WO2012151761A1 - 液晶显示器 - Google Patents

液晶显示器 Download PDF

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Publication number
WO2012151761A1
WO2012151761A1 PCT/CN2011/074349 CN2011074349W WO2012151761A1 WO 2012151761 A1 WO2012151761 A1 WO 2012151761A1 CN 2011074349 W CN2011074349 W CN 2011074349W WO 2012151761 A1 WO2012151761 A1 WO 2012151761A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
crystal display
pixel
electrode
capacitor
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PCT/CN2011/074349
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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 EP11865403.7A priority Critical patent/EP2706397B1/de
Priority to US13/145,909 priority patent/US8576149B2/en
Publication of WO2012151761A1 publication Critical patent/WO2012151761A1/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
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G09G3/3666—Control of matrices with row and column drivers using an active matrix with the matrix divided into sections
    • 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
    • G09G2300/043—Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0852—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor being a dynamic memory with more than one capacitor
    • 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
    • G09G2320/0209—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 display.
  • Liquid crystal display (Liquid Crystal Display, LCD) is a widely used flat panel display, which has the advantages of slim shape, power saving and no radiation.
  • the working principle of the liquid crystal display is to change the arrangement state of the liquid crystal molecules in the liquid crystal layer by using the voltage difference between the liquid crystal layers to change the light transmittance of the liquid crystal layer, and then cooperate with the light source provided by the backlight module to display the image.
  • FIG. 1 is a schematic diagram of a circuit structure of a conventional liquid crystal display.
  • the liquid crystal display includes a liquid crystal panel 110, a common voltage generator 15, a scan driver 17, and a data driver 16.
  • the liquid crystal panel 110 includes a plurality of scanning lines 9 and a plurality of data lines 14.
  • the scanning lines 9 and the data lines 14 are disposed in an insulated manner to define a plurality of pixel units 100 arranged in a matrix.
  • a thin film transistor 10, a liquid crystal capacitor 12 and a storage capacitor 13 are disposed in each pixel unit 100.
  • the liquid crystal capacitor 12 includes a pixel electrode 121, a common electrode 122, and a liquid crystal layer (not shown) sandwiched therebetween.
  • the storage capacitor 13 includes a pixel electrode 121 disposed opposite to each other, a storage electrode 132, and an insulating material (not shown) sandwiched therebetween. Further, the above-described data line 14, the common electrode 122, and the liquid crystal layer therebetween generally form a parasitic capacitance 11.
  • the thin film transistor 10 includes a gate, a source, and a drain, wherein the gate is connected to the scan line 9, the source is connected to the data line 14, and the drain is connected to the pixel electrode 121.
  • the scan driver 17 is configured to sequentially output a plurality of scan signals to each scan line 9.
  • the scan driver 17 outputs a scan signal to a row of scan lines 9
  • the thin film transistor 10 connected to the row of scan lines 9 is turned on, and at the same time, the data driver A plurality of gray scale voltages are supplied to the plurality of data lines 14 to load the gray scale voltages to the pixel electrodes 121 via the source and drain of the turned-on thin film transistor 10.
  • the common voltage generator 15 is for supplying a common voltage Vcom to the above-described common electrode 122 and the above-described storage electrode 132. Therefore, after the gray scale voltage is applied to the pixel electrode 121 via the source and the drain of the turned-on thin film transistor 10, since the voltage difference between the common voltage and the gray scale voltage exists on the liquid crystal capacitor 12, the liquid crystal therebetween is deflected, thereby The desired gray level is displayed according to the angle at which the liquid crystal is deflected.
  • the function of the storage capacitor 13 is to maintain the gray scale voltage on the pixel electrode 121 so that the gray scale voltage on the pixel electrode 121 is maintained until the next gray scale voltage comes.
  • FIG. 2 is an arrangement diagram of a pixel unit 100 of an exemplary area of the liquid crystal display.
  • the above area is a 3*3 pixel area
  • the middle pixel unit 100 is denoted by A
  • the surrounding pixel unit 100 is denoted by B.
  • the gray scale voltage supplied on the data line 14 of the pixel unit B is bound to change.
  • the voltage of the common electrode 122 of the pixel unit B fluctuates.
  • the common electrode 122 of each pixel unit is in communication, and thus the voltage of the common electrode 122 of the above-described pixel unit A also fluctuates.
  • the main object of the present invention is to provide a liquid crystal display that reduces cross noise and improves the display quality of the liquid crystal display.
