TWI763859B - Sensing method of touch recognition device and sensing module thereof - Google Patents

Sensing method of touch recognition device and sensing module thereof

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TWI763859B
TWI763859B TW107118790A TW107118790A TWI763859B TW I763859 B TWI763859 B TW I763859B TW 107118790 A TW107118790 A TW 107118790A TW 107118790 A TW107118790 A TW 107118790A TW I763859 B TWI763859 B TW I763859B
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sensing
measurement
electrodes
value
driving
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TW202004445A (en
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李尚禮
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李尚禮
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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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • 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

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  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
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  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)

Abstract

一種觸控辨識裝置之感測方法，其中觸控辨識裝置包括感測電極及驅動電極交會而具有節點，感測方法包括：選定一第一感測電極，並將其設為反向量測，且與驅動電極交會而具有第一節點；驅動一個以上驅動電極，並量測第一感測電極以得到第一節點的第一量測值，再量測第一感測電極以外的其他感測電極，以得到節點的點量測值；比較同一個驅動電極上的每一點量測值分別與第一量測值的變異值；檢查變異值是否高於或低於閾限值；若是，則判斷點量測值上所在的感測電極為異常；以及，當至少一變異值高於或低於閾限值時，停止觸控量測。 A sensing method of a touch identification device, wherein the touch identification device includes a node where a sensing electrode and a driving electrode intersect, and the sensing method includes: selecting a first sensing electrode and setting it to reverse measurement, and intersecting with the driving electrode to have a first node; driving more than one driving electrode, and measuring the first sensing electrode to obtain a first measurement value of the first node, and then measuring other sensing electrodes other than the first sensing electrode electrode to obtain the point measurement value of the node; compare the variation value of each point measurement value on the same driving electrode with the first measurement value; check whether the variation value is higher or lower than the threshold value; if so, then It is judged that the sensing electrode on the measured value of the point is abnormal; and when at least one variation value is higher than or lower than the threshold value, the touch measurement is stopped.

Description

觸控辨識裝置之感測方法及其感測模組 Sensing method of touch recognition device and sensing module thereof

本發明關於一種觸控辨識裝置之感測方法及其感測模組，特別是關於一種判斷觸控訊號讀取時有無異物位於觸控辨識裝置上的感測方法及其感測模組，來提高整體感測精確度。 The present invention relates to a sensing method of a touch recognition device and a sensing module thereof, and in particular, to a sensing method and a sensing module thereof for judging whether there is foreign matter on the touch recognition device when a touch signal is read, to Improve overall sensing accuracy.

觸控面板或觸控螢幕是主要的現代人機介面之一，作為一種位置辨識裝置，能夠巧妙的結合輸入和顯示介面，故具有節省裝置空間和操作人性化的優點，目前已非常廣泛應用在各式消費性或者工業性電子產品上。舉例：個人數位助理(personal digital assistant，PDA)、掌上型電腦(palm-sized PC)、平板電腦(tablet computer)、行動電話(mobile phone)、資訊家電(Information Appliance)、銷售櫃員機(Point-Of-Sale，POS)等裝置上。 The touch panel or touch screen is one of the main modern human-machine interfaces. As a position recognition device, it can skillfully combine the input and display interface, so it has the advantages of saving device space and humanized operation. It has been widely used in All kinds of consumer or industrial electronic products. Examples: personal digital assistant (PDA), palm-sized PC, tablet computer, mobile phone, Information Appliance, Point-Of -Sale, POS) and other devices.

現有電容式觸控面板包括資料處理模組、驅動電極及感應電極等，其中驅動電極及感應電極分別經由各自之介面與資料處理模組電性連結。驅動電極係由相互平行的複數個驅動電極條所組成，感應電極係由複數個相互平行的感應電極條所組成，其中各驅動電極條與各感應電極條 係互相垂直配置而形成複數個交叉處。當驅動電極受到驅動電壓之驅動時，其與感應電極之間形成電場，使得感應電極產生感應電荷，而具有一交互電容，複數個驅動電極條與複數個感應電極條即形成複數個電場，因此可擬似每一該交叉處即具有一交互電容，複數個交叉處即形成交互電容陣列。交互電容陣列在穩態之環境下，具有一穩定之電容量(以下稱基底電容)，使得感應電極產生一感應電壓(此時之感應電壓稱為基底電壓)，資料處理模組經由其介面讀取感應電壓。當手指或其他導電物質接近交叉處時，將改變該處之電場，造成感應電壓變化。變化之感應電壓向資料處理模組傳輸後，由類比對數位轉換器轉換成數位訊號後，再由經由演算法辨識其是否為一觸控訊號，決定是否進行觸碰位置之演算，進而處理形成向主機端輸出的觸碰資訊輸入資料。其中，主機端為具有至少一中央處理器(CPU)控制的設備，例如電腦、PDA等。 The existing capacitive touch panel includes a data processing module, driving electrodes and sensing electrodes, etc., wherein the driving electrodes and the sensing electrodes are electrically connected to the data processing module through their respective interfaces. The driving electrodes are composed of a plurality of parallel driving electrode strips, and the sensing electrodes are composed of a plurality of mutually parallel sensing electrode strips, wherein each driving electrode strip and each sensing electrode strip are arranged perpendicular to each other to form a plurality of intersections . When the driving electrode is driven by the driving voltage, an electric field is formed between it and the sensing electrode, so that the sensing electrode generates an induced charge and has an interactive capacitance. A plurality of driving electrode strips and a plurality of sensing electrode strips form a plurality of electric fields, so It can be simulated that each intersection has an interactive capacitor, and a plurality of intersections form an array of interactive capacitors. In a stable environment, the interactive capacitor array has a stable capacitance (hereinafter referred to as the base capacitor), so that the sensing electrode generates an induced voltage (the induced voltage at this time is called the base voltage), and the data processing module reads through its interface. Take the induced voltage. When a finger or other conductive material approaches the intersection, it will change the electric field there, causing the induced voltage to change. After the changed induced voltage is transmitted to the data processing module, it is converted into a digital signal by an analog-to-digital converter, and then it is identified by an algorithm whether it is a touch signal, and whether to perform the calculation of the touch position is processed and formed. Input data to the touch information output from the host. The host end is a device controlled by at least one central processing unit (CPU), such as a computer, a PDA, and the like.

