WO2014048000A1 - 液晶显示装置的驱动方法及其驱动系统 - Google Patents

液晶显示装置的驱动方法及其驱动系统 Download PDF

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Publication number
WO2014048000A1
WO2014048000A1 PCT/CN2012/083642 CN2012083642W WO2014048000A1 WO 2014048000 A1 WO2014048000 A1 WO 2014048000A1 CN 2012083642 W CN2012083642 W CN 2012083642W WO 2014048000 A1 WO2014048000 A1 WO 2014048000A1
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Prior art keywords
image signal
frequency
target frequency
source image
display device
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PCT/CN2012/083642
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English (en)
French (fr)
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廖良展
陈宥烨
陈胤宏
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深圳市华星光电技术有限公司
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Priority to US13/703,631 priority Critical patent/US20140092081A1/en
Publication of WO2014048000A1 publication Critical patent/WO2014048000A1/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
    • 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
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G09G3/003—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background to produce spatial visual effects
    • 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
    • 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
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0248—Precharge or discharge of column electrodes before or after applying exact column voltages
    • 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
    • G09G2320/0252—Improving the response speed
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
    • G09G2340/0435—Change or adaptation of the frame rate of the video stream

Definitions

  • the present invention relates to the field of liquid crystal display, and more particularly to a driving method of a liquid crystal display device and a driving system therefor.
  • Liquid crystal display devices are popular among consumers because of their low energy consumption and small size. Since the deflection reaction speed of the liquid crystal is not fast enough, the display effect is not good enough, so that an overvoltage drive is used to accelerate the reaction speed of the liquid crystal.
  • overvoltage driving the amount of extra voltage applied is determined by the previous image state and the current image state. That is, the amount of voltage of the overvoltage driving is determined based on the last pixel in the image of the previous frame and the first pixel of the image of the current frame.
  • an overvoltage driving table needs to be set in the liquid crystal display device to conform to the corresponding overvoltage output to obtain the desired screen gray scale.
  • the output frequency will also change accordingly. Therefore, due to the different output frequencies, the overvoltage driving will be inaccurate, which will result in the gray scale brightness of the display.
  • the gamma curve is poor, which in turn increases image crosstalk. If the overvoltage driving table with different frequencies will consume a large amount of memory, it will bring about an increase in cost, which is not conducive to cost control.
  • the technical problem to be solved by the present invention is to provide a driving method of a liquid crystal display device which reduces crosstalk and saves cost, and a driving system thereof.
  • a driving method of a liquid crystal display device comprising the steps of: A: When the format of the received source image signal is different from the preset target frequency, the frequency of the received source image signal is converted, and the display frequency is converted to a target frequency of 65 Hz to generate an image of the target frequency. signal;
  • S1 generating a new frame picture, inserting a new frame picture evenly into a frame picture in the source image signal in a frequency cycle to make the frequency of the image signal the same as the target frequency;
  • S2 Select a partial picture from the source image signal, discard the selected partial picture, and select the discarded partial picture to be averaged from the frame picture in one frequency cycle of the source image signal.
  • a driving method of a liquid crystal display device comprising the steps of:
  • A when the format of the received source image signal is different from the preset target frequency, the frequency of the received source image signal is frequency-converted, and the display frequency thereof is converted into a target frequency to generate an image signal of the target frequency;
  • An overvoltage driving output is performed using an overvoltage driving table that matches the target frequency of the target image signal.
  • the target frequency is greater than 45 Hz.
  • the target frequency is greater than 60 Hz. Since the two frequency systems commonly used in the prior art are 50 Hz and 60 Hz, it is preferable that the target frequency is greater than 60 Hz, that is, it is not necessary to discard the source image signal, so that the human eye has a better effect when viewed.
  • the target frequency is 65 Hz.
  • the target frequency is preferably 65 Hz, because the two frequency systems commonly used in the prior art are 50 Hz and 60 Hz, 50 Hz only needs to compensate 1 frame every 3 frames, and 60 Hz only needs 1 frame after every 11 frames.
  • Picture, 65 Hz can be placed at a small interval Rounding, in order to match the two mainstream formats, fewer screens need to be inserted, and only one picture compensation mode is used to design the package.
