WO2013143195A1 - 馈通电压补偿电路、液晶显示装置和馈通电压补偿方法 - Google Patents

馈通电压补偿电路、液晶显示装置和馈通电压补偿方法 Download PDF

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Publication number
WO2013143195A1
WO2013143195A1 PCT/CN2012/074583 CN2012074583W WO2013143195A1 WO 2013143195 A1 WO2013143195 A1 WO 2013143195A1 CN 2012074583 W CN2012074583 W CN 2012074583W WO 2013143195 A1 WO2013143195 A1 WO 2013143195A1
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Prior art keywords
thin film
film transistor
liquid crystal
common line
crystal display
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PCT/CN2012/074583
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English (en)
French (fr)
Inventor
林家强
侯鸿龙
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深圳市华星光电技术有限公司
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Priority to US13/510,639 priority Critical patent/US20130257838A1/en
Publication of WO2013143195A1 publication Critical patent/WO2013143195A1/zh

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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control 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
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3648Control of matrices with row and column drivers using an active matrix
    • G09G3/3655Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active 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
    • G09G2300/0876Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0219Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling

Definitions

  • the present invention relates to the field of liquid crystal display, and more particularly to a feedthrough voltage compensation circuit, a liquid crystal display device, and a feedthrough voltage compensation method.
  • TFTs for display control of pixels.
  • the gate of the TFT is connected to the scan line, the source is connected to the data line, the drain is connected to the pixel electrode, and the pixel electrode C (LC) is formed between the pixel electrode and the color filter substrate (CF-Vcom), and the pixel capacitance is connected in parallel.
  • the feedthrough voltage is different.
  • the display has only one Vcom, it has different brightness depending on the position of the display.
  • a common phenomenon is that the display screen is brighter on the left and right sides under a low gray scale picture.
  • Patent Document CN100460939C discloses a liquid crystal display and a pulse wave adjusting circuit thereof on February 11, 2009, the liquid crystal display including a power source, a pulse wave adjusting circuit and a gate driving chip.
  • the pulse wave adjusting circuit is connected between the power source and the gate driving chip, and the power source provides a power signal.
  • the pulse wave adjusting circuit is used for adjusting a plurality of pulse waves of the power signal or selecting an appropriate voltage level, so that the waveform of the pulse wave has a chamfer angle or the amplitude of the pulse wave is increased, thereby reducing the thin film transistor in the driving circuit.
  • the feedthrough voltage affects the display quality of the liquid crystal display panel.
  • Patent Document CN1987620B discloses a liquid crystal display, which has a thin film transistor, a common electrode and a pixel electrode, and the pixel electrode and the common electrode form a liquid crystal capacitor, and the thin film transistor is disclosed in the patent document CN1987620B.
  • the gate includes a gate, a source, and a drain connected to the pixel electrode.
  • the circuit includes a voltage compensation unit including a comparator. When a voltage is applied to the liquid crystal capacitor, the comparator compares the thin film transistor from being turned on to Turn off the source potential of the time period and the film The drain potential after the transistor is turned off and a compensation voltage signal is output to compensate the feedthrough voltage of the thin film transistor.
  • Patent Document CN102023423A discloses a liquid crystal display and a method of manufacturing the same on April 20, 2011.
  • the liquid crystal display comprises a TFT-LCD array substrate and a color filter substrate which are sandwiched together and sandwiched between the liquid crystals.
  • the TFT-disturbed D array substrate includes a gate line for controlling the first data line to supply a data voltage to the pixel electrode.
  • a first thin film transistor and a second thin film transistor for controlling a second data line to supply a common voltage to the storage electrode line
  • the color filter substrate including a common electrode independent of each other, the common electrode being electrically connected to the storage electrode line.
  • a thin film transistor for controlling the common electrode is disposed on the array substrate, so that the voltage difference between the pixel electrode and the common electrode is kept constant, thereby eliminating feedthrough due to each pixel.