由於驅動電極與感應電極之間所形成的電場容易受到外來電磁波等的干擾，導致不能準確地量測手指等導電性物質所引起的電容性充電轉移之電荷量的變化。因此現有技術有利用訊號相減的方式將此一雜訊減除的方法，其重複進行一量測循環，得到二個以上不同的感測電壓訊號再相減之。藉由差分法(deferential)處理二個以上不同的感測電壓訊號，以得到消除基底雜訊(common mode noise)的觸控訊號。採用一般差分法雖然可以消除基底雜訊，但是需要兩兩成對的感測訊號來計算出差分值，可能在量測過程中有異物觸碰而造成精確度或解析度下降。 Since the electric field formed between the driving electrode and the sensing electrode is easily disturbed by external electromagnetic waves, etc., it is impossible to accurately measure the change in the amount of charge transferred by capacitive charging caused by conductive substances such as fingers. Therefore, in the prior art, there is a method of subtracting this noise by means of signal subtraction, which repeats a measurement cycle to obtain two or more different sensing voltage signals and then subtract them. Two or more different sensing voltage signals are processed by a differential method to obtain a touch signal that eliminates common mode noise. Although the general differential method can eliminate the background noise, it needs two pairs of sensing signals to calculate the differential value, which may cause foreign objects to touch during the measurement process, resulting in a decrease in accuracy or resolution.

鑑於上述發明背景，本發明實施例提供一種觸控辨識裝置之感測方法及其感測模組，通過週期性或即時性穿插執行一判斷程序於執行感測方法的一般週期波差異比較運算中，可以判斷觸控訊號讀取時有無異物位於觸控辨識裝置上以及消除雜訊訊號的感測方法及其感測模組，來提高整體感測精確度。 In view of the above-mentioned background of the invention, the embodiments of the present invention provide a sensing method of a touch recognition device and a sensing module thereof, which execute a judgment program periodically or instantaneously during the general periodic wave difference comparison operation of the sensing method. In this way, it can be judged whether there is foreign matter on the touch recognition device when the touch signal is read, and the sensing method and the sensing module thereof can eliminate the noise signal, so as to improve the overall sensing accuracy.

為了達到上述之一或部份或全部目的或是其他目的，本發明實施例提供一種觸控辨識裝置之感測方法，其中觸控辨識裝置包括複數個感測電極及複數個驅動電極，其中複數個感測電極與複數個驅動電極交會而具有複數個節點，感測方法包括以下步驟：選定複數個感測電極中的一第一感測電極，並將第一感測電極設為反向量測，其中第一感測電極與複數個驅動電極交會而具有複數個第一節點；驅動一個或一個以上驅動電極，並量測第一感測電極以得到一個或一個以上第一節點的一第一量測值，再量測第一感測電極以外的其他感測電極，以得到複數個節點的複數個點量測值；比較同一個驅動電極上的每一點量測值分別與第一量測值的一變異值；檢查變異值是否高於或低於一閾限值；若變異值高於或低於閾限值，則判斷點量測值上所在的感測電極為異常；以及，當至少一個變異值高於或低於閾限值時，停止一觸控量測。 In order to achieve one or part or all of the above objectives or other objectives, an embodiment of the present invention provides a sensing method for a touch recognition device, wherein the touch recognition device includes a plurality of sensing electrodes and a plurality of driving electrodes, wherein a plurality of A plurality of sensing electrodes intersect with a plurality of driving electrodes to have a plurality of nodes. The sensing method includes the following steps: selecting a first sensing electrode among the plurality of sensing electrodes, and setting the first sensing electrode as an inverse amount measurement, wherein the first sensing electrode and a plurality of driving electrodes intersect to have a plurality of first nodes; one or more driving electrodes are driven, and the first sensing electrodes are measured to obtain a first node of one or more first nodes a measurement value, and then measure other sensing electrodes other than the first sensing electrode to obtain a plurality of point measurement values of a plurality of nodes; compare each point measurement value on the same driving electrode with the first measurement value respectively a variation value of the measured value; check whether the variation value is higher or lower than a threshold value; if the variation value is higher or lower than the threshold value, the sensing electrode on which the measured value of the point is determined is abnormal; and, When at least one variation value is higher or lower than the threshold value, a touch measurement is stopped.

在一實施例中，感測電極被判斷為異常的數量為至少兩個，則停止觸控量測。 In one embodiment, the touch measurement is stopped when the number of the sensing electrodes determined to be abnormal is at least two.

在一實施例中，若變異值未高於或低於閾限值，或是感測電極為異常的數量未達兩個時，則進行觸控量測。 In one embodiment, if the variation value is not higher or lower than the threshold value, or the number of abnormal sensing electrodes is less than two, touch measurement is performed.

在一實施例中，得到第一量測值及複數個點量測值之步驟更包括：驅動複數個驅動電極的其一者或一部份者；量測第一感測電極以得到一個或一個以上第一節點的第一量測值，再同時或依序量測第一感測電極以外的其他感測電極，以得到複數個點量測值的一者或一部份者；停止驅動；驅動複數個驅動電極的另一者或其餘部分者；量測第一感測電極以得到一個或一個以上第一節點的第一量測值，再同時或依序量測第一感測電極以外的其他感測電極，以得到複數個點量測值的另一者或其餘部分者；以及，重複上述驅動動作，以得到全部的複數個點量測值及複數個第一量測值。 In one embodiment, the step of obtaining the first measurement value and the plurality of point measurement values further includes: driving one or a part of the plurality of driving electrodes; measuring the first sensing electrodes to obtain one or more The first measurement values of one or more first nodes, and then simultaneously or sequentially measure other sensing electrodes other than the first sensing electrodes to obtain one or a part of the measurement values of a plurality of points; stop driving ; drive the other or the rest of the plurality of drive electrodes; measure the first sensing electrodes to obtain first measurement values of one or more first nodes, and then simultaneously or sequentially measure the first sensing electrodes to obtain the other or the rest of the plurality of point measurement values; and repeating the above driving operation to obtain all the plurality of point measurement values and the plurality of first measurement values.

