WO2012113166A1 - 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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Publication number
WO2012113166A1
WO2012113166A1 PCT/CN2011/071706 CN2011071706W WO2012113166A1 WO 2012113166 A1 WO2012113166 A1 WO 2012113166A1 CN 2011071706 W CN2011071706 W CN 2011071706W WO 2012113166 A1 WO2012113166 A1 WO 2012113166A1
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Prior art keywords
switches
data lines
switch
liquid crystal
crystal display
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PCT/CN2011/071706
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English (en)
French (fr)
Inventor
王念茂
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 to DE112011104967T priority Critical patent/DE112011104967T5/de
Priority to US13/128,551 priority patent/US20120218316A1/en
Publication of WO2012113166A1 publication Critical patent/WO2012113166A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3614—Control of polarity reversal in general
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3685—Details of drivers for data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0297—Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
    • 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
    • G09G2330/023—Power management, e.g. power saving using energy recovery or conservation

Definitions

  • the present invention relates to a liquid crystal display and a method of driving the same.
  • LCD monitors have become widely used in a variety of electronic devices such as televisions, mobile phones, personal digital assistants (PDAs), digital cameras, computer screens or notebook screens.
  • PDAs personal digital assistants
  • a display with a high resolution color screen is a display with a high resolution color screen.
  • FIG. 1 is a circuit diagram of a prior art liquid crystal display 10.
  • the liquid crystal display 10 includes a timing controller 14, a data driver 16, and a scan driver (gate Driver) 18 and liquid crystal display panel 20.
  • the scan driver 18 When the frequency signal pulse generated by the timing controller 14 is transmitted to the scan driver 18, the scan driver 18 generates a scan signal to the liquid crystal display panel 20, while the timing controller 14 issues a frequency signal pulse to the data driver 16, and the data
  • the driver 16 outputs a gray scale voltage to the pixel unit 22 of the liquid crystal display panel 20.
  • Each pixel unit 22 of the liquid crystal display panel 20 can be equivalent to a resistor and a capacitor (referred to as a liquid crystal capacitor). Circuit combination.
  • the gray scale voltage charges the capacitor to the desired voltage level, so that the liquid crystal molecules between the capacitors display different gray scales according to the voltage level.
  • the liquid crystal display panel 20 usually uses dot inversion (dot Inversion) is driven by the driver.
  • the driving method is to transmit gray scale voltages of opposite polarities to adjacent two pixel units 22. When the level of the gray scale voltage is greater than the common voltage, the gray scale voltage is positive polarity, and vice versa, when the gray scale voltage level is less than When the voltage is common, the gray scale voltage is negative.
  • the common voltage is half of the supply voltage applied to the data driver 16.
  • FIG. 2 is a schematic diagram of gray scale voltage and gray scale distribution.
  • the data driver 16 In order to respectively display black and white on the liquid crystal display panel 20 by using a positive gray scale voltage, the data driver 16 outputs a potential V1 away from the common voltage and a potential V2 close to the common voltage, respectively. In contrast, in order to respectively display black and white on the liquid crystal display panel 20 by using a negative gray scale voltage, the data driver 16 outputs a potential V4 away from the common voltage and a potential V3 close to the common voltage, respectively. If a pixel unit receives a positive gray scale voltage V1 and displays black at a certain screen, and maintains the same gray scale at the next screen, the pixel unit needs to receive a negative gray scale voltage V4. In order to change the potential applied to the pixel unit from V1 to V4 in a very short charging time, a large current must be generated, thus increasing power consumption. In the era of environmental protection, how to reduce power consumption is the goal of the industry.
  • the invention provides a liquid crystal display comprising a plurality of data lines, a data driver and a plurality of pixel units. Each data line is connected to a pixel unit, the data driver includes a plurality of amplifiers, and the data driver is configured to write a gray scale voltage on adjacent data lines in a dot inversion driving manner, the liquid crystal display further including a connection a switching circuit between the data driver and the plurality of data lines, the switching circuit including a first charge sharing capacitor, a second charge sharing capacitor, a plurality of first switches, a plurality of second switches, a plurality of third switches, and a plurality of The fourth switch.
  • the plurality of first switches are electrically connected to the odd-numbered data lines for turning on the odd-numbered data lines and the first charge-sharing capacitors for a first predetermined period, and are turned off during a second predetermined period, and The odd number data line and the second charge sharing capacitor are turned on during a third predetermined period.
  • the plurality of second switches are electrically connected to the even-numbered data lines for turning on the even-numbered data lines and the second charge-sharing capacitors during the first predetermined period, and are disconnected during the second predetermined period And turning on the even-numbered data line and the first charge-sharing capacitor during the third predetermined period.
