WO2017041348A1 - 源极驱动电路、液晶显示面板及其驱动方法 - Google Patents

源极驱动电路、液晶显示面板及其驱动方法 Download PDF

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WO2017041348A1
WO2017041348A1 PCT/CN2015/092183 CN2015092183W WO2017041348A1 WO 2017041348 A1 WO2017041348 A1 WO 2017041348A1 CN 2015092183 W CN2015092183 W CN 2015092183W WO 2017041348 A1 WO2017041348 A1 WO 2017041348A1
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module
signal
temporary storage
data temporary
source
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PCT/CN2015/092183
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English (en)
French (fr)
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纪飞林
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深圳市华星光电技术有限公司
武汉华星光电技术有限公司
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Priority to US14/897,713 priority Critical patent/US20190012969A1/en
Publication of WO2017041348A1 publication Critical patent/WO2017041348A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—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
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • 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
    • G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
    • 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
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0404—Matrix technologies
    • G09G2300/0408—Integration of the drivers onto the display substrate
    • 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
    • G09G2310/0291—Details of output amplifiers or buffers arranged for use in a driving circuit

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular to a source driving circuit, a liquid crystal display panel, and a driving method thereof.
  • the TX is directly developed to the touch screen.
  • /RX is used to make In-cell screens on both sides or one side of the array substrate and color filter of the liquid crystal display. At present, the thinner In-cell screen has become a future development trend.
  • a touch sensor ie, a TP sensor
  • time-multiplexing with the common electrode is a commonly used method, that is, the touch sensor acts as a common electrode when displaying a normal picture, and as a TX terminal during a touch detection scan or RX end.
  • gesture wake-up is becoming a big selling point for smart phones.
  • Gesture wake-up can be a double-click wake-up, or it can be to wake up the phone through a specific gesture to enter a specific application to start a specific function. Therefore, such a liquid crystal display panel needs to continuously perform a touch detection scan in the standby mode to detect whether the user has a gesture wake-up.
  • the touch sensor is capable of being touched in standby mode. Touch detection, so the touch sensor requires constant square wave or sine wave input.
  • the type and timing of the signals input to the touch sensor differ depending on the different detection scan driving methods. In the standby timing chart shown in FIG. 3, the square wave signal is continuously input to the touch sensor during the touch scanning phase of each frame.
  • the touch sensor acts as a common electrode during the black screen standby phase
  • the charge is coupled to the S pole of the TFT switch (ie, point V A and point V B ) through the storage capacitor.
  • both the square wave signal and the sine wave signal cause a voltage of the same polarity coupled to the S pole of the TFT switch. If the liquid crystal display panel is in the standby mode of the black screen for a long time, the liquid crystal will be in the same polarity for a long time, and the liquid crystal will be polarized, resulting in abnormal display of the screen.
  • an embodiment of the present invention first provides a source driving circuit including a plurality of output channels, each of which includes:
  • a data temporary storage module configured to generate a first driving signal according to the received digital image signal
  • a digital-to-analog conversion module coupled to the data temporary storage module, configured to perform digital-to-analog conversion on the first driving signal to obtain a first analog image signal
  • a buffer amplification module coupled to the digital-to-analog conversion module, for amplifying the first analog image signal to obtain a second analog image signal
  • a clear screen module connected to the buffer amplification module for pulling down a signal output by the buffer amplification module according to a source selection signal to release a charge coupled to the liquid crystal.
  • the clear screen module includes a switch unit, and the first external port and the second external port of the switch unit are respectively connected to an output end of the buffer amplification module and a ground line, and the switch unit The control port is coupled to a signal select line for transmitting the source select signal.
  • control terminals of the switching units in the respective output channels are connected to the same signal selection line.
  • the switching unit includes a field effect transistor, a source and a drain of the field effect transistor respectively forming a first external port and a second external port of the switching unit, and the gate forms the The control port of the switch unit.
  • the data temporary storage module includes a first data temporary storage unit and a second data temporary storage unit, and the second data temporary storage unit is connected to the first data temporary storage unit and the digital model Between conversion modules.
  • the source driving circuit further includes:
  • a source selection signal generating module configured to be connected to the clear screen module, configured to control the clear screen module to generate a signal output by the buffer amplification module by using the generated source selection signal.
  • each output channel further includes:
  • a level conversion module connected between the data temporary storage module and the analog to digital conversion module for level converting the first driving signal.
