WO2017161690A1 - 像素电极电压处理电路及显示装置 - Google Patents

像素电极电压处理电路及显示装置 Download PDF

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WO2017161690A1
WO2017161690A1 PCT/CN2016/084272 CN2016084272W WO2017161690A1 WO 2017161690 A1 WO2017161690 A1 WO 2017161690A1 CN 2016084272 W CN2016084272 W CN 2016084272W WO 2017161690 A1 WO2017161690 A1 WO 2017161690A1
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Prior art keywords
pixel electrode
electrode voltage
resistor
processing circuit
voltage
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PCT/CN2016/084272
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English (en)
French (fr)
Inventor
伏思庆
陈帅
高贤永
梁利生
徐波
肖利军
许益祯
尚飞
高少洪
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京东方科技集团股份有限公司
重庆京东方光电科技有限公司
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Priority to US15/531,374 priority Critical patent/US10192513B2/en
Publication of WO2017161690A1 publication Critical patent/WO2017161690A1/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
    • G09G3/3696—Generation of voltages supplied to electrode 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
    • G09G3/3685—Details of drivers for data electrodes
    • G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133707—Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/136204—Arrangements to prevent high voltage or static electricity failures
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/13624—Active matrix addressed cells having more than one switching element per pixel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
    • H01L2021/775—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate comprising a plurality of TFTs on a non-semiconducting substrate, e.g. driving circuits for AMLCDs

Definitions

  • the present invention relates to the field of liquid crystal display technologies, and in particular, to a pixel electrode voltage processing circuit and a display device.
  • Liquid crystal flat panel displays especially TFT-LCDs, are currently the only display devices that fully catch up with CRT even in terms of brightness, contrast, power consumption, lifetime, volume and weight. Its excellent performance, large-scale production characteristics, high degree of automation, low cost of raw materials, and broad development space have become the mainstream display products.
  • the TFT-LCD is mainly composed of a rear panel module 100, a liquid crystal layer 200, and a front panel module 300.
  • the rear panel module 100 refers to a portion behind the liquid crystal layer, and is mainly composed of a rear polarizing plate 110, a rear glass plate 120, a rear plate circuit 130, a rear alignment film 140, and the like.
  • the rear panel circuit 130 is formed on the rear glass plate and includes a gate line 131, a data line 132, a pixel electrode 133, a thin film transistor 134, and the like.
  • the front panel module 300 refers to a portion in front of the liquid crystal layer, and is mainly composed of a front alignment film 310, a common electrode 320, a color filter 330, a front glass plate 340, a front polarizer 350, and the like.
  • the front glass plate 340 is affixed with a color filter 330 and formed with a common electrode 320.
  • the liquid crystal layer 200 is sandwiched between the front and rear glass sheets.
  • each pixel unit can be structurally regarded as a liquid crystal layer sandwiched between a pixel electrode and a common electrode, and the liquid crystal layer can be equivalent to a liquid crystal capacitor C LC .
  • FIGS. 2A and 2B are a schematic structural view and an equivalent circuit diagram of a pixel unit in a TFT-LCD, respectively.
  • the gate (G-pole) of the thin film transistor 134 is connected to the gate line 131
  • the source (S-pole) is connected to the data line
  • the drain (D-pole) is connected to the pixel electrode (133).
  • the liquid crystal capacitor C LC is charged by the pixel electrodes and the common electrodes on both sides.
  • the capacitance value of the liquid crystal capacitor C LC is about 0.1 pF.
  • the liquid crystal capacitor C LC itself cannot hold the voltage until the next time the picture data is refreshed (for a normal 60 Hz picture refresh frequency, it is necessary to maintain 16 ms). Since the voltage changes, the displayed color gradation will be incorrect. Therefore, when designing the panel, a storage capacitor C s (generally formed by the traces of the pixel electrode 133 and the common electrode 320) is added. It is 0.5 pF so that the voltage of the fully charged liquid crystal capacitor C LC can be maintained until the next time the picture is updated.
  • the common electrode 320 is affected by other factors to generate some ripple voltage or peak voltage.
  • the voltage output of the pixel electrode 133 with respect to the common electrode 320 fluctuates to form a voltage difference, so that the liquid crystal rotation affects the normal output of the gray scale, thereby Some abnormalities such as crosstalk, greenish, or the occurrence of bright and dark afterimages appear.
