201248471 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種觸控裝置及其觸控感測方法，且 特別是有關於一種可消除低頻雜訊的觸控裝置及其觸控感 測方法。 【先前技術】 為使可摟式的資訊產品具有更人性化的使用介面，整 合觸控式面板(Touch panel)或觸控墊(Touch pad)已經蔚為 潮流。相關的面板大廠、1C設計公司都已經將觸控式面板 的技術列為主要的研發項目，相關的技術與產品也已經應 用於曰常生活的電子產品中，例如行動電話、電腦及個人 行動助理等資訊產品。 目前最常使用的觸控裝置主要分為電阻式(resistive) ，電容式(capacitive)，其中電容式觸控裝置主要工作原理 是感應一種稱為電容的電性特性。當兩層電性 俨 觸碰而互相靠近時，它們的電場就會互相作用不 觸控板結構中的上下層表面分別是由交錯方向的電極線路 所形成之導電層。手指也是一個電性導體，當手指放置在 觸控板上，在觸控板的電極線路和手指之間就會形成一個 極小的電容。藉由電容值改變由微處理器來偵 觸碰之位f。 Μ遭用者所 由於電容式觸控裝置容易受到環境變化的影塑， 手指或其它物件觸碰時所產生的低頻雜訊，進而^電子^ 201248471 置產生誤判並造成電源的浪費。 【發明内容】 本發明提供一種觸控褽置及其觸控感測方法，可有效 去除感測訊號中的低頻雜訊，例如手指雜訊(finger noise) 或其它碰觸物件所導致的低頻雜訊。 。。本發明提出一種觸控裝置，包括一感測線、一第一觸 才工單元、一第一觸控單元、一感測模組以及一控制單元。 其中感測線設置於-觸控面板上。第—觸控單元設置於觸 控面板上且1¾接至感測線，其中於―第—線掃描期間第一 觸控單元伽動。第二觸控單元設置於馳面板上且轉接 至感測線’其中於-第二線掃描期間第二觸控單元被驅 動。感測模_接感測線，其中感測模組於第—線掃描期 間透過感測線偵測第一觸控單元以輸出一第一原始訊號 感測模組於第二線掃描期間透過感測線偵測第二觸控單元 以輸出一第二原始訊號。控制單元耦接感測模組，依據第 二原始訊號求出-參考訊號’以及將第—原始訊號減去參 考訊號以獲得第一觸控單元的感測訊號。. 在本發明之一實施例中，上述觸控裝置，更包括一第 三觸=單元’其設置於觸控面板上絲接至感測線，第三 觸控單it於-第二線掃描期間被驅動。其巾感測模組於 三線掃描期間透過感測線偵測第三觸控單元以輸出—第二 原始訊號，以及控制單元依據第二原始訊號盘第三 號求出參考訊號。 以 201248471 在本發明之一實施例中，上述控制單元計算第二原始 訊號與第三原始訊號的平均值或加權平均值以做為參考訊 號。 ‘ 在本發明之一實施例中，上述觸控裴置，更包括多個 第三觸控單元，設置於觸控面板上且耦接至感測線。其中 第一觸控單元、第二觸控單元與上述多個第三觸控單元各 自於不同線掃描期間被驅動。感測模組透過感測線於所述 不同線掃描期間分別偵測上述多個第三觸控單元以輸出多 個第二原始訊號。控制單元依據第二原始訊號與上述多個 第三原始訊號求出參考訊號。 在本發明之一實施例中，上述控制單元計算第二原始 λ號與上述多個第二原始訊號的平均值或加權平均值以做 為參考訊號。 在本發明之一實施例中，上述第一觸控單元包含一第 一感測電容，第一感測電容之一端耦接至一第一掃描線， f一端則耦接至感測線。第二觸控單元包含一第二感測電 容，第二感測電容之一端耦接至一第二掃描線，另一端則 耦接至感測線。 —在本發明之一實施例中，上述感測模組包括一第一電 谷以及一運算放大器。其中運算放大器的反相輸入端耦接 •^第-電容的第一端與感測線’運算放大器的非反相輸入 ，耗接至—參考電壓，運算放A||的輸出端減至第一電 容的第二端以及控制單元。 本發明亦提出一種觸控裝置的雜訊消除方法，其中觸 201248471 控裝ΐ包括—感測線、-第-觸控單元以及-第二觸控單 =單2消除方法包括：於—第—線掃描期間驅動第二觸 :?得:第-原始訊號。於-第二線掃描期間驅^ 二二：第一線掃描期間透過感測線偵測第二觸控單元 Γ將縣訊號。依據第三壯1魏求出—參考訊 號原始訊料去參考減，以獲得第—觸控單元 控單實施例中，上述第—觸控單元與第二觸 線掃描期間二J彳=:接f述第-咖期間與第二 在本發明之—實施例中，上述參考訊號為第二原始訊 號。 ，本發明之一實施例中，上述觸控裝置更包括一第三 觸控單元，雜訊消除方法更包括：於一第三線掃描期間驅 動第二觸控單元。於第三線掃描期間透過感測線偵測第三 觸控單元以獲得一第三原始訊號。依據第二原始訊號與第 二原始sfl號求出參考訊號。 在本發明之一實施例中，上述依據第二原始訊號與第 三原始訊號求出參考訊號之步驟包括：計算第二原始訊號 與第二原始sfl號的平均值或加權平均值。以戶斤述平均值或 加權平均值做為參考訊號。 在本發明之一實施例中，上述觸控裝置更包括多個第 201248471 三觸控單元，雜訊消除方法更包括：於不同線掃描期間分 別驅動上述多個第三觸控單元。於所述不同線掃描期間透 過感測線分別偵測上述多個第三觸控單元以輸出多個第三 原始訊號。依據第二原始訊號與上述多個第三原始訊號求 出參考訊號。 在本發明之一實施例中，上述依據第二原始訊號與上 述多個第二原始訊號求出參考訊號之步驟包括：計算第二 原始訊號與上述多個第三原始訊號的平均值或加權平均 值。以所述平均值或加權平均值做為參考訊號。 在本發明之一實施例中，上述第一觸控單元包含一第 -感測電容，以及第二觸控單元包含一第二感測電容。 基於上述，本發明於不同掃描期間偵測掃描線上的觸 控單元而得到-第-原始訊號與-第二原始訊號= 性 仏=—原始訊號中所包含的低頻雜訊而= ,.I 感測訊號，進而提高判斷觸控位置的正確 下文特 【實施方式】 參照狀顺❹的示意圖 ㈣ς, C 包括n條掃描線P1〜Pn、m 4 Μ、多個觸控單元㈣、—驅動模組1〇1 201248471 感測模組102以及一控制單元1〇4，其中掃描線^〜如與 感測線S1〜Sm設置於一觸控面板1〇6上，觸控單元τ(χ，力 代表位於# X條掃描線與第y佩麟蚊處的觸控單 元，n、m、x、y為正整數，且另外， 感測模組102耦接感測線si〜Sm以及控制單元1〇4。 感測線S1上的觸控單元取山可分別接收驅動訊號 DbDn而在不同的線掃描期間被驅動。舉例來說，圖2繪 示=本發明-實施例之各掃描線ρι~ρη的驅動訊號的波形 不意圖。請參照ϋ 2’其中各倘驅動訊號m〜Dn的低 期間即為對應的各條掃描線P1〜Pn的線掃描期間，例㈣ 動織m的低準位期，為掃摇線ρι的線掃描期間 ，駆動喊D2的低準位期間即為掃描線p2的線掃描 期間LS2 ’其餘依此類推。在掃描線ρι上的所有觸^單元 LS1 電準位的肩被驅動（或開啟，tum 上的所有觸控單元则〜T(2，m)則於線掃物 ⑽)。類似地，其匕知描㈣，上的觸控單 ，==”_==的(：_ 實施細節。其他感實施例的 說明—他在各條掃描線^ 201248471 Ρ1〜Ρη μ觸控單 ^1)、…，·2，1)、^1，1)、^)，以輸出多個原始 訊號STW)。例如，感測模组1〇2在掃描線ρι的線掃描 期間LSI ϋ過感測線S1仙觸控單元叫)而輸出 -原始訊號ST(1，1) ’而在掃描線P2的線掃描期間敗透 過感測線S1 _觸控單元τ(2，1}而輸出—第二原始訊 ST(2，1)。類似地，在其它掃描線Ρ3〜Ρη的線掃描期間 LS3〜LSn感測模組102亦分別偵測感測線S1上對應的觸201248471 VI. Description of the Invention: [Technical Field] The present invention relates to a touch device and a touch sensing method thereof, and more particularly to a touch device capable of eliminating low frequency noise and a touch feeling thereof Test method. [Prior Art] In order to make the portable information product have a more user-friendly interface, a touch panel or a touch pad has become a trend. Relevant panel manufacturers and 1C design companies have listed touch panel technology as the main R&D project. Related technologies and products have also been applied to everyday electronic products such as mobile phones, computers and personal actions. Assistant and other information products. At present, the most commonly used touch devices are mainly divided into resistive and capacitive. The main working principle of the capacitive touch device is to induce an electrical property called a capacitor. When two layers of electrical 触 touch each other and close to each other, their electric fields interact with each other. The upper and lower surfaces of the touch panel structure are respectively conductive layers formed by the electrode lines in the staggered direction. The finger is also an electrical conductor. When the finger is placed on the touchpad, a very small capacitance is formed between the electrode line of the touchpad and the finger. The bit f