CN105741742B - A kind of shift register cell, gate driving circuit and its driving method - Google Patents

A kind of shift register cell, gate driving circuit and its driving method Download PDF

Info

Publication number
CN105741742B
CN105741742B CN201610304697.0A CN201610304697A CN105741742B CN 105741742 B CN105741742 B CN 105741742B CN 201610304697 A CN201610304697 A CN 201610304697A CN 105741742 B CN105741742 B CN 105741742B
Authority
CN
China
Prior art keywords
output
voltage
pull
switching tube
module
Prior art date
Application number
CN201610304697.0A
Other languages
Chinese (zh)
Other versions
CN105741742A (en
Inventor
冯思林
李红敏
Original Assignee
京东方科技集团股份有限公司
合肥京东方光电科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京东方科技集团股份有限公司, 合肥京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to CN201610304697.0A priority Critical patent/CN105741742B/en
Publication of CN105741742A publication Critical patent/CN105741742A/en
Application granted granted Critical
Publication of CN105741742B publication Critical patent/CN105741742B/en

Links

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/2007Display of intermediate tones
    • G09G3/2018Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11CSTATIC STORES
    • G11C19/00Digital stores in which the information is moved stepwise, e.g. shift register stack stores, push-down stores
    • G11C19/28Digital stores in which the information is moved stepwise, e.g. shift register stack stores, push-down stores using semiconductor elements

Abstract

The present invention discloses a kind of shift register cell, gate driving circuit and its driving method, is related to field of display technology, to solve the problems, such as to be easy to occur accidentally exporting due to being coupled crosstalk because of the output module in shift register cell.The shift register cell includes: input module, output module, reseting module and pull-down control module;In reseting stage, reseting module is used under the action of reset signal, and the output end voltage of the voltage of pull-up node and output module is pulled low to gate off voltage;Pull-down control module is used to that the output end voltage of the voltage of pull-up node and output module to be pulled low to gate off voltage under the action of drop-down controls signal;In the stage of holding, pull-down control module is used to make the output end voltage of output module be maintained at gate off voltage under the action of drop-down controls signal.Shift register cell provided by the invention is for providing gate drive signal.

Description

A kind of shift register cell, gate driving circuit and its driving method

Technical field

The present invention relates to field of display technology more particularly to a kind of shift register cells, gate driving circuit and its drive Dynamic method.

Background technique

With the continuous development of display technology, more and more display devices drive (Gate On using array substrate row Array, hereinafter referred to as GOA) technology, this GOA technology is that gate driving circuit is directly integrated in the non-display of array substrate On region, the border width of array substrate is largely reduced.The gate driving circuit packet being integrated in array substrate Several shift register cells, a grid line on each shift register cell corresponding array substrate are included, and passes through output Gate drive signal realizes the driving to this grid line.

Traditional shift register cell generally comprises input module, energy-storage module, output module and reseting module, this The course of work of shift register cell are as follows: in input phase, input module is by the voltage high of pull-up node;In output rank Section, under the action of energy-storage module, output module exports gate drive signal;In reseting stage, reseting module is by pull-up node Voltage and gate drive signal be reset to gate off voltage;In the stage of holding, the output end of output module can be had been at Suspended state, and keep gate off voltage.Since each module in shift register cell can have leakage during the work time The disturbed conditions such as electricity, and the output end of output module is in suspended state, this allows for output module and is easy to be coupled crosstalk Shift register cell is caused the problem of accidentally exporting occur.

Summary of the invention

The purpose of the present invention is to provide a kind of shift register cell, gate driving circuit and its driving methods, are used for It solves the problems, such as to be easy to occur accidentally exporting due to being coupled crosstalk because of the output module in shift register cell.

To achieve the goals above, the invention provides the following technical scheme:

The first aspect of the present invention provides a kind of shift register cell, a work week of the shift register cell Phase includes: input phase, output stage, reseting stage and is kept for the stage, and the shift register cell includes: input module, In the input phase, the input module is used under the action of input signal, by the voltage high of pull-up node;Export mould Block, in the output stage, the output module is used under the action of clock signal, exports gate drive signal;Reset mould Block, in the reseting stage, the reseting module is used under the action of the reset signal, by the voltage of the pull-up node Gate off voltage is pulled low to the output end voltage of the output module;Pull-down control module, in the reseting stage, institute Pull-down control module is stated under the action of drop-down controls signal, by the voltage of the pull-up node and the output module Output end voltage is pulled low to the gate off voltage;In the holding stage, the pull-down control module is used for described Under the action of drop-down control signal, the output end voltage of the output module is made to be maintained at the gate off voltage.

Based on the technical solution of above-mentioned shift register cell, the second aspect of the present invention provides a kind of gate driving electricity Road, including m above-mentioned shift register cells, wherein m is the integer more than or equal to 1.

Based on the technical solution of above-mentioned gate driving circuit, the third aspect of the present invention provides a kind of gate driving circuit Driving method, for driving above-mentioned gate driving circuit, comprising the following steps:

Input phase, the input module of shift register cell is under the action of input signal, by the voltage of pull-up node It draws high;

Output stage, the output module of the shift register cell export gate driving under the action of clock signal Signal;

Reseting stage, the reseting module of the shift register cell is under the action of reset signal, by pull-up node The output end voltage of voltage and the output module is pulled low to gate off voltage;The drop-down control of the shift register cell Molding block is equal by the output end voltage of the voltage of the pull-up node and the output module under the action of drop-down controls signal It is pulled low to the gate off voltage;

Holding stage, the pull-down control module make the output module under the action of drop-down controls signal Output end voltage is maintained at gate off voltage.