  • the present invention provides a pixel electrode voltage processing circuit and a display device to eliminate the influence of common electrode voltage fluctuations on the charging of the liquid crystal layer.
  • a pixel electrode voltage processing circuit includes: a first input terminal IN 1 for inputting an original pixel electrode voltage; a second input terminal IN 2 for inputting a common electrode voltage; and an output terminal OUT for outputting the processed pixel electrode voltage .
  • the pixel electrode voltage processing circuit is configured to superimpose the common electrode voltage on the original pixel electrode voltage to obtain a voltage stable with respect to the common electrode voltage as the processed pixel electrode voltage.
  • a display device includes: a gate line, a data line, and a plurality of pixel units arranged in an array.
  • Each of the pixel units includes a thin film transistor, a pixel electrode, a common electrode, and the above-described pixel electrode voltage processing circuit.
  • the first input end of the pixel electrode voltage processing circuit is connected to the thin film transistor a drain, a second input connected to the common electrode, an output connected to the pixel electrode; and a gate of the thin film transistor is connected to the gate line, and a source is connected to the data line.
  • the pixel electrode voltage processing circuit and the display device of the present invention superimpose the fluctuation voltage of the common electrode on the original pixel voltage, so that the voltage outputted by the pixel electrode is stably outputted with respect to the voltage of the common electrode, thereby making the pixel
  • the gray scale is not affected by the fluctuation of the common electrode voltage, which eliminates the abnormality of the picture and maintains the normal display.
  • FIGS. 1A and 1B are respectively a schematic perspective view and a cross-sectional structural view of a prior art TFT-LCD
  • 2A and 2B are a schematic structural view and an equivalent circuit diagram of a pixel unit in a TFT-LCD
  • FIG. 3 is a circuit diagram of a pixel unit in a TFT-LCD according to a first embodiment of the present invention
  • FIG. 4 is a schematic diagram of a pixel electrode voltage processing circuit in the circuit of the pixel unit shown in FIG. 3;
  • FIG. 5 is a waveform diagram of an original pixel electrode voltage, a common electrode voltage, and a processed pixel electrode voltage in the pixel electrode power supply circuit shown in FIG. 4.
  • the invention superimposes the fluctuating voltage of the common electrode on the original pixel electrode voltage, so that the voltage outputted by the pixel electrode is stably outputted with respect to the voltage of the common electrode, so that the gray scale of the pixel display is not affected by the fluctuation of the common electrode voltage, and the picture is eliminated. Abnormal phenomenon, keeping the normal display.
  • an equivalent circuit diagram of a pixel unit in the TFT-LCD shown in FIG. 3 includes a pixel electrode voltage processing circuit, and the pixel electrode voltage processing circuit includes: a first input terminal IN 1 , and an output thereof The original pixel electrode voltage (Data Voltage); the second input terminal IN 2 , which outputs the common electrode voltage (V com Feedback); and the output terminal OUT for outputting the processed pixel electrode voltage (Data Output).
  • the pixel electrode voltage processing circuit is configured to superimpose a common electrode voltage (V com Feedback) on the original pixel electrode voltage (Data Voltage) to obtain a voltage stable with respect to the common electrode voltage as a processed pixel electrode voltage (Data Output).
  • the first input terminal IN 1 is connected to the drain (D pole) of the thin film transistor 134
  • the second input terminal IN 2 is connected to the common electrode 320
  • the output terminal of the pixel electrode voltage processing circuit OUT is connected to the pixel electrode 133.
  • the thin film transistor a large amount of technical contents are disclosed in the prior art, and the detailed description thereof will not be repeated here.
  • the liquid crystal layer can be equivalent to a liquid crystal capacitor C IC .
  • Figure 2B is similar to the pixel unit in the present embodiment, also includes storage capacitor C s, both ends thereof connected to both ends of the liquid crystal capacitor C LC, so that the voltage to the liquid crystal capacitor C LC is fully charged can be maintained until the next The moment when the screen is updated.
  • the pixel electrode voltage processing circuit of the present embodiment includes an operational amplifier U1 whose negative phase input terminal is connected to ground through a first resistor R1, and the negative phase input terminal is connected to an operational amplifier through a second resistor R2.
