WO2012145942A1 - 液晶显示器的驱动方法 - Google Patents

液晶显示器的驱动方法 Download PDF

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Publication number
WO2012145942A1
WO2012145942A1 PCT/CN2011/073959 CN2011073959W WO2012145942A1 WO 2012145942 A1 WO2012145942 A1 WO 2012145942A1 CN 2011073959 W CN2011073959 W CN 2011073959W WO 2012145942 A1 WO2012145942 A1 WO 2012145942A1
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Prior art keywords
voltage
common
liquid crystal
pixel
compensation
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English (en)
French (fr)
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郭东胜
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to CN201180010316.3A priority Critical patent/CN102893205B/zh
Priority to US13/145,003 priority patent/US8736530B2/en
Publication of WO2012145942A1 publication Critical patent/WO2012145942A1/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
    • G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • 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
    • G09G3/3696—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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0204—Compensation of DC component across the pixels 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
    • 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
    • G09G2320/0257—Reduction of after-image effects

Definitions

  • the present invention relates to a driving method, and more particularly to a driving method of a liquid crystal display.
  • FIG. 1 is a schematic cross-sectional view of a conventional liquid crystal display.
  • liquid crystal displays are driven by an alternating current voltage. Therefore, there are two electrodes at both ends of the liquid crystal layer, one side is the common electrode 100, and the other side is the pixel electrode 200, and positive and negative impurity ions 10 are present inside the liquid crystal.
  • FIG. 2 is a waveform diagram of driving voltages in the conventional AC driving.
  • Vp1 and Vp2 the voltage VCOM of the common electrode 100 and the pixel electrode 200 are in different frames, and an electric field having the opposite voltage difference is formed to realize the liquid crystal.
  • the AC voltage is driven.
  • Figure 3 and Figure 4 Figure 3 Schematic diagram of impurity ion movement when adding Vp1
  • Figure 4 Schematic diagram of the movement of impurity ions when Vp2 is added.
  • Vp1 When the voltage of Vp1 is added, that is, Vp1 ⁇ VCOM, the positive and negative ions move by a distance d.
  • Vd2 is added, that is, Vp2>VCOM, the positive and negative impurity ions will also move in the opposite direction of d, so that the internal impurity ions 10 will not aggregate.
  • the common electrode 100 is a fixed voltage. However, in order to achieve some improvement in image quality or to implement other driving structures, the common electrode is set to be varied. In either case, it is required that the absolute value of the differential pressure across the electrodes should be as equal as possible at a certain gray level. Please refer to FIG. 5 and FIG. 6.
  • FIG. 5 is a schematic diagram of driving voltage waveforms with different voltage differences at both ends
  • FIG. 6 is a schematic diagram of impurity ion movement by adding the voltage shown in FIG. 5.
  • An object of the present invention is to provide a driving method of a liquid crystal display, which intentionally creates a charge residue and solves the problem of the above-described charge remaining by adjusting a driving voltage.
  • a driving method of a liquid crystal display comprising: a common electrode, a pixel electrode, and a liquid crystal layer between the common electrode and the pixel electrode, and having a plurality of impurity ions and a pixel for Show a grayscale.
  • the driving method includes: separating the plurality of impurity ions to the common electrode and the pixel electrode to form an internal electric field in the liquid crystal layer; and providing a common voltage at the common electrode according to the gray scale, and The pixel electrode provides a first compensation voltage and a second compensation voltage, and the first compensation voltage and the second compensation voltage are used to compensate the internal electric field, so that the first compensation voltage and the second compensation voltage are relative to the The difference in the common voltage is equal.
  • separating the plurality of impurity ions provides an offset common voltage at the common electrode, and providing a first voltage and a second voltage at the pixel electrode such that the first voltage and the second voltage are opposite
  • the difference between the offset common voltages is not equal.
  • the second voltage is greater than the first voltage
  • the offset common voltage is between the first voltage and the second voltage.
  • the difference between the offset common voltage and the first voltage is greater than a difference between the offset common voltage and the second voltage.
  • the direction of the internal electric field is from the pixel electrode toward the common electrode.