  • the present invention also provides a method of driving a liquid crystal display panel, the method being driven by the source driving circuit according to any of the above, comprising:
  • the source selection signal is configured to a first level to control the clear screen module to maintain the output of the buffer amplifier circuit in a high impedance state, and at the same time, the GOA circuit is configured to output a low level signal;
  • the source selection signal is configured to a second level to control the clear screen module to pull down a signal output by the buffer amplification module, and at the same time, the GOA circuit is configured to output a scan signal.
  • the first display period includes a touch scan period of n adjacent display frames and an n+1th display frame
  • the second display period includes an n+1th display frame Black screen standby time
  • the present invention also provides a liquid crystal display panel comprising the source driving circuit according to any of the above.
  • the liquid crystal panel provided by the present invention can effectively remove the In-cell by connecting the output end of the source driving circuit to the ground for a certain period of time and simultaneously causing the GOA circuit to output a scanning signal for at least one scanning scanning period.
  • the liquid crystal display panel When the liquid crystal display panel is in the standby mode, it is coupled to the electric charge on the liquid crystal by the touch detection scanning, thereby preventing the liquid crystal from being polarized due to being in the same polarity for a long time.
  • the power consumption of the source driving circuit provided by the present invention is lower than that of the existing source driving circuit.
  • FIG. 1 is a schematic structural view of a conventional liquid crystal display panel
  • 3 is a standby timing chart of a conventional liquid crystal display panel
  • FIG. 4 is a partial circuit diagram of a conventional liquid crystal display panel
  • FIG. 5 is a schematic structural diagram of an output channel in a source driving circuit according to an embodiment of the invention.
  • FIG. 6 is a standby timing chart of a liquid crystal display panel according to an embodiment of the present invention.
  • the present embodiment proposes a novel source driving circuit for the liquid crystal display panel.
  • the source driving circuit includes a plurality of output channels of the same structure, and FIG. 5 shows a schematic structural view of the first output channel 500 in the circuit.
  • the first output channel 500 is connected to the data line S1, and includes a data temporary storage module 501, a level conversion module 502, a digital-to-analog conversion module 503, a buffer amplification module 504, and a clear screen module 505.
  • the data temporary storage module 501 is capable of storing data for outputting to sub-pixels corresponding to the scan lines.
  • the data temporary storage module 501 preferably includes two data temporary storage units, that is, a first data temporary storage unit and a second data temporary storage unit.
  • the second data temporary storage unit is connected between the first data temporary storage unit and the level conversion module 502. In this way, when the data stored by the second data temporary storage unit starts to charge the sub-pixels on the n-1th scan line, the data corresponding to the sub-pixels on the n-th scan line can be started to be stored first. In the data temporary storage unit.
  • the data dump module only includes one data temporary storage unit (for example, the first data temporary storage unit), then the data temporary storage unit can only start after the sub-pixels on the scan line of the n-1th line are charged. The data corresponding to the sub-pixels on the scan line of the nth line is stored.
  • the prior art source driving circuit using a data temporary storage unit structure is obviously more time consuming.
  • the total number required in the source driver circuit is different. For example, for a 6-bit Full HD liquid crystal display, a total of 69,120 data temporary storage units are required in the source driving circuit.
  • the highest level of the first driving signal output by the data temporary storage module 501 is usually 3.3V, so it is necessary to utilize the level shifting.
  • the module 502 is modified to level convert the first drive signal to obtain a higher level signal (ie, the second drive signal).
  • the source driving circuit may not be configured with electricity.
  • the flat conversion module 502 the present invention is not limited thereto.
  • the digital-to-analog conversion module 503 is connected to the level conversion module 502 for performing analog-to-digital conversion on the second driving signal output by the level conversion module 502 to obtain a corresponding first analog image signal.
  • the digital-to-analog conversion module 503 obtains voltages for driving the liquid crystal display different gray levels according to different second driving signals.
  • the ratio of the resistor determines the level of the first analog image signal. Under this configuration, when the external temperature or the chip process changes, the level of the first analog image signal output by the digital-to-analog conversion module 503 will not change.
  • the absolute value of the voltage divider resistor affects power consumption and drive capability.
  • the buffer amplifying module 504 is preferably implemented by a follower circuit composed of an operational amplifier.
  • the buffer amplifying module 504 can also be implemented by other reasonable components and circuit forms, and the present invention is not limited thereto.
  • the clear screen module 505 is connected to the buffer amplifying module 504.
  • the clearing module 505 includes a switching unit T1, wherein the first external port and the second external port of the switching unit T1 are respectively connected to the output end of the buffer amplifying module 504 and the ground, and the switching unit T1
  • the control port is connected to a signal selection line for transmitting the source selection signal Sel.
  • the clear screen module 505 can pull down the signal output by the buffer amplification module 504 under the control of the source selection signal, thereby releasing the capacitance coupled to the liquid crystal.
