WO2013159543A1 - 一种移位寄存器和显示器 - Google Patents

一种移位寄存器和显示器 Download PDF

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Publication number
WO2013159543A1
WO2013159543A1 PCT/CN2012/086797 CN2012086797W WO2013159543A1 WO 2013159543 A1 WO2013159543 A1 WO 2013159543A1 CN 2012086797 W CN2012086797 W CN 2012086797W WO 2013159543 A1 WO2013159543 A1 WO 2013159543A1
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WO
WIPO (PCT)
Prior art keywords
thin film
film transistor
pull
gate
shift register
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2012/086797
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English (en)
French (fr)
Inventor
商广良
韩承佑
赵家阳
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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Filing date
Publication date
Application filed by BOE Technology Group Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to US13/995,672 priority Critical patent/US9064592B2/en
Priority to JP2015507340A priority patent/JP6219930B2/ja
Priority to EP12852439.4A priority patent/EP2846332B1/en
Priority to KR1020137015276A priority patent/KR101564818B1/ko
Publication of WO2013159543A1 publication Critical patent/WO2013159543A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11CSTATIC STORES
    • G11C19/00Digital stores in which the information is moved stepwise, e.g. shift registers
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11CSTATIC STORES
    • G11C19/00Digital stores in which the information is moved stepwise, e.g. shift registers
    • G11C19/18Digital stores in which the information is moved stepwise, e.g. shift registers using capacitors as main elements of the stages
    • G11C19/182Digital 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
    • G11C19/184Digital 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11CSTATIC STORES
    • G11C19/00Digital stores in which the information is moved stepwise, e.g. shift registers
    • G11C19/28Digital stores in which the information is moved stepwise, e.g. shift registers using semiconductor elements
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/02Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264Details of driving circuits
    • G09G2310/0283Arrangement of drivers for different directions of scanning
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/02Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264Details of driving circuits
    • G09G2310/0286Details of a shift registers arranged for use in a driving circuit
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/06Details of flat display driving waveforms
    • G09G2310/061Details of flat display driving waveforms for resetting or blanking
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0223Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]
    • G09G3/3266Details of drivers for scan electrodes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3685Details of drivers for data electrodes
    • G09G3/3688Details of drivers for data electrodes suitable for active matrices only

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a shift register and a display. Background technique
  • the shift register is used to provide a drive signal for the gate line, and includes a multi-stage shift register unit.
  • FIG. 1A is a schematic structural diagram of a shift register unit in the prior art
  • FIG. 1B is a timing diagram of the shift register unit in FIG. 1A.
  • the shift register unit includes 12 thin film transistors and a storage capacitor. The shift register unit allows the shift register to implement only the forward scan drive, and the bidirectional scan drive cannot be realized. Summary of the invention
  • the embodiment of the present invention provides a shift register for solving the problem that the existing shift register can only implement forward scan driving and cannot realize bidirectional scan driving, and also provides a display including a shift register.
  • An embodiment of the present invention provides a shift register including a multi-stage shift register unit, and each stage shift register unit in the multi-stage shift register unit includes:
  • a first thin film transistor for charging or discharging a pull-up node under control of a driving input signal and a scan direction selection signal, wherein the first thin film transistor serves as a shift register of the stage during forward scan driving a start switch of the unit, charging the pull-up node, and when the reverse scan is driven, the first thin film transistor acts as a reset switch of the shift register unit of the stage, and discharges the pull-up node;
  • a second thin film transistor for discharging or charging the pull-up node under control of the first reset signal and the scan direction selection signal, wherein the second thin film transistor is used as a forward scan drive a reset switch of the shift register unit of the stage, discharging the pull-up node, and in the reverse scan driving, the second thin film transistor is used as a start switch of the shift register unit of the stage, and the pull-up is Point to charge;
  • a reset unit configured to reset the pull-up node and the output end
  • a pull-up unit for pulling the potential of the output high during the output phase.
  • the gate of the first thin film transistor is connected to the input end, and the source is connected to the pull-up Point and drain are connected to the first scanning direction selection signal input end;
  • the gate of the second thin film transistor is connected to the first reset signal input terminal, the source is connected to the pull-up node, and the drain is connected to the first scan direction selection signal input terminal.
  • the pull-up unit may include:
  • a third thin film transistor having a gate connected to the first end of the storage capacitor, a source connected to the output end, and a drain connected to the first clock signal input end;
  • the storage capacitor has a first end connected to the pull-up node and a second end connected to the output end.
  • the resetting unit may include:
  • a fourth thin film transistor having a gate connected to the second clock signal input terminal, a source connected to the low level, and a drain connected to the output terminal;
  • a fifth thin film transistor having a gate connected to the pull-down control node, a source connection pull-down node, and a drain connected to the second clock signal input terminal;
  • a sixth thin film transistor having a gate connected to the pull-up node, a source connected to the low level, and a drain connected to the pull-down node;
  • a seventh thin film transistor having a gate and a drain connected to the second clock signal input end and a source connected to the pull-down control node;
  • An eighth thin film transistor having a gate connected to the pull-up node, a source connected to the low level, and a drain connected to the pull-down control node;
  • a ninth thin film transistor having a gate connected to the pull-down node, a source connected to the low level, and a drain connected to the pull-up node;
  • a tenth thin film transistor having a gate connected to the pull-down node, a source connected to the low level, and a drain connected to the output terminal.
  • the shift register unit of each stage may further include:
  • the first reset control unit is configured to ensure resetting of the output by the reset unit.
  • the first reset control unit may include:
  • the eleventh thin film transistor has a gate connected to the first reset signal input end, a source connected low level, and a drain connected output end;
  • the twelfth thin film transistor has a gate connected to the input terminal, a source connected to the low level, and a drain connected to the output terminal.
  • the resetting unit may include:
  • the fifth thin film transistor has a gate connected to the pull-down control node, a source connection pull-down node, and a drain connection Connected to the second clock signal input terminal;
  • a sixth thin film transistor having a gate connected to the pull-up node, a source connected to a low level, and a drain connected to the pull-down node;
  • a seventh thin film transistor having a gate and a drain connected to the second clock signal input end and a source connected to the pull-down control node;
  • An eighth thin film transistor having a gate connected to the pull-up node, a source connected to the low level, and a drain connected to the pull-down control node;
  • a ninth thin film transistor having a gate connected to the pull-down node, a source connected to the low level, and a drain connected to the pull-up node;
  • a tenth thin film transistor having a gate connected to the pull-down node, a source connected to the low level, and a drain connected to the output terminal;
  • a thirteenth thin film transistor having a gate connected to the second reset control unit, a source connected to a low level, and a drain connected to the output terminal;
  • the second reset control unit is configured to ensure that the reset unit resets the output end.
  • the second reset control unit may include: a fourteenth thin film transistor having a gate connected to the first reset signal input end and a source connected to the gate of the thirteenth thin film transistor The drain is connected to the second scan direction selection signal input end;
  • a fifteenth thin film transistor having a gate connected to the input end, a source connected to the gate of the thirteenth thin film transistor, and a drain connected to the second scan direction selection signal input end;
  • the sixteenth thin film transistor has a gate connected to the first scan direction selection signal input terminal, a source connected to the low level, and a drain connected to the gate of the thirteenth thin film transistor.
  • the second reset control unit may include: a seventeenth thin film transistor having a gate connected to the first reset signal input terminal and a source connected to the thirteenth thin film transistor a gate electrode and a drain connected to the second scan direction selection signal input terminal; an eighteenth thin film transistor having a gate connection input terminal, a source connected to the gate of the thirteenth thin film transistor, and a drain connection a second scanning direction selection signal input end;
  • a nineteenth thin film transistor having a gate connected to the second reset signal input terminal, a source connected to the low level, and a drain connected to the gate of the thirteenth thin film transistor;
  • the twentieth thin film transistor has a gate connected to the third reset signal input terminal, a source connected to the low level, and a drain connected to the gate of the thirteenth thin film transistor.
  • Embodiments of the present invention provide a display including any of the shift registers described.
  • the above shift register and display provided by the embodiments of the present invention can implement bidirectional scan driving. DRAWINGS
  • 1A is a schematic structural diagram of a conventional shift register unit
  • 1B is a timing chart of driving of the shift register unit of FIG. 1A;
  • 2A is a schematic structural diagram of a shift register unit according to an embodiment of the present invention.