  • the experimental data shows that when the target frequency is selected at 65 Hz, better visual effects can be achieved and the user's flickering feeling can be reduced.
  • the following steps are also performed:
  • S1 A new frame picture is generated and inserted into the source image signal so that the frequency of the image signal is the same as the target frequency. By adding a new frame picture, the frequency of the source image signal reaches the target frequency, thereby adapting to a set of overvoltage driving tables.
  • a new frame picture is averaged into a frame between the frame signals in the source image signal in one frequency cycle.
  • the average insertion method makes the screen display more smooth. You can select a relatively simple or complex compensation screen according to the number of frames you need to insert, and get better display results.
  • the new frame picture inserted into the source image signal is all black, or all white, or the calculated motion detection compensation picture, or the previous frame picture, or the next frame picture.
  • the number of screens that can be inserted into the frame can be selected to be relatively simple or complex, and a better display effect can be obtained.
  • the following steps are also performed:
  • S2 Select a partial picture from the source image signal and discard the selected partial picture.
  • the part of the screen selected for discarding is averaged from the frame picture in one frequency period of the source image signal.
  • a driving system for a liquid crystal display device comprising: a conversion module for converting a source image signal having a different frequency from a target frequency into a preset target frequency, wherein the display device uses a set of overvoltage driving tables matched with a target frequency .
  • the invention converts a source image signal having a different frequency from a target frequency into an image signal having a target frequency, so that the liquid crystal display device only needs to use a set of overvoltage driving tables to display images for different frequencies without causing Gray scale brightness curve is not good, saving a lot of memory and then Save costs.
  • the left and right eye image signals of different frequencies can share a set of overvoltage driving tables by converting to the target frequency, thereby reducing flickering and crosstalk.
  • 2D display it can adapt to other frequency image input and make the display achieve better display effect.
  • FIG. 1 is a schematic diagram of a driving method of a liquid crystal display device of the present invention
  • FIG. 2 is a schematic view showing the composition of a driving system of the liquid crystal display device of the present invention
  • FIG. 3 is a schematic diagram of a source image signal conversion and system structure according to the first embodiment of the present invention
  • FIG. 4 is a schematic diagram of a left eye source image signal conversion according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of image conversion of a right eye source image according to an embodiment of the present invention.
  • Figure 7 is a comparison of visual perception of signals of different frequencies
  • Figure 8 is a block diagram showing the structure of a driving system of a liquid crystal display device according to a third embodiment of the present invention.
  • the present invention discloses a driving method of a liquid crystal display device, which includes the following steps: A: When a received source image signal is different from a preset target frequency, the received source image signal is received. The system performs frequency conversion, converts its display frequency into a target frequency, and generates a target image signal; B: performs an overvoltage drive output using an overvoltage driving table that matches the target frequency of the target image signal.
  • the present invention also discloses a driving system of a liquid crystal display device: including a conversion module 20 for converting a source image signal having a different frequency from a target frequency into a preset target frequency, and an overvoltage driving module 30.
  • the overvoltage drive module 30 uses only one set of overvoltage drive meters for use with the target frequency.
  • the invention converts a source image signal having a different frequency from a target frequency into an image signal having a target frequency, so that the liquid crystal display device only needs to use a set of overvoltage driving tables to target different frequencies.
  • the image signal is displayed without causing a poor gray scale brightness curve, saving a large amount of memory and thus saving costs.
  • the left and right eye image signals of different frequencies can share a set of overvoltage driving tables by converting to the target frequency, thereby reducing flickering and crosstalk.
  • 2D display it can adapt to other frequency image input and make the display achieve better display effect.
  • step A if the frequency of the source image signal is less than the target frequency, the step is further performed: S1: By generating a new frame picture and inserting into the source image signal, the frequency of the image signal is the same as the target frequency.
  • step A if the frequency of the source image signal is greater than the target frequency, the steps are further performed: S2: Select a partial picture from the source image signal, and discard the selected partial picture.
  • the present invention is further described by way of an embodiment of a driving system of a specific liquid crystal display device.
