WO2012139312A1 - 液晶显示器及其驱动方法 - Google Patents

液晶显示器及其驱动方法 Download PDF

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Publication number
WO2012139312A1
WO2012139312A1 PCT/CN2011/073714 CN2011073714W WO2012139312A1 WO 2012139312 A1 WO2012139312 A1 WO 2012139312A1 CN 2011073714 W CN2011073714 W CN 2011073714W WO 2012139312 A1 WO2012139312 A1 WO 2012139312A1
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WO
WIPO (PCT)
Prior art keywords
voltage
scan
liquid crystal
crystal display
thin film
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PCT/CN2011/073714
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English (en)
French (fr)
Inventor
赵登霞
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深圳市华星光电技术有限公司
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Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to DE112011105054.2T priority Critical patent/DE112011105054B4/de
Priority to US13/260,369 priority patent/US9412322B2/en
Publication of WO2012139312A1 publication Critical patent/WO2012139312A1/zh

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—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
    • G09G3/3674—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
    • 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
    • G09G2300/0876—Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0219—Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
    • 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
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular, to a liquid crystal display and a driving method thereof. ⁇ Background technique ⁇
  • liquid crystal display devices have been widely used in various electronic products such as computer monitors, televisions, notebook computers, mobile phones, and digital cameras due to their advantages of lightness, power saving, and low radiation.
  • FIG. 1 is a schematic diagram of a circuit structure of a prior art liquid crystal display.
  • the liquid crystal display 10 includes a liquid crystal panel 11, a scan voltage generator 12, a scan driver 13, a data driver 14, and a common voltage generator 15.
  • the scan driver 13 and the data driver 14 are used to drive the liquid crystal panel 11,
  • the common voltage generator 15 is used to supply the liquid crystal panel 11 with a common voltage VCOM, and
  • the scan voltage generator 12 is used to provide the scan driver 13 with a first scan voltage. VGL and a second scan voltage VGH.
  • the liquid crystal panel 11 includes a plurality of scanning lines 131 which are parallel to each other, and a plurality of data lines 141 which are parallel to each other and which are disposed in an insulated manner with the scanning lines 131.
  • the scan line 131 and the data line 141 define a plurality of pixel regions 102.
  • a thin film transistor 103, a liquid crystal capacitor 104, and a storage capacitor 105 are disposed in each of the pixel regions 102 at a intersection of the scan line 131 and the data line 141.
  • the liquid crystal capacitor 104 is composed of a pixel electrode 1041, a common electrode 1042, and a liquid crystal layer (not shown) sandwiched therebetween.
  • the storage capacitor 105 is composed of a pixel electrode 1041, a storage electrode 1051, and an insulating material (not shown) sandwiched therebetween.
  • the gate (not labeled) of the thin film transistor 103 is connected to the scanning line 131, the source (not labeled) is connected to the data line 141, and the drain (not labeled) is connected to the pixel electrode 1041.
  • the scan voltage generator 12 supplies the first scan voltage VGL and the second scan voltage VGH to the scan driver 13, and the scan driver 13 sequentially outputs according to the two scan voltages VGL and VGH. Multiple scan signals to each scan line.
  • the scan driver 13 outputs the scan signal to the one-line scan line 131
  • the thin film transistor 103 connected to the row scan line 131 is turned on, and at the same time, the data driver 14 supplies a plurality of gray scale voltages to the plurality of data lines 141 to make the gray scale voltage
  • the source and the drain of the turned-on thin film transistor 103 are loaded to the pixel electrode 1041.
  • the common electrode 1042 therefore, after the gray scale voltage is applied to the pixel electrode 1041 via the source and the drain of the turned-on thin film transistor 103, since there is a voltage difference between the common voltage VCOM and the gray scale voltage on the liquid crystal capacitor 104, The liquid crystal is deflected to display the desired gray level according to the angle at which the liquid crystal is deflected.
  • the function of the storage capacitor 105 is to maintain the gray scale voltage on the pixel electrode 1041 so that the gray scale voltage on the pixel electrode 1041 is maintained until the next gray scale voltage comes.
  • the technical problem to be solved by the present invention is to provide a liquid crystal display and a driving method thereof to solve the problem of squeezing.
