CN110047440A - Pixel circuit, driving method, display panel and display device - Google Patents
Pixel circuit, driving method, display panel and display device Download PDFInfo
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- CN110047440A CN110047440A CN201910434649.7A CN201910434649A CN110047440A CN 110047440 A CN110047440 A CN 110047440A CN 201910434649 A CN201910434649 A CN 201910434649A CN 110047440 A CN110047440 A CN 110047440A
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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]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of El Displays (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The present invention provides a kind of pixel circuit, driving method, display panel and display device.Pixel circuit includes light-emitting component, driving circuit, accumulator, data write circuit, compensation circuit and emission control circuit；For data write circuit under the control of data write control signal, the second node is written by the first end of data voltage write driver circuit, and by initialization voltage in control；Compensation circuit is controlled and is connected between the control terminal of driving circuit and the second end of driving circuit under compensating control signal control；Emission control circuit is controlled and is connected between the first end of driving circuit and first voltage end under the control of LED control signal, and is controlled and be connected between the second end of driving circuit and light-emitting component, and is controlled and be connected between first voltage end and second node.The present invention is able to ascend show uniformity.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of pixel circuit, driving method, display panel and display dresses
It sets.
Background technique
AMOLED (Active-matrix organic light-emitting diode, active matrix organic light-emitting two
Pole pipe) display screen be current display field research one of hot spot, low energy consumption, self-luminous, wide viewing angle and high response speed etc.
Advantage makes it there is a strong possibility in the near future that liquid crystal display will be substituted comprehensively.So as AMOLED display screen core skill
The pixel circuit of one of art has important research significance.
It is limited by thin film transistor (TFT) preparation process and material, TFT (the Thin Film in each region of AMOLED display screen
Transistor, thin film transistor (TFT)) characteristic can have differences, i.e., and the threshold voltage of each TFT can have differences；And when with display
Between extension, different degrees of drift can occur for the threshold voltage of the driving TFT of different display areas.And since driving voltage is walked
IR load is larger on line, so driving voltage can be gradually decreased due to IR pressure drop along driving voltage direction of routing, that is, causes
AMOLED display screen is gradually changed along driving voltage direction of routing display brightness.
Traditional pixel circuit does not have threshold voltage and IR voltage-drop compensation function, and it is aobvious to be also unable to satisfy AMOLED at this stage
The requirement of display screen brightness uniformity.
Summary of the invention
The main purpose of the present invention is to provide a kind of pixel circuit, driving method, display panel and display devices, solve
Existing pixel circuit does not have threshold voltage and IR voltage-drop compensation function, is unable to satisfy AMOLED brightness of display screen uniformity
It is required that the problem of.
In order to achieve the above object, the present invention provides a kind of pixel circuits, including light-emitting component, driving circuit, energy storage
Circuit, data write circuit, compensation circuit and emission control circuit, wherein
The control terminal of the driving circuit is connect with first node, and the driving circuit is for the current potential in its control terminal
Under control, controls and be connected between the first end of the driving circuit and the second end of the driving circuit；
The first end of the accumulator is connect with the control terminal of the driving circuit, the second end of the accumulator with
Second node connection, the accumulator are used to control the current potential of the control terminal of the driving circuit；
The data write circuit is used under the control of the data write control signal of data write-in control line input, control
The first end of the driving circuit is written in data voltage by system, and the second node is written in initialization voltage；
The compensation circuit is used under the compensating control signal control of compensation control line input, controls the driving circuit
Control terminal and the second end of the driving circuit between be connected to；
The emission control circuit is used under the control for the LED control signal that light emitting control line inputs, and controls the drive
Be connected between the first end and first voltage end of dynamic circuit, and control the driving circuit second end and the light-emitting component it
Between be connected to, and control and be connected between the first voltage end and the second node.
When implementation, pixel circuit of the present invention further includes initialization control circuit；
The initialization control circuit is used under the control of the initialization control signal on initialization control line, and control will
The first pole of the second node, the first node and the light-emitting component is written in the initialization voltage, described in control
Light-emitting component does not shine；
Second pole of the light-emitting component is connect with second voltage end.
When implementation, the light-emitting component is Organic Light Emitting Diode；The extremely described organic hair of the first of the light-emitting component
The anode of optical diode, the cathode of the extremely described Organic Light Emitting Diode of the second of the light-emitting component；The initialization control
Circuit is in bias state for controlling the Organic Light Emitting Diode.
When implementation, the initialization control circuit includes the first initialization control transistor, the second initialization control crystal
Pipe and third initialization control transistor；
The control electrode of the first initialization control transistor is connect with the initialization control line, first initialization
First pole of control transistor connect with initialization voltage line, and first initialization controls the second pole and described the of transistor
The connection of two nodes；
The control electrode of the second initialization control transistor is connect with the initialization control line, second initialization
First pole of control transistor connect with the second node, and second initialization controls the second pole and described the of transistor
The connection of one node；
The control electrode of the third initialization control transistor is connect with the initialization control line, the third initialization
First pole of control transistor is connect with the first node, the second pole of the third initialization control transistor and the hair
First pole of optical element connects.
When implementation, the data write circuit includes data writing transistor and the first initialization writing transistor；
The control electrode of the data writing transistor is connect with data write-in control line, the data writing transistor
The first pole connect with data line, the second pole of the data writing transistor is connect with the first end of the driving circuit；Institute
It states data line and is used to provide the described data voltage；
The control electrode of the first initialization writing transistor is connect with data write-in control line, and described first is initial
The first pole for changing transistor is connect with initialization voltage line, the second pole of first initialization transistor and the second node
Connection；The initialization voltage line is used to provide the described initialization voltage.
When implementation, the compensation circuit includes compensation transistor；
The control electrode of the compensation transistor is connect with the compensation control line, the first pole of the compensation transistor and institute
First node connection is stated, the second pole of the compensation transistor is connect with the second end of the driving circuit.
When implementation, the emission control circuit includes the first light emitting control transistor, the second light emitting control transistor and the
Three light emitting control transistors；
The control electrode of the first light emitting control transistor is connect with the light emitting control line, and first light emitting control is brilliant
First pole of body pipe is connect with the first voltage end, the second pole of the first light emitting control transistor and the driving circuit
First end connection；
The control electrode of the second light emitting control transistor is connect with the light emitting control line, and second light emitting control is brilliant
First pole of body pipe is connect with the second end of the driving circuit, the second pole of the second light emitting control transistor and the hair
Optical element connection；
The control electrode of the third light emitting control transistor is connect with the light emitting control line, and the third light emitting control is brilliant
First pole of body pipe is connect with the second node, the second pole of the third light emitting control transistor and the first voltage end
Connection.
When implementation, the driving circuit includes driving transistor, and the accumulator includes storage capacitance；
The control terminal of the extremely described driving circuit of control of the driving transistor, the first of the driving transistor is extremely
The first end of the driving circuit, the second end of the second extremely described driving circuit of the driving transistor；
The first end of the storage capacitance is connect with the control terminal of the driving circuit, the second end of the storage capacitance with
Second node connection.
The present invention also provides a kind of driving methods, and applied to above-mentioned pixel circuit, the display cycle includes setting gradually
Data write phase and light emitting phase；The driving method includes:
In data write phase, under the control of data write control signal, data write circuit is controlled data voltage
Second node is written in initialization voltage by the first end of write driver circuit；Under the control of compensating control signal, compensation circuit
It controls and is connected between the control terminal and the second end of driving circuit of driving circuit, be accumulator charging by data voltage, with
The current potential of first node is promoted, until the driving circuit disconnects the company between its first end and the second end of the driving circuit
It connects；
In light emitting phase, under the control of LED control signal, emission control circuit control driving circuit first end with
First voltage is connected between end, and is controlled and be connected between the second end of the driving circuit and light-emitting component, and controls described
It is connected between one voltage end and the second node, under the action of accumulator, changes the voltage of the first node, so that
Obtain the driving circuit drives light-emitting component to shine under the control of its control terminal.
When implementation, the pixel circuit further includes initialization control circuit；The display cycle further include be set to it is described
Initial phase before data write phase；The driving method further include:
In initial phase, under the control of initialization control signal, the initialization control circuit control will be described first
The first pole of the second node, the first node and the light-emitting component is written in beginningization voltage, so that the energy storage is electric
The current potential of the second end of the current potential of the first end on road and the accumulator is all initialization voltage, and controls the light-emitting component
It does not shine.
When implementation, the light-emitting component is Organic Light Emitting Diode, the extremely described organic hair of the first of the light-emitting component
The anode of optical diode；The driving method includes: in the initial phase, and the initialization control circuit passes through control institute
Initialization voltage is stated less than the voltage that the cathode of the Organic Light Emitting Diode accesses, to control at the Organic Light Emitting Diode
In bias state.
The present invention also provides a kind of display panels, including above-mentioned pixel circuit.
The present invention also provides a kind of display devices, including above-mentioned display panel.
Compared with prior art, pixel circuit of the present invention, driving method, display panel and display device can be real
Existing threshold voltage compensation, compensates for influence of the threshold voltage difference to show uniformity, and can compensate for the IR pressure of driving voltage
Influence to show uniformity is dropped.
Detailed description of the invention
Fig. 1 is the structure chart of pixel circuit described in the embodiment of the present invention；
Fig. 2 is the structure chart of pixel circuit described in another embodiment of the present invention；
Fig. 3 is the circuit diagram of a specific embodiment of pixel circuit of the present invention；
Fig. 4 is the working timing figure of the specific embodiment of pixel circuit of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The transistor used in all embodiments of the invention all can be triode, thin film transistor (TFT) or field-effect tube or its
The identical device of his characteristic.In embodiments of the present invention, to distinguish the two poles of the earth of transistor in addition to control electrode, will wherein claim a pole
For the first pole, another pole is known as the second pole.
In practical operation, when the transistor is triode, the control electrode can be base stage, and first pole can
Think collector, second pole can be with emitter；Alternatively, the control electrode can be base stage, described first can be extremely hair
Emitter-base bandgap grading, second pole can be with collector.
In practical operation, when the transistor is thin film transistor (TFT) or field-effect tube, the control electrode can be grid
Pole, described first can be extremely drain electrode, and described second extremely can be source electrode；Alternatively, the control electrode can be grid, described the
One extremely can be source electrode, and described second can be extremely drain electrode.
As shown in Figure 1, pixel circuit described in the embodiment of the present invention includes light-emitting element E L, driving circuit 11, energy storage electricity
Road 12, data write circuit 13, compensation circuit 14 and emission control circuit 15, wherein
The control terminal of the driving circuit 11 is connect with first node N1, and the driving circuit 11 is used in its control terminal
Under the control of current potential, controls and be connected between the first end of the driving circuit 11 and the second end of the driving circuit 11；
The first end of the accumulator 12 is connect with the control terminal of the driving circuit 11, and the of the accumulator 12
Two ends are electrically connected with second node N2, and the accumulator is used to control the current potential of the control terminal of the driving circuit 11；
Control line Ctrd, data voltage line, the driving circuit 11 is written with data respectively in the data write circuit 13
First end, initialization voltage line and the second node N2 electrical connection, for data write-in control line Ctrd input number
According under the control of write control signal, the first end of the driving circuit 11 is written in data voltage Vdata by control, and will be initial
Change voltage Vinit and the second node N2 is written；The data line is used to provide the described data voltage Vdata, the initialization
Pressure-wire is used to provide the described initialization voltage Vinit；
The compensation circuit 14 is electric with compensation control line Ctrc, the control terminal of the driving circuit 11 and the driving respectively
The second end on road 11 is electrically connected, for controlling the driving under the compensating control signal control of compensation control line Ctrc input
It is connected between the control terminal of circuit 11 and the second end of the driving circuit 11；
The emission control circuit 15 respectively with light emitting control line EM, the first end of the driving circuit 11, first voltage
VT1, the second end of the driving circuit 11, the light-emitting element E L and second node N2 electrical connection are held, in light emitting control
Under the control of the LED control signal of line EM input, control between the first end of the driving circuit 11 and first voltage end VT1
Connection, and control and be connected between the second end of the driving circuit 11 and the light-emitting element E L, and control the first voltage
It is connected between the VT1 and second node N2 of end.
In embodiments of the present invention, the first voltage end VT1 is driving voltage end.
In the specific implementation, the first voltage end VT1 can be the high voltage end of high input voltage VDD, but not with this
It is limited.
In the specific implementation, the accumulator 12 may include storage capacitance, and but not limited to this.
In the specific implementation, the light-emitting element E L can be Organic Light Emitting Diode, and but not limited to this.
Also, in embodiments of the present invention, the data write-in control line Ctrd and compensation control line Ctrc can be with
For scan line S (n), but not limited to this.
At work, the display cycle may include setting gradually to the embodiment of present invention pixel circuit as shown in Figure 1
Data write phase and light emitting phase；
In data write phase, under the control of the data write control signal of Ctrd input, data write circuit 13 is controlled
Second node N2 is written by the first end of data voltage Vdata write driver circuit 11, by initialization voltage Vinit in system；?
Under the control of the compensating control signal of Ctrc input, compensation circuit 14 controls the control terminal and driving circuit 11 of driving circuit 11
It being connected between second end, data voltage Vdata is the accumulator 12 charging, to promote the current potential of first node N1, until
The driving circuit 11 disconnects the connection between its first end and the second end of the driving circuit 11, at this time the first node
The current potential of N1 is Vdata+Vth (threshold voltage that Vth is the driving transistor that the driving circuit 11 includes), and the current potential of N2 is
Vinit；
In light emitting phase, under the control of the LED control signal of EM input, emission control circuit 15 controls driving circuit
Be connected between 11 first end and first voltage end VT1, and control the driving circuit 11 second end and light-emitting element E L it
Between be connected to, and control and be connected between VT1 and the second node N2, under the action of accumulator 12, the first node N1
Voltage change be Vdata+Vth+V1-Vinit；Wherein, V1 is that the first voltage of first voltage end VT1 input is (described
First voltage V1 is also driving voltage)；The driving circuit 11 control its first end and the driving circuit 11 second end it
Between be connected to；Light-emitting element E L shines under the driving of the driving circuit 11, and the driving circuit 11 drives light-emitting element E L's
Driving current is unrelated with Vth and V1, therefore can be realized threshold voltage compensation, compensates for Vth difference to the shadow of show uniformity
It rings, and can compensate for influence of the IR Drop (IR pressure drop) of driving voltage to show uniformity.
Preferably, pixel circuit described in the embodiment of the present invention can also include initialization control circuit；
The initialization control circuit is used under the control of the initialization control signal on initialization control line, and control will
The first pole of the second node, the first node and the light-emitting component is written in the initialization voltage, described in control
Light-emitting component does not shine；
Second pole of the light-emitting component is connect with second voltage end.
In the specific implementation, the second voltage end can be low-voltage end or ground terminal, and but not limited to this.
Specifically, the light-emitting component can be Organic Light Emitting Diode；The first of the light-emitting component is extremely described to be had
The anode of machine light emitting diode, the cathode of the extremely described Organic Light Emitting Diode of the second of the light-emitting component；The initialization
Control circuit is in bias state for controlling the Organic Light Emitting Diode.
As shown in Fig. 2, on the basis of the embodiment of pixel circuit shown in Fig. 1, pixel described in the embodiment of the present invention
Circuit further includes initialization control circuit 16；The light-emitting component is Organic Light Emitting Diode OLED；The of the light-emitting component
The one extremely anode of OLED, the extremely cathode of OLED of the second of the light-emitting component；
The initialization control circuit 16 respectively with initialization control line S (n-1), second node N2, first node N1 and
The anode of the Organic Light Emitting Diode OLED is electrically connected, for the initialization control signal in initialization control line S (n-1)
Control under, the second node N2, the first node N1 and described organic is written in the initialization voltage Vinit by control
The anode of light emitting diode OLED is not shone with controlling the Organic Light Emitting Diode OLED；
The cathode of the Organic Light Emitting Diode OLED is connect with low-voltage end；The low-voltage end is for inputting low-voltage
VSS。
The present invention as shown in Figure 2 at work, the display cycle can also include be set to data write phase it
Between initial phase；
In initial phase, under the control of the initialization control signal of S (n-1) input, the initialization control circuit
The second node N2, the first node N1 and the organic light emission two is written in the initialization voltage Vinit by 16 controls
The anode of pole pipe OLED, so that the electricity of the second end of the current potential of the first end of the accumulator 12 and the accumulator 12
Position is all Vinit, is prepared for the data voltage write-in of data write phase；And the anode of OLED accesses Vinit, Vinit is small
In VSS, so that the cathode potential of OLED is higher than anode potential, OLED is in reverse bias condition, thus offset display during by
In the internal electric field that the displacement of foreign ion in the organic layer of OLED is formed, to restore the characteristic of OLED.
Specifically, the initialization control circuit may include the first initialization control transistor, the second initialization control
Transistor and third initialization control transistor；
The control electrode of the first initialization control transistor is connect with the initialization control line, first initialization
First pole of control transistor connect with initialization voltage line, and first initialization controls the second pole and described the of transistor
The connection of two nodes；
The control electrode of the second initialization control transistor is connect with the initialization control line, second initialization
First pole of control transistor connect with the second node, and second initialization controls the second pole and described the of transistor
The connection of one node；
The control electrode of the third initialization control transistor is connect with the initialization control line, the third initialization
First pole of control transistor is connect with the first node, the second pole of the third initialization control transistor and the hair
First pole of optical element connects.
In the specific implementation, the data write-in control line and the compensation control line can all be scan line.That is, logical
Crossing the scan line can be realized data write-in control and compensation control, can save space and simplify timing.
Specifically, the data write circuit may include data writing transistor and the first initialization writing transistor；
The control electrode of the data writing transistor is connect with data write-in control line, the data writing transistor
The first pole connect with data line, the second pole of the data writing transistor is connect with the first end of the driving circuit；Institute
It states data line and is used to provide the described data voltage；
The control electrode of the first initialization writing transistor is connect with data write-in control line, and described first is initial
The first pole for changing transistor is connect with initialization voltage line, the second pole of first initialization transistor and the second node
Connection；The initialization voltage line is used to provide the described initialization voltage.
Specifically, the compensation circuit may comprise compensating for transistor；
The control electrode of the compensation transistor is connect with the compensation control line, the first pole of the compensation transistor and institute
First node connection is stated, the second pole of the compensation transistor is connect with the second end of the driving circuit.
In the specific implementation, the emission control circuit may include the first light emitting control transistor, the second light emitting control
Transistor and third light emitting control transistor；
The control electrode of the first light emitting control transistor is connect with the light emitting control line, and first light emitting control is brilliant
First pole of body pipe is connect with the first voltage end, the second pole of the first light emitting control transistor and the driving circuit
First end connection；
The control electrode of the second light emitting control transistor is connect with the light emitting control line, and second light emitting control is brilliant
First pole of body pipe is connect with the second end of the driving circuit, the second pole of the second light emitting control transistor and the hair
Optical element connection；
The control electrode of the third light emitting control transistor is connect with the light emitting control line, and the third light emitting control is brilliant
First pole of body pipe is connect with the second node, the second pole of the third light emitting control transistor and the first voltage end
Connection.
Specifically, the driving circuit may include driving transistor, the accumulator may include storage capacitance；
The control terminal of the extremely described driving circuit of control of the driving transistor, the first of the driving transistor is extremely
The first end of the driving circuit, the second end of the second extremely described driving circuit of the driving transistor；
The first end of the storage capacitance is connect with the control terminal of the driving circuit, the second end of the storage capacitance with
Second node connection.
Illustrate pixel circuit of the present invention below by a specific embodiment.
As shown in figure 3, pixel circuit described in the embodiment of the present invention include Organic Light Emitting Diode OLED, driving circuit,
Accumulator, data write circuit, compensation circuit, emission control circuit and initialization control circuit, wherein
The driving circuit includes driving transistor DTFT；The accumulator includes storage capacitance Cst；The data are write
Entering circuit includes the initialization of data writing transistor T6 and first writing transistor T1；The compensation circuit includes compensation transistor
T7；The emission control circuit includes that the first light emitting control transistor T5, the second light emitting control transistor T9 and third shine and control
Transistor T1 processed；
The first end of the storage capacitance Cst is connect with the grid of the driving transistor DTFT, the storage capacitance Cst
Second end connect with second node N2；
The grid of the data writing transistor T6 is connect with scan line S (n), the source electrode of the data writing transistor T6
It is connect with data line Data, the drain electrode of the data writing transistor T6 is connect with the source electrode of the driving transistor DTFT；Institute
It states data line Data and is used to provide the described data voltage Vdata；
The grid of the first initialization writing transistor T1 is connect with data write-in control line EM, at the beginning of described first
The source electrode of beginningization transistor T1 is connect with initialization voltage line, the drain electrode of the first initialization transistor T1 and second section
Point N2 connection；The initialization voltage line is used to provide the described initialization voltage Vinit；
It is described compensation transistor T7 control electrode connect with the scan line S (n), it is described compensate transistor T7 source electrode and
The first node N1 connection, the drain electrode of the compensation transistor T7 are connect with the drain electrode of the driving transistor DTFT；
The grid of the first light emitting control transistor T5 is connect with the light emitting control line EM, first light emitting control
The source electrode of transistor T5 is connect with high voltage end, the drain electrode of the first light emitting control transistor T5 and the driving transistor
The source electrode of DTFT connects；
The grid of the second light emitting control transistor T9 is connect with the light emitting control line EM, second light emitting control
The source electrode of transistor T9 with it is described driving transistor DTFT drain electrode connect, the drain electrode of the second light emitting control transistor T9 and
The anode of the Organic Light Emitting Diode OLED connects；
The grid of the third light emitting control transistor T3 is connect with the light emitting control line EM, the third light emitting control
The source electrode of transistor T3 is connect with the second node N2, the drain electrode of the third light emitting control transistor T3 and the high voltage
End connection；
The initialization control circuit include first initialization control transistor T2, second initialization control transistor T4 and
Third initialization control transistor T8；
The grid of the first initialization control transistor T2 is connect with the initialization control line S (n-1), and described first
Initialization control transistor T2 source electrode connect with initialization voltage line, it is described first initialization control transistor T2 drain electrode and
The second node N2 connection；
The grid of the second initialization control transistor T4 is connect with the initialization control line S (n-1), and described second
The source electrode of initialization control transistor T4 is connect with the second node N2, the drain electrode of the second initialization control transistor T4
It is connect with the first node N1；
The grid of the third initialization control transistor T8 is connect with the initialization control line S (n-1), the third
The source electrode of initialization control transistor T8 is connect with the first node N1, the drain electrode of the third initialization control transistor T8
It is connect with the anode of the Organic Light Emitting Diode；
The cathode of the Organic Light Emitting Diode OLED is connect with low-voltage end；The low-voltage end is for providing low-voltage
VSS。
In the specific embodiment of pixel circuit of the present invention, the data write-in control line and compensation control
Line is all the scan line S (n).
In the specific embodiment of pixel circuit of the present invention, all transistors are all p-type thin film transistor, but
It is not limited.
As shown in figure 4, the specific embodiment of present invention pixel circuit as shown in Figure 3 is at work, the display cycle is (described
Display cycle can be a frame picture display time) it may include the initial phase t1 set gradually, data write-in node t2
With light emitting phase t3；
In initial phase t1, S (n-1) input low level, S (n) and EM input high levels, T2, T4 and T8 are opened,
T1, T3, T5, T6, T8 and T9 are closed, and the first end of Cst and the second end of Cst all access Vinit, initial to carry out to Cst
Change, and prepares for next stage data voltage Vdata write-in；By T8 write-in Vinit, (Vinit is less than the anode of OLED
VSS), so that the anode potential of the cathode potential ratio OLED of OLED is high, OLED is in reverse-bias state, to offset display
The internal electric field that part is formed by the displacement of foreign ion in OLED organic layer, to restore the characteristic of OLED；
In data write phase t2, S (n) input low level, S (n-1) and EM input high level, T1, T6 and T7 are opened,
T2, T3, T4, T5, T8 and T9 are closed, and since T7 is opened, DTFT is equivalent to diode, and Vdata is Cst by T6, DTFT and T7
Charging, to promote the current potential of N1, until DTFT turn off, the current potential of N1 become Vdata+Vth (Vth be DTFT threshold voltage,
Vth is less than 0), at this point, the current potential of N2 is Vinit；
In light emitting phase t3, EM input low level, S (n) and S (n-1) input high level, T3, T5 and T9 are opened, T1, T2,
T4, T6, T7 and T8 are closed, and are connected between N2 and high voltage end, and under the boot strap of Cst, the voltage change of N1 is Vdata+
Vth+VDD-Vinit；OLED shines under the driving of DTFT, and in saturation region, the current potential of the grid of DTFT is for DTFT work at this time
Vdata+Vth+VDD-Vinit；The voltage of the source electrode of DTFT is VDD, therefore the gate source voltage Vgs of DTFT is Vdata+Vth-
Vinit, until the initial phase of next frame picture display time；
It is as follows in the formula for the driving current Ioled that light emitting phase t3, DTFT drive OLED luminous:
Ioled=β (Vgs-Vth)2=β (Vdata-Vinit)2；
Wherein,μnIt is the electron mobility of DTFT, CoxIt is the insulation capacitor of unit area,It is the breadth length ratio of DTFT.
By above formula it is found that DTFT driving OLED luminous driving current is unrelated with the threshold voltage of DTFT, with VDD without
It closes, and β is the constant determined after display panel manufacturing process determines, therefore Ioled is only influenced by Vdata and Vinit.
And Vinit is different from being in place of VDD: Vinit only drives storage capacitance Cst, and only dynamic power consumption does not have quiescent dissipation, load
It is small very much, and only when this journey is arrived in scanning, Vinit just charges to storage capacitance Cst, and operating current is small.
Therefore the specific embodiment of pixel circuit of the present invention has the advantage that compensate for different location Vth poor
The different influence drifted about with Vth to show uniformity compensates for influence of IR pressure drop of the VDD along driving cabling to show uniformity,
The homogeneity that OLED is shown can be greatly improved；Reversing reset is carried out to OLED every a frame picture display time, prevents OLED
The characteristics of luminescence of OLED is stablized in the aging of characteristic.
Driving method described in the embodiment of the present invention is applied to above-mentioned pixel circuit, and the display cycle includes setting gradually
Data write phase and light emitting phase；The driving method may include:
In data write phase, under the control of data write control signal, data write circuit is controlled data voltage
Second node is written in initialization voltage by the first end of write driver circuit；Under the control of compensating control signal, compensation circuit
It controls and is connected between the control terminal and the second end of driving circuit of driving circuit, be accumulator charging by data voltage, with
The current potential of first node is promoted, until the driving circuit disconnects the company between its first end and the second end of the driving circuit
It connects；
In light emitting phase, under the control of LED control signal, emission control circuit control driving circuit first end with
First voltage is connected between end, and is controlled and be connected between the second end of the driving circuit and light-emitting component, and controls described
It is connected between one voltage end and the second node, under the action of accumulator, changes the voltage of the first node, so that
Obtain the driving circuit drives light-emitting component to shine under the control of its control terminal.
Specifically, the pixel circuit can also include initialization control circuit；The display cycle can also include setting
The initial phase being placed in front of the data write phase；The driving method can also include:
In initial phase, under the control of initialization control signal, the initialization control circuit control will be described first
The first pole of the second node, the first node and the light-emitting component is written in beginningization voltage, so that the energy storage is electric
The current potential of the second end of the current potential of the first end on road and the accumulator is all initialization voltage, and controls the light-emitting component
It does not shine.
Specifically, the light-emitting component can be Organic Light Emitting Diode, the first of the light-emitting component is extremely described to be had
The anode of machine light emitting diode；The driving method includes: in the initial phase, and the initialization control circuit passes through control
The initialization voltage is made less than the voltage that the cathode of the Organic Light Emitting Diode accesses, to control the organic light-emitting diodes
Pipe is in bias state.
Display panel described in the embodiment of the present invention includes above-mentioned pixel circuit.
Display device described in the embodiment of the present invention may include above-mentioned display panel.
Display device provided by the embodiment of the present invention can be mobile phone, tablet computer, television set, display, notebook
Any products or components having a display function such as computer, Digital Frame, navigator.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (13)
1. a kind of pixel circuit, which is characterized in that including light-emitting component, driving circuit, accumulator, data write circuit, benefit
Repay circuit and emission control circuit, wherein
The control terminal of the driving circuit is connect with first node, and the driving circuit is used for the control in the current potential of its control terminal
Under, it controls and is connected between the first end of the driving circuit and the second end of the driving circuit；
The first end of the accumulator is connect with the control terminal of the driving circuit, the second end of the accumulator and second
Node connection, the accumulator are used to control the current potential of the control terminal of the driving circuit；
The data write circuit is used under the control of the data write control signal of data write-in control line input, and control will
The first end of the driving circuit is written in data voltage, and the second node is written in initialization voltage；
The compensation circuit is used under the compensating control signal control of compensation control line input, controls the control of the driving circuit
It is connected between end processed and the second end of the driving circuit；
The emission control circuit is used under the control for the LED control signal that light emitting control line inputs, and controls the driving electricity
It is connected between the first end on road and first voltage end, and controls and connect between the second end of the driving circuit and the light-emitting component
It is logical, and control and be connected between the first voltage end and the second node.
2. pixel circuit as described in claim 1, which is characterized in that further include initialization control circuit；
The initialization control circuit is used under the control of the initialization control signal on initialization control line, and control will be described
The first pole of the second node, the first node and the light-emitting component is written in initialization voltage, to control described shine
Element does not shine；
Second pole of the light-emitting component is connect with second voltage end.
3. pixel circuit as claimed in claim 2, which is characterized in that the light-emitting component is Organic Light Emitting Diode；It is described
The anode of the extremely described Organic Light Emitting Diode of the first of light-emitting component, the extremely described organic light emission of the second of the light-emitting component
The cathode of diode；The initialization control circuit is in bias state for controlling the Organic Light Emitting Diode.
4. pixel circuit as claimed in claim 2, which is characterized in that the initialization control circuit includes the first initialization control
Transistor, the second initialization control transistor and third initialization control transistor processed；
The control electrode of the first initialization control transistor is connect with the initialization control line, the first initialization control
First pole of transistor is connect with initialization voltage line, the second pole of the first initialization control transistor and second section
Point connection；
The control electrode of the second initialization control transistor is connect with the initialization control line, the second initialization control
First pole of transistor is connect with the second node, the second pole of the second initialization control transistor and the first segment
Point connection；
The control electrode of the third initialization control transistor is connect with the initialization control line, the third initialization control
First pole of transistor is connect with the first node, the second pole of the third initialization control transistor and the luminous member
First pole of part connects.
5. the pixel circuit as described in any claim in Claims 1-4, which is characterized in that the data write circuit
Including data writing transistor and the first initialization writing transistor；
The control electrode of the data writing transistor and the data write-in control line are connect, and the of the data writing transistor
One pole is connect with data line, and the second pole of the data writing transistor is connect with the first end of the driving circuit；The number
Data voltage is used to provide the described according to line；
The control electrode of the first initialization writing transistor is connect with data write-in control line, and first initialization is brilliant
First pole of body pipe is connect with initialization voltage line, and the second pole of first initialization transistor and the second node connect
It connects；The initialization voltage line is used to provide the described initialization voltage.
6. the pixel circuit as described in any claim in Claims 1-4, which is characterized in that the compensation circuit includes
Compensate transistor；
The control electrode of the compensation transistor is connect with the compensation control line, first pole for compensating transistor and described the
Second pole of the connection of one node, the compensation transistor is connect with the second end of the driving circuit.
7. the pixel circuit as described in any claim in Claims 1-4, which is characterized in that the emission control circuit
Including the first light emitting control transistor, the second light emitting control transistor and third light emitting control transistor；
The control electrode of the first light emitting control transistor is connect with the light emitting control line, the first light emitting control transistor
The first pole connect with the first voltage end, the of the second pole of the first light emitting control transistor and the driving circuit
One end connection；
The control electrode of the second light emitting control transistor is connect with the light emitting control line, the second light emitting control transistor
The first pole connect with the second end of the driving circuit, the second pole of the second light emitting control transistor and the luminous member
Part connection；
The control electrode of the third light emitting control transistor is connect with the light emitting control line, the third light emitting control transistor
The first pole connect with the second node, the second pole of the third light emitting control transistor and the first voltage end connect
It connects.
8. the pixel circuit as described in any claim in Claims 1-4, which is characterized in that the driving circuit includes
Transistor is driven, the accumulator includes storage capacitance；
The control terminal of the extremely described driving circuit of control of the driving transistor, the first of the driving transistor are extremely described
The first end of driving circuit, the second end of the second extremely described driving circuit of the driving transistor；
The first end of the storage capacitance is connect with the control terminal of the driving circuit, the second end of the storage capacitance and second
Node connection.
9. a kind of driving method, applied to the pixel circuit as described in any claim in claim 1 to 8, feature exists
In the display cycle includes the data write phase and light emitting phase set gradually；The driving method includes:
In data write phase, under the control of data write control signal, data voltage is written for data write circuit control
Second node is written in initialization voltage by the first end of driving circuit；Under the control of compensating control signal, compensation circuit control
It is connected between the control terminal of driving circuit and the second end of driving circuit, is accumulator charging by data voltage, to be promoted
The current potential of first node, until the driving circuit disconnects the connection between its first end and the second end of the driving circuit；
In light emitting phase, under the control of LED control signal, emission control circuit controls the first end and first of driving circuit
It is connected between voltage end, and controls and be connected between the second end of the driving circuit and light-emitting component, and control first electricity
It is connected between pressure side and the second node, under the action of accumulator, changes the voltage of the first node, so that institute
State driving circuit drives light-emitting component to shine under the control of its control terminal.
10. driving method as claimed in claim 9, which is characterized in that the pixel circuit further includes initialization control circuit；
The display cycle further includes the initial phase before being set to the data write phase；The driving method further include:
In initial phase, under the control of initialization control signal, the initialization control circuit is controlled the initialization
The first pole of the second node, the first node and the light-emitting component is written in voltage, so that the accumulator
The current potential of the second end of the current potential of first end and the accumulator is all initialization voltage, and controls the light-emitting component and do not send out
Light.
11. driving method as claimed in claim 10, which is characterized in that the light-emitting component is Organic Light Emitting Diode, institute
State the anode of the first extremely described Organic Light Emitting Diode of light-emitting component；The driving method includes: in the initialization rank
Section, what the cathode that the initialization control circuit is less than the Organic Light Emitting Diode by controlling the initialization voltage accessed
Voltage is in bias state to control the Organic Light Emitting Diode.
12. a kind of display panel, which is characterized in that including the pixel electricity as described in any claim in claim 1 to 8
Road.
13. a kind of display device, which is characterized in that including display panel as claimed in claim 12.
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