WO2015014149A1 - 移位寄存器单元及其驱动方法、移位寄存器和显示装置 - Google Patents
移位寄存器单元及其驱动方法、移位寄存器和显示装置 Download PDFInfo
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- WO2015014149A1 WO2015014149A1 PCT/CN2014/077980 CN2014077980W WO2015014149A1 WO 2015014149 A1 WO2015014149 A1 WO 2015014149A1 CN 2014077980 W CN2014077980 W CN 2014077980W WO 2015014149 A1 WO2015014149 A1 WO 2015014149A1
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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
- G11C19/28—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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3266—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
- G09G2300/08—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
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
-
- 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
- Embodiments of the present invention relate to the field of organic light emitting display, and in particular, to a shift register unit and a driving method thereof, a shift register, and a display device. Background technique
- the scan line of each row and the data line of each column intersect to form an active matrix.
- the method of progressive scanning is used to sequentially open the gate of each row and write the voltage on the data line to the pixel. Integrating the line scan driving circuit on the display backplane has the advantages of narrow edge and low cost. It has been used in most LCD (Liquid Crystal Display) / AMOLED (Active Matrix/Organic Light Emitting Diode). Diode) is used in display devices.
- a-Si amorphous silicon
- LTPS Low Temperature Poly-silicon
- Oxide oxide
- TFT Thin Film Transistor
- Oxide TFTs have high mobility, good uniformity, and low cost, and are the most suitable technology for large-size panel display in the future, but the current-voltage (IV) transfer characteristics of oxide TFTs are usually depletion type, that is, oxide TFTs.
- Vgs gate-source voltage
- Fig. 1A is a structural diagram of a conventional shift register. All of the transistors in Figure 1A are n-type thin film transistors. As shown in FIG. 1A, a conventional shift register includes a first output transistor T1, a second output transistor ⁇ 2, a first control module 11 that controls T1, and a second control module 12 that controls ⁇ 2. Except for the shift register of the last stage, the output of each shift register is connected to the input of the shift register of the next stage, and alternately passes through two clock signals CLK1 with a duty ratio of 50%. Controlled by CLK2. All input and control signal amplitudes are VGL ⁇ VGH.
- VGL is low and VGH is high.
- the first output transistor T1 is connected to the clock signal CLKB and the output terminal 0171 1:) to function as a high level.
- the second output transistor ⁇ 2 is connected to the low-level output terminal of the output low-level VGL and the output terminal ⁇ ⁇ ), and functions to transmit a low level.
- the operation of the shift register can be divided into the following three stages.
- the first stage is the pre-charging stage.
- the output of the current stage shift register ⁇ ⁇ - ⁇ When the output of the current stage shift register ⁇ ⁇ - ⁇ ) generates a high-level pulse, it controls the PU point (the node connected to the gate of the transistor T1, that is, the pull-up node). It is charged to the high level VGH while the PD point (the node connected to the gate of the transistor T2, that is, the pull-down node) is controlled to be discharged to the low level VGL.
- the transistor T1 is turned on, the low level of CLKB is transmitted to the output terminal OUT(n), and the transistor T2 is turned off.
- the second phase is the evaluation phase.
- the PU point becomes floating, that is, the transistors of the first output control module connected thereto are turned off, and no signal comes.
- CLKB changes from low level to high level.
- the PU point voltage is bootstrapped to a higher level by the capacitor connected between the gate of transistor T1 and the output terminal OUT n). It is guaranteed that there is no threshold loss in the output voltage of the output terminal OUT).
- the PD point is kept low, and the transistor ⁇ 2 is turned off to prevent the high level of the output terminal OUT( n ) from leaking through ⁇ 2.
- the third phase is the reset phase, that is, the next clock cycle, CLKB goes low, CLK goes high, the PU point is discharged to a low level, and the PD point is recharged to a high level.
- the transistor T1 is turned off, the transistor T2 is turned on, and the output voltage of the output terminal OUT(n) is kept low through the transistor T2.
- the PU point and the PD point form a reciprocal relationship, thereby avoiding the transistor T1 and
- T2 is simultaneously turned on to cause an output abnormality.
- transistors T1 and T2 in Figure 1A are depletion transistors, the output will produce large distortion.
- the PU point voltage is at a high level to turn on the transistor T1, and the PD point voltage is discharged to the low level VGL.
- the Vgs of the transistor T2 is 0. It still cannot be shut down normally, and leakage current is generated. That is to say, when transistors T1 and T2 are turned on at the same time, the high level of the output of output terminal OUT( n ) depends on the voltage division of the resistors of transistors T1 and ⁇ 2, which is usually much lower than the normally required high level.
