WO2018153290A1 - 一种显示面板的驱动方法及显示面板 - Google Patents

一种显示面板的驱动方法及显示面板 Download PDF

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Publication number
WO2018153290A1
WO2018153290A1 PCT/CN2018/076208 CN2018076208W WO2018153290A1 WO 2018153290 A1 WO2018153290 A1 WO 2018153290A1 CN 2018076208 W CN2018076208 W CN 2018076208W WO 2018153290 A1 WO2018153290 A1 WO 2018153290A1
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Prior art keywords
display panel
demux
switch
switching signal
driving
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PCT/CN2018/076208
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English (en)
French (fr)
Inventor
向东
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昆山国显光电有限公司
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Application filed by 昆山国显光电有限公司 filed Critical 昆山国显光电有限公司
Priority to EP18758323.2A priority Critical patent/EP3537418A4/en
Priority to JP2019530053A priority patent/JP2019537070A/ja
Priority to KR1020197017692A priority patent/KR20190084116A/ko
Priority to US16/318,550 priority patent/US10672335B2/en
Publication of WO2018153290A1 publication Critical patent/WO2018153290A1/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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] 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
    • G09G2230/00—Details of flat display driving waveforms
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0219—Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • 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

Definitions

  • the present invention relates to the field of flat panel display technologies, and in particular, to a display panel driving method and a display panel.
  • AMOLED Active-matrix organic light emitting diode, active matrix organic light emitting diode or active matrix organic light emitting diode
  • AMOLED Active-matrix organic light emitting diode, active matrix organic light emitting diode or active matrix organic light emitting diode
  • the Demux circuit When AMOLED is applied to smart wear, due to the small size of the AMOLED display panel and the need to meet high resolution, the Demux circuit is used in the design.
  • the switch signal in the Demux circuit is transmitted from the two sides of the display panel to the middle position, and the trace of the display panel is narrowed due to factors such as the size of the display, and the width of the trace is narrowed.
  • the uneven brightness of the side position and the middle position is manifested by the presence of a bright line (Mura) in the S direction (ie, the column direction) at the intermediate position, thereby affecting the yield of the product.
  • Mura bright line
  • An object of the present invention is to provide a driving method of a display panel to solve the problem of uneven brightness after driving a display panel having a Demux circuit.
  • the present invention provides a driving method of a display panel, the display panel having a Demux circuit, and the driving method of the display panel includes the following steps:
  • the signal for controlling the on-off state of the switch in the Demux circuit is a switching signal, and each rising time period of the switching signal is split into two stages, and the switch in the Demux circuit is always in the lead during the rising period of the switching signal. Pass state.
  • the two phases include a first phase and a second phase, in which the switching signal changes from a low level to a predetermined level
  • the predetermined level is a level between a low level and a high level, and when the switching signal is at the predetermined level, the switch is still in an on state.
  • the switching signal changes from a predetermined level to a high level.
  • the switch when the switch signal is at a low level, the switch is in an on state.
  • the switch signal when the switch signal is at a high level, the switch is in a closed state.
  • the switch is a thin film transistor.
  • the present invention also provides a display panel, the display panel comprising: a driving module, a Demux module connected to the driving module, and a pixel module connected to the Demux module;
  • the driving module outputs a switching signal for controlling an open/close state of a switch in the Demux module to the Demux module, and each rising time period of the switching signal is split into two stages for rising, in a rising period of the switching signal
  • the switches in the inner Demux module are always on.
  • the Demux module includes a plurality of Demux circuits, each of the Demux circuits includes a switch, a parasitic capacitor, and a coupling capacitor, and the first plate of the parasitic capacitor and the switch Connected, the second plate of the parasitic capacitance is connected to the first plate of the coupling capacitor.
  • the pixel module includes a plurality of pixel circuits, and the number of pixel circuits is the same as the number of the Demux circuits, and each pixel circuit is connected to a Demux circuit, and each pixel circuit is connected thereto.
  • the second plate of the coupling capacitor in the Demux circuit is connected.
