WO2014166251A1 - 移位寄存器单元及栅极驱动电路 - Google Patents
移位寄存器单元及栅极驱动电路 Download PDFInfo
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- WO2014166251A1 WO2014166251A1 PCT/CN2013/086888 CN2013086888W WO2014166251A1 WO 2014166251 A1 WO2014166251 A1 WO 2014166251A1 CN 2013086888 W CN2013086888 W CN 2013086888W WO 2014166251 A1 WO2014166251 A1 WO 2014166251A1
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- Prior art keywords
- node
- thin film
- shift register
- film transistor
- register unit
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C19/00—Digital stores in which the information is moved stepwise, e.g. shift registers
- G11C19/28—Digital stores in which the information is moved stepwise, e.g. shift registers using semiconductor elements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
-
- 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/0286—Details of a shift registers arranged for use in a driving circuit
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/08—Details of timing specific for flat panels, other than clock recovery
Definitions
- the thin film transistor liquid crystal display (TFT-LCD) driver mainly includes a gate driver and a data driver, wherein the gate driver converts the input clock signal to the gate line of the liquid crystal display panel through the shift register unit, and the gate driving circuit It can be formed in the same process as the TFT and simultaneously formed on the LCD panel together with the TFT.
- the gate driving circuit includes a shift register unit having a plurality of stages, each stage being connected to a corresponding gate line to output a gate driving signal.
- the stages of the gate driving circuit are connected to each other, the start signal is input to the first stage in each stage and the gate driving signal is sequentially output to the gate line, wherein the input end of the front stage is connected to the output end of the upper stage And the output of the next stage is connected to the control end of the previous stage.
- a gate drive circuit of the above structure is disposed on the LCD panel, and each stage of the shift register unit includes the structure shown in FIG.
- the shift register unit shown in Fig. 1 includes ten thin film transistors M1-M10 and one capacitor C1 for implementing the output and reset functions of the shift register unit.
- changes in the AC clock signals in the gate drive circuit may cause interference noise in the circuit, affecting the output of the signal and the stability of the shift register unit; at the same time, more thin film transistors require a larger wiring space, The size of the entire shift register unit is large, which in turn leads to a large volume of the liquid crystal display. Summary of the invention
- an embodiment of the present invention provides a shift register unit and a gate driving circuit for suppressing interference noise caused by a change of an AC clock signal, and adopting a DC pull-down
- the mode can effectively improve the stability of the shift register unit while reducing the size of the shift register unit.
- a shift register unit including: an input module, a reset module, an output module, a pull-down control module, and a pull-down module, where
- the input module is respectively connected to the input signal end, the first voltage signal end, and the output end for responding a signal input to the input signal terminal, providing a first voltage signal input by the first voltage signal terminal to the output terminal;
- the reset module is respectively connected to the reset signal end, the second voltage signal end, and the first node, and is configured to provide a second voltage signal input by the second voltage signal end to the first node in response to the reset signal outputted by the reset signal end.
- the first node is a connection point between the reset module and the input module;
- the output module is respectively connected to the first node, the first clock signal end and the output end, and is configured to provide a first clock signal input by the first clock signal end to the output end in response to the voltage of the first node;
- the module is respectively connected to the first node, the second node, the second clock signal end, the output end and the power supply negative voltage end, and is configured to provide the second clock signal to the second clock signal in response to the second clock signal end input Pulling down a second node of the control module; and supplying a negative power supply voltage input to the negative voltage terminal of the power supply to the second node in response to the voltage of the first node or in response to the voltage of the output terminal, wherein the second node is the pull-down control module a connection point with the pull-down module;
- the pull-down module is respectively connected to the first node, the second node, the power supply negative voltage end and the output end, and is configured to provide the power supply negative voltage input to the first node and the output end of the power supply negative voltage terminal in response to the voltage of the second node .
- a gate driving circuit including a cascaded shift register unit, wherein an input signal end of a first stage shift register unit is connected to a start signal end, and a first stage shift register The reset signal end of the unit is connected to the output end of the second stage shift register unit; the input signal end of the last stage shift register unit is connected to the output end of the shift register unit of the previous stage, and the reset signal of the last stage shift register unit End connection start signal end;
- the input signal terminals of the remaining stages of the shift register unit are connected to the output end of the shift register unit of the previous stage, and the reset signal end is connected to the output of the shift register unit of the next stage.