  • Different pixels have different gray scale differences due to different effects, which improves display quality.
  • the technical problem to be solved by the present invention is to provide a feedthrough voltage compensating circuit, a liquid crystal display device and a feedthrough voltage compensating method which can compensate for a feedthrough voltage.
  • a feedthrough voltage compensation circuit for a liquid crystal display comprising: a common line connected to a drain of a thin film transistor corresponding to the liquid crystal molecule, and a storage capacitor connected to the common line, wherein the common line is connected A switch, the switch comprising two inputs, one input connected to a high level reference voltage and the other input connected to a low level compensation voltage.
  • the common lines have at least two, each common line is connected to a set of the storage capacitors, and each common line corresponds to one switch. Pixels in different positions have different parameters. Each common line controls a group of display pixels. Different compensation voltages can be set according to the difference of parameters, which improves the control precision and further improves the display quality.
  • the switch comprises a first thin film transistor and a second thin film transistor, a source of the first thin film transistor is connected to the reference voltage, and a source of the second thin film transistor is connected to the The compensation voltage, the drains of the two thin film transistors are commonly connected to the same common line, the gate of the first thin film transistor is connected to the reference voltage, and the gate of the second thin film transistor is connected to the scan of the corresponding liquid crystal display line.
  • the existing liquid crystal display panels use thin film transistors to control the display of pixels. Therefore, thin film transistors are used as the switching switches, and the thin film transistors of the switching switches can be synchronously formed in the process of the thin film transistors, which is advantageous for reducing the manufacturing cost.
  • the first thin film transistor and the second thin film transistor are both N-type MOS transistors.
  • the switch comprises a first thin film transistor and a second thin film transistor, a source of the first thin film transistor is connected to the reference voltage, and a source of the second thin film transistor is connected to the compensation voltage.
  • the drains of the two thin film transistors are commonly connected to the same common line, and the gates of the first thin film transistor and the second thin film transistor are connected to the scan lines of the same corresponding liquid crystal display. This is another specific control method.
  • the first thin film transistor is a P-type MOS transistor
  • the second thin film transistor is an N-type MOS transistor.
  • the common line has at least two, each common line is connected to a set of the storage capacitors, and each common line corresponds to one switch, the switch includes a first thin film transistor and a second thin film transistor, a source of the first thin film transistor is connected to the reference voltage, a gate is connected to the reference voltage; a source of the second thin film transistor is connected to the compensation voltage, and a gate is connected to a scan line of a corresponding liquid crystal display
  • the drains of the two thin film transistors are commonly connected to the same common line, and the first thin film transistor and the second thin film transistor are both N-type MOS transistors.
  • the common line has at least two, each common line is connected to a set of the storage capacitors, and each common line corresponds to one switch, the switch includes a first thin film transistor and a second thin film transistor, a source of the first thin film transistor is connected to the reference voltage; a source of the second thin film transistor is connected to the compensation voltage, and gates of the first thin film transistor and the second thin film transistor are connected to a same one
  • the scan lines of the liquid crystal display are connected in common to the same common line, the first thin film transistor is a P-type MOS transistor, and the second thin film transistor is an N-type MOS transistor.
  • a liquid crystal display device comprising the feedthrough voltage compensation circuit of the above liquid crystal display.
  • a feedthrough voltage compensation method for a liquid crystal display comprising the steps of: switching a corresponding common line to a low level compensation voltage by a switch when the current scan line is driven; and switching the common line when the scan line drives the pin The reference voltage to a high level.
  • the selection circuit cuts the common line to a low level signal of the compensation voltage when the TFT gate voltage is high level; the TFT gate voltage is a low level, and the common line is The high-level signal of the reference voltage is cut, so that a voltage rise can be given from the common line when the TFT is turned off, thereby increasing the voltage rise across the pixel and improving the display brightness.
