200917130 九、發明說明： 【發明所屬之技術領域】 本發明係為一種利用電流源控制及補償觸控電容感測方法及 其裝置，特別是關於一種應用於觸控螢幕(T〇uch Screen)、滑動開 關(Sllder)、矩陣開關(Matrix)、滑輪開關(wheel)或筆觸螢幕 (Pen-Pad)等觸控襄置，可利用電流源來控制及補償觸控電容感測 器的方法及其裝置。 【先前技術】 —按’由於科技的進步，觸控技術的應用已經普遍發展在許多 豕電叹備上，例如在烤箱和煎鍋的不透明玻璃面板後面，即是採 用分離式敏按鍵來實現。這細控按鍵逐㈣代了機械按鍵， 因為機械按鍵的使料命短，而域必需在面板上開孔安裝按鍵 的相關成本。 此外’觸控螢幕已成為目前最重要的應用技術，而觸控螢幕 的觸控技術有電阻式输及電容式觸控等，電阻式雜榮幕在被 刮擦和產生裂紋後會很快老化，所以電容式觸控技術具有耐用、 成本低等特點，而逐漸成為觸控的首選技術。 $界常常會有-個錯誤峨念，認為電容式難技術，其人 ^定要接地，手指才能啟_控，其料指能賊應觸控是因 為^表面帶有電荷，因此例如在車上要接聽電話_測，只需要 手指在10cm内輕輕一揮，並不一定要碰到，即可偵測到板小的 容值啟動觸控。 卜目前的觸控螢幕大都是多重觸控點(Multi_Pad)俄測，即同時可 偵測複數_控點被觸控，而需要躺簡控點電容值常常是很 ，近的，且必需設計㈣應的複數組電容感·及細電容，才 能即時計算及反應’但如此電容電路的設計成本也相應提 200917130 如圓 ’糸為I知4組觸控點的電容式觸控感測器電路架構示 感瀬1 f設計柄體電路.，簡控❹⑻連接 一·=控輸入點(D1-D4)2及4組的感測電容器(Csl-Cs4)3，而每 i點2亦都連接有—觸控電容器_綱5，當手指觸碰 I； ft點2時，該觸控電容器5都會感應出—觸控電容值， m工電|器5所感應的電容值轉移至所對應的感測電容器3上 斷崎驗電容115妨級電，續娜觸控點電 至感測電容器3，再侧感測電容器3的電容值來判 ==人點是否被觸控，因此觸控輸人點越多，則偵測的速度 就會越慢。 、另外外1^環境的脈度、濕度及幹擾源也會影塑到電 容感測器對觸控點電容值的偵測。因此針對習知的電容式^ 測器而言，對於偵測的觸控點電容值太小時，_時的雜散^容 值太大時，以及鄰近多重觸控點電容值太相近時，都不容易被偵 測出來，而造成無法觸控或誤觸控的問題。 ' 職是，本案發明人即為解決上述現有電容式觸控感測技術的 缺失與不便，乃特和研究並配合學理之勒，提巾—種控制電 流源的增加或減少，以便對觸控感測器之外部觸控點電容^先行 充電或感測電容器放電，以類似提高或降低觸控電容值^測g [’並可加速f询控點電容值的彳貞測，因此可有效改善因環境幹 擾或多重觸點太相近的情形或電容值太小時情況。 ' 【發明内容】 本發明之目的係提供一種電流源控制及補償觸控電容感測方 法及其裝置，用以解決當要求偵測觸控電容很小時，或者&雜散 電容很大的環境下，或者相鄰觸控輸入點的觸控電容值很相近^ 200917130 ，皆可偵測分辨出來是否有被手指觸控產生。 ⑼ίΐ成上述目的’本發明之主要技術概係在於提供一種電 流制工制及補侧控電容感财法，係由―電容感測器連接一或 觸控輸人點及—感測電容器所組成，每—觸控輸入點又 =:觸控電容器’該方法先清除該感測電容器之電荷及該觸控 產生—可變電流源對該觸控電容器充電，充電Μ 觸控電容ϋ上之電荷，f積至該感測電舞上，產生一累 達到-參考電壓(Vref)為止’且該計數值 ^ 觸控輸入點有觸控產生。 付4树，即表㈣ 為達成上述目的’本發明之次—技術特徵係在於提供 賞觸控電容感測裝置’係包括一電容感測器連接一 或個以上觸控輸入點及一感測電容器，每 接一觸控電容器，該電容感測器内包括_二=1 制相關元件之動作;一多功單爾接該』匕可=控 元之控制選擇任-該觸控輸人點及其連接 _制及補償單㈣、連接該控制單元及該多Hi : 元之控制產生-可變電·，可對該多功單 単 器充電；—電容_單元係連_控制單ί賴工電容 流源控制及補償單元及該感測電容器，受今=70 5亥電 移轉該多功單元所選擇之觸控電容器上;電==， 位量測計解元係連接該控鮮元及該❹彳 元之控制’用以計數該電容偵測單元移轉1電 累積測=;上，數，關岐讨=的電何 2:,1!=;!變_對該感測電容器 為達成上述目的，本發明之另一枯淋4 Λ屋玍。 _控制及補償·電容_方法及其裝置述電 200917130 及補償單元所產生之可變電流源係可依要灰， 的偵測環境下，增加可變電流輯該㈣_ j控電容值很小 觸控電容仍可以被侧到。 電匈充電量’俾使該 為達成上述目的，本發明之又一技術牲料 流源控制及補償觸控電容制方法及錄置* I於提供上述電 及補償單元所產生之可變電流源係可依要求，在 電路環境下，產生負的可變電流源對該感測二 令 '"的 走該雜散電容所帶的電荷，使該感測電^器電，俾便流 移轉的電荷。 剩下觸控電容器所 為達成上述目的，本侧之再-技術魏係在 _控制及補償觸控電容感測方法及其褒置， 2 3 =數單元之計數，，可依要求增加為_數，以提‘鄰; 控輸入點之觸控電容值相近時的解析度，增加分辨的能力。 【實施方式】 為了使貴審查委員能更進-步瞭解本發明為達成預定 所採取之麟、手段及功效，請參_下有關本發明之詳細說明 與附圖，相信本發明之目的、特徵與特點，#可由此得—深入且 具體之瞭解，然而所附圖式僅提供參考與說明用，並非用來 發明加以限制者。 、請參酬二所示’係為本發明以4組觸控輸人點為實施例之觸 控感測器電路架構示意圖。本發明之觸控_電路1G主要包括有 至少-觸控制HU、U以上觸控輸人點12及—感測電容 器13 ’以圖二之實施例說明，該觸控感測係連接有4組觸控輸 入點(D1_D4)12及-感測電容器(Cs)13，該觸控輸人點12係可分佈 於-觸控榮幕上或複數觸控板上’每—該觸控輸人點12亦皆對應 連接有一觸控電容器(Cxl-Cx4)14。 & 200917130 (Dl-D4)12有被翻及沒有被接觸時所 的將此電荷人’而準確 由於觸控輸入點的周遭會有寄生電容存在，且有時該此寄生電：200917130 IX. Description of the Invention: [Technical Field] The present invention relates to a method and device for sensing and compensating a touch capacitance using a current source, and more particularly to a touch screen (T〇uch Screen), Touch device such as slide switch (Sllder), matrix switch (Matrix), pulley switch (wheel) or pen touch screen (Pen-Pad), method and device capable of controlling and compensating touch capacitance sensor by using current source . [Prior Art] - Press 'Because of advances in technology, the application of touch technology has been widely developed on many electrical sighs, such as behind opaque glass panels in ovens and frying pans, using separate sensitive buttons. This fine control button replaces the mechanical button by (4), because the mechanical button has a short life, and the domain must have the associated cost of installing the button on the panel. In addition, the touch screen has become the most important application technology at present, and the touch technology of the touch screen has resistive and capacitive touch, etc. The resistive miscellaneous screen will quickly age after being scratched and cracked. Therefore, capacitive touch technology has the characteristics of durability and low cost, and has gradually become the preferred technology for touch. $Bound