is detected by the microprocessor by the change in the capacitance value. Μ The user is vulnerable to environmental changes, the low-frequency noise generated by the touch of fingers or other objects, and the electronic ^ 201248471 is misjudged and wastes power. SUMMARY OF THE INVENTION The present invention provides a touch device and a touch sensing method thereof, which can effectively remove low frequency noise in a sensing signal, such as finger noise or other low frequency impurities caused by touching objects. News. . . The present invention provides a touch device including a sensing line, a first touch processing unit, a first touch unit, a sensing module, and a control unit. The sensing line is disposed on the touch panel. The first touch unit is disposed on the touch panel and is connected to the sensing line, wherein the first touch unit is gambling during the “first” line scan. The second touch unit is disposed on the touch panel and transferred to the sensing line' wherein the second touch unit is driven during the second line scan. The sensing module is connected to the sensing line, wherein the sensing module detects the first touch unit through the sensing line during the first line scanning to output a first original signal sensing module through the sensing line during the second line scanning period. The second touch unit is tested to output a second original signal. The control unit is coupled to the sensing module, and the reference signal is obtained according to the second original signal, and the reference signal is subtracted from the first original signal to obtain the sensing signal of the first touch unit. In one embodiment of the present invention, the touch device further includes a third touch=unit disposed on the touch panel and wired to the sensing line, and the third touch unit is in the second line scan period. driven. The towel sensing module detects the third touch unit through the sensing line during the three-line scanning to output the second original signal, and the control unit obtains the reference signal according to the third original signal disk. In an embodiment of the present invention, the control unit calculates an average or weighted average of the second original signal and the third original signal as a reference signal. In one embodiment of the present invention, the touch control device further includes a plurality of third touch units disposed on the touch panel and coupled to the sensing line. The first touch unit, the second touch unit, and the plurality of third touch units are each driven during different line scans. The sensing module detects the plurality of third touch units during the different line scans through the sensing line to output a plurality of second original signals. The control unit determines the reference signal according to the second original signal and the plurality of third original signals. In an embodiment of the invention, the control unit calculates an average or weighted average of the second original λ number and the plurality of second original signals as reference signals. In one embodiment of the present invention, the first touch unit includes a first sensing capacitor. One end of the first sensing capacitor is coupled to a first scan line, and one end of the f is coupled to the sensing line. The second touch unit includes a second sensing capacitor. One end of the second sensing capacitor is coupled to a second scan line, and the other end is coupled to the sensing line. In one embodiment of the invention, the sensing module includes a first valley and an operational amplifier. The inverting input terminal of the operational amplifier is coupled to the first end of the first capacitor and the non-inverting input of the sense line 'operational amplifier, and is connected to the reference voltage, and the output of the operational amplifier A|| is reduced to the first The second end of the capacitor and the control unit. The invention also provides a noise cancellation method for a touch device, wherein the touch control system includes: a sense line, a - touch unit, and a second touch sheet = single 2 elimination method including: a - line The second touch is driven during the scan: get: first-original signal. During the second line scan, the second touch unit is detected through the sensing line during the first line scan. According to the third strong 1 Wei, the reference signal raw material is referred to the reference subtraction to obtain the first touch unit control