CN109584804A - Pixel circuit and its driving method, display device - Google Patents
Pixel circuit and its driving method, display device Download PDFInfo
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- CN109584804A CN109584804A CN201910017114.XA CN201910017114A CN109584804A CN 109584804 A CN109584804 A CN 109584804A CN 201910017114 A CN201910017114 A CN 201910017114A CN 109584804 A CN109584804 A CN 109584804A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000003990 capacitor Substances 0.000 claims description 86
- 239000013078 crystal Substances 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 8
- 230000003760 hair shine Effects 0.000 description 7
- 229920001621 AMOLED Polymers 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 241000208340 Araliaceae Species 0.000 description 3
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 3
- 235000003140 Panax quinquefolius Nutrition 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 235000008434 ginseng Nutrition 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 3
- 238000005070 sampling Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 1
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- 229920005591 polysilicon Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
-
- 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
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- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The embodiment of the invention discloses a kind of pixel circuit and its driving methods, display device.The pixel circuit includes: data write-in sub-circuit, initialization sub-circuit, light emitting control sub-circuit, drive sub-circuits and luminous sub-circuit；Data write-in sub-circuit is connect with the first scanning signal, data-signal and drive sub-circuits respectively；Initialization sub-circuit is connect with the second scanning signal, initializing signal, light emitting control sub-circuit and drive sub-circuits respectively；Light emitting control sub-circuit is connect with supply voltage, control signal, initialization sub-circuit and drive sub-circuits respectively；Drive sub-circuits are connect with data write-in sub-circuit, initialization sub-circuit, light emitting control sub-circuit and luminous sub-circuit respectively；Luminous sub-circuit is connect with drive sub-circuits and common voltage respectively.The pixel circuit and its driving method of the embodiment of the present invention, display device can guarantee the homogeneity and uniform display of brightness.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of pixel circuits and its driving method, display device.
Background technique
Active-matrix Organic Light Emitting Diode (Active Matrix Organic Light Emitting Diode,
AMOLED display high-resolution and large-sized requirement) be can satisfy, application is more and more extensive.
It is to be produced by thin film transistor (TFT) (Thin Film Transistor, TFT) in saturation state that AMOLED, which can shine,
Raw driving current simultaneously drives light-emitting component Organic Light Emitting Diode (Organic Light Emitting Diode, OLED) to send out
Light, OLED light emission luminance is directly proportional with the size for the driving current for being supplied to OLED device, therefore in order to realize optimal display effect
Fruit, needs biggish driving current, and low temperature polycrystalline silicon be due to that can provide higher electron mobility, therefore AMOLED shows skill
More selection low temperature polycrystalline silicon makes TFT in art.
In most basic 2T1C pixel circuit, the size and driving TFT threshold voltage V of OLED driving currentthIt is related, and
Low temperature polysilicon process is immature, even same technological parameter, the V of the driving TFT producedthAlso there is biggish difference,
So that the V of the driving TFT at array substrate different locationthDifference, and then the driving current that will lead to OLED is in different size, battle array
Brightness at column substrate different location also just generates difference, and display is uneven.
Summary of the invention
The embodiment of the present invention provides a kind of pixel circuit and its driving method, display device, can guarantee the uniform of brightness
Property and uniform display.
On the one hand, the embodiment of the invention provides a kind of pixel circuit, pixel circuit include: data write-in sub-circuit, just
Beginning beggar's circuit, light emitting control sub-circuit, drive sub-circuits and luminous sub-circuit；
Data write-in sub-circuit is connect with the first scanning signal, data-signal and drive sub-circuits respectively, is used for driving
Sub-circuit applies reference voltage or data voltage；
Initialize sub-circuit respectively with the second scanning signal, initializing signal, light emitting control sub-circuit and drive sub-circuits
Connection；
Light emitting control sub-circuit is connect with supply voltage, control signal, initialization sub-circuit and drive sub-circuits respectively, is used
In under control of the control signal, it connect supply voltage with drive sub-circuits；
Drive sub-circuits are electric with data write-in sub-circuit, initialization sub-circuit, light emitting control sub-circuit and the son that shines respectively
Road connection, it is luminous for driving luminous sub-circuit to carry out；
Luminous sub-circuit is connect with drive sub-circuits and common voltage respectively, under the control of light emitting control sub-circuit
With carried out under the driving of drive sub-circuits it is luminous.
In one embodiment of the invention, drive sub-circuits include: driving transistor, first capacitor and the second capacitor；
The grid of transistor is driven to connect with data write-in sub-circuit；
First pole of driving transistor is connect with light emitting control sub-circuit；
Second pole of driving transistor is connect with luminous sub-circuit；
First capacitor is connect with the second pole of the grid of driving transistor and driving transistor respectively；
Second capacitor respectively with driving transistor the second pole and initializing signal connect, or, the second capacitor respectively with drive
Second pole of dynamic transistor is connected with supply voltage.