  • Each of the third switches is disposed between two adjacent data lines for turning on the even-numbered data lines and the odd-numbered data lines during the second predetermined period.
  • Each fourth switch is coupled between each amplifier and a corresponding data line for conducting the amplifier and the plurality of pixel units during a charge.
  • the liquid crystal display further includes a timing controller, wherein the timing controller is configured to generate a first switching signal and a second switching signal, wherein the first switching signal is used to control the first switch and the second The switch is turned on and off, and the second switch signal is used to control the on/off of the third switch.
  • the data driver is adapted to write a gray scale voltage to the data line during charging, the three predetermined periods being set between adjacent two charging periods.
  • the timing controller further generates a drive signal for controlling the on/off of the fourth switch.
  • the first switch and the second switch are both bidirectional switches, and the third switch and the fourth switch are unidirectional switches.
  • the invention provides a liquid crystal display comprising a plurality of data lines, a data driver, and a plurality of pixel units. Each data line is connected to a pixel unit, and the data driver is configured to write a gray scale voltage on the adjacent data line in a dot inversion driving manner, the liquid crystal display further comprising a data driver and a plurality of data lines
  • the switching circuit includes a first charge sharing capacitor, a second charge sharing capacitor, a plurality of first switches, a plurality of second switches, and a plurality of third switches.
  • the plurality of first switches are electrically connected to the odd-numbered data lines for turning on the odd-numbered data lines and the first charge-sharing capacitors for a first predetermined period, and are turned off during a second predetermined period, and The odd number data line and the second charge sharing capacitor are turned on during a third predetermined period.
  • the plurality of second switches are electrically connected to the even-numbered data lines for turning on the even-numbered data lines and the second charge-sharing capacitors during the first predetermined period, during the second predetermined period Turning on, and turning on the even-numbered data line and the first charge-sharing capacitor during the third predetermined period.
  • Each of the third switches is disposed between two adjacent data lines for turning on the even-numbered data lines and the odd-numbered data lines during the second predetermined period.
  • the liquid crystal display further includes a timing controller, wherein the timing controller is configured to generate a first switching signal and a second switching signal, wherein the first switching signal is used to control the first switch and the second The switch is turned on and off, and the second switch signal is used to control the on/off of the third switch.
  • the data driver is adapted to write a gray scale voltage to the data line during charging, the three predetermined periods being set between adjacent two charging periods.
  • the first switch and the second switch are both bidirectional switches, and the third switch is a unidirectional switch.
  • the switching circuit is integrated within the data driver.
  • the present invention further provides a liquid crystal display driving method, the liquid crystal display comprising a plurality of data lines, a data driver and a plurality of pixel units, each of the data lines being connected to a pixel unit, wherein the data driver is used for driving in a dot inversion
  • a method of writing a gray scale voltage on an adjacent data line comprising the steps of: the liquid crystal display providing a plurality of first switches electrically connected to the odd number data lines, electrically connecting the even number data lines And a plurality of second switches and a plurality of third switches disposed between the two adjacent data lines.
  • the three predetermined periods occur between two adjacent charging periods, the charging period corresponding to a period during which the data driver writes a gray scale voltage to the data line.
  • the first switch and the second switch are both bidirectional switches, and the third switch is a unidirectional switch.
  • the liquid crystal display further provides a plurality of fourth switches, wherein the data driver comprises a plurality of amplifiers, each fourth switch being connected between each amplifier and a corresponding data line for guiding during charging Passing the amplifier and the plurality of pixel units.
  • the plurality of fourth switches are unidirectional switches.
  • the liquid crystal display of the present invention further includes a switching circuit that causes the voltage of the data line to be converted to the magnitude of the gray scale voltage to be written in advance before the data line is written to the gray scale voltage.
  • the data driver only needs a small bias current to charge the pixel unit on the data line to the desired level, so the power consumption of the liquid crystal display of the present invention is low.
  • the liquid crystal display of the present invention further includes a switching circuit that causes the voltage of the data line to be converted to the magnitude of the gray scale voltage to be written in advance before the data line is written to the gray scale voltage.
  • the data driver only needs a small bias current to charge the pixel unit on the data line to the desired level, so the power consumption of the liquid crystal display of the present invention is low.
  • FIG. 1 is a circuit diagram of a prior art liquid crystal display.
  • FIG. 2 is a schematic diagram of gray scale voltage and gray scale distribution of the liquid crystal display shown in FIG. 1.
  • FIG. 3 is a circuit diagram of a preferred embodiment of a liquid crystal display of the present invention.
  • FIG. 4 is a circuit diagram of a switching circuit, a data driver, and a liquid crystal display panel of the liquid crystal display shown in FIG.
  • Fig. 5 is a timing chart for controlling a control signal of the switching circuit shown in Fig. 4.
