WO2020093466A1 - 一种驱动方法、驱动电路和显示装置 - Google Patents

一种驱动方法、驱动电路和显示装置 Download PDF

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Publication number
WO2020093466A1
WO2020093466A1 PCT/CN2018/117090 CN2018117090W WO2020093466A1 WO 2020093466 A1 WO2020093466 A1 WO 2020093466A1 CN 2018117090 W CN2018117090 W CN 2018117090W WO 2020093466 A1 WO2020093466 A1 WO 2020093466A1
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WIPO (PCT)
Prior art keywords
switch
common voltage
voltage
initializer
compensator
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PCT/CN2018/117090
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English (en)
French (fr)
Inventor
王明良
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惠科股份有限公司
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Priority to US16/982,544 priority Critical patent/US11138946B2/en
Publication of WO2020093466A1 publication Critical patent/WO2020093466A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • 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
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • 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
    • 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
    • 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
    • G09G2310/0291—Details of output amplifiers or buffers arranged for use in a driving circuit
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

Definitions

  • the present application relates to the field of display technology, and in particular, to a driving method, driving circuit, and display device.
  • Flat panel displays include thin film transistor liquid crystal displays (Thin Film Transistor-Liquid Crystal (TFT-LCD) and organic light-emitting diode (Organic Light-Emitting Diode, OLED) displays, etc.
  • TFT-LCD Thi Film Transistor-Liquid Crystal
  • OLED Organic Light-Emitting Diode
  • the thin film transistor liquid crystal display controls the rotation direction of the liquid crystal molecules to refract the light of the backlight module to generate a picture, which has many advantages such as thin body, power saving, no radiation and so on.
  • the organic light-emitting diode display is made of organic electroluminescent diodes, and has many advantages such as self-luminescence, short response time, high definition and contrast, flexible display and large-area full-color display.
  • the present application provides a driving method, driving circuit, and display device that actively compensate for the offset of a common voltage to ensure a display effect.
  • the present application provides a driving method, which is applied to a driving circuit.
  • the driving circuit includes a compensator and an initializer.
  • the steps include: the compensator obtains a common voltage at the output terminal of the initializer; The value of is compared with a preset threshold; the value of the common voltage is compensated according to the comparison result.
  • the present application also discloses a driving circuit, including: an initializer, which outputs a common voltage; a compensator, which is coupled to the initializer; a controller, which collects the common voltage output by the initializer, when the After the common voltage is less than the preset threshold, the compensator is controlled to compensate the value of the common voltage.
  • the controller includes a first switch and a second switch, the first switch is connected to the control of the initializer, and when the collected common voltage is greater than or equal to a preset threshold, the normalizer is controlled to be normal Work; the second switch is connected to the compensator control, when the collected common voltage is less than the preset threshold, the compensator is controlled to work, to compensate the value of the common voltage.
  • the controller includes: a standard voltage circuit that provides a reference voltage; a third switch, a source of the third switch is connected to the standard voltage circuit, and a gate of the third switch is connected to the acquisition
  • the common voltage output by the initiator, the drain control is connected to the compensator; when the common voltage is less than the reference voltage, the third switch controls the compensator to compensate the value of the common voltage .
  • the controller further includes: a standard voltage circuit that provides a reference voltage; a third switch, a source of the third switch is connected to the standard voltage circuit, and a gate of the third switch is connected to the Collecting the common voltage output by the initializer, the drain of the third switch controls to connect the first switch and the second switch.
  • the standard voltage circuit includes: a first resistor and a second resistor connected in series between a high-level power supply voltage and a low-level voltage, and the source of the third switch is connected to the first Between the resistor and the second resistor; at least one of the first resistor and the second resistor is an adjustable resistor.
  • the standard voltage circuit includes a third resistor, one end of the third resistor is connected to the drain of the third switch, and one end is grounded.
  • the initializer includes an initial memory that stores an initial value of a common voltage; the compensator includes a compensation memory that stores a compensation value of a common voltage; the output end of the compensation memory and the output of the initial memory Are coupled to compensate the initial value of the common voltage.
  • the initializer includes: an initial memory, which stores an initial signal code corresponding to the value of the initial common voltage; a digital-to-emulator, which converts the initial signal code transmitted from the initial memory into an analog voltage Output current amplifier to output the common voltage; the output end of the initial memory is coupled to the input end of the digital to simulator, and the output end of the digital to simulator is coupled to the input end of the output current amplifier; The output terminal of the output current amplifier is the output terminal of the initializer; the compensator includes a compensation memory, and the compensation memory stores a compensation signal code; the output terminal of the compensation memory and the digital conversion of the initializer The input end of the simulator is coupled; the output end of the initial memory is coupled to the input end of the digital-to-simulator through a first switch, and the output end of the compensation memory is connected to the digital end of the initializer through a second switch The input terminal of the transfer simulator is coupled.
  • the driving circuit includes a control chip, the initiator, compensator, first switch and second switch are all set on the control chip, and the standard voltage circuit, third resistor and third switch are set Outside the control chip.