- a shift register unit and a gate drive circuit includes: an input module, a reset module, an output module, a pull-down control module, and a pull-down module, wherein the input module is connected to the input a signal end, configured to provide a first voltage signal to the output end in response to the input signal; the reset module is connected to the reset signal end, and configured to provide the second voltage signal to the input module as an input module output in response to the reset signal a first node of the terminal; the output module is configured to provide a first clock signal to the output end in response to the voltage of the first node; the pull-down control module is configured to provide the second clock signal to the second clock signal in response to the second node The second section of the pull-down control module a point, configured to provide a negative power supply voltage to the second node in response to the voltage of the first node, and provide a negative power supply voltage to the second node in response to the voltage of the output terminal; the pull-down module is configured
- the shift register unit realizes the signal transmission function and the noise reduction function of the shift register unit by using a smaller number of thin film transistors, and suppresses the component itself.
- the drift of the threshold voltage and the output error caused by the interference of adjacent components further improve the output characteristics of the shift register and the service life of the transistor; meanwhile, since the thin-film transistor used is relatively small, the wiring space is saved, It is advantageous to reduce the size of the shift register unit, so that the volume of the entire liquid crystal display can be reduced.
- 1 is a schematic structural diagram of a shift register unit in the prior art
- FIG. 2 is a schematic structural diagram of a shift register unit according to a first embodiment of the present invention
- FIG. 3 is a schematic structural view of a shift register unit according to a second embodiment of the present invention
- 3 is a schematic structural diagram of a gate driving circuit of a third embodiment
- FIG. 5 is a timing signal diagram of each signal terminal of a shift register unit according to a fourth embodiment of the present invention
- FIG. 6 is a timing signal diagram of a second node in a different gate drive circuit. detailed description
- Embodiments of the present invention provide a shift register unit and a gate driving circuit for suppressing interference noise caused by a change of an AC clock signal, and adopting a DC pull-down mode to effectively improve stability of a shift register unit. Reduce the size of the shift register unit.
- a shift register unit is provided, the structure of which is shown in FIG. 2.
- the shift register unit comprises: an input module 201, a reset module 202, and an output module. 203. Pull down control module 204 and pull down module 205.
- the input module 201 is respectively connected to the input signal terminal INPUT, the first voltage signal terminal VDD, and the output terminal OUTPUT, and is configured to provide the first voltage signal input by the first voltage signal terminal VDD to the output terminal in response to the signal input by the input signal terminal INPUT.
- OUTPUT ;
- the reset module 202 is respectively connected to the reset signal terminal RESET, the second voltage signal terminal VSS, and the first The node PI is configured to provide a second voltage signal input by the second voltage signal terminal VSS to the first node P1 in response to the reset signal outputted by the reset signal terminal RESET, wherein the first node P1 is the reset module 202 and the input module 201. Junction.
- the output module 203 is respectively connected to the first node P1, the first clock signal terminal CK and the output terminal OUTPUT for supplying the first clock signal input by the first clock signal terminal CK to the output terminal OUTPUT in response to the voltage of the first node PI. ;
- the pull-down control module 204 is respectively connected to the first node P1, the second node P2, the second clock signal terminal CKB, the output terminal OUTPUT and the power supply negative voltage terminal VGL for responding to the second clock signal input by the second clock signal terminal CKB.
- the pull-down module 205 is respectively connected to the first node P1, the second node P2, the power supply negative voltage terminal VGL and the output terminal OUTPUT for supplying the power supply negative voltage input by the power supply negative voltage terminal VGL to the first node in response to the voltage of the second node P2.
- the shift register unit as shown in FIG. 2 includes: an input module 201, a reset module 202, an output module 203, a pull-down control module 204, and a pull-down module 205.
- the input module 201 includes:
- the first thin film transistor T1 has a gate connected to the input signal terminal INPUT, a drain connected to the first voltage signal terminal VDD, and a source connected to the first node P1.
- the reset module 202 includes:
- the second thin film transistor T2 has a gate connected to the reset signal terminal RESET, a drain terminal connected to the first node P1, and a source connected to the second voltage signal terminal VSS.
- the output module 203 includes:
- the third thin film transistor T3 has a gate connected to the first node P1, a drain connected to the first clock signal terminal CK, and a source connected to the output terminal OUTPUT;
- the first capacitor C1 has a first end connected to the first node P1 and a second end connected to the output end OUTPUT.
- the pull-down control module 204 includes:
- the fourth thin film transistor T4 has its gate and drain simultaneously connected to the second clock signal terminal CKB, the source Connecting the second node P2;
- a fifth thin film transistor T5 having a gate connected to the first node P1, a source connected to the negative voltage terminal VGL, and a drain connected to the first node P1;
- the sixth thin film transistor T6 has a gate connected to the output terminal OUTPUT, a drain connected to the second node P2, and a source connected to the negative voltage terminal VGL of the power supply.