  • the present invention provides a liquid crystal display comprising a liquid crystal panel comprising a plurality of pixel units arranged in a matrix, each of the pixel units being provided with a liquid crystal capacitor, wherein the liquid crystal capacitor comprises a relatively disposed one a pixel electrode and a common electrode, the liquid crystal display further comprising a pixel voltage regulator, the pixel voltage regulator comprising a plurality of compensation capacitors and a unity gain amplifier, wherein each of the pixel units is provided with a compensation capacitor, the compensation capacitor
  • the first pixel electrode and the feedback common electrode are disposed opposite to each other, the input end of the unit gain amplifier is connected to the common electrode, and the output end is connected to the feedback common electrode.
  • 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 the pixel unit, and each of the pixel units includes a a thin film transistor including 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.
  • each of the pixel units further includes a storage capacitor
  • the storage capacitor includes a plurality of pixel electrodes and a storage electrode disposed opposite to each other, and the storage electrode and the common electrode receive the same common voltage.
  • the above liquid crystal display further includes a common voltage generator for supplying a common voltage to the storage electrode and the common electrode.
  • the liquid crystal display further comprises a scan driver for providing a scan signal for the scan line.
  • the liquid crystal display further comprises a data driver for providing a gray scale voltage to the data line.
  • the capacitance of the compensation capacitor is twice the capacitance of the liquid crystal capacitor.
  • the liquid crystal display is a liquid crystal display having a size of less than or equal to 32 inches.
  • the present invention also provides a liquid crystal display comprising a liquid crystal panel, the liquid crystal panel comprising a plurality of pixel units arranged in a matrix, each of the pixel units being provided with a liquid crystal capacitor, wherein the liquid crystal capacitor comprises a relative arrangement a pixel electrode and a common electrode, the liquid crystal display further comprising a pixel voltage regulator, the pixel voltage regulator receiving a feedback common voltage from the common electrode, and adjusting a voltage of the pixel electrode according to the feedback common voltage .
  • each of the pixel units further includes a storage capacitor
  • the storage capacitor includes a plurality of pixel electrodes and a storage electrode disposed opposite to each other, and the storage electrode and the common electrode receive the same common voltage.
  • the pixel voltage regulator comprises a plurality of compensation capacitors and two unity gain amplifiers, each of the pixel units is provided with a compensation capacitor, wherein the compensation capacitor comprises a plurality of pixel electrodes and a feedback common electrode, and a liquid crystal
  • the display comprises two parts symmetrical vertically, wherein an input end of a unity gain amplifier is connected to a common electrode of each pixel unit of the upper half, and an output end is connected to a feedback common electrode of a compensation capacitor in each pixel unit of the upper half, and The input end of a unity gain amplifier is connected to the common electrode of each pixel unit of the lower half, and the output end is connected to the feedback common electrode of the compensation capacitor in each pixel unit of the lower half.
  • 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 the pixel unit, and each of the pixel units includes a a thin film transistor including 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 above liquid crystal display further includes a common voltage generator for supplying a common voltage to the storage electrode and the common electrode.
  • the liquid crystal display further comprises a scan driver for providing a scan signal for the scan line.
  • the liquid crystal display further comprises a data driver for providing a gray scale voltage to the data line.
  • the capacitance of the compensation capacitor is twice the capacitance of the liquid crystal capacitor.
  • the liquid crystal display is a liquid crystal display having a size larger than 32 inches.
  • the size of the liquid crystal display is 37 inches or 40 inches.
  • the liquid crystal display of the present invention further includes a pixel voltage regulator.
  • the pixel voltage regulator may receive a feedback common voltage from the common electrode, and adjust a voltage of the pixel electrode according to the feedback common voltage to keep a voltage of the pixel electrode and a common voltage synchronously change, thereby compensating the common voltage Vcom Fluttering, effectively improving the cross noise phenomenon and improving the display quality of the liquid crystal display.
  • FIG. 1 is a schematic diagram of a circuit structure of a prior art liquid crystal display.
  • FIG. 2 is a diagram showing the arrangement of pixel units of an exemplary area of the liquid crystal display shown in FIG. 1.
  • FIG 3 is a schematic view showing the circuit structure of a first embodiment of a liquid crystal display according to the present invention.
  • FIG. 4 is a schematic view showing the circuit structure of a second embodiment of the liquid crystal display of the present invention.
