WO2016106847A1 - 正反向扫描的栅极驱动电路 - Google Patents

正反向扫描的栅极驱动电路 Download PDF

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Publication number
WO2016106847A1
WO2016106847A1 PCT/CN2015/070642 CN2015070642W WO2016106847A1 WO 2016106847 A1 WO2016106847 A1 WO 2016106847A1 CN 2015070642 W CN2015070642 W CN 2015070642W WO 2016106847 A1 WO2016106847 A1 WO 2016106847A1
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Prior art keywords
circuit
gate
pull
goa unit
transistor
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
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PCT/CN2015/070642
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English (en)
French (fr)
Inventor
肖军城
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
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Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to GB1711612.0A priority Critical patent/GB2550713B/en
Priority to EA201791517A priority patent/EA034004B1/ru
Priority to JP2017535680A priority patent/JP6599463B2/ja
Priority to KR1020177021168A priority patent/KR102080730B1/ko
Priority to US14/418,753 priority patent/US9484111B2/en
Publication of WO2016106847A1 publication Critical patent/WO2016106847A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3674—Details of drivers for scan electrodes
    • G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C19/00—Digital stores in which the information is moved stepwise, e.g. shift registers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C19/00—Digital stores in which the information is moved stepwise, e.g. shift registers
    • G11C19/28—Digital stores in which the information is moved stepwise, e.g. shift registers using semiconductor elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2230/00—Details of flat display driving waveforms
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0267—Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0283—Arrangement of drivers for different directions of scanning
    • 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

  • the present invention relates to the field of liquid crystal display technology, and in particular to a GOA for liquid crystal display (Gate Driver on Array, array substrate row scan drive circuit and liquid crystal display device.
  • GOA Gate Driver on Array
  • array substrate row scan drive circuit and liquid crystal display device.
  • the driving circuit of the horizontal scanning line can be fabricated on the substrate around the display area by using the original process of the liquid crystal display panel, so that it can replace the external IC to complete the level. Scan line driver.
  • GOA technology can reduce the number of peripheral driver chips and their sealing process, making flat panel display (Flat Panel Display, FPD) reduces the cost, and at the same time enables a narrow frame with light weight, thin thickness and symmetrical appearance.
  • FPD Flat Panel Display
  • the display module is more compact, which is beneficial to simplify the design of the source drive circuit, improve the resolution of the display panel, and increase the flexible display. The possibility of a panel.
  • the GOA unit mainly includes a pull-up circuit, a pull-up control circuit, a down-conversion circuit, a pull-down circuit and a pull-down sustain circuit, and a bootstrap capacitor responsible for the potential rise.
  • the pull-up circuit is mainly responsible for outputting a clock signal as a gate signal and using a control circuit to control an opening time point of the pull-up circuit, and the pull-up control circuit is generally connected to the front stage GOA unit. Send a signal or a gate signal.
  • the pull-down circuit is responsible for pulling the gate signal low to the first time, that is, turning off the gate signal.
  • the pull-down sustain circuit is responsible for maintaining the gate output signal and the gate signal of the pull-up circuit (commonly referred to as Q point) at a negative potential, and can use a bootstrap capacitor to raise the voltage at the Q point again, which is advantageous for pulling up.
  • the gate output of the circuit is responsible for maintaining the gate output signal and the gate signal of the pull-up circuit (commonly referred to as Q point) at a negative potential, and can use a bootstrap capacitor to raise the voltage at the Q point again, which is advantageous for pulling up.
  • the existing GOA circuit has a three-stage voltage-divided pull-down sustain circuit
  • the stability problem of the GOA circuit is still a large problem currently faced by the display device, which is mainly caused by the device stability of the circuit.
  • users also have a variety of needs for scanning methods of display devices.
  • the gate driving circuit includes a plurality of cascaded GOA units, and each stage of the GOA unit includes a pull-up control circuit, a pull-up circuit, a pull-down circuit, a pull-down sustain circuit, a reset circuit, and a bootstrap capacitor.
  • the present invention charges the key node Q with its DC potential by introducing a forward scan control signal and a reverse scan control signal, which are equivalent to opposite signals in a frame. In this way, the delay of the level signal is affected to affect the charging of the key node Q.
  • a gate drive circuit for bidirectional scanning of a liquid crystal display device
  • the gate driving circuit includes a plurality of cascaded GOA units, and the GOA unit generates one or more scanning signals and outputs the signals to a liquid crystal display device, wherein each GOA unit includes:
  • the method includes a forward scan control signal input end for inputting a scan control signal sequentially outputted from the top to the bottom, and a reverse scan control signal input end for inputting a scan control signal sequentially outputted from the bottom to the upper stage,
  • the plurality of gate signal input ends are configured to receive a gate signal of the upper stage GOA unit and a gate signal of the next stage GOA unit and an output end for outputting a pull-up control signal;
  • the input terminal connected to the key node Q(N) is configured to receive the pull-up control signal
  • the clock signal input terminal is configured to receive a plurality of clock signals and a gate signal output end of the GOA unit of the stage, where
  • the pull-up control signal is formed according to the scan control signal of the pull-up control circuit and the gate signal transmitted by the GOA unit of the previous stage or the GOA unit of the next stage, In the forward scan, when the gate signal transmitted from the upper level GOA unit is high, the pull-up circuit is activated to charge the key node Q(N), and in the reverse scan, the next-level GOA unit When the transmitted gate signal is high, the pull-up circuit is activated to charge the key node Q(N);
  • a bootstrap circuit including a bootstrap capacitor to raise the voltage of the above-mentioned key node Q(N) again;
  • a pull-down circuit includes a gate signal input terminal for receiving a gate signal transmitted from a next-stage GOA unit, a low voltage input terminal for inputting a low-current input voltage, and a connection to the key node Q(N) Output, Discharging the voltage of the key node Q(N) when receiving the gate signal transmitted by the next-stage GOA unit;
  • a pull-down sustaining circuit includes a plurality of first clock signal inputs for inputting a first clock signal, and a plurality of second clock signal inputs for inputting a second clock signal, a plurality of connecting ends are connected to the key node Q(N) and the signal output end of the GOA unit, and under the control of the first clock signal and the second clock signal, the key node Q(N) and the GOA unit are The signal output is kept low until the next critical node (Q) is charged.
