WO2017031944A1 - 像素单元驱动电路、驱动方法和显示装置 - Google Patents

像素单元驱动电路、驱动方法和显示装置 Download PDF

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Publication number
WO2017031944A1
WO2017031944A1 PCT/CN2016/071988 CN2016071988W WO2017031944A1 WO 2017031944 A1 WO2017031944 A1 WO 2017031944A1 CN 2016071988 W CN2016071988 W CN 2016071988W WO 2017031944 A1 WO2017031944 A1 WO 2017031944A1
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Prior art keywords
pixel unit
driving circuit
unit driving
switching elements
alternately
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PCT/CN2016/071988
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English (en)
French (fr)
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辛燕霞
朴承翊
樊浩原
莫再隆
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京东方科技集团股份有限公司
成都京东方光电科技有限公司
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Priority to EP16819414.0A priority Critical patent/EP3171357A4/en
Priority to US15/325,025 priority patent/US10380959B2/en
Publication of WO2017031944A1 publication Critical patent/WO2017031944A1/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
    • G09G3/3614—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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—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
    • 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
    • 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
    • G09G2300/08—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
    • 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
    • G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a liquid crystal panel pixel driving circuit, a driving method thereof, and a display device.
  • Thin Film Transistor-Liquid Crystal Display is the current mainstream flat panel display.
  • Low Temperature Poly-Silicon (LTPS) technology is a new generation of thin film transistor displays with higher resolution and better picture quality.
  • the basic structure of a thin film transistor liquid crystal display includes a liquid crystal panel in which two substrates are combined. By applying an electric field to the substrate, a certain liquid crystal capacitance is formed to control the liquid crystal steering. In order to prevent image degradation due to long-term use of a unidirectional electric field or the like, it is necessary to constantly reverse the polarity of the data voltage with respect to the common voltage. In order to reduce power consumption, a small-sized liquid crystal display usually adopts a column inversion mode. Column inversion is significantly worse in terms of vertical crosstalk than dot inversion.
  • FIG. 1 is a block diagram showing the structure of a conventional pixel unit driving circuit.
  • the panel assembly includes a plurality of scanning signal lines G1-Gn (only scanning signal lines Gi-Gi+4 are shown as an example in FIG. 1) and a plurality of data lines D1-Dm (only in FIG. 1) Dj-Dj+4 is shown as an example) and a pixel unit connected to the scan signal line and the data line.
  • the scanning signal line and the data line are cross-connected with switching elements of the pixel unit and arranged in a matrix form, thereby constituting a pixel unit driving circuit.
  • a switching element of a pixel unit formed by a low temperature polysilicon (LTPS) array is an NMOS transistor, and the driving method thereof is as shown in FIG. 1.
  • the output voltage of the gate has only two values, one is an open voltage (high power) Flat) t1, one is the off voltage (low level) t2.
  • the switching element is turned on, and the pixel of G1 line is charged; when G1 outputs low level t2, the switching element is turned off, the pixel of G1 line is kept; G1 output is low.
  • G2 outputs a high level, and the G2-Gm line mode can be analogized in turn.
  • the data signals on the data lines D1-Dn will run through Pixels of G1-Gm lines.
  • the switching element is not turned on, the capacitive coupling between the data line and the pixel electrode also affects the holding state of the pixels of the G2-Gm line, thereby causing vertical crosstalk of the display picture.
  • the above problems are more serious when the resolution is higher.
  • Fig. 2 shows a schematic diagram of the basic structure of a pixel unit.
  • each of the pixel units includes a switching element Q connected to one of the scanning signal lines G1-Gn and one of the data lines D1-Dm.
  • the switching element may be an NMOS transistor or a PMOS transistor.
  • the present invention proposes a pixel unit driving circuit and method.
  • a pixel unit driving circuit for driving a light emitting element of a pixel unit, the pixel unit driving circuit comprising:
  • the scanning signal line and the data line are cross-connected with switching elements of the pixel unit to form a pixel unit driving circuit in a matrix form, alternately adopting switching elements of opposite polarities, and scanning connected to the switching element
  • the signal lines alternately employ high and low levels to drive the switching elements.