  • the switching unit T1 is implemented by using a field effect transistor.
  • the source and the drain of the FET form a first external port and a second external port of the switching unit T1, respectively, and the gate forms a control port of the switching unit T1.
  • the switch unit T1 may also be implemented by other reasonable components or circuit forms, and the present invention is not limited thereto.
  • the source selection signal used to control the clearing module 505 is generated by the source selection signal generating module. produced. It should be noted that in various embodiments of the present invention, the source selection signal generating module may be integrated in the source driving circuit or may be operated by other circuits in the liquid crystal display panel, and the present invention is not limited thereto.
  • the source selection signal generating module When the liquid crystal display panel is in the standby mode, the source selection signal generating module generates a source selection signal of the first level in the first display period, and at the same time, the output state of the buffer amplifier circuit 504 is a high impedance state. At this time, the signal output from the GOA circuit for generating the scan signal is a low level signal.
  • the source selection signal generating module In the second display period, the source selection signal generating module generates a second level of the source selection signal, thereby controlling the clearing module 505 to pull the output signal of the buffer amplification module 504 low. At this time, the GOA circuit outputs a scan signal to the scan line line by line. In this way, the charge coupled to the liquid crystal is released, thereby preventing the liquid crystal from being polarized.
  • Fig. 6 is a view showing a standby timing chart of the liquid crystal display panel in the embodiment.
  • the black screen standby signal output by the AP board is at a low level.
  • the GOA circuit continues to output a low level signal.
  • the touch scan signal is continuously input to the touch detector to detect whether the liquid crystal display panel is touched; and in the black screen standby standby phase of each frame, the common electrode signal is continuously input to the touch detector.
  • the touch detector is made to act as a common electrode. This also achieves time-sharing multiplexing of touch detectors.
  • the source driver circuit does not perform signal output and remains in a high impedance state.
  • the black screen standby signal output by the AP board is low.
  • the touch scan signal is continuously input to the touch detector to detect whether the liquid crystal display panel is touched.
  • the source driver circuit still does not perform signal output and remains in a high impedance state.
  • the GOA circuit outputs a scan signal to the scan line line by line, and at the same time, the source select signal generation module generates a high level source select signal.
  • the clear-screen module 505 After receiving the high-level source selection signal, the clear-screen module 505 connects the output end of the buffer amplification module 504 to the ground, thereby pulling the signal output by the buffer amplification module 504 low.
  • the black screen standby phase of the n+1th frame may also be a clear screen phase.
  • each clear screen module in each output channel is connected to the same selection signal line Sel
  • the buffer amplification module 504 of each output channel is in the black screen standby phase of the n+1th frame.
  • the outputs are connected to the ground. Since the TFT switches connected to the respective scanning lines are successively turned on at this time, the V A point and the V B point in FIG. 3 are connected to the ground line, so that the V A point and the V B point are coupled by the touch detection scanning. The resulting charge is released, thereby preventing the liquid crystal from being polarized due to being in the same polarity for a long time.
  • the working state of each module in the liquid crystal display panel is the same as that of the first frame to the nth frame, and details are not described herein again.
  • n can be set to different reasonable values through the AP board in consideration of the standby power consumption and the actual debugging of the planned risk, and the present invention is not limited thereto.
  • the liquid crystal panel provided by the embodiment connects the output end of the source driving circuit to the ground for a certain period of time, and at the same time causes the GOA circuit to output the scanning signal for at least one scanning scanning period.
  • the charge coupled to the liquid crystal by the touch detection scan when the In-cell liquid crystal display panel is in the standby mode can be effectively removed, thereby preventing the liquid crystal from being polarized due to being in the same polarity for a long time.
  • the power consumption of the source driving circuit provided by this embodiment is lower than that of the existing source driving circuit.