In shift register cell provided by the invention, input module can be in input phase, by the voltage of pull-up node It draws high;Output module can export gate drive signal in output stage;Reseting module can be in reseting stage, by pull-up node Voltage and the output end voltage of output module be pulled low to gate off voltage;Pull-down control module can in reseting stage, The output end voltage of the voltage of pull-up node and output module is pulled low to gate off voltage, and in the stage of holding, drop-down Control module can also make the output end voltage of output module be maintained at gate off voltage.Due in the stage of holding, drop-down control Molding block can make the output end voltage of output module be maintained at gate off voltage, exist to avoid the output of output module Suspended state;Each module in the shift register cell is allowed in this way the disturbed conditions such as to occur leaking electricity during the work time When, the output module in shift register cell will not accidentally be exported because of by coupling crosstalk, enhanced displacement well and posted The anti-interference ability of storage unit.

Detailed description of the invention

The drawings described herein are used to provide a further understanding of the present invention, constitutes a part of the invention, this hair Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:

Fig. 1 is the structural schematic diagram of shift register cell provided in an embodiment of the present invention;

Fig. 2 is the working timing figure of shift register cell provided in an embodiment of the present invention;

Fig. 3 is the structural schematic diagram of gate driving circuit provided in an embodiment of the present invention.

Appended drawing reference:

1- input module, 2- output module,

3- reseting module, 4- pull-down control module,

M1- first switch tube, M2- second switch,

M3- third switching tube, the 4th switching tube of M4-,

The 5th switching tube of M5-, the 6th switching tube of M6-,

The 7th switching tube of M7-, the 8th switching tube of M8-,

The 9th switching tube of M9-, PU- pull-up node,

PD- pull-down node, Input- input signal,

Output- gate drive signal, VGH- drop-down control signal,

CLK- clock signal, the first clock signal of CLK1-,

CLK2- second clock signal, Reset- reset signal,

STV frame start signal, VGL- gate off voltage,

C1- first capacitor, the second capacitor of C2-,

T1- input phase, t2- output stage,

T3- reseting stage, t4- are kept for the stage.

Specific embodiment

Shift register cell, gate driving circuit and its driving side that embodiment provides in order to further illustrate the present invention Method is described in detail with reference to the accompanying drawings of the specification.

Fig. 1 and Fig. 2 are please referred to, a duty cycle of shift register cell provided in an embodiment of the present invention includes: defeated Enter stage t1, output stage t2, reseting stage t3 and keep stage t4, shift register cell includes: input module 1, output Module 2, reseting module 3 and pull-down control module 4;Wherein input module 1 is in input phase t1, in input signal Input Under the action of by the voltage high of pull-up node PU;Output module 2 is in output stage t2, for the effect in clock signal clk Lower output gate drive signal Output;Reseting module 3 is used under the action of reset signal Reset in reseting stage t3, will The voltage of pull-up node PU and the output end voltage of output module 2 are pulled low to gate off voltage VGL;Pull-down control module 4 In reseting stage t3, under the action of drop-down controls signal VGH, by the defeated of the voltage of pull-up node PU and output module 2 Outlet voltage is pulled low to gate off voltage VGL;And pull-down control module 4 is keeping stage t4, for being controlled in drop-down The output end voltage of output module 2 is set to be maintained at gate off voltage VGL under the action of signal VGH.

Specific work process of the above-mentioned shift register cell within a duty cycle are as follows: in input phase t1, displacement The input module 1 of register cell is under the action of input signal Input by the voltage high of pull-up node PU;In output stage T2, the output module 2 of shift register cell export gate drive signal Output under the action of clock signal clk;Multiple Position stage t3, the reseting module 3 of shift register cell is under the action of reset signal Reset, by the voltage of pull-up node PU Gate off voltage VGL is pulled low to the output end voltage of output module 2;And in reseting stage t3, shift register list The pull-down control module 4 of member, equally can be by the voltage and output module of pull-up node PU under the action of drop-down controls signal VGH 2 output end voltage is pulled low to gate off voltage VGL;Stage t4 is being kept, the drop-down of shift register cell controls mould Block 4 makes the output end voltage of output module 2 be maintained at gate off voltage VGL under the action of drop-down controls signal VGH.

In conjunction with shift register cell provided by the above embodiment structure and specific work process it is found that the present invention implement In the shift register cell that example provides, input module 1 can be in input phase t1 by the voltage high of pull-up node PU;Output Module 2 can export gate drive signal Output in output stage t2;Reseting module 3 can will be pulled up in reseting stage t3 The voltage of node PU and the output end voltage of output module 2 are pulled low to gate off voltage VGL;Pull-down control module 4 can In reseting stage t3, the output end voltage of the voltage of pull-up node PU and output module 2 is pulled low to gate off voltage VGL, and stage t4 is being kept, pull-down control module 4 can also make the output end voltage of output module 2 be maintained at gate turn-off electricity Press VGL.Due to keeping stage t4, pull-down control module 4 can make the output end voltage of output module 2 be maintained at gate turn-off Voltage VGL, to avoid output module 2 output in suspended state;It is allowed in this way when each in shift register cell Module occur leaking electricity during the work time etc. disturbed conditions when, output module 2 in shift register cell will not because of by Coupling crosstalk and accidentally export, that is, ensure that the grid line in array substrate will not open by mistake opens, and enhances shift register list well The anti-interference ability of member.

