技术领域technical field
本发明涉及触控面板技术领域，尤指利用自电容与互电容感应交替扫瞄以去除触控噪声的方法。The invention relates to the technical field of touch panels, in particular to a method for removing touch noise by using self-capacitance and mutual-capacitance sensing to scan alternately.
背景技术Background technique
触控面板的技术原理是当手指或其他介质接触到屏幕时，依据不同感应方式，侦测电压、电流、声波或红外线等，进而测出触压点的坐标位置。例如电阻式触控面板即为利用上、下电极间的电位差，以在施压点位置进行计算进而检测出触碰点所在。电容式触控面板是利用排列的透明电极与人体之间的静电结合所产生的电容变化，从所产生的电流或电压来检测其坐标。The technical principle of the touch panel is that when a finger or other medium touches the screen, it detects voltage, current, sound waves or infrared rays according to different sensing methods, and then measures the coordinate position of the touch point. For example, the resistive touch panel uses the potential difference between the upper and lower electrodes to calculate the position of the pressure point and then detect the location of the touch point. The capacitive touch panel uses the capacitance change generated by the electrostatic combination between the arranged transparent electrodes and the human body, and detects its coordinates from the generated current or voltage.
现有的电容式触控系统在计算坐标时，必须经由感测电路量测触控面板上电容值的变化得到触控位置等信息，以计算用户触摸位置坐标。然而在取得触控数据的过程中，极可能因为电容感测电路、触控面板单元乃至驱动电路端受到噪声干扰、外部噪声对地干扰以及面板或集成电路内部所产生的噪声干扰使得触控数据产生失真飘移，造成图1中所示的杂点出现的情形或使真实触碰点消失或坐标偏移。When the existing capacitive touch system calculates the coordinates, it must measure the change of the capacitance value on the touch panel through the sensing circuit to obtain information such as the touch position, so as to calculate the coordinates of the user's touch position. However, in the process of obtaining touch data, it is very likely that the capacitive sensing circuit, touch panel unit and even the drive circuit are subject to noise interference, external noise interference to ground, and noise interference generated inside the panel or integrated circuit. Distortion drift is generated, resulting in the occurrence of noise points shown in Figure 1 or the disappearance of real touch points or coordinate shifts.
现有的投射式电容触控感测(ProjectedCapacitive)技术又可分为自感电容型(Selfcapacitance)和互感电容型(Mutualcapacitance)。自感电容型是指触控物与导体线间产生电容耦合，并量测导体线的电容变化，以确定触碰发生。而互感电容型则是当触碰发生时，会在邻近两层导体线间产生电容耦合现象。The existing projected capacitive touch sensing (Projected Capacitive) technology can be further divided into self-capacitance (Selfcapacitance) and mutual capacitance (Mutualcapacitance). The self-capacitance type refers to the capacitive coupling between the touch object and the conductor line, and the capacitance change of the conductor line is measured to determine the touch occurrence. The mutual inductance capacitance type is that when a touch occurs, a capacitive coupling phenomenon will be generated between two adjacent conductor lines.
现有的自感电容感测技术是感测每一条导体线对地电容，藉由对地电容值变化判断是否有物体靠近电容式触控面板，其中，自感电容或对地电容并非实体电容，其为每一条导体线的寄生电容及杂散电容。The existing self-inductance capacitance sensing technology is to sense the ground capacitance of each conductor line, and judge whether there is an object approaching the capacitive touch panel by the change of the ground capacitance value, wherein the self-inductance capacitance or the ground capacitance is not a physical capacitance , which are the parasitic capacitance and stray capacitance of each conductor line.
现有的互感电容型感测技术是感测互感应电容(mutualcapacitance，Cm)的大小变化，以判断是否有物体靠近触控面板，同样地，互感应电容并非实体电容，其是驱动导体线与感测导体线之间的互感应电容。The existing mutual capacitance sensing technology is to sense the change of the mutual capacitance (mutual capacitance, Cm) to determine whether there is an object close to the touch panel. Sensing mutual inductive capacitance between conductor lines.
自感电容感测技术容易产生鬼点，但是自感电容感测技术在相对位置上还是可以侦测出正确的位置。图2为自感电容感测技术的假点的示意图。The self-capacitive sensing technology is prone to ghost points, but the self-capacitive sensing technology can still detect the correct position in the relative position. FIG. 2 is a schematic diagram of a false point of self-inductance capacitive sensing technology.
虽然自感电容感测技术会产生两个假点，但是X、Y轴上的触碰点还是可以表示出来。即，虽然无法分辨出哪两点是真实的触碰点，但至少只需要去分辨图2中四点之中哪两点是触碰点即可。Although self-capacitance sensing technology will produce two false points, the touch points on the X and Y axes can still be represented. That is, although it is impossible to distinguish which two points are real touch points, at least it is only necessary to distinguish which two points among the four points in FIG. 2 are touch points.
而互感电容型感测技术则使用不同时间打出的驱动信号，可以简单的侦测到两点的正确位置。图3为互感电容型感测技术的示意图。由图3可看出驱动信号是在不同的时间输出，也因为如此可以经由时间差，找出各触碰点的正确位置。The mutual-inductance-capacitance sensing technology uses driving signals issued at different times to easily detect the correct positions of two points. FIG. 3 is a schematic diagram of mutual capacitance sensing technology. It can be seen from FIG. 3 that the driving signals are output at different times, and because of this, the correct position of each touch point can be found through the time difference.