  • a technical solution adopted by the present invention is: Providing a liquid crystal display comprising a liquid crystal panel, a scan driver and a common voltage generator, the liquid crystal panel comprising a plurality of scan lines and a plurality of data lines , multiple scan lines and multiple data lines are insulated in an insulated manner And a plurality of pixel regions arranged in a matrix, wherein each of the pixel regions is provided with a thin film transistor and a storage capacitor, the storage capacitor includes a pixel electrode and a storage electrode disposed opposite to each other, and the thin film transistor includes a gate and a gate a source and a drain, a gate connected to a scan line, a source connected to a data line, a drain connected to the pixel electrode, and a common voltage generator providing a common voltage for the storage electrode, wherein the liquid crystal display further comprises a scan voltage regeneration
  • the scan voltage regenerator includes an adder and a capacitor, the adder includes a first voltage input terminal, a second voltage input terminal,
  • a liquid crystal display comprising a liquid crystal panel and a common voltage generator, the liquid crystal panel comprising a plurality of pixel regions arranged in a matrix manner, each A thin film transistor and a storage capacitor are disposed in the pixel region, the storage capacitor includes a pixel electrode and a storage electrode disposed opposite to each other, the common voltage generator provides a common voltage for the storage electrode, and the liquid crystal panel further includes a scan voltage regenerator, and the scan voltage regenerator The storage electrode receives the feedback common voltage and generates a regenerative scan voltage for driving the thin film transistor according to the feedback common voltage.
  • the liquid crystal panel includes a plurality of scan lines and a plurality of data lines.
  • the plurality of scan lines and the plurality of data lines are disposed in an insulated manner to define a pixel region.
  • the thin film transistor includes a gate, a source, and a drain. The gate is connected to a scan line, the source is connected to a data line, and the drain is connected to the pixel electrode.
  • the scan voltage regenerator includes an adder and a DC blocking component, wherein the adder includes a first voltage input terminal, a second voltage input terminal, and a voltage output terminal, and the first voltage input terminal receives the feedback via the DC blocking component
  • the common voltage, the second voltage input terminal receives a first scan voltage for controlling the turn-off of the thin film transistor, and the voltage output terminal outputs a regenerative scan voltage, wherein the regenerative scan voltage is formed by superimposing an AC component of the feedback common voltage and the first scan voltage.
  • the blocking element is a capacitor.
  • the liquid crystal display further includes a scan driver, and the scan driver receives the regenerated scan voltage and a second scan voltage for controlling the turn-on of the thin film transistor, and sequentially outputs a plurality of scan signals to each of the scan lines according to the two scan voltages.
  • liquid crystal display further comprises a scan voltage generator, and the scan voltage generator supplies the first scan voltage and the second scan voltage.
  • the liquid crystal display further comprises a data driver for applying a gray scale voltage to the data line while the thin film transistor is turned on.
  • the liquid crystal display includes a liquid crystal panel and a common voltage generator
  • the liquid crystal panel includes a plurality of pixel regions arranged in a matrix manner.
  • a thin film transistor and a storage capacitor are disposed in each pixel region
  • the storage capacitor includes a pixel electrode and a storage electrode disposed opposite to each other
  • the common voltage generator provides a common voltage driving method for the storage electrode, including: a. receiving feedback from the storage electrode a common voltage; b. generating a regenerative scan voltage based on the feedback common voltage; c. driving the thin film transistor with the regenerative scan voltage.
  • step b the alternating component of the feedback common voltage is superimposed with the first scanning voltage for controlling the thin film transistor to be cut off.
  • a scan driver receives a regenerative scan voltage and a second scan voltage for controlling the turn-on of the thin film transistor, and sequentially outputs a plurality of scan signals to each scan line according to the two scan voltages.
  • the liquid crystal display provided by the present invention and the driving method thereof use the scan voltage regenerator to generate a regenerative scan voltage for driving the thin film transistor according to the feedback common voltage, to compensate for the fluctuation of the common voltage, Thereby solving the prior art due to the change of the scanning voltage
  • FIG. 1 is a schematic view showing the circuit structure of a liquid crystal display of the prior art.
  • FIG. 2 is a schematic view showing the circuit structure of a first embodiment of a liquid crystal display of the present invention.
  • Fig. 3 is a circuit configuration diagram of a scanning voltage regenerator in the first embodiment of the liquid crystal display of the present invention.
  • FIG. 4 is a flow chart showing a driving method of the first embodiment of the liquid crystal display of the present invention. ⁇ detailed description ⁇
  • FIG. 2 is a schematic diagram showing the circuit structure of the first embodiment of the liquid crystal display of the present invention.
  • the liquid crystal display 20 of the present embodiment includes a liquid crystal panel 21, a scan voltage generator 22, a scan driver 23, a data driver 24, a common voltage generator 25, and a scan voltage regenerator 26.