  • the first compensation voltage is a first pixel voltage minus a voltage value of the internal electric field
  • the second compensation voltage is a second pixel voltage minus a voltage value of the internal electric field.
  • the difference between the offset common voltage and the first voltage is less than a difference between the offset common voltage and the second voltage.
  • the direction of the internal electric field is from the common electrode toward the pixel electrode.
  • the first compensation voltage is a first pixel voltage plus a voltage value of the internal electric field
  • the second compensation voltage is a second pixel voltage plus a voltage value of the internal electric field.
  • the first compensation voltage and the second compensation voltage are adjusted by a resistor or a digital-to-analog conversion integrated circuit.
  • the present invention solves the above problem from the reverse phase by deliberately manufacturing charge accumulation, and then providing correct display of the picture by providing the first compensation voltage and the second compensation voltage. Accordingly, on the one hand, the influence of charge residue on the image is eliminated, and on the other hand, even if there is some deviation between the voltage difference between the common electrode and the pixel electrode, there is no influence of the accumulation of the impurity ions which are moved further, resulting in a picture. The exception is displayed.
  • the present invention solves the above problems from the inversion by deliberately creating charge accumulation, and by providing the first compensation voltage and the second compensation voltage, realizing correct display of the picture. Accordingly, on the one hand, the influence of charge residue on the image is eliminated, and on the other hand, even if there is some deviation between the voltage difference between the common electrode and the pixel electrode, there is no influence of the accumulation of the impurity ions which are moved further, resulting in a picture. The exception is displayed.
  • FIG. 1 is a schematic cross-sectional view of a conventional liquid crystal display.
  • Fig. 2 is a diagram showing a driving voltage waveform at the time of conventional AC driving.
  • Fig. 3 is a schematic view showing the movement of impurity ions when Vp1 is added.
  • Fig. 4 is a schematic view showing the movement of impurity ions when Vp2 is added.
  • Fig. 5 is a diagram showing driving voltage waveforms in which the voltage differences at both ends are not equal.
  • Fig. 6 is a schematic view showing the movement of impurity ions added to the voltage shown in Fig. 5.
  • Figure 7 is a schematic view of a liquid crystal display according to a first preferred embodiment of the present invention.
  • Fig. 8 is a flow chart showing a driving method of the liquid crystal display of the present invention.
  • Fig. 9 is a diagram showing a driving voltage waveform pattern provided by the first embodiment.
  • Fig. 10 is a diagram showing a driving voltage waveform pattern provided by the second embodiment.
  • Figure 11 is a schematic view of a liquid crystal display of a second preferred embodiment.
  • Fig. 12 is a waveform diagram of the first compensation voltage and the second compensation voltage in the first embodiment.
  • Fig. 13 is a waveform diagram of the first compensation voltage and the second compensation voltage in the second embodiment.
  • FIG. 7 is a schematic diagram of a liquid crystal display according to a first preferred embodiment of the present invention
  • FIG. 8 is a flow chart of a driving method of the liquid crystal display of the present invention.
  • the liquid crystal display includes a plurality of pixel units 1000, a plurality of common electrodes 100, a plurality of pixel electrodes 200, and a liquid crystal layer 150.
  • FIG. 7 depicts only a single pixel 1000, a single common electrode 100, and a single pixel electrode 200.
  • the common electrode 100 and the pixel electrode 200 face the surface of the liquid crystal layer 150 with an alignment film 120.
  • the liquid crystal layer 150 is located between the common electrode 100 and the pixel electrode 200 and has a plurality of impurity ions 10.
  • the pixel 1000 is used to display a gray scale.
  • the driving method includes steps S10 and S20.
  • step S10 the plurality of impurity ions 10 are separated to the common electrode 100 and the pixel electrode 200 to form an internal electric field Vi in the liquid crystal layer 150.
  • FIG. 9 is a diagram showing a driving voltage waveform pattern provided by the first embodiment.
  • the plurality of impurity ions 10 are separated by providing an offset common voltage VCOM' at the common electrode 100, and providing a first voltage Va and a second at the pixel electrode 200.
  • the voltage Vb is such that the difference between the first voltage Va and the second voltage Vb with respect to the offset common voltage VCOM' is not equal.