  • the liquid crystal display includes a liquid crystal panel 210, a common voltage generator 25, a pixel voltage regulator, a scan driver 27, and a data driver 26. .
  • the pixel voltage regulator described above includes a plurality of compensation capacitors 28 and a unity gain amplifier 29.
  • the above liquid crystal display may be a liquid crystal display having a size of less than or equal to 32 inches.
  • the liquid crystal panel 210 includes a plurality of scanning lines 30 and a plurality of data lines 24.
  • the scan lines 30 and the data lines 24 are alternately disposed in an insulated manner to define a plurality of pixel units 200 arranged in a matrix.
  • a thin film transistor 20, a liquid crystal capacitor 22, a storage capacitor 23 and a compensation capacitor 28 are disposed in each pixel unit 200.
  • the liquid crystal capacitor 22 includes a pixel electrode 221 disposed opposite to each other, a common electrode 222, and a liquid crystal layer (not shown) sandwiched therebetween.
  • the storage capacitor 23 includes a plurality of the above-mentioned pixel electrodes 221, a storage electrode 232, and an insulating material (not shown) sandwiched therebetween.
  • the compensation capacitor 28 includes a plurality of pixel electrodes 221, a feedback common electrode 282, and an insulating material (not shown) interposed therebetween. Further, the data line 24, the common electrode 222, and the liquid crystal layer therebetween generally form a parasitic capacitance 21.
  • the input terminal of the unity gain amplifier 29 described above is connected to the common electrode 222 of each of the pixel units 200 via a feedback line 31, and the output terminal is connected to the feedback common electrode 282 of the compensation capacitor 28 in each of the pixel units 200.
  • the unity gain amplifier 29 described above is for receiving the feedback common voltage VCOM' from the common electrode 222 and performing amplification of the current thrust so that the voltage of the feedback common electrode 282 of the compensation capacitor 28 is rapidly charged or discharged to the feedback common voltage VCOM'.
  • the thin film transistor 20 includes a gate, a source and a drain, wherein the gate is connected to the scan line 30, the source is connected to the data line 24, and the drain is connected to the pixel electrode 221.
  • the scan driver 27 is configured to sequentially output a plurality of scan signals to each of the scan lines 30.
  • the scan driver 27 outputs the scan signals to the one row of scan lines 30, the thin film transistors 20 connected to the row of scan lines 30 are turned on, and the data driver is simultaneously turned on.
  • a plurality of gray scale voltages are supplied to the plurality of data lines 24 to load the gray scale voltages to the pixel electrodes 221 via the sources and drains of the turned-on thin film transistors 20.
  • the common voltage generator 25 is for supplying a common voltage Vcom to the above-described common electrode 222 and the above-described storage electrode 232. Therefore, after the gray scale voltage is applied to the pixel electrode 221 via the source and the drain of the turned-on thin film transistor 20, since the voltage difference between the common voltage and the gray scale voltage exists on the liquid crystal capacitor 22, the liquid crystal therebetween is deflected, thereby The desired gray level is displayed according to the angle at which the liquid crystal is deflected.
  • the function of the storage capacitor 23 is to maintain the gray scale voltage on the pixel electrode 221 to keep the gray scale voltage on the pixel electrode 221 until the next gray scale voltage comes.
  • the capacitance value of the compensation capacitor 28 may be twice the capacitance value of the liquid crystal capacitor 22.
  • the liquid crystal display of the present invention further includes a pixel voltage regulator.
  • a pixel voltage regulator receives the feedback common voltage VCOM' from the common electrode 222, and quickly feeds back the feedback common voltage VCOM' to the feedback common electrode 282 of the compensation capacitor 28.
  • the voltage of the compensation capacitor 28 based on the pixel voltage regulator cannot be instantaneously changed, and when the voltage of the feedback common electrode 282 changes, the voltage on the pixel electrode 221 of the pixel unit 200 changes accordingly. Therefore, the voltage of the pixel electrode 221 can be kept in synchronization with the common voltage VCOM, thereby compensating for the flutter of the common voltage Vcom, effectively improving the cross noise phenomenon and improving the display quality of the liquid crystal display.
  • the liquid crystal display can be a liquid crystal display having a size larger than 32 inches, such as a 37-inch, 40-inch, or the like.
