WO2018120125A1 - 液晶面板的驱动装置及驱动方法 - Google Patents

液晶面板的驱动装置及驱动方法 Download PDF

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Publication number
WO2018120125A1
WO2018120125A1 PCT/CN2016/113743 CN2016113743W WO2018120125A1 WO 2018120125 A1 WO2018120125 A1 WO 2018120125A1 CN 2016113743 W CN2016113743 W CN 2016113743W WO 2018120125 A1 WO2018120125 A1 WO 2018120125A1
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Prior art keywords
pixels
gain
data voltage
polarity
voltage
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PCT/CN2016/113743
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English (en)
French (fr)
Inventor
卢宇程
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武汉华星光电技术有限公司
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Priority to US15/328,456 priority Critical patent/US10192499B2/en
Publication of WO2018120125A1 publication Critical patent/WO2018120125A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
    • 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
    • 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
    • G09G3/3674—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
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0291—Details of output amplifiers or buffers arranged for use in a driving circuit
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • 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
    • G09G2320/0214—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 with crosstalk due to leakage current of pixel switch 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

Definitions

  • the present invention belongs to the field of display technologies, and in particular, to a driving device and a driving method for a liquid crystal panel.
  • LCDs liquid crystal displays
  • Liquid crystal displays typically consist of a liquid crystal panel, a backlight module, and other necessary components.
  • the liquid crystal panel includes a plurality of pixels arranged in an array, each of which includes a thin film transistor (TFT) and a liquid crystal capacitor connected to the TFT (including a storage capacitor if necessary). Through the switching control of the TFT, the liquid crystal capacitor is charged with a data voltage to realize display of different screens.
  • TFT thin film transistor
  • the liquid crystal Since the liquid crystal is driven by the electric field in the same direction for a long time, polarization is easily generated, and finally the deflection in the electric field cannot be normally performed. Therefore, it is necessary to reverse the polarity of the data voltage charged by the liquid crystal capacitor to cause polarization of the surface liquid crystal. .
  • the data voltage is inverted from the positive polarity to the negative polarity, the voltage difference between the source and the gate of the TFT is reduced, which causes the leakage current of the TFT to increase, thereby causing the charge of the liquid crystal capacitor to discharge through the data line, resulting in The display brightness is reduced.
  • the scanning mode in the liquid crystal panel is progressive scanning, the leakage time is gradually increased according to the scanning direction, which causes the display brightness to gradually decrease, and finally the brightness of the display screen of the liquid crystal panel is uneven.
  • an object of the present invention is to provide a driving device for a liquid crystal panel, comprising: a scan driver for applying a scan voltage to pixels arranged in an array in the liquid crystal panel row by row; a driver for receiving image data and a polarity inversion signal, and for acquiring an original data voltage to be supplied to each column of pixels according to the image data, and for using the polarity according to the polarity
  • the inversion signal determines whether the raw data voltage to be supplied to each column of pixels is subjected to voltage line gain in accordance with the scanning direction, and is used to supply the original data voltage or the data voltage after the gain to each column of pixels.
  • the data driver includes: a receiving module configured to receive image data and a polarity inversion signal; and an original data voltage generating module configured to generate, according to the image data, a raw data voltage to be supplied to each column of pixels; a gain a module, configured to determine, according to the polarity inversion signal, whether to perform voltage line gain on a raw data voltage to be supplied to each column of pixels according to a scan direction; and an output module, configured to provide a data voltage after the original data voltage or the gain Each column of pixels.
  • the gain module determines to perform a voltage line gain on the original data voltage to be supplied to each column of pixels in accordance with the scanning direction.
  • the gain module is further configured to perform voltage line gain on the original data voltage to be supplied to each column of pixels by using Equation 1 below.
  • V O V i *(Y*U+X) pn
  • V i represents the original data voltage
  • V O represents the data voltage after the gain
  • (Y*U+X) pn represents the gain coefficient, which gradually increases according to the scanning direction
  • U, X and n are used as reference coefficients, respectively Value
  • Y represents an adjustment factor
  • the gain module sets p to 1; if the polarity inversion signal is inverted from positive polarity to negative polarity, the gain module will p is set to 0.
  • the pixels arranged in the array are divided into a plurality of pixel groups, each pixel group includes at least one row of pixels, the number of groups of the pixel groups gradually increases according to a scanning direction, and Y represents the number of groups of each pixel group. .
