WO2015090019A1 - 移位寄存器单元、栅极驱动电路及显示装置 - Google Patents
移位寄存器单元、栅极驱动电路及显示装置 Download PDFInfo
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- WO2015090019A1 WO2015090019A1 PCT/CN2014/080116 CN2014080116W WO2015090019A1 WO 2015090019 A1 WO2015090019 A1 WO 2015090019A1 CN 2014080116 W CN2014080116 W CN 2014080116W WO 2015090019 A1 WO2015090019 A1 WO 2015090019A1
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- 230000002457 bidirectional effect Effects 0.000 claims abstract description 25
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- 101000749298 Homo sapiens Dual specificity protein kinase CLK4 Proteins 0.000 description 26
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- 101000749294 Homo sapiens Dual specificity protein kinase CLK1 Proteins 0.000 description 22
- 102100040844 Dual specificity protein kinase CLK2 Human genes 0.000 description 21
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- 101000749291 Homo sapiens Dual specificity protein kinase CLK2 Proteins 0.000 description 21
- 101000749304 Homo sapiens Dual specificity protein kinase CLK3 Proteins 0.000 description 21
- 238000010586 diagram Methods 0.000 description 17
- 238000000034 method Methods 0.000 description 9
- 239000004973 liquid crystal related substance Substances 0.000 description 4
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Classifications
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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
-
- 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
-
- 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
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C19/00—Digital stores in which the information is moved stepwise, e.g. shift registers
- G11C19/18—Digital stores in which the information is moved stepwise, e.g. shift registers using capacitors as main elements of the stages
- G11C19/182—Digital stores in which the information is moved stepwise, e.g. shift registers using capacitors as main elements of the stages in combination with semiconductor elements, e.g. bipolar transistors, diodes
- G11C19/184—Digital stores in which the information is moved stepwise, e.g. shift registers using capacitors as main elements of the stages in combination with semiconductor elements, e.g. bipolar transistors, diodes with field-effect transistors, e.g. MOS-FET
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- 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
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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
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0421—Structural details of the set of electrodes
- G09G2300/0426—Layout of electrodes and connections
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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
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0871—Several active elements per pixel in active matrix panels with level shifting
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
- G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
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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
- 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
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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
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
- G09G2310/061—Details of flat display driving waveforms for resetting or blanking
-
- 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
- Shift register unit gate drive circuit and display device
- the present invention relates to a shift register unit, a gate drive circuit, and a display device. Background technique
- a Thin Film Transistor-Liquid Crystal Display (TFT-LCD) is composed of a matrix of pixels defined by crossing gate lines and data lines extending in the horizontal and vertical directions, respectively.
- TFT-LCD performs display
- a gate wave of a certain width is input to each pixel row through the gate line from top to bottom through the gate driver to gate the corresponding pixel row, and then the source (Source) driver
- Source Source
- the signals required for each pixel row are sequentially output from the top to the bottom through the data lines to the corresponding pixel rows.
- the gate driver and source driver of the display have more outputs, and the length of the driver circuit will also increase, which is not conducive to the bonding process of the module driver circuit.
- the existing display is often manufactured using GOA (Gate Driver on
- Array, array substrate row drive circuit design, TFT (Thin Film Transistor) gate switch circuit is integrated on the array substrate of the display panel to form a scan drive for the display panel, thereby eliminating the gate The Bonding area of the driving circuit and the peripheral wiring space, thereby realizing the aesthetic design of the two sides of the display panel and the narrow border.
- TFT Thin Film Transistor
- CMOS Complementary Metal Oxide Semiconductor
- the NMOS LTPS GOA unit circuit shown in Figure 1 has one-way scanning (OUT-n-1), pull-up control (so that the signal output terminal OUT-n outputs a high level), and a unidirectional DC pull-down (the signal output terminal) Features such as OUT—n pull-down to low level.
- the application range of the one-way scanning GOA circuit is relatively small.