  • the signal for controlling the on-off state of the switch in the Demux circuit is a switching signal, and each rising time period of the switching signal is split into two stages. Therefore, the voltage abrupt effect generated by the position of the two sides of the display panel and the intermediate position of the display panel is relatively uniform, thereby ensuring that the charging effects of different positions of the display panel are substantially the same, the brightness of the display panel is uniform after driving, and the appearance of the display panel is effectively improved. The problem of bright lines in the direction.
  • FIG. 1 is a schematic structural view of a display panel having a Demux circuit
  • FIG. 2 is a timing diagram of a switching signal employed in the prior art
  • FIG. 3 is a schematic diagram showing changes of driving signals, switching signals, and voltages written to the pixel circuits at positions on both sides of the display panel in the prior art
  • FIG. 4 is a schematic diagram showing changes of a driving signal, a switching signal, and a voltage written in a pixel circuit in an intermediate position of a display panel in the prior art
  • Figure 5 is a timing diagram of a switching signal employed in an embodiment of the present invention.
  • FIG. 6 is a schematic diagram showing changes of driving signals, switching signals, and voltages written to pixel circuits at positions on both sides of a display panel according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram showing changes in driving signals, switching signals, and voltages written in a pixel circuit at an intermediate position of a display panel according to an embodiment of the present invention
  • FIG. 8 is a schematic structural view of a display panel according to an embodiment of the present invention.
  • FIG. 1 is a structural diagram of a display panel with a Demux circuit.
  • the display panel includes a driving source, a plurality of Demux circuits, and a plurality of pixel circuits.
  • the number of the Demux circuits is the same as the number of the pixel circuits, and the driving source is connected to the plurality of Demux circuits, and each Demux circuit is connected.
  • Each Demux circuit includes a switch (SW1, SW2, SW3, SW4, SW5 or SW6) and a parasitic capacitor C1 and a coupling capacitor C2.
  • the parasitic capacitor C1 is disposed between the switch and the coupling capacitor C2, and the coupling capacitor C2 is disposed at The parasitic capacitance C1 is between the pixel circuit.
  • the driving method of the conventional display panel is driven by the switching signal shown in FIG. 2 by using the timing chart. Since the on-off state of the switch is controlled by the switching signal, when the switching signal is high level When VGH, the switch (such as TFT, thin film transistor) is turned off. On the contrary, when the switch signal is low level VGL, the switch is turned on. When the switch signal passes the low period VGL and becomes high level VGH after the T period, the feedthrough The effect (ie, the sudden change in voltage) causes the voltage at one end of the parasitic capacitance C1 to be raised.
  • the switch such as TFT, thin film transistor
  • the raised voltage is Also known as the feedthrough voltage
  • the amount of charge on the plate of the coupling capacitor C2 is increased, so that the voltage Vdata written on the driving source to the pixel circuit is increased, and the coupling is stored at this time.
  • the voltage on capacitor C2 becomes Vdata + ⁇ V.
  • the reason why the S-direction bright mark appears in the middle position of the display panel with the Demux circuit is that since the switching signal is double-ended driving (that is, driving from both sides of the display panel to the middle), as shown in FIG. 4, due to factors such as impedance, A delay occurs when the switching signal in the middle position of the display panel rises from a low level to a high level, and the feedthrough voltage ⁇ V generated at this time is released by a switch (for example, a TFT), so that the intermediate position is written into the pixel circuit.
  • the voltage Vdata+ ⁇ V2 (shown in FIG. 4) becomes smaller than the voltage Vdata+ ⁇ V1 (shown in FIG.
  • ⁇ V1 and ⁇ V2 refer to the feedthrough voltage at the position on both sides of the screen and the feedthrough voltage at the intermediate position of the screen, respectively, and the value of ⁇ V1 is larger than the value of ⁇ V2.
  • the present application proposes a new driving method of the display panel, which specifically includes the following steps:
  • the signal for controlling the on-off state of the switch in the Demux circuit is a switching signal, and each rising time period of the switching signal is split into two stages, and the switch in the Demux circuit is always in the lead during the rising period of the switching signal. Pass state.
  • the rising period of the switching signal refers to a period of time from the time when the switching signal changes from the high level to the low level to the time when the switching signal changes to the high level again.