  • FIG. 3 is a schematic circuit diagram of a liquid crystal display device 100 according to a preferred embodiment of the present invention.
  • the liquid crystal display 100 can be a screen of a personal computer or a screen of a notebook computer.
  • the liquid crystal display 100 includes a switch circuit 102, a timing controller 104, a data driver 106, a scan driver 108, and a liquid crystal display panel 110.
  • the scan driver 108 When the vertical synchronizing signal generated by the timing controller 104 is transmitted to the scan driver 108, the scan driver 108 generates a scan signal to be transmitted to the liquid crystal display panel 110 via the scan lines G1-Gn, while the timing controller 104 issues a horizontal sync signal.
  • the data driver 106 outputs the gray scale voltage to the pixel unit 120 of the liquid crystal display panel 110 via the data lines D1-Dm.
  • the timing controller 104 further outputs a first switch signal S1, a second switch signal S2, and a drive signal Vdrive to the switch circuit 102.
  • Each pixel unit 120 includes a liquid crystal capacitor 124 (please refer to FIG. 4 together) for displaying an image.
  • the data driver 106 outputs a bias current such that the liquid crystal capacitance 124 of the pixel unit 120 of one row is charged to the level of the gray scale voltage to display different gray levels.
  • the liquid crystal display panel 110 is using dot inversion (dot Inversion) is driven by the driver.
  • the adjacent two pixel units 120 are receiving gray scale voltages of opposite polarities.
  • the switch circuit 102 is disposed between the data driver 106 and the plurality of data lines D1-Dm. Its function is to control the electrical connection relationship of each of the data lines D1-Dm before the pixel unit 120 is charged every time, so that the voltage of the data line is forwarded. The size of the gray scale voltage to be written is changed to achieve power saving.
  • FIG. 4 is a circuit diagram of the switch circuit 102, the data driver 106, and the liquid crystal display panel 110 of FIG. 3.
  • FIG. 5 is a timing chart of control signals of the switch circuit 102 of FIG.
  • the data driver 106 includes a plurality of amplifiers 122.
  • the switch circuit 102 includes a plurality of first switches T1 electrically connected to the odd-numbered data lines D2s-1, a plurality of second switches T2 electrically connected to the even-numbered data lines D2s, and a plurality of adjacent data lines D2s.
  • the first switch T1 and the second switch T2 are both bidirectional switches.
  • the third switch T3 is a unidirectional switch.
  • the first switch T1 and the second switch T2 are controlled by the first switching signal S1
  • the third switch T3 is controlled by the second switching signal S2
  • the fourth switch T4 is controlled by the driving signal Vdrive. Since the liquid crystal display 100 is driven by dot inversion, the polarities of the gray scale voltages transmitted by the odd-numbered data lines D2s-1 and the even-numbered data lines D2s are opposite. Taking FIG.
  • the odd-numbered data line D2s-1 transmits a negative gray scale voltage
  • the even-numbered data line D2s transmits a positive gray scale voltage
  • the odd-numbered data line D2s-1 transmits a positive gray scale voltage
  • the even-numbered data line D2s transmits a negative gray scale voltage.
  • the switching circuit 102 will adjust the levels of the odd and even data lines D2s-1, D2s to save power consumption, please refer to the following Description.
  • the drive signal Vdrive that controls the fourth switch T4 is at a low level, and the fourth switch T4 is turned off, so the data driver 106 does not write the gray scale voltage to the data lines D1-Dm.
  • the fourth switch T4 is turned off, and the first switch T1, the second switch T2, and the third switch T3 are also turned off, so the data driver 106 does not write the gray scale voltage to the data lines D1-Dm during this period.
  • the switch circuit 102 also does not operate, and the data driver 106 latches the gray scale voltage of the next charging period t5-t6 to write the gray scale voltage to the data lines D1-Dm during the next charging period t5-t6.
  • the third switch T3 receives the second switching signal S2 at a low level (eg, a ground potential), and the first switch T1 and the second switch T2 receive the first level V1.
  • the plurality of third switches T3 are turned off.
  • the plurality of first switches T1 turn on the odd-numbered data lines D2s-1 and the first charge-sharing capacitor C1.
  • the plurality of second switches T2 turn on the even-numbered data line D2s and the second charge-sharing capacitor C2.
  • the capacitance values of the first sharing capacitor C1 and the second sharing capacitor C2 are much larger than the load capacitances of the data lines D2s, D2s-1 and the liquid crystal capacitors 124 of the pixel unit 120, so the odd-numbered data lines D2s-1 The charge is transferred to the first sharing capacitor C1, and the charge on the even data line D2s is transferred to the second sharing capacitor C2.