  • the liquid crystal panel 21 includes a plurality of scanning lines 231 and a plurality of data lines 241.
  • the scan lines 231 and the data lines 241 are disposed in an insulated manner to define a plurality of pixel regions 202 arranged in a matrix.
  • a thin film transistor 203, a liquid crystal capacitor 204, and a storage capacitor 205 are disposed in each of the pixel regions 202.
  • the liquid crystal capacitor 204 includes a pixel electrode 2041, a common electrode 2042, and a liquid crystal layer (not shown) sandwiched therebetween.
  • the storage capacitor 205 includes a pixel electrode 2041 disposed oppositely, a storage electrode 2051, and an insulating material (not shown) sandwiched therebetween.
  • the thin film transistor 203 includes a gate (not labeled), a source (not labeled), and a drain (not labeled), wherein the gate is connected to the scan line 231, the source is connected to the data line 241, and the drain is connected. Above image Element electrode 2041. A parasitic capacitance 206 exists between the source and the drain of the thin film transistor 203.
  • the scan voltage generator 22 supplies a first scan voltage VGL for controlling the turn-off of the thin film transistor 203 and a second scan voltage VGH for controlling the turn-on of the thin film transistor 203.
  • the common voltage generator 25 supplies a common voltage VCOM to the above-described common electrode 2042 and the above-described storage electrode 2051.
  • the liquid crystal display 20 of the present invention further includes a scan voltage regenerator 26 as compared with the prior art liquid crystal display 10 shown in FIG.
  • the scan voltage regenerator 26 is connected to the storage electrode 2051 in each of the pixel regions 202 through the feedback line 261 to receive the feedback common voltage VCOM' from the storage electrode 2051, and generates a regeneration for driving the thin film transistor 203 according to the feedback common voltage VCOM.
  • Scan voltage VGL' Scan voltage VGL'.
  • the scan driver 13 receives the above-described regenerative scan voltage VGL' and the second scan voltage VGH, and sequentially outputs a plurality of scan signals to each of the scan lines in accordance with the two scan voltages VGL, VGH.
  • FIG. 3 is a schematic diagram showing the circuit structure of the scanning voltage regenerator 26 in the first embodiment of the liquid crystal display of the present invention.
  • the scan voltage regenerator 26 includes an adder 262 and a blocking element 263.
  • the adder 262 includes a first voltage input terminal 2621, a second voltage input terminal 2622, and a voltage output terminal 2623.
  • the first voltage input 2621 receives the feedback common voltage VCOM via the blocking element 263.
  • the blocking element 263 is configured to filter out the DC component of the feedback common voltage VCOM, and input the AC component VCOM of the feedback common voltage VCOM to the first voltage input terminal 2621.
  • the blocking element 263 is a capacitor. In other embodiments, the blocking element 263 can also be implemented by other elements or circuits that can perform the same function.
  • the second voltage input terminal 2622 receives a first scan voltage VGL for controlling the turn-off of the thin film transistor 203, and the voltage output terminal 2623 outputs a regenerative scan voltage VGL'.
  • the regenerative scanning voltage VGL' is formed by superimposing the AC component VCOM" of the feedback common voltage VCOM with the first scanning voltage VGL, and the specific formula is as follows:
  • VGU VCOM"+VGL (1)
  • the scan driver 23 receives the regenerative scan voltage VGL, and selectively applies the regenerated scan voltage VGL to the scan line 231, thereby controlling the corresponding thin film transistor 203 to be turned off. This In addition, the scan driver 23 further receives the second scan voltage VGH, and selectively applies the second scan voltage VGH to the scan line 231, thereby controlling the corresponding thin film transistor 203 to be turned on.
  • the data driver 24 applies a gray scale voltage to the corresponding data line 241 to load the gray scale voltage to the pixel electrode 2041 via the source and drain of the turned-on thin film transistor 203.
  • the selective application mode of the regenerative scan voltage VGL and the second scan voltage VGH and the manner of applying the gray scale voltage are common knowledge in the art, and will not be described herein.
  • the scan voltage regenerator 26 can adjust the first scan voltage VGL according to the change of the feedback common voltage VCOM (ie, the AC component VCOM), thereby generating the regenerative scan voltage VGL', so that the regeneration applied to the gate of the thin film transistor 203 is performed.
  • only one scanning voltage regenerator 26 is disposed in the liquid crystal display 20, and is connected to the storage electrode 2051 in all the pixel regions 202 in the liquid crystal panel 21. Further, the feedback common voltage VCOM is received from all of the storage electrodes 2051.
