WO2017092137A1 - 液晶显示面板的驱动方法及液晶显示面板 - Google Patents

液晶显示面板的驱动方法及液晶显示面板 Download PDF

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Publication number
WO2017092137A1
WO2017092137A1 PCT/CN2015/099655 CN2015099655W WO2017092137A1 WO 2017092137 A1 WO2017092137 A1 WO 2017092137A1 CN 2015099655 W CN2015099655 W CN 2015099655W WO 2017092137 A1 WO2017092137 A1 WO 2017092137A1
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Prior art keywords
liquid crystal
crystal display
display panel
pixel
scan
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PCT/CN2015/099655
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English (en)
French (fr)
Inventor
郝思坤
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深圳市华星光电技术有限公司
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Priority to US14/905,969 priority Critical patent/US20170162143A1/en
Publication of WO2017092137A1 publication Critical patent/WO2017092137A1/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
    • 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
    • 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
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • 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
    • 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
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • 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
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133742—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for homeotropic alignment
    • 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
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/0426—Layout of electrodes and connections
    • 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
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0465—Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
    • 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
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • 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
    • G09G2320/028—Improving the quality of display appearance by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/066—Adjustment of display parameters for control of contrast
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
    • G09G2340/0435—Change or adaptation of the frame rate of the video stream
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/10—Mixing of images, i.e. displayed pixel being the result of an operation, e.g. adding, on the corresponding input pixels

Definitions

  • the present invention relates to the field of liquid crystal displays, and more particularly to a liquid crystal display panel driving method and a liquid crystal display panel driven by the method.
  • LCD Liquid crystal display Display
  • Thin Film compared to cathode ray tube display Transistor (TFT-LCD)
  • TFT-LCD cathode ray tube display Transistor
  • VA-LCD Vertical Alignment Liquid Crystal Display
  • a common countermeasure against color shift under such a large viewing angle is to use a spatial method, that is, to divide the ITO region of a pixel unit into a plurality of domains, and design a plurality of TFTs. The way to make the brightness between different domains different, to achieve the effect of low color shift at large viewing angles.
  • Figure 1 shows three TFTs in the prior art.
  • the equivalent circuit diagram of the pixel unit When Gn outputs a high level, the liquid crystal capacitor Clc-A, the storage capacitor Cst-A, the charge sharing capacitors Ccs-A, and Ccs-B of the A region are charged and discharged through the TFT1, and the liquid crystal capacitor Clc-B and the memory are transferred to the B region through the TFT2.
  • the capacitor Cst-B is charged and discharged, and finally reaches substantially the same pixel voltages VpA and VpB.
  • TFT1 and TFT2 are turned off, Gn+1 outputs a high level, TFT3 is turned on, and the voltage is shared by the charge sharing capacitors Ccs-A and Ccs-B.
  • the voltage formed at node C is the last of the B region.
  • Pixel voltage VpB Due to the difference in voltage between the pixel voltage VpA and the pixel voltage VpB, the luminances between different domains are different, so that the effect of low color shift at a large viewing angle is achieved.
  • the technical problem to be solved by the present invention is to provide a driving method of a liquid crystal display panel and a liquid crystal display panel, which can improve shortcomings such as large viewing angle contrast and color shift of a vertically oriented liquid crystal display, and have a wider viewing angle.
  • the present invention provides a driving method of a liquid crystal display panel, comprising the steps of: displaying one picture using two frames of images, and driving two frames of images with different driving voltages to make liquid crystal molecules of corresponding pixel units There are two orientations; the brightness and chromaticity of the two frames of image are superimposed as the display image of the picture.
  • the two frames of image are driven using drive voltages of the same polarity and different sizes.
  • the two frames of image are driven using drive voltages of different polarities and sizes.
