CN106652936B - GOA circuit and display device - Google Patents
GOA circuit and display device Download PDFInfo
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- CN106652936B CN106652936B CN201611130826.5A CN201611130826A CN106652936B CN 106652936 B CN106652936 B CN 106652936B CN 201611130826 A CN201611130826 A CN 201611130826A CN 106652936 B CN106652936 B CN 106652936B
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- 239000004973 liquid crystal related substance Substances 0.000 description 3
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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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Abstract
The present invention provides a kind of GOA circuit and display device, the GOA circuit includes cascade GOA unit, each GOA unit includes pull-up control unit, pull-up unit, drop-down unit and drop-down maintenance unit, and each drop-down maintenance unit includes drop-down maintenance module, the first pull-down module and the second pull-down module.Every two adjacent GOA unit constitutes one group, the drop-down maintenance module of higher level's GOA unit therein controls the second pull-down module of the first pull-down module and junior's GOA unit in higher level's GOA unit so that the current potential of the grid signal of higher level's GOA unit and junior's GOA unit point and horizontal time-base is maintained low potential, and the drop-down maintenance module of junior's GOA unit controls the second pull-down module of the first pull-down module and higher level's GOA unit in junior's GOA unit so that the current potential of the grid signal of junior's GOA unit and higher level's GOA unit point and horizontal time-base is maintained low potential.The present invention can save the occupied space of GOA circuit, be conducive to the realization of narrow frame display panel.
Description
Technical field
The present invention relates to a kind of GOA circuit for FPD and use the display device of the GOA circuit.
Background technique
The advantages that liquid crystal display is high, cheap, easy to carry with its display quality, become mobile communication equipment, PC,
The display device of TV etc..The panel driving technology of the TV liquid crystal display generallyd use at present is gradually intended to using GOA technology,
GOA technology can simplify the production process of panel display board, save engagement (bonding) technique in horizontal scanning line direction, can
It promotes production capacity, reduce product cost, while the integrated level that can promote display panel is allowed to be more suitable for making narrow frame or boundless
Frame shows product, and the vision for meeting modern people is pursued.
GOA technology, i.e. Gate Driver on Array technology, that is, utilize existing Thin Film Transistor-LCD
Gate row scanning drive signal circuit production on Array substrate, is realized the driving side progressively scanned to Gate by Array processing procedure
Formula.The main frame of GOA circuit has pull-up unit (Pull-up part), pull-up control unit (Pull-up control
Part), drop-down unit (Pull-down Part) and drop-down maintenance unit (Pull-down Holding Part) and be responsible for
The Boost capacitor of current potential lifting.
Fig. 1 is the circuit diagram of existing GOA unit.
Referring to Fig.1, existing GOA circuit includes cascade multiple GOA units.N-th grade of GOA unit includes pull-up control
Unit 110, pull-up unit 120, drop-down unit 130, first pull down maintenance unit 140 and the second drop-down maintenance unit 150.It can be with
Find out, every grade of GOA unit includes two drop-down maintenance units, and the first clock signal LC1 and second clock signal LC2 are alternately defeated
Enter to the first drop-down maintenance unit 140 and the second drop-down maintenance unit 150.First drop-down maintenance unit 140 includes transistor
T51, T52, T53, T54, T42 and T32.Second drop-down maintenance unit 150 include transistor T61, T62, T63, T64, T43 and
T33。
Pull-up unit 120, which is mainly responsible for, exports clock signal CK for horizontal time-base G (n), including transistor T21.
Pull-up control unit 110 is responsible for the opening time of control pull-up unit 120, including transistor T11, the lower communication ST of preceding level Four
(n-4) it is input to the grid of transistor T11, the horizontal time-base G (n-4) of preceding level Four is input to the drain electrode of transistor T11, brilliant
The source electrode of body pipe T11 is connected to the grid of transistor T21.Drop-down unit 130 is responsible for drawing horizontal time-base in first time
Low is low potential, i.e. closing horizontal time-base, including transistor T31 and T41, the horizontal time-base G (n+5) of rear Pyatyi defeated
Enter the grid to transistor T31 and T41.Drop-down maintenance unit 140,150 are responsible for horizontal time-base G (n) and pull-up electricity
The grid signal point Q (N) on road is maintained in off position (i.e. negative potential), two drop-down maintenance units 140 and 150 alternately under
Maintenance effect is drawn, when a drop-down maintenance unit acts on, all transistors of another drop-down maintenance unit are in non-work
Use the phase.Capacitor Cb is then responsible for the secondary lifting of grid signal point Q (N) current potential, and the G (n) for being conducive to pull-up circuit in this way is defeated
Out.Transistor T22 is for exporting communication ST (n) under the same level.VSS indicates DC low-voltage, S (n), P (n), K (n) and T (n)
For node.
With the pursuit to narrow frame and Rimless visual effect, this design is very uneconomical on plate face space.
Summary of the invention
The purpose of the present invention is to provide a kind of GOA circuits in saving GOA circuit occupied space on a display panel
And display device.Another object of the present invention is to provide the TFT quantity in a kind of reduction circuit, to save GOA circuit
Occupied space also reduces the GOA circuit and display device of power consumption to a certain extent.
To achieve the above object, one technical scheme adopted by the invention is that: provide a kind of GOA circuit, including cascade
Multiple GOA units, each GOA unit include pull-up control unit, pull-up unit, drop-down unit and pull down maintenance unit,
Each drop-down maintenance unit includes drop-down maintenance module, the first pull-down module and the second pull-down module, and every two is adjacent
GOA unit constitute one group, in same group, the drop-down maintenance module of higher level's GOA unit controls the in higher level's GOA unit
Second pull-down module of one pull-down module and junior's GOA unit is with by the grid signal of higher level's GOA unit and junior's GOA unit point
Low potential is maintained with the current potential of horizontal time-base, and the drop-down maintenance module of junior's GOA unit controls in junior's GOA unit
The first pull-down module and higher level's GOA unit the second pull-down module with by the grid of junior's GOA unit and higher level's GOA unit believe
The current potential of number point and horizontal time-base maintains low potential.