  • a pixel unit driving method for driving a light emitting element of a pixel unit comprising: the scanning signal line and the data line and the The switching elements of the pixel unit are cross-connected to form a pixel unit driving circuit in the form of a matrix in which switching elements of opposite polarities are alternately employed; and switching elements of opposite polarities are alternately driven with scanning signals of high and low levels.
  • a display device including the pixel unit drive circuit as described above is proposed.
  • the rows of the pixel elements are alternately designed by the panel, and the switching elements of the pixel elements of the NMOS transistor and the PMOS transistor are alternately connected, and each row of pixel elements is connected to an adjacent scanning signal line, that is, the scanning signal line and the data line are connected.
  • the switching element of the pixel element is horizontally (vertically) alternately adopting the NMOS tube and the PMOS tube, and combined with the scanning timing, the voltage difference between the data line and the pixel electrode can be alternately changed between positive and negative by the high and low level time division scanning technology, and the improvement is improved. Vertical crosstalk due to parasitic capacitance between the data line and the pixel electrode.
  • FIG. 1 is a block diagram showing the structure of a conventional pixel unit driving circuit.
  • Fig. 2 shows a basic structural diagram of a pixel unit.
  • FIG. 3 is a schematic structural diagram of a pixel unit driving circuit according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of another pixel unit driving circuit according to an embodiment of the present invention.
  • Figure 5 depicts an operational diagram of a prior art pixel cell drive circuit from the perspective of data line voltage.
  • FIG. 6 is a diagram showing the operation of a pixel unit driving circuit according to an embodiment of the present invention from the viewpoint of data line voltage.
  • the switching transistor and the driving transistor used in all embodiments of the present invention may be thin film transistors or field effect transistors or other devices having the same characteristics.
  • the thin film transistor used in the embodiment of the present invention may be an oxide semiconductor transistor. Since the source and drain of the switching transistor used here are symmetrical, the source and the drain can be interchanged. In the embodiment of the present invention, in order to distinguish the two poles of the transistor except the gate, one of the electrodes is referred to as a source and the other is referred to as a drain.
  • FIG. 3 is a schematic structural diagram of a pixel unit driving circuit according to an embodiment of the present invention.
  • the scanning signal lines G1-Gn are parallel to each other in the horizontal direction, and the data lines D1-Dm are parallel to each other in the vertical direction.
  • the scanning signal lines G1-Gn are connected to switching elements that alternately employ NMOS transistors and PMOS transistors.
  • the switching elements are alternately arranged in one row (or one column). Specifically, the scanning signal lines of the odd rows are connected to the switching elements of one polarity, and the scanning signal lines of the even rows are connected to the switching elements of the other polarity.
  • each row of switching elements is connected to the data lines, that is, the switching elements Q connected to the scanning signal lines G1-Gn and the data lines D1-Dm alternately employ an NMOS transistor and a PMOS transistor. That is, the switching elements of any two adjacent pixel cells along each row and column are transistors of opposite polarity. Therefore, the voltage difference between the data line and the pixel electrode alternates between positive and negative, thereby eliminating vertical crosstalk of the display picture due to parasitic capacitance between the data line and the pixel electrode.
  • FIG. 4 is a schematic structural diagram of another pixel unit driving circuit according to an embodiment of the present invention.
  • the switching elements Q connected to the scanning signal lines G1-Gn and the data lines D1-Dm are spaced apart by two in the vertical (horizontal) direction, and NMOS transistors and PMOS transistors are alternately employed.
  • the area inversion mode is realized in units of two rows and two columns, and the voltage difference between the data line and the pixel electrode is alternately changed between positive and negative.
  • Figure 5 depicts an operational diagram of a prior art pixel cell drive circuit from the perspective of data line voltage.
  • the pixel unit driving circuit adopts a column inversion driving method at a certain time, the data line voltage on the switching elements of the odd-numbered columns is positive; and the data voltage on the switching elements of the even-numbered columns is negative; In one data cycle, the data line voltage on the switching elements of the odd columns is negative, and the data voltage on the switching elements of the even columns is positive.
  • the arrow in front of FIG. 5 is the first frame picture, and the arrow in FIG. 5 is followed by the second frame picture.
  • the column inversion driving mode for example, while charging the pixels of the G1 row, the signal on the data line will penetrate through G1-Gm, and the coupling between the data signal and the pixel electrode also affects the retention of pixels of other rows. State, causing crosstalk in the vertical direction of the picture.