  • the two phases include a first phase and a second phase
  • the switching signal changes from a low level to a predetermined level
  • the predetermined level is at a low level and a level between a high level, and when the switching signal is at the predetermined level, the switch is still in an on state
  • the switching signal is changed from a predetermined level High level.
  • the rising period is composed of the first phase T and the second phase T1.
  • the switching signal shown in FIG. 2 is modified to adopt the switch as shown in FIG. The signal is driven.
  • the switching signal changes from the low level VGL predetermined level V x (corresponding to the first stage): the feed-through voltage is generated
  • the switching signal is at said predetermined level 6 V x:
  • the switch is still in the ON state, the period of time T corresponding to electrical VGL
  • the feedthrough voltage generated by the level V x corresponding to the T1 period is ⁇ V a , and ⁇ V a can release a part of the charge through the switch tube.
  • the voltage written in the pixel circuits on both sides of the display panel is Vdata+ ⁇ V1', where ⁇ V1' is slightly smaller than ⁇ V a .
  • the switching signal is at the predetermined level V x:
  • the switch is still in the ON state, the VGL level corresponding to period T becomes the period T1
  • the feedthrough voltage generated by the corresponding level V x of the segment is ⁇ V b , and ⁇ V b can release a part of the charge through the switch tube, and the voltage written in the pixel circuit at the middle position of the display panel at this time is Vdata+ ⁇ V2' Where ⁇ V2' is slightly smaller than ⁇ V b .
  • the present invention further provides a display panel, including a driving module, a Demux module connected to the driving module, and a pixel module connected to the Demux module; the driving module output controls a switch in the Demux module
  • the switching signal of the open and close state is sent to the Demux module, and each rising time period of the switching signal is split into two stages for rising, and the switches in the Demux module are always in the two rising periods of the switching signal. On state.