在一實施例中，得到第一量測值及複數個點量測值之步驟更包括：同時驅動複數個驅動電極的全部者；以及，量測第一感測電極以得到全部的第一節點的第一量測值，再同時量測第一感測電極以外的其他感測電極，以得到全部的複數個點量測值。 In one embodiment, the step of obtaining the first measurement value and the plurality of point measurement values further includes: simultaneously driving all of the plurality of driving electrodes; and measuring the first sensing electrodes to obtain all the first nodes The first measurement value of , and other sensing electrodes other than the first sensing electrode are simultaneously measured, so as to obtain all the measurement values of a plurality of points.

在一實施例中，更包括：選定複數個感測電極中的另一者作為第一感測電極，以將第一感測電極設為反向量測。 In one embodiment, the method further includes: selecting another one of the plurality of sensing electrodes as the first sensing electrode, so as to set the first sensing electrode as reverse measurement.

在一實施例中，將第一感測電極設為反向量測的步驟包括將第一感測電極電性連接至一反向量測電路，或是一處理單元在此量測循環將經由第一感測電極所收到的訊號進行反向處理。觸控量測更包括：電性連接複數個感測電極之其餘者至一正向量測電路，並進行觸控量測而得到一觸控訊號。其中觸控量測之步驟包括：反向量測電路依序會同正向量測電路進行量測，分別同步得到一反向訊號及一正向訊號；以及，通過一類比數位轉換電路接收反向訊號及正向訊號，來轉換得到一觸控訊號，其中正向 訊號與反向訊號的相位訊號是180度偏移。 In one embodiment, the step of setting the first sensing electrode for reverse measurement includes electrically connecting the first sensing electrode to a reverse measurement circuit, or a processing unit will pass through the measurement cycle in this measurement cycle. The signal received by the first sensing electrode is processed in reverse. The touch measurement further includes: electrically connecting the rest of the plurality of sensing electrodes to a positive vector measurement circuit, and performing touch measurement to obtain a touch signal. The step of touch measurement includes: the reverse measurement circuit and the forward measurement circuit perform measurement in sequence, and obtain a reverse signal and a forward signal synchronously respectively; and receive the reverse signal through an analog digital conversion circuit. The signal and the forward signal are converted to obtain a touch signal, wherein the phase signals of the forward signal and the reverse signal are shifted by 180 degrees.

在一實施例中，若變異值高於閾限值，則判斷有一指向物件觸碰第一感測電極。 In one embodiment, if the variation value is higher than the threshold value, it is determined that a pointing object touches the first sensing electrode.

在一實施例中，若變異值低於閾限值，則判斷一非指向物件觸碰第一感測電極。 In one embodiment, if the variation value is lower than the threshold value, it is determined that a non-pointing object touches the first sensing electrode.

為了達到上述之一或部份或全部目的或是其他目的，本發明實施例提供一種觸控辨識裝置之感測模組，包括：複數個感測電極，包括一設為反向量測的第一感測電極；複數個驅動電極，與複數個感測電極交會而具有複數個節點，與第一感測電極交會而具有複數個第一節點；以及，一處理單元電性連接複數個驅動電極及複數個感測電極，用以驅動一個或一個以上驅動電極，量測第一感測電極以得到一個或一個以上第一節點的一第一量測值，再量測第一感測電極以外的其他感測電極，以得到複數個節點的複數個點量測值；其中處理單元比較同一個驅動電極上的每一點量測值分別與每一第一量測值的一變異值；處理單元檢查變異值是否高於或低於一閾限值；若變異值高於或低於閾限值，則處理單元判斷點量測值上的感測電極為異常；以及當至少一個變異質高於或低於閾限值，處理單元停止一觸控量測。其中若變異值未高於或低於閾限值，或是感測電極為異常的數量未達兩個時，則處理單元進行觸控量測。 In order to achieve one or part or all of the above purposes or other purposes, an embodiment of the present invention provides a sensing module of a touch recognition device, comprising: a plurality of sensing electrodes, including a first sensor configured for reverse measurement a sensing electrode; a plurality of driving electrodes, intersecting with the sensing electrodes to have a plurality of nodes, and intersecting with the first sensing electrodes to have a plurality of first nodes; and a processing unit electrically connected to the plurality of driving electrodes and a plurality of sensing electrodes for driving one or more driving electrodes, measuring the first sensing electrodes to obtain a first measurement value of one or more first nodes, and measuring other than the first sensing electrodes other sensing electrodes to obtain a plurality of point measurement values of a plurality of nodes; wherein the processing unit compares each point measurement value on the same driving electrode with a variation value of each first measurement value; the processing unit Check whether the variation value is higher or lower than a threshold value; if the variation value is higher or lower than the threshold value, the processing unit judges that the sensing electrode on the measured value of the point is abnormal; and when at least one variation quality is higher than or equal to the threshold value or below the threshold value, the processing unit stops a touch measurement. Wherein, if the variation value is not higher or lower than the threshold value, or the number of abnormal sensing electrodes is less than two, the processing unit performs touch measurement.

100、200‧‧‧感測模組 100, 200‧‧‧Sensing module

110、210‧‧‧處理單元 110, 210‧‧‧processing unit

120(D1-D7)、220(225A-225D)‧‧‧驅動電極 120(D1-D7), 220(225A-225D)‧‧‧driving electrodes

130(S1-S4)、230(S1-S7)‧‧‧感測電極 130(S1-S4), 230(S1-S7)‧‧‧Sensing electrodes

圖1為本發明第一實施例中一種應用於觸控辨識裝置之感測模組的示意圖。 FIG. 1 is a schematic diagram of a sensing module applied to a touch recognition device according to a first embodiment of the present invention.

圖2為本發明實施例中一種應用於觸控辨識裝置之感測方法的流程圖。 FIG. 2 is a flowchart of a sensing method applied to a touch recognition device according to an embodiment of the present invention.

圖3為本發明第一實施例中一種應用於觸控辨識裝置之感測模組的示意圖。 FIG. 3 is a schematic diagram of a sensing module applied to a touch recognition device according to the first embodiment of the present invention.

圖4為本發明第二實施例中一種應用於觸控辨識裝置之感測模組的示意圖。 FIG. 4 is a schematic diagram of a sensing module applied to a touch recognition device according to a second embodiment of the present invention.