  • a signal output end of the GOA unit coupled to a corresponding gate line;
  • a reset circuit performs an operation of resetting the potential of the key node Q(N).
  • the present invention provides a gate driving circuit for a liquid crystal display device,
  • the gate driving circuit includes a plurality of cascaded GOA units, and the GOA unit generates one or more scanning signals and sequentially outputs to a liquid crystal display device, wherein each GOA unit includes:
  • the first transistor and the second transistor are connected in series, wherein the drain of the first transistor and the source of the second transistor are respectively connected and input with a scan control signal and a synchronous output from the top to the bottom.
  • Scan control signals output sequentially from the bottom to the upper level,
  • the gates of the first transistor and the second transistor are respectively connected to and receive the gate signals of the upper level GOA unit and the gate signals of the next stage GOA unit;
  • the drain receives a plurality of clock signals, and the gate signal point thereof is a key node Q(N) connected to the source of the first transistor and the drain of the second transistor, according to the scanning control of the pull-up control circuit
  • the signal and the gate signal transmitted by the GOA unit of the previous stage or the GOA unit of the next stage to charge the voltage of the key node Q(N) and control the opening time of the pull-up circuit, and then output the gate signal of the GOA unit of the stage.
  • the gate signal of the GOA unit corresponds to the Nth horizontal scanning line of the liquid crystal display device;
  • a pull-down circuit having a drain and a source connected to the key node Q(N) and an input DC low voltage, respectively
  • the gate is connected to and receives a gate signal transmitted from the next stage GOA unit to discharge the voltage of the key node Q(N);
  • a pull-down sustaining circuit comprising: fifth and sixth transistors for inputting third and fourth transistors and second clock signals of the first clock signal, wherein the first clock signal and the second clock signal are inverted signals, Maintaining the critical node Q(N) and the gate output signal at a low level under the control of the first clock signal and the second clock signal until the next critical node (Q) is charged;
  • a reset circuit performs an operation of resetting the potential of the key node Q(N).
  • a liquid crystal display device comprising the gate drive circuit for bidirectional scanning of the liquid crystal display device.
  • the pull-down maintaining circuit in addition to making the scanning mode of the display device versatile, adds a transistor to enhance the protection of the pull-down maintaining circuit at a suitable potential during the active and inactive phases.
  • the key node Q(N) and the gate output signal G(N) can be effectively maintained at a low potential to maintain the circuit performance optimization and stability.
  • FIG. 1 is a circuit diagram of a gate driving unit circuit according to Embodiment 1 of the present application.
  • FIG. 2 is a circuit diagram of a gate driving unit circuit according to Embodiment 2 of the present application.
  • FIG. 3 is a circuit diagram of a gate driving unit circuit according to Embodiment 3 of the present application.
  • FIG. 4 is a circuit diagram of a gate driving unit circuit according to Embodiment 4 of the present application.
  • FIG. 5 is a circuit diagram of another gate driving unit circuit according to Embodiment 4 of the present application.
  • FIG. 6 is a timing diagram of a gate driving unit circuit in a forward scanning mode according to Embodiment 4 of the present application;
  • FIG. 7 is a timing diagram of a gate driving unit circuit in a reverse scan mode according to Embodiment 4 of the present application.
  • FIG. 1 is a gate driving circuit for liquid crystal display according to the present invention.
  • the gate driving circuit includes a plurality of cascaded GOA units including a pull-up control circuit 100, a pull-up circuit 200, a pull-down circuit 400, a pull-down sustain circuit 500, a reset circuit 600, and a bootstrap capacitor (Cb).
  • pull-up control circuit 100 and reset circuit 600 are coupled to gate signal point Q(N) of pull-up circuit 200, respectively.
  • the pull-down circuit 400, the pull-down maintaining circuit 500, and the bootstrap capacitor (Cb) are respectively connected to the gate signal point Q(N) of the pull-up circuit 200 and the N-th horizontal scanning line G(N).
  • One transistor of pull-up control circuit 100 The gate of T1 is connected to the output signal G(N-1) of the N-1th stage GOA unit, and the source of T1 is connected to the gate signal point Q(N) of the pull-up circuit 200, and the forward scanning control signal UD is The drain of T1 is introduced.
  • Another transistor of the pull-up control circuit 100 The gate of T0 is connected to the output signal G(N+1) of the N+1th GOA unit, the drain of T0 is connected to the gate signal point Q(N) of the pull-up circuit 200, and the reverse scan control signal DU is connected via The source of T0 is introduced.
  • Transistor of pull-up circuit 200 The drain and the source of T2 are connected to the first clock signal CKN and the Nth horizontal scan line G(N), respectively.
  • Transistor of pull-down circuit (400) The gate of T3 is connected to the output signal G(N+1) of the N+1th stage of the GOA unit, and the drain and the source thereof are respectively connected to the gate signal points of the pull-up circuit 200, This is the critical node Q(N), and the input DC low voltage VSS.