Abstract

一种源极驱动电路、液晶显示面板及其驱动方法，该源极驱动电路包括多个输出通道，每个输出通道（500）包括：数据暂存模块（501），其用于根据接收到的数字影像信号生成第一驱动信号；数模转换模块（503），其与数据暂存模块（501）连接，用于对第一驱动信号进行数模转换，得到第一模拟影像信号；缓冲放大模块（504），其与数模转换模块（503）连接，用于对第一模拟影像信号进行放大，得到第二模拟影像信号；清屏模块（505），其与缓冲放大模块（504）连接，用于根据源极选择信号将缓冲放大模块（504）输出的信号拉低，以释放耦合到液晶上的电荷。该源极驱动电路能够有效清除In-cell液晶显示面板在处于待机模式下时因触摸侦测扫描而耦合到液晶上的电荷，从而避免了液晶因长时间处于同一极性而被极化。

Description

源极驱动电路、液晶显示面板及其驱动方法
相关技术的交叉引用
本申请要求享有2015年09月08日提交的名称为：“源极驱动电路、液晶显示面板及其驱动方法”的中国专利申请CN201510566431.9的优先权，其全部内容通过引用并入本文中。
技术领域
本发明涉及液晶显示技术领域，具体地说，涉及源极驱动电路、液晶显示面板及其驱动方法。
背景技术
随着液晶显示技术的不断发展，中小尺寸的手机面板轻薄化、智能化成为了未来的发展趋势。为了满足广大消费人群的需求，或者吸引消费者的兴趣，手机厂商也在不断推出新的功能，其中触摸功能伴随着智能手机的发展也得到了长足发展。
从触摸屏与液晶显示屏的结构关系来看，从最初的分离的OGS屏，发展到将触摸屏形成在液晶显示屏的彩色滤光板之上的On-cell屏，再发展到如今直接将触摸屏的TX/RX做在液晶显示屏的阵列基板和彩色滤光板两侧或其中一侧的In-cell屏，目前厚度较薄的In-cell屏成为了未来的发展趋势。
然而，如图1所示，对于Full In-cell架构的液晶显示器来说，一般会将触摸传感器(即TP sensor)形成在阵列基板侧。对于这种液晶显示器来说，如图2所示，与公共电极分时复用是目前常用的做法，即触摸传感器在正常显示画面时作为公共电极，而在触摸侦测扫描时作为TX端或RX端。
随着手机智能化的发展，人们对触摸技术的应用要求也越来越高，手机厂商也因此推出了很多新的触摸功能，其中手势唤醒正成为智能手机的一大卖点。手势唤醒可以是双击唤醒，也可以是通过一个特定手势唤醒手机使其进入特定的应用软件从而启动特定的功能等。因此这类液晶显示面板就需要在待机模式下不断进行触摸侦测扫描，以侦测用户是否有进行手势唤醒。
对于Full In-cell液晶显示面板来说，触摸传感器在待机模式下由于需要能够进行触 摸侦测，因此触摸传感器就需要不断有方波或弦波输入。输入到触摸传感器的信号的类型以及时序会视不同侦测扫描驱动方法而不同，在如图3所示的待机时序图中，在每一帧的触摸扫描阶段持续向触摸传感器输入方波信号。
如图4所示，由于触摸传感器在黑屏待机阶段是作为公共电极的，因此电荷会通过储能电容耦合到TFT开关的S极(即VA点和VB点)。这样，无论是方波信号还是弦波信号，都会造成耦合到TFT开关的S极的为同一极性的电压。而如果液晶显示面板长时间处于黑屏的待机模式下，则会造成液晶长时间处于同一极性进而致使液晶被极化，造成画面显示异常。
发明内容
本发明所要解决的技术问题是为了避免Full In-cell液晶显示面板在处于待机模式时液晶因长时间处于同一极性而被极化的问题。为解决上述问题，本发明的一个实施例首先提供了一种源极驱动电路，其包括多个输出通道，每个输出通道包括：
数据暂存模块，其用于根据接收到的数字影像信号生成第一驱动信号；
数模转换模块，其与所述数据暂存模块连接，用于对所述第一驱动信号进行数模转换，得到第一模拟影像信号；
缓冲放大模块，其与所述数模转换模块连接，用于对所述第一模拟影像信号进行放大，得到第二模拟影像信号；
清屏模块，其与所述缓冲放大模块连接，用于根据源极选择信号将所述缓冲放大模块输出的信号拉低，以释放耦合到液晶上的电荷。
根据本发明的一个实施例，所述清屏模块包括开关单元，所述开关单元的第一外接端口和第二外接端口分别与所述缓冲放大模块的输出端和地线连接，所述开关单元的控制端口与用于传输所述源极选择信号的信号选择线连接。
根据本发明的一个实施例，各个输出通道中开关单元的控制端与同一信号选择线连接。
