WO2019090843A1 - 像素驱动架构及显示装置 - Google Patents

像素驱动架构及显示装置 Download PDF

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Publication number
WO2019090843A1
WO2019090843A1 PCT/CN2017/112607 CN2017112607W WO2019090843A1 WO 2019090843 A1 WO2019090843 A1 WO 2019090843A1 CN 2017112607 W CN2017112607 W CN 2017112607W WO 2019090843 A1 WO2019090843 A1 WO 2019090843A1
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WO
WIPO (PCT)
Prior art keywords
voltage
column data
data line
switch
pixel unit
Prior art date
Application number
PCT/CN2017/112607
Other languages
English (en)
French (fr)
Inventor
吴宇
王磊
Original Assignee
深圳市华星光电半导体显示技术有限公司
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Application filed by 深圳市华星光电半导体显示技术有限公司 filed Critical 深圳市华星光电半导体显示技术有限公司
Priority to US15/743,052 priority Critical patent/US10692435B2/en
Publication of WO2019090843A1 publication Critical patent/WO2019090843A1/zh

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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
    • G09G3/3614—Control of polarity reversal in general
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/136286—Wiring, e.g. gate line, drain line
    • 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
    • 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
    • G09G3/3685—Details of drivers for data electrodes
    • G09G3/3688—Details of drivers for data 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
    • 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
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0823—Several active elements per pixel in active matrix panels used to establish symmetry in driving, e.g. with polarity inversion
    • 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
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0248—Precharge or discharge of column electrodes before or after applying exact column voltages
    • 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
    • G09G2310/0278—Details of driving circuits arranged to drive both scan and data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G09G2330/023—Power management, e.g. power saving using energy recovery or conservation

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a pixel driving architecture and a display device.
  • the driving voltage applied to the liquid crystal molecules must be inverted at intervals to prevent permanent polarization of the liquid crystal material to cause polarization, and also to avoid image residual effects. Therefore, various polarity inversion methods have been proposed, including: frame inversion, line inversion, column inversion, and dot inversion.
  • the technical problem to be solved by the present invention is to provide a pixel driving architecture and a display device to reduce the voltage drop of the pixel unit to be driven by the driving circuit, thereby reducing the power consumption of the driving circuit and solving the problem under the heavy load screen.
  • the source driver temperature is too high.
  • a pixel driving architecture including:
  • a gate driver connected to the pixel unit through the scan line for providing the scan signal
  • a source driver connected to the pixel unit by the plurality of odd-numbered column data lines and the plurality of even-numbered column data lines for providing the data signals to form different driving polarities
  • timing controller connected to the gate driver and the source driver, for providing timing signals to the gate driver and the source driver
  • a switch is disposed between each odd-numbered column data line and an adjacent even-numbered column data line, the switch includes a control end, a first end, and a second end, and a control end of the switch is connected to the timing controller to pass the timing
  • the controller controls the switch to be turned on or off, the first end of the switch is connected to the odd column data line, and the second end of the switch is connected to the even column data line;
  • a pixel unit connected to the odd-numbered column data line is opposite in driving polarity to a pixel unit connected to the adjacent even-numbered column data line;
  • the switch is disposed at an end of the odd column data line and the adjacent even column data line away from the source driver.
  • a pixel drive architecture including:
  • a gate driver connected to the pixel unit through the scan line for outputting the scan signal
  • a source driver connected to the pixel unit by the plurality of odd-numbered column data lines and the plurality of even-numbered column data lines, for outputting the data signal to form a positive and negative driving polarity
  • timing controller connected to the gate driver and the source driver, for outputting timing signals to the gate driver and the source driver
  • a switch is disposed between each odd-numbered column data line and an adjacent even-numbered column data line, the switch includes a control end, a first end, and a second end, and a control end of the switch is connected to the timing controller to pass the timing
  • the controller controls the switch to be turned on or off, the first end of the switch is connected to the odd column data line, and the second end of the switch is connected to the even column data line.
  • a liquid crystal display device including a pixel driving architecture, the pixel driving architecture comprising:
  • a gate driver connected to the pixel unit through the scan line for outputting the scan signal
  • a source driver connected to the pixel unit by the plurality of odd-numbered column data lines and the plurality of even-numbered column data lines, for outputting the data signal to form a positive and negative driving polarity
  • timing controller connected to the gate driver and the source driver, for outputting timing signals to the gate driver and the source driver
  • a switch is disposed between each odd-numbered column data line and an adjacent even-numbered column data line, the switch includes a control end, a first end, and a second end, and a control end of the switch is connected to the timing controller to pass the timing
  • the controller controls the switch to be turned on or off, the first end of the switch is connected to the odd column data line, and the second end of the switch is connected to the even column data line.
