WO2015192604A1 - 双面触控的显示面板、装置及驱动方法 - Google Patents

双面触控的显示面板、装置及驱动方法 Download PDF

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Publication number
WO2015192604A1
WO2015192604A1 PCT/CN2014/092519 CN2014092519W WO2015192604A1 WO 2015192604 A1 WO2015192604 A1 WO 2015192604A1 CN 2014092519 W CN2014092519 W CN 2014092519W WO 2015192604 A1 WO2015192604 A1 WO 2015192604A1
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touch
electrode
driving
signal
display
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PCT/CN2014/092519
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English (en)
French (fr)
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邹祥祥
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京东方科技集团股份有限公司
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Publication of WO2015192604A1 publication Critical patent/WO2015192604A1/zh

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    • 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
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer

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  • Embodiments of the present invention relate to a double-sided touch display panel, apparatus, and driving method.
  • the touch display device combines touch technology and display technology, and is capable of realizing human-computer interaction simply, conveniently, and naturally, and is currently developing rapidly.
  • touch display devices can be divided into five basic types: vector pressure sensing, resistance sensing, capacitive sensing, infrared sensing and surface acoustic wave sensing.
  • the capacitive touch display can include three types: an add-on mode, an on-cell mode, and an in-cell mode.
  • mobile terminals on the market mostly use integrated capacitive sensing technology.
  • Capacitive sensing uses a driving line (or driving electrode) and a sensing line (sensing electrode) arranged in a crisscross pattern, and a touch driving signal is loaded on the driving line, and a detection output signal is detected on the sensing line, and the sensing line is connected between the driving line and the driving line.
  • the capacitance changes to determine the location of the touch point. Since the capacitive sensing technology generally needs to be touched on the terminal screen, the user needs to use a finger or a capacitive pen to touch during the touch process, and the screen line of sight is easily blocked, which affects the control efficiency; and, in some cases, the touch display device (such as mobile phones) screens are limited, and the current single touch mode can no longer meet the increasingly rich operational needs.
  • At least one embodiment of the present invention provides a double-sided touch display panel, a device, and a driving method, which can realize two-sided touch of the display device, reduce screen line occlusion, and improve handling efficiency.
  • At least one embodiment of the present invention provides a driving method suitable for a double-sided touch display device, wherein the display device includes a touch driving electrode and a common electrode, and a display scan time of one frame image includes a display driving period, first a touch driving period and a second touch driving period; the driving method includes: loading a common voltage signal for display to the common electrode in a display driving period; loading the touch driving electrode in a first touch driving period a first sensing surface touch signal scanning of the display device is performed by a touch driving signal; and loading the touch driving electrode into the second touch driving period The second touch surface of the display device scans the second sensing surface of the display device.
  • At least one embodiment of the present invention further provides a double-sided touch display panel, the display panel including a first substrate and a second substrate disposed opposite to each other.
  • the display panel includes: a touch driving electrode for loading a first touch driving signal or a second touch driving signal; and a first touch sensing electrode for receiving a touch action by the first substrate or the second substrate The induced feedback signal; the common electrode for receiving the common electrode signal.
  • the touch driving electrode and the common electrode are located between the first substrate and the second substrate, and the touch driving electrode is insulated from the first touch sensing electrode.
  • At least one embodiment of the present invention also provides a double-sided touch display device including the above display panel.
  • the display scan time of one frame image includes a display driving period, a first touch driving period, and a second touch driving period, in the driving period Loading a display signal for display; loading a first touch driving signal to the touch driving electrode in a first touch detection phase to perform a first sensing surface touch signal scanning; and loading a second second to the touch driving electrode in a second touch detecting phase
  • the touch driving signal is used to scan the second sensing surface touch signal, which can realize the two-side touch of the display device, reduce the screen line occlusion, and improve the control efficiency.
  • FIG. 1 is a flowchart of a driving method according to an embodiment of the present invention
  • FIG. 2 is a first schematic diagram of an operation example of a double-sided touch display device according to an embodiment of the present invention
  • FIG. 3 is a second schematic diagram of an operation example of a double-sided touch display device according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a double-sided touch display panel according to an embodiment of the present invention.
  • FIG. 5 is a timing diagram of driving according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a double-sided touch display panel according to another embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a schematic structure of a common electrode layer according to another embodiment of the present invention.
  • At least one embodiment of the present invention provides a driving method suitable for a double-sided touch display device, the display device includes a touch driving electrode and a common electrode, and a display scan time of one frame image includes a display driving period, first The touch driving period and the second touch driving period; as shown in FIG. 1, the driving method includes the following steps:
  • the first touch driving signal is loaded to the touch driving electrode during the first touch driving period, and the first sensing surface touch signal of the display device is scanned.
  • the driving method provided by at least one embodiment of the present invention is applicable to a double-sided touch display device, as shown in FIG. 2 and FIG. 3, respectively, which are schematic diagrams of two operation examples of the double-sided touch display device; In the case of a large size, Figure 3 shows the case of a small size.
  • the front and back sides can simultaneously perform touch operations, just like multi-point simultaneous operation.
  • the front side and the back side which are capable of simultaneously performing the touch operation are defined as the first sensing surface and the second sensing surface, respectively.
  • the embodiment of the present invention is not limited to the specific display principle of the display device.
  • the double-sided touch display device may be a double-sided touch liquid crystal display device, or may be double-sided touch.
