CN109272932A - Pixel circuit and its driving method, display panel, display device - Google Patents
Pixel circuit and its driving method, display panel, display device Download PDFInfo
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- CN109272932A CN109272932A CN201811448988.2A CN201811448988A CN109272932A CN 109272932 A CN109272932 A CN 109272932A CN 201811448988 A CN201811448988 A CN 201811448988A CN 109272932 A CN109272932 A CN 109272932A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
Abstract
It includes: light-emitting component, driving unit and bias unit that the present invention, which provides a kind of pixel circuit and its driving method, display panel, display device, the pixel circuit,.Driving unit and scan signal line are connect with the anode of light-emitting component, and the cathode of light-emitting component is connect with bias unit；Bias unit includes the control terminal for receiving control signal；Driving unit, under the scanning signal control that scan signal line provides, driving or stopping to drive light-emitting component；Bias unit, for according to the control signal received, when light-emitting component is driven, first voltage is provided to the cathode of light-emitting component, so that light-emitting component is in forward bias condition, and when light-emitting component is not driven, second voltage is provided to the cathode of light-emitting component, so that light-emitting component is in reverse-bias state.Organic material polarization speed inside OLED can be effectively relieved in the present invention, avoid threshold voltage from increasing, to improve OLED luminous efficiency, prolong its service life simultaneously.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of pixel circuit and its driving method, display panel, displays
Device.
Background technique
Organic Light Emitting Diode (Organic Light Emitting Diode, abbreviation OLED) display device has spontaneous
Light, driving voltage be low, frivolous, fast response time and the advantages of high contrast, is widely applied in the field of display.
Current OLED display device when in use, is shone by applying electric field controls OLED between the anode and cathode,
OLED light emitting unit generally comprises organic luminous layer, and the electron transfer layer and hole transport of organic luminous layer opposite sides is arranged in
Layer, there are transport interfaces between organic luminous layer and electron transfer layer and organic luminous layer and hole transmission layer.Work as OLED
When being chronically at direct current biasing state, a large amount of electronics can be assembled at the transport interface of organic luminous layer and electron transfer layer,
A large amount of hole can be assembled at the transport interface of organic luminous layer and hole transmission layer, which can stop subsequent electricity
Son and hole enter organic luminous layer, so that built in field is formed inside OLED, the polarity of the organic material inside OLED
Speed is accelerated therewith, causes the threshold voltage of OLED to increase, greatly reduces the luminous efficiency of OLED, shortens it and uses the longevity
Life.
Summary of the invention
In order to solve the problems, such as at least one mentioned in background technique, the present invention provides a kind of pixel circuit and its driving side
Method, display panel, display device can be effectively relieved organic material polarization speed inside OLED, threshold voltage avoided to increase, from
And OLED luminous efficiency is improved, it prolongs its service life simultaneously.
To achieve the goals above, in a first aspect, the present invention provides a kind of pixel circuit, comprising: light-emitting component, driving are single
Member and bias unit；Wherein,
Driving unit and scan signal line are connect with the anode of light-emitting component, and the cathode and bias unit of light-emitting component connect
It connects；Bias unit includes the control terminal for receiving control signal.
Driving unit, under the scanning signal control that scan signal line provides, driving or stopping to drive light-emitting component.
Bias unit, for the control signal that basis receives, when light-emitting component is driven, to the cathode of light-emitting component
First voltage is provided, so that light-emitting component is in forward bias condition, and when light-emitting component is not driven, to light-emitting component
Cathode provide second voltage so that light-emitting component is in reverse-bias state.
Second aspect, the present invention provide a kind of driving method of pixel circuit, for driving above-mentioned pixel circuit, the drive
Dynamic method includes:
When driving unit drives light-emitting component, control bias unit provides first voltage to the cathode of light-emitting component, with
Light-emitting component is set to be in forward bias condition.
When driving unit does not drive light-emitting component, control bias unit provides second voltage to the cathode of light-emitting component,
So that light-emitting component is in reverse-bias state.
The third aspect, the present invention provide a kind of display panel, comprising: multiple above-mentioned pixel circuits, multiple pixel circuits
It is arranged in array.
Display panel includes multirow pixel circuit, and every row pixel circuit is correspondingly arranged on control signal wire, luminous signal
Line, first switching element and second switch element；Display panel is provided with control shorting stub and luminous shorting stub, controls shorting stub
With luminous shorting stub for providing the control signal of bias unit.
Wherein, the control terminal of the bias unit in each pixel circuit and pixel circuit control signal wire of the row and hair
Optical signal line connection.
First pole of first switching element and the control signal wire of current row connect, and the second pole is connect with control shorting stub；Institute
There is the control electrode of first switching element to be connected to the first control line.
First pole of second switch element and the luminous signal line of current row connect, and the second pole is connect with luminous shorting stub；Institute
There is the control electrode of second switch element to be connected to the second control line.
Fourth aspect, the present invention provide a kind of display device, including such as above-mentioned display panel.
Pixel circuit and its driving method provided by the invention, display panel, display device, by shining in pixel circuit
Bias unit is arranged in the cathode of element, using in bias unit the first feeder ear and the second feeder ear respectively to light-emitting component
Cathode provides voltage value different driving units, so that light-emitting component is alternately in forward bias condition and reverse bias shape
State, be effectively relieved light-emitting component in forward bias condition inside organic material electrons and holes accumulation, to slow down
The polarization speed of organic material, fundamentally avoids the increase of light-emitting component threshold voltage, therefore the hair of OLED can be improved
Light efficiency and service life, to ensure that the display efficiency and service life of display panel and display device.