  • Another object of the present invention is to provide a driving method of a liquid crystal panel, comprising: applying a scanning voltage to a pixel arranged in an array in a liquid crystal panel row by row; receiving image data and a polarity inversion signal, and according to the image Data acquisition will provide the raw data voltage for each column of pixels; determine, based on the polarity inversion signal, whether to perform voltage line gain on the raw data voltage to be supplied to each column of pixels in accordance with the scan direction; after the original data voltage or gain The data voltage is supplied to each column of pixels.
  • the polarity inversion signal is inverted from the negative polarity to the positive polarity, it is determined according to the scanning direction.
  • a voltage line gain is applied to the raw data voltage to be supplied to each column of pixels.
  • Equation 1 a voltage line gain is performed on the original data voltage to be supplied to each column of pixels by using Equation 1 below.
  • V O V i *(Y*U+X) pn
  • V i represents the original data voltage
  • V O represents the data voltage after the gain
  • (Y*U+X) pn represents the gain coefficient, which gradually increases according to the scanning direction, U, X and n are used as reference coefficients, respectively
  • the value, Y represents an adjustment factor.
  • the pixels arranged in the array are divided into a plurality of pixel groups, and the number of groups of the pixel groups is gradually increased according to the scanning direction, and each pixel group includes at least one row of pixels according to the scanning direction, and Y represents the location of each pixel group. Number of groups.
  • the data voltage applied to the data line is gradually increased in accordance with the scanning direction, so that when the polarity inversion signal is from the positive electrode
  • the polarity is reversed to the negative polarity, the amount of charge charged before the pixel having a serious leakage is large, so that the brightness unevenness of the display screen of the liquid crystal panel can be remarkably reduced.
  • FIG. 1 is a block diagram of a display device in accordance with an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a data driver in accordance with an embodiment of the present invention.
  • FIG. 3 is a flow chart of a driving method of a liquid crystal panel according to an embodiment of the present invention.
  • FIG. 1 is a block diagram of a display device in accordance with an embodiment of the present invention.
  • a display device includes a display panel assembly 100 and a signal controller 200.
  • the display panel assembly 100 comprising: a plurality of pixels PX arranged in an array, N number of scan lines G 1 to G N, M data lines D 1 to D M, a scan driver 110, data driver 120.
  • Each pixel PX is connected to a corresponding scan line G i and a corresponding data line D j , where 1 ⁇ i ⁇ N, 1 ⁇ j ⁇ M.
  • Each of the pixels PX may include a switching device (not shown) connected to the corresponding scanning line G i and the corresponding data line D j ; and a liquid crystal capacitor (not shown) connected to the switching device.
  • the switching device may preferably be a thin film transistor, but the invention is not limited thereto.
  • a storage capacitor, which is connected in parallel with the liquid crystal capacitor, may also be included if necessary.
  • the scan driver 110 is connected to the scan lines G 1 to G N and applies a scan voltage to the scan lines G 1 to G N row by row, which is usually a combination of a high level signal and a low level signal.
  • the data driver 120 is connected to the data lines D 1 to D M and applies data voltages to the data lines D 1 to D M , specifically how they are applied as will be described below.
  • the scan driver 110 and the data driver 120 are integrated and included in the liquid crystal panel assembly 100.
  • the scan driver 110 and the data driver 120 may be mounted on a flexible printed film (not shown) and then attached to the liquid crystal panel assembly 100 (at this time, the liquid crystal panel assembly 100 does not include the scan driver 110 and the data driver 120) .
  • the signal controller 200 controls the operations of the scan driver 110 and the data driver 120.
  • the signal controller 200 is capable of generating a scan control signal CONT1, a data control signal CONT2, and image data DAT.
  • the signal controller 200 transmits the scan control signal CONT1 to the scan driver 110, and transfers the data control signal CONT2 and the image data DAT to the data driver 120.
  • the data control signal CONT2 includes a polarity inversion signal for inverting the polarity of the data voltage supplied to the data line Dj .
  • the data driver 120 in response to the data control signal CONT2 and the image data DAT generates data voltages and the data voltages to the data lines D 1 to D M.
  • the scan driver 110 in response to the scan control signal CONT1 is applied to a progressive scan lines G 1 to G N of the scanning voltage and a high level signal is connected to the scanning line by line conductive lines G 1 to G N of the switching device. Then, the data voltages applied to the data lines D 1 to D M are transmitted to each of the pixels PX through the turned-on switching devices.