  • a plurality of scan voltage regenerators 26 may also be provided. For example, a scan voltage regenerator 26 is provided for each row of pixel regions 202 or other predetermined number of pixel regions 202, which is not specifically limited by the present invention.
  • FIG. 4 is a flow chart of a driving method of the first embodiment of the liquid crystal display of the present invention. As shown in FIG. 4, the driving method of this embodiment includes the following steps:
  • Step 301 receiving a feedback common voltage VCOM from the storage electrode 2051.
  • Step 302 generating a regenerative scan voltage VGL according to the feedback common voltage VCOM.
  • the regenerative scan voltage VGL may be generated by superimposing the AC component VCOM of the feedback common voltage VCOM with the first scan voltage VGL for controlling the turn-off of the thin film transistor 203.
  • Step 303 driving the thin film transistor 203 by using the regenerative scan voltage VGL.
  • the above steps 301 and 302 are performed by the scan voltage regenerator 26 described above in connection with FIG. 2, and the step 303 is performed by the scan driver 23 described above in connection with FIG. 2, and the related technical details of the above steps can be referred to The detailed descriptions of the various modules are therefore not described here.
  • the liquid crystal display and the driving method thereof disclosed by the present invention use a scan voltage regenerator to generate a regenerative scan voltage for driving a thin film transistor according to a feedback common voltage to compensate for fluctuation of a common voltage, thereby solving the prior art.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
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Description

液晶显示器及其驱动方法
【技术领域】
本发明涉及液晶显示技术领域， 特别是涉及一种液晶显示器及其驱动方法。 【背景技术】
目前， 液晶显示装置凭借轻薄、 省电、 低辐射等优点， 已广泛应用于 电脑显示器、 电视机、 笔记本电脑、 移动电话、 数码相机等各种电子产品。