In one embodiment of the invention, data write-in sub-circuit includes: the first transistor；
The grid of the first transistor is connect with the first scanning signal；
First pole of the first transistor is connect with drive sub-circuits；
Second pole of the first transistor is connect with data-signal.
In one embodiment of the invention, initialization sub-circuit includes: second transistor；
The grid of second transistor is connect with the second scanning signal；
First pole of second transistor is connect with initializing signal；
Second pole of second transistor is connect with the common end of light emitting control sub-circuit and drive sub-circuits.
In one embodiment of the invention, light emitting control sub-circuit includes third transistor；
The grid of third transistor is connect with control signal；
First pole of third transistor is connect with supply voltage；
Second pole of third transistor is connect with drive sub-circuits.
In one embodiment of the invention, luminous sub-circuit includes light-emitting component；
The anode of light-emitting component is connect with drive sub-circuits；
The cathode of light-emitting component is connect with common voltage.
On the other hand, the embodiment of the invention provides a kind of driving methods of pixel circuit, and driving method is for driving this
The pixel circuit that inventive embodiments provide；Method includes:
In initial phase, sub-circuit is written under the control of the first scanning signal in data, the ginseng that data-signal is provided
Voltage transmission is examined to drive sub-circuits, sub-circuit is initialized under the control of the second scanning signal, initializing signal is provided
Initialization voltage is transmitted to drive sub-circuits, is initialized with the voltage to drive sub-circuits；
In sample phase, sub-circuit is written under the control of the first scanning signal in data, the reference that data-signal is provided
Voltage transmission to drive sub-circuits, light emitting control sub-circuit is transmitted to driving under control of the control signal, by supply voltage
Circuit；
In programming phases, sub-circuit is written under the control of the first scanning signal in data, the data that data-signal is provided
The first voltage and drive sub-circuits of the common end of sub-circuit are written with data for voltage transmission to drive sub-circuits, drive sub-circuits
It is jumped with the second voltage of the common end of luminous sub-circuit, drive sub-circuits store the voltage of first voltage and second voltage
Difference；
In light emitting phase, light emitting control sub-circuit under control of the control signal, controls supply voltage and drive sub-circuits
Connection, the sub-circuit that shines carry out luminous under the driving of voltage difference and supply voltage that drive sub-circuits store.
In one embodiment of the invention, drive sub-circuits include: driving transistor, first capacitor and the second capacitor；
It includes: the first transistor that sub-circuit, which is written, in data；Initializing sub-circuit includes: second transistor；Light emitting control sub-circuit includes
Third transistor；
In initial phase, the first transistor is connected under the control of the first scanning signal, the ginseng that data-signal is provided
Examine the first end that voltage is applied to first capacitor；Second transistor is connected under the control of the second scanning signal, drives transistor
Under the control of reference voltage and initialization voltage, the initialization voltage that initializing signal is provided is applied to the of first capacitor
Two ends, the first end of the second capacitor and the second capacitor second end, or the initialization voltage that initializing signal is provided is applied to
The first end of the second end of first capacitor and the second capacitor；
In sample phase, the first transistor is connected under the control of the first scanning signal, the reference that data-signal is provided
Voltage is applied to the first end of first capacitor；Third transistor is connected under control of the control signal, and supply voltage is applied to
Drive the first pole of transistor；Driving transistor is first connected under the control of reference voltage and supply voltage, when driving transistor
The second pole tension rise to reference voltage and drive transistor threshold voltage voltage difference when, driving transistor shutdown.
In one embodiment of the invention, in programming phases, the first transistor is led under the control of the first scanning signal
Logical, the data voltage that data-signal is provided is applied to the first end of first capacitor.
In another aspect, the embodiment of the present invention provides a kind of display device, including pixel circuit provided in an embodiment of the present invention.
The pixel circuit and its driving method of the embodiment of the present invention, display device can eliminate the threshold value of driving switch pipe
Voltage VthInfluence to the driving current for flowing through light-emitting component can also eliminate the IR pressure drop of supply voltage to flowing through light-emitting component
Driving current influence, can guarantee the homogeneity and uniform display of brightness.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will make below to required in the embodiment of the present invention
Attached drawing is briefly described, for those of ordinary skill in the art, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 shows the structural schematic diagram of pixel circuit provided in an embodiment of the present invention；
Fig. 2 shows a kind of concrete structure schematic diagrams of pixel circuit provided in an embodiment of the present invention；
Fig. 3 shows another concrete structure schematic diagram of pixel circuit provided in an embodiment of the present invention；
Fig. 4 shows the waveform timing chart during pixel circuit driving provided in an embodiment of the present invention；
Fig. 5 shows the flow diagram of pixel circuit provided in an embodiment of the present invention.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below, in order to make mesh of the invention
, technical solution and advantage be more clearly understood, with reference to the accompanying drawings and embodiments, the present invention is further retouched in detail
It states.It should be understood that specific embodiment described herein is only configured to explain the present invention, it is not configured as limiting the present invention.