根据本发明的一个实施例，所述开关单元包括场效应晶体管，所述场效应晶体管的源极和漏极分别形成所述开关单元的第一外接端口和第二外接端口，栅极形成所述开关单元的控制端口。
根据本发明的一个实施例，所述数据暂存模块包括第一数据暂存单元和第二数据暂存单元，所述第二数据暂存单元连接在所述第一数据暂存单元与数模转换模块之间。
根据本发明的一个实施例，所述源极驱动电路还包括：
源极选择信号生成模块，其与所述清屏模块连接，用于通过生成的源极选择信号控制所述清屏模块来将缓冲放大模块输出的信号拉低。
根据本发明的一个实施例，所述每个输出通道还包括：
电平转换模块，其连接在所述数据暂存模块与模数转换模块之间，用于对所述第一驱动信号进行电平转换。
本发明还提供了一种驱动液晶显示面板的方法，所述方法采用如上任一项所述的源极驱动电路进行驱动，其包括：
在第一显示时段内，将源极选择信号配置为第一电平以控制清屏模块保持缓冲放大电路输出端为高阻态，同时，将GOA电路配置为输出低电平信号；
在第二显示时段内，将所述源极选择信号配置为第二电平以控制所述清屏模块将所述缓冲放大模块输出的信号拉低，同时，将GOA电路配置为输出扫描信号。
根据本发明的一个实施例，所述第一显示时段包括n个相邻的显示帧和第n+1个显示帧的触摸扫描时段，所述第二显示时段包括第n+1个显示帧的黑屏待机时段。
本发明还提供了一种液晶显示面板，所述液晶显示面板包括如上任一项所述的源极驱动电路。
本发明所提供的液晶面板通过在某一时段内将源极驱动电路的输出端与地连接，并同时使得GOA电路输出扫描信号并持续至少一次扫描扫描周期，这样也就能够有效清除In-cell液晶显示面板在处于待机模式下时因触摸侦测扫描而耦合到液晶上的电荷，从而避免了液晶因长时间处于同一极性而被极化。同时，相较于现有的源极驱动电路，本发明所提供的源极驱动电路的功耗更低。
本发明的其它特征和优点将在随后的说明书中阐述，并且，部分地从说明书中变得显而易见，或者通过实施本发明而了解。本发明的目的和其他优点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要的附图做简单的介绍：
图1是现有的液晶显示面板的结构示意图；
图2是现有的液晶显示面板的工作时序图；
图3是现有的液晶显示面板的待机时序图；
图4是现有的液晶显示面板的部分电路示意图；
图5是根据本发明一个实施例的源极驱动电路中某一输出通道的结构示意图；
图6是根据本发明一个实施例的液晶显示面板的待机时序图。
具体实施方式
以下将结合附图及实施例来详细说明本发明的实施方式，借此对本发明如何应用技术手段来解决技术问题，并达成技术效果的实现过程能充分理解并据以实施。需要说明的是，只要不构成冲突，本发明中的各个实施例以及各实施例中的各个特征可以相互结合，所形成的技术方案均在本发明的保护范围之内。
同时，在以下说明中，出于解释的目的而阐述了许多具体细节，以提供对本发明实施例的彻底理解。然而，对本领域的技术人员来说显而易见的是，本发明可以不用这里的具体细节或者所描述的特定方式来实施。
针对现有Full In-cell液晶显示面板在处于待机模式时液晶因长时间处于同一极性而被极化的问题，本实施例提出了一种新型的液晶显示面板的源极驱动电路。其中，该源极驱动电路包括多个结构相同的输出通道，图5示出了该电路中第一输出通道500的结构示意图。
如图5所示，第一输出通道500与数据线S1连接，其包括：数据暂存模块501、电平转换模块502、数模转换模块503、缓冲放大模块504以及清屏模块505。数据暂存模块501能够存储用于输出到扫描线所对应的亚像素上的数据。
本实施例中，数据暂存模块501优选地包含2个数据暂存单元，即第一数据暂存单元和第二数据暂存单元。其中，第二数据暂存单元连接在第一数据暂存单元与电平转换模块502之间。这样，当利用第二数据暂存单元所存储的数据开始向第n-1行扫描线上的亚像素充电时，就可以开始将第n行扫描线上亚像素所对应的数据存储到第一数据暂存单元中。
而如果数据转存模块只包含一个数据暂存单元(例如第一数据暂存单元)的话，那么只有在第n-1行扫描线上的亚像素完成充电后，该数据暂存单元才能够开始存储第n行扫描线上亚像素所对应的数据。相较于本实施例所采用的两数据暂存单元的结构，现有的这种采用一数据暂存单元结构的源极驱动电路显然较更为费时。