  • the third resistor R3 has a first end connected to the first input terminal IN1, a second end connected to the non-inverting input terminal of the operational amplifier U1, and a smoothing capacitor C having a first end connected to the second input Terminal IN2 has its second terminal connected to the non-inverting input of operational amplifier U1 via a fourth resistor R4.
  • the operation put The output terminal OUT of the amplifier serves as an output terminal of the pixel electrode voltage processing circuit, and outputs the processed pixel electrode voltage (Data Output).
  • the operational amplifier U1, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, and the smoothing capacitor C constitute an addition circuit.
  • the dynamic fluctuation voltage waveform (V com Feedback) of the common electrode is superimposed with the original pixel electrode voltage waveform (Data Voltage) by the addition circuit, so that the output voltage waveform (Data Output) is superimposed on the dynamics of the common electrode.
  • the ripple signal is then output to the pixel electrode, so that the charging voltage of the pixel electrode is a stable normal voltage with respect to the common electrode, the output gray scale of the pixel electrode is not deviated, and the output gray scale is normal.
  • the filter capacitor C is used to filter the DC component in the dynamic fluctuation voltage waveform (V com Feedback) of the common electrode, and only the ripple voltage or peak voltage portion in the dynamic ripple voltage is retained.
  • the filter capacitor C can be omitted when the DC component is not considered.
  • the function of the first resistor R1 is to isolate the intersection of the first resistor R1 and the second resistor R2, that is, the negative phase input terminal of the operational amplifier from the ground.
  • the superposition factor K of the dynamic fluctuation voltage waveform of the common electrode can be adjusted according to the TFT LCD condition.
  • the superposition factor K is determined by the ratio of the second resistor R and the fourth resistor R4, namely:
  • R 2 is the resistance of the second resistor R2 and R 4 is the resistance of the fourth resistor R4.
  • the second resistor R2 is a constant value resistor whose resistance R 2 is constant;
  • the fourth resistor R4 is a variable resistor.