  • the second voltage Vb is greater than the first voltage Va
  • the offset common voltage VCOM' is between the first voltage Va and the second voltage Vb.
  • adjustment can be made through a common gate driver and source driver in conjunction with a resistor or digital-to-analog conversion (DAC) integrated circuit, although the invention is not limited to this implementation.
  • DAC digital-to-analog conversion
  • the difference between the offset common voltage VCOM' and the first voltage Va is greater than the difference between the offset common voltage VCOM' and the second voltage Vb. That is, the offset common voltage VCOM' is close to the second voltage Vb, which causes the positive and negative impurity ions 10 to gradually collect toward the alignment film 120 on the common electrode 100 and the pixel electrode 200, as shown in FIG. Since the offset common voltage VCOM' is very close to the second voltage Vb, the positive impurity ions 10 are all concentrated toward the pixel electrode 200, and the negative impurity ions 10 are all collected toward the common electrode 100, and the impurity ions 10 are established during the aggregation process.
  • the internal electric field Ei gradually reaches a maximum value, that is, a charge residue is formed. Therefore, the internal electric field Ei becomes a constant value.
  • the direction of the internal electric field Ei is from the pixel electrode 200 toward the common electrode 100. It is worth mentioning that the internal electric field Ei multiplied by the thickness D of the liquid crystal layer 150 is the built-in voltage Vi established by the internal electric field Ei across the common electrode 100 and the pixel electrode 200. Similarly, the built-in voltage Vi also becomes a constant value.
  • FIG. 10 is a schematic diagram of a driving voltage waveform diagram provided by the second embodiment
  • FIG. 11 is a schematic diagram of a liquid crystal display according to a second preferred embodiment.
  • the difference between the offset common voltage VCOM' and the first voltage Va is smaller than the difference between the offset common voltage VCOM' and the second voltage Vb. That is, the offset common voltage VCOM' is close to the first voltage Va, which causes the positive and negative impurity ions 10 to gradually collect toward the alignment film 120 on the common electrode 100 and the pixel electrode 200, as shown in FIG.
  • the positive impurity ions 10 are all concentrated toward the common electrode 100, and the negative impurity ions 10 are all collected toward the pixel electrode 200, and the impurity ions 10 are established during the aggregation process.
  • the internal electric field Ei gradually reaches a maximum value, that is, a charge residue is formed. Therefore, the internal electric field Ei becomes a constant value.
  • the direction of the internal electric field Ei is from the common electrode 100 toward the pixel electrode 200. It is worth mentioning that the internal electric field Ei multiplied by the thickness D of the liquid crystal layer 150 is the built-in voltage Vi established by the internal electric field Ei across the common electrode 100 and the pixel electrode 200. Similarly, the built-in voltage Vi also becomes a constant value.
  • a common voltage VCOM is supplied to the common electrode 100 according to the gray scale, and a first compensation voltage Vc1 and a second compensation voltage Vc2 are provided at the pixel electrode 200, the first compensation voltage Vc1.
  • the second compensation voltage Vc2 is used to compensate the internal electric field Ei such that the difference between the first compensation voltage Vc1 and the second compensation voltage Vc2 with respect to the common voltage VCOM is equal.
  • FIG. 12 is a waveform diagram of the first compensation voltage Vc1 and the second compensation voltage Vc2 in the first embodiment.
  • the pixel voltage required to be provided is the first pixel voltage Vp1 and the second pixel voltage Vp2, and the difference between Vp1 and Vp2 with respect to the common voltage VCOM is equal.
  • the formed external electric field E1 is inverted from the internal electric field Ei such that the actual first pixel voltage Vp1 is close to the common voltage VCOM.
  • the first compensation voltage Vc1 is a first pixel voltage Vp1 minus a voltage value of the internal electric field Ei (ie, Vp1-Vi), and the second compensation voltage Vc2 is a second pixel.
  • the voltage Vp2 subtracts the voltage value of the internal electric field Ei (i.e., Vp2-Vi).
  • FIG. 13 is a waveform diagram of the first compensation voltage Vc1 and the second compensation voltage Vc2 in the second embodiment.