有關本發明前述及其他技術內容、特點與功效，在以下配合參考圖式之一較佳實施例的詳細說明中，將可清楚的呈現。以下實施例中所提到的方向用語，例如：上、下、左、右、前或後等，僅是用於參照隨附圖式的方向。因此，該等方向用語僅是用於說明並非是用於限制本發明。 The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or rear, etc., are only used to refer to the directions of the accompanying drawings. Therefore, these directional terms are only used to illustrate and not to limit the present invention.

請參照圖1，是本發明第一實施例中的一種觸控辨識裝置之感測模組100。一種觸控辨識裝置之感測模組100包括一處理單元110、複數個驅動電極120及複數個感測電極130。於本實施例中，驅動電極120包括至少7條驅動電極D1-D7，感測電極130包括至少4條感測電極S1-S4。複數個驅動電極120與複數個感測電極130交會而具有複數個節點D1S1、D1S2、D1S3、D1S4、D2S1、D2S2...等。處理單元110電性連接感測電極130及驅動電極120，用以驅動驅動電極120並感測感測電極130上的電容變化，以得到複數個節點的複數個點量測值。 Please refer to FIG. 1 , which is a sensing module 100 of a touch recognition device according to a first embodiment of the present invention. A sensing module 100 of a touch recognition device includes a processing unit 110 , a plurality of driving electrodes 120 and a plurality of sensing electrodes 130 . In this embodiment, the driving electrodes 120 include at least seven driving electrodes D1-D7, and the sensing electrodes 130 include at least four sensing electrodes S1-S4. The plurality of driving electrodes 120 and the plurality of sensing electrodes 130 intersect to have a plurality of nodes D1S1 , D1S2 , D1S3 , D1S4 , D2S1 , D2S2 . . . and so on. The processing unit 110 is electrically connected to the sensing electrodes 130 and the driving electrodes 120 for driving the driving electrodes 120 and sensing capacitance changes on the sensing electrodes 130 to obtain a plurality of point measurement values of a plurality of nodes.

上述感測模組100用以執行以下本發明實施例中的一種觸控辨識裝置之感測方法。 The above-mentioned sensing module 100 is used to execute a sensing method of a touch recognition device in the following embodiments of the present invention.

請參照圖2，是本發明實施例中一種觸控辨識裝置之感測方法的流程示意圖，並配合圖3及圖4說明。本發明實施例的感測方法包括以下步驟S100-S700來執行判斷程序並配合執行觸控量測。 Please refer to FIG. 2 , which is a schematic flowchart of a sensing method of a touch recognition device according to an embodiment of the present invention, and is described with reference to FIGS. 3 and 4 . The sensing method according to the embodiment of the present invention includes the following steps S100-S700 to execute a judgment procedure and to perform touch measurement.

步驟S100：選定複數個感測電極S1-S4中的一第一感測電極。於本實施例中預先選定感測電極S1為第一感測電極，並設定感測電極S1作為反向量測來使用。第一感測電極S1與複數個驅動電極D1-D7交會而具有複數個第一節點D1S1、D2S1、D3S1...等。其中設定感測電極S1作為反向量測的步驟包括將感測電極S1電性連接至一反向量測電路，使得處理單元110在此一量測循環中，可將經由第一感測電極S1所收到的訊號進行反向處理，例如乘上一負號，以節省運算時間。 Step S100: Select a first sensing electrode among the plurality of sensing electrodes S1-S4. In this embodiment, the sensing electrode S1 is preselected as the first sensing electrode, and the sensing electrode S1 is set to be used for reverse measurement. The first sensing electrode S1 intersects with a plurality of driving electrodes D1-D7 to have a plurality of first nodes D1S1, D2S1, D3S1 . . . and so on. The step of setting the sensing electrode S1 as the reverse measurement includes electrically connecting the sensing electrode S1 to a reverse measurement circuit, so that the processing unit 110 can use the first sensing electrode in this measurement cycle. The signal received by S1 is processed in reverse, for example, multiplied by a minus sign, so as to save operation time.

步驟S200：驅動一個或一個以上的驅動電極，量測第一感測電極以得到一個或一個以上第一節點的量測值，再量測第一感測電極以外的其他感測電極，以得到其他複數個節點的複數個點量測值。在本實施例中，上述複數個節點的點量測值或第一個節點量測值為週期波驅動所產生的變異值。 Step S200 : Drive one or more driving electrodes, measure the first sensing electrodes to obtain the measurement value of one or more first nodes, and then measure other sensing electrodes other than the first sensing electrodes to obtain Plural point measurements of other pluralities of nodes. In this embodiment, the point measurement value of the plurality of nodes or the first node measurement value is the variation value generated by the periodic wave driving.

在一實施例中，得到第一量測值及複數個點量測值之步驟更包括：驅動驅動電極的其一者或一部份者；量測第一感測電極以得到一個或一個以上第一節點的第一量測值，再同時或依序量測第一感測電極以外的其他感測電極，以得到複數個點量測值的一者或一部份者；停止驅動；驅動複數個驅動電極的另一者或其餘部分者；量測第一感測電極以得到一個或一個以上第一節點的第一量測值，再同時或依序量測第一感測電極以外的其他感測電極，以得到複數個點量測值的另一者或其餘部分者；以及， 重複上述驅動動作，以得到全部的點量測值及第一量測值。 In one embodiment, the step of obtaining the first measurement value and the plurality of point measurement values further includes: driving one or a part of the driving electrodes; measuring the first sensing electrodes to obtain one or more than one The first measurement value of the first node, and then simultaneously or sequentially measure other sensing electrodes other than the first sensing electrode to obtain one or a part of the measurement values of a plurality of points; stop driving; drive The other or the rest of the plurality of driving electrodes; measuring the first sensing electrodes to obtain first measurement values of one or more first nodes, and simultaneously or sequentially measuring other than the first sensing electrodes other sensing electrodes to obtain the other or the rest of the plurality of point measurement values; and, repeating the above driving operation to obtain all the point measurement values and the first measurement value.

