CN109979407A - A kind of GOA circuit, TFT substrate and display device - Google Patents
A kind of GOA circuit, TFT substrate and display device Download PDFInfo
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- CN109979407A CN109979407A CN201910322701.XA CN201910322701A CN109979407A CN 109979407 A CN109979407 A CN 109979407A CN 201910322701 A CN201910322701 A CN 201910322701A CN 109979407 A CN109979407 A CN 109979407A
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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
- G09G3/34—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
- G09G3/3674—Details of drivers for scan electrodes
- G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
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- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention discloses a kind of GOA circuit, TFT substrate and display devices, the GOA circuit includes multiple cascade GOA units, n-th grade of GOA unit includes: pull-up control module, for input direct-current high voltage, and when the n-th -4 grades grade communications number are in high potential, conducting voltage is adjusted, controls signal to export stable pull-up；N > 4；Pull-up module exports the same level scanning signal for controlling signal and clock signal according to the pull-up；Bootstrap module, for during the output of the same level scanning signal, pull-up control signal to be maintained high potential；Lower transmission module, for exporting the same level grade communication number according to the clock signal and low-potential signal；Pull-down module, for according to the same level scanning signal and the n-th+4 grades scanning signals, pull-up control signal to be pulled down to low potential；Maintenance module is pulled down, for pull-up control signal to be maintained low potential, to improve the stability of GOA circuit.
Description
Technical field
The present invention relates to technical field of display panel more particularly to a kind of GOA circuits, TFT substrate and display device.
Background technique
Gate Driver On Array, abbreviation GOA, that is, utilize existing thin-film transistor liquid crystal display array system
Gate line scanning drive signal circuit production in array substrate, is realized the driving method progressively scanned to grid by journey.
Grid chip is saved since GOA technology has, realizes the advantages such as narrow side, and GOA technology is widely used
In panel design, therefore GOA circuit is continued to optimize, keeps GOA performance more stable, it appears particularly necessary.But such as Fig. 1
Shown, the grid for pulling up thin film transistor (TFT) T11 in control module 11 accesses the n-th -4 grades scanning signal G (n-4), drain electrode access the
N-4 grades of grade communication ST (n-4), when G (n-4) is located at high potential, ST (n-4) also is located at high potential, at this time T11 be easy by
Current stress (stress) influences, so that the threshold voltage Vth shift of T11 is very big, to influence the stability of device, Jin Erying
Ring the stability of entire GOA circuit.
Summary of the invention
The embodiment of the present invention provides a kind of GOA circuit, TFT substrate and display device, unstable to solve existing GOA circuit
The problem of.
The embodiment of the invention provides a kind of GOA circuit, including multiple cascade GOA units, n-th grade of GOA unit includes:
Control module is pulled up, is used for input direct-current high voltage, and when the n-th -4 grades grade communications number are in high potential, adjustment
Conducting voltage controls signal to export stable pull-up；N > 4；
Pull-up module exports the same level scanning signal for controlling signal and clock signal according to the pull-up；
Bootstrap module, for during the output of the same level scanning signal, pull-up control signal to be maintained high potential；
Lower transmission module, for exporting the same level grade communication number according to the clock signal and low-potential signal；
Pull-down module, for according to the same level scanning signal and the n-th+4 grades scanning signals, pull-up control signal to be pulled down
To low potential；
Maintenance module is pulled down, for pull-up control signal to be maintained low potential.
Further, the pull-up control module includes first switch tube；
The pull-up control module is specifically used for input direct-current high voltage, and is in high potential in the n-th -4 grades grade communications number
When, the first switch tube is connected, control signal is pulled up with output, and signal adjustment described first is controlled according to the pull-up of output
The conducting voltage of switching tube controls signal to export stable pull-up.
Further, the pull-up control module further includes second switch and third switching tube；
The pull-up control module is specifically used for input direct-current high voltage, the second switch is connected, in the n-th -4 grades grades
When communication number is in high potential, the first switch tube is connected, controls signal to export the pull-up of high potential；It is controlled in the pull-up
When signal processed is located at high potential, the third switching tube is connected, to reduce the conducting voltage of the first switch tube, output is stablized
Pull-up control signal.