Optionally, the common point in the common point and junior's GOA unit in higher level's GOA unit is directly connected to, with wherein
The grid signal point of at least one GOA unit when being in high potential, without pulling down maintenance effect.
Optionally, to the drop-down maintenance module of higher level's GOA unit, second clock signal is input to the first clock signal input
The drop-down maintenance module of junior's GOA unit.
Optionally, the drop-down maintenance module of higher level's GOA unit and junior's GOA unit, the first pull-down module and the second drop-down
Module is separately connected.
Optionally, when the grid signal of certain level-one GOA unit point is high potential, the drop-down in the GOA unit maintains mould
Block is not had an effect.
Optionally, the first pull-down module and the second pull-down module are that grid signal point and DC low-voltage are connected to each other simultaneously
And the switch module that the output end of horizontal time-base and DC low-voltage are connected to each other.
Optionally, the drop-down maintenance module of higher level's GOA unit includes: the first transistor, grid and drain electrode access
First clock signal, source electrode are connected to the first common point of higher level's GOA unit；Second transistor, grid are connected to higher level GOA
The grid signal point of unit, drain electrode are connected to the first common point of higher level's GOA unit, and source electrode is connected to DC low-voltage；Third
Transistor, grid are connected to the first common point of higher level's GOA unit, drain electrode the first clock signal of access, and source electrode is connected to
Second common point of grade GOA unit；4th transistor, grid are connected to the grid signal point of higher level's GOA unit, drain electrode connection
To the second common point of higher level's GOA unit, source electrode is connected to DC low-voltage.Moreover, the drop-down of junior's GOA unit maintains
Module includes: the 9th transistor, and grid and drain electrode access second clock signal, source electrode are connected to the first of junior's GOA unit
Common point；Tenth transistor, grid are connected to the grid signal point of junior's GOA unit, and drain electrode is connected to junior's GOA unit
First common point, source electrode are connected to DC low-voltage；11st transistor, grid are connected to the first public affairs of junior's GOA unit
Concurrent, drain electrode access second clock signal, source electrode are connected to the second common point of junior's GOA unit；Tenth two-transistor, grid
Pole is connected to the grid signal point of junior's GOA unit, and drain electrode is connected to the second common point of junior's GOA unit, and source electrode is connected to
DC low-voltage；Wherein, the first common point of higher level's GOA unit and the first common point of junior's GOA unit are connected with each other.
Optionally, the first pull-down module of higher level's GOA unit includes: the 5th transistor, and grid is connected to higher level
Second common point of GOA unit, drain electrode are connected to the horizontal time-base output end of higher level's GOA unit, and source electrode is connected to direct current
Low-voltage；6th transistor, grid are connected to the second common point of higher level's GOA unit, and drain electrode is connected to higher level's GOA unit
Grid signal point, source electrode are connected to DC low-voltage.Moreover, the second pull-down module of higher level's GOA unit includes: the 7th crystalline substance
Body pipe, grid are connected to the second common point of junior's GOA unit, and drain electrode is connected to the horizontal time-base of higher level's GOA unit
Output end, source electrode are connected to DC low-voltage；8th transistor, grid are connected to the second common point of junior's GOA unit, leakage
Pole is connected to the grid signal point of higher level's GOA unit, and source electrode is connected to DC low-voltage.
Optionally, the first pull-down module of junior's GOA unit includes: the 13rd transistor, and grid is connected to down
Second common point of grade GOA unit, drain electrode are connected to the horizontal time-base output end of junior's GOA unit, and source electrode is connected to directly
Flow low-voltage；14th transistor, grid are connected to the second common point of junior's GOA unit, and it is mono- that drain electrode is connected to junior GOA
The grid signal point of member, source electrode are connected to DC low-voltage.Moreover, the second pull-down module of junior's GOA unit includes:
15 transistors, grid are connected to the second common point of higher level's GOA unit, and the level that drain electrode is connected to junior's GOA unit is swept
Signal output end is retouched, source electrode is connected to DC low-voltage；16th transistor, grid are connected to the second of higher level's GOA unit
Common point, drain electrode are connected to the grid signal point of junior's GOA unit, and source electrode is connected to DC low-voltage.
Optionally, the drop-down maintenance unit of higher level's GOA unit further includes the 27th transistor, and the described 27th
The grid of transistor is connected to the grid signal point of junior's GOA unit, and drain electrode is connected to the second common point of higher level's GOA unit,
Source electrode accesses DC low-voltage；The drop-down maintenance unit of junior's GOA unit further includes the 28th transistor, and described second
The grid of 18 transistors is connected to the grid signal point of higher level's GOA unit, and it is second public to be connected to junior's GOA unit for drain electrode
Point, source electrode access DC low-voltage.
Optionally, higher level's GOA unit further include: the 29th transistor, grid are connected to junior's GOA unit
Second common point, drain electrode are connected to the biography signal output end down of higher level's GOA unit, and source electrode accesses DC low-voltage；30th is brilliant
Body pipe, grid are connected to the second common point of higher level's GOA unit, and drain electrode is connected to the lower communication number output of higher level's GOA unit
End, source electrode access DC low-voltage；Junior's GOA unit further include: the 31st transistor, grid are connected to higher level
Second common point of GOA unit, drain electrode are connected to the biography signal output end down of junior's GOA unit, and source electrode is connected to the low electricity of direct current
Pressure；30th two-transistor, grid are connected to the second common point of junior's GOA unit, and drain electrode is connected to junior's GOA unit
Under pass signal output end, source electrode accesses DC low-voltage.