  • the liquid crystal display of the second embodiment is substantially the same as the liquid crystal display of the first embodiment, and the difference is that the pixel voltage regulator of the liquid crystal display of the second embodiment includes two unity gain amplifiers 39, and the liquid crystal display includes upper and lower symmetry. Two parts (not labeled), the upper half of the pixel unit 300 shares one unity gain amplifier 39, and the lower half of the pixel unit 300 shares the other unity gain amplifier 39.
  • the compensation capacitor 38 includes a pixel electrode 381 disposed oppositely, a feedback common electrode 382, and an insulating material (not shown) sandwiched therebetween.
  • the input terminal of one of the unity gain amplifiers 39 is connected to the common electrode 322 of each of the pixel units 300 of the upper half through the feedback line 41, and the feedback terminal is connected to the feedback capacitor 38 in each of the pixel units 300 of the upper half.
  • the input terminal of the other unity gain amplifier 39 is connected to the common electrode 322 of each of the pixel units 300 of the lower half through the feedback line 44, and the feedback terminal is connected to the feedback capacitor 38 in each of the pixel units 300 of the lower half. Electrode 382.
  • the liquid crystal display of the present invention is not limited to the first embodiment and the second embodiment, and the number of unity gain amplifiers is not limited to one or two, and may be set to more according to the increase in the size of the liquid crystal display, and the distribution position thereof may also be Set according to actual needs.

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  • Crystallography & Structural Chemistry (AREA)
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  • Computer Hardware Design (AREA)
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Description

液晶显示器
技术领域
本发明涉及到显示技术领域，特别涉及到一种液晶显示器。
背景技术
液晶显示器（Liquid Crystal Display，LCD）是目前广泛使用的一种平面显示器，其具有外形轻薄、省电以及无辐射等优点。液晶显示器的工作原理是利用液晶层两端的电压差来改变液晶层内的液晶分子的排列状态，用以改变液晶层的透光性，再配合背光模块所提供的光源以显示影像。
图1为一种现有液晶显示器的电路结构示意图。所述液晶显示器包括一液晶面板110、一公共电压产生器15、一扫描驱动器17和一数据驱动器16。液晶面板110包括多条扫描线9及多条数据线14。扫描线9与数据线14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单元100。