  • the data voltage is changed from "+” to "-"
  • a dot scan is performed for a specific switching element, and there are coupling, delay, and vertical crosstalk for the pixel unit from top to bottom.
  • the data signal whose driving period is the positive driving voltage in the previous data signal is converted to the negative driving in the driving period of the next data signal.
  • the data signal of the voltage such that the voltage difference between the data line and the pixel electrode alternates between positive and negative.
  • FIG. 6 is a diagram showing the operation of a pixel unit driving circuit according to an embodiment of the present invention from the viewpoint of data line voltage.
  • the polarity of the switching elements of the pixel unit is alternately changed in units of rows and columns at the same time. Specifically, the polarity of adjacent switching elements of the pixel unit is opposite in row and column.
  • This embodiment of the present invention employs a superposition of two frame inversion modes to implement dot inversion driving. As shown in FIG. 6, the upper frame of the arrow is the first frame picture, and the lower side of the arrow is the second frame picture; the left and right sides of the "+" sign are in the column inversion driving mode, and the scanning signal is provided by two operations.
  • the invention also discloses a display device comprising a plurality of the above pixel unit driving circuits.
  • the display device may be any product or component having a display function such as a liquid crystal panel, an electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.

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Abstract

一种像素单元驱动电路、驱动方法及显示装置。通过面板设计扫描信号线奇偶行交替采用NMOS管、PMOS管开关像素元件，并且扫描信号线(Gi～Gi+4)和数据线（Dj～Dj+4）连接的开关像素元件水平和/或垂直交替采用NMOS管PMOS管，结合扫描时序，可通过高低电平分时扫描技术，实现数据线和像素电极之间的电压差在正和负之间交替改变，改善数据线和像素电极之间的寄生电容而引起产生的垂直串扰。

Description

像素单元驱动电路、驱动方法和显示装置 技术领域
本发明涉及显示技术领域，尤其涉及一种液晶面板像素驱动电路及其驱动方法、以及显示装置。
背景技术