对于不同类型的液晶显示面板，源极驱动电路中所需要的总数量是不同的。例如对于6bit的Full HD液晶显示屏为例，源极驱动电路中共需要69120个数据暂存单元。
由于在模数转换模块503中，在选择gamma电压时，需要打开相应的晶体管。而数据暂存模块501所输出的第一驱动信号的最高电平通常为3.3V，因此就需要利用电平转 换模块502来对第一驱动信号进行电平转换，以得到电平更高的信号(即第二驱动信号)。
需要说明的是，在本发明的其他实施例中，当数据暂存模块501输出的第一驱动信号的电平足以满足数模转换模块503的要求时，源极驱动电路中也可以不配置电平转换模块502，本发明不限于此。
数模转换模块503与电平转换模块502连接，用于对电平转换模块502输出的第二驱动信号进行模数转换，从而得到对应的第一模拟影像信号。由此，数模转换模块503便根据不同的第二驱动信号得到了用于驱动液晶显示不同灰阶的电压。
由于数模转换模块503所产生的第一模拟影像信号的电平是靠电阻分压的方式产生的，因此，电阻的比例也就决定了第一模拟影像信号的电平。而在这种结构下，当外界温度或芯片制程发生改变时，数模转换模块503所输出的第一模拟影像信号的电平将不会发生改变。
然而，分压电阻的绝对值会影响功率消耗与驱动能力。分压电阻的电阻值越大，分压电阻所消耗的功率就越小，但此时分压电阻也越容易受到负载的影响而使得所输出的第一模拟影像信号的电平发生改变。因此，为了降低功率消耗，分压电阻就必须使用较大的阻值，同时还需要减小第一模拟影像信号的负载。因此，本实施例所提供的源极驱动电路中设置了缓冲放大模块505，以对第一模拟影像信号进行放大得到第二模拟影像信号，从而提高了模拟影像信号的驱动能力。
具体地，本实施例中，缓冲放大模块504优选地采用由运算放大器构成的跟随器电路来实现。当然，在本发明的其他实施例中，缓冲放大模块504还可以采用其他合理的元器件和电路形式来实现，本发明不限于此。
如图5所示，清屏模块505与缓冲放大模块504连接。具体地，本实施例中，清屏模块505包括开关单元T1，其中，开关单元T1的第一外接端口和第二外接端口分别与缓冲放大模块504的输出端和地线连接，开关单元T1的控制端口与用于传输源极选择信号Sel的信号选择线连接。清屏模块505能够在源极选择信号的控制下将缓冲放大模块504输出的信号拉低，从而释放耦合到液晶上电容。
本实施例中，开关单元T1采用场效应管来实现。其中，场效应管的源极和漏极分别形成开关单元T1的第一外接端口和第二外接端口，栅极形成开关单元T1的控制端口。
需要说明的是，在本发明的其他实施例中，开关单元T1还可以采用其他合理的元器件或电路形式来实现，本发明不限于此。
本实施例中，用于控制清屏模块505的源极选择信号是由源极选择信号生成模块来 产生的。需要指出的是，在本发明的不同实施例中，源极选择信号生成模块既可以集成在源极驱动电路中，也可以由液晶显示面板中的其他电路来充当，本发明不限于此。
当液晶显示面板处于待机模式下时，在第一显示时段内，源极选择信号生成模块生成第一电平的源极选择信号，同时，缓冲放大电路504此时的输出状态为高阻态。此时，用于产生扫描信号的GOA电路所输出的信号为低电平信号。
而在第二显示时段内，源极选择信号生成模块生成第二电平的源极选择信号，从而控制清屏模块505将缓冲放大模块504的输出信号拉低。此时，GOA电路逐行向扫描线输出扫描信号。这样，耦合到液晶上的电荷便得以释放，从而避免了液晶被极化。
图6示出了本实施例中液晶显示面板的待机时序图。
如图6所示，本实施例中，在第1帧到第n帧的时段内，AP板输出的黑屏待机信号为低电平。在此期间，GOA电路持续输出低电平信号。同时，在每一帧的触摸扫描阶段，持续向触摸探测器输入触摸扫描信号来检测液晶显示面板是否被触摸；而在每一帧的黑屏待机待机阶段，持续向触摸探测器输入公共电极信号来使得触摸探测器作为公共电极。这样也就实现了触摸探测器的分时复用。同时，在此期间，源极驱动电路不进行信号输出而保持高阻态。
在第n+1帧内，AP板输出的黑屏待机信号为低电平。在第n+1帧的触摸扫描阶段内，仍持续向触摸探测器输入触摸扫描信号来检测液晶显示面板是否被触摸。在触摸扫描阶段内，源极驱动电路仍不进行信号输出而保持高阻态。在第n+1帧的黑屏待机阶段内，GOA电路逐行向扫描线输出扫描信号，同时，源极选择信号生成模块生成高电平的源极选择信号。清屏模块505接收到高电平的源极选择信号后会将缓冲放大模块504的输出端与地线连通，从而将缓冲放大模块504所输出的信号拉低。本实施例中，第n+1帧的黑屏待机阶段也可以成为清屏阶段。