  • the present invention controls the switch to be turned on or off by a timing controller by setting a switch between each odd-numbered column data line and an adjacent even-numbered column data line.
  • FIG. 1 is a schematic diagram of a conventional pixel driving architecture
  • FIG. 2 is a schematic diagram of the pixel light-dark switching voltage change of FIG. 1;
  • FIG. 3 is a schematic diagram of a pixel driving architecture of the present invention.
  • FIG. 4 is a schematic diagram of a pixel light-dark switching voltage change of FIG. 3;
  • Fig. 5 is a schematic structural view of a display device of the present invention.
  • FIG. 3 is a schematic diagram of a pixel driving architecture of the present invention.
  • the pixel driving architecture includes:
  • a scan line 20 for outputting a scan signal to the pixel unit 10;
  • a gate driver 40 connected to the pixel unit 10 through the scan line 20 for outputting the scan signal
  • the source driver 50 is connected to the pixel unit 10 through the plurality of odd-numbered column data lines 31 and the plurality of even-numbered data lines 32 for outputting the data signal to form a positive and negative driving polarity;
  • the timing controller 60 is connected to the gate driver 40 and the source driver 50 for outputting timing signals to the gate driver 40 and the source driver 50;
  • a switch 70 is disposed between each of the odd-numbered column data lines 31 and the adjacent even-numbered data lines 32.
  • the switch 70 includes a first end 71, a second end 72, and a control end 73.
  • the control end 73 of the switch 70 is connected to the switch end 73.
  • the timing controller 60 controls the switch 70 to be turned on or off by the timing controller 60.
  • the first end 71 of the switch 70 is connected to the odd column data line 31, and the second end 72 of the switch 70 is connected.
  • the pixel units 10 connected to the odd-numbered column data lines 31 are opposite in driving polarity to the pixel units 10 connected to the adjacent even-numbered column data lines 32.
  • the driving polarities on the odd column data line 31 and the even column data line 32 are opposite.
  • the odd column data line 31 drives the polarity to be positive
  • the even column data line 32 drives the polarity to be negative
  • the next frame the odd column data line 31 drives the polarity to be negative
  • the even column data line 32 drives the polarity to be negative
  • the even column data line 32 drives the polarity to be negative
  • the even column data line 32 drives the polarity to be negative
  • the even column data line 32 drives the polarity to be negative
  • the even column data line 32 drives the polarity to be negative
  • the even column data line 32 drives the polarity to be negative
  • the even column data line 32 drives the polarity to be negative
  • the even column data line 32 drives the polarity to be negative
  • the even column data line 32 drives the polarity to be negative
  • the even column data line 32 drives the polarity to be negative
  • the even column data line 32 drives the polarity to be negative
  • the switch 70 can also be disposed at other locations as long as the switch 70 is connected between an odd-numbered column data line 31 and an even-numbered column data line 32 adjacent to the odd-numbered column data line 31. It is not limited to the positional relationship of the switch 70 described in this embodiment.
  • the timing controller 60 outputs a first control signal to the control terminal 73 of the switch 70 to control the switch 70 to be turned on, that is, the first of the switch 70
  • the terminal 71 is connected to the second terminal 72 through the control terminal 73.
  • the voltage on the odd column data line 31 is changed from the first voltage V1 to the fourth voltage V4, and the voltage on the even column data line 32 is from the second voltage V2.
  • the change is the fifth voltage V5, after which the timing controller 60 outputs a second control signal to the control terminal 73 of the switch 70 to control the switch 70 to be turned off, that is, the first end 71 of the switch 70 is controlled.
  • the end 73 is disconnected from the second end 72.