  • FIG. 1 is a schematic view showing a driving circuit of a conventional liquid crystal display device
  • FIG. 2 is a schematic view showing distortion of a gate voltage of a conventional liquid crystal display device
  • FIG. 3 is a schematic diagram of the principle of the present invention.
  • Figure 5 is a schematic diagram of the principle of the second embodiment of the present invention.
  • Figure 6 is a schematic view of the driving principle of the present invention.
  • a liquid crystal display device includes the feedthrough voltage compensation circuit of the liquid crystal display, wherein the feedthrough voltage compensation circuit of the liquid crystal display comprises a common line and a storage capacitor, and the storage capacitor is connected to the liquid crystal at one end.
  • a drain of the corresponding thin film transistor the other end of which is connected to the common line
  • the common line is connected with a switch
  • the switch includes two input terminals, one input terminal is connected to a high level reference voltage, and the other end is connected The input is connected to a low-level compensation voltage.
  • the common line may be one, or may be multiple, preferably a plurality of common lines, each common line connecting a set of the storage capacitors, and each common line corresponds to one switch.
  • Such pixels in different positions have different parameters, and each common line controls a group of display pixels, and different compensation powers can be set according to the difference of parameters. Pressure, improve control accuracy, and further improve display quality.
  • the switch includes a first thin film transistor T1 and a second thin film transistor T2, a source and a gate of the first thin film transistor T1 are connected to a reference voltage A-Vcom; and a source of the second thin film transistor T2 Connected to the compensation voltage A-Vcom-low, the gate is connected to the scan line of the corresponding liquid crystal display, and the drains of the two thin film transistors are commonly connected to the same common line Vcom.
  • the first thin film transistor T1 and the second thin film transistor T2 are both N-type MOS transistors.
  • both thin film transistors are P-type MOS transistors, or one is an N-type MOS transistor and the other is a P-type MOS transistor.
  • a thin film transistor is used as a switching switch, and a thin film transistor of a switching switch can be synchronously formed in a thin film transistor process, which is advantageous in reducing manufacturing cost.
  • the switch includes a first thin film transistor T1 and a second thin film transistor T2.
  • the source of the first thin film transistor T1 is connected to the reference voltage A-Vcom, and the source of the second thin film transistor T2.
  • the pole is connected to the compensation voltage A-Vcom-low, and the drains of the two thin film transistors are commonly connected to the same common line Vcom.
  • the gates of the first thin film transistor T1 and the second thin film transistor T2 are connected to scan lines of the same corresponding liquid crystal display. This is another specific control method.
  • the first thin film transistor T1 is a P-type MOS transistor
  • the second thin film transistor T2 is an N-type MOS transistor.
  • both thin film transistors are? A technical scheme of a type 108 transistor or an N-type MOS transistor, or a first thin film transistor T1 is an N-type MOS transistor, and a second thin film transistor T2 is a P-type MOS transistor is also feasible.
  • a thin film transistor is used as a switching switch, and a thin film transistor of a switching switch can be synchronously formed in a thin film transistor process, which is advantageous in reducing manufacturing cost.
  • the feedthrough voltage compensation circuit of the above liquid crystal display changes the common line
  • the voltage is used to compensate for the feedthrough voltage of the corresponding scan line.
  • the driving process includes: when the current scan line is driven, the voltage of the scan line is high, and the corresponding common line is switched to the low level compensation voltage by the switch; when the scan line drive is cancelled The voltage of the scanning line Vgate is low, and the common line is switched to the reference voltage of the high level, and the correction of the feedthrough voltage is achieved by adjusting the common line waveform Vcom.
  • different compensation voltages can be set depending on the RC RC effect at different positions of the scan lines. When the Gate RC is small, the feedthrough voltage is much corrected. Conversely, when the Gate RC is large, the feedthrough voltage correction is small.
  • the voltage (Vpixel) waveforms at both ends of the pixel corresponding to different positions on the same scan line are basically the same.