  • the odd-numbered data line D2s-1 transmits the negative-order gray-scale voltage during the charging period t0-t1
  • the potential of the first shared capacitor C1 after the charge sharing is lower than the common voltage
  • the even-numbered data line D2s is The positive gray scale voltage is transmitted, so the potential of the second shared capacitor C2 after the charge sharing is higher than the common voltage.
  • the third switch T3 receives the second switch signal S2 at a high level, and the first switch T1 and the second switch T2 receive the second level (eg, ground potential) A switching signal S1.
  • the plurality of first switches T1 and the plurality of second switches T2 are turned off, and the plurality of third switches T3 turn on all the data lines such that the odd-numbered data lines D2s-1 and the even-numbered data lines D2s are at the same level due to electrical connection .
  • the third switch T3 receives the second switch signal S2 at a low level, and the first switch T1 and the second switch T2 receive the first switch signal S1 at the third level V2. .
  • the plurality of third switches T3 are turned off.
  • the plurality of first switches T1 turn on the odd-numbered data line D2s-1 and the second charge-sharing capacitor C2.
  • the plurality of second switches T2 turn on the even-numbered data line D2s and the first charge-sharing capacitor C1.
  • the potential of the first sharing capacitor C1 is lower than the common voltage during the period t2-t3
  • the potential of the second sharing capacitor C2 is higher than the common voltage, so before the next charging period (that is, the fourth predetermined period) t5-t6, the odd number
  • the level of the data line D2s-1 is pulled up by the second charge sharing capacitor C2 slightly higher than the common voltage, and the level of the even number data line D2s is pulled lower by the first charge sharing capacitor C1 and slightly lower than the common voltage.
  • the odd-numbered data line D2s-1 needs to transmit a positive gray scale voltage
  • the even-numbered data line D2s needs to transmit a negative gray scale voltage.
  • the level of the odd-numbered data line D2s-1 has been slightly higher than the common voltage, and the level of the even-numbered data line D2s is slightly lower than the common voltage, so the data driver 106 only needs a small bias current to allow
