WO2018126753A1 - 一种源极驱动装置、其极性反转控制方法及液晶显示装置 - Google Patents

一种源极驱动装置、其极性反转控制方法及液晶显示装置 Download PDF

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Publication number
WO2018126753A1
WO2018126753A1 PCT/CN2017/105504 CN2017105504W WO2018126753A1 WO 2018126753 A1 WO2018126753 A1 WO 2018126753A1 CN 2017105504 W CN2017105504 W CN 2017105504W WO 2018126753 A1 WO2018126753 A1 WO 2018126753A1
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Prior art keywords
signal
polarity
control
polarity inversion
control unit
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English (en)
French (fr)
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梁恒镇
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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Priority to US16/066,754 priority Critical patent/US11308903B2/en
Publication of WO2018126753A1 publication Critical patent/WO2018126753A1/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
    • G09G3/3614—Control of polarity reversal in general
    • 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
    • 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 disclosure relates to the field of liquid crystal display technology, and in particular, to a source driving device, a polarity inversion control method thereof, and a liquid crystal display device.
  • a thin film transistor liquid crystal display utilizes optical anisotropy and birefringence characteristics of liquid crystal molecules to display an image.
  • the TFT-LCD generates an electric field according to the video signal through the surface electrode of the substrate, and the electric field changes the arrangement direction of the liquid crystal molecules, thereby controlling the light transmittance of the liquid crystal cell, thereby realizing image display.
  • a TFT-LCD is driven by an alternating voltage polarity method. In such a driving method, the voltage polarity is caused to alternate between adjacent liquid crystal cells and between successive frame periods in order to lower the deterioration of the liquid crystal, so that the liquid crystal can maintain normal characteristics for a long time, thereby maintaining normal display for a long time. If either of the two polarities of the data voltage is dominantly provided for a longer period of time, there is a DC signal (DC) residual. After a certain period of time, the residual DC signal will affect the liquid crystal characteristics, resulting in abnormal display and signal residual.
  • DC DC signal
  • TV television
  • the TV Scaler has two-dimensional interlaced interleaving (2D De-Interlace) mode and three-dimensional interlaced interleaving (3D).
  • De-Interlace two-dimensional interlaced interleaving
  • 2D De-Interlace the Line Buffer function is used, in which the signals of the Interlace lines are calculated by using the signals of the front and rear lines, so that the storage signal amount is small.
  • 3D De-Interlace mode the signal for obtaining the Interlace line is calculated by comparing the frame signals, thus requiring a larger storage amount of memory cells for storing signals of at least two frames.
  • the display of the liquid crystal display needs to be driven by positive and negative voltages, but due to the difference in the processing signal of the front end system, a deviation between the positive and negative voltages which should be the same absolute value is caused, so that the length is long.
  • the residual DC signal (DC) at the time causes the liquid crystal to be polarized, which in turn causes image sticking.
  • embodiments of the present disclosure provide a source driving device, a polarity inversion control method thereof, and a liquid crystal display device capable of at least partially alleviating or even eliminating one or more of the above mentioned problems.
  • a source driving device including a positive and negative polarity inversion control unit, and a polarity signal control unit.
  • the positive and negative polarity inversion control unit includes: a first channel selection circuit, a negative voltage channel and a positive voltage channel, which are sequentially connected, and a second channel selection circuit.
  • the first channel selection circuit is respectively connected to two signal input terminals, and the second channel selection circuit is respectively connected to two signal output terminals.
  • the polarity signal control unit includes: an input configured to receive a polarity inversion control signal, a control end configured to receive a trigger control signal, and control with the first channel selection circuit and the second channel selection circuit, respectively The output connected to the end.
  • the polarity signal control unit is configured to output the received polarity inversion control signal, and after receiving the valid trigger control signal, perform polarity inversion on the polarity inversion control signal to be output, and The polarity inversion control signal to be output is again inverted in polarity after receiving the valid trigger control signal again.
  • polarity transformation refers to inverting a positive signal to a corresponding negative signal and The negative signal is inverted to the corresponding positive signal, or the high signal is inverted to a low signal, and the low signal is inverted to a high signal.
  • the term "effective" trigger control signal as used throughout this disclosure refers to a trigger control signal that causes the polarity signal control unit to reverse the polarity inversion control signal.
  • the "active" trigger control signal can be a high level signal or a low level signal depending on the usage.
  • the polarity signal control unit is disposed in one-to-one correspondence with the positive and negative polarity inversion control unit, and each of the The input of the polarity signal control unit is connected to the same polarity inversion control signal input.
  • the above-mentioned source driving device provided by the embodiment of the present disclosure further includes a shift controller.
  • the shift controller includes an input configured to receive a trigger signal, and a plurality of outputs connected in one-to-one correspondence with the control terminals of each of the polarity signal control units.
  • the shift controller is configured to sequentially output a valid trigger control signal to the control terminals of each of the polarity signal control units in sequence when receiving a valid trigger signal.
  • the above-mentioned source driving device provided by the embodiment of the present disclosure further includes a random controller.
  • the random controller includes an input configured to receive a trigger signal, and a plurality of outputs connected in one-to-one correspondence with the control terminals of each of the polarity signal control units.
  • the random controller is configured to output a valid trigger control signal to only one control terminal of the polarity signal control unit at the same time in a random order upon receiving a valid trigger signal, and each time a valid signal is received A valid trigger control signal is sequentially output to the control terminals of all the polarity signal control units in a random sequence in one cycle after the trigger signal.
  • the control end of the polarity signal control unit receives an effective trigger control signal every 2n frame time, and n is positive. Integer.
  • an embodiment of the present disclosure further provides a liquid crystal display device including any of the above-described source driving devices provided by the embodiments of the present disclosure.
  • an embodiment of the present disclosure further provides a polarity inversion control method of a source driving device.
  • the source driving device includes a positive and negative polarity inversion control unit, and a polarity signal control unit.