  • the source driver 50 charges the next row of scan lines 20 and the pixel cells 10 connected to the second row of scan lines S2, the voltage on the odd column data lines 31 is from The fourth voltage V4 is changed to a third voltage V3, the even column data
  • the voltage on 32 changes from the fifth voltage V5 to the third voltage V3, and the source driver 50 gives the next two rows of scan lines, such as the third row of scan lines, before the connected pixel unit 10 is charged, the timing controller 60 Outputting a first control signal to the control terminal 73 of the switch 70 to control the switch 70 to be turned on, the voltage on the odd column data line 31 is changed from the third voltage V3 to the fourth voltage V4, the even column data
  • the voltage on line 32 changes from a third voltage V3 to a fifth voltage V5, after which timing controller 60 outputs a second control signal to control terminal 73 of said switch 70 to control said switch 70 to open, said source The pole driver 50 gives the next two lines of scan lines, When the pixel unit 10 connected to the third row scanning line S3 is charged, the voltage on
  • the absolute value of the difference between the first voltage V1 and the third voltage V3 is the same as the absolute value of the difference between the second voltage V2 and the third voltage V3, and the fourth voltage V4 and the The absolute value of the difference of the third voltage V3 is the same as the absolute value of the difference between the fifth voltage V5 and the third voltage V3, the first voltage V1 is greater than the fourth voltage V4, the fourth voltage V4 is greater than the third voltage V3.
  • FIG. 2 is a schematic diagram of pixel light-dark switching voltage variation in the existing pixel driving architecture. among them,
  • V1 the first voltage, the charging voltage of the odd-numbered column data lines, the charging completion pixel unit is in a bright state, and the voltage is V1;
  • V2 the second voltage, the charging voltage of the even-numbered data lines, the charging completion pixel unit is in a bright state, and the voltage is V2;
  • V3 the third voltage, the voltage of the pixel unit in the dark state
  • the voltage of the pixel unit connected to the source driver driving the odd-numbered column data lines is changed from V1 to V3.
  • the voltage of the pixel unit connected to the source driver driving the even-numbered column data lines is changed from V2 to V3;
  • the voltage of the pixel unit connected to the source driver driving the odd-numbered column data lines is changed from V3 to V1.
  • the voltage of the pixel unit connected to the source driver driving the even-numbered column data lines is changed from V3 to V2.
  • the existing pixel driving architecture needs to perform pixel unit light-dark voltage switching when the pixel unit has a bright-and-dark interval of the pixel unit, and the driving circuit directly applies the voltage of the odd-numbered column data line. From V1 to V3, the voltage on the even-numbered data line rises from V2 to V3, the voltage difference is large, the output power of the source driver becomes larger, and the heat becomes larger. If the heat dissipation measures are not good, the temperature will rise slowly. Thereby affecting product quality and reliability.
  • FIG. 4 is a schematic diagram of pixel light-dark switching voltage variation under the pixel driving architecture of the present invention.
  • the pixel unit 10 changes from a bright state to a transition state.
  • the switch 70 disposed between the data lines 30 is controlled by the timing controller 60 to be turned on, that is, the first end 71 of the switch 70 is connected to the second end 72 through the control terminal 73, the first voltage V1 and the second voltage. V2 neutralized,
  • the odd-numbered column data line 31 is changed from the first voltage V1 to the transition state fourth voltage V4, and the corresponding connected pixel unit 10 is charged to the fourth voltage V4;
  • the even-numbered data line 32 is The second voltage V2 becomes the transition state fifth voltage V5, and the corresponding connected pixel unit 10 is charged to the fifth voltage V5;
  • the switch 70 disposed between the disconnected data lines 30 is controlled by the timing controller 60, that is, the first end 71 of the switch 70 is disconnected from the second end 72 by the control terminal 73.
  • the pixel unit 10 changes from a transition state to a dark state
  • the voltage of the pixel unit 10 to which the source driver 50 drives the odd column data line 31 is changed from the fourth voltage V4 to the third voltage V3.
  • the voltage of the pixel unit 10 connected to the source driver 50 driving the even column data line 32 is changed from the fifth voltage V5 to the third voltage V3;
  • the switch 70 disposed between the data lines 30 is controlled to be turned on by the timing controller 60, and the first voltage V1 and the second voltage V2 are neutralized,
  • the odd column data line 31 is changed from the third voltage V3 to the fourth voltage V4, the corresponding connected pixel unit 10 is charged to the fourth voltage V4, and the even column data line 32 is changed by the third voltage V3.
  • the fifth voltage V5 charging the corresponding connected pixel unit 10 to the fifth voltage V5;
  • the voltage of the pixel unit 10 to which the source driver 50 drives the odd-numbered column data lines 31 is changed from the fourth voltage V4 to the first voltage V1,
  • the voltage of the pixel unit 10 to which the source driver 50 drives the even-numbered column data lines 32 is changed from the fifth voltage V5 to the second voltage V2.