- the depletion mode TFT tube in the internal control circuit also causes output failure.
- the:::::: control module is a pull-down pipe control module
- the first control module includes transistors ⁇ 3 and ⁇ 4.
- the transistors ⁇ 3 and ⁇ 4 are depletion transistors in which the transistor ⁇ 3 is connected to the output terminal OUT(n-1) of the upper stage shift register and the PU point (node connected to the gate of T1).
- the role of transistor T3 is to charge the PU point voltage to a high level during the precharge phase.
- the gate of the transistor T4 is connected to the reset signal Rst.
- Transistor T4 is connected to a low level output that connects the PU point to the output low level VGL.
- the role of transistor T4 is to pull the PU point voltage low during the reset phase.
- the depletion transistors T3 and T4 are turned on during the evaluation phase, pulling the PU point voltage low.
- the transistor T1 is not fully turned on, affecting the high level of the output of the output terminal OUT( n ), as shown by the broken line in FIG.
- a main object of an embodiment of the present invention is to provide a shift register unit and a driving method thereof, a shift register and a display device, which solve the influence of a DC bias voltage on a TFT characteristic inside a shift register unit, and a shift register.
- the problem of erroneous output caused by the TFT inside the cell being unable to be completely turned off.
- an embodiment of the present invention provides a shift register unit, including: a first control module, configured to transmit a start signal to a first node;
- a second control module configured to pull a potential of the second node to a potential different from a potential of the first node under the control of the first clock signal
- a carry output module configured to output a carry signal according to a potential of the first node and a potential of the second node
- a shift output module configured to output a shift signal according to a potential of the first node and a potential of the second node.
- the shift register unit in the embodiment of the present invention further includes:
- an output feedback module configured to maintain a potential of the first node by controlling the first control module according to the carry signal and the shift signal.
- the shift register unit in the embodiment of the present invention further includes:
- a reset module configured to control the reset of the shift signal.
- the carry output module comprises a first carry output transistor and a second carry output transistor.
- a gate of the first carry output transistor is connected to the first node, a first pole of the first carry output transistor is connected to the carry signal output end, and a second pole of the first carry output transistor Connected to the second clock signal output terminal;
- a gate of the second carry output transistor is connected to the second node, a first pole of the second carry output transistor is connected to a first low level output terminal, and a second pole of the second carry output transistor Connected to the carry signal output end;
- a bootstrap capacitor is connected between the shed-pole and the first pole of the first carry output transistor.
- the shift output module comprises a first shift output transistor and a second shift output transistor.
- a gate of the first shift output transistor is connected to the first node, a first pole of the first shift output transistor is connected to the shift signal output end, and the first shift output transistor is The second pole is connected to the second clock signal output end;
- a gate of the second shift output transistor is connected to the second node, a first pole of the second shift output transistor is connected to a second low level output terminal, and the second shift output transistor is The second pole is connected to the shift signal output.
- the first carry output transistor, the second carry output transistor, the first shift output transistor, and/or the second shift output transistor are depletion thin film transistors; a threshold voltage of the carry output transistor, a threshold of the second carry output transistor The voltage, the threshold voltage of the first shift output transistor, and the threshold voltage of the second shift output transistor are both the depletion threshold voltage.
- the first low level is smaller than the first::::: low level, and an absolute value of a difference between the first low level and the second low level is greater than The absolute value of the threshold voltage is exhausted.
- the first control module includes a first control transistor, a:::::: control transistor, a third control transistor, and a fourth control transistor.
- a gate of the first control transistor is connected to the first clock signal output end, and a first pole of the first control transistor and a second pole of the output feedback module and the second control transistor respectively Connecting, the second pole of the first control transistor is connected to the start signal input end;
- a gate of the second control transistor is connected to the first clock signal output terminal, and a first pole of the first control transistor is connected to the first node;
- a gate of the third control transistor is connected to the second node, and a first pole of the third control transistor is respectively connected to a:::::: pole of the fourth control transistor and the output feedback module And the second pole of the third control transistor is connected to the first node;
- the sector of the fourth control transistor is coupled to the second node, and the first pole of the fourth control transistor is coupled to the first low level output.
- the second control module includes a fifth control transistor, a sixth control transistor, and a holding capacitor;
- a slab-pole of the fifth control transistor is connected to the first clock signal output terminal, a first pole of the fifth control transistor is connected to the second node, and a second pole of the fifth control transistor Connected to the first clock signal output end;
- a sixth pole of the sixth control transistor is connected to the first node, a first pole of the sixth control transistor is connected to the first low level output terminal, and a second pole of the sixth control transistor is a first pole connection of the fifth control transistor;
- the holding capacitor is connected between the second node and the second low level output.