  • the positive and negative polarity inversion control unit includes: a first channel selection circuit, a negative voltage channel and a positive voltage channel, which are sequentially connected, and a second channel selection circuit.
  • the first channel selection circuit is respectively connected to two signal input terminals
  • the second channel selection circuit is respectively connected to two signal output terminals.
  • the polarity signal control unit includes: an input configured to receive a polarity inversion control signal, a control end configured to receive a trigger control signal, and control with the first channel selection circuit and the second channel selection circuit, respectively The output connected to the end.
  • the polarity inversion control method includes: outputting, by the polarity signal control unit, the received polarity inversion control signal to a control end of the connected first channel selection circuit and second channel selection circuit, After receiving the valid trigger control signal, the polarity inversion control signal to be output is subjected to polarity inversion, and after the effective trigger control signal is received again, the polarity inversion control signal to be output is again subjected to polarity Sexual inversion.
  • the polarity signal control unit is configured in one-to-one correspondence with the positive and negative polarity inversion control unit, and each The input end of the polarity signal control unit is connected to the same polarity inversion control signal input end.
  • the polarity inversion control method further includes receiving, by each of the polarity signal control units, the polarity inversion control signal outputted by the input terminal of the same polarity inversion control signal.
  • the source driving device further includes a shift controller.
  • the shift controller includes an input configured to receive a trigger signal, and a plurality of outputs coupled in one-to-one correspondence with inputs of each of the polarity signal control units.
  • the polarity inversion control method further includes, when the valid trigger signal is received by the shift controller, sequentially outputting a valid trigger control signal to the input ends of each of the polarity signal control units in sequence. .
  • the source driving device further includes a random controller.
  • the random controller includes an input configured to receive a trigger signal, and a plurality of outputs connected in one-to-one correspondence with the inputs of each of the polarity signal control units.
  • the polarity inversion control method further includes: when the valid controller receives the valid trigger signal, outputting valid to only one input terminal of the polarity signal control unit at the same time in a random order. The control signal is triggered, and the valid trigger control signal is output to the input terminals of all the polarity signal control units in a random sequence in each cycle after receiving the valid trigger signal.
  • the foregoing polarity inversion control method provided by the embodiment of the present disclosure further includes: receiving, by the polarity signal control unit, the trigger control signal every 2n frame time, where n is a positive integer .
  • Embodiments of the present disclosure provide a source driving device, a polarity inversion control method thereof, and a liquid crystal display device.
  • the polarity signal control unit is added, and the output end of the polarity signal control unit is respectively connected to the first pass in the positive and negative polarity inversion control unit
  • the channel selection circuit is connected to the control terminal of the second channel selection circuit.
  • the polarity inversion control signal needs to pass through the polarity signal control unit before being input to the control terminals of the above two circuits.
  • the polarity inversion of the polarity inversion control signal output by the polarity signal control unit is controlled by a trigger control signal input to the control terminal of the polarity signal control unit.
  • the polarity signal control unit After receiving the valid trigger control signal at the control end of the polarity signal control unit, the polarity signal control unit outputs the polarity inversion control signal to be output after polarity inversion, and is in polarity. After the control terminal of the signal control unit receives the valid trigger control signal again, the polarity signal control unit will again output the polarity inversion control signal to be output after polarity inversion.
  • the positive and negative polarity inversion control unit controls the polarity of the output signal according to the received polarity inversion control signal, thereby effectively avoiding the DC signal residual problem that may exist in the 2D De-Interlace mode, and because the front end signal quality is not Good residual DC signal residual problem or DC signal residual problem caused by other reasons, thus eliminating the residual image caused by DC residual.
  • FIG. 1 is a schematic structural diagram of a source driving device according to an embodiment of the present disclosure
  • FIG. 2 is a schematic structural view of a typical source driving device
  • FIG. 3 is a timing diagram of a polarity signal control unit in a source driving device according to an embodiment of the present disclosure
  • FIG. 4 is a partial schematic structural diagram of a source driving device according to an embodiment of the present disclosure.
  • FIG. 5 is a partial schematic structural diagram of a source driving device according to an embodiment of the present disclosure.
  • a source driving device includes a positive and negative polarity inversion control unit 100, and a polarity signal control unit 200.
  • the positive and negative polarity inversion control unit 100 includes a first channel selection circuit 101, a positive voltage channel 102, and a negative voltage channel 103, which are sequentially connected, and a second channel selection circuit 104.
  • the first channel selection circuit 101 is connected to the two signal input terminals a and b, respectively, and the second channel selection circuit 104 is connected to the two signal output terminals A and B, respectively.
  • the polarity signal control unit 200 includes: an input configured to receive the polarity inversion control signal POL, a control terminal configured to receive the trigger control signal Ctl, and a first channel selection circuit 101 and a second channel selection circuit 104, respectively The output connected to the console.
  • the polarity signal control unit 200 is configured to output the received polarity inversion control signal POL, assuming that the polarity inversion control signal to be output is POLC, after receiving the valid trigger control signal Ctl, the pole to be output
  • the polarity inversion control signal POLC performs polarity inversion, and again performs polarity inversion on the polarity inversion control signal POLC to be output after receiving the valid trigger control signal Ctl again.
  • the polarity signal control unit 200 is added, and the output ends thereof are respectively selected from the first channel selection circuit 101 and the second channel in the positive and negative polarity inversion control unit 100.
  • the control terminals of circuit 104 are connected.
  • the polarity inversion control signal POL in the source driving device provided by the embodiment of the present disclosure needs to go through.
  • the polarity signal control unit 200 is not input to the control terminals of the above two circuits.
  • the polarity inversion of the polarity inversion control signal POLC output by the polarity signal control unit 200 is controlled by the trigger control signal Ctl input to the control terminal of the polarity signal control unit 200. Specifically, after the control terminal of the polarity signal control unit 200 receives the valid trigger control signal Ctl, the polarity signal control unit 200 reverses the polarity inversion control signal POL to be output, and outputs the polarity. And after the control terminal of the polarity signal control unit 200 receives the valid trigger control signal Ctl again, the polarity signal control unit 200 again reverses the polarity inversion control signal POLV to be output and outputs the polarity.
