WO2014134867A1 - 极性反转驱动方法、驱动装置和液晶显示设备 - Google Patents

极性反转驱动方法、驱动装置和液晶显示设备 Download PDF

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Publication number
WO2014134867A1
WO2014134867A1 PCT/CN2013/075314 CN2013075314W WO2014134867A1 WO 2014134867 A1 WO2014134867 A1 WO 2014134867A1 CN 2013075314 W CN2013075314 W CN 2013075314W WO 2014134867 A1 WO2014134867 A1 WO 2014134867A1
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Prior art keywords
frame
control level
polarity
signal
width
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PCT/CN2013/075314
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English (en)
French (fr)
Inventor
吴行吉
许益祯
张亮
Original Assignee
京东方科技集团股份有限公司
北京京东方显示技术有限公司
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Application filed by 京东方科技集团股份有限公司, 北京京东方显示技术有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US14/367,825 priority Critical patent/US9437147B2/en
Priority to EP13861515.8A priority patent/EP2966640A4/en
Publication of WO2014134867A1 publication Critical patent/WO2014134867A1/zh

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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
    • G09G3/3614—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
    • 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
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/08—Details of image data interface between the display device controller and the data line driver circuit

Definitions

  • the present invention relates to the field of liquid crystal display technologies, and in particular, to a polarity inversion driving method, a driving device, and a liquid crystal display device.
  • Afterimages usually include surface afterimages and line afterimages.
  • line afterimages is due to the difference in pixel voltage between two frames before and after a certain line in some pictures, resulting in a DC component that acts for a long time.
  • Produced by liquid crystal molecules For example, a certain picture is a black and white interface picture, the 99th, 100th acts white, the 101st acts black, and when the broadcast television transmits an interlaced signal, only odd or even line signals are transmitted, such as the Nth frame, the 99th is transmitted.
  • the 101st acts black signal, that is, only the odd line is transmitted, the display end automatically calculates the data of the 100th line, and generates a gray picture between black and white.
  • the broadcast television transmits the even line signal.
  • the real signal of the 100th line will be transmitted, that is, the white picture. It can be seen that the pixel voltage of the 100th line in the Nth frame and the N+1th frame is different, thereby generating a DC component and a long-term DC component. Acting on liquid crystal molecules to cause line afterimages.
  • the method for solving the line afterimage problem is the polarity inversion signal (Polarity Inversion), which is a signal for controlling the polarity of the pixel.
  • Polarity Inversion a signal for controlling the polarity of the pixel.
  • the polarity inversion signal Polarity Inversion
  • FIG. 1 one line of pixels is scanned every half cycle, and each The row pixels have a certain two polarity arrangement, one of the polarity arrangements is selected when the POL is high, and the other polarity is selected when the POL is low, for example, for a single pixel.
  • the polarity is +-+-+-
  • POL is reversed in the fourth frame
  • the polarity of the pixel in the same multi-frame after POL inversion is +-++-+
  • the original polarity change mode is reversed.
  • the DC component By alternating POL inversion, the DC component can be reversed accordingly, so that the DC components in a period of time cancel each other out, and the line residual image can be eliminated.
  • the pixels are charged twice with the same polarity within one frame of the POL inversion, an overshoot is formed, so that the human eye can perceive the brightness increase of the frame under the static picture, that is, the flicker is generated.
  • Embodiments of the present invention provide a polarity inversion driving method, a driving device, and a liquid crystal display device that attenuate flicker caused by POL inversion.
  • the embodiment of the present invention adopts the following technical solutions:
  • a polarity inversion driving method for inverting pixel polarity on a liquid crystal panel, including:
  • control signal including a control level generated in the m frame, where m is an integer greater than or equal to 2;
  • the width of the control level in each frame of the m frame is gradually increased in chronological order until the width of the control level is equal to the duration of one frame;
  • the width of the control level in each frame of the m frame is gradually reduced to zero by a duration equal to one frame in chronological order;
  • a polarity inversion signal is generated based on the polarity inversion reference signal and the control signal.
  • control signal is composed of the control level and the non-control level, the control level is a high level, and the non-control level is a low level;
  • the polarity inversion reference signal is XORed with the control signal to obtain the polarity inversion signal.
  • the method further includes:
  • the width of the control level in each frame of n frames is gradually reduced from zero to a time in a time sequence equal to one frame, where n is an integer greater than or equal to two.
  • the method further includes:
  • the width of the control level in each frame of n frames is gradually increased from zero to the duration of one frame in chronological order, where n is an integer greater than or equal to 2.
  • a polarity inversion driving device for inverting pixel polarity on a liquid crystal panel, including:
  • a reference signal generating unit configured to generate a polarity inversion reference signal, the polarity inversion reference signal No. is used to reflect the selection of the polarity of each row of pixels on the liquid crystal panel;
  • a control signal generating unit configured to generate a control signal, where the control signal includes a control level generated in the m frame, where m is an integer greater than or equal to 2;
  • the width of the control level in each frame of the m frame is gradually increased in chronological order until the width of the control level is equal to the duration of one frame;
  • the width of the control level in each frame of the m frame is gradually reduced to zero by a duration equal to one frame in chronological order;
  • an inversion signal generating unit configured to generate a polarity inversion signal according to the polarity inversion reference signal and the control signal.