  • the double-sided touch display device of the embodiment of the present invention may be a single-sided display double-sided touch or a double-sided display double-sided touch.
  • the driving method of the at least one embodiment of the present invention divides the time of one frame into a display driving period, a first touch driving period, and a second touch driving period, and the three periods (ie, the display driving period, the first The touch driving period and the second touch driving period are not overlapped with each other, and are not limited to the above order.
  • the display driving period is as shown in step 101, and the display signal is loaded for screen display. This can be performed by any display driving method well known to those skilled in the art. The specific implementation process will not be repeated here.
  • the first touch sensing period and the second touch driving period respectively perform touch detection on the first sensing surface and the second sensing surface, and may also be any touch detection manner known to those skilled in the art.
  • an example implementation process is as follows: a touch driving signal (a first touch driving signal or a second touch driving signal) is loaded one by one to a touch driving electrode, and a touch point position is determined by detecting a change in capacitance between the sensing electrode and the driving electrode.
  • a touch driving signal a first touch driving signal or a second touch driving signal
  • first touch driving signal and the second touch driving signal may be pulse signals having different amplitudes.
  • the amplitude of the first and second touch drive signals ie, the amplitude of the touch drive signal
  • the driving method provided by at least one embodiment of the present invention performs display and touch detection in a time-sharing manner, and performs front and back touch detection on the touch detection stage, thereby achieving two-sided touch of the display device, reducing screen line occlusion and improving manipulation. Efficiency; and, different signal scans at different times can avoid crosstalk and effects between different signals.
  • the touch driving electrode and the common electrode may share the same electrode, and the electrodes only load different signals at different time intervals, and scan and display different signals, and the structure is further simplified.
  • the display scan time of the one-frame image may further include a noise scan period
  • the driving method further includes: loading the touch drive electrode to cancel noise during the noise scan period Noise scanning signal.
  • a noise scanning period is set before the first touch detection phase, that is, before the step 102, the signal for noise detection is first loaded to the touch driving electrode, and one or more noise scans are performed; then the first touch driving signal is loaded again. The first sensing surface touch signal is scanned.
  • FIG. 4 is a schematic structural diagram of a double-sided touch display panel according to an embodiment of the present invention.
  • the double-sided touch display device is provided with a touch driving electrode 11 , a touch sensing electrode 12 and a second touch sensing electrode 13 for the first touch sensing electrode 12
  • the second touch sensing electrode 13 is configured to receive a feedback signal caused by a touch action of the second sensing surface 200 when receiving a feedback signal caused by a touch action of the first sensing surface 100.
  • the driving method of the embodiment divides the time of one frame into a display driving period, a first touch driving period, and a second touch driving period, and the first touch driving period performs the first sensing surface touch detection, and the second touch driving period Perform a second sensing surface touch detection.
  • a signal for noise detection such as a short pulse (Burst) signal, may be applied to the touch driving electrode to perform one or more noise scanning, according to one or more noise scanning results.
  • the above method can eliminate the influence of noise on the touch and improve the touch sensitivity.
  • the noise that affects the touch described here has many causes, including but not limited to the ambient humidity or temperature, the influence of the display signal, etc., which cannot be enumerated one by one.
  • the noise scanning period may also be set before the second touch detection phase of step 103, that is, the signal for noise detection is first loaded to the touch driving electrode, and one or more noise scans are performed; then the second touch driving signal is loaded. The second sensing surface touch signal is scanned. Based on the reasons detailed above, noise scanning can eliminate the influence of noise on touch and improve touch sensitivity.
  • the driving method described above can realize the two-side touch of the display device, reduce the screen line occlusion and improve the control efficiency; and the driving method can also avoid crosstalk and influence between different signals, eliminate the influence of noise on the touch, and improve Touch sensitivity.
  • At least one embodiment of the present invention further provides a double-sided touch display panel, which can be operated by the above driving method.
  • the display panel includes a first substrate and a second substrate disposed opposite to each other; and the display panel includes: a touch driving electrode for loading a first touch driving signal or a second touch driving signal; and the first touch sensing electrode And for receiving a feedback signal caused by a touch action of the first substrate or the second substrate; and a common electrode for receiving the common electrode signal.
  • the touch driving electrode and the common electrode are located between the first substrate and the second substrate, and the touch driving electrodes and the first touch sensing electrodes are insulated from each other.
  • a display panel loads a common voltage signal for display to a common electrode during a display driving period; and loads a first touch driving signal to a touch driving electrode during a first touch driving period to perform a display device a sensing surface touch signal scanning; loading a second touch driving signal to the touch driving electrode during the second touch driving period, and performing a second sensing surface touch of the display device
  • the signal is scanned to realize the display of the display device and the two-sided touch in a time-sharing manner; and different signal scanning is performed in different time periods to avoid crosstalk and influence between different signals.
  • the display panel when the first touch sensing electrode is only used to receive a feedback signal caused by a touch action of one of the first substrate and the second substrate, the display panel further includes a second touch sensing The second touch sensing electrode and the touch driving electrode are insulated from each other for receiving a feedback signal caused by a touch action on the other of the first substrate and the second substrate.
  • the touch driving electrode and the common electrode may share the same electrode, which simplifies the panel structure.
  • the touch driving electrode, the common electrode, and the first touch sensing electrode may be located in the same layer, which can reduce the thickness of the panel and achieve thinness and thinness.