  • the positive and negative polarity inversion control unit 100 controls the polarity of the output signal according to the received polarity inversion control signal, thereby effectively avoiding a DC signal residual problem that may exist in the 2D De-Interlace mode, and due to the front end signal quality.
  • the positive and negative polarity reversal control unit 100 may adopt a conventional structure, and therefore, the internal structure of each circuit in the positive and negative polarity reversal control unit 100 is not here. Do it in detail.
  • the control terminal of the polarity signal control unit 200 receives a trigger every 2n frame time.
  • the control signal Ctl is performed to perform polarity inversion conversion, wherein n is a positive integer, that is, the period of the trigger control signal Ctl can be minimum equal to two frame times, that is, the trigger control signal Ctl can be input once every two frames.
  • the positive and negative polarity reversal control unit 100 since all the data lines in the liquid crystal display panel need to be driven, the positive and negative polarity reversal control unit 100 generally has a plurality of pairs, each pair of positive and negative electrodes.
  • the sex inversion control unit 100 outputs a data signal to two adjacent data lines.
  • only one polarity signal control unit 200 may be provided in the source driving device, and the first channel selection circuit 101 and the second channel selection circuit in all of the positive and negative polarity inversion control units 100 The control terminals of 104 are connected.
  • the polarity signal control unit 200 can be set in one-to-one correspondence with the positive and negative polarity inversion control unit 100, that is, set.
  • the plurality of polarity signal control units 200, and the input terminal POL of each polarity signal control unit 200 can be connected to the same polarity inversion control signal input terminal P, that is, the same polarity inversion control signal POL is received.
  • the control terminal of each polarity signal control unit 200 can receive a valid trigger control signal Ctl at different times so that the polarity change in the display panel occurs in a single direction (for example, column direction), which is not easy to detect. The difference in brightness when the polarity is reversed.
  • the triggering control signal Ctl can be input to the different polarity signal control unit 200 in a timely manner by the following manner.
  • the shift controller 300 is added to the source drive.
  • the shift controller 300 includes an input configured to receive the trigger signal CTL, and a plurality of outputs connected in one-to-one correspondence with the control terminals of the respective polarity signal control units 200.
  • the shift controller 300 is configured to sequentially output a valid trigger control signal Ctl to the control terminals of the respective polarity signal control units 200 in order when the valid trigger signal CTL is received.
  • the sequential scanning can be realized by the scheme shown in FIG. 4, that is, the shift controller 300 sequentially outputs the effective trigger control signal Ctl to the control terminals connected to the respective polarity signal control units 200, so that the polarity changes in the display panel. This occurs sequentially in a single direction (for example, a column direction) so that a change in polarity in the display panel occurs in a single direction (for example, a column direction), so that the difference in luminance when the polarity is reversed is not easily perceived.
  • the random controller 400 is added to the source driver.
  • the random controller 400 includes an input configured to receive the trigger signal CTL, and a plurality of outputs connected in one-to-one correspondence with the control terminals of the respective polarity signal control units 200.
  • the random controller 400 is configured to output a valid trigger control signal Ctl to only the control terminal of one polarity signal control unit 200 at the same time in a random order upon receiving the valid trigger signal CTL, and is valid every time it is received.
  • a valid trigger control signal Ctl is sequentially output to the control terminals of all the polarity signal control units 200 in a random sequence in one cycle after the trigger signal CTL.
  • the random scan can be realized by the scheme shown in FIG. 5, that is, the random control controller 400 randomly outputs the effective trigger control signal Ctl to the control terminal connected to each polarity signal control unit 200, so that the polarity change in the display panel is Random occurrences in a single direction (eg, column direction) such that changes in polarity in the display panel occur in a single direction (eg, column In the direction), it is less noticeable that the difference in brightness when the polarity is reversed.
  • the embodiment of the present disclosure further provides a polarity inversion control method of a source driving device. Since the principle of solving the problem is similar to the foregoing one of the source driving devices, the implementation of the device can be referred to the implementation of the method, and the method is repeated. It will not be repeated here.
  • the source driving device includes a positive and negative polarity inversion control unit 100, and a polarity signal.
  • Control unit 200 The positive and negative polarity inversion control unit 100 includes a first channel selection circuit 101, a positive voltage channel 102, and a negative voltage channel 103, which are sequentially connected, and a second channel selection circuit 104.
  • the first channel selection circuit 101 is connected to the two signal inputs, respectively, and the second channel selection circuit 104 is connected to the two signal outputs, respectively.
  • the polarity signal control unit 200 includes: an input configured to receive the polarity inversion control signal, a control terminal configured to receive the trigger control signal, and a control terminal respectively coupled to the first channel selection circuit 101 and the second channel selection circuit 104 Connected output.
  • the foregoing polarity inversion control method includes:
  • the received polarity inversion control signal is output to the control terminals of the connected first channel selection circuit 101 and second channel selection circuit 104 by the polarity signal control unit 200, after receiving the valid trigger control signal,
  • the polarity inversion control signal to be output is subjected to polarity inversion, and the polarity inversion control signal to be output is again inverted in polarity after receiving the valid trigger control signal again.
  • the polarity signal control unit 200 may be disposed in one-to-one correspondence with the positive and negative polarity inversion control unit 100, and the input ends of the respective polarity signal control units 200 are The same polarity inversion control signal input terminal is connected.
  • the above polarity inversion control method provided by the embodiment of the present disclosure further includes: receiving, by each polarity signal control unit 200, a polarity inversion control signal outputted by the same polarity inversion control signal input end.
  • the source driving device may further include a shift controller 300 as shown in FIG. 4 .
  • the shift controller 300 includes an input configured to receive a trigger signal, and a plurality of outputs connected in one-to-one correspondence with the control terminals of the respective polarity signal control units 200.