  • control signal is composed of the control level and the non-control level, the control level is a high level, and the non-control level is a low level;
  • the inversion signal generating unit is specifically configured to perform an exclusive OR operation on the polarity inversion reference signal and the control signal to obtain the polarity inversion signal.
  • control signal generating unit is further configured to gradually increase the width of the control level in each frame of the m frame in time sequence until the width of the control level is equal to a duration of one frame. Thereafter, the width of the control level in each frame of n frames is gradually reduced to zero by a duration equal to one frame in chronological order, where n is an integer greater than or equal to 2.
  • control signal generating unit is further configured to: after the width of the control level in each frame of the m frame is gradually reduced to zero by a duration equal to one frame, The width of the control level in each frame of the n frame is gradually increased from zero to the duration of one frame in chronological order, where n is an integer greater than or equal to 2.
  • a liquid crystal display device comprising the above-described polarity inversion driving device.
  • the polarity inversion driving method, the driving device and the liquid crystal display device provided by the embodiments of the present invention realize the gradual completion of the POL inversion in a plurality of frame times, compared with the POL inversion in one frame time in the prior art.
  • the change of the picture when the POL is reversed is smoother, and the human eye does not easily feel the flicker.
  • FIG. 2 is a flowchart of a polarity inversion driving method according to an embodiment of the present invention
  • FIG. 3 is a timing diagram of a polarity inversion reference signal, a control signal, and a polarity inversion signal according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a change of a control signal in a first mode of step 102 in the embodiment of the present invention
  • FIG. 5 is a schematic diagram of a change of a control signal in a second mode of step 102 in the embodiment of the present invention
  • a flow chart of another polarity inversion driving method in the example
  • FIG. 7 is a structural block diagram of a polarity inversion driving apparatus according to an embodiment of the present invention.
  • an embodiment of the present invention provides a polarity inversion driving method for inverting pixel polarity on a liquid crystal panel, including:
  • Step 101 as shown in FIG. 3, generating a polarity inversion reference signal POL, POL for reflecting the selection of the polarity of each row of pixels on the liquid crystal panel, POL, which is equivalent to a POL that is not inverted, for example, POL, which can be a periodic square wave signal, one cycle of POL for each scan of the liquid crystal panel, POL, the opposite signal in each adjacent two frames, that is, the pixel polarity of each row of the liquid crystal panel is inverted once.
  • the polarity inversion reference signal POL can be set according to the actual pixel polarity required on the liquid crystal panel, and is not necessarily a square wave signal of one cycle per scan, for example, four scans per scan. Acting on a periodic square wave signal and other forms of signals;
  • Step 102 Generate a control signal CTRL, where the control signal CTRL includes a control level generated in the m frame, where m is an integer greater than or equal to 2;
  • the step may specifically be the first mode.
  • the high level is the control level
  • the low level is the non-control level
  • the control level is gradually increased in time series in each frame of the m frame.
  • the width to the control level is equal to the duration of one frame;
  • the step may specifically be the second mode.
  • the high level is the control level
  • the low level is the non-control level
  • the control level is equal to the width in each frame of the m frame in chronological order. The duration of one frame gradually decreases to zero;
  • Step 103 as shown in FIG. 3, generates a polarity inversion signal POL according to the polarity inversion reference signal POL and the control signal CTRL.
  • the polarity inversion signal POL at the control level position is an inverted signal of the polarity inversion reference signal POL
  • the polarity inversion signal POL at the non-control level position is the polarity inversion reference signal POL
  • the entire polarity inversion signal POL controls the polarity of the pixel
  • the high and low levels of the polarity inversion signal POL respectively control different pixel polarity selections.
  • the polarity inversion signal POL in this embodiment is the same as the signal of the existing control pixel polarity.
  • the polarity inversion signal POL The only difference from the existing control pixel polarity is that it extends the time of POL inversion.
  • the control level is first.
  • the width of the control level is increased every r frame, r is an integer greater than or equal to 1, and the duration of the scan s line is increased each time, s
  • the width of the control level is equal to the duration of one frame up to the p+qth frame.
  • the first four lines of the p+1 frame generate the control level, that is, the first four lines of POL and POL.
  • control level of the p+2 frame is the same as the p+1th frame, p+
  • the first 8 lines of the 3 frames scan time generates the control level, that is, the POL and POL of the first 8 lines.
  • control level of the p+4 frame is the same as the p+3 frame, and the first 12 lines of the p+5 frame.
  • the scan time generates the control level, that is, the POL and POL of the first 12 lines.
  • control level of the p+6 frame is the same as the p+5 frame, and so on. In the p+q frame, all line scans are performed.
  • the time is generated to control the level, that is, the POL of each frame duration is opposite to POL, where p is a positive integer and q is an integer greater than 1. It can be seen that, in the p-th frame, POL is the same as POL. In the frames from p+1th to p+q-1, POL and POL, the opposite and opposite parts are gradually increased, at the p+ At the time of q frame, the polarity inversion reference signal POL is completely opposite to the polarity inversion signal POL, that is, the polarity inversion signal POL gradually completes the entire POL inversion within a few frames.