- the output feedback module includes a feedback transistor
- the reset module includes a reset transistor
- a gate of the reset transistor is connected to the reset signal input terminal, a first pole of the reset transistor is connected to the first:::::::low level output terminal, and a portion of the reset transistor: The ::::: pole is connected to the shift signal output.
- the embodiment of the present invention further provides a driving method of a shift register unit, which is applied to the above shift register unit, and the driving method of the shift register unit includes the following steps:
- the first control module transmits the start signal to the first node, and the second control module pulls the potential of the second node to be opposite to the potential of the first node under the control of the first clock signal.
- the second control module pulls the potential of the second node to a potential inverted from the potential of the first node at the control of the first clock signal, the carry output module according to the first node a potential and a potential of the second node output a carry signal; the shift output module outputs a shift signal according to a potential of the first node and a potential of the first::::: node.
- the driving method of the shift register unit according to the embodiment of the present invention further includes: in a pre-charging stage, the output feedback module controls the first control module according to the carry signal and the shift signal The potential of the first node is maintained.
- the driving method of the shift register unit in the embodiment of the present invention further includes: in the resetting phase, the reset module controls the resetting of the shift signal.
- the embodiment of the invention further provides a shift register comprising a plurality of stages of the above shift register unit;
- the start input of each stage of the shift register unit is coupled to the carry signal output of the shift register unit of the previous stage.
- the embodiment of the invention further provides a display device comprising the above shift register.
- the shift register unit, the shift register and the display device use the first clock signal of the alternating current instead of the high voltage signal to control the second control module, which can reduce the DC offset.
- the design of the two output terminals makes the TFT inside the shift register unit completely closed. Close, avoid erroneous output.
- 1A is a circuit diagram of a conventional shift register
- 1B is a timing diagram of signals of a conventional shift register during operation
- FIG. 1C is a schematic diagram of an output waveform of an output terminal OUT (n) of a conventional shift register
- FIG. 2A is a circuit diagram of a specific embodiment of a conventional shift register
- 2B is a timing diagram of signals in a working embodiment of a conventional shift register
- FIG. 3 is a structural block diagram of a shift register unit according to an embodiment of the present invention.
- FIG. 4A is a structural block diagram of a shift register unit according to another embodiment of the present invention
- FIG. 4B is a structural block diagram of a shift register unit according to still another embodiment of the present invention
- FIG. 5A, FIG. 5B, FIG. 5D and FIG. 5E are respectively circuit diagrams of a shift register unit according to an embodiment of the present invention
- FIG. 6 is a structural block diagram of a specific embodiment of a shift register unit according to an embodiment of the present invention.
- FIG. 6A is a circuit diagram of a shift register unit according to the embodiment of the present invention
- FIG. 6B is a timing diagram of signals in a shift register unit according to the embodiment of the present invention
- FIG. 7 is a circuit diagram of a shift register according to an embodiment of the present invention. detailed description
- the transistors employed in all embodiments of the present invention may each be a thin film transistor or a field effect transistor or other device having the same characteristics.
- one of the poles is referred to as a source and the other pole is referred to as a drain.
- the transistor can be classified into an N-type transistor or a P-type transistor according to the characteristics of the transistor.
- the driving circuit provided by the embodiment of the present invention all of the transistors are described by taking an N-type transistor as an example. It is conceivable that when the P-type transistor is implemented, those skilled in the art can do without creative work. It is also conceivable that it is also within the scope of the embodiments of the invention.
- the driving circuit provided by the embodiment of the present invention, all transistors are described by taking an N-type transistor as an example.
- the first pole of the N-type transistor may be the source, and the second pole of the N-type transistor may be the drain. It is conceivable that the implementation of the P-type transistor is easily conceivable by those skilled in the art without creative efforts, and is therefore within the scope of the embodiments of the present invention.
- the shift register unit of the embodiment of the present invention includes:
- the first control module 31 is configured to transmit the start signal to the first node Q1;
- a second control module 32 configured to be under the control of the first clock signal CLK, of the second node Q2 The potential is pulled to a different potential than the first node Q1;
- a carry output module 33 configured to output a carry signal according to a potential of the first node Q1 and a potential of the second node Q2;
- the shift output module 34 is configured to output a shift signal according to the potential of the first node Q1 and the potential of the second node Q2.
- the start signal is input from the start signal input terminal STV, the carry signal is output from the carry signal output terminal OUT-C (n), and the shift signal is output from the shift signal output terminal OUT (n).
