WO2015018149A1 - 移位寄存单元、移位寄存器、栅极驱动器和显示面板 - Google Patents
移位寄存单元、移位寄存器、栅极驱动器和显示面板 Download PDFInfo
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- WO2015018149A1 WO2015018149A1 PCT/CN2013/088662 CN2013088662W WO2015018149A1 WO 2015018149 A1 WO2015018149 A1 WO 2015018149A1 CN 2013088662 W CN2013088662 W CN 2013088662W WO 2015018149 A1 WO2015018149 A1 WO 2015018149A1
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- pull
- transistor
- shift register
- down control
- input terminal
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- 239000003990 capacitor Substances 0.000 claims abstract description 26
- 238000011156 evaluation Methods 0.000 claims description 25
- 239000010409 thin film Substances 0.000 claims description 22
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 101100102583 Schizosaccharomyces pombe (strain 972 / ATCC 24843) vgl1 gene Proteins 0.000 description 25
- 102100023478 Transcription cofactor vestigial-like protein 1 Human genes 0.000 description 25
- 238000010586 diagram Methods 0.000 description 14
- 101100102598 Mus musculus Vgll2 gene Proteins 0.000 description 11
- 102100023477 Transcription cofactor vestigial-like protein 2 Human genes 0.000 description 11
- 102100023476 Transcription cofactor vestigial-like protein 3 Human genes 0.000 description 6
- 101710176204 Transcription cofactor vestigial-like protein 3 Proteins 0.000 description 6
- 239000013078 crystal Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
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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
- G11C19/18—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
- 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
- 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
- G09G2310/0267—Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays
-
- 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
Definitions
- Shift register unit shift register, gate driver and display panel
- the present invention relates to the field of display, and in particular, to a shift register unit, a shift register including the shift register unit, and a display panel including the shift register. Background technique
- the basic shift register unit includes a pull-up transistor T100, an output pull-down transistor ⁇ 200, The bootstrap capacitor C1, the pull-up control transistor T300, the pull-down control transistor ⁇ 400, the pull-down unit 13, the first clock signal input terminal CLK, the drive signal input terminal OUT(n-1), and the drive signal output terminal OUT(n).
- the pull-up node PU point is a node connected to the gate of the pull-up transistor T100
- the pull-down node PD is a node connected to the gate of the output pull-down transistor T200
- the slave signal input terminal OUT (n-1) The start signal STV is input.
- Fig. 2 Shown in Fig. 2 is a timing chart of the signals of the shift register unit of Fig. 1, in which VGL represents a low level and VGH represents a high level.
- the basic shift register unit circuit shown in FIG. 1 when the basic shift register unit circuit shown in FIG. 1 is implemented using a Thin Film Transistor (TFT), the basic shift register unit can operate normally (as shown in FIG. 2). Shown in the solid line), where enhanced
- the TFT is, for example, a thin film transistor made of amorphous silicon (a-si) and polycrystalline silicon (p-si).
- the basic shift register unit circuit shown in Fig. 1 is realized using a depletion type TFT, the basic shift register unit does not operate normally (as shown by the broken line portion in Fig. 2). This is caused by the threshold voltage of the depletion mode TFT being less than zero.
- 3 and 4 show the difference between the enhancement type thin film transistor and the depletion type thin film transistor.
- 3 is a characteristic diagram of the enhancement type thin film transistor
- the vertical axis is the drain current (i D ) of the thin film transistor
- the horizontal axis is the gate-source voltage (V cs ).
- V cs gate-source voltage
- the vertical axis is the drain current (i D ) and the horizontal axis is the gate-source voltage (V cs ), but as can be seen from Figure 4, when ⁇ is 0 when, i D is much greater than 0, but only when the V es a constant negative voltage, i D was zero.
- oxide thin film transistors with depletion characteristics have received increasing attention as a very promising semiconductor technology, which is simpler and less expensive than p-si thin film transistors.
- the mobility is higher. Therefore, oxide thin film transistors are likely to become mainstream backplane driving technologies for various display panels (especially OLED (Organic Light Emitting Diode) and flexible display) in the future.
- OLED Organic Light Emitting Diode
- an object of the present invention is to provide a shift register unit, a shift register including the shift register unit, a gate driver including the shift register, and a display including the gate driver In the panel, a depletion thin film transistor can be used in the shift register unit.
