shown in fig. 7, the display base plate further includes multiple switch module 60, a switch module 60 and one
Root grid line CL be electrically connected, all switch modules 60 with the second reset signal end RST2 and the second initial voltage end Vint2It is electrically connected
It connects；Switch module 60 is used under the control of the second reset signal end RST2, by the second initial voltage end Vint2The voltage of offer
Input is to corresponding grid line CL, so that the reference voltage that write-in compensating module 20 exports data voltage end D in the shadow stage that disappears is defeated
Enter the first pole of the driving transistor Td into drive module 50.
That is, under the control of the second reset signal end RST2, by the second initial voltage end Vint2The control source of offer is extremely
All grid line CL, and in the second initial voltage end Vint2Voltage control under, data voltage end D output reference voltage can input
To the first pole of all driving transistor Td；In the case, when the first reset signal end RST1 in one-row pixels circuit with
During the scan signal line CL electrical connections of lastrow, the first initial voltage end Vint1Voltage can input to the grid of driving transistor Td
Pole, so as to carry out the Vgs of driving transistor in the pixel circuit of all sub-pixels while reset.
It should be noted that for the second initial voltage end Vint2Voltage, compared with the first initial voltage end Vint1's
Voltage answers smaller, in the second initial voltage end Vint2Voltage control under, it is ensured that data voltage end D output reference voltage
It can input to the first pole of all driving transistor Td.
In this way, it need to only control the second reset signal end RST2 and the second initial voltage end Vint2Signal, data can be made
The reference voltage of voltage end D outputs is inputted to the first pole of driving transistor Td so that control process is simpler.
Further, as shown in fig. 7, switch module 60 includes the 7th transistor T7.
The grid of 7th transistor T7 is electrically connected with the second reset signal end RST2, and the first pole is electrically connected with grid line CL, the
Two poles and the second initial voltage end Vint2Electrical connection.
The utility model embodiment also provides a kind of display device, including above-mentioned display base plate.
The utility model embodiment also provides a kind of driving method of above-mentioned pixel circuit, as shown in figure 8, the driving method
Including：
The reset phase P1 (as shown in Figure 9) of S10, a picture frame, under the control of the first reset signal end RST1, driving
It resets module 10 and passes through the first initial voltage end Vint1Reset drive module 50.
Specifically, when the first reset signal end RST1 exports low level signal, scanning signal end S and enable signal end EM are defeated
When going out high level signal, as shown in Figure 5 b, the first transistor T1 is turned on the equivalent circuit diagram of a pixel circuit shown in Fig. 4.
The conducting of the first transistor T1, by the first initial voltage end Vint1Control source to driving transistor Td grid
Pole resets the grid of driving transistor Td, and grid voltage is made to be equal to the first initial voltage end Vint1Voltage, and to depositing
Storing up electricity holds Cst and charges, and resets storage capacitance Cst.
It should be noted that the first reset signal end RST1 and and lastrow in the pixel circuit positioned at a line sub-pixel
In the case of the scan signal line CL electrical connections of sub-pixel connection, when the scan signal line CL outputs being connected with lastrow sub-pixel
During low level signal, the first reset signal end RST1 exports low level signal in the pixel circuit of current line sub-pixel.
The write-in compensated stage P2 (as shown in Figure 9) of S11, a picture frame, under the control of scanning signal end S, write-in is mended
It repays module 20 and provides data voltage to drive module 50 by data voltage end D, and compensation data is carried out to drive module 50；Together
When, under the control of scanning signal end S, the replacement module 30 that shines passes through the first initial voltage end Vint1Reset luminescent device L.
Specifically, when scanning signal end S exports low level signal, the first reset signal end RST1 and enable signal end EM are defeated
When going out high level signal, the equivalent circuit diagram of a pixel circuit shown in Fig. 4 as shown in Figure 5 c, second transistor T2, the 3rd
Transistor T3 and the 4th transistor T4 conductings.
