WO2013075369A1 - 液晶显示器及其驱动方法 - Google Patents

液晶显示器及其驱动方法 Download PDF

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WO2013075369A1
WO2013075369A1 PCT/CN2011/083496 CN2011083496W WO2013075369A1 WO 2013075369 A1 WO2013075369 A1 WO 2013075369A1 CN 2011083496 W CN2011083496 W CN 2011083496W WO 2013075369 A1 WO2013075369 A1 WO 2013075369A1
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Prior art keywords
liquid crystal
transistor
crystal display
signal
electrically connected
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PCT/CN2011/083496
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English (en)
French (fr)
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侯鸿龙
贺成明
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深圳市华星光电技术有限公司
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Priority claimed from CN2011103818865A external-priority patent/CN102508374A/zh
Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to PCT/CN2011/083496 priority Critical patent/WO2013075369A1/zh
Priority to US13/380,041 priority patent/US20130135281A1/en
Publication of WO2013075369A1 publication Critical patent/WO2013075369A1/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
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • 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
    • G09G2310/04—Partial updating of the display 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
    • G09G2320/10—Special adaptations of display systems for operation with variable images
    • G09G2320/103—Detection of image changes, e.g. determination of an index representative of the image change
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving

Definitions

  • the invention relates to a liquid crystal display and a driving method thereof, in particular to a liquid crystal display capable of saving electricity and a driving method thereof.
  • liquid crystal displays have been officially replaced by cathode ray tubes, and have become mainstream display types.
  • Various electronic devices on the market such as mobile phones, personal digital assistants, digital cameras, computer screens or laptop screens, almost all use liquid crystal display screens as their display screens.
  • a liquid crystal display panel of a conventional liquid crystal display includes a plurality of pixels, and each pixel includes three pixel units respectively representing three primary colors of red, green and blue (RGB).
  • Each pixel unit includes a thin film transistor and a liquid crystal capacitor.
  • the scan signal output by the scan driving module causes the thin film transistors of the pixel units of each row to be sequentially turned on
  • the data driving module outputs corresponding data voltages to the liquid crystal capacitors of a whole row of pixel units to charge them to respective required voltages. To show different gray levels.
  • the scan driver module outputs scan pulses row by row to turn on the thin film transistors of the pixel cells of each row, and then the data drive module charges and discharges the liquid crystal capacitors of the pixel cells that are turned on in each row. In this way, until the liquid crystal capacitors of all the pixel units of the liquid crystal display panel are fully charged, charging is started from the first row.
  • the power consumption of a liquid crystal display is proportional to the picture scanning frequency and the total capacitance value of all charged liquid crystal capacitors. That is to say, the higher the screen scanning frequency or the larger the total capacitance of the charged liquid crystal capacitor, the higher the power consumption of the liquid crystal display.
  • the object of the present invention is to provide a liquid crystal display and a driving method thereof for determining whether the current frame image signal and the previous frame image signal are different when the current frame image signal and the previous frame image signal are respectively turned on. Display pixel units of different gray levels to reduce power consumption.
  • the invention discloses a liquid crystal display, which comprises a plurality of pixel units, a processing unit, a scan driving module, a data driving module, a plurality of scanning lines and a plurality of data lines, wherein the scanning driving module is electrically connected to the plurality of The scanning line is configured to generate a scan pulse, the data driving module is electrically connected to the plurality of data lines for generating a data voltage, and the processing unit is configured to generate a multi-frame image signal.
  • Each frame of the image signal includes a plurality of image signals, and the plurality of pixel units are one-to-one corresponding to the plurality of image signals.
  • the liquid crystal display further includes a plurality of auxiliary signal lines and a determining unit.
  • the determining unit is electrically connected to the plurality of auxiliary signal lines, and is configured to electrically connect through the pixel unit when determining that the image signal of the previous frame and the image signal of the previous frame image are different from each other.
  • the auxiliary signal line provides an enable signal to the pixel unit.
  • Each of the pixel units includes a first transistor electrically connected to a corresponding one of the scan lines and a corresponding one of the data lines for turning on the corresponding data line when receiving the scan pulse from the corresponding scan line a data voltage; a second transistor electrically connected to the corresponding one of the auxiliary signal lines and the first transistor for receiving the start signal from the corresponding auxiliary signal line
  • the data voltage is transmitted from the first transistor;
  • a liquid crystal capacitor is electrically connected to the second transistor, and includes a plurality of liquid crystal molecules for adjusting a rotation direction of the plurality of liquid crystal molecules according to the data voltage.