  • the present invention further provides a liquid crystal display panel, comprising: a plurality of pixel units, each pixel unit comprising: a data line for transmitting a data signal; a scan line for transmitting a scan signal; and a switch connected to the Between the data line and a pixel electrode, the switch receives a scan signal of the scan line, and the switch includes a source, a drain, and a gate, and the data line is electrically connected to the source.
  • the scan line is electrically connected to the gate, the pixel electrode is electrically connected to the drain; a storage capacitor is connected between the pixel electrode and the common electrode; and a liquid crystal capacitor is connected at one end thereof In the pixel electrode, the other end of the liquid crystal capacitor is connected to a common electrode; if the switch receives an on signal from the scan line and is turned on, the data signal on the data line is transmitted via the switch To the storage capacitor, the storage capacitor is stored to the corresponding potential according to the charging of the data signal, and the pixel electrode has a corresponding potential.
  • the liquid crystal display panel further includes an image display area, and the image display area includes a pixel area formed by interlacing a plurality of the data lines and the plurality of scan lines, each of the pixel units Set in the pixel area.
  • the liquid crystal display panel further includes a source driver and a gate driver, and the source driver transmits the provided data signal to the image display area through a plurality of the data lines coupled thereto.
  • the gate driver transmits the supplied scan signal to the image display area through a plurality of the scan lines coupled thereto.
  • the present invention further provides a liquid crystal display panel comprising a plurality of pixel units, each pixel unit comprising: a data line for transmitting a data signal; a scan line for transmitting a scan signal; and a switch connected to the Between the data line and a pixel electrode, the switch receives the scan signal of the scan line to be turned on; a storage capacitor connected between the pixel electrode and the common electrode; and a liquid crystal capacitor connected at one end thereof The pixel electrode; if the switch receives an on signal from the scan line and turns on, the data signal on the data line is transmitted to the storage capacitor via the switch, and the storage capacitor is stored according to the data signal charging The corresponding potential, then the pixel electrode has a corresponding potential.
  • the switch includes a source, a drain, and a gate, the data line is electrically connected to the source, the scan line is electrically connected to the gate, and the pixel electrode is The drain is electrically connected.
  • the other end of the liquid crystal capacitor is connected to a common electrode.
  • the liquid crystal display panel further includes an image display area, and the image display area includes a pixel area formed by interlacing a plurality of the data lines and the plurality of scan lines, each of the pixel units Set in the pixel area.
  • the liquid crystal display panel further includes a source driver and a gate driver, and the source driver transmits the provided data signal to the image display area through a plurality of the data lines coupled thereto.
  • the gate driver transmits the supplied scan signal to the image display area through a plurality of the scan lines coupled thereto.
  • the invention has the advantages that the image is superimposed and displayed by using two frames of different driving voltages, so that the liquid crystal molecules of the corresponding pixels have two orientations at different times, which improves the contrast of the large viewing angle of the vertical alignment liquid crystal display and the color shift. To make it more widely available.
  • the liquid crystal display panel of the present invention requires only one TFT switch, and the aperture ratio and transmittance of the pixel are improved by at least 20%.
  • FIG. 1 is an equivalent circuit diagram of a pixel unit having three TFTs of a vertical alignment type liquid crystal display of the prior art
  • FIG. 2 is a schematic view showing a driving method of a vertical alignment type liquid crystal display of the prior art
  • FIG. 3 is a schematic view showing the liquid crystal orientation of a vertical alignment type liquid crystal display of the prior art
  • FIG. 4 is a schematic view showing the liquid crystal orientation of a vertical alignment type liquid crystal display driven by the driving method of the present invention
  • Figure 6 is a schematic illustration of one embodiment of a driving method of the present invention.
  • Figure 7 is a schematic view of another embodiment of the driving method of the present invention.
  • FIG. 8 is a schematic structural view of a vertical alignment type liquid crystal display panel of the present invention.
  • Figure 9 is a schematic view showing the structure of a pixel of the present invention.
  • Fig. 10 is an equivalent circuit diagram of a pixel unit.