  • control level in different frames may be inconsistent, and it is only necessary to satisfy the width of the control level in each frame gradually increasing in chronological order until the width of the control level is equal to the length of one frame.
  • the POL inversion may be performed by gradually decreasing the control level by the second mode in step 102, for example.
  • the width of the control level in the p-th frame is equal to the duration of one frame, and the polarity inversion reference signal POL is completely opposite to the polarity inversion signal POL.
  • the control level The width is less than the duration of one frame, the part POL is the same as POL, and the width of the control level is the same in the p+2 frame.
  • the degree is further reduced relative to the width of the previous frame control level, POL and POL, the same portion is increased, and so on, until the p+q frame, no control level, polarity inversion reference signal POL, and pole
  • the sex inversion signal POL is identical, that is, the entire POL inversion is gradually completed within a few frames.
  • the first mode and the second mode in the above step 102 are alternately performed, and the control power is not generated before the POL inversion is performed.
  • the first POL inversion is completed by the first method described above, and then the second POL inversion is implemented by the second method described above, and so on, to achieve alternating POL inversion; if no POL inversion is performed Previously, the generated control level occupies the duration of one frame, then the first POL inversion is completed by the second method described above, and then the second POL inversion is completed by the first method described above, and so on, to achieve alternating POL reversed.
  • the width of the control level and the time interval of the control level width change during POL inversion are not limited.
  • the control level when it is first generated, it may be the POL inversion of the last 5 lines of the p-th frame, and then the p-th The POL is reversed in the last 12 lines of the +1 frame, the POL is reversed in the first 15 lines of the p+2 frame, and so on.
  • the width of the specific control level and the time interval of the control level width change can be adjusted as needed. The faster the completion of the entire POL inversion, the better the effect of eliminating the line residual image, and the slower the complete POL inversion, the smaller the flicker effect. .
  • steps 101, 102, and 103 are processes for generating three kinds of signals, there may be no temporal relationship between them, just to describe different processes, and they may be simultaneously in time.
  • the process of generating the polarity inversion signal POL in step 103 needs to be performed according to the polarity inversion reference signal POL that has been generated, and the control signal CTRL.
  • the POL inversion is more smooth than the POL inversion in one frame time in the prior art, and the change in the picture is smoother when the POL is reversed, and the blinking is not easily perceived by the human eye.
  • control signal CTRL is composed of the above-mentioned control level and non-control level, wherein the control level is a high level, and the non-control level is a low level; the above step 103, according to the polarity inversion reference signal POL, and the control
  • the signal CTRL generates a polarity inversion signal POL as follows:
  • the polarity inversion reference signal POL is XORed with the control signal CTRL to obtain a polarity inversion signal POL.
  • an embodiment of the present invention provides a polarity inversion driving method for inverting pixel polarity on a liquid crystal panel, including:
  • Step 101 as shown in FIG. 3, generating a polarity inversion reference signal POL, POL for reflecting the selection of the polarity of each row of pixels on the liquid crystal panel;
  • Step 102 Generate a control signal CTRL, and the control signal CTRL includes the generated in the m frame.
  • Control level where m is an integer greater than or equal to 2;
  • Step 1021 as shown in FIG. 4, the width of the control level in each frame of the m frame is gradually increased in chronological order until the width of the control level is equal to the duration of one frame;
  • the step is specifically the first mode of step 102 in the foregoing embodiment, and no further, in step 1021, the width of the control level in each frame of the m frame is gradually increased to the control power in time sequence.
  • the flat width is equal to the duration of one frame, it also includes:
  • Step 1022 As shown in FIG. 5, the width of the control level in each frame of the n frame is gradually reduced to zero by a duration equal to one frame in time sequence, where n is an integer greater than or equal to 2.
  • step is specifically the second mode of step 102 in the foregoing embodiment, and details are not described herein again.
  • Step 1031 The polarity inversion reference signal POL is XORed with the control signal CTRL to obtain the polarity inversion signal POL.
  • step 1021 there is no control level.
  • the control level occupies a frame length, that is, the polarity inversion signal POL is completely inverted.
  • step 1022 there is no control level. , that is, the inverted polarity inversion signal POL is restored to before the inversion.
  • Steps 1021 and 1022 are alternately performed in step 102, i.e., by periodically cycling the processes in which the widths of the control levels are gradually increased and decreased in the different control levels, that is, the periodic inversion of the polarity inversion signal POL is realized.
  • the POL inversion is more smooth than the POL inversion in one frame time in the prior art, and the change in the picture is smoother when the POL is reversed, and the blinking is not easily perceived by the human eye.
  • an embodiment of the present invention further provides a polarity inversion driving device for inverting pixel polarity on a liquid crystal panel, including:
  • the reference signal generating unit 1 is configured to generate a polarity inversion reference signal, where the polarity inversion reference signal is used to reflect a selection of pixel polarity of each row on the liquid crystal panel;
  • control signal generating unit 2 configured to generate a control signal, where the control signal includes a control level generated in an m frame, where m is an integer greater than or equal to 2;
  • the width of the control level in each frame of the m frame is gradually increased in chronological order until the width of the control level is equal to the duration of one frame;
  • the width of the control level in each frame of the m frame is equal to one frame in chronological order
  • the length of time gradually decreases to zero;
  • the inversion signal generating unit 3 is configured to generate a polarity inversion signal based on the polarity inversion reference signal and the control signal.
