CN106340268B - A kind of pixel-driving circuit and its driving method, display device - Google Patents

A kind of pixel-driving circuit and its driving method, display device Download PDF

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Publication number
CN106340268B
CN106340268B CN201610998752.0A CN201610998752A CN106340268B CN 106340268 B CN106340268 B CN 106340268B CN 201610998752 A CN201610998752 A CN 201610998752A CN 106340268 B CN106340268 B CN 106340268B
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China
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common node
signal
driving
pixel
scanning signal
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CN201610998752.0A
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Chinese (zh)
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CN106340268A (en
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袁志东
李永谦
曹昆
袁粲
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京东方科技集团股份有限公司
合肥鑫晟光电科技有限公司
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Priority to CN201610998752.0A priority Critical patent/CN106340268B/en
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]
    • G09G3/3225Control 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

Abstract

The present invention discloses a kind of pixel-driving circuit and its driving method, display device, is related to display technology field, interfering between the signal transmitted respectively on data wire and scan line for solution reduction.One drive cycle of the pixel-driving circuit includes data write unit, compensating unit, driver element, working cell, the first common node, the second common node and the 3rd common node including compensation period and working hour, pixel-driving circuit;Wherein, scanning signal is received in compensation period, data write unit and compensating unit, makes that there is the first potential difference between the second common node and the first common node;Section at work, compensating unit receive scanning signal, the potential difference between the second common node and the 3rd common node is maintained at the first potential difference, and driver element generates a drive signal, drive signal driving working cell work.Pixel-driving circuit provided by the invention is used to drive working cell to work.

Description

A kind of pixel-driving circuit and its driving method, display device

Technical field

The present invention relates to display technology field, more particularly to a kind of pixel-driving circuit and its driving method, display device.

Background technology

Display device is that one kind is used to show word, numeral, symbol, picture, or by word, numeral, symbol and picture In the device of the picture such as image that is formed of at least two combinations.Generally, display device includes the multiple pixel lists being arranged in array Member, for example, for OLED display, the pixel cell of OLED display is then made up of OLED, by controlling pixel Unit is luminous or does not light, to realize that the picture of display device is shown.

At present, display device can be divided into active-drive type display device and passive matrix formula according to the difference of type of drive Display device;Wherein, the inside of active-drive type display device includes being used to drive pixel cell (such as OLED) luminous Pixel-driving circuit, pixel-driving circuit correspondingly drives the pixel cell in display device to light, to realize display device Display function.But due to the limitation of the structure of pixel-driving circuit in existing display device, when passing through pixel-driving circuit When pixel cell in corresponding driving display device is luminous, it usually needs multiple scanning signals are inputted to pixel-driving circuit, because And often row pixel cell needs to be correspondingly arranged more scan lines in display device, and scan line corresponding to each column pixel cell with setting Infall between the data wire put would generally form parasitic capacitance between line, thus cause between display device center line parasitic capacitance compared with Greatly, when correspondingly driving pixel cell by existing pixel-driving circuit, the signal that is transmitted respectively on data wire and scan line Between easily produce interfere.

The content of the invention

It is an object of the invention to provide a kind of pixel-driving circuit and its driving method, display device, for solving to lead to When crossing existing pixel-driving circuit and correspondingly driving pixel cell, hold between the signal transmitted respectively on data wire and scan line It is also easy to produce the technical problem interfered.

To achieve these goals, the present invention provides following technical scheme:

The first aspect of the present invention provides a kind of pixel-driving circuit, a drive cycle bag of the pixel-driving circuit Compensation period and working hour are included, the pixel-driving circuit includes data write unit, compensating unit, driver element, work Unit, the first common node, the second common node and the 3rd common node;Wherein,

The data write unit connects first common node, and the data write unit is used for:In the compensation Period, receive scanning signal and data-signal, and export the data-signal to described the under the control of the scanning signal One common node;