  • the above polarity inversion control method further includes: when the effective trigger signal is received by the shift controller 300, sequentially outputting valid to the control end of each polarity signal control unit 200 in order. Trigger control signal.
  • the source driving device may further include a random controller 400 as shown in FIG. 5 .
  • the random controller 400 includes an input configured to receive a trigger signal, and a plurality of outputs connected in one-to-one correspondence with the control terminals of the respective polarity signal control units 200.
  • the foregoing polarity inversion control method further includes: when receiving the valid trigger signal by the random controller 400, only to the control end of the one polarity signal control unit 200 at the same time in a random order.
  • a valid trigger control signal is output, and a valid trigger control signal is sequentially output to the control terminals of all polarity signal control units 200 in a random sequence every time a valid trigger signal is received.
  • the above polarity inversion control method provided by the embodiment of the present disclosure may further include receiving, by the polarity signal control unit 200, a trigger control signal every 2n frame time, where n is a positive integer.
  • the embodiment of the present disclosure further provides a liquid crystal display device including the above-described source driving device provided by the embodiment of the present disclosure.
  • the liquid crystal display device can be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • a display function such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • the display device reference may be made to the embodiment of the source driving device described above, and the repeated description is omitted.
  • a polarity signal control unit is added to the source driving device, and an output terminal of the polarity signal control unit is added.
  • the first channel selection circuit and the control terminal of the second channel selection circuit are respectively connected to the positive and negative polarity inversion control units.
  • the polarity inversion control signal needs to pass through the polarity signal control unit before being input to the control terminals of the above two circuits.
  • the polarity inversion of the polarity inversion control signal output by the polarity signal control unit is controlled by a trigger control signal input to the control terminal of the polarity signal control unit.
  • the polarity signal control unit After receiving the valid trigger control signal at the control end of the polarity signal control unit, the polarity signal control unit outputs the polarity inversion control signal to be output after polarity inversion, and is in polarity.