  • the POL inversion is more smooth than the POL inversion in one frame time in the prior art, and the change in the picture is smoother when the POL is reversed, and the blinking is not easily perceived by the human eye.
  • control signal is composed of the control level and the non-control level, the control level is a high level, and the non-control level is a low level;
  • the inversion signal generating unit 3 is specifically configured to perform an exclusive OR operation on the polarity inversion reference signal and the control signal to obtain the polarity inversion signal.
  • control signal generating unit 2 is further configured to gradually increase the width of the control level in each frame of the m frame in time sequence until the width of the control level is equal to a duration of one frame. And making the width of the control level in each frame of n frames gradually decrease from chronologically to a time equal to one frame, wherein n is an integer greater than or equal to 2.
  • the polarity inversion driving device in the embodiment of the invention realizes the gradual completion of the POL inversion in a plurality of frame times, and compares the POL inversion in one frame time in the prior art.
  • the changes are smoother and the human eye does not easily feel the flicker.
  • the embodiment of the invention further provides a liquid crystal display device comprising the above polarity inversion driving device.
  • the specific polarity inversion driving device structure and the polarity inversion method and the principle are the same as those in the above embodiment, and are not described herein again.
  • the POL inversion is gradually completed in a plurality of frame times, and the change of the picture is smoother when the POL is reversed compared with the POL inversion in one frame time in the prior art. It is not easy for the human eye to feel the flicker.
  • the embodiments of the present invention can be implemented by means of software plus necessary general hardware, and of course, by hardware, but in many cases, the former is better.
  • Implementation Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a readable storage medium, such as a computer. Floppy disk, hard disk or CD, etc., including a number of instructions to make a computer device (can be a personal device)
  • a computer, server, or network device, etc. performs the methods described in various embodiments of the present invention.