  • the polarity inversion signal when the polarity inversion signal is inverted from the negative polarity to the positive polarity, the data voltages applied to the data lines D 1 to D M are gradually increased in accordance with the scanning direction, so that the polarity inversion signal
  • the positive polarity is reversed to the negative polarity, the amount of charge charged before the pixel PX having a large leakage is large, so that the brightness unevenness of the display screen of the liquid crystal panel can be remarkably reduced.
  • FIG. 2 is a schematic diagram of a data driver in accordance with an embodiment of the present invention.
  • a data driver 120 includes a receiving module 121, an original data voltage generating module 122, a gain module 123, and an output module 124.
  • data driver 120 may include other and/or different modules. Similarly, the functions of the above modules can be combined into a single component.
  • the receiving module 121 is configured to receive image data DAT and a polarity inversion signal (which are included in the data control signal CONT2).
  • the signal controller 200 transmits the data control signal CONT2 and the image data DAT to the receiving module 121 of the data driver 120, the receiving module 121 receives the data control signal CONT2 and the image data DAT, and transmits the received image data DAT to the original data voltage generating module. 122, and the data control signal CONT2 is transmitted to the gain module 123.
  • the raw data voltage generation module 122 receives the image data DAT.
  • the raw data voltage generating module 122 converts the image data DAT to be supplied to the gray voltage corresponding to the image data DAT from the plurality of gray voltages supplied from the gray voltage generating means (not shown) according to the image data DAT
  • the raw data voltage of data line D j (ie, each column of pixels PX).
  • the raw data voltage generation module 122 transmits the raw data voltage it generates to the gain block 123.
  • the gain module 123 receives the data control signal CONT2 and the raw data voltage.
  • the gain block 123 determines whether to perform voltage line gain on the original data voltage in accordance with the scan direction based on the polarity inversion signal in the data control signal CONT2.
  • the gain module 123 determines to perform a voltage line gain on the original data voltage in accordance with the scan direction, and transmits the gaind data voltage to the output module 124. If the polarity inversion signal is inverted from negative polarity to positive polarity, the gain module 123 determines not to perform voltage line gain on the raw data voltage and transmits the raw data voltage to the output module 124.
  • the gain module 123 performs a voltage line gain on the raw data voltage using Equation 1 below.
  • V O V i *(Y*U+X) pn
  • V i represents the original data voltage
  • V O represents the data voltage after the gain
  • (Y*U+X) pn represents the gain coefficient, which gradually increases according to the scanning direction
  • U, X and n are used as reference coefficients, respectively
  • the value, Y represents an adjustment factor.
  • Y may represent the number of rows of pixels that are charged with the data voltage at this time, but the present invention is not limited thereto.
  • the pixels arranged in the array may be divided into a plurality of pixel groups in units of rows, and the number of groups of the pixel groups is gradually increased according to the scanning direction, and each pixel group includes at least two rows of pixels, then Y represents The number of groups per pixel group.
  • the switching device is an NMOS type thin film transistor.
  • the gain module 123 sets p to 1; if the polarity inversion signal is inverted from positive polarity to negative polarity, the gain module 123 sets p Set to 0.
  • the switching device may be a PMOS type thin film transistor.
  • the gain module 123 sets p to 0; if the polarity inversion signal is inverted from the positive polarity to the negative polarity, the gain module 123 sets the p Set to 1.
  • the switching device may also be other types of thin film crystals.
  • a tube such as a CMOS type thin film transistor, in which the condition in which the voltage line gain occurs can be appropriately adjusted according to the design type of the switching device.
  • the output module 124 receives the raw data voltage or the data voltage after the gain.
  • the output module 124 outputs the raw data voltage or the data voltage after the gain to the data lines D 1 to D M .
  • FIG. 3 is a flow chart of a driving method of a liquid crystal panel according to an embodiment of the present invention.
  • a driving method of a liquid crystal panel includes:
  • Step S310 the scan driver 110 in response to the scan control signal CONT1 is applied to a progressive scan lines G 1 to G N of the scanning voltage and a high level signal is connected to the scanning line by line conductive lines G 1 to G N of the switching device, whereby A scan voltage is applied to the scan lines G 1 to G N row by row.
  • step S320 the receiving module 121 receives the image data DAT and the polarity inversion signal (which are included in the data control signal CONT2), and the original data voltage generating module 122 is from the gray voltage generating device (not shown) according to the image data DAT.
  • the gray voltage corresponding to the image data DAT is selected to convert the image data DAT into the original data voltage to be supplied to the data line D j (i.e., each column of pixels PX).