  • the control terminal of the signal control unit 200 receives the valid trigger control signal Ctl again, the polarity signal control unit 200 again reverses the polarity inversion control signal POL to be output and outputs the polarity.
  • the positive and negative polarity inversion control unit controls the polarity of the output signal according to the received polarity inversion control signal, thereby effectively avoiding the DC signal residual problem that may exist in the 2D De-Interlace mode, and because the front end signal quality is not Good residual DC signal residual problem, or DC caused by other reasons Signal residual problem, which eliminates image sticking caused by DC residual.

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Abstract

一种源极驱动装置、其极性反转控制方法及液晶显示装置。在源极驱动装置中，增加极性信号控制单元(200)，并且将极性信号控制单元(200)的输出端(A,B)分别与正负极性反转控制单元(100)中的第一通道选择电路(101)和第二通道选择电路(104)的控制端相连。采用对极性信号控制单元(200)的控制端输入的触发控制信号(Ctl)来控制极性信号控制单元(200)输出的极性反转控制信号(POL)的极性反转情况。

Description

一种源极驱动装置、其极性反转控制方法及液晶显示装置
相关申请
本申请要求享有2017年1月5日提交的中国专利申请No.201710008436.9的优先权，其全部公开内容通过引用并入本文。
技术领域
本公开涉及液晶显示技术领域，尤其涉及一种源极驱动装置、其极性反转控制方法及液晶显示装置。
背景技术
薄膜晶体管液晶显示器(TFT-LCD)利用液晶分子的光学各向异性和双折射特性来显示图像。具体地，TFT-LCD根据视频信号通过基板表面电极产生电场，该电场改变液晶分子的排列方向，从而控制液晶单元的透光率，进而实现图像显示。一般地，TFT-LCD通过交变电压极性法来驱动。在这样的驱动方法中，使得电压极性在相邻液晶单元之间和连续帧时段之间交变，以便降低液晶的劣化，使液晶能够长时间保持正常特性，从而保持长时间正常显示。如果数据电压的两个极性中的任一极性被主导性地提供了较长时间，会有直流信号(DC)残留。在一定时间后，残留的直流信号将会影响液晶特性，导致不正常的显示，并且产生信号残影。
目前市场上的电视(TV)信号基本上都采用交错(Interlace)及隔行扫描的模式，并且分辨率调整电路(TV Scaler)具有二维隔行交错(2D De-Interlace)模式和三维隔行交错(3D De-Interlace)模式。在2D De-Interlace模式下采用行缓冲(Line Buffer)功能，其中利用前后几行的信号对Interlace行进行信号计算，因而存储信号量较小。在3D De-Interlace模式下，通过对比帧信号来计算获得Interlace行的信号，因而需要较大存储量的存储单元以用于存储至少两个帧(Frame)的信号。由于在2D De-Interlace模式下只是简单地对当前帧中的几行数据进行数据处理，而无法获知当前行数据的真实值，因此所计算的结果不可避免地与下一帧的真实值有差异。因此，在使电压极性交变(即，极性反转)时存在DC差异值，若长时间播放静态画面，将会产生直流 信号长时间残留所导致的信号残影。然而，目前市场上中低端的电视，由于成本的考量，一般都会采用2D De-Interlace模式，这样不可避免地会出现信号残影的问题。
因此，在现有的液晶显示驱动方式中，液晶显示器的显示都需要正负电压进行驱动，但由于前端系统处理信号差异，会导致本应该绝对值相同的正负电压之间出现偏差，使得长时间的直流信号(DC)残留导致液晶极化，进而产生残影现象。
发明内容
有鉴于此，本公开实施例提供了一种源极驱动装置、其极性反转控制方法及液晶显示装置，其能够至少部分地缓解或甚至消除以上提到的问题中的一个或多个。
相应地，本公开实施例提供了一种源极驱动装置，包括正负极性反转控制单元，以及极性信号控制单元。所述正负极性反转控制单元包括：依次连接的第一通道选择电路、负电压通道和正电压通道，以及第二通道选择电路。所述第一通道选择电路分别与两个信号输入端相连，并且所述第二通道选择电路分别与两个信号输出端相连。所述极性信号控制单元包括：配置成接收极性反转控制信号的输入端、配置成接收触发控制信号的控制端，以及分别与所述第一通道选择电路和第二通道选择电路的控制端相连的输出端。所述极性信号控制单元配置成输出所接收到的所述极性反转控制信号，在接收到有效的触发控制信号之后，对要输出的极性反转控制信号进行极性反转，并且在再次接收到有效的触发控制信号之后再次对要输出的极性反转控制信号进行极性反转。
需要指出的是，遍及本公开所使用的术语“极性变换”、“极性反转”、“反向”及其派生物均是指，将正信号反转为相应的负信号，并且将负信号反转为相应的正信号，或者，将高信号反转为低信号，并且将低信号反转为高信号。
还需要指出的是，遍及本公开所使用的术语“有效的”触发控制信号是指使得极性信号控制单元反转极性反转控制信号的触发控制信号。取决于不同的使用情况，“有效的”触发控制信号可以是高电平信号或者低电平信号。
在一种可能的实现方式中，在本公开实施例提供的上述源极驱动装置中，所述极性信号控制单元与所述正负极性反转控制单元一一对应设置，且各所述极性信号控制单元的输入端与同一极性反转控制信号输入端相连。
在一种可能的实现方式中，本公开实施例提供的上述源极驱动装置还包括移位控制器。所述移位控制器包括配置成接收触发信号的输入端，以及与各所述极性信号控制单元的控制端一一对应连接的多个输出端。所述移位控制器配置成在接收到有效的触发信号时，按照顺序依次向各所述极性信号控制单元的控制端输出有效的触发控制信号。
在一种可能的实现方式中，本公开实施例提供的上述源极驱动装置还包括随机控制器。所述随机控制器包括配置成接收触发信号的输入端，以及与各所述极性信号控制单元的控制端一一对应连接的多个输出端。所述随机控制器配置成在接收到有效的触发信号时，按照随机顺序在同一时刻仅向一个所述极性信号控制单元的控制端输出有效的触发控制信号，且在每次接收到有效的触发信号后的一个周期内按照随机顺序依次向全部所述极性信号控制单元的控制端输出一次有效的触发控制信号。
