WO2014198100A1 - 公共电极电压调节装置及其方法 - Google Patents

公共电极电压调节装置及其方法 Download PDF

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Publication number
WO2014198100A1
WO2014198100A1 PCT/CN2013/085473 CN2013085473W WO2014198100A1 WO 2014198100 A1 WO2014198100 A1 WO 2014198100A1 CN 2013085473 W CN2013085473 W CN 2013085473W WO 2014198100 A1 WO2014198100 A1 WO 2014198100A1
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WIPO (PCT)
Prior art keywords
voltage value
common electrode
electrode voltage
pixel unit
pixel
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PCT/CN2013/085473
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English (en)
French (fr)
Inventor
王智勇
郑义
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BOE Technology Group Co Ltd
Beijing BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Beijing BOE Optoelectronics Technology Co Ltd
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Priority to US14/386,576 priority Critical patent/US9886925B2/en
Publication of WO2014198100A1 publication Critical patent/WO2014198100A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3685—Details of drivers for data electrodes
    • G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0404—Matrix technologies
    • G09G2300/0413—Details of dummy pixels or dummy lines in flat panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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
    • 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
    • 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
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular, to a common electrode voltage adjusting device and a method thereof. Background technique
  • TFT thin film transistor
  • the transmittance of the liquid crystal and the transmittance of the liquid crystal when the positive voltage is driven will be different, and the human eye will feel the flicker of the screen and flicker for a long time. It can also cause discomfort to the human eye.
  • the prior art realizes by manually adjusting the voltage of the common electrode, that is, by adjusting the voltage of the common electrode to compensate the pixel voltage, specifically by a personal computer connected to the driving integrated circuit (IC), etc.
  • Manual adjustments are made in real time, such as: Adjusting the common electrode voltage by changing the program in real time, and in order to eliminate operator error, a standard flash test device is required. It can be seen that the existing implementation method not only wastes human resources, but also has low work efficiency. Summary of the invention
  • the present invention provides a common electrode voltage adjusting device and a method thereof for the technical problems existing in the prior art, which can automatically adjust the voltage of the common electrode and improve the working efficiency.
  • a common electrode voltage regulating device including:
  • a signal processing module configured to superimpose a pixel voltage value of the pixel unit and a common electrode voltage value, and output a superposition signal
  • a comparison module configured to receive a superimposed signal output by the signal processing module, compare the superimposed signal with a ground terminal voltage, and output a control signal
  • a driving module configured to receive a control signal output by the comparison module, and pass the control signal The common electrode voltage value is adjusted.
  • the pixel unit is a preset virtual pixel unit.
  • the virtual pixel unit is disposed at an edge position of the array substrate, and is the same as the existing pixel unit on the array substrate, and the connection relationship is the same.
  • the signal processing module includes:
  • An adder configured to add a pixel voltage value of the pixel unit to a common electrode voltage value, and send the operation result to the integrator;
  • An integrator is configured to perform an integral calculation on the addition result and send the calculation result to the comparison module.
  • the comparison module includes a comparator for comparing the integrated calculation result received from the integrator with a ground terminal voltage, and transmitting the comparison result to the drive module.
  • the driving module is configured to adjust the common electrode voltage value when a superposition value of a pixel voltage value and a common electrode voltage value of the pixel unit is different from a ground voltage value.
  • the driving module is configured to store the current common electrode voltage value when the superimposed value of the pixel voltage value and the common electrode voltage value of the pixel unit is the same as the ground terminal voltage value.
  • the present invention also provides a method for adjusting a common electrode voltage, the method comprising the steps of: superimposing a pixel voltage value of a pixel unit and a common electrode voltage value, and outputting a superimposed signal; performing the superimposed signal and a ground terminal voltage Comparing and outputting a control signal; and adjusting the common electrode voltage value by the control signal.
  • the step of superimposing the pixel voltage value of the pixel unit and the common electrode voltage value may specifically include:
  • the pixel voltage value of the pixel unit is added to the common electrode voltage value, and then the addition result is integrated.
  • the step of adjusting the common electrode voltage value by using the control signal may specifically include:
  • the value of the common electrode voltage is increased; if the superimposed voltage value is less than the ground terminal voltage value, the value of the common electrode voltage is decreased.
  • the value of the current common electrode voltage is stored.
  • the common electrode voltage adjusting device and the method thereof are provided in the embodiment of the present invention, the virtual pixel unit is disposed at an edge position of the array substrate, and the virtual pixel unit and the existing pixel unit on the array substrate The same, the connection relationship is the same, and therefore the same as the pixel voltage of the existing pixel unit.