- the shift register unit of the embodiment of the present invention controls the second control module 32 by using the first clock signal CLK of the alternating current instead of the high voltage signal, thereby reducing the DC bias voltage for the TFT characteristics inside the shift register unit. influences.
- the shift register unit described in the embodiment of the present invention adopts a design of two output terminals, so that the TFT inside the shift register unit can be completely turned off to avoid erroneous output.
- the first control module 31 transmits the start signal to the first node Q1 in response to the first clock signal CLK.
- the shift register unit of the embodiment of the present invention further includes:
- the output feedback module 35 is configured to maintain the potential of the first node Q1 by controlling the first control module 31 according to the carry signal and the shift signal.
- the first control module 31 transmits a start signal to the first node Q1, and the second control module 32 pulls the potential of the second node Q2 to the first node under the control of the first clock signal CLK.
- the potential of Q1 inversion is the potential of Q1 inversion.
- the first control module 31 maintains the potential of the first node Q1
- the second control module 32 pulls the potential of the second node Q2 to the first node Q1 under the control of the first clock signal CLK. Inverted potential.
- the carry output module 3 outputs a carry signal according to the potential of the first node Q1 and the potential of the second node Q2, and the shift output module 34 is based on the potential of the first node Q1 and the second node Q2. The potential output shifts the signal.
- the shift register unit of the embodiment of the present invention further includes:
- the reset module 36 is configured to control the reset of the shift signal.
- the reset signal is input by a reset signal input terminal RST.
- the reset module when the shift register unit according to the embodiment of the present invention as shown in FIG. 4B is in operation, there is a reset phase after the precharge phase and the evaluation phase, and in the reset phase, the reset module
- the carry output module 33 includes:
- a first carry output transistor T331 the gate is connected to the first node Q1, the first pole is connected to the carry signal, and the second pole is connected to the second clock signal CLKB;
- the second carry output transistor ⁇ 332 has a gate connected to the first:::::: node Q2, a first pole connected to the first low level LVGL, and a second pole outputting the carry signal.
- a bootstrap capacitor is connected between the gate of the first carry output transistor and the first pole
- the shift output module 34 includes:
- a first shift output transistor T341 the gate is connected to the first node Q1, the first pole outputs the shift signal, and the second pole is connected to the second clock signal CLKB;
- the second shift output transistor ⁇ 342, the » pole is connected to the second node Q2, the first pole is connected to the second low level VGL, and the second pole outputs the shift signal.
- the first carry output transistor T331, the second carry output transistor 332, the first shift output transistor T341, and/or the second shift output transistor ⁇ 342 may be depleted.
- the first low level LVGL is smaller than the second low level VGL, and an absolute value of a difference between the first low level LVGL and the second low level VGL is greater than the depletion threshold voltage The absolute value, thereby avoiding the influence of the leakage current problem of the depletion mode TFT on the drive signal of the shift register unit.
- the shift register unit employs two stages of outputs, namely a carry output module 33 and a shift output module 34.
- a carry output module 33 By classifying the carry signal and the shift signal, the shift signal is maintained at a high level during the evaluation phase, thereby solving the leakage current of the depletion TFT The effect of the shift signal on the shift register unit.
- the shift register unit maintains the level of the first node Q1 through the output feedback module 35 during the evaluation phase to maintain the level of the shift signal, thereby The first node Q1 is prevented from depleting conduction leakage through the internal TFT during the evaluation phase, which affects the output.
- the first control module 31 includes a first control transistor T311, a second control transistor 312, a third control transistor T313, and a fourth control transistor 314.
- the first control transistor ⁇ 311 has a gate connected to the first clock signal CLK, and a first pole is respectively connected to the output feedback module 35 and the ::::: pole of the second control transistor T312.
- the :: two poles access the start signal.
- the third control transistor T313 has a gate connected to the first ::::: node Q2, and a first pole connected to the second pole of the fourth control transistor T314 and the output feedback module 35, respectively.
- the two poles are connected to the first node Q1.
- the fourth control transistor T314, the » pole is connected to the second node Q2, and the first pole is connected to the first low level LVGL.
- the second control module 32 includes a fifth control transistor T325, a sixth control transistor ⁇ 326, and a holding capacitor C2.
- the fifth control transistor T325 has a gate connected to the first clock signal CLK, a first pole connected to the second node Q2, and a second pole connected to the first clock signal CLK.
- the sixth control transistor T326, the » pole is connected to the first node Q1, the first pole is connected to the first low level LVGL, and the second pole is connected to the first pole of the fifth control transistor ⁇ 325.
