CN110349534A - Pixel circuit and its driving method - Google Patents
Pixel circuit and its driving method Download PDFInfo
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- CN110349534A CN110349534A CN201910751142.4A CN201910751142A CN110349534A CN 110349534 A CN110349534 A CN 110349534A CN 201910751142 A CN201910751142 A CN 201910751142A CN 110349534 A CN110349534 A CN 110349534A
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- 238000000034 method Methods 0.000 title claims description 15
- 230000008878 coupling Effects 0.000 claims description 11
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 8
- 102100023478 Transcription cofactor vestigial-like protein 1 Human genes 0.000 description 6
- 101710176146 Transcription cofactor vestigial-like protein 1 Proteins 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 5
- 108010076504 Protein Sorting Signals Proteins 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 229920001621 AMOLED Polymers 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 229910052733 gallium Inorganic materials 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- 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]
-
- 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
-
- 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
-
- 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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
Abstract
A kind of pixel circuit includes the first transistor, second transistor, third transistor and driving transistor.The first end of the first transistor receives system high voltage.The second end of the first transistor couples first node.The first transistor according to control signal-selectivity to be connected.The first end of second transistor couples first node.The second end of second transistor receives system low-voltage.The control terminal of second transistor is to receive data-signal.The first end of third transistor couples first node.The second end of third transistor couples second node.Third transistor according to control signal-selectivity to be connected.Drive transistor couples second node and light-emitting component.Drive transistor to according to the voltage potential output driving current of second node to light-emitting component.
Description
Technical field
The present invention relates to a kind of pixel circuits, and in particular to a kind of pixel circuit with compensation function.
Background technique
As the demand of numeric display unit increasingly increases, indium gallium zinc (Indium Gallium Zinc Oxide,
IGZO) be widely used in active liquid crystal display (Active Matrix Liquid Crystal Displays, AMLCD),
Active organic light-emitting diode display device (Active Matrix Organic Light Emitting Display,
) etc. AMOLED in.
In order to make self-emitting display keep uniform brightness, the driving current in pixel must remain constant.However
In IGZO processing procedure, between driving the variation of the critical voltage (threshold voltage, Vth) of transistor to will cause different pixels
The variation of brightness.
Summary of the invention
One embodiment of the present invention is about a kind of pixel circuit.Pixel circuit includes the first transistor, the second crystal
Pipe, third transistor and driving transistor.The first end of the first transistor receives system high voltage.The second end of the first transistor
Couple first node.The first transistor according to control signal-selectivity to be connected.The first end coupling the of second transistor
One node.The second end of second transistor receives system low-voltage.The control terminal of second transistor is to receive data-signal.The
The first end of three transistors couples first node.The second end of third transistor couples second node.Third transistor is to root
It is connected according to control signal-selectivity.Drive transistor couples second node and light-emitting component.Drive transistor to according to section
The voltage potential output driving current of point is to light-emitting component.
It includes the first transistor, second transistor, third that one embodiment of the present invention, which is about another pixel circuit,
Transistor and driving transistor.The first end of the first transistor receives system high voltage.The second end coupling the of the first transistor
One node.The first transistor according to first control signal to selectively turn on.The first end coupling first of second transistor
Node.The second end of second transistor receives system low-voltage.The control terminal of second transistor is to receive data-signal.Third
The first end of transistor couples first node.The second end of third transistor couples second node.Third transistor is to basis
Second control signal selectively turns on.Drive transistor couples second node and light-emitting component.Drive transistor to basis
The voltage potential output driving current of node is to light-emitting component.
One embodiment of the present invention is
Transistor is respectively according to control signal and data signal conduction to provide voltage potential；It is led by third transistor according to control signal
Pass to output voltage current potential；By driving transistor according to voltage potential output driving current to light-emitting component；And by the member that shines
Part carries out luminous according to driving current.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Detailed description of the invention
Fig. 1 is the schematic diagram that a kind of pixel circuit is shown according to section Example of the present invention.
Fig. 2 is the signal sequence schematic diagram that a kind of pixel circuit is shown according to section Example of the present invention.
Fig. 3 is to exemplify the schematic diagram of another pixel circuit according to other parts of the present invention implementation.
Fig. 4 is to exemplify the signal sequence schematic diagram of another pixel circuit according to other parts of the present invention implementation.