- the signal output terminal OUT-n of the GOA circuit is pulled down to a low level only when the transistor M01 is turned on. Therefore, when the interference signal causes the transistor M01 to be erroneously disconnected, the pull-down of the signal output terminal OUT-n cannot be realized.
- the one-way pull-down method will reduce the stability of the GOA circuit.
- the above single MOS G0A circuit is driven by two clock signals CLK and CLKB, so that only two clock signals CLK and CLKB are driven in one duty cycle of the G0A circuit, so the G0A circuit needs to be large.
- the external drive capability results in increased circuit power consumption and reduces the lifetime of the GOA circuit.
- a shift register unit including: a bidirectional scan precharge module, a pull-up module, a pull-down control module, a reset module, and a pull-down module.
- the bidirectional scanning pre-charging module is respectively connected to the first signal input end, the first voltage end, the second signal input end, the second voltage end, and the pull-up control node, and is configured to be according to the first signal input end and the The signal input by the second signal input terminal controls the potential of the pull-up control node, and the pull-up control node is a connection point of the bidirectional scan pre-charging module and the pull-up module.
- the pull-up module is respectively connected to the pull-up control node, the first clock signal end and the signal output end, and configured to cause the signal output end to output the first one under the potential control of the pull-up control node The signal at the clock signal end.
- the pull-down control module is respectively connected to the second clock signal end, the third clock signal end, the fourth clock signal end, and the pull-down control node; and configured to be according to the second clock signal end, the third clock signal end, And a signal input by the fourth clock signal terminal controls a potential of the pull-down control node, where the pull-down control node is a connection point of the pull-down control module and the pull-down module.
- the reset control module is respectively connected to the third signal input end and the pull-down control node, and configured to control a potential of the pull-down control node according to a signal input by the third signal input end, and at the pull-down control node
- the potential of the pull-up control node and the output signal of the signal output are reset before the operation of the shift register unit under the control of the potential.
- the pull-down module is respectively connected to the pull-down control node, the pull-up control node, the third voltage terminal and the signal output end, and is configured to pull the pull-up under the control of the potential of the pull-down control node The potential of the control node and the output signal of the signal output are pulled down to the level of the third voltage terminal.
- a gate driving circuit comprising the shift register unit as described above.
- the first signal input of each of the remaining shift register units is coupled to the signal output of the adjacent shift register unit adjacent thereto.
- the signal output of each of the remaining shift register units is coupled to the first signal input of the adjacent next stage shift register unit.
- the signal output of each of the remaining shift register units is coupled to the second signal input of its adjacent upper shift register unit.
- the second signal input of each of the remaining shift register units is coupled to the signal output of the adjacent next stage shift register unit.
- a display device comprising the gate drive circuit as described above.
- the shift register unit can be input according to different voltage signals input by the first signal input end and the second signal input end of the bidirectional scanning pre-charging module. Bidirectional scanning is achieved to expand the range of application of the gate drive circuit.
- the pull-down module pulls the potential of the pull-up control node and the signal of the signal output to a low level, so that the shift register unit has a bidirectional pull-down feature.
- the shift register unit is driven by four clock signals in one duty cycle to reduce circuit power consumption.
- 1 is a schematic structural diagram of a shift register unit provided by the prior art
- FIG. 2 is a schematic structural diagram of a shift register unit according to an embodiment of the present invention
- FIG. 3 is a schematic structural diagram of another shift register unit according to an embodiment of the present invention. Signal timing waveform diagram when the shift register unit is operating;
- FIG. 4b is a waveform diagram of signal timing when another shift register unit is operated according to an embodiment of the present invention.
- FIG. 6, FIG. 7, and FIG. 8 are schematic diagrams showing an operation state of a shift register unit according to an embodiment of the present invention.