To those skilled in the art, the present invention can be real in the case where not needing some details in these details
It applies.Below the description of embodiment is used for the purpose of better understanding the present invention to provide by showing example of the invention.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence " including ... ", it is not excluded that including
There is also other identical elements in the process, method, article or equipment of the element.
The embodiment of the present invention provides a kind of pixel circuit, as shown in Figure 1, Fig. 1 shows picture provided in an embodiment of the present invention
The structural schematic diagram of plain circuit.Pixel circuit includes: data write-in sub-circuit 101, initialization sub-circuit 102, light emitting control
Circuit 103, drive sub-circuits 104 and luminous sub-circuit 105.
Wherein, data write-in sub-circuit 101 respectively with the first scanning signal S1, data-signal V1 and drive sub-circuits 104
Connection, for reference voltage V to be written to drive sub-circuits 104refOr data voltage Vdata。
Initialize sub-circuit 102 respectively with the second scanning signal S2, initializing signal V2, light emitting control sub-circuit 103 and
Drive sub-circuits 104 connect.
Light emitting control sub-circuit 103 is sub with supply voltage VDD, control signal EM, initialization sub-circuit 102 and driving respectively
Circuit 104 connects, for connecting supply voltage VDD with drive sub-circuits 104 under the control of control signal EM.
Sub-circuit 101, initialization sub-circuit 102, light emitting control sub-circuit is written in drive sub-circuits 104 with data respectively
103 and luminous sub-circuit 105 connect, it is luminous for driving luminous sub-circuit 105 to carry out.
The sub-circuit 105 that shines is connect with drive sub-circuits 104 and common voltage VSS respectively, in light emitting control son electricity
It is carried out under the control on road 103 and under the driving of drive sub-circuits 104 luminous.
In one embodiment of the invention, drive sub-circuits 104 may include: driving transistor T, first capacitor C1 and
Second capacitor C2.It may include: the first transistor T1 that sub-circuit 101, which is written, in data.Initialization sub-circuit 102 may include: the
Two-transistor T2.Light emitting control sub-circuit 103 may include third transistor T3.The sub-circuit 105 that shines may include the member that shines
Part D1.
Drive the grid (Gate, G) of transistor T respectively with the first pole of the first transistor T1 and first capacitor C1 first
End connection.
The first pole of transistor T is driven to connect respectively with the second pole of second transistor T2 and the second pole of third transistor T3
It connects.
Drive the second pole of transistor T electric with the anode of light-emitting component D1, the second end of first capacitor C1 and second respectively
Hold the first end connection of C2.
The grid of the first transistor T1 is connect with the first scanning signal S1.
The second pole of the first transistor T1 is connect with data-signal V1.
The grid of second transistor T2 is connect with the second scanning signal S2.
The first pole of second transistor T2 is connect with the second end of initializing signal V2 and the second capacitor C2 respectively.
The grid of third transistor T3 is connect with control signal EM.
The first pole of third transistor T3 is connect with supply voltage VDD.
The cathode of light-emitting component D2 is connect with common voltage VSS.
Based on above-mentioned, pixel circuit provided in an embodiment of the present invention is as shown in Fig. 2, Fig. 2 shows the embodiment of the present invention to mention
A kind of concrete structure schematic diagram of the pixel circuit of confession.
In one embodiment of the invention, light-emitting component D1 can be Organic Light Emitting Diode.
In one embodiment of the invention, the first end of the second capacitor C2 can respectively with driving transistor T first
Pole, first capacitor C1 second end connected with the anode of light-emitting component D1；The second end of second capacitor C2 can respectively with third
The first pole of transistor T3 is connected with supply voltage VDD.As shown in figure 3, Fig. 3 shows pixel electricity provided in an embodiment of the present invention
Another concrete structure schematic diagram on road.
The effect of first capacitor C1 are as follows: the voltage difference of storage driving transistor T grid and the second pole；In light emitting phase, control
System driving transistor T conducting, and then light-emitting component D1 is made to shine.
The effect of second capacitor C2 are as follows: the voltage difference of first capacitor C1 storage is balanced.By the way that the second capacitor is arranged
C2, drive transistor T the second pole will not floating, so as to complete pixel circuit driving process four-stage.
In addition, inventors have found that the second end of the second capacitor C2 is connect with supply voltage VDD in Fig. 3.Due to supply voltage
VDD is highly stable, and therefore, counterbalance effect is more preferable, can more improve the homogeneity of display effect.
The driving process of pixel circuit is illustrated so that above-mentioned transistor is N-type metal-oxide-semiconductor as an example below.It is understood that
It is that the driving process of pixel circuit includes four-stage, respectively initial phase, sample phase, programming phases and luminous rank
Section.
In one embodiment of the invention, initializing signal V2 is always low level, and initializing signal V2 is provided
Initialization voltage VinitThan reference voltage VrefIt is lower.Supply voltage VDD is higher than data voltage Vdata, data voltage VdataHigher than ginseng
Examine voltage Vref。
Fig. 4 shows the waveform timing chart during pixel circuit driving provided in an embodiment of the present invention.