请参阅图 1 , 图 1是一种现有技术的液晶显示器的电路结构示意图。 如图 1所示， 该液晶显示器 10包括一液晶面板 11、 一扫描电压产生器 12、 一扫描驱动器 13、 一数据驱动器 14以及一公共电压产生器 15。 其中， 扫 描驱动器 13和数据驱动器 14用于驱动液晶面板 11 , 公共电压产生器 15 用于为液晶面板 11提供一公共电压 VCOM, 扫描电压产生器 12用于为扫 描驱动器 13提供一第一扫描电压 VGL和一第二扫描电压 VGH。
液晶面板 11 包括多条相互平行的扫描线 131、 多条相互平行且与扫 描线 131以绝缘方式交叉设置的数据线 141。 扫描线 131与数据线 141定 义出多个像素区 102。
每一像素区 102内设置有一位于扫描线 131与数据线 141相交处的薄 膜晶体管 103、 一液晶电容 104以及一存储电容 105。
其中， 液晶电容 104由像素电极 1041、 公共电极 1042以及夹在二者 之间的液晶层（图未示）构成。存储电容 105由像素电极 1041、存储电极 1051 以及夹在二者之间的绝缘材料（图未示）构成。
薄膜晶体管 103的栅极（未标号）连接到扫描线 131 ,源极（未标号）连接 到数据线 141 , 漏极（未标号）连接到像素电极 1041。
扫描电压产生器 12提供第一扫描电压 VGL和第二扫描电压 VGH至 扫描驱动器 13 , 扫描驱动器 13根据两个扫描电压 VGL和 VGH依序输出 多个扫描信号到每一条扫描线。在扫描驱动 13输出扫描信号到一行扫描线 131 时， 该行扫描线 131连接的薄膜晶体管 103导通， 同时， 数据驱动器 14提供多个灰阶电压到多条数据线 141 , 以使灰阶电压经由导通的薄膜晶 体管 103的源极和漏极加载到像素电极 1041。 和公共电极 1042, 因此， 在灰阶电压经由导通的薄膜晶体管 103的源极和 漏极加载到像素电极 1041后， 由于液晶电容 104上存在公共电压 VCOM 与灰阶电压的电压差， 使得其间的液晶发生偏转， 从而根据液晶偏转的角 度显示需要的灰阶。存储电容 105的作用是维持像素电极 1041上的灰阶电 压， 以使像素电极 1041上的灰阶电压保持至下一灰阶电压到来。
然而， 薄膜晶体管 103的栅极和漏极之间一般存在寄生电容 106 , 当 薄膜晶体管 103的栅极上的电压发生跳变（如从第二扫描电压 VGH跳变至 第一扫描电压 VGL), 由于寄生电容 106上的电压不能瞬间变化， 因此像素 电极 1041上的电压也会发生相应跳变。同时又由于存储电容 105和液晶电 容 104上的电压不能瞬间变化， 因此造成存储电极 1051和公共电极 1042 上的公共电压 VCOM发生飘动， 进而容易导致显示画面的闪烁。
因此， 亟需提供一种液晶显示器及其驱动方法， 以解决现有液晶显示 器中由于扫描电压变化引起的公共电压飘动所导致的显示画面闪烁问题。
【发明内容】
本发明主要解决的技术问题是提供一种液晶显示器及其驱动方法， 以解决 烁问题。
为解决上述技术问题， 本发明采用的一个技术方案是： 提供一种液晶显示 器， 液晶显示器包括一液晶面板、 一扫描驱动器以及一公共电压产生器， 液晶 面板包括多条扫描线及多条数据线， 多条扫描线与多条数据线以绝缘方式交叉 设置， 以定义按矩阵方式排列的多个像素区， 每一像素区内设置有一薄膜晶体 管以及一存储电容， 存储电容包括相对设置的一像素电极和一存储电极， 薄膜 晶体管包括一栅极、 一源极以及一漏极， 栅极连接一扫描线， 源极连接一数据 线， 漏极连接像素电极， 公共电压产生器为存储电极提供公共电压， 其特征在 于， 液晶显示器进一步包括一扫描电压再生器， 扫描电压再生器包括一加法器 和一电容， 加法器包括一第一电压输入端、 一第二电压输入端以及一电压输出 端， 第一电压输入端经由电容从存储电极接收反馈公共电压， 第二电压输入端 接收用于控制薄膜晶体管截止的一第一扫描电压， 电压输出端输出再生扫描电 压， 扫描驱动器接收再生扫描电压和用于控制薄膜晶体管导通的一第二扫描电 压， 并根据再生扫描电压和第二扫描电压依序输出多个扫描信号到每一条扫描 线。
为解决上述技术问题， 本发明采用的另一个技术方案是： 提供一种液晶显 示器， 液晶显示器包括一液晶面板以及一公共电压产生器， 液晶面板包括按矩 阵方式排列的多个像素区， 每一像素区内设置有一薄膜晶体管以及一存储电容， 存储电容包括相对设置的像素电极和存储电极， 公共电压产生器为存储电极提 供公共电压， 液晶面板进一步包括一扫描电压再生器， 扫描电压再生器从存储 电极接收反馈公共电压， 并根据反馈公共电压生成用于驱动薄膜晶体管的再生 扫描电压。