  • the present application also discloses a display device including a display panel; the display panel includes: a first substrate; a second substrate, which is disposed opposite to the first substrate; an array layer, formed on the first substrate; An electrode is formed on the second substrate; and a driving circuit as described above.
  • the improved drive circuit Add a compensator to couple with the initializer.
  • the controller collects the common voltage output from the initializer.
  • the control The compensator compensates the value of the common voltage, and actively compensates the value of the common voltage through the comparison result to reduce the offset and ensure the display effect.
  • FIG. 1 is a schematic diagram of steps of a method for driving a display panel according to an embodiment of the present application
  • FIG. 2 is a schematic diagram of a liquid crystal display panel according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a driving circuit according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a driving circuit according to an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a display device according to an embodiment of the present application.
  • connection should be understood in a broad sense, for example, it can be fixed connection or detachable Connected, or connected integrally; either mechanically or electrically; directly connected, or indirectly connected through an intermediary, or internally connected between two components.
  • installation should be understood in a broad sense, for example, it can be fixed connection or detachable Connected, or connected integrally; either mechanically or electrically; directly connected, or indirectly connected through an intermediary, or internally connected between two components.
  • an embodiment of the present application discloses a driving method, which is applied to a driving circuit 140.
  • the driving circuit 140 includes a compensator 160 and an initializer 150.
  • the steps include:
  • the compensator 160 obtains the common voltage at the output of the initializer 150;
  • the preset threshold is set by the inventors in the field according to specific conditions. If the preset threshold is exceeded, the common voltage is considered to be beyond the tolerable range, then compensation is required; the compensator 160 obtains the common voltage at the output of the initializer 150, and The value of the common voltage is compared with a preset threshold value. If the value of the common voltage is less than the preset threshold value, the common voltage is compensated. If the value of the common voltage is equal to the preset threshold value, the output is normal as usual.
  • a driving circuit 140 is disclosed with reference to FIGS. 2 to 4.
  • the driving circuit 140 includes: an initializer 150 that outputs a common voltage to the common electrode 130;
  • the controller 150 is coupled to the controller 170.
  • the controller 170 collects the common voltage output by the initializer 150.
  • the compensator 160 is controlled to compensate the value of the common voltage.
  • the liquid crystal panel is divided into a lower array layer 120 (array) and an upper common electrode 130 (common).
  • the common voltage of the upper common electrode 130 is usually called VCOM, and as the resolution of the liquid crystal panel increases The higher the size, the larger the size, and the larger the current pumping of the common electrode 130. Due to the existence of the internal impedance of the driving circuit 140, as the current increases, the VCOM decreases more.
  • the VCOM voltage will also be affected by the array layer 120, the array layer 120 is used to transfer the data of the display screen, then the VCOM voltage will also have different offset conditions according to the different screens displayed, the changes we made Yes, a compensator 160 is added to couple with the initializer 150, and the common voltage output by the initializer 150 is collected by the controller 170.
  • the control compensator 160 compensates the value of the common voltage, and actively compensates the value of the common voltage through the comparison result to reduce the offset and ensure the display effect.
  • the controller 170 includes a first switch T1 and a second switch T2.
  • the first switch T1 is control-connected to the initiator 150, and controls the initiator 150 when the collected common voltage is greater than or equal to a preset threshold Normal operation;
  • the second switch T2 is connected to the compensator 160, and when the collected common voltage is less than the preset threshold, the compensator 160 is controlled to work to compensate the value of the common voltage;
  • the switch is generally a metal oxide semiconductor field effect transistor (Metal Oxide Semiconductor (MOS)
  • MOS Metal Oxide Semiconductor
  • the control terminal of the switch is a positive polarity switch generally refers to a P-MOS tube
  • the control terminal of the switch is a negative polarity switch generally refers to It is an N-MOS tube.
  • MOS Metal Oxide Semiconductor
  • the control terminal of the first switch is turned on with negative polarity
  • the control terminal of the second switch T2 is turned on with positive polarity.
  • the setting of the switch mainly considers the main controller, because the main controller sends different level signals through the comparison result to control the first switch T1 and the second switch T2 to turn on and off, that is, to decide whether to compensate ,
  • control the initializer 150 When the collected common voltage is greater than or equal to the preset threshold, control the initializer 150 to work normally; when the collected common voltage is less than the preset threshold, control the compensator 160 to work to compensate the value of the common voltage;
  • the setting can ensure that the initial memory 151 and the compensator 160 work separately without affecting each other.
  • the controller 170 includes a standard voltage circuit and a third switch T3; a standard voltage circuit 171 provides a reference voltage; a source S of the third switch is connected to the standard voltage circuit 171, and a gate G of the third switch To the common voltage output by the acquisition initiator 150, the drain D controls to connect the compensator 160; when the common voltage is less than the reference voltage, the third switch controls the compensator 160 to compensate the value of the common voltage.
  • the switch is generally a metal oxide semiconductor field effect transistor (Metal, Oxide, Semiconductor, MOS), the switch with a positive control terminal generally refers to a P-MOS tube, and the switch with a negative control terminal generally refers to a switch with a negative polarity It is an N-MOS tube, of course, it can also be other devices that achieve similar functions; the control terminal of the third switch is negatively conductive.