  • the double-sided touch display panel includes a first substrate 14 and a second substrate 18 disposed opposite to each other.
  • the first substrate 18 has a first sensing surface 100 for performing a touch operation
  • the second substrate has a second sensing surface 200 for performing a touch operation
  • the display panel includes a touch driving electrode 11 for loading the first touch driving Signal or second touch drive signal.
  • the touch driving electrode 11 is configured to load the first touch driving signal in the first touch detection phase, and load the second touch driving signal in the second touch detection phase
  • the first touch sensing electrode 12 is used in the touch detection phase.
  • the first time period receives the feedback signal caused by the touch action of the first sensing surface 100
  • the second touch sensing electrode 13 is configured to receive the touch action by the second sensing surface 200 during the second time period of the touch detection phase. The resulting feedback signal.
  • the display panel provided by at least one embodiment of the present invention performs touch detection on the front side (first sensing surface 100) and the back surface (second sensing surface 200) in a touch detection phase, thereby achieving two-sided touch of the display device and reducing the screen.
  • the line of sight is occluded to improve the control efficiency; and different signal scanning is performed at different times to avoid crosstalk and influence between different signals.
  • the display panel further includes: a common electrode for loading a common voltage during the display phase.
  • the touch driving electrodes 11 can be disposed in the same layer as the common electrodes, for example, the common electrodes are patterned, and the touch driving electrodes 11 are respectively distributed in the gaps of the common electrodes. The preparation is simple, and the advantages of panel thickness and transmittance are reduced.
  • the common electrode may also be combined with the touch driving electrode 11 , that is, the common electrode also functions as a touch driving electrode during the non-display period.
  • the common electrode layer connected to the entire surface of the TFT array substrate is divided to form a plurality of regions insulated from each other, for example, each region may be an elongated electrode, and the elongated electrode is loaded with a common voltage during the display phase to serve as a common An electrode; the elongated electrode loads the first and second touch driving voltages in a touch detection phase to serve as a touch driving electrode, as indicated by reference numeral 11 in FIG.
  • the common electrode is shared with the touch drive electrode to avoid the influence of the common electrode during the touch detection phase and reduce the signal to noise ratio.
  • FIG. 4 is only a specific implementation manner of the display panel that conforms to the double-sided touch of the embodiment, and is not limited to the understanding, and the first substrate may be an array substrate or a color film.
  • the substrate may be a color film substrate or an array substrate.
  • the first substrate is a color filter substrate
  • the second substrate is an array substrate, and vice versa.
  • the first substrate is a color film substrate and the second substrate is an array substrate.
  • the first substrate is a color film substrate and the second substrate is an array substrate.
  • the display panel shown in FIG. 4 includes a first substrate 14 (ie, a color filter substrate) and a second substrate 18 (ie, an array substrate) that are opposite to each other, and a color film 15 disposed on the first substrate 14 is disposed at the first a first touch sensing electrode 12 on the substrate 14 , a TFT layer 17 disposed on the second substrate 18 , a second touch sensing electrode 13 disposed on the second substrate 18 and away from the opposite surface of the first substrate, and Common electrode layer.
  • a first substrate 14 ie, a color filter substrate
  • a second substrate 18 ie, an array substrate
  • the first touch sensing electrode 12 is disposed on the back side of the first substrate, that is, the outer side of the first substrate; of course, the first touch sensing electrode 12 may also be disposed on the other side of the first substrate, that is, the inner side of the first substrate. .
  • the second touch sensing electrode 13 is disposed on the outer side of the second substrate, and may be disposed on the inner side of the second substrate.
  • the common electrode layer includes a plurality of elongated electrodes (ie, referred to as 11 in FIG. 4), and the common electrode shares the elongated electrode with the touch driving electrodes.
  • a liquid crystal 16 is interposed between the color filter substrate and the array substrate.
  • FIG. 5 is a timing diagram showing a driving method for implementing at least one embodiment of the present invention, in which a display signal is scanned first and then a touch signal is scanned.
  • the scanning time of the touch signal is divided into two parts: the first touch driving period and the second touch driving period.
  • the touch signal is scanned during the first touch driving period, the front side (ie, the first sensing surface) touches;
  • the touch signal scanning of the second touch driving period is started, and the touch is performed on the reverse side (ie, the second sensing surface).
  • one or more noise scans are performed first during the touch scan to eliminate the influence of noise, and the touch signal is scanned after the noise scan is completed.
  • the burst signal is used for noise scanning, and the display signal, the burst signal, and the touch signal are time-divisionally driven during the entire frame time, and different signal scanning is performed in different time periods, thereby avoiding crosstalk before different signals and influences.
  • the scanning signals of the front and back touch signals can be the same, but the amplitudes of the touch driving signals are different for the scanning timing. Since the positions of the front and back touch points are different from the common electrode layer, for example, for the display device shown in FIG. 4, the common electrode layer is located on the array substrate, so generally, d 1 >d 2 , d 1 is the front touch The distance from the point to the common electrode layer, d1 is the distance from the back touch point to the common electrode layer, which is known by the following capacitance formula (1):
  • the difference in capacitance generated when the front and back touch operations are performed separately (d 1 >d 2 , thus C 1 ⁇ C 2 ), the signal strength received on the sensing electrode is different, and for FIG. 4
  • the signal strengths V1 and V2 received on the first and second touch sensing electrodes satisfy V2 ⁇ V1.