  • the internal electric field Ei' is opposite to the internal electric field Ei of the first embodiment.
  • the external electric field E1 formed is in the same direction as the internal electric field Ei' such that the actual first pixel voltage Vp1 is away from the common voltage VCOM.
  • the formed external electric field E2 is inverted with the internal electric field Ei such that the actual second pixel voltage Vp2 is close to the common voltage VCOM.
  • the first compensation voltage Vc1 is the first pixel voltage Vp1 plus the voltage value of the internal electric field Ei (ie, Vp1+Vi), and the second compensation voltage Vc2 is the second pixel.
  • the voltage Vp2 is added to the voltage value of the internal electric field Ei (i.e., Vp2+Vi).
  • the difference between the actual first pixel voltage and the actual second pixel voltage with respect to the common voltage VCOM can be made equal by adjusting the common voltage VCOM. That is, in the above step S20, modifying to provide a compensation common voltage VcCOM at the common electrode 100 according to the gray scale, and providing a first pixel voltage Vp1 and a second pixel voltage Vp2 at the pixel electrode, the compensation The voltage VcCOM is used to compensate the internal electric field such that the difference between the first pixel voltage Vp1 and the second pixel voltage Vp2 with respect to the compensation common voltage VcCOM is equal.
  • the compensation common voltage VcCOM is the common voltage VCOM plus the built-in voltage Vi.
  • the compensation common voltage VcCOM is the common voltage VCOM minus the built-in voltage Vi.
  • the present invention is not limited to the above two adjustment methods, and the first pixel voltage Vp1, the second pixel voltage Vp2, and the common voltage VCOM may be simultaneously adjusted.
  • the first compensation voltage Vc1, the second compensation voltage Vc2 and the compensation common voltage VcCOM can be adjusted by a common gate driver and a source driver in combination with a resistor or a digital-to-analog conversion (DAC) integrated circuit.