然而当有外来噪声或是电路及面板接收到噪声时，可发现互感电容型感测技术在同一条感测线上容易受到噪声的干扰。其原因为当触控系统连接至真实的大地接地系统时，由于触控介质(例如：使用者的手指)也是连接至真实的大地接地系统，故此时触控系统可以稳定且正确地的输出触碰点的坐标。但是当将触控系统改为独立电源，该独立电源的接地与真实的大地接地系统有所差异，此时就可以发现触碰点的坐标有晃动很大的现象或是有其他的杂点产生，如图4所示，这对触控系统的稳定度来说有不利的影响。However, when there is external noise or noise is received by the circuit and the panel, it can be found that the mutual inductance capacitive sensing technology is easily disturbed by the noise on the same sensing line. The reason is that when the touch system is connected to the real earth ground system, since the touch medium (for example: the user's finger) is also connected to the real earth ground system, the touch system can output the touch signal stably and correctly at this time. The coordinates of the touch point. But when the touch system is changed to an independent power supply, the grounding of the independent power supply is different from the real earth grounding system. At this time, it can be found that the coordinates of the touch point shake a lot or there are other noises. , as shown in FIG. 4 , which has an adverse effect on the stability of the touch system.
图5为互感电容型感测技术的模型示意图。电容Cd代表驱动导体线上的寄生及杂散电容，电容Cs代表感测导体线上的寄生及杂散电容，电容Cm代表驱动导体线与感测导体线之间互感应电容，电容Cf2代表手指触碰时的电容。FIG. 5 is a schematic diagram of a model of mutual capacitance sensing technology. The capacitance Cd represents the parasitic and stray capacitance on the driving conductor line, the capacitance Cs represents the parasitic and stray capacitance on the sensing conductor line, the capacitance Cm represents the mutual induction capacitance between the driving conductor line and the sensing conductor line, and the capacitance Cf2 represents the finger Capacitance when touched.
如图5所示，依据电容Cm变化量来判断面板是否被手指触碰。由于电容Cm为互感应电容，故其为一个极小的电容，其电容值约0.7pF左右，因此当驱动导体线D1输入驱动信号时，电容Cm反而成为一个大阻抗。当手指触摸时，噪声由手指传入。对积分器而言，驱动信号的振幅由于电容Cm缘故，相对较小，因此积分器的输出信号受噪声影响就大。As shown in FIG. 5 , it is judged whether the panel is touched by a finger according to the variation of the capacitance Cm. Since the capacitor Cm is a mutual induction capacitor, it is an extremely small capacitor with a capacitance value of about 0.7pF. Therefore, when the driving conductor line D1 inputs a driving signal, the capacitor Cm becomes a large impedance instead. When a finger touches, noise is introduced by the finger. For the integrator, the amplitude of the drive signal is relatively small due to the capacitance Cm, so the output signal of the integrator is greatly affected by noise.
图6为自感电容感测技术的模型示意图。电容Cf代表手指触碰时的电容，电容Cx代表导体线对地的电容。电容Cx为导体线对地的电容，远比电容Cm大，故驱动信号是对一个大电容Cx充放电，噪声影响相对比互感电容型感测技术较小。FIG. 6 is a schematic diagram of a model of self-capacitance sensing technology. Capacitance Cf represents the capacitance when the finger touches, and capacitance Cx represents the capacitance of the conductor line to ground. Capacitor Cx is the capacitance of the conductor line to ground, which is much larger than capacitor Cm, so the driving signal is to charge and discharge a large capacitor Cx, and the noise impact is relatively smaller than that of mutual capacitance sensing technology.
为了改善上述影响互电容输出结果，使得噪声影响变小并且坐标稳定输出，现有方法使用滤波电路以滤除不属于驱动信号的外来噪声。通常滤波电路会加在积分器前后，如图7所示。滤波电路可以是低通、高通、带通或是带拒等有滤波效果的抗噪声电路。In order to improve the above-mentioned mutual-capacitance-affecting output results, so that noise influence is reduced and the coordinate output is stable, the existing method uses a filter circuit to filter out extraneous noise that does not belong to the driving signal. Usually filter circuits will be added before and after the integrator, as shown in Figure 7. The filter circuit can be an anti-noise circuit with a filter effect such as low pass, high pass, band pass or band rejection.
滤波电路可以是电阻和电容的组合，即被动式滤波电路。被动式滤波电路在不复杂的电路系统下往往可以得到很好的效果。但是将被动式滤波电路应用在触控系统时，因为触控电路依各家厂商的设计不同，而有不同的解决方法。然而同样的困难点在于微小的电容变化量以及相对一般电路下较小的输入电压。这两种条件对于抗噪声来说就是不利的因素。滤波电路对于一些可预期或是影响不大的噪声率是可以发挥很好的效果，然而对容易受到干扰的微小信号量电路来说，些微的噪声影响就可能造成数据判断错误，甚至将原本的微弱信号给滤除掉，所以滤波电路对触控电路来说也是有其缺点存在。The filter circuit can be a combination of resistors and capacitors, that is, a passive filter circuit. Passive filter circuits can often achieve good results with uncomplicated circuit systems. However, when the passive filter circuit is applied to the touch system, there are different solutions for the touch circuit depending on the design of each manufacturer. However, the same difficulty lies in the small capacitance change and the relatively small input voltage under the general circuit. These two conditions are unfavorable factors for anti-noise. The filter circuit can play a very good effect on some predictable or little-affected noise rates. However, for small signal volume circuits that are susceptible to interference, slight noise effects may cause data judgment errors, and even the original Weak signals are filtered out, so the filter circuit also has its disadvantages for the touch circuit.