  • the pixel unit 120 on the odd-numbered data line D2s-1 or the even-numbered data line D2s is charged to a desired level, so that the liquid crystal display of the present invention can reduce power consumption compared to the prior art.
  • the liquid crystal display of the present invention is not limited to the above embodiments.
  • the switch circuit 102 can also be integrated in the data driver 106, and the operation principle is the same.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
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  • Liquid Crystal Display Device Control (AREA)
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Description

液晶显示器及其驱动方法 技术领域
本发明是有关于一种液晶显示器及其驱动方法。
 背景技术
功能先进的显示器渐成为现今消费电子产品的重要特色，其中液晶显示器已经逐渐成为各种电子设备如电视、行动电话、个人数字助理(PDA)、数字相机、计算机屏幕或笔记型计算机屏幕所广泛应用具有高分辨率彩色屏幕的显示器。
请参阅图1，图1是一种现有技术液晶显示器10的电路示意图。液晶显示器10包含时序控制器14、数据驱动器(source driver)16、扫描驱动器(gate driver)18以及液晶显示面板20。时序控制器14产生的频率信号脉冲传送至扫描驱动器18时，扫描驱动器18会产生扫描信号至液晶显示面板20，在此同时，时序控制器14则会发出频率信号脉冲至数据驱动器16，而数据驱动器16就会输出灰阶电压至液晶显示面板20的像素单元22。
液晶显示面板20的每一像素单元22可等效为电阻以及电容 (视为液晶电容) 的电路组合。灰阶电压使得电容充电至所要电压准位，以使得电容之间的液晶分子依据电压准位转动而显示不同的灰阶。液晶显示面板20通常使用点反转(dot inversion)的驱动方式驱动。该驱动方法是将相反极性的灰阶电压传送给相邻两像素单元22，当灰阶电压的电平大于公共电压时，灰阶电压为正极性，反之，当灰阶电压的电平小于公共电压时，灰阶电压为负极性。通常，公共电压是施加于数据驱动器16的电源电压的一半。
请参阅图2，图2是灰阶电压与灰阶分布的示意图。为了通过使用正极性的灰阶电压在液晶显示面板20上分别显示黑色和白色，数据驱动器16会分别输出远离公共电压的电位V1与或是接近公共电压的电位V2。相对地，为了通过使用负极性的灰阶电压在液晶显示面板20上分别显示黑色和白色，数据驱动器16会分别输出远离公共电压的电位V4与或是接近公共电压的电位V3。如果在某一画面时一像素单元是接收正极性的灰阶电压V1而显示黑色，而在下一画面时，要维持同样的灰阶，则该像素单元需接收负极性的灰阶电压V4。为了在极短暂的充电时间内将施加于该像素单元的电位由V1变为V4，则必须要产生较大的电流，因此会增加功率消耗。在讲求环保的时代里，如何降低功率消耗是业界努力的目标。
 技术问题
为了解决现有技术液晶显示器功耗较大的技术问题，有必要提供一种功耗较低的液晶显示器。
 技术解决方案
本发明提供的一种液晶显示器，其包括多条数据线、数据驱动器和多个像素单元。每一数据线连接一像素单元，所述数据驱动器包括多个放大器，所述数据驱动器用来以点反转驱动方式在相邻数据线上写入灰阶电压，所述液晶显示器进一步包括一连接于数据驱动器与多条数据线之间的开关电路，上述开关电路包括第一电荷分享电容、第二电荷分享电容、多个第一开关、多个第二开关、多个第三开关和多个第四开关。所述多个第一开关电性连接奇数号数据线，用来在一第一预定期间导通所述奇数号数据线及所述第一电荷分享电容，在一第二预定期间断开，并在一第三预定期间导通所述奇数号数据线及所述第二电荷分享电容。所述多个第二开关电性连接偶数号数据线，用来在所述第一预定期间导通所述偶数号数据线及所述第二电荷分享电容，在所述第二预定期间断开，并在所述第三预定期间导通所述偶数号数据线及所述第一电荷分享电容。每一第三开关设置于两相邻的数据线之间，用来在所述第二预定期间导通所述偶数号数据线和奇数号数据线。每一第四开关连接在每一放大器与对应数据线之间，用来在一充电期间导通所述放大器与所述多个像素单元。