  • step S330 the gain module 123 determines whether to perform voltage line gain on the original data voltage according to the scan direction according to the polarity inversion signal in the data control signal CONT2.
  • the gain module 123 determines to perform a voltage line gain on the original data voltage according to the scan direction, and transmits the gained data voltage to the output module 124. If the polarity inversion signal is inverted from negative polarity to positive polarity, the gain module 123 determines not to perform voltage line gain on the raw data voltage and transmits the raw data voltage to the output module 124.
  • the gain module 123 performs voltage line gain on the original data voltage using Equation 1 above.
  • the gain block 123 sets p in the above formula 1 to 1; and if the polarity inversion signal is inverted from positive polarity to negative polarity, Then the gain module 123 will set p in the above formula 1 to 0.
  • step S340 the output module 124 outputs the original data voltage or the data voltage after the gain to the data lines D 1 to D M .
  • the above method according to the present invention can be implemented as computer code in a computer readable recording medium.
  • the computer code can be implemented by those skilled in the art in accordance with the description of the above method.
  • the above method of the present invention is implemented when the computer code is executed in a computer.
  • each device or module in the display device may be implemented as a hardware component.
  • One skilled in the art can implement various devices or modules using, for example, a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), depending on the processing performed by the various devices or modules defined.
  • FPGA field programmable gate array
  • ASIC application specific integrated circuit
  • the data voltage applied to the data line is gradually increased in accordance with the scanning direction, so that when the polarity inversion signal is When the positive polarity is reversed to the negative polarity, the amount of charge charged before the pixel having a large leakage current is large, so that the brightness unevenness of the display screen of the liquid crystal panel can be remarkably reduced.