  • the conventional vertical alignment type liquid crystal display adopts a voltage driving on one picture, and each picture ( Figure) is displayed by one frame.
  • the image n is used to represent the nth picture.
  • the frame n is used to represent the nth frame, and each frame has a plurality of pixels (Pixel), one of which is represented by a pixel M.
  • Matel pixels
  • Existing vertical alignment type liquid crystal displays employ a voltage drive such that liquid crystal molecules of each pixel have only one orientation. Referring to Figure 3, all liquid crystal molecules have the same orientation off angle ⁇ .
  • the present invention provides a driving method of a liquid crystal display panel, comprising the following steps:
  • a picture is displayed using two frames of images, and two frames of images are driven using different driving voltages so that the liquid crystal molecules of the corresponding pixel unit have two orientations.
  • a picture is driven with two driving voltages such that the liquid crystal molecules of each pixel have two orientation declination angles ⁇ and ⁇ at different times.
  • frame 2n and frame 2n+1 are both used to display image n.
  • frame 2n and frame 2n+1 are superimposed for displaying image n. From the time average effect, each picture is viewed.
  • the liquid crystal molecules in the pixels have two orientations at different times, and the viewing angle is wider.
  • frame 2n and frame 2n+1 are driven by driving voltages of the same polarity and different sizes.
  • frame 2n is driven by a large voltage
  • frame 2n+1 is driven by a small voltage.
  • another mode is that the frame 2n and the frame 2n+1 are driven by driving voltages having different polarities and different sizes.
  • the frame 2n is driven by a positive polarity large voltage
  • the frame 2n+1 is driven by a negative polarity small voltage.
  • the present invention also provides a vertical alignment type liquid crystal display panel driven by the above-described driving method.
  • the liquid crystal display panel includes an image display area 100 and a source driver 200. And a gate driver 300.
  • the image display area 100 includes a plurality of data lines DL (also referred to as data lines, as shown in FIG. 8 for N data lines DL1 ⁇ DLN) and a plurality of scanning lines GL (also referred to as gate lines, as shown in FIG. 8 for M scanning lines GL1 ⁇ GLM)
  • a pixel area 110 formed by staggered configuration.
  • the data line DL and the scan line GL form a pixel region 110 in which one pixel unit 120 is disposed.
  • the source driver 200 transmits the supplied data signal to the image display area 100 through a plurality of data lines DL coupled thereto Medium.
  • the gate driver 300 transmits the supplied scan signal to the image display area 100 through a plurality of scan lines GL coupled thereto.
  • FIG. 10 is an equivalent circuit diagram of the pixel unit 120.
  • Each pixel unit 120 includes a data line DL, a scan line GL, a switch T, a storage capacitor Cst, and a liquid crystal capacitor Clc.
  • the switch T can be a thin film transistor.
  • the data line DL is electrically connected to the source driver 200 for transmitting the data signal provided by the source driver 200 to the image display area 100.
  • the scan line GL is electrically connected to the gate driver 300 for transmitting the scan signal provided by the gate driver 300 to the image display area 100.
  • the switch T is connected between the data line DL and a pixel electrode VA, and the switch T receives the scan signal of the scan line and turns on.
  • the switch T includes a source (not shown in the drawing), a drain (not shown in the drawing), and a gate (not shown in the drawing), and the data line DL is electrically connected to the source.
  • the scan line GL is electrically connected to the gate, and the pixel electrode VA is electrically connected to the drain.
  • the storage capacitor Cst is connected between the pixel electrode VA and the common electrode Com.
  • the liquid crystal capacitor Clc is connected to the pixel electrode VA at one end and connected to a common electrode CF at the other end. Com.
  • the switch T receives the turn-on signal from the scan line GL and turns on, the data signal on the data line DL is transmitted to the storage capacitor Cst via the switch T, and the storage capacitor Cst is stored according to the data signal charging.
  • the pixel electrode VA has a corresponding potential, and the pixel unit 120 displays image data according to the pixel potential.