- the holding capacitor C2 is connectable between the second node Q2 and the second low level output.
- a second low level VGL can be input from the second low level output.
- the FD point is a node to which the output feedback module 35 is connected to the first control module 31.
- the output feedback module 35 includes a feedback transistor T35.
- the feedback transistor ⁇ 35, the pole is connected to the carry signal, and the first pole is connected to the shift signal No., the ::::: pole is respectively connected to the first pole of the first control transistor T311 and the first pole of the third control transistor T313.
- the reset module 36 includes a reset transistor T36.
- the reset transistor ⁇ 36 has a gate connected to the reset signal input terminal RST, and a first pole connected to the first:::::: low level output terminal, the second pole and the shift signal output end OUT (n) connection.
- the first control module 31 includes a first transistor T311, a second transistor 312, a third transistor T313, and a fourth transistor 314.
- the second control module 32 includes a fifth transistor ⁇ 325, a sixth transistor ⁇ 326, and a seventh transistor ⁇ 327.
- the first transistor T311 has a gate connected to the :::::clock signal CLKB, and the first pole is respectively connected to the second pole of the output feedback module 35 and the second transistor T312, and the second pole is The start signal input terminal STV is connected.
- the second transistor T312 has a gate connected to the second clock signal CLKB, and the first pole is connected to the first control node Q1.
- the third transistor T313 has a gate connected to the second control node Q2, a first electrode connected to the second electrode of the fourth transistor T314, and a second electrode connected to the gate of the fifth transistor 325.
- the fourth transistor ⁇ 314 has a gate connected to the gate of the second carry output thin film transistor ⁇ 2, and a source connected to the first low level output terminal.
- the fifth transistor ⁇ 325 has a gate connected to the first control node Q1, a first pole connected to the second pole of the sixth transistor 326, and a second pole connected to the gate of the sixth transistor 326.
- the sixth transistor ⁇ 326 has a gate connected to the first control node Q1, and a first pole connected to the first low level output terminal.
- the seventh transistor ⁇ 327, the gate and the second pole are connected to the first clock signal CLK, and the first pole is connected to the second control node Q2.
- a first low level LVGL is input from the first low level output terminal.
- the shift register unit includes:
- the first control module 61 is respectively connected to the first node Q1, the second node Q2, and the first clock signal
- the output terminal is connected to the first low level output terminal for pulling the potential of the first node Q1 to a high level in a precharge phase, and the first node is in a reset phase
- the potential of Q1 is pulled low to a low level
- a second control module 62 respectively, with the second node Q2, the first node Q1, H', a clock signal output terminal, the first low-level output terminal, and the second: low-level output terminal Connecting, for pulling the potential of the first node to a low level during a pre-charging phase, and stepping down the potential of the first node Q1 to a first low level LVGL in an evaluation phase, and Pulling the potential of the first node Q1 to a high level in a reset phase;
- the carry output module 63 is respectively connected to the first node Q1, the second node Q2, the second clock signal output terminal, the first low level output terminal, and the carry signal output terminal OUT_C(n). Controlling the carry signal output terminal OUT_C(n) to output a first low level LVGL in a precharge phase, outputting a high level in the evaluation phase, and outputting a first low level LVGL in the reset phase;
- the shift output module 64 is respectively connected to the first node Q1, the second node Q2, the second low level output end, and the shift signal output end OUT(n) for controlling the shift
- the bit signal output terminal OUT (n) outputs a second low level VGL in the precharge phase, and outputs a high level in the evaluation phase;
- the output feedback module 65 is respectively connected to the carry signal output terminal OUT_C (n), the shift signal output terminal OUT (n) and the first control module 61, and is used to pass through the control center during the evaluation phase.
- the first control module 61 is configured to maintain the potential of the first node Q1 at a high level;
- the reset module 66 is connected to the reset signal input terminal RST, the second low level output terminal and the shift output signal output terminal OUT (n) for controlling the shift signal output terminal OUT (n) in the reset phase
- the second low level VGL is output.
- the first level input terminal inputs a first low level LVGL
- the second level input terminal inputs a second low level VGL.
- the start signal input terminal inputs a start signal RST
- the reset signal input terminal inputs a reset signal RST.
- the first clock signal input terminal inputs a first clock signal CLK
- the second clock signal input terminal inputs a second clock signal CLKB.
- CLK and CLKB are inverted.
- the first low level LVGL and the second low level VGL are different.
- the first low level LVGL is smaller than the second low level VGL.
- the The embodiment uses two output terminals (carry signal output terminal and shift signal output terminal) to form a negative voltage difference between the gate voltage and the source voltage of the TFT inside the shift register unit, so that the shift register unit is internal.