其中， 液晶面板包括多条扫描线及多条数据线， 多条扫描线与多条数据线 以绝缘方式交叉设置， 以定义像素区， 薄膜晶体管包括一栅极、 一源极以及一 漏极， 其中栅极连接一扫描线， 源极连接一数据线， 漏极连接像素电极。
其中， 扫描电压再生器包括一加法器和一隔直元件， 其中加法器包括一第 一电压输入端、 一第二电压输入端以及一电压输出端， 第一电压输入端经由隔 直元件接收反馈公共电压， 第二电压输入端接收用于控制薄膜晶体管截止的一 第一扫描电压， 电压输出端输出再生扫描电压， 再生扫描电压由反馈公共电压 的交流分量与第一扫描电压叠加而成。 其中， 隔直元件为电容。
其中， 液晶显示器进一步包括扫描驱动器， 扫描驱动器接收再生扫描电压 和用于控制薄膜晶体管导通的一第二扫描电压， 并根据上述两个扫描电压依序 输出多个扫描信号到每一条扫描线。
其中， 液晶显示器进一步包括扫描电压产生器， 扫描电压产生器提供第一 扫描电压和第二扫描电压。
其中， 液晶显示器进一步包括一数据驱动器， 数据驱动器用于在薄膜晶体 管导通的同时施加灰阶电压到数据线上。
为解决上述技术问题， 本发明采用的另一个技术方案是： 提供一种液晶显 示器的驱动方法， 液晶显示器包括一液晶面板以及一公共电压产生器， 液晶面 板包括按矩阵方式排列的多个像素区， 每一像素区内设置有一薄膜晶体管以及 一存储电容， 存储电容包括相对设置的一像素电极和一存储电极， 公共电压产 生器为存储电极提供公共电压驱动方法包括： a.从存储电极接收反馈公共电压； b. 根据反馈公共电压生成再生扫描电压； c. 利用再生扫描电压驱动薄膜晶体 管。
其中， 在步骤 b 中， 将反馈公共电压的交流分量与用于控制薄膜晶体管截 止的第一扫描电压相叠加。
其中， 在步骤 c 中， 一扫描驱动器接收再生扫描电压和用于控制薄膜晶体 管导通的一第二扫描电压， 并根据上述两个扫描电压依序输出多个扫描信号到 每一条扫描线， 以驱动薄膜晶体管。
本发明的有益效果是： 区别于现有技术， 本发明提供的液晶显示器及其驱 动方法利用扫描电压再生器根据反馈公共电压生成用于驱动薄膜晶体管的再生 扫描电压， 以补偿公共电压的飘动， 从而解决现有技术中由于扫描电压变化引
【附图说明】 为了更清楚地说明本发明实施例中的技术方案， 下面将对实施例描述中所 需要使用的附图作筒单地介绍， 显而易见地， 下面描述中的附图仅仅是本发明 的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以根据这些附图获得其他的附图。 其中：
图 1是一种现有技术的液晶显示器的电路结构示意图。
图 2是本发明液晶显示器的第一实施例的电路结构示意图。
图 3是本发明液晶显示器的第一实施例中的扫描电压再生器的电路结构示 意图。
图 4是本发明液晶显示器的第一实施例的驱动方法的流程图。 【具体实施方式】
为了使本发明的目的、 技术方案及优点更加清楚明白， 以下结合附图及实 施例， 对本发明进行进一步详细说明。 应当理解， 此处所描述的具体实施例仅 仅用以解释本发明， 并不用于限定本发明。
请参阅图 2, 图 2是本发明液晶显示器的第一实施例的电路结构示意图。 如 图 2所示， 本实施例的液晶显示器 20 包括一液晶面板 21、 一扫描电压产生器 22、 一扫描驱动器 23、 一数据驱动器 24、 一公共电压产生器 25 以及一扫描电 压再生器 26。
液晶面板 21包括多条扫描线 231及多条数据线 241。 扫描线 231与数据线 241以绝缘方式交叉设置， 进而定义出按矩阵方式排列的多个像素区 202。 每一 像素区 202内设置有一薄膜晶体管 203、 一液晶电容 204以及一存储电容 205。
液晶电容 204包括相对设置的一像素电极 2041、一公共电极 2042以及夹在 二者之间的液晶层 (图未示）。存储电容 205包括相对设置的像素电极 2041、一存 储电极 2051以及夹在二者之间的绝缘材料 (图未示）。
薄膜晶体管 203包括一栅极 (未标号）、 一源极 (未标号)以及一漏极 (未标号）， 其中栅极连接一上述扫描线 231 , 源极连接一上述数据线 241 , 漏极连接上述像 素电极 2041。 薄膜晶体管 203的源极与漏极之间存在一寄生电容 206。 扫描电压产生器 22提供用于控制薄膜晶体管 203截止的第一扫描电压 VGL 和用于控制薄膜晶体管 203导通的第二扫描电压 VGH。公共电压产生器 25提供 公共电压 VCOM到上述公共电极 2042和上述存储电极 2051。