由于本实施例中各个输出通道中清屏模块的动作相同，即各个清屏模块与同一选择信号线Sel连接，因此在第n+1帧的黑屏待机阶段内，各个输出通道的缓冲放大模块504的输出端均被连接到地线。由于此时与各条扫描线连接的TFT开关相继打开，这样也就将图3中VA点和VB点与地线连通，从而使得VA点和VB点处因触摸侦测扫描耦合到的电荷得以释放，进而避免了液晶因长时间处于同一极性而被极化。
在第n+2帧，液晶显示面板中各个模块的工作状态与第1帧到第n帧相同，在此不再赘述。
需要指出的是，在本发明的不同实施例中，前述的n的取值可以综合考虑待机功耗以及计划风险实际调试来通过AP板设定为不同的合理值，本发明不限于此。
从上述描述中可以看出，本实施例所提供的液晶面板通过在某一时段内将源极驱动电路的输出端与地连接，并同时使得GOA电路输出扫描信号并持续至少一次扫描扫描周期，这样也就能够有效清除In-cell液晶显示面板在处于待机模式下时因触摸侦测扫描而耦合到液晶上的电荷，从而避免了液晶因长时间处于同一极性而被极化。同时，相较于现有的源极驱动电路，本实施例所提供的源极驱动电路的功耗更低。
应该理解的是，本发明所公开的实施例不限于这里所公开的特定结构或处理步骤，而应当延伸到相关领域的普通技术人员所理解的这些特征的等同替代。还应当理解的是，在此使用的术语仅用于描述特定实施例的目的，而并不意味着限制。
说明书中提到的“一个实施例”或“实施例”意指结合实施例描述的特定特征、结构或特性包括在本发明的至少一个实施例中。因此，说明书通篇各个地方出现的短语“一个实施例”或“实施例”并不一定均指同一个实施例。
为了方便，在此使用的多个项目、结构单元和/或组成单元可出现在共同列表中。然而，这些列表应解释为该列表中的每个元素分别识别为单独唯一的成员。因此，在没有反面说明的情况下，该列表中没有一个成员可仅基于它们出现在共同列表中便被解释为相同列表的任何其它成员的实际等同物。另外，在此还可以连同针对各元件的替代一起来参照本发明的各种实施例和示例。应当理解的是，这些实施例、示例和替代并不解释为彼此的等同物，而被认为是本发明的单独自主的代表。
虽然上述示例用于说明本发明在一个或多个应用中的原理，但对于本领域的技术人员来说，在不背离本发明的原理和思想的情况下，明显可以在形式上、用法及实施的细节上作各种修改而不用付出创造性劳动。因此，本发明由所附的权利要求书来限定。

Claims (20)

  1. 一种源极驱动电路，其中，包括多个输出通道，每个输出通道包括：
    数据暂存模块，其用于根据接收到的数字影像信号生成第一驱动信号；
    数模转换模块，其与所述数据暂存模块连接，用于对所述第一驱动信号进行数模转换，得到第一模拟影像信号；
    缓冲放大模块，其与所述数模转换模块连接，用于对所述第一模拟影像信号进行放大，得到第二模拟影像信号；
    清屏模块，其与所述缓冲放大模块连接，用于根据源极选择信号将所述缓冲放大模块输出的信号拉低，以释放耦合到液晶上的电荷。
  2. 如权利要求1所述的源极驱动电路，其中，所述清屏模块包括开关单元，所述开关单元的第一外接端口和第二外接端口分别与所述缓冲放大模块的输出端和地线连接，所述开关单元的控制端口与用于传输所述源极选择信号的信号选择线连接。
  3. 如权利要求2所述的源极驱动电路，其中，各个输出通道的开关单元的控制端与同一信号选择线连接。
  4. 如权利要求2所述的源极驱动电路，其中，所述开关单元包括场效应晶体管，所述场效应晶体管的源极和漏极分别形成所述开关单元的第一外接端口和第二外接端口，栅极形成所述开关单元的控制端口。
  5. 如权利要求1所述的源极驱动电路，其中，所述数据暂存模块包括第一数据暂存单元和第二数据暂存单元，所述第二数据暂存单元连接在所述第一数据暂存单元与数模转换模块之间。
  6. 如权利要求1所述的源极驱动电路，其中，所述源极驱动电路还包括：
    源极选择信号生成模块，其与所述清屏模块连接，用于通过生成的源极选择信号控制所述清屏模块来将缓冲放大模块输出的信号拉低。
  7. 如权利要求1所述的源极驱动电路，其中，所述每个输出通道还包括：