- the TFT can be completely turned off. This avoids erroneous output and thus avoids the influence of the leakage current problem of the TFT on the drive signal of the shift register unit.
- this embodiment replaces the high voltage signal in the conventional circuit with the first clock signal of the alternating current to control the .::::::::: control module 62 to reduce the influence of the DC bias voltage on the characteristics of the TFT.
- This embodiment of the present invention uses two clock signals (a first clock signal CLK and a .::::clock signal CLKB) to control the shift register unit of the embodiment of the present invention, which makes the control more flexible and precise.
- the carry output module 63 includes a first carry output transistor T631 and a second carry output transistor T632.
- the first carry output transistor T631 has a gate connected to the first node Q1, and a first pole connected to the carry signal output terminal OUT_C(n), a ::::: pole and the first .::::: The clock signal output is connected.
- the second carry output transistor T632, the » pole is connected to the second node Q2, the first pole is connected to the first low level output, and the second pole is connected to the carry signal output terminal OUT-C (n ) Connect.
- the shift output module 64 includes a first shift output transistor T641 and a second shift output transistor T642.
- the first shift output transistor ⁇ 641 has a gate connected to the first node Q1, a first pole connected to the shift signal output terminal OUT(n), and a second pole and the second clock signal output end connection.
- the second shift output transistor T642, the » pole is connected to the second node Q2, the first pole is connected to the second low level output terminal, and the second pole is connected to the shift signal output terminal OUT (n ) Connect.
- the first carry output transistor T641, the second carry output transistor ⁇ 642, the first shift output transistor T651, and/or the second shift output transistor ⁇ 652 are depletion thin film transistors.
- the first shift output transistor T651 and the second shift output transistor T652 are both depletion thin film transistors.
- the threshold voltage of the first carry output thin film transistor T631, the threshold voltage of the second carry output thin film transistor T632, the first The threshold voltage of the shift output transistor T641 is the same as the threshold voltage of the first:::::shift output transistor T642, and both are depletion threshold voltages.
- the first low level LVGL is smaller than the first::::::low level VGL, and the absolute value of the difference between the first low level LVGL and the second low level VGL is greater than Describe the absolute value of the depletion threshold voltage.
- the first control module 61 includes a first pull-up transistor T611, a second pull-up transistor 612, a third pull-up transistor ⁇ 613, a fourth pull-up transistor T614, and a bootstrap capacitor C1. .
- the first pull-up transistor T611 has a gate connected to the first clock signal output end, and a first pole connected to the second electrode of the output feedback module 65 and the second pull-up transistor T612, respectively.
- the pole is connected to the start signal input.
- the second pull-up transistor ⁇ 612 has a gate connected to the first clock signal output terminal, and a first pole connected to the first node Q1.
- the third pull-up transistor ⁇ 613, the pole is connected to the second node Q2, and the first pole is respectively connected to the second pole of the output feedback module 65 and the fourth pull-up transistor T614, and the second pole is The first node Q1 is connected.
- the fourth pull-up transistor T614, the » pole is connected to the second node Q2, and the first pole is connected to the first low-level output.
- the bootstrap capacitor C1 is connected between the first node Q1 and the carry signal output terminal OUT C ( ⁇ ).
- the second control module 62 includes a first pull-down transistor ⁇ 621, a second pull-down transistor 622, and a holding capacitor C2.
- the first pull-down transistor T621 has a gate connected to the first clock signal output terminal, a first pole connected to the second node Q2, and a second pole connected to the first clock signal output end.
- the second pull-down transistor T622, the » pole is connected to the first node Q1, the first pole and the The first low level output is connected, and the second pole is connected to the first pole of the first pull-down transistor T21.
- the holding capacitor C2 may be connected between the second node Q2 and the second low level output terminal.
- the output feedback module 65 includes a feedback transistor T65.
- the feedback transistor ⁇ 65 has a gate connected to the carry signal output terminal OUT_C(n), a first pole connected to the shift signal output terminal OUT(n), and a second pole respectively connected to the first
- the first pole of the pull-up transistor T611 is connected to the first pole of the third pull-up transistor T613.
- the FD point is a node connected between the second pole of the feedback transistor T65 and the first pole of the first pull-up transistor T611.
- the reset module 66 includes a reset transistor T66;
- the reset transistor T66 has a gate connected to the reset signal input terminal RST, a first pole connected to the second low level output terminal, and a second pole connected to the shift signal output terminal OUT (n).
- the transistors employed in the embodiments of the present invention are both depletion mode thin film transistors.