The conducting of third transistor T3 can make the data voltage that data voltage end D is exported (be denoted as Vdata) input extremely driving
The first pole of transistor Td, the current potential of the first pole is V at this timedata, Vgs=Vint1-Vdata＜-| Vth |, driving transistor Td is led
It is logical；The conducting of second transistor T2 so that the grid of driving transistor Td is electrically connected with the second pole, so as to storage capacitance Cst
It charges, at the same time, storage capacitance Cst discharges to the grid of driving transistor Td, until the voltage of grid reaches
Vdata- | Vth |, it charges and stops.By taking p-type enhancement transistor as an example, Vgs ＜-| Vth | when open, and as driving transistor Td
Grid voltage reach Vdata- | Vth |, driving transistor Td is closed, and data write-in at this time and compensation are completed.
In addition, the conducting of the 4th transistor T4, by the first initial voltage end Vint1Control source to luminescent device L sun
Pole, so as to be reset to remaining charge on the anode of luminescent device L, protection luminescent device L.
It should be noted that the first reset signal end RST1 and and lastrow in the pixel circuit positioned at a line sub-pixel
In the case of the scan signal line CL electrical connections of sub-pixel connection, when scan signal line CL exports low level signal, other
When scan signal line exports high level signal, in the sub-pixel being connected with scan signal line CL, the first of pixel circuit resets
Signal end RST1 exports high level signal.
The glow phase P3 (as shown in Figure 9) of S12, a picture frame, under the control of enable signal end EM, shine enabled mould
The first power voltage terminal ELVDD voltages provided are provided to drive module 50 by block 40, and make drive module 50 and luminescent device L
Connection, drive module 50 provide driving current to luminescent device L.
When enable signal end EM exports low level signal, the first reset signal end RST1 and the high electricity of scanning signal end S outputs
During ordinary mail, the equivalent circuit diagram of a pixel circuit shown in Fig. 4 as fig 5d, the 5th transistor T5 and the 6th transistor
T6 is turned on.
The conducting of 5th transistor T5 so that the voltage that the first power voltage terminal ELVDD is provided can be inputted to driving crystal
The first pole of pipe Td, and the conducting of the 6th transistor T6 so that the second pole of driving transistor Td and the anode electricity of luminescent device L
Connection.Wherein, due to the Vgs=V of driving transistor Tddata- | Vth |-ELVDD ＜-| Vth |, thus, driving transistor Td is led
Logical, the driving current of driving transistor Td flows to luminescent device L, and luminescent device L is made to shine.At this point, flow through the electricity of luminescent device L
Flowing Is is：
Is=1/2 × K × | (Vgs- (- | Vth |)) |2
=1/2 × K × | (Vdata-|Vth|-ELVDD-(-|Vth|))|2
=1/2 × K × (ELVDD-Vdata)2
Wherein, K=W/L × C × u, W/L are the breadth length ratio of driving transistor Td, and C is raceway groove capacitive dielectric layer, and u is raceway groove
Carrier mobility.
It follows that the number for being used to implement display that the electric current for flowing through driving transistor Td is only provided with data voltage end D
The voltage provided according to voltage and the first power voltage terminal ELVDD is related, unrelated with the threshold voltage vt h of driving transistor Td, from
And influences of the threshold voltage vt h of driving transistor Td to luminescent device L luminosity is eliminated, it is bright to improve luminescent device L
The homogeneity of degree.
Disappearing the shadow stage (as shown in Figure 9) between S13, adjacent image frame, under the control of the first reset signal end RST1,
Driving resets module 10 and passes through the first initial voltage end Vint1Drive module 50 is reset, meanwhile, in the control of scanning signal end S
Under, write-in compensating module 20 provides reference voltage by data voltage end D to drive module 50, makes to drive in drive module 50 brilliant
Body pipe Td is in the conduction state.
Specifically, when scanning signal end S and the first reset signal end RST1 exports low level signal, enable signal end EM is defeated
When going out high level signal, the equivalent circuit diagram of a pixel circuit shown in Fig. 4 as shown in Figure 5 a, the first transistor T1, second
Transistor T2, third transistor T3 are both turned on.(transistor in cut-off state is represented with beating "×").
The conducting of the first transistor T1 and second transistor T2 so that the control source of the first initial voltage end Vint1 is extremely
The grid of driving transistor Td and the second pole；The conducting of third transistor T3 so that the reference voltage of data voltage end D outputs
(V is denoted as at this timeD) input is to the first pole of driving transistor Td, so that the Vgs=V of all driving transistor Tdint1-VD,
Driving transistor Td is turned on, no matter in this way, the data voltage of former frame, driving transistor Td is all by same state into line number
According to voltage write-in and threshold voltage compensation, so as to improve the short-term image retention problem generated by hysteresis effect.