- a shift register unit including a first drive signal input end, a first drive signal output end, a first clock signal input end, and a first a pull-up transistor, a first output pull-down transistor, a switching transistor, a reset transistor, and a bootstrap capacitor, a drain of the switching transistor being coupled to the first driving signal input, a drain of the first output pull-down transistor and the The first driving signal output end is connected, one end of the bootstrap capacitor is connected to the gate of the first pull-up transistor, and the other end is connected to the first driving signal output end, and the gate of the first pull-up transistor is connected a pole connected to a source of the switching transistor, a drain of the first pull-up transistor being connected to the first clock signal input terminal, a drain of the first pull-up transistor and the first driving signal output Connected to the end, the drain of the reset transistor and the switch crystal
- the source of the body tube is connected, wherein the shift register unit
- the pull-down unit includes a first pull-down module and a second pull-down module
- the first pull-down module is configured to output a second low level to the second end and the third end in a pre-charge phase a difference between the second low level and the third low level is less than a threshold voltage of the first output pull-down transistor
- the second pull-down module is configured to be in the evaluation stage to the second end And the third end outputs the first low level.
- the shift register unit includes a second drive signal output end, the second drive signal output end is synchronized with the first drive signal output end, and is capable of outputting a high level and the first low level.
- the second pull-down module includes a first pull-down control transistor and a second driving signal input terminal, and a gate of the first pull-down control transistor is connected to the second driving signal output end, the first pull-down control transistor a source is connected to the first low level input, a drain of the first pull-down control transistor is connected to the second end and the third end, the second driving signal input end is The first driving signal input terminal is synchronized, and the second driving signal input end is capable of inputting a high level and the first low level, and the second driving signal input end is connected to the first end.
- the second pull-down module further includes a second pull-down control transistor, a gate of the second pull-down control transistor is connected to the second driving signal output end, a source of the second pull-down control transistor and the The first low level input is connected, and the drain of the second pull down control transistor is connected to the first end.
- a second pull-down control transistor a gate of the second pull-down control transistor is connected to the second driving signal output end, a source of the second pull-down control transistor and the The first low level input is connected, and the drain of the second pull down control transistor is connected to the first end.
- the shift register unit further includes a second driving signal output module
- the second driving signal output module includes a second pull-up transistor and a second output pull-down transistor
- a gate of the second pull-up transistor is connected to a gate of the first pull-up transistor
- a drain of the second pull-up transistor is connected to the input end of the first clock signal
- the second pull-up a source of the transistor is coupled to the output of the second drive signal
- a gate of the second output pull-down transistor is coupled to a gate of the first output pull-down transistor
- a source of the second output pull-down transistor The first low level input terminal is connected
- the drain of the second output pull-down transistor is connected to the second driving signal output end.
- the shift register unit further includes a second clock signal input end, the second clock signal input end is opposite to the first clock signal input end, and the first pull-down module includes a third pull-down control transistor and a fourth pull-down control transistor, a resistance of the fourth pull-down control transistor is smaller than a resistance of the third pull-down transistor, and a gate and a drain of the third pull-down control transistor are connected to the second clock signal input end, a source of the three pull-down control transistor is connected to the second end, a gate of the fourth pull-down control transistor is connected to the second driving signal input end, a source of the fourth pull-down control transistor and the first Two low-level input terminals are connected, a drain of the fourth pull-down control transistor is connected to the second end, and the second end is connected to the third end.
- the first pull-down module includes a third pull-down control transistor and a fourth pull-down control transistor, a resistance of the fourth pull-down control transistor is smaller than a resistance of the third pull-down transistor, and a
- the shift register unit further includes a second clock signal input end, the second clock signal input end is opposite to the first clock signal input end, and the first pull-down module includes a third pull-down control transistor, a fourth pull-down control transistor, a fifth pull-down control transistor, and a sixth pull-down control transistor, wherein a resistance of the fourth pull-down control transistor is smaller than a resistance of the third pull-down transistor, and a resistance of the sixth pull-down control transistor is smaller than the fifth pull-down Controlling a resistance of the transistor, a gate and a drain of the third pull-down control transistor are connected to the second clock signal input end, a source of the third pull-down control transistor and a drain of the fourth pull-down control transistor Connected, the gate of the fourth pull-down control transistor is connected to the second driving signal input end, the source of the fourth pull-down control transistor is connected to the second low level input terminal, the fifth pull-down a drain of the control transistor is connected to the second clock signal input terminal, a gate of the fifth
- the shift register unit further includes a second clock signal input end, the second clock signal input end being opposite to the first clock signal input end, the first pull-down module comprising a seventh pull-down control transistor and a pull-down capacitor having a resistance greater than a resistance of the seventh pull-down control transistor, one end of the pull-down capacitor being connected to the second clock signal input end, and the other end of the pull-down capacitor being connected to the second end a gate of the seventh pull-down control transistor is connected to the second driving signal input end, and a source of the seventh pull-down control transistor is connected to the second low-level input terminal, the seventh pull-down control A drain of the transistor is coupled to the second end, and the second end is coupled to the third end.