- FIG. 9, FIG. 10, FIG. 11 are diagrams showing another operation of a shift register unit according to an embodiment of the present invention. State diagram
- FIG. 12 is a schematic structural diagram of still another shift register unit according to an embodiment of the present invention
- FIG. 13 is a schematic structural diagram of a gate driving circuit according to an embodiment of the present invention; a signal timing waveform diagram when the gate driving circuit operates;
- FIG. 14b is a waveform diagram of signal timing when another gate driving circuit is operated according to an embodiment of the present invention. detailed description
- All the transistors used in all embodiments of the present invention may be thin film transistors or field effect transistors or other devices having the same characteristics. Since the source and the drain of the transistors used herein are symmetrical, the source and the drain are not. difference. In the embodiment of the present invention, in order to distinguish the two poles of the transistor except the gate, one of the poles is referred to as a source and the other pole is referred to as a drain. In addition, according to the characteristics of the transistor, the transistor can be divided into an N-type transistor or a P-type transistor. In the embodiment of the invention, when the N-type transistor is used, the first pole can be the source, and the second pole can be the drain. In the case of a P-type transistor, the first pole may be the drain and the second pole may be the source.
- the transistors used in the embodiments of the present invention may be either N-type transistors or P-type transistors.
- FIG. 2 is a schematic structural diagram of a shift register unit according to an embodiment of the present invention.
- the shift register unit includes: a bidirectional scan precharge module 10, a pull-up module 20, a pull-down control module 30, a reset module 40, and a pull-down module 50.
- the bidirectional scanning pre-charging module 10 is respectively connected to the first signal input terminal INPUT1, the first voltage end
- the bidirectional scanning pre-charging module 10 is configured to control the potential of the pull-up control node PU according to the signals input by the first signal input terminal INPUT1 and the second signal input terminal INPUT2, and the pull-up control node PU is the bidirectional scanning pre-charging module 10 and the pull-up.
- the connection point of module 20 is configured to control the potential of the pull-up control node PU according to the signals input by the first signal input terminal INPUT1 and the second signal input terminal INPUT2, and the pull-up control node PU is the bidirectional scanning pre-charging module 10 and the pull-up.
- the pull-up module 20 is connected to the pull-up control node PU, the first clock signal terminal CLK1, and the signal, respectively.
- the output terminal OUTPUT is configured to cause the signal output terminal OUTPUT to output a signal of the first clock signal terminal CLK1 under the control of the potential of the pull-up control node PU.
- the pull-down control module 30 is connected to the second clock signal terminal CLK2, the third clock signal terminal CLK3, the fourth clock signal terminal CLK4, and the pull-down control node PD, respectively, and is configured to be based on the second clock signal terminal CLK2 and the third clock signal terminal CLK3.
- the signal input from the fourth clock signal terminal CLK4 controls the potential of the pull-down control node PD, and the pull-down control node PD is the connection point of the pull-down control module 30 and the pull-down module 50.
- the reset module 40 is connected to the third signal input terminal INPUT3 and the pull-down control node PD, respectively, and is configured to control the potential of the pull-down control node PD according to the signal STV input by the third signal input terminal INPUT3, and control the potential of the pull-down control node PD
- the potential of the pull-up control node PU and the output signal of the signal output terminal OUTPUT are reset before the operation of the shift register unit.
- the pull-down module 50 is connected to the pull-down control node PU, the pull-up control node PD, the third voltage terminal V, and the signal output terminal OUTPUT, respectively, and is configured to pull up the potential of the control node PU under the control of the potential of the pull-down control node PU and The output signal of the signal output terminal OUTPUT is pulled down to the level of the third voltage terminal V.
- the shift signal unit can be bidirectionally scanned according to the first signal input end and the second signal input end of the bidirectional scan pre-charging module, thereby expanding the The applicable range of the shift register unit.
- the pull-down module pulls down the potential of the pull-up control node and the output signal of the signal output to a low level, so that the shift register unit has the feature of bidirectional pull-down.
- the shift register unit is driven by four clock signals in one operation cycle, thereby reducing circuit power consumption.
- the bidirectional scanning pre-charging module 10 includes a first transistor T1 and a second transistor T2.
- the first transistor of the first transistor T1 is connected to the first voltage terminal VDS, the gate is connected to the first signal input terminal INPUT1 to receive the input signal STV-n-1, and the second electrode is connected to the pull-up control node PU.