  • the pixel driving architecture of the present invention needs to perform the light-dark voltage switching of the pixel unit 10 when the pixel unit 10 has a light-and-dark interval of the pixel unit 10, and the driving circuit sets the odd-numbered data line 31.
  • the voltage on the voltage drops from V1 to V4, and then from V4 to V3.
  • the voltage on the even-numbered data line 32 rises from V2 to V5, and then rises from V5 to V3, so that the change in the differential pressure is small by the intermediate value.
  • the voltage drop of the pixel unit 10 to be driven by the driving circuit is reduced, thereby reducing the power consumption of the driving circuit, and solving the problem that the temperature of the source driver 50 is too high under the heavy-load screen, thereby improving product quality reliability.
  • FIG. 5 is a schematic structural view of a display device of the present invention.
  • the display device 2 includes the pixel driving structure 1.
  • the display device 2 may be an LCD or an OLED.
  • Other devices and functions of the display device 2 are the same as those of the existing display device, and details are not described herein. .
  • the invention sets a switch between adjacent data lines, controls the switch to be turned on or off through a timing controller, and obtains a transition state voltage by voltage neutralization, so that an intermediate transition state is generated when the pixel unit is switched between light and dark, and then the source is
  • the driver drives the data line voltage change to achieve the pixel unit from the transition state to the bright/dark state.
  • the present invention can reduce the voltage drop of the pixel light-dark switching that the source driver needs to drive, thereby reducing the power consumption of the driving circuit and solving the problem that the source driver temperature is too high under the heavy-load screen.

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Abstract