Construction and its other goals of the invention and beneficial effect of the invention will be in conjunction with the accompanying drawings to preferred reality
Apply the description of example and more obvious and easy to understand.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to make simply to introduce, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structural schematic diagram of the pixel circuit of the prior art；
Fig. 2 is the structural schematic diagram for the pixel circuit that the embodiment of the present invention one provides；
Fig. 3 is that the second power supply of the pixel circuit that the embodiment of the present invention one provides is connected to the structural representation of data signal line
Figure；
Fig. 4 is that the second power supply of the pixel circuit that the embodiment of the present invention one provides is connected to the structural representation of power supply signal line
Figure；
Fig. 5 is the structural schematic diagram of pixel circuit provided by Embodiment 2 of the present invention；
Fig. 6 is that the second power supply of pixel circuit provided by Embodiment 2 of the present invention is connected to the structural representation of luminous signal line
Figure；
Fig. 7 is that the second power supply of pixel circuit provided by Embodiment 2 of the present invention is connected to the structural representation of power supply signal line
Figure；
Fig. 8 is the flow diagram of the driving method for the pixel circuit that the embodiment of the present invention three provides；
Fig. 9 is the structural schematic diagram for the display panel that the embodiment of the present invention four provides.
Description of symbols:
10,10 '-driving units；20,20 '-bias units；
VData-data signal line；VDD-power supply signal line；
VSS-earthing power supply, the first feeder ear；The second feeder ear of VGH '-；
D, D1, D2-light-emitting component；The first energy-storage travelling wave tube of C1-；
Ta, T1 '-switching transistor；Tb, T2 '-driving transistor；
S-scan signal line；S '-control signal wire；
Sn-light-emitting component scan signal line of the row；
Sn-1-light-emitting component lastrow scan signal line；
Sn+1-light-emitting component next line scan signal line；
Vinit-initial voltage signal；EM-luminous signal line；
M1-the first transistor；M2-second transistor；
M3-third transistor；The 4th transistor of M4-；
The 5th transistor of M5-；The 6th transistor of M6-；
The 7th transistor of M7-；The first controlled member of M8-；
The second controlled member of M9-；The second energy-storage travelling wave tube of C2-；
TA-first switching element；TB-second switch element；
The first control line of SW1-；The second control line of SW2-；
L1-control shorting stub；L2-shines shorting stub；
VSD, VDS- current controling end.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the preferred embodiment of the present invention
In attached drawing, technical solution in the embodiment of the present invention is further described in more detail.In the accompanying drawings, identical from beginning to end or
Similar label indicates same or similar component or component with the same or similar functions.Described embodiment is this hair
Bright a part of the embodiment, instead of all the embodiments.The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to
It is used to explain the present invention, and is not considered as limiting the invention.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
The embodiment of the present invention is described in detail with reference to the accompanying drawing.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " coupling " should broadly understood, for example, can make fixed coupling, be also possible to indirectly connected through an intermediary, can be with
It is the interaction relationship of the connection or two elements inside two elements.For the ordinary skill in the art,
The specific meanings of the above terms in the present invention can be understood according to specific conditions.
Fig. 1 is the structural schematic diagram of the pixel circuit of the prior art, is shone based on OLED in current OLED display device
Unit generally comprises organic luminous layer, and the electron transfer layer and hole transmission layer of organic luminous layer opposite sides is arranged in, is having
There are transport interfaces between machine luminescent layer and electron transfer layer and organic luminous layer and hole transmission layer.In OLED use process
In, since long-time is in direct current biasing state, can assemble at the transport interface of organic luminous layer and electron transfer layer a large amount of
Electronics, a large amount of hole can be assembled at the transport interface of organic luminous layer and hole transmission layer, which can hinder
Gear Subsequent electronic and hole enter organic luminous layer, so that built in field is formed inside OLED, the organic material inside OLED
Polarity speed accelerate therewith, cause the threshold voltage of OLED to increase, greatly reduce the luminous efficiency of OLED, shorten it
Service life.
In order to solve the above technical problems, pixel circuit as shown in Figure 1 is generally used, which is based on 2T1C
Circuit structure, specifically include storage capacitance C, at least two light-emitting component D1 and D2, switching transistor T1 ' and driving transistor
T2 ', wherein the first pole connection of switching transistor T1 ' drives the control electrode of transistor T2 ' and the first pole of storage capacitance C, the
Two poles connect data signal line VData.The second pole of storage capacitance C is connected to earthing power supply VSS.Drive the of transistor T2 '
One pole connects power supply signal line VDD, and the second pole is separately connected the anode of light-emitting component D1 and D2, the cathode of light-emitting component D1 and D2
It is respectively connected to different current controling end VSDH and VDS.The course of work of pixel circuit can be through the luminous member of independent control
Part D1 and D2, both make in turn in luminance, and so as to slow down single light-emitting component D1 or D2, to be chronically at direct current inclined
Luminance is set, to slow down organic material polarization speed, avoids OLED threshold voltage from increasing, improves luminous efficiency, same to time delay
Long life.However above-mentioned pixel circuit is only capable of alleviating the increase of threshold voltage, and can not thoroughly solve the organic material of OLED
The polarization problem of material, OLED still will continue to the increased problem of threshold voltage occur after prolonged use, influence shining for OLED
Efficiency and service life.