- the pull down module 205 includes:
- the seventh thin film transistor T7 has a gate connected to the second node P2, a source connected to the negative voltage terminal VGL, and a drain connected to the first node P1;
- the eighth thin film transistor T8 has a gate connected to the second node P2, a drain connected to the output terminal OUTPUT, and a source connected to the negative voltage terminal VGL of the power supply.
- all of the above thin film transistors are N-type thin film transistor TFTs.
- all of the above thin film transistors are either polysilicon thin film transistors or amorphous silicon thin film transistors at the same time.
- the DC pull-low or pull-up method for the first node P1 and the second node P2 is used to suppress the output error caused by the drift of the threshold voltage of the component itself and the interference of adjacent components, thereby solving the problem.
- the problem of excessive noise since the thin-film transistors used in the above shift register unit are small, the wiring space is saved, and the size of the shift register unit is reduced, thereby reducing the overall liquid crystal display. volume.
- a shift register unit having a structure as shown in FIG.
- the shift register unit also includes an input module 201, a reset module 202, an output module 203, a pull-down control module 204, and a pull-down module 205.
- the shift register unit shown in Figure 3 differs from the shift register unit shown in Figure 2 in that:
- the pull-down control module 204 further includes a second capacitor C2 connected between the second node P2 and the power supply negative voltage terminal VGL for outputting at the output terminal OUTPUT.
- the shift register unit shown in FIG. 2 can maintain a high potential by the parasitic capacitance of the thin film transistor, but, due to the fifth thin film transistor T5 and the sixth thin film transistor T6, The presence of leakage current causes the second node P2 to discharge, thereby generating noise, which has a certain influence on the output of the signal.
- the second capacitor C2 is set in the circuit, since C1 can maintain a high potential after the output OUTPUT output, Therefore, the presence of the second capacitor C2 can greatly reduce the noise of the second node P2.
- a gate driving circuit including cascaded shift registers a unit, wherein an input signal end of the first stage shift register unit is connected to the start signal end, and a reset signal end of the first stage shift register unit is connected to the output end of the second stage shift register unit; The input signal end of the register unit is connected to the output end of the shift register unit of the previous stage, and the reset signal end of the last stage shift register unit is connected to the start signal end;
- the input signal terminals of the remaining stages of the shift register unit are connected to the output end of the shift register unit of the previous stage, and the reset signal end is connected to the output of the shift register unit of the next stage.
- the array substrate gate driving circuit includes N stages, and N is the number of gate lines.
- the start signal STV is input as an input signal to the first stage shift register unit, and sequentially outputs the gate drive signal to the gate line, and the input signal of the nth stage is output signal of the n-1th stage.
- n ⁇ N the number of gate lines.
- Fig. 5 is a timing chart showing respective signal terminals of a shift register unit in accordance with a fourth embodiment of the present invention.
- the operation method of the nth (n ⁇ N, N is the number of stages of the array substrate gate circuit) shift register unit in the array substrate gate driving circuit provided by the embodiment of the present invention is described below with reference to FIG. 5, wherein all The shift register unit is the shift register unit shown in FIG. 2, and all TFTs are turned on at a high level and turned off at a low level.
- the first voltage signal is a high level signal VDD
- the second voltage signal is a low level signal VSS:
- the first stage S1 the first clock signal CK is at a low level, the second clock signal CKB is at a high level, and the pre-stage output signal OUTPUT(nl) as an input signal is at a high level, which is a lower-level output of the reset signal.
- the signal OUTPUT(n+l) is low level; the high level input signal OUTPUT(nl) turns on the transistor T1, and the first voltage signal charges the first node P1, so that the first node P1 is at a high level, When the third thin film transistor T3 is turned on, the output terminal OUTPUT(n) outputs a low voltage;
- the second clock signal CKB of the high level causes the fourth thin film transistor T4 to be turned on, and charges the second node P2 through the fourth thin film transistor T4, but, due to the fifth thin film transistor that is responsive to the voltage of the first node P1 T5 is also in an on state, and the second node P2 is discharged through the fifth thin film transistor T5, at which time the second node P2 is at a low level.
- the second stage S2 the first clock signal CK is at a high level, the second clock signal CKB is at a low level, and the front stage output signal OUTPUT(nl) as an input signal is at a low level as a lower level of the reset signal The output signal OUTPUT(n+l) is low;
- the third thin film transistor T3 is in an open state, and CK is at a high level. Due to the bootstrap action of the first capacitor C1, the voltage of the first node P1 continues to rise, and T3 continues to open, the first node P1 Further pull high, OUTPUT (n) output high level;
- the sixth thin film transistor T6 in response to the voltage of the output terminal is also turned on, and the fifth thin film transistor T5 and the sixth thin film transistor T6 simultaneously discharge the second node P2, at which time the voltage of the second node P2 is further lowered, in response to the first
- the seventh thin film transistor T7 and the eighth thin film transistor T8 of the two-node P2 voltage are turned off.