针对上述问题，也有触控集成电路的设计厂商将驱动信号的电压加大，用以应付噪声的干扰。但是相对而言，此会增加功率消耗，并不是很适合于手持式装置。同时，在积分电路前就已受到噪声影响的电路，即使将驱动信号的电压加大，也难以消除噪声的影响。In view of the above problems, some design manufacturers of touch integrated circuits increase the voltage of the driving signal to cope with the interference of noise. But relatively speaking, this will increase power consumption, which is not very suitable for handheld devices. At the same time, even if the voltage of the driving signal is increased, it is difficult to eliminate the influence of noise on a circuit that has been affected by noise before the integration circuit.
另一种现有方法是将判断是否有触碰点产生的门限值予以调整。图8为一调整噪声门限值的示意图。电容触控系统通过使用电容的微量变化来侦测是否有触碰点产生，为避免噪声干扰而产生误判的触碰点，其中一种方法是调整噪声门限值(NoiseThreshold)。此种方法可以随着环境变化，将噪声门限值调高或调低，以符合当时环境的影响。如图8所示，在设计A中，噪声门限值较低，然而在设计B中，则将噪声门限值调高。Another existing method is to adjust the threshold value for judging whether there is a touch point. FIG. 8 is a schematic diagram of adjusting the noise threshold. The capacitive touch system detects whether there is a touch point by using a small change in capacitance. In order to avoid falsely judged touch points due to noise interference, one method is to adjust the noise threshold (NoiseThreshold). This method can increase or decrease the noise threshold as the environment changes, so as to conform to the influence of the environment at that time. As shown in Figure 8, in Design A, the noise threshold is lower, while in Design B, the noise threshold is adjusted higher.
然而要做到可调变的噪声门限值却不是那么容易，因为触控集成电路内部并不清楚噪声来源为何，而且必须设定在哪些情况下必须调整噪声门限值，这代表着必须使系统重新初始化，将参数做调整才能得到最好的噪声门限值，这种情况下需要耗费相当多的系统资源。However, it is not so easy to achieve an adjustable noise threshold, because the source of the noise is not clear inside the touch IC, and the circumstances under which the noise threshold must be adjusted must be set, which means that the noise threshold must be adjusted. Re-initialize the system and adjust the parameters to get the best noise threshold value. In this case, a lot of system resources will be consumed.
美国专利第7919367号公告中，采取了一种变频驱动的方式来避开不同频带噪声干扰。如图9A、图9B所示，其使用三个频率不同的驱动信号来扫描触控面板。对大部份的噪声而言，这是一个很好的避开噪声的方法，而且有三种频率的数据做比较，对于后续的坐标处理，可以提升触碰点坐标的准确度。然而，因为噪声来源不明，此方法无法完全避开可能碰到噪声的频率，同时由于使用三个频率不同的驱动信号，其无可避免的必须耗费较多系统资源、降低触碰点的侦测频率(ReportRate)、以及耗电的问题。因此，现有电容式触控面板的感测技术实仍有改善的空间。In the announcement of US Patent No. 7919367, a variable frequency drive method is adopted to avoid noise interference in different frequency bands. As shown in FIG. 9A and FIG. 9B , it uses three driving signals with different frequencies to scan the touch panel. For most noises, this is a good way to avoid noise, and there are three frequency data for comparison, which can improve the accuracy of the touch point coordinates for subsequent coordinate processing. However, because the source of the noise is unknown, this method cannot completely avoid the frequencies that may encounter noise. At the same time, since three driving signals with different frequencies are used, it inevitably consumes more system resources and reduces the detection of touch points. Frequency (ReportRate), and power consumption issues. Therefore, there is still room for improvement in the sensing technology of the existing capacitive touch panel.
发明内容Contents of the invention
本发明的目的主要是提供一种利用自电容与互电容感应交替扫瞄以去除触控噪声的方法，以降低噪声对触碰位置的影响，并提升触碰位置的准确度，可应用于手持式装置中。The purpose of the present invention is mainly to provide a method for removing touch noise by using self-capacitance and mutual-capacitance sensing to scan alternately, so as to reduce the influence of noise on the touch position and improve the accuracy of the touch position, which can be applied to handheld in the device.