一种像素驱动架构包括：像素单元（10）；扫描线（20），输出扫描信号；若干奇数列数据线（31）及若干偶数列数据线（32），输出数据信号；栅极驱动器（40），提供扫描信号；源极驱动器（50），提供数据信号；时序控制器（60），提供时序信号；在相邻数据线之间设置开关（70），通过时序控制器控制开关导通或断开。

Description

像素驱动架构及显示装置
【技术领域】
本发明涉及显示技术领域，特别是涉及一种像素驱动架构及显示装置。
【背景技术】
液晶显示装置中，施加在液晶分子的驱动电压必须每隔一段时间进行反转，用以避免液晶材料产生极化而造成永久性的破坏，也用以避免图像残存效应。因此，提出了各种极性反转方法，包括有：帧反转、行反转、列反转和点反转。
如图1及图2所示，在列反转的方法中，出现像素单元亮暗（H/L）间隔的重载画面时，数据线需要做像素单元亮暗电压切换，驱动电路需要把奇数列数据线上的电压从V1降到V3，偶数列数据线上的电压从V2升到V3，压差较大，源极驱动器的输出功耗变大，发热变大；若是散热措施不好，温度会缓慢升高，从而影响产品质量可靠性。
【发明内容】
本发明主要解决的技术问题是提供一种像素驱动架构及显示装置，以减小驱动电路需要驱动的像素单元亮暗切换的压降，从而减小驱动电路的功耗，解决在重载画面下源极驱动器温度过高的问题。
为解决上述技术问题，本发明采用的一个技术方案是：
一种像素驱动架构，其中，包括：
像素单元；
扫描线，用于输出扫描信号给所述像素单元；
若干奇数列数据线及若干偶数列数据线，用于输出数据信号给所述像素单元；
栅极驱动器，通过所述扫描线与所述像素单元连接，用于提供所述扫描信号；
源极驱动器，通过所述若干奇数列数据线及所述若干偶数列数据线与所述像素单元连接，用于提供所述数据信号，形成不同驱动极性；
时序控制器，连接所述栅极驱动器及所述源极驱动器，用于提供时序信号给所述栅极驱动器及所述源极驱动器；及
每一奇数列数据线与相邻偶数列数据线之间设置开关，所述开关包括控制端、第一端及第二端，所述开关的控制端连接所述时序控制器以通过所述时序控制器控制所述开关导通或断开，所述开关的第一端连接奇数列数据线，所述开关的第二端连接偶数列数据线；
所述奇数列数据线上连接的像素单元与相邻所述偶数列数据线上连接的像素单元的驱动极性相反；
所述开关设置在所述奇数列数据线与相邻所述偶数列数据线的远离所述源极驱动器的一端。
为解决上述技术问题，本发明采用的另一个技术方案是：
提供一种像素驱动架构，包括：
像素单元；
扫描线，用于输出扫描信号给所述像素单元；
若干奇数列数据线及若干偶数列数据线，用于输出数据信号给所述像素单元；
栅极驱动器，通过所述扫描线与所述像素单元连接，用于输出所述扫描信号；
源极驱动器，通过所述若干奇数列数据线及所述若干偶数列数据线与所述像素单元连接，用于输出所述数据信号，形成正负驱动极性；
时序控制器，连接栅极驱动器及源极驱动器，用于输出时序信号给所述栅极驱动器及所述源极驱动器；及
每一奇数列数据线与相邻偶数列数据线之间设置开关，所述开关包括控制端、第一端及第二端，所述开关的控制端连接所述时序控制器以通过所述时序控制器控制所述开关导通或断开，所述开关的第一端连接奇数列数据线，所述开关的第二端连接偶数列数据线。
为解决上述技术问题，本发明采用的再一个技术方案是：
提供一种液晶显示装置，包括像素驱动架构，所述像素驱动架构包括：
像素单元；
扫描线，用于输出扫描信号给所述像素单元；
若干奇数列数据线及若干偶数列数据线，用于输出数据信号给所述像素单元；
栅极驱动器，通过所述扫描线与所述像素单元连接，用于输出所述扫描信号；
源极驱动器，通过所述若干奇数列数据线及所述若干偶数列数据线与所述像素单元连接，用于输出所述数据信号，形成正负驱动极性；
时序控制器，连接栅极驱动器及源极驱动器，用于输出时序信号给所述栅极驱动器及所述源极驱动器；及
每一奇数列数据线与相邻偶数列数据线之间设置开关，所述开关包括控制端、第一端及第二端，所述开关的控制端连接所述时序控制器以通过所述时序控制器控制所述开关导通或断开，所述开关的第一端连接奇数列数据线，所述开关的第二端连接偶数列数据线。
本发明的有益效果是：区别于现有技术的情况，本发明通过在每一奇数列数据线与相邻偶数列数据线之间设置开关，通过时序控制器控制开关的导通或断开，以减小源极驱动器需要驱动的像素亮暗切换的压降，从而减小驱动电路的功耗，解决在重载画面下源极驱动器温度过高的问题。
【附图说明】
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据提供的附图获得其他的附图。
图1是现有的像素驱动架构的示意图；
图2是图1的像素亮暗切换电压变化示意图；
图3是本发明像素驱动架构的示意图；
图4是图3的像素亮暗切换电压变化示意图；
图5是本发明显示装置的结构示意图。
【具体实施方式】
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