Further, the control terminal of the second switch receives the DC high voltage, the second switch it is defeated
Enter end and receive the n-th -4 grades grades communication number, the output end of the second switch connects the control terminal of the first switch tube；
The input terminal of the first switch tube receives the n-th -4 grades grades communication number, the output end of the first switch tube
Export the pull-up control signal；
The control terminal of the third switching tube receives the pull-up and controls signal, and the input terminal of the third switching tube receives
The output end of low-potential signal, the third switching tube connects the control terminal of the first switch tube.
Further, the first switch tube, the second switch and the third switching tube are thin film transistor (TFT)；
The control terminal is the grid of thin film transistor (TFT), and the input terminal is the source electrode of thin film transistor (TFT), and the output end is that film is brilliant
The drain electrode of body pipe.
Further, the second switch is identical with the size of the third switching tube.
Further, the DC high voltage is less than the high voltage of the clock signal.
Further, the bootstrap module includes bootstrap capacitor；
One end of the bootstrap capacitor connects the pull-up and controls signal, and the other end of the bootstrap capacitor receives the same level and sweeps
Retouch signal.
The embodiment of the invention also provides a kind of TFT substrates, including above-mentioned GOA circuit, and in this not go into detail.
The embodiment of the invention also provides a kind of display devices, including above-mentioned TFT substrate, and in this not go into detail.
The invention has the benefit that pull-up control module input direct-current high voltage, and be in the n-th -4 grades grade communications number
When high potential, output voltage is adjusted, reduce pull-up control module is influenced by current stress, improves the stabilization of pull-up control module
Property, to improve the stability of GOA circuit.
Detailed description of the invention
It, below will be to embodiment or the prior art in order to illustrate more clearly of embodiment or technical solution in the prior art
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is only some of invention
Embodiment for those of ordinary skill in the art without creative efforts, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is the structural schematic diagram of GOA circuit in the prior art；
Fig. 2 is the structural schematic diagram of GOA circuit provided in an embodiment of the present invention；
Fig. 3 is the signal timing diagram in GOA circuit provided in an embodiment of the present invention.
Specific embodiment
The explanation of following embodiment is referred to the additional illustration, the particular implementation that can be used to implement to illustrate the present invention
Example.The direction term that the present invention is previously mentioned, such as [on], [under], [preceding], [rear], [left side], [right side], [interior], [outer], [side]
Deng being only the direction with reference to annexed drawings.Therefore, the direction term used be to illustrate and understand the present invention, rather than to
The limitation present invention.The similar unit of structure is with being given the same reference numerals in the figure.
It referring to fig. 2, is the structural schematic diagram of GOA circuit provided in an embodiment of the present invention.
GOA circuit provided in an embodiment of the present invention includes multiple cascade GOA units, and n-th grade of GOA unit includes pull-up control
Molding block 21, pull-up module 22, bootstrap module 23, lower transmission module 24, pull-down module 25 and drop-down maintenance module 26.Wherein, n >
4。
It pulls up control module 21 and is used for input direct-current high voltage VGH1, and be in height in the n-th -4 grades grade communication ST (n-4)
When current potential, conducting voltage is adjusted, controls signal Qn to export stable pull-up.
It should be noted that DC high voltage VGH1 is a DC signal being independently accessed.Control module 21 is pulled up to be connected
After can export pull-up control signal Qn, pull-up control signal Qn can be used for controlling the opening and closing of pull-up module 22.
Pull-up module 22 with pull-up control module 21 output end connect, for according to the pull-up control signal Qn and when
Clock signal CKn exports the same level scanning signal Gn.
It should be noted that the pull-up control signal Qn that pull-up control module 21 exports is input to pull-up module 22, simultaneously
22 input clock signal CKn of pull-up module keeps pull-up module 22 according to pull-up control signal Qn that the clock signal CKn of input is defeated
It is out the same level scanning signal Gn.
Bootstrap module 23 is connect with the output end of the pull-up control module 21, for exporting the phase in the same level scanning signal Gn
Between, pull-up control signal Qn is maintained into high potential.
Further, the bootstrap module 23 includes bootstrap capacitor Cb；
One end of the bootstrap capacitor Cb connects the pull-up and controls signal Qn, and the other end of the bootstrap capacitor Cb receives
The same level scanning signal Gn.