Fig. 5 is the flow chart that a kind of pixel circuit drive method is shown according to section Example of the present invention.
Wherein, appended drawing reference:
100,300: pixel circuit
T1, T2, T3, Td: transistor
C1: capacitor
LED: light-emitting component
N1, N2: node
S1, S2: control signal
Data: data-signal
Id: driving current
OVDD: system high voltage
OVSS: system low-voltage
Vs1, Vs2: enable voltage potential
Vgl1, Vgh2, Vdl: forbidden energy voltage potential
Vdata: data voltage current potential
T1, T2, Tf: period
500: pixel circuit drive method
S520, S540, S560, S580: operation
Specific embodiment
Structural principle and working principle of the invention are described in detail with reference to the accompanying drawing:
Hereafter appended attached drawing is cooperated to elaborate for embodiment, but described specific embodiment is only to explain this
Case is not used to limit this case, and the description of structure operation is non-to limit its sequence executed, any to be reconfigured by element
Structure, the produced device having and other effects, is all the range that is covered of the present invention.
The word (terms) used in full piece specification and claims usually has every in addition to having and especially indicating
A word using in the content disclosed in this area, herein with the usual meaning in special content.About used herein
" first ", " second ", " third " ... etc., not especially censure the meaning of order or cis-position, it is also non-to limit this announcement,
Its element described with same technique term just for the sake of difference or operation.
Please refer to Fig. 1.Fig. 1 is the schematic diagram that a kind of pixel circuit 100 is shown according to section Example of the present invention.In part
In embodiment, pixel circuit 100 can be used for active liquid crystal display (Active Matrix Liquid Crystal
Displays, AMLCD), positive type organic light emitting diode display (Active Matrix Organic Light
Emitting Display, AMOLED), the light emitting diode indicator that actively declines (Active Matrix Micro Light
Emitting Display, AMOLED, AM μ LED) etc..It may include multiple pixel circuits as shown in Figure 1 in display device
100 to form complete display picture.
As shown in Figure 1, in some embodiments, pixel circuit 100 includes transistor T1, transistor T2, transistor T3, drives
Dynamic transistor Td, capacitor C1 and light-emitting component LED.In the present embodiment, as shown in Figure 1, transistor T1, T2, T3 and driving are brilliant
Body pipe Td is all N-type TFT.Wherein, it is transistor gate that the size W/L ratio of transistor T1 and transistor T2, which is 1: 4, W,
Pole width, L are transistor gate length.In some embodiments, light-emitting component LED can be light emitting diode.
In structure, the first end coupling system high voltage OVDD of transistor T1.The control terminal of transistor T1 couples scan line.
The second end couple nodes N1 of transistor T1.The first end couple nodes N1 of transistor T2.The control terminal of transistor T2 couples number
According to line.The second end coupling system low-voltage OVSS of transistor T2.The first end couple nodes N1 of transistor T3.Transistor T3's
Control terminal couples scan line.The second end couple nodes N2 of transistor T3.
Drive the first end coupling system high voltage OVDD of transistor Td.Drive the control terminal couple nodes of transistor Td
N2.Drive the second end coupling system low-voltage OVSS of transistor Td.The first end couple nodes N2 of capacitor C1.The of capacitor C1
The second end of two ends coupling driving transistor Td.Light-emitting component LED is coupled to the first end and the high electricity of system of driving transistor Td
It presses between OVDD.In other parts embodiment, light-emitting component LED can be coupled to driving transistor Td and system low-voltage OVSS
Between.
In operation, transistor T1 is selectively turned on to the control signal S1 transmitted according to self-scanning line.Transistor T2
To be selectively turned on according to the data-signal Data transmitted from data line.In other words, transistor T1 and transistor T2 to
According to control signal S1 and data-signal Data conducting to provide voltage potential to node N1.
Transistor T3 is selectively turned on to the control signal S1 transmitted according to self-scanning line with the electricity of receiving node N1
Piezoelectric position is exported to node N2.Drive transistor Td to be selectively turned on according to the voltage potential of node N2 with output driving
Electric current Id to light-emitting component LED.Light-emitting component LED is luminous to be carried out according to driving current Id.