Optionally, the horizontal time-base or constant of the pull-up control unit access front level-one GOA unit
DC voltage.
Optionally, the pull-up control unit of n-th grade of GOA unit access the horizontal time-base of the n-th -2m grade GOA unit with
Lower communication number, the drop-down unit of n-th grade of GOA unit access the horizontal time-base of the n-th+2m grades of GOA unit, and n, m are positive integer.
Optionally, the pull-up control unit of n-th grade of GOA unit access the horizontal time-base of the n-th -2m grade GOA unit with
Lower communication number, the drop-down unit of n-th grade of GOA unit access the horizontal time-base of the n-th+2m+1 grades of GOA unit, and n, m are positive whole
Number.
For another technical solution used in the present invention there is provided a kind of display device, the display device includes aforementioned
A kind of GOA circuit and circuit made of being combined.
The present invention is by by the drop-down maintenance unit of the drop-down maintenance unit of n-th grade of GOA unit and (n+1)th grade of GOA unit
It is coupled to each other, to share respective drop-down maintenance unit.As a result, compared with the existing technology, GOA units at different levels can be with
Plate face space occupied by a drop-down maintenance unit is reduced, but GOA circuit actual working state but still tie up by two drop-downs
Unit is held in alternating action, i.e., neither influences GOA circuit using two and alternates drop-down maintenance unit to reduce pull-down circuit
Lasting loss (Stress), also saves the plate face space of entire GOA circuit, is conducive to the realization of narrow frame display panel.
Moreover, the power consumption of drop-down maintenance unit can be reduced, to reduce power consumption.
Detailed description of the invention
Fig. 1 is the circuit diagram of existing GOA unit.
Fig. 2 is the attachment structure schematic diagram for showing GOA unit according to the present invention.
Fig. 3 is the circuit diagram for showing GOA unit according to a first embodiment of the present invention.
Fig. 4 is the circuit diagram for showing GOA unit according to a second embodiment of the present invention.
Fig. 5 is the circuit diagram for showing GOA unit according to a third embodiment of the present invention.
Specific embodiment
To comply with consumer to display the narrow frame even pursuit of Rimless visual effect, the side liquid crystal display gate is driven
It is dynamic to be realized using GOA technology, at the same to GOA occupy the side panel gate space propose it is extremely challenging, in order to
Guarantee the space for reducing GOA circuit under the premise of GOA circuit drives function, is efficiently maintained using drop-down present applicant proposes a kind of
The method of unit.
Fig. 2 is the attachment structure schematic diagram for showing GOA unit according to the present invention.
Referring to Fig. 2, GOA circuit includes cascade multiple GOA units.By taking n-th grade of GOA unit as an example, n-th grade of GOA unit
Including pull-up control unit 11, pull-up unit 12, drop-down unit 13 and drop-down maintenance unit 14, drop-down maintenance unit 14 includes
Pull down maintenance module 141, the first pull-down module 142 and the second pull-down module 143.
Pull-up control unit 11 accesses horizontal time-base G (n-4) and pull-up control unit 11 is connected to n-th grade of grid
Signaling point Q (n).Horizontal time-base G (n-4) is the horizontal time-base of preceding level Four, for example, level V GOA is mono- as n=5
The horizontal time-base G (1) of G (n-4) the input terminal access first order GOA unit of member.But not limited to this, before can also accessing
The horizontal time-base of any level-one in face, or constant DC voltage VGH can be accessed to replace the level of front level-one
Scanning signal.
Pull-up unit 12 is connected respectively to n-th grade of grid signal point Q (n) and n-th grade of horizontal time-base G (n) output end,
And pull-up unit 12 accesses n-th grade of clock signal CK (n).Pull-up unit 12 is according to the control of pull-up control unit 11 come by institute
Stating clock signal CK (n) output is n-th grade of horizontal time-base G (n).
Drop-down unit 13 is connected respectively to n-th grade of grid signal point Q (n) and n-th grade of horizontal time-base G (n) output end.
Drop-down unit 13 can be such that n-th grade of grid signal point Q (n) and the current potential of n-th grade of horizontal time-base G (n) drags down rapidly.Drop-down
Unit 13 accesses the n-th+4 grades horizontal time-base G (n+4).
Pull down maintenance unit 14 access the first clock signal LC1, drop-down maintenance unit 14 include drop-down maintenance module 141,
First pull-down module 142 and the second pull-down module 143.First pull-down module 142 is connected respectively to n-th grade of grid signal point Q (n)
With n-th grade of horizontal time-base G (n) output end, the second pull-down module 143 is also connected to n-th grade of grid signal point Q (n)
With n-th grade of horizontal time-base G (n) output end.Drop-down maintenance module 141 is connect with n-th grade of grid signal point Q (n), and with the
One pull-down module 142 and the connection of aftermentioned (n+1)th grade of the second pull-down module 243, and pull down maintenance module 141 and pass through control
First pull-down module 142 and the second pull-down module 243 are by n-th grade of grid signal point Q (n) and n-th grade of horizontal time-base G
(n) and (n+1)th grade of grid signal point Q (n+1) and (n+1)th grade of horizontal time-base G (n+1) maintain low potential.
Similarly, by taking (n+1)th grade of GOA unit as an example, (n+1)th grade of GOA unit includes pull-up control unit 21, pull-up unit
22, drop-down unit 23 and drop-down maintenance unit 24, drop-down maintenance unit 24 include the lower drawing-die of drop-down maintenance module 241, first
Block 242 and the second pull-down module 243.