The compensating unit connects the first common node, second common node and the 3rd common node; The compensating unit is used for:In the compensated stage, the scanning signal is received, and under the control of the scanning signal, is utilized The current potential of 3rd common node, make the current potential lifting of second common node, make second common node with it is described There is the first potential difference between first common node;In the working stage, scanning signal is received, and in the control of the scanning signal Under system, the potential difference between second common node and the 3rd common node is set to be maintained at first potential difference;

The driver element connects one end of second common node, the 3rd common node and power supply;The drive Moving cell is used for:In the compensation period, the first power supply potential signal, and the control of the current potential in second common node are received By the first power supply potential signal output to the 3rd common node under system;In the working hour, the first power supply electricity is received Position signal, and under the control of the current potential in second common node, generate a drive signal;

The working cell connects the other end of the 3rd common node and the power supply, and the working cell is used for: In the working hour, worked under the driving of the drive signal.

The second aspect of the present invention provides a kind of driving method of pixel-driving circuit, applied to such as above-mentioned technical scheme institute The pixel-driving circuit stated, the driving method of the pixel-driving circuit include multiple drive cycles, each drive cycle Including:

The period is compensated, scanning signal and data-signal is inputted to data write unit, makes the data write unit at this Under the control of scanning signal, the data-signal is exported to the first common node;The first power supply potential is inputted to driver element Signal, make the driver element under the control of the current potential of the second common node by the first power supply potential signal output to the 3rd Common node;Scanning signal is inputted to compensating unit, makes the compensating unit under the control of the scanning signal, utilizes described the The current potential of three common nodes, make the current potential lifting of second common node, make second common node public with described first There is the first potential difference between conode;

Working hour, scanning signal is inputted to the compensating unit, makes control of the compensating unit in the scanning signal Under, the potential difference between second common node and the 3rd common node is maintained at first potential difference;To institute State driver element and input the first power supply potential signal, make control of the driver element in the current potential of second common node Under, generate a drive signal;Utilize drive signal driving working cell work.

The third aspect of the present invention provides a kind of display device, including the pixel driver electricity as described in above-mentioned technical scheme Road.

When correspondingly driving pixel cell using pixel-driving circuit provided by the invention, in the compensation period, data write-in Unit receives scanning signal and data-signal, and exports data-signal to the first public section under the control of the scanning signal Point;Compensating unit receives scanning signal, and under the control of the scanning signal, using the current potential of the 3rd common node, makes second The current potential lifting of common node, make that there is the first potential difference between the second common node and the first common node;Section at work, Compensating unit receives scanning signal, and under the control of the scanning signal, makes between the second common node and the 3rd common node Potential difference be maintained at the first potential difference.As can be seen here, when correspondingly driving pixel using pixel-driving circuit provided by the invention During unit, in the compensation period, data write unit and compensating unit receive same scan signal, at work section, data write-in Unit is no longer controlled by scanning signal, and compensating unit receives scanning signal, therefore, is provided with pixel driver provided by the invention In the display device of circuit, often row pixel cell only needs to be correspondingly arranged a scan line, and the scan line is data write unit 1 With compensating unit input scanning signal, with existing display device in often row pixel cell need to be correspondingly arranged more scan line phases Than that can reduce parasitic capacitance between display device center line, when correspondingly driving pixel cell by existing pixel-driving circuit, subtract The generation of the phenomenon interfered is produced between few signal transmitted respectively on data wire and scan line.

Brief description of the drawings

Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the present invention, this hair Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is the structural representation of pixel-driving circuit provided in an embodiment of the present invention;

Fig. 2 is the control sequential figure of pixel-driving circuit in Fig. 1.

Reference:

1- data write units, 2- compensating units,

3- driver elements, 4- working cells,

T1- first switch pipes, T2- second switch pipes,

The switching tubes of T3- the 3rd, Td- driving tubes,

C1- storage capacitances, C2- parasitic capacitances,

D-OLED devices, the common nodes of A- first,

The common nodes of B- second, the common nodes of P- the 3rd,

Data- data-signals, Scan- scanning signals,

VSS- the first power supply potential signals, VDD- second source electric potential signals,

Q1- compensates period, Q2- working hours.