Abstract

一种液晶面板的驱动装置，其包括：扫描驱动器（110），用于向液晶面板中阵列排布的像素（PX）逐行施加扫描电压；数据驱动器（120），用于接收图像数据（DAT）和极性反转信号，且用于根据图像数据（DAT）获取将提供给每列像素（PX）的原始数据电压，且用于根据极性反转信号确定是否按照扫描方向对将提供给每列像素（PX）的原始数据电压进行电压行增益，且用于将原始数据电压或增益后的数据电压提供给每列像素（PX）。一种液晶面板的驱动方法，当极性反转信号由负极性反转为正极性时，将施加到数据线（D1-D M）的数据电压按照扫描方向逐渐递增，这样当极性反转信号由正极性反转为负极性时，由于漏电严重的像素（PX）之前被充入的电荷量较大，所以能够明显降低液晶面板显示画面亮度不均的现象。

Description

液晶面板的驱动装置及驱动方法 技术领域
本发明属于显示技术领域，具体地讲，涉及一种液晶面板的驱动装置及驱动方法。
背景技术
随着光电与半导体技术的演进，也带动了平板显示器(Flat Panel Display)的蓬勃发展，而在诸多平板显示器中，液晶显示器(Liquid Crystal Display，简称LCD)因具有高空间利用效率、低消耗功率、无辐射以及低电磁干扰等诸多优越特性，已被应用于生产生活的各个方面。
液晶显示器通常由液晶面板、背光模块以及其它必须的组件构成。液晶面板中包括阵列排布的多个像素，每个像素包括薄膜晶体管(TFT)以及与TFT连接的液晶电容器(如有必要，还可以包括存储电容器)。通过TFT的开关控制，为液晶电容器充入数据电压，以实现不同画面的显示。
由于液晶长时间在相同方向的电场驱动下，容易产生极化，最终导致无法正常的在电场中偏转，因此需要对液晶电容器充入的数据电压进行极性反转，以表面液晶出现极化现象。然而，当数据电压由正极性反转为负极性时，TFT的源极与栅极的压差减小，这将导致TFT的漏电流增大，从而使得液晶电容器的电荷通过数据线放电，导致显示亮度降低。并且由于液晶面板中的扫描方式为逐行扫描，故漏电时间按照扫描方向逐渐递增，导致显示亮度逐渐降低，最终导致液晶面板显示画面亮度不均。
发明内容
为了解决上述现有技术存在的问题，本发明的目的在于提供一种用于液晶面板的驱动装置，其包括：扫描驱动器，用于向液晶面板中阵列排布的像素逐行施加扫描电压；数据驱动器，用于接收图像数据和极性反转信号，且用于根据所述图像数据获取将提供给每列像素的原始数据电压，且用于根据所述极性 反转信号确定是否按照扫描方向对将提供给每列像素的原始数据电压进行电压行增益，且用于将原始数据电压或增益后的数据电压提供给每列像素。
进一步地，所述数据驱动器包括：接收模块，用于接收图像数据和极性反转信号；原始数据电压产生模块，用于根据所述图像数据产生将提供给每列像素的原始数据电压；增益模块，用于根据所述极性反转信号确定是否按照扫描方向对将提供给每列像素的原始数据电压进行电压行增益；输出模块，用于将原始数据电压或增益后的数据电压提供给每列像素。
进一步地，若极性反转信号由负极性反转为正极性，则所述增益模块确定按照扫描方向对将提供给每列像素的原始数据电压进行电压行增益。
进一步地，所述增益模块进一步用于利用下面的式子1对将提供给每列像素的原始数据电压进行电压行增益，
[式子1]  VO＝Vi*(Y*U+X)pn
其中，Vi表示原始数据电压，VO表示增益后的数据电压，(Y*U+X)pn表示增益系数，其按照扫描方向逐渐增大，U、X和n作为参考系数，分别为一定值，Y表示一调节系数；
其中，若极性反转信号由负极性反转为正极性，则所述增益模块将p设定为1；若极性反转信号由正极性反转为负极性，则所述增益模块将p设定为0。
进一步地，所述阵列排布的像素被划分为多个像素组，每个像素组包括至少一行像素，所述像素组的组数按照扫描方向逐渐增大，Y表示每个像素组的组数。
本发明的另一目的还在于提供一种液晶面板的驱动方法，其包括：向液晶面板中阵列排布的像素逐行施加扫描电压；接收图像数据和极性反转信号，并根据所述图像数据获取将提供给每列像素的原始数据电压；根据所述极性反转信号确定是否按照扫描方向对将提供给每列像素的原始数据电压进行电压行增益；将原始数据电压或增益后的数据电压提供给每列像素。
进一步地，若极性反转信号由负极性反转为正极性，则确定按照扫描方向 对将提供给每列像素的原始数据电压进行电压行增益。
进一步地，利用下面的式子1对将提供给每列像素的原始数据电压进行电压行增益，
[式子1]  VO＝Vi*(Y*U+X)pn