- the shift register unit according to the embodiment of the present invention uses the same type of depletion thin film transistor.
- the transistors used in the shift register unit according to the embodiment of the present invention are all N-type depletion thin film transistors or P-type depletion thin film transistors.
- the working process of the shift register unit according to the embodiment of the present invention is divided into the following three stages.
- the first phase is the precharge phase S1
- CLK is high level VGH
- CLKB is the first low level LVGL
- the high level VGH is input from the start signal input terminal STV
- the reset signal input terminal RST is input to the first low level.
- LVGL is the precharge phase S1
- CLK is high level VGH
- CLKB is the first low level LVGL
- the high level VGH is input from the start signal input terminal STV
- the reset signal input terminal RST is input to the first low level.
- the transistors T611, T612, T621 are turned on, and the Q1 point (the node connected to the » pole of the carry output transistor and the » terminal of the shift output transistor) gradually rises (less than the high level VGH), through the Q1 point pair.
- C1 is charged
- transistor T622 is turned on
- voltage at point Q2 is gradually decreased (less than LVGL).
- the transistors T632, ⁇ 614, and 642 are turned on, and the transistor T613 is turned on at the beginning of the precharge phase S1.
- the FD point voltage is the same as the Q1 point voltage.
- the transistor T613 is then turned off.
- transistors T631 and T641 turn on, and transistors ⁇ 66 and ⁇ 65 turn off.
- the start signal STV passes through the turned-on transistor T611 and T612 charges CI, so that the voltage at Q1 gradually increases (but the voltage at Q1 is still lower than VGH), and the voltage at Q2 gradually decreases (but the voltage at Q2 is still higher than LVGL).
- the transistors T631, T632, T641, and 642 are both turned on, whereby OUT (n) outputs VGL, and OUT - C (n) outputs LVGL.
- the second phase is the evaluation phase S2
- CLK is the first low level LVGL
- CLKB is high level VGH
- the first low level LVGL is input from the start signal input terminal STV
- the first low level LVGL is input to the reset signal input end.
- Transistors T631 and T641 are turned on, OUT (n) outputs a high level VGH, and OUT-C (n) outputs a high level VGH.
- Transistors T611 and T612 are turned off.
- Transistor ⁇ 622 is turned on and transistor T621 is turned off.
- the Q2 point potential continues to drop to LVGL.
- Transistor T613 and transistor T614 are also turned off.
- Transistor T632 is turned off and transistor T642 is turned off.
- the potential at the FD point gradually rises (less than VGH). Therefore, the Q1 point is in a floating state (ie, the transistors T612 and T613 connected to the Q1 point are turned off, no signal comes), and the Q1 point voltage is bootstrapped by the bootstrap capacitor C1 to a higher level, Q1 point. The voltage continues to rise, thereby ensuring that there is no threshold loss in the output voltage of OUT(n).
- the third stage is the reset stage S3,
- Reset signal input terminal RST input high level VGH
- CLKB is low level LVGL
- CLK is high level VGH
- start signal input terminal STV input first low level LVGL.
- the transistors T611 and T612 are turned on, and since the potential of the CLK is high, the transistor T621 is turned on, so that the potential of the Q2 point is high, the transistors T613 and T614 are turned on, and the potential of the Q1 point is pulled down to LVGL.
- Transistor T621 is turned on, and the voltage at point Q1 goes low, so that transistors T631 and T641 are turned off.
- the transistor T622 is turned on, and as the voltage at the Q1 point drops to a low level, the transistor T622 is turned off. Since the transistor T622 is a depletion type TFT, the current flowing through the transistor T622 is small, and since the voltage of C2 is maintained, the potential of the Q2 point can be maintained at a high level.
- the transistors T32 and T42 are fully turned on, and At this time, the RST output is high, the transistor T66 is fully turned on, OUT_C (n) outputs LVGL, OUT (n) outputs VGL, and the transistor T65 is turned off.
- the shift register unit divides the output into two stages, that is, a carry output module and a shift output module.
- the carry output module and the shift output module are driven by the first low level LVGL and the second low level VGL, respectively.
- the first low level LVGL and the second low level VGL are different, thereby avoiding the influence of the leakage current generated by the transistors T41 and ⁇ 42 being depleted on the output.
- the embodiment of the present invention controls the internal node through the feedback transistor ⁇ 65 to prevent the Q1 point from depleting conduction leakage through the internal TFT during the evaluation phase, thereby affecting the output.
- the gate-source control voltage of the feedback transistor ⁇ 65 is controlled by different low-level voltages, respectively, to avoid the inverse effect of the internal node potential change on the output. Since the transistors ⁇ 31 and ⁇ 32 drive only the carry output, the size does not need to be large.