single embodiment, wherein the first touch unit and the second touch line scan period are two J:= In the embodiment of the present invention, the reference signal is the second original signal. In one embodiment of the present invention, the touch device further includes a third touch unit, and the noise canceling method further includes: driving the second touch unit during a third line scan. The third touch unit is detected through the sensing line during the third line scan to obtain a third original signal. The reference signal is obtained according to the second original signal and the second original sfl number. In an embodiment of the invention, the step of determining the reference signal according to the second original signal and the third original signal comprises: calculating an average value or a weighted average value of the second original signal and the second original sfl number. The household average or weighted average is used as the reference signal. In one embodiment of the present invention, the touch device further includes a plurality of 201248471 three-touch units, and the noise cancellation method further includes: driving the plurality of third touch units separately during different line scans. The plurality of third touch units are respectively detected through the sensing lines during the different line scans to output a plurality of third original signals. And determining a reference signal according to the second original signal and the plurality of third original signals. In an embodiment of the present invention, the step of determining the reference signal according to the second original signal and the plurality of second original signals includes: calculating an average or weighted average of the second original signal and the plurality of third original signals value. The average value or the weighted average value is used as a reference signal. In an embodiment of the invention, the first touch unit includes a first sensing capacitor, and the second touch unit includes a second sensing capacitor. Based on the above, the present invention detects the touch unit on the scan line during different scans to obtain a -first-origin signal and a second original signal=sex 仏=-the low-frequency noise included in the original signal =, .I sense The test signal is used to improve the correct position of the touch position. [Embodiment] The schematic diagram of the reference pattern (4) ς, C includes n scan lines P1 PPn, m 4 Μ, multiple touch units (four), - drive module 1〇1 201248471 The sensing module 102 and a control unit 1〇4, wherein the scanning line ^~ is connected to the sensing line S1~Sm on a touch panel 1〇6, the touch unit τ (χ, the force representative is located The sensing unit 102 is coupled to the sensing lines si to Sm and the control unit 1〇4. The sensing unit 102 is coupled to the sensing lines si to Sm and the sensing unit 102 is a positive integer. The touch unit on the sensing line S1 can receive the driving signal DbDn and be driven during different line scanning. For example, FIG. 2 shows the driving signals of the scanning lines ρι ρη of the present invention. The waveform is not intended. Please refer to ϋ 2' where each of the driving signals m~Dn is low. During the line scan period of each of the scanning lines P1 to Pn, the low-level period of the (4) moving fabric m is the line scanning period of the sweeping line ρι, and the low-level period of the shouting D2 is the line of the scanning line p2. During the scan, LS2 'the rest and so on. The shoulders of all the touch units LS1 on the scan line ρ1 are driven (or turned on, all touch units on the tum are ~T(2,m) on the line sweep (10)) Similarly, the 匕 描 ( (4), on the touch list, == _ == (: _ implementation details. Description of other sense embodiments - he is on each scan line ^ 201248471 Ρ 1 ~ Ρ μ touch single ^1),...,·2,1), ^1,1), ^) to output a plurality of original signals STW). For example, the sensing module 1〇2 scans the line of the scanning line ρι During the period, during the line scan of the scan line P2, the LSI passes through the sense line S1 _ touch unit τ (2, 1} while the LSI passes the sense line S1 and touches the touch unit. Output - second original signal ST (2, 1). Similarly, during the line scan of the other scan lines Ρ 3 Ρ Ρ η, the LS3 LS LS sensing module 102 also detects the corresponding touch on the sensing line S1