与图 1所示的现有技术的液晶显示器 10相比， 本发明的液晶显示器 20进 一步包括一扫描电压再生器 26。扫描电压再生器 26通过反馈线 261与每一个像 素区 202 中的存储电极 2051 连接， 以从存储电极 2051 接收反馈公共电压 VCOM' ,并根据反馈公共电压 VCOM，生成用于驱动薄膜晶体管 203的再生扫描 电压 VGL'。 扫描驱动器 13接收上述再生扫描电压 VGL'和第二扫描电压 VGH, 并根据上述两个扫描电压 VGL，、 VGH依序输出多个扫描信号到每一条扫描线。
具体来说， 请参阅图 3, 图 3是本发明液晶显示器的第一实施例中的扫描电 压再生器 26的电路结构示意图。 如图 3所示， 扫描电压再生器 26包括一加法 器 262和一隔直元件 263。 上述加法器 262包括一第一电压输入端 2621、 一第 二电压输入端 2622以及一电压输出端 2623。
第一电压输入端 2621经由隔直元件 263接收反馈公共电压 VCOM，。 隔直 元件 263 用于过滤掉反馈公共电压 VCOM，的直流分量， 并将反馈公共电压 VCOM，的交流分量 VCOM"输入到第一电压输入端 2621。 在本实施例中， 隔直 元件 263为电容。 在其他实施例中， 隔直元件 263也可以由能够实现相同功能 的其他元件或电路实现。
第二电压输入端 2622接收用于控制薄膜晶体管 203 截止的第一扫描电压 VGL, 电压输出端 2623输出再生扫描电压 VGL'。 再生扫描电压 VGL'由反馈公 共电压 VCOM，的交流分量 VCOM"与第一扫描电压 VGL叠加而成， 其具体公 式如下：
VGU = VCOM"+VGL (1)
请继续参阅图 2,扫描驱动器 23接收再生扫描电压 VGL，， 并将再生扫描电 压 VGL，选择性施加到扫描线 231上， 进而控制对应的薄膜晶体管 203截止。 此 外， 扫描驱动器 23进一步接收第二扫描电压 VGH, 并将第二扫描电压 VGH选 择性施加到扫描线 231上， 进而控制对应的薄膜晶体管 203导通。
在上述薄膜晶体管 203导通的同时， 数据驱动器 24施加灰阶电压到对应的 数据线 241上， 以使灰阶电压经由导通的薄膜晶体管 203的源极和漏极加载到 像素电极 2041。 在本实施例中， 再生扫描电压 VGL，和第二扫描电压 VGH的选 择性施加方式以及灰阶电压的施加方式为本领域公知常识， 在此不再赘述。
通过上述方式， 当薄膜晶体管 203的栅极上的扫描电压发生跳变 (例如， 从 第二扫描电压 VGH跳变到第一扫描电压 VGL)时， 由于寄生电容 206、 存储电 容 205以及液晶电容 204的存在而使得存储电极 2051和公共电极 2042上的公 共电压 VCOM产生飘动。扫描电压再生器 26可 ^据反馈公共电压 VCOM，的变 化 (即交流分量 VCOM")相应调整第一扫描电压 VGL, 进而产生再生扫描电压 VGL' , 使得施加到薄膜晶体管 203 的栅极上的再生扫描电压 VGL，与存储电极
值得注意的是， 本发明的第一实施例中， 在液晶显示器 20中仅设置了一个 扫描电压再生器 26, 并使其与液晶面板 21 中的全部像素区 202 中的存储电极 2051相连接， 进而从全部存储电极 2051接收反馈公共电压 VCOM，。 但， 在本 发明的其他实施例中， 也可以设置多个扫描电压再生器 26。 例如， 针对每行像 素区 202或者其他预定数量的像素区 202设置一个扫描电压再生器 26, 本发明 对此不作具体限定。
请参阅图 4, 图 4是本发明液晶显示器的第一实施例的驱动方法的流程图。 如图 4所示， 本实施例的驱动方法包括以下步骤：
步骤 301 , 从存储电极 2051接收反馈公共电压 VCOM，。
步骤 302,根据反馈公共电压 VCOM，生成再生扫描电压 VGL，。在优选实施 方式中， 可将反馈公共电压 VCOM，的交流分量 VCOM"与用于控制薄膜晶体管 203截止的第一扫描电压 VGL相叠加来生成再生扫描电压 VGL，。 步骤 303 , 利用再生扫描电压 VGL，驱动薄膜晶体管 203。
其中， 以上步骤 301和 302由上文结合图 2所描述的扫描电压再生器 26执 行， 步骤 303由上文结合图 2所描述的扫描驱动器 23执行， 以上步骤的相关技 术细节可参阅上文中对各个模块所作出的详细描述， 因此于此不再赘述。
因此， 通过上述技术方案， 本发明所揭示的液晶显示器及其驱动方法利用 扫描电压再生器根据反馈公共电压生成用于驱动薄膜晶体管的再生扫描电压， 以补偿公共电压的飘动， 从而解决现有技术中由于扫描电压变化引起的公共电 压飘动所导致的显示画面闪烁问题。