It should be noted that when the first reset signal end RST1 and lastrow in the pixel circuit of a line sub-pixel
When scan signal line CL is electrically connected, need to only control makes all grid line CL outputs low level signals, certainly, the picture of the first row sub-pixel
The first reset signal end RST1 also exports low level signal in plain circuit, can turn on all driving transistor Td, and drives
The Vgs=V of transistor Tdint1-VD。
In addition, after the shadow stage that disappears, in the reset phase of next image frame, to the grid of driving transistor Td into
Row is reset, and the Vgs of driving transistor Td can be made to still maintain Vint1-VD, until data voltage writes.
It should be noted that when above-mentioned pixel circuit is applied to display panel, multiple pixel circuits are in display base plate
Upper array arrangement, during a picture frame is shown, scan signal line CL is opened line by line, is completed picture frame and is shown.All
After pixel circuit in row sub-pixel all completes the P1-P3 stages, all pixels circuit, which enters, to disappear the shadow stage.
In addition, as shown in figure 9, the first mistake is further included between shadow stage and the reset phase P1 stages of next image frame disappearing
Cross the stage；The second transition stage is further included between an image frame data write phase P2 and glow phase P3.For example, the first mistake
The stage of crossing can carry out the signal of scanning signal end S, the first reset signal end RST1, enable signal end EM, data voltage end D
Overturning ensures that the corresponding signal end of follow-up phase chronologically exports significant level.It is understood that enable signal end EM's has
Effect level time should be longer than the significant level time of scanning signal end S and the significant level time of data voltage end D, the second mistake
The stage of crossing is in order to ensure data voltage write driver transistor, ensures to receive correctly driving in glow phase light emitting diode
Electric current.
When above-mentioned pixel circuit is arranged in the sub-pixel of display base plate, and positioned at the pixel circuit per a line sub-pixel
Middle scanning signal end S is electrically connected with a scan signal line CL, the scan signal line of the first reset signal end RST1 and lastrow
When CL electrical connections are (with reference to shown in figure 6), in a picture frame, scan signal line CL inputs scanning signal line by line, and data signal end D is defeated
Go out data voltage, the pixel circuit in every row sub-pixel is made to carry out the driving process of above-mentioned S10 and S11, and in energy signal end
Under the control of EM, the pixel circuit in every row sub-pixel is made to carry out the driving process of S12.After picture frame display is completed,
The shadow stage that disappears is carried out, inputs scanning signal simultaneously in the shadow stage that disappears all scan signal line CL, data signal end D outputs are with reference to electricity
Pressure carries out the driving process of above-mentioned S13.
The utility model embodiment also provides a kind of driving method of display base plate, which includes sub-pixel, often
A sub-pixel includes above-mentioned pixel circuit；Wherein, the scanning signal end S and one in the pixel circuit of every a line sub-pixel
Root scan signal line CL is electrically connected, and a switch module 60 is electrically connected with a grid line CL, and all switch modules 60 are with the
Two reset signal end RST2 and the second initial voltage end Vint2 electrical connections are (with reference to shown in figure 7).
As shown in Figure 10, which includes：
The reset phase P1 (as shown in figure 11) of S20, a picture frame under the control of the first reset signal end RST1, drive
The dynamic module 10 that resets passes through the first initial voltage end Vint1Reset drive module 50.
Specifically refer to the description at above-mentioned S10.
The write-in compensated stage P2 (as shown in figure 11) of S21, a picture frame, under the control of scanning signal end S, write-in is mended
It repays module 20 and provides data voltage to drive module 50 by data voltage end D, and compensation data is carried out to drive module 50；Together
When, under the control of scanning signal end S, the replacement module 30 that shines passes through the first initial voltage end Vint1Reset luminescent device L.
Specifically refer to the description at above-mentioned S11.
The glow phase P3 (as shown in figure 11) of S22, a picture frame under the control of enable signal end EM, shine enabled
The first power voltage terminal ELVDD voltages provided are provided to drive module 50 by module 40, and make drive module 50 and photophore
Part L connections, drive module 50 provide driving current to luminescent device L.