In initial phase, the first scanning signal S1, the second scanning signal S2 are in high level, and control signal EM is low
Level.The first transistor T1 is connected under the control of the first scanning signal S1.Second transistor T2 is the second scanning signal S2's
The lower conducting of control, third transistor T3 are turned off under the control of control signal EM.The reference voltage V that data-signal V1 is providedrefIt is logical
It crosses the first transistor T1 and is applied to the grid G of driving transistor T and the first end of first capacitor C1.At this point for driving transistor
For T, correspond to Fig. 2, the initialization voltage V that initializing signal V2 is providedinitIt is applied to the second end of the second capacitor C2, and is led to
The first pole that second transistor T2 is applied to driving transistor T is crossed, driving the voltage of the first pole of transistor T at this time is Vinit。
The coupled capacitor of first capacitor C1, light-emitting component D1 itself and the second capacitor C2 series connection, according to serial circuit capacitance voltage divider principle,
The voltage that first capacitor C1 divides is C1×(Vref-Vinit)/(C1+C2+CD1), C1For the capacitance of first capacitor C1, C2It is second
The capacitance of capacitor C2, CD1For the capacitance of the coupled capacitor of light-emitting component D1 itself.Drive the voltage of the second pole of transistor T
For Vref-C1×(Vref-Vinit)/(C1+C2+CD1)=(C2+CD1)×Vref/(C1+C2+CD1)+C1×Vinit/(C1+C2+CD1).By
In the initialization voltage V that initializing signal V2 is providedinitCompare VrefIt is lower, therefore the voltage of the first pole of transistor T is driven to be less than
The voltage of the second pole of transistor T is driven, the extremely source electrode of the first of driving transistor T drives transistor T conducting at this time.In this way
The initialization voltage V that initializing signal V2 is providedinitBy driving transistor T to be applied to the second pole (i.e. the of driving transistor T
The first end of the second end of one capacitor C1, the second capacitor C2).
Corresponding to Fig. 3, supply voltage VDD is applied to the second end of the second capacitor C2, and initializing signal V2 is provided initial
Change voltage VinitIt is applied to the first pole of driving transistor T by second transistor T2, drives the first pole of transistor T at this time
Voltage is Vinit；The coupled capacitor of first capacitor C1, light-emitting component D1 itself and the second capacitor C2 series connection, according to series circuit electricity
Hold voltage divider principle, the voltage that first capacitor C1 divides is C1×(VDD-Vref)/(C1+C2+CD1), then drive the second of transistor T
The voltage of pole is Vref+C1×(VDD-Vref)/(C1+C2+CD1)=(C2+CD1)×Vref/(C1+C2+CD1)+C1×VDD/(C1+C2+
CD1).The initialization voltage V provided due to initializing signal V2initCompare VrefIt is lower, drive the voltage of the first pole of transistor T small
Voltage in the second pole of driving transistor T, the extremely source electrode of the first of driving transistor T, drives transistor T conducting at this time.This
The initialization voltage V that sample initializing signal V2 is providedinitBy driving transistor T to be applied to the second pole of driving transistor T (i.e.
The first end of the second end of first capacitor C1, the second capacitor C2).
In sample phase, when sampling starts, the first scanning signal S1 and control signal EM are high level, the second scanning signal
S2 is low level.The first transistor T1 is connected under the control of the first scanning signal S1, and third transistor T3 is in control signal EM
Control under be connected, second transistor T2 is turned off under the control of the second scanning signal S2.The reference electricity that data-signal V1 is provided
Press VrefThe grid G of driving transistor T and the first end of first capacitor C1 are applied to by the first transistor T1.
For driving transistor T, correspond to Fig. 2 and Fig. 3, it, can be with according to serial circuit capacitance voltage divider principle
The voltage of the second pole of driving transistor T is calculated, and can show that the voltage of the second pole of driving transistor T is less than driving crystal
The voltage of the first pole of pipe T, the extremely source electrode of the second of driving transistor T, drives transistor T in reference voltage VrefIt is brilliant with driving
It is connected under the control of the second pole tension of body pipe T.When the second pole tension of driving transistor T rises to Vref-VthWhen, driving is brilliant
Body pipe T shutdown, sampling terminate.The voltage difference V of the grid G of first capacitor C1 storage driving transistor T and the second pole at this timeref-
(Vref-Vth)=Vth.It is understood that the second pole tension in driving transistor T rises to Vref-VthBefore, light-emitting component
D1 can flow through faint electric current, but the electric current is insufficient to allow light-emitting component D1 to shine.
Wherein, sample phase calculates the process of the voltage of the second pole of driving transistor T and initial phase is calculated and driven
The process of the voltage of the second pole of transistor T is similar, and the embodiment of the present invention does not repeat it herein, specifically refers to above-mentioned
Initial phase calculates the process of the voltage of the second pole of driving transistor T.