  • the Demux module includes a plurality of Demux circuits, each of the Demux circuits includes a switch, a parasitic capacitor and a coupling capacitor, and the first plate of the parasitic capacitor is connected to the switch, and the second pole of the parasitic capacitor The board is coupled to the first plate of the coupling capacitor.
  • the pixel module includes a plurality of pixel circuits, the number of pixel circuits is the same as the number of Demux circuits, and each pixel circuit is connected to a Demux circuit, and each pixel circuit is connected to a second plate of a coupling capacitor in a correspondingly connected Demux circuit. .
  • the signal for controlling the on-off state of the switch in the Demux circuit is a switching signal, and each rising time period of the switching signal is split. Two stages, so that the voltage abrupt effect generated by the position of the two sides of the display panel and the middle position of the display panel is relatively uniform, thereby ensuring that the charging effects of different positions of the display panel are substantially the same, the brightness of the display panel is uniform after driving, and the display panel is effectively improved.
  • the problem of appearing column direction highlights.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

一种显示面板的驱动方法，控制Demux电路中开关的通闭状态的信号为开关信号，通过将开关信号中每个上升时间段均拆分为两个阶段（T，T1），从而使得显示面板的两侧位置和显示面板的中间位置产生的电压突变效应相对均匀，从而确保显示面板不同位置的充电效果大致相同，显示面板驱动后亮度均匀，有效改善了显示面板的出现列方向亮纹的问题。

Description

一种显示面板的驱动方法及显示面板 技术领域
本发明涉及平板显示技术领域，特别涉及一种显示面板的驱动方法及显示面板。
背景技术
针对较小尺寸的显示面板，例如AMOLED(Active-matrix organic light emitting diode，有源矩阵有机发光二极体或主动矩阵有机发光二极体)具有视角广，对比度高，低功耗，轻薄等优点。目前已被AMOLED广泛应用于智能手机或智能穿戴等领域。
在AMOLED运用到智能穿戴上时，由于AMOLED自身显示面板的尺寸较小且需满足高分辨率，因此在设计上会运用到Demux电路。通常Demux电路中的开关信号从显示面板的两侧位置向中间位置传输，而显示面板的走线会因外形尺寸等因素限制导致走线宽度会变窄，走线宽度变窄后显示面板呈现两侧位置和中间位置亮度不均匀的现象，表现为中间位置出现S向(即列方向)的亮纹(Mura)，从而影响产品的良率。
针对具有Demux电路的显示面板驱动后存在亮度不均匀的问题，本领域技术人员一直在寻找解决该问题的解决方法。
发明内容
本发明的目的在于提供一种显示面板的驱动方法，以解决具有Demux电路的显示面板驱动后存在亮度不均匀的问题。
为解决上述技术问题，本发明提供一种显示面板的驱动方法，所述显示面板具有Demux电路，所述显示面板的驱动方法包括步骤如下：
控制Demux电路中开关的通闭状态的信号为开关信号，将所述开关信号中每个上升时间段均拆分为两个阶段，在开关信号的上升时间段内Demux电路中的开关始终处于导通状态。
可选的，在所述的显示面板的驱动方法中，所述两个阶段包括第一阶段和第二阶段，在所述第一阶段中，所述开关信号由低电平变为预定电平，所述预定电平为处于低电平和高电平之间的电平，且所述开关信号处于所述预定电平时，所述开关仍处于导通状态。
可选的，在所述的显示面板的驱动方法中，在所述第二阶段中，所述开关信号由预定电平变为高电平。