often has a false mourning, think that capacitive is difficult to technology, its people must be grounded, the finger can be activated, the material refers to the thief should touch because the surface has a charge, so for example in the car To answer the phone _ test, only need a finger within 10cm, do not have to touch, you can detect the small value of the board to start the touch. Bu's current touch screens are mostly multi-touch (Multi_Pad) Russian test, which means that the complex number can be detected at the same time. The control point is touched, and the value of the touch point is often very close, and must be designed (4) The complex array capacitance and the fine capacitance can be calculated and reacted in real time. 'But the design cost of the capacitor circuit is also corresponding to 200917130. For example, the circular touch sensor circuit structure of the four groups of touch points is known. The sensing 瀬1 f design handle body circuit. The simple control ❹ (8) is connected to a == control input point (D1-D4) 2 and 4 sets of sensing capacitors (Csl-Cs4) 3, and each i point 2 is also connected - Touch capacitor _ class 5, when the finger touches I; ft point 2, the touch capacitor 5 will sense the value of the touch capacitance, the capacitance value sensed by the m power device 5 is transferred to the corresponding sense Measure the capacitor 3 on the faulty capacitor 115 to prevent the level of electricity, continue to touch the point to the sensing capacitor 3, and then sense the capacitance of the capacitor 3 to determine = = whether the person is touched, so touch input The more points, the slower the detection will be. In addition, the pulse, humidity and interference sources of the external environment will also be reflected in the capacitance sensor's detection of the touch point capacitance value. Therefore, for a conventional capacitive sensor, when the detected touch point capacitance value is too small, when the spurt capacitance value is too large, and when the adjacent multiple touch point capacitance values are too close, It is not easy to be detected, resulting in problems that cannot be touched or touched. 'The job is that the inventor of the present case is to solve the above-mentioned lack of inconvenience and inconvenience of the existing capacitive touch sensing technology, and to study and cooperate with the theory, the towel to control the increase or decrease of the current source, so as to touch The external touch point capacitance of the sensor ^ first charge or sense the capacitor discharge, similar to increase or decrease the touch capacitance value ^ g [' and can accelerate the speculation of the f-control point capacitance value, so it can effectively improve Due to environmental interference or multiple contacts are too close or the capacitance value is too small. SUMMARY OF THE INVENTION The object of the present invention is to provide a current source control and compensation touch capacitance sensing method and device thereof, which are used to solve an environment where it is required to detect a small touch capacitance or an & a large stray capacitance environment. Underneath, or the touch capacitance values of adjacent touch input points are very similar ^ 200917130, can detect whether it is detected by finger touch. (9) The above-mentioned main purpose of the present invention is to provide a current manufacturing system and a complementary side control capacitance sensing method, which are composed of a capacitive sensor connected to a touch input point and a sensing capacitor. Each touch input point == touch capacitor 'this method first removes the charge of the sense capacitor and the touch generates - the variable current source charges the touch capacitor, and charges the charge on the touch capacitor , f is accumulated on the sensing electric dance, and a tired reaching - reference