  • the liquid crystal display further includes a buffer electrically connected to the processing unit for storing the multi-frame image signal.
  • the buffer is a first in first out buffer.
  • a gate, a source, and a drain of the first transistor are electrically connected to the corresponding scan line, the corresponding data line, and a source of the second transistor, respectively.
  • the gate and the drain of the second transistor are electrically connected to the corresponding auxiliary signal line and the liquid crystal capacitor, respectively.
  • the second transistor is operative to turn off when the enable signal from the corresponding auxiliary signal line is not received.
  • the invention further discloses a method for driving a liquid crystal display, the liquid crystal display comprising a processing unit, a plurality of pixel units, a plurality of scan lines, a plurality of data lines and a plurality of auxiliary signal lines, wherein the processing unit is used to generate a plurality of Frame image signal.
  • Each frame of the image signal includes a plurality of image signals, and the plurality of pixel units are one-to-one corresponding to the plurality of image signals.
  • Each of the pixel units includes a first transistor electrically connected to a corresponding one of the scan lines and a corresponding one of the data lines; a second transistor electrically connected to the corresponding one of the auxiliary signal lines and the first transistor; a liquid crystal capacitor, The second transistor is electrically connected to comprise a plurality of liquid crystal molecules.
  • the method includes: when determining that the front frame image signal is different from the image signal provided by the previous frame image signal to the same pixel unit, providing the start signal to the auxiliary signal line electrically connected to the pixel unit The pixel unit; and when the first transistor receives a scan pulse from the corresponding scan line and the second transistor receives the enable signal from the corresponding auxiliary signal line, turning on And a data voltage sent from the corresponding data line to the liquid crystal capacitor to adjust a rotation direction of the plurality of liquid crystal molecules.
  • the liquid crystal display further includes a buffer electrically connected to the processing unit for storing the multi-frame image signal.
  • the buffer is a first in first out buffer.
  • a gate, a source, and a drain of the first transistor are electrically connected to the corresponding scan line, the corresponding data line, and a source of the second transistor, respectively.
  • the gate and the drain of the second transistor are electrically connected to the corresponding auxiliary signal line and the liquid crystal capacitor, respectively.
  • the second transistor is turned off when the second transistor does not receive the enable signal from the corresponding auxiliary signal line.
  • the present invention provides a liquid crystal display and a driving method thereof.
  • the startup signal is provided to the The pixel units of different gray levels are respectively displayed when the front frame image signal and the previous frame image signal.
  • the pixel unit is turned on only when the first transistor receives the scan pulse from the corresponding scan line and the second transistor receives the start signal from the corresponding auxiliary signal line.
  • a data voltage transmitted from the data line to the liquid crystal capacitor to adjust a rotation direction of the plurality of liquid crystal molecules. Therefore, the liquid crystal display of the present invention and the driving method thereof can reduce power consumption to achieve power saving.
  • FIG. 1 is a schematic view showing the circuit structure of a liquid crystal display of the present invention.
  • FIG. 2 is a top plan view of the pixel unit of FIG. 1.
  • FIG. 3 is an equivalent circuit diagram of the pixel unit of FIG. 1.
  • FIG. 4 illustrates an example in which the current frame image signal is not the same as the previous frame image signal.
  • FIG. 5 is a timing chart of scan pulses and enable signals provided by the scan lines and auxiliary signal lines of FIG.
  • Figure 6 is a flow chart of a method of driving the liquid crystal display 100 of the present invention.
  • FIG. 1 is a schematic diagram showing the circuit structure of a liquid crystal display device 100 of the present invention.
  • the liquid crystal display 100 includes a determining unit 101, a processing unit 102, a buffer 103, a timing controller 104, a data driving module 106, a scan driving module 108, and a liquid crystal display panel 110.
  • the liquid crystal display panel 110 includes a plurality of pixel units 130, a plurality of scanning lines 118 extending in the first direction X, a plurality of data lines 116 extending in the second direction Y, and a plurality of auxiliary signal lines 111.
  • the first direction X is perpendicular to the second direction Y.
  • the plurality of auxiliary signal lines 111 also extend in the second direction Y, but may actually extend in the first direction X.