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  • Engineering & Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
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Abstract

本发明公开一种馈通电压补偿电路、液晶显示装置和馈通电压补偿方法。所述液晶显示器的馈通电压补偿电路包括共通线和存储电容,所述存储电容一端连接至液晶分子对应的薄膜晶体管的漏极,另一端连接到所述共通线,所述共通线连接有切换开关,所述切换开关包括两个输入端,一个输入端连接至高电平的基准电压,另一个输入端连接至低电平的补偿电压。本发明由于采用了切换开关对共通线进行切换,选择电路在TFT闸极电压为高电平时,将共通线切到补偿电压的低电平信号;TFT闸极电压为低电平,将共通线切到基准电压的高电平信号,这样就可以在TFT关闭时从将共通线给予一个压升,来提升像素连接至液晶分子对应的薄膜晶体管的漏极端的电压上升,以补偿馈通电压造成的压降。

Description

馈通电压补偿电路、 液晶显示装置和馈通电压补偿方法
【技术领域】
本发明涉及液晶显示领域, 更具体的说, 涉及一种馈通电压补偿电路、 液 晶显示装置和馈通电压补偿方法。
【背景技术】
现有的液晶显示装置多采用 TFT进行像素的显示控制。
如图 1所示, TFT的闸极连接扫描线, 源极连接数据线, 漏极连接像素电 极, 像素电极与彩膜基板 (CF-Vcom)之间形成像素电容 C(LC)、 像素电容并联有 补偿电容 C(st), 补偿电容 C(st)—端跟 TFT的漏极连接, 另一端连接有共通线 Vcom。由于 TFT的闸极和漏极之间存在寄生电容 Cgs,在 TFT关闭的瞬间 C(gs) 连接闸端的压降造成像素两端的电压随之降低, 产生了馈通电压, 造成显示亮 度下降。 馈通电压不同, 在显示屏只有一个 Vcom 的情况下, 对造成显示屏不 同位置, 有不同的亮度。 如图 2所示, 对于双边驱动的液晶显示装置, 常见的 现象是显示屏在低灰阶画面下, 左右两侧画面较亮。
专利文献 CN100460939C于 2009年 2月 11 日公开了一种液晶显示器及其 脉波调整电路, 该液晶显示器包含电源、 脉波调整电路与栅极驱动芯片。 脉波 调整电路连接于电源与栅极驱动芯片间, 电源提供电源信号。 脉波调整电路用 以调整电源信号的多个脉波或选择适当的电压准位, 使脉波的波形具有一削角 或使脉波的振幅增大, 便能减少驱动电路中的薄膜晶体管受到馈通电压影响, 进而提高液晶显示面板的显示质量。
专利文献 CN1987620B于 2010年 5月 12日公开了一种液晶显示器,其每 一像素单元包括一薄膜晶体管、 一公共电极与一像素电极, 该像素电极与该公 共电极形成一液晶电容, 该薄膜晶体管包括栅极、 源极和连接至该像素电极的 漏极, 上述电路中接入包括一比较器的电压补偿单元, 当加载电压至该液晶电 容时, 该比较器可比较该薄膜晶体管从开启至关闭时间段的源极电位和该薄膜 晶体管关闭后的漏极电位并输出补偿电压信号, 以补偿该薄膜晶体管的馈通电 压。