For ease of illustration for the sake of, the concrete operations of each element will arrange in pairs or groups attached in following paragraphs in pixel circuit 100
Figure is illustrated.Please also refer to Fig. 1 and Fig. 2.Fig. 2 is that a kind of pixel circuit 100 is shown according to section Example of the present invention
Signal sequence schematic diagram.As shown in Fig. 2, period Tf is the time of a frame (frame).Period Tf includes first period T1 and second
Period T2.
In some embodiments, first period T1 corresponds to write-in and the compensated stage of pixel circuit 100.In first period
T1, control signal S1 are enable voltage potential Vs1.As shown in Fig. 2, control signal S1 is high voltage potential.And in first period
T1, data-signal Data are data voltage current potential Vdata.For example, first period T1 can be 2 microseconds.
Second phase T2 corresponds to the light emitting phase of pixel circuit 100.In second phase T2, controlling signal S1 is forbidden energy electricity
Piezoelectric position Vgl1.As shown in Fig. 2, control signal S1 is low voltage potential.It and is forbidden energy in second phase T2, data-signal Data
Voltage potential Vdl.As shown in Fig. 2, data-signal Data can be low voltage potential.In some embodiments, control signal S1 and
Forbidden energy voltage potential Vgl1, Vdl of data-signal Data can be identical or different voltage potential.In other parts embodiment
In, it can be floating voltage current potential in second phase T2, data-signal Data.
Specifically, the control signal S1 positioned at enable voltage potential Vs1 leads transistor T1 in first period T1
It is logical.Positioned at the data-signal Data of data voltage current potential Vdata transistor T2 is connected.Due to transistor T1 and transistor T2
Electric current it is equal, as shown in following formula (1):
4k(Vdata-Vth2)2=k (Vs1-Vn1-Vth1)2 (1)
Wherein, Vth1 is the critical voltage of transistor T1.Vth2 is the critical voltage of transistor T2.Vn1 is to be provided to section
The voltage potential of point N1.
Therefore, it is provided to shown in the voltage potential such as following formula (2) of node N1 according to formula (1), transistor T1 and transistor T2:
Vn1=Vs1-2Vdata+2Vth2-Vth1 (2)
In addition, transistor T3 is connected positioned at the control signal S1 of enable voltage potential Vs1 in first period T1,
The voltage potential of node N1 is provided to node N2.Specifically, shown in the voltage potential of node N2 such as formula (3).
Vn2=Vn1=Vs1-2Vdata+2Vth2-Vth1 (3)
Wherein, Vn2 is the voltage potential for being provided to node N2.
In this way, according to formula (3) and due to closely located, the crystal of transistor T1, T2, T3 and driving transistor Td
The critical voltage of pipe T1, T2, T3 and driving transistor Td are rough equal.Therefore, in second phase T2, drive transistor Td according to
Formula (4) output driving current Id.
Id=k (Vgs-Vthd)2
=k (Vs1-2Vdata+2Vth2-Vth1-Vthd)2
=k (Vs1-2Vdata)2 (4)
Wherein, Vgs is the pressure difference for driving the gate terminal and source terminal of transistor Td.Vthd is the critical of driving transistor Td
Voltage.Due to closely located, critical voltage Vth1, the transistor of transistor T1 of transistor T1, T2, T3 and driving transistor Td
The critical voltage Vthd of the critical voltage Vth2 and driving transistor Td of T2 are rough equal.Therefore, 2Vth2-Vth1-Vthd can phase
Disappear is zero.In other words, the influence that the critical voltage Vthd of driving transistor Td may cause driving current Id due to variation can
Therefore it is eliminated.
In addition, closing transistor T1 and T3 positioned at the control signal S1 of forbidden energy voltage potential Vgl1 in second phase T2
It is disconnected.Positioned at the data-signal Data of forbidden energy voltage potential Vdl transistor T2 is turned off.In other parts embodiment, it is located at
The data-signal Data of floating voltage current potential makes transistor T2 not necessarily on or off.
Please refer to Fig. 3.Fig. 3 is to exemplify the schematic diagram of another pixel circuit 300 according to other parts of the present invention implementation.