  • the driving system of the liquid crystal display device includes: a conversion module 20 and an overvoltage driving module 30.
  • the conversion module includes: a buffer processing module 21 and a compensation module 22.
  • the buffer processing module 21 is provided with: a buffer controller of two screens, a buffer memory connected to the buffer controller, and a fixed frequency clock;
  • the compensation module 22 includes: a compensator, a static buffer memory, and a buffer , X frame picture counter and data output port.
  • the left-eye source image signal data of the 60-Hz 3D shutter display device is converted into a target image signal having a target frequency of 65 Hz, and the left-eye data enters the buffer processing module 21.
  • the buffer control area of each picture uses the fixed frequency clock to simultaneously detect and store the Nth picture and the N+1th picture motion in the buffer memory.
  • the Nth picture and the N+1th picture are simultaneously input into the compensator and the buffer in the compensation module 22, and the compensation picture X is generated in the compensation module 22 and stored in the static buffer memory, and the picture in the buffer Normal output, at this time, use the X frame picture counter to control the data output port to control the compensation picture at the appropriate timing output (ie, insert the source image signal, and compensate the picture at the appropriate timing (ie, the calculated timing of inserting the compensation picture X).
  • X is inserted between the Nth frame and the N+1th picture and output simultaneously.
  • the output frame is stored in the picture memory by the overvoltage driving module 10 and is compared with the overvoltage driving table. Out of control.
  • the above is an example of entering the overvoltage driving output after processing the image signal of the left eye source image of 60 Hz in the present embodiment, and the compensation method is the same if the right eye signal of 50 Hz is used.
  • the frequency of the left and right eye signals is not limited to the numerical values given in the embodiment.
  • the new frame picture inserted into the source image signal that is, the compensation picture X is all black, or all white, or the calculated motion detection compensation picture, or the previous frame picture, or the next frame. Picture. If the number of pictures to be inserted is small, the black, all white or the previous frame or the next frame of the single can be selected. If the number of insertions is large, the motion detection compensation screen generated by the calculation can be selected. So that there is a better display.
  • the number of insertion compensation pictures X is selected according to the difference between the frequency of the source image signal and the target frequency, and the insertion timing may be an average insertion, a random insertion, or insertion at a specific point.
  • the source image signal of 60 Hz in the left eye is to be converted into a target frequency of 65 Hz. It is necessary to insert a 5-frame compensation picture X.
  • the new frame picture is inserted into the local frame in one frequency cycle.
  • the inter-frame mode in the source image signal, that is, a compensation picture X is inserted after every 11 frames. As shown in Fig.
  • the conversion of the source image signal of 50 Hz in the right eye to the target frequency of 65 Hz requires insertion of 15 frames, and therefore, a compensation picture X is inserted after every 3 frames.
  • the average insertion method makes the screen display more smooth.
  • the compensated motion curve produces some small jitter, but it is not obvious under 3D viewing. Since this embodiment selects the signals of the two commonly used frequency systems, respectively, 50 Hz and 60 Hz, and 50 and 60 are exactly 5 common divisors, in order to better match the average insertion of the compensated picture, the target frequency is the most Good is also a common divisor of 5, and 65 Hz chosen in this embodiment is exactly the common divisor of 5.
  • the target frequency can also be selected to be 55 Hz, but two modes are required to change the source image signal to the target frequency, that is, one mode is the compensated picture mode, and the other mode is to discard the picture mode, which increases the design. Difficulty and cost. At 65 Hz, it can be rounded at a small interval, and only the compensation picture mode can be used, and there are fewer pictures to be inserted in order to match the two mainstream systems.
  • FIG. 7 is a schematic diagram of comparison with human flicker perception after performing Fourier transform on the luminance signal of the liquid crystal screen at different frequencies. Through the picture The data of the table shows that when the target frequency is selected at 65 Hz, a better visual effect can be achieved, and the user's flickering feeling is lowered. Therefore, the target frequency selected in this embodiment is 65 Hz.
  • the compensation frame frame is made to reach the target frequency corresponding to the overvoltage driving module 30 in the source image signal, so that the overvoltage driving module 30 can correctly perform overvoltage driving.