  • FIG. 2B is a schematic structural diagram of another shift register unit according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a shift register unit according to Embodiment 1 of the present invention
  • FIG. 4 is a shift register unit having the shift register unit of FIG. Schematic diagram of the shift register
  • FIG. 5 is a timing chart of the forward scan drive of the shift register of FIG. 4;
  • FIG. 6 is a timing chart of a reverse scan driving of the shift register of FIG. 4;
  • FIG. 7 is a schematic structural diagram of a shift register unit in a second embodiment of the present invention
  • FIG. 8 is a schematic structural diagram of a shift register having five drive signals in the shift register unit of FIG. 7;
  • Figure 10 is a timing chart of the reverse scan driving of the shift register of Figure 8.
  • Figure 11 is a block diagram showing the structure of a shift register having six drive signals of the shift register unit of Figure 7;
  • Figure 13 is a timing chart of the reverse scan driving of the shift register of Figure 11;
  • FIG. 14 is a schematic structural diagram of a shift register unit in a third embodiment of the present invention.
  • FIG. 15 is a schematic diagram showing a structure of a shift register having four drive signals in the shift register unit of FIG.
  • Figure 16 is a block diagram showing the structure of a shift register unit in a fourth embodiment of the present invention
  • Figure 17 is a block diagram showing the structure of a shift register having four drive signals in the shift register unit of Figure 16; detailed description
  • Embodiments of the present invention provide a shift register including a multi-stage shift register unit, as shown in the figure As shown in 2A, each stage of the shift register unit in the multi-stage shift register unit includes:
  • the first thin film transistor T1 is configured to charge or discharge the pull-up node PU under the control of the driving input signal and the scanning direction selection signal, wherein, in the forward scanning driving, the first thin film transistor
  • T1 is used as a start switch of the shift register unit of the stage to charge the pull-up node PU.
  • the first thin film transistor T1 acts as a reset switch of the shift register unit of the stage, and the pull-up node PU Perform discharge
  • a second thin film transistor T2 for discharging or charging the pull-up node PU under the control of the first reset signal and the scan direction selection signal, wherein, in the forward scan driving, the second thin film transistor
  • the second thin film transistor T2 is used as a reset switch of the shift register unit of the stage to discharge the pull-up node PU.
  • the second thin film transistor T2 acts as a start switch of the shift register unit of the stage, and pulls up the node PU.
  • a reset unit for resetting the pull-up node PU and the output terminal OUT;
  • Pull-up unit for pulling the potential of the output OUT high during the output phase.
  • the gate of the first thin film transistor T1 can be connected to the input terminal INPUT, the source is connected to the pull-up node PU, and the drain is connected to the first scan direction selection signal input terminal CLK';
  • the gate of the thin film transistor T2 is connected to the first reset signal input terminal RESET, the source connection pull-up node PU, and the drain connection first scan direction selection signal input terminal CLK'.
  • the above pull-up unit may include:
  • the third thin film transistor T3 has a first terminal connected to the storage capacitor C1, a source connected to the output terminal OUT, and a drain connected to the first clock signal input terminal CLK;
  • the storage capacitor C1 has a first end connected to the pull-up node PU and a second end connected to the output end ⁇ .
  • the foregoing resetting unit may specifically include:
  • the fourth thin film transistor ⁇ 4 has a gate connected to the second clock signal input terminal CLKB, a source connected to the low level VSS, and a drain connected to the output terminal OUT;
  • the fifth thin film transistor T5 has a gate connected to the pull-down control node PD-CN, a source connection pull-down node PD, and a drain connection second clock signal input terminal CLKB;
  • the sixth thin film transistor T6 has a gate connected to the pull-up node PU, a source connected low level VSS, and a drain connected pull-down node PD; a seventh thin film transistor T7 having a gate and a drain connected to the second clock signal input terminal CLKB and a source connection pull-down control node PD-CN;
  • the eighth thin film transistor T8 has a gate connected to the pull-up junction PU, a source connected low level VSS, and a drain connection pull-down control node PD-CN;
  • the ninth thin film transistor T9 has a gate connected to the pull-down node PD, a source connected to the low level VSS, and a drain connected to the pull-up node PU;
  • the tenth thin film transistor T10 has a gate connected to the pull-down node PD, a source connected to the low level VSS, and a drain connected to the output terminal OUT.
  • the structure of the shift register having the shift register unit shown in Fig. 3 is as shown in Fig. 4, and the forward scan drive timing is as shown in Fig. 5, and the reverse scan drive timing is as shown in Fig. 6.
  • the main feature of the shift register is that the first clock signal input terminal CLK and the second clock signal input terminal CLKB of the adjacent shift register unit are alternately connected to the driving signals CLK and CLKB, respectively;
  • the first scanning direction selection signal input terminal CLK of the bit register unit is respectively connected to the driving signals clk3, clk4, wherein two adjacent ones are connected to the same driving signal, and the other two are connected to another driving signal (such as clk3, clk3, clk4) , clk4, or clk4, clk4, clk3, clk3, or clk3, clk4, clk4, clk3, or clk4, clk4, clk3, or clk4, clk3, or clk4, clk3, clk3, clk4, drive timing needs to match the connection mode);
  • input register INPUT of the shift register unit is connected to the previous one
  • the driving signal of the first scanning direction selection signal input terminal CLK' connected to the shift register unit should satisfy three requirements: one is that the input (INPUT) phase is high level, and the other is that the reset phase is low level, and at the same time, When the frame start signal is high, the signal connected to the first scan direction selection signal input terminal CLK' of the first stage shift register unit and the last stage shift register unit is one high level and one low level. level.
  • the first thin film transistor T1 is turned on.
  • the clk3 connected to the first scan direction selection signal input terminal CLK' is also at a high level, and the PU node is charged.
  • the first clock signal CLK becomes a high level
  • the output GL1 also becomes a high level
  • GL1 also serves as a gate input signal of the second stage shift register unit, then the second stage
  • the first thin film transistor T1 of the shift register unit is also turned on.
  • the clk3 connected to the first scan direction selection signal input terminal CLK' of the second stage shift register unit is still at a high level, and the second stage shift The pull-up node PU of the register unit is charged.
  • the Reset signal of the first stage shift register unit becomes a high level
  • the second thin film transistor T2 is turned on, and this
  • the first scan direction of the first stage shift register unit selects the signal input terminal CLK, and the connected clk3 becomes a low level
  • the pull-up node PU is pulled low, thereby realizing the pull-up node PU reset;
  • the clock signal input terminal CLK becomes a low level
  • the second clock signal input terminal CLKB becomes a high level
  • the fourth thin film transistor T4 is turned on
  • the seventh thin film transistor T7 is turned on
  • the eighth thin film transistor T8 and the sixth thin film are turned on.
  • the pull-down control node PD_CN becomes a high level
  • the fifth thin film transistor ⁇ 5 is turned on
  • the pull-down node PD also becomes a high level
  • the tenth thin film transistor ⁇ 10 and the ninth thin film transistor ⁇ 9 are also On, the output OUT is pulled low to VSS to reset.
  • the other shift register units are similar here, and the scan control signal output is implemented row by row.
  • the shift register drive signal CLK is swapped with the CLKB timing, and the direction select signal clk3 is interchanged with clk4.
  • the timing is as shown in FIG. 6.
  • the second thin film transistor T2 is turned on.
  • the clk4 connected to the first scan direction selection signal input terminal CLK' is also at a high level, and then the pull-up is performed. Point PU charging.
  • the second clock signal CLKB becomes a high level
  • the output GLn also becomes a high level
  • GLn also serves as an input signal of the n-1th stage shift register unit
  • the n-th The second thin film transistor T2 of the 1-stage shift register unit is also turned on.
  • the clk4 connected to the first scan direction selection signal input terminal CLK' of the n-1th stage shift register unit is still at the high level, then The pull-up node PU of the n-1 stage shift register unit is charged.
  • the RESET phase which is also the output stage of the n-1th stage shift register unit
  • GL(nl) goes high
  • the reset signal of the nth stage shift register unit that is, the first input signal INPUT end becomes high.
  • the first thin film transistor T1 is turned on, and at this time, the clk4 connected to the first scan direction selection signal input terminal CLK' becomes a low level, and the pull-up node PU is pulled low, and the pull-up is realized.
  • the second clock signal input terminal CLKB becomes low level
  • the first clock signal input terminal CLK changes
  • the fourth thin film transistor T4 is turned on
  • the seventh thin film transistor ⁇ 7 is turned on
  • the eighth thin film transistor ⁇ 8 and the sixth thin film transistor ⁇ 6 are turned off
  • the pull-down control node PD-CN becomes high level
  • the thin film transistor ⁇ 5 is turned on and the pull-down node PD is also turned to the high level
  • the tenth thin film transistor ⁇ 10 and the ninth thin film transistor ⁇ 9 are also turned on, and the output is pulled down to VSS to be reset.