Embodiment one
Fig. 2 is the structural schematic diagram for the pixel circuit that the embodiment of the present invention one provides.Fig. 3 is that the embodiment of the present invention one provides
The second power supply of pixel circuit be connected to the structural schematic diagram of data signal line.Fig. 4 is the picture that the embodiment of the present invention one provides
Second power supply of plain circuit is connected to the structural schematic diagram of power supply signal line.
Shown in referring to Figure 2 to Figure 4, and, the embodiment of the present invention one is provided based on above-mentioned discovery
Following pixel circuit, it is intended to alleviate organic material polarization speed inside OLED, threshold voltage is avoided to increase, improve OLED and shine
Efficiency prolongs its service life simultaneously.
Specifically, the pixel circuit includes: light-emitting component D, driving unit 10 and bias unit 20；Wherein,
Driving unit 10 and scan signal line S are connect with the anode of light-emitting component D, the cathode of light-emitting component D and biasing
Unit 20 connects；Bias unit 20 includes the control terminal for receiving control signal.
Driving unit 10, under the scanning signal control that scan signal line S is provided, driving or stopping to drive the member that shines
Part D.
Bias unit 20, for the control signal that basis receives, when light-emitting component D is driven, to light-emitting component D's
Cathode provides first voltage, so that light-emitting component D is in forward bias condition, and when light-emitting component D is not driven, Xiang Fa
The cathode of optical element D provides second voltage, so that light-emitting component D is in reverse-bias state.
It should be noted that pixel circuit provided in this embodiment is at work, driving unit 10 is used to be light-emitting component D
It provides for luminous driving voltage, which acts predominantly on the anode of light-emitting component D.Bias unit 20 is connected to hair
The cathode of optical element D is also used for providing to light-emitting component D for luminous driving voltage, and light-emitting component D is in 10 He of driving unit
Under the collective effect of the driving unit 10 of bias unit 20, reverse bias shape can be shone or is in forward bias condition
State.
Wherein, which can provide in the working sequence of light-emitting component D to the cathode of light-emitting component D different
First voltage and second voltage, and first voltage and second voltage be one is selected to be applied on cathode, therefore first voltage and
It will not generate and interfere with each other between second voltage.Based in pixel circuit provided in this embodiment, can light-emitting component D not by
When driving, the second voltage for being at reverse-bias state is provided to the cathode of light-emitting component D, light-emitting component D can be eliminated
The accumulation of the electrons and holes of organic material inside in forward bias condition, thus alleviate the polarization speed of organic material,
The increase of light-emitting component D threshold voltage is fundamentally avoided, therefore the luminous efficiency and service life of OLED can be improved.
And it is pointed out that reverse bias provided in this embodiment can be in the working sequence of light-emitting component D
Completed in the timing slack of middle forward bias process so that light-emitting component D be alternately in forward bias condition and it is reversed partially
State is set, sufficiently alleviates OLED and is formed by organic material polarization phenomena under forward bias condition.
Further, the bias unit 20 of the pixel circuit may include: the first controlled member M8 and the second controlled member
M9；The control terminal of bias unit 20 includes the control electrode of the first controlled member M8 and the control electrode of the second controlled member M9；Wherein,
The both ends of first controlled member M8 be respectively connected to the cathode of light-emitting component D and for providing first voltage first
Feeder ear VSS；The both ends of second controlled member M9 be respectively connected to the cathode of light-emitting component D and for providing second voltage
Two feeder ear VGH '.
The control electrode of first controlled member M8, for receiving first control signal；First controlled member M8, for according to the
One control signal, is connected, and the shutdown when light-emitting component D is not driven when light-emitting component D is driven.
The control electrode of second controlled member M9, for receiving second control signal；Second controlled member M9, for according to the
Two control signals, turn off, and the conducting when light-emitting component D is not driven when light-emitting component D is driven.
It should be noted that the course of work of bias unit 20 provided in this embodiment can be referring to shown in Fig. 2, when
When light-emitting component D is driven, the control electrode of the first controlled member M8 is connected after receiving first control signal, the second controlled member M9
Control electrode receive second control signal after disconnect so that light-emitting component D cathode connect the first feeder ear VSS, as one kind
Achievable embodiment, first feeder ear are earthing power supply VSS, and light-emitting component D is single in the first feeder ear VSS and driving
Normal luminous under the driving voltage collective effect of member 10, the driving electricity that driving unit 10 is provided to the anode of light-emitting component D at this time
Pressure is higher than the driving voltage that the first feeder ear VSS is provided to the cathode of light-emitting component D, therefore light-emitting component D internal circulation is
Forward current, light-emitting component D normal luminous.
And when light-emitting component D is not driven, the first controlled member M8 control electrode disconnects after receiving first control signal, the
The control electrode of two controlled member M9 is connected after receiving second control signal, so that the cathode of light-emitting component D connects the second feeder ear
VGH ', second feeder ear VGH ' can be external power supply.At this point, the anode of light-emitting component D or same reception driving unit
10 driving voltage, and cathode then receives the driving voltage of the second feeder ear VGH ', the driving electricity that the second feeder ear VGH ' is provided
The voltage value of pressure is higher than the driving voltage of driving unit 10, therefore light-emitting component D internal circulation is reverse current, is shone at this time
Element D is in reverse-bias state.