- the first pull-down module comprising a seventh pull-down control transistor and a pull-down capacitor having a resistance greater than a resistance of the seventh pull-down control transistor, one end of the pull-down capacitor being connected to the second clock signal input end, and the other end of the pull-down capacitor being connected to the second
- At least one of the first pull-up transistor, the first output pull-down transistor, the switching transistor, and the reset transistor is a depletion transistor.
- the first pull-up transistor, the first output pull-down transistor, the switching transistor, and the reset transistor are all N-channel thin film transistors.
- a shift register including a multi-stage shift register unit, wherein the shift register unit is the above-described shift register unit provided by the present invention, and the next The first driving signal input end of the shift register unit is connected to the first driving signal output end of the shift register unit of the previous stage.
- a gate driver including the above shift register.
- a display panel including a thin film transistor, a data line, a gate line, and a gate driver electrically connected to the gate line, wherein the gate driver is provided by the present invention
- the gate driver, the first driving signal output terminal of the shift register unit in the shift register of the gate driver is connected to the gate line.
- the gate potential of the first output pull-down transistor is the first low level, and the source potential is the third low level. Therefore, the first output pull-down transistor is The evaluation phase is completely turned off; the source potential of the reset transistor is the second low level, and the gate potential is the first low level. Therefore, the reset transistor is completely turned off; the source potential of the switching transistor is the same as the potential of the pull-up node ( Above the high level), the gate potential of the switching transistor is at the first low level, and therefore, the switching transistor is also completely turned off.
- the first output pull-down transistor, the switching transistor, and the reset transistor are depletion transistors, the first output pull-down transistor, the switching transistor, and the reset transistor can be completely turned off during the evaluation phase, and no leakage occurs, so that the pull-up can be performed.
- the node is coupled to a higher potential.
- 1 is a circuit diagram of a conventional basic shift register unit
- FIG. 2 is a timing chart of signals of the shift register unit shown in FIG. 1 during operation;
- FIG. 3 is a characteristic diagram of the enhancement transistor;
- Figure 4 is a characteristic diagram of a depletion transistor
- Figure 5 is a schematic diagram of a shift register unit provided by the present invention.
- Figure 6 is a circuit diagram of a first embodiment of a shift register unit provided by the present invention.
- Figure 7 is a circuit diagram of a second embodiment of the shift register unit provided by the present invention.
- Figure 8 is a circuit diagram of a third embodiment of the shift register unit provided by the present invention.
- Figure 9 is a circuit diagram of a fourth embodiment of the shift register unit provided by the present invention.
- Figure 10 is a timing diagram of signals when the shift register unit provided by the present invention operates;
- Figure 11 is a schematic diagram of a shift register provided by the present invention. Description of the reference numerals
- T1 first pull-up transistor T2: first output pull-down transistor T3: switching transistor T4: reset transistor
- T5 second pull-up transistor T6: second output pull-down transistor T7: third pull-down control transistor T8: fourth pull-down control transistor T9: second pull-down control transistor T10: first pull-down control transistor T11: fifth pull-down control transistor T12: sixth pull-down control transistor T13: seventh pull-down control transistor C1: bootstrap capacitor
- VGL Low level
- VGL1 First low level
- VGL2 second low level
- VGL3 third low level
- FIG. 5 is a schematic diagram of a shift register unit provided by the present invention.
- the shift register unit includes a first driving signal input terminal 10, a first driving signal output terminal 11, a first clock signal input terminal CLK, a first pull-up transistor T1, and a first output pull-down transistor ⁇ 2.
- the switching transistor ⁇ 3, the reset transistor ⁇ 4 and the bootstrap capacitor C1 the drain of the switching transistor T3 is connected to the first driving signal input terminal 10, and the drain of the first output pull-down transistor T2 is connected to the first driving signal output terminal.
- One end of the capacitor C1 is connected to the gate of the first pull-up transistor T1, and the other end is connected to the first driving signal output terminal 11.