  • the liquid crystal display panel of the present invention requires only one switch T, and the aperture ratio and transmittance of the pixel are improved by at least 20%.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

提供一种液晶显示面板的驱动方法及液晶显示面板。该驱动方法包括步骤：将一副画面使用两帧图像(2n,2n+1)显示，两帧图像(2n,2n+1)使用不同的驱动电压驱动，以使对应像素单元的液晶分子具有两种取向；将两帧图像的亮度和色度叠加，作为该幅画面的显示图像。通过将一幅画面使用两帧不同驱动电压驱动的图像叠加显示，使对应像素的液晶分子具有两种取向，改善垂直取向液晶显示器大视角对比下降和色偏等缺点，使其视角更广，仅需一个TFT开关至少提高像素开口率和穿透率的20%。

Description

液晶显示面板的驱动方法及液晶显示面板 技术领域
本发明涉及液晶显示器领域，尤其涉及一种液晶显示面板驱动方法及采用该方法驱动的液晶显示面板。
 背景技术
液晶显示器（Liquid crystal display，LCD）以其轻、薄等优点逐渐成为发展最为迅速的平板显示器之一。但是与阴极射线管显示器相比，薄膜晶体管显示器（Thin Film Transistor，TFT-LCD）的视角相对较窄，这就为其在对视角要求严格的高端显示领域的应用带来了很大局限，如航空航天、医疗等领域。随着LCD领域广视角技术的迅速发展，目前很多产品的视角已经可以达到水平视角和垂直视角分别为85°/85°，甚至更大的视角。
垂直配向型液晶显示器(Vertical Alignment Liquid Crystal Display, 简称VA-LCD) 以其宽视野角、高对比度和无须摩擦配向等优势，成为大尺寸TFT-LCD 的常用显示器。其缺点是大视角对比度下降和色偏。
为了解决上述缺点，本领域技术人员设计了多种像素结构来实现降低色偏的目的。常见的针对这种大视角下色偏的对策是采用空间法，即将像素单元的ITO区域划分为若干个畴(Domain)，通过设计多个TFT 的方式令不同畴之间亮度不同，来达到大视角下低色偏的效果。
图1 所为现有技术中具有三个TFT 的像素单元的等效电路图。Gn输出高电平时通过TFT1向A区的液晶电容Clc-A、存储电容Cst-A、电荷共享电容Ccs-A和Ccs-B进行充放电，通过TFT2向B区的液晶电容Clc-B和存储电容Cst-B进行充放电，最后达到基本相同的像素电压VpA和VpB。充放电结束后，TFT1和TFT2关断，Gn+1输出高电平，TFT3打开，通过电荷共享电容Ccs-A和Ccs-B的电容耦合分压，在节点C形成的电压就是B区域最后的像素电压VpB。由于像素电压VpA和像素电压VpB的存在压差，使得不同畴之间的亮度不同，因此实现了大视角下低色偏的效果。
然而，上述设计会使得开口率较正常的像素设计有很大的降低，进而引起Cell( 压接了PCB 和COF 的液晶屏) 穿透率的降低，导致背光源成本的提高。
因此，克服多畴垂直取向模式的缺点，改善垂直取向液晶显示器大视角对比度下降和色偏的缺点，是本领域亟需解决的问题。
 技术问题
本发明所要解决的技术问题是，提供一种液晶显示面板的驱动方法及液晶显示面板，其能够改善垂直取向液晶显示器大视角对比下降和色偏等缺点，使其视角更广。
 技术解决方案