As a kind of achievable embodiment, the second feeder ear VGH ' be can connect to data signal line VData.Fig. 3
The equivalent circuit diagram that as the second feeder ear VGH ' is connected to data signal line VData.
As another achievable embodiment, the second feeder ear VGH ' is connected to power supply signal line VDD.It needs to illustrate
, Fig. 4 is that the second feeder ear VGH ' is connected to the equivalent circuit diagram under power supply signal line VDD state, wherein the second feeder ear
The connection type of VGH ' can be the power supply signal line that is connected in the driving unit 10 direct or indirect by connecting line
VDD, or a power supply signal line VDD is separately provided in bias unit 20, and connect with the second feeder ear VGH '.In reality
In use, above two mode is able to achieve, user can be set as needed, the present embodiment to this and it is without restriction.
Second feeder ear VGH ' is connected to data signal line VData or power supply signal line VDD, drive can be made full use of
Voltage in moving cell 10 in existing signal wire and signal wire, as the driving voltage of bias unit 20, thus greatly
The structure for simplifying pixel circuit greatly, improves the service efficiency of pixel circuit.
Specifically, the driving unit 10 of the pixel circuit may include: switching transistor Ta, the first energy-storage travelling wave tube C1 and drive
Dynamic transistor Tb.
The first pole of switching transistor Ta is connect with data signal line VData, the second pole and first of switching transistor Ta
The first pole of energy-storage travelling wave tube C1 connects, and the control electrode of switching transistor Ta is connect with scan signal line S.
The first pole of driving transistor Tb is connect with power supply signal line VDD, drives the second pole of transistor Tb and the member that shines
The anode of part D connects, and the control electrode of driving transistor Tb is connect with the second pole of switching transistor Ta.
The second pole of first energy-storage travelling wave tube C1 is connect with earthing power supply VSS.
It should be noted that the driving unit 10 of the pixel circuit can select common 2T1C knot in OLED pixel circuit
Structure includes two thin film transistor (TFT)s and a first energy-storage travelling wave tube C1 that is, in driving unit 10.The driving unit 10 at work,
When the signal that switching transistor Ta is scanned signal wire S is chosen, switching transistor Ta is connected, the number on data signal line VData
It is passed to according to voltage in the control electrode of driving transistor Tb, so that driving transistor Tb conducting, while to the first energy-storage travelling wave tube
C1 charges.Driving transistor Tb conducting power supply signal line VDD is connect with the anode of light-emitting component D, the cathode of light-emitting component D
It is connect with earthing power supply VSS, light-emitting component D normal luminous.
The first energy-storage travelling wave tube C1 in the driving unit 10 can be held when the supply voltage of power supply signal line VDD disappears
Continue and provide steady and sustained driving voltage for light-emitting component D, to guarantee the normal luminous of light-emitting component D.
Bias unit is arranged by the cathode in light-emitting component, using inclined in the pixel circuit that the embodiment of the present invention one provides
The first feeder ear and the second feeder ear set in unit provide voltage value different driving units to the cathode of light-emitting component respectively,
So that light-emitting component is alternately in forward bias condition and reverse-bias state, light-emitting component is effectively relieved in forward bias
The accumulation of the electrons and holes of organic material inside when state is fundamentally kept away to slow down the polarization speed of organic material
The increase of light-emitting component threshold voltage is exempted from, therefore the luminous efficiency and service life of OLED can be improved.
Embodiment two
Fig. 5 is the structural schematic diagram of pixel circuit provided by Embodiment 2 of the present invention.Fig. 6 be second embodiment of the present invention provides
The second power supply of pixel circuit be connected to the structural schematic diagram of luminous signal line.Fig. 7 is picture provided by Embodiment 2 of the present invention
Second power supply of plain circuit is connected to the structural schematic diagram of power supply signal line.
Referring to shown in Fig. 5 to Fig. 7, on the basis of the above embodiment 1, the embodiment of the present invention two also provides another knot
The pixel circuit of structure, embodiment one are, the driving unit 10 ' of pixel circuit compared with embodiment two in place of the difference of the two
Structure it is different, in embodiment two by the 2TIC circuit structure of the driving unit 10 ' in embodiment one be changed to 7T1C electricity
Line structure.
Specifically, the driving unit 10 ' of the pixel circuit includes the first transistor M1, second transistor M2, third crystal
Pipe M3, the 4th transistor M4, the 5th transistor M5, the 6th transistor M6, the 7th transistor M7 and the second energy-storage travelling wave tube C2.
The scan signal line S and second transistor M2 of pixel column where the control electrode and light-emitting component D of the first transistor M1
Control electrode connection, the first pole of the first transistor M1 and the first pole of the 6th transistor M6 and the second pole of the 7th transistor M7
Connection, the second pole of the first transistor M1 is connect with the second pole of the control electrode of the 7th transistor M7 and the second energy-storage travelling wave tube C2.
The first pole of second transistor M2 is connect with data signal line VData, the second pole and the 7th of second transistor M2
The first pole of transistor M7 is connected with the first pole of third transistor M3.