  • Such a circuit is designed mainly for a clock signal such as CKN duty cycle (Duty Cycle) setting needs less than 50% of the design, so that Q The potential at the (N) point is charged in several stages.
  • the pull-down maintaining circuit 500 includes a first clock signal (CKN) for inputting Transistors (T5, T19) and transistors of the second clock signal (XCKN) (T18, T9),
  • the first clock signal (CKN) and the second clock signal (XCKN) are complementary signals, and the first clock signal (CKN) and the second clock signal (XCKN) Under the control of the key node Q (N) and the gate output signal G (N) are maintained at a low potential until the next critical node (Q) is charged.
  • the forward scan control signal (UD) is set to a high potential, and the reverse scan control signal is set to a (DU) low potential.
  • the pull-up circuit (200) is activated to charge the key node Q(N) to output a high potential to the gate signal of the GOA unit of the stage.
  • G(N) the forward scan control signal
  • the reverse scan control signal (DU) is set to a high potential when the gate signal transmitted from the next stage GOA unit is high.
  • a pull-up circuit (200) is activated to charge the critical node Q(N) to output a high potential to the gate signal G(N) of the GOA unit of the stage.
  • the pull-down sustain circuit 500 includes a first transistor. T15, the gate thereof is connected to the first circuit point P(N), and the drain and the source thereof are respectively connected to the Nth horizontal scanning line G(N) and the input DC low voltage VSS; the second transistor T16, the gate thereof is connected to the first circuit point P(N), and the drain and the source thereof are respectively connected to the gate signal point Q(N) of the pull-up circuit 200 and the input DC low voltage VSS; the third transistor T17, the gate thereof is connected to the gate signal point Q(N) of the pull-up circuit 200, and the drain and the source thereof are respectively connected to the second circuit point K(N) and the first circuit point P(N); the fourth transistor T18, the gate thereof is connected to the second clock signal XCKN, and the drain and the source thereof are respectively connected to the first clock signal CKN and the first circuit point P(N); the fifth transistor T19, the gate thereof is connected to the first clock signal CKN, and the drain and the source thereof are respectively connected to the first clock signal
  • a new design of the voltage divider structure of the pull-down sustain circuit 500, in particular the thirteenth transistor T7 and the fifteenth transistor T8 can make the potentials of P(N) and K(N) lower than VSS during the action, effectively preventing leakage of Q(N) and G(N), while providing P(N) and K during non-active periods.
  • N A suitable high potential to ensure that P(N) and K(N) can produce higher potentials during non-active periods, which can well maintain the inactive effects of Q(N) and G(N). Low potential during the period to ensure the normal output of the circuit.
  • the potentials of P(N) and K(N) alternate with the potential changes of CKN and XCKN as they change.
  • Reset transistor of circuit 600 (T4) is to set the potential clear of the critical node Q(N) of the circuit to prevent the circuit from being accumulated due to the accumulation of charge for long-term operation of the circuit.
  • the accumulation of charge for a long time operation also affects the output of G(N), which may cause a severe ripple current (Ripple) of uncertainty, which can be reduced by setting the potential to zero by the reset circuit 600.
  • FIG. 2 is a circuit diagram of a gate driving unit circuit according to Embodiment 2 of the present application.
  • the second embodiment is a modification of the pull-down sustain circuit (500) based on the circuit of the first embodiment shown in FIG. T20 and transistor T21 pull down the P(N) and K(N) potentials of the first stage by enhancing Q(N), which effectively reduces the risk of failure of the pull-down sustain circuit.
  • FIG. 3 is a circuit diagram of a gate driving unit circuit according to Embodiment 3 of the present application.
  • the third embodiment is another modified example in the second embodiment shown in FIG. 2, in which the single-stage forward-reverse scanning circuit is changed into two-stage forward-reverse scanning, and the two-stage pull-up circuit 200 is respectively changed.
  • 210, pull-down circuits 400 and 410, and bootstrap capacitors (Cb) 300 and 310, Key nodes Q(N) and Q(N+1) are used to optimize circuit performance.
  • FIG. 4 is a circuit diagram of a gate driving unit circuit according to Embodiment 4 of the present application.
  • the fourth embodiment is another design for the pull-down sustain circuit 500 based on the third embodiment shown in FIG. Mainly new transistors T26 and transistor T27, namely circuits 700 and 710, ensure independence of the pull-down sustain circuit 500 during output and enhance the stability of the overall circuit.
  • FIG. 5 is a circuit diagram of another gate driving unit circuit according to Embodiment 4 of the present application.
  • a single input DC low voltage VSS is changed to a separate two-input DC low voltage VSS1 and an input DC low voltage on the basis of FIG. VSS2.
  • the pull-down circuit 400 is responsible for pulling the gate signal low to the low level at the first time, that is, when the gate signal is turned off, since VSS1 and VSS2 are a constant low potential, the absolute values of the potentials of both are slightly smaller than the absolute value of the clock signal.
  • FIG. 6 is a timing diagram of the gate driving unit circuit in the forward scanning mode according to Embodiment 4 of the present application.
  • CK(N) is the clock drive signal of the circuit. It can be seen that the duty cycle of the waveform shown here is less than 50% to realize the voltage pattern of the key nodes Q(N) and Q(N+1). The structure of the convex shape is presented, and the duty ratio needs to be adjusted according to the actual circuit to stabilize the output current and voltage.
  • the timing diagram here is for the N-type transistor. If it is a P-type transistor, the potential in the circuit is completely interchanged for the node high and low potentials, but the potential timing is unchanged.