为了解决上述问题，本发明提供了一种液晶显示面板的驱动方法，包括如下步骤：将一幅画面使用两帧图像显示，两帧图像使用不同的驱动电压驱动，以使对应像素单元的液晶分子具有两种取向；将两帧图像的亮度和色度叠加，作为该幅画面的显示图像。
在一实施例中，两帧图像使用极性相同、大小不同的驱动电压驱动。
在一实施例中，两帧图像使用极性不同、大小不同的驱动电压驱动。
本发明还提供一种液晶显示面板，其中，包括多个像素单元，每个像素单元包括：一数据线，用于传输数据信号；一扫描线，用于传输扫描信号；一开关，其连接于所述数据线和一像素电极之间，所述开关接收所述扫描线的扫描信号而开启，所述开关包括源极、漏极及栅极，所述数据线与所述源极电连接，所述扫描线与所述栅极电连接，所述像素电极与所述漏极电连接；一存储电容，其连接于所述像素电极和所述公共电极之间；一液晶电容，其一端连接于所述像素电极，所述液晶电容的另一端连接至一公共电极；若所述开关接收到来自所述扫描线的的开启信号而开启，所述数据线上的数据信号经由所述开关传送至存储电容，存储电容则根据数据信号充电而存储至相应的电位，则所述像素电极具有相对应的电位。
在一实施例中，所述液晶显示面板还包括影像显示区，所述影像显示区包括由多条所述数据线与多条所述扫描线交错配置形成的像素区域，每一所述像素单元设置在所述像素区域内。
在一实施例中，所述液晶显示面板还包括源极驱动器及栅极驱动器，所述源极驱动器通过与其耦接的多条所述数据线将所提供的数据信号传输至影像显示区，所述栅极驱动器通过与其耦接的多条所述扫描线将所提供的扫描信号传输至影像显示区。
本发明还提供一种液晶显示面板，包括多个像素单元，每个像素单元包括：一数据线，用于传输数据信号；一扫描线，用于传输扫描信号；一开关，其连接于所述数据线和一像素电极之间，所述开关接收所述扫描线的扫描信号而开启；一存储电容，其连接于所述像素电极和所述公共电极之间；一液晶电容，其一端连接于所述像素电极；若所述开关接收到来自所述扫描线的的开启信号而开启，所述数据线上的数据信号经由所述开关传送至存储电容，存储电容则根据数据信号充电而存储至相应的电位，则所述像素电极具有相对应的电位。
在一实施例中，所述开关包括源极、漏极及栅极，所述数据线与所述源极电连接，所述扫描线与所述栅极电连接，所述像素电极与所述漏极电连接。
在一实施例中，所述液晶电容的另一端连接至一公共电极。
在一实施例中，所述液晶显示面板还包括影像显示区，所述影像显示区包括由多条所述数据线与多条所述扫描线交错配置形成的像素区域，每一所述像素单元设置在所述像素区域内。
在一实施例中，所述液晶显示面板还包括源极驱动器及栅极驱动器，所述源极驱动器通过与其耦接的多条所述数据线将所提供的数据信号传输至影像显示区，所述栅极驱动器通过与其耦接的多条所述扫描线将所提供的扫描信号传输至影像显示区。
 有益效果
本发明的优点在于，将一幅画面使用两帧不同驱动电压驱动的图像叠加显示，使对应像素的液晶分子在不同时间具有两种取向，改善垂直取向液晶显示器大视角对比下降和色偏等缺点，使其视角更广。另外，本发明液晶显示面板仅只需要一个TFT开关，像素的开口率和穿透率提高至少20%。
 附图说明
图1 是现有技术的垂直配向型液晶显示器具有三个TFT 的像素单元的等效电路图；
图2是现有技术的垂直配向型液晶显示器驱动方法示意图；
图3是现有技术的垂直配向型液晶显示器液晶取向示意图；
图4是采用本发明驱动方法驱动的垂直配向型液晶显示器液晶取向示意图；
图5是采用本发明驱动方法驱动的垂直配向型液晶显示器液晶取向的时间平均效果；
图6是本发明驱动方法的一个实施例的示意图；
图7是本发明驱动方法的另一个实施例的示意图；
图8是本发明垂直配向型液晶显示面板的结构示意图；
图9是本发明像素结构示意图；
图10是像素单元的等效电路图。