  • the pixel voltage value of the pixel unit is superimposed with the common electrode voltage value, and a superimposed signal is output; the superimposed signal is compared with the ground terminal voltage, and a control signal is output;
  • the common electrode voltage value is adjusted. Specifically, if it is determined that the voltage values after the superposition are not zero, the common electrode voltage value is adjusted by the driving integrated circuit until the superimposed value of the two is zero.
  • the common electrode voltage adjustment process of the present invention does not require human intervention, and is automatically realized by a combination of the set common electrode voltage adjusting device and the driving IC, thereby saving human resources, having no operator error, and improving work efficiency. . DRAWINGS
  • FIG. 1 is a schematic plan view showing a planar structure of an array substrate provided with a virtual pixel unit according to an embodiment of the present invention
  • FIG. 2 is a schematic structural view of a common electrode voltage adjusting device according to an embodiment of the present invention
  • FIG. 3 is a detailed structural diagram of a common electrode voltage adjusting device according to an embodiment of the present invention.
  • the basic idea of the present invention is: superimposing a pixel voltage value of a pixel unit and a common electrode voltage value, and outputting a superimposed signal; comparing the superimposed signal with a ground terminal voltage, and outputting a control signal; The signal adjusts the common electrode voltage value. Automatic adjustment of the common electrode voltage is achieved using the difference between the pixel voltage and the common electrode voltage.
  • the pixel unit is a preset virtual pixel unit, and the virtual pixel unit is disposed at an edge position of the array substrate, and is the same as the existing pixel unit on the array substrate, and the connection relationship is the same;
  • the position around the panel is not opaque.
  • FIG. 1 is a schematic diagram showing the planar structure of an array substrate provided with virtual pixel units according to an embodiment of the present invention.
  • a row of virtual pixel units 1 is disposed on an edge position (marked by a dotted line frame) on the array substrate, and the virtual pixel unit 1 is identical to the existing pixel unit 2 on the array substrate, and the virtual The connection relationship between the pixel unit and the data line and the gate line is the same as that of the pixel unit 2, that is, the virtual pixel unit
  • the TFT gate is connected to the gate line, and the source is connected to the data line. Therefore, the pixel voltage value of the dummy pixel unit 1 is the same as the pixel voltage value of the pixel unit 2.
  • the purpose of setting the virtual pixel unit 1 is to prevent the performance of the existing pixel unit from being affected during the adjustment process, that is, to avoid affecting the display quality of the display panel.
  • only one row of virtual pixel units can be set here.
  • the apparatus includes: a signal processing module 4, a comparison module 8, and a driving module 3.
  • the signal processing module 4 is configured to superimpose the pixel voltage value of the pixel unit and the common electrode voltage value, and output a superimposed signal.
  • the signal processing module 4 is connected to the output end of the virtual pixel unit 1 and is connected to the driving module 3 for acquiring the pixel voltage value of the pixel unit and the common electrode voltage value.
  • the comparison module 8 is configured to receive the superimposed signal output by the signal processing module 4, compare the superimposed signal with a ground terminal voltage, and output a control signal.
  • the ground terminal voltage is zero.
  • the driving module 3 is configured to receive a control signal output by the comparison module 8, and adjust the common electrode voltage value by using the control signal.
  • the driving module 3 is configured to adjust the common electrode voltage value when a superposition value of a pixel voltage value of the pixel unit and the common electrode voltage value is not zero.
  • the pixel voltage value is symmetrically distributed along the common voltage value line, that is, the superposition value of the pixel voltage value and the common voltage value is zero. If it is determined that the superimposed voltage value is greater than zero, it is proved that the common electrode voltage compensation is insufficient, and then the increase is performed. The value of the common electrode voltage; if it is determined that the superimposed voltage value is less than zero, it is proved that the common electrode voltage is excessively compensated, and it is necessary to reduce the value of the common electrode voltage.
  • the driving module 3 may be further configured to store a value of the current common electrode voltage when a superposition value of the pixel voltage value of the pixel unit and the common electrode voltage value is equal to zero.
  • the pixel voltage can be subsequently compensated according to the value of the common electrode voltage to achieve the beneficial effect of avoiding picture flicker.
  • the driver IC can write the value of the current common electrode voltage into the read only memory in the driver IC through the lighting device. It should be noted that since the pixel voltage value changes positively and negatively with the AC driving voltage of the liquid crystal, if it is superimposed with the common electrode voltage value, if it is exactly zero, it is proved that the compensation of the common electrode voltage value is correct.