下面结合附图和实施例对本发明进行详细的说明。
请参阅图3，是本发明像素驱动架构的示意图。所述像素驱动架构，包括：
像素单元10；
扫描线20，用于输出扫描信号给所述像素单元10；
若干奇数列数据线31及若干偶数列数据线32，用于输出数据信号给所述像素单元10；
栅极驱动器40，通过所述扫描线20与所述像素单元10连接，用于输出所述扫描信号；
源极驱动器50，通过所述若干奇数列数据线31及所述若干偶数列数据线32与所述像素单元10连接，用于输出所述数据信号，形成正负驱动极性；
时序控制器60，连接所述栅极驱动器40及所述源极驱动器50，用于输出时序信号给所述栅极驱动器40及所述源极驱动器50；及
每一奇数列数据线31与相邻偶数列数据线32之间设置开关70，所述开关70包括第一端71、第二端72及控制端73，所述开关70的控制端73连接所述时序控制器60以通过所述时序控制器60控制所述开关70导通或断开，所述开关70的第一端71连接奇数列数据线31，所述开关70的第二端72连接偶数列数据线32；
具体地，所述奇数列数据线31上连接的像素单元10与相邻所述偶数列数据线32上连接的像素单元10的驱动极性相反。
在列反转的方法中，奇数列数据线31和偶数列数据线32上的驱动极性相反。例如，在一帧中，奇数列数据线31驱动极性为正，偶数列数据线32驱动极性为负，下一帧，奇数列数据线31驱动极性切换为负，偶数列数据线32驱动极性切换为正电压，相邻数据线30驱动极性都互相互反。在本实施例中，所述开关70设置在所述奇数列数据线31与相邻所述偶数列数据线32的远离所述源极驱动器50的一端。在其他实施例中，所述开关70也可设置在其他位置，只要所述开关70连接在一奇数列数据线31与所述奇数列数据线31相邻的偶数列数据线32之间即可，其并不限定于本实施例中所述开关70的位置关系。
所述像素驱动架构的工作原理描述如下：在所述源极驱动器50给当前行扫描线20，如第一行扫描线S1，连接的像素单元10充电完成且下一行扫描线20，第二行扫描线S2，连接的像素单元10充电前，所述时序控制器60输出第一控制信号给所述开关70的控制端73，以控制所述开关70导通，即所述开关70的第一端71通过控制端73与第二端72连接，所述奇数列数据线31上的电压从第一电压V1变化为第四电压V4，所述偶数列数据线32上的电压从第二电压V2变化为第五电压V5，之后所述时序控制器60输出第二控制信号给所述开关70的控制端73，以控制所述开关70断开，即所述开关70的第一端71通过控制端73与第二端72断开，所述源极驱动器50给所述下一行扫描线20，第二行扫描线S2连接的像素单元10充电时，所述奇数列数据线31上的电压从第四电压V4变化为第三电压V3，所述偶数列数据线32上的电压从第五电压V5变化为第三电压V3，所述源极驱动器50给下两行扫描线，如第三行扫描线，连接的像素单元10充电前，所述时序控制器60输出第一控制信号给所述开关70的控制端73以控制所述开关70导通，所述奇数列数据线31上的电压从第三电压V3变化为第四电压V4，所述偶数列数据线32上的电压从第三电压V3变化为第五电压V5，之后所述时序控制器60输出第二控制信号给所述开关70的控制端73以控制所述开关70断开，所述源极驱动器50给所述下两行扫描线, 第三行扫描线S3连接的像素单元10充电时，所述奇数列数据线31上的电压从第四电压V4变换为第一电压V1，所述偶数列数据线32上的电压从第五电压V5变化为第三电压V3。
具体地，所述第一电压V1和所述第三电压V3差值的绝对值与所述第二电压V2与所述第三电压V3差值的绝对值相同，所述第四电压V4和所述第三电压V3差值的绝对值与所述第五电压V5和所述第三电压V3差值的绝对值相同，所述第一电压V1大于所述第四电压V4，所述第四电压V4大于所述第三电压V3。
请参阅图2，是现有像素驱动架构下像素亮暗切换电压变化示意图。其中，
V1：第一电压，奇数列数据线的充电电压，充电完成像素单元为亮态，电压为V1；
V2：第二电压，偶数列数据线的充电电压，充电完成像素单元为亮态，电压为V2；
V3：第三电压，像素单元暗态下电压；
从图2中可以看出，从曲线a到c：像素单元由亮态变为暗态，
源极驱动器驱动奇数列数据线连接的像素单元的电压由V1变为V3，
源极驱动器驱动偶数列数据线连接的像素单元的电压由V2变为V3；
从曲线c到d：像素单元充电完成，电压保持在第三电压V3并持续一段时间；
从曲线d到f：像素单元由暗态变为亮态，
源极驱动器驱动奇数列数据线连接的像素单元的电压由V3变为V1，
源极驱动器驱动偶数列数据线连接的像素单元的电压由V3变为V2。