It in embodiment illustrated in fig. 3, is indicated, is operated in elder generation with identical component symbol with similar element in the embodiment of Fig. 1
Previous paragraphs expositor, repeats no more in this.It is compared with embodiment illustrated in fig. 1, as shown in figure 3, transistor T3 in pixel circuit 300
To receive control signal S2.Wherein, transistor T1, T2 and driving transistor Td is N-type TFT, and transistor T3 is P
Type thin film transistor (TFT).
For ease of illustration for the sake of, the concrete operations of each element will arrange in pairs or groups attached in following paragraphs in pixel circuit 300
Figure is illustrated.Please also refer to Fig. 3 and Fig. 4.Fig. 4 is that a kind of pixel circuit 300 is shown according to section Example of the present invention
Signal sequence schematic diagram.In embodiment illustrated in fig. 4, with similar element in the embodiment of Fig. 2 with identical component symbol table
Show, operates in previous paragraph expositor, repeated no more in this.It compares with embodiment illustrated in fig. 2, is more shown out in Fig. 4
Control signal S2.
In some embodiments, in first period T1, controlling signal S1, S2 is respectively enable voltage potential Vs1, Vs2.Such as
Shown in Fig. 4, control signal S1 is high voltage potential, and control signal S2 is low voltage potential.In second phase T2, signal is controlled
S1, S2 are respectively forbidden energy voltage potential Vgl1, Vgh2.As shown in figure 4, control signal S1 is low voltage potential, signal S2 is controlled
For high voltage potential.
In some embodiments, enable voltage potential Vs1 and forbidden energy voltage potential Vgh2 can be identical voltage potential.Prohibit
Energy voltage potential Vgl1 and enable voltage potential Vs2 can be identical voltage potential.In other words, control signal S1 and S2 can be each other
Reversed signal.
Please refer to Fig. 5.Fig. 5 is the process that a kind of pixel circuit drive method 500 is shown according to section Example of the present invention
Figure.As shown in figure 5, pixel circuit drive method 500 includes operation S520, S540, S560 and S580.
Firstly, in operation S520, by transistor T1 and transistor T2 respectively according to control signal S1 and data-signal
Data is connected to provide voltage potential.Specifically, be connected by transistor T1 according to control signal S1 in first period T1, by
Transistor T2 is connected according to data-signal Data.Voltage potential is provided according to the electric current for flowing through transistor T1 and transistor T2 jointly
To node N1.At this time shown in the voltage potential of node N1 such as above formula (2).
Then, in operation S540, by transistor T3 according to control signal S1 or S2 conducting with output voltage current potential.Specifically
For, in first period T1, be connected by the thin film transistor (TFT) T3 of N-type according to control signal S1 with the voltage potential of node N1 is defeated
Out to node N2.Alternatively, by the thin film transistor (TFT) T3 of p-type according to control signal S2 conducting to export the voltage potential of node N1
To node N2.At this time shown in the voltage potential of node N2 such as above formula (3).
Then, in operation S560, by driving transistor Td according to voltage potential output driving current Id to light-emitting component
LED.Specifically, driving transistor Td voltage potential output driving current Id according to shown in formula (3) is extremely in second phase T2
Light-emitting component LED.Shown in driving current Id such as formula (4).
Then, it in operation S580, is carried out by light-emitting component LED according to driving current Id luminous.
Although disclosed method is shown and described as a series of step or event herein, but it is to be understood that institute
The sequence of these steps or event for showing should not be construed as limited significance.For example, part steps can be occurred with different order
And/or with other than illustrated herein and/or described step or event other steps or event occur simultaneously.In addition,
When implementing one or more embodiments or embodiment described herein, and not all is all required the step of this shows.
In addition, one or more steps herein may also execute the step of one or more separates and/or in the stage.
In conclusion this case penetrates in the above-mentioned each embodiment of application, by the dimension scale and data of transistor T1, T2
The design of signal Data is to compensate, and when so that display panel being shown, the size of current of driving current Id will not be driven
It moves the element characteristic (such as critical voltage is different) of transistor Td and influences, it is possible to provide metastable driving current Id.In addition, by
By being completed at the same time data write-in and transistor threshold voltage compensation within a stage, it can significantly shorten compensation critical voltage and extremely send out
The optical element LED luminous time, and compensation effect is good.Furthermore a scanning line traffic control is only needed in this case section Example
Signal S1, therefore can reduce the complexity of control circuit, and thus reduce the cost of display system.And the pixel circuit of this case
100,300 area to can be reduced transistor array for pixel circuit of the 4T1C framework compared to 4T2C or more.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding changes and modifications, but these corresponding changes and change in accordance with the present invention
Shape all should fall within the scope of protection of the appended claims of the present invention.