  • the two parts of the touch signal (mainly the touch signal amplitude) should be debugged separately.
  • the signal strengths of the first and second touch drive signals loaded on the touch drive electrode (TX) are generally between the common voltage VCOM and the operating voltage VDD (the maximum range that the IC can provide), and then according to the actual touch feedback.
  • the first touch sensing electrode 12 and the second touch sensing electrode 13 can share the same electrode, that is, only one sensing electrode exists, but only the time scanning is performed in the touch detection phase, the first time period The touch of the first sensing surface (front side) is detected, and the second time period detects the touch of the second sensing surface (reverse surface).
  • the shared sensing electrode may be disposed in the same layer as the touch driving electrode.
  • the common electrode layer and the touch layer are disposed in the same layer (as shown by 19 in FIG. 6 ).
  • the common electrode layer is patterned, and the common electrode layer includes: a first inductive electricity layer disposed in the same layer as each other.
  • the pole 20 and the touch driving electrode 11, the first sensing electrode 20 and the touch driving electrode 11 are all made of a transparent conductive material 23, and the first sensing electrode 20 and the touch driving electrode 11 are separated by an insulating material 22, The portions of the control drive electrode 11 are connected to each other through a transparent bridge 21.
  • the touch driving electrode 11 is loaded with a common voltage during the display phase to serve as a common electrode; in the first touch detection phase, the touch driving electrode 11 loads the first touch driving signal, and the first sensing electrode 20 cooperates with the first sensing electrode 20; The first sensing surface touch signal is scanned; in the second touch detection phase, the touch driving electrode 11 loads the second touch driving signal, and the first sensing electrode 20 cooperates with the second sensing surface 200 to scan the touch signal.
  • the common electrode layer is patterned and shared with the touch driving electrode (TX)/first sensing electrode (RX), and the common electrode layer simultaneously serves as a touch layer for detecting the front and back touch signals, which can be realized without increasing the transparent display.
  • the two-sided touch of the display device is achieved with a thickness and a reduced transmittance.
  • At least one embodiment of the present invention provides a double-sided touch display device including any of the above display panels.