每一像素单元100内设置有一薄膜晶体管10、一液晶电容12和一存储电容13。 液晶电容12包括相对设置的一像素电极121、一公共电极122以及夹在二者之间的液晶层(图未示)。存储电容13包括相对设置的像素电极121、一存储电极132以及夹在二者之间的绝缘材料(图未示)。此外，上述数据线14、上述公共电极122以及二者之间的液晶层通常形成寄生电容11。
薄膜晶体管10包括一栅极、一源极以及一漏极，其中栅极连接一上述扫描线9，源极连接一上述数据线14，漏极连接上述像素电极121。
扫描驱动器17用于依序输出多个扫描信号到每一条扫描线9，在扫描驱动器17输出扫描信号到一行扫描线9时，该行扫描线9连接的薄膜晶体管10导通，同时，数据驱动器16提供多个灰阶电压到多条数据线14，以使灰阶电压经由导通的薄膜晶体管10的源极和漏极加载到像素电极121。
公共电压产生器15用于提供公共电压Vcom到上述公共电极122和上述存储电极132。因此，在灰阶电压经由导通的薄膜晶体管10的源极和漏极加载到像素电极121后，由于液晶电容12上存在公共电压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13的作用是维持像素电极121上的灰阶电压，以使像素电极121上的灰阶电压保持至下一灰阶电压到来。
请一并参阅图2，图2为液晶显示器一示例性的某一区域的像素单元100排布图。上述区域为一3*3像素区域，中间的像素单元100用A表示，周围的像素单元100用B表示。
针对某一像素单元A而言，当某一像素单元A周围的像素单元B需要显示的图像灰阶发生变化时，像素单元B的数据线14上被提供的灰阶电压势必变化。此时，由于像素单元B的寄生电容11的电压不能瞬间变化，因此像素单元B的公共电极122的电压会发生飘动。然而，每个像素单元的公共电极122是连通的，因此上述像素单元A的公共电极122的电压同样也发生飘动。举例而言，对于常亮型液晶显示器，当一显示亮态的像素单元A周围的像素单元B由亮变暗时，像素单元B的数据线14上的灰阶电压变大，由于像素单元B的寄生电容11的电压不能瞬间变化，使得像素单元B的公共电极122的电压飘高，因此上述显示亮态的像素单元A的公共电极122的电压也会飘高。反之，当显示亮态的像素单元A周围的像素单元B由暗变亮时，像素单元A的公共电极122的电压会飘低。
同理，上述液晶显示器的很多单个的像素单元100都存在公共电极122的电压飘高或飘低的问题，上面提到每个像素单元100的公共电极122是连通的，因此液晶显示器的公共电极122的整体电压存在飘高或飘低的问题，易产生交叉噪声现象，大大影响液晶显示器的显示质量。
发明内容
本发明的主要目的为提供一种液晶显示器，降低交叉噪声，提高液晶显示器的显示质量。
本发明提出一种液晶显示器，其包括一液晶面板，所述液晶面板包括按矩阵方式排列的多个像素单元，每一所述像素单元内设置有一液晶电容，所述液晶电容包括相对设置的一像素电极和一公共电极，所述液晶显示器进一步包括一像素电压调整器，所述像素电压调整器包括多个补偿电容和一单位增益放大器，每一像素单元内设置一上述补偿电容，上述补偿电容包括相对设置的一上述像素电极和一反馈公共电极，上述单位增益放大器的输入端连接所述公共电极，输出端连接所述反馈公共电极。
优选地，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，以定义所述像素单元，每一像素单元包括一薄膜晶体管，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，所述漏极连接所述像素电极。
优选地，每一像素单元进一步包括一存储电容，上述存储电容包括相对设置的一上述像素电极和一存储电极，上述存储电极和上述公共电极接收相同的公共电压。
优选地，上述液晶显示器进一步包括一公共电压产生器，上述公共电压产生器用于为存储电极和公共电极提供公共电压。
优选地，所述液晶显示器进一步包括一扫描驱动器，上述扫描驱动器用于为扫描线提供扫描信号。
优选地，所述液晶显示器进一步包括一数据驱动器，上述数据驱动器用于为数据线提供灰阶电压。
优选地，所述补偿电容的电容值为所述液晶电容的电容值的2倍。
优选地，所述液晶显示器为尺寸小于或等于32寸的液晶显示器。
本发明还提供一种液晶显示器，其包括一液晶面板，所述液晶面板包括按矩阵方式排列的多个像素单元，每一所述像素单元内设置有一液晶电容，所述液晶电容包括相对设置的一像素电极和一公共电极，所述液晶显示器进一步包括一像素电压调整器，所述像素电压调整器从所述公共电极接收反馈公共电压，并根据所述反馈公共电压调整所述像素电极的电压。
优选地，每一像素单元进一步包括一存储电容，上述存储电容包括相对设置的一上述像素电极和一存储电极，上述存储电极和上述公共电极接收相同的公共电压。
优选地，所述像素电压调整器包括多个补偿电容和两个单位增益放大器，每一像素单元内设置一上述补偿电容，上述补偿电容包括相对设置的一上述像素电极和一反馈公共电极，液晶显示器包括上下对称的两部分，其中一单位增益放大器的输入端连接上半部分的每一个像素单元的公共电极，输出端连接上半部分的每一个像素单元内的补偿电容的反馈公共电极，另一单位增益放大器的输入端连接下半部分的每一个像素单元的公共电极，输出端连接下半部分的每一个像素单元内的补偿电容的反馈公共电极。