薄膜晶体管液晶显示器(Thin Film Transistor-Liquid CrystalDisplay，简称TFT-LCD)是当前主流的平板显示器。低温多晶硅(Low Temperature Poly-Silicon；LTPS)技术是新一代的薄膜晶体管显示器，具有更高的分辨率和更佳的画面显示品质。薄膜晶体管液晶显示器的基本结构包括由两块基板组合而成的液晶面板。通过给基板施加电场，形成一定的液晶电容以控制液晶转向。为了防止由于长时间使用单向电场等导致的图像劣化，需要不断地反转数据电压相对公共电压的极性。小尺寸液晶显示器为减小功耗，通常采用列反转模式。与点反转相比，列反转在垂直串扰等方面明显较差。
图1示出了传统像素单元驱动电路的结构示意图。如图1所示，面板组件包括：多个扫描信号线G1-Gn(图1中仅示出了扫描信号线Gi-Gi+4作为示例)和多个数据线D1-Dm(图1中仅示出了Dj-Dj+4作为示例)以及与所述扫描信号线和所述数据线相连的像素单元。所述扫描信号线和所述数据线与所述像素单元的开关元件交叉连接并且以矩阵形式排列，从而构成了像素单元驱动电路。一般以低温多晶硅(LTPS)阵列形成的像素单元的开关元件为NMOS管，其驱动方法如图1所示，栅极(扫描信号线)输出电压仅有两种值，一为打开电压(高电平)t1，一为关闭电压(低电平)t2。在每一帧T画面下，G1在输出高电平t1时，开关元件接通，G1行的像素充电；G1输出低电平t2时，开关元件关断，G1行的像素保持；G1输出低电平的同时，G2输出高电平，可以依次类推G2-Gm行工作模式。然而，当G1行的像素充电时，数据线D1-Dn上的数据信号将贯穿 G1-Gm行的像素。虽然开关元件不导通，但是数据线与像素电极之间的电容耦合作用也会影响到G2-Gm行的像素的保持状态，从而引起显示画面的垂直串扰。而且，当分辨率更高时，上述问题会更为严重。
图2示出了像素单元基本结构的示意图。如图2所示，每个像素单元包括与扫描信号线G1-Gn之一和数据线D1-Dm之一连接的开关元件Q。一般情况下开关元件可以采用NMOS晶体管，也可以采用PMOS晶体管。
图1和图2所示的传统像素单元中需要不断地反转数据电压相对于公共电压的极性，所采用的列反转在垂直串扰等方面明显较差。
发明内容
为了克服列反转的垂直串扰，本发明提出了一种像素单元驱动电路和方法。
根据本发明的一个方面，提出了一种像素单元驱动电路，用于对像素单元的发光元件进行驱动，所述像素单元驱动电路包括：
多个扫描信号线，用于提供扫描信号；
多个数据线，用于提供数据信号，
其中所述扫描信号线和所述数据线与所述像素单元的开关元件交叉连接以形成矩阵形式的像素单元驱动电路，交替地采用极性相反的开关元件，并且与所述开关元件相连的扫描信号线交替地采用高低电平来驱动所述开关元件。
根据本发明的另一个方面，提出了一种像素单元驱动方法，用于对像素单元的发光元件进行驱动，所述像素单元驱动方法包括：将所述扫描信号线和所述数据线与所述像素单元的开关元件交叉连接以形成矩阵形式的像素单元驱动电路，其中，交替地采用极性相反的开关元件；以及用高低电平的扫描信号交替地驱动极性相反的开关元件。
根据本发明的又一个方面，提出了一种显示装置，包括如上所述的像素单元驱动电路。
根据本发明实施例，通过面板设计像素元件的行交替采用NMOS管和PMOS管的像素元件的开关元件，并且每行像素元件与相邻的扫描信号线相连，即扫描信号线和数据线连接的像素元件的开关元件水平(垂直)交替采用NMOS管和PMOS管，结合扫描时序，可通过高低电平分时扫描技术，实现数据线和像素电极之间的电压差在正和负之间交替改变，改善由于数据线和像素电极之间的寄生电容引起的垂直串扰。
附图说明
图1示出了传统像素单元驱动电路的结构示意图。
图2示出了像素单元的基本结构示意图。
图3示出了本发明实施例的一种像素单元驱动电路的结构示意图。
图4示出了本发明实施例的另一种像素单元驱动电路的结构示意图。
图5从数据线电压的角度描述了现有的像素单元驱动电路的操作示意图。
图6从数据线电压的角度描述了根据本发明实施例的像素单元驱动电路的操作示意图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚明白，以下结合具体实施例，并参照附图，对本发明实施例进一步详细说明。
本发明所有实施例中采用的开关晶体管和驱动晶体管均可以为薄膜晶体管或场效应管或其他特性相同的器件。优选地，本发明实施例中使用的薄膜晶体管可以是氧化物半导体晶体管。由于这里采用的开关晶体管的源极、漏极是对称的，所以其源极、漏极可以互换。在本发明实施例中，为区分晶体管除栅极之外的两极，将其中一个电极称为源极，另一电极称为漏极。
图3示出了本发明实施例的一种像素单元驱动电路的结构示意图。如 图3所示，在所述像素单元驱动电路中，扫描信号线G1-Gn在水平方向相互平行，数据线D1-Dm在垂直方向相互平行。扫描信号线G1-Gn与交替地采用NMOS晶体管和PMOS管的开关元件相连。在这里，开关元件交替的间隔为一行(或一列)。具体地，奇数行的扫描信号线与一种极性的开关元件相连，偶数行的扫描信号线与另一种极性的开关元件相连。当然，开关元件交替的间隔也可以是两行、三行等等或两列、三列等等。另外，每行开关元件与数据线相连，即与扫描信号线G1-Gn和数据线D1-Dm连接的开关元件Q交替采用NMOS晶体管和PMOS管。也就是说，沿每一行和每一列的任意相邻两个像素单元的开关元件都是极性相反的晶体管。因此，数据线和像素电极之间的电压差在正和负之间交替改变，从而消除了由于数据线和像素电极之间的寄生电容引起的显示画面的垂直串扰。这是针对列反转模式实现的本发明的一种像素单元驱动电路。