  • the resistance value R 3 of the third resistor R3 is equal to the resistance value R 2 of the second resistor R2.
  • a display device in a second exemplary embodiment of the present invention, includes: a gate line, a data line, and a plurality of pixel units arranged in an array.
  • Each pixel unit includes: a thin film transistor, a pixel electrode, a common electrode, and a first real A pixel electrode voltage processing circuit of the embodiment.
  • the first input end of the pixel electrode voltage processing circuit is connected to the drain of the thin film transistor, the second input end is connected to the common electrode, and the output end is connected to the pixel electrode.
  • the gate of the thin film transistor is connected to the gate line, and the source is connected to the data line.
  • the present invention superimposes the dynamic voltage fluctuation (ripple or peak) voltage waveform of the common electrode on the pixel electrode, so that the charging voltage of the pixel electrode is normal voltage with respect to the common electrode, so that the output gray scale is normal, avoiding
  • image anomalies such as crosstalk, greenish or bright and dark lines residual images enhances the picture effect and user experience, and has strong practical value and popularization application prospects.

Abstract

提供了一种像素电极电压处理电路及显示装置。像素电极电压处理电路包括：第一输入端（IN 1），用于输入原始像素电极电压（Data Voltage）；第二输入端（IN 2），用于输入公共电极电压（V com Feedback）；输出端（OUT），用于输出处理后的像素电极电压（Data Output）；像素电极电压处理电路用于将公共电极电压（V com Feedback）叠加到原始像素电极电压（Data Voltage），得到相对于公共电极电压（V com Feedback）而言稳定的电压的处理后的像素电极电压（Data Output）。公共电极的波动电压（V com Feedback）叠加到原始像素电极电压（Data Voltage）上，使得像素电极输出的电压（Data Output）相对于公共电极的电压（V com Feedback）稳定地输出，从而使像素显示灰阶不受公共电极电压（V com Feedback）波动影响，消除了画面异常现象，保持了正常显示。

Description

像素电极电压处理电路及显示装置 技术领域
本发明涉及液晶显示技术领域，尤其涉及一种像素电极电压处理电路及显示装置。
背景技术
液晶平板显示器，特别是TFT-LCD，是目前唯一在亮度、对比度、功耗、寿命、体积和重量等综合性能上全面赶上甚至超过CRT的显示器件。它的性能优良、大规模生产特性好、自动化程度高、原材料成本低廉、发展空间广阔，已经成为目前的主流显示产品。
图1A和图1B分别为现有技术TFT-LCD的立体结构示意图和横截面结构示意图。参照图1A和图1B，TFT-LCD主要由后板模块100、液晶层200和前板模块300三部分组成。后板模块100是指液晶层后面的部分，主要由后偏光板110、后玻璃板120、后板电路130、后定向膜140等组成。后板电路130形成于后玻璃板上，并包括：栅线131、数据线132、像素电极133和薄膜晶体管134等。
前板模块300是指液晶层前面的部分，主要由前定向膜310、公共电极320、彩色滤光片330、前玻璃板340和前偏光片350等组成。前玻璃板340贴有彩色滤光片330，并形成有公共电极320。前、后两层玻璃板中间夹持的就是液晶层200。对于TFT-LCD而言，每个像素单元从结构上可以看作是像素电极和公共电极之间夹持一液晶层，该液晶层可以等效为一液晶电容器CLC。
图2A和图2B分别为TFT-LCD中像素单元的结构示意图和等效电路图。参照图2A和图2B，薄膜晶体管134的栅极(G极)连接至栅线131，源极(S极)连接至数据线，漏极(D极)连接至像素电极(133)。在实际应用中，由两侧的像素电极和公共电极给液晶电容器CLC充电。