Pull-up control unit 21 accesses horizontal time-base G (n-3) and pull-up control unit 21 is connected to (n+1)th grade of grid
Pole signaling point Q (n+1).Horizontal time-base G (n-3) is the horizontal time-base of preceding level Four, for example, as n=5, the 6th grade
The horizontal time-base G (2) of G (n-3) the input terminal connection second level GOA unit of GOA unit.But it as previously mentioned, can also be with
The horizontal time-base of any level-one in access front, or constant DC voltage VGH can be accessed.
Pull-up unit 22 is connected respectively to (n+1)th grade of grid signal point Q (n+1) and (n+1)th grade of horizontal time-base G (n+
1) output end, and pull-up unit 22 accesses (n+1)th grade of clock signal CK (n+1).Pull-up unit 22 is according to pull-up control unit
The clock signal CK (n+1) output is (n+1)th grade of horizontal time-base G (n+1) by 21 control.
Drop-down unit 23 is connected respectively to (n+1)th grade of grid signal point Q (n+1) and (n+1)th grade of horizontal time-base G (n+
1) output end.Drop-down unit 23 can make (n+1)th grade of grid signal point Q (n+1) and (n+1)th grade of horizontal time-base G (n+1)
Current potential drags down rapidly.Drop-down unit 23 accesses the n-th+5 grades horizontal time-base G (n+5).
Pull down maintenance unit 24 access second clock signal LC2, drop-down maintenance unit 24 include drop-down maintenance module 241,
First pull-down module 242 and the second pull-down module 243.First pull-down module 242 is connected respectively to (n+1)th grade of grid signal point Q
(n+1) and (n+1)th grade of horizontal time-base G (n+1) output end, the second pull-down module 243 are also connected to (n+1)th grade of grid
Signaling point Q (n+1) and (n+1)th grade of horizontal time-base G (n+1) output end.It pulls down maintenance module 241 and (n+1)th grade of grid is believed
Number point Q (n+1) connection, and connect with the first pull-down module 242 and n-th grade of the second pull-down module 143, and pull down maintenance mould
Block 241 is by controlling the first pull-down module 242 and the second pull-down module 143 for (n+1)th grade of grid signal point Q (n+1) and n-th
+ 1 grade of horizontal time-base G (n+1) and n-th grade of grid signal point Q (n) and n-th grade of horizontal time-base G (n) maintain low electricity
Position.Moreover, drop-down maintenance module 241 and drop-down maintenance module 141 also interconnect.
Fig. 3 is the circuit diagram for showing GOA unit according to a first embodiment of the present invention.Wherein, GOA circuit access first is straight
It flows low-voltage VSS1 and the second DC low-voltage VSS2, the first DC low-voltage VSS1 is higher than the second DC low-voltage
VSS2.Such design is conducive to the low potential quilt at n-th grade of grid signal point Q (n) and (n+1)th grade of grid signal point Q (n+1)
That draws is lower, so as to maintain the low electricity of n-th grade of horizontal time-base G (n) and (n+1)th grade of horizontal time-base G (n+1)
Position is more stable, is conducive to improve GOA circuit stability and reliability.But it is also possible to one of DC low-voltage is omitted,
And only retain one of them.
The drop-down maintenance module 141 includes: the first transistor T1, and grid and drain electrode access the first clock signal LC1,
Source electrode is connected to n-th grade of first common point S (n)；Second transistor T2, grid are connected to n-th grade of grid signal point Q (n), leakage
Pole is connected to the source electrode of the first transistor T1, and source electrode is connected to the first DC low-voltage VSS1；Third transistor T3, grid connect
It is connected to n-th grade of first common point S (n), drain electrode the first clock signal LC1 of access, source electrode is connected to n-th grade of second common point
P(n)；4th transistor T4, grid are connected to n-th grade of grid signal point Q (n), drain electrode be connected to described n-th grade second it is public
Point P (n), source electrode are connected to the second DC low-voltage VSS2.
First pull-down module 142 includes: the 5th transistor T5, and grid is connected to n-th grade of second common point P
(n), drain electrode is connected to n-th grade of horizontal time-base G (n) output end, and source electrode is connected to the first DC low-voltage VSS1；6th is brilliant
Body pipe T6, grid are connected to n-th grade of second common point P (n), and drain electrode is connected to n-th grade of grid signal point Q (n), source electrode
It is connected to the second DC low-voltage VSS2.
Second pull-down module 143 includes: the 7th transistor T7, and grid is connected to (n+1)th grade of second common point P (n
+ 1), drain electrode is connected to n-th grade of horizontal time-base G (n) output end, and source electrode is connected to the first DC low-voltage VSS1；8th is brilliant
Body pipe T8, grid are connected to the grid of the 7th transistor T7, and drain electrode is connected to n-th grade of grid signal point Q (n), source electrode connection
To the second DC low-voltage VSS2.
The drop-down maintenance module 241 includes: the 9th transistor T9, and grid and drain electrode access second clock signal LC2,
Source electrode is connected to (n+1)th grade of first common point S (n+1)；Tenth transistor T10, grid are connected to (n+1)th grade of grid signal point
Q (n+1), drain electrode are connected to the source electrode of the 9th transistor T9, and source electrode is connected to the first DC low-voltage VSS1；11st transistor
T11, grid are connected to (n+1)th grade of first common point S (n+1), drain electrode access second clock signal LC2, source electrode connection
To (n+1)th grade of second common point P (n+1), wherein (n+1)th grade of first common point S (n+1) is connected to described n-th grade
First common point S (n)；Tenth two-transistor T12, grid are connected to (n+1)th grade of grid signal point Q (n+1), and drain electrode is connected to
(n+1)th grade of second common point P (n+1), source electrode are connected to the second DC low-voltage VSS2.