本发明提出一种利用自电容与互电容感应交替扫瞄以去除触控噪声的方法，其用于一电容式多点触控系统，所述电容式多点触控系统包含一电容式触控面板、一第一驱动感测装置、一第二驱动感测装置和一控制装置，所述第一驱动感测装置和第二驱动感测装置分别具有一第一工作模式和一第二工作模式，其中，当所述第一驱动感测装置和第二驱动感测装置在所述第一工作模式时，执行自感电容驱动感测，以及当所述第一驱动感测装置和第二驱动感测装置在所述第二工作模式时，执行互感电容驱动感测，所述方法包含下列步骤：步骤A、所述控制装置对所述第一驱动感测装置和第二驱动感测装置执行初始化；步骤B、设定所述第一驱动感测装置和/或第二驱动感测装置为所述第一工作模式，以对所述电容式触控面板进行至少一次自感电容驱动感测，以找出一第一可能触控范围，并将所述第一可能触控范围储存于该存储单元中；步骤C、设定所述第一驱动感测装置和第二驱动感测装置为所述第二工作模式，以对所述电容式触控面板进行至少一次互感电容驱动感测，以找出一第二可能触控范围，并将所述第二可能触控范围储存于该存储单元中；步骤D、判断所述第二可能触控范围与所述第一可能触控范围是否有交集；以及步骤E、若有，则产生一可能触控范围交集，并依据所述可能触控范围交集计算触碰点的坐标。The present invention proposes a method for removing touch noise by using self-capacitance and mutual-capacitance sensing to scan alternately, which is used in a capacitive multi-touch system, and the capacitive multi-touch system includes a capacitive touch Panel, a first driving sensing device, a second driving sensing device and a control device, the first driving sensing device and the second driving sensing device have a first working mode and a second working mode respectively , wherein, when the first drive sensing means and the second drive sensing means are in the first operating mode, self-capacitance drive sensing is performed, and when the first drive sensing means and the second drive sensing means When the sensing device is in the second working mode, it performs mutual inductance capacitance driving sensing, and the method includes the following steps: Step A, the control device executes on the first driving sensing device and the second driving sensing device Initialization; step B, setting the first driving sensing device and/or the second driving sensing device to the first working mode, so as to perform at least one self-inductance capacitive driving sensing on the capacitive touch panel , to find a first possible touch range, and store the first possible touch range in the storage unit; Step C, setting the first drive sensing device and the second drive sensing device as The second working mode is to perform at least one mutual inductance capacitive driving sensing on the capacitive touch panel to find a second possible touch range, and store the second possible touch range in the memory In the unit; step D, judging whether the second possible touch range intersects with the first possible touch range; and step E, if yes, generating a possible touch range intersection, and according to the possible touch Calculate the coordinates of the touch point through the intersection of control ranges.
本发明还提出另一利用自电容与互电容感应交替扫瞄以去除触控噪声的方法，用于一电容式多点触控系统，所述电容式多点触控系统包含一电容式触控面板、一第一驱动感测装置、一第二驱动感测装置和一控制装置，所述第一驱动感测装置和第二驱动感测装置分别具有一第一工作模式和一第二工作模式，其中，当所述第一驱动感测装置和第二驱动感测装置在所述第一工作模式时，执行一自感电容驱动感测，以及当所述第一驱动感测装置和第二驱动感测装置在所述第二工作模式时，执行一互感电容驱动感测，所述方法包含下列步骤：步骤A、所述控制装置对所述第一驱动感测装置和第二驱动感测装置执行一初始化；步骤B、设定所述第一驱动感测装置和第二驱动感测装置为所述第二工作模式，以对该电容式触控面板进行所述互感电容驱动感测，以找出一第一可能触控范围，并将所述第一可能触控范围储存于所述存储单元中；步骤C、设定所述第一驱动感测装置和/或第二驱动感测装置为所述第一工作模式，以对所述电容式触控面板进行所述自感电容驱动感测，以找出一第二可能触控范围，并将所述第二可能触控范围储存于所述存储单元中；步骤D、判断所述第二可能触控范围和第一可能触控范围是否有交集；步骤E、若有，则产生一可能触控范围交集，并依据所述可能触控范围交集计算触碰点的坐标。The present invention also proposes another method for removing touch noise by using self-capacitance and mutual-capacitance sensing to scan alternately, which is used in a capacitive multi-touch system, and the capacitive multi-touch system includes a capacitive touch Panel, a first driving sensing device, a second driving sensing device and a control device, the first driving sensing device and the second driving sensing device have a first working mode and a second working mode respectively , wherein, when the first driving sensing means and the second driving sensing means are in the first working mode, a self-inductance capacitive driving sensing is performed, and when the first driving sensing means and the second driving sensing means When the drive sensing device is in the second working mode, it performs a mutual inductance capacitance drive sensing, and the method includes the following steps: Step A, the control device senses the first drive sense device and the second drive sense device The device performs an initialization; step B, setting the first driving sensing device and the second driving sensing device to the second working mode, so as to perform the mutual capacitance driving sensing on the capacitive touch panel, to find a first possible touch range, and store the first possible touch range in the storage unit; step C, setting the first drive sensing device and/or the second drive sensing device The device is in the first working mode, so as to perform the self-inductance capacitive driving sensing on the capacitive touch panel to find a second possible touch range, and store the second possible touch range In the storage unit; step D, judging whether the second possible touch range overlaps with the first possible touch range; step E, if yes, generating a possible touch range intersection, and according to the possible The touch range intersection calculates the coordinates of the touch point.
由前述说明可知，单独使用互感电容型感测技术可能会产生许多杂点，甚至会使原本的触碰点消失。因此本发明整合自感电容驱动感测和互感电容型感测技术，将坐标数据进行相互比对，即先将可能的触控位置经由自容式侦测出来(包含鬼点)，再与互容式触控技术侦测触控面板，比对两者数据共同性，以判断出没有受噪声影响的数据，进而输出真实坐标。此方法可以减少滤波电路的使用与设计，因此能以较少的系统资源得到正确且稳定的坐标输出。It can be known from the foregoing description that using the mutual inductance capacitance sensing technology alone may generate many noise points, and even make the original touch points disappear. Therefore, the present invention integrates self-capacitance-driven sensing and mutual-inductance-capacitance sensing technology, and compares the coordinate data with each other, that is, first detects possible touch positions (including ghost points) through self-capacitance, and then compares the coordinate data with each other. Capacitive touch technology detects the touch panel, compares the data commonality between the two to determine the data that is not affected by noise, and then outputs the real coordinates. This method can reduce the use and design of filter circuits, so that correct and stable coordinate output can be obtained with less system resources.
而本发明使用自电容触控技术，具有在驱动或感测线上不易受噪声干扰的特性，先使用自电容标记出合理的触控发生范围，辅以互电容触控技术能正确找出触碰点的特性，进而达成滤除噪声的目的。However, the present invention uses self-capacitance touch technology, which has the characteristics that the driving or sensing line is not easily disturbed by noise. The characteristics of the touch point, and then achieve the purpose of filtering noise.