Input module 1, output module please continue to refer to Fig. 1, in shift register cell provided by above-described embodiment 2, reseting module 3 and the specific structure of pull-down control module 4 are varied, and a kind of corresponding specific knot of each module is given below Structure, with the course of work and beneficial effect progress detailed analysis to shift register cell;Certainly, modules be not limited only to Specific structure out.

Input module 1 includes first switch tube M1, the control terminal of first switch tube M1 and the input terminal of first switch tube M1 Input signal Input is received, the output end of first switch tube M1 is connect with pull-up node PU.In input phase t1, input letter Number Input control first switch tube M1 conducting, is realized after first switch tube M1 conducting by the voltage high of pull-up node PU.

Output module 2 includes second switch M2, and the control terminal of second switch M2 is connect with pull-up node PU, and second opens The input terminal for closing pipe M2 receives clock signal clk, and the output end (output end of output module 2) of second switch M2 exports grid Driving signal Output.In output stage t2, the voltage signal control second switch M2 conducting of pull-up node PU, second switch After pipe M2 conducting under the action of clock signal clk, the output end of second switch M2 exports gate drive signal Output.

Reseting module 3 includes third switching tube M3 and the 4th switching tube M4;Wherein the control terminal of third switching tube M3 receives The input terminal of reset signal Reset, third switching tube M3 are connect with pull-up node PU, the output end of third switching tube M3 be used for The signal wire connection of gate off voltage VGL is provided;The control terminal of 4th switching tube M4 receives reset signal Reset, and the 4th opens Close pipe M4 input terminal connect with the output end of output module 2, the output end of the 4th switching tube M4 and be used for gate turn-off is provided The signal wire of voltage VGL connects.Third switching tube M3 and the 4th switching tube M4 is controlled in reseting stage t3, reset signal Reset It is both turned on, after third switching tube M3 conducting pull-up node PU is connected to the signal wire for providing gate off voltage VGL, thus By the voltage pull-down of pull-up node PU to gate off voltage VGL;Make the output of output module 2 after 4th switching tube M4 conducting It holds and is connected to the signal wire for providing gate off voltage VGL, so that the output end voltage of output module 2 is pulled low to gate turn-off The gate drive signal Output that output module 2 exports (is reset to gate off voltage VGL) by voltage VGL.

Pull-down control module 4 include the 5th switching tube M5, the 6th switching tube M6, the 7th switching tube M7, the 8th switching tube M8, 9th switching tube M9 and first capacitor C1;Wherein, the control terminal of the 5th switching tube M5 and the input terminal of the 5th switching tube M5 are equal The output end for receiving drop-down control signal VGH, the 5th switching tube M5 connects the control terminal of the 6th switching tube M6, and the 5th switching tube The output end of M5 connects the input terminal of the 6th switching tube M6;The output end of 6th switching tube M6 connects pull-down node PD;7th opens The control terminal for closing pipe M7 connects pull-up node PU, and the input terminal of the 7th switching tube M7 connects pull-down node PD, the 7th switching tube M7 Output end connect with the signal wire for providing gate off voltage VGL;The control terminal and pull-down node of 8th switching tube M8 PD connection, the input terminal of the 8th switching tube M8 are connect with pull-up node PU, the output end of the 8th switching tube M8 with for providing grid Pole turns off the signal wire connection of voltage VGL;The control terminal of 9th switching tube M9 is connect with pull-down node PD, the 9th switching tube M9's Input terminal is connect with the output end of output module 2, the output end of the 9th switching tube M9 with for providing gate off voltage VGL's Signal wire connection;One end of first capacitor C1 connects pull-down node PD, and the other end of first capacitor C1 is closed with for providing grid The signal wire connection of power-off pressure VGL.

Please continue to refer to Fig. 1 and Fig. 2, below with reference to the specific structure of pull-down control module 4 to its course of work and generation Beneficial effect carry out detailed analysis.

The 5th switching tube M5 conducting is controlled, is made after the 5th switching tube M5 conducting in reseting stage t3, drop-down control signal VGH Drop-down control signal VGH can be received by the 5th switching tube M5 by obtaining the 6th switching tube M6, so that drop-down controls signal VGH Control the 6th switching tube M6 conducting;And the voltage that the 6th switching tube M6 conducting allows for pull-down node PD is controlled signal by drop-down VGH control, i.e. drop-down control signal VGH can control the electricity of pull-down node PD by the 5th switching tube M5 and the 6th switching tube M6 It presses, while pulling down control signal VGH to fill first capacitor C1 by the 5th switching tube M5 and the 6th switching tube M6 Electricity.And when the voltage value of pull-down node PD is in high level, it will be able to control the 8th switching tube M8 and the 9th switching tube M9 is same When be connected, wherein the 8th switching tube M8 conducting can be by the voltage pull-down of pull-up node PU to gate off voltage VGL, the 9th switch The output end voltage of output module 2 can be pulled low to gate off voltage VGL by pipe M9 conducting.Specified otherwise is needed, due to It is reset to gate off voltage VGL in the voltage of reseting stage t3 pull-up node PU, is allowed at the 7th switching tube M7 in this way In off state, therefore, will not be discharged by the 7th switching tube M7 in reseting stage t3 first capacitor C1, and pull-down node PD Voltage will not be dragged down by the 7th switching tube M7.In addition, the connection type structure of above-mentioned 5th switching tube M5 and the 6th switching tube M6 At a kind of current source structure, when drop-down control signal VGH is fluctuated, this current source structure can stablize pull-down node The voltage of PD avoids the voltage of pull-down node PD from being influenced by drop-down control signal VGH fluctuation.