在一种可能的实现方式中，在本公开实施例提供的上述源极驱动装置中，所述极性信号控制单元的控制端在每2n帧时间内接收一次有效的触发控制信号，n为正整数。
另一方面，本公开实施例还提供了一种液晶显示装置，包括本公开实施例提供的上述任一种源极驱动装置。
另一方面，本公开实施例还提供了一种源极驱动装置的极性反转控制方法。所述源极驱动装置包括正负极性反转控制单元，以及极性信号控制单元。所述正负极性反转控制单元包括：依次连接的第一通道选择电路、负电压通道和正电压通道，以及第二通道选择电路。所述第一通道选择电路分别与两个信号输入端相连，并且所述第二通道选择电路分别与两个信号输出端相连。所述极性信号控制单元包括：配置成接收极性反转控制信号的输入端，配置成接收触发控制信号的控制端，以及分别与所述第一通道选择电路和第二通道选择电路的控制端相连的输出端。
所述极性反转控制方法包括：通过所述极性信号控制单元将所接收到的极性反转控制信号输出至连接的所述第一通道选择电路和第二通道选择电路的控制端，在接收到有效的触发控制信号之后，对要输出的极性反转控制信号进行极性反转，并且在再次接收到有效的触发控制信号之后再次对要输出的极性反转控制信号进行极性反转。
在一种可能的实现方式中，在本公开实施例提供的上述极性反转控制方法中，所述极性信号控制单元与所述正负极性反转控制单元一一对应设置，且各所述极性信号控制单元的输入端与同一极性反转控制信号输入端相连。此时，所述极性反转控制方法还包括通过各所述极性信号控制单元接收同一极性反转控制信号输入端输出的所述极性反转控制信号。
在一种可能的实现方式中，在本公开实施例提供的上述极性反转控制方法中，所述源极驱动装置还包括移位控制器。所述移位控制器包括配置成接收触发信号的输入端，以及与各所述极性信号控制单元的输入端一一对应连接的多个输出端。此时，所述极性反转控制方法还包括通过所述移位控制器在接收到有效的触发信号时，按照顺序依次向各所述极性信号控制单元的输入端输出有效的触发控制信号。
在一种可能的实现方式中，在本公开实施例提供的上述极性反转控制方法中，所述源极驱动装置还包括随机控制器。所述随机控制器包括配置成接收触发信号的输入端，以及与各所述极性信号控制单元的输入端一一对应连接的多个输出端。此时，所述极性反转控制方法还包括通过所述随机控制器在接收到有效的触发信号时，按照随机顺序在同一时刻仅向一个所述极性信号控制单元的输入端输出有效的触发控制信号，且在每次接收到有效的触发信号后的一个周期内按照随机顺序依次向全部所述极性信号控制单元的输入端输出一次有效的所述触发控制信号。
在一种可能的实现方式中，本公开实施例提供的上述极性反转控制方法还包括通过所述极性信号控制单元在每2n帧时间内接收一次所述触发控制信号，n为正整数。
本公开实施例提供了一种源极驱动装置、其极性反转控制方法及液晶显示装置。在源极驱动装置中，增加极性信号控制单元，并且将极性信号控制单元的输出端分别与正负极性反转控制单元中的第一通 道选择电路和第二通道选择电路的控制端相连。这样，极性反转控制信号需要经过极性信号控制单元后才会输入至上述两个电路的控制端。采用对极性信号控制单元的控制端输入的触发控制信号来控制极性信号控制单元输出的极性反转控制信号的极性反转情况。具体地，在极性信号控制单元的控制端接收到有效的触发控制信号之后，极性信号控制单元会将原本要输出的极性反转控制信号进行极性反转后输出，并且在极性信号控制单元的控制端再次接收到有效的触发控制信号之后，极性信号控制单元会再次将原本要输出的极性反转控制信号进行极性反转后输出。正负极性反转控制单元根据接收到的极性反转控制信号来控制输出信号的极性，从而有效地避免2D De-Interlace模式下可能存在的直流信号残留问题，以及由于前端信号质量不佳造成的随机直流信号残留问题，或是其他原因引起的直流信号残留问题，进而消除由于DC残留引起的残影现象。
附图说明
图1为本公开实施例提供的源极驱动装置的结构示意图；
图2为典型的源极驱动装置的结构示意图；
图3为本公开实施例提供的源极驱动装置中极性信号控制单元的时序图；
图4为本公开实施例提供的源极驱动装置的部分结构示意图；以及
图5为本公开实施例提供的源极驱动装置的部分结构示意图。
具体实施方式
下面结合附图，对本公开实施例提供的源极驱动装置、其极性反转控制方法及液晶显示装置的具体实施方式进行详细地说明。
本公开实施例提供的一种源极驱动装置，如图1所示，包括：正负极性反转控制单元100，以及极性信号控制单元200。正负极性反转控制单元100包括：依次连接的第一通道选择电路101、正电压通道102和负电压通道103，以及第二通道选择电路104。第一通道选择电路101分别与两个信号输入端a和b相连，并且第二通道选择电路104分别与两个信号输出端A和B相连。
极性信号控制单元200包括：配置成接收极性反转控制信号POL的输入端、配置成接收触发控制信号Ctl的控制端，以及分别与第一通道选择电路101和第二通道选择电路104的控制端相连的输出端。极性信号控制单元200配置成输出所接收到的极性反转控制信号POL，假设要输出的极性反转控制信号为POLC，在接收到有效的触发控制信号Ctl之后，对要输出的极性反转控制信号POLC进行极性反转，并且在再次接收到有效的触发控制信号Ctl之后再次对要输出的极性反转控制信号POLC进行极性反转。
在本公开实施例提供的上述源极驱动装置中，增加了极性信号控制单元200，其输出端分别与正负极性反转控制单元100中的第一通道选择电路101和第二通道选择电路104的控制端相连。相较于其中极性反转控制信号POL直接输入至上述两个电路的控制端的典型方案(参见图2)，本公开实施例提供的源极驱动装置中的极性反转控制信号POL需要经过极性信号控制单元200后才会输入至上述两个电路的控制端。采用对极性信号控制单元200的控制端输入的触发控制信号Ctl来控制极性信号控制单元200输出的极性反转控制信号POLC的极性反转情况。具体地，在极性信号控制单元200的控制端接收到有效的触发控制信号Ctl之后，极性信号控制单元200会将原本要输出的极性反转控制信号POLC进行极性反转后输出，并且在极性信号控制单元200的控制端再次接收到有效的触发控制信号Ctl之后，极性信号控制单元200会再次将原本要输出的极性反转控制信号POLC进行极性反转后输出。正负极性反转控制单元100根据接收到的极性反转控制信号来控制输出信号的极性，从而有效地避免2D De-Interlace模式下可能存在的直流信号残留问题，以及由于前端信号质量不佳造成的随机直流信号残留问题，或是其他原因引起的直流信号残留问题，进而消除由于DC残留引起的残影现象。
在本公开实施例提供的上述源极驱动装置中，正负极性反转控制单元100可以采用常规的结构，因此，对于正负极性反转控制单元100中各电路的内部结构在此不做详述。