附图说明Description of drawings
图1为一现有电容式触控系统杂点的示意图；FIG. 1 is a schematic diagram of noise points in a conventional capacitive touch control system;
图2为一现有自感电容感测技术的假点的示意图；FIG. 2 is a schematic diagram of a false point of an existing self-inductance capacitive sensing technology;
图3为一现有互感电容型感测技术的示意图；3 is a schematic diagram of an existing mutual capacitance sensing technology;
图4为一现有互感电容型感测技术受噪声影响的示意图；FIG. 4 is a schematic diagram of a conventional mutual-inductance-capacitance sensing technology affected by noise;
图5为一现有互感电容型感测技术的模型示意图；5 is a schematic diagram of a model of an existing mutual capacitance sensing technology;
图6为一现有自感电容感测技术的模型示意图；6 is a schematic diagram of a model of an existing self-inductance capacitive sensing technology;
图7为一现有电容式触控系统使用滤波电路的示意图；7 is a schematic diagram of a filter circuit used in an existing capacitive touch system;
图8为一现有调整噪声门限值的示意图；FIG. 8 is a schematic diagram of an existing adjusted noise threshold;
图9A为一现有使用三个频率不同的驱动信号来扫描触控面板的电路示意图；FIG. 9A is a schematic diagram of a conventional circuit using three driving signals with different frequencies to scan a touch panel;
图9B为该现有使用三个频率不同的驱动信号来扫描触控面板的时钟示意图；FIG. 9B is a schematic diagram of the existing clocks using three driving signals with different frequencies to scan the touch panel;
图10为本发明应用于一电容式多点触控系统的方块图；10 is a block diagram of the present invention applied to a capacitive multi-touch system;
图11为本发明一种利用自电容与互电容感应交替扫瞄以去除触控噪声的方法的流程图；FIG. 11 is a flow chart of a method for removing touch noise by using self-capacitance and mutual-capacitance sensing to alternately scan in accordance with the present invention;
图12为本发明使用自感电容驱动感测的示意图；FIG. 12 is a schematic diagram of the present invention using self-inductance capacitance to drive and sense;
图13为本发明使用互感电容型感测的示意图；13 is a schematic diagram of the present invention using mutual capacitance sensing;
图14为本发明产生一可能触控范围交集的示意图；FIG. 14 is a schematic diagram of the intersection of possible touch ranges generated by the present invention;
图15为本发明产生一可能触控范围交集的另一示意图；FIG. 15 is another schematic diagram of the intersection of possible touch ranges generated by the present invention;
图16为本发明一应用的示意图。Figure 16 is a schematic diagram of an application of the present invention.
附图中，各标号所代表的名称如下：In the accompanying drawings, the names represented by each label are as follows:
100、电容式多点触控系统，110、电容式触控面板，120、第一驱动感测装置，130、第二驱动感测装置，140、控制装置，112、第一导体线，111、第二导体线，141、存储单元100. Capacitive multi-touch system, 110. Capacitive touch panel, 120. First driving sensing device, 130. Second driving sensing device, 140. Control device, 112. First conductor line, 111. Second conductor line, 141, storage unit
具体实施方式detailed description
为了使本发明的目的、技术方案及优点更加清楚明白，以下参照附图并举实施例，对本发明作进一步详细说明。In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and examples.
本发明为一种利用自电容与互电容感应交替扫瞄以去除触控噪声的方法，用于一电容式多点触控系统中，图10为该电容式多点触控系统100的方块图，图11为本发明的利用自电容与互电容感应交替扫瞄以去除触控噪声的方法的流程图。如图10所示，该电容式多点触控系统100包含一电容式触控面板110、一第一驱动感测装置120、一第二驱动感测装置130和一控制装置140。The present invention is a method for removing touch noise by using self-capacitance and mutual-capacitance sensing to scan alternately, which is used in a capacitive multi-touch system. FIG. 10 is a block diagram of the capacitive multi-touch system 100 , FIG. 11 is a flowchart of a method for removing touch noise by using self-capacitance and mutual-capacitance sensing to scan alternately in the present invention. As shown in FIG. 10 , the capacitive multi-touch system 100 includes a capacitive touch panel 110 , a first driving sensing device 120 , a second driving sensing device 130 and a control device 140 .
所述电容式触控面板110具有于第一方向(X方向)分布的m条第一导体线112以及于第二方向(Y方向)分布的n条第二导体线111，其中，m、n为大于1的整数，第一方向及第二方向互相垂直。The capacitive touch panel 110 has m first conductor lines 112 distributed in the first direction (X direction) and n second conductor lines 111 distributed in the second direction (Y direction), wherein m, n is an integer greater than 1, and the first direction and the second direction are perpendicular to each other.
所述第一驱动感测装置120和第二驱动感测装置130分别具有一第一工作模式和一第二工作模式。当所述第一驱动感测装置120和第二驱动感测装置130在所述第一工作模式时，执行自感电容驱动感测，以及当所述第一驱动感测装置120和第二驱动感测装置130在所述第二工作模式时，则执行互感电容驱动感测。所述控制装置140具有一存储单元141。The first driving sensing device 120 and the second driving sensing device 130 respectively have a first working mode and a second working mode. When the first driving sensing device 120 and the second driving sensing device 130 are in the first working mode, self-capacitance driving sensing is performed, and when the first driving sensing device 120 and the second driving sensing device 120 and the second driving sensing device When the sensing device 130 is in the second working mode, it performs mutual capacitance driving sensing. The control device 140 has a storage unit 141 .