  • MOS metal oxide semiconductor field effect transistor
  • a standard voltage circuit 171 is provided in the controller 170, which mainly provides a comparison between the reference voltage and the common voltage output by the initiator 150.
  • the third switch is an N-MOS, the source is connected to the standard voltage circuit 171, and the gate is connected to the collector
  • the common voltage output by the initiator 150 is connected to the compensator 160 through the drain control; when the common voltage is less than the reference voltage, the third switch controls the compensator 160 to compensate the value of the common voltage.
  • the standard voltage circuit 171 includes: a first resistor R1 and a second resistor R2 connected in series between a high-level power supply voltage VAA and a low-level voltage, and the source of the third switch is connected to the first Between a resistor and a second resistor; at least one of the first resistor and the second resistor is an adjustable resistor, and the first resistor R1 and the second resistor R2 adjust a preset threshold.
  • the standard voltage circuit includes a third resistor. As shown in FIG. 4, one end of the third resistor R3 is connected to the drain of the third switch T3, and one end is grounded.
  • the third resistor is set here. Connect the drain terminal of the third switch and connect one end to ground to ensure that the control signal will not always be 0 volts.
  • the initializer 150 includes an initial memory 151 that stores the initial value of the common voltage; the compensator 160 includes a compensation memory 161 that stores the compensation value of the common voltage; the output end of the compensation memory 161 and the initial memory 151 The output is coupled to compensate for the initial value of the common voltage.
  • the initial storage has the initial value of the common voltage
  • the compensation memory 161 stores the compensation value of the common voltage
  • the output end of the compensation memory 161 is coupled to the output end of the initial memory 151
  • the controller 170 transmits related signals
  • the compensation memory After receiving 161, whether to compensate the initial value of the common voltage.
  • the initializer 150 includes: an initial memory 151, which stores an initial signal code corresponding to the value of the initial common voltage; a digital-to-simulator 152, which converts the initial signal code transmitted from the initial memory 151 into an analog Voltage; output current amplifier 153, output common voltage; the output of the initial memory 151 is coupled to the input of the digital to simulator 152, the output of the digital to simulator 152 is coupled to the input of the output current amplifier 153; the output current The output of the amplifier 153 is the output of the initializer 150; the compensator 160 includes: a compensation memory 161 that stores the compensation signal code; the output of the compensation memory 161 is coupled to the input of the digital-to-simulator 152 of the initializer 150; The output terminal of the initial memory 151 is coupled to the input terminal of the digital-to-simulator 152 via a first switch, and the output terminal of the compensation memory 161 is coupled to the input terminal of the digital-to-simulator 152 through the second
  • the controller 170 when the common voltage shifts, the controller 170 will recognize it for the first time and make a judgment. If the difference between the output voltage and the common voltage is too large and the common voltage is too low, the controller 170 will start to use
  • the compensation signal code stored in the compensation memory 161 stores the compensation signal code with a larger value, that is, to compensate for the voltage drop caused by the back-end load pumping by increasing the signal code.
  • the driving circuit 140 includes a control chip 180, an initiator 150, a compensator 160, a first switch T1 and a second switch T2 are all provided on the control chip 180, a standard voltage circuit, a third resistor R3 and a third The three switches T3 are arranged outside the control chip 180.
  • the correlator on the control chip 180 is mainly implemented in conjunction with an external circuit.
  • the common voltage is used to obtain different control signal states to switch the initial memory 151 and the compensation memory 161.
  • the circuit is simple and easy to implement.
  • controller 170 further includes:
  • Standard voltage circuit 171 providing reference voltage
  • the source of the third switch is connected to the standard voltage circuit
  • the gate of the third switch is connected to the common voltage output by the acquisition initiator 150
  • the drain of the third switch is controlled to connect the first switch and the second switch.
  • the switch is generally a metal oxide semiconductor field effect transistor (Metal, Oxide, Semiconductor, MOS), the switch with a positive control terminal generally refers to a P-MOS tube, and the switch with a negative control terminal generally refers to a switch with a negative polarity It is an N-MOS tube, of course, it can also be other devices that achieve similar functions; the control terminal of the third switch is negatively conductive.
  • MOS metal oxide semiconductor field effect transistor
  • the common voltage output by the initializer 150 is collected back to the gate G of the third switch T3, that is, the gate voltage Vg is equal to the common voltage output by the initializer 150, and the voltage at the source of T3 It is obtained by dividing the supply voltage VAA by the first resistor R1 and the second resistor R2.
  • the compensation memory 161 stores the compensation signal code with a larger value. The signal code is increased to compensate for the voltage drop caused by the current drawn by the back-end load. .
  • the controller 170 mainly realizes the active compensation of the offset of the common voltage through a hardware circuit, and uses the common voltage to obtain different control signal states to switch the initial memory 151 and the compensation memory 161.
  • the circuit is simple and easy to implement, simple and easy to implement, and is very suitable for the common voltage Drift occasions.
  • a display device 400 is provided with reference to FIGS. 2 and 5 and includes a display panel 200.