因此从图2中可以看出，现有的像素驱动架构在出现像素单元亮暗间隔的重载画面时，数据线需要做像素单元亮暗电压切换，驱动电路直接把奇数列数据线上的电压从V1降到V3，偶数列数据线上的电压从V2升到V3，压差较大，源极驱动器的输出功耗变大，发热变大，若是散热措施不好，温度会缓慢升高，从而影响产品质量可靠性。
请参阅图4，是本发明像素驱动架构下像素亮暗切换电压变化示意图。
其中，从图4中可以看出，从曲线a到b：像素单元10由亮态变为过渡态，
通过时序控制器60控制数据线30间设置的开关70导通，即所述开关70的第一端71通过控制端73与第二端72连接，所述第一电压V1和所述第二电压V2中和，
开关70导通瞬间，奇数列数据线31由所述第一电压V1变为过渡态第四电压V4，给相应连接的像素单元10充电至所述第四电压V4；偶数列数据线32由所述第二电压V2变为过渡态第五电压V5，给相应连接的像素单元10充电至所述第五电压V5；
再通过时序控制器60控制断开数据线30间设置的开关70，即所述开关70的第一端71通过控制端73与第二端72断开，
从曲线b到c：像素单元10由过渡态变为暗态，
源极驱动器50驱动奇数列数据线31连接的像素单元10的电压由所述第四电压V4变为所述第三电压V3，
源极驱动器50驱动偶数列数据线32连接的像素单元10的电压由所述第五电压V5变为所述第三电压V3；
从曲线d到e：像素单元10由暗态变为过渡态，
通过时序控制器60控制数据线30间设置的开关70导通，所述第一电压V1和所述第二电压V2中和，
奇数列数据线31由所述第三电压V3变为所述第四电压V4，给相应连接的像素单元10充电至所述第四电压V4，偶数列数据线32由所述第三电压V3变为所述第五电压V5，给对应连接的像素单元10充电至所述第五电压V5；
再通过所述时序控制器60控制断开数据线30间设置的开关70，
从曲线e到f：像素单元10由过渡态变为亮态，
源极驱动器50驱动奇数列数据线31连接的像素单元10的电压由所述第四电压V4变为所述第一电压V1，
源极驱动器50驱动偶数列数据线32连接的像素单元10的电压由所述第五电压V5变为所述第二电压V2。
因此从图4中可以看出，本发明的像素驱动架构在出现像素单元10亮暗间隔的重载画面时，数据线30需要做像素单元10亮暗电压切换，驱动电路把奇数列数据线31上的电压从V1降到V4，然后再从V4降到V3，偶数列数据线32上的电压从V2升到V5，然后再从V5升到V3，这样通过中间值使得压差变化小，以减小驱动电路需要驱动的像素单元10亮暗切换的压降，从而减小驱动电路的功耗，解决在重载画面下源极驱动器50温度过高的问题，进而提升了产品质量可靠性。
请参阅图5，是本发明显示装置的结构示意图。所述显示装置2包括所述像素驱动架构1，所述显示装置2可以为LCD或OLED，所述显示装置2的其他器件及功能与现有显示装置的器件及功能相同，在此不再赘述。
本发明通过在相邻数据线之间设置开关，通过时序控制器控制开关导通或断开，由电压中和得到过渡态电压，使得像素单元亮暗切换时产生中间过渡态，再由源极驱动器驱动数据线电压变化，实现像素单元由过渡态到亮/暗态。通过上述方式本发明能够减小源极驱动器需要驱动的像素亮暗切换的压降，从而减小驱动电路的功耗，解决在重载画面下源极驱动器温度过高的问题。
以上所述仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (11)

  1. 一种像素驱动架构，其中，包括：
    像素单元；
    扫描线，用于输出扫描信号给所述像素单元；
    若干奇数列数据线及若干偶数列数据线，用于输出数据信号给所述像素单元；
    栅极驱动器，通过所述扫描线与所述像素单元连接，用于提供所述扫描信号；
    源极驱动器，通过所述若干奇数列数据线及所述若干偶数列数据线与所述像素单元连接，用于提供所述数据信号，形成不同驱动极性；
    时序控制器，连接所述栅极驱动器及所述源极驱动器，用于提供时序信号给所述栅极驱动器及所述源极驱动器；及
    每一奇数列数据线与相邻偶数列数据线之间设置开关，所述开关包括控制端、第一端及第二端，所述开关的控制端连接所述时序控制器以通过所述时序控制器控制所述开关导通或断开，所述开关的第一端连接奇数列数据线，所述开关的第二端连接偶数列数据线；
    所述奇数列数据线上连接的像素单元与相邻所述偶数列数据线上连接的像素单元的驱动极性相反；
    所述开关设置在所述奇数列数据线与相邻所述偶数列数据线的远离所述源极驱动器的一端。
  2. 一种像素驱动架构，其中，包括：
    像素单元；
    扫描线，用于输出扫描信号给所述像素单元；
    若干奇数列数据线及若干偶数列数据线，用于输出数据信号给所述像素单元；
    栅极驱动器，通过所述扫描线与所述像素单元连接，用于提供所述扫描信号；
    源极驱动器，通过所述若干奇数列数据线及所述若干偶数列数据线与所述像素单元连接，用于提供所述数据信号，形成不同驱动极性；