控單元T(3，l)〜T(n，l)而輸出對應的原始訊號 ST(3，1)〜ST(n，l)。 ,U 控制單元104在接收到感測模組1〇2的原始訊號 ST(1，1)〜ST(n，l)後，便依據此些原始訊號求出一參考訊 號。例如，於此些原始訊號ST(1，1)〜ST(n,l)中選擇一個原 始訊號做為參考訊號’在此可選擇將上述的第二原始訊號 ST(2，1)做為參考訊號。在擇定參考訊號後，控制單元ι〇4 另外更將第一原始訊號ST(1,1)減去參考訊號(亦即第二原 始訊號ST(2，1))，以去除第一原始訊號ST(1，1)中所包含的 低頻雜訊而獲得觸控單元T(l,l)的感測訊號。類似地其它 觸控單元T(2，l)〜Τ(η，1)的感測訊號亦可以利用相同的方式 獲得’在此不再贅述。 於本實施例中，控制單元104可以利用在時間上相鄰 接的兩個原始訊號彼此相減，以進行雜訊消除（noise cancellation)。例如，線掃描期間LSI與LS2在時間上相 鄰接，因此線掃描期間LS2的原始訊號ST(2，1)可以作為 201248471 線掃描期間LSI的原始訊號ST(1，1)的參考訊號。控制單 元104可以將線掃描期間LSI的第一原始訊號ST(1 1)減 去參考訊號(亦即ST(1，1)-ST(2，1)) ’以獲得觸控單元τ(ι 1) 的感測訊號。以此類推，例如觸控單元Tq，〗）的感測訊號 為ST(2，1)-ST(3，1)，而觸控單元T(n·。）的感測訊號為 ST(n-2，l)-ST(n-l，l)。於其他實施例中，第一原始訊號 ST(1，1)可以作為第一原始訊號ST(2，1)的泉考n虎。控制單 元丨。"以將第二原始訊號δτ(2，υ減去:二： ST(2，1)-ST(1，1)) ’以獲得觸控單元τ(2，1}的感測訊號。以 此類推，例如觸控單元T(n_u)的感測訊號為 STKUVSTXn-U)’而觸控單元的感測訊號為 ST(n,l)-ST(n-l,l)。 又或者，控制單it 104彳以利用在空間上相鄰接的兩 侧控單元_始減彼此彳嗔，叫行雜減除。例如， 觸控單元T(U)與T⑼在空間上相鄰接，因此觸控單元 丁⑽的原始訊號stw)可以作為觸控單元τ(ι丨)的參考 訊號。控制科KM可以將觸控單元T(u)的第一原始訊 號ST(U)減去參考訊號(亦即冲收如)），以獲得觸 控單元T(u)的感測訊號。以此_，例如觸 的感測訊號為靴明卿），__ _ 訊號為STMD-swu)。於其他實施例中，觸控單元 τ(1，υ的原始訊號STXU)可以作為觸控單元 的參考 =控:單元則以將觸控單元的原始訊號減 去參考訊號(亦即SMDKU))’叫得觸 201248471 的感測訊號。以此類推，例如觸控單元只仏丨’”的感測訊 號為STd^D-sixm)，而觸控單元丁⑽的感測訊號為 ST(n,l)-ST(n-l,l) 〇 另外，感測線S1上觸控單元Τ(χ，υ的感測訊號求得方 式亦可類推至其它感測線S2〜sm上觸控單元 T(x，2)〜T(x，m)，例如感測模組1〇2可偵測各條感測線 S2〜Sm上的觸控單元τ(χ，2)〜T(x，m)而輸出多個原始訊號 ST(x，2)〜ST(x，m)，進而求出對應的參考訊號與感測訊號， 其細節在此亦不再贅述。 藉由去除各個觸控單元原始訊號的低頻雜訊而獲得 對應的感測訊號後，感測訊號中剩下的高頻雜訊則可利用 低通濾波器、數位訊號處理器（Digital Signal Pr〇cess〇r, DSp) 濾波器（未繪示）來濾除。如此，控制單元104便可依據去 除咼頻雜訊與低頻雜訊後的感測訊號求出正確的觸控位 置。 值得注意的是，驅動訊號D1〜Dn的波形亦不限定為 如圖2的驅動波形，亦即掃描線pl〜pn並不限定要依照 PI ' P2 '…' ρη_2、ρη_ι、pn的順序而被致能。舉例來說， 亦可先驅動/致能奇數條的掃描線(例如P1、p3、…），再驅 動/致能偶數條的掃描線(例如P2、…）。於此例中，觸控單 元丁(1，1}的原始訊號ST(1，1)與觸控單元T(3，l)的原始訊號 ST(3，1)在時間上相鄰接，.因此原始訊號sTpj)可以作為原 始訊號ST(1，1)的參考訊號。控制單元104可以將觸控單元 T(1，U的原始訊號減去參考訊號(亦即ST(1，1) - ST(3,1))， § 11 201248471 以獲得觸控單元τ(1，1)的感測訊號。以此類推可以求得其 餘觸控單元的感測訊號。於其他實施例中，第一原始訊號 ST(1,1)可以作為第三原始訊號ST(3，1)的參考訊號。控制單 元104可以將第三原始訊號ST(3,1)減去參考訊號（亦即 ST(3，1)-ST(1，1)) ’以獲得觸控單元T(2,l)的感測訊號。 又或者是，參考訊號可依據二個或更多個線掃描期間 所產生的原始祝號求出。舉例來說，控制單元1 〇4可將觸 控單元T(2，l)〜T(3，l)對應的原始訊號ST(2，1)〜ST(3，1)的平 均值或加權平均值做為觸控單元T(l，l)的參考訊號，而求 得觸控單元T(l，l)的感測訊號，例如為_ [§τ(2 1) + ST(3，l)]/2，而觸控單元 T(n-2,1)的感測tfL號為8丁(11_2，1)-[ST(n-l’l) + ST(n，l)]/2。或是，控制單元1〇4將觸控單元 T(l，l)〜T(2，l)的原始訊號ST(1，1)〜ST(2，1)的平均值或加權 平均值做為觸控單元T(3,l)的參考訊號，而求得觸控單元 T(3，l)的感測訊號，例如為 _ [ST(U) + ， 而觸控單元Τ(η，1)的感測訊號為sT(n,l) _ [ST(n-2 +The control unit T(3, l)~T(n, l) outputs the corresponding original signals ST(3, 1) to ST(n, l). After receiving the original signals ST(1,1)~ST(n,l) of the sensing module 1〇2, the U control unit 104 obtains a reference signal based on the original signals. For example, an original signal is selected as the reference signal from the original signals ST(1,1) to ST(n,l). Here, the second original signal ST(2,1) can be selected as a reference. Signal. After selecting the reference signal, the control unit ι〇4 further subtracts the reference signal (ie, the second original signal ST(2, 1)) from the first original signal ST(1, 1) to remove the first original signal. The sensing signal of the touch unit T(l, l) is obtained by the low frequency noise contained in the ST (1, 1). Similarly, the sensing signals of other touch units T(2, 1)~Τ(η, 1) can also be obtained in the same manner, and will not be described again. In this embodiment, the control unit 104 can subtract the two original signals adjacent in time from each other for noise cancellation. For example, during the line scan, the LSI and the LS2 are adjacent in time, so the original signal ST(2, 1) of the LS2 during the line scan period can be used as the reference signal of the original signal ST(1, 1) of the LSI during the 201248471 line scan. The control unit 104 can subtract the reference signal (ie, ST(1,1)-ST(2,1))' from the first original signal ST(1 1) of the LSI during the line scan to obtain the touch unit τ(ι 1 Sensing signal. Similarly, the sensing signal of the touch unit Tq, for example, is ST(2,1)-ST(3,1), and the sensing signal of the touch unit T(n·.) is ST(n- 2, l) - ST (nl, l). In other embodiments, the first original signal ST(1,1) can be used as the first original signal ST(2,1). Control unit 丨. " to obtain the second original signal δτ (2, υ minus: two: ST (2, 1) - ST (1, 1)) ' to obtain the sensing signal of the touch unit τ (2, 1}. For example, the sensing signal of the touch unit T (n_u) is STKUVSTXn-U)' and the sensing signal of the touch unit is ST(n, l)-ST(nl, l). Alternatively, the control unit 104 is used to utilize the two side-control units adjacent to each other in the space to start subtracting each other. For example, the touch unit T(U) and the T(9) are spatially adjacent to each other, so that the original