- the gate of the first pull-up transistor T1 is connected to the source of the switching transistor T3, and the first pull-up is performed.
- the drain of the transistor T1 is connected to the first clock signal input terminal CLK
- the source of the first pull-up transistor T1 is connected to the first driving signal output terminal 11
- the drain of the reset transistor T4 is connected to the source of the switching transistor T3, wherein
- the shift register unit further includes a pull-down unit 13, the first end a of the pull-down unit 13 is connected to the gate of the switching transistor T3, the second end b of the pull-down unit 13 and the reset transistor T4 Connected to the gate, the third end c of the pull-down unit 13 is connected to the gate of the first output pull-down transistor T2, resetting the crystal
- the source of the body tube T4 is connected to a second low level input capable of outputting a second low level VGL2, the source of the first output pull-down transistor ⁇ 2 and a third low level input capable of outputting a third low level VGL
- VGL2 is smaller than the threshold voltage of the reset transistor ⁇ 4 (ie, VGL1-VGL2 ⁇ Vth>T4 ), and the difference between the first low level VGL1 and the third low level VGL3 is smaller than the threshold voltage of the first output pull-down transistor T2 (ie, VGLl-VGL3 ⁇ V th , T2 ).
- the gate of the first pull-up transistor T1 is formed as a pull-up node PU
- the gate of the first output pull-down transistor T2 is formed as a pull-down node PD
- the pull-down node PD and the pull-down unit 13 The three ends c coincide (see Figures 6 to 9).
- the gate potential of the first output pull-down transistor T2 is the first low level VGL1, and the source potential is the third low level VGL3, therefore, the first output pull-down
- the transistor T2 is completely turned off in the evaluation phase;
- the source potential of the reset transistor T4 is the second low level VGL2, and the gate potential is the first low level VGL1, therefore, the reset transistor T4 is completely turned off;
- the source potential of the switching transistor T3 The same as the potential of the pull-up node PU (higher than the high level VGH), the gate potential of the switching transistor T3 is the first low level VGL1, and therefore, the switching transistor T3 is also completely turned off.
- the first output pull-down transistor T2 the switching transistor ⁇ 3, and the reset transistor ⁇ 4 are depletion transistors, the first output pull-down transistor ⁇ 2, the switching transistor ⁇ 3, and the reset transistor ⁇ 4 can be completely turned off during the evaluation phase, and no leakage occurs. Thereby, the pull-up node can be coupled to a higher potential, the first pull-up transistor T1 is turned on, and the first drive signal output terminal can output a high level VGH.
- the first terminal a of the pull-down unit 13 should be able to output a high level to the gate of the switching transistor T3, so that the switching transistor T3 is turned on, on the upper side.
- the node PU is charged.
- the reset transistor T4 and the first output pull-down transistor T2 should be at least substantially closed to ensure proper operation of the precharge phase.
- the second terminal b of the pull-down unit 13 should be able to output a high level VGH to the gate of the reset transistor T4, so that the reset transistor T4 is turned on. Start, thereby discharging the pull-up node PU.
- the pull-down unit may include a first pull-down module 13a and a second pull-down module 13b for use in a pre-charge phase (ie, phase 1 in FIG. 10).
- a second low level VGL2 is outputted to the second end b of the pull-down unit and the third end c of the pull-down unit, the difference between the second low level VGL2 and the third low level VGL3 being smaller than the first output pull-down transistor T2 Threshold voltage V th , T2 , (ie, VGL2-VGL3 ⁇ V th>T2 ), the second pull-down module 13b is configured to pull down the first end & second end b and the third end c of the unit during the evaluation phase
- the first low level VGL1 is output.
- the first output pull-down transistor T2 is completely turned off, and the reset transistor T4 is substantially turned off, so that the pull-up node PU can be normally charged.
- the shift register unit may further include a second driving signal output terminal 12, the second driving signal output terminal 12 is synchronized with the first driving signal output terminal 11, and is capable of outputting a high level VGH and a first low level VGL1
- the second pull-down module 13b may include a first pull-down control transistor T10 and a second driving signal input terminal 14.
- the gate of the first pull-down control transistor T10 is connected to the second driving signal output terminal 12, and the first pull-down control
- the source of the transistor T10 is connected to the first low level input terminal
- the drain of the first pull-down control transistor T10 is connected to the second end b and the third end c of the pull-down unit
- the second driving signal input end 14 is connected to the first end a of the pull-down unit
- the second driving signal input terminal 14 is synchronized with the first driving signal input terminal 10
- the second driving signal input terminal 14 can input a high level VGH to the first terminal a and First low Level VGL1.