  • DAC digital-to-analog conversion
  • the present invention solves the above problem from the reverse phase by deliberately creating charge accumulation, and then adjusting the first pixel voltage Vp1 and the second pixel voltage Vp2 to become the first compensation voltage Vc1 and the second compensation voltage Vc2. To achieve the correct display of the picture. Accordingly, on the one hand, the influence of the charge residue on the image is eliminated, and on the other hand, even if there is some deviation between the voltage difference between the common electrode VCOM and the pixel electrode 200, there is no influence of the cumulative variation of the moving impurity ions 10. , causing an abnormal display of the screen.

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Description

液晶显示器的驱动方法 技术领域
本发明是有关于一种驱动方法，且特别是有关于一种液晶显示器的驱动方法。
 背景技术
请参照图1，图1为现有的液晶显示器的剖面示意图。目前液晶显示器都采用交流的电压来进行驱动，所以在液晶层两端会有两个电极，一边为共电极100，一边为像素电极200，液晶内部会存在正负的杂质离子10。
请参照图2，图2为现有交流驱动时的驱动电压波型图。在固定的画面时，通过在像素电极200加入不同的像素电压Vp1及Vp2，使得共电极100的电压VCOM与像素电极200在不同的帧时，形成相反且电压差相等的电场，来实现对液晶的交流电压驱动。请参照图3及图4，图3 为加入Vp1时的杂质离子移动示意图、图4 为加入Vp2时的杂质离子移动示意图。当加入Vp1的电压时，即Vp1<VCOM，正负离子移动的距离为d。当加如Vd2时，即Vp2>VCOM，正负的杂质离子也会再反向移动d的距离，因此内部的杂质离子10不会发生聚集。
一般来说，共电极100为固定不变的电压，然而也有为了实现某些画质的改善或实现其他的驱动架构，而将共电极设为变动的。但无论是哪种情况，都要求在某一灰阶时，夹在电极两端的压差的绝对值要尽量相等。请参照图5及图6，图5为两端的压差不等的驱动电压波型图、图6为加入图5所示的电压的杂质离子移动示意图。当Vp1、Vp2与VCOM的绝对值差不相等，造成正负离子移动的距离d1、d2不相等，则会导致液晶层内的杂质离子向两边聚集（也叫电荷残留），如图6所示。
当有较多的正负杂质离子10分别附着到共电极100及像素电极200上的配向膜上(未图示)时，就会形成的一个内建电压Vi。据此，当提供某一灰阶对应的Vp1及Vp2时，Vp1及Vp2与VCOM的差值就会受到Vi的影响，液晶分子的倾斜角度在就会有变化。因此会产生画面闪烁(Flicker)或是颜色有偏差的问题。而且杂质离子附着后会一直贴在配向膜上，无法恢复，所以这样的异常通常是不可恢复，不可维修的，即我们所说的液晶极化的问题。
所以，为了保证液晶不被极化，我们需要一个稳定的共电极电压，来与像素电压形成相等的绝对值压差，然而对于整个面板而言，很难做到每个区域的共电极是一致的。所以目前有技术解决方式均是在去减少这种电荷累积造成的问题，但在长时间的使用后，还是会出现上述问题。
 技术问题
本发明的目的在于提供一种液晶显示器的驱动方法，其故意制造出电荷残留，再通过调整驱动电压，解决了前述电荷残留的问题。
 技术解决方案