  • the processing unit 102 can be a central processing unit of a personal computer or a notebook computer for synchronously outputting a plurality of frames of image signals to the determining unit 101, the timing controller 104, and the buffer 103. Since each frame image is composed of a plurality of pixel units 130 (for example, 1024 ⁇ 768 ⁇ 3 pixel units 130) displaying different gray levels, in this embodiment, one frame of image signals is provided in one frame display time. A combination of a plurality of image signals for all of the pixel units 130.
  • one frame of image signal indicates a combination of a plurality of image signals supplied to 1024 ⁇ 768 ⁇ 3 pixel units 130 within 1/60 second. .
  • the buffer 103 is a first in first out (First in first)
  • the out, FIFO) buffer is used to temporarily store at least two frames of image signals, that is, the previous frame image signal and the previous frame image signal.
  • the timing controller 104 is configured to generate a frequency pulse signal to the scan driving module 108, and also convert the image signal it receives into a data signal.
  • the scan driving module 108 is configured to output a scan signal according to the frequency pulse signal, and the data driving module 106 converts the data signal into data voltages of different voltage levels.
  • the data driving module 106 and the scan driving module 108 are disposed on a flexible circuit board (not shown) (Chip On film, COF), or placed on a glass substrate (not shown) (Chip of Glass, COG), then electrically connected through a flexible circuit board.
  • the scan driving module 108 sequentially generates a plurality of scan pulses through the plurality of scan lines 118 to the liquid crystal display panel 110, so that the pixels of each row of the liquid crystal display panel 110.
  • the transistors of the unit 130 (not shown) are sequentially turned on.
  • the data driving module 106 outputs a plurality of data voltages through the plurality of data lines 116 to charge the liquid crystal capacitors (not shown) of the row of pixel units 130 to the level of the data voltage to display Different gray levels.
  • the determining unit 101 is electrically connected to the plurality of auxiliary signal lines 111 for determining whether the current frame image signal is identical to the previous frame image signal. When the current frame image signal is different from the previous frame image signal, the determining unit 101 transmits the start signal to the pixel unit 130 of different gray levels when the previous frame image signal and the previous frame image signal are respectively transmitted through the plurality of auxiliary signal lines 111.
  • FIG. 2 is a top view of the pixel unit 130 of FIG. 1
  • FIG. 3 is an equivalent circuit diagram of the pixel unit 130 of FIG. 1
  • the pixel unit 130 includes a first transistor 131, a second transistor 132, a liquid crystal capacitor 133, and a storage capacitor 134.
  • the gate 131G, the source 132S, and the drain 132D of the first transistor 131 are electrically connected to the scan line 131, the data line 116, and the source 132S of the second transistor 132, respectively.
  • the gate 132G and the drain 132D of the second transistor 132 are electrically connected to the auxiliary signal line 111 and the liquid crystal capacitor 133, respectively.
  • the first transistor 131 is configured to turn on the data line 116a when receiving the scan pulse transmitted from the scan line 118a.
  • the second transistor 132 is configured to turn on the data voltage transmitted by the first transistor 131 when receiving the enable signal from the auxiliary signal line 111a.
  • the liquid crystal capacitor 133 is composed of a pixel electrode 136 and a common electrode (not shown), and the plurality of pixels 136 and the common electrode are adjusted by the data voltage and the common voltage Vcom supplied from the common electrode. The direction of rotation of liquid crystal molecules (not shown).
  • the storage capacitor 134 is then used to retain the data voltage during the period when the scan pulse is not received until the next scan pulse is received.
  • FIG. 4 illustrates an example in which the current frame image signal is different from the previous frame image signal
  • FIG. 5 is a scan provided by the scan line and the auxiliary signal line of FIG.
  • FIG. 6 is a flow chart of a method of driving the liquid crystal display 100 of the present invention.
  • the four blocks shown in FIG. 4 are image signals received by the four pixel units 130 corresponding to FIG. 2 .
  • the processing unit 102 simultaneously outputs the ith frame image signal to the buffer 103, the judging unit 101, and the timing controller 104, wherein the initial value of i is 1, and i is a positive integer (step S1).
  • the timing controller 104 After receiving the ith frame image signal, the timing controller 104 generates a frequency pulse signal to the scan driving module 108, and converts the ith frame image signal into a plurality of data signals and outputs the data signal to the data driving module 106.
  • the scan driving module 108 sequentially outputs a plurality of scan pulses to the liquid crystal display panel 110 according to the frequency pulse signal, so that the thin film transistors of the pixel units 130 of each row are sequentially turned on. While the thin film transistor of one row of pixel units 130 is turned on, the data driving module 106 outputs a plurality of data voltages according to the plurality of data signals.