- the synchronization of the second driving signal input terminal 14 with the first driving signal input terminal 10 means that when the high level VGH is input to the drain of the switching transistor T3 through the first driving signal input terminal 10, the second driving signal input terminal is passed. 14 inputs a high level VGH to the gate of the switching transistor T3, and when the low level is input to the drain of the switching transistor T3 through the first driving signal input terminal 10, passes through the second driving signal input terminal 14 to the gate of the switching transistor T3. Enter the first low level VGL1.
- the second drive signal input terminal 14 ensures that the switching transistor T3 is in the precharge phase Turned on and turned off during the evaluation phase.
- the synchronization of the second driving signal output terminal 12 with the first driving signal output terminal 11 means that when the first driving signal output terminal 11 outputs a high level, the second driving signal output terminal 12 also outputs a high level when the first driving When the signal output terminal 11 outputs a low level, the second drive signal output terminal 12 also outputs a low level.
- the first drive signal output terminal 11 outputs a high level VGH only during the evaluation phase, so that the second drive signal output terminal 12 also outputs the high level VGH only during the evaluation phase.
- the gate of the first pull-down control transistor T10 is the high level VGH outputted by the second driving signal output terminal 12, so the first pull-down control transistor T10 is turned on, and the drain of the first pull-down control transistor T10
- the potential is the first low level VGL1 to enable the potential of the second terminal b and the third terminal c of the pull-down unit to be pulled down to the first low level VGL1.
- the second pull-down module 13b may further include a second pull-down control transistor T9, and the gate of the second pull-down control transistor ⁇ 9 is connected to the second driving signal output terminal 12,
- the source of the second pull-down control transistor ⁇ 9 is connected to the first low-level input terminal, and the drain of the second pull-down control transistor ⁇ 9 is connected to the first terminal a of the pull-down unit.
- the second driving signal output terminal 12 outputs a high level to the gate of the second pull-down control transistor T9, turns on the second pull-down control transistor T9, and further turns the first end a of the pull-down unit The potential is pulled down to the first low level VGL1.
- the shift register unit further includes a second driving signal output module 15, which includes a second pull-up transistor T5 and a second output pull-down transistor T6, on the second
- the gate of the pull transistor ⁇ 5 is connected to the gate of the first pull-up transistor T1 (the pull-up node PU), the drain of the second pull-up transistor ⁇ 5 is connected to the first clock signal input terminal CLK, and the second pull-up transistor ⁇ 5
- the source is connected to the second driving signal output terminal 12
- the gate of the second output pull-down transistor ⁇ 6 is connected to the gate of the first output pull-down transistor ⁇ 2 (the pull-down node PD)
- the source of the second output pull-down transistor ⁇ 6 is The first low level input is connected, and the second output pull down transistor ⁇ 6 is drained
- the pole is connected to the second drive signal output terminal 12.
- the gate of the second pull-up transistor T5 is connected to the pull-up node PU, and the gate of the second output pull-down transistor T6 is connected to the pull-down node PD. Therefore, in the evaluation phase, the second driving signal output terminal 12 can The high level VGH is output, and in the precharge phase, the reset phase, and the non-operation phase, the second driving signal output terminal 12 can output the first low level VGL1. Therefore, in the precharge phase, the reset phase, and the non-operation phase, the first pull-down control transistor T10 and the second pull-down control transistor T9 are substantially turned off (although there is leakage current, but is small).
- the first pull-down module 13a has the following functions: First, the potential at the pull-down node PD is pulled up in the reset phase, so that the reset transistor T4 is turned on to discharge the pull-up node PU; second, in the shift register unit In the non-working phase, the pull-down node PD is pulled down by the AC, that is, the pull-down node PD can be in an alternating voltage state, avoiding the long-term DC bias causing the transmission curve of the first output pull-down transistor T2 to shift to the right and aging failure, and further Increase the life of the entire shift register unit.
- the shift register unit further includes a second clock signal input terminal CLKB, which is opposite to the first clock signal input terminal CLK,
- a pull-down module 13a includes a third pull-down control transistor T7 and a fourth pull-down control transistor T8.