为达上述的目的，本发明采取以下技术方案。一种液晶显示器的驱动方法，所述液晶显示器包括一共电极、一像素电极、一液晶层，位于所述共电极及所述像素电极之间，且具有若干个杂质离子、及一像素，用于显示一灰阶。所述驱动方法包括：分离所述若干杂质离子至所述共电极及像素电极，以于所述液晶层形成一内部电场；及根据所述灰阶在所述共电极提供一共电压，及在所述像素电极提供一第一补偿电压及一第二补偿电压，所述第一补偿电压及第二补偿电压用于补偿所述内部电场，使得所述第一补偿电压及第二补偿电压相对于所述共电压的差值相等。
优选地，分离所述若干杂质离子是在所述共电极提供一偏移共电压，及在所述像素电极提供一第一电压及一第二电压，使得所述第一电压及第二电压相对于所述偏移共电压的差值不相等。具体来说，所述第二电压大于所述第一电压，且所述偏移共电压介于所述第一电压及所述第二电压之间。
优选地，所述偏移共电压与所述第一电压的差值大于所述偏移共电压与所述第二电压的差值。所述内部电场的方向为从所述像素电极朝向所述共电极。此外，所述第一补偿电压为一第一像素电压减掉所述内部电场的电压值，所述第二补偿电压为一第二像素电压减掉所述内部电场的电压值。
优选地，所述偏移共电压与所述第一电压的差值小于所述偏移共电压与所述第二电压的差值。所述内部电场的方向为从所述共电极朝向所述像素电极。此外，所述第一补偿电压为一第一像素电压加上所述内部电场的电压值，所述第二补偿电压为一第二像素电压加上所述内部电场的电压值。
值得一提的是，所述第一补偿电压及第二补偿电压是通过电阻或数模转换集成电路进行调整。
相较于现有技术，本发明从反相来解决这上述问题，其通过故意制造出电荷累积，再通过提供第一补偿电压及第二补偿电压，实现画面的正确显示。据此，一方面消除电荷残留对影像的影响，另一方面即使共电极及像素电极的电压差有一些偏差，也不会再有移动的杂质离子的累积加大偏差所导致的影响，导致画面的异常显示。
 有益效果
本发明从反相来解决这上述问题，其通过故意制造出电荷累积，再通过提供第一补偿电压及第二补偿电压，实现画面的正确显示。据此，一方面消除电荷残留对影像的影响，另一方面即使共电极及像素电极的电压差有一些偏差，也不会再有移动的杂质离子的累积加大偏差所导致的影响，导致画面的异常显示。
附图说明
图1为现有的液晶显示器的剖面示意图。
图2为现有交流驱动时的驱动电压波型图。
图3为加入Vp1时的杂质离子移动示意图。
图4为加入Vp2时的杂质离子移动示意图。
图5为两端的压差不等的驱动电压波型图。
图6为加入图5所示的电压的杂质离子移动示意图。
图7为本发明的第一优选实施例的液晶显示器示意图。
图8为本发明的液晶显示器的驱动方法的流程图。
图9为第一实施例提供的驱动电压波型图。
图10为第二实施例提供的驱动电压波型图。
图11为第二优选实施例的液晶显示器示意图。
图12为第一实施例中的第一补偿电压及第二补偿电压的波型图。
图13为第二实施例中的第一补偿电压及第二补偿电压的波型图。
 本发明的最佳实施方式
请参照图7及图8，图7为本发明的第一优选实施例的液晶显示器示意图、图8为本发明的液晶显示器的驱动方法的流程图。所述液晶显示器包括若干个像素单元1000、若干个共电极100、若干个像素电极200、一液晶层150。为清楚表示，图7仅绘示出单一像素1000、单一共电极100及单一像素电极200。共电极100及像素电极200面对液晶层150的表面均有一层配向膜120。液晶层150位于所述共电极100及所述像素电极200之间，且具有若干个杂质离子10。所述像素1000用于显示一灰阶。
如图8所示，所述驱动方法包括步骤S10及S20。
在步骤S10中，分离所述若干杂质离子10至所述共电极100及像素电极200，以于所述液晶层150形成一内部电场Vi。请参照图9，图9为第一实施例提供的驱动电压波型图。在此第一优选实施例中，分离所述若干杂质离子10是通过在所述共电极100提供一偏移共电压VCOM’，及在所述像素电极200提供一第一电压Va及一第二电压Vb，使得所述第一电压Va及第二电压Vb相对于所述偏移共电压VCOM’的差值不相等。具体来说，所述第二电压Vb大于所述第一电压Va，且所述偏移共电压VCOM’介于所述第一电压Va及所述第二电压Vb之间。具体而言，即可通过公之的闸极驱动器及源极驱动器并配合电阻或数模转换(DAC)集成电路进行调整，然而本发明不限于此种方式实施。
在第一优选实施例中，所述偏移共电压VCOM’与所述第一电压Va的差值大于所述偏移共电压VCOM’与所述第二电压Vb的差值。即偏移共电压VCOM’靠近所述第二电压Vb，这将使得正负的杂质离子10逐渐聚集到共电极100及像素电极200上的配向膜120，如图7所示。由于偏移共电压VCOM’十分靠近第二电压Vb，因此正的杂质离子10皆往像素电极200聚集、而负的杂质离子10皆往共电极100聚集，在聚集的过程中杂质离子10建立了内部电场Ei，并逐渐达到了最大值，即形成了电荷残留。因此所述内部电场Ei变成了一个定值。所述内部电场Ei的方向为从所述像素电极200朝向所述共电极100。值得一提的是，所述内部电场Ei乘上液晶层150的厚度D则为内部电场Ei在共电极100及像素电极200两端建立的内建电压Vi。同样地，所述内建电压Vi也成为一个定值。