其中，Vi表示原始数据电压；VO表示增益后的数据电压；(Y*U+X)pn表示增益系数，其按照扫描方向逐渐增大，U、X和n作为参考系数，分别为一定值，Y表示一调节系数。
进一步地，若极性反转信号由负极性反转为正极性，则p＝1；若极性反转信号由正极性反转为负极性，则p＝0。
进一步地，将阵列排布的像素划分为多个像素组，所述像素组的组数按照扫描方向逐渐增大，每个像素组按照扫描方向至少包括一行像素，Y表示每个像素组所在的组数。
本发明的有益效果：在本发明中，当极性反转信号由负极性反转为正极性时，将施加到数据线的数据电压按照扫描方向逐渐递增，这样当极性反转信号由正极性反转为负极性时，由于漏电严重的像素之前被充入的电荷量较大，所以能够明显降低液晶面板显示画面亮度不均的现象。
附图说明
通过结合附图进行的以下描述，本发明的实施例的上述和其它方面、特点和优点将变得更加清楚，附图中：
图1是根据本发明的实施例的显示装置的架构图；
图2是根据本发明的实施例的数据驱动器的模式图；
图3是根据本发明的实施例的液晶面板的驱动方法的流程图。
具体实施方式
以下，将参照附图来详细描述本发明的实施例。然而，可以以许多不同的形式来实施本发明，并且本发明不应该被解释为限制于这里阐述的具体实施 例。相反，提供这些实施例是为了解释本发明的原理及其实际应用，从而使本领域的其他技术人员能够理解本发明的各种实施例和适合于特定预期应用的各种修改。
图1是根据本发明的实施例的显示装置的架构图。
参照图1，根据本发明的实施例的显示装置包括：显示面板组件100和信号控制器200。
显示面板组件100包括：阵列排布的多个像素PX、N条扫描线G1至GN、M条数据线D1至DM、扫描驱动器110、数据驱动器120。
每个像素PX连接到对应的扫描线Gi和对应的数据线Dj，其中1≤i≤N，1≤j≤M。每个像素PX可以包括：开关器件(未示出)，连接到对应的扫描线Gi和对应的数据线Dj；液晶电容器(未示出)，连接到该开关器件。在本实施例中，该开关器件可优选为薄膜晶体管，但本发明并不限制于此。如有必要，还可以包括存储电容器，其与液晶电容器并联。
扫描驱动器110连接到扫描线G1至GN，并向扫描线G1至GN逐行施加扫描电压，该扫描电压通常由高电平信号和低电平信号组合而成。
数据驱动器120连接到数据线D1至DM，并向数据线D1至DM施加数据电压，具体如何施加将在下面描述。
在本实施例中，扫描驱动器110和数据驱动器120被集成而包括于液晶面板组件100中。可替换地，扫描驱动器110和数据驱动器120可以被安装在柔性印刷薄膜(未示出)上，然后附接到液晶面板组件100(此时液晶面板组件100不包含扫描驱动器110和数据驱动器120)。
信号控制器200控制扫描驱动器110和数据驱动器120的操作。
信号控制器200能够产生扫描控制信号CONT1、数据控制信号CONT2和图像数据DAT。信号控制器200将扫描控制信号CONT1传送到扫描驱动器110，并将数据控制信号CONT2和图像数据DAT传送到数据驱动器120。在本实施例中，数据控制信号CONT2包括极性反转信号，用于反转提供给数据 线Dj的数据电压的极性。
数据驱动器120响应于数据控制信号CONT2和图像数据DAT产生数据电压，并将数据电压施加到数据线D1至DM。
扫描驱动器110响应于扫描控制信号CONT1逐行向扫描线G1至GN施加为高电平信号的扫描电压而逐行导通连接到扫描线G1至GN的开关器件。然后，施加到数据线D1至DM的数据电压通过导通的开关器件而被传送到每个像素PX。
诚如背景技术中描述，当施加到数据线D1至DM的数据电压由正极性反转为负极性时，开关器件的源极与栅极的压差减小，导致开关器件的漏电流增大，从而使得液晶电容器的电荷通过其连接的对应的数据线Dj放电，导致显示亮度降低，并且由于漏电时间按照扫描方向逐渐递增，导致显示亮度逐渐降低，最终导致液晶面板显示画面亮度不均。
本实施例为了解决上述问题，当极性反转信号由负极性反转为正极性时，将施加到数据线D1至DM的数据电压按照扫描方向逐渐递增，这样当极性反转信号由正极性反转为负极性时，由于漏电严重的像素PX之前被充入的电荷量较大，所以能够明显减弱液晶面板显示画面亮度不均的现象。以下将进行详细的描述。
图2是根据本发明的实施例的数据驱动器的模式图。
参照图2，根据本发明的实施例的数据驱动器120包括：接收模块121、原始数据电压产生模块122、增益模块123、输出模块124。根据本发明的其他实施方式，数据驱动器120可包括其他和/或不同的模块。类似的，上述模块的功能可合并为单个组件。
接收模块121用于接收图像数据DAT和极性反转信号(其包括于数据控制信号CONT2中)。信号控制器200将数据控制信号CONT2和图像数据DAT传送到数据驱动器120的接收模块121，接收模块121接收数据控制信号CONT2和图像数据DAT，并将接收的图像数据DAT传送至原始数据电压产生模块122，且将数据控制信号CONT2传送至增益模块123。