- the resistance of the fourth pull-down control transistor ⁇ 8 is smaller than the resistance of the third pull-down control transistor ⁇ 7, and the gate and drain of the third pull-down control transistor ⁇ 7 Connected to the second clock signal input terminal CLKB, the source of the third pull-down control transistor ⁇ 7 is connected to the second terminal b, and the gate of the fourth pull-down control transistor ⁇ 8 is connected to the second driving signal input terminal 14, the fourth pull-down control transistor The source of T8 is connected to the second low level input, the drain of the fourth pull-down control transistor T8 is connected to the second end b, and the second end b is connected to the third end c.
- the first clock signal input terminal CLK and the second clock signal input terminal CLKB are opposite to each other, when a high level is input from the first clock signal input terminal CLK, a low level is input from the second clock signal input terminal CLKB, when When a low level is input from the first clock signal input terminal CLK, a high level is input from the second clock signal input terminal CLKB.
- a high level VGH is input through the first driving signal input terminal 10
- a high level VGH is input through the second driving signal input terminal 14, and is input through the first clock signal input terminal CLK.
- the first low level VGL1 is input to the high level VGH through the second clock signal input terminal CLKB.
- the switching transistor T3 is turned on, and charges the PU point of the pull-up node, so that the potential of the pull-up node PU is at a high level VGH.
- the first pull-up transistor T1 and the second pull-up transistor T5 are turned on, first The driving signal input terminal 11 and the second driving signal output terminal 12 both output the first low level VGL1 input by the first clock signal input terminal CLK, and therefore, the first pull-down control transistor T10 and the second pull-down control transistor T9 are substantially turned off.
- the third pull-down control transistor T7 and the fourth pull-down control transistor T8 are both turned on.
- the resistance of the fourth pull-down control transistor T8 is smaller than the resistance of the third pull-down control transistor T7, the potential at the second end b of the pull-down unit is close to the second low level VGL2, due to the second end b and the third end c is connected, so the potential of the third terminal c (ie, the pull-down node PD) is the second low level VGL2. Therefore, the first output pull-down transistor T2 is completely turned off, the reset transistor T4 is substantially turned off, and the charging process can be performed normally.
- a low level is input through the first driving signal input terminal 10
- a first low level VGL1 is input through the second driving signal input terminal 14, through the first clock signal input terminal CLK.
- the high level VGH is input
- the first low level VGL1 is input through the second clock signal input terminal CLKB.
- the potential at the pull-up node PU is coupled higher by the bootstrap capacitor C1, causing the first pull-up transistor T1 and the second pull-up transistor T5 to be turned on, and the first driving signal output terminal 11 and the second driving signal output terminal 12 can output
- the high level VGH, the first pull-down control transistor T10 and the second pull-down control transistor T9 are both turned on because the gate potential is the high level VGH outputted by the second driving signal output terminal 12, and therefore, the third end c (ie The pull-down node PD) and the gate of the switching transistor T3 are both pulled down to the first low level VGL1, thereby causing the first output pull-down transistor T2 and the switching transistor T3 to be completely turned off.
- the third pull-down control transistor T7 and the fourth pull-down control transistor T8 are turned off, and the second end b of the pull-down unit is connected to the third terminal c, so that the potential of the second terminal b and the electrical power of the third terminal c
- the bits are the same, and both are the first low level VGL1, so that the reset transistor T4 is completely turned off. Therefore, in the evaluation phase, the first output pull-down transistor T2, the switching transistor ⁇ 3, and the reset transistor ⁇ 4 are all completely turned off, and there is no leakage phenomenon, so that the pull-up node PU can have a higher potential, ensuring the slave first driving signal.
- the output terminal 11 outputs a sufficiently high level VGH.
- a low level is input through the first driving signal input terminal 10
- a low level is input through the second driving signal input terminal 14
- a first low level VGL1 is input through the first clock signal input terminal CLK, and the second clock is passed.
- the signal input terminal CLKB inputs a high level VGH.
- the second driving signal output terminal 12 outputs a low level, the first pull-down control transistor T10 and the second pull-down control transistor T9 are turned off, the switching transistor T3 is turned off, and the high-level VGH is input from the second clock signal input terminal CLKB, from the second
- the driving signal input terminal 14 inputs the first low level VGL1, the third pull-down control transistor T7 is turned on, and the fourth pull-down control transistor T8 is turned off, so the potential at the second terminal b is at the high level VGH, due to the second end b and the third The terminal c is connected. Therefore, the potential at the third terminal c is also a high level VGH.