  • the other shift register units are similar to this, and the scan control signal output is implemented row by row.
  • STV-F and STV- ⁇ are the same signal, they are collectively referred to as STV.
  • STV In the forward scan drive, when STV is high, clk3 is high, then the first thin film transistor T1 of the first stage shift register unit is turned on, and the pull-up node PU is charged; at this time, clk4 is low.
  • the first thin film transistor T1 of the last stage shift register unit is also turned on, the pull-up node PU is not charged, is still low, and does not activate the unit.
  • the reverse scan is driven, the last stage shift register unit is activated, and the first stage shift register unit is not activated. Thereby a two-way scan drive can be implemented.
  • the shift register unit connection period of FIG. 4 is 4, and n is exactly an integer multiple of 4, if not, the drive timing, the connection mode, or the empty shift register unit should be adjusted to satisfy Three requirements for the scan direction selection signal.
  • the shift register unit shown in Figure 3 can realize 8-clock drive by two repetitive structures and shifted drive clock signals, which can effectively reduce the power consumption of the gate driver.
  • the scanning direction selection signal can be two, three, four or more, and the driving timing and connection mode can be adjusted accordingly.
  • the above-mentioned shift register unit of each stage can also add a first reset control unit based on the structure shown in FIG. 3 to ensure the reset of the output terminal by the reset unit shown in FIG.
  • the first reset control unit may include:
  • the eleventh thin film transistor T11 has a gate connected to the first reset signal input terminal RESET, a source connected low level VSS, and a drain connected output terminal OUT;
  • the twelfth thin film transistor T12 has a gate connected to the input terminal INPUT, a source connected to the low level VSS, and a drain connected to the output terminal OUT.
  • the structure of the shift register of the five drive signals (5-clock) having the shift register unit shown in FIG. 7 is as shown in FIG. 8; the forward scan drive timing is as shown in FIG.
  • the drive timing is shown in Figure 10.
  • the structure of the shift register of the six drive signals (6-clock) having the shift register unit shown in FIG. 7 is as shown in FIG. 11; the forward scan drive timing is as shown in FIG. 12, and the reverse scan drive timing is as shown in FIG. Figure 13 shows.
  • the fourth thin film transistor T4 is subjected to a large voltage, the duty ratio is about 50%, which causes a large threshold voltage shift, which is not conducive to the stability of the gate driving; and the eleventh thin film transistor T11 is added.
  • the twelfth thin film transistor T12 can ensure the reliability of the output reset, thereby enhancing the reliability of the gate drive.
  • the output terminal OUT is reset by the eleventh thin film transistor T11; when the reverse scanning is performed, the output terminal OUT is reset by the twelfth thin film transistor T12.
  • the reset unit may further include:
  • the fifth thin film transistor T5 has a gate connected to the pull-down control node PD-CN, a source connection pull-down node PD, and a drain connection second clock signal input terminal CLKB;
  • the sixth thin film transistor T6 has a gate connected to the pull-up node PU, a source connected to the low level VSS, and a drain connected to the pull-down node PD;
  • a seventh thin film transistor T7 having a gate and a drain connected to the second clock signal input terminal CLKB and a source connection pull-down control node PD-CN;
  • the eighth thin film transistor T8 has a gate connected to the pull-up junction PU, a source connected low level VSS, and a drain connection pull-down control node PD-CN;
  • the ninth thin film transistor T9 has a gate connected to the pull-down node PD, a source connected to the low level VSS, and a drain connected to the pull-up node PU;
  • the tenth thin film transistor T10 has a gate connected to the pull-down node PD, a source connected to the low level VSS, and a drain connected to the output terminal OUT;
  • the thirteenth thin film transistor T13 has a gate connected to the second reset control unit, a source connected to the low level VSS, and a drain connected output terminal OUT;
  • the second reset control unit is configured to ensure that the reset unit resets the output terminal OUT.
  • the foregoing second reset control unit includes:
  • the fourteenth thin film transistor T14 has a gate connected to the first reset signal input terminal RESET, a source connected to the gate of the thirteenth thin film transistor T13, and a drain connected to the second scan direction selection signal input terminal CLK'B;
  • the fifteenth thin film transistor T15 has a gate connected to the input terminal INPUT, a source connected to the gate of the thirteenth thin film transistor T13, and a drain connected to the second scan direction selection signal input terminal CLK'B;
  • the sixteenth thin film transistor T16 has a gate connected to the first scanning direction selection signal input terminal CLK, a source connected to the low level VSS, and a drain connected to the gate of the thirteenth thin film transistor T13.
  • the structure of the shift register of the four drive signals (4-clock) having the shift register unit shown in FIG. 14 is as shown in FIG. 15; the forward drive timing is the same as that shown in FIG. 5, and the reverse drive is performed. The timing is the same as that shown in FIG. 6.
  • the first scanning direction selection signal input terminal CLK', the input terminal INPUT is at a high level
  • the second scanning direction selection signal input terminal CLK'B, and the first reset signal input terminal Reset are at a low level
  • the fourteenth thin film transistor T14 is turned off, the fifteenth thin film transistor T15 and the sixteenth thin film transistor T16 are turned on, the gate of the thirteenth thin film transistor T13 is pulled low, and the thirteenth thin film transistor T13 is turned off;
  • the input terminal INPUT and the first reset signal input terminal Reset are at a low level, (the first scan direction selection signal input terminal CLK', and the second scan direction selection signal input terminal CLK'B are high level or If the low level is OK, the fourteenth thin film transistor T14 and the fifteenth thin film transistor T15 are turned off (the sixteenth thin film transistor T16 can be turned on or off), and the gate of the thirteenth thin film transistor T13 is kept low. Flat, that is, the thirteenth thin film transistor T13 is kept off;
  • the second scan direction selection signal input terminal CLK'B, the first reset signal input terminal Reset is at a high level, the first scan direction selection signal input terminal CLK', and the input terminal INPUT are at a low level, then
  • the fourteenth thin film transistor T14 is turned on, the fifteenth thin film transistor T15 and the sixteenth thin film transistor T16 are turned off, and the gate of the thirteenth thin film transistor T13 is turned to a high level, that is, the thirteenth thin film transistor T13 is turned on, and the output is Terminal OUT reset;
  • the input terminal INPUT and the first reset signal input terminal Reset are kept at a low level, that is, the fourteenth thin film transistor T14 is turned off, and the fifteenth thin film transistor T15 is turned off; the first scan direction selection signal input terminal CLK
  • the sixteenth thin film transistor T16 is turned on, and the gate of the thirteenth thin film transistor T13 is pulled low, the thirteenth thin film transistor T13 is kept turned off, thereby reducing the bias of the thirteenth thin film transistor T13.
  • the applied voltage is beneficial to extend the working life of the thirteenth thin film transistor T13, that is, the reset reliability of the shift register.
  • Reverse scan is similar to forward scan, mainly because the drive signal needs to be changed.
  • the foregoing second reset control unit may further include:
  • the seventeenth thin film transistor T17 has a gate connected to the first reset signal input terminal RESET, a source connected to the gate of the thirteenth thin film transistor T13, and a drain connected to the second scan direction selection signal input end.
  • the eighteenth thin film transistor T18 has a gate connected to the input terminal INPUT, a source connected to the gate of the thirteenth thin film transistor T13, and a drain connected to the second scan direction selection signal input terminal CLK'B;
  • the nineteenth thin film transistor T19 has a gate connected to the second reset signal input terminal RESET2, a source connected to the low level VSS, and a drain connected to the gate of the thirteenth thin film transistor T13;
  • the twentieth thin film transistor T20 has a gate connected to the third reset signal input terminal RESET3, a source connected to the low level VSS, and a drain connected to the gate of the thirteenth thin film transistor T13.
  • the structure of the shift register of the four drive signals (4-clock) having the shift register unit shown in FIG. 16 is as shown in FIG. 17; the forward drive timing is the same as that shown in FIG. The timing is the same as that shown in FIG. 6.
  • the shift register unit 16 has an advantage over the shift register unit shown in FIG. 3 in that the stability is better; and the shift register unit shown in FIG. 7 has the advantage of reducing the thin film transistor directly used for resetting the output terminal OUT, The area required for the shift register unit can be effectively reduced (since the thin film transistor directly used for resetting the output terminal OUT is large in size).