  • the display panel includes: a first substrate; a second substrate disposed opposite to the first substrate; an array The layer is formed on the first substrate; the common electrode is formed on the second substrate; the driving circuit 140 as above.
  • TN panel full name Twisted Nematic, namely twisted nematic panel
  • IPS panel In-Plane Switching, plane switching
  • VA panel Multi-domain Vertica Alignment, multi-quadrant vertical alignment technology

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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)

Abstract

一种驱动方法、驱动电路（140）和显示装置（400）。驱动电路（140）包括：输出公共电压的初始器（150），与初始器（150）耦接的补偿器（160），以及采集初始器（150）输出的公共电压的控制器（170），当公共电压小于预设阈值后，控制器（170）控制补偿器（160）对公共电压的值进行补偿。

Description

一种驱动方法、驱动电路和显示装置
本申请要求于2018年11月9日提交中国专利局，申请号为CN201811331789.3，发明名称为“一种驱动方法、驱动电路和显示装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及显示技术领域，尤其涉及一种驱动方法、驱动电路和显示装置。
背景技术
这里的陈述仅提供与本申请有关的背景信息，而不必然地构成现有技术。
随着科技的发展和进步，平板显示器由于具备机身薄、省电和辐射低等热点而成为显示器的主流产品，得到了广泛应用。平板显示器包括薄膜晶体管液晶显示器(Thin Film Transistor-Liquid Crystal Display，TFT-LCD)和有机发光二极管(Organic Light-Emitting Diode，OLED)显示器等。其中，薄膜晶体管液晶显示器通过控制液晶分子的旋转方向，以将背光模组的光线折射出来产生画面，具有机身薄、省电、无辐射等众多优点。而有机发光二极管显示器是利用有机电致发光二极管制成，具有自 发光、响应时间短、清晰度与对比度高、可实现柔性显示与大面积全色显示等诸多优点。
市场上的显示面板大部分都采用最初研发的驱动电路，控制过程都是比较简单，驱动电路内部存在阻抗，由于显示面板的解析度越来越高，尺寸越来越大，导致无法再保证显示面板的显示效果。
技术解决方案
本申请提供一种主动补偿公共电压的偏移，保证显示效果的驱动方法、驱动电路和显示装置。
为实现上述目的，本申请提供了一种驱动方法，应用在一种驱动电路，所述驱动电路包括补偿器和初始器，步骤包括：补偿器获取初始器输出端的公共电压；将所述公共电压的值与预设阈值进行比较；根据对比结果对所述公共电压的值进行补偿。
本申请还公开了一种驱动电路，包括:初始器，输出公共电压；补偿器，与所述初始器耦接；控制器,所述控制器采集所述初始器输出的公共电压，当所述公共电压小于预设阈值后，控制所述补偿器对所述公共电压的值进行补偿。
可选的，所述控制器包括第一开关和第二开关，所述第一开关与所述初始器控制连接，当采集到的公共电压大于或等于预设阈值时，控制所述初始器正常工作；所述第二开关与所述补偿器控制 连接，当采集到的公共电压小于所述预设阈值时，控制所述补偿器工作，对所述公共电压的值进行补偿。
可选的，所述控制器包括：标准电压电路，提供参考电压；第三开关，所述第三开关的源极与所述标准电压电路连接，所述第三开关的栅极与所述采集初始器输出的公共电压，所述漏极控制连接所述补偿器；当所述的公共电压小于所述参考电压时，所述第三开关控制所述补偿器对所述公共电压的值进行补偿。
可选的，所述控制器还包括：标准电压电路，提供参考电压；第三开关，所述第三开关的源极与所述标准电压电路连接，所述第三开关的栅极与所述采集初始器输出的公共电压，所述第三开关的漏极控制连接所述第一开关和第二开关。
可选的，所述标准电压电路包括：串联在一高电平的供电电压和低电平电压之间的第一电阻和第二电阻，所述第三开关的源极连接到所述第一电阻和第二电阻之间；所述第一电阻和第二电阻中至少一个为可调电阻。
可选的，所述标准电压电路包括第三电阻，所述第三电阻的一端与所述第三开关的漏极连接，一端接地。
可选的，所述初始器包括初始存储器，储存有公共电压的初始值；所述补偿器包括补偿存储器，存储有公共电压的补偿值；所述补偿存储器的输出端与所述初始存储器的输出端耦接，以对所述公共电压的初始值进行补偿。