  • the selection of the target frequency should be greater than 45 Hz, so that the human eye can not perceive the flicker. Of course, it is better than 60 Hz, so that the human eye can have a better effect when viewed.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the difference from the first embodiment is that the left-eye source image signal is 60 frames and the target frequency is 55 Hz. Therefore, the source image signal is processed by discarding 5 frames, thereby making it and the target The frequency is the same. At this time, the 5 frames of the source image signal are removed by the compensation module.
  • the removal mode is also performed by averaging from 60 frames of the original image signal in one frequency cycle, that is, according to The time axis displayed on the screen is extracted from each frame by an average of several frames.
  • the processing of the right eye signal is also the same, that is, the corresponding frame picture can be added or subtracted.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • the source image signal system and the frequency of the target image signal in the first embodiment and the second embodiment are both determined, so that it is not necessary to judge the signal.
  • the image signal judging module is added to implement an overvoltage driving table for driving output for different source image signals.
  • the driving system of the liquid crystal display device includes: a judging module 10, a conversion module 20, and an overvoltage driving module 30.
  • the driving process can be expressed as follows:
  • A determining whether the received source image signal system needs to perform frequency conversion, and if so, converting the display frequency to the target frequency to generate a target image signal; if not, the source image signal is the target image signal;

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Abstract

公开了一种液晶显示装置的驱动方法及其驱动系统。所述方法包括步骤：A：当接收到的源图像信号的制式与预设的目标频率不同时，对接收到的源图像信号的制式进行频率转换，将其显示频率转换为目标频率，生成目标频率的图像信号；B：使用与目标图像信号的目标频率配合的一个过压驱动表进行过压驱动输出。通过将频率与目标频率不同的源图像信号转换成具有目标频率的图像信号，这样，液晶显示装置只需要使用一组过压驱动表就可以针对不同频率的图像信号进行显示而不会导致灰阶亮度曲线不佳，节省了大量的记忆体从而节省了成本。

Description

液晶显示装置的驱动方法及其驱动系统
【技术领域】
本发明涉及液晶显示领域， 更具体的说， 涉及一种液晶显示装置的驱动方 法及其驱动系统。
【背景技术】
液晶显示装置由于其耗能少、 体积小等原因， 受到广泛消费者的热爱。 由于液晶的偏转反应速度不够快， 这样造成显示效果不够好， 因而出现了 过压驱动用以加快液晶的反应速度。 在过压驱动中， 所加载的额外的电压量由 先前的图像状态和当前的图像状态决定。 即根据上一帧的图像中最后一个像素 以及当前帧的图像的第一个像素来决定所述过压驱动的电压量。
由于不同画面的灰阶不同， 过压驱动所需要的电压值也不同， 因此需要在 液晶显示装置中设置一个过压驱动表， 以符合相应的过压输出， 得到预期的画 面灰阶。 但随着不同频率的输入， 以 3D快门式液晶显示装置为例， 输出频率也 会跟着变动， 这样， 由于输出频率不同， 将会造成过压驱动的不准确， 这样将 导致显示的灰阶亮度曲线（gamma curve ) 不佳， 进而使图像串扰（crosstalk ) 增加。 如果通过增加不同频率的过压驱动表则会耗费大量的记忆体， 则会带来 成本的增加， 不利于成本的控制。
当然， 对于显示 2D图像时， 在输入频率不同时， 由于过压驱动的不准确， 也会产生显示的灰阶亮度曲线不佳， 达不到预期的显示效果。
【发明内容】
本发明所要解决的技术问题是提供一种降低串扰、 节约成本的液晶显示装 置的驱动方法及其驱动系统。
本发明的目的是通过以下技术方案来实现的： 一种液晶显示装置的驱动方 法， 包括步骤： A: 当接收到的源图像信号的制式与预设的目标频率不同时， 对接收到的源 图像信号的制式进行频率转换， 将其显示频率转换为 65赫兹的目标频率， 生成 目标频率的图像信号；
B:使用与目标图像信号的目标频率配合的一个过压驱动表进行过压驱动输 出；
所述的步骤 A中，
若源图像信号的频率小于目标频率， 则还执行以下步骤：
S1 : 生成新的帧画面， 在一个频率周期内， 将新的帧画面平均的插入到所 述源图像信号中的帧画面间使图像信号的频率与目标频率相同，；
若源图像信号的频率大于目标频率， 则还执行以下步骤：
S2: 从源图像信号中选择部分画面， 丟弃所选择的部分画面， 选择丟弃的 部分画面是从源图像信号中一个频率周期内的帧画面中平均抽取的。
本发明的目的还可以通过以下技术方案来实现： 一种液晶显示装置的驱动 方法， 包括步骤：
A: 当接收到的源图像信号的制式与预设的目标频率不同时， 对接收到的源 图像信号的制式进行频率转换， 将其显示频率转换为目标频率， 生成目标频率 的图像信号；
B:使用与目标图像信号的目标频率配合的一个过压驱动表进行过压驱动输 出。
优选的， 所述目标频率大于 45赫兹。
优选的， 所述目标频率大于 60赫兹。 由于现有技术中常用的两种频率制式 为 50赫兹与 60赫兹， 因此优选目标频率大于 60赫兹，即不必丟弃源图像信号， 使人眼观看时有较好的效果。
优选的， 所述目标频率为 65赫兹。 目标频率优选为 65赫兹， 是由于现有 技术中常用的两种频率制式为 50赫兹与 60赫兹， 50赫兹只需要每 3帧补偿 1 帧画面， 而 60赫兹只需每 11帧后加 1帧画面， 65赫兹刚好可以以较小的间隔 取整， 为匹配这两种主流制式需要插入的画面较少， 仅采用一种画面补偿模式， 设计筒单。 并且， 通过实验数据显示， 当目标频率选择在 65赫兹时， 能够达到 更佳的视觉效果， 减少用户的闪烁感。
优选的， 所述的步骤 A中， 若源图像信号的频率小于目标频率， 则还执行 以下步骤：