voltage (Vref) is generated and the counting value is generated by the touch input point. Pay 4 trees, that is, Table (4) In order to achieve the above objective, 'the second aspect of the present invention is to provide a touch-sensitive capacitive sensing device' comprising a capacitive sensor connected to one or more touch input points and a sensing Capacitor, each connected to a touch capacitor, the capacitive sensor includes the action of the _2=1 related component; a multi-function single is connected to the 匕 匕 = control of the control element is selected - the touch input point And its connection_compensation and compensation list (4), connecting the control unit and the multi-Hi: element control generation-variable electricity, can charge the multi-function single-turn device; -capacitance_unit connection_control list The capacitor current source control and compensation unit and the sensing capacitor are transferred to the touch capacitor selected by the multi-function unit by the current =70 5 hai electric power; the electric==, the bit quantity measuring system is connected to the control unit The control of the element and the element is used to count the capacitance detection unit to shift 1 electric cumulative measurement =; upper, number, off begging = electricity 2:, 1! =; change _ the sense Capacitor In order to achieve the above object, the present invention is another dry shovel. _Control and compensation·Capacitor_Method and its device The variable current source generated by the 200917130 and the compensation unit can increase the variable current according to the detection environment of the gray, (4) _ j control capacitor value is very small The control capacitor can still be sideways. In order to achieve the above object, another method for controlling and compensating the touch capacitance of the present invention is to provide a variable current source generated by the above-mentioned electric and compensation unit. According to the requirement, in the circuit environment, a negative variable current source is generated for the sensing of the electric charge of the stray capacitance, so that the sensing electric device is electrically discharged. Turned charge. The remaining touch capacitors are used to achieve the above objectives. The re-technology of this side is based on the method of sensing and compensating the touch capacitance sensing and its setting, and the counting of 2 3 = number of cells can be increased to _ number according to requirements. To improve the resolution of the touch capacitance values of the input points, and increase the resolution. [Embodiment] In order to enable the reviewing committee to further understand the principles, functions, and effects of the present invention in order to achieve the reservation, please refer to the detailed description and drawings of the present invention, and believe the purpose and features of the present invention. And the features, which may be derived from the in-depth and specific understanding, are not intended to be limited by the invention. Please refer to the description of the circuit structure of the touch sensor of the present invention with four groups of touch input points as an embodiment. The touch-control circuit 1G of the present invention mainly includes at least a touch control HU, a U touch touch input point 12 and a sense capacitor 13 ′. The embodiment of FIG. 2 illustrates that the touch sensing system is connected with four groups. Touch input point (D1_D4) 12 and - sense capacitor (Cs) 13, the touch input point 12 can be distributed on the touch screen or on the plurality of touch panels 'each-the touch input point 12 is also connected to a touch capacitor (Cxl-Cx4) 14. &200917130 (Dl-D4)12 has the charge of being turned over and not touched. Accurately there are parasitic capacitances around the touch input point, and sometimes this parasitic electricity:
It要容11 __是麵控輸入點 而有時觸控感測器11需要偵測很小的觸控電容值，因此需要 很尚的靈敏度，但如料觸控感測器„在—個電荷很重的區1 又需要^測-個靈敏度很高的電荷時，要如何分辯呢?本發明的解 決辦法是增加該觸控感測器u的解析度。 舉例來說，-個觸控電容器14的電荷移轉到感測電容器13， 需要lObit的解析度才能解析债測小電荷，但馳鳩轉換器 (Analog to Digital Converter)的硬體成本非常昂貴 傕二 -次移轉·小電荷的方法’又需要花費較長“ 以如何增加解析度常常需要考慮硬體成本及軟體執行速度的問 題，因此本㈣彻電流源雜做猶來解決關題，利用其 中4bit是可控制的電流，去注入觸控輸入點12，如此並不會多耗損 時間，亦不會影響實際偵測，以本發明的實施例說明如下。 請參閱圖三所示，係為本發明實施例之觸控感測器内部模擬 方塊圖。本發明之觸控感測器丨丨係設計成積體電路，其内部電 路可模擬成一控制單元（Controller)20、一多功單元 (Multiplexer^、一電流源控制及補償單元(Currem soui：Ce f〇rIt is required that 11 __ is the face-control input point and sometimes the touch sensor 11 needs to detect a small touch capacitance value, so it requires a very high sensitivity, but the touch sensor „在一When the area 1 with a very high charge needs to measure a highly sensitive charge, how to distinguish it? The solution of the present invention is to increase the resolution of the touch sensor u. For example, a touch The charge of the capacitor 14 is transferred to the sensing capacitor 13, and a resolution of 10 bits is required to resolve the small charge of the debt measurement, but the hardware cost of the Analog to Digital Converter is very expensive. The second-time transfer and the small charge The method 'has to take a long time'. How to increase the resolution often needs to consider the hardware cost and the speed of software execution. Therefore, this (4) thorough current source is still used to solve the problem, using 4bit which is a controllable current. The injection of the touch input point 12 does not consume much time and does not affect the actual detection. The embodiment of the present invention is described below. Referring to FIG. 3, it is an internal simulation block diagram of a touch sensor according to an embodiment of the present invention. The touch sensor of the present invention is designed as an integrated circuit, and the internal circuit can be simulated into a control unit (Controller) 20, a multi-function unit (Multiplexer^, a current source control and compensation unit (Currem soui: Ce) F〇r
Control and Compensation)22、一 電容偵測單元(Capacitor Detector)23及一電容準位量測計數單元(capacitor Level Measure Counter)24，如圖二所示，本發明之觸控感測器丨丨除連接一或一個 以上的觸控輸入點12外，且僅連接一感測電容器13。 其中該控制單元20係連接該多功單元21、電流源控制及補償 單元22、電容偵測單元23及電容準位量測計數單元24，其可藉由 200917130 軟體控制所有_桃元件_作，該多功單元21又連接該些觸 控輸入點12、電流源控制及補償單元22及電容偵測單元23，該 流源控制及補償單元22又連接至該電容_單元23，㈣電^偵 測單元23及電容準位量晰數單元24分猶接該_電容器 兩端。 該多功單元21係模擬成-多功器，可受該控制單元2〇控制選 擇任-該觸控輸人點及其連接之難電容器，主要有二種動作狀 態，其一疋由该電流源控制及補償單元22產生可變電流源對任一 該觸控輸人點12進行預先充電，其二是由該電容細單元23轉移 賴控電容H14上的電荷帛積至觀戦容器13上，以 有觸控產生。 ' 該電流源㈣及補鮮元22除了產生可f f流轉該些觸控 電容器14之預先充電外，亦可將可魏流源傳送至該電容偵測單 凡23 ’對域測電容15做預先的放f動作。因此該電容制 2河由控制器20控制，-方面移轉及累積該觸控電容器14上的電 何，另-方面可以配合電流源控制及補償翠元22 ，電壓補償增加或減少的效果，再配合該電容準位^ 單元24 ’ #數0亥電谷偵測單元23移轉該賴空電容器14上的電 積至該感測電容即上的缝’以躺是鮮手_控產生。、 請-併參關三及圖四所示，係為本發明實施例之基本的動 ^程圖，-開始為啟始化步驟，控鮮獅會將該電容準位 1測計數單元24清除為零將該細 ，以及將該多功單元21所選擇之該觸控輸入點 器Μ之電荷清除(S403)。 著ί彳1航電倾，難卿元20會控錢源控制及 補你皁兀22產生一可變電流源經過該多功單 入點丨2之觸娜韻獅細(^7021㈣缝輪 200917130 元2物該電容偵測單元2= 了 =累積步驟，該控制單 ，上的f荷，累林元21轉職觸控電容 荷該電容準位量測I ^ f ^13上(_)，且每轉移一次電 ，並判斷哕咸、、目丨带々\皁兀24會計數一次，使計數值N=N+1(S406) 壓(v_s:· 13所累積的累積電壓(Vs)是否小於一參考電 (vs)，Γ—Γ」r該感測電容器13因累積電荷所產生的累積電壓 計數單元24=叙間内達!1 一參考電壓(ν_，且該電容準位量測 門，㈣。值1^又符合標準時’如該計數值耻90到110之 间^都表示手指有觸碰到觸控輸入點12(S408)。 固定=pm^(vs)仍小於該參考電壓(vref)則先判斷是否超過該 朴=，若否則_娜繼續累積電荷，若是則表示 容^則f石亚到觸控輸入點12，而進行下一觸控輸入點12的觸控電 舉例來說，假設當有某—觸控輸人點IS被觸碰時，其觸控電 1為10p，則該可變電流源對該觸控電容器14所需充電會產幻 ，单位的基本電荷量，而充電㈣間假·4你。若該感測電容 以3累積電荷所產生的累積電壓(Vs)在該固定時間(假設4卿㈣ 内達到參考電壓(Vref) ’而該電容準位量測計數單元Μ的計數值N 又符合標準(假設1〇〇次)時，則表示手指產生觸控。 接著本發明以三種狀態之動作流程說明以可變電流源解決其 「觸控電容太小時、其二雜散電容太大時、其三觸控點電^太相 近時的問題。假設在一般環境下，當手指觸碰時，該觸控電容器 4所產生的觸控電容值為i〇p，但在第一環境中}要求觸控電容值 W時仍能被偵測到；當在第二環境中，該手指觸碰時的觸控電容 值為l〇p ’而電路中卻有l〇〇p的雜散電容；當在第三環境中，要求 能偵測到相近的至少二個觸控輸入點12同時被觸碰時，該相近的 兩觸控電容皆能被分辨到。 200917130 在第一環境的實施例中，當要求手指可能離開觸控輸入點 10cm仍然要求可以被偵測到時，這時該觸控輸入點12的觸控電容 值可能為lp ’其動作流程仍和圖四的基本動作一樣，只是每-欠在 步驟S404時，該可變電流源對該觸控電容器14充電需要多花費忉 倍時間，才能產生1個單元的基本電荷量，因此本發明可以增加該 電流源控制及麵單元22產生可聰的可變電麵對該觸控電容 器14充電，如此仍然可在相同時間的偵測標準了·判 是否有判觸碰到。