具体地，在本公开实施例提供的上述源极驱动装置中，如图3所示，极性信号控制单元200的输入端接收的极性反转控制信号POL为周期性变化的时钟信号。在极性信号控制单元200的控制端未接收到 有效(在图3的示例中，高电平)的触发控制信号Ctl之前，其输出端输出的极性反转控制信号POLC与输入的极性反转控制信号POL相同，POLC＝POL。在极性信号控制单元200的控制端接收到有效的触发控制信号Ctl(即Ctl为高电位)之后，从t1时刻开始，极性信号控制单元200对将要输出的极性反转控制信号POLC进行极性反转，即POLC＝反向POL，并且之后，尽管触发控制信号Ctl变为低电位，但是极性信号控制单元200仍旧对将要输出的极性反转控制信号POLC进行极性反转，直至下次极性信号控制单元200的控制端接收到有效的触发控制信号Ctl。在所述下次极性信号控制单元200的控制端接收到有效的触发控制信号Ctl之后，从t2时刻开始，极性信号控制单元200再次对将要输出的极性反转控制信号POLC进行极性反转，即POLC＝反向(反向POL)＝POL，也就是说，从t2时刻开始，极性信号控制单元200的输出端输出的极性反转控制信号POLC与输入的极性反转控制信号POL相同。此后，重复上述循环。
通过在每次极性信号控制单元200的控制端接收到有效的触发控制信号Ctl后都对要输出的极性反转控制信号POLC进行强制的极性反转变换，可以避免长时间的直流信号残留导致的信号残影现象。
在本公开实施例提供的上述源极驱动装置中，为了防止触发控制信号Ctl破坏原有的正负极性平衡，需要保证极性信号控制单元200的控制端在每2n帧时间内接收一次触发控制信号Ctl，从而进行极性反转变换，其中n为正整数，即触发控制信号Ctl的周期最小可以等于两帧时间，即可以每两帧输入一次触发控制信号Ctl。
在本公开实施例提供的上述源极驱动装置中，由于需要对液晶显示面板中的全部数据线进行驱动，因此，正负极性反转控制单元100一般会设置多对，每对正负极性反转控制单元100对相邻的两条数据线输出数据信号。在一种设置中，在源极驱动装置中可以仅设置一个极性信号控制单元200，其与所有的正负极性反转控制单元100中的第一通道选择电路101和第二通道选择电路104的控制端相连。这样，所有的正负极性反转控制单元100会同时接收到经极性变换的极性反转控制信号POLC，即在同一时刻接收到的极性反转控制信号POLC均相同。然而，在这样的方案中，当极性反转时容易引起显示面板整屏亮度突变，进而产生闪烁的问题。
基于此，在本公开实施例提供的上述源极驱动装置中，如图4和5所示，可以将极性信号控制单元200与正负极性反转控制单元100一一对应设置，即设置多个极性信号控制单元200，且每个极性信号控制单元200的输入端POL可以与同一极性反转控制信号输入端P相连，即接收到相同的极性反转控制信号POL。之后每个极性信号控制单元200的控制端可以在不同时刻接收到有效的触发控制信号Ctl，以使在显示面板中的极性变化发生在单个方向(例如，列方向)上，这样不易察觉到极性反转时的亮度差异。
在本公开实施例提供的上述源极驱动装置中，可以通过以下方式实现对不同的极性信号控制单元200分时输入触发控制信号Ctl。
在一种方式中，如图4所示，在源极驱动装置中增加移位控制器300。该移位控制器300包括配置成接收触发信号CTL的输入端，以及与各极性信号控制单元200的控制端一一对应连接的多个输出端。该移位控制器300配置成在接收到有效的触发信号CTL时，按照顺序依次向各极性信号控制单元200的控制端输出有效的触发控制信号Ctl。
通过如图4所示的方案可以实现顺序扫描，即通过移位控制器300对连接各极性信号控制单元200的控制端顺序输出有效的触发控制信号Ctl，使得在显示面板中的极性变化在单个方向(例如，列方向)上顺序地发生，以使在显示面板中的极性变化发生在单个方向(例如，列方向)上，这样不易察觉到极性反转时的亮度差异。
在另一种方式中，如图5所示，在源极驱动装置中增加随机控制器400。该随机控制器400包括配置成接收触发信号CTL的输入端，以及与各极性信号控制单元200的控制端一一对应连接的多个输出端。该随机控制器400配置成在接收到有效的触发信号CTL时，按照随机顺序在同一时刻仅向一个极性信号控制单元200的控制端输出有效的触发控制信号Ctl，且在每次接收到有效的触发信号CTL后的一个周期内按照随机顺序依次向全部极性信号控制单元200的控制端输出一次有效的触发控制信号Ctl。
通过如图5所示的方案可以实现随机扫描，即通过随机控制器400对连接各极性信号控制单元200的控制端随机输出有效的触发控制信号Ctl，使得在显示面板中的极性变化在单个方向(例如，列方向)上随机发生，以使在显示面板中的极性变化发生在单个方向(例如，列 方向)上，这样更不易察觉到极性反转时的亮度差异。
本公开实施例还提供了一种源极驱动装置的极性反转控制方法，由于该方法解决问题的原理与前述一种源极驱动装置相似，因此该装置的实施可以参见方法的实施，重复之处不再赘述。
具体地，在本公开实施例提供的一种源极驱动装置的极性反转控制方法中，如图1所示，源极驱动装置包括正负极性反转控制单元100，以及极性信号控制单元200。正负极性反转控制单元100包括：依次连接的第一通道选择电路101、正电压通道102和负电压通道103，以及第二通道选择电路104。第一通道选择电路101分别与两个信号输入端相连，并且第二通道选择电路104分别与两个信号输出端相连。极性信号控制单元200包括：配置成接收极性反转控制信号的输入端、配置成接收触发控制信号的控制端，以及分别与第一通道选择电路101和第二通道选择电路104的控制端相连的输出端。
对应地，本公开实施例提供的上述极性反转控制方法包括：
通过极性信号控制单元200将所接收到的极性反转控制信号输出至连接的第一通道选择电路101和第二通道选择电路104的控制端，在接收到有效的触发控制信号之后，对要输出的极性反转控制信号进行极性反转，并且在再次接收到有效的触发控制信号之后再次对要输出的极性反转控制信号进行极性反转。
在本公开实施例提供的上述极性反转控制方法中，极性信号控制单元200可以与正负极性反转控制单元100一一对应设置，且各极性信号控制单元200的输入端与同一极性反转控制信号输入端相连。
对应地，本公开实施例提供的上述极性反转控制方法还包括：通过各极性信号控制单元200接收同一极性反转控制信号输入端输出的极性反转控制信号。
在本公开实施例提供的上述极性反转控制方法中，源极驱动装置可以如图4所示，还包括移位控制器300。移位控制器300包括配置成接收触发信号的输入端，以及与各极性信号控制单元200的控制端一一对应连接的多个输出端。
对应地，本公开实施例提供的上述极性反转控制方法还包括通过移位控制器300在接收到有效的触发信号时，按照顺序依次向各极性信号控制单元200的控制端输出有效的触发控制信号。
在本公开实施例提供的上述极性反转控制方法中，源极驱动装置可以如图5所示，还包括随机控制器400。随机控制器400包括配置成接收触发信号的输入端，以及与各极性信号控制单元200的控制端一一对应连接的多个输出端。