依据本发明的实施例，上述液晶显示器进一步包括一时序控制器，上述时序控制器用来产生一第一开关信号和一第二开关信号，上述第一开关信号用于控制上述第一开关和第二开关的通断，上述第二开关信号用于控制上述第三开关的通断。
依据本发明的实施例，上述数据驱动器用于在充电期间写入灰阶电压至数据线，上述三个预定期间设于相邻两个充电期间之间。
依据本发明的实施例，所述时序控制器进一步产生一用于控制上述第四开关通断的驱动信号。
依据本发明的实施例，所述第一开关和第二开关均为双向开关，所述第三开关和所述第四开关为单向开关。
本发明提供一种液晶显示器，其包括多条数据线、数据驱动器、多个像素单元。每一数据线连接一像素单元，所述数据驱动器用来以点反转驱动方式在相邻数据线上写入灰阶电压，所述液晶显示器进一步包括一连接于数据驱动器与多条数据线之间的开关电路，上述开关电路包括第一电荷分享电容、第二电荷分享电容、多个第一开关、多个第二开关和多个第三开关。所述多个第一开关电性连接奇数号数据线，用来在一第一预定期间导通所述奇数号数据线及所述第一电荷分享电容，在一第二预定期间断开，并在一第三预定期间导通所述奇数号数据线及所述第二电荷分享电容。所述多个第二开关，电性连接偶数号数据线，用来在所述第一预定期间导通所述偶数号数据线及所述第二电荷分享电容，在所述第二预定期间断开，并在所述第三预定期间导通所述偶数号数据线及所述第一电荷分享电容。每一第三开关设置于两相邻的数据线之间，用来在所述第二预定期间导通所述偶数号数据线和奇数号数据线。
依据本发明的实施例，上述液晶显示器进一步包括一时序控制器，上述时序控制器用来产生一第一开关信号和一第二开关信号，上述第一开关信号用于控制上述第一开关和第二开关的通断，上述第二开关信号用于控制上述第三开关的通断。
依据本发明的实施例，上述数据驱动器用于在充电期间写入灰阶电压至数据线，上述三个预定期间设于相邻两个充电期间之间。
依据本发明的实施例，所述第一开关和第二开关均为双向开关，所述第三开关为单向开关。
依据本发明的实施例，所述开关电路集成于所述数据驱动器之内。
本发明又提供一种液晶显示器驱动方法，所述液晶显示器包括多条数据线、一数据驱动器和多个像素单元，每一数据线连接一像素单元，所述数据驱动器用来以点反转驱动方式在相邻数据线上写入灰阶电压，所述方法包含以下步骤：所述液晶显示器提供电性连接所述奇数号数据线的多个第一开关、电性连接所述偶数号数据线的多个第二开关、和设置于两相邻的数据线之间的多个第三开关。在所述第一预定期间，控制所述多个第一开关导通奇数号数据线及所述第一电荷分享电容，并控制所述多个第二开关导通所述偶数号数据线及所述第二电荷分享电容。在所述第二预定期间，控制所述多个第三开关导通所述偶数号数据线和奇数号数据线，控制所述多个第一开关断开所述奇数号数据线及所述第一电荷分享电容，并控制所述多个第二开关断开所述偶数号数据线及所述第二电荷分享电容。在所述第三预定期间，控制所述多个第一开关导通所述奇数号数据线及所述第二电荷分享电容，并控制所述多个第二开关导通所述偶数号数据线及所述第一电荷分享电容。
依据本发明的实施例，上述三个预定期间发生于相邻两个充电期间之间，所述充电期间对应于上述数据驱动器将灰阶电压写入至数据线的期间。
依据本发明的实施例，所述第一开关和第二开关均为双向开关，所述第三开关为单向开关。
依据本发明的实施例，所述液晶显示器另提供多个第四开关，上述数据驱动器包括多个放大器，每一第四开关连接在每一放大器与对应数据线之间，用来在充电期间导通所述放大器与所述多个像素单元。所述多个第四开关为单向开关。
相较于现有技术，本发明液晶显示器进一步包括一开关电路，上述开关电路使数据线在被写入灰阶电压之前，数据线上的电压预先向将要写入的灰阶电压的大小转变。如此一来，数据驱动器只需要较小的偏压电流就可以让数据线上的像素单元充电到所要的电平因此本发明液晶显示器功率损耗较低。
 有益效果
相较于现有技术，本发明液晶显示器进一步包括一开关电路，上述开关电路使数据线在被写入灰阶电压之前，数据线上的电压预先向将要写入的灰阶电压的大小转变。如此一来，数据驱动器只需要较小的偏压电流就可以让数据线上的像素单元充电到所要的电平因此本发明液晶显示器功率损耗较低。
 附图说明
图1是一种现有技术液晶显示器的电路示意图。
图2是图1所示液晶显示器的灰阶电压与灰阶分布的示意图。
图3是本发明液晶显示器一较佳实施方式的电路示意图。
图4是图3所示液晶显示器的开关电路、数据驱动器和液晶显示面板的电路图。
图5是控制图4所示开关电路的控制信号的时序图。
 本发明的最佳实施方式
请参阅图3，图3是本发明液晶显示器100一较佳实施方式的电路示意图。液晶显示器100可为个人计算机的屏幕或是笔记本电脑的屏幕。液晶显示器100包含开关电路102、时序控制器104、数据驱动器106、扫描驱动器108以及液晶显示面板110。时序控制器104产生的垂直同步信号传送至扫描驱动器108时，扫描驱动器108会产生扫描信号经由扫描线G1-Gn传送至液晶显示面板110，在此同时，时序控制器104则会发出水平同步信号至数据驱动器106，而数据驱动器106就会经由数据线D1-Dm输出灰阶电压至液晶显示面板110的像素单元120。时序控制器104另会输出第一开关信号S1、第二开关信号S2以及驱动信号Vdrive至开关电路102。每一像素单元120包含液晶电容124(请一并参阅图4)，用来显示影像。数据驱动器106会输出偏压电流使得一行的像素单元120的液晶电容124充电到灰阶电压的电平，以显示不同的灰阶。液晶显示面板110是使用点反转(dot inversion)的驱动方式驱动。也就是说，相邻的两像素单元120是接收相反极性的灰阶电压。开关电路102设置于数据驱动器106与多条数据线D1-Dm之间，其功能是在像素单元120每一次充电之前，控制各个数据线D1-Dm的电性连接关系使得数据线的电压预先向将要写入的灰阶电压的大小转变，以达到省电的目的。