参照图11所示的流程图，首先于步骤A中，所述控制装置140对所述第一驱动感测装置120和第二驱动感测装置130执行初始化。Referring to the flow chart shown in FIG. 11 , firstly in step A, the control device 140 initializes the first driving sensing device 120 and the second driving sensing device 130 .
于步骤B中，所述控制装置140分别设定所述第一驱动感测装置120和/或第二驱动感测装置130为所述第一工作模式，以对所述电容式触控面板110进行至少一次自感电容驱动感测，进而找出一第一可能触控范围，并将所述第一可能触控范围储存于所述存储单元141中。图12为本发明使用自感电容驱动感测的示意图。In step B, the control device 140 respectively sets the first driving sensing device 120 and/or the second driving sensing device 130 to the first working mode, so as to control the capacitive touch panel 110 At least one self-capacitive driving sensing is performed to find a first possible touch range, and the first possible touch range is stored in the storage unit 141 . FIG. 12 is a schematic diagram of the present invention using self-inductance capacitance to drive and sense.
进一步地，步骤B使用自感电容驱动感测来侦测所述电容式触控面板110上的触碰范围。步骤B可以使用至少一次平均的结果或是至少一次的有效结果来当作触控范围数据。使用自感电容驱动感测可以在实施互感电容型感测技术之前、之后或各个不同流程顺序中，有助于排除杂点而保留真实触控点。Further, in step B, the touch range on the capacitive touch panel 110 is detected by using self-inductance capacitive driving sensing. In step B, at least one averaged result or at least one valid result may be used as the touch range data. The use of self-capacitance driven sensing can help to eliminate noise points and retain real touch points before, after, or in various process sequences implementing mutual-inductance-capacitance-based sensing techniques.
步骤B为进行至少一次自感电容驱动感测，以产生一自感电容影像未处理数据，所述控制装置140依据所述自感电容影像未处理数据是否大于一第一门限值Th1，以找出所述第一可能触控范围。当所述自感电容影像未处理数据大于所述第一门限值Th1时，所述控制装置140判定该处为触碰点，藉此找出所述第一可能触控范围。由于使用自感电容驱动感测，故所述自感电容影像未处理数据的数据量为m+n笔数据，其中，m和n为大于1的整数。Step B is to perform at least one self-inductance capacitance driving and sensing to generate a self-inductance capacitance image unprocessed data, and the control device 140 determines whether the self-inductance capacitance image unprocessed data is greater than a first threshold value Th1, to Find out the first possible touch range. When the self-capacitance image unprocessed data is greater than the first threshold value Th1, the control device 140 determines that the location is a touch point, so as to find out the first possible touch range. Since the self-inductance capacitance is used for driving and sensing, the data volume of the unprocessed data of the self-inductance capacitance image is m+n pieces of data, wherein m and n are integers greater than 1.
如图12所示，该第一可能触控范围可为{(D6,S4)、(D6,S5)、(D6,S6)、(D7,S4)、(D7,S5)、(D7,S6)、(D8,S4)、(D8,S5)、(D8,S6)}。As shown in Figure 12, the first possible touch range can be {(D6, S4), (D6, S5), (D6, S6), (D7, S4), (D7, S5), (D7, S6 ), (D8, S4), (D8, S5), (D8, S6)}.
于步骤C中，所述控制装置140设定所述第一驱动感测装置120和第二驱动感测装置130为所述第二工作模式，以对所述电容式触控面板110进行至少一次互感电容驱动感测，进而找出一第二可能触控范围，并将所述第二可能触控范围储存于所述存储单元141中。图13为本发明使用互感电容型感测的示意图。In step C, the control device 140 sets the first driving sensing device 120 and the second driving sensing device 130 to the second working mode, so as to perform at least one operation on the capacitive touch panel 110 The mutual inductance capacitance drives the sensing, and then finds out a second possible touch range, and stores the second possible touch range in the storage unit 141 . FIG. 13 is a schematic diagram of the present invention using mutual capacitance sensing.
进一步地，步骤C使用互感电容型感测技术来侦测所述电容式触控面板110上可能产生的触控点的合理位置，也可使用至少一次平均的结果或是至少一次的有效结果当作触控点数据，互电容触控技术可以实施在自电容触控技术之前、之后或各个不同流程顺序中，有助于接下来的坐标输出的流程点实施。Further, in step C, a mutual inductance capacitive sensing technology is used to detect a reasonable position of a touch point that may be generated on the capacitive touch panel 110, and at least one averaged result or at least one valid result may also be used when For touch point data, the mutual capacitance touch technology can be implemented before, after or in different process sequences of the self-capacitance touch technology, which is helpful for the implementation of the next coordinate output process point.
于步骤C中，进行至少一次互感电容驱动感测，以产生一互感电容影像未处理数据，所述控制装置140依据所述互感电容影像未处理数据是否大于一第二门限值Th2，以找出所述第二可能触控范围。当所述互感电容影像未处理数据中大于所述第二门限值Th2时，所述控制装置140判定该处为有触碰点，藉此找出所述第二可能触控范围。由于使用互感电容驱动感测，故所述互感电容影像未处理数据的数据量为m×n笔数据，m和n均为大于1的整数。第一门限值和第二门限值都是本领域技术人员根据经验取得。In step C, at least one mutual capacitance driving sensing is performed to generate unprocessed data of a mutual capacitance image, and the control device 140 finds according to whether the unprocessed data of the mutual capacitance image is greater than a second threshold value Th2. out of the second possible touch range. When the unprocessed data of the mutual inductance capacitance image is greater than the second threshold value Th2, the control device 140 determines that there is a touch point, so as to find out the second possible touch range. Since mutual capacitance is used to drive and sense, the data volume of the unprocessed data of the mutual capacitance image is m×n pieces of data, and both m and n are integers greater than 1. Both the first threshold and the second threshold are obtained by those skilled in the art based on experience.