The control electrode of third transistor M3 is connect with the control electrode of the 6th transistor M6, the first pole of third transistor M3 with
The first pole of 7th transistor M7 connects, and the second pole of third transistor M3 is connect with the first pole of the second energy-storage travelling wave tube C2.
The control electrode of 4th transistor M4 is connect with the scan signal line Sn+1 of next pixel column, and the of the 4th transistor M4
One pole is connect with the anode of light-emitting component D, the second pole of the 4th transistor M4 and initial voltage signal Vinit line and the 5th crystal
The second pole of pipe M5 connects.
The control electrode of 5th transistor M5 is connect with the scan signal line Sn-1 of a upper pixel column, and the of the 5th transistor M5
One pole is connect with the second pole of the control electrode of the 7th transistor M7 and the second energy-storage travelling wave tube C2, the second pole of the 5th transistor M5 with
The connection of initial voltage signal Vinit line.
The control electrode of 6th transistor M6 is connect with luminous signal line EM, the first pole of the 6th transistor M6 and the 7th crystal
The second pole of pipe M7 connects, and the second pole of the 6th transistor M6 is connect with the first pole of the 4th transistor M4；
The first pole of second energy-storage travelling wave tube C2 is connect with power supply signal line VDD.
It should be noted that the driving unit 10 ' of pixel circuit provided in this embodiment has been selected in OLED pixel circuit
Common 7T1C structure includes seven thin film transistor (TFT)s and a second energy-storage travelling wave tube C2 that is, in driving unit 10 '.The driving list
The working sequence process of member 10 ' generally includes initial phase, charging stage and read-write light emitting phase.
Wherein, in initial phase, the scan signal line Sn-1 of light-emitting component lastrow provides low voltage signal, shines
Element scan signal line Sn of the row, luminous signal line EM and data signal line VData provide high voltage signal.At this time
Four transistor M4 and the 5th transistor M5 conducting, it is luminous that reference voltage, which is filled with light-emitting component D anode and the second energy-storage travelling wave tube C2,
The anode of element D provides negative voltage, empties the voltage that prestores of its inside, completes initialization.
In the charging stage, the scan signal line Sn-1 and luminous signal line EM of light-emitting component lastrow provide high voltage letter
Number, light-emitting component scan signal line Sn of the row and data signal line VData provide low voltage signal.Second transistor at this time
M2, the 5th transistor M5 and the 7th transistor M7 conducting, the voltage of data signal line VData are filled in the second energy-storage travelling wave tube C2,
Complete the charging process of the second energy-storage travelling wave tube C2.
Believe in the scanning of read-write light emitting phase, the scan signal line Sn-1, light-emitting component lastrow of light-emitting component lastrow
Number line Sn-1 and data signal line VData provides high voltage signal, the low voltage signal that luminous signal line EM is provided.At this time
Three transistor M3, the 6th transistor M6 and the 7th transistor M7 conducting, power supply signal line VDD pass through third transistor M3, the 6th
Transistor M6 and the 7th transistor M7 provides driving voltage to the anode of light-emitting component D, makes its normal luminous.
The pixel circuit of the 7T1C has the threshold voltage compensation process of light-emitting component D in luminescence process, therefore can
Guarantee the luminous uniformity of light-emitting component D.
As a kind of achievable embodiment, the control electrode of the first controlled member M8 is connected to luminous signal line EM.This
The luminous signal that the setting of sample can use luminous signal line EM controls being turned on or off for the second controlled member M9.Fig. 6 is
The equivalent circuit diagram when control electrode of first controlled member M8 is connect with luminous signal line EM.
As a kind of achievable embodiment, the second feeder ear VGH ' is connected to luminous signal line EM.As another kind
Achievable embodiment, the second feeder ear VGH ' may also connect to power supply signal line VDD.Such setting can use hair
Optical signal line EM or power supply signal line VDD be the second feeder ear VGH ' provide driving voltage, Fig. 6 be the second feeder ear VGH ' with
Equivalent circuit diagram when the EM connection of luminous signal line, Fig. 7 are equivalent when the second feeder ear VGH ' is connect with power supply signal line VDD
Circuit diagram.
The connection type of above-mentioned first controlled member M8 and the second feeder ear VGH ' can make full use of in driving unit 10 '
Voltage in existing signal wire and signal wire effectively simplifies the structure of pixel circuit, to improve the use of pixel circuit
Efficiency.
Further, the first controlled member M8 and the second controlled member M9 is MOS transistor, and the first controlled member M8 is
PMOS transistor.
Control electrode based on the first controlled member M8 can be connect with luminous signal line EM, and when light-emitting component D is being sent out
Light time, the first controlled member M8 is in the conductive state, and luminous signal line EM provides low voltage signal herein, therefore, in order to ensure that first
The conducting of controlled member M8 can set PMOS transistor for the first controlled member M8.And the second controlled member M9 can root
According to needing to be set as PMOS transistor or NMOS transistor, the present embodiment to this and it is without restriction.
The bias unit 20 ' of the present embodiment can be identical as 20 structure of bias unit of embodiment one, and course of work class
Seemingly.
Other technical characteristics are the same as example 1, and can reach identical technical effect, and this is no longer going to repeat them.