Embodiment

In order to further illustrate pixel-driving circuit and its driving method provided in an embodiment of the present invention, display device, under Face is described in detail with reference to Figure of description.

Fig. 1 and Fig. 2 are referred to, when a drive cycle of pixel-driving circuit provided in an embodiment of the present invention includes compensation Section Q1 and working hour Q2, the pixel-driving circuit include data write unit 1, compensating unit 2, driver element 3, job note Member the 4, first common node A, the second common node B and the 3rd common node P;Wherein, the connection first of data write unit 1 is public Node A, data write unit 1 are used for:In compensation period Q1, scanning signal Scan and data-signal Data is received, and sweep at this Retouch and export data-signal Data to the first common node A under signal Scan control.

Compensating unit 2 connects the first common node A, the second common node B and the 3rd common node P;Compensating unit 2 is used In:In compensated stage, scanning signal Scan is received, and under scanning signal Scan control, utilize the 3rd common node P's Current potential, make the second common node B current potential lifting, make that there is the first current potential between the second common node B and the first common node A Difference;In working stage, scanning signal Scan is received, and under scanning signal Scan control, make the second common node B and the Potential difference between three common node P is maintained at the first potential difference.

Driver element 3 connects one end of the second common node B, the 3rd common node P and power supply;Driver element 3 is used for: Period Q1 is compensated, receives the first power supply potential signal VSS, and by first electricity under the control of the current potential in the second common node B Source electric potential signal VSS is exported to the 3rd common node P;Section Q2 at work, the first power supply potential signal VSS is received, and the Under the control of two common node B current potential, a drive signal is generated.

Working cell 4 connects the other end of the 3rd common node P and power supply, and working cell 4 is used for:Section Q2 at work, Worked under the driving of drive signal.

Please continue to refer to Fig. 1 and Fig. 2, above-mentioned pixel-driving circuit is in the course of work of a drive cycle:Compensating Period Q1, data write unit 1 receive scanning signal Scan and data-signal Data, and under scanning signal Scan control Data-signal Data is exported to the first common node A;Driver element 3 receives the first power supply potential signal VSS, and public second The first power supply potential signal VSS is exported to the 3rd common node P under the control of conode B current potential;Compensating unit 2 receives Scanning signal Scan, and under scanning signal Scan control, using the 3rd common node P current potential, make the second public section Point B current potential lifting, so as to have the first potential difference between the second common node B and the first common node A.

Section Q2 at work, compensating unit 2 receives scanning signal Scan, and under scanning signal Scan control, makes Potential difference between second common node B and the 3rd common node P is maintained at the first potential difference;Driver element 3 receives the first electricity Source electric potential signal VSS, driver element 3 generate a drive signal, drive signal under the control of the second common node B current potential Driving working cell 4 works.

From the foregoing, it will be observed that when correspondingly driving pixel cell using pixel-driving circuit provided in an embodiment of the present invention, mending Period Q1 is repaid, data write unit 1 receives scanning signal Scan and data-signal Data, and in scanning signal Scan control It is lower to export data-signal Data to the first common node A;Compensating unit 2 receives scanning signal Scan, and in the scanning signal Under Scan control, using the 3rd common node P current potential, make the second common node B current potential lifting, make the second common node There is the first potential difference between B and the first common node A;Section Q2 at work, compensating unit 2 receive scanning signal Scan, and Under scanning signal Scan control, the potential difference between the second common node B and the 3rd common node P is set to be maintained at first Potential difference.As can be seen here, when correspondingly driving pixel cell using pixel-driving circuit provided in an embodiment of the present invention, compensating Period Q1, data write unit 1 and compensating unit 2 receive same scan signal Scan, at work section Q2, data write unit 1 is no longer controlled by scanning signal Scan, and compensating unit 2 receives scanning signal Scan, therefore, is provided with the embodiment of the present invention and carries In the display device of the pixel-driving circuit of confession, often row pixel cell only needs to be correspondingly arranged a scan line, and the scan line is Data write unit 1 and compensating unit 2, which input in scanning signal Scan, with existing display device often row pixel cell, to be needed pair More scan lines should be set to compare, parasitic capacitance between display device center line can be reduced, pass through existing pixel-driving circuit pair When should drive pixel cell, reduce and the phenomenon that interferes is produced between the signal that is transmitted respectively on data wire and scan line Occur.