- the first transistor of the second transistor T2 is connected to the pull-up control node PU, the gate is connected to the second signal input terminal INPUT2 to receive the input signal STV_n+1, and the second electrode is connected to the second voltage terminal VSD.
- STV is a start signal of an input shift register unit located in the first stage
- STV_n-1 is an output signal of a shift register unit located one level above the shift register unit
- STV_n+1 is an output signal of a shift register unit located in the next stage of the shift register unit.
- the pull-up module 20 includes a third transistor T3 and a first capacitor Cl.
- the first transistor of the third transistor T3 is connected to the first clock signal terminal CLK1, the gate is connected to the pull-up control node PU, and the second electrode is connected to the signal output terminal OUTPUT.
- the first capacitor C1 is connected in parallel between the gate of the third transistor T3 and the second pole.
- the pull-down control module 30 includes fourth to eighth transistors T4 - T8 and a second electrical answer C2.
- the first transistor of the fourth transistor T4 is connected to the second clock signal terminal CLK2, and the gate is connected to the second voltage terminal VSD.
- the first transistor of the fifth transistor T5 is connected to the third clock signal terminal CLK3, and the gate is connected to the first voltage terminal VDS.
- the first transistor of the sixth transistor T6 is connected to the fourth voltage terminal V, the gate is connected to the second transistor T4 and the second electrode of the fifth transistor T5, and the second electrode is connected to the pull-down control node PD.
- the first transistor of the seventh transistor T7 is connected to the fourth voltage terminal V, and the gate is connected to the fourth clock signal terminal.
- the second pole is connected to the pull-down control node PD.
- the first transistor of the eighth transistor T8 is connected to the pull-down control node PD, the gate is connected to the pull-up control node PU, and the second pole is connected to the third voltage terminal V.
- One end of the second capacitor C2 is connected to the second pole of the seventh transistor T7, and the other end is connected to the third voltage terminal V.
- the reset module 40 includes a ninth transistor T9 whose first pole is connected to the second pole of the sixth transistor ⁇ 6, and the gate and the second pole are connected to the third signal input terminal INPUT3.
- the pull-down module 50 includes a tenth transistor T10 and an eleventh transistor T11.
- the first pole of the tenth transistor T10 is connected to the pull-up control node PU, the gate is connected to the pull-down control node PD, and the second pole is connected to the third voltage terminal V.
- the eleventh transistor T11 has a first pole connected to the signal output terminal OUTPUT, a gate connected to the pull-down control node PD, and a second pole connected to the third voltage terminal V.
- the shift register unit has the structure shown in FIG. 3 and the transistors are all N-type transistors as an example; and in conjunction with the scan timing chart of the shift register unit, the operation process of the shift register unit is detailed. description.
- the third voltage terminal V and the fourth voltage terminal V may be grounded or input low.
- Level VSS or VGL Alternatively, the third voltage terminal V, the fourth voltage terminal V, may input a high voltage Vdd or VGH.
- an N-type transistor is taken as an example for description. Therefore, in the following embodiments, the third voltage terminal V is input with the low level VGL, the fourth voltage terminal V, and the high level VGH is input as an example for description.
- the shift register unit When the first voltage terminal VDS is at a high level VGH and the second voltage terminal VSD is at a low level VGL, the shift register unit is in a forward scan state, and its scan timing chart is as shown in FIG. 4a.
- the third signal input terminal INPUT3 inputs a high level, and the start signal STV of the gate drive circuit can be selected as the signal input to the third signal input terminal INPUT3.
- the high level causes the potential of the pull-down control node PD to rise to a high level, thereby turning on the tenth transistor T10 and the eleventh transistor T11, and resetting the potential of the pull-up control node PU and the signal output terminal OUTPUT to a low level. So that the shift register unit can work normally. Avoid signal output terminal OUTPUT becomes high level under the action of other interference signals, and its controlled gate line is gated under the action of high level, which eventually causes gate line strobe error. In other stages, the third signal input terminal INPUT3 input signal STV is low level. Therefore, this phase can be called the reset phase.