Bias unit is arranged by the cathode in light-emitting component, using inclined in pixel circuit provided by Embodiment 2 of the present invention
The first feeder ear and the second feeder ear set in unit provide voltage value different driving units to the cathode of light-emitting component respectively,
So that light-emitting component is alternately in forward bias condition and reverse-bias state, light-emitting component is effectively relieved in forward bias
The accumulation of the electrons and holes of organic material inside when state is fundamentally kept away to slow down the polarization speed of organic material
The increase of light-emitting component threshold voltage is exempted from, therefore the luminous efficiency and service life of OLED can be improved.
Embodiment three
Fig. 8 is the flow diagram of the driving method for the pixel circuit that the embodiment of the present invention three provides.Referring to shown in Fig. 8,
On the basis of above-described embodiment one and embodiment two, the embodiment of the present invention three provides a kind of driving method of pixel circuit, uses
Pixel circuit in driving embodiment one or embodiment two.
Specifically, driving method is included in light-emitting component D when being in luminance, following steps 1 can be executed: driven
When moving cell drives light-emitting component, control bias unit provides first voltage to the cathode of light-emitting component, so that at light-emitting component
In forward bias condition.
It should be noted that driving method provided in this embodiment can be used in above-mentioned pixel circuit when in use,
When needing light-emitting component D to work, it can control bias unit 20 to the cathode of light-emitting component D and first voltage be provided, specifically
Realization process can be, and the cathode of light-emitting component D is connect by the first controlled member M8 with the first feeder ear VSS, control this
One controlled member M8 conducting, the cathode of light-emitting component D receives the first voltage of the first feeder ear VSS, based on the first voltage
Voltage value is lower than the driving voltage that driving unit 10 is provided to light-emitting component D anode, therefore positive electricity is flowed through inside light-emitting component D
Stream completes normal shine.
And in the lighting timings of light-emitting component D, light-emitting component D non-luminous stage can execute following steps 2:
When driving unit does not drive light-emitting component, control bias unit provides second voltage to the cathode of light-emitting component, so that the member that shines
Part is in reverse-bias state.
It should be noted that the specific implementation process that light-emitting component D is in reverse-bias state can be, light-emitting component D
Cathode simultaneously can connect by the second controlled member M9 with the second feeder ear VGH ', at this time utilize the first controlled member M8 break
The connection of optical element D cathode and the first feeder ear VSS is developed, and utilizes the second controllable original cost that light-emitting component D cathode and the is connected
The connection of two feeder ear VGH ', to realize the second voltage provided to the cathode of light-emitting component D.
The voltage value of the second voltage is less than the driving voltage that driving unit 10 is provided to the anode of light-emitting component D, therefore
Negative pressure electric current is flowed through inside light-emitting component D, effectively eliminates light-emitting component D in luminance using the negative current, inside has
The electrode accumulated at machine material and hole avoid OLED threshold voltage from increasing, improve to slow down organic material polarization speed
Luminous efficiency prolongs the service life simultaneously.
Other technical characteristics are identical as embodiment one or embodiment two, and can reach identical technical effect, herein no longer
It repeats one by one.
The driving method for the pixel circuit that the embodiment of the present invention three provides, it is single by the cathode setting biasing in light-emitting component
Member, using in bias unit the first feeder ear and the second feeder ear respectively to the cathode of light-emitting component provide voltage value it is different
Light-emitting component is effectively relieved so that light-emitting component is alternately in forward bias condition and reverse-bias state in driving unit
The accumulation of the electrons and holes of organic material inside in forward bias condition, thus slow down the polarization speed of organic material,
The increase of light-emitting component threshold voltage is fundamentally avoided, therefore the luminous efficiency and service life of OLED can be improved.
Example IV
Fig. 9 is the structural schematic diagram for the display panel that the embodiment of the present invention four provides.Referring to shown in Fig. 9, in above-mentioned implementation
On the basis of example one to embodiment three, the embodiment of the present invention four also provides a kind of display panel.
Specifically, the display panel includes: multiple above-mentioned pixel circuits, multiple pixel circuits are arranged in array.
Display panel includes multirow pixel circuit, and every row pixel circuit is correspondingly arranged on control signal wire S ', shine letter
Number line EM, first switching element TA and second switch element TB；Display panel is provided with control shorting stub L1 and luminous shorting stub
L2, control shorting stub L1 and luminous shorting stub L2 be used for bias unit 20 or 20 is provided ' control signal.
Wherein, the control terminal of the bias unit 20 or 20 ' in each pixel circuit and pixel circuit control of the row
Signal wire S ' is connected with luminous signal line EM.
The first pole of first switching element TA and the control signal wire S ' connection of current row, the second pole and control shorting stub L1 connect
It connects；The control electrode of all first switching element TA is connected to the first control line SW1.
The first pole of second switch element TB and the luminous signal line EM connection of current row, the second pole and luminous shorting stub L2 connect
It connects；The control electrode of all second switch element TB is connected to the second control line SW2.
It should be noted that may include multiple pixel lists being arranged in array in display panel provided in this embodiment
A pixel circuit can be set in member, each pixel unit, therefore with multiple pixel electricity being independently arranged in display panel
Road, in order to simultaneously multiple pixel circuits are controlled, by multiple pixel circuit according to its arrangement mode be divided into multirow or
Person's multiple row is illustrated in the present embodiment by taking row subregion as an example, and in actual use, the set-up mode of the present embodiment is equally applicable
In the mode of column subregion, the present embodiment to this and it is without restriction.