在-般環境下，此方式也可使 動速度計算方面，用以加速偵測是否有手指觸碰。 在第二環境的實施例中，觸控電容值的電容是1〇p，而雜散 容是l〇〇P的情形，請-併參關三及圖五所示，係為本發明^決 雜散電容存糊綱動作流糊。同樣地—開始為啟始化步驟，、 該控制單元20會賴電料位制計數單元24清除為零⑻叫，並 將該感測電舞13之電荷雜卿2)，以及賴乡功單切所選 之該觸控輸入點12之觸控電容器14之電荷清除(S5〇3)。 、接著進行預充電步驟，鮮元财控控制及 補侦單兀22產生-可㈣流驗過逐—對簡控電容㈣進行預 當充電完畢競行觸控電容歸的侧_步驟，該 元20會控繼餘_單元23齡蘭㈣容㈣上的電荷 積至§亥感測電容器13上卿5)。但由於整個電路中有獅p雜散電容 存在，因此若直接將簡控電容訊上的電荷累積至該感測電容 器13上’會將腳_雜散電如轉移至 造成誤侧。 因此每次在轉移觸控電容器14電荷時，該控 該電流源控麻鑛單元奴㈣鮮㈣錄 = 電流源，_透過該電容_單幼職❹m細3放電 12 200917130 鐘^以雜政電容所帶的電荷會先流走，此時該感測電容器13中所 到的電荷只剩下手指接觸的觸控電容器14所移轉的電荷。 每轉移一次電荷，該電容準位量測計數單元25會計數一次， ^十數值N=N+1 (S507)，朗斷該感測電容器13所的累積電壓(Vs) ^否小於一參考電壓(Vref)(S5〇8)，若累積電壓(Vs)等於或大於該 广考電壓(Vref)，且該電容準位量測計數單元％的計數值又符合標 準時，即表示手指有觸碰到觸控輸入點12(S5〇9)，若累積電壓(Vs) 仍小於該參考電壓(Vref)則先判斷是否超過該固定時間(S510)，若 否則回到步驟S503繼續累積電荷，若是則表示手指未觸碰到觸控 輸入點12，而進行下一觸控輸入點12的觸控電容偵測。 其中控制可變電流源除了可去除雜散電容之外，針對2個以上 相近觸控輸入點12需要更精確的被分辨觸碰時，也需要控制該感 測電容器13放掉電荷，達到標準偵測電壓的電荷降低，可提供該 電容準位量測計數單元24的計數值累積次數增加，以達到標準偵 測電壓。 ' 因為該感測電容器13累積電荷所產生的電壓(Vs)是固定的，不 可能無窮盡的累積電荷於該感測電容器13上，但到底要放掉該感 測電容器13多少電荷，然後再重新充電，這些都是可以經過記錄 及計算的，所以使用該感測電容器13的大小也變得較有彈性。 另外一般電容觸控測量時，解析度會有逐漸遞減的現象，因 為一般電容器的電荷移轉，無論是串聯或並聯，皆會發生所累積 電荷越來越少的現象，呈現指數形(exponential)飽和狀況，這時的 解析度和剛開始時差異很大，利用本發明控制可變電流源的彳貞測 方式，可記錄該感測電容器13所放掉的電荷量，以保持解析度的 不會有太大的差異，亦即該感測電容所累積的累積電壓(Vs)達到參 考電壓(Vref)值，並不需要太高，而且因放電很快，完全不影響操 作時間。 13 200917130 々呈Ϊ2參及圖六所示，係為本發明提高精確度之動作 數單元24清除為卿,，並將== 之電何4除_2)，以及將該多功單元所選擇之該觸控輸入點η 之觸控電容器14之電荷清除(S603)。 ° _制單元2G會控制該電赫控制及 .J70 ，彳變電流源經過逐—對該觸控電容器14進行預 充電完紐妨糖餘€荷_移1積步驟， 該電容偵測單元23轉移該觸控電容器14上的 電何，累積至s亥感測電容器13上(§6〇5)。 每轉移-次電荷’該電容準位量測計數單元24會計數一欠 =6)，並判_感測電細3所累積的累積霞⑽是^小於一 ，絲感測電容如累積電荷所產生的累積 電MVs) ’在固疋時間内達到該參考電壓(Vrd)，且該電容準位量 計數纽縣鮮時，喊科财難到觸控 為，高解析度本發明增加該❹,齡肋累積電荷的次數為 積電雖物小於參考電愿㈣則先判斷該電容 =里測叶數皁7024的計練Ν是否為m的借數(S6〇9),若否則回 ==6G3繼續累積電荷。糾為m的倍數，則該控制單元2〇會控 控制及補償單元22產生一負基本電荷量的可變電流源 電的電何量，再回到步驟S603重新累積電荷。 舉例綱’H個相鄰酬控輸人點I2被觸碰時，一個是 10ρ ’而另-個疋9.5p ’因為電容值相近造成不好分辨，就聊的觸 設可魏麵、產生丨解位的基本電荷量，m參數是 ’為m的倍數即為25,5〇,75,1〇〇,⑵，⑽…等等，而該電流源 200917130 控制及補償單元所產生可變電流源為負的10個單位的基本電荷量 ，所以每一次N為m倍數時，會放電10個單位的電荷量，因此1〇p 原本假設計數100次(N=100)時會有1000個單位的電荷量，再因經 過5次的放電流失5〇〇個單位的電荷量，總共是15〇〇個單位電荷量 ，最後當感測電容器13所累積的累積電壓(Vs)超過該參考電壓 (Vref)時，該N值為 1500/10=150。 就9.5p的觸控點而言，同樣計數1〇〇次(N=1〇〇)時，有⑴⑻個單 位的電荷量，但9.5p是會經過6次的放電流失6〇〇個單位的電荷量， 總共是1600個單元電荷量，最後該感測電容器13的累積電壓(Vs) 超過該參考電壓(Vref)時，該N值為1600/9.5=169，所以兩個觸控輸 入點12所累積計數值是150和169，差距是19，原本是1〇〇和106 ^ 差距是6，因此增加累積電荷次數是可以提高解析度，使相鄰觸控 輸^點的電容值相時，很容分辨出來，所以本發明利用控制可變 電流源的方法來控制感測電容器13電荷的放電，除了可去除雜散 電容外，相鄰觸控輸入點因為電容值相近，而造成不好分辨二 就可增加分辨的能力。 最後丄本發明利用可變電流源控制及補償電容感測方法，對 於速度计算也是有幫賴，由於多重.輸人點常常需要铺測移 動的速度，如果都用習知的高解析度方法去測量電容，並從電容 值的變化去瞭解鷄的速度及方向’實在是很浪料間的，本發 明可以增加可變電流源注人觸控輸人點12對觸控電容則4的充電 ☆以減>、忒電谷準位量測計數單元24的累計N值，用外差法估算電 谷值，就可以知道移動的速度及方向，例如手指線性移動時，尸 要愤測到任意2個觸控點時，利科差法就可以估算移動的速度^ 方f ’而不必逐—彳貞測計算每-個觸控電容器的電容值，所以可 以節省^餘的計算時間’ CPU的速度也可以降低，並比較省電。 耳成疋本發明確能藉上述所揭露之技術，提供一種電流源控 15 200917130 感測方法及震置，可以滿足在溫度或濕度的壤境 2二的影響下’或者規格變動下，仍能快速俄測手 二雨二广縣，迥然獨於習知者的設計，堪紐高整體之 ίϊΐ ’又其申請前未見於鶴或公開使用，誠已符合發明專 利之要件’爰依法提出發明專利申請。 凡精之圖式、說明，僅為本發明之實施例而已， 藝者當可依據上述之說明作其他種種之改良，而這 二改支仍屬於本發明之發明精神及以下所界定之專利範圍中。 【圖式簡單說明】 圖；圖係為1知4組觸控點的電容式觸控感測器電路架構示意 路架ίΓ發咖恤觸讀人料實_之感測器電 :程圖 ，五係為本發贿決雜輯容存在购的 圖六係為本發明提高精確度之動作流程示意圖:〇 及 【主要元件符號說明】 1 觸控感測器 2 觸控輸入點 3 感測電容器 5 觸控電容器 10 觸控感測電路 11 觸控感測器 12 觸控輸入點 200917130 13 感測電容器 14 觸控電容器 20 控制單元 21 多功單元 22 電流源控制及補償單元 23 電容偵測單元 24 電容準位量測計數單元Control and Compensation 22, a Capacitor Detector 23 and a Capacitor Level Measure Counter 24, as shown in FIG. 2, the touch sensor of the present invention is removed. One or more touch input points 12 are connected, and only one sensing capacitor 13 is connected. The control unit 20 is connected to the multi-function unit 21, the current source control and compensation unit 22, the capacitance detecting unit 23, and the capacitance level measuring and counting unit 24, which can control all the _ peach components by the 200917130 software. The multi-function unit 21 is further connected to the touch input point 12, the current source control and compensation unit 22, and the capacitance detecting unit 23. The flow source control and compensation unit 22 