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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)
  • Liquid Crystal Display Device Control (AREA)
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Abstract

一种极性反转驱动方法、驱动装置和液晶显示设备，减弱了POL反转造成的闪烁。极性反转驱动方法，用于液晶面板上像素极性的反转，包括：生成极性反转参考信号，极性反转参考信号用于反映液晶面板上每行像素极性的选择；生成控制信号，控制信号包括在m帧中生成的控制电平，其中m为大于或等于2的整数；控制电平在m帧每帧中的宽度按照时间顺序逐渐增大至控制电平的宽度等于一帧的时长；或者，控制电平在m帧每帧中的宽度按照时间顺序由等于一帧的时长逐渐减小至零；根据极性反转参考信号和控制信号，生成极性反转信号。

Description

极性反转驱动方法、 驱动装置和液晶显示设备 技术领域
本发明涉及液晶显示技术领域， 尤其涉及一种极性反转驱动方法、 驱动 装置和液晶显示设备。
背景技术
随着显示技术的发展， 液晶显示器（Liquid Crystal Display, LCD ) 因其 轻便、低辐射等优点越来越受到人们的欢迎。 目前困扰 LCD的一大主要问题 是残像问题， 残像通常包括面残像和线残像， 其中， 线残像问题是由于某些 画面下某行前后两帧像素电压不同， 导致产生直流分量， 长时间作用于液晶 分子产生的。 例如， 某一画面为黑白交界画面， 第 99、 100行为白， 第 101 行为黑， 广播电视传送隔行扫描信号时， 即只传送奇数行或偶数行信号， 如 第 N帧时， 传送了第 99行为白， 第 101行为黑的信号， 即只传送奇数行， 显示端自动计算第 100行的数据， 介于黑白之间产生一个灰画面， 在第 N+1 帧时， 广播电视传送偶数行信号， 这时， 会把第 100行的真实信号传送过来， 即白画面， 可以看出第 100行在第 N帧和第 N+1帧的像素电压不同， 因此产 生直流分量， 长时间的直流分量作用在液晶分子上造成线残像。
目前解决线残像问题的方法是极性反转信号 （Polarity Inversion, 筒称 POL )反转， POL是控制像素极性的信号， 例如， 如图 1所示， 每半个周期 扫描一行像素， 每行像素都具有确定的两种极性排布， POL高电平时选择其 中一种极性排布， POL低电平时选择其中另外一种极性排布， 例如对于一个 单独的像素来说， 在多帧中其极性依次为 +-+-+-, 如果在第四帧时进行 POL 反转， POL反转后该像素在相同的多帧中的极性依次为 +-++-+, 即将原有的 极性变化方式做一次反向，通过交替的 POL反转，可以使直流分量相应反转， 从而使一段时间内的直流分量相互抵消，实现消除线残像。然而，由于在 POL 反转的一帧时间内像素以相同的极性充电两次， 形成过沖， 使得静态画面下 人眼能够感受到这一帧的亮度增加， 即产生闪烁。
发明内容 本发明的实施例提供一种极性反转驱动方法、驱动装置和液晶显示设备, 减弱了 POL反转造成的闪烁。
为解决上述技术问题， 本发明的实施例采用如下技术方案：
一方面， 提供一种极性反转驱动方法， 用于液晶面板上像素极性的反转， 包括：
生成极性反转参考信号， 所述极性反转参考信号用于反映所述液晶面板 上每行像素极性的选择；
生成控制信号， 所述控制信号包括在 m帧中生成的控制电平， 其中 m为 大于或等于 2的整数；
所述控制电平在所述 m帧每帧中的宽度按照时间顺序逐渐增大至所述控 制电平的宽度等于一帧的时长；
或者， 所述控制电平在所述 m帧每帧中的宽度按照时间顺序由等于一帧 的时长逐渐减小至零；
根据所述极性反转参考信号和控制信号， 生成极性反转信号。
根据一实施例， 所述控制信号由所述控制电平和非控制电平组成， 所述 控制电平为高电平， 所述非控制电平为低电平；
所述根据所述极性反转参考信号和控制信号， 生成极性反转信号的过程 为：
所述极性反转参考信号与所述控制信号进行异或运算， 得到所述极性反 转信号。
根据一实施例， 在所述控制电平在所述 m帧每帧中的宽度按照时间顺序 逐渐增大至所述控制电平的宽度等于一帧的时长之后， 还包括：
所述控制电平在 n帧每帧中的宽度按照时间顺序由等于一帧的时长逐渐 减小至零， 其中 n为大于或等于 2的整数。
根据一实施例， 在所述控制电平在所述 m帧每帧中的宽度按照时间顺序 由等于一帧的时长逐渐减小至零之后， 还包括：
所述控制电平在 n帧每帧中的宽度按照时间顺序由零逐渐增加至一帧的 时长， 其中 n为大于或等于 2的整数。
另一方面， 还提供一种极性反转驱动装置， 用于液晶面板上像素极性的 反转， 包括：
参考信号生成单元， 用于生成极性反转参考信号， 所述极性反转参考信 号用于反映所述液晶面板上每行像素极性的选择；
控制信号生成单元， 用于生成控制信号， 所述控制信号包括在 m帧中生 成的控制电平， 其中 m为大于或等于 2的整数；
所述控制电平在所述 m帧每帧中的宽度按照时间顺序逐渐增大至所述控 制电平的宽度等于一帧的时长；
或者， 所述控制电平在所述 m帧每帧中的宽度按照时间顺序由等于一帧 的时长逐渐减小至零；
反转信号生成单元， 用于根据所述极性反转参考信号和控制信号， 生成 极性反转信号。
根据一实施例， 所述控制信号由所述控制电平和非控制电平组成， 所述 控制电平为高电平， 所述非控制电平为低电平；
所述反转信号生成单元， 具体用于将所述极性反转参考信号与所述控制 信号进行异或运算， 得到所述极性反转信号。