  • the determining unit 101 When the determining unit 101 receives the image signal of the ith frame, it is determined whether each of the pixel units 130 corresponds to the image signal of the i-1th frame (which has been stored in the buffer 103) and whether the image signal of the ith frame is consistent (step S2). At the same time, the ith frame image signal is stored in the buffer 103.
  • the image signal of the pixel unit 130 at the upper left and the upper right is the same as the image signal at the ith frame, so the determination unit 101 does not provide the enable signal (step S3). Therefore, at the time period T0-T1, the scan pulse transmitted from the scanning line 118a turns on the first transistor 131 of the upper left and upper right pixel units 130, but the second transistor 132 is turned off because the auxiliary signal lines 111a and 111b do not transmit the enable signal. So even though data lines 116a and 116b still transfer data voltages from data drive module 106, second transistor 132 is turned off causing liquid crystal capacitors 133 to fail to receive data voltages for charging. However, the liquid crystal capacitor 133 maintains the display content of the previous frame in accordance with the charge stored in the storage capacitor 134.
  • the image signal at the lower left pixel unit 130 is different from the image signal at the ith frame, so the determination unit 101 provides an enable signal to the pixel unit 130 through the auxiliary signal line 111a (step S4). ). Therefore, during the period T1-T2, the scan pulse transmitted by the scan line 118a turns on the first transistor 131 of the pixel unit 130 at the lower left side, and the enable signal transmitted by the auxiliary signal line 111a turns on the second transistor 132, so the liquid crystal capacitor 133 receives The data line 116a is charged with a data voltage so that the liquid crystal molecules adjust their rotational direction in accordance with the data voltage (step S5).
  • step S6 the processing of the next frame image signal is continued.