  • FIG. 7 is a timing diagram of the gate driving unit circuit in the reverse scan mode according to Embodiment 4 of the present application.
  • the front and back timings of the horizontal scanning lines G(N+2), G(N+2), and G(N) and the key nodes Q(N) and Q(N+1) are exactly opposite to those shown in FIG. As for the other timings, it is roughly similar to the timing in the forward scanning mode shown in FIG. 6.
  • the present invention controls the scanning direction of the liquid crystal display by controlling the forward and reverse scanning control signals of the input of the pull-up control circuit, and determines that the GOA units sequentially output the scanning signals from the top to the bottom or The scanning signals are sequentially output from bottom to top to realize the diversity of scanning modes of the display device. Furthermore, the present invention ensures that the pull-down sustaining circuit is in a proper state during the active and inactive phases by the double-ended dependence of the circuit points P(N) and K(N) of the pull-down sustaining circuit and the new design of the three-stage voltage dividing structure. The potential can effectively maintain the gate signal point Q(N) of the pull-up circuit and the horizontal scanning line G(N) at a low potential.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)

Abstract

一种用于液晶显示之具正反双向扫描的栅极驱动电路，该栅极驱动电路包括级联的多个GOA单元，每级GOA单元包括上拉控制电路（100）、上拉电路（200）、下拉电路（400）、下拉维持电路（500）、重置电路（600）及自举电容（Cb），藉由上拉控制电路（100）之输入的正向及反向扫描控制讯号以达到控制液晶显示之扫描方向，决定让该些GOA单元是由上往下级依序输出扫描讯号或者是由下往上依序输出扫描讯号。并且藉由下拉维持电路（500）之电路点P(N)和K(N)的双端依赖，以及三段分压结构的全新设计，确保下拉维持电路（500）在作用和非作用期间处于合适的电位，能够有效的维持关键节点Q(N)及栅极输出讯号G(N)在低电位处于低电位保持。

Description

正反向扫描的栅极驱动电路 技术领域
本发明涉及液晶显示技术领域，特别是涉及一种用于液晶显示的GOA (Gate Driver on Array,阵列基板行扫描驱动)电路及液晶显示装置。
 背景技术
近年来，阵列基板行扫描驱动(GOA)技术已开始应用，可以运用液晶显示面板的原有制程将水平扫描线的驱动电路制作在显示区周围的基板上，使之能替代外接IC来完成水平扫描线的驱动。GOA技术可以减少外围驱动芯片的数量及其压封工序，使得平板显示（Flat Panel Display, FPD）成本降低，同时可以使得质量轻、厚度薄且外观对称的窄边框面板得以实现，显示模组更为紧凑有利于简化源极驱动电路的设计，提高显示面板的分辨率、增加实现柔性显示面板的可能性。
现有的GOA电路通常包括级联的多个GOA单元，每一级GOA单元对应驱动一级水平扫描线。GOA单元主要包括有上拉电路、上拉控制电路,下传电路、下拉电路和下拉维持电路,以及负责电位抬升的自举(Boast)电容。其中，上拉电路主要负责将时钟讯号(Clock)输出为栅极(Gate)讯号并且利用一控制电路以控制上拉电路的打开时间点，该上拉控制电路一般连接前级GOA单元传递过来的下传讯号或者栅极讯号。下拉电路负责在第一时间将栅极讯号拉低为低电位，即关闭栅极讯号。下拉维持电路则负责将栅极输出讯号和上拉电路的栅极讯号(通常称为Q点)维持在负电位,并且可利用一自举电容将Q点的电压再次抬升，这样有利于上拉电路的栅极输出。