  • the display device performs touch detection on the front and back sides in the touch detection stage, thereby realizing two-sided touch of the display device, which can reduce the screen line occlusion and improve the control efficiency; and, for different signal scanning in different time, Avoid crosstalk and effects between different signals for higher display quality.
  • the display device may be any product or component having a display function such as a liquid crystal panel, an electronic paper, an OLED panel, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, a watch, and the like.
  • a display function such as a liquid crystal panel, an electronic paper, an OLED panel, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, a watch, and the like.
  • first and second words are used in the present invention to classify similar items.
  • the first and second words do not limit the scope of protection of the present invention in terms of quantity, but only for a preferred one.
  • the exemplified manners of the present invention are obvious to those skilled in the art in view of the disclosure of the present invention.
  • the program may be implemented by a computer program to instruct related hardware, and the program may be stored in a computer readable storage medium, which, when executed, may include the flow of an embodiment of the methods described above.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Abstract

一种双面触控的显示面板、装置及驱动方法，所述显示装置包含触控驱动电极(11)和公共电极，一帧图像的显示扫描时间包含显示驱动时段、第一触控驱动时段、第二触控驱动时段；该驱动方法包括：在显示驱动时段向所述公共电极加载用于显示的公共电压信号；在第一触控驱动时段向所述触摸驱动电极加载第一触摸驱动信号，进行所述显示装置的第一感应面(100)触控信号扫描；在第二触控驱动时段向所述触摸驱动电极加载第二触摸驱动信号，进行所述显示装置的第二感应面(200)触控信号扫描。所述驱动方法能够实现显示装置的两面触控，减少屏幕视线遮挡，提高操控效率。

Description

双面触控的显示面板、装置及驱动方法 技术领域
本发明的实施例涉及一种双面触控的显示面板、装置及驱动方法。
背景技术
触摸显示装置结合了触控技术和显示技术，因其可简单、方便、自然地实现人机交互，目前发展迅速。从技术原理来区分，触摸显示装置可分为：矢量压力传感、电阻传感、电容传感、红外线传感和表面声波传感五种基本类型。按结构划分，电容式触摸显示可以包括外挂式(Add-on mode)、内嵌式(On-cell mode)和整体式(In-cell mode)三种类型。目前，市场上移动终端多采用整体式的电容传感技术。
电容传感多采用纵横交错设置的驱动线(或驱动电极)和感应线(感应电极)，在驱动线上加载触摸驱动信号，在感应线上进行检测输出信号，通过感应线与驱动线间的电容变化从而确定触控点位置。因电容传感技术一般需要在终端屏幕上进行触控，因此用户在触控过程中要使用手指或者电容笔进行触控，屏幕视线容易被遮挡，影响操控效率；而且，有些情况下触摸显示装置(如手机)屏幕有限，目前单一的触控模式已无法满足目前日益丰富的操作需求。
发明内容
本发明的至少一实施例提供一种双面触控的显示面板、装置及驱动方法，能够实现显示装置的两面触控，减少屏幕视线遮挡，提高操控效率。
本发明的至少一实施例提供一种驱动方法，适用于双面触控的显示装置，所述显示装置包含触控驱动电极和公共电极，一帧图像的显示扫描时间包含显示驱动时段、第一触控驱动时段、第二触控驱动时段；该驱动方法包括：在显示驱动时段向所述公共电极加载用于显示的公共电压信号；在第一触控驱动时段向所述触摸驱动电极加载第一触摸驱动信号，进行所述显示装置的第一感应面触控信号扫描；在第二触控驱动时段向所述触摸驱动电极加载第 二触摸驱动信号，进行所述显示装置的第二感应面触控信号扫描。
本发明至少一实施例还提供一种双面触控的显示面板，所述显示面板包括相对设置的第一基板和第二基板。所述显示面板包括：触控驱动电极，用于加载第一触摸驱动信号或者第二触摸驱动信号；第一触控感应电极，用于接收由所述第一基板或第二基板的触碰动作所引起的反馈信号；公共电极，用于接收公共电极信号。所述触控驱动电极和所述公共电极位于第一基板和第二基板之间，所述触控驱动电极与所述第一触控感应电极绝缘设置。
本发明至少一实施例还提供一种双面触控的显示装置，包括上述显示面板。