  • the liquid crystal capacitor 133 of most of the pixel units 130 is not recharged, and only the liquid crystal capacitor 133 of the pixel unit 130 is smaller than the second transistor 132. Turn it on and charge again. Therefore, the liquid crystal display 100 and its driving method can reduce power consumption to achieve power saving.

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Abstract

一种液晶显示器（100）及其驱动方法，所述方法包括：当判断当前帧影像信号与前一帧影像数据信号不相同时，通过多条辅助信号线（111）将启动信号提供给在当前帧影像信号与前一帧影像信号时分别显示不同的灰阶的像素单元（130）。当像素单元（130）的第一晶体管（131）接收对应的扫描线（118）传来的扫描脉冲且第二晶体管（132）接收到对应的辅助信号线（111）传来的启动信号时，导通数据线（116）传来的数据电压至液晶电容（133），以调整多个液晶分子的转动方向。所述液晶显示器（100）可以节省电力消耗。

Description

液晶显示器及其驱动方法 技术领域
本发明涉及一种液晶显示器及其驱动方法，尤指一种可省电的液晶显示器及其驱动方法。
 背景技术
近年来，由于液晶显示器轻薄短小的特性，已经使液晶显示器正式取代阴极射线管，而成为主流的显示器种类。目前市场上各种电子设备，如移动电话、个人数字助理、数字相机、计算机屏幕或笔记本电脑屏幕，几乎都采用液晶显示屏幕作为其显示屏幕。
现有的液晶显示器的液晶显示面板包含多个像素，而每一个像素包含三个分别代表红绿蓝(RGB)三原色的像素单元构成。每一像素单元包含薄膜晶体管和液晶电容。当扫描驱动模块输出的扫描信号使得每一行的像素单元的薄膜晶体管依序开启，同时数据驱动模块则输出对应的数据电压至一整行的像素单元的液晶电容使其充电到各自所需的电压，以显示不同的灰阶。扫描驱动模块会一行接一行地输出扫描脉冲以将每一行的像素单元的薄膜晶体管打开，再由数据驱动模块对每一行开启的像素单元的液晶电容进行充放电。如此依序下去，直到液晶显示面板的所有像素单元的液晶电容都充电完成，再从第一行开始充电。
目前的液晶显示器的画面扫描频率(frame rate)主要是60赫兹(Hz)，也就是说，每一秒会显示60帧影像。为了更好的显示动态画面，目前的液晶显示器的画面扫描频率已经由传统的60Hz，逐渐开发到120Hz和240Hz的产品，它们的显示效果更优于传统60Hz的液晶显示器。越高画面扫描频率的液晶显示器表示同时间内能显示的画面越多时，运动中的影像会更流畅，可见高画面扫描频率可以提高动态影像的质量。
然而，液晶显示器的功率消耗是正比于画面扫描频率和所有被充电的液晶电容的总电容值。也就是说，画面扫描频率越高或是被充电的液晶电容的总电容值越大，都会提高液晶显示器的功率消耗。
此外，当影像变动不大时，即使使用较高刷新频率(例如120Hz、240Hz)的液晶显示器来显示影像，仍有部分相邻帧的画面实质上是不变的。然而，即使相邻两帧的画面不变，仍然需要一稳定的偏压电流对液晶电容充电，造成整个液晶显示器的功耗的变高。因此，如何更有效地降低液晶显示器的功率消耗是业界努力的目标。
 技术问题
本发明的目的是提供一种液晶显示器以及其驱动方法，用来于判断当前帧影像信号与前一帧影像信号不相同时，才会导通在前帧影像信号与前一帧影像信号时分别显示不同灰阶的像素单元，以降低功耗。
 技术解决方案
本发明揭示一种液晶显示器，其包含多个像素单元、一处理单元、一扫描驱动模块、一数据驱动模块、多条扫描线以及多条数据线，所述扫描驱动模块电性连接所述多条扫描线，用来产生扫描脉冲，所述数据驱动模块电性连接所述多条数据线，用来产生数据电压，所述处理单元用来产生多帧影像信号。每一帧影像信号包含多个影像信号，所述多个像素单元是一对一对应于所述多个影像信号。所述液晶显示器进一步包含多条辅助信号线和一判断单元。所述判断单元电性连接所述多条辅助信号线，用来于判断前帧影像信号与前一帧影像信号提供给同一像素单元的影像信号不相同时，通过所述像素单元对应电性连接的所述辅助信号线，将启动信号提供给所述像素单元。每一像素单元包含一第一晶体管，电性连接对应的一条扫描线以及对应的一条数据线，用来于接收所述对应的扫描线传来的扫描脉冲时，导通所述对应的数据线传来的数据电压；一第二晶体管，电性连接对应的一条辅助信号线以及所述第一晶体管，用来于接收所述对应的辅助信号线传来的所述启动信号时，导通所述第一晶体管传来的所述数据电压；一液晶电容，电性连接所述第二晶体管，其包含多个液晶分子，用来依据所述数据电压调整所述多个液晶分子的转动方向。