First pull-down module 242 includes: the 13rd transistor T13, and grid is connected to (n+1)th grade of second public affairs
Concurrent P (n+1), drain electrode are connected to (n+1)th grade of horizontal time-base G (n+1) output end, and source electrode accesses the first DC low-voltage
VSS1；14th transistor T14, grid are connected to (n+1)th grade of second common point P (n+1), and drain electrode is connected to (n+1)th
Grade grid signal point Q (n+1), source electrode are connected to the second DC low-voltage VSS2.
Second pull-down module 243 includes: the 15th transistor T15, grid be connected to described n-th grade second it is public
Point P (n), drain electrode are connected to (n+1)th grade of horizontal time-base G (n+1) output end, and source electrode is connected to the first DC low-voltage
VSS1；16th transistor T16, grid are connected to the grid of the 15th transistor T15, and drain electrode is connected to (n+1)th grade of grid
Signaling point Q (n+1), source electrode are connected to the second DC low-voltage VSS2.
Referring to Fig. 3, by taking n-th grade of GOA unit as an example, it is assumed that all transistors are all N-type transistor.Pull-up control unit 11
Including the 17th transistor T17, the grid of the 17th transistor T17 accesses the n-th -4 grades lower communication ST (n-4), drain electrode access
The n-th -4 grades horizontal time-base G (n-4), source electrode are connected to n-th grade of grid grade signaling point Q (n).Pull-up unit 12 includes the 19th
Transistor T19, grid are connected to n-th grade of grid grade signaling point Q (n), drain incoming clock signal CK (n), and source electrode exports n-th grade
Horizontal time-base G (n).The grid of 20th transistor T20 is connected to n-th grade of grid signal point Q (n), drain electrode connection clock
Signal CK (n), source electrode export n-th grade of lower communication ST (n), wherein capacitor Cb is responsible for the current potential of n-th grade of grid grade signaling point Q (n)
Secondary lifting be conducive to the horizontal time-base G's (n) of pull-up unit 12 so that the 19th transistor T19 is fully connected
Output.
(n+1)th grade of pull-up control unit 21 includes the 18th transistor T18, and pull-up unit 22 includes the 21st transistor
T21, structure is similar with n-th grade of pull-up control unit 11 and pull-up unit 12, and details are not described herein.20th two-transistor
T22's and capacitor Cb is structurally and functionally similar with the 20th transistor T20 and capacitor Cb, and details are not described herein.With n-th grade of GOA
For unit, drop-down unit 13 includes the 23rd transistor T23 and the 24th transistor T24.23rd transistor T23
Grid access the n-th+4 grades horizontal time-base G (n+4), drain electrode access horizontal time-base G (n), source electrode access the first direct current
Low-voltage VSS1.The grid of 24th transistor T24 accesses horizontal time-base G (n+4), and drain electrode is connected to n-th grade of grid
Signaling point Q (n), source electrode access the second DC low-voltage VSS2.Drop-down unit 13 is used at horizontal time-base G (n+4) be height
The current potential of horizontal time-base G (n) and grid grade signaling point Q (n) are dragged down rapidly when current potential.
(n+1)th grade of drop-down unit 23 include the 25th transistor T25 and the 26th transistor T26, structure with
The structure of n-th grade of drop-down unit 13 is similar, and details are not described herein.
The course of work of pull-up control unit 11, pull-up unit 12 and drop-down unit 13 is explained in detail referring to Fig. 3.
It is low potential at horizontal time-base G (n+4) in n-th grade of GOA circuit in the first embodiment referring to Fig. 3
In the case where, the 23rd transistor T23 and the 24th transistor T24 cut-off, communication ST (n-4) is high potential instantly
When, the 17th transistor T17 conducting, if horizontal time-base G (n-4) inputs high potential, n-th grade of grid signal point Q (n) is
High potential, the 20th transistor T20 and the 19th transistor T19 conducting, clock signal CK (n) can export as n-th grade of level
Scanning signal G (n) and n-th grade of lower communication ST (n).In the case where horizontal time-base G (n+4) is high potential, the 20th
Four transistor T24 and the 23rd transistor T23 conducting, n-th grade of grid signal point Q (n) and n-th grade of horizontal time-base G (n)
Current potential be pulled low, n-th grade of horizontal time-base G (n) is low potential.
Similarly, the worked of pull-up control unit 21, pull-up unit 22 and drop-down unit 23 is explained in detail referring to Fig. 3
Journey.In (n+1)th grade of GOA circuit, in the case where horizontal time-base G (n+5) is low potential, the 25th transistor T25
End with the 26th transistor T26, when communication ST (n-3) is high potential instantly, the 18th transistor T18 conducting, if water
Simple scan signal G (n-3) inputs high potential, and (n+1)th grade of grid signal point Q (n+1) is high potential, the 21st transistor T21
Be connected with the 20th two-transistor T22, clock signal CK (n+1) can export as (n+1)th grade of horizontal time-base G (n+1) and
(n+1)th grade of lower communication ST (n+1).In the case where horizontal time-base G (n+5) is high potential, the 25th transistor T25
It is connected with the 26th transistor T26, (n+1)th grade of grid signal point Q (n+1) and (n+1)th grade of horizontal time-base G (n+1)
Current potential is pulled low, and (n+1)th grade of horizontal time-base G (n) is low potential.
In order to keep the 17th transistor T17 more sufficiently conductive, horizontal time-base G (n-4) can be substituted for constant straight
Galvanic electricity presses VGH.Similarly, in order to keep the 18th transistor T18 more sufficiently conductive, horizontal time-base G (n-3) can be substituted for
Constant DC voltage VGH.