Specifically refer to the description at above-mentioned S12.
Disappearing the shadow stage (as shown in figure 11) between S23, adjacent image frame, in the control of the first reset signal end RST1
Under, driving resets module 10 and passes through the first initial voltage end Vint1Drive module 50 is reset, meanwhile, at the second reset signal end
Under the control of RST2, the second initial voltage end Vint2The voltage of offer is inputted by switch module 60 to grid line CL, so that write-in
Compensating module 20 provides reference voltage by data voltage end D to drive module 50, makes driving transistor Td in drive module 50
It is in the conduction state.
For the pixel circuit of all sub-pixels, under the control of the second reset signal end RST2 output signals, when second
Initial voltage end Vint2When the control source of offer is to grid line CL, the scanning signal end S being connected with grid line CL exports low level
Signal, so that scanning signal end S exports low level signal, the first reset signal end RST1 being connected certainly with grid line CL is also defeated
Go out low level signal.
Specifically refer to the description at above-mentioned S13.
It should be noted that for Figure 11, the is further included between shadow stage and the reset phase P1 stages of next frame disappearing
One transition stage further includes the second transition stage between an image frame data write phase P2 and glow phase P3.For example, the
One transition stage can by scanning signal end S, the first reset signal end RST1, enable signal end EM, data voltage end D signal
It is overturn, ensures that the corresponding signal end of follow-up phase chronologically exports significant level.It is understood that enable signal end EM
The significant level time should be longer than the significant level time of scanning signal end S and the significant level time of data voltage end D,
Two transition stages are in order to ensure data voltage write driver transistor, ensure to receive in glow phase light emitting diode correct
Driving current.
The above is only specific embodiment of the present utility model, but the scope of protection of the utility model is not limited to
In this, in the technical scope that any one skilled in the art discloses in the utility model, variation can be readily occurred in
Or replace, it should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model should be with the power
Subject to the protection domain of profit requirement.
Claims (11)
1. a kind of pixel circuit, which is characterized in that including：Driving resets module, write-in compensating module, shining resets module, hair
Light enables module, drive module and luminescent device；The drive module include driving transistor, the first of the driving transistor
Pole is connected with said write compensating module；
The driving resets module, the first reset signal end, the first initial voltage end and drive module is connected respectively, in institute
Under the control for stating the first reset signal end, control source that the first initial voltage end the is provided institute into the drive module
The grid of driving transistor is stated, the drive module is reset；
Compensating module is write, connects scanning signal end, data voltage end and the drive module respectively, in the scanning letter
Under the control at number end, in the shadow stage that disappears, the reference voltage that the data voltage end exports is inputted to the drive module, makes institute
It is in the conduction state in the shadow stage that disappears to state driving transistor；In write-in compensated stage, the data that the data voltage end is exported
Control source carries out compensation data to the drive module, and to the drive module；
It shines and resets module, connect the scanning signal end, the first initial voltage end and the luminescent device respectively, be used for
Under the control at the scanning signal end, the control source that the first initial voltage end is provided is right to the luminescent device
The luminescent device is reset；
Shine enabled module, connects enable signal end, the first power voltage terminal, the drive module and the photophore respectively
Part, under the control at the enable signal end, the voltage of first power voltage terminal to be provided to the drive module,
And the drive module is made to be connected with the luminescent device；
The driving transistor, for providing driving current to the luminescent device.
2. pixel circuit according to claim 1, which is characterized in that the drive module also with first supply voltage
End connection；
The drive module further includes storage capacitance；
The grid of the driving transistor resets module and said write compensating module with the driving and is electrically connected, the first pole and the
Two are extremely electrically connected with the luminous enabled module and said write compensating module；
One end of the storage capacitance is electrically connected with the grid of the driving transistor, the other end and first power voltage terminal
Electrical connection.
3. pixel circuit according to claim 1, which is characterized in that the driving, which resets module, includes the first transistor；
The grid of the first transistor is electrically connected with the first reset signal end, the first pole and the grid of the driving transistor
Pole is electrically connected, and the second pole is electrically connected with the first initial voltage end.