根据一实施例， 所述控制信号生成单元， 还用于在所述控制电平在所述 m帧每帧中的宽度按照时间顺序逐渐增大至所述控制电平的宽度等于一帧的 时长之后， 使所述控制电平在 n帧每帧中的宽度按照时间顺序由等于一帧的 时长逐渐减小至零， 其中 n为大于或等于 2的整数。
根据一实施例， 所述控制信号生成单元， 还用于在所述控制电平在所述 m帧每帧中的宽度按照时间顺序由等于一帧的时长逐渐减小至零之后， 使所 述控制电平在 n帧每帧中的宽度按照时间顺序由零逐渐增加至一帧的时长， 其中 n为大于或等于 2的整数。
另一方面， 还提供一种液晶显示设备， 包括上述的极性反转驱动装置。 本发明实施例提供的极性反转驱动方法、 驱动装置和液晶显示设备， 实 现了在数帧时间内逐渐完成 POL反转，与现有技术中在一帧时间内完成 POL 反转相比， 使得 POL反转时画面的变化更加平滑， 人眼不容易感受到闪烁。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作筒单地介绍， 显而易见地， 下面 描述中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以根据这些附图获得其他的附图。 图 1为现有技术中 POL的时序图；
图 2为本发明实施例中一种极性反转驱动方法的流程图；
图 3为本发明实施例中一种极性反转参考信号、 控制信号和极性反转信 号的时序图；
图 4为本发明实施例中步骤 102的第一种方式下控制信号的变化示意图; 图 5为本发明实施例中步骤 102的第二种方式下控制信号的变化示意图; 图 6为本发明实施例中另一种极性反转驱动方法的流程图；
图 7为本发明实施例中一种极性反转驱动装置的结构框图。
具体实施方式
下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进行 清楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而 不是全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有作 出创造性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范围。
如图 2所示， 本发明实施例提供了一种极性反转驱动方法， 用于液晶面 板上像素极性的反转， 包括：
步骤 101、 如图 3所示， 生成极性反转参考信号 POL，， POL，用于反映所 述液晶面板上每行像素极性的选择， POL，相当于不进行反转的 POL, 例如， POL，可以为周期性的方波信号， 液晶面板每扫描两行为 POL，的一个周期， POL，在每相邻的两帧中为相反的信号， 即液晶面板每扫描一行像素极性反转 一次， 需要说明的是， 极性反转参考信号 POL，可以根据实际的液晶面板上需 要的像素极性进行设置， 不一定为每扫描两行为一个周期的方波信号， 例如 还可以为每扫描四行为一个周期的方波信号等其他形式的信号；
步骤 102、 生成控制信号 CTRL, 控制信号 CTRL包括在 m帧中生成的 控制电平， 其中 m为大于或等于 2的整数；
该步骤具体可以为第一种方式， 如图 4所示， 高电平为控制电平， 低电 平为非控制电平， 控制电平在 m帧每帧中的宽度按照时间顺序逐渐增大至控 制电平的宽度等于一帧的时长；
或者该步骤具体可以为第二种方式， 如图 5所示， 高电平为控制电平， 低电平为非控制电平， 控制电平在 m帧每帧中的宽度按照时间顺序由等于一 帧的时长逐渐减小至零； 步骤 103、 如图 3所示， 根据极性反转参考信号 POL，和控制信号 CTRL, 生成极性反转信号 POL。 具体地， 在控制电平位置的极性反转信号 POL为极 性反转参考信号 POL，的反转信号， 在非控制电平位置的极性反转信号 POL 为极性反转参考信号 POL，， 整个极性反转信号 POL控制像素的极性， 极性 反转信号 POL的高低电平分别控制不同的像素极性选择。在一帧时长都为非 控制电平或者控制电平的时间内， 本实施例中极性反转信号 POL与现有的控 制像素极性的信号相同， 本实施例中极性反转信号 POL与现有的控制像素极 性的区别只在于延长了 POL反转的时间。
具体地， 例如步骤 102中的第一种方式， 如图 4所示， 第 p帧时无控制 电平， 极性反转参考信号 POL，与极性反转信号 POL相同， 控制电平第一次 生成在第 p+1帧中， 为了便于控制电平的生成， 控制电平的宽度每 r帧增大 一次， r为大于或等于 1的整数， 每次增大扫描 s行的时长， s为大于或等于 1的整数， 直到第 p+q帧时， 控制电平的宽度等于一帧的时长。 具体地， 第 p+1帧的前 4行扫描时间生成控制电平， 即前 4行的 POL与 POL，相反， 第 p+2帧的控制电平与第 p+1帧相同， 第 p+3帧的前 8行扫描时间生成控制电 平， 即前 8行的 POL与 POL，相反， 第 p+4帧的控制电平与第 p+3帧相同， 第 p+5帧的前 12行扫描时间生成控制电平， 即前 12行的 POL与 POL，相反， 第 p+6帧的控制电平与第 p+5帧相同， 以此类推， 在第 p+q帧中， 所有行扫 描时间都生成控制电平， 即每一帧时长的 POL都与 POL，相反， 其中 p为正 整数， q为大于 1的整数。 可以看出， 第 p帧时， POL，与 POL相同， 在第 p+1帧至第 p+q-1帧这些帧中， POL与 POL，部分相反且相反的部分逐渐增加， 在第 p+q帧时， 极性反转参考信号 POL，与极性反转信号 POL完全相反， 也 就是极性反转信号 POL在数帧内逐渐完成了整个 POL反转。
能够理解的， 控制电平在不同帧中的位置和变化幅度可以不一致， 只需 要满足每帧中控制电平的宽度按照时间顺序逐渐增大至控制电平的宽度等于 一帧的时长即可。