  • the input terminal INPUT, the first reset signal input terminal Reset, the third reset signal input terminal Reset3 are at a low level, and the second reset signal input terminal Reset2 is at a high level, then the seventeenth thin film transistor T17, The eighteenth thin film transistor ⁇ 18, the twentieth thin film transistor ⁇ 20 is turned off, the nineteenth thin film transistor T19 is turned on, the thirteenth thin film transistor T13 gate is pulled low, and the thirteenth thin film transistor T13 is turned off;
  • the input terminal INPUT is high, the second scan direction selection signal input terminal CLK, B, the first reset signal input terminal Reset, the second reset signal input terminal Reset2, and the third reset signal input terminal Reset3 are low.
  • the seventeenth thin film transistor T17, the nineteenth thin film transistor T19, and the twentieth thin film transistor T20 are turned off, and although the eighteenth thin film transistor T18 is turned on, the gate of the thirteenth thin film transistor T13 remains low. , the thirteenth thin film transistor T13 is turned off;
  • the input terminal INPUT, the first reset signal input terminal Reset, the second reset signal input terminal Reset2, and the third reset signal input terminal Reset3 are at a low level, (the second scan direction selection signal input terminal CLK'B is regardless of Whether it is a high level or a low level, the seventeenth thin film transistor T17, the eighteenth thin film transistor ⁇ 18, the nineteenth thin film transistor ⁇ 19, the twentieth thin film transistor ⁇ 20 are turned off, and the thirteenth thin film transistor T13 is gated. Extremely low, the thirteenth thin film transistor T13 remains cut off;
  • the second scan direction selection signal input terminal CLK'B, the first reset signal input terminal Reset is at a high level, the input terminal INPUT, the second reset signal input terminal Reset2, and the third reset signal input terminal Reset3 are low.
  • the seventeenth thin film transistor T17 is turned on, the eighteenth thin film transistor T18, the nineteenth thin film transistor ⁇ 19, and the twentieth thin film transistor ⁇ 20 are turned off, and the gate of the thirteenth thin film transistor T13 is turned to a high level. That is, the thirteenth thin film transistor T13 is turned on, and the output terminal OUT is reset;
  • the input terminal INPUT, the first reset signal input terminal Reset, the second reset signal input terminal Reset2 are at a low level, and the third reset signal input terminal Reset3 is at a high level, then
  • the seventeenth thin film transistor T17, the eighteenth thin film transistor ⁇ 18, the nineteenth thin film transistor T19 are turned off, the twentieth thin film transistor ⁇ 20 is turned on, the gate of the thirteenth thin film transistor T13 is pulled low, and the thirteenth thin film transistor T13 is turned off. , completing resetting of the thirteenth thin film transistor T13;
  • the input terminal INPUT, the first reset signal input terminal Reset, the second reset signal input terminal Reset2, and the third reset signal input terminal Reset3 are directly maintained at a low level, that is, the seventeenth thin film transistor T17, tenth
  • the eight thin film transistor ⁇ 18, the nineteenth thin film transistor ⁇ 19, and the twentieth thin film transistor ⁇ 20 are kept off; then the gate voltage of the thirteenth thin film transistor T13 is kept at a low level, thereby reducing the bias effect of the thirteenth thin film transistor T13.
  • the voltage is beneficial to extend the operational life of the thirteenth thin film transistor T13, that is, the reset reliability of the shift register.
  • the shift register of the shift register unit of Fig. 3, Fig. 7 (or the same or similar interface) can be used in the structure shown in Fig. 4 or in addition to the structure shown in Fig. Its derived structure.