- the signal STV_n-1 input by the first signal input terminal INPUT1 is at a high level
- the precharge transistor ie, the first transistor T1
- the potential of the pull-up control node PU rises to a high level VGH.
- the fourth transistor T4 is turned off
- the fifth transistor T5 is turned on
- the gate of the sixth transistor T6 receives the low level input from the third clock signal terminal CLK3 and is turned off.
- the fourth clock signal terminal CLK4 connected to the gate of the seventh transistor T7 is at a low level, and thus the seventh transistor T7 is turned off.
- the gate of the eighth transistor T8 is connected to the pull-up control node PU, and the potential of the pull-up control node PU is at a high level, so that the eighth transistor T8 is turned on, and the potential of the pull-down control node PD of the second capacitor C2 is connected.
- the discharge is pulled down to a low level, and thus the tenth transistor T10 and the eleventh transistor T11 are turned off.
- the signal STV input from the third signal input terminal INPUT3 is at a low level, so that the ninth transistor T9 is turned off.
- the a stage is the precharge phase of the first capacitor C1 in the shift register unit, and the voltage across the first capacitor C1 is precharged to VGH-VGL.
- the signal STV_n-1 input from the first signal input terminal INPUT1 is at a low level, and the first transistor T1 is turned off. Since the third clock signal terminal CLK3 and the fourth clock signal terminal CLK4 are still at a low level, the sixth transistor T6 and the seventh transistor T7 are still turned off. Since the pull-up control node PU is at a high level, the eighth transistor T8 is still turned on. The pull-down control node PD remains at a low level VGL. The tenth transistor T10 and the eleventh transistor T11 are turned off. The voltage of the first capacitor C1 is maintained at VGH-VGL.
- the high potential of the pull-up control node PU is boosted to a higher level 2VGH-VGL by the voltage coupling effect of the first capacitor C1, and the upper Pulling the high potential of the control node PU also controls the third transistor T3 to be turned on, so that the signal output terminal OUTPUT outputs a high level.
- the b stage is the output stage of the shift register unit.
- the signal STV_n+1 input by the second signal input terminal INPUT2 is at a high level, and the second transistor T2 is turned on, and the potential of the pull-up control node PU is pulled down to a low level VGL, so that Eight transistor T8 is turned off.
- the fourth clock signal terminal CLK4 is still at a low level, so that the seventh transistor T7 is turned off.
- the third clock signal terminal CLK3 outputs a high level, and the sixth transistor T6 is turned on, so that the potential of the pull-down control node PD becomes a high level VGH, and the voltage across the second capacitor C2 is charged to VGH-VGL.
- the tenth transistor T10 and the eleventh transistor T11 are turned on under the high potential control of the pull-down control node PD.
- the output signal of the signal output terminal OUTPUT is pulled down to the low level VGL by the eleventh transistor T11, and the potential of the pull-up control node PU is pulled down to the low level VGL by the tenth transistor T10. Therefore, the c stage is the pull-down phase of the shift register unit.
- the signal STV_n-1 input by the first signal input terminal INPUT1 and the signal STV_n+1 input by the second signal input terminal input signal INPUT2 are both low level VGL, and therefore, the first transistor T1 And the second transistor T2 is kept off.
- the sixth transistor T6 When the third clock signal terminal CLK3 is at a high level and the first, second, and fourth clock signals CLK1, CLK2, and CLK4 are at a low level, the sixth transistor T6 is turned on, thereby charging the second capacitor C2 to VGH- VGL.
- the first clock signal terminal CLK1 is at a high level and the second to fourth clock signal terminals CLK2 - CLK4 are at a low level, or when the second clock signal terminal CLK2 is at a high level and the first, third, and fourth clocks
- the pull-down control node PD When the signal terminals CLK1, CLK3, and CLK4 are at a low level, the pull-down control node PD is kept at a high level by the second capacitor C2.
- the pull-down control node PD is maintained at the high level VGH by the sixth transistor T6, the seventh transistor ⁇ 7, and the second capacitor C2.