Stage t4 is being kept, when drop-down control signal VGH is still within high level, the switch of the 5th switching tube M5 and the 6th Pipe M6 can be still within the state of conducting, i.e., so that the voltage of pull-down node PD maintains high level, and pull down control signal VGH It is charged simultaneously by the 5th switching tube M5 and the 6th switching tube M6 to first capacitor C1, so that the electricity of pull-up node PU The output end voltage of pressure value and output module 2 is always held at gate off voltage VGL;And before the arrival of next frame signal, Drop-down control signal VGH will appear low level situation, and such 5th switching tube M5 and the 6th switching tube M6 will be in cut-off State can be continued the voltage for keeping pull-down node PD, so that the 8th switching tube M8 in this case by first capacitor C1 It is still within the state of conducting with the 9th switching tube M9, that is, ensure that the voltage of pull-up node PU and the output end of output module 2 Voltage is pulled low to gate off voltage VGL, avoids output module 2 well and the problem of accidentally exporting occurs.

In more detail, shift register cell is influenced during real work by high-temperature work environment, respectively Switching tube used in module will appear the case where electric leakage, and the feelings leaked electricity occurs in the second switch M2 in output module 2 When condition, it is possible to cause second switch M2 to open by mistake and open, is accidentally exported so as to cause output module 2, and the embodiment of the present invention is mentioned In the shift register cell of confession, introduced pull-down module is in reseting stage t3 and keeps stage t4 can be by pull-up node PU Voltage and the output end voltage of output module 2 be pulled low to gate off voltage VGL, avoid shift register list well The mistake of member exports problem, ensure that shift register cell steady-working state in a high temperauture environment, improves shift LD The reliability of device unit.

Due to gate drive signal Output one grid line of corresponding driving of each shift register cell output, in this way The stability of the gate drive signal Output exported just determines the write-in display number of pixel unit corresponding to this grid line According to when stability, and in order to guarantee shift register cell output gate drive signal Output stability, Ke Yi Introduce the second capacitor C2 in shift register cell, and one end of the second introduced capacitor C2 connects pull-up node PU, second The other end of capacitor C2 is connect with the signal wire for providing gate off voltage VGL;In this way in input phase t1, in input mould While block 1 is by the voltage high of pull-up node PU, also charge to the second capacitor C2;And in the second capacitor of output stage t2 It is high level that C2, which can not only keep the voltage of pull-up node PU, also has the function of stablizing pull-up node PU voltage;Due to upper The voltage stabilization for drawing node PU allows for the output module 2 (second switch M2) controlled by the voltage signal of pull-up node PU With stable working condition, the gate drive signal Output exported by output module 2 is allowed in this way with stable wave Shape, so that the work that the transistor in the array substrate driven by gate drive signal Output can be stable, ensure that Display data can be good at being written in pixel unit.

According to the specific structure of shift register cell provided by the above embodiment it is found that being adopted in shift register cell The negligible amounts of device (switching tube and capacitor), its corresponding occupied space is smaller, is avoiding shift LD in this way While device unit accidentally exports, the narrow frame design of display device is also helped.

For the clearer course of work for illustrating shift register cell, specific embodiment is given below.

Embodiment one:

In input phase t1, input signal Input is high level, and clock signal clk is low level, reset signal Reset For low level, drop-down control signal VGH is high level;Input signal Input controls first switch tube M1 conducting, thus will pull-up The voltage high of node PU, while first switch tube M1 conducting is also charged for the second capacitor C2;And the voltage quilt of pull-up node PU It draws high, the voltage signal for allowing for pull-up node PU can control second switch M2 and the 7th switching tube M7 is both turned on, but by It is in low level in clock signal clk, therefore second switch M2 has no output, and meeting is connected so that first in the 7th switching tube M7 Capacitor C1 electric discharge, i.e., so that the voltage of pull-down node PD is low level, so that the 8th switching tube M8 and the 9th switching tube M9 It is turned off;And reset signal Reset is low level, i.e., so that third switching tube M3 and the 4th switching tube M4 are in cut-off shape State is in normal output state by shift register cell (i.e. third switching tube M3 and the 4th switching tube M4 is not to ensure that Meeting drags down effect to the voltage generation of the voltage and second switch M2 output end of pull-up node PU).Specified otherwise is needed, In input phase t1, even if drop-down control signal VGH can control the 5th switching tube M5 and the 6th switching tube M6 is both turned on, will under The voltage high of node PD is drawn, the 7th switching tube M7 that the voltage of pull-down node PD still can be switched on is down for gate turn-off electricity VGL is pressed, and first capacitor C1 can also be discharged by the 7th switching tube M7 of conducting, therefore the 8th switching tube M8 and the 9th Switching tube M9 is not turned in input phase t1.

In output stage t2, input signal Input is low level, and clock signal clk is high level, reset signal Reset For low level, drop-down control signal VGH is high level;Since input signal Input is that low level allows for first switch tube M1 Cut-off, i.e. input module 1 no longer charge no longer by the voltage high of pull-up node PU for the second capacitor C2;But due to second The holding of capacitor C2 acts on, and the voltage of pull-up node PU can be made to be continuously maintained at high level, the voltage of such pull-up node PU Continue to control second switch M2 conducting, and since clock signal clk is high level, allow for the output end of second switch M2 Export gate drive signal Output (i.e. output module 2 exports high level);In addition, can according to the analysis of above-mentioned input phase t1 Know, the working condition of third switching tube M3 to the 9th switching tube M9 is identical as the working condition of above-mentioned input phase t1.