虽然现有的GOA电路已有采用三段式分压的下拉维持电路，但是GOA电路的稳定性问题仍是显示装置目前面临的一个较大问题，主要由电路的器件稳定性引起。另一方面，使用者对于显示设备之扫描方式也具有多样性之需求。
 技术问题
本发明的目的是提供一种用于液晶显示之具正反双向扫描的栅极驱动电路, 所述栅极驱动电路包括级联的多个GOA单元，每级GOA单元包括上拉控制电路、上拉电路、下拉电路、下拉维持电路、重置电路及自举电容。通过对单级GOA电路设置正反向扫描之上拉控制电路，以此来实现GOA电路正反向扫描的功能，如果GOA电路之正向启始脉冲讯号没有正常工作时，可以用反向的启始脉冲讯号使GOA电路继续工作。
 技术解决方案
本发明藉由引入正向扫描控制讯号及反向扫描控制讯号以其DC电位对关键节点Q进行充电，此两个讯号相当于在一讯框(Frame)里是相反的讯号。如此可避免由级传讯号的延迟而影响关键节点Q的充电。
根据本发明的第一方面，本发明提供一种用于液晶显示装置之具双向扫描的栅极驱动电路, 所述栅极驱动电路包括级联的多个GOA单元，所述GOA单元产生一或多个扫描讯号并输出至一液晶显示装置，其中每个GOA单元包含:
一上拉控制电路, 其包含一正向扫描控制讯号输入端用于输入一由上往下级依序输出的扫描控制讯号、一反向扫描控制讯号输入端用于输入一由下往上级依序输出的扫描控制讯号、复数个栅极讯号输入端用于接收上一级GOA单元之栅极讯号和下一级GOA单元之栅极讯号及一输出端用于输出一上拉控制讯号;
一上拉电路, 其包含一连接于该关键节点Q(N)之输入端用以接收该上拉控制讯号、一时钟讯号输入端用于接收复数个时钟讯号及该级GOA单元之栅极讯号输出端，其中该上拉控制讯号系根据所述上拉控制电路之扫描控制讯号及上一级GOA单元或下一级GOA单元传递过来的栅极讯号而形成, 正向扫描时，当上一级GOA单元传递过来的栅极讯号为高电位时，启动上拉电路以对所述关键节点Q(N)进行充电,而反向扫描时，当下一级GOA单元传递过来的栅极讯号为高电位时，启动上拉电路以对所述关键节点Q(N)进行充电;
一自举电路,其包含一自举电容以将上述关键节点Q(N)的电压再次抬升;
一下拉电路,其包含一栅极讯号输入端用以接收下一级GOA单元传递过来的栅极讯号、一低电压输入端用以输入一直流低电压以及一连接于该关键节点Q(N)之输出端, 当接收下一级GOA单元传递过来的栅极讯号时以对所述关键节点Q(N)的电压进行放电;
一下拉维持电路,其包括复数个第一时钟讯号输入端用于输入第一时钟讯号、复数个第二时钟讯号输入端用于输入第二时钟讯号, 复数个连接端用以连接于该关键节点Q(N)以及GOA单元的讯号输出端，在第一时钟讯号及第二时钟讯号的控制下，使所述关键节点Q(N)及GOA单元的讯号输出端维持在低电位直到下次关键节点(Q)被充电, 所述GOA单元的讯号输出端耦合到与其对应的栅极线；以及
一重置电路, 对所述关键节点Q(N)进行电位清零的操作。
根据本发明的第二方面，本发明提供一种用于液晶显示装置的栅极驱动电路, 所述栅极驱动电路包括级联的多个GOA单元，所述GOA单元产生一或多个扫描讯号并依序输出至一液晶显示装置，其中每个GOA单元包含:
一上拉控制电路, 其包含串联的一第一晶体管和一第二晶体管，其中所述第一晶体管的漏极及所述第二晶体管的源极分别连接并输入一由上往下级依序输出的扫描控制讯号和一由下往上级依序输出的扫描控制讯号, 所述第一晶体管和所述第二晶体管的栅极分别连接并接收上一级GOA单元之栅极讯号和下一级GOA单元之栅极讯号;
一上拉电路, 其漏极接收复数个时钟讯号，而其栅极讯号点,即是关键节点Q(N)连接上述第一晶体管的源极及第二晶体管的漏极，根据所述上拉控制电路之扫描控制讯号及上一级GOA单元或下一级GOA单元传递过来的栅极讯号以对上述关键节点Q(N)的电压进行充电并控制上拉电路的打开时间然后输出该级GOA单元之栅极讯号,上述GOA单元之栅极讯号对应于液晶显示装置的第N级水平扫描线;
一自举电容(Cb),其将上述关键节点Q(N)的电压再次抬升;
一下拉电路,其漏极和源极分别连接上述关键节点Q(N)和一输入直流低电压, 其栅极连接并接收下一级GOA单元传递过来的栅极讯号以对所述关键节点Q(N)的电压进行放电;
一下拉维持电路,其包括用于输入第一时钟讯号之第三及第四晶体管及第二时钟讯号之第五及第六晶体管,所述第一时钟讯号及第二时钟讯号为反相讯号，在第一时钟讯号及第二时钟讯号的控制下，使所述关键节点Q(N)及栅极输出讯号维持在低电位直到下次关键节点(Q)被充电；以及
一重置电路, 对所述关键节点Q(N)进行电位清零的操作。
根据本发明的第三方面，本发明提供一种液晶显示装置包括所述用于液晶显示装置之具双向扫描的栅极驱动电路。
 有益效果
本发明提供之双向扫描的栅极驱动电路中，除了使显示设备之扫描方式具多样性之外，所述下拉维持电路新增晶体管以增强确保下拉维持电路在作用和非作用期间处于合适的电位，能够有效的维持关键节点Q(N)及栅极输出讯号G(N)在低电位处于低电位保持以达到电路性能的优化及稳定性。
 附图说明
图1为本申请实施例一之栅极驱动单元电路的电路图；
图2为本申请实施例二之栅极驱动单元电路的电路图；
图3为本申请实施例三之栅极驱动单元电路的电路图；
图4为本申请实施例四之栅极驱动单元电路的电路图；
图5为本申请实施例四之另一栅极驱动单元电路的电路图；
图6为本申请实施例四之栅极驱动单元电路在正向扫描模式下的时序图；