图4示出了本发明实施例的另一种像素单元驱动电路的结构示意图。如图4所示，与扫描信号线G1-Gn和数据线D1-Dm连接的开关元件Q在垂直(水平)方向上间隔两个、交替采用NMOS晶体管和PMOS晶体管。由此，以两行和两列为单位实现了区域反转方式，数据线和像素电极之间的电压差在正和负之间也交替改变。
图5从数据线电压的角度描述了现有的像素单元驱动电路的操作示意图。如图5所示，所述像素单元驱动电路采用列反转驱动方式在某一个时刻，奇数列的开关元件上的数据线电压为正；而偶数列的开关元件上的数据电压为负；在下一个数据周期，奇数列的开关元件上的数据线电压为负，而偶数列的开关元件上的数据电压为正。图5的箭头前是第一帧画面，图5的箭头后是第二帧画面。当采用列反转驱动模式时，例如在给G1行的像素充电的同时，数据线上的信号将贯穿G1-Gm，数据信号与像素电极间的耦合作用也会影响到其他行的像素的保持状态，引起画面垂直方向串扰。在数据电压由“+”变成“-”的情况下，针对某一个具体的开关元件而言是按点扫描，针对从上到下的像素单元会存在耦合、延时和垂直串扰。 在时序上相邻的数据信号的驱动期间，由于相邻列的开关元件的极性相同，因此在前一个数据信号驱动周期为正驱动电压的数据信号，在下一个数据信号驱动周期变换为负驱动电压的数据信号，从而使得数据线和像素电极之间的电压差在正和负之间交替改变。
图6从数据线电压的角度描述了根据本发明实施例的像素单元驱动电路的操作示意图。如图6所示，像素单元的开关元件的极性同时以行和列为单位交替地改变。具体地，像素单元的相邻开关元件的极性沿行和列均相反。本发明该实施例采用了两个帧反转方式的叠加来实现点反转驱动。如图6所示，箭头上面是第一帧画面，箭头下面是第二帧画面；“+”号左右两侧按照列反转驱动模式，通过两次操作来提供扫描信号。因为采用了列反转和帧反转相结合的方式，在每次驱动周期期间只需要向一半的像素单元施加电压，从而可以更加省电。类似的，在时序上相邻的数据信号的驱动期间，由于相邻行和相邻列的开关元件极性均相反，因此在前一个数据信号驱动周期为正驱动电压的数据信号，在下一个数据信号驱动周期变换为负驱动电压的数据信号，从而使得数据线和像素电极之间的电压差在正和负之间交替改变，改善数据线和像素电极之间的寄生电容而引起产生的垂直串扰。
本发明还公开了一种显示装置，包括多个上述像素单元驱动电路。所述显示装置可以为：液晶面板、电子纸、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
以上所述的具体实施例，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施例而已，并不用于限制本发明，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (9)

  1. 一种像素单元驱动电路，用于对像素单元的发光元件进行驱动，所述像素单元驱动电路包括：
    多个扫描信号线，用于提供扫描信号；
    多个数据线，用于提供数据信号；
    其中所述扫描信号线和所述数据线与所述像素单元的开关元件交叉连接以形成矩阵形式的像素单元驱动电路，并且交替地采用极性相反的开关元件，
    其中与所述开关元件相连的扫描信号线交替地采用高低电平来驱动所述开关元件。
  2. 根据权利要求1所述的像素单元驱动电路，其中所述开关元件交替地采用NMOS晶体管和PMOS晶体管。
  3. 根据权利要求2所述的像素单元驱动电路，其中所述开关元件奇偶列交替地采用NMOS晶体管和PMOS晶体管。
  4. 根据权利要求2所述的像素单元驱动电路，其中所述开关元件奇偶行交替地采用NMOS晶体管和PMOS晶体管。
  5. 根据权利要求1所述的像素单元驱动电路，其中所述开关元件的交替间隔是多行或多列。
  6. 根据权利要求1所述的像素单元驱动电路，其中所述开关元件的极性交替的间隔是一个像素。
  7. 根据权利要求1所述的像素单元驱动电路，其中奇数行的扫描信号线与一种极性的开关元件相连，偶数行的扫描信号线与另一种极性的开关元件相连。
  8. 一种像素单元驱动方法，用于对像素单元的发光元件进行驱动，所述像素单元驱动方法包括：
    将所述扫描信号线和所述数据线与所述像素单元的开关元件交叉连接以形成矩阵形式的像素单元驱动电路，其中，交替地采用极性相反的开 关元件；以及
    用高低电平的扫描信号交替地驱动所述开关元件。
  9. 一种显示装置，包括根据权利要求1至7中任一项所述的像素单元驱动电路。
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