  • FIG. 3 is a detailed structural diagram of a common electrode voltage adjusting device according to an embodiment of the present invention.
  • the signal processing module 4 includes an adder 5 and an integrator 6, and the comparison module 8 includes a comparator 7.
  • the pixel electrode voltage (Vpixel) of the dummy pixel unit (not shown in FIG. 3) and the common electrode voltage (Vcom) drawn from the driving module are connected to the input terminal of the adder 5, and the output terminal of the adder 5
  • the output of the integrator 6 is connected to one input of the comparator 7, and the other input of the comparator 7 is grounded, ie the voltage value is zero;
  • the output of the device 7 is connected to the drive module 3.
  • the adder 5 is configured to add a pixel voltage value of the pixel unit and a common electrode voltage value, and send the operation result to the integrator, wherein the adder is actually a pixel voltage of the pixel unit The value is subtracted from the common electrode voltage value, that is, the pixel voltage value is added to the common electrode voltage value with a negative sign, and the adder used can be realized by using an existing addition circuit.
  • the integrator 6 is configured to perform an integral calculation on the addition result, and send the calculation result to the comparison module, and the integrator can be implemented by using an existing integral operation circuit.
  • the comparator is configured to receive an integral calculation result sent by the integrator and compare the ground terminal voltage, and send the comparison result to the driving module.
  • the adder, integrator and comparator of the present invention may be integrated into the drive IC.
  • a method for automatically adjusting a common electrode voltage is also provided in an embodiment of the present invention, the method comprising the following steps:
  • the superimposing the pixel voltage value of the pixel unit and the common electrode voltage value may specifically include:
  • the pixel voltage value of the pixel unit is added to the common electrode voltage value, and then the addition result is integrated.
  • the adjusting the common electrode voltage value by using the control signal may specifically include:
  • the value of the common electrode voltage is increased; if the superimposed voltage value is less than zero, the value of the common electrode voltage is decreased.
  • the pixel unit is a preset virtual pixel unit, and the virtual pixel unit is disposed at an edge position of the array substrate, and the virtual pixel unit is the same as the existing pixel unit on the array substrate, and the connection relationship is the same.
  • the method further includes: if the pixel voltage value of the pixel unit and the common electrode voltage value After the superimposed voltage value is zero, the value of the current common electrode voltage is stored.
  • the storing the value of the current common electrode voltage may specifically be:
  • the value of the current common electrode voltage can be written by the driver IC through a lighter into a read only memory in the driver IC.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)

Abstract

一种公共电极电压调节装置，所述装置包括：信号处理模块（4），用于将像素单元（2）的像素电压值与公共电极电压值进行叠加，并输出一叠加信号；比较模块（8），用于接收所述信号处理模块（4）输出的叠加信号，将所述叠加信号与接地端电压进行比较，并输出一控制信号；驱动模块（3），用于接收所述比较模块（8）输出的控制信号，并通过所述控制信号对所述公共电极电压值进行调整。还公开了一种公共电极电压调节方法。本申请可获得稳定像素电极电压，避免画面闪烁的效果，并可实现自动调节公共电极电压的目的，节省人力资源，提高工作效率。

Description

公共电极电压调节装置及其方法 技术领域
本发明涉及液晶显示技术领域， 尤其涉及一种公共电极电压调节装置及其 方法。 背景技术
现有液晶显示器中的薄膜场效应晶体管 （ Thin Film Transistor, TFT )开关 中的栅极和源极之间存在电容。 当 TFT开关关闭时， 栅极电压由高电平变换至 低电平， 由于栅极和源极之间电容的存在， 电容耦合效应会将像素电极上的电 压 （即像素电压）拉低， 偏离系统给定的电压， 从而影响液晶的偏转方向， 改 变透过率。 又因为液晶通过电压的极性反转进行驱动， 正电压驱动时液晶的透 过率与负电压驱动时液晶的透过率将产生差异， 人眼就会感受到画面的闪烁， 长时间的闪烁还会引起人眼的不适。
为了解决所述画面闪烁的问题， 现有技术通过人工调节公共电极电压来实 现， 即通过调节公共电极电压的大小实现对像素电压的补偿， 具体通过与驱动 集成电路（IC )相连的个人计算机等实时手动进行调节， 如： 通过实时改变程 序等对公共电极电压进行调节， 同时， 为了消除操作者之间误差， 还需要一台 标准的闪烁测试设备。 可见， 现有的实现方法不仅浪费人力资源， 而且工作效 率不高。 发明内容
有鉴于此， 本发明针对现有技术中存在的技术问题提供一种公共电极电压 调节装置及其方法， 可实现自动调节公共电极电压， 提高工作效率。
本发明实施例的技术方案可以这样实现：
提供一种公共电极电压调节装置， 包括：
信号处理模块，用于将像素单元的像素电压值与公共电极电压值进行叠加， 并输出一叠加信号；
比较模块， 用于接收所述信号处理模块输出的叠加信号， 并将所述叠加信 号与接地端电压进行比较， 并输出一控制信号； 以及
驱动模块， 用于接收所述比较模块输出的控制信号， 并通过所述控制信号 对所述公共电极电压值进行调整。
可选择地， 所述像素单元为预设的虚拟像素单元。
可选择地， 所述虚拟像素单元设置于阵列基板边缘位置， 与所述阵列基板 上已有的像素单元相同， 连接关系相同。
可选择地， 所述信号处理模块包括：
加法器， 用于将所述像素单元的像素电压值与公共电极电压值进行加法运 算， 并将运算结果发送到所述积分器； 以及
积分器， 用于对所述加法运算结果执行积分计算， 并将计算结果发送到所 述比较模块。
可选择地， 所述比较模块包括比较器， 用于将从所述积分器接收的积分计 算结果与接地端电压进行比较， 并将比较结果发送到所述驱动模块。