Due to being provided with the display device of pixel-driving circuit provided in an embodiment of the present invention, often row pixel cell only needs A scan line is correspondingly arranged, the scan line is data write unit 1 and compensating unit 2 inputs scanning signal Scan, thus Parasitic capacitance between display device center line can be reduced, so as to realize the high PPI of display device (Pixels Per Inch, as Plain density) display.

Further, since be provided with the display device of pixel-driving circuit provided in an embodiment of the present invention, every row pixel list Member only needs to be correspondingly arranged a scan line, and the scan line is that data write unit 1 and compensating unit 2 input scanning signal Scan, therefore, the structure of pixel-driving circuit can be simplified, reduce the area shared by pixel-driving circuit, increase pixel list The aperture opening ratio of member, extend the service life of display device.

Furthermore when correspondingly driving pixel cell by pixel-driving circuit provided in an embodiment of the present invention, in the compensation period The data write unit 1 that Q1, data-signal Data are subjected to scanning signal Scan controls is exported to the first common node A, and Working hour Q2, pixel-driving circuit can no longer receive data-signal Data, therefore, pass through picture provided in an embodiment of the present invention When plain drive circuit correspondingly drives pixel cell, data-signal Data waveform can be simplified, prevent factor data signal Data's Waveform is complicated and causes the phenomenon that crosstalk occurs during transmission data-signal Data.

When correspondingly driving pixel cell by pixel-driving circuit provided in an embodiment of the present invention, section Q2, is mended at work Repay unit 2 and receive scanning signal Scan, and under scanning signal Scan control, make the second common node B and the 3rd public Potential difference between node P is maintained at the first potential difference, that is to say, that makes to connect the one of the second common node B in driver element 3 The potential difference connected in end and driver element 3 between the 3rd common node P one end is maintained at the first potential difference, thus can be to prevent Only connected in driver element 3 second common node B one end and driver element 3 in connect the 3rd common node P one end between Potential difference produce fluctuation, improve steady when driver element 3 generates drive signal under the control of the second common node B current potential It is qualitative, improve stability when working cell 4 works.

It is noted that the pixel-driving circuit that above-described embodiment provides can apply in a variety of display devices, example Such as, the pixel-driving circuit that above-described embodiment provides can apply to liquid crystal display device, and now, pixel cell is liquid crystal Pixel cell in showing device;Or the pixel-driving circuit that above-described embodiment provides can apply in OLED display, Now, pixel cell can be OLED.

The pixel-driving circuit provided below by taking specific circuit structure as an example the embodiment of the present invention is introduced, its In, pixel-driving circuit is applied in OLED display, and pixel cell is OLED.

Please continue to refer to Fig. 1, data write unit 1 includes first switch pipe T1, and first switch pipe T1 control terminal receives Scanning signal Scan, first switch pipe T1 input receives data-signal Data, first switch pipe T1 output end connection the One common node A.

Compensating unit 2 includes:Storage capacitance C1, and the second switch pipe T2 and the 3rd switching tube that channel type is opposite T3;Wherein, storage capacitance C1 one end connects the first common node A, and the storage capacitance C1 other end connects the second common node B;Second switch pipe T2 control terminal receives scanning signal Scan, and second switch pipe T2 input connects the 3rd common node P, Second switch pipe T2 output end connects the first common node A;Section Q2 at work, second switch pipe T2 control terminal are received and swept Signal Scan is retouched, and is opened under scanning signal Scan control;The control terminal of 3rd switch transistor T 3 receives scanning signal Scan, the input of the 3rd switch transistor T 3 connect the 3rd common node P, and the output end of the 3rd switch transistor T 3 connects the second public section Point B;In compensation period Q1, the control terminal of the 3rd switch transistor T 3 receives scanning signal Scan, and in scanning signal Scan control System is lower to be opened.