在第一實施例中，如圖3所示，先驅動驅動電極D1，依序得到不同節點D1S1、D1S2、D1S3、D1S4的點量測值，其中包含第一節點D1S1的一第一量測值。接著，跟著箭頭方向依序驅動驅動電極D2，而得到不同節點D2S1、D2S2、D2S3、D2S4的點量測值，其中包含第一節點D2S1的第一量測值。然後，依序驅動驅動電極D3及D4，而得到所有節點D3S1、D3S2、D3S3、D3S4、D4S1、D4S2、D4S3、D4S4的點量測值。 In the first embodiment, as shown in FIG. 3 , the driving electrode D1 is driven first to obtain point measurement values of different nodes D1S1 , D1S2 , D1S3 , and D1S4 in sequence, including a first measurement value of the first node D1S1 . Next, the driving electrode D2 is sequentially driven in the direction of the arrow to obtain point measurement values of different nodes D2S1 , D2S2 , D2S3 , and D2S4 , including the first measurement value of the first node D2S1 . Then, the driving electrodes D3 and D4 are sequentially driven to obtain the point measurement values of all nodes D3S1, D3S2, D3S3, D3S4, D4S1, D4S2, D4S3, and D4S4.

圖4是本發明第二實施例中的一種觸控辨識裝置之感測模組200。感測模組200包括一處理單元210、複數個驅動電極220及複數個感測電極230。處理單元210電性連接感測電極230及驅動電極220。於本實施例中，驅動電極220被區分成四個部分，分別為第一部份驅動電極225A-225D，感測電極230包括至少7條感測電極S1-S7。複數個驅動電極220與複數個感測電極230交會而具有複數個節點，且仍是選定感測電極S1為第一感測電極。於第二實施例中，先驅動第一部份驅動電極225A，依序得到不同節點225AS1、225AS2、225AS3...等的點量測值，其中包含第一節點D1S1的一第一量測值。接著，跟著箭頭方向依序驅動第二部分驅動電極225B，再驅動第三部分驅動電極225C及第四部份驅動電極225D，而得到所有節點的點量測值。 FIG. 4 is a sensing module 200 of a touch recognition device according to a second embodiment of the present invention. The sensing module 200 includes a processing unit 210 , a plurality of driving electrodes 220 and a plurality of sensing electrodes 230 . The processing unit 210 is electrically connected to the sensing electrodes 230 and the driving electrodes 220 . In this embodiment, the driving electrodes 220 are divided into four parts, which are the first part of the driving electrodes 225A-225D, and the sensing electrodes 230 include at least seven sensing electrodes S1-S7. A plurality of driving electrodes 220 and a plurality of sensing electrodes 230 intersect to have a plurality of nodes, and the sensing electrode S1 is still selected as the first sensing electrode. In the second embodiment, the first part of the driving electrode 225A is driven first, and the point measurement values of different nodes 225AS1, 225AS2, 225AS3, etc. are sequentially obtained, including a first measurement value of the first node D1S1. . Next, the second portion of the driving electrodes 225B, the third portion of the driving electrodes 225C, and the fourth portion of the driving electrodes 225D are driven in sequence following the direction of the arrows to obtain point measurement values of all nodes.

在本步驟S200的上述實施例中，本發明並不限定於此步驟中得到全部的點量測值及第一量測值，可先執行驅動驅動電極的其一者或一部份者，並得到第一感測電極的第一量測值及感測電極的其一者或一部份的複數個節點的點量測值，即可接續下個步驟S300-S400，再回到步驟 S200以得到全部點量測值及第一量測值。 In the above-mentioned embodiments of this step S200, the present invention is not limited to obtaining all the point measurement values and the first measurement values in this step, and one or a part of the driving electrodes may be driven first, and then After obtaining the first measurement value of the first sensing electrode and the point measurement value of a plurality of nodes of one or a part of the sensing electrode, the next steps S300-S400 can be continued, and then go back to step S200 to Obtain all point measurement values and the first measurement value.

在一實施例中，再一次參酌圖3，第一次先驅動驅動電極D1，依序得到不同節點D1S1、D1S2、D1S3、D1S4的點量測值，其中包含第一節點D1S1的一第一量測值。接著，跟著黑色大箭頭方向，第二次直接跳選驅動驅動電極D4，而得到不同節點D4S1、D4S2、D4S3、D4S4的點量測值，其中包含第一節點D4S1的第一量測值。然後，繼續跳選驅動其他驅動電極。其中，第二次驅動可直接跳選驅動電極D4，也就是距離第一次驅動驅動電極D1處，相差隔了3條驅動電極；本發明並不限定此實施例，抑或是可跳選相差隔了4-5條的驅動電極D5或D6，來加快感測方法的反應時間。 In one embodiment, referring to FIG. 3 again, the driving electrode D1 is driven for the first time to obtain point measurement values of different nodes D1S1, D1S2, D1S3, and D1S4 in sequence, including a first value of the first node D1S1. measured value. Then, following the direction of the big black arrow, the driving electrode D4 is directly jumped for the second time to obtain point measurement values of different nodes D4S1, D4S2, D4S3, and D4S4, including the first measurement value of the first node D4S1. Then, continue to jump to drive other drive electrodes. Among them, the second driving can directly select the driving electrode D4, that is, the distance from the first driving driving electrode D1 is separated by 3 driving electrodes; 4-5 driving electrodes D5 or D6 are used to speed up the response time of the sensing method.

在另一實施例中，得到第一量測值及複數個點量測值之步驟更包括：同時驅動複數個驅動電極的全部者；以及，量測第一感測電極以得到全部的第一節點的第一量測值，再同時量測第一感測電極以外的其他感測電極，以得到全部的複數個點量測值。 In another embodiment, the step of obtaining the first measurement value and the plurality of point measurement values further includes: simultaneously driving all of the plurality of driving electrodes; and measuring the first sensing electrodes to obtain all the first The first measurement value of the node, and other sensing electrodes other than the first sensing electrode are simultaneously measured to obtain all the measurement values of the plurality of points.