专利文献 CN102023423A于 2011年 4月 20日公开了一种液晶显示器及其 制造方法。该液晶显示器包括对盒在一起并将液晶夹设其间的 TFT— LCD阵列 基板和彩膜基板, 所述 TFT—扰 D阵列基板包括栅线、 用于控制第一数据线向 像素电极提供数据电压的第一薄膜晶体管和用于控制第二数据线向存储电极线 提供公共电压的第二薄膜晶体管, 所述彩膜基板包括彼此独立的公共电极, 所 述公共电极与存储电极线电连接。 本发明通过在彩膜基板上设置相互独立的公 共电极, 在阵列基板上设置控制公共电极的薄膜晶体管, 使像素电极与公共电 极之间的电压差保持不变, 因此消除了由于各像素馈通效应不同所带来的各像 素显示灰度差异, 提高了显示品质。
【发明内容】
本发明所要解决的技术问题是提供一种可补偿馈通电压的馈通电压补偿电 路、 液晶显示装置和馈通电压补偿方法。
本发明的目的是通过以下技术方案来实现的:
一种液晶显示器的馈通电压补偿电路, 包括共通线和存储电容, 所述存储 电容一端连接至液晶分子对应的薄膜晶体管的漏极, 另一端连接到所述共通线, 所述共通线连接有切换开关, 所述切换开关包括两个输入端, 一个输入端连接 至高电平的基准电压, 另一个输入端连接至低电平的补偿电压。
优选的, 所述共通线至少有两条, 每条共通线连接一组所述存储电容, 每 条共通线对应一个切换开关。 处于不同位置的像素, 其参数有差异, 每条共通 线控制一组显示像素, 可以根据参数的差异设置不同的补偿电压, 提高控制精 度, 进一步改善显示品质。
优选的, 所述切换开关包括第一薄膜晶体管和第二薄膜晶体管, 所述第一 薄膜晶体管的源极连接至所述基准电压, 所述第二薄膜晶体管的源极连接至所 述补偿电压, 两个薄膜晶体管的漏极共同连接到同一共通线,, 所述第一薄膜晶 体管的闸极连接到所述基准电压, 第二薄膜晶体管的闸极连接到对应的液晶显 示器的扫描线。 现有的液晶显示面板大多采用薄膜晶体管来控制像素的显示, 因此采用薄膜晶体管作为切换开关, 在薄膜晶体管制程过程中可同步形成切换 开关的薄膜晶体管, 有利于降低制造成本。
优选的, 所述第一薄膜晶体管和第二薄膜晶体管都为 N型 MOS管。
优选的, 所述切换开关包括第一薄膜晶体管和第二薄膜晶体管, 所述第一 薄膜晶体管的源极连接至所述基准电压, 所述第二薄膜晶体管的源极连接至所 述补偿电压, 两个薄膜晶体管的漏极共同连接到同一共通线, 所述第一薄膜晶 体管和第二薄膜晶体管的闸极连接到同一条对应的液晶显示器的扫描线。 此为 另一种具体的控制方式。
优选的, 所述第一薄膜晶体管为 P型 MOS管, 所述第二薄膜晶体管为 N 型 MOS管。
优选的, 所述共通线至少有两条, 每条共通线连接一组所述存储电容, 每 条共通线对应一个切换开关, 所述切换开关包括第一薄膜晶体管和第二薄膜晶 体管, 所述第一薄膜晶体管的源极连接至所述基准电压, 闸极连接到所述基准 电压; 所述第二薄膜晶体管的源极连接至所述补偿电压, 闸极连接到对应的液 晶显示器的扫描线; 两个薄膜晶体管的漏极共同连接到同一共通线, 所述第一 薄膜晶体管和第二薄膜晶体管都为 N型 MOS管。
优选的, 所述共通线至少有两条, 每条共通线连接一组所述存储电容, 每 条共通线对应一个切换开关, 所述切换开关包括第一薄膜晶体管和第二薄膜晶 体管, 所述第一薄膜晶体管的源极连接至所述基准电压; 所述第二薄膜晶体管 的源极连接至所述补偿电压, 所述第一薄膜晶体管和第二薄膜晶体管的闸极连 接到同一条对应的液晶显示器的扫描线, 漏极共同连接到同一共通线, 所述第 一薄膜晶体管为 P型 MOS管, 所述第二薄膜晶体管为 N型 MOS管。