  • Figure 8 shows a direction selection signal clk5 with respect to Figure 4, as shown in Figure 8.
  • the driving timing of this structure is shown in FIGS. 9 and 10.
  • the specific driving process is similar to that of Figure 3.
  • the shift register drive signal CLK is swapped with the CLKB timing, and the direction select signal clk3 is interchanged with clk5.
  • the timing is as shown in FIGS. 9 and 10.
  • the advantage is that the number of cells connected to each selection signal clkx is reduced (from the original n/2 to n/3), which can reduce the power consumption of the storage capacitor; the other is to reduce the shift register unit does not work.
  • the advantage is that the number of cells connected by each scanning direction selection signal clkx is reduced (from the original n/2 to n/4), which can reduce the power consumption of the storage capacitor; the other is to reduce the shift register unit.
  • the duty ratio of the direction selection signal is not working (from the original 50% to 25%), the possibility of accidental opening can be effectively reduced, thereby improving reliability.
  • an embodiment of the present invention further provides a display, including any one of the foregoing shift registers provided by the embodiments of the present invention.

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Abstract

一种移位寄存器,用以解决现有移位寄存器只能实现正向扫描驱动、不能实现双向扫描驱动的问题。该移位寄存器包括:第一薄膜晶体管(T1)、第二薄膜晶体管(T2)、复位单元和上拉单元。以及一种包括所述移位寄存器的显示器。上述移位寄存器和显示器可以实现双向扫描驱动。

Description

一种移位寄存器和显示器 技术领域
本发明涉及显示技术领域, 特别涉及一种移位寄存器和显示器。 背景技术
移位寄存器用于为栅线提供驱动信号, 包含多级移位寄存器单元。
图 1A为现有技术中一种移位寄存器单元的结构示意图, 图 1B为图 1A 中移位寄存器单元的时序图。 如图 1A所示, 该移位寄存器单元包括 12个薄 膜晶体管和 1个存储电容,该移位寄存器单元使得移位寄存器只能实现正向扫 描驱动, 而不能实现双向扫描驱动。 发明内容
本发明实施例提供了一种移位寄存器,用以解决现有移位寄存器只能实现 正向扫描驱动、 不能实现双向扫描驱动的问题, 并且还提供了一种包括移位寄 存器的显示器。
本发明实施例提供了一种移位寄存器, 包括多级移位寄存器单元, 所述多 级移位寄存器单元中的每级移位寄存器单元包括:
第一薄膜晶体管,用于在驱动输入信号和扫描方向选择信号的控制下对上 拉结点进行充电或放电, 其中, 在正向扫描驱动时, 所述第一薄膜晶体管作为 该级移位寄存器单元的启动开关,对所述上拉结点进行充电,在反向扫描驱动 时, 所述第一薄膜晶体管作为该级移位寄存器单元的复位开关,对所述上拉结 点进行放电;
第二薄膜晶体管,用于在第一复位信号和所述扫描方向选择信号的控制下 对所述上拉结点进行放电或充电, 其中, 在正向扫描驱动时, 所述第二薄膜晶 体管作为该级移位寄存器单元的复位开关,对所述上拉结点进行放电,在反向 扫描驱动时, 所述第二薄膜晶体管作为该级移位寄存器单元的启动开关,对所 述上拉结点进行充电;
复位单元, 用于对所述上拉结点和输出端进行复位;
上拉单元, 用于在输出阶段将所述输出端的电位拉高。
其中, 优选地, 所述第一薄膜晶体管的栅极连接输入端、 源极连接上拉结 点、 漏极连接第一扫描方向选择信号输入端;
所述第二薄膜晶体管的栅极连接第一复位信号输入端、源极连接所述上拉 结点、 漏极连接所述第一扫描方向选择信号输入端。
其中, 优选地, 所述上拉单元可包括:
第三薄膜晶体管, 其栅极连接存储电容的第一端、 源极连接输出端、 漏极 连接第一时钟信号输入端;
存储电容, 其第一端连接所述上拉结点、 第二端连接所述输出端。
其中, 优选地, 根据一实施例, 所述复位单元可包括:
第四薄膜晶体管, 其栅极连接第二时钟信号输入端、 源极连接低电平、 漏 极连接所述输出端;
第五薄膜晶体管, 其栅极连接下拉控制结点、 源极连接下拉结点、 漏极连 接所述第二时钟信号输入端;
第六薄膜晶体管, 其栅极连接所述上拉结点、 源极连接所述低电平、 漏极 连接所述下拉结点;
第七薄膜晶体管, 其栅极和漏极连接所述第二时钟信号输入端、 源极连接 所述下拉控制结点;
第八薄膜晶体管, 其栅极连接所述上拉结点、 源极连接所述低电平、 漏极 连接所述下拉控制结点;
第九薄膜晶体管, 其栅极连接所述下拉结点、 源极连接所述低电平、 漏极 连接所述上拉结点;
第十薄膜晶体管, 其栅极连接所述下拉结点、 源极连接所述低电平、 漏极 连接所述输出端。
其中, 优选地, 所述每级移位寄存器单元还可包括:
第一复位控制单元, 用于保证所述复位单元对输出端的复位。
其中, 优选地, 所述第一复位控制单元可包括:
第十一薄膜晶体管, 其栅极连接第一复位信号输入端、 源极连接低电平、 漏极连接输出端;
第十二薄膜晶体管, 其栅极连接输入端、 源极连接低电平、 漏极连接输出 端。
其中, 优选地, 根据另一实施例, 所述复位单元可包括:
第五薄膜晶体管, 其栅极连接下拉控制结点、 源极连接下拉结点、 漏极连 接第二时钟信号输入端;
第六薄膜晶体管, 其栅极连接所述上拉结点、 源极连接低电平、 漏极连接 所述下拉结点;
第七薄膜晶体管, 其栅极和漏极连接所述第二时钟信号输入端、 源极连接 所述下拉控制结点;
第八薄膜晶体管, 其栅极连接所述上拉结点、 源极连接所述低电平、 漏极 连接所述下拉控制结点;
第九薄膜晶体管, 其栅极连接所述下拉结点、 源极连接所述低电平、 漏极 连接所述上拉结点;
第十薄膜晶体管, 其栅极连接所述下拉结点、 源极连接所述低电平、 漏极 连接所述输出端;
第十三薄膜晶体管, 其栅极连接第二复位控制单元、 源极连接低电平、 漏 极连接所述输出端;
其中, 所述第二复位控制单元, 用于保证所述复位单元对输出端的复位。 其中, 优选地, 根据一实施例, 所述第二复位控制单元可包括: 第十四薄膜晶体管, 其栅极连接第一复位信号输入端、 源极连接所述第十 三薄膜晶体管的栅极、 漏极连接第二扫描方向选择信号输入端;
第十五薄膜晶体管, 其栅极连接输入端、 源极连接所述第十三薄膜晶体管 的栅极、 漏极连接第二扫描方向选择信号输入端;
第十六薄膜晶体管, 其栅极连接第一扫描方向选择信号输入端、 源极连接 低电平、 漏极连接所述第十三薄膜晶体管的栅极。
其中, 优选地, 根据另一实施例, 所述第二复位控制单元可包括: 第十七薄膜晶体管, 其栅极连接所述第一复位信号输入端、 源极连接所述 第十三薄膜晶体管的栅极、 漏极连接所述第二扫描方向选择信号输入端; 第十八薄膜晶体管, 其栅极连接输入端、 源极连接所述第十三薄膜晶体管 的栅极、 漏极连接所述第二扫描方向选择信号输入端;
第十九薄膜晶体管, 其栅极连接第二复位信号输入端、 源极连接低电平、 漏极连接所述第十三薄膜晶体管的栅极;
第二十薄膜晶体管, 其栅极连接第三复位信号输入端、 源极连接低电平、 漏极连接所述第十三薄膜晶体管的栅极。
本发明实施例提供一种显示器, 包括所述的任一种移位寄存器。 本发明实施例提供的上述移位寄存器和显示器可以实现双向扫描驱动。 附图说明
图 1A为现有移位寄存器单元的结构示意图;
图 1B为图 1A中移位寄存器单元的驱动时序图;
图 2A为本发明实施例中一种移位寄存器单元的结构示意图;