液晶电容器CLC的电容值约为0.1pF。然而，液晶电容器CLC本身无法将电压保持到下一次刷新画面数据的时刻(对于一般60Hz的画面刷新频率，需要保持16ms)。由于电压发生变化，所显示的色阶就会不正确，因此一般在设计面板时，会再加上一个储存电容器Cs(一般由像素电极133和公共电极320的走线形成)，其值约为0.5pF，以让充满电的液晶电容器CLC的电压能够保持到下一次更新画面的时刻。
然而，在像素单元中，公共电极320受到其他因素的影响会产生一些纹波电压或峰值电压。而液晶电容器CLC在像素电极133和公共电极320之间充电时，像素电极133相对公共电极320的电压输出就会发生波动而形成压差，这样液晶转动就会影响灰阶的正常输出，从而出现一些画面的异常如串扰、greenish或产生亮、暗线残像等不良现象。
发明内容
(一)要解决的技术问题
鉴于上述技术问题，本发明提供了一种像素电极电压处理电路及显示装置，以消除公共电极电压波动对液晶层充电的影响。
(二)技术方案
根据本发明的一个方面，提供了一种像素电极电压处理电路。该像素电极电压处理电路包括：第一输入端IN1，用于输入原始像素电极电压；第二输入端IN2，用于输入公共电极电压；输出端OUT，用于输出处理后的像素电极电压。优选地，该像素电极电压处理电路用于将公共电极电压叠加到原始像素电极电压，得到相对于公共电极电压而言稳定的电压作为处理后的像素电极电压。
根据本发明的再一个方面，提供了一种显示装置。该显示装置包括：栅线、数据线，以及阵列排布的若干个像素单元。每一像素单元包括：薄膜晶体管、像素电极、公共电极和上述像素电极电压处理电路。优选地，像素电极电压处理电路的第一输入端连接至薄膜晶体管 的漏极，第二输入端连接公共电极，输出端连接至像素电极；并且薄膜晶体管的栅极连接至栅线，源极连接至数据线。
(三)有益效果
从上述技术方案可以看出，本发明像素电极电压处理电路及显示装置将公共电极的波动电压叠加到原始像素电压上，使得像素电极输出的电压相对于公共电极的电压稳定地输出，从而使像素显示灰阶不受公共电极电压波动的影响，消除了画面异常现象，保持了正常显示。
附图说明
图1A和图1B分别为现有技术TFT-LCD的立体结构示意图和横截面结构示意图；
图2A和图2B分别为TFT-LCD中像素单元的结构示意图和等效电路图；
图3为根据本发明第一实施例的TFT-LCD中像素单元的电路图；
图4为图3所示像素单元的电路中的像素电极电压处理电路的示意图；以及
图5为图4所示像素电极供电电路中原始像素电极电压、公共电极电压和处理后像素电极电压的波形图。
【主要元件符号说明】
100-后板模块；
110-后偏光板；    120-后玻璃板；    130-后板电路；
131-栅线；        132-数据线；      133-像素电极；
134-薄膜晶体管；  140-后定向膜；
200-液晶层；
300-前板模块；
310-前定向膜；    320-公共电极；    330-彩色滤光片；
340-前玻璃板；    350-前偏光片。
具体实施方式
本发明将公共电极的波动电压叠加到原始像素电极电压上，使得像素电极输出的电压相对于公共电极的电压稳定地输出，从而使像素显示灰阶不受公共电极电压波动的影响，消除了画面异常现象，保持了正常显示。
为使本发明的目的、技术方案和优点更加清楚明白，以下结合具体实施例，并参照附图，对本发明进一步详细说明。
图3为根据本发明第一实施例的TFT-LCD中像素单元的电路示意图。在本发明的一个示例性实施例中，图3所示TFT-LCD中像素单元的等效电路图中包括像素电极电压处理电路，该像素电极电压处理电路包括：第一输入端IN1，其输出原始像素电极电压(Data Voltage)；第二输入端IN2，其输出公共电极电压(Vcom Feedback)；和输出端OUT，用于输出处理后的像素电极电压(Data Output)。该像素电极电压处理电路用于将公共电极电压(Vcom Feedback)叠加到原始像素电极电压(Data Voltage)，得到相对于公共电极电压而言稳定的电压作为处理后像素电极电压(Data Output)。
与图2B类似，在本实施例中，第一输入端IN1连接至薄膜晶体管134的漏极(D极)，第二输入端IN2连接至公共电极320，像素电极电压处理电路的输出端OUT连接至像素电极133。关于薄膜晶体管，在现有技术中均公开有大量的技术内容，此处不再对其结构赘述。
如上所述，液晶层可以等效为一液晶电容器CIC。与图2B类似，在本实施例的像素单元中，同样包括储存电容器Cs，其两端连接至液晶电容器CLC的两端，以让充满电的液晶电容器CLC的电压能够保持到下一次更新画面的时刻。
图4为图3所示像素单元电路中的像素电极电压处理电路的示意图。参照图4，本实施例的像素电极电压处理电路包括：运算放大器U1，其负相输入端通过第一电阻器R1连接至地，且该负相输入端通过第二电阻器R2连接至运算放大器的输出端；第三电阻器R3，其第一端连接至第一输入端IN1，其第二端连接至运算放大器U1的正相输入端；滤波电容器C，其第一端连接至第二输入端IN2，其第二端通过第四电阻器R4连接至运算放大器U1的正相输入端。其中，运算放 大器的输出端OUT作为像素电极电压处理电路的输出端，输出处理后的像素电极电压(Data Output)。