一种液晶显示装置, 包括上述的一种液晶显示器的馈通电压补偿电路。 一种液晶显示器的馈通电压补偿方法, 包括步骤: 在当前扫描线驱动时, 通过切换开关将对应的共通线切换到低电平的补偿电压; 当扫描线驱动 ^销时, 将共通线切换到高电平的基准电压。
本发明由于采用了切换开关对共通线进行切换, 选择电路在 TFT闸极电压 为高电平时, 将共通线切到补偿电压的低电平信号; TFT闸极电压为低电平, 将 共通线切到基准电压的高电平信号, 这样就可以在 TFT关闭时从将共通线给予 一个压升, 来提升像素两端的电压上升, 提升显示亮度。
【附图说明】
图 1是现有的液晶显示装置驱动电路示意图;
图 2是现有的一种液晶显示装置的闸极电压的畸变示意图;
图 3是本发明的原理示意图;
图 4是本发明实施例一的原理示意图;
图 5是本发明实施例二的原理示意图;
图 6是本发明驱动原理示意图。
【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 3 所示, 一种液晶显示装置, 包括上述的一种液晶显示器的馈通电压 补偿电路, 该液晶显示器的馈通电压补偿电路包括共通线和存储电容, 所述存 储电容一端连接至液晶分子对应的薄膜晶体管的漏极, 另一端连接到所述共通 线, 所述共通线连接有切换开关, 所述切换开关包括两个输入端, 一个输入端 连接至高电平的基准电压, 另一个输入端连接至低电平的补偿电压。 所述共通 线可以是一条, 也可以是多条, 优选多条共通线, 每条共通线连接一组所述存 储电容, 每条共通线对应一个切换开关。 这样处于不同位置的像素, 其参数有 差异, 每条共通线控制一组显示像素, 可以根据参数的差异设置不同的补偿电 压, 提高控制精度, 进一步改善显示品质。
实施例一
如图 4所示, 切换开关包括第一薄膜晶体管 T1和第二薄膜晶体管 T2, 第 一薄膜晶体管 T1的源极和闸极连接至基准电压 A-Vcom; 所述第二薄膜晶体管 T2 的源极连接至所述补偿电压 A-Vcom-low, 闸极连接到对应的液晶显示器的 扫描线, 两个薄膜晶体管的漏极共同连接到同一共通线 Vcom。
优选的, 所述第一薄膜晶体管 T1和第二薄膜晶体管 T2都为 N型 MOS管。 当然两个薄膜晶体管都为 P型 MOS管, 或者一个为 N型 MOS管、 另一个为 P 型 MOS管也是可行的。
现有的液晶显示面板大多采用薄膜晶体管来控制像素的显示, 因此采用薄 膜晶体管作为切换开关, 在薄膜晶体管制程过程中可同步形成切换开关的薄膜 晶体管, 有利于降低制造成本。
实施例二
如图 5所述, 切换开关包括第一薄膜晶体管 T1和第二薄膜晶体管 T2, 所 述第一薄膜晶体管 T1的源极连接至所述基准电压 A-Vcom, 所述第二薄膜晶体 管 T2的源极连接至所述补偿电压 A-Vcom-low, 两个薄膜晶体管的漏极共同连 接到同一共通线 Vcom。所述第一薄膜晶体管 T1和第二薄膜晶体管 T2的闸极连 接到同一条对应的液晶显示器的扫描线。 此为另一种具体的控制方式。
优选的, 所述第一薄膜晶体管 T1为 P型 MOS管, 所述第二薄膜晶体管 T2 为 N型 MOS管。 当然两个薄膜晶体管都为?型^108管或 N型 MOS管、 或者 第一薄膜晶体管 T1为 N型 MOS管,第二薄膜晶体管 T2为 P型 MOS管的技术 方案也是可行的。
现有的液晶显示面板大多采用薄膜晶体管来控制像素的显示, 因此采用薄 膜晶体管作为切换开关, 在薄膜晶体管制程过程中可同步形成切换开关的薄膜 晶体管, 有利于降低制造成本。