In reseting stage t3, input signal Input is low level, and clock signal clk is low level, reset signal Reset For high level, drop-down control signal VGH is high level;Since input signal Input is that low level ends first switch tube M1, And reset signal Reset is high level, allows for third switching tube M3 and the 4th switching tube M4 and is in the state of conducting, third Switching tube M3 conducting can be by the voltage pull-down of pull-up node PU to gate off voltage VGL, and the 4th switching tube M4 conducting can be by the The output end voltage of two switching tube M2 is pulled low to gate off voltage VGL, is controlled in this way by the voltage signal of pull-up node PU Second switch M2 cut-off;And the voltage of pull-up node PU is pulled low, and the 7th switching tube M7 can also ended, and is controlled in this way in drop-down Under the action of signal VGH processed, the 5th switching tube M5 and the 6th switching tube M6 are both turned on, so that the voltage quilt of pull-down node PD It draws high, while charging to first capacitor C1;After the voltage of pull-down node PD is raised, by the voltage signal of pull-down node PD The 8th switching tube M8 and the 9th switching tube M9 of control are both turned on, to further realize the voltage of pull-up node PU and second The output end voltage of switching tube M2 is pulled low to gate off voltage VGL.

Stage t4, input signal Input is being kept to be low level, reset signal Reset is low level, due to input signal Input is that low level ends first switch tube M1;And the voltage of pull-up node PU be low level so that second switch M2 and 7th switching tube M7 is turned off;Reset signal Reset is that low level is turned off third switching tube M3 and the 4th switching tube M4, i.e., Third switching tube M3 does not drag down effect, and output of the 4th switching tube M4 to second switch M2 to the voltage of pull-up node PU The voltage at end does not drag down effect;Since the 7th switching tube M7 ends, under the action of drop-down controls signal VGH, pull-down node The voltage of PD can be raised, and first capacitor C1 can be electrically charged simultaneously, and the 8th controlled by the voltage signal of pull-down node PD opens It closes pipe M8 and the 9th switching tube M9 to be both turned on, to realize dragging down to the voltage of pull-up node PU, and to second switch M2 The voltage of output end drag down, that is, ensure that second switch M2 does not have the case where accidentally exporting;And two frame signals it Between, drop-down control signal VGH will appear low level, when drop-down control signal VGH there is low level when, can by first capacitor C1 after The continuous voltage for maintaining pull-down node PD, so that the 8th switching tube M8 and the 9th switching tube M9 are still within the state of conducting, to protect Card shift register cell before the arrival of next frame signal is not in the problem of accidentally output.

Specified otherwise is needed, the first switch tube M1 to the 9th switching tube M9 being previously mentioned in above-described embodiment can be selected Type it is varied, such as: P-type transistor, N-type transistor;And it is different according to selected switching tube type, it can be corresponding The suitable control signal of selection come the conducting and cut-off of control switch pipe.In addition, only will be apparent to above-mentioned shift register cell Basic principle, it will be able to easily by shift register cell provided in an embodiment of the present invention be changed to using other have can The circuit that the device of on-off action is constituted is controlled, but which kind of device no matter to realize the driving function of shift register cell using, Substantive variation cannot be all brought, therefore, no matter which kind of device is used, as long as the displacement provided according to embodiments of the present invention is posted The basic principle of storage unit shows driving function in fact, should all be in the protection scope of this patent.

The embodiment of the invention also provides a kind of gate driving circuit, including m above-mentioned shift register cells, wherein m For the integer more than or equal to 1.Specifically, m shift register cell can be divided into several groups, every group of shift register cell packet At least two cascade shift register cells are included, this structure is of course not solely limited to.

Introduced shift register cell is keeping stage t4,4 energy of pull-down control module in this gate driving circuit So that the output end voltage of output module 2 is maintained at gate off voltage VGL, is being hanged to avoid the output of output module 2 Floating state;To ensure that when the disturbed conditions such as occurs leaking electricity during the work time in each module in shift register cell, Output module 2 in shift register cell will not accidentally be exported because of by coupling crosstalk, enhance gate driving well The anti-interference ability of circuit improves the reliability of shift register cell.

Shift register cell in above-mentioned gate driving circuit further includes that one end of the second capacitor C2, the second capacitor C2 connects Pull-up node PU is met, the other end of the second capacitor C2 is connect with the signal wire for providing gate off voltage VGL.In input mould While block 1 is by the voltage high of pull-up node PU, also charge to the second capacitor C2;And in the second capacitor of output stage t2 It is high level that C2, which can not only keep the voltage of pull-up node PU, also has the function of stablizing pull-up node PU voltage;Due to upper The voltage stabilization for drawing node PU allows for having stable work by the output module 2 that the voltage signal of pull-up node PU controls State allows for the gate drive signal Output exported by output module 2 with stable waveform, so that by grid in this way Pole driving signal Output driving array substrate on transistor can be stable work, ensure that display data can be fine Be written in pixel unit;Therefore after introducing the second capacitor C2 in shift register cell included by gate driving circuit, Display data just can be good at being written in the pixel unit of whole display device.