请参照图10及图11，图10为第二实施例提供的驱动电压波型图、图11为第二优选实施例的液晶显示器示意图。同样地，在第二优选实施例中，所述偏移共电压VCOM’与所述第一电压Va的差值小于所述偏移共电压VCOM’与所述第二电压Vb的差值。即偏移共电压VCOM’靠近所述第一电压Va，这将使得正负的杂质离子10逐渐聚集到共电极100及像素电极200上的配向膜120，如图11所示。由于偏移共电压VCOM’十分靠近第一电压Va，因此正的杂质离子10皆往共电极100聚集、而负的杂质离子10皆往像素电极200聚集，在聚集的过程中杂质离子10建立了内部电场Ei，并逐渐达到了最大值，即形成了电荷残留。因此所述内部电场Ei变成了一个定值。所述内部电场Ei的方向为从所述共电极100朝向所述像素电极200。值得一提的是，所述内部电场Ei乘上液晶层150的厚度D则为内部电场Ei在共电极100及像素电极200两端建立的内建电压Vi。同样地，所述内建电压Vi也成为一个定值。
在步骤S20中，根据所述灰阶在所述共电极100提供一共电压VCOM，及在所述像素电极200提供一第一补偿电压Vc1及一第二补偿电压Vc2，所述第一补偿电压Vc1及第二补偿电压Vc2用于补偿所述内部电场Ei，使得所述第一补偿电压Vc1及第二补偿电压Vc2相对于所述共电压VCOM的差值相等。
请参考图12，图12为第一实施例中的第一补偿电压Vc1及第二补偿电压Vc2的波型图。在第一实施例中，如果该画素1000显示该灰阶所需提供的画素电压为第一像素电压Vp1及第二像素电压Vp2，且Vp1与Vp2相对于共电压VCOM的差值相等。请再参照图7，当画素1000被提供第一像素电压Vp1时，所形成的外部电场E1与内部电场Ei反向，如此使得实际的第一像素电压Vp1靠近共电压VCOM。当画素1000被提供第二像素电压Vp2时，所形成的外部电场E2与内部电场Ei同向，如此使得实际的第二像素电压Vp2远离共电压VCOM。因此，为了补偿内建电压Vi，所述第一补偿电压Vc1为第一像素电压Vp1减掉所述内部电场Ei的电压值(即Vp1-Vi)，所述第二补偿电压Vc2为第二像素电压Vp2减掉所述内部电场Ei的电压值(即Vp2-Vi)。
请参考图13，图13为第二实施例中的第一补偿电压Vc1及第二补偿电压Vc2的波型图。同样地，在第二实施例中，由于内部电场Ei’与第一实施例的内部电场Ei方向相反。请再参照图11，当画素1000被提供第一像素电压Vp1时，所形成的外部电场E1与内部电场Ei’同向，如此使得实际的第一像素电压Vp1远离共电压VCOM。当画素1000被提供第二像素电压Vp2时，所形成的外部电场E2与内部电场Ei反向，如此使得实际的第二像素电压Vp2靠近共电压VCOM。因此，为了补偿内建电压Vi，所述第一补偿电压Vc1为第一像素电压Vp1加上所述内部电场Ei的电压值(即Vp1+Vi)，所述第二补偿电压Vc2为第二像素电压Vp2加上所述内部电场Ei的电压值(即Vp2+Vi)。
除了上述调整方式之外，还可通过调整共电压VCOM使得实际的第一像素电压与实际的第二像素电压相对于所述共电压VCOM的差值相等。即在上述步骤S20中，修改成根据所述灰阶在所述共电极100提供一补偿共电压VcCOM，及在所述像素电极提供第一像素电压Vp1及第二像素电压Vp2，所述补偿共电压VcCOM用于补偿所述内部电场，使得所述第一像素电压Vp1及第二像素电压Vp2相对于所述补偿共电压VcCOM的差值相等。请再叁考图12，在第一实施例中，所述补偿共电压VcCOM为共电压VCOM加上内建电压Vi。请再叁考图13，在第二实施例中，所述补偿共电压VcCOM为共电压VCOM减掉内建电压Vi。然而，本发明并不限于上述两种调整方式，亦可同时调整第一像素电压Vp1、第二像素电压Vp2及共电压VCOM。
值得一提的是，上述第一补偿电压Vc1、第二补偿电压Vc2及补偿共电压VcCOM可通过公之的闸极驱动器及源极驱动器并配合电阻或数模转换(DAC)集成电路进行调整，然而本发明不限于此种方式实施。
综上所述，本发明从反相来解决这上述问题，其通过故意制造出电荷累积，再通过调整第一像素电压Vp1及第二像素电压Vp2成为第一补偿电压Vc1及第二补偿电压Vc2，以实现画面的正确显示。据此，一方面消除电荷残留对影像的影响，另一方面即使共电极VCOM及像素电极200的电压差有一些偏差，也不会再有移动的杂质离子10的累积加大偏差所导致的影响，导致画面的异常显示。