优选地，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，以定义所述像素单元，每一像素单元包括一薄膜晶体管，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，所述漏极连接所述像素电极。
优选地，上述液晶显示器进一步包括一公共电压产生器，上述公共电压产生器用于为存储电极和公共电极提供公共电压。
优选地，所述液晶显示器进一步包括一扫描驱动器，上述扫描驱动器用于为扫描线提供扫描信号。
优选地，所述液晶显示器进一步包括一数据驱动器，上述数据驱动器用于为数据线提供灰阶电压。
优选地，所述补偿电容的电容值为所述液晶电容的电容值的2倍。
优选地，所述液晶显示器为尺寸大于32寸的液晶显示器。
优选地，所述液晶显示器的尺寸为37寸或者40寸。
相较于现有技术，本发明液晶显示器进一步包括一像素电压调整器。所述像素电压调整器可从所述公共电极接收反馈公共电压，并根据所述反馈公共电压调整所述像素电极的电压，使像素电极的电压与公共电压保持同步变化，从而补偿公共电压Vcom的飘动，有效改善交叉噪声现象，提高液晶显示器的显示质量。
附图说明
图1 为一种现有技术液晶显示器的电路结构示意图。
图2为图1所示液晶显示器一示例性的某一区域的像素单元排布图。
图3 为本发明液晶显示器第一实施例的电路结构示意图。
图4 为本发明液晶显示器第二实施例的电路结构示意图。
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
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。
参照图3，为本发明液晶显示器第一实施例的电路结构示意图，所述液晶显示器包括一液晶面板210、一公共电压产生器25、一像素电压调整器、一扫描驱动器27和一数据驱动器26。上述像素电压调整器包括多个补偿电容28和一单位增益放大器29。上述液晶显示器可为尺寸小于或等于32寸的液晶显示器。
液晶面板210包括多条扫描线30及多条数据线24。扫描线30与数据线24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单元200。每一像素单元200内设置有一薄膜晶体管20、一液晶电容22、一存储电容23和一上述补偿电容28。液晶电容22包括相对设置的一像素电极221、一公共电极222以及夹在二者之间的液晶层(图未示)。
存储电容23包括相对设置的一上述像素电极221、一存储电极232以及夹在二者之间的绝缘材料(图未示)。补偿电容28包括相对设置的一上述像素电极221、一反馈公共电极282以及夹在二者之间的绝缘材料(图未示)。此外，上述数据线24、上述公共电极222以及二者之间的液晶层通常形成寄生电容21。
上述单位增益放大器29的输入端通过反馈线31与每一个像素单元200的公共电极222连接，输出端连接到每一个像素单元200内的补偿电容28的反馈公共电极282。上述单位增益放大器29用于从公共电极222接收反馈公共电压VCOM’，并做电流推力的放大，使补偿电容28的反馈公共电极282的电压迅速充电或放电到反馈公共电压VCOM’。
薄膜晶体管20包括一栅极、一源极以及一漏极，其中栅极连接一上述扫描线30，源极连接一上述数据线24，漏极连接上述像素电极221。
扫描驱动器27用于依序输出多个扫描信号到每一条扫描线30，在扫描驱动器27输出扫描信号到一行扫描线30时，该行扫描线30连接的薄膜晶体管20导通，同时，数据驱动器26提供多个灰阶电压到多条数据线24，以使灰阶电压经由导通的薄膜晶体管20的源极和漏极加载到像素电极221。
公共电压产生器25用于提供公共电压Vcom到上述公共电极222和上述存储电极232。因此，在灰阶电压经由导通的薄膜晶体管20的源极和漏极加载到像素电极221后，由于液晶电容22上存在公共电压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23的作用是维持像素电极221上的灰阶电压，以使像素电极221上的灰阶电压保持至下一灰阶电压到来。
本实施例中，补偿电容28的电容值可为液晶电容22的电容值的2倍。
相较于现有技术，本发明液晶显示器进一步包括了一像素电压调整器。通过上述方式，当数据线24上被提供的灰阶电压发生变化时，由于寄生电容21的存在而使得存储电极232和公共电极222上的公共电压VCOM产生飘动。上述像素电压调整器的单位增益放大器29从所述公共电极222接收反馈公共电压VCOM’，并迅速将反馈公共电压VCOM’反馈至补偿电容28的反馈公共电极282。基于像素电压调整器的补偿电容28的电压不能瞬间变化，当反馈公共电极282的电压变化时，像素单元200的像素电极221上的电压随之变化。因此，像素电极221的电压可与公共电压VCOM保持同步变化，从而补偿公共电压Vcom的飘动，有效改善交叉噪声现象，提高液晶显示器的显示质量。
参照图4，为本发明液晶显示器第二实施例的电路结构示意图，该液晶显示器可为尺寸大于32寸的液晶显示器，如37寸、40寸等。第二实施例的液晶显示器与第一实施例的液晶显示器大致相同，其区别之处在于：第二实施例的液晶显示器的像素电压调整器包括两个单位增益放大器39，液晶显示器包括上下对称的两部分(未标号)，上半部分的像素单元300共用一个单位增益放大器39，下半部分的像素单元300共用另一个单位增益放大器39。