根据本发明的实施例，所述液晶显示器另包含一缓存器，电性连接所述处理单元，用来储存所述多帧影像信号。所述缓存器是一先进先出缓存器。
根据本发明的实施例，所述第一晶体管的栅极、源极以及漏极分别电性连接所述对应的扫描线、所述对应的数据线以及所述第二晶体管的源极，所述第二晶体管的栅极以及漏极分别电性连接所述对应的辅助信号线以及所述液晶电容。
根据本发明的实施例，所述第二晶体管用来于在未接收所述对应的辅助信号线传来的所述启动信号时关闭。
本发明另揭示一种驱动液晶显示器的方法，所述液晶显示器包含一处理单元、多个像素单元、多条扫描线、多条数据线以及多条辅助信号线，所述处理单元用来产生多帧影像信号。每一帧影像信号包含多个影像信号，所述多个像素单元是一对一对应于所述多个影像信号。每一像素单元包含一第一晶体管，电性连接对应的一条扫描线以及对应的一条数据线；一第二晶体管，电性连接对应的一条辅助信号线以及所述第一晶体管；一液晶电容，电性连接所述第二晶体管，其包含多个液晶分子。所述方法包含：当判断前帧影像信号与前一帧影像信号提供给同一像素单元的影像信号不相同时，通过所述像素单元对应电性连接的所述辅助信号线，将启动信号提供给所述像素单元；以及当所述第一晶体管接收所述对应的扫描线传来的扫描脉冲且所述第二晶体管接收到所述对应的辅助信号线传来的所述启动信号时，导通所述对应的数据线传来的数据电压至所述液晶电容，以调整所述多个液晶分子的转动方向。
根据本发明的实施例，所述液晶显示器另包含一缓存器，电性连接所述处理单元，用来储存所述多帧影像信号。所述缓存器是一先进先出缓存器。
根据本发明的实施例，所述第一晶体管的栅极、源极以及漏极分别电性连接所述对应的扫描线、所述对应的数据线以及所述第二晶体管的源极，所述第二晶体管的栅极以及漏极分别电性连接所述对应的辅助信号线以及所述液晶电容。
根据本发明的实施例，当所述第二晶体管未接收所述对应的辅助信号线传来的所述启动信号时，关闭所述第二晶体管。
有益效果
相较于现有技术，本发明提供一种液晶显示器以及其驱动方法，于判断当前帧影像信号与前一帧影像信号不相同时，通过所述多条辅助信号线，将启动信号提供给在前帧影像信号与前一帧影像信号时分别显示不同灰阶的像素单元。而像素单元只有在所述第一晶体管接收所述对应的扫描线传来的扫描脉冲且所述第二晶体管接收到所述对应的辅助信号线传来的所述启动信号时，才导通所述数据线传来的数据电压至所述液晶电容，以调整所述多个液晶分子的转动方向。因此本发明的液晶显示器和其驱动方法可以降低功耗以达到省电的目的。
 附图说明
图1是本发明液晶显示器的电路结构示意图。
图2是图1像素单元的俯视图。
图3是图1像素单元的等效电路图。
图4绘示当前帧影像信号与前一帧影像信号并不相同的范例。
图5是图2的扫描线与辅助信号线所提供的扫描脉冲与启动信号的时序图。
图6是驱动本发明液晶显示器100的方法流程图。
 本发明的最佳实施方式
在说明书及权利要求书中使用了某些词汇来指称特定的组件。所属领域中具有通常知识者应可理解，制造商可能会用不同的名词来称呼同样的组件。本说明书及权利要求并不以名称的差异来作为区别组件的方式，而是以组件在功能上的差异来作为区别的基准。在通篇说明书及权利要求当中所提及的“包含”为一开放式的用语，故应解释成“包含但不限定于”。此外，“电性连接”一词在此是包含任何直接及间接的电气连接手段。因此，若文中描述一第一装置电性连接于一第二装置，则代表该第一装置可直接连接于该第二装置，或透过其它装置或连接手段间接地连接至该第二装置。
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施之特定实施例。本发明所提到的方向用语，例如“上”、“下”、“前”、“后”、“左”、“右”、“顶”、“底”、“水平”、“垂直”等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。
请参阅图1，图1是本发明液晶显示器100的电路结构示意图。液晶显示器100包含一判断单元101、一处理单元102、一缓存器103、一时序控制器104、一数据驱动模块106、一扫描驱动模块108以及一液晶显示面板110。液晶显示面板110包含多个像素单元(pixel)130、多条沿第一方向X延伸的扫描线118、多条沿第二方向Y延伸的数据线116以及多条辅助信号线111。第一方向X是垂直于第二方向Y。在本实施例中，多条辅助信号线111也是朝第二方向Y延伸，但实际上也可以朝第一方向X延伸。