4. pixel circuit according to claim 1, which is characterized in that said write compensating module include second transistor and
Third transistor；
The grid of the second transistor is electrically connected with the scanning signal end, the first pole and the grid electricity of the driving transistor
Connection, the second pole is electrically connected with the second pole of the driving transistor；
The grid of the third transistor is electrically connected with the scanning signal end, and the first pole is electrically connected with the data voltage end,
Second pole is electrically connected with the first pole of the driving transistor.
5. pixel circuit according to claim 1, which is characterized in that the luminous replacement module includes the 4th transistor；
The grid of 4th transistor is electrically connected with the scanning signal end, and the first pole is electrically connected with the first initial voltage end
It connects, the second pole is electrically connected with the luminescent device.
6. pixel circuit according to claim 1, which is characterized in that the enabled module that shines include the 5th transistor and
6th transistor；
The grid of 5th transistor is electrically connected with the enable signal end, and the first pole is electrically connected with first power voltage terminal
It connects, the second pole is electrically connected with the first pole of the driving transistor；
The grid of 6th transistor is electrically connected with the enable signal end, the first pole and the second pole of the driving transistor
Electrical connection, the second pole is electrically connected with the luminescent device.
7. according to claim 1-6 any one of them pixel circuits, which is characterized in that the luminescent device includes light-emitting diodes
Pipe；
The anode of the light emitting diode is electrically connected with the luminous enabled module and the luminous replacement module, cathode and second
Power voltage terminal is electrically connected.
8. a kind of display base plate, the sub-pixel set including array, which is characterized in that each sub-pixel will including right
Seek 1-7 any one of them pixel circuits.
9. display base plate according to claim 8, which is characterized in that the scanning letter of pixel circuit described in a line sub-pixel
Number end is connected with a grid line；
The display base plate further includes multiple switch module, and a switch module is connected with a grid line, Suo Yousuo
Switch module is stated to be connected with the second reset signal end and the second initial voltage end；
The switch module is used under the control at the second reset signal end, the electricity that the second initial voltage end is provided
Pressure input is to the grid line, so that write-in compensating module inputs the reference voltage that data voltage end exports to drive in the shadow stage that disappears
Dynamic model block.
10. display base plate according to claim 9, which is characterized in that the switch module includes the 7th transistor；
The grid of 7th transistor is electrically connected with the second reset signal end, and the first pole is electrically connected with the grid line, the
Two poles are electrically connected with the second initial voltage end.
11. a kind of display device, which is characterized in that including claim 8-10 any one of them display base plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721105788.8U CN207425322U (en) | 2017-08-30 | 2017-08-30 | Pixel circuit, display base plate and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721105788.8U CN207425322U (en) | 2017-08-30 | 2017-08-30 | Pixel circuit, display base plate and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207425322U true CN207425322U (en) | 2018-05-29 |
Family
ID=62315246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721105788.8U Active CN207425322U (en) | 2017-08-30 | 2017-08-30 | Pixel circuit, display base plate and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207425322U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109192141A (en) * | 2018-10-30 | 2019-01-11 | 京东方科技集团股份有限公司 | Display panel and its detection method, display device |
| CN109256088A (en) * | 2018-10-31 | 2019-01-22 | 京东方科技集团股份有限公司 | Pixel circuit, display panel, display device and image element driving method |
| KR20190143308A (en) * | 2018-06-20 | 2019-12-30 | 삼성전자주식회사 | Pixel and organic light emitting display device comprising the same |
| WO2020114086A1 (en) * | 2018-12-05 | 2020-06-11 | 京东方科技集团股份有限公司 | Pixel circuit, pixel drive method, and display apparatus |