可选的，在所述的显示面板的驱动方法中，所述开关信号为低电平时，所述开关处于导通状态。
可选的，在所述的显示面板的驱动方法中，所述开关信号为高电平时，所述开关处于关闭状态。
可选的，在所述的显示面板的驱动方法中，所述开关为薄膜晶体管。
本发明还提供一种显示面板，所述显示面板包括：驱动模块、与所述驱动模块连接的Demux模块及与Demux模块连接的像素模块；
所述驱动模块输出控制Demux模块中开关的通闭状态的开关信号给所述Demux模块，所述开关信号的每个上升时间段均拆分为两个阶段进行上升，在开关信号的上升时间段内Demux模块中的开关始终处于导通状态。
可选的，在所述的显示面板中，所述Demux模块包括若干Demux电路，每个Demux电路包括一开关、一寄生电容及一耦合电容，所述寄生电容的第一极板与所述开关连接，所述寄生电容的第二极板与所述耦合电容的第一极板连接。
可选的，在所述的显示面板中，所述像素模块包括若干像素电路，像素 电路的数量与Demux电路的数量相同，每个像素电路对应连接一Demux电路，每个像素电路与其对应连接的Demux电路中的耦合电容的第二极板连接。
在本发明所提供的显示面板的驱动方法及显示面板中，控制Demux电路中开关的通闭状态的信号为开关信号，通过将所述开关信号中每个上升时间段均拆分为两个阶段，从而使得显示面板的两侧位置和显示面板的中间位置产生的电压突变效应相对均匀，从而确保显示面板不同位置的充电效果大致相同，显示面板驱动后亮度均匀，有效改善了显示面板的出现列方向亮纹的问题。
附图说明
图1是具有Demux电路的显示面板的结构示意图；
图2是现有技术中采用的开关信号的时序图；
图3是现有技术中显示面板的两侧位置的驱动信号、开关信号及写入像素电路的电压的变化示意图；
图4是现有技术中显示面板的中间位置的驱动信号、开关信号及写入像素电路的电压的变化示意图；
图5是本发明一实施例中采用的开关信号的时序图；
图6是本发明一实施例中显示面板的两侧位置的驱动信号、开关信号及写入像素电路的电压的变化示意图；
图7是本发明一实施例中显示面板的中间位置的驱动信号、开关信号及写入像素电路的电压的变化示意图；
图8是本发明一实施例中显示面板的结构示意图。
具体实施方式
以下结合附图和具体实施例对本发明提出的显示面板的驱动方法作进一 步详细说明。根据下面说明和权利要求书，本发明的优点和特征将更清楚。需说明的是，附图均采用非常简化的形式且均使用非精准的比例，仅用以方便、明晰地辅助说明本发明实施例的目的。
请参考图1，其为具有Demux电路的显示面板的结构示意图。如图1所示，所述显示面板包括驱动源、若干Demux电路及若干像素电路，Demux电路的数量与像素电路的数量相同，所述驱动源与所述若干Demux电路均连接，每个Demux电路对应连接一个像素电路。其中，每个Demux电路均包括一个开关(SW1、SW2、SW3、SW4、SW5或SW6)及寄生电容C1和耦合电容C2，寄生电容C1设置于开关与耦合电容C2之间，耦合电容C2设置于寄生电容C1与像素电路之间。
结合图1及图2所示内容，现有显示面板的驱动方法采用时序图为图2所示的开关信号进行驱动，由于开关的通闭状态由开关信号来控制，当开关信号为高电平VGH时开关(例如TFT，薄膜晶体管)关闭，相反当开关信号为低电平VGL时开关导通，当开关信号经过T时间段后由低电平VGL变为高电平VGH时，由于馈通效应(即电压突变)使得寄生电容C1的一端的电压会被抬高，根据公式Q＝CU可知，抬高的电压为
Figure PCTCN2018076208-appb-000001
也称为馈通电压，在寄生电容C1的耦合作用下，会造成耦合电容C2极板上的电荷量增多，使得驱动源上写入到像素电路中的电压Vdata增大，此时存储到耦合电容C2上的电压变成Vdata+ΔV。
具有Demux电路的显示面板的中间位置出现S向亮纹的原因在于：由于开关信号为双端驱动(即由显示面板两边向中间进行驱动)，如图4所示，受阻抗等因素的影响，显示面板的中间位置的开关信号由低电平到高电平上升时出现延迟，此时产生的馈通电压ΔV会通过开关(例如TFT)释放掉一部分，因此中间位置写入到像素电路中的电压Vdata+△V2(如图4所示)相比周围 两边位置(即位于中间位置的两侧位置)写入到像素电路中的电压Vdata+△V1(如图3所示)来说变小，即△V2小于△V1，因此在显示面板的中间位置会出现S向亮纹。这里△V1和△V2分别指代屏幕两侧位置的馈通电压和屏幕中间位置的馈通电压，△V1的数值大于△V2的数值。
基于上述对具有Demux电路显示面板的中间位置会出现S向亮纹的研究结果，请参考图5，本申请提出一种新的显示面板的驱动方法，具体包括如下步骤：
控制Demux电路中开关的通闭状态的信号为开关信号，将所述开关信号中每个上升时间段均拆分为两个阶段，在开关信号的上升时间段内Demux电路中的开关始终处于导通状态。此处，开关信号的上升时间段是指从开关信号从高电平变为低电平的时刻至开关信号再次变为高电平的时刻之间的时间段。其中，所述两个阶段包括第一阶段和第二阶段，在所述第一阶段T结束时，所述开关信号由低电平变为预定电平，所述预定电平为处于低电平和高电平之间的电平，且所述开关信号处于所述预定电平时，所述开关仍处于导通状态；在所述第二阶段T1结束时，所述开关信号由预定电平变为高电平。由第一阶段T和第二阶段T1共同组成所述上升时间段。