 本发明的最佳实施方式
下面结合附图对本发明提供的液晶显示面板的驱动方法及液晶显示面板的具体实施方式做详细说明。
参见图2，现有的垂直配向型液晶显示器对一幅画面采用一种电压驱动，每一图像（Figure）采用一帧（Frame）来显示，图2中，采用图像n表示第n幅图像，采用帧n表示第n帧，每一帧中具有若干像素（Pixel），其中一个像素采用像素M表示。现有的垂直配向型液晶显示器采用一种电压驱动，使得每个像素的液晶分子只有一种取向。参见图3，所有液晶分子具有相同取向偏角α。
而本发明提供一种液晶显示面板的驱动方法，包括如下步骤：
（1）将一幅画面使用两帧图像显示，两帧图像使用不同的驱动电压驱动，以使对应像素单元的液晶分子具有两种取向。
（2）将两帧图像的亮度和色度叠加，作为该幅画面的显示图像。
将一幅画面采用两种驱动电压驱动，使得每个像素的液晶分子在不同时间具有两种取向偏角α和β。参见图4，帧2n和帧2n+1均用来显示图像n，参见图5，帧2n和帧2n+1叠加，用于显示图像n，从时间平均效果来看，一幅画面中的每个像素中的液晶分子在不同时间具有两种取向，视角更广。
其中，帧2n和帧2n+1两帧图像使用不同的驱动电压驱动，可采用如下两种方式：
参见图6，一种方式是帧2n和帧2n+1使用极性相同、大小不同的驱动电压驱动，例如，帧2n采用大电压驱动，帧2n+1采用小电压驱动。
参见图7，另一种方式是帧2n和帧2n+1使用极性不同、大小不同的驱动电压驱动，例如，帧2n采用正极性大电压驱动，帧2n+1采用负极性小电压驱动。
本发明还提供一种采用上述的驱动方法驱动的垂直配向型液晶显示面板。参见图8，所述液晶显示面板包括影像显示区100、源极驱动器200 以及栅极驱动器300。
所述影像显示区100包括由多条数据线DL( 也可称为资料线，如图8所示的N 条数据线DL1 ～ DLN)与多条扫描线GL( 也可称为闸极线，如图8所示的M 条扫描线GL1 ～ GLM)交错配置形成的像素区域110。参见图9，数据线DL和扫描线GL形成了一个像素区域110，在该像素区域110中配置了一个像素单元120。
源极驱动器200 通过与其耦接的多条数据线DL将所提供的数据信号传输至影像显示区100 中。栅极驱动器300 通过与其耦接的多条扫描线GL将所提供的扫描信号传输至影像显示区100 中。
图10是所述像素单元120的等效电路图，每个像素单元120包括一数据线DL、一扫描线GL、一开关T、一存储电容Cst及一液晶电容Clc。所述开关T可以为薄膜晶体管。
所述数据线DL与所述源极驱动器200电连接，用于将所述源极驱动器200提供的数据信号传输至影像显示区100 中。所述扫描线GL与所述栅极驱动器300电连接，用于将所述栅极驱动器300提供的扫描信号传输至影像显示区100中。
所述开关T连接于所述数据线DL和一像素电极VA之间，所述开关T接收所述扫描线的扫描信号而开启。具体地，所述开关T包括源极（附图中未标示）、漏极（附图中未标示）及栅极（附图中未标示），所述数据线DL与所述源极电连接，所述扫描线GL与所述栅极电连接，所述像素电极VA与所述漏极电连接。
所述存储电容Cst连接于所述像素电极VA和公共电极Com之间，所述液晶电容Clc一端连接于所述像素电极VA，另一端连接一公共电极CF Com。
若所述开关T接收到来自所述扫描线GL的开启信号而开启，所述数据线DL上的数据信号经由所述开关T传送至存储电容Cst，存储电容Cst则根据数据信号充电而存储至相应的电位，则所述像素电极VA具有相对应的电位，该像素单元120就依据此显示影像数据。
本发明液晶显示面板仅只需要一个开关T，像素的开口率和穿透率提高至少20%。