- the first output pull-down transistor T2 the second output pull-down transistor ⁇ 6, and the reset transistor ⁇ 4 are both turned on, and the reset transistor ⁇ 4 pairs the pull-up node.
- the PU discharges, the first driving signal output terminal outputs a third low level VGL3, and the second driving signal output terminal outputs a first low level VGL1.
- the third pull-down control transistor T7 is in an alternating state of being turned on and off, that is, the pull-down node PD can be in an alternating voltage state, avoiding a long-term DC bias causing the transmission curve of the first output pull-down transistor T2 to the right.
- the aging fails due to the offset, thereby increasing the service life of the entire shift register unit.
- the first pull-down module 13a includes a third pull-down control transistor T7, a fourth pull-down control transistor ⁇ 8, a fifth pull-down control transistor T11, and a sixth pull-down control transistor ⁇ 12
- the resistance of the fourth pull-down control transistor ⁇ 8 is smaller than the resistance of the third pull-down control transistor ⁇ 7
- the resistance of the sixth pull-down control transistor T12 is smaller than the resistance of the fifth pull-down control transistor T11
- the second clock signal input terminal CLKB is connected
- the source of the third pull-down control transistor T7 is connected to the drain of the fourth pull-down control transistor T8, and the fourth pull-down control
- the gate of the transistor T8 is connected to the second driving signal input terminal 14
- the source of the fourth pull-down control transistor ⁇ 8 is connected to the second low level input terminal
- the drain of the fifth pull-down control transistor T11 is connected to the second clock.
- the signal input terminal CLKB is connected, the gate of the fifth pull-down control transistor T11 is connected to the drain of the fourth pull-down control transistor ⁇ 8, and the source of the fifth pull-down control transistor T11 is connected to the second terminal b of the pull-down unit.
- a gate of the pull-down control transistor T12 is connected to the second driving signal input terminal, a source of the sixth pull-down control transistor T12 is connected to the second low-level input terminal, and a drain of the sixth pull-down control transistor T12 is The second end b of the pull-down unit is connected, and the second end b of the pull-down unit is connected to the third end c of the pull-down unit.
- the structures of the second pull-down module 13b and the second driving signal output module 15 are the same as those in the first embodiment, and the working principle is also the same. Therefore, only the first pull-down module 13a is moved here. The status of each working phase and non-working phase of the bit register unit.
- the third pull-down control transistor T7, the fourth pull-down control transistor ⁇ 8, and the sixth pull-down control transistor T12 are both turned on, because the resistance of the third pull-down control transistor ⁇ 7 is greater than the resistance of the fourth pull-down control transistor ⁇ 8, therefore,
- the gate potential of the five pull-down control transistor T11 is close to the second low level VGL2, and therefore, the fifth pull-down control transistor T11 is substantially turned off, so the drain potential of the sixth pull-down control transistor T12 (ie, the The second terminal b) is the second low level VGL2, so it can be ensured that the first output pull-down transistor T2 is completely turned off during the pre-charging phase to ensure smooth progress of the pre-charging phase.
- the third pull-down control transistor T7, the fourth pull-down control transistor T8, the fifth pull-down control transistor T11, and the sixth pull-down control transistor T12 are all turned off.
- the reset transistor T4 can be turned on to discharge the pull-up node.
- the third pull-down control transistor T7 and the fifth pull-down control transistor T11 are in an alternate state of being turned on and off, that is, the pull-down node PD may be in an alternating voltage state.
- the pull-down node PD may be in an alternating voltage state.
- the first pull-down module 13a may include a seventh pull-down control transistor T13 and a pull-down capacitor C2, and one end of the pull-down capacitor C2 is The second clock signal input terminal CLKB is connected, the other end of the pull-down capacitor C2 is connected to the second terminal b of the pull-down unit, and the gate of the seventh pull-down control transistor T13 is connected to the second driving signal input terminal 14, and the seventh pull-down control
- the source of the transistor T13 is connected to the second low level input terminal
- the drain of the seventh pull-down control transistor T13 is connected to the second end b of the pull-down unit
- the second end b of the pull-down unit is The third end c of the pull-down unit is connected.
- the pull-down capacitor C2 In the pre-charging phase, the pull-down capacitor C2 is charged, and the seventh pull-down control transistor T13 is turned on. Since the resistance of the pull-down capacitor C2 is greater than the resistance of the seventh pull-down control transistor T13, the potential at the second end b of the pull-down unit is close. The second low level VGL2.