signal swt of the touch unit (10) can be used as a reference signal of the touch unit τ(ι丨). The control section KM can subtract the reference signal (i.e., flush) from the first original signal ST(U) of the touch unit T(u) to obtain the sensing signal of the touch control unit T(u). With this _, for example, the sensing signal of the touch is Boot Mingqing, __ _ signal is STMD-swu). In other embodiments, the touch unit τ (1, the original signal STXU of the υ can be used as the reference of the touch unit = control: the unit subtracts the reference signal (ie, SMDKU) from the original signal of the touch unit) Called the sensing signal of 201248471. By analogy, for example, the sensing signal of the touch unit is only ST' (D-sixm), and the sensing signal of the touch unit (10) is ST(n, l)-ST(nl, l) 〇 In addition, the sensing unit of the touch line S1 on the sensing line S1 can also be analogized to the touch units T(x, 2) to T(x, m) on the other sensing lines S2 to sm, for example. The sensing module 1〇2 can detect the touch units τ(χ, 2)~T(x, m) on the sensing lines S2 to Sm and output a plurality of original signals ST(x, 2) to ST ( x, m), and then find the corresponding reference signal and sensing signal, the details of which are not repeated here. The corresponding sensing signal is obtained by removing the low frequency noise of the original signal of each touch unit, and then sensing The remaining high frequency noise in the signal can be filtered by a low pass filter and a digital signal processor (DSp) filter (not shown). Thus, the control unit 104 can According to the sensing signal after removing the frequency noise and the low frequency noise, the correct touch position is obtained. It is worth noting that the waveforms of the driving signals D1 to Dn are not limited to the driving waveform of FIG. 2, that is, the scanning. The line pl~pn is not limited to be enabled in the order of PI ' P2 '...' ρη_2, ρη_ι, pn. For example, it is also possible to drive/enable odd-numbered scan lines (for example, P1, p3, ... ), then drive/enable even scan lines (for example, P2, ...). In this example, the original signal ST (1, 1) of the touch unit D1 (1, 1) and the touch unit T (3, l) The original signal ST(3,1) is adjacent in time, so the original signal sTpj) can be used as the reference signal of the original signal ST(1,1). The control unit 104 can touch the touch unit T(1, U's original signal minus the reference signal (ie ST(1,1) - ST(3,1)), § 11 201248471 to obtain the sensing signal of the touch unit τ(1,1). The sensing signals of the remaining touch units are obtained. In other embodiments, the first original signal ST(1, 1) can be used as the reference signal of the third original signal ST(3, 1). The control unit 104 can use the third original The signal ST (3, 1) subtracts the reference signal (that is, ST (3, 1) - ST (1, 1)) ' to obtain the sensing signal of the touch unit T (2, l). Signals can be based on two or more line scan periods For example, the control unit 1 〇4 can connect the original signals ST(2, 1) to ST corresponding to the touch units T(2, l) to T(3, l) ( The average value or the weighted average of 3, 1) is used as the reference signal of the touch unit T(l, l), and the sensing signal of the touch unit T(l, l) is obtained, for example, _ [§τ( 2 1) + ST(3,l)]/2, and the sensing tfL of the touch unit T(n-2,1) is 8 □(11_2,1)-[ST(n-l'l) + ST(n,l)]/2. Alternatively, the control unit 1〇4 uses the average or weighted average of the original signals ST(1,1) to ST(2,1) of the touch units T(l,l)~T(2,l) as The reference signal of the touch unit T (3, l) is obtained, and the sensing signal of the touch unit T (3, 1) is obtained, for example, _ [ST(U) + , and the touch unit Τ (η, 1) The sensing signal is sT(n,l) _ [ST(n-2 +
ST(n-l，l)]/2。 ，J 在，他實施例中，控制單元1〇4將同一條感測線^ 有觸控單70的原始訊號進行平均運算或加權平均訊算， 求得參考訊號。例如，控制單元1〇4將觸^" T(2，l)〜TdU)的原始訊號卿山〜柳山的 : 平均值做為觸控單元T(1，⑽參考訊號。又或者，^力 兀顺將原始訊號ST(U)〜ST(n l)的平均值或加^ 做為感測線S1的所有觸控單元T(u)〜T(n山的參考％ST(n-l,l)]/2. In the embodiment, the control unit 1〇4 averages or weights the original signal of the touch line 70 of the same sensing line to obtain a reference signal. For example, the control unit 1〇4 will touch the original signal of T&T; T(2, l)~TdU): The average value is used as the touch unit T (1, (10) reference signal. Or, ^ force兀Shun the average value of the original signal ST(U)~ST(nl) or add ^ as all the touch units T(u)~T of the sensing line S1 (reference % of n mountain