Referring to Fig. 3, shift register cell included in above-mentioned gate driving circuit is there are a variety of cascade systems, with Under provide a kind of specific cascade system, and the course of work and beneficial effect of gate driving circuit are described in detail, when So it is not limited only to this cascade system provided.

In the m shift register cells, the gate drive signal Output of n-th grade of shift register cell output Input signal Input as (n+1)th grade of shift register cell;The gate drive signal of (n+1)th grade of shift register cell Reset signal Reset of the Output as n-th grade of shift register cell;Wherein n is the integer more than or equal to 1, and n is less than m; As n=1, the input signal Input of n-th grade of shift register cell is provided by frame start signal line.

GOA1 in Fig. 3 is first order shift register cell, and GOA2 is second level shift register cell;GOA1 and GOA2 is connected respectively the first clock cable and second clock signal wire, i.e., corresponding to receive the first clock signal clk 1 and the Two clock signal clks 2;GOA1 and GOA2 is all connected with the same drop-down control signal wire, that is, receives and control from the same drop-down The drop-down of signal wire controls signal VGH;GOA1 and GOA2 is all connected with same for providing the signal of gate off voltage VGL Line.

The input terminal of input module 1 connects frame start signal line in GOA1, i.e., is originated by the frame that frame start signal line provides Input signal Input of the signal STV as GOA1;The output end of the output module 2 of GOA1 connects corresponding grid line, and same When connection GOA2 input module 1 input terminal, i.e. the output module 2 of GOA1 is that corresponding grid line provides gate driving and believes Number Output, while input signal Input is provided for the input module 1 of GOA2;The output module 2 of GOA2 output end connection with Its corresponding grid line, and the input terminal of the input module 1 of next stage shift register cell is connected simultaneously, and connects GOA1 simultaneously Reseting module 3, i.e. the output module 2 of GOA2 provides gate drive signal Output for corresponding grid line, while under being The input module 1 of level-one shift register cell provides input signal Input, and provides again for the reseting module 3 of GOA1 simultaneously Position signal Reset;Reset signal Reset needed for GOA2 is provided by the output module 2 of next stage shift register cell.

The specific work process of GOA1 combination GOA2 is given below, GOA1 in input phase t1, input module 1 it is defeated Enter end and receive frame start signal STV, the voltage of pull-up node PU under the action of frame start signal STV in GOA1 is raised. In output stage t2, the output module 2 of GOA1 exports gate drive signal under the action of the first clock signal clk 1 Output, and input signal Input is provided simultaneously for GOA2;In reseting stage t3, the reseting module 3 of GOA1 is mentioned by GOA2 Under the action of the reset signal Reset of confession, by the voltage pull-down of pull-up node PU to gate off voltage VGL, and mould will be exported The output end voltage of block 2 is pulled low to gate off voltage VGL;Work of the pull-down control module 4 of GOA1 in drop-down control signal VGH Under, it is pulled low to by the voltage pull-down of pull-up node PU to gate off voltage VGL, and by the output end voltage of output module 2 Gate off voltage VGL;When keeping stage t4, the pull-down control module 4 of GOA1 under the action of drop-down controls signal VGH, The output end voltage of output module 2 is set to be maintained at gate off voltage VGL.

Specified otherwise is needed, according to the analysis of the above-mentioned course of work to GOA1 and above-mentioned to GOA1 and GOA2 Connection relationship, can similarly obtain the course of work of GOA2, not elaborate herein.

The embodiment of the present invention also provides a kind of driving method of gate driving circuit, for driving above-mentioned gate driving electricity Road, driving method the following steps are included:

Input phase t1, the input module 1 of shift register cell save pull-up under the action of input signal Input The voltage high of point PU.

Output stage t2, under the action of clock signal clk, output grid drives the output module 2 of shift register cell Dynamic signal Output.

Reseting stage t3, the reseting module 3 of shift register cell save pull-up under the action of reset signal Reset The voltage of point PU and the output end voltage of output module 2 are pulled low to gate off voltage VGL;The drop-down of shift register cell Control module 4 is under the action of drop-down controls signal VGH, by the output end voltage of the voltage of pull-up node PU and output module 2 It is pulled low to gate off voltage VGL.

Holding stage t4, pull-down control module 4 make the output end of output module 2 under the action of drop-down controls signal VGH Voltage is maintained at gate off voltage VGL.

Above-mentioned gate driving circuit is driven by the driving method of this gate driving circuit, is being kept stage t4, is being moved Pull-down control module 4 in bit register unit can make the output end voltage of output module 2 be maintained at gate off voltage VGL, to avoid output module 2 output in suspended state;To ensure that when each module in shift register cell Occur leaking electricity during the work time etc. disturbed conditions when, output module 2 in shift register cell will not be because of being coupled Crosstalk and accidentally export, enhance the anti-interference ability of entire gate driving circuit well.

Shift register cell in gate driving circuit further includes in one end connection of the second capacitor C2, the second capacitor C2 Node PU is drawn, the other end of the second capacitor C2 is connect with the signal wire for providing gate off voltage VGL;In input phase T1, input module 1 charge to the second capacitor C2 under the action of input signal Input;In output stage t2, the second electricity Holding C2 makes the voltage of pull-up node PU be maintained at high level.

All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for method reality For applying example, since it is substantially similar to product embodiments, so describing fairly simple, related place is referring to product embodiments Part explanation.

In the description of above embodiment, particular features, structures, materials, or characteristics can be at any one or more It can be combined in any suitable manner in a embodiment or example.