本发明实施例提供的双面触控的显示面板、装置及驱动方法，将一帧图像的显示扫描时间包含显示驱动时段、第一触控驱动时段、第二触控驱动时段，在驱动时段阶段加载显示信号进行显示；在第一触摸检测阶段向所述触摸驱动电极加载第一触摸驱动信号，进行第一感应面触控信号扫描；在第二触摸检测阶段向所述触摸驱动电极加载第二触摸驱动信号，进行第二感应面触控信号扫描，能够实现显示装置的两面触控，减少屏幕视线遮挡，提高操控效率。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本发明的一些实施例，而非对本发明的限制。
图1为本发明一实施例提供的驱动方法流程图；
图2为本发明实施例双面触控的显示装置的操作实例示意图一；
图3为本发明实施例双面触控的显示装置的操作实例示意图二；
图4为本发明一实施例提供的双面触控的显示面板的结构示意图；
图5为本发明一实施例提供的驱动时序图；
图6为本发明另一实施例提供的一种双面触控的显示面板的结构示意图；
图7为本发明另一实施例提供的公共电极层的图形结构示意图。
附图标记
100-第一感应面，200-第二感应面，11-触控驱动电极，
12-第一触控感应电极，13-第二触控感应电极，14-第一基板，15-彩膜，
16-液晶，17-TFT层，18-第二基板，19-公共电极层(触摸层)，
20-第一感应电极，21-透明导电搭桥，22-绝缘材料，23-透明导电材料。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例的附图，对本发明实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本发明的一部分实施例，而不是全部的实施例。基于所描述的本发明的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明的至少一个实施例提供一种驱动方法，适用于双面触控的显示装置，所述显示装置包含触控驱动电极和公共电极，一帧图像的显示扫描时间包含显示驱动时段、第一触控驱动时段、第二触控驱动时段；如图1所示，该驱动方法包括如下步骤：
101、在显示驱动时段向所述公共电极加载用于显示的公共电压信号；
102、在第一触控驱动时段向所述触摸驱动电极加载第一触摸驱动信号，进行所述显示装置的第一感应面触控信号扫描；
103、在第二触控驱动时段向所述触摸驱动电极加载第二触摸驱动信号，进行所述显示装置的第二感应面触控信号扫描。
本发明至少一实施例提供的驱动方法适用于双面触控的显示装置，如图2和图3所示，分别为双面触控的显示装置的两种操作实例示意图；图2所示为大尺寸的情况，图3所示为小尺寸的情况。在使用的过程中，正面和反面能够同时进行触控操作，就如同多点同时操作一样。以下叙述中将能够同时进行触控操作的正面和反面分别定义为第一感应面和第二感应面。
但应该理解，本发明的实施例对显示装置具体的显示原理并不限定，例如，所述双面触控的显示装置可以是双面触控的液晶显示装置，也可以是双面触控的有机发光(OLED)显示装置，或者其它双面触控的显示装置(例如电子纸显示装置)。本发明的实施例所述双面触控的显示装置可以是单面显示双面触控，也可以是双面显示双面触控。
本发明的至少一实施例所述驱动方法将一帧的时间划分为显示驱动时段、第一触控驱动时段和第二触控驱动时段，并且，该三个时段(即显示驱动时段、第一触控驱动时段和第二触控驱动时段)互不重叠，并且不限于上述顺序。显示驱动时段如步骤101所述加载显示信号进行画面显示，这可以采用本领域技术人员所熟知的任何显示驱动方式，具体实现过程在此不再赘述。第一触控驱动时段、第二触控驱动时段分别进行第一感应面和第二感应面的触控检测，也可以是本领域技术人员所熟知的任意触控检测方式。例如，一个示例的实现过程如下：向触摸驱动电极逐一加载触摸驱动信号(第一触摸驱动信号或第二触摸驱动信号)，通过检测感应电极与驱动电极间的电容变化从而确定触控点位置。
需要说明的是，上述的第一触摸驱动信号和第二触摸驱动信号可以分别为振幅不同的脉冲信号。第一、第二触摸驱动信号的振幅大小(即触摸驱动信号的幅值)，可以根据实际触摸反馈进行调试，具体见装置部分实施例中的叙述。
本发明至少一实施例提供的驱动方法，分时进行显示和触摸检测，在触摸检测阶段再分时进行正面和背面的触摸检测，从而实现显示装置的两面触控，减少屏幕视线遮挡，提高操控效率；并且，不同的时间内进行不同信号扫描，可以避免不同信号之间的串扰及影响。
本发明至少一实施例中，上述触控驱动电极和上述公共电极可共用同一电极，该电极只在不同的时段分时加载不同的信号，进行不同信号的扫描显示，结构进一步更为简化。
本发明至少一实施例中，所述一帧图像的显示扫描时间还可以包括噪声扫描时段，由此所述驱动方法还进一步包括：在噪声扫描时段，向所述触摸驱动电极加载用于消除噪声的噪声扫描信号。
例如，在第一触摸检测阶段之前设置噪声扫描时段，即步骤102之前，先向所述触摸驱动电极加载用于噪声检测的信号，进行一次或多次噪声扫描；然后再加载第一触摸驱动信号，进行第一感应面触控信号扫描。
下面以图4所示结构为例进行说明，图4为本发明一实施例提供的双面触控的显示面板的结构示意图，该双面触控的显示装置设置有触控驱动电极11、第一触控感应电极12和第二触控感应电极13，第一触控感应电极12用 于接收第一感应面100的触碰动作所引起的反馈信号，第二触控感应电极13用于接收第二感应面200的触碰动作所引起的反馈信号。本实施例驱动方法将一帧的时间划分为显示驱动时段、第一触控驱动时段和第二触控驱动时段，第一触控驱动时段进行第一感应面触摸检测，第二触控驱动时段进行第二感应面触摸检测。并且，在进行第一感应面触摸检测前，可向触摸驱动电极加载用于噪声检测的信号，例如短脉冲(Burst)信号，进行一次或多次噪声扫描，根据一次或多次噪声扫描的结果，获得此时影响触控的噪声；然后向各触摸驱动电极逐一加载第一触摸驱动信号，各第一触控感应电极的输出信号减去上一步噪声扫描获得的噪声，在此基础上，根据触摸驱动电极与第一触控感应电极之间的电容变化确定触控点位置，上述方法可以排除噪声对触控的影响，提高触控灵敏度。此处所述影响触控的噪声，其产生原因很多，包括但不限于环境湿度或温度，显示信号的影响等等，无法一一列举。
此外，在步骤103第二触摸检测阶段之前同样可设置噪声扫描时段，即先向所述触摸驱动电极加载用于噪声检测的信号，进行一次或多次噪声扫描；然后再加载第二触摸驱动信号，进行第二感应面触控信号扫描。基于上文已详细叙述的理由，进行噪声扫描可排除噪声对触控的影响，提高触控灵敏度。
上述所述的驱动方法可以实现显示装置的两面触控，减少屏幕视线遮挡，提高操控效率；并且，该驱动方法还可避免不同信号之间的串扰及影响，排除噪声对触控的影响，提高触控灵敏度。