In programming phases, correspond to Fig. 2 and Fig. 3, the first scanning signal S1 is high level, the second scanning signal S2, control
Signal EM is low level.The first transistor T1 is connected under the control of the first scanning signal S1.Conducting, second transistor T2 is the
It is turned off under the control of control signal EM under the control of two scanning signal S2 with third transistor T3.What data-signal V1 was provided
Reference voltage VdataThe grid G of driving transistor T and the first end of first capacitor C1 are applied to by the first transistor T1.At this time
The voltage for driving the grid G of transistor T is Vdata.Drive the voltage of the grid G of transistor T by VrefJump is Vdata, that is, driving
The voltage jump amount △ u=V of the grid G of transistor Tdata-Vref；Correspondingly, the voltage of the second pole of driving transistor T also can
It jumps.Since the coupled capacitor of first capacitor C1, light-emitting component D1 itself and the second capacitor C2 are connected, according to series circuit
Principle of capacitive divider drives jump amount △ u '=△ u × C of the voltage of the second pole of transistor T1/(C1+C2+CD1)=(Vdata-
Vref)×C1/(C1+C2+CD1).After the completion of programming phases, the grid G voltage of driving transistor T is Vdata.Drive transistor T's
The voltage of second pole is (Vref-Vth)+(Vdata-Vref)×C1/(C1+C2+CD1).The grid of first capacitor C1 storage driving transistor T
The voltage difference V of pole G and the second poledata-(Vref-Vth)-(Vdata-Vref)×C1/(C1+C2+CD1)=Vth+(Vdata-Vref)×(C2
+CD1)/(C1+C2+CD1)。
In light emitting phase, the first scanning signal S1 and the second scanning signal S2 are low level, and control signal EM is high level.
Third transistor T3 is connected under the control of control signal EM.The first transistor T1 is under the control of the first scanning signal S1 and the
Two-transistor T2 is turned off under the control of the second scanning signal S2.The grid G voltage of transistor T is driven to keep Vdata.Driving
The second pole tension of transistor T keeps (Vref-Vth)+(Vdata-Vref)×C1/(C1+C2+CD1).At this point for driving transistor T
For, driving the voltage of the first pole of transistor T is supply voltage VDD, and the voltage of the first pole of transistor T is driven to be higher than driving
The voltage of the second pole of transistor T, the extremely drain D of the first of driving transistor T, the extremely source S of the second of driving transistor T,
At this point, the grid G of first capacitor C1 storage driving transistor T and the voltage difference V of the second poleth+(Vdata-Vref)×(C2+CD1)/
(C1+C2+CD1) it is the grid G of driving transistor T and the voltage difference V of source SGS.Due to first capacitor C1 storage driving crystal
The voltage difference V of the grid G of pipe T and the second poleth+(Vdata-Vref)×(C2+CD1)/(C1+C2+CD1) it is greater than Vth, that is, drive crystal
The grid G of pipe T and the voltage difference V of source SGSGreater than Vth, driving transistor T conducting.At this point, third transistor T3, driving crystal
In a concatenated access, light-emitting component D1 starts to shine pipe T and light-emitting component D1.Flow through the electric current of light-emitting component D1
Wherein, μ is the carrier mobility for driving transistor T, CoxFor the capacitor for driving transistor T, W is driving transistor
The channel width of T, L are the channel length for driving transistor T, VGSTo drive the grid G of transistor T and the voltage difference of source S.
Utilize VGS=Vth+(Vdata-Vref)×(C2+CD1)/(C1+C2+CD1) to formula (1) abbreviation, it obtains flowing through this and shines
The electric current of element D1:
The electric current I of light-emitting component D1 is flowed through it can be seen from formula (2)D1With the threshold voltage V of driving switch pipe Tth
It is unrelated, it is also unrelated with the IR pressure drop of supply voltage VDD, therefore, the threshold voltage V of driving switch pipe T can be eliminatedthIt sends out flowing through
The influence of the electric current of optical element can also eliminate influence of the IR pressure drop of supply voltage VDD to the electric current for flowing through light-emitting component, energy
Enough guarantee the homogeneity and uniform display of brightness.
The inclined of light-emitting component D1 electric current is flowed through in supply voltage VDD deviation 0.1V using existing 2T1C pixel circuit
Rate is up to 10%, in the threshold voltage V of driving transistor TthWhen deviation 0.15V, the deviation ratio of light-emitting component D1 electric current is flowed through
It is higher.And light-emitting component D1 is flowed through in supply voltage VDD deviation 0.1V using pixel circuit provided in an embodiment of the present invention
The deviation ratio of electric current is no more than 1%, in the threshold voltage V of driving transistor TthWhen deviation 0.15V, light-emitting component D1 electric current is flowed through
Deviation ratio be about 5%.Flow through light-emitting component D1 electric current deviation ratio reduce, realize to flow through light-emitting component D1 electric current mend
It repays.