综上所述，虽然本发明已以优选实施方式揭露如上，但上述优选实施方式并非用以限制本发明，本领域的普通测试人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (11)

  1. 一种液晶显示面板的驱动方法，其中，包括如下步骤：
    将一幅画面使用两帧图像显示，两帧图像使用不同的驱动电压驱动，以使对应像素单元的液晶分子具有两种取向；
    将两帧图像的亮度和色度叠加，作为该幅画面的显示图像。
  2. 根据权利要求1所述的液晶显示面板的驱动方法，其中，两帧图像使用极性相同、大小不同的驱动电压驱动。
  3. 根据权利要求1所述的液晶显示面板的驱动方法，其中，两帧图像使用极性不同、大小不同的驱动电压驱动。
  4. 一种液晶显示面板，其中，包括多个像素单元，每个像素单元包括：
    一数据线，用于传输数据信号；
    一扫描线，用于传输扫描信号；
    一开关，其连接于所述数据线和一像素电极之间，所述开关接收所述扫描线的扫描信号而开启，所述开关包括源极、漏极及栅极，所述数据线与所述源极电连接，所述扫描线与所述栅极电连接，所述像素电极与所述漏极电连接；
    一存储电容，其连接于所述像素电极和所述公共电极之间；
    一液晶电容，其一端连接于所述像素电极，所述液晶电容的另一端连接至一公共电极；
    若所述开关接收到来自所述扫描线的的开启信号而开启，所述数据线上的数据信号经由所述开关传送至存储电容，存储电容则根据数据信号充电而存储至相应的电位，则所述像素电极具有相对应的电位。
  5. 根据权利要求4所述的液晶显示面板，其中，所述液晶显示面板还包括影像显示区，所述影像显示区包括由多条所述数据线与多条所述扫描线交错配置形成的像素区域，每一所述像素单元设置在所述像素区域内。
  6. 根据权利要求5所述的液晶显示面板，其中，所述液晶显示面板还包括源极驱动器及栅极驱动器，所述源极驱动器通过与其耦接的多条所述数据线将所提供的数据信号传输至影像显示区，所述栅极驱动器通过与其耦接的多条所述扫描线将所提供的扫描信号传输至影像显示区。
  7. 一种液晶显示面板，其中，包括多个像素单元，每个像素单元包括：
    一数据线，用于传输数据信号；
    一扫描线，用于传输扫描信号；
    一开关，其连接于所述数据线和一像素电极之间，所述开关接收所述扫描线的扫描信号而开启；
    一存储电容，其连接于所述像素电极和所述公共电极之间；
    一液晶电容，其一端连接于所述像素电极；
    若所述开关接收到来自所述扫描线的的开启信号而开启，所述数据线上的数据信号经由所述开关传送至存储电容，存储电容则根据数据信号充电而存储至相应的电位，则所述像素电极具有相对应的电位。
  8. 根据权利要求7所述的液晶显示面板，其中，所述开关包括源极、漏极及栅极，所述数据线与所述源极电连接，所述扫描线与所述栅极电连接，所述像素电极与所述漏极电连接。
  9. 根据权利要求7所述的液晶显示面板，其中，所述液晶电容的另一端连接至一公共电极。
  10. 根据权利要求7所述的液晶显示面板，其中，所述液晶显示面板还包括影像显示区，所述影像显示区包括由多条所述数据线与多条所述扫描线交错配置形成的像素区域，每一所述像素单元设置在所述像素区域内。
  11. 根据权利要求10所述的液晶显示面板，其中，所述液晶显示面板还包括源极驱动器及栅极驱动器，所述源极驱动器通过与其耦接的多条所述数据线将所提供的数据信号传输至影像显示区，所述栅极驱动器通过与其耦接的多条所述扫描线将所提供的扫描信号传输至影像显示区。
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