本发明至少一实施例还提供一种双面触控的显示面板，可以采用上述的驱动方法进行工作。所述显示面板包括相对设置的第一基板和第二基板；并且，所述显示面板包括：触控驱动电极，用于加载第一触摸驱动信号或者第二触摸驱动信号；第一触控感应电极，用于接收由所述第一基板或第二基板的触碰动作所引起的反馈信号；公共电极，用于接收公共电极信号。所述触控驱动电极和所述公共电极位于第一基板和第二基板之间，所述触控驱动电极与所述第一触控感应电极彼此绝缘设置。
本发明至少一实施例提供的显示面板，在显示驱动时段向公共电极加载用于显示的公共电压信号；在第一触控驱动时段向触摸驱动电极加载第一触摸驱动信号，进行显示装置的第一感应面触控信号扫描；在第二触控驱动时段向触摸驱动电极加载第二触摸驱动信号，进行显示装置的第二感应面触控 信号扫描，从而分时实现显示装置的显示及两面触控；并且，不同的时间内进行不同信号扫描，可以避免不同信号之间的串扰及影响。
本发明至少一实施例中，当第一触控感应电极只用于接收第一基板和第二基板中一个的触碰动作所引起的反馈信号时，所述显示面板还包括第二触控感应电极，所述第二触控感应电极与所述触控驱动电极彼此绝缘设置，用于接收第一基板和第二基板中另一个上的触碰动作所引起的反馈信号。
本发明至少一实施例中，上述的触控驱动电极和上述的公共电极还可共用同一电极，可以简化面板结构。
本发明至少一实施例中，上述触控驱动电极、公共电极和第一触控感应电极可以位于同一层，能够降低面板厚度、实现轻薄化。
为了本领域技术人员更好的理解本发明实施例提供的显示面板的结构，下面通过具体的实施例对本发明实施例进行详细说明。
图4为本发明一实施例提供的双面触控的显示面板的结构示意图，如图4所示，所述双面触控的显示面板包括相对设置的第一基板14和第二基板18，第一基板18具有进行触控操作的第一感应面100，第二基板具有进行触控操作的第二感应面200；所述显示面板包括触控驱动电极11，其用于加载第一触摸驱动信号或者第二触摸驱动信号。例如，触控驱动电极11用于在第一触摸检测阶段加载第一触摸驱动信号，在第二触摸检测阶段加载第二触摸驱动信号；第一触控感应电极12，用于在触摸检测阶段的第一时段接收由第一感应面100的触碰动作所引起的反馈信号；第二触控感应电极13，用于在触摸检测阶段的第二时段接收由第二感应面200的触碰动作所引起的反馈信号。
本发明至少一个实施例提供的显示面板，在触摸检测阶段分时进行正面(第一感应面100)和背面(第二感应面200)的触摸检测，从而实现显示装置的两面触控，减少屏幕视线遮挡，提高操控效率；并且，不同的时间内进行不同信号扫描，可以避免不同信号之间的串扰及影响。
本发明至少一实施例中，所述显示面板还包括：用于在显示阶段加载公共电压的公共电极。上述的触控驱动电极11可以与该公共电极以彼此绝缘的方式同层设置，例如，将公共电极图形化，触控驱动电极11分别分布在所述公共电极的间隙之中，这种方式具有制备简单，可降低面板厚度及提高透过率的优点。
本发明至少一实施例中，所述公共电极还可以与触控驱动电极11合二为一，即公共电极在非显示时段内还充当触控驱动电极。例如，将TFT阵列基板中整面连接的公共电极层进行分割，形成相互绝缘的多个区域，例如每个区域可以为长条状电极，该长条状电极在显示阶段加载公共电压，充当公共电极；该长条状电极在触摸检测阶段加载分时加载第一、第二触摸驱动电压，充当触摸驱动电极，如图4中的附图标记11所示。公共电极与触摸驱动电极共用，可避免在触控检测阶段时公共电极的影响，降低信噪比。
需要注意的是，图4所示仅为符合本实施例双面触控的显示面板的一种具体实现方式，仅为便于理解，并不用于限定，另外第一基板可以为阵列基板或彩膜基板，第二基板可以为彩膜基板或阵列基板，当第一基板为彩膜基板时，第二基板为阵列基板，反之也可以。
为了本领域技术人员更好的理解本发明实施例提供的双面触控的显示面板的结构，下面以图4中第一基板为彩膜基板，第二基板为阵列基板为例对本发明进行更为详细说明。
如图4所示的显示面板包括相互对盒的第一基板14(即彩膜基板)和第二基板18(即阵列基板)，设置在第一基板14上的彩膜15，设置在第一基板14上的第一触控感应电极12；设置在第二基板18上的TFT层17，设置在第二基板18上且远离第一基板的对盒面的第二触控感应电极13，以及公共电极层。在图中第一触控感应电极12设置在第一基板的背面，即第一基板的外侧；当然第一触控感应电极12也可以设置在第一基板的另一面，即第一基板的内侧。第二触控感应电极13设置在第二基板的外侧，同理也可以设置在第二基板的内侧。公共电极层包括若干长条状电极(即图4中的11所指代的)，公共电极与触摸驱动电极共用该长条状电极。彩膜基板和阵列基板之间灌注有液晶16。
图5所示为实现本发明至少一实施例驱动方法的时序图，在一帧的时间内先进行显示信号扫描，再进行触摸信号扫描。触摸信号的扫描时间分为第一触控驱动时段和第二触控驱动时段两部分，在第一触控驱动时段的触摸信号扫描时，正面(即第一感应面)触控起作用；当第一触控驱动时段的触摸信号扫描完，再开始进行第二触控驱动时段的触摸信号扫描，此时为反面(即第二感应面)触控起作用。
为了改善TFT阵列基板上数据线的存在或其他因素产生的噪声，在进行触控扫描时先进行一次或多次噪声扫描，排除噪声的影响，完成噪声扫描之后再进行触摸信号的扫描。本实施例中采用burst信号进行噪声扫描，在整个一帧的时间里，显示信号、burst信号、触摸信号进行分时驱动，在不同的时间内进行不同信号扫描，避免了不同信号之前的串扰及影响。
需要注意的是，例如，在正反两面触控信号的扫描方式可以一样，但是对于扫描时序中触摸驱动信号的幅值不一样。由于正反两面触控点的位置距离公共电极层的距离不同，例如对于图4所示显示装置，公共电极层位于阵列基板，因此一般而言，d1>d2，d1为正面触控点到公共电极层的距离，d1为反面触控点到公共电极层的距离，由下面的电容公式(1)可知：
Figure PCTCN2014092519-appb-000001
在分别进行正反两面触控操作时产生的电容值不同(d1>d2,因此C1<C2)，在感应电极上接收到的信号强度也就有所不同，且对图4而言，例如在第一、第二触控感应电极上接收到的信号强度V1和V2满足V2<V1。在进行触摸调试的时候，要分别对这两部分的触摸信号(主要是触摸信号幅值)进行调试。在调试时，触摸驱动电极(TX)上加载的第一、第二触摸驱动信号的信号强度一般在公共电压VCOM～工作电压VDD之间(IC所能提供的最大范围)，然后根据实际触摸反馈进行调试，以能够保证正反两面触控时都能有很好的触控效果为准。在调试完成后即确认了正反触摸驱动信号的大小，换言之，也就是完成了第一、第二触摸驱动信号的信号强度的设定。关于电容的公式(1)中，C为两层电极之间的电容值，ε为两层电极之间的介电常数，S为两层电极之间的重叠面积，d为两层电极之间的间距。