S1 : 生成新的帧画面， 并插入到源图像信号中使图像信号的频率与目标频 率相同。 通过增加新的帧画面使源图像信号的频率达到目标频率， 从而适应一 组过压驱动表。
优选的， 所述步骤 S1中， 在一个频率周期内， 将新的帧画面平均的插入到 所述源图像信号中的帧画面间。 平均插入的方式可以使画面显示更显流畅。 可 根据需要插入帧画面的数量选择相对筒单或复杂的补偿画面， 进而得到较好的 显示效果。
优选的， 所述插入到源图像信号中的新的帧画面为全黑、 或全白、 或计算 生成的动作侦测补偿画面、 或上一帧画面、 或下一帧画面。 可 居需要插入帧 画面的数量选择相对筒单或复杂的补偿画面， 进而得到较好的显示效果。
优选的， 所述的步骤 A中， 若源图像信号的频率大于目标频率， 则还执行 以下步骤：
S2: 从源图像信号中选择部分画面， 丟弃所选择的部分画面。
优选的， 所述步骤 S2中， 选择丟弃的部分画面是从源图像信号中一个频率 周期内的帧画面中平均抽取的。
一种液晶显示装置的驱动系统， 其设有用于将频率与目标频率不同的源图 像信号转换成预设的目标频率的转换模块， 所述显示装置使用一组与目标频率 配合的过压驱动表。
本发明通过将频率与目标频率不同的源图像信号转换成具有目标频率的图 像信号， 这样， 液晶显示装置只需要使用一组过压驱动表就可以针对不同频率 的图像信号进行显示而不会导致灰阶亮度曲线不佳， 节省了大量的记忆体进而 节省了成本。 对于 3D显示装置来说， 不同频率左右眼图像信号的可以通过转换 成目标频率而共用一组过压驱动表，降低闪烁感以及串扰。而对于 2D显示来说， 可以适应其它的频率的图像输入， 并使显示达到更优的显示效果。
【附图说明】
图 1是本发明所述液晶显示装置驱动方法的原理图；
图 2是本发明所述液晶显示装置的驱动系统的组成示意图；
图 3是本发明实施例一所述源源图像信号转换及系统结构示意图； 图 4是本发明实施例一左眼源图像信号转换示意图；
图 5是本发明实施例一右眼源图像信号转换示意图；
图 6是本发明实施例一图像信号转换后的信号波动图表；
图 7是不同频率信号的视觉感受对比图；
图 8是本发明实施例三的液晶显示装置的驱动系统组成示意图。
【具体实施方式】
下面结合附图和较佳的实施例对本发明作进一步说明。
如图 1所示，本发明公开一种液晶显示装置的驱动方法，包括以下步骤： A: 当接收到的源图像信号的制式与预设的目标频率不同时， 对接收到的源图像信 号的制式进行频率转换，将其显示频率转换为目标频率，生成目标图像信号； B: 使用与目标图像信号的目标频率配合的过压驱动表进行过压驱动输出。
如图 2所示， 本发明同时公开一种液晶显示装置的驱动系统： 包括用于将 频率与目标频率不同的源图像信号转换成预设的目标频率的转换模块 20, 以及 过压驱动模块 30,该过压驱动模块 30仅使用一组与所述目标频率配合使用的过 压驱动表。
本发明通过将频率与目标频率不同的源图像信号转换成具有目标频率的图 像信号， 这样， 液晶显示装置只需要使用一组过压驱动表就可以针对不同频率 的图像信号进行显示而不会导致灰阶亮度曲线不佳， 节省了大量的记忆体进而 节省了成本。 对于 3D显示装置来说， 不同频率左右眼图像信号的可以通过转换 成目标频率而共用一组过压驱动表，降低闪烁感以及串扰。而对于 2D显示来说， 可以适应其它的频率的图像输入， 并使显示达到更优的显示效果。
对于步骤 A, 若源图像信号的频率小于目标频率， 则还执行步骤： S1: 通 过生成新的帧画面， 并插入到源图像信号中使图像信号的频率与目标频率相同。
对于步骤 A, 若源图像信号的频率大于目标频率， 则还执行步骤： S2: 从 源图像信号中选择部分画面， 丟弃所选择的部分画面。
根据该上述驱动方法， 本发明通过一个具体的液晶显示装置的驱动系统的 实施例来进行进一步描述。
实施例一
如图 2所示， 液晶显示装置的驱动系统包括： 转换模块 20以及过压驱动模 块 30。 如图 3所示， 转换模块包括： 緩沖处理模块 21以及补偿模块 22。 所述 緩沖处理模块 21内设置有： 两个画面的緩沖控制器、 与所述緩沖控制器连接的 緩沖记忆体以及固定频率时钟； 所述补偿模块 22包括： 补偿器、 静态緩沖记忆 体、 緩沖器、 X帧画面计数器以及数据输出端口。