请同时参阅图4和图5，图4是图3的开关电路102、数据驱动器106、液晶显示面板110的电路图，图5是图4所示开关电路102的控制信号的时序图。数据驱动器106包含多个放大器122。开关电路102包含多个电性连接奇数号数据线D2s-1的第一开关T1、多个电性连接偶数号数据线D2s的第二开关T2、多个设置于两相邻的数据线D2s、D2s-1之间的第三开关T3、多个设置在放大器122与对应数据线D1-Dm之间的第四开关T4、一第一电荷分享电容C1以及一第二电荷分享电容C2。第一开关T1和第二开关T2均为双向开关。第三开关T3为单向开关。第一开关T1和第二开关T2受控于第一开关信号S1，第三开关T3受控于第二开关信号S2，第四开关T4受控于驱动信号Vdrive。由于液晶显示器100是采用点反转的驱动方式，所以奇数号数据线D2s-1和偶数号数据线D2s传送的灰阶电压的极性是相反的。以图5为例，在充电期间t0-t1时，奇数号数据线D2s-1传送负极性的灰阶电压，则偶数号数据线D2s传送正极性的灰阶电压。在下一充电期间t5-t6时，奇数号数据线D2s-1传送正极性的灰阶电压，而偶数号数据线D2s传送负极性的灰阶电压。
在每两个充电期间之间，会有一段预充电期间(即t2-t5期间)，开关电路102会调整奇、偶数据线D2s-1、D2s的电平，以节省功率消耗，请参阅以下说明。在期间t1-t5，控制第四开关T4的驱动信号Vdrive是处于低电平，第四开关T4断开，故数据驱动器106不写入灰阶电压至数据线D1-Dm。在期间t1-t2，第四开关T4断开，第一开关T1、第二开关T2和第三开关T3也都断开，故此期间数据驱动器106不写入灰阶电压至数据线D1-Dm，同时开关电路102也不工作，数据驱动器106将下一充电期间t5-t6的灰阶电压锁存，以便在下一充电期间t5-t6写入灰阶电压至数据线D1-Dm。
在一第一预定期间t2-t3，第三开关T3接收到处于低电平(例如接地电位)的第二开关信号S2，第一开关T1和第二开关T2接收到处于第一电平V1的第一开关信号S1。多个第三开关T3断开。多个第一开关T1导通奇数号数据线D2s-1及第一电荷分享电容C1。同时，多个第二开关T2导通偶数号数据线D2s及第二电荷分享电容C2。较佳地，第一分享电容C1和第二分享电容C2的电容值会远大于数据线D2s、D2s-1的负载电容以及像素单元120的液晶电容124，所以奇数号数据线D2s-1上的电荷会传递到第一分享电容C1，而偶数号数据线D2s上的电荷会传递到第二分享电容C2。因为在充电期间t0-t1，奇数号数据线D2s-1是传送负极性的灰阶电压，故电荷分享后的第一分享电容C1的电位低于公共电压；相对地，偶数号数据线D2s是传送正极性的灰阶电压，故电荷分享后的第二分享电容C2的电位高于公共电压。
在一第二预定期间t3-t4，第三开关T3接收到处于高电平的第二开关信号S2，第一开关T1和第二开关T2接收到处于第二电平(例如接地电位)的第一开关信号S1。多个第一开关T1和多个第二开关T2断开，多个第三开关T3导通所有数据线，使得奇数号数据线D2s-1和偶数号数据线D2s因电连接而处于同一电平。
在一第三预定期间t4-t5，第三开关T3接收到处于低电平的第二开关信号S2，第一开关T1和第二开关T2接收到处于第三电平V2的第一开关信号S1。多个第三开关T3断开。多个第一开关T1导通奇数号数据线D2s-1及第二电荷分享电容C2。同时，多个第二开关T2导通偶数号数据线D2s及第一电荷分享电容C1。由于在期间t2-t3第一分享电容C1的电位低于公共电压，第二分享电容C2的电位高于公共电压，因此在下一充电期间(也就是第四预定期间)t5-t6之前，奇数号数据线D2s-1的电平会被第二电荷分享电容C2拉高而略高于公共电压，而偶数号数据线D2s的电平会被第一电荷分享电容C1拉低而略低于公共电压。
前面已经提到，在充电期间t5-t6时，奇数号数据线D2s-1需要传送正极性的灰阶电压，而偶数号数据线D2s需要传送负极性的灰阶电压。而此前奇数号数据线D2s-1的电平已经略高于公共电压，且偶数号数据线D2s的电平已略低于公共电压，因此数据驱动器106只需要较小的偏压电流就可以让奇数号数据线D2s-1或是偶数号数据线D2s上的像素单元120充电到所要的电平，因此相较于先前技术，本发明液晶显示器可以减少功率消耗。
本发明液晶显示器并不限于以上实施方式所述，例如：开关电路102也可以集成在数据驱动器106中，其运作原理相同。
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。
 本发明的实施方式
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Claims (15)