补偿电容38包括相对设置的一像素电极381、一反馈公共电极382以及夹在二者之间的绝缘材料(图未示)。其中一个单位增益放大器39的输入端通过反馈线41与上半部分的每一个像素单元300的公共电极322连接，输出端连接到上半部分的每一个像素单元300内的补偿电容38的反馈公共电极382。另一单位增益放大器39的输入端通过反馈线44与下半部分的每一个像素单元300的公共电极322连接，输出端连接到下半部分的每一个像素单元300内的补偿电容38的反馈公共电极382。
本发明液晶显示器并不限于第一实施方式和第二实施方式所述，单位增益放大器的数量不限于一个或者两个，可以根据液晶显示器尺寸的增大设置为更多个，其分布位置也可根据实际需要进行设置。
以上所述仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (18)

  1. 一种液晶显示器，其包括一液晶面板，所述液晶面板包括按矩阵方式排列的多个像素单元，每一所述像素单元内设置有一液晶电容，所述液晶电容包括相对设置的一像素电极和一公共电极，其特征在于，所述液晶显示器进一步包括一像素电压调整器，所述像素电压调整器包括多个补偿电容和一单位增益放大器，每一像素单元内设置一上述补偿电容，上述补偿电容包括相对设置的一上述像素电极和一反馈公共电极，上述单位增益放大器的输入端连接所述公共电极，输出端连接所述反馈公共电极。
  2. 根据权利要求1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，以定义所述像素单元，每一像素单元包括一薄膜晶体管，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，所述漏极连接所述像素电极。
  3. 根据权利要求2所述的液晶显示器，其特征在于，每一像素单元进一步包括一存储电容，上述存储电容包括相对设置的一上述像素电极和一存储电极，上述存储电极和上述公共电极接收相同的公共电压。
  4. 根据权利要求3所述的液晶显示器，其特征在于，上述液晶显示器进一步包括一公共电压产生器，上述公共电压产生器用于为存储电极和公共电极提供公共电压。
  5. 根据权利要求3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，上述扫描驱动器用于为扫描线提供扫描信号。
  6. 根据权利要求3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，上述数据驱动器用于为数据线提供灰阶电压。
  7. 根据权利要求1所述的液晶显示器，其特征在于，所述补偿电容的电容值为所述液晶电容的电容值的2倍。
  8. 如权利要求1所述的液晶显示器，其特征在于，所述液晶显示器为尺寸小于或等于32寸的液晶显示器。
  9. 一种液晶显示器，其包括一液晶面板，所述液晶面板包括按矩阵方式排列的多个像素单元，每一所述像素单元内设置有一液晶电容，所述液晶电容包括相对设置的一像素电极和一公共电极，其特征在于，所述液晶显示器进一步包括一像素电压调整器，所述像素电压调整器从所述公共电极接收反馈公共电压，并根据所述反馈公共电压调整所述像素电极的电压。
  10. 根据权利要求9所述的液晶显示器，其特征在于，每一像素单元进一步包括一存储电容，上述存储电容包括相对设置的一上述像素电极和一存储电极，上述存储电极和上述公共电极接收相同的公共电压。
  11. 根据权利要求10所述的液晶显示器，其特征在于，所述像素电压调整器包括多个补偿电容和两个单位增益放大器，每一像素单元内设置一上述补偿电容，上述补偿电容包括相对设置的一上述像素电极和一反馈公共电极，液晶显示器包括上下对称的两部分，其中一单位增益放大器的输入端连接上半部分的每一个像素单元的公共电极，输出端连接上半部分的每一个像素单元内的补偿电容的反馈公共电极，另一单位增益放大器的输入端连接下半部分的每一个像素单元的公共电极，输出端连接下半部分的每一个像素单元内的补偿电容的反馈公共电极。
  12. 根据权利要求11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，以定义所述像素单元，每一像素单元包括一薄膜晶体管，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，所述漏极连接所述像素电极。
  13. 根据权利要求12所述的液晶显示器，其特征在于，上述液晶显示器进一步包括一公共电压产生器，上述公共电压产生器用于为存储电极和公共电极提供公共电压。
  14. 根据权利要求12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，上述扫描驱动器用于为扫描线提供扫描信号。
  15. 根据权利要求12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，上述数据驱动器用于为数据线提供灰阶电压。
  16. 根据权利要求11所述的液晶显示器，其特征在于，所述补偿电容的电容值为所述液晶电容的电容值的2倍。
  17. 如权利要求11所述的液晶显示器，其特征在于，所述液晶显示器为尺寸大于32寸的液晶显示器。
  18. 如权利要求11所述的液晶显示器，其特征在于，所述液晶显示器的尺寸为37寸或者40寸。
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