在本发明至少一实施例中，上述第一触控感应电极12与第二触控感应电极13可共用同一电极，即只存在一种感应电极，只是在触摸检测阶段分时扫描，第一时段检测第一感应面(正面)的触控，第二时段检测第二感应面(反面)的触控。进一步地，上述共用的感应电极还可与触控驱动电极同层设置。
如图6和图7所示，本发明实施例提供的另一种双面触控的显示装置中，公共电极层和触摸层同层设置(如图6中的19所示)。如图7所示：将公共电极层图形化，公共电极层包括：以彼此绝缘的方式同层设置的第一感应电 极20和触控驱动电极11，第一感应电极20和触控驱动电极11均采用透明导电材料23制成，第一感应电极20和触控驱动电极11之间通过绝缘材料22隔开，触控驱动电极11的各部分通过透明搭桥21相互连接。具体工作时：在触控驱动电极11在显示阶段加载公共电压，充当公共电极使用；在第一触摸检测阶段触摸驱动电极11加载第一触摸驱动信号，第一感应电极20与之相互配合，进行第一感应面触控信号扫描；在第二触摸检测阶段触摸驱动电极11加载第二触摸驱动信号，第一感应电极20与之相互配合，进行第二感应面200触控信号扫描。
综上，公共电极层图形化，与触控驱动电极(TX)/第一感应电极(RX)共用，公共电极层同时充当检测正反面触控信号触摸层，可以实现在不增加透明显示屏的厚度以及降低透过率的情况下实现显示装置的两面触控。
本发明至少一实施例还提供一种双面触控的显示装置，其包括上述任意一种显示面板。所述显示装置在触摸检测阶段再分时进行正面和背面的触摸检测，从而实现显示装置的两面触控，可减少屏幕视线遮挡，提高操控效率；并且，不同的时间内进行不同信号扫描，可以避免不同信号之间的串扰及影响，从而可获得更高的显示品质。
所述显示装置可以为：液晶面板、电子纸、OLED面板、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪、手表等任何具有显示功能的产品或部件。
为了便于清楚说明，在本发明中采用了第一、第二等字样对相似项进行类别区分，该第一、第二字样并不在数量上对本发明的保护范围进行限制，只是对一种优选的方式的举例说明，本领域技术人员根据本发明公开的内容，想到的显而易见的相似变形或相关扩展均属于本发明的保护范围内。
本说明书中的各个实施例均采用递进的方式描述，各个实施例之间相同相似的部分互相参见即可，每个实施例重点说明的都是与其他实施例的不同之处。尤其，对于设备实施例而言，由于其基本相似于方法实施例，所以描述得比较简单，相关之处参见方法实施例的部分说明即可。
需要说明的是，本发明实施例中的各技术特征在不冲突的前提下，可任意组合使用。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流 程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)或随机存储记忆体(Random Access Memory，RAM)等。
以上所述仅是本发明的示范性实施方式，而非用于限制本发明的保护范围，本发明的保护范围由所附的权利要求确定。
本申请要求于2014年6月19日递交的中国专利申请第201410277136.7号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。

Claims (11)

  1. 一种驱动方法，适用于双面触控的显示装置，所述显示装置包括触控驱动电极和公共电极，一帧图像的显示扫描时间包含显示驱动时段、第一触控驱动时段、第二触控驱动时段；该驱动方法包括：
    在显示驱动时段向所述公共电极加载用于显示的公共电压信号；
    在第一触控驱动时段向所述触摸驱动电极加载第一触摸驱动信号，进行所述显示装置的第一感应面触控信号扫描；
    在第二触控驱动时段向所述触摸驱动电极加载第二触摸驱动信号，进行所述显示装置的第二感应面触控信号扫描。
  2. 根据权利要求1所述的驱动方法，其中，所述触控驱动电极和所述公共电极共用同一电极。
  3. 根据权利要求1或2所述的驱动方法，其中，所述一帧图像的显示扫描时间还包括噪声扫描时段，所述驱动方法还包括：
    在噪声扫描时段，向所述触摸驱动电极加载用于消除噪声的噪声扫描信号。
  4. 根据权利要求1-3任一项所述的驱动方法，其中，所述显示驱动时段、所述第一触控驱动时段、所述第二触控驱动时段互不重叠。
  5. 根据权利要求1-4任一项所述的驱动方法，其中，所述第一触摸驱动信号和所述第二触摸驱动信号为振幅不同的脉冲信号。
  6. 一种双面触控的显示面板，包括：
    相对设置的第一基板和第二基板；
    触控驱动电极，用于加载第一触摸驱动信号或者第二触摸驱动信号；
    第一触控感应电极，用于接收由所述第一基板或第二基板的触碰动作所引起的反馈信号；
    公共电极，用于接收公共电极信号；
    其中，所述触控驱动电极和所述公共电极位于第一基板和第二基板之间，所述触控驱动电极与所述第一触控感应电极彼此绝缘设置。
  7. 根据权利要求6所述的显示面板，还包括：第二触控感应电极，所述第二触控感应电极与所述触控驱动电极绝缘设置；
    其中，当第一触控感应电极用于接收所述第一基板和第二基板中一个的触碰动作所引起的反馈信号时，所述第二触控感应电极用于接收所述第一基板和第二基板中另一个的触碰动作所引起的反馈信号。
  8. 根据权利要求6或7所述的显示面板，其中，所述触控驱动电极和所述公共电极共用同一电极。
  9. 根据权利要求8所述的显示面板，其中，所述触控驱动电极、公共电极和所述第一触控感应电极位于同一层。
  10. 根据权利要求7所述的显示面板，其中，所述第一触控感应电极设置在第一基板上，所述第二触控驱动电极设置在第二基板上，所述触控驱动电极设置在第一触控感应电极和所述第二触控感应电极之间。
  11. 一种双面触控的显示装置，包括权利要求6-10任一项所述的显示面板。
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