is connected to the capacitor_unit 23, and (4) The measuring unit 23 and the capacitance level clearing unit 24 are connected to both ends of the capacitor. The multi-function unit 21 is an analog-multi-power device, and can be controlled by the control unit 2 to select any of the touch input points and the difficult capacitors connected thereto. There are mainly two kinds of action states, and the current source is The control and compensation unit 22 generates a variable current source to precharge any of the touch input points 12, and the second is that the capacitance on the control capacitor H14 is transferred from the capacitor thin unit 23 to the viewing container 13. Generated with touch. The current source (4) and the replenishing element 22 can be used to transmit the pre-charge of the touch capacitors 14 to the capacitors, and the pre-charge can be performed on the capacitors. f action. Therefore, the capacitor system 2 is controlled by the controller 20, and the aspect is transferred and accumulating the electric power on the touch capacitor 14. In addition, the current source can be controlled and compensated for the increase or decrease of the voltage compensation. Then, the capacitance level ^ unit 24' #数0Hake detection unit 23 shifts the electric current on the vacuum capacitor 14 to the slit on the sensing capacitor, so that the lying is fresh. Please refer to - and refer to FIG. 3 and FIG. 4, which are the basic motion diagrams of the embodiment of the present invention, starting from the initiation step, and the control lion will clear the capacitance level 1 measurement and counting unit 24. The light is zero, and the charge of the touch input device selected by the multi-function unit 21 is cleared (S403).彳 彳 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 航 20 20 20 产生 产生 产生 产生 产生 产生 产生 产生 产生 产生 产生The capacitance detection unit 2==accumulation step, the control unit, the f-load on the control unit, the tired forest element 21, the transfer capacitance load, the capacitance level measurement I ^ f ^13 (_), And each time the electricity is transferred, and it is judged that the salty, the eyelids, and the saponins 24 will be counted once, so that the count value N=N+1 (S406) is pressed (v_s: · 13 accumulated cumulative voltage (Vs) Whether it is less than a reference power (vs), 累积 Γ r 该 感 感 感 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 累积 累积 累积 累积 累积 累积 累积 累积Door, (4). When the value 1^ meets the standard, 'If the count value is between 90 and 110, ^ means that the finger touches the touch input point 12 (S408). Fixed = pm^(vs) is still smaller than the reference voltage (vref) first judge whether it exceeds the Park =, if otherwise, _ Na continues to accumulate charge, if it is, then it means that the device touches the touch input point 12, and the touch control of the next touch input point 12 is exemplified. For that, When there is a touch input point IS is touched, the touch power 1 is 10p, and the variable current source needs to charge the touch capacitor 14 to generate a magical amount of basic charge. Charging (four) false ·4. If the sensing capacitor is accumulated voltage (Vs) generated by 3 accumulated charge at the fixed time (assuming 4 (four) reaches the reference voltage (Vref)' and the capacitance level measurement count When the count value N of the unit 又 meets the standard (assuming 1 )), it means that the finger generates touch. Next, the present invention describes the operation of the three states with a variable current source to solve the problem that the "touch capacitance is too small, When the two stray capacitances are too large, the three touch points are too close to each other. It is assumed that in the general environment, when the finger touches, the touch capacitance generated by the touch capacitor 4 is i〇p, However, in the first environment, when the touch capacitance value W is required, it can still be detected; when in the second environment, the touch capacitance value when the finger touches is l〇p ' and the circuit has l〇杂p stray capacitance; when in the third environment, it is required to detect at least two touch input points 12 When the touch is touched, the two similar touch capacitors can be resolved. 