除了通过步骤 102中的第一种方式使控制电平逐渐增大以进行 POL反转 夕卜，还可以通过步骤 102中的第二种方式使控制电平逐渐减小来进行 POL反 转， 例如， 如图 5所示， 第 p帧时控制电平的宽度等于一帧的时长， 极性反 转参考信号 POL，与极性反转信号 POL完全相反， 在第 p+1帧， 控制电平的 宽度小于一帧的时长， 部分 POL与 POL，相同， 在第 p+2帧， 控制电平的宽 度相对于上一帧控制电平的宽度进一步减小， POL与 POL，相同的部分增多， 以此类推， 直到第 p+q帧， 没有控制电平， 极性反转参考信号 POL，与极性反 转信号 POL完全相同， 即在数帧内逐渐完成了整个 POL反转。
需要说明的是， 在实现交替的 POL反转以消除线残像的过程中， 上述步 骤 102中的第一种方式和第二种方式交替进行， 在未进行 POL反转之前， 若 未产生控制电平， 则第一次 POL反转通过上述第一种方式完成， 之后通过上 述第二种方式实现第二次 POL反转， 以此类推， 实现交替的 POL反转； 若 在未进行 POL反转之前， 产生的控制电平占据一帧的时长， 则第一次 POL 反转通过上述第二种方式完成，之后通过上述第一种方式完成第二次 POL反 转， 以此类推， 实现交替的 POL反转。 POL反转时控制电平的宽度和控制电 平宽度变化的时间间隔不作限定， 例如， 在第一次产生控制电平时， 可以是 第 p帧的后 5行扫描时 POL反转，之后第 p+1帧的后 12行扫描时 POL反转， 第 p+2帧的前 15行扫描时 POL反转， 以此类推。 具体的控制电平的宽度以 及控制电平宽度变化的时间间隔可以根据需要调整，越快完成整个 POL反转 则消除线残像的效果越好，而越慢完成整个 POL反转则闪烁影响越小。另夕卜， 由于上述步骤 101、 步骤 102和步骤 103是生成三种信号的过程， 他们之间 可以没有时间上的先后顺序关系， 只是为了描述不同的过程， 它们之间在时 间上可以是同时进行的，但步骤 103生成极性反转信号 POL的过程需要根据 已经生成的极性反转参考信号 POL，和控制信号 CTRL来进行。
本发明实施例中的极性反转驱动方法， 实现了在数帧时间内逐渐完成
POL反转， 与现有技术中在一帧时间内完成 POL反转相比， 使得 POL反转 时画面的变化更加平滑， 人眼不容易感受到闪烁。
具体地， 控制信号 CTRL由上述控制电平和非控制电平组成， 其中控制 电平为高电平， 非控制电平为低电平； 上述步骤 103、 根据极性反转参考信 号 POL，和控制信号 CTRL, 生成极性反转信号 POL的过程为： 极性反转参考 信号 POL，与控制信号 CTRL进行异或运算， 得到极性反转信号 POL。
进一步地， 如图 6所示， 本发明实施例提供一种极性反转驱动方法， 用 于液晶面板上像素极性的反转， 包括：
步骤 101、 如图 3所示， 生成极性反转参考信号 POL，， POL，用于反映所 述液晶面板上每行像素极性的选择；
步骤 102、 生成控制信号 CTRL, 控制信号 CTRL包括在 m帧中生成的 控制电平， 其中 m为大于或等于 2的整数；
步骤 1021、如图 4所示， 控制电平在 m帧每帧中的宽度按照时间顺序逐 渐增大至控制电平的宽度等于一帧的时长；
具体地， 该步骤具体为上述实施例中步骤 102的第一种方式， 在此不再 进一步地， 在步骤 1021、控制电平在 m帧每帧中的宽度按照时间顺序逐 渐增大至控制电平的宽度等于一帧的时长之后， 还包括：
步骤 1022、 如图 5所示， 控制电平在 n帧每帧中的宽度按照时间顺序由 等于一帧的时长逐渐减小至零， 其中 n为大于或等于 2的整数。
具体地， 该步骤具体为上述实施例中步骤 102的第二种方式， 在此不再 赘述。
步骤 1031、极性反转参考信号 POL，与控制信号 CTRL进行异或运算，得 到上述极性反转信号 POL。
具体地， 在步骤 1021之前， 没有控制电平， 在经过步骤 1021之后， 控 制电平占据一帧的时长， 即极性反转信号 POL完全反转， 在步骤 1022的过 程之后， 没有控制电平， 即反转后的极性反转信号 POL恢复至反转前。 在步 骤 102中交替进行步骤 1021和步骤 1022, 即通过交替循环上述控制电平不 同帧中宽度逐渐增大和减小的过程， 即实现了极性反转信号 POL的周期性反 转。
本发明实施例中的极性反转驱动方法， 实现了在数帧时间内逐渐完成
POL反转， 与现有技术中在一帧时间内完成 POL反转相比， 使得 POL反转 时画面的变化更加平滑， 人眼不容易感受到闪烁。
如图 7所示， 本发明实施例还提供一种极性反转驱动装置， 用于液晶面 板上像素极性的反转， 包括：
参考信号生成单元 1 , 用于生成极性反转参考信号， 所述极性反转参考 信号用于反映所述液晶面板上每行像素极性的选择；
控制信号生成单元 2, 用于生成控制信号， 所述控制信号包括在 m帧中 生成的控制电平， 其中 m为大于或等于 2的整数；
所述控制电平在所述 m帧每帧中的宽度按照时间顺序逐渐增大至所述控 制电平的宽度等于一帧的时长；
或者， 所述控制电平在所述 m帧每帧中的宽度按照时间顺序由等于一帧 的时长逐渐减小至零；
反转信号生成单元 3, 用于根据所述极性反转参考信号和控制信号， 生 成极性反转信号。
具体地极性反转原理和方法与上述实施例相同， 在此不再赘述。
本发明实施例中的极性反转驱动装置， 实现了在数帧时间内逐渐完成
POL反转， 与现有技术中在一帧时间内完成 POL反转相比， 使得 POL反转 时画面的变化更加平滑， 人眼不容易感受到闪烁。
具体地， 所述控制信号由所述控制电平和非控制电平组成， 所述控制电 平为高电平， 所述非控制电平为低电平；
所述反转信号生成单元 3, 具体用于将所述极性反转参考信号与所述控 制信号进行异或运算， 得到所述极性反转信号。