可选的，所述初始器包括：初始存储器，储存有对应的初始的公共电压的值的初始信号编码；数字转模拟器，将所述初始存储器传送过来的所述初始信号编码转化成模拟电压；输出电流放大器，输出所述公共电压；所述初始存储器的输出端与所述数字转模拟器的输入端耦接，所述数字转模拟器的输出端与输出电流放大器的输入端耦接；所述输出电流放大器的输出端即为所述初始器的输出端；所述补偿器包括补偿存储器，所述补偿存储器存储补偿信号编码；所述补偿存储器的输出端与所述初始器的数字转模拟器的输入端耦接；所述初始存储器的输出端通过第一开关与所述数字转模拟器的输入端耦接，所述补偿存储器的输出端通过第二开关与所述初始器的数字转模拟器的输入端耦接。
可选的，所述驱动电路包括控制芯片，所述初始器、补偿器、第一开关和第二开关都设置在所述控制芯片上，所述标准电压电路、第三电阻和第三开关设置在所述控制芯片外。
本申请还公开了一种显示装置，包括显示面板；所述显示面板包括：第一基板；第二基板，与所述第一基板相对设置；阵列层，形成于所述第一基板上；共电极，形成于所述第二基板上；及如上所述的一种驱动电路。
相对之前沿用的驱动电路，随着液晶面板的解析度越来越高，尺寸越来越大，共电极的电流抽载越来越大，由于驱动电路内部阻抗的存在，那么随着电流越大，公共电压下降就会越多，公共电压 会有不同的偏移状况发生，影响显示效果。同时因为公共电压也会受到阵列层的影响，阵列层是用来传递显示画面的数据，那么会随着显示的画面不同，公共电压也会有不同的偏移状况发生；改进后的驱动电路，增加一个补偿器，与初始器进行耦接，控制器采集所述初始器输出的公共电压，在驱动电路的公共电压下降越来越多的时候，也就是公共电压小于预设阈值后，控制所述补偿器对所述公共电压的值进行补偿，通过对比结果主动补偿公共电压的值来减少偏移，保证显示效果。
附图说明
所包括的附图用来提供对本申请实施例的理解，其构成了说明书的一部分，例示本申请的实施方式，并与文字描述一起来阐释本申请的原理。显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。在附图中：
图1是本申请实施例一种显示面板的驱动方法步骤的示意图；
图2是本申请实施例一种液晶显示面板的示意图；
图3是本申请实施例一种驱动电路器的示意图；
图4是本申请实施例一种驱动电路的示意图；
图5是本申请实施例一种显示装置的示意图。
本申请的实施方式
这里所公开的具体结构和功能细节仅仅是代表性的，并且是描述本申请的示例性实施例的目的。但是本申请可以通过许多替换形式来具体实现，并且不应当被解释成仅仅受限于这里所阐述的实施例。
在本申请的描述中，需要理解的是，术语“中心”、“横向”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”仅描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本申请的描述中，除非另有说明，“多个”的含义是两个或两个以上。另外，术语“包括”及其任何变形，意图在于覆盖不排他的包含。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而 言，可以具体情况理解上述术语在本申请中的具体含义。
这里所使用的术语仅仅是为了描述具体实施例而不意图限制示例性实施例。除非上下文明确地另有所指，否则这里所使用的单数形式“一个”、“一项”还意图包括复数。还应当理解的是，这里所使用的术语“包括”和/或“包含”规定所陈述的特征、整数、步骤、操作、单元和/或组件的存在，而不排除存在或添加一个或更多其他特征、整数、步骤、操作、单元、组件和/或其组合。
下面参考附图和较佳的实施例对本申请作详细说明。
如图1和图3所示，本申请实施例公布了一种驱动方法，应用在一种驱动电路140，驱动电路140包括补偿器160和初始器150，步骤包括：
S11：补偿器160获取初始器150输出端的公共电压；
S12：将公共电压的值与预设阈值进行比较；
S13：根据对比结果对公共电压的值进行补偿。
本方案中，预设阈值由本领域的发明人根据具体的情况设置，超出预设阈值则认为公共电压超出容忍的范围，那么就需要进行补偿；补偿器160获取初始器150输出端的公共电压，将公共电压的值与预设阈值进行比较，公共电压的值小于预设阈值值，则对公共电压进行补偿，公共电压的值等于预设阈值，则按照平常正常输出。
作为本申请的另一实施例，参考图2至4公布了一种驱动电路140，如图3所示驱动电路140包括：初始器150，输出公共电 压到共电极130；补偿器160，与初始器150耦接；控制器170,控制器170采集初始器150输出的公共电压，当公共电压小于预设阈值后，控制补偿器160对公共电压的值进行补偿。