12 201248471 + #圖3、θ示為本發明另一實施例之觸控 本實施例可以參昭前㈣，rt 順展置的不思圖。 3，在本實施狀觸^圖置1::的相關說明。請參照圖 分別利用感測電;控i置：^ ㈣的-端_+應二貫二其 測線。例如感測電容㈤ni ^ 接對應的感 另-端則耦接至•，遞S1:—5耦接至一掃描線P1 ’ 至-掃扩二/ 感測電容吨1)的-端耦接 田線P2.’另—端則叙接至感測、線S1，依此類推。 ^卜’感測模、組102包括多個第一電容α以及多個 。運算放大器ai〜Am的反相輸入端分 =感測線S1〜sm與對應的第一電容C1的第一端，各 運异放大θ A1〜Am的非反相輸人端祕至—參考電壓 =ref’ ^外運算放大器A1〜Am的輪出端則麵接至對應的 第一電容ci的第二端以及控制單元1〇4。 假設本實施例之驅動訊號D1〜Dn即為圖2所示之驅 動訊號=〜Dn，其中驅動訊號m〜Dn在低準位時為掃描 線的線知描期間，且驅動訊號Di〜Dn的高低電壓準位差為 △V。如圖3所示，假設使用者的手指在觸控面板1〇6上 的觸碰位置為知描線Pn-2與感測線Sm的交又處，即觸控 單兀T(n-2，m)。使用者的手指在觸控單元T(n_2m)的感測 電容Cs(n-2，m)上所造成的電容差值為△(：：。 運算放大器A1〜Am分別於不同的線掃瞄期間偵測對 應的掃描線上的觸控單元以輸出多個原始訊號。在此假設 所有感測電容的電容值是Cs。舉例來說，當掃描線pn_2 13 201248471 被致能時，運算放大器A1〜Am輸出觸控單元Τ(η-2，1)〜 T(n-2，m)的原始訊號ST(n-2，l)〜ST(n-2，m)至控制單元 104 ’其電壓值分別為ν(η·2,1)〜V(n-2,m)。其中，原始訊 號ST(n-2，m-l)的電壓值V(n-2，m-l)可以下列式子表示： V(n - 2, m -1) = AV + VN(n - 2, m -1) 其中VN(n-2,m-l)為運算放大器Am-1偵測觸控單元 T(n-2，m-l)所輸出之原始訊號ST(n-2,m-l)中的雜訊電壓。 類似地，原始訊號ST(n-2,m)的電壓值V(n-2，m)可以下列式 子表示： V(n-2,m) = ~--C Δ V + VN(n - 2, m) + VFN Cl 其中VN(n-2,m)為運算放大器Am偵測觸控單元 T(n-2，m)所輸出之原始訊號sT(n-2，m)中的雜訊電壓，而 VFN則為手指觸碰觸控面板1〇6時所造成雜訊電壓。 另外’當掃描線Pn-1被致能時，運算放大器A1〜Am 輸出觸控單元T(n-l，l)〜T(n-l,m)的原始訊號ST(n-l，l)〜 ST(n-1，m) ’而原始訊號ST(n-l,l)〜ST(n-l，m)的電壓值則 分別為V(n-l，l)〜v(n-l，m)。其中，原始訊號ST(n-l,m-l) 的電廢值V(n-l，m-i)可以下列式子表示： V(n_1，m-l)=^^V + VN(n-l，m-l) 其中VN(n-l，m-l)為運算放大器Am-1偵測觸控單元 T(n_1，m_1)所輸出之原始訊號ST(n-l，m-l)中的雜訊電壓。 類似地，掃描線Pn-1被致能時原始訊號ST(n_l，m)的電壓 值V(n-l，m)可以下列式子表示： V(n -1 ,ηι) ^ ££Δν + . + γρΝ12 201248471 + # Figure 3, θ shows the touch of another embodiment of the present invention. This embodiment can refer to the front (4), and the rt is unsuccessful. 3. In the present embodiment, the touch map is set to 1:: Please refer to the figure to use the sensing power separately; control i: ^ (four) - end _ + should be two consecutive lines. For example, the sense capacitor (5) ni ^ is connected to the corresponding sense - the other end is coupled to the •, the S1: -5 is coupled to a scan line P1 ' to - sweep 2 / sense capacitance tons 1) - end coupled to the field Line P2. 'The other end is connected to the sense, line S1, and so on. The sensing mode, group 102 includes a plurality of first capacitances α and a plurality. The inverting input terminal of the operational amplifiers ai~Am is the sensing line S1~sm and the first end of the corresponding first capacitor C1, and the non-inverting input terminal of each of the different amplifications θ A1 to Am is - the reference voltage = The round ends of the external operational amplifiers A1 to Am are connected to the second end of the corresponding first capacitor ci and the control unit 1〇4. It is assumed that the driving signals D1 to Dn in this embodiment are the driving signals=~Dn shown in FIG. 2, wherein the driving signals m~Dn are in the low level when the lines of the scanning lines are known, and the driving signals Di~Dn are driven. The high and low voltage level difference is ΔV. As shown in FIG. 3, it is assumed that the touch position of the user's finger on the touch panel 1〇6 is the intersection of the line Pn-2 and the sensing line Sm, that is, the touch unit T(n-2, m). ). The difference in capacitance caused by the user's finger on the sensing capacitance Cs(n-2,m) of the touch unit T(n_2m) is Δ(::. The operational amplifiers A1 to Am are respectively in different line scan periods. Detecting the touch unit on the corresponding scan line to output a plurality of original signals. It is assumed here that the capacitance value of all the sense capacitors is Cs. For example, when the scan line pn_2 13 201248471 is enabled, the operational amplifiers A1~Am Outputting the original signals ST(n-2, l) to ST(n-2, m) of the touch unit Τ(η-2,1)~T(n-2,m) to the control unit 104' It is ν(η·2,1)~V(n-2,m), wherein the voltage value V(n-2,ml) of the original signal ST(n-2,ml) can be expressed by the following formula: V( n - 2, m -1) = AV + VN(n - 2, m -1) where VN(n-2,ml) is the op amp Am-1 detecting the touch unit T(n-2,ml) The noise voltage in the original signal ST (n-2, ml) is output. Similarly, the voltage value V(n-2, m) of the original signal ST(n-2, m) can be expressed by the following equation: V ( N-2,m) = ~--C Δ V + VN(n - 2, m) + VFN Cl where VN(n-2,m) is the operational amplifier Am detecting the touch unit T(n-2,m ) the original signal sT output (n-2) The noise voltage in m) is the noise voltage caused by the finger touching the touch panel 1〇6. In addition, when the scan line Pn-1 is enabled, the operational amplifiers A1 to Am output the touch. The original signal ST(nl,l)~ST(n-1,m)' of the unit T(nl,l)~T(nl,m) and the original signal ST(nl,l)~ST(nl,m) The voltage values are respectively V(nl, l)~v(nl,m), wherein the electric waste value V(nl,mi) of the original signal ST(nl,ml) can be expressed by the following formula: V(n_1,ml) =^^V + VN(nl,ml) where VN(nl,ml) is the operational amplifier Am-1 detecting the miscellaneous signal ST(nl,ml) output by the touch unit T(n_1,m_1) Similarly, when the scan line Pn-1 is enabled, the voltage value V(nl,m) of the original signal ST(n_l,m) can be expressed by the following equation: V(n -1 , ηι) ^ ££Δν + . + γρΝ