200917130 In the first environment embodiment, when the finger is required to leave the touch input point 10cm, the request can still be detected, then the The touch capacitance value of the touch input point 12 may be lp 'the operation flow is still the same as the basic action of FIG. 4, but the variable current source charges the touch capacitor 14 for each time owing to step S404. By doubling the time, the basic charge amount of one unit can be generated, so the present invention can increase the current source control and the surface unit 22 generates a variable variable electric charge to face the touch capacitor 14, so that it can still be at the same time. The detection standard is judged whether there is a judgment. In the general environment, this method can also be used to speed up the detection of whether there is a finger touch. In the embodiment of the second environment, the capacitance of the touch capacitance value is 1 〇p, and the stray capacitance is the case of l 〇〇 P, please - and refer to the third and the fifth figure, which is the invention The stray capacitance saves the paste action. Similarly, starting with the initiation step, the control unit 20 will clear the zero level (8) call by the electric level calculation unit 24, and will sense the electric charge of the electric dance 13 (2), and the Laixiang work list. The charge removal of the touch capacitor 14 of the selected touch input point 12 is cut (S5〇3). Then, the pre-charging step is performed, and the fresh element financial control and the reconnaissance unit 22 are generated--(four) flow-testing--the simple control capacitor (4) is pre-charged to complete the side of the touch capacitor returning step _step, the element 20 will control the remaining _ unit 23-year-old blue (four) capacity (four) on the charge product to § hai sensing capacitor 13 on the Qing 5). However, since the lion p stray capacitance exists in the whole circuit, if the charge on the simple control capacitor is directly accumulated on the sensing capacitor 13, the foot_stray electricity is transferred to the wrong side. Therefore, each time the charge of the touch capacitor 14 is transferred, the current source is controlled to control the unit of the miner (four) fresh (four) recorded = current source, _ through the capacitor _ single child ❹ m fine 3 discharge 12 200917130 clock ^ with a hybrid capacitor The charged charge will flow first. At this time, the charge in the sensing capacitor 13 is only the charge transferred by the touch capacitor 14 touched by the finger. Each time the charge is transferred, the capacitance level measurement and counting unit 25 counts once, ^ ten value N = N + 1 (S507), and the cumulative voltage (Vs) of the sensing capacitor 13 is broken. Voltage (Vref) (S5〇8), if the accumulated voltage (Vs) is equal to or greater than the wide-ranging voltage (Vref), and the count value of the capacitance level measuring unit % meets the standard, it means that the finger touches To the touch input point 12 (S5〇9), if the accumulated voltage (Vs) is still less than the reference voltage (Vref), it is first determined whether the fixed time is exceeded (S510), otherwise, the process returns to step S503 to continue accumulating charges, and if so, It means that the finger does not touch the touch input point 12, and the touch capacitance detection of the next touch input point 12 is performed. Wherein the control variable current source can remove the stray capacitance, and when more than two different touch input