Driver element 3 includes driving tube Td, and driving tube Td control terminal connects the second common node B, and driving tube Td's is defeated Enter end and receive power supply potential signal, driving tube Td output end connects the 3rd common node P.

Working cell 4 includes:OLED D, OLED D negative electrode connect the 3rd common node P, OLED D's Anode connects the other end of power supply, and OLED D is used to light under the driving of drive signal;Parasitic capacitance C2, parasitic capacitance C2 one end connection OLED D anode, parasitic capacitance C2 other end connection OLED D negative electrode.

Wherein, the threshold voltage between driving tube Td control terminal and driving tube Td input is equal to driving tube Td control Threshold voltage between end processed and driving tube Td output end, i.e. VTH_Td_GD=VTH_Td_GS

First switch pipe T1 channel type is identical with the channel type of the 3rd switch transistor T 3, driving tube Td channel type With first switch pipe T1 channel type on the contrary, the i.e. channel type of first switch pipe T1 channel type and the 3rd switch transistor T 3 Identical, second switch pipe T2 channel type is identical with driving tube Td channel type, and first switch pipe T1 channel type Channel type with second switch pipe T2 is on the contrary, when it is implemented, first switch pipe T1 and the 3rd switch transistor T 3 are that N-type channel is brilliant Body pipe, now, first switch pipe T1 control terminal and the control terminal of the 3rd switch transistor T 3 can be opened when receiving the signal of high level, Meet VGS> VTHWhen, first switch pipe T1 and the 3rd switch transistor T 3 can be opened, and second switch pipe T2 and driving tube Td are p-type Channel transistor, now, second switch pipe T2 control terminal and driving tube Td control terminal can be beaten when receiving low level signal Open, that is, meet VGS< VTHWhen, second switch pipe T2 and driving tube Td can be opened;Or first switch pipe T1 and the 3rd switching tube T3 is P-type channel transistor, and second switch pipe T2 and driving tube Td are N-type channel transistor.In embodiments of the present invention, with One switch transistor T 1 and the 3rd switch transistor T 3 are that N-type channel transistor, second switch pipe T2 and driving tube Td are P-type channel transistor Exemplified by be described in detail.

The course of work of specific pixel-driving circuit that above-described embodiment provides is:In a drive cycle, including Following two periods:

Period Q1 is compensated, first switch pipe T1 receives the scanning signal Scan of high level, and scanning signal Scan's Control is lower to open, and the data-signal Data that first switch pipe T1 receives first switch pipe T1 input is by first switch pipe T1 Output end export to the first common node A, it is assumed that data-signal Data current potential is Vdata;In compensating unit 2, the 3rd switch Pipe T3 receives the scanning signal Scan of high level, and is opened under scanning signal Scan control, now, second source current potential Signal VDD is low level, and the OLED D in working cell 4 does not work, and second source electric potential signal VDD is parasitic capacitance C2 Charging, under storage capacitance C1 and parasitic capacitance C2 collective effect, the second common node B current potential is lifted, and second is public Node B current potential is more than 0V and close to 0V;In driver element 3, driving tube Td input receives the first power supply of high level Electric potential signal VSS, it is assumed that the first power supply potential signal VSS of high level level is Vref, at this point it is possible to think, driving tube Td Control terminal and driving tube Td input between potential difference VTd_GDFor-Vref, thus, driving tube Td control terminal and driving Potential difference V between pipe Td inputTd_GDMeet VTd_GD< VTH_Td_GD, i.e., driving tube Td control terminal is with driving tube Td's Potential difference V between inputTd_GDControl terminal less than driving tube Td and the threshold voltage between driving tube Td input VTH_Td_GD, driving tube Td opens under the driving of the second common node B current potential, and driving tube Td is by the first power supply potential signal VSS is exported to the 3rd common node P, because the 3rd switch transistor T 3 is opened, thus the 3rd switch transistor T 3 by driving tube Td export to 3rd common node P the first power supply potential signal VSS is exported to the second common node B, is charged for the second common node B, when Second common node B current potential VBMeet:

VB=Vref+VTH_Td_GD (1)

Driving tube Td no longer meets VTd_GD< VTH_Td_GD, driving tube Td closings, compensate period Q1 and terminate, now, second is public Potential difference between conode B and the first common node A is VBA

VBA=Vref+VTH_Td_GD-Vdata (2)

Potential difference V between second common node B and the first common node ABAAs the first potential difference or storage capacitance C1 Voltage.

Working hour Q2, in compensating unit 2, second switch pipe T2 receives low level scanning signal Scan, and is swept at this Retouch and opened under signal Scan control, storage capacitance C1 the second common nodes of connection B one end floating;Second source electric potential signal VDD is high level, and in the presence of parasitic capacitance C2, the 3rd common node P current potential is lifted, because second switch pipe T2 is beaten Open, the first common node A current potential is identical with the 3rd common node P current potential, and now, the first common node A current potential occurs Change, i.e. the current potential of the first common node A changes, under storage capacitance C1 bootstrap effect, the second common node B electricity Position also changes, and the potential difference between the second common node B and the first common node A is maintained at the first potential difference, now, drives The potential difference of dynamic pipe Td control terminal and driving tube Td output end is also the first potential difference, because driving tube Td meets:Driving Threshold voltage V between pipe Td control terminal and driving tube Td inputTH_Td_GDControl terminal and driving equal to driving tube Td Threshold voltage V between pipe Td output endTH_Td_GS, thus driving tube Td meets:VTd_GS< VTH_Td_GS, driving tube Td openings, Driving tube Td input receives low level first power supply potential signal VSS, generates a drive signal, drive signal driving OLED D lights, wherein, the potential difference V of driving tube Td control terminal and driving tube Td output endTd_GS, driving tube Td Control terminal and the potential difference V of driving tube Td inputTd_GDMeet:

VTd_GS=VTd_GD=Vref+VTH_Td_GD-Vdata (4)

According to the calculation formula of OLED D operating current:

Wherein, μ be driving tube Td carrier mobility, CoxFor the capacitivity of insulating barrier in driving tube Td, W is driving tube The width of raceway groove in Td, L are the length of raceway groove in driving tube Td.

Formula (4) is substituted into formula (5), can be obtained:

According to above-mentioned analysis, pixel-driving circuit provided in an embodiment of the present invention is applied to OLED display, passed through When pixel-driving circuit provided in an embodiment of the present invention correspondingly drives OLED D, OLED D operating current and driving tube Td threshold voltage is unrelated, i.e., pixel-driving circuit provided in an embodiment of the present invention can compensate driving switch pipe Td due to threshold value The difference of OLED D operating current caused by voltage drift, brightness constancy when OLED D is luminous was both ensure that, again It ensure that the stability of pixel-driving circuit work.

In addition, it can be seen from above-mentioned analysis, in pixel-driving circuit provided in an embodiment of the present invention, a upper end cycle Afterwards, when next cycle arrives, likewise, first switch pipe T1, the 3rd switch transistor T 3 and driving tube Td are opened, first switch pipe Data-signal Data is exported to the first common node A, driving tube Td and is exported the first power supply potential signal VSS to the 3rd public affairs by T1 Conode P, the 3rd switch transistor T 3 export the first power supply potential signal VSS to the second common node B, storage capacitance C1 voltage Changed in the case where the first common node A current potential and the second common node B current potential change.Therefore, it is of the invention The pixel-driving circuit that embodiment provides further simplify picture without setting the reset unit resetted to storage capacitance C1 The structure of plain drive circuit, meanwhile, do not include in a drive cycle of pixel-driving circuit provided in an embodiment of the present invention multiple The position period, simplify the driving process of pixel-driving circuit.