| CN111354315A (en) * | 2020-04-15 | 2020-06-30 | 京东方科技集团股份有限公司 | Display panel, display device and pixel driving method |
| CN111883043A (en) * | 2020-07-30 | 2020-11-03 | 合肥维信诺科技有限公司 | Pixel circuit, driving method thereof and display panel |
| CN112992092A (en) * | 2021-02-19 | 2021-06-18 | 昆山龙腾光电股份有限公司 | Drive circuit and control method thereof |
-
2017
- 2017-08-30 CN CN201721105788.8U patent/CN207425322U/en active Active
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190143308A (en) * | 2018-06-20 | 2019-12-30 | 삼성전자주식회사 | Pixel and organic light emitting display device comprising the same |
| CN110634446A (en) * | 2018-06-20 | 2019-12-31 | 三星电子株式会社 | Pixel and organic light emitting display device including the same |
| KR102514242B1 (en) | 2018-06-20 | 2023-03-28 | 삼성전자주식회사 | Pixel and organic light emitting display device comprising the same |
| US11024229B2 (en) | 2018-10-30 | 2021-06-01 | Beijing Boe Display Technology Co., Ltd. | Display panel and detection method thereof, and display device |
| CN109192141A (en) * | 2018-10-30 | 2019-01-11 | 京东方科技集团股份有限公司 | Display panel and its detection method, display device |
| CN109256088A (en) * | 2018-10-31 | 2019-01-22 | 京东方科技集团股份有限公司 | Pixel circuit, display panel, display device and image element driving method |
| CN109256088B (en) * | 2018-10-31 | 2021-10-01 | 京东方科技集团股份有限公司 | Pixel circuit, display panel, display device and pixel driving method |
| US11132951B2 (en) | 2018-12-05 | 2021-09-28 | Mianyang Boe Optoelectronics Technology Co., Ltd. | Pixel circuit, pixel driving method and display device |
| WO2020114086A1 (en) * | 2018-12-05 | 2020-06-11 | 京东方科技集团股份有限公司 | Pixel circuit, pixel drive method, and display apparatus |
| CN111354315A (en) * | 2020-04-15 | 2020-06-30 | 京东方科技集团股份有限公司 | Display panel, display device and pixel driving method |
| CN111883043A (en) * | 2020-07-30 | 2020-11-03 | 合肥维信诺科技有限公司 | Pixel circuit, driving method thereof and display panel |
| CN112992092A (en) * | 2021-02-19 | 2021-06-18 | 昆山龙腾光电股份有限公司 | Drive circuit and control method thereof |
| CN112992092B (en) * | 2021-02-19 | 2022-10-14 | 昆山龙腾光电股份有限公司 | Drive circuit and control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107452334A (en) | Image element circuit and its driving method, display base plate and its driving method, display device | |
| CN207425322U (en) | Pixel circuit, display base plate and display device | |
| CN107170408B (en) | Pixel circuit, driving method, organic electroluminescent display panel and display device | |
| CN106910468B (en) | The driving method of display panel, display device and pixel circuit | |
| CN105139804B (en) | A kind of pixel-driving circuit, display panel and its driving method and display device | |
| CN205541822U (en) | Pixel circuit , array substrate , display panel and display device | |
| CN105427800B (en) | Pixel circuit, driving method, organic EL display panel and display device | |
| CN106952617B (en) | Pixel-driving circuit and method, display device | |
| CN104464643B (en) | Display device, pixel driving circuit and driving method of pixel driving circuit | |
| CN104835452B (en) | Pixel circuit and driving method and related devices thereof | |
| CN100570685C (en) | Active-matrix type display device and driving method thereof | |
| CN107358918A (en) | A kind of image element circuit and its driving method, display device | |
| CN107068057B (en) | A kind of pixel-driving circuit, its driving method and display panel | |
| CN102654979B (en) | Pixel circuit, display panel, display device and electronic unit | |
| CN103413519B (en) | A kind of image element circuit and driving method, array base palte and display unit | |
| CN107452331A (en) | A kind of image element circuit and its driving method, display device | |
| CN104036725B (en) | Image element circuit and its driving method, organic electroluminescence display panel and display device | |
| CN107342049B (en) | The driving method of display panel and display panel | |
| CN108682392A (en) | Pixel circuit and its driving method, display panel, production method and display device | |
| CN105632383B (en) | A kind of test circuit, test method, display panel and display device | |
| CN104933991B (en) | Pixel-driving circuit, display base plate and its driving method, display device | |
| CN105448234B (en) | Pixel circuit and its driving method and active matrix/organic light emitting display | |
| CN109256094A (en) | Pixel circuit, image element driving method and display device | |
| CN109801596A (en) | A kind of pixel circuit, display panel and its driving method | |
| CN109448637A (en) | A kind of pixel-driving circuit and its driving method, display panel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |