CN107230455A - A kind of pixel-driving circuit, image element driving method and display base plate - Google Patents
A kind of pixel-driving circuit, image element driving method and display base plate Download PDFInfo
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- CN107230455A CN107230455A CN201710599606.5A CN201710599606A CN107230455A CN 107230455 A CN107230455 A CN 107230455A CN 201710599606 A CN201710599606 A CN 201710599606A CN 107230455 A CN107230455 A CN 107230455A
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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
- G09G3/3233—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 current through the light-emitting element
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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]
- G09G3/3266—Details of drivers for scan electrodes
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- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The embodiment of the invention discloses a kind of pixel-driving circuit, image element driving method and display base plate, wherein, pixel-driving circuit is by the way that traditional adjacent two single pixel driver element is combined, so that two pixel drive units share a data line, there is the pixel-driving circuit of valve value compensation function to carry out the jump compensation to the threshold value of driver element in corresponding compensated stage respectively in two pixel cells of control driving using one, the number of the thin film transistor (TFT) and data wire for compensation is compressed simultaneously, the aperture opening ratio and cost of pixel cell can be greatly reduced, so as to obtain the number of pixels that higher image quality and per inch are possessed.
Description
Technical field
The present invention relates to display technology field, espespecially a kind of pixel-driving circuit, image element driving method and display base plate.
Background technology
Active matrix organic light-emitting diode (Active Matrix/Organic Light Emitting Diode, letter
Claim AMOLED) it is one of the focus in current display research field.With liquid crystal display (Liquid Crystal Display,
Abbreviation LCD) compare, Organic Light Emitting Diode OLED has low low energy consumption, production cost, self-luminous, wide viewing angle and response speed
Fast the advantages of.
Wherein, pixel-driving circuit is the core technology of displayer, is shown in AMOLED, wherein it is desired to stable
Electric current come control OLED light.Fig. 1 is the structural representation of traditional pixel-driving circuit, as shown in figure 1, traditional AMOLED
Pixel-driving circuit is 1 driving transistor DTFT, 1 switching transistor T1 and 1 storage using 2T1C pixel-driving circuits
Electric capacity Cs.When scan line gating (scans) certain a line, scan line Scan is low level signal, T1 conductings, data wire Data
On data-signal Vdata write-in storage capacitance Cs, after the row end of scan, Vscan is changed into high level signal, T1 shut-offs,
The grid voltage driving DTFT on storage capacitance Cs is stored in, makes it produce electric current to drive OLED, it is ensured that OLED is aobvious in a frame
Show interior continuous illumination.Current formulas of the DTFT when reaching saturation is IOLED=K (VGs-Vth)2.Because manufacturing process and device are old
The reasons, the DTFT of each pixel cell threshold voltage V such as changethIt can drift about, which results in the electric current for flowing through each OLED
Because of VthChange and change；Further, since the threshold voltage of the driving transistor of each pixel has inhomogeneities, can directly it lead
The electric current for flowing through each pixel OLED is caused to change so that display brightness is uneven, so as to influence the display of whole image to imitate
Really.
In order to ensure the display quality of displayer, the pixel-driving circuit of prior art typically uses 6T1C pixels
Drive circuit realizes valve value compensation function, although meet the requirement of compensation threshold value, but employs excessive transistor and line
Road, and existing pixel-driving circuit is arranged in each pixel cell so that the aperture opening ratio height of pixel cell can not
The number of pixels (Pixels per inch, abbreviation PPI) that the higher image quality of acquisition and per inch are possessed.
The content of the invention
In order to solve the above-mentioned technical problem, the invention provides a kind of pixel-driving circuit, image element driving method and display
Substrate, to solve due to picture caused by the prior art when carrying out valve value compensation more than the number of the TFT that uses and data wire
Plain unit aperture opening ratio is high so that more preferable image quality and PPI technical problem can not be obtained.
In order to reach the object of the invention, the invention provides a kind of pixel-driving circuit, for driving the first light-emitting component
With the second light-emitting component, it is arranged in two adjacent pixel units, including：Reset signal end, data signal end, the first scanning letter
Number end, the second scanning signal end, the first drive signal end, the second drive signal end and power end；Also include：First pixel driver
Unit and the second pixel drive unit；
First pixel drive unit includes：First control unit, the first memory cell and the first driver element；
First control unit, respectively with data signal end, reset signal end, the first scanning signal end, the first drive signal
End and first node connection, in reset phase, under the control at the first drive signal end and reset signal end, to first segment
The current potential of point is reset, and is additionally operable in the first compensated stage, right under the control of the first scanning signal end and data signal end
The current potential of first node is charged, until first threshold；
First memory cell, is connected with first node and power end, for storing between first node and power end respectively
Voltage；
First driver element, is connected with the second drive signal end, first node and power end respectively, in luminous rank
Section, under the control at the second scanning signal end, to the first light-emitting component output driving current；
Second pixel drive unit includes：Second control unit, the second memory cell and the second driver element；
Second control unit, respectively with data signal end, reset signal end, the second scanning signal end, the first drive signal
End and Section Point connection, in reset phase, under the control at the first drive signal end and reset signal end, to second section
The current potential of point is reset, and is additionally operable in the second compensated stage, right under the control of the second scanning signal end and data signal end
The current potential of Section Point is charged, until Second Threshold；
Second memory cell, is connected with Section Point and power end, for storing between Section Point and power end respectively
Voltage；
Second driver element, is connected with the second drive signal end, Section Point and power end respectively, in luminous rank
Section, under the control at the second scanning signal end, to the second light-emitting component output driving current.
Further, first control unit, including：First switch transistor, the first driving transistor and the 3rd are opened
Close transistor；
The grid of the first switch transistor is connected with the first scanning signal end, and the first pole is connected with data signal end,
Second pole is connected with the first pole of the first driving transistor；
The grid of first driving transistor is connected with first node, the second pole and the first pole of the 3rd switching transistor
Connection；
The grid of 3rd switching transistor is connected with the first drive signal end, and the second pole is connected with reset signal end：
Second control unit, including：Second switch transistor, the 4th driving transistor and the 4th switching transistor；
The grid of the second switch transistor is connected with the second scanning signal end, and the first pole is connected with data signal end,
Second pole is connected with the first pole of the 4th driving transistor；
The grid of 4th driving transistor is connected with Section Point, the second pole and the first pole of the 4th switching transistor
Connection；
The grid of 4th switching transistor is connected with the first drive signal end, and the second pole is connected with reset signal end.
Further, the first threshold is the difference of the threshold voltage of first voltage and the first driving transistor, described
First voltage is the magnitude of voltage of the data-signal provided in the first compensated stage data signal end, and the Second Threshold is the second electricity
Pressure and the difference of the threshold voltage of the 4th driving transistor, the second voltage is provides in the second compensated stage data signal end
Data-signal magnitude of voltage.
Further, first memory cell includes：First electric capacity；
The first end of first electric capacity is connected with first node, and the second end is connected with power end；
Second memory cell includes：Second electric capacity；
The first end of second electric capacity is connected with Section Point, and the second end is connected with power end.
Further, first driver element includes：Second driving transistor and the 5th switching transistor；
The grid of second driving transistor is connected with Section Point, and the first pole is connected with power end, the second pole and the
The first pole connection of five switching transistors；
The grid of 5th switching transistor is connected with the second drive signal end, the second pole and the sun of the first light-emitting component
Pole is connected；
Second driver element includes：3rd driving transistor and the 6th switching transistor；
The grid of 3rd driving transistor is connected with Section Point, and the first pole is connected with power end, the second pole and the
The first pole connection of six switching transistors；
The grid of 6th switching transistor is connected with the second drive signal end, and the second pole and the anode of the second light-emitting component connect
Connect.
Further, two adjacent pixel units include：Adjacent red pixel cell and green pixel cell, Huo Zhexiang
Adjacent green pixel cell and blue pixel cells.
Further, in first pixel drive unit, the first driving transistor, the second driving transistor, first
Switching transistor, the 3rd switching transistor and the 5th switching transistor are P-type TFT, in second pixel driver
In unit, the 3rd driving transistor, the 4th driving transistor, second switch transistor, the 4th switching transistor and the 6th switch
Transistor is P-type TFT.
Further, in reset phase, the input signal at the first drive signal end is low level；In the first compensated stage,
The input signal at the first scanning signal end is low level, and in the second compensated stage, the input signal at the second scanning signal end is low
Level；In glow phase, the input signal at the second drive signal end is low level.
In addition, the embodiment of the present invention also provides a kind of display base plate, including pixel-driving circuit.
In addition, the embodiment of the present invention also provides a kind of image element driving method, for driving pixel-driving circuit, including：
In reset phase, the first control unit is under the control at the first drive signal end and reset signal end, to first segment
The current potential of point is reset, and the second control unit is under the control at the first drive signal end and reset signal end, to Section Point
Current potential reset；
In the first compensated stage, the first control unit is under the control of the first scanning signal end and data signal end, to
The current potential of one node is charged, until first threshold；In the first compensated stage, the data voltage saltus step of data signal end is the
One voltage；
In the second compensated stage, the second control unit is under the control of the second scanning signal end and data signal end, to
The current potential of two nodes is charged, until Second Threshold；In the second compensated stage, the data voltage saltus step of data signal end is the
Two voltages；
In glow phase, under the first driver element is controlled at the second scanning signal end, to the first light-emitting component output driving
Electric current, under the second driver element is controlled at the second scanning signal end, to the second light-emitting component output driving current.
Pixel-driving circuit, image element driving method and display base plate that the embodiment of the present invention is provided, wherein, the pixel is driven
Dynamic circuit, by the way that traditional adjacent two single pixel driver element is combined so that two pixel drive units share one
Data wire, has the pixel-driving circuit of valve value compensation function to drive two pixel cells respectively in phase in control using one
The compensated stage answered carries out the jump compensation to the threshold value of driver element, while compressing the TFT and data wire for compensation
Number, can be greatly reduced the aperture opening ratio and cost of pixel cell, so as to obtain higher image quality and PPI.
Certainly, any product or method for implementing the present invention it is not absolutely required to while reaching all the above excellent
Point.Other features and advantages of the present invention will be illustrated in subsequent specification embodiment, also, partly be implemented from specification
Become apparent, or understood by implementing the present invention in example.The purpose of the embodiment of the present invention and other advantages can pass through
Specifically noted structure is realized and obtained in specification, claims and accompanying drawing.
Brief description of the drawings
Accompanying drawing is used for providing further understanding technical solution of the present invention, and constitutes a part for specification, with this
The embodiment of application is used to explain technical scheme together, does not constitute the limitation to technical solution of the present invention.
Fig. 1 is the structural representation of traditional pixel-driving circuit；
Fig. 2 is the structured flowchart for the pixel-driving circuit that the embodiment of the present invention one is provided；
Fig. 3 is the equivalent circuit diagram for the pixel-driving circuit that the embodiment of the present invention one is provided；
Fig. 4 is the working timing figure for the pixel-driving circuit that the embodiment of the present invention one is provided；
Fig. 5 A are working state figure of the pixel-driving circuit in reset phase of the offer of the embodiment of the present invention one；
Fig. 5 B are working state figure of the pixel-driving circuit in the first compensated stage of the offer of the embodiment of the present invention one；
Fig. 5 C are working state figure of the pixel-driving circuit in the second compensated stage of the offer of the embodiment of the present invention one；
Fig. 5 D are working state figure of the pixel-driving circuit in glow phase of the offer of the embodiment of the present invention one；
Fig. 6 A are a schematic diagram of the pixel cell that the pixel-driving circuit that the embodiment of the present invention one is provided is arranged at；
Fig. 6 B are another schematic diagram for the pixel cell that the pixel-driving circuit that the embodiment of the present invention one is provided is arranged at；
Fig. 7 is the flow chart for the image element driving method that the embodiment of the present invention two is provided.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with accompanying drawing to the present invention
Embodiment be described in detail.It should be noted that in the case where not conflicting, in the embodiment and embodiment in the application
Feature can mutually be combined.
It will be understood by those skilled in the art that the switching transistor and driving transistor that are used in all embodiments of the application
Can be thin film transistor (TFT) or FET or other characteristic identical devices.Preferably, used in the embodiment of the present invention
Thin film transistor (TFT) can be oxide semi conductor transistor.Because the source electrode of the switching transistor that uses here, drain electrode are symmetrical
, so its source electrode, drain electrode can be exchanged.In embodiments of the present invention, to distinguish the two poles of the earth of transistor in addition to grid, by it
In an electrode be referred to as the first pole, another electrode is referred to as the second pole, and first can be extremely source electrode or drain electrode, and second extremely can be
Drain electrode or source electrode.
Embodiment one：
Fig. 2 is the structured flowchart for the pixel-driving circuit that the embodiment of the present invention one is provided, as shown in Fig. 2 the present invention is implemented
Example provides a kind of pixel-driving circuit, for driving the first light-emitting component and the second light-emitting component, is arranged at two adjacent pixels
In unit, including：Reset signal end INT, data signal end Data, the first scanning signal end Scan1, the second scanning signal end
Scan2, the first drive signal end Rm1, the second drive signal end Rm1 and power end Ldd；Also include：First pixel drive unit
With the second pixel drive unit.
In the present embodiment, the first pixel drive unit includes：First control unit, the first memory cell and the first driving
Unit；First control unit, respectively with data signal end Data, reset signal end INT, the first scanning signal end Scan1, first
Drive signal end Rm1 and first node a connections, in reset phase, at the first drive signal end Rm1 and reset signal end
Under INT control, first node a current potential is reset, is additionally operable in the first compensated stage, at the first scanning signal end
Under Scan1 and data signal end Data control, first node a current potential is charged, until first threshold；First storage
Unit, is connected with first node a and power end Ldd respectively, in reset phase and the first compensated stage storage first node a
With the voltage between power end Ldd；First driver element, respectively with the second drive signal end Rm2, first node a and power end
Ldd connections, in glow phase, in the control of the second scanning signal end Scan2 and the voltage for being stored in the first memory cell
Under, to the first light-emitting component output driving current.
Second pixel drive unit includes：Second control unit, the second memory cell and the second driver element；Second control
Unit, respectively with data signal end Data, reset signal end INT, the second scanning signal end Scan2, the first drive signal end Rm1
With Section Point b connections, it is right under the first drive signal end Rm1 and reset signal end INT control in reset phase
Section Point b current potential is reset, and is additionally operable in the second compensated stage, in the second scanning signal end Scan2 and data-signal
Under the control for holding Data, Section Point b current potential is charged, until Second Threshold；Second memory cell, respectively with second
Node b and power end Ldd connections, for storing the voltage between Section Point b and power end Ldd；Second driver element, respectively
It is connected with the second drive signal end Rm2, Section Point b and power end Ldd, in glow phase, at the second scanning signal end
Scan2 and it is stored under the control of the voltage of the second memory cell, to the second light-emitting component output driving current.
Wherein, the first light-emitting component and the second light-emitting component can be Organic Light Emitting Diode, and the first light-emitting component and
The minus earth of second light-emitting component.
It should be noted that power end Ldd, specially power line, for providing voltage V for pixel-driving circuitdd, its
In, VddIt is continuously high level；Data signal end Data, specially signal wire, for providing data-signal, the voltage of data-signal
For Vdata；First scanning signal end Scan1 and the second scanning signal end Scan2, sweeps for providing the first scanning signal and second
Signal is retouched, the voltage of the first scanning signal is Vscan1, the voltage of the first scanning signal is Vscan2；First drive signal end Em1 and
Second drive signal end Em2, for providing the first control signal and the second control signal, the voltage of the first control signal is Vem1,
The voltage of first scanning signal is Vem2；Reset signal end INT, the current potential reset signal for providing first node, current potential is reset
The voltage of signal is Vint, wherein, Vint0 can be equal to, or can also be low level.
Fig. 3 is the equivalent circuit diagram for the pixel-driving circuit that the embodiment of the present invention one is provided；First has been shown in particular in Fig. 3
The example arrangement of control unit, the first memory cell and the first driver element.Skilled addressee readily understands that being, the above
The implementation not limited to this of each unit, as long as its respective function can be realized.
As shown in figure 3, in pixel-driving circuit according to embodiments of the present invention, in the first pixel drive unit, the
One control unit includes：First switch transistor T1, the first driving transistor M1 and the 3rd switching transistor T3；First switch is brilliant
Body pipe T1 grid is connected with the first scanning signal end Scan1, and the first pole is connected with data signal end Data, the second pole and first
Driving transistor M1 the first pole connection；First driving transistor M1 grid is connected with first node a, and the second pole is opened with the 3rd
Close transistor T3 the first pole connection；3rd switching transistor T3 grid is connected with the first drive signal end Rm1, the second pole with
The INT connections of reset signal end.First memory cell includes：First electric capacity C1；First electric capacity C1 first end connects with first node a
Connect, the second end is connected with power end Ldd；First driver element includes：Second driving transistor M2 and the 5th switching transistor T5；
Second driving transistor M2 grid is connected with Section Point b, and the first pole is connected with power end Ldd, the second pole and the 5th switch
Transistor T5 the first pole connection；5th switching transistor T5 grid is connected with the second drive signal end Rm2, the second pole and the
One light-emitting component OLED1 anode connection.
In the second pixel drive unit, the second control unit, including：Second switch transistor T2, the 4th driving crystal
Pipe M4 and the 4th switching transistor T4；Second switch transistor T2 grid is connected with the second scanning signal end Scan2, the first pole
It is connected with data signal end Data, the second pole is connected with the 4th driving transistor M4 the first pole；4th driving transistor M4's
Grid is connected with Section Point b, and the second pole is connected with the 4th switching transistor T4 the first pole；4th switching transistor T4 grid
Pole is connected with the first drive signal end Rm1, and the second pole is connected with reset signal end INT.Second memory cell includes the second electric capacity
C2；Second electric capacity C2 first end is connected with Section Point b, and the second end is connected with power end Ldd；Second driver element includes：
3rd driving transistor M3 and the 6th switching transistor T6；3rd driving transistor M3 grid is connected with Section Point b, and first
Pole is connected with power end Ldd, and the second pole is connected with the 6th switching transistor T6 the first pole；6th switching transistor T6 grid
It is connected with the second drive signal end Rm2, the second pole is connected with the second light-emitting component OLED2 anode.
In the present embodiment, first threshold is the difference of first voltage V1 and the first driving transistor M1 threshold voltage,
First voltage V1 is in the magnitude of voltage V of the first compensated stage data signal end Data data-signals provideddata, Second Threshold is
The difference of second voltage V2 and the 4th driving transistor M4 threshold voltage, second voltage V1 is in the second compensated stage data letter
Number end Data provide data-signal magnitude of voltage Vdata.It should be noted that second voltage is more than first voltage.
It should be noted that in the first pixel drive unit, the first driving transistor M1, the second driving transistor M2,
First switch transistor T1, the 3rd switching transistor T3 and the 5th switching transistor T5 are P-type TFT, in the second picture
In plain driver element, the 3rd driving transistor M3, the 4th driving transistor M4, second switch transistor T2, the 4th switch crystal
Pipe T4 and the 6th switching transistor T6 is P-type TFT, can unify technological process, can reduce displayer
Manufacturing process, be favorably improved the yield of product；In addition, the control end in above-mentioned pixel-driving circuit includes：Data-signal
End, the first drive signal end and the second drive signal end, the port for control has three, can save the pixel-driving circuit
Energy consumption, while the interference between circuit can also be reduced.
The technical scheme of the embodiment of the present invention is further illustrated below by the course of work of pixel-driving circuit.
Fig. 4 is the working timing figure for the pixel-driving circuit that the embodiment of the present invention one is provided；Fig. 5 A are the embodiment of the present invention
Working state figure of one pixel-driving circuit provided in reset phase；Fig. 5 B are the pixel driver that the embodiment of the present invention one is provided
Working state figure of the circuit in the first compensated stage；Fig. 5 C are that the pixel-driving circuit that the embodiment of the present invention one is provided is mended second
Repay the working state figure in stage；Fig. 5 D are working condition of the pixel-driving circuit in glow phase of the offer of the embodiment of the present invention one
Figure；As shown in Figures 3 and 4, pixel-driving circuit provided in an embodiment of the present invention includes：6 controlling transistors (T1~T6), 4
Driving transistor (M1~M4), 2 capacitor cells (C1 and C2), 7 inputs (Data, Ldd, INT, Scan1, Scan2, Em1
And Em2), its course of work includes：
First stage S1, i.e. reset phase：First drive signal end Em1 input signal is low level, the first scanning letter
The input letter of number end Scan1 input signal, the second scanning signal end Scan2 input signal and the second drive signal end Em2
Number it is high level.
As shown in Figure 5A, the 3rd switching transistor T3 and the 4th switching transistor T4 conductings, first node a and Section Point
Voltage is reset to V by b by reset signal end INTint, first node a and Section Point b low level causes the first driving brilliant
Body pipe M1 and the second driving transistor M2 conductings, the 3rd driving transistor M3 and the 4th driving transistor M4 conductings, wherein, Vint
Can be 0, now, first node a and Section Point b current potential remain 0V.
Second stage S2, i.e. the first compensated stage：First scanning signal end Scan1 input signal is low level, second
Scanning signal end Scan2 input signal, the first drive signal end Em1 input signal and the second drive signal end Em2 it is defeated
It is high level to enter signal EM2, now the voltage V for the data-signal that data signal end Data is provideddata=V1。
As shown in Figure 5 B, first switch transistor T1 is turned on, and the first driving transistor M1 is also turned on, and data-signal can pass through
First switch transistor T1 and the first driving transistor M1 are charged to first node a, and V is charged to always1-Vth1Untill, its
In, Vth1For the first driving transistor M1 threshold voltage, now, the electrical potential difference at the first electric capacity C1 two ends is Vdd-(V1-Vth1)。
Phase III S3, i.e. the second compensated stage, the second scanning signal end Scan2 input signal is low level, first
Scanning signal end Scan1 input signal, the first drive signal end Em1 input signal EM1 and the second drive signal end Em2
Input signal is high level, now the voltage V for the data-signal that data wire Data is provideddata=V2。
As shown in Figure 5 C, second switch transistor T2 is turned on, and the 4th driving transistor M4 is also turned on, and data-signal can pass through
Second switch transistor T2 and the 4th driving transistor M4 are charged to Section Point b, and V is charged to always2-Vth4Untill, its
In, Vth4For the 4th driving transistor M4 threshold voltage, now, the electrical potential difference at the second electric capacity C2 two ends is Vdd-(V2-Vth4)。
Fourth stage S4, i.e. glow phase：Second drive signal end Em2 input signal is low level, the first scanning letter
Number end Scan1 input signal, the second scanning signal end Scan2 input signal are low level and the first drive signal end Em1
Input signal be high level, now data wire Data provide data-signal voltage Vdata=0.
After voltage compensation twice, saltus step process, situation is turned on as shown in Figure 5 D, the second driving transistor M2 and the 3rd
Driving transistor M3 is turned on, and the 5th switching transistor T5 and the 6th switching transistor T6 are also turned on, now, the second driving transistor
The voltage of M2 and the 3rd driving transistor M3 the first pole is Vdd, the first light-emitting component OLED1 and the second light-emitting component OLED2 are logical
Respective path is crossed to be lighted.
The electric current that can obtain flowing through the first light-emitting component OLED1 by TFT saturation currents formula is met
IOLED1=K (VGs1-Vth2)2
=K [Vdd-(V1-Vth1)-Vth2]2
=K (Vdd-V1)2
Wherein, K is the fixed constant relevant with physical dimension with the technological parameter of driving transistor, VGS1For the second driving
Transistor M2 gate source voltage, Vth1With Vth2It is the first driving transistor M1 and the second driving transistor M2 threshold voltage, root
According to mirror image circuit principle, it is believed that Vth1With Vth2Approximately equal, i.e. Vth1=Vth2。
Similarly, the electric current for flowing through the second light-emitting component OLED2 is K (Vdd-V2)2
The pixel drive unit that two of script have valve value compensation function it can be seen from Fig. 3 and Fig. 5 A-5D is merged
For a pixel-driving circuit, and controlled by a data signal end Data, wherein, T1-T6 is for switch TFT, M1-M4
TFT is driven, Scan1, Scan2, Em1 and Em2 are scanning signals, and controlling switch TFT is turned on or off.
In reset phase, the first drive signal end Rm1 input signal is low level；Swept in the first compensated stage, first
The input signal for retouching signal end Scan1 is low level, in the second compensated stage, the second scanning signal end Scan2 input signal
For low level；In glow phase, the second drive signal end Rm2 input signal is low level.
Pixel-driving circuit provided in an embodiment of the present invention by successively to the pixel cell including the first light-emitting component with
And pixel cell including the second light-emitting component carries out jump compensation, by applying skip signal to data wire, i.e., when different
Area realizes pixel compensation by way of Signal averaging saltus step, solve double image vegetarian refreshments driving TFT due to manufacturing process and it is long when
Between operation cause the inhomogenous problem of threshold voltage so that the electric current for flowing through two pixel cells including OLED is not driven crystalline substance
The influence of the threshold voltage of body pipe, finally ensure that the uniformity that image is shown, and reset logical with compensated stage guarantee no current
OLED is crossed, OLED service life is improved indirectly.
In addition, having from being set in each pixel cell of the prior art unlike pixel-driving circuit, this hair
The pixel-driving circuit that bright embodiment is provided is arranged in two adjacent pixel units in pixel-driving circuit, the two adjacent picture
The plain data wire of units shared one, for example, can be that the pixel-driving circuit described in the embodiment of the present invention is arranged at adjacent red
Pixel driver circuit in pixel cell R and green pixel cell G or described in the embodiment of the present invention is arranged at adjacent
In green pixel cell and blue pixel cells B.
Specifically, one of the pixel cell that the pixel-driving circuit that Fig. 6 A are the offer of the embodiment of the present invention one is arranged at is shown
It is intended to；Fig. 6 A are illustrated so that pixel-driving circuit is arranged at adjacent red pixel cell R and green pixel cell G as an example
, Fig. 6 B are another schematic diagram for the pixel cell that the pixel-driving circuit that the embodiment of the present invention one is provided is arranged at, and Fig. 6 B are
Illustrated so that pixel-driving circuit is arranged at adjacent green pixel cell G and blue pixel cells B as an example.
It should be noted that D1, D2, D3 in Fig. 6 A and 6B are adjacent data wire, S (n) and S (n+1) are adjacent
Scan line.
The pixel-driving circuit that the embodiment of the present invention is provided is by by traditional adjacent two single pixel driver element
Combination so that two pixel drive units share a data line, has the pixel driver of valve value compensation function electric using one
Road to carry out the jump compensation to the threshold value of driver element in corresponding compensated stage respectively in two pixel cells of control driving,
The number of the TFT and data wire for compensation are compressed simultaneously, and the aperture opening ratio and cost of pixel cell can be greatly reduced, so that
The higher image quality of acquisition and PPI.
Embodiment two：
Based on foregoing invention design, Fig. 7 is the flow chart for the image element driving method that the embodiment of the present invention two is provided, such as Fig. 7
Shown, the embodiments of the invention provide a kind of image element driving method, for driving pixel-driving circuit, this method is specifically included：
Step 100, in reset phase, the first control unit under the control at the first drive signal end and reset signal end,
The current potential of first node is reset, the second control unit is right under the control at the first drive signal end and reset signal end
The current potential of Section Point is reset.
Specifically, after resetting, the current potential of first node and the current potential of Section Point can be 0, or be low level.
Step 200, in the first compensated stage, control of first control unit in the first scanning signal end and data signal end
Under, the current potential of first node is charged, until first threshold；In the first compensated stage, the data voltage of data signal end
Saltus step is first voltage.
Wherein, first threshold is the difference of the threshold voltage of first voltage and the first driving transistor, first voltage be
The magnitude of voltage for the data-signal that first compensated stage data signal end is provided.
Step 300, in the second compensated stage, control of second control unit in the second scanning signal end and data signal end
Under, the current potential of Section Point is charged, until Second Threshold；In the second compensated stage, the data voltage of data signal end
Saltus step is second voltage.
Wherein, Second Threshold is the difference of the threshold voltage of second voltage and the 4th driving transistor, second voltage be
The magnitude of voltage for the data-signal that second compensated stage data signal end is provided.It should be noted that second voltage is more than the first electricity
Pressure.
Step 400, in glow phase, the first driver element is under the control at the second scanning signal end, to the first luminous member
Part output driving current, the second driver element is under the control at the second scanning signal end, to the second light-emitting component output driving electricity
Stream.
Wherein, pixel-driving circuit is the pixel-driving circuit that embodiment one is provided, and its realization principle and realizes effect class
Seemingly, it will not be repeated here.
Image element driving method provided in an embodiment of the present invention by successively to the pixel cell including the first light-emitting component with
And pixel cell including the second light-emitting component carries out jump compensation, by applying skip signal to data wire, i.e., when different
Area realizes pixel compensation by way of Signal averaging saltus step, solve double image vegetarian refreshments driving TFT due to manufacturing process and it is long when
Between operation cause the inhomogenous problem of threshold voltage so that the electric current for flowing through two pixel cells including OLED is not driven crystalline substance
The influence of the threshold voltage of body pipe, finally ensure that the uniformity that image is shown, and reset logical with compensated stage guarantee no current
OLED is crossed, OLED service life is improved indirectly.
The image element driving method that the embodiment of the present invention is provided, wherein, by driving by the single picture of traditional adjacent two
The pixel-driving circuit that plain driver element combination is obtained so that two pixel drive units share a data line, use one
Pixel-driving circuit with valve value compensation function come control driving two pixel cells enter respectively in corresponding compensated stage
Row, while compressing the number of the TFT and data wire for compensation, can significantly drop to the jump compensation of the threshold value of driver element
The aperture opening ratio and cost of low pixel unit, so as to obtain higher image quality and PPI.
Embodiment three
Based on foregoing invention design, the embodiment of the present invention additionally provides a kind of display base plate, including pixel-driving circuit.
Wherein, pixel-driving circuit is the pixel-driving circuit that embodiment one is provided, and its realization principle and realizes effect class
Seemingly, it will not be repeated here.
Preferably, the display base plate can be active matrix organic light-emitting diode AMOLED display base plates.
The embodiment of the present invention provides display base plate and is preferred to use low-temperature polysilicon silicon technology (Low TemperaturePoly-
Silicon, abbreviation LTPS) under processing procedure, the design of this multiple transistors and multiple electric capacity does not interfere with the opening of module
Rate.
It should be noted that display base plate provided in an embodiment of the present invention can also use amorphous silicon technology.It is noted that
The pixel-driving circuit that the embodiment of the present invention is provided can use the thin film transistor (TFT) of the techniques such as non-crystalline silicon, polysilicon, oxide.
The type for the thin film transistor (TFT) that pixel-driving circuit described in the embodiment of the present invention is used can be according to actual needs
Change.Although moreover, be illustrated in above-described embodiment by taking active matrix organic light-emitting diode as an example, but the present invention is not
It is limited to the display base plate using active matrix organic light-emitting diode, can also be applied to using other various light emitting diodes
Display base plate.
Although disclosed herein embodiment as above, described content be only readily appreciate the present invention and use
Embodiment, is not limited to the present invention.Technical staff in any art of the present invention, is taken off not departing from the present invention
On the premise of the spirit and scope of dew, any modification and change, but the present invention can be carried out in the form and details of implementation
Scope of patent protection, still should be subject to the scope of the claims as defined in the appended claims.
Claims (10)
1. a kind of pixel-driving circuit, for driving the first light-emitting component and the second light-emitting component, it is characterised in that be arranged at two
In individual adjacent pixel unit, including：Reset signal end, data signal end, the first scanning signal end, the second scanning signal end,
One drive signal end, the second drive signal end and power end；Also include：First pixel drive unit and the second pixel driver list
Member；
First pixel drive unit includes：First control unit, the first memory cell and the first driver element；
First control unit, respectively with data signal end, reset signal end, the first scanning signal end, the first drive signal end and
First node is connected, in reset phase, under the control at the first drive signal end and reset signal end, to first node
Current potential is reset, and is additionally operable in the first compensated stage, under the control of the first scanning signal end and data signal end, to first
The current potential of node is charged, until first threshold；
First memory cell, is connected with first node and power end respectively, for storing the electricity between first node and power end
Pressure；
First driver element, is connected with the second drive signal end, first node and power end respectively, in glow phase,
Under the control at the second scanning signal end, to the first light-emitting component output driving current；
Second pixel drive unit includes：Second control unit, the second memory cell and the second driver element；
Second control unit, respectively with data signal end, reset signal end, the second scanning signal end, the first drive signal end and
Section Point is connected, in reset phase, under the control at the first drive signal end and reset signal end, to Section Point
Current potential is reset, and is additionally operable in the second compensated stage, under the control of the second scanning signal end and data signal end, to second
The current potential of node is charged, until Second Threshold；
Second memory cell, is connected with Section Point and power end respectively, for storing the electricity between Section Point and power end
Pressure；
Second driver element, is connected with the second drive signal end, Section Point and power end respectively, in glow phase,
Under the control at the second scanning signal end, to the second light-emitting component output driving current.
2. pixel-driving circuit according to claim 1, it is characterised in that first control unit, including：First opens
Close transistor, the first driving transistor and the 3rd switching transistor；
The grid of the first switch transistor is connected with the first scanning signal end, and the first pole is connected with data signal end, and second
Pole is connected with the first pole of the first driving transistor；
The grid of first driving transistor is connected with first node, and the second pole and the first pole of the 3rd switching transistor connect
Connect；
The grid of 3rd switching transistor is connected with the first drive signal end, and the second pole is connected with reset signal end；
Second control unit, including：Second switch transistor, the 4th driving transistor and the 4th switching transistor；
The grid of the second switch transistor is connected with the second scanning signal end, and the first pole is connected with data signal end, and second
Pole is connected with the first pole of the 4th driving transistor；
The grid of 4th driving transistor is connected with Section Point, and the second pole and the first pole of the 4th switching transistor connect
Connect；
The grid of 4th switching transistor is connected with the first drive signal end, and the second pole is connected with reset signal end.
3. pixel-driving circuit according to claim 2, it is characterised in that the first threshold is first voltage and first
The difference of the threshold voltage of driving transistor, the first voltage is believed for the data provided in the first compensated stage data signal end
Number magnitude of voltage, the Second Threshold is the difference of the threshold voltage of second voltage and the 4th driving transistor, second electricity
Press the magnitude of voltage of the data-signal to be provided in the second compensated stage data signal end.
4. the pixel-driving circuit according to Claims 2 or 3, it is characterised in that first memory cell includes：First
Electric capacity；
The first end of first electric capacity is connected with first node, and the second end is connected with power end；
Second memory cell includes：Second electric capacity；
The first end of second electric capacity is connected with Section Point, and the second end is connected with power end.
5. pixel-driving circuit according to claim 4, it is characterised in that first driver element includes：Second drives
Dynamic transistor and the 5th switching transistor；
The grid of second driving transistor is connected with Section Point, and the first pole is connected with power end, and the second pole is opened with the 5th
Close the first pole connection of transistor；
The grid of 5th switching transistor is connected with the second drive signal end, and the second pole and the anode of the first light-emitting component connect
Connect；
Second driver element includes：3rd driving transistor and the 6th switching transistor；
The grid of 3rd driving transistor is connected with Section Point, and the first pole is connected with power end, and the second pole is opened with the 6th
Close the first pole connection of transistor；
The grid of 6th switching transistor is connected with the second drive signal end, and the second pole and the anode of the second light-emitting component connect
Connect.
6. pixel-driving circuit according to claim 1, it is characterised in that two adjacent pixel units include：Adjacent
Red pixel cell and green pixel cell, or adjacent green pixel cell and blue pixel cells.
7. pixel-driving circuit according to claim 5, it is characterised in that in first pixel drive unit, the
One driving transistor, the second driving transistor, first switch transistor, the 3rd switching transistor and the 5th switching transistor are
P-type TFT, in second pixel drive unit, the 3rd driving transistor, the 4th driving transistor, second switch
Transistor, the 4th switching transistor and the 6th switching transistor are P-type TFT.
8. pixel-driving circuit according to claim 1, it is characterised in that in reset phase, the first drive signal end
Input signal is low level；In the first compensated stage, the input signal at the first scanning signal end is low level, and rank is compensated second
Section, the input signal at the second scanning signal end is low level；In glow phase, the input signal at the second drive signal end is low electricity
It is flat.
9. a kind of display base plate, it is characterised in that including any described pixel-driving circuits of claim 1-8.
10. a kind of image element driving method, for driving the pixel-driving circuit as described in claim 1-8, it is characterised in that bag
Include：
In reset phase, the first control unit is under the control at the first drive signal end and reset signal end, to first node
Current potential is reset, and the second control unit is under the control at the first drive signal end and reset signal end, to the electricity of Section Point
Position is reset；
In the first compensated stage, the first control unit is under the control of the first scanning signal end and data signal end, to first segment
The current potential of point is charged, until first threshold；In the first compensated stage, the data voltage saltus step of data signal end is the first electricity
Pressure；
In the second compensated stage, the second control unit is under the control of the second scanning signal end and data signal end, to second section
The current potential of point is charged, until Second Threshold；In the second compensated stage, the data voltage saltus step of data signal end is the second electricity
Pressure；
In glow phase, under the first driver element is controlled at the second scanning signal end, to the first light-emitting component output driving current,
Under second driver element is controlled at the second scanning signal end, to the second light-emitting component output driving current.
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Application publication date: 20171003 |