14 201248471 其中VN(n-l，m)為運算放大器Am偵測觸控單元 T(n-l，m)所輸出之原始訊號灯⑼丨邱）中的雜訊電^，而 VFN則為手指觸碰觸控面板106時所造成的雜訊電壓。 在本實施例中，可設定位於同一個感測線Sm的原始 訊號ST(n-l，m)做為原始訊號ST(n_2，m)的參考訊號。控制 單元104可藉由將原始訊號ST(n-2，m)與對應的參考訊號 ST(n-l，m)相減以去除原始訊號sT(n-2,m)中的低頻雜訊。 以此類推，控制單元1〇4可藉由將原始訊號sT(n_2，i)〜 ST(n_2，m-1)分別與對應的參考訊號ST(n-1，1)〜ST(n-1，m-1) 相減，以去除原始訊號ST(n_2,l)〜ST(n-2，m-l)中的低頻雜 訊。舉例來說’在本實施例中去除低頻雜訊後的感測訊號 ST’(n-2，m-1)的電壓值△ vw'm-1)可如下列式子所示： AV(n-2,m-l)=V(n-2,m-l)-V(n-l,m-l)14 201248471 where VN(nl,m) is the op amp Am detecting the noise signal in the original signal light (9) of the touch unit T(nl,m), and the VFN is the finger touch touch The noise voltage caused by the panel 106. In this embodiment, the original signal ST(n-1, m) located on the same sensing line Sm can be set as the reference signal of the original signal ST(n_2, m). The control unit 104 can remove the low frequency noise in the original signal sT(n-2, m) by subtracting the original signal ST(n-2, m) from the corresponding reference signal ST(n-1, m). By analogy, the control unit 1〇4 can respectively use the original signals sT(n_2,i)~ST(n_2,m-1) and the corresponding reference signals ST(n-1,1)~ST(n-1). , m-1) Subtract, to remove low frequency noise in the original signal ST (n_2, l) ~ ST (n-2, ml). For example, the voltage value Δ vw'm-1 of the sensing signal ST'(n-2, m-1) after the low frequency noise is removed in this embodiment can be expressed as follows: AV(n -2,ml)=V(n-2,ml)-V(nl,ml)
Cs Cs = ~Δν + VN(n-2?m-l)-—AV-VN(n-l,m-l) =VHN(n-2，m-l) 其中VHN(n-2,m-l)為去除低頻雜訊後的感測訊號 ST’(n-2，m-l)中的高頻雜訊電壓。另外，去除低頻雜訊後的 感測訊號ST，(n-2,m)的電壓值△ V(n_2,m)則可如下列式子 所示： AV(n - 2,in) = V(n - 2,m) - V(n - l,m)Cs Cs = ~Δν + VN(n-2?ml)--AV-VN(nl,ml) =VHN(n-2,ml) where VHN(n-2,ml) is the feeling of removing low frequency noise High frequency noise voltage in the test signal ST' (n-2, ml). In addition, after the low-frequency noise is removed, the voltage value ΔV(n_2,m) of (n-2,m) can be expressed as follows: AV(n - 2,in) = V( n - 2,m) - V(n - l,m)
=△ V + νΝ(η _ 2, m) + VFN -岩△ V - VN(n -1，m) - VFN =AV + VHN(n - 2, in) 其中Cl為手指觸碰觸控面板106時所造成的感測電壓 15 201248471 差’而VHN(n-2，m)則為去除低頻雜訊後的原始訊號 ST(n-2，m)中的高頻雜訊電壓。原始訊號ST(n-2，m)中手指 所造成的雜訊電壓VFN (低頻雜訊)可以被去除。 類似地，其他觸控單元的感測訊號亦可以類似的方式 求得，因此不再贅述。 經由控制單元104將各個原始訊號與對應的參考訊號 相減後’所獲得的感測訊號中僅剩下高頻雜訊電壓以及手 指觸碰觸控面板106時所造成的感測電壓差。其中高頻雜 訊電壓可藉由習知技術的低通濾波器或DSP濾波器（未繪 示）輕易地濾除’而使感測訊號僅留下手指觸碰觸控面板 106時所造成的感測電壓差，如此便可避免感測結果受到 雜訊電壓的影響而造成觸控位置的誤判。 值得注意的是，上述之觸控單元T1並不限定為感測 電谷Cs ’也就是說’觸控面板1〇6並不限定為電容式觸控 面板’其亦可為其它類型的觸控面板，例如電阻式觸控面 板。 圖4繪示為本發明一實施例之觸控裝置的觸控感測方 法的流程圖。請參照圖4，歸納上述觸控裝置1〇〇的觸控 感測方去可包括下列步驟：首先，於一第一線線掃描期間 (例如驅動訊號D1的線掃描期間）驅動第一觸控單元(例如 觸控單元T(l，l))(步驟S402)。接著，於第一線掃描期間透 過感測線(例如感測線S1)偵測第一觸控單元以獲得一第一 原始訊號(例如原始訊號ST(1，1))(步驟S404) ’其中觸控單 元可例如為感測電容。之後，於一第二線掃描期間（例如驅 201248471 動訊號D2的線掃描期間）驅動第二觸控單雄 元Τ(2，υΧ步驟S406)，*中參考訊號可例如為某 = 期間内感賴組102所輸出的原始喊，或者是相鄰上一 個或下一個線掃描期間感測模組1〇2所輸出的原始訊號， 又或者是不同線掃描期間所產生的原始訊號的平；值或 °加 權平均值。接著’於第二線掃描期間透過感測線彳貞測第二 觸控單元以獲得一第二原始訊號（例如原始訊號 ST(2，1))(步驟S408)。之後，依據第二原始訊號求出一參考 訊號(步驟S410)。最後，將第—原始訊號減去參考訊號， 以獲得第一觸控單元的感測訊號(步驟S412)。 綜上所述，本實施例將不同線掃描期間所得到的原始 訊號求出參考訊號，並將各個原始訊號分別減去對應的參 考訊號，以去除原始訊號中所包含的低頻雜訊而得到對應 的感測訊號，使感測訊號中僅剩下高頻雜訊電壓以及手指 觸碰觸控面板時所造成的感測電壓差。其中高頻雜訊電壓 可藉由習知技術的低通濾波器或DSP濾波器輕易地濾 除，而使感測訊號中僅剩下手指觸碰觸控面板時所造成的 感測電壓差，如此便可避免感測結果受到雜訊電壓的影響 而提高判斷觸控位置的正確性。 雖然本發明已以實施例揭露如上，然其並非用以限定 本發明’任何所屬技術領域中具有通常知識者，在不脫離 本發明之精神和範圍内，當可作些許之更動與潤飾，故本 發明之保護範圍當視後附之申請專利範圍所界定者為準。=Δ V + νΝ(η _ 2, m) + VFN -rock Δ V - VN(n -1,m) - VFN =AV + VHN(n - 2, in) where Cl is the finger touching the touch panel 106 The sense voltage 15 201248471 is poor and VHN(n-2,m) is the high frequency noise voltage in the original signal ST(n-2,m) after removing low frequency noise. The noise voltage VFN (low frequency noise) caused by the finger in the original signal ST(n-2, m) can be removed. Similarly, the sensing signals of other touch units can be obtained in a similar manner, and therefore will not be described again. Only the high frequency noise voltage and the sensing voltage difference caused when the finger touches the touch panel 106 are left in the sensing signal obtained by the control unit 104 after subtracting each original signal from the corresponding reference signal. The high-frequency noise voltage can be easily filtered by a low-pass filter or a DSP filter (not shown) of the prior art, so that the sensing signal is only caused by the finger touching the touch panel 106. Sensing the voltage difference, this can avoid the misjudgment of the touch position caused by the influence of the noise voltage. It should be noted that the above-mentioned touch unit T1 is not limited to sensing the electric valley Cs 'that is, the touch panel 1〇6 is not limited to a capacitive touch panel', which may also be other types of touch. A panel, such as a resistive touch panel. 