Lower transmission module 24 is used to export the same level grade communication STn according to the clock signal CKn and low-potential signal VSS.
It should be noted that lower 24 input clock signal CKn of transmission module, and according to low-potential signal VSS, believed using clock
Number CKn output stage communication STn.
Pull-down module 25 is connect with the output end of the output end of pull-up control module 21, pull-up module 22 respectively, is used for root
According to the same level scanning signal Gn and the n-th+4 grades scanning signal G (n+4), pull-up control signal Qn is pulled down to low potential VSS.
Drop-down maintenance module 26 is connect with the control terminal of pull-down module 25, pull-up control module 21 respectively, and being used for will be described
Pull-up control signal Qn maintains low potential.
It should be noted that drop-down maintenance module 26 access pull-up control signal Qn, output signal Pn, and signal Pn is passed
Transport to pull-down module 25.When pull-up control signal Qn is low potential, signal Pn is high potential, and the TFT in pull-down module 25 is led
It is logical, it pulls down and maintains pull-up control signal Qn in low potential.
Further, as shown in Fig. 2, the pull-up control module 21 includes first switch tube T11-b；
The pull-up control module 21 is specifically used for input direct-current high voltage VGH1, and in the n-th -4 grades grade communication ST (n-
4) when being in high potential, the first switch tube T11-b is connected, control signal Qn is pulled up with output, and according to the pull-up of output
Control signal Qn adjusts the conducting voltage of the first switch tube T11-b, controls signal Qn to export stable pull-up.
It should be noted that the conducting of pull-up control module 21 specifically refers to the conducting of first switch tube T11-b, first is opened
Output pull-up controls signal Qn after closing pipe T11-b conducting, and the current potential of the pull-up control signal Qn exported at this time is excessively high, electrically unstable
It is fixed, therefore the voltage of the control terminal input of first switch tube T11-b is adjusted, and then adjust the upper of first switch tube T11-b output
The voltage for drawing control signal Qn is in pull-up control signal Qn and stablizes high potential.
Further, as shown in Fig. 2, the pull-up control module 21 further includes second switch T11-a and third switch
Pipe T11-c；
The pull-up control module 21 is specifically used for input direct-current high voltage VGH1, and the second switch T11-a is connected,
When the n-th -4 grades grade communication ST (n-4) are in high potential, the first switch tube T11-b is connected, to export the upper of high potential
Draw control signal Qn；When pull-up control signal Qn is located at high potential, the third switch transistor T 11-c is connected, to reduce
The conducting voltage of the first switch tube T11-b exports stable pull-up control signal Qn.
It should be noted that as shown in connection with fig. 3, DC high voltage VGH1 is high potential, the DC high voltage VGH1 of input
So that second switch T11-a is connected, and when the n-th -4 grades grade communication ST (n-4) of input are located at high potential, the n-th -4 grades grades
The high potential of communication ST (n-4) passes to first switch tube T11-b by second switch T11-a, so that first switch tube
T11-b conducting, and then pull up the pull-up control signal Qn that control module 21 exports high potential.When pull-up control signal Qn is high electricity
When position, third switch transistor T 11-c conducting feeds back to first switch tube T11-b.As second switch T11-a and third switching tube
It when T11-c is connected, is matched by voltage, the conducting voltage for being input to first switch tube T11-b reduces but still is able to conducting the
One switch transistor T 11-b exports stable pull-up control signal to make first switch tube T11-b by lesser current stress
Qn。
Specifically, as shown in Fig. 2, the control terminal of the second switch T11-a receives the DC high voltage VGH1, institute
The input terminal for stating second switch T11-a receives the n-th -4 grades grades communication ST (n-4), the second switch T11-a's
Output end connects the control terminal of the first switch tube T11-b；
The input terminal of the first switch tube T11-b receives the n-th -4 grades grades communication ST (n-4), and described first opens
The output end for closing pipe T11-b exports the pull-up and controls signal Qn；
The control terminal of the third switch transistor T 11-c receives the pull-up and controls signal Qn, the third switch transistor T 11-c
Input terminal receive low-potential signal VSS, the output end of the third switch transistor T 11-c connects the first switch tube T11-b
Control terminal.