本方案中，如图2，液晶面板分为下层的阵列层120(array)和上层的共电极130(common)，上层共电极130的公共电压通常叫做VCOM，而随着液晶面板的解析度越来越高，尺寸越来越大，共电极130的电流抽载越来越大，由于驱动电路140内部阻抗的存在，那么随着电流越大，VCOM下降就会越多。同时因为VCOM电压也会受到阵列层120的影响，阵列层120是用来传递显示画面的数据，那么会随着显示的画面不同，VCOM电压也会有不同的偏移状况发生，我们做的改变有，增加一个补偿器160，与初始器150进行耦接，通过控制器170采集初始器150输出的公共电压，在驱动电路140的公共电压下降越来越多的时候，也就是公共电压小于预设阈值后，控制补偿器160对公共电压的值进行补偿，通过对比结果主动补偿公共电压的值来减少偏移，保证显示效果。
本实施例可选的，控制器170包括第一开关T1和第二开关T2，第一开关T1与初始器150控制连接，当采集到的公共电压大于或等于预设阈值时，控制初始器150正常工作；第二开关T2与补偿器160控制连接，当采集到的公共电压小于预设阈值时，控制补偿器160工作，对公共电压的值进行补偿；
其中,该开关一般为金属氧化物半导体场效应晶体管(Metal  Oxide Semiconductor，MOS),开关的控制端为正极性的开关一般指的是P-MOS管,开关的控制端为负极性的开关一般指的是N-MOS管,当然,也可以是其他实现相似功能的器件；第一开关的控制端是负极性导通的，第二开关T2的控制端是正极性导通的。
本方案中，开关的设置主要考虑到主控器，因为主控器通过对比结果传送不同的电平信号控制第一开关T1和第二开关T2的接通和断开，也就是决定是否进行补偿，当采集到的公共电压大于或等于预设阈值时，控制初始器150正常工作；当采集到的公共电压小于预设阈值时，控制补偿器160工作，对公共电压的值进行补偿；开关的设置可以保证初始存储器151和补偿器160分开工作，互不影响。
本实施例可选的，控制器170包括标准电压电路和第三开关T3；标准电压电路171，提供参考电压；第三开关的源极S与标准电压电路171连接，第三开关的栅极G与采集初始器150输出的公共电压，漏极D控制连接补偿器160；当公共电压小于参考电压时，第三开关控制补偿器160对公共电压的值进行补偿。
其中,该开关一般为金属氧化物半导体场效应晶体管(Metal Oxide Semiconductor，MOS),开关的控制端为正极性的开关一般指的是P-MOS管,开关的控制端为负极性的开关一般指的是N-MOS管,当然,也可以是其他实现相似功能的器件；第三开关的控制端是负极性导通的。
本方案中，控制器170中设置标准电压电路171，主要提供参考电压与初始器150输出的公共电压进行对比，第三开关是N-MOS，源极与标准电压电路171连接，栅极与采集初始器150输出的公共电压，漏极控制连接补偿器160；当公共电压小于参考电压时，第三开关控制补偿器160对公共电压的值进行补偿。
本实施例可选的，标准电压电路171包括：串联在一高电平的供电电压VAA和低电平电压之间的第一电阻R1和第二电阻R2，第三开关的源极连接到第一电阻和第二电阻之间；第一电阻和第二电阻中至少一个为可调电阻，第一电阻R1和第二电阻R2调节的是预设阈值。
本方案中，通过调整第一电阻和第二电阻就可以设置不同的补偿标准，简单易行，当公共电压与输出电压差值较少的时候，也就是说电压偏移较少的时候，可以将第一电阻的阻值调大，第二电阻的阻值调小，这样补偿的信号编码就会启用相对较小的来完成补偿，提供精确度。
本实施例可选的，标准电压电路包括第三电阻，如图4所示，第三电阻R3一端与第三开关T3的漏极连接，一端接地。
本方案中，如果由第三开关漏极接地，那么所获得的信号将一直都是0伏特,那么开关1得到的是0伏特的控制信号会一直处于开通状态，故此处设置第三电阻，一端连接第三开关的漏极端，一端接地，保证控制信号不会一直都是O伏特。
本实施例可选的，初始器150包括初始存储器151，储存有公共电压的初始值；补偿器160包括补偿存储器161，存储有公共电压的补偿值；补偿存储器161的输出端与初始存储器151的输出端耦接，以对公共电压的初始值进行补偿。
本方案中，初始储存器有公共电压的初始值，补偿存储器161存储有公共电压的补偿值；补偿存储器161的输出端与初始存储器151的输出端耦接，控制器170传输相关信号，补偿存储器161接收后以对公共电压的初始值进行是否补偿。
本实施例可选的，初始器150包括：初始存储器151，储存有对应的初始的公共电压的值的初始信号编码；数字转模拟器152，将初始存储器151传送过来的初始信号编码转化成模拟电压；输出电流放大器153，输出公共电压；初始存储器151的输出端与数字转模拟器152的输入端耦接，数字转模拟器152的输出端与输出电流放大器153的输入端耦接；输出电流放大器153的输出端即为初始器150的输出端；补偿器160包括：补偿存储器161，存储补偿信号编码；补偿存储器161的输出端与初始器150的数字转模拟器152的输入端耦接；初始存储器151的输出端通过第一开关与数字转模拟器152的输入端耦接，补偿存储器161的输出端通过第二开关与初始器150的数字转模拟器152的输入端耦接。
本方案中，当公共电压产生偏移的时候，控制器170会第一时间识别到，进行判断，如果输出电压与公共电压的差值过大，公 共电压过低，那么控制器170将开始使用补偿存储器161中存储的补偿信号编码，这里面存储的是数值较大的补偿信号编码，即通过信号编码增大的方式去补偿由于后端负载抽载造成的电压下降。