步驟S300：比較同一個驅動電極上的每一點量測值分別與第一量測值的一變異值。如圖2所示的第一實施例中，於步驟S200中，驅動驅動電極D1後，依序求出第一節點D1S1的第一量測值分別與其他節點D1S2、D1S3、D1S4的變異值，然後進行步驟S400；或是再驅動驅動電極D2後，依序求出第一節點D2S1的第一量測值分別與其他節點D2S2、D2S3、D2S4的變異值，再進行步驟S400。 Step S300: Comparing the measured value of each point on the same driving electrode with a variation value of the first measured value. In the first embodiment shown in FIG. 2, in step S200, after driving the driving electrode D1, the first measurement value of the first node D1S1 and the variation values of the other nodes D1S2, D1S3, and D1S4 are sequentially obtained, respectively, Then go to step S400; or after driving the driving electrode D2 again, sequentially obtain the variation values of the first measurement value of the first node D2S1 and the other nodes D2S2, D2S3, D2S4, and go to step S400.

步驟S400：檢查步驟S300所得到的變異值是否高於或低於感設模組所設定的一閾限值。上述感測電極所感應的量測值是週期波驅動所產生之變異，利用步驟S300-S400再比較二者的差異。當無指向物件如手 指或觸控筆等觸碰感測模組時，若感測模組要判別是否有其他異物觸碰，則是進行週期波驅動變異衰減比較，因其感應量測值會被觸碰或其他異物等非指向物件(例如水漬)造成衰減，因此上述步驟是為了觀察判斷此衰減是否由非指向物件所引起。若變異值高於閾限值，則判斷有指向物件觸碰第一感測電極。若變異值低於閾限值，則判斷一非指向物件觸碰第一感測電極。 Step S400: Check whether the variation value obtained in step S300 is higher or lower than a threshold value set by the sensing module. The measurement value sensed by the above-mentioned sensing electrodes is the variation generated by the periodic wave driving, and the difference between the two is compared by using steps S300-S400. When a non-pointing object such as a finger or a stylus touches the sensing module, if the sensing module needs to determine whether there is another foreign object touching, it will compare the periodic wave drive variation attenuation, because the sensing measurement value will be The attenuation is caused by non-pointing objects such as touch or other foreign objects (such as water stains), so the above steps are to observe and determine whether the attenuation is caused by non-pointing objects. If the variation value is higher than the threshold value, it is determined that a pointing object touches the first sensing electrode. If the variation value is lower than the threshold value, it is determined that a non-pointing object touches the first sensing electrode.

步驟S500：若變異值高於或低於閾限值，則判斷該點量測值上所在的感測電極為異常。如圖3所示，由於節點D1S2及D4S3分別與第一節點D1S1及D4S1的變異值高於或低於閾限值，因此判斷感測電極S2及S3皆為異常。至於圖4所示，由於節點區225AS2及225CS4分別與第一節點225AS1及225CS1的變異值高於或低於閾限值，因此判斷感測電極S2及S4皆為異常。 Step S500: If the variation value is higher or lower than the threshold value, it is determined that the sensing electrode on which the measurement value of the point is located is abnormal. As shown in FIG. 3 , since the variation values of the nodes D1S2 and D4S3 and the first nodes D1S1 and D4S1 respectively are higher or lower than the threshold value, it is determined that the sensing electrodes S2 and S3 are both abnormal. As shown in FIG. 4 , since the variation values between the node regions 225AS2 and 225CS4 and the first nodes 225AS1 and 225CS1 are higher or lower than the threshold value, it is determined that the sensing electrodes S2 and S4 are both abnormal.

步驟S600：承續步驟S500，同時當至少一個變異值高於或低於閾限值時，停止一觸控量測。在一較佳實施例中，感測電極被判斷為異常的數量為至少兩個，則停止觸控量測。 Step S600: Continue to step S500, and stop a touch measurement when at least one variation value is higher or lower than the threshold value. In a preferred embodiment, when the number of the sensing electrodes determined to be abnormal is at least two, the touch measurement is stopped.

當判斷第一感測電極遭到手指觸碰或是有異物於其上時，先前所獲得節點的量測值訊號，則以新讀的點量測值，覆蓋舊讀的點量測值；或是可直接將舊的點量測值丟棄不使用。 When judging that the first sensing electrode is touched by a finger or has a foreign object on it, the previously obtained measurement value signal of the node is used to overwrite the old read point measurement value with the newly read point measurement value; Or you can directly discard the old point measurement value and not use it.

步驟S700：承續步驟S600，選定複數個感測電極中的另一者作為第一感測電極並設為反向量測。重複上述步驟S100-S600，以重新執行判斷程序。 Step S700: Continuing from Step S600, select another one of the plurality of sensing electrodes as the first sensing electrode and set it to reverse measurement. The above steps S100-S600 are repeated to re-execute the judgment procedure.

上述感測方法的判斷程序可以採用週期性檢測或即時性檢 測。若採用週期性檢測，則執行數次觸控量測後，執行一次此判斷程序，來掃描全面板，以確認被選定作為反向量測的感測電極是否適當；若採用即時性檢測，則觸控量測下的每次週期波變異衰減比較後即進行判斷。每次取得節點訊號進行週期波變異衰減比較時，先將變異值依觸控系統所設條件判斷作為反向量測的第一感測電極是否遭觸碰，再進行其他訊號處理或判斷，例如報點。 The judgment procedure of the above-mentioned sensing method can adopt periodic detection or instant detection. If periodic detection is used, after several touch measurements are performed, the judgment procedure is performed once to scan the full panel to confirm whether the sensing electrodes selected as reverse measurement are appropriate; if immediate detection is used, then The judgment is made after each periodic wave variation attenuation under touch measurement is compared. Each time a node signal is obtained for periodic wave variation attenuation comparison, the variation value is first determined according to the conditions set by the touch system to determine whether the first sensing electrode used as the reverse measurement is touched, and then other signal processing or judgment is performed, such as Report points.