图7为本申请实施例四之栅极驱动单元电路在反向扫描模式下的时序图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施之特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「顶」、「底」、「水平」、「垂直」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。
请参阅图1，图1为本发明的一种用于液晶显示的栅极驱动电路, 所述栅极驱动电路包括级联的多个GOA单元，该第N级GOA单元包括上拉控制电路100、上拉电路200、下拉电路400、下拉维持电路500、重置电路600及自举电容(Cb)。如图所示，上拉控制电路100和重置电路600分别与上拉电路200之栅极讯号点Q(N)连接。下拉电路400、下拉维持电路500及自举电容(Cb)分别与上拉电路200之栅极讯号点Q(N)和所述第N级水平扫描线G(N)连接。上拉控制电路100之一晶体管 T1的栅极和第N-1级GOA单元的输出讯号G(N-1)连接，T1的源极是连接上拉电路200之栅极讯号点Q(N),正向扫描控制讯号UD经由T1的漏极引入。上拉控制电路100之另一晶体管 T0的栅极和第N+1级GOA单元的输出讯号G(N+1)连接，T0的漏极连接上拉电路200之栅极讯号点Q(N),而反向扫描控制讯号DU经由T0的源极引入。上拉电路200之晶体管 T2的漏极和源极分别连接第一时钟讯号CKN和所述第N级水平扫描线G(N)连接。下拉电路(400)之晶体管 T3的栅极和GOA单元的第N+1级的输出讯号G(N+1)连接，其漏极和源极分别连接上拉电路200之栅极讯号点, 即是关键节点Q(N),和输入直流低电压VSS。這樣电路的設計方式主要针对时钟讯号例如CKN的占空比(Duty Cycle)设置需要小于50%的设计，使得Q (N)点的电位会分为幾个阶段而充電, 並利于所述关键节点Q(N)第一时间的放电,确保下拉维持电路在作用和非作用期间处于合适的电位。所述下拉维持电路500包括用于输入第一时钟讯号(CKN) 之晶体管(T5, T19)及第二时钟讯号(XCKN)之晶体管(T18, T9), 所述第一时钟讯号(CKN)及第二时钟讯号(XCKN)为互补讯号，在第一时钟讯号(CKN)及第二时钟讯号(XCKN) 的控制下，使所述关键节点Q(N)及栅极输出讯号G(N)维持在低电位直到下次关键节点(Q)被充电。
正向扫描时，所述正向扫描控制讯号(UD)设为高电位，所述反向扫描控制讯号设为(DU)低电位， 当上一级GOA单元传递过来的栅极讯号为高电位时，启动上拉电路(200)以对所述关键节点Q(N)进行充电以输出高电位至上述该级GOA单元之栅极讯号G(N)。反向扫描时，所述正向扫描控制讯号(UD)设为低电位，所述反向扫描控制讯号(DU)设为高电位，当下一级GOA单元传递过来的栅极讯号为高电位时，启动上拉电路(200)以对所述关键节点Q(N)进行充电以输出高电位至上述该级GOA单元之栅极讯号G(N)。
如图1所示,下拉维持电路500包括第一晶体管 T15，其栅极连接第一电路点P(N)，其漏极和源极分别连接第N级水平扫描线G(N)和输入直流低电压VSS; 第二晶体管 T16，其栅极连接第一电路点P(N)，其漏极和源极分别连接上拉电路200之栅极讯号点Q(N)和输入直流低电压VSS; 第三晶体管 T17，其栅极连接上拉电路200之栅极讯号点Q(N)，其漏极和源极分别连接第二电路点K(N)和第一电路点P(N); 第四晶体管 T18，其栅极连接第二时钟讯号XCKN，其漏极和源极分别连接第一时钟讯号CKN和第一电路点P(N); 第五晶体管 T19，其栅极连接第一时钟讯号CKN，其漏极和源极分别连接第二时钟讯号XCKN和第二电路点K(N); 第六晶体管 T5，其源极连接第一电路点P(N，其栅极和漏极均连接第一时钟讯号CKN；第七晶体管 T6，其栅极连接第一电路点P(N)，其漏极和源极分别连接第一时钟讯号CKN和第一电路点P(N); 第八晶体管(T9)，其源极连接第二电路点K(N)，其栅极和漏极均连接第二时钟讯号XCKN；第九晶体管 T10，其栅极连第二电路点K(N)，其漏极和源极分别连接第二时钟讯号XCKN和第二电路点K(N); 第十晶体管 T13，其栅极连接第二电路点K(N)，其漏极和源极分别连接上拉电路200之栅极讯号点Q(N)和输入直流低电压VSS;第十一晶体管 T14，其栅极连接第二电路点K(N)，其漏极和源极分别连接第N级水平扫描线G(N)和输入直流低电压VSS; 第十二晶体管 T11和第十三晶体管 T7串联，其中第十二晶体管 T11的栅极连接第一电路点P(N)，其漏极和源极分别连接第一电路点P(N)和第十三晶体管 T7的漏极;第十三晶体管 T7的栅极连接所述关键节点Q(N)，其漏极和源极分别连接第一电路点P(N)和输入直流低电压VSS; 第十四晶体管 T12和第十五晶体管 T8串联，其中第十四晶体管 T12的栅极连接第二电路点K(N)，其漏极和源极分别连接第二电路点K(N)和第十五晶体管 T8的漏极，其中第十五晶体管 T8的栅极连接上拉电路200之栅极讯号点Q(N)，其漏极和源极分别连接第二电路点K(N)和输入直流低电压VSS。