本实施例可选的，驱动电路140包括控制芯片180，初始器150、补偿器160、第一开关T1和第二开关T2都设置在控制芯片180上，标准电压电路、第三电阻R3和第三开关T3设置在控制芯片180外。
本方案中，控制芯片180上的相关器主要配合外部电路的方式实现，利用公共电压得到不同的控制信号状态去切换初始存储器151与补偿存储器161，电路简单易于实现。
作为本申请的另一实施例，参考图4与上述实施例不同的是，控制器170还包括：
标准电压电路171，提供参考电压；
第三开关T3，第三开关的源极与标准电压电路连接，第三开关的栅极与采集初始器150输出的公共电压，第三开关的漏极控制连接第一开关和第二开关。
其中,该开关一般为金属氧化物半导体场效应晶体管(Metal Oxide Semiconductor，MOS),开关的控制端为正极性的开关一般指的是P-MOS管,开关的控制端为负极性的开关一般指的是N-MOS管,当然,也可以是其他实现相似功能的器件；第三开关的控制端是负极性导通的。
本方案中，如图4所示，将初始器150输出的公共电压采集回第三开关T3的栅极G，即栅极电压Vg等于初始器150输出的公共电压，T3的源极处的电压是由供电电压VAA经第一电阻R1和第二电阻R2分压得到，源极电压Vs等于供电电压乘以第二阻值R2除以第一电阻R1与第二电阻R2之和，即Vs＝VAA*R2/(R1+R2)，由于T3是P-MOS管，所以当Vg小于Vs时，T3导通，当公共电压降低到一定标准后，T3会导通。T3导通后，T3上的电压会从0伏特切换Vs＝VAA*R2/(R1+R2)，将第三电阻R3上的电压命名为控制信号(Control)，然后这个信号会接入VCOM IC内部的第一开关T1和第二开关T3的栅极，由于第一开关T1是P-MOS，所以第一开关会断开，而第二开关是N-MOS，所以第二开关会导通，这样就完成了公共电压降低然后接通补偿存储器161的目的，补偿存储器161中存储的是数值较大的补偿信号编码，通过信号编码增大的方式去补偿由于后端负载抽电流造成的电压下降。当输出电压没有偏移或偏移较少的情况下，Vg大于Vs，第三开关不打开，那么第三电阻R3的电压控制信号就是0伏特，这样第一开关会导通，第二开关会断开，这样就是继续使用初始存储器151中的信号编码不会影响正常操作。控制器170主要通过硬件电路的方式实现主动补偿公共电压的偏移，利用公共电压得到不同的控制信号状态去切换初始存储器151和补偿存储器161，电路简单易于实现，简便易行，非常适合公共电压漂移的场合。
作为本申请的另一实施例，参考图2和图5所示提供了一种显示装置400，包括显示面板200，显示面板包括：第一基板；第二基板，与第一基板相对设置；阵列层，形成于第一基板上；共电极，形成于第二基板上；如上的驱动电路140。
需要说明的是，本方案中涉及到的各步骤的限定，在不影响具体方案实施的前提下，并不认定为对步骤先后顺序做出限定，写在前面的步骤可以是在先执行的，也可以是在后执行的，甚至也可以是同时执行的，只要能实施本方案，都应当视为属于本申请的保护范围。
本申请的技术方案可以广泛TN面板(全称为Twisted Nematic，即扭曲向列型面板)、IPS面板(In-Plane Switching，平面转换)、VA面板(Multi-domain Vertica Alignment，多象限垂直配向技术)，当然，也可以是其他类型的面板，适用即可。
以上是结合具体的优选实施方式对本申请所作的详细说明，不能认定本申请的具体实施只局限于这些说明。对于本申请所属技术领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本申请的保护范围。

Claims (18)

  1. 一种驱动方法，应用在一种驱动电路，所述驱动电路包括补偿器和初始器，步骤包括：
    补偿器获取初始器输出端的公共电压；
    将所述公共电压的值与预设阈值进行比较；
    根据对比结果对所述公共电压的值进行补偿。
  2. 一种驱动电路，包括：
    初始器，输出公共电压；
    补偿器，与所述初始器耦接；
    以及控制器,所述控制器采集所述初始器输出的公共电压，当所述公共电压小于预设阈值后，控制所述补偿器对所述公共电压的值进行补偿。
  3. 如权利要求2所述的一种驱动电路，其中，所述控制器包括：
    第一开关，与所述初始器控制连接，当所述控制器采集到的公共电压大于或等于预设阈值时，所述第一开关控制所述初始器正常工作；
    第二开关，与所述补偿器控制连接，当所述控制器采集到的公共电压小于所述预设阈值时，所述第二开关控制所述补偿器工作，对所述公共电压的值进行补偿。
  4. 如权利要求2所述的一种驱动电路，其中，所述控制器包括：
    标准电压电路，提供参考电压；
    第三开关，所述第三开关的源极与所述标准电压电路连接，所述第三开关的栅极与所述采集初始器输出的公共电压，所述漏极控制连接所述补偿器；当所述的公共电压小于所述参考电压时，所述第三开关控制所述补偿器对所述公共电压的值进行补偿。
  5. 如权利要求2所述的一种驱动电路，其中，所述控制器包括第四开关，所述第四开关与所述存储器和所述补偿器控制连接；