    时序控制器，连接所述栅极驱动器及所述源极驱动器，用于提供时序信号给所述栅极驱动器及所述源极驱动器；及
    每一奇数列数据线与相邻偶数列数据线之间设置开关，所述开关包括控制端、第一端及第二端，所述开关的控制端连接所述时序控制器以通过所述时序控制器控制所述开关导通或断开，所述开关的第一端连接奇数列数据线，所述开关的第二端连接偶数列数据线。
  3. 根据权利要求2所述像素驱动架构，其中，所述奇数列数据线上连接的像素单元与相邻所述偶数列数据线上连接的像素单元的驱动极性相反。
  4. 根据权利要求2所述像素驱动架构，其中，所述开关设置在所述奇数列数据线与相邻所述偶数列数据线的远离所述源极驱动器的一端。
  5. 根据权利要求2所述像素驱动架构，其中，
    在所述源极驱动器给当前行扫描线连接的像素单元充电完成且下一行扫描线连接的像素单元充电前，所述时序控制器控制所述连接开关导通，所述奇数列数据线上的电压从第一电压变化为第四电压，所述偶数列数据线上的电压从第二电压变化为第五电压，之后所述时序控制器控制所述连接开关断开，所述源极驱动器给所述下一行扫描线连接的像素单元充电时，所述奇数列数据线上的电压从第四电压变化为第三电压，所述偶数列数据线上的电压从第五电压变化为第三电压，所述源极驱动器给下两行扫描线连接的像素单元充电前，所述时序控制器控制所述开关导通，所述奇数列数据线上的电压从第三电压变化为第四电压，所述偶数列数据线上的电压从第三电压变化为第五电压，之后所述时序控制器控制所述开关断开，所述源极驱动器给所述下两行扫描线连接的像素单元充电时，所述奇数列数据线上的电压从第四电压变换为第一电压，所述偶数列数据线上的电压从第五电压变化为第三电压。
  6. 根据权利要求5所述像素驱动架构，其中，所述奇数列数据线上的电压变化相同，所述偶数列数据线上的电压变化相同，所述第一电压和所述第三电压差值的绝对值与所述第二电压与所述第三电压差值的绝对值相同，所述第四电压和所述第三电压差值的绝对值与所述第五电压和所述第三电压差值的绝对值相同，所述第一电压大于所述第四电压，所述第四电压大于所述第三电压。
  7. 一种显示装置，其中，所述显示装置包括像素驱动架构：
    像素单元；
    扫描线，用于输出扫描信号给所述像素单元；
    若干奇数列数据线及若干偶数列数据线，用于输出数据信号给所述像素单元；
    栅极驱动器，通过所述扫描线与所述像素单元连接，用于输出所述扫描信号；
    源极驱动器，通过所述若干奇数列数据线及所述若干偶数列数据线与所述像素单元连接，用于输出所述数据信号，形成不同驱动极性；
    时序控制器，连接所述栅极驱动器及所述源极驱动器，用于输出时序信号给所述栅极驱动器及所述源极驱动器；及
    每一奇数列数据线与相邻偶数列数据线之间设置开关，所述开关包括控制端、第一端及第二端，所述开关的控制端连接所述时序控制器以通过所述时序控制器控制所述开关导通或断开，所述开关的第一端连接奇数列数据线，所述开关的第二端连接偶数列数据线。
  8. 根据权利要求7所述显示装置，其中，所述奇数列数据线上连接的像素单元与相邻所述偶数列数据线上连接的像素单元驱动极性相反。
  9. 根据权利要求7所述显示装置，其中，所述开关设置在所述奇数列数据线与相邻所述偶数列数据线的远离所述源极驱动器的一端。
  10. 根据权利要求7所述显示装置，其中，
    在所述源极驱动器给当前行扫描线连接的像素单元充电完成且下一行扫描线连接的像素单元充电前，所述时序控制器控制所述连接开关导通，所述奇数列数据线上的电压从第一电压变化为第四电压，所述偶数列数据线上的电压从第二电压变化为第五电压，之后所述时序控制器控制所述连接开关断开，所述源极驱动器给所述下一行扫描线连接的像素单元充电时，所述奇数列数据线上的电压从第四电压变化为第三电压，所述偶数列数据线上的电压从第五电压变化为第三电压，所述源极驱动器给下两行扫描线连接的像素单元充电前，所述时序控制器控制所述开关导通，所述奇数列数据线上的电压从第三电压变化为第四电压，所述偶数列数据线上的电压从第三电压变化为第五电压，之后所述时序控制器控制所述开关断开，所述源极驱动器给所述下两行扫描线连接的像素单元充电时，所述奇数列数据线上的电压从第四电压变换为第一电压，所述偶数列数据线上的电压从第五电压变化为第三电压。
  11. 根据权利要求10所述显示装置，其中，所述第一电压和所述第三电压差值的绝对值与所述第二电压与所述第三电压差值的绝对值相同，所述第四电压和所述第三电压差值的绝对值与所述第五电压和所述第三电压差值的绝对值相同，所述第一电压大于所述第四电压，所述第四电压大于所述第三电压。
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