  1. 一种液晶显示器，其包括多条数据线、一数据驱动器和多个像素单元，每一数据线连接一像素单元，所述数据驱动器包括多个放大器，所述数据驱动器用来以点反转驱动方式在相邻数据线上写入灰阶电压，其特征在于：所述液晶显示器进一步包括一连接于数据驱动器与多条数据线之间的开关电路，上述开关电路包括：
    一第一电荷分享电容和一第二电荷分享电容；
    多个第一开关，电性连接奇数号数据线，用来在一第一预定期间导通所述奇数号数据线及所述第一电荷分享电容，在一第二预定期间断开，并在一第三预定期间导通所述奇数号数据线及所述第二电荷分享电容；
    多个第二开关，电性连接偶数号数据线，用来在所述第一预定期间导通所述偶数号数据线及所述第二电荷分享电容，在所述第二预定期间断开，并在所述第三预定期间导通所述偶数号数据线及所述第一电荷分享电容；
    多个第三开关，每一第三开关设置于两相邻的数据线之间，用来在所述第二预定期间导通所述偶数号数据线和奇数号数据线；以及
    多个第四开关，上述数据驱动器包括多个放大器，每一第四开关连接在每一放大器与对应数据线之间，用来在一充电期间导通所述放大器与所述多个像素单元。
  2. 根据权利要求1所述的液晶显示器，其特征在于：上述液晶显示器进一步包括一时序控制器，上述时序控制器用来产生一第一开关信号和一第二开关信号，上述第一开关信号用于控制上述第一开关和第二开关的通断，上述第二开关信号用于控制上述第三开关的通断。
  3. 根据权利要求1所述的液晶显示器，其特征在于：上述数据驱动器用于在充电期间写入灰阶电压至数据线，上述三个预定期间设于相邻两个充电期间之间。
  4. 根据权利要求1所述的液晶显示器，其特征在于：所述时序控制器进一步产生一用于控制上述第四开关通断的驱动信号。
  5. 根据权利要求1所述的液晶显示器，其特征在于：所述第一开关和第二开关均为双向开关，所述第三开关和所述第四开关为单向开关。
  6. 一种液晶显示器，其包括多条数据线、一数据驱动器和多个像素单元，每一数据线连接一像素单元，所述数据驱动器用来以点反转驱动方式在相邻数据线上写入灰阶电压，其特征在于：所述液晶显示器进一步包括一连接于数据驱动器与多条数据线之间的开关电路，上述开关电路包括：
    一第一电荷分享电容和一第二电荷分享电容；
    多个第一开关，电性连接奇数号数据线，用来在一第一预定期间导通所述奇数号数据线及所述第一电荷分享电容，在一第二预定期间断开，并在一第三预定期间导通所述奇数号数据线及所述第二电荷分享电容；
    多个第二开关，电性连接偶数号数据线，用来在所述第一预定期间导通所述偶数号数据线及所述第二电荷分享电容，在所述第二预定期间断开，并在所述第三预定期间导通所述偶数号数据线及所述第一电荷分享电容；以及
    多个第三开关，每一第三开关设置于两相邻的数据线之间，用来在所述第二预定期间导通所述偶数号数据线和奇数号数据线。
  7. 根据权利要求6所述的液晶显示器，其特征在于：上述液晶显示器进一步包括一时序控制器，上述时序控制器用来产生一第一开关信号和一第二开关信号，上述第一开关信号用于控制上述第一开关和第二开关的通断，上述第二开关信号用于控制上述第三开关的通断。
  8. 根据权利要求6所述的液晶显示器，其特征在于：上述数据驱动器用于在一充电期间写入灰阶电压至数据线，上述三个预定期间设于相邻两个充电期间之间。
  9. 根据权利要求6所述的液晶显示器，其特征在于：所述第一开关和第二开关均为双向开关，所述第三开关为单向开关。
  10. 根据权利要求6所述的液晶显示器，其特征在于：所述开关电路集成于所述数据驱动器之内。
  11. 一种液晶显示器驱动方法，所述液晶显示器包括多条数据线、一数据驱动器和多个像素单元，每一数据线连接一像素单元，所述数据驱动器用来以点反转驱动方式在相邻数据线上写入灰阶电压，其特征在于：
    提供一第一电荷分享电容、一第二电荷分享电容、电性连接奇数号数据线的多个第一开关、电性连接偶数号数据线的多个第二开关和设置于两相邻的数据线之间的多个第三开关；
    在所述第一预定期间，控制所述多个第一开关导通所述奇数号数据线及所述第一电荷分享电容，并控制所述多个第二开关导通所述偶数号数据线及所述第二电荷分享电容；
    在所述第二预定期间，控制所述多个第三开关导通所述偶数号数据线和奇数号数据线，控制所述多个第一开关断开所述奇数号数据线及所述第一电荷分享电容，并控制所述多个第二开关断开所述偶数号数据线及所述第二电荷分享电容；及
    在所述第三预定期间，控制所述多个第一开关导通所述奇数号数据线及所述第二电荷分享电容，并控制所述多个第二开关导通所述偶数号数据线及所述第一电荷分享电容。
  12. 根据权利要求11所述的液晶显示器驱动方法，其特征在于：上述三个预定期间发生于相邻两个充电期间之间，所述充电期间是上述数据驱动器将灰阶电压写入至数据线的期间。
  13. 根据权利要求12所述的液晶显示器驱动方法，其特征在于：所述第一开关和第二开关均为双向开关，所述第三开关为单向开关。
  14. 根据权利要求12所述的液晶显示器驱动方法，其特征在于：提供多个第四开关，上述数据驱动器包括多个放大器，每一第四开关连接在每一放大器与对应数据线之间，用来在充电期间导通所述放大器与所述多个像素单元。
  15. 根据权利要求14所述的液晶显示器驱动方法，其特征在于：所述多个第四开关为单向开关。
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