The course of work of drop-down maintenance unit is described referring to Fig. 3.First clock signal LC1 and second clock signal LC2
It is separately input to drop-down maintenance unit 14 and pulls down maintenance unit 24.In particular, n-th grade of grid signal point Q (n) and n-th+
The current potential of 1 grade of grid signal point Q (n+1) be low potential in the case where, when the first clock signal LC1 current potential be high potential and
The current potential of second clock signal LC2 be low potential when, the first transistor T1 and third transistor T3 conducting, second transistor T2 and
The current potential of 4th transistor T4 cut-off, n-th grade of second common point P (n) is high potential, so that the 5th transistor T5 and the 6th crystal
Pipe T6 conducting, n-th grade of grid signal point Q (n) and horizontal time-base G (n) maintain low potential.Meanwhile the 15th transistor T15
It is connected with the 16th transistor T16, so that (n+1)th grade of grid signal point Q (n+1) and horizontal time-base G (n+1) maintain low electricity
Position.Similarly, when the current potential that the current potential of the first clock signal LC1 is low potential and second clock signal LC2 is high potential,
N-th grade of grid signal point Q (n) and horizontal time-base G (n) maintain low potential, and (n+1)th grade of grid signal point Q (n+1) and
Horizontal time-base G (n+1) maintains low potential.
In the current potential that the current potential of n-th grade of grid signal point Q (n) is low potential and (n+1)th grade of grid signal point Q (n+1)
In the case where for high potential, when the current potential that the current potential of the first clock signal LC1 is high potential and second clock signal LC2 is low
When current potential, the first transistor T1 conducting, while the tenth transistor T10 and the tenth two-transistor T12 conducting, pass through what is be connected to each other
N-th grade of first common point S (n) and (n+1)th grade of first common point S (n+1), so that n-th grade of first common point S (n) becomes low electricity
Position, to not have an effect to the current potential of n-th grade of grid signal point Q (n) He n-th grade of horizontal time-base G (n), and to n-th
The current potential of+1 grade of grid signal point Q (n+1) and (n+1)th grade of horizontal time-base G (n+1) is not also had an effect.Similarly,
The current potential of n grades of grid signal point Q (n) is that the current potential of low potential and (n+1)th grade of grid signal point Q (n+1) is the feelings of high potential
Under condition, when the current potential that the current potential of the first clock signal LC1 is low potential and second clock signal LC2 is high potential, to n-th
The current potential of grade grid signal point Q (n) and horizontal time-base G (n) is not had an effect, and to (n+1)th grade of grid signal point Q (n
+ 1) it does not also have an effect with the current potential of horizontal time-base G (n+1).
It similarly, is high potential and (n+1)th grade of grid signal point Q (n+1) in the current potential of n-th grade of grid signal point Q (n)
Current potential be the current potential of low potential or n-th grade of grid signal point Q (n) be high potential and (n+1)th grade of grid signal point Q (n+
1) in the case that current potential is high potential, to the current potential and n-th of n-th grade of grid signal point Q (n) and horizontal time-base G (n)
The current potential of+1 grade of grid signal point Q (n+1) and horizontal time-base G (n+1) are not had an effect (that is, drop-down maintenance unit does not rise
Effect).
In GOA circuit according to first embodiment, for every level-one GOA unit, single-stage in the prior art is eliminated
One drop-down maintenance unit of GOA unit only retains a drop-down maintenance unit.For the GOA unit of adjacent two-stage, phase
When in every grade of GOA unit or there are two pull down maintenance unit, but another one pull down maintenance unit using adjacent
It the clock signal (LC2 or LC1) of grade and is made of four transistors (T9, T10, T11 and T12 or T1, T2, T3 and T4)
Start-up circuit.The control of drop-down maintenance unit, every grade of reduction are realized in such design in such a way that the superior and the subordinate share S (n) point
Plate face space occupied by four transistors and signal source, is conducive to the realization of narrow frame display.Moreover, adopting simultaneously
With two DC low-voltages, the voltage value of the first DC low-voltage VSS1 is higher than the voltage value of the second DC low-voltage VSS2, has
Drawn conducive to the low potential at n-th grade of grid signal point Q (n) and (n+1)th grade of grid signal point Q (n+1) it is lower, so as to
Enough maintain the low potential of n-th grade of horizontal time-base G (n) and (n+1)th grade of horizontal time-base G (n+1) more stable, favorably
In raising GOA circuit stability and reliability.
Fig. 4 is the circuit diagram for showing GOA unit according to a second embodiment of the present invention.
As shown in figure 4, n-th grade of drop-down maintenance unit further includes the 27th transistor T27, grid is connected to (n+1)th
Grade grid signal point Q (n+1), drain electrode are connected to the grid of the 6th transistor T6, and source electrode accesses the second DC low-voltage VSS2；The
N+1 grades of drop-down maintenance units further include the 28th transistor T28, and grid is connected to n-th grade of grid signal point Q (n), drain electrode
It is connected to the grid of the 13rd transistor T13, source electrode accesses the second DC low-voltage VSS2.
On the basis of first embodiment, every grade of GOA unit increases a transistor, can share n-th grade of grid signal
Point Q (n) and (n+1)th grade of grid signal point Q (n+1) are conducive to n-th grade of second common point P (n) and (n+1)th grade the described
The release of the high potential of two common point P (n+1), to reduce the 5th transistor T5 and the 6th transistor T6 and the 13rd crystal
The loss of pipe T13 and the 14th transistor T14.Because of the 5th transistor T5 and the 6th transistor T6 and the 13rd transistor
T13 and the 14th transistor T14 is in GOA circuit by the maximum transistor of loss, the 27th transistor T27 of the present embodiment
The reliability of entire GOA circuit can be improved with the 28th transistor T28 and prolonged the service life.
Fig. 5 is the circuit diagram for showing GOA unit according to a third embodiment of the present invention.