- the third stage S3 the first clock signal CK is at a low level, the second clock signal CKB is at a high level, and the front stage output signal OUTPUT(nl) as an input signal is at a low level, which is the next output of the reset signal.
- the signal OUTPUT(n+l) is at a high level; the second thin film transistor T2 is turned on, and supplies a second voltage signal VSS to the first node P1, and the first node P1 is rapidly lowered to a low level in response to the first node voltage.
- the third thin film transistor T3 and the fifth thin film transistor T5 are turned off; the second node P2 is a high level provided by the second clock signal, and the seventh thin film transistor T7 and the eighth thin film transistor T8 are turned on, and the first capacitor C1 is turned on.
- the two ends are discharged, that is, the output terminal OUTPUT(n) is rapidly discharged so that the output is low, and the sixth thin film transistor T6 is turned off to realize the reset function.
- the first voltage signal is a low level signal VSS
- the second voltage signal is a high level signal VDD
- the INPUT terminal is used as a reset signal terminal
- the RESET terminal is used as an input signal terminal;
- the input signal terminal of the last stage shift register unit is connected to the start signal terminal, and the reset signal terminal of the last stage shift register unit is connected to the output terminal of the previous stage shift register unit.
- the input signal terminal of the nth stage shift register unit is connected to the output terminal of the n+1th stage shift register unit, and at the same time, the reset of the nth stage shift register unit The signal terminal is connected to the output of the n-1th stage shift register unit.
- P2 (2) in FIG. 6 represents a timing chart of the second node when the gate driving circuit composed of the shift register unit shown in FIG. 2 operates
- P2 (3) represents the shift shown in FIG.
- a second capacitor C2 is provided in the shift register unit shown in FIG. 3.
- the second capacitor C2 can maintain the high potential of the second node P2, and the leakage due to the fifth thin film transistor T5 and the sixth thin film transistor T6 can be reduced.
- the influence of the current reduces the noise of the second node. Therefore, after the capacitor C2 is added, the high-level potential of the second node P2 is more stable, further improving the stability of the shift register unit.
- the embodiment of the present invention provides a shift register unit and a gate driving circuit, where the shift register unit includes: an input module, a reset module, an output module, a pull-down control module, and a pull-down module, where The input module is connected to the input signal end to provide a first voltage signal to the output end in response to the input signal; the reset module connection reset signal end is responsive to the reset signal, and the second voltage signal is provided to the input module as the input end of the input module.
- the shift register unit adopts a DC pull-down mode by using fewer thin film transistors to suppress interference noise caused by changes in the AC clock signal, and realizes a signal transmission function and a noise reduction function of the shift register unit.
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- Liquid Crystal Display Device Control (AREA)
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Abstract
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14/375,049 US9640276B2 (en) | 2013-04-10 | 2013-11-11 | Shift register unit and gate driving circuit |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310122415.1A CN103226981B (zh) | 2013-04-10 | 2013-04-10 | 一种移位寄存器单元及栅极驱动电路 |
| CN201310122415.1 | 2013-04-10 |
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| Publication Number | Publication Date |
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| WO2014166251A1 true WO2014166251A1 (zh) | 2014-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2013/086888 Ceased WO2014166251A1 (zh) | 2013-04-10 | 2013-11-11 | 移位寄存器单元及栅极驱动电路 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US9640276B2 (zh) |
| CN (1) | CN103226981B (zh) |
| WO (1) | WO2014166251A1 (zh) |
Cited By (3)
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| US20150263722A1 (en) * | 2014-03-13 | 2015-09-17 | Samsung Display Co. Ltd. | Gate driver and display device including the same |
| CN105304054A (zh) * | 2015-10-08 | 2016-02-03 | 友达光电股份有限公司 | 具有静电放电功能的栅极驱动电路及栅极驱动方法 |
| CN106920519A (zh) * | 2017-05-10 | 2017-07-04 | 京东方科技集团股份有限公司 | 一种移位寄存器单元和移位寄存器 |
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| CN105185345B (zh) * | 2015-10-23 | 2018-09-07 | 京东方科技集团股份有限公司 | 一种栅极驱动电路及其驱动方法、显示面板 |
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Also Published As
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| CN103226981A (zh) | 2013-07-31 |
| CN103226981B (zh) | 2015-09-16 |
| US20160268004A1 (en) | 2016-09-15 |
| US9640276B2 (en) | 2017-05-02 |
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