如图13所示，该第二可能触控范围可为{(D3,S5)、(D7,S4)、(D7,S5)、(D8,S4)、(D8,S5)、(D8,S6)}。As shown in Figure 13, the second possible touch range can be {(D3, S5), (D7, S4), (D7, S5), (D8, S4), (D8, S5), (D8, S6 )}.
于步骤D中，判断所述第二可能触控范围与所述第一可能触控范围是否有交集。In step D, it is determined whether the second possible touch range overlaps with the first possible touch range.
于步骤D中，计算所述第一可能触控范围中的每一元素与所述第二可能触控范围每一元素的距离，由这些判断可得一可能触控范围交集。即依序计算所述第一可能触控范围中的元素与所述第二可能触控范围每一元素的距离，并判断所计算的这些结果中是否有一个距离值为0，若是，则表示所述第一可能触控范围中的元素也在所述第二可能触控范围内，故所述第一可能触控范围中的元素为所述可能触控范围交集的元素。In step D, the distance between each element in the first possible touch range and each element in the second possible touch range is calculated, and a possible touch range intersection can be obtained from these judgments. That is, sequentially calculate the distance between the elements in the first possible touch range and each element in the second possible touch range, and judge whether one of the calculated results has a distance value of 0, and if so, it means The elements in the first possible touch range are also in the second possible touch range, so the elements in the first possible touch range are elements at the intersection of the possible touch ranges.
当判断所计算的距离均不为0，则表示所述第一可能触控范围中的元素不在所述第二可能触控范围内，故所述第一可能触控范围中的元素不是所述可能触控范围交集的元素。When it is judged that none of the calculated distances is 0, it means that the elements in the first possible touch range are not in the second possible touch range, so the elements in the first possible touch range are not in the Elements whose touch ranges intersect.
例如，所述第一可能触控范围中的(D6,S4)与所述第二可能触控范围中的任一个元素{(D3,S5)、(D7,S4)、(D7,S5)、(D8,S4)、(D8,S5)、(D8,S6)}的距离均大于0，因此(D6,S4)不是所述可能触控范围交集的元素，而所述第一可能触控范围中的(D7,S4)与所述第二可能触控范围中的(D7,S4)的距离为0，因此所述第一可能触控范围中的(D7,S4)为所述可能触控范围交集的元素。For example, (D6, S4) in the first possible touch range and any element {(D3, S5), (D7, S4), (D7, S5), The distances of (D8, S4), (D8, S5), and (D8, S6)} are all greater than 0, so (D6, S4) is not an element of the intersection of the possible touch ranges, and the first possible touch range The distance between (D7, S4) in the second possible touch range and (D7, S4) in the second possible touch range is 0, so (D7, S4) in the first possible touch range is the possible touch Elements of range intersection.
前述方式是以所述第一可能触控范围中的元素为基础，以计算该元素与所述第二可能触控范围中的每一元素的距离，以判断所述第一可能触控范围中的元素是否为所述可能触控范围交集的元素。也可以所述第二可能触控范围中的元素为基础，以计算该元素与所述第一可能触控范围中的每一元素的距离，以判断所述第二可能触控范围中的元素是否为所述可能触控范围交集的元素。例如，所述第二可能触控范围中的(D3,S5)与所述第一可能触控范围中的任一个元素{(D6,S4)、(D6,S5)、(D6,S6)、(D7,S4)、(D7,S5)、(D7,S6)、(D8,S4)、(D8,S5)、(D8,S6)}的距离均大于0，因此(D3,S5)不是所述可能触控范围交集的元素。The foregoing method is based on an element in the first possible touch range, and calculates the distance between the element and each element in the second possible touch range, so as to determine the distance between the element in the first possible touch range. Whether the element of is an element at the intersection of the possible touch ranges. It can also be based on the elements in the second possible touch range, by calculating the distance between the element and each element in the first possible touch range, so as to determine the elements in the second possible touch range Whether it is an element at the intersection of the possible touch ranges. For example, (D3, S5) in the second possible touch range and any element {(D6, S4), (D6, S5), (D6, S6), (D7,S4), (D7,S5), (D7,S6), (D8,S4), (D8,S5), (D8,S6)} are all greater than 0, so (D3,S5) is not Elements at the intersection of the possible touch ranges mentioned above.
为求更准确计算出触碰点的坐标，也可先以所述第一可能触控范围中的元素为基础以计算该元素与所述第二可能触控范围中的每一元素的距离，再以所述第二可能触控范围中的元素为基础，以计算该元素与所述第一可能触控范围中的每一元素的距离而获得所述可能触控范围交集。In order to calculate the coordinates of the touch point more accurately, the distance between the element and each element in the second possible touch range may be calculated based on the elements in the first possible touch range, Based on the element in the second possible touch range, the distance between the element and each element in the first possible touch range is calculated to obtain the intersection of the possible touch ranges.