如图 6所述, 上述的一种液晶显示器的馈通电压补偿电路通过改变共通线 的电压来补偿对应扫描线的馈通电压。 具体来说, 其驱动过程包括在当前扫描 线驱动时,扫描线的电压 Vgate为高电平,此时通过切换开关将对应的共通线切 换到低电平的补偿电压; 当扫描线驱动撤销时, 扫描线的电压 Vgate为低电平, 将共通线切换到高电平的基准电压, 经由调整共通线波形 Vcom, 达成馈通电压 的修正。如果共通线有多条,可以根据扫描线在不同位置处的 RC阻容效应( Gate RC ) 的不同, 设置不同的补偿电压。 Gate RC较小时, 馈通电压修正的多。 反 之 Gate RC较大时, 馈通电压修正的少。 补偿后, 在同一扫描线不同位置对应 的像素两端的电压 (Vpixel ) 波形基本保持一致。
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。 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、 一种液晶显示器的馈通电压补偿电路, 包括共通线和存储电容, 所述存 储电容一端连接至液晶分子对应的薄膜晶体管的漏极, 另一端连接到所述共通 线, 所述共通线连接有切换开关, 所述切换开关包括两个输入端, 一个输入端 连接至高电平的基准电压, 另一个输入端连接至低电平的补偿电压。
2、 如权利要求 1所述的一种液晶显示器的馈通电压补偿电路, 其中, 所述 共通线至少有两条, 每条共通线连接一组所述存储电容, 每条共通线对应一个 切换开关。
3、 如权利要求 1所述的一种液晶显示器的馈通电压补偿电路, 其中, 所述 切换开关包括第一薄膜晶体管和第二薄膜晶体管, 所述第一薄膜晶体管的源极 连接至所述基准电压, 所述第二薄膜晶体管的源极连接至所述补偿电压, 两个 薄膜晶体管的漏极共同连接到同一共通线, 所述第一薄膜晶体管的闸极连接到 所述基准电压, 第二薄膜晶体管的闸极连接到对应的液晶显示器的扫描线。
4、 如权利要求 3所述的一种液晶显示器的馈通电压补偿电路, 其中, 所述 第一薄膜晶体管和第二薄膜晶体管都为 N型 MOS管。
5、 如权利要求 1所述的一种液晶显示器的馈通电压补偿电路, 其中, 所述 切换开关包括第一薄膜晶体管和第二薄膜晶体管, 所述第一薄膜晶体管的源极 连接至所述基准电压, 所述第二薄膜晶体管的源极连接至所述补偿电压, 两个 薄膜晶体管的漏极共同连接到同一共通线, 所述第一薄膜晶体管和第二薄膜晶 体管的闸极连接到同一条对应的液晶显示器的扫描线。
6、 如权利要求 5所述的一种液晶显示器的馈通电压补偿电路, 其中, 所述 第一薄膜晶体管为 P型 MOS管, 所述第二薄膜晶体管为 N型 MOS管。
7、 如权利要求 1所述的一种液晶显示器的馈通电压补偿电路, 其中, 所述 共通线至少有两条, 每条共通线连接一组所述存储电容, 每条共通线对应一个 切换开关, 所述切换开关包括第一薄膜晶体管和第二薄膜晶体管, 所述第一薄 膜晶体管的源极连接至所述基准电压, 闸极连接到所述基准电压; 所述第二薄 膜晶体管的源极连接至所述补偿电压, 闸极连接到对应的液晶显示器的扫描线; 两个薄膜晶体管的漏极共同连接到同一共通线, 所述第一薄膜晶体管和第二薄 膜晶体管都为 N型 MOS管。