如图 3所示， 本实施例以 60赫兹的 3D快门式显示装置的左眼源图像信号 数据转换成目标频率为 65赫兹的目标图像信号进行说明， 当左眼数据进入緩沖 处理模块 21的两个画面的緩沖控制区，利用固定频率时钟同时将第 N个画面与 第 N+1个画面动作侦测并存储于緩沖记忆体内。 之后同时将第 N个画面以及第 N+1个画面输入补偿模块 22中的补偿器以及緩沖器内， 并在补偿模块 22内生 成补偿画面 X同时存储于静态緩沖记忆体内， 緩沖器内的画面正常输出， 此时 利用 X帧画面计数器控制数据输出端口以控制补偿画面在恰当的时机输出 （即 插入源图像信号中， 在适当的时机（即计算得到的插入补偿画面 X的时机）将 补偿画面 X插入到第 N帧画面及第 N+1画面之间， 与之同时输出。 输出的各帧 画面经过过压驱动模块 10存储于画面记忆体内并通过与过压驱动表对比进行输 出控制。
以上是本实施例中 60赫兹左眼源图像信号数据处理后进入过压驱动输出的 举例， 而若以 50赫兹的右眼信号来说， 其补偿方式也与之相同。 当然， 左右眼 信号的频率并不限于本实施例所举的数值。
本实施例中，所述插入到源图像信号中的新的帧画面即补偿画面 X为全黑、 或全白、 或计算生成的动作侦测补偿画面、 或上一帧画面、 或下一帧画面。 若 需要插入的画面数量较少， 则可选择筒单的如全黑、 全白或上一帧或下一帧画 面， 若需要插入数量较多， 则可选择计算生成的动作侦测补偿画面， 以使有较 好的显示。
本实施例中， 插入补偿画面 X的数量根据源图像信号的频率与目标频率的 差值来选择， 而其插入时机可以是平均的插入， 也可以是随机的插入， 或者在 特定的点进行插入。 如图 4所示， 左眼 60赫兹的源图像信号要转换成 65赫兹 的目标频率需要插入 5帧补偿画面 X, 本实施例采用在一个频率周期内， 将新 的帧画面平均的插入到所述源图像信号中的帧画面间方式， 即在每 11帧画面后 插入一补偿画面 X。 如图 5所示， 右眼 50赫兹的源图像信号转换成 65赫兹的 目标频率需要插入 15帧画面， 因此， 在每 3帧画面后插入一补偿画面 X。 平均 插入的方式可以使画面显示更显流畅。 如图 6所示， 补偿后的运动曲线会产生 些微小的抖动， 但在 3D观看下， 并不明显。 由于本实施例选择的是常用的两种 频率制式的信号， 分别为 50赫兹和 60赫兹， 而 50与 60正好为 5的公约数， 为了更好的进行匹配补偿画面的平均插入， 目标频率最好也为 5 的公约数， 本 实施例所选择 65赫兹正好是 5的公约数。 或者， 目标频率还可以选择 55赫兹， 但是需要两种模式将源图像信号改变至该目标频率， 即一种模式是补偿画面模 式， 另一种模式是丟弃画面模式， 这样即增大了设计难度和成本。 而以 65赫兹 刚好可以以较小的间隔取整， 且只用补偿画面模式即可， 且为匹配这两种主流 制式需要插入的画面较少。 另外， 如图 7所示， 图 7为对不同的频率下对液晶 屏的亮度信号进行傅里叶变换后， 与人的闪烁度感知对照的示意图。 通过该图 表的数据显示， 当目标频率选择在 65赫兹时， 能够达到更佳的视觉效果， 用户 的闪烁感降低， 因此， 本实施例所选目标频率为 65赫兹。
本实施例中， 通过在源图像信号进行补偿帧画面使之达到与过压驱动模块 30相对应的目标频率， 以使过压驱动模块 30能够正确的进行过压驱动。 而对于 目标频率的选择应当大于 45赫兹以上， 以使人眼不能感知到闪烁， 当然， 最好 大于 60赫兹， 以使人眼观看时有较好的效果。
实施例二：
作为发明实施例二， 与实施例一的区别在于， 左眼源图像信号为 60帧， 而 目标频率为 55赫兹， 因此， 源图像信号的处理方式是丟弃 5帧画面， 从而使其 与目标频率一致。 此时， 通过补偿模块将源图像信号中的 5 帧画面进行去除， 当然， 其去除方式也是通过从原图像信号中一个频率周期内即 60个帧画面中进 行平均抽取的， 也就是说， 按照画面显示的时间轴， 平均每隔几个画面就从中 抽取一帧丟弃。 对于右眼信号的处理方式也是相同， 即或增或减掉相应的帧画 面即可。
实施例三：
实施例一及实施例二中的源图像信号制式以及目标图像信号的频率都是确 定的， 因此不需要进行信号的判断。
而对于本实施例来说， 增加了图像信号的判断模块， 以便针对不同的源图 像信号实现一个过压驱动表进行驱动输出。 如图 8所示， 液晶显示装置的驱动 系统包括： 判断模块 10、 转换模块 20以及过压驱动模块 30。 其驱动过程可表 示如下：