Furthermore in pixel-driving circuit provided in an embodiment of the present invention, it can be prevented in the compensation period in working cell 4 OLED D lights, and improves the reliability of pixel-driving circuit.

It is worthy of note that pixel-driving circuit of the present embodiment only by taking above-mentioned specific circuit structure as an example to being provided It is introduced, in other embodiments of the invention, the data write unit 1 of pixel-driving circuit, compensating unit 2, driving are single Member 3 and working cell 4 each can also be realized using other structures, will not be described in detail herein.

The embodiment of the present invention also provides a kind of driving method of pixel-driving circuit, applied to as described in above-mentioned embodiment Pixel-driving circuit, the driving method of pixel-driving circuit include multiple drive cycles, and each drive cycle includes:

The period is compensated, scanning signal and data-signal is inputted to data write unit, makes data write unit in the scanning Under the control of signal, data-signal is exported to the first common node;The first power supply potential signal is inputted to driver element, makes drive Moving cell is under the control of the current potential of the second common node by the first power supply potential signal output to the 3rd common node;To benefit Unit input scanning signal is repaid, makes compensating unit under the control of the scanning signal, using the current potential of the 3rd common node, makes the The current potential lifting of two common nodes, make that there is the first potential difference between the second common node and the first common node;

Working hour, scanning signal is inputted to compensating unit, compensating unit is made second under the control of the scanning signal Potential difference between common node and the 3rd common node is maintained at the first potential difference;The first power supply potential is inputted to driver element Signal, make driver element under the control of the current potential of the second common node, generate a drive signal;Work is driven using drive signal Make cell operation.

Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment Divide mutually referring to what each embodiment stressed is the difference with other embodiment.It is real especially for method For applying example, because it is substantially similar to circuit structure embodiment, so describing fairly simple, related part is referring to circuit knot The part explanation of structure embodiment.

The embodiment of the present invention also provides a kind of display device, and above-mentioned display device includes the pixel as described in above-mentioned embodiment Drive circuit.

The display device is same relative to Dominant Facies possessed by prior art with above-mentioned pixel-driving circuit, herein no longer Repeat.

In the description of above-mentioned embodiment, specific features, structure, material or feature can be in any one or more Combined in an appropriate manner in individual embodiment or example.

The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.

Claims (10)