Further, the first switch tube T11-b, the second switch T11-a and the third switch transistor T 11-c
It is thin film transistor (TFT) TFT；The control terminal is the grid of thin film transistor (TFT) TFT, and the input terminal is thin film transistor (TFT) TFT's
Source electrode, the output end are the drain electrode of thin film transistor (TFT) TFT.
In a specific embodiment, the size of the second switch T11-a and the third switch transistor T 11-c
Identical, the DC high voltage VGH1 is less than the high voltage VGH of the clock signal CKn.
It should be noted that the grid access DC high voltage VGH1 of second switch T11-a, and DC high voltage VGH1
It is the voltage lower than VGH, is fully able to so that second switch T11-a is connected but is unlikely to so that second switch T11-
The Vth shift amount that a is caused TFT big by big current stress.When second switch T11-a and third switch transistor T 11-c are equal
When conducting, since second switch T11-a is identical with the size of third switch transistor T 11-c, i.e. second switch T11-a and third
The ON resistance of switch transistor T 11-c is identical, according to resistive voltage voltage divider principle, second switch T11-a and third switching tube
T11-c point voltage it is essentially identical so that the voltage that the grid of first switch tube T11-b accesses be adjusted to (VGH1-VSS)/
2, and (VGH1-VSS)/2 is less than VGH1, it is farther to be less than VGH, so that first switch tube T11-b is answered by lesser electric current
Power improves the stability of pull-up control module 21.
In another particular embodiment of the invention, the first switch tube T11-b, the second switch T11-a and institute
The size for stating third switch transistor T 11-c is respectively less than the size of thin film transistor (TFT) T11 in Fig. 1, and the DC high voltage VGH1 is less than
Or the high voltage VGH equal to the clock signal CKn.
It should be noted that the size due to three switching tubes is less than the size of thin film transistor (TFT) T11 in Fig. 1, even if the
The voltage of the control terminal input of two switch transistor T 11-a is identical as VGH, and the current stress that three switching tubes are subject to also can be relatively
It is small.Therefore, the present embodiment not only make pull up control module 21 complete its script work, moreover it is possible to so that TFT therein by
Lesser current stress improves the stability of TFT, and then improve entire GOA circuit to effectively reduce the Vth shift of TFT
Stability.
It can be seen from the above, GOA circuit provided in this embodiment, control module input direct-current high voltage is pulled up, and the
When n-4 grades of grade communications number are in high potential, output voltage is adjusted, reduce pull-up control module is influenced by current stress, is improved
The stability for pulling up control module, to improve the stability of GOA circuit.
The present embodiment also provides a kind of TFT substrate, and including the GOA circuit in above-described embodiment, in this not go into detail.
TFT substrate provided in this embodiment, reduce pull-up control module is influenced by current stress, improves pull-up control mould
The stability of block, to improve the stability of GOA circuit.
The present embodiment also provides a kind of display device, no longer superfluous in detail herein including the TFT substrate in above-described embodiment
It states.
Display device provided in this embodiment, reduce pull-up control module is influenced by current stress, improves pull-up control
The stability of module, to improve the stability of GOA circuit.
In conclusion although the present invention has been disclosed above in the preferred embodiment, but above preferred embodiment is not to limit
The system present invention, those skilled in the art can make various changes and profit without departing from the spirit and scope of the present invention
Decorations, therefore protection scope of the present invention subjects to the scope of the claims.
Claims (10)
1. a kind of GOA circuit, which is characterized in that including multiple cascade GOA units, n-th grade of GOA unit includes:
Control module is pulled up, is used for input direct-current high voltage, and when the n-th -4 grades grade communications number are in high potential, adjustment conducting
Voltage controls signal to export stable pull-up；N > 4；
Pull-up module exports the same level scanning signal for controlling signal and clock signal according to the pull-up；
Bootstrap module, for during the output of the same level scanning signal, pull-up control signal to be maintained high potential；
Lower transmission module, for exporting the same level grade communication number according to the clock signal and low-potential signal；
Pull-down module, for pull-up control signal being pulled down to low according to the same level scanning signal and the n-th+4 grades scanning signals
Current potential；
Maintenance module is pulled down, for pull-up control signal to be maintained low potential.