- the seventh pull-down control transistor T13 is turned off, and the pull-down capacitor C2 stops charging.
- the seventh pull-down control transistor T13 is turned off, and the pull-down capacitor C2 is charged, so that the potential at the second terminal b of the pull-down unit is at a high level VGH, causing the reset transistor T4 to be turned on to discharge the pull-up node PU.
- the seventh pull-down control transistor T13 is turned off, and the pull-down capacitor C2 is alternately in a state of being charged and de-energized, thereby performing an AC pull-down on the pull-down node PD.
- At least one of the first pull-up transistor T1, the first output pull-down transistor ⁇ 2, the switching transistor ⁇ 3, and the reset transistor ⁇ 4 may be a depletion transistor.
- the first pull-up transistor T1, the first output pull-down transistor ⁇ 2, the switching transistor ⁇ 3, and the reset transistor ⁇ 4 may each be a depletion transistor. The advantages of the depletion transistor have been described in the background art and will not be described again here.
- the first pull-up transistor T1, the first output pull-down transistor ⁇ 2, the switching transistor ⁇ 3, and the reset transistor ⁇ 4 are all ⁇ channel thin film transistors.
- a shift register comprising a multi-stage shift register unit, wherein the shift register unit is the above-mentioned shift provided by the present invention a bit register unit, a first drive signal input terminal 10(n) of the shift register unit of the next stage and a first drive of the shift register unit of the previous stage
- the signal output terminal 11 (n-1) is connected.
- n represents a natural number.
- 10 (1) represents the first drive signal input end of the first stage shift register unit
- 11 (1) represents the first drive signal output end of the first stage shift register unit
- 10 (n-1) represents the first drive signal input terminal of the (n-1)th stage shift register unit
- 11 (n-1) represents the first stage of the (n-1)th stage shift register unit.
- the driving signal output terminal, 10 (n) represents the first driving signal input end of the nth stage shift register unit
- 11 (n) represents the first driving signal output end of the nth stage shift register unit
- V Dd and V ss represent the positive and negative terminals of the power supply for the shift register unit, respectively.
- the shift register unit includes the second drive signal output module, the second drive signal output terminal 12 (n-1) of the upper stage shift register unit and the second drive signal input of the next stage shift register unit End 14 (n) is connected.
- 14 (1) represents the second drive signal input terminal of the first stage shift register unit, and 12 (1) represents the second drive signal output terminal of the first stage shift register unit; 14 (n-1) a second drive signal input terminal representing the (n-1)th stage shift register unit, 12 (n-1) representing a second drive signal output terminal of the (n-1)th stage shift register unit; n) represents a second drive signal input terminal of the nth stage shift register unit, and 12(n) represents a second drive signal output terminal of the nth stage shift register unit.
- a depletion transistor can be applied to the shift register provided by the present invention.
- a gate driver including the above shift register.
- a display panel including a thin film transistor, a data line, a gate line, and a gate driver electrically connected to the gate line, wherein the gate driver is provided by the present invention
- the gate driver is provided by the present invention
- a driving signal output end of the gate driver is connected to the gate line.
- the display panel may include a plurality of gate lines and a plurality of data lines, the plurality of data lines and the plurality of gate lines intersect to form a plurality of pixel units, and each of the pixel units is provided with a thin film transistor
- Each of the shift register units in the shift register of the gate driver is connected to a gate line, and the thin film transistor is turned on by supplying a high level VGH to the gate line.
- the first pull-up transistor T1, the first output pull-down transistor ⁇ 2, the switching transistor ⁇ 3, and the reset transistor ⁇ 4 used by the shift register unit in the shift register of the gate driver may be depletion type Transistor. The advantages of the depletion transistor have been described in the background art and will not be described again here.
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- Engineering & Computer Science (AREA)
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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Shift Register Type Memory (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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Abstract
Description
Claims
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US14/379,091 US9396813B2 (en) | 2013-08-09 | 2013-12-05 | Shift register cell, shift register, gate driver and display panel |
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CN201310346888.XA CN103440839B (zh) | 2013-08-09 | 2013-08-09 | 移位寄存单元、移位寄存器和显示装置 |
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Also Published As
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CN103440839B (zh) | 2016-03-23 |
US20150294733A1 (en) | 2015-10-15 |
CN103440839A (zh) | 2013-12-11 |
US9396813B2 (en) | 2016-07-19 |
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