主要通过改变开关信号的时序的方式解决具有Demux电路显示面板的中间位置会出现S向亮纹的问题，具体的，将采用如图2所示的开关信号修改为采用如图5所示的开关信号进行驱动工作。
请参考图6及图7，具体过程如下：
在第一时间段T结束时，开关信号由低电平VGL变为预定电平V x(对应第一阶段)：产生馈通电压
Figure PCTCN2018076208-appb-000002
具体的，如图6所示，在屏体两侧位置且在T1时间段内，开关信号处于所述预定电平V x：此时开关仍处于导通状态，将T时间段对应的VGL电平 变为T1时间段所对应电平V x所产生的馈通电压为△V a，△V a可通过开关管释放掉一部分电荷，此时写入到显示面板两侧像素电路中的电压为Vdata+△V1’，其中△V1’略小于△V a。
如图7所示，在屏体中间位置且在T1时间段，开关信号处于所述预定电平V x：此时开关仍处于导通状态，将T时间段对应的VGL电平变为T1时间段所对应电平V x所产生的馈通电压为△V b，△V b可通过开关管释放掉一部分电荷,此时写入到显示面板中间位置的像素电路中的电压为Vdata+△V2’，其中△V2’略小于△V b。
基于上述分析可知，虽然屏体中间位置的馈通电压△V b还是会小于屏幕两侧位置的馈通电压△V a，但由于(V x-VGL)小于(VGH-VGL)，因而显示面板的两侧位置与中间位置的馈通效应相对较均匀，即ΔV a与ΔV b数值相差不大，因此中间位置写入到像素电路中的电压Vdata+ΔV2’(如图7所示)与周围两边位置(即位于中间位置的两侧位置)写入到像素电路中的电压Vdata+ΔV1’几乎相等，故显示面板的中间位置不存在S向亮纹。
请参考图8，本发明还提供一种显示面板，所述显示面板包括驱动模块、与所述驱动模块连接的Demux模块及与Demux模块连接的像素模块；所述驱动模块输出控制Demux模块中开关的通闭状态的开关信号给所述Demux模块，所述开关信号的每个上升时间段均拆分为两个阶段进行上升，在开关信号的两个上升时间段内Demux模块中的开关始终处于导通状态。
其中，所述Demux模块包括若干Demux电路，每个Demux电路包括一开关、一寄生电容及一耦合电容，所述寄生电容的第一极板与所述开关连接，所述寄生电容的第二极板与所述耦合电容的第一极板连接。
所述像素模块包括若干像素电路，像素电路的数量与Demux电路的数量相同，每个像素电路对应连接一Demux电路，每个像素电路与其对应连接的 Demux电路中的耦合电容的第二极板连接。
综上，在本发明所提供的显示面板的驱动方法及显示面板中，控制Demux电路中开关的通闭状态的信号为开关信号，通过将所述开关信号中每个上升时间段均拆分为两个阶段，从而使得显示面板的两侧位置和显示面板的中间位置产生的电压突变效应相对均匀，从而确保显示面板不同位置的充电效果大致相同，显示面板驱动后亮度均匀，有效改善了显示面板的出现列方向亮纹的问题。
上述描述仅是对本发明较佳实施例的描述，并非对本发明范围的任何限定，本发明领域的普通技术人员根据上述揭示内容做的任何变更、修饰，均属于权利要求书的保护范围。

Claims (9)

  1. 一种显示面板的驱动方法，所述显示面板具有Demux电路，其特征在于，包括步骤如下：
    控制Demux电路中开关的通闭状态的信号为开关信号，将所述开关信号中每个上升时间段均拆分为两个阶段，在开关信号的上升时间段内Demux电路中的开关始终处于导通状态。
  2. 如权利要求1所述的显示面板的驱动方法，其特征在于，所述两个阶段包括第一阶段和第二阶段，在所述第一阶段中，所述开关信号由低电平变为预定电平，所述预定电平为处于低电平和高电平之间的电平，且所述开关信号处于所述预定电平时，所述开关仍处于导通状态。
  3. 如权利要求2所述的显示面板的驱动方法，其特征在于，在所述第二阶段中，所述开关信号由预定电平变为高电平。
  4. 如权利要求1所述的显示面板的驱动方法，其特征在于，所述开关信号为低电平时，所述开关处于导通状态。
  5. 如权利要求1所述的显示面板的驱动方法，其特征在于，所述开关信号为高电平时，所述开关处于关闭状态。
  6. 如权利要求1所述的显示面板的驱动方法，其特征在于，所述开关为薄膜晶体管。
  7. 一种显示面板，其特征在于，包括：驱动模块、与所述驱动模块连接的Demux模块及与Demux模块连接的像素模块；
    所述驱动模块输出控制Demux模块中开关的通闭状态的开关信号给所述Demux模块，所述开关信号的每个上升时间段均拆分为两个阶段进行上升，在开关信号的上升时间段内Demux模块中的开关始终处于导通状态。
  8. 如权利要求7所述的显示面板，其特征在于，所述Demux模块包括若干Demux电路，每个Demux电路包括一开关、一寄生电容及一耦合电容，所述寄生电容的第一极板与所述开关连接，所述寄生电容的第二极板与所述耦合电容的第一极板连接。
  9. 如权利要求8所述的显示面板，其特征在于，所述像素模块包括若干像素电路，像素电路的数量与Demux电路的数量相同，每个像素电路对应连接一Demux电路，每个像素电路与其对应连接的Demux电路中的耦合电容的第二极板连接。
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