- the high potential of the pull-down control node PD causes the tenth transistor T10 and the eleventh transistor T11 to be continuously turned on, thereby achieving a DC pull-down of the signal output terminal OUTPUT and the pull-up control node PU. Therefore, the following problems can be avoided:
- the signal output OUTPUT becomes high level under the action of other interference signals, and the gate line controlled by it is turned on at the high level, which eventually causes the gate line to open incorrectly.
- the shift register unit When the first voltage terminal VDS is at a low level VGL and the second voltage terminal VSD is at a high level VGH, the shift register unit is in a reverse scan state, and its scan timing diagram is as shown in FIG. 4b.
- the signal STV_n+1 input by the second signal input terminal INPUT2 is at a high level
- the pre-charge transistor that is, the second transistor T2 is turned on
- the VSD high level charges the pull-up control node PU to a high level.
- Flat VGH Since the fifth transistor T5 is turned off and the fourth transistor T4 is turned on, the gate of the sixth transistor T6 is turned off due to the connected second clock signal terminal CLK2 being at a low level.
- the seventh transistor T7 gate is turned off due to the connected fourth clock signal terminal CLK4 being at a low level.
- the phase is the pre-charging phase of the first capacitor C1 in the shift register unit, and the voltage across the first capacitor C1 is precharged to VGH-VGL.
- the signal STV_n+1 input by the second signal input terminal INPUT2 is at a low level, and the second transistor T2 is turned off. Since the second clock signal terminal CLK2 and the fourth clock signal terminal CLK4 are still input to the low level, the sixth transistor T6 and the seventh transistor T7 are still turned off. Since the potential of the pull-up control node PU is at a high level, the eighth transistor T8 is still turned on. Therefore, the potential of the pull-down control node PD remains at the low level VGL, and therefore, the tenth transistor T10 and the eleventh transistor T11 are still turned off, and the voltage across the first capacitor C1 remains VGH-VGL.
- the first clock signal terminal CLK1 is low-powered When the level is changed to the high level VGH, the high potential of the pull-up control node PU is coupled to the higher level 2VGH-VGL by the first capacitor C1, and the high potential control third transistor T3 of the pull-up control node PU is turned on. So that the signal output terminal OUTPUT outputs a high level. From the above, b, the stage is the output stage of the shift register unit.
- the signal STV_n-1 input by the first signal input terminal INPUT1 is at a high level, and the first transistor T1 is turned on, and the potential of the pull-up control node PU is pulled down to a low level VGL, so Eight transistor T8 is turned off. Since the fourth clock signal terminal CLK4 is still at the low level, the seventh transistor T7 is still turned off. Since the second clock signal terminal CLK2 becomes a high level, the sixth transistor T6 is turned on, the second capacitor C2 is charged, and the voltage across the second capacitor C2 is charged to VGH-VGL, so that the potential of the control node PD is pulled down. It becomes high level VGH.
- the stage is the pull-down stage of the shift register unit.
- the signal STV_n-1 input by the first signal input terminal INPUT1 and the signal STV_n+1 input by the second signal input terminal INPUT2 are both low level VGL, the first transistor T1 and the second transistor. T2 remains cut off.
- the pull-down control node PD When CLK4 is at a low level, or when the third clock signal terminal CLK3 is at a high level and the first, second, and fourth clock signal terminals CLK1, CLK2, and CLK4 are at a low level, the pull-down control node PD is held by the second capacitor C2. Is high. Therefore, at the d stage, the potential of the pull-down control node PD is maintained at the high level VGH by the sixth transistor T6, the seventh transistor ⁇ 7, and the second capacitor C2.
- the high potential of the pull-down control node PD causes the tenth transistor T10 and the eleventh transistor T11 to be continuously turned on, thereby achieving a DC pull-down of the signal output terminal OUTPUT and the pull-up control node PU. Therefore, the following problems can be avoided:
- the signal output terminal OUTPUT becomes a high level under the action of other interference signals, and causes a row of gate lines controlled by it to open under the action of a high level, eventually
- the above embodiment is described by taking an example of a transistor in the shift register unit using an N-type transistor.