- the driving method of the shift register unit according to the embodiment of the present invention is applied to the shift register unit described above, and includes the following steps:
- the first control module transmits the start signal to the first node, and the second control module pulls the potential of the second node to be opposite to the potential of the first node under the control of the first clock signal.
- the second control module pulls the potential of the second node to a potential inverted from the potential of the first node under the control of the first clock signal, and the carry output module is configured according to the potential of the first node
- the potential of the second node outputs a carry signal;
- the shift output module outputs a shift signal according to the potential of the first node and the potential of the second node.
- the driving method of the shift register unit according to the embodiment of the present invention further includes: in a pre-charging stage, the output feedback module controls the first control module according to the carry signal and the shift signal The potential of the first node is maintained.
- the embodiment of the invention further provides a shift register, which comprises the above shift register unit;
- the start signal input of each stage of the shift register unit is connected to the carry signal output of the shift register unit of the previous stage.
- the first embodiment of the shift register according to the embodiment of the present invention is composed of a step shift register unit connected as a row scanner of an active matrix, and ⁇ is usually the number of rows of the active matrix. , ⁇ is a positive integer.
- Sl, S2, ..., Sn, ..., SN are respectively labeled as a first stage shift register unit, a second stage shift register unit, an nth stage shift register unit, and an Nth stage shift register. unit.
- Each shift register unit is respectively connected to the first clock signal output terminal, the ::::: clock signal output terminal, the first low level output terminal and the second low level output terminal.
- the clock signal outputted from the first clock signal output terminal and the clock signal outputted from the second clock signal output terminal are opposite in phase, and the duty ratio is, for example, 50%, respectively, but is not limited thereto.
- the start signal input terminal STV of the first stage shift register is connected to the initial pulse signal Start, and the initial pulse signal IN is active high.
- each stage shift register unit In addition to the first stage shift register unit, the start signal input of each stage shift register unit is coupled to the carry signal output of the upper shift register unit.
- Each-stage shift register has two outputs, that is, OUT-C (n) is the carry signal output terminal, which is connected to the start signal input terminal STV of the next-stage shift register unit; OUT (n) is the drive signal The output terminal is connected to the row scanning line Gn of the active matrix.
- n is a positive integer and n is less than or equal to N.
- the clock control signals of the adjacent two-stage shift register units are inverted with each other. For example, if the first clock input terminal of the first stage shift register unit is connected to the first clock signal CLK, the second clock signal input end of the first stage shift register unit is connected to the second clock signal CLKB, and the first stage The first clock signal input end of the second stage shift register unit adjacent to the shift register unit is connected to the second clock signal CLKB, and the second clock signal input end of the second stage shift register unit is connected to the first clock signal CLK.
- the embodiment of the invention further provides a display device comprising the above shift register.
- the display device may include a liquid crystal display device such as a liquid crystal panel, a liquid crystal television, a mobile phone, or a liquid crystal display.
- the display device may further include an organic light emitting display or other type of display device such as an electronic reader or the like.
- the shift register can be used as a scanning circuit or a » pole driving circuit of the display device to provide a progressive scanning function to send a scanning signal to the display area.
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- Computer Hardware Design (AREA)
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Abstract
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14/416,029 US9620241B2 (en) | 2013-07-27 | 2014-05-21 | Shift register unit, method for driving the same, shift register and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013103204792A CN103413514A (zh) | 2013-07-27 | 2013-07-27 | 移位寄存器单元、移位寄存器和显示装置 |
| CN201310320479.2 | 2013-07-27 | ||
| CN201310750479.6A CN103700357B (zh) | 2013-07-27 | 2013-12-31 | 移位寄存器单元及其驱动方法、移位寄存器和显示装置 |
| CN201310750479.6 | 2013-12-31 |
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| US (1) | US9620241B2 (zh) |
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| KR20250118313A (ko) * | 2024-01-29 | 2025-08-06 | 삼성디스플레이 주식회사 | 게이트 구동부 및 이를 포함하는 표시 장치 |
| KR20250131902A (ko) * | 2024-02-27 | 2025-09-04 | 삼성디스플레이 주식회사 | 구동회로 |
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Also Published As
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| CN103413514A (zh) | 2013-11-27 |
| US9620241B2 (en) | 2017-04-11 |
| US20160064098A1 (en) | 2016-03-03 |
| CN103700357A (zh) | 2014-04-02 |
| CN103700357B (zh) | 2016-01-13 |
| CN203773916U (zh) | 2014-08-13 |
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