When by multiple pixel circuits according to row subregion, which includes multirow pixel circuit group, every row pixel electricity
Lu Zuzhong has including multiple pixel circuits.
The control shorting stub L1 of current row, multirow control are wherein all connected to the control signal wire S ' of the pixel circuit of a line
Shorting stub L1 processed is interconnected, and passes through first switch between the every row control shorting stub L1 and control signal wire S ' of current row
Element TA control connection, to control the conducting and disconnection of the two.The control electrode of multiple first switching element TA on display panel
It is connect with the first control line SW1, so that the first control line SW1 can be to multiple first switching elements in display panel work
TA sends control signal, controls multiple first switching element TA and is turned on or off, the control shorting stub L1 of multirow and corresponding row
Control signal wire S ' successive conductive or disconnection, to control the process that each pixel unit receives control signal.
Similarly, the luminous shorting stub L2 of current row is all connected to the luminous signal line EM of the pixel circuit of a line, it is more
The luminous shorting stub L2 of row is interconnected, and passes through second between the luminous shorting stub L2 and luminous signal line EM of current row of every row
Switch element TB control connection, to control the conducting and disconnection of the two.The control of multiple second switch element TB on display panel
System is extremely connect with the second control line SW2, so that the second control line SW2 can be to multiple second switches in display panel work
Element TB sends luminous signal, controls multiple second switch element TB and is turned on or off, the luminous shorting stub L2 and correspondence of multirow
Capable luminous signal line EM successive conductive or disconnection, to control the process that each pixel unit receives luminous signal.
By above-mentioned control structure and control process, multiple pixel units can be controlled the display panel simultaneously and receive control
The process of signal and luminous signal processed is effectively simplified to control the luminescence process and reverse bias of its forward bias
The circuit structure of display panel improves the control efficiency of display panel.
Other technical characteristics are identical to embodiment three as embodiment one, and can reach identical technical effect, herein no longer
It repeats one by one.
The display panel that the embodiment of the present invention four provides, includes above-mentioned pixel circuit, the pixel circuit is by sending out
Bias unit is arranged in the cathode of optical element, using in bias unit the first feeder ear and the second feeder ear respectively to light-emitting component
Cathode provide voltage value different driving unit so that light-emitting component is alternately in forward bias condition and reverse bias
State, be effectively relieved light-emitting component in forward bias condition inside organic material electrons and holes accumulation, to subtract
The polarization speed of slow organic material, fundamentally avoids the increase of light-emitting component threshold voltage, therefore can be improved OLED's
Luminous efficiency and service life, to ensure that the display efficiency and service life of display panel, and the company of the display panel
The mode of connecing can effectively simplify its circuit structure, improve the control efficiency of display panel.
Embodiment five
On the basis of above-described embodiment one to example IV, the embodiment of the present invention five provides a kind of display device, this reality
The display device for applying example offer can be the TV for including above-mentioned display panel, digital camera, mobile phone, tablet computer, intelligent hand
Any product having a display function such as table, e-book, navigator or component.
Other technical characteristics are identical to example IV as embodiment one, and can reach identical technical effect, herein no longer
It repeats one by one.
The display device that the embodiment of the present invention five provides, includes above-mentioned pixel circuit, the pixel circuit is by sending out
Bias unit is arranged in the cathode of optical element, using in bias unit the first feeder ear and the second feeder ear respectively to light-emitting component
Cathode provide voltage value different driving unit so that light-emitting component is alternately in forward bias condition and reverse bias
State, be effectively relieved light-emitting component in forward bias condition inside organic material electrons and holes accumulation, to subtract
The polarization speed of slow organic material, fundamentally avoids the increase of light-emitting component threshold voltage, therefore can be improved OLED's
Luminous efficiency and service life, to ensure that the display efficiency and service life of display device.
The description and claims of this application and term " first ", " second ", " third ", " in above-mentioned attached drawing
The (if present)s such as four " are to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should manage
The data that solution uses in this way are interchangeable under appropriate circumstances, so that embodiments herein described herein for example can be to remove
Sequence other than those of illustrating or describe herein is implemented.In addition, term " includes " and " having " and theirs is any
Deformation, it is intended that cover it is non-exclusive include, for example, containing the process, method of a series of steps or units, system, production
Product or equipment those of are not necessarily limited to be clearly listed step or unit, but may include be not clearly listed or for this
A little process, methods, the other step or units of product or equipment inherently.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
Technical solution documented by foregoing embodiments can so be studied and be changed, or some or all of the technical features are carried out
Equivalent replacement；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution various embodiments of the present invention technical side
The range of case.
Claims (10)
1. a kind of pixel circuit characterized by comprising light-emitting component, driving unit and bias unit；Wherein,
The driving unit and scan signal line are connect with the anode of the light-emitting component, the cathode of the light-emitting component and institute
State bias unit connection；The bias unit includes the control terminal for receiving control signal；
The driving unit, for driving or stopping described in driving under the scanning signal control that the scan signal line provides
Light-emitting component；
The bias unit, for the control signal that basis receives, when the light-emitting component is driven, to the luminous member
The cathode of part provides first voltage so that the light-emitting component is in forward bias condition, and the light-emitting component not by
When driving, second voltage is provided to the cathode of the light-emitting component, so that the light-emitting component is in reverse-bias state.