对应地，本公开实施例提供的上述极性反转控制方法还包括通过随机控制器400在接收到有效的触发信号时，按照随机顺序在同一时刻仅向一个极性信号控制单元200的控制端输出有效的触发控制信号，且在每次接收到有效的触发信号后的一个周期内按照随机顺序依次向全部极性信号控制单元200的控制端输出一次有效的触发控制信号。
本公开实施例提供的上述极性反转控制方法还可以包括通过极性信号控制单元200在每2n帧时间内接收一次触发控制信号，n为正整数。
本公开实施例还提供了一种液晶显示装置，包括本公开实施例提供的上述源极驱动装置。该液晶显示装置可以为：手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。该显示装置的实施可以参见上述源极驱动装置的实施例，重复之处不再赘述。
在本公开实施例提供的上述源极驱动装置、其极性反转控制方法及液晶显示装置中，在源极驱动装置中增加了极性信号控制单元，并且将极性信号控制单元的输出端分别与正负极性反转控制单元中的第一通道选择电路和第二通道选择电路的控制端相连。这样，极性反转控制信号需要经过极性信号控制单元后才会输入至上述两个电路的控制端。采用对极性信号控制单元的控制端输入的触发控制信号来控制极性信号控制单元输出的极性反转控制信号的极性反转情况。具体地，在极性信号控制单元的控制端接收到有效的触发控制信号之后，极性信号控制单元会将原本要输出的极性反转控制信号进行极性反转后输出，并且在极性信号控制单元200的控制端再次接收到有效的触发控制信号Ctl之后，极性信号控制单元200会再次将原本要输出的极性反转控制信号POLC进行极性反转后输出。正负极性反转控制单元根据接收到的极性反转控制信号来控制输出信号的极性，从而有效地避免2D De-Interlace模式下可能存在的直流信号残留问题，以及由于前端信号质量不佳造成的随机直流信号残留问题，或是其他原因引起的直流 信号残留问题，进而消除由于DC残留引起的残影现象。
显然，本领域的技术人员可以对本公开进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。

Claims (11)

  1. 一种源极驱动装置，包括正负极性反转控制单元，以及极性信号控制单元，
    其中，
    所述正负极性反转控制单元包括：依次连接的第一通道选择电路、负电压通道和正电压通道，以及第二通道选择电路，其中，所述第一通道选择电路分别与两个信号输入端相连，并且所述第二通道选择电路分别与两个信号输出端相连，
    所述极性信号控制单元包括：配置成接收极性反转控制信号的输入端，配置成接收触发控制信号的控制端，以及分别与所述第一通道选择电路和第二通道选择电路的控制端相连的输出端，所述极性信号控制单元配置成输出所接收到的所述极性反转控制信号，在接收到有效的触发控制信号之后，对要输出的极性反转控制信号进行极性反转，并且在再次接收到有效的触发控制信号之后再次对要输出的极性反转控制信号进行极性反转。
  2. 如权利要求1所述的源极驱动装置，其中，所述极性信号控制单元与所述正负极性反转控制单元一一对应设置，且各所述极性信号控制单元的输入端与同一极性反转控制信号输入端相连。
  3. 如权利要求2所述的源极驱动装置，还包括移位控制器，所述移位控制器包括配置成接收触发信号的输入端，以及与各所述极性信号控制单元的控制端一一对应连接的多个输出端，
    其中，所述移位控制器配置成在接收到有效的触发信号时，按照顺序依次向各所述极性信号控制单元的控制端输出有效的触发控制信号。
  4. 如权利要求2所述的源极驱动装置，还包括随机控制器，所述随机控制器包括配置成接收触发信号的输入端，以及与各所述极性信号控制单元的控制端一一对应连接的多个输出端，
    其中，所述随机控制器配置成在接收到有效的触发信号时，按照随机顺序在同一时刻仅向一个所述极性信号控制单元的控制端输出有效的触发控制信号，且在每次接收到有效的触发信号后的一个周期内按照随机顺序依次向全部所述极性信号控制单元的控制端输出一次有 效的触发控制信号。
  5. 如权利要求1-4任一项所述的源极驱动装置，其中，所述极性信号控制单元的控制端在每2n帧时间内接收一次有效的触发控制信号，n为正整数。
  6. 一种液晶显示装置，包括如权利要求1-5任一项所述的源极驱动装置。
  7. 一种源极驱动装置的极性反转控制方法，其中，所述源极驱动装置包括正负极性反转控制单元，以及极性信号控制单元，
    其中，
    所述正负极性反转控制单元包括：依次连接的第一通道选择电路、负电压通道和正电压通道，以及第二通道选择电路，所述第一通道选择电路分别与两个信号输入端相连，并且所述第二通道选择电路分别与两个信号输出端相连，
    所述极性信号控制单元包括：配置成接收极性反转控制信号的输入端，配置成接收触发控制信号的控制端，以及分别与所述第一通道选择电路和第二通道选择电路的控制端相连的输出端，
    所述极性反转控制方法包括：
    通过所述极性信号控制单元将所接收到的极性反转控制信号输出至连接的所述第一通道选择电路和第二通道选择电路的控制端，在接收到有效的触发控制信号之后，对要输出的极性反转控制信号进行极性反转，并且在再次接收到有效的触发控制信号之后再次对要输出的极性反转控制信号进行极性反转。
  8. 如权利要求7所述的极性反转控制方法，其中，所述极性信号控制单元与所述正负极性反转控制单元一一对应设置，且各所述极性信号控制单元的输入端与同一极性反转控制信号输入端相连，并且
    所述极性反转控制方法还包括通过各所述极性信号控制单元接收同一极性反转控制信号输入端输出的所述极性反转控制信号。
  9. 如权利要求8所述的极性反转控制方法，其中，所述源极驱动装置还包括移位控制器，所述移位控制器包括配置成接收触发信号的输入端，以及与各所述极性信号控制单元的控制端一一对应连接的多个输出端，并且
    所述极性反转控制方法还包括通过所述移位控制器在接收到有效 的触发信号时，按照顺序依次向各所述极性信号控制单元的控制端输出有效的触发控制信号。
  10. 如权利要求8所述的极性反转控制方法，其中，所述源极驱动装置还包括随机控制器，所述随机控制器包括配置成接收触发信号的输入端，以及与各所述极性信号控制单元的控制端一一对应连接的多个输出端，并且
    所述极性反转控制方法还包括通过所述随机控制器在接收到有效的触发信号时，按照随机顺序在同一时刻仅向一个所述极性信号控制单元的控制端输出有效的触发控制信号，且在每次接收到有效的触发信号后的一个周期内按照随机顺序依次向全部所述极性信号控制单元的控制端输出一次有效的触发控制信号。
  11. 如权利要求7-10任一项所述的极性反转控制方法，还包括通过所述极性信号控制单元在每2n帧时间内接收一次所述触发控制信号，n为正整数。
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