图 2B为本发明实施例中另一种移位寄存器单元的结构示意图; 图 3为本发明具体实施例一中的移位寄存器单元的结构示意图; 图 4为具有图 3中移位寄存器单元的移位寄存器的结构示意图; 图 5为图 4中移位寄存器的正向扫描驱动时序图;
图 6为图 4中移位寄存器的反向扫描驱动时序图;
图 7为本发明具体实施例二中的移位寄存器单元的结构示意图; 图 8为具有图 7中移位寄存器单元的、 5个驱动信号的移位寄存器的结构 示意图;
图 9为图 8中移位寄存器的正向扫描驱动时序图;
图 10为图 8中移位寄存器的反向扫描驱动时序图;
图 11为具有图 7中移位寄存器单元的、 6个驱动信号的移位寄存器的结 构示意图;
图 12为图 11中移位寄存器的正向扫描驱动时序图;
图 13为图 11中移位寄存器的反向扫描驱动时序图;
图 14为本发明具体实施例三中的移位寄存器单元的结构示意图; 图 15为具有图 14中移位寄存器单元的、 4个驱动信号的移位寄存器的结 构示意图;
图 16为本发明具体实施例四中的移位寄存器单元的结构示意图; 图 17为具有图 16中移位寄存器单元的、 4个驱动信号的移位寄存器的结 构示意图。 具体实施方式
为使本发明实施例要解决的技术问题、技术方案和优点更加清楚, 下面将 结合附图及具体实施例进行详细描述。
本发明实施例提供了一种移位寄存器, 包括多级移位寄存器单元, 如图 2A所示, 多级移位寄存器单元中的每级移位寄存器单元包括:
第一薄膜晶体管 T1 , 用于在驱动输入信号和扫描方向选择信号的控制下 对上拉结点 PU进行充电或放电, 其中, 在正向扫描驱动时, 第一薄膜晶体管
T1作为该级移位寄存器单元的启动开关, 对上拉结点 PU进行充电, 在反向 扫描驱动时, 第一薄膜晶体管 T1作为该级移位寄存器单元的复位开关, 对上 拉结点 PU进行放电;
第二薄膜晶体管 T2, 用于在第一复位信号和扫描方向选择信号的控制下 对上拉结点 PU进行放电或充电, 其中, 在正向扫描驱动时, 第二薄膜晶体管
T2作为该级移位寄存器单元的复位开关, 对上拉结点 PU进行放电, 在反向 扫描驱动时, 第二薄膜晶体管 T2作为该级移位寄存器单元的启动开关, 对上 拉结点 PU进行充电;
复位单元, 用于对上拉结点 PU和输出端 OUT进行复位;
上拉单元, 用于在输出阶段将输出端 OUT的电位拉高。
其中, 优选地, 如图 2A所示, 第一薄膜晶体管 T1的栅极可连接输入端 INPUT,源极连接上拉结点 PU、漏极连接第一扫描方向选择信号输入端 CLK'; 第二薄膜晶体管 T2的栅极连接第一复位信号输入端 RESET、源极连接上 拉结点 PU、 漏极连接第一扫描方向选择信号输入端 CLK'。
如图 2B所示, 上述上拉单元可包括:
第三薄膜晶体管 T3 ,其栅极连接存储电容 C1的第一端、 源极连接输出端 OUT, 漏极连接第一时钟信号输入端 CLK;
存储电容 C1 , 其第一端连接上拉结点 PU、 第二端连接输出端 ουτ。 本发明实施例提供的上述移位寄存器可以实现双向扫描驱动。
下面以多个具体实施例说明上述移位寄存器的具体实施方式:
实施例一
优选地, 如图 3所示, 上述复位单元具体可包括:
第四薄膜晶体管 Τ4, 其栅极连接第二时钟信号输入端 CLKB、 源极连接 低电平 VSS、 漏极连接输出端 OUT;
第五薄膜晶体管 T5, 其栅极连接下拉控制结点 PD— CN、 源极连接下拉结 点 PD、 漏极连接第二时钟信号输入端 CLKB;
第六薄膜晶体管 T6, 其栅极连接上拉结点 PU、 源极连接低电平 VSS、 漏 极连接下拉结点 PD; 第七薄膜晶体管 T7, 其栅极和漏极连接第二时钟信号输入端 CLKB、 源 极连接下拉控制结点 PD— CN;
第八薄膜晶体管 T8, 其栅极连接上拉结点 PU、 源极连接低电平 VSS、 漏 极连接下拉控制结点 PD— CN;
第九薄膜晶体管 T9, 其栅极连接下拉结点 PD、 源极连接低电平 VSS、 漏 极连接上拉结点 PU;
第十薄膜晶体管 T10, 其栅极连接下拉结点 PD、 源极连接低电平 VSS、 漏极连接输出端 OUT。
此时, 具有图 3所示移位寄存器单元的移位寄存器的结构如图 4所示, 其 正向扫描驱动时序如图 5所示, 反向扫描驱动时序如图 6所示。
如图 4所示,该移位寄存器的主要特征是相邻移位寄存器单元的第一时钟 信号输入端 CLK和第二时钟信号输入端 CLKB分别交替连接驱动信号 CLK 和 CLKB; 相邻四个移位寄存器单元的第一扫描方向选择信号输入端 CLK,分 别连接驱动信号 clk3、 clk4, 其中相邻的两个连接同一个驱动信号, 并且另外 两个连接另一个驱动信号 (如 clk3、 clk3、 clk4、 clk4, 或 clk4、 clk4、 clk3、 clk3 , 或 clk3、 clk4、 clk4、 clk3 , 或 clk4、 clk3、 clk3、 clk4, 驱动时序需与连 接方式匹配); 移位寄存器单元的输入端 INPUT连接上一级移位寄存器单元的 输出端 OUT、第一复位信号输入端 RESET连接下一级移位寄存器单元的输出 端 OUT, 第一个移位寄存器单元的输入端 INPUT及最后一个移位寄存器单元 的第一复位信号输入端 RESET连接帧起始信号 STV ( STV_F和 STV— B可以 是相同信号, 也可以不是同一个信号); 所有移位寄存器单元的输出端 OUT 都连接至相应的栅线; 所有的 VSS都连接至低电平信号 vss。
连接移位寄存器单元的第一扫描方向选择信号输入端 CLK'的驱动信号应 满足三个要求: 一是输入(INPUT ) 阶段为高电平, 二是复位阶段为低电平, 同时,还应满足在帧起始信号为高电平时, 第一级移位寄存器单元和最后一级 移位寄存器单元的第一扫描方向选择信号输入端 CLK'连接的信号一个为高电 平、 一个为低电平。
如图 5所示, 在正向扫描驱动时, 对第一级移位寄存器单元:
在 INPUT阶段, 即 STV— F信号变为高电平时, 其第一薄膜晶体管 T1导 通, 此时, 第一扫描方向选择信号输入端 CLK'连接的 clk3也为高电平, 则 PU节点充电。 然后, 在输出 OUT阶段, 第一时钟信号 CLK变为高电平, 则输出 GL1 也变为高电平; 同时, GL1也作为第二级移位寄存器单元的栅极输入信号, 则 第二级移位寄存器单元的第一薄膜晶体管 T1也导通, 此时, 第二级移位寄存 器单元的第一扫描方向选择信号输入端 CLK'连接的 clk3仍为高电平, 则第二 级移位寄存器单元的上拉结点 PU充电。
在 RESET阶段, 也是第二级移位寄存器单元的输出阶段, GL2变为高电 平, 则第一级移位寄存器单元的 Reset信号变为高电平, 第二薄膜晶体管 T2 导通, 而此时, 第一级移位寄存器单元的第一扫描方向选择信号输入端 CLK, 连接的 clk3变为低电平, 则上拉结点 PU被拉低, 实现了上拉结点 PU复位; 第一时钟信号输入端 CLK变为低电平, 第二时钟信号输入端 CLKB变为高电 平, 则第四薄膜晶体管 T4导通, 第七薄膜晶体管 T7导通, 第八薄膜晶体管 T8、 第六薄膜晶体管 Τ6截止, 则下拉控制结点 PD— CN变为高电平, 第五薄 膜晶体管 Τ5导通, 下拉结点 PD也变为高电平, 则第十薄膜晶体管 Τ10、 第 九薄膜晶体管 Τ9也导通, 输出 OUT端被拉低至 VSS, 实现复位。 其他移位 寄存器单元于此类似, 逐行实现扫描控制信号输出。
在反向扫描驱动时, 移位寄存器驱动信号 CLK与 CLKB时序互换, 方向 选择信号 clk3与 clk4互换, 时序如图 6所示。
在反向扫描驱动时, 对第 n级移位寄存器单元:
在 INPUT阶段, 即 STV— B信号变为高电平时, 其第二薄膜晶体管 T2导 通, 此时, 第一扫描方向选择信号输入端 CLK'连接的 clk4也为高电平, 则上 拉结点 PU充电。
然后, 在输出 OUT阶段, 第二时钟信号 CLKB变为高电平, 则输出 GLn 也变为高电平; 同时, GLn也作为第 n-1级移位寄存器单元的输入信号, 则第 n-1级移位寄存器单元的第二薄膜晶体管 T2也导通, 此时, 第 n-1级移位寄存 器单元的第一扫描方向选择信号输入端 CLK'连接的 clk4仍为高电平,则第 n-1 级移位寄存器单元的上拉结点 PU充电。
在 RESET阶段, 也是第 n-1级移位寄存器单元的输出阶段, GL(n-l)变为 高电平, 则第 n级移位寄存器单元的复位信号, 即第一输入信号 INPUT端变 为高电平, 其第一薄膜晶体管 T1导通, 而此时, 第一扫描方向选择信号输入 端 CLK'连接的 clk4变为低电平,则上拉结点 PU被拉低, 实现了上拉结点 PU 复位; 第二时钟信号输入端 CLKB变为低电平, 第一时钟信号输入端 CLK变 为高电平, 则第四薄膜晶体管 T4导通, 第七薄膜晶体管 Τ7导通, 第八薄膜 晶体管 Τ8、 第六薄膜晶体管 Τ6截止, 则下拉控制结点 PD— CN变为高电平, 第五薄膜晶体管 Τ5导通,下拉结点 PD也变为高电平,则第十薄膜晶体管 Τ10、 第九薄膜晶体管 Τ9也导通, 输出被拉低至 VSS, 实现复位。 其他移位寄存器 单元与此类似, 逐行实现扫描控制信号输出。