原始数据电压产生模块122接收图像数据DAT。原始数据电压产生模块122根据图像数据DAT从由灰度电压产生装置(未示出)提供的多个灰度电压中选择与图像数据DAT对应的灰度电压而将图像数据DAT转换为将提供给数据线Dj(即每列像素PX)的原始数据电压。原始数据电压产生模块122将其产生的原始数据电压传送至增益模块123。
增益模块123接收数据控制信号CONT2和原始数据电压。增益模块123根据数据控制信号CONT2中的极性反转信号确定是否按照扫描方向对原始数据电压进行电压行增益。
若极性反转信号由负极性反转为正极性，则增益模块123确定按照扫描方向对原始数据电压进行电压行增益，并将增益后的数据电压传送至输出模块124。若极性反转信号由负极性反转为正极性，则增益模块123确定不对原始数据电压进行电压行增益，并将原始数据电压传送至输出模块124。
优选地，增益模块123利用下面的式子1对原始数据电压进行电压行增益。
[式子1]  VO＝Vi*(Y*U+X)pn
其中，Vi表示原始数据电压，VO表示增益后的数据电压，(Y*U+X)pn表示增益系数，其按照扫描方向逐渐增大，U、X和n作为参考系数，分别为一定值，Y表示一调节系数。这里，优选地，Y可以表示此时被充入数据电压的像素的所在行数，但本发明并不限制于此。作为本发明的其他实施方式，可以以行为单位将阵列排布的像素划分为多个像素组，像素组的组数按照扫描方向逐渐增大，每个像素组包括至少两行像素，那么Y表示每个像素组的组数。
在本实施例中，优选地，所述开关器件为NMOS型薄膜晶体管。这样，若极性反转信号由负极性反转为正极性，则增益模块123将p设定为1；若极性反转信号由正极性反转为负极性，则增益模块123将p设定为0。
作为本发明的另一实施例，所述开关器件可以为PMOS型薄膜晶体管。这样，若极性反转信号由负极性反转为正极性，则增益模块123将p设定为0；若极性反转信号由正极性反转为负极性，则增益模块123将p设定为1。
应当说明的是，在本发明中，所述开关器件还可以是其他类型的薄膜晶体 管，诸如CMOS型薄膜晶体管，其中电压行增益发生的条件可根据所述开关器件的设计类型而作合适的调整。
输出模块124接收原始数据电压或增益后的数据电压。输出模块124将原始数据电压或增益后的数据电压输出至数据线D1至DM。
图3是根据本发明的实施例的液晶面板的驱动方法的流程图。
参照图1至图3，根据本发明的实施例的液晶面板的驱动方法包括：
步骤S310，扫描驱动器110响应于扫描控制信号CONT1逐行向扫描线G1至GN施加为高电平信号的扫描电压而逐行导通连接到扫描线G1至GN的开关器件，从而对扫描线G1至GN逐行施加扫描电压。
步骤S320，接收模块121接收图像数据DAT和极性反转信号(其包括于数据控制信号CONT2中)，并且原始数据电压产生模块122根据图像数据DAT从由灰度电压产生装置(未示出)提供的多个灰度电压中选择与图像数据DAT对应的灰度电压而将图像数据DAT转换为将提供给数据线Dj(即每列像素PX)的原始数据电压。
步骤S330，增益模块123根据数据控制信号CONT2中的极性反转信号确定是否按照扫描方向对原始数据电压进行电压行增益。
具体地，若极性反转信号由负极性反转为正极性，则增益模块123确定按照扫描方向对原始数据电压进行电压行增益，并将增益后的数据电压传送至输出模块124。若极性反转信号由负极性反转为正极性，则增益模块123确定不对原始数据电压进行电压行增益，并将原始数据电压传送至输出模块124。
优选地，在步骤S330中，增益模块123利用上面的式子1对原始数据电压进行电压行增益。
此外，若极性反转信号由负极性反转为正极性，则增益模块123将上面的式子1中的p设定为1；若极性反转信号由正极性反转为负极性，则增益模块123将将上面的式子1中的p设定为0。
步骤S340，输出模块124将原始数据电压或增益后的数据电压输出至数据 线D1至DM。
此外，根据本发明的上述方法可以被实现为计算机可读记录介质中的计算机代码。本领域技术人员可以根据对上述方法的描述来实现所述计算机代码。当所述计算机代码在计算机中被执行时实现本发明的上述方法。
此外，根据本发明的实施例的显示装置中的各个器件或模块可被实现为硬件组件。本领域技术人员根据限定的各个器件或模块所执行的处理，可以使用例如现场可编程门阵列(FPGA)或专用集成电路(ASIC)来实现各个器件或模块。
综上所述，根据本发明的实施例，当极性反转信号由负极性反转为正极性时，将施加到数据线的数据电压按照扫描方向逐渐递增，这样当极性反转信号由正极性反转为负极性时，由于漏电严重的像素之前被充入的电荷量较大，所以能够明显降低液晶面板显示画面亮度不均的现象。
虽然已经参照特定实施例示出并描述了本发明，但是本领域的技术人员将理解：在不脱离由权利要求及其等同物限定的本发明的精神和范围的情况下，可在此进行形式和细节上的各种变化。

Claims (15)

  1. 一种液晶面板的驱动装置，其中，包括：