下拉维持电路500之分压结构的全新设计，特别是第十三晶体管 T7和第十五晶体管 T8可令在作用期间的P(N)和K(N)的电位比VSS更低，有效的防止Q(N)和G(N)的漏电，同时非作用期间提供给P(N)和K(N)一个适当的高电位，以确保P(N)和K(N)在非作用期间能够产生较高的电位，这样可以很好的维持Q(N)和G(N)的在非作用期间低电位，保证电路的正常输出。P(N)和K(N)的电位会随CKN和XCKN在变化时的电位变化交替作用。
重置电路600之晶体管 (T4)是为了对电路的关键节点Q(N)进行电位清零的设置，防止电路长时间操作的电荷积累而致使电路失效。同时长时间操作的电荷积累也会对G(N)的输出造成影响，可能引起不确定性的严重波纹电流(Ripple)，经重置电路600将电位清零的设置可以降低此种情况发生。
请参阅图2，图2为本申请实施例二之栅极驱动单元电路的电路图。实施例二是在图1所示实施例一的电路基础上针对下拉维持电路(500)进行的一种修改，主要新增晶体管 T20和晶体管 T21以增强Q(N)在第一阶段的P(N)和K(N)电位下拉, 这样可以有效降低下拉维持电路的失效风险。
请参阅图3，图3为本申请实施例三之栅极驱动单元电路的电路图。实施例三是在图2所示的实施例二上的另外一种变型案例，将单级的正反向扫描电路改成双级的正反向扫描，分别改成双级的上拉电路200和210、下拉电路400和410及自举电容(Cb)300和310, 运用关键节点Q(N)和Q(N+1)以达到电路性能的优化。
请参阅图4，图4为本申请实施例四之栅极驱动单元电路的电路图。实施例四是在是在图3所示之实施例三的基础上针对下拉维持电路500进行的另一种设计方案。主要是新增晶体管 T26和晶体管 T27,即电路700和710以保证下拉维持电路500在输出期间的独立性，并且增强整体电路的稳定性。
请参阅图5，图5为本申请实施例四之另一栅极驱动单元电路的电路图。本实施例是在图4的基础上将单一输入直流低电压VSS改成分别的两输入直流低电压VSS1和输入直流低电压 VSS2。当下拉电路400负责在第一时间将栅极讯号拉低为低电位，即关闭栅极讯号时，因VSS1和VSS2是一个恒定的低电位，两者的电位绝对值均略小于时钟讯号的绝对值, 即CKN, XCKN 或 LC1或 LC2的绝对值, 因此可增强对Q(N)的电位下拉，使得栅极讯号的关闭机制更好，保证电路的长期稳定性操作。
请参阅图6，图6为本申请实施例四之栅极驱动单元电路在正向扫描模式下的时序图。CK(N)是电路的时钟驱动讯号，可以看出这里示意之波形的占空比为小于50%的设计，来实现关键节点Q(N)和Q(N+1)的充电之电压图型呈现凸字形的结构，然占空比需根据实际电路做调整占空比的大小，从而稳定输出电流和电压为主。从图中可以看出，这里时序图是针对N型晶体管而言，如果是P型晶体管，电路中的电位对于节点高低电位系全部互换，但是电位的时序不变。
请参阅图7，图7为本申请实施例四之栅极驱动单元电路在反向扫描模式下的时序图。其水平扫描线G(N+2)、G(N+2)和G(N)以及关键节点Q(N)和Q(N+1)的前后时序正好与图6中所示相反, 至于其他时序大致与图6中所示之正向扫描模式下的时序相似。
综上所述，本发明藉由上拉控制电路之输入的正向及反向扫描控制讯号以达到控制液晶显示之扫描方向，决定让该些GOA单元是由上往下级依序输出扫描讯号或者是由下往上依序输出扫描讯号而实现显示设备之扫描方式多样性的需求。 再者，本发明藉由下拉维持电路之电路点P(N)和K(N)的双端依赖，以及三段分压结构的全新设计，确保下拉维持电路在作用和非作用期间处于合适的电位，能够有效的维持上拉电路之栅极讯号点Q(N)和水平扫描线G(N)处于低电位保持。
虽然本发明已以较佳实施例揭露如上，但该较佳实施例并非用以限制本发明，该领域的普通技术人员，在不脱离本发明的精神和范围内，均可作如图1所示更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。以上所揭露的仅为本发明较佳实施例而已，当然不能以此来限定本发明之权利范围，因此等同变化，仍属本发明所涵盖的范围。

Claims (9)

  1. 一种用于液晶显示装置之具双向扫描的栅极驱动电路, 所述栅极驱动电路包括级联的多个GOA单元，所述GOA单元产生一或多个扫描讯号并输出至一液晶显示装置，其中每个GOA单元包含:
    一上拉控制电路, 其包含一正向扫描控制讯号输入端用于输入一由上往下级依序输出的扫描控制讯号、一反向扫描控制讯号输入端用于输入一由下往上级依序输出的扫描控制讯号、复数个栅极讯号输入端用于接收上一级GOA单元之栅极讯号和下一级GOA单元之栅极讯号及一输出端用于输出一上拉控制讯号;
    一上拉电路, 其包含一连接于该关键节点Q(N)之输入端用以接收该上拉控制讯号、一时钟讯号输入端用于接收复数个时钟讯号及该级GOA单元之栅极讯号输出端，其中该上拉控制讯号系根据所述上拉控制电路之扫描控制讯号及上一级GOA单元或下一级GOA单元传递过来的栅极讯号而形成, 正向扫描时，当上一级GOA单元传递过来的栅极讯号为高电位时，启动上拉电路以对所述关键节点Q(N)进行充电,而反向扫描时，当下一级GOA单元传递过来的栅极讯号为高电位时，启动上拉电路以对所述关键节点Q(N)进行充电;
    一自举电路,其包含一自举电容以将上述关键节点Q(N)的电压再次抬升;
    一下拉电路,其包含一栅极讯号输入端用以接收下一级GOA单元传递过来的栅极讯号、一低电压输入端用以输入一直流低电压以及一连接于该关键节点Q(N)之输出端, 当接收下一级GOA单元传递过来的栅极讯号时以对所述关键节点Q(N)的电压进行放电;