    当所述控制器采集到的公共电压大于或等于预设阈值时，所述第四开关控制所述初始器正常工作；
    当所述控制器采集到的公共电压小于所述预设阈值时，所述第二开关控制所述补偿器工作，对所述公共电压的值进行补偿。
  6. 如权利要求3所述的一种驱动电路，其中，所述控制器还包括：
    标准电压电路，提供参考电压；
    第三开关，控制连接所述第一开关和第二开关。
  7. 如权利要求6所述的一种驱动电路，其中，所述第三开关的源极与所述标准电压电路连接，所述第三开关的栅极与所述采集初始器输出的公共电压，所述第三开关的漏极控制连接所述第一开关和第二开关。
  8. 如权利要求4所述的一种驱动电路，其中，所述标准电压电路包括：串联在一高电平的供电电压和低电平电压之间的第一电阻和第二电阻，所述第三开关的源极连接到所述第一电阻和第二电阻之间；所述第一电阻和第二电阻中至少一个为可调电阻。
  9. 如权利要求2所述的一种驱动电路，其中，所述初始器包括初始存储器，所述初始存储器储存有公共电压的初始值；
    所述补偿器包括补偿存储器，所述补偿存储器存储有公共电压的补偿值；
    所述补偿存储器的输出端与所述初始存储器的输出端耦接，以对所述公共电压的初始值进行补偿。
  10. 如权利要求2所述的一种驱动电路，其中，所述初始器包括：
    初始存储器，储存初始信号编码；
    数字转模拟器，将所述初始存储器传送过来的所述初始信号编码转化成模拟电压；
    以及输出电流放大器，输出所述公共电压；
    所述初始存储器的输出端与所述数字转模拟器的输入端耦接，所述数字转模拟器的输出端与输出电流放大器的输入端耦接；所述输出电流放大器的输出端即为所述初始器的输出端；
    所述补偿器包括：
    补偿存储器，存储补偿信号编码；
    所述补偿存储器的输出端与所述初始器的数字转模拟器的输入端耦接。
  11. 如权利要求10所述的一种驱动电路，其中，所述标准电压电路包括第三电阻，所述第三电阻的一端与所述第三开关的漏极连接，一端接地。
  12. 如权利要求4所述的一种驱动电路，其中，所述驱动电路包括控制芯片，所述初始器、补偿器、第一开关和第二开关都设置在所述控制芯片上，所述标准电压电路、第三电阻和第三开关设置在所述控制芯片外。
  13. 一种显示装置，包括显示面板，所述显示面板包括：
    第一基板；
    第二基板，与所述第一基板相对设置；
    阵列层，形成于所述第一基板上；
    共电极，形成于所述第二基板上；
    以及驱动电路，包括：
    初始器，输出公共电压；
    补偿器，与所述初始器耦接；
    以及控制器,所述控制器采集所述初始器输出的公共电压，当所述公共电压小于预设阈值后，控制所述补偿器对所述公共电压的值进行补偿。
  14. 如权利要求13所述的一种显示装置，其中，所述控制器包括：
    第一开关，与所述初始器控制连接，当所述控制器采集到的公共电压大于或等于预设阈值时，所述第一开关控制所述初始器正常工作；
    第二开关，与所述补偿器控制连接，当所述控制器采集到的公共电压小于所述预设阈值时，所述第二开关控制所述补偿器工作，对所述公共电压的值进行补偿。
    标准电压电路，提供参考电压；
    以及第三开关，所述第三开关的源极与所述标准电压电路连接，所述第三开关的栅极与所述采集初始器输出的公共电压，所述漏极控制连接所述补偿器；当所述的公共电压小于所述参考电压时，所述第三开关控制所述补偿器对所述公共电压的值进行补偿。
  15. 如权利要求13所述的一种显示装置，其中，所述初始器包括：
    初始存储器，储存有对应的初始的公共电压的值的初始信号编码；
    数字转模拟器，将所述初始存储器传送过来的所述初始信号编码转化 成模拟电压；
    以及输出电流放大器，输出所述公共电压；
    所述初始存储器的输出端与所述数字转模拟器的输入端耦接，所述数字转模拟器的输出端与输出电流放大器的输入端耦接；所述输出电流放大器的输出端即为所述初始器的输出端；
    所述补偿器包括：
    补偿存储器，存储有公共电压的补偿信号编码；
    所述补偿存储器的输出端与所述初始器的数字转模拟器的输入端耦接。
  16. 如权利要求14所述的一种显示装置，其中，所述标准电压电路包括第三电阻，所述第三电阻的一端与所述第三开关的漏极连接，一端接地。
  17. 如权利要求16所述的一种显示装置，其中，所述驱动电路包括控制芯片，所述初始器、补偿器、第一开关和第二开关都设置在所述控制芯片上，所述标准电压电路、第三电阻和第三开关设置在所述控制芯片外。
  18. 如权利要求16所述的一种显示装置，其中，所述标准电压电路包括第一电阻和第二电阻，所述第一电阻的一端连接高电平的供电电压，所述第一电阻的另一端与所述第二电阻的一端连接，所述第二电阻的另一端接地，所述第三开关的源极连接到所述第一电阻和第二电阻之间；所述第一电阻和第二电阻之中至少一个为可调电阻。
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