可选择地， 所述驱动模块用于在所述像素单元的像素电压值与公共电极电 压值的叠加值与接地端电压值不同时， 对所述公共电极电压值进行调整。
可选择地， 所述驱动模块用于在所述像素单元的像素电压值与公共电极电 压值的叠加值与接地端电压值相同时， 存储当前公共电极电压值。
本发明还提供一种公共电极电压的调节方法， 该方法包括下列步骤： 将像素单元的像素电压值与公共电极电压值进行叠加，并输出一叠加信号； 将所述叠加信号与接地端电压进行比较， 并输出一控制信号； 以及 通过所述控制信号对所述公共电极电压值进行调整。
可选择地， 所述将像素单元的像素电压值与公共电极电压值进行叠加的步 骤具体可包括：
将像素单元的像素电压值与公共电极电压值进行加法运算， 之后对所述加 法运算结果进行积分。
可选择地， 所述通过所述控制信号对所述公共电极电压值进行调整的步骤 具体可包括：
如果叠加后的电压值大于接地端电压值， 则增大所述公共电极电压的值； 如果叠加后的电压值小于接地端电压值， 则减小所述公共电极电压的值。
可选择地， 如果像素单元的像素电压值与公共电极电压值叠加后的电压值 为接地端电压时， 则存储当前公共电极电压的值。
本发明实施例中提供的公共电极电压调节装置及其方法， 在阵列基板边缘 位置设置虚拟像素单元， 所述虚拟像素单元与所述阵列基板上已有的像素单元 相同， 连接关系相同， 因此与已有像素单元的像素电压相同。 实际运行过程中， 将像素单元的像素电压值与公共电极电压值进行叠加， 并输出一叠加信号； 将 所述叠加信号与接地端电压进行比较， 并输出一控制信号； 通过所述控制信号 对所述公共电极电压值进行调整。 具体地， 如果确定两者叠加后的电压值不为 零， 则由所述驱动集成电路对所述公共电极电压值进行调整， 直至两者的叠加 值为零。 若叠加值正好为零， 则证明公共电极电压值的补偿是正确的， 达到了 稳定像素电极电压， 并避免画面闪烁的效果。 此外， 本发明的公共电极电压调 节过程不需人为参与，通过设置的公共电极电压调节装置和驱动 IC的结合自动 实现， 因此， 可节省人力资源， 不存在操作者之间误差， 工作效率得到提高。 附图说明
图 1为本发明实施例设有虚拟像素单元的阵列基板平面结构示意图； 图 2为本发明实施例的公共电极电压调节装置的结构示意图；
图 3为本发明实施例的公共电极电压调节装置的具体结构图。
附图标记说明：
1、 虚拟像素单元； 2、 像素单元； 3、 驱动模块； 4、 信号处理模块； 5、 加 法器； 6、 积分器； 7、 比较器； 8、 比较模块。 具体实施方式
本发明的基本思想是： 将像素单元的像素电压值与公共电极电压值进行叠 加， 并输出一叠加信号； 将所述叠加信号与接地端电压进行比较， 并输出一控 制信号； 通过所述控制信号对所述公共电极电压值进行调整。 利用像素电压与 公共电极电压间的差值为条件实现对公共电极电压的自动调节。
其中， 所述像素单元为预设的虚拟像素单元， 所述虚拟像素单元设置于阵 列基板边缘位置， 与所述阵列基板上已有的像素单元相同， 连接关系相同； 所 述阵列基板边缘对应显示面板四周不透光的位置。
下面结合附图及具体实施例对本发明作进一步详细说明。
图 1为本发明实施例设有虚拟像素单元的阵列基板平面结构示意图。 如图 1 所示， 在所述阵列基板上边缘位置（虚线框标示位置）设置有一行虚拟像素 单元 1 , 所述虚拟像素单元 1与阵列基板上已有的像素单元 2相同， 且所述虚 拟像素单元与数据线和栅极线的连接关系与像素单元 2相同， 即虚拟像素单元 1 中 TFT栅极与栅极线相连， 源极与数据线相连。 因此， 所述虚拟像素单元 1 的像素电压值与像素单元 2的像素电压值相同。 这里， 设置所述虚拟像素单元 1 的目的是为了防止在调节过程中影响已有像素单元的性能， 也就是避免影响 显示面板的显示质量。 作为举例说明， 这里可以只设置一行虚拟像素单元。
图 2为本发明实施例的公共电极电压调节装置的结构示意图。如图 2所示， 所述装置包括： 信号处理模块 4、 比较模块 8和驱动模块 3。
所述信号处理模块 4用于将像素单元的像素电压值与公共电极电压值进行 叠加， 并输出一叠加信号。
这里， 所述信号处理模块 4与虚拟像素单元 1的输出端相连， 且与驱动模 块 3相连， 用于获取像素单元的像素电压值以及公共电极电压值。
所述比较模块 8用于接收所述信号处理模块 4输出的叠加信号， 并将所述 叠加信号与接地端电压进行比较， 并输出一控制信号， 本实施例中接地端电压 为零。
所述驱动模块 3用于接收所述比较模块 8输出的控制信号， 并通过所述控 制信号对所述公共电极电压值进行调整。
具体地， 所述驱动模块 3用于在所述像素单元的像素电压值与所述公共电 极电压值的叠加值不为零时对所述公共电极电压值进行调整。 理想地像素电压 值沿着公共电压数值线对称分布， 即像素电压值与公共电压值的叠加值为零， 如果确定叠加后的电压值大于零， 则证明公共电极电压补偿不够， 则增大所述 公共电极电压的值； 如果确定叠加后的电压值小于零， 则证明公共电极电压补 偿过多， 需要减小所述公共电极电压的值。 可选择地， 所述驱动模块 3还可用于在所述像素单元的像素电压值与公共 电极电压值的叠加值等于零时， 存储当前公共电极电压的值。
这样， 后续可根据该公共电极电压的值对所述像素电压进行补偿， 以达到 避免画面闪烁的有益效果。例如： 驱动 IC可通过点灯机将所述当前的公共电极 电压的值写入驱动 IC中的只读存储器中。需要说明的是， 因为像素电压值会随 液晶的交流驱动电压而正负变化， 与公共电极电压值叠加后， 若正好为零， 则 证明公共电极电压值的补偿是正确的。