2. pixel circuit according to claim 1, which is characterized in that the bias unit include: the first controlled member and
Second controlled member；The control terminal of the bias unit includes the control electrode and the second controllable member of first controlled member
The control electrode of part；Wherein,
The both ends of first controlled member are respectively connected to the cathode of the light-emitting component and are used to provide the described first voltage
The first feeder ear；The both ends of second controlled member are respectively connected to the cathode of the light-emitting component and are used to provide the described
Second feeder ear of second voltage；
The control electrode of first controlled member, for receiving first control signal；First controlled member, for according to institute
First control signal is stated, is connected when the light-emitting component is driven, and the shutdown when the light-emitting component is not driven；
The control electrode of second controlled member, for receiving second control signal；Second controlled member, for according to institute
Second control signal is stated, is turned off when the light-emitting component is driven, and the conducting when the light-emitting component is not driven.
3. pixel circuit according to claim 2, which is characterized in that first feeder ear is connected to earthing power supply；Institute
It states the second feeder ear and is connected to power supply signal line.
4. pixel circuit according to claim 2 or 3, which is characterized in that first controlled member and described second can
Control element is MOS transistor, it is preferred that first controlled member is PMOS transistor.
5. pixel circuit according to claim 4, which is characterized in that the driving unit includes switching transistor, and first
Energy-storage travelling wave tube and driving transistor；
First pole of the switching transistor is connect with data signal line, the second pole of the switching transistor and first storage
The first pole connection of energy element, the control electrode of the switching transistor are connect with the scan signal line；
First pole of the driving transistor is connect with power supply signal line, the second pole of the driving transistor and the luminous member
The anode of part connects, and the control electrode of the driving transistor is connect with the second pole of the switching transistor；
Second pole of first energy-storage travelling wave tube is connect with earthing power supply.
6. pixel circuit according to claim 4, which is characterized in that the driving unit includes the first transistor, second
Transistor, third transistor, the 4th transistor, the 5th transistor, the 6th transistor, the 7th transistor and the second energy-storage travelling wave tube；
The scan signal line and second crystal of pixel column where the control electrode of the first transistor and the light-emitting component
The control electrode of pipe connects, the first pole and the 7th transistor of the first pole of the first transistor and the 6th transistor
The connection of the second pole, the control electrode of the second pole of the first transistor and the 7th transistor and second energy-storage travelling wave tube
The second pole connection；
First pole of the second transistor is connect with data signal line, the second pole of the second transistor and the 7th crystalline substance
First pole of body pipe is connected with the first pole of the third transistor；
The control electrode of the third transistor is connect with the control electrode of the 6th transistor, the first pole of the third transistor
It is connect with the first pole of the 7th transistor, the first pole of the second pole of the third transistor and second energy-storage travelling wave tube
Connection；
The control electrode of 4th transistor is connect with the scan signal line of next pixel column, the first pole of the 4th transistor
It is connect with the anode of the light-emitting component, the second pole of the 4th transistor and initial voltage signal line and the 5th crystal
Second pole of pipe connects；
The control electrode of 5th transistor is connect with the scan signal line of a upper pixel column, the first pole of the 5th transistor
It is connect with the second pole of the control electrode of the 7th transistor and second energy-storage travelling wave tube, the second pole of the 5th transistor
It is connect with the initial voltage signal line；
The control electrode of 6th transistor is connect with luminous signal line, the first pole of the 6th transistor and the 7th crystalline substance
Second pole of body pipe connects, and the second pole of the 6th transistor is connect with the first pole of the 4th transistor；
First pole of second energy-storage travelling wave tube is connect with power supply signal line.
7. pixel circuit according to claim 6, which is characterized in that the control electrode of first controlled member is connected to institute
State luminous signal line；Second feeder ear is connected to the luminous signal line.
8. a kind of driving method of pixel circuit, which is characterized in that for driving pixel of any of claims 1-7
Circuit, the driving method include:
When driving unit drives light-emitting component, control bias unit provides first voltage to the cathode of the light-emitting component, with
The light-emitting component is set to be in forward bias condition；
When driving unit does not drive light-emitting component, control bias unit provides second voltage to the cathode of the light-emitting component,
So that the light-emitting component is in reverse-bias state.
9. a kind of display panel characterized by comprising multiple such as pixel circuit of any of claims 1-7, institute
Multiple pixel circuits are stated to be arranged in array；
The display panel includes pixel circuit described in multirow, and every row pixel circuit is correspondingly arranged on control signal wire, shines
Signal wire, first switching element and second switch element；The display panel is provided with control shorting stub and luminous shorting stub, institute
Control shorting stub and the luminous shorting stub are stated for providing the control signal of bias unit；
Wherein, the control terminal of the bias unit in each pixel circuit and pixel circuit control of the row are believed
Number line is connected with luminous signal line；
First pole of the first switching element and the control signal wire of current row connect, and the second pole and the control shorting stub connect
It connects；The control electrode of all first switching elements is connected to the first control line；
First pole of the second switch element and the luminous signal line of current row connect, and the second pole and the luminous shorting stub connect
It connects；The control electrode of all second switch elements is connected to the second control line.
10. a kind of display device, which is characterized in that including display panel as claimed in claim 9.
Priority Applications (1)
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| CN201811448988.2A CN109272932A (en) | 2018-11-28 | 2018-11-28 | Pixel circuit and its driving method, display panel, display device |
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Application publication date: 20190125 |