Claims (10)
1. a kind of pixel circuit, characterized by comprising:
One the first transistor, a first end one system high voltage of reception of the first transistor, the one second of the first transistor
One first node of end coupling, the first transistor according to a control signal-selectivity to be connected；
One second transistor, a first end of the second transistor couple the first node, a second end of the second transistor
A system low-voltage is received, a control terminal of the second transistor is to receive a data-signal；
One third transistor, a first end of the third transistor couple the first node, a second end of the third transistor
A second node is coupled, the third transistor according to the control signal-selectivity to be connected；And
One driving transistor, the driving transistor couples second node and a light-emitting component, the driving transistor is to basis
The voltage potential of the second node exports a driving current to the light-emitting component.
2. pixel circuit as described in claim 1, which is characterized in that further include:
One capacitor, a first end of the capacitor couple the second node, and a second end of the capacitor couples the driving transistor
Second end.
3. pixel circuit as described in claim 1, which is characterized in that wherein in a first period, the first transistor and should
Third transistor is to according to the control signal conduction, and the second transistor is to receive the data-signal, in a second phase,
For the first transistor to be turned off according to the control signal, the light-emitting component is luminous to be carried out according to the driving current.
4. pixel circuit as described in claim 1, which is characterized in that wherein the first transistor and the one of the second transistor
Dimension scale is one to four.
5. pixel circuit as claimed in claim 4, which is characterized in that wherein the first transistor, the second transistor, this
Three transistors and the driving transistor are N-type TFT.
6. a kind of pixel circuit, characterized by comprising:
One the first transistor, a first end one system high voltage of reception of the first transistor, the one second of the first transistor
One first node of end coupling, the first transistor according to a first control signal to selectively turn on；
One second transistor, a first end of the second transistor couple the first node, a second end of the second transistor
A system low-voltage is received, a control terminal of the second transistor is to receive a data-signal；
One third transistor, a first end of the third transistor couple the first node, the second end coupling of the third transistor
A second node is connect, the third transistor according to a second control signal to selectively turn on；And
One driving transistor, the driving transistor couples second node and a light-emitting component, the driving transistor is to basis
The voltage potential of the node exports a driving current to the light-emitting component.
7. a kind of pixel circuit drive method, characterized by comprising:
By a first transistor and a second transistor respectively according to a control signal and data-signal conducting to provide an electricity
Piezoelectric position；
By a third transistor according to the control signal conduction to export the voltage potential；
One driving current a to light-emitting component is exported according to the voltage potential by a driving transistor；And
It is carried out by a light-emitting component according to the driving current luminous.
8. pixel circuit drive method as claimed in claim 7, which is characterized in that further include:
In a first period, led respectively according to the control signal and the data-signal by the first transistor and the second transistor
Pass to provide the voltage potential, and by the third transistor according to the control signal conduction to export the voltage potential；And
In a second phase, turned off by the first transistor and the third transistor according to the control signal, by the driving crystal
Pipe exports the driving current to the light-emitting component according to the voltage potential, and is sent out by the light-emitting component according to the driving current
Light.
9. pixel circuit drive method as claimed in claim 7, which is characterized in that the wherein the first transistor and second crystalline substance
One dimension scale of body pipe is one to four.
10. pixel circuit drive method as claimed in claim 7, which is characterized in that the wherein the first transistor, second crystalline substance
Body pipe, the third transistor and the driving transistor are N-type TFT.
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| TW108100750 | 2019-01-08 | ||
| TW108100750A TWI685831B (en) | 2019-01-08 | 2019-01-08 | Pixel circuit and driving method thereof |
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| CN110349534A true CN110349534A (en) | 2019-10-18 |
| CN110349534B CN110349534B (en) | 2020-12-01 |
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Also Published As
| Publication number | Publication date |
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| TWI685831B (en) | 2020-02-21 |
| CN110349534B (en) | 2020-12-01 |
| TW202027056A (en) | 2020-07-16 |
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