    电平转换模块，其连接在所述数据暂存模块与模数转换模块之间，用于对所述第一驱动信号进行电平转换。
  8. 一种液晶显示面板，其中，所述液晶显示面板中配置有源极驱动电路，所述源极驱动电路包括：
    数据暂存模块，其用于根据接收到的数字影像信号生成第一驱动信号；
    数模转换模块，其与所述数据暂存模块连接，用于对所述第一驱动信号进行数模转换，得到第一模拟影像信号；
    缓冲放大模块，其与所述数模转换模块连接，用于对所述第一模拟影像信号进行放大，得到第二模拟影像信号；
    清屏模块，其与所述缓冲放大模块连接，用于根据源极选择信号将所述缓冲放大模块输出的信号拉低，以释放耦合到液晶上的电荷。
  9. 如权利要求8所述的液晶显示面板，其中，所述清屏模块包括开关单元，所述开关单元的第一外接端口和第二外接端口分别与所述缓冲放大模块的输出端和地线连接，所述开关单元的控制端口与用于传输所述源极选择信号的信号选择线连接。
  10. 如权利要求9所述的液晶显示面板，其中，各个输出通道的开关单元的控制端与同一信号选择线连接。
  11. 如权利要求9所述的液晶显示面板，其中，所述开关单元包括场效应晶体管，所述场效应晶体管的源极和漏极分别形成所述开关单元的第一外接端口和第二外接端口，栅极形成所述开关单元的控制端口。
  12. 如权利要求8所述的液晶显示面板，其中，所述数据暂存模块包括第一数据暂存单元和第二数据暂存单元，所述第二数据暂存单元连接在所述第一数据暂存单元与数模转换模块之间。
  13. 如权利要求8所述的液晶显示面板，其中，所述源极驱动电路还包括：
    源极选择信号生成模块，其与所述清屏模块连接，用于通过生成的源极选择信号控制所述清屏模块来将缓冲放大模块输出的信号拉低。
  14. 如权利要求8所述的液晶显示面板，其中，所述每个输出通道还包括：
    电平转换模块，其连接在所述数据暂存模块与模数转换模块之间，用于对所述第一驱动信号进行电平转换。
  15. 一种驱动液晶显示面板的方法，其中，所述方法所采用预设源极驱动电路进行驱动，所述预设源极驱动电路包括：
    数据暂存模块，其用于根据接收到的数字影像信号生成第一驱动信号；
    数模转换模块，其与所述数据暂存模块连接，用于对所述第一驱动信号进行数模转换，得到第一模拟影像信号；
    缓冲放大模块，其与所述数模转换模块连接，用于对所述第一模拟影像信号进行放大，得到第二模拟影像信号；
    清屏模块，其与所述缓冲放大模块连接，用于根据源极选择信号将所述缓冲放大模块输出的信号拉低，以释放耦合到液晶上的电荷；
    所述方法包括：
    在第一显示时段内，将源极选择信号配置为第一电平以控制所述清屏模块保持所述缓冲放大电路输出端为高阻态，同时，将GOA电路配置为输出低电平信号；
    在第二显示时段内，将所述源极选择信号配置为第二电平以控制所述清屏模块将所述缓冲放大模块输出的信号拉低，同时，将GOA电路配置为输出扫描信号。
  16. 如权利要求15所述的方法，其中，所述第一显示时段包括n个相邻的显示帧和第n+1个显示帧的触摸扫描时段，所述第二显示时段包括第n+1个显示帧的黑屏待机时段。
  17. 如权利要求15所述的方法，其中，所述清屏模块包括开关单元，所述开关单元的第一外接端口和第二外接端口分别与所述缓冲放大模块的输出端和地线连接，所述开关单元的控制端口与用于传输所述源极选择信号的信号选择线连接。
  18. 如权利要求17所述的方法，其中，各个输出通道的开关单元的控制端与同一信号选择线连接。
  19. 如权利要求15所述的方法，其中，所述数据暂存模块包括第一数据暂存单元和第二数据暂存单元，所述第二数据暂存单元连接在所述第一数据暂存单元与数模转换模块之间。
  20. 如权利要求15所述的方法，其中，所述源极驱动电路还包括：
    源极选择信号生成模块，其与所述清屏模块连接，用于通过生成的源极选择信号控制所述清屏模块来将缓冲放大模块输出的信号拉低。
PCT/CN2015/092183 2015-09-08 2015-10-19 源极驱动电路、液晶显示面板及其驱动方法 WO2017041348A1 (zh)

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