As shown in figure 5, n-th grade of drop-down maintenance unit further include: the 29th transistor T29, grid are connected to the tenth
The grid of three transistor T13, drain electrode n-th grade of lower communication ST (n) of access, source electrode access the first DC low-voltage VSS1；Third
Ten transistor T30, grid are connected to n-th grade of second common point P (n), drain electrode n-th grade of lower communication ST (n) of access, source
The first DC low-voltage VSS1 is accessed in pole.(n+1)th grade of drop-down maintenance unit further include: the 31st transistor T31, grid connect
It is connected to the grid of the 30th transistor T30, drain electrode (n+1)th grade of lower communication ST (n+1) of access, it is low that source electrode is connected to the first direct current
Voltage VSS1；30th two-transistor T32, grid are connected to the grid of the 29th transistor T29, drain electrode access (n+1)th
Grade is lower communication ST (n+1), and source electrode accesses the first DC low-voltage VSS1.
In n-th grade of GOA unit, before the grid of the 17th transistor T17 of pull-up control unit 11 accesses under level Four
Communication ST (n-4), for the preferably stable lower communication ST (n) exported by n-th grade, each GOA unit increases by two
Transistor so that being in stable low potential between inaction period by the lower communication ST (n) of n-th grade of output, rather than is located
Hanging (floating) state in traditional circuit, can preferably control the closed state of the 17th transistor T17 in this way,
To keep the current potential of n-th grade of grid signal point Q (n) and n-th grade of horizontal time-base G (n) more stable, be conducive to entire GOA
The stability of circuit.
Similarly, in (n+1)th grade of GOA unit, increase the 31st transistor T31 and the 30th two-transistor T32, from
And keep (n+1)th grade of grid signal point Q (n+1), the current potential of (n+1)th grade of horizontal time-base G (n+1) more stable, be conducive to whole
The stability of a GOA circuit.
Although showing the 27th transistor T27 and the 28th transistor T28 in Fig. 5, this also can be omitted
Two transistors.
The above transistor by taking N-type transistor as an example, but not limited to this.
Moreover, the ST (n-4), G (n-4) and G (n+4) in foregoing embodiments and its variation can be substituted for simultaneously respectively
ST (n-2), G (n-2) and G (n+2), ST (n-6), G (n-6) and G (n+6), the n such as ST (n-8), G (n-8) and G (n+8) subtract idol
Several and n adds the combination of even number.
Alternatively, the ST (n-4), G (n-4) and G (n+4) in foregoing embodiments and its variation can be substituted for simultaneously respectively
ST (n-4), G (n-4) and G (n+5), ST (n-2), G (n-2) and G (n+3), ST (n-6), G (n-6) and G (n+7), ST (n-8),
The n such as G (n-8) and G (n+9) subtract even number and n adds the combination of even number+1.
In other words, foregoing embodiments and its ST (n-4), G (n-4) in variation and G (n+4) these input signals can
Appropriate replacement as needed, and it is not limited only to foregoing manner.
What said above is not limited to this hair only to facilitate the embodiment for understanding the present invention and using
It is bright.Any those skilled in the art to which this invention pertains, do not depart from disclosed herein spirit and scope premise
Under, any modification and change can be made in the implementing form and in details, but scope of patent protection of the invention, still must be with
Subject to the range that claims are defined.
Claims (11)
1. a kind of GOA circuit, including cascade multiple GOA units, each GOA unit includes pull-up control unit, pull-up list
Member, drop-down unit and drop-down maintenance unit, which is characterized in that
Each drop-down maintenance unit includes pulling down maintenance module, the first pull-down module and the second pull-down module,
And every two adjacent GOA unit constitutes one group, and in same group, the drop-down maintenance module of higher level's GOA unit is controlled
Second pull-down module of the first pull-down module and junior's GOA unit in higher level's GOA unit is with by higher level's GOA unit and junior
The grid signal point of GOA unit and the current potential of horizontal time-base maintain low potential, and the drop-down maintenance module of junior's GOA unit
Control the second pull-down module of the first pull-down module and higher level's GOA unit in junior's GOA unit with by junior's GOA unit and
The grid signal point of higher level's GOA unit and the current potential of horizontal time-base maintain low potential；
The drop-down maintenance module of higher level's GOA unit includes:
It is first public to be connected to higher level's GOA unit for the first transistor, grid and drain electrode the first clock signal of access, source electrode
Point；
Second transistor, grid are connected to the grid signal point of higher level's GOA unit, and drain electrode is connected to the of higher level's GOA unit
One common point, source electrode are connected to DC low-voltage；
Third transistor, grid are connected to the first common point of higher level's GOA unit, drain electrode the first clock signal of access, source electrode
It is connected to the second common point of higher level's GOA unit；
4th transistor, grid are connected to the grid signal point of higher level's GOA unit, and drain electrode is connected to the of higher level's GOA unit
Two common points, source electrode are connected to DC low-voltage；
The drop-down maintenance module of junior's GOA unit includes:
It is first public to be connected to junior's GOA unit for 9th transistor, grid and drain electrode access second clock signal, source electrode
Point；
Tenth transistor, grid are connected to the grid signal point of junior's GOA unit, and drain electrode is connected to the of junior's GOA unit
One common point, source electrode are connected to DC low-voltage；
11st transistor, grid are connected to the first common point of junior's GOA unit, drain electrode access second clock signal, source
Pole is connected to the second common point of junior's GOA unit；
Tenth two-transistor, grid are connected to the grid signal point of junior's GOA unit, and drain electrode is connected to junior's GOA unit
Second common point, source electrode are connected to DC low-voltage；
Wherein, the first common point of higher level's GOA unit and the first common point of junior's GOA unit are connected with each other；
First pull-down module of higher level's GOA unit includes:
5th transistor, grid are connected to the second common point of higher level's GOA unit, and drain electrode is connected to the water of higher level's GOA unit
Simple scan signal output end, source electrode are connected to DC low-voltage；
6th transistor, grid are connected to the second common point of higher level's GOA unit, and drain electrode is connected to the grid of higher level's GOA unit
Pole signaling point, source electrode are connected to DC low-voltage；
Second pull-down module of higher level's GOA unit includes:
7th transistor, grid are connected to the second common point of junior's GOA unit, and drain electrode is connected to the water of higher level's GOA unit
Simple scan signal output end, source electrode are connected to DC low-voltage；
8th transistor, grid are connected to the second common point of junior's GOA unit, and drain electrode is connected to the grid of higher level's GOA unit
Pole signaling point, source electrode are connected to DC low-voltage；
First pull-down module of junior's GOA unit includes:
13rd transistor, grid are connected to the second common point of junior's GOA unit, and drain electrode is connected to junior's GOA unit
Horizontal time-base output end, source electrode are connected to DC low-voltage；
14th transistor, grid are connected to the second common point of junior's GOA unit, and drain electrode is connected to junior's GOA unit
Grid signal point, source electrode are connected to DC low-voltage；
Second pull-down module of junior's GOA unit includes:
15th transistor, grid are connected to the second common point of higher level's GOA unit, and drain electrode is connected to junior's GOA unit
Horizontal time-base output end, source electrode are connected to DC low-voltage；
16th transistor, grid are connected to the second common point of higher level's GOA unit, and drain electrode is connected to junior's GOA unit
Grid signal point, source electrode are connected to DC low-voltage；
The drop-down maintenance unit of higher level's GOA unit further includes the 27th transistor, the grid of the 27th transistor
Pole is connected to the grid signal point of junior's GOA unit, and drain electrode is connected to the second common point of higher level's GOA unit, and source electrode access is straight
Flow low-voltage；The drop-down maintenance unit of junior's GOA unit further includes the 28th transistor, the 28th transistor
Grid be connected to the grid signal point of higher level's GOA unit, drain electrode is connected to the second common point of junior's GOA unit, and source electrode connects
Enter DC low-voltage.
2. GOA circuit as described in claim 1, which is characterized in that common point and junior's GOA unit in higher level's GOA unit
Interior common point is directly connected to, with when the grid signal of at least one GOA unit wherein point is in high potential, without under
Draw maintenance effect.
3. GOA circuit as described in claim 1, which is characterized in that drop-down of first clock signal input to higher level's GOA unit
Maintenance module, second clock signal are input to the drop-down maintenance module of junior's GOA unit.
4. GOA circuit as described in claim 1, which is characterized in that the drop-down of higher level's GOA unit and junior's GOA unit maintains
Module, the first pull-down module and the second pull-down module are separately connected DC low-voltage.
5. GOA circuit as claimed in claim 4, which is characterized in that when the grid signal point of certain level-one GOA unit is high potential
When, the drop-down maintenance module in the GOA unit is not had an effect.
6. GOA circuit as claimed in claim 4, which is characterized in that the first pull-down module and the second pull-down module are by grid
Signaling point and DC low-voltage are connected to each other and open what the output end of horizontal time-base and DC low-voltage were connected to each other
Close module.
7. GOA circuit as described in claim 1, which is characterized in that higher level's GOA unit further include:
29th transistor, grid are connected to the second common point of junior's GOA unit, and drain electrode is connected to higher level's GOA unit
Biography signal output end down, source electrode access DC low-voltage；
30th transistor, grid are connected to the second common point of higher level's GOA unit, and drain electrode is connected to higher level's GOA unit
Under pass signal output end, source electrode accesses DC low-voltage；
Junior's GOA unit further include:
31st transistor, grid are connected to the second common point of higher level's GOA unit, and drain electrode is connected to junior's GOA unit
Biography signal output end, source electrode down be connected to DC low-voltage；
30th two-transistor, grid are connected to the second common point of junior's GOA unit, and drain electrode is connected to junior's GOA unit
Biography signal output end down, source electrode access DC low-voltage.
8. the GOA circuit as described in any one of claims 1 to 7, which is characterized in that pull-up control unit access front
The horizontal time-base of certain level-one GOA unit or constant DC voltage.
9. the GOA circuit as described in any one of claims 1 to 7, which is characterized in that the pull-up of n-th grade of GOA unit controls single
Member access the n-th -2m grade GOA unit horizontal time-base and lower communication number, the drop-down unit of n-th grade of GOA unit accesses n-th+
The horizontal time-base of 2m grades of GOA units, n, m are positive integer.
10. the GOA circuit as described in any one of claims 1 to 7, which is characterized in that the pull-up control of n-th grade of GOA unit
Unit accesses the horizontal time-base of the n-th -2m grades of GOA unit and lower communication number, the drop-down unit of n-th grade of GOA unit access n-th
The horizontal time-base of+2m+1 grades of GOA units, n, m are positive integer.
11. a kind of display device, which is characterized in that the display device includes as described in any one of claims 1 to 10
GOA circuit.
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| CN105185292A (en) * | 2015-10-09 | 2015-12-23 | 昆山龙腾光电有限公司 | GIA circuit and display device |
| CN106023933A (en) * | 2016-07-21 | 2016-10-12 | 深圳市华星光电技术有限公司 | GOA (Gate Driver on Array) circuit and liquid crystal display |
| CN106205458A (en) * | 2016-08-30 | 2016-12-07 | 深圳市华星光电技术有限公司 | A kind of GOA driver element |
| CN106448607A (en) * | 2016-11-28 | 2017-02-22 | 深圳市华星光电技术有限公司 | GOA (gate driver on array) driving circuit and liquid crystal display device |
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| CN106652936A (en) | 2017-05-10 |
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