    一下拉维持电路,其包括复数个第一时钟讯号输入端用于输入第一时钟讯号、复数个第二时钟讯号输入端用于输入第二时钟讯号, 复数个连接端用以连接于该关键节点Q(N)以及GOA单元的讯号输出端，在第一时钟讯号及第二时钟讯号的控制下，使所述关键节点Q(N)及GOA单元的讯号输出端维持在低电位直到下次关键节点(Q)被充电, 所述GOA单元的讯号输出端耦合到与其对应的栅极线；以及
    一重置电路, 对所述关键节点Q(N)进行电位清零的操作。
  2. 一种用于液晶显示装置的栅极驱动电路, 所述栅极驱动电路包括级联的多个GOA单元，所述GOA单元产生一或多个扫描讯号并依序输出至一液晶显示装置，其中每个GOA单元包含：
    一上拉控制电路, 其包含串联的一第一晶体管和一第二晶体管，其中所述第一晶体管的漏极及所述第二晶体管的源极分别连接并输入一由上往下级依序输出的扫描控制讯号和一由下往上级依序输出的扫描控制讯号, 所述第一晶体管和所述第二晶体管的栅极分别连接并接收上一级GOA单元之栅极讯号和下一级GOA单元之栅极讯号；
    一上拉电路, 其漏极接收复数个时钟讯号，而其栅极讯号点,即是关键节点Q(N)连接上述第一晶体管的源极及第二晶体管的漏极，根据所述上拉控制电路之扫描控制讯号及上一级GOA单元或下一级GOA单元传递过来的栅极讯号以对上述关键节点Q(N)的电压进行充电并控制上拉电路的打开时间然后输出该级GOA单元之栅极讯号,上述GOA单元之栅极讯号对应于液晶显示装置的第N级水平扫描线；
    一自举电容(Cb),其将上述关键节点Q(N)的电压再次抬升；
    一下拉电路,其漏极和源极分别连接上述关键节点Q(N)和一输入直流低电压, 其栅极连接并接收下一级GOA单元传递过来的栅极讯号以对所述关键节点Q(N)的电压进行放电；
    一下拉维持电路,其包括用于输入第一时钟讯号之第三及第四晶体管及第二时钟讯号之第五及第六晶体管,所述第一时钟讯号及第二时钟讯号为反相讯号，在第一时钟讯号及第二时钟讯号的控制下，使所述关键节点Q(N)及栅极输出讯号维持在低电位直到下次关键节点(Q)被充电；以及
    一重置电路, 对所述关键节点Q(N)进行电位清零的操作。
  3. 如权利要求2所述的栅极驱动电路，其中所述下拉维持电路更包括: 第七晶体管，其栅极连接第一电路点(P(N))，其漏极和源极分别连接第N级水平扫描线和输入直流低电压; 第八晶体管，其栅极连接第一电路点(P(N))，其漏极和源极分别连接所述关键节点(Q(N))和输入直流低电压; 第九晶体管，其栅极连接所述关键节点(Q(N))，其漏极和源极分别连接第二电路点(K(N))和第一电路点(P(N)); 第十晶体管，其栅极连接第一电路点(P(N)，其漏极和源极分别连接第一时钟讯号和第一电路点(P(N)); 第十一晶体管，其栅极连第二电路点(K(N))，其漏极和源极分别连接第二时钟讯号和第二电路点(K(N)); 第十二晶体管，其栅极连接第二电路点(K(N))，其漏极和源极分别连接所述关键节点(Q(N))和输入直流低电压;第十三晶体管，其栅极连接第二电路点(K(N))，其漏极和源极分别连接第N级水平扫描线和输入直流低电压; 第十四晶体管和第十五晶体管串联，其中第十四晶体管的栅极连接第一电路点(P(N)，其漏极和源极分别连接第一电路点(P(N))和第十五晶体管的漏极，其中第十五晶体管的栅极连接所述关键节点(Q(N))，其漏极和源极分别连接第一电路点(P(N))和输入直流低电压; 第十六晶体管和第十七晶体管串联，其中第十六晶体管的栅极连接第二电路点(K(N))，其漏极和源极分别连接第二电路点(K(N))和第十七晶体管的漏极，其中第十七晶体管的栅极连接所述关键节点(Q(N))，其漏极和源极分别连接第二电路点(K(N))和输入直流低电压。
  4. 如权利要求2所述的栅极驱动电路，其中正向扫描时，所述由上往下级依序输出的扫描控制讯号设为高电位，所述由下往上级依序输出的扫描控制讯号设为低电位， 当上一级GOA单元传递过来的栅极讯号为高电位时，启动上拉电路以对所述关键节点Q(N)进行充电以输出高电位至上述该级GOA单元之栅极讯号。
  5. 如权利要求2所述的栅极驱动电路，其中反向扫描时，所述由上往下级依序输出的扫描控制讯号设为低电位，所述由下往上级依序输出的扫描控制讯号设为高电位，当下一级GOA单元传递过来的栅极讯号为高电位时，启动上拉电路以对所述关键节点Q(N)进行充电以输出高电位至上述该级GOA单元之栅极讯号。
  6. 如权利要求5所述的栅极驱动电路，其中所述下拉维持电路更包括两晶体管以增强所述关键节点Q(N)在第一阶段的P(N)和K(N)电位下拉的作用。
  7. 如权利要求6所述的栅极驱动电路，其特征在于，将单级GOA单元电路改成双级GOA单元电路，该双级GOA单元电路包括上拉控制电路(100)、上拉电路(200和210)、下拉电路(400和410)、下拉维持电路(500)、重置电路(600)及自举电容(300和310)。
  8. 如权利要求7所述的栅极驱动电路，其中将单一输入直流低电压改成分别的两输入直流低电压。
  9. 一种液晶显示装置，其包括如权利要求1所述的用于液晶显示的栅极驱动电路。
PCT/CN2015/070642 2014-12-30 2015-01-13 正反向扫描的栅极驱动电路 Ceased WO2016106847A1 (zh)

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