步驟S510：接續步驟S400，若變異值未高於或低於閾限值，或是感測電極為異常的數量未達兩個時，則進行觸控量測。在本實施例中，除了將感測電極S1電性連接至一反向量測電路，觸控量測更包括：電性連接複數個感測電極之其餘者至一正向量測電路，並進行觸控量測而得到一觸控訊號。進行觸控量測之步驟包括：反向量測電路依序會同正向量測電路進行量測，分別同步得到一反向訊號及一正向訊號；以及，通過一類比數位轉換電路接收反向訊號及正向訊號，來轉換得到一觸控訊號，其中，正向訊號與反向訊號的相位訊號是180度偏移。 Step S510 : Continuing with step S400 , if the variation value is not higher or lower than the threshold value, or the number of abnormal sensing electrodes is less than two, perform touch measurement. In this embodiment, in addition to electrically connecting the sensing electrode S1 to a reverse measurement circuit, the touch measurement further includes: electrically connecting the rest of the plurality of sensing electrodes to a forward measurement circuit, and A touch signal is obtained by performing touch measurement. The step of performing the touch measurement includes: the reverse measurement circuit and the forward measurement circuit perform measurement in sequence, and respectively obtain a reverse signal and a forward signal synchronously; and receive the reverse signal through an analog-to-digital conversion circuit The signal and the forward signal are converted to obtain a touch signal, wherein the phase signals of the forward signal and the reverse signal are shifted by 180 degrees.

本發明實施例提供一種觸控辨識裝置之感測方法及其感測模組，通過週期性或即時性穿插執行一判斷程序於執行感測方法的週期波變異衰減比較運算中，可以判斷觸控訊號讀取時有無異物位於觸控辨識裝置上的感測方法及其感測模組，來提高整體感測精確度。 Embodiments of the present invention provide a sensing method of a touch recognition device and a sensing module thereof. By periodically or instantaneously executing a judgment program in the periodic wave variation attenuation comparison operation of the sensing method, the touch control can be judged. A sensing method and a sensing module for the presence or absence of foreign objects on a touch recognition device during signal reading to improve the overall sensing accuracy.

S100-S700‧‧‧步驟 S100-S700‧‧‧Steps

Claims (13)