若有，即若所述第二可能触控范围与所述第一可能触控范围有交集，则于步骤E中，产生所述可能触控范围交集，并依据所述可能触控范围交集以计算触碰点的坐标。If yes, that is, if there is an intersection between the second possible touch range and the first possible touch range, then in step E, the intersection of the possible touch ranges is generated, and based on the intersection of the possible touch ranges, Calculate the coordinates of the touch point.
图14为本发明产生一可能触控范围交集的示意图。当执行步骤B和步骤C之后，可先通过自感电容驱动感测找出有效的触控范围，再通过互感电容型感测找出有效的触控点，如图14所示。其先将可能的触控位置经由多次自感电容驱动感测侦测出来(包含鬼点)，再与互感电容型感测技术侦测触控面板，比对两者数据共通性，判断出没有受噪声影响的数据。也可将所得到的触控范围与可能的触控点作比较，其中，触控范围可以是感测轴上可能的触控范围、驱动轴上可能的触控范围或是感测及驱动轴上可能的触控范围。可能的触控点为手指或触控介质的感测点、噪声或其他内外因素产生的杂点，实施例中在可能的触控范围寻找触控点，亦可在可能的触控点找出对应有效的触控范围。如图14所示，该可能触控范围交集为{(D7,S4)、(D7,S5)、(D8,S4)、(D8,S5)、(D8,S6)}。FIG. 14 is a schematic diagram of generating an intersection of possible touch ranges according to the present invention. After step B and step C are performed, the effective touch range can be found through self-inductance capacitive driving sensing, and then effective touch points can be found through mutual inductance capacitive sensing, as shown in FIG. 14 . It first detects the possible touch position through multiple self-inductance capacitive drive sensing (including ghost points), and then detects the touch panel with the mutual inductance capacitive sensing technology, compares the commonality of the two data, and judges No data affected by noise. The resulting touch range can also be compared to the possible touch points, where the touch range can be the possible touch range on the sensing axis, the possible touch range on the driving axis, or the sensing and driving axis possible touch range. Possible touch points are the sensing points of fingers or touch media, noise or other internal and external factors. Corresponds to the effective touch range. As shown in FIG. 14 , the intersection of possible touch ranges is {(D7, S4), (D7, S5), (D8, S4), (D8, S5), (D8, S6)}.
图15为本发明产生一可能触控范围交集的另一示意图。其先通过互容触控找出有效的触控范围，再通过自容触控找出有效的触控点。FIG. 15 is another schematic diagram of generating an intersection of possible touch ranges according to the present invention. It first finds the effective touch range through mutual capacitive touch, and then finds out effective touch points through self-capacitive touch.
于步骤F中，输出触碰点的坐标。In step F, the coordinates of the touch point are output.
此外，于步骤D中，若判定所述第二可能触控范围与所述第一可能触控范围没有交集，则重新执行步骤B。In addition, in step D, if it is determined that the second possible touch range does not overlap with the first possible touch range, step B is re-executed.
图16为本发明一应用的示意图。当电容式触控面板110上有水滴时，对互感电容驱动感测技术而言，只能侦测到负值，无法有效地判断触碰点的坐标。然而，对自感电容驱动感测技术而言，水滴跟手指的触碰反应一样，所以利用本发明技术而得知水滴的存在，以进行后续的处理。Figure 16 is a schematic diagram of an application of the present invention. When there is water drop on the capacitive touch panel 110 , for the mutual capacitance driving sensing technology, only negative values can be detected, and the coordinates of the touch point cannot be effectively determined. However, for the self-capacitance driven sensing technology, the water drop has the same touch response as the finger, so the existence of the water drop is known by using the technology of the present invention for subsequent processing.
由前述说明可知，单独使用互感电容型感测技术可能会产生许多杂点，甚至会使原本的触碰点消失。因此本发明整合自感电容驱动感测和互感电容型感测技术，将坐标数据进行相互比对，即先将可能的触控位置经由自容式侦测出来(包含鬼点)，再与互容式触控技术侦测触控面板，比对两者数据共同性，以判断出没有受噪声影响的数据，进而输出真实坐标。此方法可以减少滤波电路的使用与设计，因此能以较少的系统资源得到正确且稳定的坐标输出。It can be known from the foregoing description that using the mutual inductance capacitance sensing technology alone may generate many noise points, and even make the original touch points disappear. Therefore, the present invention integrates self-capacitance-driven sensing and mutual-inductance-capacitance sensing technology, and compares the coordinate data with each other, that is, first detects possible touch positions (including ghost points) through self-capacitance, and then compares the coordinate data with each other. Capacitive touch technology detects the touch panel, compares the data commonality between the two to determine the data that is not affected by noise, and then outputs the real coordinates. This method can reduce the use and design of filter circuits, so that correct and stable coordinate output can be obtained with less system resources.
而本发明使用自电容触控技术，具有在驱动或感测线上不易受噪声干扰的特性，先使用自电容标记出合理的触控发生范围，辅以互电容触控技术能正确找出触碰点的特性，进而达成滤除噪声的目的。However, the present invention uses self-capacitance touch technology, which has the characteristics that the driving or sensing line is not easily disturbed by noise. The characteristics of the touch point, and then achieve the purpose of filtering noise.
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明保护的范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.
| Application Number | Priority Date | Filing Date | Title |
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| CN201310045849.6ACN103076939B (en) | 2013-02-05 | 2013-02-05 | Method of Alternate Scanning Using Self Capacitance and Mutual Capacitance Sensing to Remove Touch Noise |
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| CN201310045849.6ACN103076939B (en) | 2013-02-05 | 2013-02-05 | Method of Alternate Scanning Using Self Capacitance and Mutual Capacitance Sensing to Remove Touch Noise |
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