处理单元102可以为个人计算机或是笔记本电脑的中央处理器，用来同步地输出数帧影像信号至判断单元101、时序控制器104以及缓存器103。由于每一帧影像是由多个显示不同灰阶的像素单元130(例如1024×768×3个像素单元130)所组成，在本实施例中，一帧影像信号表示在一帧显示时间内提供给所有像素单元130的多个影像信号的组合。以分辨率为1024×768且画面更新频率为60Hz的液晶显示器100为例，一帧影像信号表示在1/60秒内，提供给1024×768×3个像素单元130的多个影像信号的组合。
缓存器103是一先进先出(First in first out，FIFO)缓存器，用来暂存至少两帧影像信号，也就是前帧影像信号以及前一帧影像信号。当缓存器103即将存满时，会先把最早存入的影像信号删除，再存入另一帧影像信号。时序控制器104用于产生频率脉冲信号至扫描驱动模块108，也会将其接收的影像信号转换成数据信号。扫描驱动模块108用于根据频率脉冲信号输出扫描信号，数据驱动模块106会将上述数据信号转换成不同电压准位的数据电压。数据驱动模块106以及扫描驱动模块108设置于软性电路板(未图示)上(Chip on film，COF)，或是设置在玻璃基板(未图示)上(Chip of glass，COG)，然后再透过软性电路板电连接。时序控制器104产生的频率信号脉冲传送至扫描驱动模块108时，扫描驱动模块108会依序产生多个扫描脉冲通过多条扫描线118至液晶显示面板110，使得液晶显示面板110每一行的像素单元130的晶体管(图未示)依序开启。在一行像素单元130的晶体管开启的同时，数据驱动模块106通过多条数据线116输出多个数据电压使该行像素单元130的液晶电容(图未示)充电到数据电压的准位，以显示不同的灰阶。
判断单元101电性连接多条辅助信号线111，用于判断当前帧影像信号与前一帧影像信号是否相同。当前帧影像信号与前一帧影像信号不相同时，判断单元101通过多条辅助信号线111传送启动信号至在前帧影像信号与前一帧影像信号时分别显示不同灰阶的像素单元130。
请参阅图2及图3，图2是图1像素单元130的俯视图，图3是图1像素单元130的等效电路图。像素单元130包含一第一晶体管131、一第二晶体管132、一液晶电容133以及一存储电容134。第一晶体管131的栅极131G、源极132S以及漏极132D分别电性连接扫描线131、数据线116以及第二晶体管132的源极132S。第二晶体管132的栅极132G以及漏极132D分别电性连接辅助信号线111以及液晶电容133。以电性连接扫描线118a、数据线116a、和辅助信号线111a的像素单元130为例，第一晶体管131用来于接收扫描线118a传来的扫描脉冲时，导通数据线116a传来的数据电压。第二晶体管132用来于接收辅助信号线111a传来的启动信号时，导通第一晶体管131传来的数据电压。液晶电容133是由像素电极136以及共通电极(未图示)所构成，藉由所述数据电压和所述共通电极提供的共通电压Vcom来调整像素电极136以及所述共通电极之间的多个液晶分子(未图示)的转动方向。存储电容134则用来在未收到扫描脉冲期间，保留所述数据电压，直到收到下一个扫描脉冲为止。
请参阅图3、图4、图5和图6，图4绘示当前帧影像信号与前一帧影像信号并不相同的范例，图5是图2的扫描线与辅助信号线所提供的扫描脉冲与启动信号的时序图，图6是驱动本发明液晶显示器100的方法流程图。为便于说明，在图4绘示的四个方块是对应到图2所绘示的四个像素单元130所接收的影像信号。处理单元102会同时输出第i帧影像信号予缓存器103、判断单元101和时序控制器104，其中i的初始值为1，且i为正整数(步骤S1)。时序控制器104接收上述第i帧影像信号后，产生一频率脉冲信号至扫描驱动模块108，并将第i帧影像信号转换成多个数据信号输出给上述数据驱动模块106。扫描驱动模块108根据频率脉冲信号依序输出多个扫描脉冲至液晶显示面板110，使每一行的像素单元130的薄膜晶体管依序开启。在一行像素单元130的薄膜晶体管开启的同时，数据驱动模块106根据上述多个数据信号输出多个数据电压。
当判断单元101接收到第i帧影像信号时，会判断每一个像素单元130对应于第i-1帧影像信号(已存储于缓存器103内)和第i帧影像信号是否一致(步骤S2)，同时第i帧影像信号会存储于缓存器103内。
以图4为例，位于左上方和右上方的像素单元130在第i-1帧时的影像信号和第i帧时的影像信号相同，所以判断单元101不会提供启动信号(步骤S3)。所以在时段T0-T1时，扫描线118a传递的扫描脉冲开启左上方和右上方的像素单元130的第一晶体管131，但是第二晶体管132因为辅助信号线111a和111b没有传递启动信号而关闭。所以即使数据线116a和116b仍从数据驱动模块106传送数据电压，但是第二晶体管132关闭导致液晶电容133无法收到数据电压来充电。但是液晶电容133会依据存储电容134所储存的电荷而保持在前一帧的显示内容。