图 3为本发明实施例的公共电极电压调节装置的具体结构图。如图 3所示， 所述信号处理模块 4包括：加法器 5和积分器 6,所述比较模块 8包括比较器 7。 其中， 所示虚拟像素单元（图 3 未示出） 的像素电极电压 （Vpixel )和从所述 驱动模块引出的公共电极电压（ Vcom )与加法器 5的输入端相连， 加法器 5的 输出端与所述积分器 6的输入端相连， 所述积分器 6的输出端与所述比较器 7 的一个输入端相连， 比较器 7的另一个输入端接地， 即电压值为零； 所述比较 器 7的输出端与驱动模块 3相连。
所述加法器 5用于将所述像素单元的像素电压值与公共电极电压值进行加 法运算， 并将运算结果发送到所述积分器， 其中， 所述加法器实际是将像素单 元的像素电压值与公共电极电压值进行减法运算， 即像素电压值与带负号的公 共电极电压值进行加法运算， 所用加法器采用现有的加法运算电路即可实现。
所述积分器 6用于对所述加法运算结果执行积分计算， 并将计算结果发送 到所述比较模块， 所述积分器采用现有的积分运算电路即可实现。
所述比较器用于接收所述积分器所发的积分计算结果与接地端电压进行比 较， 并将比较结果发送到所述驱动模块。
可选择地，本发明所述加法器、积分器和比较器可集成到所述驱动 IC内部。 本发明实施例中还提供了一种自动调节公共电极电压的方法， 该方法包括 下列步骤：
将像素单元的像素电压值与公共电极电压值进行叠加，并输出一叠加信号； 将所述叠加信号与接地端电压进行比较， 并输出一控制信号； 通过所述控制信 号对所述公共电极电压值进行调整。
其中， 所述将像素单元的像素电压值与公共电极电压值进行叠加， 具体可 包括：
将像素单元的像素电压值与公共电极电压值进行加法运算， 之后对所述加 法运算结果进行积分。
其中， 所述通过所述控制信号对所述公共电极电压值进行调整， 具体可包 括：
如果叠加后的电压值大于零， 则增大所述公共电极电压的值； 如果叠加后 的电压值小于零， 则减小所述公共电极电压的值。
其中， 所述像素单元为预设的虚拟像素单元， 所述虚拟像素单元设置在阵 列基板边缘位置， 所述虚拟像素单元与所述阵列基板上已有的像素单元相同， 连接关系相同。
可选择地， 该方法还包括： 如果像素单元的像素电压值与公共电极电压值 叠加后的电压值为零， 则存储当前公共电极电压的值。
其中， 所述存储当前公共电极电压的值， 具体可以为：
可由驱动 IC通过点灯机将所述当前公共电极电压的值写入驱动 IC中的只 读存储器内。
以上所述，仅为本发明的示例性实施例， 并非用于限定本发明的保护范围。 实质和范围。 本发明的保护范围以所附权利要求的保护范围为准。

Claims

权 利 要 求 书
1、 一种公共电极电压调节装置， 包括：，
信号处理模块，用于将像素单元的像素电压值与公共电极电压值进行叠加， 并输出一叠加信号；
比较模块， 用于接收所述信号处理模块输出的叠加信号， 将所述叠加信号 与接地端电压进行比较， 并输出一控制信号； 及
驱动模块， 用于接收所述比较模块输出的控制信号， 并通过所述控制信号 对所述公共电极电压值进行调整。
2、 根据权利要求 1所述的装置， 其中， 所述像素单元为预设的虚拟像素单 元。
3、 根据权利要求 2所述的装置， 其中， 所述虚拟像素单元设置于阵列基板 边缘位置， 与所述阵列基板上已有的像素单元相同， 连接关系相同。
4、 根据权利要求 1所述的装置， 其中， 所述信号处理模块包括：
加法器， 用于将所述像素单元的像素电压值与公共电极电压值进行加法运 算， 并将运算结果发送到所述积分器；
积分器， 用于对所述加法运算结果执行积分计算， 并将计算结果发送到所 述比较模块。
5、 根据权利要求 4所述的装置， 其中， 所述比较模块包括比较器， 用于将 从所述积分器接收的积分计算结果与接地端电压进行比较， 并将比较结果发送 到所述驱动模块。
6、 根据权利要求 1所述的装置， 其中， 所述驱动模块用于在所述像素单元 的像素电压值与公共电极电压值的叠加值与接地端电压值不同时， 对所述公共 电极电压值进行调整。
7、 根据权利要求 6所述的装置， 其中， 所述驱动模块用于在所述像素单元 的像素电压值与公共电极电压值的叠加值与接地端电压值相同时， 存储当前公 共电极电压值。
8、 一种用于公共电极电压调节装置的调节方法， 包括下列步骤：
将像素单元的像素电压值与公共电极电压值进行叠加，并输出一叠加信号； 将所述叠加信号与接地端电压进行比较， 并输出一控制信号；
通过所述控制信号对所述公共电极电压值进行调整。
9、 根据权利要求 8所述的方法， 其中， 所述将像素单元的像素电压值与公 共电极电压值进行叠加包括：
将像素单元的像素电压值与公共电极电压值进行加法运算， 之后对所述加 法运算结果进行积分。
10、 根据权利要求 8所述的方法， 其中， 所述通过所述控制信号对所述公 共电极电压值进行调整包括：
如果叠加后的电压值大于接地端电压值， 则增大所述公共电极电压的值； 如果叠加后的电压值小于接地端电压值， 则减小所述公共电极电压的值。
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