2. GOA circuit according to claim 1, which is characterized in that the pull-up control module includes first switch tube；
The pull-up control module is specifically used for input direct-current high voltage, and when the n-th -4 grades grade communications number are in high potential, leads
Lead to the first switch tube, control signal is pulled up with output, and signal is controlled according to the pull-up of output and adjusts the first switch
The conducting voltage of pipe controls signal to export stable pull-up.
3. GOA circuit according to claim 2, which is characterized in that the pull-up control module further includes second switch
With third switching tube；
The pull-up control module is specifically used for input direct-current high voltage, the second switch is connected, in the n-th -4 grades grade communications
Number be in high potential when, the first switch tube is connected, with export high potential pull-up control signal；It controls and believes in the pull-up
When number being located at high potential, the third switching tube is connected, to reduce the conducting voltage of the first switch tube, exports stable upper
Draw control signal.
4. GOA circuit according to claim 3, which is characterized in that the control terminal of the second switch receives described straight
High voltage is flowed, the input terminal of the second switch receives the n-th -4 grades grades communication number, the output end of the second switch
Connect the control terminal of the first switch tube；
The input terminal of the first switch tube receives the n-th -4 grades grades communication number, the output end output of the first switch tube
The pull-up controls signal；
The control terminal of the third switching tube receives the pull-up and controls signal, and the input terminal of the third switching tube receives low electricity
Position signal, the output end of the third switching tube connect the control terminal of the first switch tube.
5. GOA circuit according to claim 4, which is characterized in that the first switch tube, the second switch and institute
Stating third switching tube is thin film transistor (TFT)；The control terminal is the grid of thin film transistor (TFT), and the input terminal is film crystal
The source electrode of pipe, the output end are the drain electrode of thin film transistor (TFT).
6. GOA circuit according to claim 3, which is characterized in that the second switch and the third switching tube
Size is identical.
7. GOA circuit according to claim 1, which is characterized in that the DC high voltage is less than the clock signal
High voltage.
8. GOA circuit according to claim 1, which is characterized in that the bootstrap module includes bootstrap capacitor；
One end of the bootstrap capacitor connects the pull-up and controls signal, and the other end of the bootstrap capacitor receives the same level scanning letter
Number.
9. a kind of TFT substrate, which is characterized in that including GOA circuit as claimed in any one of claims 1 to 8.
10. a kind of display device, which is characterized in that including TFT substrate as claimed in claim 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910322701.XA CN109979407B (en) | 2019-04-22 | 2019-04-22 | GOA circuit, TFT substrate and display device |
| PCT/CN2019/104372 WO2020215582A1 (en) | 2019-04-22 | 2019-09-04 | Goa circuit, tft substrate and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910322701.XA CN109979407B (en) | 2019-04-22 | 2019-04-22 | GOA circuit, TFT substrate and display device |
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| CN109979407A true CN109979407A (en) | 2019-07-05 |
| CN109979407B CN109979407B (en) | 2020-06-16 |
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| CN201910322701.XA Active CN109979407B (en) | 2019-04-22 | 2019-04-22 | GOA circuit, TFT substrate and display device |
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| CN (1) | CN109979407B (en) |
| WO (1) | WO2020215582A1 (en) |
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| WO2020215582A1 (en) * | 2019-04-22 | 2020-10-29 | 深圳市华星光电半导体显示技术有限公司 | Goa circuit, tft substrate and display device |
| WO2021012313A1 (en) * | 2019-07-22 | 2021-01-28 | 深圳市华星光电半导体显示技术有限公司 | Gate driving circuit |
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| WO2020215582A1 (en) * | 2019-04-22 | 2020-10-29 | 深圳市华星光电半导体显示技术有限公司 | Goa circuit, tft substrate and display device |
| WO2021012313A1 (en) * | 2019-07-22 | 2021-01-28 | 深圳市华星光电半导体显示技术有限公司 | Gate driving circuit |
| CN111243541A (en) * | 2020-02-26 | 2020-06-05 | 深圳市华星光电半导体显示技术有限公司 | GOA circuit and TFT substrate |
| CN111243541B (en) * | 2020-02-26 | 2021-09-03 | 深圳市华星光电半导体显示技术有限公司 | GOA circuit and TFT substrate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109979407B (en) | 2020-06-16 |
| WO2020215582A1 (en) | 2020-10-29 |
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