- the structure is as shown in FIG.
- the specific working process can refer to the working principle of the shift register unit formed by the above-mentioned N-type transistor, and the timing of the driving signal needs to be adjusted accordingly, which will not be described here.
- FIG. 13 is a schematic block diagram of a gate driving circuit according to an embodiment of the present invention.
- the gate driving circuit includes a plurality of stages of shift register units as described above.
- only five shift registers are used as an example. They are the first-stage shift register, the second-stage shift register, the n-2th shift register, the n-1th shift register, and the N-stage shift register.
- each shift register unit includes a first clock signal terminal CLK1, a second clock signal terminal CLK2, a third clock signal terminal CLK3, and a Four clock signal terminals CLK4.
- the first signal input terminal of each of the other shift register units is connected to the signal output terminal OUTPUT of the adjacent shift register unit adjacent thereto.
- the signal output OUTPUT of each of the remaining shift register units is connected to the first signal input of the adjacent next stage shift register unit, for example G(n-l).
- the signal output terminal OUTPUT of each of the other shift register units is connected to a second signal input terminal of the adjacent upper shift register unit, for example, G(n+1). .
- each of the remaining shift register units e.g., G(n+1)
- the second signal input of each of the remaining shift register units is coupled to the signal output OUTPUT of the adjacent next stage shift register unit.
- the first signal input end of the first stage shift register unit for example G(nl) is connected to the start signal STV of the gate drive circuit, and the second signal input end of the last stage shift register unit is, for example, G(n+1) Connected to the start signal STV of the gate drive circuit.
- the gate driving circuit performs forward scanning
- the timing diagram of each signal is as shown in FIG. 14a, and the scanning signals of the respective rows of the GOA circuit are sequentially G1, G2, G3, G4, ... Gn-1, Gn
- the gate drive circuit performs reverse scan
- the timing diagram of each signal is as shown in FIG. 14b, and the scan signals of each line of the GOA circuit are sequentially Gn, Gn-1, Gn-2, Gn-3... G2, Gl.
- the third signal input terminal INPUT3 input gate drive circuit start signal STV resets all shift register units.
- the output of the GOA unit of the previous stage is the trigger signal of the next stage GOA unit, and the output of the next stage GOA unit is the reset signal of the GOA unit of the previous stage; when the reverse scan is performed, the next stage of the GOA unit is the previous one.
- the trigger signal of the level GOA unit, the output of the upper level GOA unit is the reset signal of the next stage GOA unit.
- the third signal input terminal INPUT3 of each stage of the GOA unit is connected to the start signal input end of the gate drive circuit, and at the beginning of each frame, the pull-down control node PD of all GOA circuits is charged once to increase its potential. To VGH.
- the gate driving circuit provided by the embodiment of the present invention includes a multi-stage shift register unit, and each stage shift register unit includes a bidirectional scanning pre-charging module, a pull-up module, a pull-down control module, a reset module, and a pull-down module.
- the shift register unit can be bidirectionally scanned according to different voltage signals input by the first signal input terminal and the second signal input terminal of the bidirectional scanning pre-charging module, thereby expanding the applicable range of the gate driving circuit.
- the pull-down module pulls down the potential of the pull-up control node and the signal at the signal output to a low level, so that the shift register unit has a bidirectional pull-down feature.
- the shift register unit is driven by four clock signals in one duty cycle to reduce circuit power consumption.
- Embodiments of the present invention provide a display device including any of the gate driving circuits as described above.
- the same advantages as the gate driving circuit provided by the foregoing embodiments of the present invention are provided. Since the gate driving circuit has been described in detail in the foregoing embodiments, details are not described herein.
- the display device may specifically be any liquid crystal display product or component having a display function such as a liquid crystal display, a liquid crystal television, a digital photo frame, a mobile phone, a tablet computer, or the like.
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Abstract
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US20160086562A1 (en) | 2016-03-24 |
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