以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在本发 明的精神和原则之内所作的任何修改、 等同替换和改进等， 均应包含在本发明 的保护范围之内。

Claims

权利要求
1. 一种液晶显示器， 所述液晶显示器包括一液晶面板、 一扫描驱动器以及 一公共电压产生器， 所述液晶面板包括多条扫描线及多条数据线， 所述多条扫 描线与所述多条数据线以绝缘方式交叉设置， 以定义按矩阵方式排列的多个像 素区， 每一所述像素区内设置有一薄膜晶体管以及一存储电容， 所述存储电容 包括相对设置的一像素电极和一存储电极， 所述薄膜晶体管包括一栅极、 一源 极以及一漏极， 所述栅极连接一所述扫描线， 所述源极连接一所述数据线， 所 其特征在于， 所述液晶显示器进一步包括一扫描电压再生器， 所述扫描电压再 生器包括一加法器和一电容， 所述加法器包括一第一电压输入端、 一第二电压 输入端以及一电压输出端， 所述第一电压输入端经由所述电容从所述存储电极 接收反馈公共电压， 所述第二电压输入端接收用于控制所述薄膜晶体管截止的 一第一扫描电压， 所述电压输出端输出再生扫描电压， 所述扫描驱动器接收所 述再生扫描电压和用于控制所述薄膜晶体管导通的一第二扫描电压， 并根据所 述再生扫描电压和所述第二扫描电压依序输出多个扫描信号到每一条扫描线。
2. 一种液晶显示器， 所述液晶显示器包括一液晶面板以及一公共电压产生 器， 所述液晶面板包括按矩阵方式排列的多个像素区， 每一所述像素区内设置 有一薄膜晶体管以及一存储电容， 所述存储电容包括相对设置的一像素电极和 所述液晶显示器进一步包括一扫描电压再生器， 所述扫描电压再生器从所述存 储电极接收反馈公共电压， 并根据所述反馈公共电压生成用于驱动所述薄膜晶 体管的再生扫描电压。
3. 根据权利要求 2所述的液晶显示器， 其特征在于， 所述液晶面板包括多 条扫描线及多条数据线， 所述多条扫描线与所述多条数据线以绝缘方式交叉设 置， 以定义所述像素区， 所述薄膜晶体管包括一栅极、 一源极以及一漏极， 其 中所述栅极连接一所述扫描线， 所述源极连接一所述数据线， 所述漏极连接所 述像素电极。
4. 根据权利要求 3所述的液晶显示器， 其特征在于， 所述扫描电压再生器 包括一加法器和一隔直元件， 其中所述加法器包括一第一电压输入端、 一第二 电压输入端以及一电压输出端， 所述第一电压输入端经由所述隔直元件接收所 述反馈公共电压， 所述第二电压输入端接收用于控制所述薄膜晶体管截止的一 第一扫描电压， 所述电压输出端输出所述再生扫描电压， 所述再生扫描电压由 所述反馈公共电压的交流分量与所述第一扫描电压叠加而成。
5. 根据权利要求 4所述的液晶显示器， 其特征在于， 所述隔直元件为电容。
6. 根据权利要求 4所述的液晶显示器， 其特征在于， 所述液晶显示器进一 步包括一扫描驱动器， 所述扫描驱动器接收所述再生扫描电压和用于控制所述 薄膜晶体管导通的一第二扫描电压， 并根据上述两个扫描电压依序输出多个扫 描信号到每一条扫描线。
7. 根据权利要求 6所述的液晶显示器， 其特征在于， 所述液晶显示器进一 步包括扫描电压产生器， 所述扫描电压产生器提供所述第一扫描电压和第二扫 描电压。
8. 根据权利要求 4所述的液晶显示器， 其特征在于， 所述液晶显示器进一 步包括一数据驱动器， 所述数据驱动器用于在所述薄膜晶体管导通的同时施加 灰阶电压到所述数据线上。
9. 一种液晶显示器的驱动方法， 所述液晶显示器包括一液晶面板以及一公 共电压产生器， 所述液晶面板包括按矩阵方式排列的多个像素区， 每一所述像 素区内设置有一薄膜晶体管以及一存储电容， 所述存储电容包括相对设置的一 其特征在于， 所述驱动方法包括： a. 从所述存储电极接收反馈公共电压； b. 根 据所述反馈公共电压生成再生扫描电压； c. 利用所述再生扫描电压驱动所述薄 膜晶体管。
10. 根据权利要求 9所述的驱动方法， 其特征在于， 在所述步骤 b中， 将所 述反馈公共电压的交流分量与用于控制所述薄膜晶体管截止的第一扫描电压相 叠力口。
11. 根据权利要求 10所述的驱动方法， 其特征在于： 在所述步骤 c中， 一 扫描驱动器接收所述再生扫描电压和用于控制所述薄膜晶体管导通的一第二扫 描电压， 并根据上述两个扫描电压依序输出多个扫描信号到每一条扫描线， 以 驱动所述薄膜晶体管。
PCT/CN2011/073714 2011-04-14 2011-05-05 液晶显示器及其驱动方法 WO2012139312A1 (zh)

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