8、 如权利要求 1所述的一种液晶显示器的馈通电压补偿电路, 其中, 所述 共通线至少有两条, 每条共通线连接一组所述存储电容, 每条共通线对应一个 切换开关, 所述切换开关包括第一薄膜晶体管和第二薄膜晶体管, 所述第一薄 膜晶体管的源极连接至所述基准电压; 所述第二薄膜晶体管的源极连接至所述 补偿电压, 所述第一薄膜晶体管和第二薄膜晶体管的闸极连接到同一条对应的 液晶显示器的扫描线, 漏极共同连接到同一共通线, 所述第一薄膜晶体管为 P 型 MOS管, 所述第二薄膜晶体管为 N型 MOS管。
9、 一种液晶显示装置, 包括一种液晶显示器的馈通电压补偿电路, 所述馈 通电压补偿电路包括共通线和存储电容, 所述存储电容一端连接至液晶分子对 应的薄膜晶体管的漏极, 另一端连接到所述共通线, 所述共通线连接有切换开 关, 所述切换开关包括两个输入端, 一个输入端连接至高电平的基准电压, 另 一个输入端连接至低电平的补偿电压。
10、 如权利要求 9所述的一种液晶显示装置, 其中, 所述共通线至少有两 条, 每条共通线连接一组所述存储电容, 每条共通线对应一个切换开关。
11、 如权利要求 9 所述的一种液晶显示装置, 其中, 所述切换开关包括第 一薄膜晶体管和第二薄膜晶体管, 所述第一薄膜晶体管的源极连接至所述基准 电压, 所述第二薄膜晶体管的源极连接至所述补偿电压, 两个薄膜晶体管的漏 极共同连接到同一共通线, 所述第一薄膜晶体管的闸极连接到所述基准电压, 第二薄膜晶体管的闸极连接到对应的液晶显示器的扫描线。
12、 如权利要求 11所述的一种液晶显示装置, 其中, 所述第一薄膜晶体管 和第二薄膜晶体管都为 N型 MOS管。
13、 如权利要求 9所述的一种液晶显示装置, 其中, 所述切换开关包括第 一薄膜晶体管和第二薄膜晶体管, 所述第一薄膜晶体管的源极连接至所述基准 电压, 所述第二薄膜晶体管的源极连接至所述补偿电压, 两个薄膜晶体管的漏 极共同连接到同一共通线, 所述第一薄膜晶体管和第二薄膜晶体管的闸极连接 到同一条对应的液晶显示器的扫描线。
14、 如权利要求 13所述的一种液晶显示装置, 其中, 所述第一薄膜晶体管 为 P型 MOS管, 所述第二薄膜晶体管为 N型 MOS管。
15、 如权利要求 9所述的一种液晶显示装置, 其中, 所述共通线至少有两 条, 每条共通线连接一组所述存储电容, 每条共通线对应一个切换开关, 所述 切换开关包括第一薄膜晶体管和第二薄膜晶体管, 所述第一薄膜晶体管的源极 连接至所述基准电压, 闸极连接到所述基准电压; 所述第二薄膜晶体管的源极 连接至所述补偿电压, 闸极连接到对应的液晶显示器的扫描线; 两个薄膜晶体 管的漏极共同连接到同一共通线,所述第一薄膜晶体管和第二薄膜晶体管都为 N 型 MOS管。
16、 如权利要求 9所述的一种液晶显示装置, 其中, 所述共通线至少有两 条, 每条共通线连接一组所述存储电容, 每条共通线对应一个切换开关, 所述 切换开关包括第一薄膜晶体管和第二薄膜晶体管, 所述第一薄膜晶体管的源极 连接至所述基准电压; 所述第二薄膜晶体管的源极连接至所述补偿电压, 所述 第一薄膜晶体管和第二薄膜晶体管的闸极连接到同一条对应的液晶显示器的扫 描线, 漏极共同连接到同一共通线, 所述第一薄膜晶体管为 P型 MOS管, 所述 第二薄膜晶体管为 N型 MOS管。
17、 一种液晶显示器的馈通电压补偿方法, 包括步骤: 在当前扫描线驱动 时, 通过切换开关将对应的共通线切换到低电平的补偿电压; 当扫描线驱动撤 销时, 将共通线切换到高电平的基准电压。
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