Based on above-mentioned, the embodiment of the present invention provides a kind of driving method of pixel circuit, and the driving method is for driving this
The pixel circuit that inventive embodiments provide.Fig. 5 shows the process of the driving method of pixel circuit provided in an embodiment of the present invention
Schematic diagram.The driving method of pixel circuit may include:
S501: in initial phase, sub-circuit 101 is written under the control of the first scanning signal S1 in data, and data are believed
The reference voltage V that number V1 is providedrefIt is transmitted to drive sub-circuits 104, control of the initialization sub-circuit 102 in the second scanning signal S2
Under system, initialization voltage V that initializing signal V2 is providedinitDrive sub-circuits 104 are transmitted to, to drive sub-circuits 104
Voltage initialized.
S502: in sample phase, sub-circuit 101 is written under the control of the first scanning signal S1 in data, by data-signal
The reference voltage V that V1 is providedrefBe transmitted to drive sub-circuits 104, light emitting control sub-circuit 103 under the control of control signal EM,
Supply voltage VDD is transmitted to drive sub-circuits 104.
S503: in programming phases, sub-circuit 101 is written under the control of the first scanning signal S1 in data, by data-signal
The data voltage V that V1 is provideddataIt is transmitted to drive sub-circuits 104, the public affairs of drive sub-circuits 104 and data write-in sub-circuit 101
The second voltage of the first voltage and drive sub-circuits 104 and the common end of luminous sub-circuit 105 held altogether jumps, driving
The voltage difference of circuit 104 storage first voltage and second voltage.
S504: in light emitting phase, light emitting control sub-circuit 103 controls supply voltage VDD under the control of control signal EM
It is connect with drive sub-circuits 104, the drive of voltage difference and supply voltage VDD that luminous sub-circuit 105 is stored in drive sub-circuits 104
It is carried out under dynamic luminous.
In one embodiment of the invention, drive sub-circuits 104 include: driving transistor T, first capacitor C1 and second
Capacitor C2；It includes: the first transistor T1 that sub-circuit 101, which is written, in data；Initializing sub-circuit includes: second transistor T2；It shines
Controlling sub-circuit 103 includes third transistor T3.
In initial phase, the first scanning signal S1, the second scanning signal S2 are in high level, and control signal EM is low
Level.The first transistor T1 is connected under the control of the first scanning signal S1.Second transistor T2 is the second scanning signal S2's
The lower conducting of control, third transistor T3 are turned off under the control of control signal EM.The reference voltage V that data-signal V1 is providedrefIt is logical
It crosses the first transistor T1 and is applied to the grid G of driving transistor T and the first end of first capacitor C1.
The initialization voltage V provided corresponding to Fig. 2, initializing signal V2initIt is applied to the second end of the second capacitor C2, and
The first pole of driving transistor T is applied to by second transistor T2, and by driving transistor T to be applied to driving transistor T
The second pole (i.e. the second end of first capacitor C1, the first end of the second capacitor C2).
Corresponding to Fig. 3, supply voltage VDD is applied to the second end of the second capacitor C2, and initializing signal V2 is provided initial
Change voltage VinitThe first pole of driving transistor T is applied to by second transistor T2, and by driving transistor T to be applied to drive
The second pole (i.e. the second end of first capacitor C1, the first end of the second capacitor C2) of dynamic transistor T.
In sample phase, the first scanning signal S1 and control signal EM are high level, and the second scanning signal S2 is low level.
The first transistor T1 is connected under the control of the first scanning signal S1, and third transistor T3 is led under the control of control signal EM
Logical, second transistor T2 is turned off under the control of the second scanning signal S2.The reference voltage V that data-signal V1 is providedrefPass through
One transistor T1 is applied to the grid G of driving transistor T and the first end of first capacitor C1.Drive transistor T in reference voltage
VrefIt is first connected under control with the second pole tension of driving transistor T, when the second pole tension of driving transistor rises to reference
Voltage VrefWith the threshold voltage V of driving transistorthVoltage difference Vref-VthWhen, driving transistor shutdown.At this point, first capacitor
The voltage (driving the grid G voltage of transistor T) of the first end of C1 are as follows: Vref, the voltage of the second end of first capacitor C1 is (i.e.
Drive the second pole tension of transistor T) are as follows: Vref-Vth.The grid G of first capacitor C1 storage driving transistor T and the second pole
Voltage difference Vref-(Vref-Vth)=Vth。
In one embodiment of the invention, in programming phases, the first scanning signal S1 is high level, the second scanning signal
S2, control signal EM are low level.The first transistor T1 is connected under the control of the first scanning signal S1.Conducting, the second crystal
Pipe T2 is turned off under the control of control signal EM under the control of the second scanning signal S2 with third transistor T3.Data-signal
The data voltage V that V1 is provideddataBy the first transistor T1 be applied to driving transistor T grid G and first capacitor C1 the
One end.The voltage for driving the grid G of transistor T at this time is Vdata.Drive the voltage of the grid G of transistor T by VrefJump is
Vdata, that is, the voltage jump amount △ u=V of the grid G of driving transistor Tdata-Vref；Correspondingly, the second pole of driving transistor T
Voltage can also jump.Drive jump amount △ u '=△ u × C of the voltage of the second pole of transistor T1/(C1+C2+CD1)=
(Vdata-Vref)×C1/(C1+C2+CD1)。
After the completion of programming phases, the grid G voltage of driving transistor T is Vdata.Driving transistor T the second pole tension be
(Vref-Vth)+(Vdata-Vref)×C1/(C1+C2+CD1).The grid G of first capacitor C1 storage driving transistor T and the second pole
Voltage difference Vth+(Vdata-Vref)×(C2+CD1)/(C1+C2+CD1)。
In light emitting phase, the first scanning signal S1 and the second scanning signal S2 are low level, and control signal EM is high level.
Third transistor T3 is connected under the control of control signal EM.The first transistor T1 is under the control of the first scanning signal S1 and the
Two-transistor T2 is turned off under the control of the second scanning signal S2.The grid G voltage of transistor T is driven to keep Vdata.Driving
The second pole tension of transistor T keeps (Vref-Vth)+(Vdata-Vref)×C1/(C1+C2+CD1), the of transistor T is driven at this time
Two extremely source electrodes.Drive transistor T conducting.At this point, third transistor T3, driving transistor T and light-emitting component are connected at one
Access in, light-emitting component starts to shine.Flow through the electric current of the light-emitting component are as follows:
Flow through the electric current of light-emitting component and the threshold voltage V of driving switch pipe TthIt is unrelated, also pressed with the IR of supply voltage VDD
It drops unrelated, therefore, the threshold voltage V of driving switch pipe T can be eliminatedthInfluence to the electric current for flowing through light-emitting component, also can
Influence of the IR pressure drop to the electric current for flowing through light-emitting component for eliminating supply voltage VDD can guarantee the homogeneity and uniformly of brightness
Display.
The embodiment of the present invention also provides a kind of display device, which includes pixel electricity provided in an embodiment of the present invention
Road.
It should be clear that the invention is not limited to specific configuration described above and shown in figure and processing.
For brevity, it is omitted here the detailed description to known method.In the above-described embodiments, several tools have been described and illustrated
The step of body, is as example.But method process of the invention is not limited to described and illustrated specific steps, this field
Technical staff can be variously modified, modification and addition after understanding spirit of the invention, or suitable between changing the step
Sequence.
It should also be noted that, the exemplary embodiment referred in the present invention, is retouched based on a series of step or device
State certain methods or system.But the present invention is not limited to the sequence of above-mentioned steps, that is to say, that can be according in embodiment
The sequence referred to executes step, may also be distinct from that the sequence in embodiment or several steps are performed simultaneously.
The above description is merely a specific embodiment, it is apparent to those skilled in the art that,
For convenience of description and succinctly, the system, module of foregoing description and the specific work process of unit can refer to preceding method
Corresponding process in embodiment, details are not described herein.It should be understood that scope of protection of the present invention is not limited thereto, it is any to be familiar with
Those skilled in the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or substitutions,
These modifications or substitutions should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of pixel circuit, which is characterized in that the pixel circuit includes: data write-in sub-circuit, initialization sub-circuit, hair
Photocontrol sub-circuit, drive sub-circuits and luminous sub-circuit；
The data write-in sub-circuit connect with the first scanning signal, data-signal and the drive sub-circuits respectively, be used for
The drive sub-circuits apply reference voltage or data voltage；
The initialization sub-circuit respectively with the second scanning signal, initializing signal, the light emitting control sub-circuit and the drive
Mover circuit connection；
The light emitting control sub-circuit is electric with supply voltage, control signal, the initialization sub-circuit and driving respectively
Road connection, under the control of said control signal, connecting the supply voltage with the drive sub-circuits；
The drive sub-circuits are electric with data write-in sub-circuit, the initialization sub-circuit, light emitting control respectively
Road is connected with the luminous sub-circuit, luminous for driving luminous sub-circuit to carry out；
The luminous sub-circuit is connect with the drive sub-circuits and common voltage respectively, in the light emitting control sub-circuit
Control under and the drive sub-circuits driving under carry out it is luminous.
2. pixel circuit according to claim 1, which is characterized in that the drive sub-circuits include: driving transistor, the
One capacitor and the second capacitor；
The grid of the driving transistor is connect with data write-in sub-circuit；
First pole of the driving transistor is connect with the light emitting control sub-circuit；
Second pole of the driving transistor is connect with the luminous sub-circuit；
The first capacitor is connect with the second pole of the grid of the driving transistor and the driving transistor respectively；
Second capacitor is connect with the second pole of the driving transistor and the initializing signal respectively, or,
Second capacitor is connect with the second pole of the driving transistor and the supply voltage respectively.
3. pixel circuit according to claim 1, which is characterized in that the data write-in sub-circuit includes: first crystal
Pipe；
The grid of the first transistor is connect with first scanning signal；
First pole of the first transistor is connect with the drive sub-circuits；
Second pole of the first transistor is connect with the data-signal.