The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.

Claims (10)

1. a kind of shift register cell, which is characterized in that a duty cycle of the shift register cell includes: input Stage, output stage, reseting stage and holding stage, the shift register cell include:
Input module, in the input phase, the input module is used under the action of input signal, by the electricity of pull-up node Pressure is drawn high;
Output module, in the output stage, the output module is used under the action of clock signal, output gate driving letter Number;
Reseting module, in the reseting stage, the reseting module is used under the action of reset signal, by the pull-up node Voltage and the output end voltage of the output module be pulled low to gate off voltage;
Pull-down control module, in the reseting stage, the pull-down control module is used under the action of drop-down controls signal, will The output end voltage of the voltage of the pull-up node and the output module is pulled low to the gate off voltage;In the guarantor It holds the stage, the pull-down control module is used to make the output end of the output module under the action of drop-down controls signal Voltage is maintained at the gate off voltage;
The pull-down control module includes the 5th switching tube, the 6th switching tube, the 7th switching tube, the 8th switching tube, the 9th switch Pipe and first capacitor;Wherein,
The control terminal of 5th switching tube and the input terminal of the 5th switching tube receive the drop-down control signal, described The output end of 5th switching tube connects the control terminal of the 6th switching tube, and described in the output end connection of the 5th switching tube The input terminal of 6th switching tube;The output end of 6th switching tube connects pull-down node;
The control terminal of 7th switching tube connects the pull-up node, and the input terminal of the 7th switching tube connects the drop-down The output end of node, the 7th switching tube is connect with the signal wire for being used to provide the described gate off voltage;
The control terminal of 8th switching tube is connect with the pull-down node, the input terminal of the 8th switching tube and the pull-up Node connection, the output end of the 8th switching tube are connect with the signal wire for being used to provide the described gate off voltage;
The control terminal of 9th switching tube is connect with the pull-down node, the input terminal of the 9th switching tube and the output The output end of module connects, and the output end of the 9th switching tube connects with the signal wire for being used to provide the described gate off voltage It connects;
One end of the first capacitor connects the pull-down node, the other end of the first capacitor and is used to provide the described grid Turn off the signal wire connection of voltage.
2. shift register cell according to claim 1, which is characterized in that the input module includes first switch Pipe, the input terminal of the control terminal of the first switch tube and the first switch tube receive the input signal, and described first The output end of switching tube is connect with the pull-up node.
3. shift register cell according to claim 1, which is characterized in that the output module includes second switch Pipe, the control terminal of the second switch are connect with the pull-up node, when the input terminal of the second switch receives described The output end of clock signal, the second switch exports the gate drive signal.
4. shift register cell according to claim 1, which is characterized in that the reseting module includes third switching tube With the 4th switching tube;Wherein,
The control terminal of the third switching tube receives the reset signal, and the input terminal of the third switching tube and the pull-up save Point connection, the output end of the third switching tube are connect with the signal wire for being used to provide the described gate off voltage;
The control terminal of 4th switching tube receives the reset signal, the input terminal and the output mould of the 4th switching tube The output end of block connects, and the output end of the 4th switching tube is connect with the signal wire for being used to provide the described gate off voltage.
5. shift register cell according to claim 1, which is characterized in that the shift register cell further includes Two capacitors, one end of second capacitor connect the pull-up node, the other end of second capacitor be used to provide the described The signal wire of gate off voltage connects.
6. a kind of gate driving circuit, which is characterized in that including m such as shift LD of any of claims 1-4 Device unit, wherein m is the integer more than or equal to 1.
7. gate driving circuit according to claim 6, which is characterized in that the shift register cell further includes second Capacitor, one end of second capacitor connect the pull-up node, the other end of second capacitor and are used to provide the described grid Pole turns off the signal wire connection of voltage.
8. gate driving circuit according to claim 6 or 7, which is characterized in that in the m shift register cells In, the gate drive signal of n-th grade of shift register cell output is defeated as (n+1)th grade of shift register cell Enter signal;The gate drive signal of (n+1)th grade of shift register cell is answered as n-th grade of shift register cell Position signal;Wherein n is the integer more than or equal to 1;
As n=1, the input signal of n-th grade of shift register cell is provided by frame start signal line.
9. a kind of driving method of gate driving circuit, which is characterized in that for driving gate driving as claimed in claim 6 Circuit, comprising the following steps:
Input phase, the input module of shift register cell is under the action of input signal, by the voltage high of pull-up node;
Output stage, the output module of the shift register cell export gate drive signal under the action of clock signal;
Reseting stage, the reseting module of the shift register cell is under the action of reset signal, by the voltage of pull-up node Gate off voltage is pulled low to the output end voltage of the output module;The drop-down of the shift register cell controls mould Block drags down the output end voltage of the voltage of the pull-up node and the output module under the action of drop-down controls signal To the gate off voltage;
Holding stage, the pull-down control module make the output of the output module under the action of drop-down controls signal End voltage is maintained at gate off voltage.
10. the driving method of gate driving circuit according to claim 9, which is characterized in that the gate driving circuit In shift register cell further include the second capacitor, one end of second capacitor connects the pull-up node, described second The other end of capacitor is connect with the signal wire for being used to provide the described gate off voltage;
In the input phase, the input module charges to second capacitor under the action of input signal;
In the output stage, second capacitor makes the voltage of the pull-up node be maintained at high level.
CN201610304697.0A 2016-05-09 2016-05-09 A kind of shift register cell, gate driving circuit and its driving method CN105741742B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610304697.0A CN105741742B (en) 2016-05-09 2016-05-09 A kind of shift register cell, gate driving circuit and its driving method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610304697.0A CN105741742B (en) 2016-05-09 2016-05-09 A kind of shift register cell, gate driving circuit and its driving method