进一步地， 所述控制信号生成单元 2, 还用于在所述控制电平在所述 m 帧每帧中的宽度按照时间顺序逐渐增大至所述控制电平的宽度等于一帧的时 长之后， 使所述控制电平在 n帧每帧中的宽度按照时间顺序由等于一帧的时 长逐渐减小至零， 其中 n为大于或等于 2的整数。
具体的极性反转原理和方法与上述实施例相同， 在此不再赘述。
本发明实施例中的极性反转驱动装置， 实现了在数帧时间内逐渐完成 POL反转， 与现有技术中在一帧时间内完成 POL反转相比， 使得 POL反转 时画面的变化更加平滑， 人眼不容易感受到闪烁。
本发明实施例还提供一种液晶显示设备， 包括上述的极性反转驱动装置。 具体的极性反转驱动装置结构以及极性反转方法和原理与上述实施例相同， 在此不再赘述。
本发明实施例中的液晶显示设备， 实现了在数帧时间内逐渐完成 POL反 转， 与现有技术中在一帧时间内完成 POL反转相比， 使得 POL反转时画面 的变化更加平滑， 人眼不容易感受到闪烁。
通过以上的实施方式的描述， 所属领域的技术人员可以清楚地了解到本 发明的实施例可借助软件加必需的通用硬件的方式来实现， 当然也可以通过 硬件， 但很多情况下前者是更佳的实施方式。 基于这样的理解， 本发明实施 例的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形 式体现出来， 该计算机软件产品存储在可读取的存储介质中， 如计算机的软 盘， 硬盘或光盘等， 包括若干指令用以使得一台计算机设备（可以是个人计 算机， 服务器， 或者网络设备等）执行本发明各个实施例所述的方法。
以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围并不局限 可轻易想到变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明 的保护范围应以所述权利要求的保护范围为准。

Claims

权 利 要 求 书
1、 一种极性反转驱动方法， 用于液晶面板上像素极性的反转， 其特征在 于， 包括：
生成极性反转参考信号， 所述极性反转参考信号用于反映所述液晶面板 上每行像素极性的选择；
生成控制信号， 所述控制信号包括在 m帧中生成的控制电平， 其中 m为 大于或等于 2的整数；
所述控制电平在所述 m帧每帧中的宽度按照时间顺序逐渐增大至所述控 制电平的宽度等于一帧的时长；
或者， 所述控制电平在所述 m帧每帧中的宽度按照时间顺序由等于一帧 的时长逐渐减小至零；
根据所述极性反转参考信号和控制信号， 生成极性反转信号。
2、 根据权利要求 1所述的极性反转驱动方法， 其中，
所述控制信号由所述控制电平和非控制电平组成， 所述控制电平为高电 平， 所述非控制电平为低电平；
所述根据所述极性反转参考信号和控制信号， 生成极性反转信号的过程 为：
所述极性反转参考信号与所述控制信号进行异或运算， 得到所述极性反 转信号。
3、 根据权利要求 1或 2所述的极性反转驱动方法， 其中，
在所述控制电平在所述 m帧每帧中的宽度按照时间顺序逐渐增大至所述 控制电平的宽度等于一帧的时长之后， 还包括：
所述控制电平在 n帧每帧中的宽度按照时间顺序由等于一帧的时长逐渐 减小至零， 其中 n为大于或等于 2的整数。
4、 根据权利要求 1或 2所述的极性反转驱动方法， 其中，
在所述控制电平在所述 m帧每帧中的宽度按照时间顺序由等于一帧的时 长逐渐减小至零之后， 还包括：
所述控制电平在 n帧每帧中的宽度按照时间顺序由零逐渐增加至一帧的 时长， 其中 n为大于或等于 2的整数。
5、 一种极性反转驱动装置， 用于液晶面板上像素极性的反转， 其特征在 于， 包括：
参考信号生成单元， 用于生成极性反转参考信号， 所述极性反转参考信 号用于反映所述液晶面板上每行像素极性的选择；
控制信号生成单元， 用于生成控制信号， 所述控制信号包括在 m帧中生 成的控制电平， 其中 m为大于或等于 2的整数；
所述控制电平在所述 m帧每帧中的宽度按照时间顺序逐渐增大至所述控 制电平的宽度等于一帧的时长；
或者， 所述控制电平在所述 m帧每帧中的宽度按照时间顺序由等于一帧 的时长逐渐减小至零；
反转信号生成单元， 用于根据所述极性反转参考信号和控制信号， 生成 极性反转信号。
6、 根据权利要求 5所述的极性反转驱动装置， 其特征在于，
所述控制信号由所述控制电平和非控制电平组成， 所述控制电平为高电 平， 所述非控制电平为低电平；
所述反转信号生成单元， 具体用于将所述极性反转参考信号与所述控制 信号进行异或运算， 得到所述极性反转信号。
7、 根据权利要求 5或 6所述的极性反转驱动装置， 其特征在于， 所述控制信号生成单元， 还用于在所述控制电平在所述 m帧每帧中的宽 度按照时间顺序逐渐增大至所述控制电平的宽度等于一帧的时长之后， 使所 述控制电平在 n帧每帧中的宽度按照时间顺序由等于一帧的时长逐渐减小至 零， 其中 n为大于或等于 2的整数。
8、 根据权利要求 5或 6所述的极性反转驱动装置， 其特征在于， 所述控制信号生成单元， 还用于在所述控制电平在所述 m帧每帧中的宽 度按照时间顺序由等于一帧的时长逐渐减小至零之后， 还包括：
使所述控制电平在 n帧每帧中的宽度按照时间顺序由零逐渐增加至一帧 的时长， 其中 n为大于或等于 2的整数。
9、 一种液晶显示设备， 其特征在于， 包括如权利要求 5至 8中任意一项 所述的极性反转驱动装置。
PCT/CN2013/075314 2013-03-06 2013-05-08 极性反转驱动方法、驱动装置和液晶显示设备 WO2014134867A1 (zh)

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