如果 STV— F与 STV— Β是同一信号, 统称为 STV。 正向扫描驱动时, STV 为高电平时, clk3为高电平, 则第一级移位寄存器单元的第一薄膜晶体管 T1 导通, 上拉结点 PU充电; 而此时, clk4为低电平, 虽然最后一级移位寄存器 单元的第一薄膜晶体管 T1也导通, 但上拉结点 PU并没有充电, 仍为低电平, 并不会启动该单元。同样的,反向扫描驱动时,最后一级移位寄存器单元启动, 而第一级移位寄存器单元则不启动。 从而可以实现双向扫描驱动。
需要说明的是, 图 4的移位寄存器单元连接周期是 4, 而 n正好为 4的整 数倍的情况, 如果不是, 则应调整驱动时序、 连接方式、 或增加空的移位寄存 器单元来满足扫描方向选择信号的三个要求。
另外,图 3所示移位寄存器单元可以两个重复结构及移位的驱动时钟信号 实现 8 - clock驱动, 可以有效降低栅极驱动器的功耗。 扫描方向选择信号可 以是两个、 三个、 四个或更多, 驱动时序及连接方式进行相应的调整即可。
实施例二
上述每级移位寄存器单元还可以在图 3所示结构的基础上,增加一个第一 复位控制单元, 用于保证图 3所示复位单元对输出端的复位。
具体地, 如图 7所示, 该第一复位控制单元可以包括:
第十一薄膜晶体管 T11 , 其栅极连接第一复位信号输入端 RESET、 源极 连接低电平 VSS、 漏极连接输出端 OUT;
第十二薄膜晶体管 T12,其栅极连接输入端 INPUT、源极连接低电平 VSS、 漏极连接输出端 OUT。
此时, 具有图 7所示移位寄存器单元的、 5个驱动信号(5-clock ) 的移位 寄存器的结构如图 8所示; 其正向扫描驱动时序如图 9所示,反向扫描驱动时 序如图 10所示。
具有图 7所示移位寄存器单元的、 6个驱动信号(6-clock )的移位寄存器 的结构如图 11所示; 其正向扫描驱动时序如图 12所示,反向扫描驱动时序如 图 13所示。 由于第四薄膜晶体管 T4受到的作用电压都较大, 占空比约为 50%, 会引 起较大的阔值电压偏移, 不利于栅极驱动的稳定性; 增加了第十一薄膜晶体管 T11和第十二薄膜晶体管 T12可以保证输出端复位的可靠性,进而增强栅极驱 动的可靠性。
具体地, 正向扫描时, 通过第十一薄膜晶体管 T11给输出端 OUT复位; 反向扫描时, 通过第十二薄膜晶体管 T12给输出端 OUT复位。
实施例三
优选地, 复位单元还可以包括:
第五薄膜晶体管 T5, 其栅极连接下拉控制结点 PD— CN、 源极连接下拉结 点 PD、 漏极连接第二时钟信号输入端 CLKB;
第六薄膜晶体管 T6, 其栅极连接上拉结点 PU、 源极连接低电平 VSS、 漏 极连接下拉结点 PD;
第七薄膜晶体管 T7, 其栅极和漏极连接第二时钟信号输入端 CLKB、 源 极连接下拉控制结点 PD— CN;
第八薄膜晶体管 T8, 其栅极连接上拉结点 PU、 源极连接低电平 VSS、 漏 极连接下拉控制结点 PD— CN;
第九薄膜晶体管 T9, 其栅极连接下拉结点 PD、 源极连接低电平 VSS、 漏 极连接上拉结点 PU;
第十薄膜晶体管 T10, 其栅极连接下拉结点 PD、 源极连接低电平 VSS、 漏极连接输出端 OUT;
第十三薄膜晶体管 T13 , 其栅极连接第二复位控制单元、 源极连接低电平 VSS、 漏极连接输出端 OUT;
其中, 第二复位控制单元, 用于保证复位单元对输出端 OUT的复位。 具体地, 如图 14所示, 上述第二复位控制单元包括:
第十四薄膜晶体管 T14, 其栅极连接第一复位信号输入端 RESET、 源极 连接第十三薄膜晶体管 T13的栅极、 漏极连接第二扫描方向选择信号输入端 CLK'B;
第十五薄膜晶体管 T15 ,其栅极连接输入端 INPUT、 源极连接第十三薄膜 晶体管 T13的栅极、 漏极连接第二扫描方向选择信号输入端 CLK'B;
第十六薄膜晶体管 T16,其栅极连接第一扫描方向选择信号输入端 CLK,、 源极连接低电平 VSS、 漏极连接第十三薄膜晶体管 T13的栅极。 此时, 具有图 14所示移位寄存器单元的、 4个驱动信号 (4-clock ) 的移 位寄存器的结构如图 15所示; 其正向驱动时序与图 5所示相同, 反向驱动时 序与图 6所示相同。
下面主要说明上述第二复位控制单元保证输出端 OUT复位的工作过程: 在正向扫描时:
在输入 INPUT阶段,第一扫描方向选择信号输入端 CLK'、输入端 INPUT 为高电平, 第二扫描方向选择信号输入端 CLK'B、 第一复位信号输入端 Reset 为低电平, 则第十四薄膜晶体管 T14截止, 第十五薄膜晶体管 T15、 第十六薄 膜晶体管 T16导通, 第十三薄膜晶体管 T13的栅极被拉低, 第十三薄膜晶体 管 T13截止;
在输出 OUT阶段, 输入端 INPUT、第一复位信号输入端 Reset为低电平, (第一扫描方向选择信号输入端 CLK'、 第二扫描方向选择信号输入端 CLK'B 无论为高电平还是低电平都可以), 则第十四薄膜晶体管 T14、 第十五薄膜晶 体管 T15截止 (第十六薄膜晶体管 T16无论导通或截止都可以 ), 第十三薄膜 晶体管 T13的栅极保持低电平, 即第十三薄膜晶体管 T13保持截止;
在复位 RESET阶段, 第二扫描方向选择信号输入端 CLK'B、 第一复位信 号输入端 Reset为高电平,第一扫描方向选择信号输入端 CLK'、 输入端 INPUT 为低电平, 则第十四薄膜晶体管 T14导通, 第十五薄膜晶体管 T15、 第十六薄 膜晶体管 T16截止, 第十三薄膜晶体管 T13的栅极变为高电平, 即第十三薄 膜晶体管 T13导通, 对输出端 OUT复位;
在非工作阶段, 输入端 INPUT、 第一复位信号输入端 Reset—直保持为低 电平, 即第十四薄膜晶体管 T14截止, 第十五薄膜晶体管 T15截止; 第一扫 描方向选择信号输入端 CLK,变高时, 第十六薄膜晶体管 T16导通, 第十三薄 膜晶体管 T13的栅极即被拉低, 则第十三薄膜晶体管 T13保持截止, 从而减 小第十三薄膜晶体管 T13的偏置作用电压,有利于延长第十三薄膜晶体管 T13 的工作寿命, 即移位寄存器的复位可靠性。
反向扫描与正向扫描类似, 主要是驱动信号需要改变。
实施例四
如图 16所示, 上述第二复位控制单元还可以包括:
第十七薄膜晶体管 T17, 其栅极连接第一复位信号输入端 RESET、 源极 连接第十三薄膜晶体管 T13的栅极、 漏极连接第二扫描方向选择信号输入端 CLK'B;
第十八薄膜晶体管 T18,其栅极连接输入端 INPUT、 源极连接第十三薄膜 晶体管 T13的栅极、 漏极连接第二扫描方向选择信号输入端 CLK'B;
第十九薄膜晶体管 T19, 其栅极连接第二复位信号输入端 RESET2、 源极 连接低电平 VSS、 漏极连接第十三薄膜晶体管 T13的栅极;
第二十薄膜晶体管 T20, 其栅极连接第三复位信号输入端 RESET3、 源极 连接低电平 VSS、 漏极连接第十三薄膜晶体管 T13的栅极。
此时, 具有图 16所示移位寄存器单元的、 4个驱动信号 (4-clock ) 的移 位寄存器的结构如图 17所示; 其正向驱动时序与图 5所示相同, 反向驱动时 序与图 6所示相同。
图 16相对于图 3所示的移位寄存器单元, 其优点是稳定性较好; 相对于 图 7所示的移位寄存器单元, 其优点是减少了直接用于输出端 OUT复位的薄 膜晶体管,可以有效减小移位寄存器单元所需面积(由于直接用于输出端 OUT 复位的薄膜晶体管尺寸较大)。
下面主要说明上述第二复位控制单元保证输出端 OUT复位的工作过程: 在正向扫描时:
在输入前阶段, 输入端 INPUT、 第一复位信号输入端 Reset、 第三复位信 号输入端 Reset3为低电平, 第二复位信号输入端 Reset2为高电平, 则第十七 薄膜晶体管 T17、 第十八薄膜晶体管 Τ18、 第二十薄膜晶体管 Τ20截止, 第十 九薄膜晶体管 T19导通, 第十三薄膜晶体管 T13栅极被拉低, 第十三薄膜晶 体管 T13截止;
在输入 INPUT阶段, 输入端 INPUT为高电平, 第二扫描方向选择信号输 入端 CLK,B、 第一复位信号输入端 Reset、 第二复位信号输入端 Reset2、 第三 复位信号输入端 Reset3为低电平,则第十七薄膜晶体管 T17、第十九薄膜晶体 管 Τ19、 第二十薄膜晶体管 Τ20截止, 虽然第十八薄膜晶体管 T18导通, 但第 十三薄膜晶体管 T13的栅极仍保持为低, 第十三薄膜晶体管 T13截止;
在输出 OUT阶段, 输入端 INPUT、 第一复位信号输入端 Reset、 第二复 位信号输入端 Reset2、 第三复位信号输入端 Reset3为低电平, (第二扫描方向 选择信号输入端 CLK'B无论为高电平还是低电平都可以 ),则第十七薄膜晶体 管 T17、 第十八薄膜晶体管 Τ18、 第十九薄膜晶体管 Τ19、 第二十薄膜晶体管 Τ20截止, 第十三薄膜晶体管 T13的栅极保持低电平, 即第十三薄膜晶体管 T13保持截止;