在本实施例中，运算放大器U1、第一电阻器R1、第二电阻器R2、第三电阻器R3、第四电阻器R4和滤波电容器C构成加法运算电路。参照图5，通过该加法运算电路，将公共电极的动态波动电压波形(Vcom Feedback)与原始像素电极电压波形(Data Voltage)叠加，使得输出的电压波形(Data Output)叠加了公共电极的动态波动信号，然后输出至像素电极，从而，像素电极的充电电压相对于公共电极为稳定的正常电压，像素电极的输出灰阶不会产生偏差，输出灰阶正常。
在本实施例中，滤波电容器C用于将公共电极的动态波动电压波形(Vcom Feedback)中的直流分量滤除，仅保留动态波动电压中的纹波电压或峰值电压部分。当不考虑直流分量的情况下，该滤波电容器C可以省略。
在本实施例中，第一电阻器R1的作用是将第一电阻器R1和第二电阻器R2的交点，即运算放大器的负相输入端与地隔离。
在本实施例中，可以根据TFT LCD状况，调节公共电极的动态波动电压波形的叠加倍数K。该叠加倍数K由第二电阻器R和第四电阻器R4的比值决定，即：
Figure PCTCN2016084272-appb-000001
其中，R2为第二电阻器R2的阻值，R4为第四电阻器R4的阻值。一般情况下，第二电阻器R2为定值电阻，其阻值R2不变；第四电阻器R4为可变电阻器。通过调节第四电阻器R4的电阻值R4，可以确定公共电极的动态波动电压波形的叠加倍数K。其中，R4的取值在kΩ量级。
此外，在本实施例中，第三电阻器R3的阻值R3与第二电阻器R2的阻值R2相等。
在本发明的第二个示例性实施例中，还提供了一种显示装置。该显示装置包括：栅线、数据线，以及阵列排布的若干个像素单元。
每一像素单元包括：薄膜晶体管、像素电极、公共电极和第一实 施例的像素电极电压处理电路。其中，所述像素电极电压处理电路的第一输入端连接至薄膜晶体管的漏极，第二输入端连接至公共电极，输出端连接至像素电极。所述薄膜晶体管的栅极连接至栅线，源极连接至数据线。
至此，已经结合附图对本发明多个实施例进行了详细描述。依据以上描述，本领域技术人员应当对本发明像素电极电压处理电路及显示装置有了清楚的认识。
需要说明的是，在附图或说明书正文中，未绘示或描述的实现方式，均为所属技术领域中普通技术人员所知的形式，并未进行详细说明。此外，上述对各元件的定义并不仅限于实施例中提到的各种具体结构、形状或方式，本领域普通技术人员可以对其进行简单地更改或替换。
此外，本文可提供包含特定值的参数的示范，但这些参数无需确切等于相应的值，而是可以在可接受的误差容限或设计约束内近似于相应值。并且，实施例中提到的方向用语，例如“上”、“下”、“前”、“后”、“左”、“右”等，仅是参考附图的方向，并非用来限制本发明的保护范围。
综上所述，本发明通过将公共电极的动态电压波动(纹波或峰值)电压波形叠加到像素电极上去，以使得像素电极的充电电压相对公共电极为正常电压，使得输出灰阶正常，避免了串扰、greenish或亮、暗线残像等画面异常现象的产生，提升了画面效果和用户体验，具有较强的实用价值和推广应用前景。
以上所述的具体实施例，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施例而已，并不用于限制本发明，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (8)

  1. 一种像素电极电压处理电路，包括：
    第一输入端(IN1)，用于输入原始像素电极电压；
    第二输入端(IN2)，用于输入公共电极电压；以及
    输出端(OUT)，用于输出处理后的像素电极电压，
    其中，所述像素电极电压处理电路用于将所述公共电极电压叠加到所述原始像素电极电压，得到相对于公共电极电压而言稳定的电压作为所述处理后的像素电极电压。
  2. 根据权利要求1所述的像素电极电压处理电路，还包括：
    运算放大器(U1)，其负相输入端通过第一电阻器(R1)连接至地，且该负相输入端通过第二电阻器(R2)连接至运算放大器的输出端；
    第三电阻器(R3)，其第一端连接至所述第一输入端，其第二端连接至所述运算放大器(U1)的正相输入端；以及
    第四电阻器(R4)，其第一端连接至所述第二输入端，第二端连接至所述运算放大器(U1)的正相输入端；
    其中，运算放大器(U1)的输出端连接至像素电极电压处理电路的输出端。
  3. 根据权利要求2所述的像素电极电压处理电路，还包括：
    滤波电容器(C)，连接于所述第二输入端和第四电阻器(R4)的第一端之间。
  4. 根据权利要求2所述的像素电极电压处理电路，其中，所述第二电阻器(R2)的阻值R2和第四电阻器(R4)的阻值R4满足：
    Figure PCTCN2016084272-appb-100001
    其中，K为公共电极的动态波动电压波形的叠加倍数。
  5. 根据权利要求4所述的像素电极电压处理电路，其中，第二电阻器(R2)为定值电阻器，第四电阻器(R4)为可变电阻器。
  6. 根据权利要求4所述的像素电极电压处理电路，其中，所述第四电阻器(R4)的电阻值R4取kΩ量级。
  7. 根据权利要求4所述的像素电极电压处理电路，其中，所述第三 电阻器(R3)的阻值R3与第二电阻器(R2)的阻值R2相等。
  8. 一种显示装置，包括：栅线、数据线，以及阵列排布的若干个像素单元，
    其中，每一像素单元包括：薄膜晶体管、像素电极、公共电极和权利要求1至7中任一项所述的像素电极电压处理电路，
    所述像素电极电压处理电路的第一输入端连接至薄膜晶体管的漏极，第二输入端连接所述公共电极，输出端连接至像素电极；
    所述薄膜晶体管的栅极连接至栅线，源极连接至数据线。
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