虽然本发明已用优选实施例揭露如上，然其并非用以限定本发明，本发明所属技术领域的技术人员，在不脱离本发明的精神和范围内，当可作各种的更动与润饰，因此本发明的保护范围当视后附的权利要求书所界定的为准。
 本发明的实施方式
工业实用性
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Claims (15)

  1. 一种液晶显示器的驱动方法，所述液晶显示器包括一共电极、一像素电极、一液晶层，位于所述共电极及所述像素电极之间，且具有若干个杂质离子、及一像素，用于显示一灰阶，所述驱动方法其特征在于，包括：
    分离所述若干杂质离子至所述共电极及像素电极，以于所述液晶层形成一内部电场；及
    根据所述灰阶在所述共电极提供一补偿共电压，及在所述像素电极提供一第一像素电压及一第二像素电压，所述补偿共电压用于补偿所述内部电场，使得所述第一像素电压及第二像素电压相对于所述补偿共电压的差值相等。
  2. 根据权利要求1所述的液晶显示器的驱动方法，其特征在于：分离所述若干杂质离子是在所述共电极提供一偏移共电压，及在所述像素电极提供一第一电压及一第二电压，使得所述第一电压及第二电压相对于所述偏移共电压的差值不相等。
  3. 根据权利要求2所述的液晶显示器的驱动方法，其特征在于，所述第二电压大于所述第一电压，且所述偏移共电压介于所述第一电压及所述第二电压之间，且所述偏移共电压与所述第一电压的差值大于所述偏移共电压与所述第二电压的差值，则所述补偿共电压为一共电压加上所述内建电压。
  4. 根据权利要求2所述的液晶显示器的驱动方法，其特征在于，所述第二电压大于所述第一电压，且所述偏移共电压介于所述第一电压及所述第二电压之间，且所述偏移共电压与所述第一电压的差值小于所述偏移共电压与所述第二电压的差值，则所述补偿共电压为一共电压减掉所述内建电压。
  5. 根据权利要求2所述的液晶显示器的驱动方法，其特征在于，所述补偿共电压是通过电阻或数模转换集成电路进行调整。
  6. 一种液晶显示器的驱动方法，所述液晶显示器包括一共电极、一像素电极、一液晶层，位于所述共电极及所述像素电极之间，且具有若干个杂质离子、及一像素，用于显示一灰阶，所述驱动方法其特征在于，包括：
    分离所述若干杂质离子至所述共电极及像素电极，以于所述液晶层形成一内部电场；及
    根据所述灰阶在所述共电极提供一共电压，及在所述像素电极提供一第一补偿电压及一第二补偿电压，所述第一补偿电压及第二补偿电压用于补偿所述内部电场，使得所述第一补偿电压及第二补偿电压相对于所述共电压的差值相等。
  7. 根据权利要求6所述的液晶显示器的驱动方法，其特征在于：分离所述若干杂质离子是在所述共电极提供一偏移共电压，及在所述像素电极提供一第一电压及一第二电压，使得所述第一电压及第二电压相对于所述偏移共电压的差值不相等。
  8. 根据权利要求7所述的液晶显示器的驱动方法，其特征在于，所述第二电压大于所述第一电压，且所述偏移共电压介于所述第一电压及所述第二电压之间。
  9. 根据权利要求8所述的液晶显示器的驱动方法，其特征在于，所述偏移共电压与所述第一电压的差值大于所述偏移共电压与所述第二电压的差值。
  10. 根据权利要求9所述的液晶显示器的驱动方法，其特征在于，所述内部电场的方向为从所述像素电极朝向所述共电极。
  11. 根据权利要求10所述的液晶显示器的驱动方法，其特征在于，所述第一补偿电压为一第一像素电压减掉所述内部电场的电压值，所述第二补偿电压为一第二像素电压减掉所述内部电场的电压值。
  12. 根据权利要求8所述的液晶显示器的驱动方法，其特征在于，所述偏移共电压与所述第一电压的差值小于所述偏移共电压与所述第二电压的差值。
  13. 根据权利要求12所述的液晶显示器的驱动方法，其特征在于，所述内部电场的方向为从所述共电极朝向所述像素电极。
  14. 根据权利要求13所述的液晶显示器的驱动方法，其特征在于，所述第一补偿电压为一第一像素电压加上所述内部电场的电压值，所述第二补偿电压为一第二像素电压加上所述内部电场的电压值。
  15. 根据权利要求6所述的液晶显示器的驱动方法，其特征在于：所述第一补偿电压及第二补偿电压是通过电阻或数模转换集成电路进行调整。
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US20140035958A1 (en) 2014-02-06

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