Publications (2)

Publication Number Publication Date
CN105741742A CN105741742A (en) 2016-07-06
CN105741742B true CN105741742B (en) 2019-05-14

Family

ID=56288849

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610304697.0A CN105741742B (en) 2016-05-09 2016-05-09 A kind of shift register cell, gate driving circuit and its driving method

Country Status (1)

Country Link
CN (1) CN105741742B (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180049374A (en) * 2016-10-31 2018-05-11 엘지디스플레이 주식회사 Gate driving circuit and display device having in-cell touch sensor using the same
CN106356018B (en) * 2016-11-11 2020-01-14 京东方科技集团股份有限公司 Shift register unit, shift register and display device
CN106710507B (en) * 2017-02-17 2020-03-06 合肥京东方光电科技有限公司 Gate driving circuit, gate driving method and display device
CN106710564A (en) * 2017-03-22 2017-05-24 京东方科技集团股份有限公司 Shifting register unit, shifting register circuit and driving method thereof and display panel
CN107452349B (en) * 2017-08-15 2020-02-21 昆山龙腾光电股份有限公司 Drive circuit and liquid crystal display device
CN109427275A (en) * 2017-08-28 2019-03-05 京东方科技集团股份有限公司 Shift register cell, gate driving circuit and driving method
CN107705743A (en) * 2017-09-28 2018-02-16 京东方科技集团股份有限公司 Shift register cell and its driving method, array base palte and display device
CN108010495B (en) * 2017-11-17 2019-12-13 武汉华星光电技术有限公司 GOA circuit
CN107731195B (en) * 2017-11-22 2019-10-11 武汉华星光电技术有限公司 A kind of NMOS type GOA circuit and display panel
CN107958656B (en) * 2018-01-08 2019-07-02 武汉华星光电技术有限公司 GOA circuit
CN108389539B (en) * 2018-03-15 2020-06-16 京东方科技集团股份有限公司 Shifting register unit, driving method, grid driving circuit and display device
CN109064981B (en) * 2018-07-20 2019-09-17 深圳市华星光电技术有限公司 GOA circuit and display panel and display device including it
CN109935200A (en) * 2018-07-27 2019-06-25 京东方科技集团股份有限公司 Shift register cell, gate driving circuit, display device and driving method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102012591B (en) * 2009-09-04 2012-05-30 北京京东方光电科技有限公司 Shift register unit and liquid crystal display gate drive device
CN103366704B (en) * 2013-07-10 2015-08-19 京东方科技集团股份有限公司 A kind of shift register cell and gate driver circuit, display device
CN104700803B (en) * 2015-03-26 2017-02-22 京东方科技集团股份有限公司 Shifting register, grid drive circuit, display panel and display device
CN104732945B (en) * 2015-04-09 2017-06-30 京东方科技集团股份有限公司 Shift register and driving method, array substrate gate drive device, display panel
CN105047228B (en) * 2015-09-09 2018-11-23 京东方科技集团股份有限公司 A kind of shift register and its driving method, driving circuit and display device
CN105427799B (en) * 2016-01-05 2018-03-06 京东方科技集团股份有限公司 Shifting deposit unit, shift register, gate driving circuit and display device

Also Published As

Publication number Publication date
CN105741742A (en) 2016-07-06

Similar Documents

Publication Publication Date Title
CN104036738B (en) A kind of shift register cell, gate driver circuit and display unit
CN104700803B (en) Shifting register, grid drive circuit, display panel and display device
CN104167166B (en) The driving method of shift registor and shift registor
CN104766580B (en) Shift register cell and driving method, gate driving circuit and display device
CN104835450B (en) Shift register unit, control method therefor, grid drive circuit, and display device
CN103426414B (en) Shift register cell and driving method, gate driver circuit and display device
CN104282287B (en) A kind of GOA unit and driving method, GOA circuit and display device
CN104575420B (en) Scan driving circuit
CN104537970B (en) Drive element of the grid, gate driver circuit and driving method, display device
CN203773916U (en) Shift register unit, shift register and display device
CN104134416B (en) Gate shift register and the display device using which
CN103345941B (en) Shift register cell and driving method, shift-register circuit and display device
CN103928009B (en) Grid electrode driver for narrow frame liquid crystal display
CN103440839B (en) Shifting deposit unit, shift register and display device
CN106128347B (en) Shift register cell and its driving method, gate driving circuit, display device
CN103996370B (en) Shifting register unit, grid drive circuit, display device and drive method
CN104616617B (en) Shifting register and drive method thereof as well as grid drive circuit and display device
CN103996367B (en) Shifting register, gate drive circuit and display device
CN103280200B (en) Shift register unit, gate drive circuit and display device
CN103035298B (en) Shift register unit, grid driving circuit and display device
CN104299583B (en) A kind of shift register and driving method, drive circuit and display device
CN102708779B (en) Shift register and driving device thereof, grid driving device and display device
CN103761937B (en) Shifting register unit, gate driving circuit, driving method of gate driving circuit and display device
CN103714792B (en) A kind of shift register cell, gate driver circuit and display device
CN104252851B (en) Shift register

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
GR01 Patent grant