而位在左下方的像素单元130在第i-1帧时的影像信号和第i帧时的影像信号不相同，所以判断单元101会通过辅助信号线111a提供启动信号予像素单元130(步骤S4)。所以在时段T1-T2时，扫描线118a传递的扫描脉冲开启左下方的像素单元130的第一晶体管131，且辅助信号线111a传递的启动信号开启第二晶体管132，所以液晶电容133会收到数据线116a传来数据电压而充电，使得液晶分子依据该数据电压调整其转动方向(步骤S5)。
等到上述步骤S4、S5完成后，再继续处理下一帧影像信号(步骤S6)。
在上述实施例中，仅用四个像素单元130来说明本发明的运作原理。当第i帧影像信号与第i-1帧影像信号差异不大时，大多数像素单元130的液晶电容133都不会再次充电，只有少部分像素单元130的液晶电容133会因为第二晶体管132的开启而再次充电。因此液晶显示器100和其驱动方法可以降低功耗以达到省电的目的。
综上所述，虽然本发明已以较佳实施例揭露如上，但该较佳实施例并非用以限制本发明，该领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。
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Claims (10)

1一种液晶显示器，其包含多个像素单元、一处理单元、一扫描驱动模块、一数据驱动模块、多条扫描线以及多条数据线，所述扫描驱动模块电性连接所述多条扫描线，用来产生扫描脉冲，所述数据驱动模块电性连接所述多条数据线，用来产生数据电压，所述处理单元用来产生多帧影像信号，每一帧影像信号包含多个影像信号，所述多个像素单元是一对一对应于所述多个影像信号，其特征在于，所述液晶显示器进一步包含：
多条辅助信号线，电性连接所述多个像素单元；
一判断单元，电性连接所述多条辅助信号线，用来于判断前帧影像信号与前一帧影像信号提供给同一像素单元的影像信号不相同时，通过所述像素单元对应电性连接的所述辅助信号线，将启动信号提供给所述像素单元；以及
每一像素单元包含：
一第一晶体管，电性连接对应的一条扫描线以及对应的一条数据线，用来于接收所述对应的扫描线传来的扫描脉冲时，导通所述对应的数据线传来的数据电压；
一第二晶体管，电性连接对应的一条辅助信号线以及所述第一晶体管，用来于接收所述对应的辅助信号线传来的所述启动信号时，导通所述第一晶体管传来的所述数据电压；以及
一液晶电容，电性连接所述第二晶体管，其包含多个液晶分子，用来依据所述数据电压调整所述多个液晶分子的转动方向。
根据权利要求1所述的液晶显示器，其特征在于：另包含一缓存器，电性连接所述处理单元，用来储存所述多帧影像信号。
根据权利要求2所述的液晶显示器，其特征在于：所述缓存器是一先进先出缓存器。
根据权利要求1所述的液晶显示器，其特征在于：所述第一晶体管的栅极、源极以及漏极分别电性连接所述对应的扫描线、所述对应的数据线以及所述第二晶体管的源极，所述第二晶体管的栅极以及漏极分别电性连接所述对应的辅助信号线以及所述液晶电容。
根据权利要求1所述的液晶显示器，其特征在于：所述第二晶体管用来于在未接收所述对应的辅助信号线传来的所述启动信号时关闭。
一种驱动液晶显示器的方法，所述液晶显示器包含一处理单元、多个像素单元、多条扫描线、多条数据线以及多条辅助信号线，所述处理单元用来产生多帧影像信号，每一帧影像信号包含多个影像信号，所述多个像素单元是一对一对应于所述多个影像信号，其特征在于，每一像素单元包含：一第一晶体管，电性连接对应的一条扫描线以及对应的一条数据线；
一第二晶体管，电性连接对应的一条辅助信号线以及所述第一晶体管；
一液晶电容，电性连接所述第二晶体管，其包含多个液晶分子；
所述方法包含：
当判断前帧影像信号与前一帧影像信号提供给同一像素单元的影像信号不相同时，通过所述像素单元对应电性连接的所述辅助信号线，将启动信号提供给所述像素单元；以及
当所述第一晶体管接收所述对应的扫描线传来的扫描脉冲且所述第二晶体管接收到所述对应的辅助信号线传来的所述启动信号时，导通所述对应的数据线传来的数据电压至所述液晶电容，以调整所述多个液晶分子的转动方向。
根据权利要求6所述的驱动液晶显示器的方法，其特征在于：所述液晶显示器另包含一缓存器，电性连接所述处理单元，用来储存所述多帧影像信号。
根据权利要求7所述的驱动液晶显示器的方法，其特征在于：所述缓存器是一先进先出缓存器。
根据权利要求6所述的驱动液晶显示器的方法，其特征在于：所述第一晶体管的栅极、源极以及漏极分别电性连接所述对应的扫描线、所述对应的数据线以及所述第二晶体管的源极，所述第二晶体管的栅极以及漏极分别电性连接所述对应的辅助信号线以及所述液晶电容。
根据权利要求6所述的驱动液晶显示器的方法，其特征在于：
当所述第二晶体管未接收所述对应的辅助信号线传来的所述启动信号时，关闭所述第二晶体管。
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