在复位 RESET阶段, 第二扫描方向选择信号输入端 CLK'B、 第一复位 信号输入端 Reset为高电平, 输入端 INPUT、 第二复位信号输入端 Reset2、 第 三复位信号输入端 Reset3为低电平, 则第十七薄膜晶体管 T17导通, 第十八 薄膜晶体管 T18、 第十九薄膜晶体管 Τ19、 第二十薄膜晶体管 Τ20截止, 第十 三薄膜晶体管 T13的栅极变为高电平, 即第十三薄膜晶体管 T13导通, 对输 出端 OUT复位;
在第十三薄膜晶体管 T13的复位阶段, 输入端 INPUT、 第一复位信号输 入端 Reset、第二复位信号输入端 Reset2为低电平,第三复位信号输入端 Reset3 变为高电平, 则第十七薄膜晶体管 T17、 第十八薄膜晶体管 Τ18、 第十九薄膜 晶体管 T19截止, 第二十薄膜晶体管 Τ20导通, 第十三薄膜晶体管 T13的栅 极被拉低, 第十三薄膜晶体管 T13截止, 完成对第十三薄膜晶体管 T13的复 位;
在非工作阶段, 输入端 INPUT、 第一复位信号输入端 Reset、 第二复位信 号输入端 Reset2、 第三复位信号输入端 Reset3—直保持为低电平, 即第十七 薄膜晶体管 T17、 第十八薄膜晶体管 Τ18、 第十九薄膜晶体管 Τ19、 第二十薄 膜晶体管 Τ20保持截止; 则第十三薄膜晶体管 T13的栅极电压保持低电平, 从而减小第十三薄膜晶体管 T13的偏置作用电压, 有利于延长第十三薄膜晶 体管 T13的工作寿命, 即移位寄存器的复位可靠性。
在反向扫描与正向扫描类似, 主要是驱动信号需要改变。
最后对以上几个实施例进行综合说明:
釆用图 3、 图 7 (或接口相同的或类似的)移位寄存器单元的移位寄存器 除了可以釆用图 4所示的结构, 还可以釆用如图 8、 图 11所示的结构或其衍 生的结构。
图 8相对于图 4, 增加了一个方向选择信号 clk5, 连接方式如图 8所示。 该结构的驱动时序如图 9、 图 10所示。 具体驱动过程与图 3的类似。 反向扫 描驱动时, 移位寄存器驱动信号 CLK与 CLKB时序互换, 方向选择信号 clk3 与 clk5互换, 时序如图 9、 图 10所示。 其优点一是每个选择信号 clkx连接的 单元数减少 (由原来的 n/2, 变为 n/3 ), 可以降低存储电容带来的功耗; 另一 个是可以减少移位寄存器单元不工作时扫描方向选择信号的占空比(由原来的 50%, 变为 33% ), 可以有效减小意外打开的可能性, 从而提高可靠性。 图 11相对于图 4, 增加了两个扫描方向选择信号 clk5、 clk6 , 连接方式如 图 11所示。 该结构的驱动时序如图 12、 图 13所示。 具体驱动过程与图 3的 类似。 反向扫描驱动时, 移位寄存器驱动信号 CLK与 CLKB时序互换, 方向 选择信号 clk3与 clk6互换, clk4与 clk5互换, 时序如图 12、 图 13所示。 其 优点一是每个扫描方向选择信号 clkx连接的单元数减少 (由原来的 n/2, 变为 n/4 ), 可以降低存储电容带来的功耗; 另一个是可以减少移位寄存器单元不工 作时方向选择信号的占空比(由原来的 50%, 变为 25% ), 可以有效减小意外 打开的可能性, 从而提高可靠性。
釆用图 14或接口相同的类似移位寄存器单元的移位寄存器, 除了可以釆 用图 15所示的结构, 还可以釆用类似图 8、 图 11或其衍生结构的结构。
釆用图 16或接口相同的类似移位寄存器单元的移位寄存器, 除了可以釆 用图 17所示的结构, 还可以釆用类似图 8、 图 11或其衍生结构的结构, 其优 点是稳定性好。
另外, 本发明实施例还提供了一种显示器, 包括本发明实施例提供的前述 任意一种移位寄存器。
以上所述是本发明的优选实施方式,应当指出,对于本技术领域的普通技 术人员来说,在不脱离本发明所述原理的前提下,还可以作出若干改进和润饰, 这些改进和润饰也应视为本发明的保护范围。

Claims

权 利 要 求 书
1、 一种移位寄存器, 包括多级移位寄存器单元, 其特征在于, 所述多级 移位寄存器单元中的每级移位寄存器单元包括:
第一薄膜晶体管, 用于在驱动输入信号和扫描方向选择信号的控制下对 上拉结点进行充电或放电, 其中, 在正向扫描驱动时, 所述第一薄膜晶体管 作为该级移位寄存器单元的启动开关, 对所述上拉结点进行充电, 在反向扫 描驱动时, 所述第一薄膜晶体管作为该级移位寄存器单元的复位开关, 对所 述上拉结点进行放电;
第二薄膜晶体管, 用于在第一复位信号和所述扫描方向选择信号的控制 下对所述上拉结点进行放电或充电, 其中, 在正向扫描驱动时, 所述第二薄 膜晶体管作为该级移位寄存器单元的复位开关, 对所述上拉结点进行放电, 在反向扫描驱动时, 所述第二薄膜晶体管作为该级移位寄存器单元的启动开 关, 对所述上拉结点进行充电;
复位单元, 用于对所述上拉结点和输出端进行复位;
上拉单元, 用于在输出阶段将所述输出端的电位拉高。
2、 如权利要求 1所述的移位寄存器, 其特征在于,
所述第一薄膜晶体管的栅极连接输入端、 源极连接上拉结点、 漏极连接 第一扫描方向选择信号输入端;
所述第二薄膜晶体管的栅极连接第一复位信号输入端、 源极连接所述上 拉结点、 漏极连接所述第一扫描方向选择信号输入端。
3、 如权利要求 1所述的移位寄存器, 其特征在于, 所述上拉单元包括: 第三薄膜晶体管, 其栅极连接存储电容的第一端、 源极连接输出端、 漏 极连接第一时钟信号输入端;
存储电容, 其第一端连接所述上拉结点、 第二端连接所述输出端。
4、 如权利要求 1所述的移位寄存器, 其特征在于, 所述复位单元包括: 第四薄膜晶体管, 其栅极连接第二时钟信号输入端、 源极连接低电平、 漏极连接所述输出端;
第五薄膜晶体管, 其栅极连接下拉控制结点、 源极连接下拉结点、 漏极 连接所述第二时钟信号输入端;
第六薄膜晶体管, 其栅极连接所述上拉结点、 源极连接所述低电平、 漏 极连接所述下拉结点;
第七薄膜晶体管, 其栅极和漏极连接所述第二时钟信号输入端、 源极连 接所述下拉控制结点;
第八薄膜晶体管, 其栅极连接所述上拉结点、 源极连接所述低电平、 漏 极连接所述下拉控制结点;
第九薄膜晶体管, 其栅极连接所述下拉结点、 源极连接所述低电平、 漏 极连接所述上拉结点;
第十薄膜晶体管, 其栅极连接所述下拉结点、 源极连接所述低电平、 漏 极连接所述输出端。
5、 如权利要求 4所述的移位寄存器, 其特征在于, 所述每级移位寄存器 单元还包括:
第一复位控制单元, 用于保证所述复位单元对输出端的复位。
6、 如权利要求 5所述的移位寄存器, 其特征在于, 所述第一复位控制单 元包括:
第十一薄膜晶体管, 其栅极连接第一复位信号输入端、 源极连接低电平、 漏极连接输出端;
第十二薄膜晶体管, 其栅极连接输入端、 源极连接低电平、 漏极连接输 出端。
7、 如权利要求 1所述的移位寄存器, 其特征在于, 所述复位单元包括: 第五薄膜晶体管, 其栅极连接下拉控制结点、 源极连接下拉结点、 漏极 连接第二时钟信号输入端;
第六薄膜晶体管, 其栅极连接所述上拉结点、 源极连接低电平、 漏极连 接所述下拉结点;
第七薄膜晶体管, 其栅极和漏极连接所述第二时钟信号输入端、 源极连 接所述下拉控制结点;
第八薄膜晶体管, 其栅极连接所述上拉结点、 源极连接所述低电平、 漏 极连接所述下拉控制结点;
第九薄膜晶体管, 其栅极连接所述下拉结点、 源极连接所述低电平、 漏 极连接所述上拉结点;
第十薄膜晶体管, 其栅极连接所述下拉结点、 源极连接所述低电平、 漏 极连接所述输出端; 第十三薄膜晶体管, 其栅极连接第二复位控制单元、 源极连接低电平、 漏极连接所述输出端;
其中, 所述第二复位控制单元, 用于保证所述复位单元对输出端的复位。
8、 如权利要求 7所述的移位寄存器, 其特征在于, 所述第二复位控制单 元包括:
第十四薄膜晶体管, 其栅极连接第一复位信号输入端、 源极连接所述第 十三薄膜晶体管的栅极、 漏极连接第二扫描方向选择信号输入端;
第十五薄膜晶体管, 其栅极连接输入端、 源极连接所述第十三薄膜晶体 管的栅极、 漏极连接第二扫描方向选择信号输入端;
第十六薄膜晶体管, 其栅极连接第一扫描方向选择信号输入端、 源极连 接低电平、 漏极连接所述第十三薄膜晶体管的栅极。
9、 如权利要求 7所述的移位寄存器, 其特征在于, 所述第二复位控制单 元包括:
第十七薄膜晶体管, 其栅极连接所述第一复位信号输入端、 源极连接所 述第十三薄膜晶体管的栅极、 漏极连接所述第二扫描方向选择信号输入端; 第十八薄膜晶体管, 其栅极连接输入端、 源极连接所述第十三薄膜晶体 管的栅极、 漏极连接所述第二扫描方向选择信号输入端;
第十九薄膜晶体管, 其栅极连接第二复位信号输入端、 源极连接低电平、 漏极连接所述第十三薄膜晶体管的栅极;
第二十薄膜晶体管, 其栅极连接第三复位信号输入端、 源极连接低电平、 漏极连接所述第十三薄膜晶体管的栅极。
10、 一种显示器, 其特征在于, 包括如权利要求 1-9中任一所述的移位 寄存器。
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US9064592B2 (en) 2015-06-23
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