    扫描驱动器，用于向液晶面板中阵列排布的像素逐行施加扫描电压；
    数据驱动器，用于接收图像数据和极性反转信号，且用于根据所述图像数据获取将提供给每列像素的原始数据电压，且用于根据所述极性反转信号确定是否按照扫描方向对将提供给每列像素的原始数据电压进行电压行增益，且用于将原始数据电压或增益后的数据电压提供给每列像素。
  2. 根据权利要求1所述的驱动装置，其中，所述数据驱动器包括：
    接收模块，用于接收图像数据和极性反转信号；
    原始数据电压产生模块，用于根据所述图像数据产生将提供给每列像素的原始数据电压；
    增益模块，用于根据所述极性反转信号确定是否按照扫描方向对将提供给每列像素的原始数据电压进行电压行增益；
    输出模块，用于将原始数据电压或增益后的数据电压提供给每列像素。
  3. 根据权利要求2所述的驱动装置，其中，若极性反转信号由负极性反转为正极性，则所述增益模块确定按照扫描方向对将提供给每列像素的原始数据电压进行电压行增益。
  4. 根据权利要求2所述的驱动装置，其中，所述增益模块进一步用于利用下面的式子1对将提供给每列像素的原始数据电压进行电压行增益，
    [式子1]VO＝Vi*(Y*U+X)pn
    其中，Vi表示原始数据电压，VO表示增益后的数据电压，(Y*U+X)pn表示增益系数，其按照扫描方向逐渐增大，U、X和n作为参考系数，分别为一定值，Y表示一调节系数；
    其中，若极性反转信号由负极性反转为正极性，则所述增益模块将p设定为1；若极性反转信号由正极性反转为负极性，则所述增益模块将p设定为0。
  5. 根据权利要求3所述的驱动装置，其中，所述增益模块进一步用于利用下面的式子1对将提供给每列像素的原始数据电压进行电压行增益，
    [式子1]VO＝Vi*(Y*U+X)pn
    其中，Vi表示原始数据电压，VO表示增益后的数据电压，(Y*U+X)pn表示增益系数，其按照扫描方向逐渐增大，U、X和n作为参考系数，分别为一定值，Y表示一调节系数；
    其中，若极性反转信号由负极性反转为正极性，则所述增益模块将p设定为1；若极性反转信号由正极性反转为负极性，则所述增益模块将p设定为0。
  6. 根据权利要求4所述的驱动装置，其中，所述阵列排布的像素被划分为多个像素组，每个像素组包括至少一行像素，所述像素组的组数按照扫描方向逐渐增大，Y表示每个像素组的组数。
  7. 根据权利要求5所述的驱动装置，其中，所述阵列排布的像素被划分为多个像素组，每个像素组包括至少一行像素，所述像素组的组数按照扫描方向逐渐增大，Y表示每个像素组的组数。
  8. 一种液晶面板的驱动方法，其中，包括：
    向液晶面板中阵列排布的像素逐行施加扫描电压；
    接收图像数据和极性反转信号，并根据所述图像数据获取将提供给每列像素的原始数据电压；
    根据所述极性反转信号确定是否按照扫描方向对将提供给每列像素的原始数据电压进行电压行增益；
    将原始数据电压或增益后的数据电压提供给每列像素。
  9. 根据权利要求8所述的驱动方法，其中，若极性反转信号由负极性反转为正极性，则确定按照扫描方向对将提供给每列像素的原始数据电压进行电 压行增益。
  10. 根据权利要求8所述的驱动方法，其中，利用下面的式子1对将提供给每列像素的原始数据电压进行电压行增益，
    [式子1]VO＝Vi*(Y*U+X)pn
    其中，Vi表示原始数据电压；VO表示增益后的数据电压；(Y*U+X)pn表示增益系数，其按照扫描方向逐渐增大，U、X和n作为参考系数，分别为一定值，Y表示一调节系数。
  11. 根据权利要求9所述的驱动方法，其中，利用下面的式子1对将提供给每列像素的原始数据电压进行电压行增益，
    [式子1]VO＝Vi*(Y*U+X)pn
    其中，Vi表示原始数据电压；VO表示增益后的数据电压；(Y*U+X)pn表示增益系数，其按照扫描方向逐渐增大，U、X和n作为参考系数，分别为一定值，Y表示一调节系数。
  12. 根据权利要求10所述的驱动方法，其中，若极性反转信号由负极性反转为正极性，则p＝1；若极性反转信号由正极性反转为负极性，则p＝0。
  13. 根据权利要求11所述的驱动方法，其中，若极性反转信号由负极性反转为正极性，则p＝1；若极性反转信号由正极性反转为负极性，则p＝0。
  14. 根据权利要求10所述的驱动方法，其中，将阵列排布的像素划分为多个像素组，所述像素组的组数按照扫描方向逐渐增大，每个像素组按照扫描方向至少包括一行像素，Y表示每个像素组所在的组数。
  15. 根据权利要求11所述的驱动方法，其中，将阵列排布的像素划分为多个像素组，所述像素组的组数按照扫描方向逐渐增大，每个像素组按照扫描方向至少包括一行像素，Y表示每个像素组所在的组数。
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