1. a kind of pixel-driving circuit a, it is characterised in that drive cycle of the pixel-driving circuit includes the compensation period And working hour, the pixel-driving circuit include data write unit, compensating unit, driver element, working cell, the first public affairs Conode, the second common node and the 3rd common node;Wherein,
The data write unit connects first common node, and the data write unit is used for:In the compensation period, Receive scanning signal and data-signal, and export the data-signal to described first public under the control of the scanning signal Node;
The compensating unit connects the first common node, second common node and the 3rd common node;It is described Compensating unit is used for:In the compensated stage, the scanning signal is received, and under the control of the scanning signal, using described The current potential of 3rd common node, make the current potential lifting of second common node, make second common node and described first There is the first potential difference between common node;In the working stage, scanning signal is received, and in the control of the scanning signal Under, the potential difference between second common node and the 3rd common node is maintained at first potential difference;
The driver element connects one end of second common node, the 3rd common node and power supply;The driving is single Member is used for:In the compensation period, the first power supply potential signal is received, and under the control of the current potential in second common node By the first power supply potential signal output to the 3rd common node;In the working hour, the first power supply potential letter is received Number, and under the control of the current potential in second common node, generate a drive signal;
The working cell connects the other end of the 3rd common node and the power supply, and the working cell is used for:Institute Working hour is stated, is worked under the driving of the drive signal.
2. pixel-driving circuit according to claim 1, it is characterised in that the data write unit includes first switch Pipe, the control terminal of the first switch pipe receive scanning signal, and the input of the first switch pipe receives the data-signal, The output end of the first switch pipe connects first common node.
3. pixel-driving circuit according to claim 2, it is characterised in that the compensating unit includes:Storage capacitance, with And the second switch pipe and the 3rd switching tube that channel type is opposite;Wherein,
One end of the storage capacitance connects first common node, and the other end connection described second of the storage capacitance is public Conode;
The control terminal of the second switch pipe receives scanning signal, and the input connection the described 3rd of the second switch pipe is public Node, the output end of the second switch pipe connect first common node;In the working hour, the second switch pipe Control terminal receive scanning signal, and opened under the control of the scanning signal;
The control terminal of 3rd switching tube receives scanning signal, and the input connection the described 3rd of the 3rd switching tube is public Node, the output end of the 3rd switching tube connect second common node;In the compensation period, the 3rd switching tube Control terminal receive scanning signal, and opened under the control of the scanning signal.
4. pixel-driving circuit according to claim 3, it is characterised in that the channel type of the first switch pipe and institute The channel type for stating the 3rd switching tube is identical.
5. pixel-driving circuit according to claim 2, it is characterised in that the driver element includes driving tube, described The control terminal of driving tube connects second common node, and the input of the driving tube receives power supply potential signal, the drive The output end of dynamic pipe connects the 3rd common node.
6. pixel-driving circuit according to claim 5, it is characterised in that the control terminal of the driving tube and the driving Threshold voltage between the input of pipe is equal to the threshold value between the control terminal of the driving tube and the output end of the driving tube Voltage.
7. pixel-driving circuit according to claim 5, it is characterised in that the channel type of the driving tube and described the The channel type of one switching tube is opposite.
8. pixel-driving circuit according to claim 1, it is characterised in that the working cell includes:
OLED, the negative electrode of the OLED connect the 3rd common node, the anode connection institute of the OLED The other end of power supply is stated, the OLED is used to light under the driving of the drive signal;
Parasitic capacitance, one end of the parasitic capacitance connect the anode of the OLED, and the other end of the parasitic capacitance connects Connect the negative electrode of the OLED.
9. a kind of driving method of pixel-driving circuit, it is characterised in that applied to the picture as described in claim 1~8 is any Plain drive circuit, the driving method of the pixel-driving circuit include multiple drive cycles, and each drive cycle includes:
The period is compensated, scanning signal and data-signal is inputted to data write unit, makes the data write unit in the scanning Under the control of signal, the data-signal is exported to the first common node;The first power supply potential signal is inputted to driver element, Make the driver element under the control of the current potential of the second common node by the first power supply potential signal output to the 3rd public Node;Scanning signal is inputted to compensating unit, makes the compensating unit under the control of the scanning signal, it is public using the described 3rd The current potential of conode, make the current potential lifting of second common node, make second common node and the described first public section There is the first potential difference between point;
Working hour, scanning signal is inputted to the compensating unit, the compensating unit is made under the control of the scanning signal Potential difference between second common node and the 3rd common node is maintained at first potential difference;To the driving Unit inputs the first power supply potential signal, makes the driver element under the control of the current potential of second common node, generates One drive signal;Utilize drive signal driving working cell work.
10. a kind of display device, it is characterised in that including the pixel-driving circuit as described in claim 1~8 is any.
CN201610998752.0A 2016-11-11 2016-11-11 A kind of pixel-driving circuit and its driving method, display device CN106340268B (en)

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CN104409051A (en) * 2014-12-24 2015-03-11 京东方科技集团股份有限公司 Pixel circuit, organic electroluminescent display panel and display device
CN104933993A (en) * 2015-07-17 2015-09-23 合肥鑫晟光电科技有限公司 Pixel driving circuit and driving method thereof and display device

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Publication number Priority date Publication date Assignee Title
CN103021332A (en) * 2012-12-04 2013-04-03 彩虹(佛山)平板显示有限公司 Driving system for display
CN203366706U (en) * 2013-07-31 2013-12-25 京东方科技集团股份有限公司 Pixel drive circuit and display device
CN104318897A (en) * 2014-11-13 2015-01-28 合肥鑫晟光电科技有限公司 Pixel circuit, organic electroluminescence display panel and display device
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