4 is a flow chart of a touch sensing method of a touch device according to an embodiment of the invention. Referring to FIG. 4, the touch sensing device of the touch device 1A can be summarized as follows. First, the first touch is driven during a first line scan period (for example, during a line scan of the driving signal D1). A unit (for example, a touch unit T(l, l)) (step S402). Then, the first touch unit is detected by the sensing line (for example, the sensing line S1) to obtain a first original signal (for example, the original signal ST(1, 1)) during the first line scanning (step S404). The unit can be, for example, a sensing capacitor. Then, during a second line scan period (for example, during the line scan of the drive 201248471 motion signal D2), the second touch unit is driven (2, step S406), and the reference signal in * can be, for example, a certain sense of time. The original shouting output by the Lai group 102 is either the original signal output by the sensing module 1〇2 during the previous previous or next line scan, or the level of the original signal generated during the different line scans; Or ° weighted average. Then, the second touch unit is detected through the sensing line during the second line scanning to obtain a second original signal (for example, the original signal ST(2, 1)) (step S408). Then, a reference signal is obtained according to the second original signal (step S410). Finally, the reference signal is subtracted from the first original signal to obtain a sensing signal of the first touch unit (step S412). In summary, in this embodiment, the original signal obtained during different line scans is used to obtain a reference signal, and each original signal is respectively subtracted from the corresponding reference signal to remove the low frequency noise included in the original signal to obtain a corresponding signal. The sensing signal is such that only the high frequency noise voltage is left in the sensing signal and the sensing voltage difference caused by the finger touching the touch panel. The high-frequency noise voltage can be easily filtered by a low-pass filter or a DSP filter of the prior art, so that only the sensing voltage difference caused by the finger touching the touch panel remains in the sensing signal. In this way, the sensing result is prevented from being affected by the noise voltage, and the correctness of determining the touch position is improved. The present invention has been disclosed in the above embodiments, and it is not intended to limit the invention to those skilled in the art, and it is possible to make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.
S 17 201248471 【圖式簡單說明】 圖1繪示為本發明一實施例之觸控裝置的示意圖。 圖2 %不為本發明一實施例之各掃描線的驅動訊號的 波形示意圖。 圖3綠示為本發明另一實施例之觸控裝置的示意圖。 圖4綠示為本發明一實施例之觸控裝置的觸控感測方 法的流程圖。 【主要元件符號說明】 100、300:觸控裝置 1〇2 :感測模組 104 :控制單元 106 :觸控面板 P1〜Pn :掃描線 S1〜Sm :感測線 T(l，l)〜T(n，m):觸控單元 ST(1，1)〜ST(n，m):原始訊號S 17 201248471 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a touch device according to an embodiment of the invention. Figure 2 is a waveform diagram showing the driving signals of the respective scanning lines in an embodiment of the present invention. 3 is a schematic diagram of a touch device according to another embodiment of the present invention. 4 is a flow chart of a touch sensing method of a touch device according to an embodiment of the invention. [Main component symbol description] 100, 300: touch device 1〇2: sensing module 104: control unit 106: touch panel P1~Pn: scan lines S1~Sm: sensing line T(l, l)~T (n, m): touch unit ST (1, 1) ~ ST (n, m): original signal
Cs、C1 :電容 A1〜Am :運算放大器Cs, C1: Capacitor A1~Am: Operational Amplifier
Vref :參考電壓 D1〜Dn :驅動訊號 AV :驅動訊號的高低電壓準位差 S402〜S412 :觸控裝置的觸控感測方法步驟 18Vref: reference voltage D1~Dn: drive signal AV: high and low voltage level difference of drive signal S402~S412: touch sensing method step of touch device 18