4. pixel circuit according to claim 1, which is characterized in that the initialization sub-circuit includes: second transistor；
The grid of the second transistor is connect with second scanning signal；
First pole of the second transistor is connect with the initializing signal；
Second pole of the second transistor is connect with the common end of the light emitting control sub-circuit and the drive sub-circuits.
5. pixel circuit according to claim 1, which is characterized in that the light emitting control sub-circuit includes: third crystal
Pipe；
The grid of the third transistor is connect with the control signal；
First pole of the third transistor is connect with the supply voltage；
Second pole of the third transistor is connect with the drive sub-circuits.
6. pixel circuit according to claim 1, which is characterized in that the luminous sub-circuit includes light-emitting component；
The anode of the light-emitting component is connect with the drive sub-circuits；
The cathode of the light-emitting component is connect with the common voltage.
7. a kind of driving method of pixel circuit, which is characterized in that the driving method is for driving picture described in claim 1
Plain circuit；The described method includes:
In initial phase, the data write-in sub-circuit is under the control of first scanning signal, by the data-signal
The reference voltage of offer is transmitted to the drive sub-circuits, control of the initialization sub-circuit in second scanning signal
Under, the initialization voltage that the initializing signal provides is transmitted to the drive sub-circuits, to the drive sub-circuits
Voltage is initialized；
In sample phase, the data write-in sub-circuit mentions the data-signal under the control of first scanning signal
The reference voltage of confession is transmitted to the drive sub-circuits, and the light emitting control sub-circuit under the control of said control signal, will
The supply voltage is transmitted to the drive sub-circuits；
In programming phases, the data write-in sub-circuit mentions the data-signal under the control of first scanning signal
The data voltage of confession is transmitted to the drive sub-circuits, and the common end of sub-circuit is written in the drive sub-circuits and the data
First voltage and the drive sub-circuits and the second voltage of the common end of the luminous sub-circuit jump, driving
Circuit stores the voltage difference of the first voltage and the second voltage；
In light emitting phase, the light emitting control sub-circuit under the control of said control signal, controls the supply voltage and institute
State drive sub-circuits connection, the drive of voltage difference and the supply voltage that the luminous sub-circuit is stored in the drive sub-circuits
It is carried out under dynamic luminous.
8. driving method according to claim 7, which is characterized in that the drive sub-circuits include: driving transistor, the
One capacitor and the second capacitor；The data write-in sub-circuit includes: the first transistor；The initialization sub-circuit includes: second
Transistor；The light emitting control sub-circuit includes third transistor；
In the initial phase, the first transistor is connected under the control of first scanning signal, by the data
The reference voltage that signal provides is applied to the first end of the first capacitor；The second transistor is in second scanning signal
Control under be connected, the driving transistor is connected under the control of the reference voltage and the initialization voltage, will be described
The initialization voltage that initializing signal provides is applied to the second end of the first capacitor, the first end of second capacitor and institute
The second end of the second capacitor is stated, or the initialization voltage that the initializing signal provides is applied to the second of the first capacitor
The first end at end and second capacitor；
In the sample phase, the first transistor is connected under the control of first scanning signal, the data is believed
Number reference voltage provided is applied to the first end of the first capacitor；Control of the third transistor in the control signal
The supply voltage is applied to the first pole of the driving transistor by lower conducting；The driving transistor is described with reference to electricity
It is first connected under the control of pressure and supply voltage, when the second pole tension of driving transistor rises to reference voltage and driving transistor
Threshold voltage voltage difference when, driving transistor shutdown.
9. according to the method described in claim 8, it is characterized in that,
In the programming phases, the first transistor is connected under the control of first scanning signal, the data is believed
Number data voltage provided is applied to the first end of the first capacitor.
10. a kind of display device, which is characterized in that the display device includes pixel electricity as claimed in any one of claims 1 to 6
Road.
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| CN201910017114.XA CN109584804B (en) | 2019-01-08 | 2019-01-08 | Pixel circuit, driving method thereof and display device |
| PCT/CN2019/098148 WO2020143215A1 (en) | 2019-01-08 | 2019-07-29 | Pixel circuit and driving method therefor, and display device |
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| CN111210773A (en) * | 2020-01-20 | 2020-05-29 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display device |
| WO2020143215A1 (en) * | 2019-01-08 | 2020-07-16 | 昆山国显光电有限公司 | Pixel circuit and driving method therefor, and display device |
| CN115662339A (en) * | 2022-10-25 | 2023-01-31 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit, display panel and driving method of pixel driving circuit |
| WO2024098800A1 (en) * | 2022-11-07 | 2024-05-16 | 武汉华星光电半导体显示技术有限公司 | Pixel circuit and display panel |
| WO2024197527A1 (en) * | 2023-03-27 | 2024-10-03 | 京东方科技集团股份有限公司 | Pixel circuit, pixel driving method, and display apparatus |
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| WO2020143215A1 (en) | 2020-07-16 |
| CN109584804B (en) | 2020-12-29 |
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