A: 判断接收到的源图像信号的制式是否需要进行频率转换， 若是， 将其显 示频率转换为目标频率， 生成目标图像信号； 若否， 则源图像信号即为目标图 像信号；
B:使用与目标图像信号的目标频率配合的一个过压驱动表进行过压驱动输 出。 以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明， 不 能认定本发明的具体实施只局限于这些说明， 比如， 若源图像画面的频率与目 标频率一致， 则在补偿模块中将不做处理。 对于本发明所属技术领域的普通技 术人员来说， 在不脱离本发明构思的前提下， 还可以做出若干筒单推演或替换， 都应当视为属于本发明的保护范围。

Claims

权利要求
1、 一种液晶显示装置的驱动方法， 包括步骤：
A: 当接收到的源图像信号的制式与预设的目标频率不同时， 对接收到的源 图像信号的制式进行频率转换， 将其显示频率转换为 65赫兹的目标频率， 生成 目标频率的图像信号；
B:使用与目标图像信号的目标频率配合的一个过压驱动表进行过压驱动输 出；
所述的步骤 A中，
若源图像信号的频率小于目标频率， 则还执行以下步骤：
S1 : 生成新的帧画面， 在一个频率周期内， 将新的帧画面平均的插入到所 述源图像信号中的帧画面间使图像信号的频率与目标频率相同，；
若源图像信号的频率大于目标频率， 则还执行以下步骤：
S2: 从源图像信号中选择部分画面， 丟弃所选择的部分画面， 选择丟弃的 部分画面是从源图像信号中一个频率周期内的帧画面中平均抽取的。
2、 一种液晶显示装置的驱动方法， 包括步骤：
A: 当接收到的源图像信号的制式与预设的目标频率不同时， 对接收到的源 图像信号的制式进行频率转换， 将其显示频率转换为目标频率， 生成目标频率 的图像信号；
B:使用与目标图像信号的目标频率配合的一个过压驱动表进行过压驱动输 出。
3、 如权利要求 2所述的液晶显示装置的驱动方法， 其中， 所述目标频率大 于 45赫兹。
4、 如权利要求 3所述的液晶显示装置的驱动方法， 其中， 所述目标频率大 于 60赫兹。
5、 如权利要求 4所述的液晶显示装置的驱动方法， 其中， 所述目标频率为 65赫兹。
6、如权利要求 2所述的液晶显示装置的驱动方法，其中，所述的步骤 A中， 若源图像信号的频率小于目标频率， 则还执行以下步骤：
S1 : 生成新的帧画面， 并插入到源图像信号中使图像信号的频率与目标频 率相同。
7、 如权利要求 6所述的液晶显示装置的驱动方法， 其中， 所述步骤 S1中， 在一个频率周期内， 将新的帧画面平均的插入到所述源图像信号中的帧画面间。
8、 如权利要求 6所述的液晶显示装置的驱动方法， 其中， 所述插入到源图 像信号中的新的帧画面为全黑、 或全白、 或计算生成的动作侦测补偿画面、 或 上一帧画面、 或下一帧画面。
9、如权利要求 2所述的液晶显示装置的驱动方法，其中，所述的步骤 A中， 若源图像信号的频率大于目标频率， 则还执行以下步骤：
S2: 从源图像信号中选择部分画面， 丟弃所选择的部分画面。
10、如权利要求 9所述的液晶显示装置的驱动方法，其中，所述步骤 S2中， 选择丟弃的部分画面是从源图像信号中一个频率周期内的帧画面中平均抽取 的。
11、 一种液晶显示装置的驱动系统， 其设有用于将频率与目标频率不同的 源图像信号转换成预设的目标频率的转换模块， 所述显示装置使用一组与目标 频率配合的过压驱动表。
12、 如权利要求 11所述的液晶显示装置的驱动系统， 其中， 所述转换模块 包括： 緩沖处理模块以及与緩沖处理模块连接的画面补偿模块。
13、 如权利要求 12所述的液晶显示装置的驱动系统， 其中， 所述緩沖处理 模块设置有两个画面的緩沖控制器、 与所述緩沖控制器连接的緩沖记忆体以及 固定频率时钟。
14、 如权利要求 12所述的液晶显示装置的驱动系统， 其中， 所述补偿模块 包括： 补偿器、 与所述补偿器连接的静态緩沖记忆体、 緩沖器、 补偿画面计数 器， 以及分别与所述緩沖器、 补偿器、 补偿画面计数器连接的数据输出端口。
15、 如权利要求 11所述的液晶显示装置的驱动系统， 其中， 还包括用于判 断源图像信号的制式的图像信号判断模块。
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