一種觸控辨識裝置之感測方法，其中該觸控辨識裝置包括複數個感測電極及複數個驅動電極，其中該複數個感測電極與該複數個驅動電極交會而具有複數個節點，該感測方法包括以下步驟：選定該複數個感測電極中的一第一感測電極，並將該第一感測電極設為反向量測，其中該第一感測電極與該複數個驅動電極交會而具有複數個第一節點，將該第一感測電極設為反向量測的步驟包括將該第一感測電極電性連接至一反向量測電路，電性連接該複數個感測電極之其餘者至一正向量測電路；驅動一個或一個以上該驅動電極，並量測該第一感測電極以得到一個或一個以上該第一節點的一第一量測值，再量測該第一感測電極以外的其他該感測電極，以得到該複數個節點的複數個點量測值；比較同一個該驅動電極上的每一該點量測值分別與該第一量測值的一變異值；檢查該變異值是否高於或低於一閾限值；若該變異值高於或低於該閾限值，則判斷該點量測值上所在的該感測電極為異常；以及，當至少一個該變異值高於或低於該閾限值時，停止一觸控量測。 A sensing method of a touch recognition device, wherein the touch recognition device includes a plurality of sensing electrodes and a plurality of driving electrodes, wherein the plurality of sensing electrodes and the plurality of driving electrodes intersect to have a plurality of nodes, and the sensing The detection method includes the following steps: selecting a first sensing electrode in the plurality of sensing electrodes, and setting the first sensing electrode as reverse measurement, wherein the first sensing electrode and the plurality of driving electrodes There are a plurality of first nodes intersected to form a plurality of first nodes. The step of setting the first sensing electrode to reverse measurement includes electrically connecting the first sensing electrode to a reverse measurement circuit, and electrically connecting the plurality of sensing electrodes. The rest of the measurement electrodes are sent to a positive vector measurement circuit; one or more of the driving electrodes are driven, and the first sensing electrodes are measured to obtain a first measurement value of one or more of the first nodes, and then measuring the other sensing electrodes other than the first sensing electrode to obtain a plurality of point measurement values of the plurality of nodes; comparing each point measurement value on the same driving electrode with the first A variation value of the measurement value; check whether the variation value is higher or lower than a threshold value; if the variation value is higher or lower than the threshold value, determine the sensing point on the measurement value The electrodes are abnormal; and when at least one of the variation values is higher or lower than the threshold value, a touch measurement is stopped. 如申請專利範圍第1項所述的感測方法，其中該感測電極被判斷為異常的數量為至少兩個，則停止該觸控量測。 The sensing method of claim 1, wherein the number of the sensing electrodes determined to be abnormal is at least two, and the touch measurement is stopped. 如申請專利範圍第1項所述的感測方法，其中若該變異值未高於或低於該閾限值，或是該感測電極為異常的數量未達兩個時，則進行該觸控量測。 The sensing method as described in item 1 of the claimed scope, wherein if the variation value is not higher or lower than the threshold value, or the number of the sensing electrodes that are abnormal is less than two, the sensing is performed. Control measurement. 如申請專利範圍第1項所述的感測方法，其中得到該第一量測值及該複數個點量測值之步驟更包括：驅動該複數個驅動電極的其一者或一部份者；量測該第一感測電極以得到一個或一個以上該第一節點的該第一量測值，再同時或依序量測該第一感測電極以外的其他該感測電極，以得到該複數個點量測值的一者或一部份者；停止驅動；驅動該複數個驅動電極的另一者或其餘部分者；量測該第一感測電極以得到一個或一個以上該第一節點的該第一量測值，再同時或依序量測該第一感測電極以外的其他該感測電極，以得到該複數個點量測值的另一者或其餘部分者；以及，重複上述驅動動作，以得到全部的該複數個點量測值及該複數個第一量測值。 The sensing method as described in claim 1, wherein the step of obtaining the first measurement value and the plurality of point measurement values further comprises: driving one or a part of the plurality of driving electrodes ; measure the first sensing electrode to obtain the first measurement value of one or more of the first nodes, and then simultaneously or sequentially measure the other sensing electrodes other than the first sensing electrode to obtain One or a part of the plurality of point measurement values; stop driving; drive the other or the rest of the plurality of driving electrodes; measure the first sensing electrode to obtain one or more of the first The first measurement value of a node, and then simultaneously or sequentially measuring the other sensing electrodes other than the first sensing electrode to obtain the other or the rest of the plurality of point measurement values; and , and repeat the above driving action to obtain all the plurality of point measurement values and the plurality of first measurement values. 如申請專利範圍第1項所述的感測方法，其中得到該第一量測值及該複數個點量測值之步驟更包括：同時驅動該複數個驅動電極的全部者；以及，量測該第一感測電極以得到全部的該第一節點的該第一量測值，再同時 量測該第一感測電極以外的其他該感測電極，以得到全部的該複數個點量測值。 The sensing method as described in claim 1, wherein the step of obtaining the first measurement value and the plurality of point measurement values further comprises: simultaneously driving all of the plurality of driving electrodes; and, measuring the first sensing electrode to obtain the first measurement value of all the first nodes, and at the same time The other sensing electrodes other than the first sensing electrode are measured to obtain all the measurement values of the plurality of points. 如申請專利範圍第1項所述的感測方法，更包括：選定該複數個感測電極中的另一者作為該第一感測電極，以將該第一感測電極設為反向量測。 The sensing method as described in claim 1, further comprising: selecting another one of the plurality of sensing electrodes as the first sensing electrode, so as to set the first sensing electrode as an inverse amount Measurement. 如申請專利範圍第1項所述的感測方法，其中將該第一感測電極設為反向量測的步驟包括一處理單元在此量測循環將經由該第一感測電極所收到的訊號進行反向處理。 The sensing method as described in claim 1, wherein the step of setting the first sensing electrode to reverse measurement includes a processing unit in which the first sensing electrode will receive the signal received through the first sensing electrode during the measurement cycle. The signal is processed in reverse. 如申請專利範圍第3項所述的感測方法，其中該觸控量測之步驟包括：該反向量測電路依序會同該正向量測電路進行量測，分別同步得到一反向訊號及一正向訊號；以及，通過一類比數位轉換電路接收該反向訊號及該正向訊號，來轉換得到一觸控訊號，其中，該正向訊號與該反向訊號的相位訊號是180度偏移。 The sensing method according to claim 3, wherein the touch measurement step comprises: the reverse measurement circuit and the forward measurement circuit perform measurements in sequence, and obtain a reverse signal synchronously respectively. and a forward signal; and receiving the reverse signal and the forward signal through an analog digital conversion circuit to convert to obtain a touch signal, wherein the phase signal of the forward signal and the reverse signal is 180 degrees offset. 如申請專利範圍第1項所述的感測方法，其中若該變異值高於該閾限值，則判斷有一指向物件觸碰該第一感測電極。 The sensing method according to claim 1, wherein if the variation value is higher than the threshold value, it is determined that a pointing object touches the first sensing electrode. 如申請專利範圍第1項所述的感測方法，其中若該變異值低於該閾限值，則判斷一非指向物件觸碰該第一感測電極。 The sensing method of claim 1, wherein if the variation value is lower than the threshold value, it is determined that a non-pointing object touches the first sensing electrode. 一種觸控辨識裝置之感測模組，包括： 複數個感測電極，包括一設為反向量測的第一感測電極，其中該第一感測電極電性連接至一反向量測電路，該複數個感測電極之其餘者電性連接至一正向量測電路；複數個驅動電極，與該複數個感測電極交會而具有複數個節點，與該第一感測電極交會而具有複數個第一節點；以及，一處理單元，電性連接該該複數個驅動電極及複數個感測電極，用以驅動一個或一個以上驅動電極，量測第一感測電極以得到一個或一個以上第一節點的一第一量測值，再量測第一感測電極以外的其他感測電極，以得到該複數個節點的複數個點量測值；其中，該處理單元比較同一個該驅動電極上的每一該點量測值分別與每一該第一量測值的一變異值；該處理單元檢查該變異值是否高於或低於一閾限值；若該變異值高於或低於該閾限值，則該處理單元判斷該點量測值上的該感測電極為異常；以及，當至少一個該變異質高於或低於該閾限值，該處理單元停止一觸控量測。 A sensing module of a touch recognition device, comprising: A plurality of sensing electrodes, including a first sensing electrode set for reverse measurement, wherein the first sensing electrode is electrically connected to a reverse measurement circuit, and the rest of the plurality of sensing electrodes are electrically connected connected to a positive vector sensing circuit; a plurality of driving electrodes intersecting with the plurality of sensing electrodes to have a plurality of nodes, and a plurality of first nodes intersecting with the first sensing electrodes; and a processing unit, electrically connecting the plurality of driving electrodes and the plurality of sensing electrodes for driving one or more driving electrodes, and measuring the first sensing electrodes to obtain a first measurement value of one or more first nodes, Then measure other sensing electrodes other than the first sensing electrode to obtain a plurality of point measurement values of the plurality of nodes; wherein, the processing unit compares each of the point measurement values on the same driving electrode respectively. with a variation value of each of the first measurement values; the processing unit checks whether the variation value is higher or lower than a threshold value; if the variation value is higher or lower than the threshold value, the processing unit Determining that the sensing electrode on the measurement value at the point is abnormal; and, when at least one of the aberrations is higher or lower than the threshold value, the processing unit stops a touch measurement. 如申請專利範圍第11項所述的感測模組，其中若該變異值未高於或低於該閾限值，或是該感測電極為異常的數量未達兩個時，則該處理單元進行該觸控量測。 The sensing module of claim 11, wherein if the variation value is not higher or lower than the threshold value, or the number of abnormal sensing electrodes is less than two, the processing The unit performs the touch measurement. 如申請專利範圍第12項所述的感測方法，其中該處理單元進行該觸控量測包括： 該反向量測電路依序會同該正向量測電路進行量測，分別同步得到一反向訊號及一正向訊號；以及，通過一類比數位轉換電路接收該反向訊號及該正向訊號，來轉換得到該觸控訊號，其中，該正向訊號與該反向訊號的相位訊號是180度偏移。 The sensing method of claim 12, wherein the processing unit performing the touch measurement comprises: The reverse measurement circuit performs measurements in sequence with the forward measurement circuit to obtain a reverse signal and a forward signal synchronously, respectively; and receives the reverse signal and the forward signal through an analog-to-digital conversion circuit , to convert the touch signal to obtain the touch signal, wherein the phase signal of the forward signal and the reverse signal are shifted by 180 degrees.
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