points 12 need to be more accurately resolved, the sensing capacitor 13 needs to be controlled to discharge the charge, and the standard detection is achieved. The charge reduction of the measured voltage can provide an increase in the cumulative number of counts of the capacitance level measurement and counting unit 24 to achieve the standard detection voltage. Because the voltage (Vs) generated by the sensing capacitor 13 is fixed, it is impossible to accumulate an infinite amount of charge on the sensing capacitor 13, but how much charge is to be discharged from the sensing capacitor 13, and then Recharging, these can be recorded and calculated, so the size of the sensing capacitor 13 is also more flexible. In addition, in general capacitive touch measurement, the resolution will gradually decrease, because the charge transfer of a general capacitor, whether in series or parallel, will result in less and less accumulated charge, exponential (exponential) In the saturation state, the resolution at this time is very different from that at the beginning. By using the method of controlling the variable current source of the present invention, the amount of charge discharged by the sensing capacitor 13 can be recorded to maintain the resolution. There is a big difference, that is, the accumulated voltage (Vs) accumulated by the sensing capacitor reaches the reference voltage (Vref) value, and does not need to be too high, and the discharge is fast, and the operation time is not affected at all. 13 200917130 々 Ϊ 2 refers to the figure shown in Figure 6, which is used to improve the accuracy of the action unit 24 is cleared to Qing, and == = 4 divided _2), and the multi-unit selected The charge of the touch capacitor 14 of the touch input point η is cleared (S603). ° _ system 2G will control the galvanic control and .J70, the enthalpy current source is pre-charged by the touch capacitor 14 , and the capacitance detecting unit 23 is pre-charged. The electricity on the touch capacitor 14 is transferred to the s-shear capacitor 13 (§6〇5). Each of the transfer-time charges 'the capacitance level measurement and counting unit 24 counts one minus=6), and judges that the accumulated Xia (10) accumulated by the sensing electric thin 3 is less than one, and the silk sensing capacitance such as the accumulated electric charge The generated accumulated electric MVs) 'the reference voltage (Vrd) is reached during the fixed time, and when the capacitance level is counted as New York, it is difficult to touch the touch, and the high resolution is increased by the present invention. The number of accumulated electric charges of the ribs is that the accumulated electricity is less than the reference electric power (4), first determine whether the capacitance = the number of the measured number of soaps 7024 is m (m6), if not, then ==6G3 Continue to accumulate charge. When the correction is a multiple of m, the control unit 2 controls the control and compensation unit 22 to generate a negative current source of a negative basic charge amount, and returns to step S603 to reaccumulate the charge. For example, when the H adjacent touch control input point I2 is touched, one is 10ρ ' and the other one is 疋 9.5p ' because the capacitance values are close to each other, which makes it difficult to distinguish, and the touch can be used to create a surface. The basic charge amount of the solution, the m parameter is 'multiples of m is 25,5〇, 75,1〇〇, (2), (10)...etc., and the current source 200917130 controls and compensates for the variable current source generated by the unit It is a basic charge of 10 units of negative, so every time N is a multiple of m, 10 units of charge are discharged, so 1〇p is assumed to count 100 times (N=100), there will be 1000 units. The amount of charge is further lost by 5 units of charge after 5 times of discharge, for a total of 15 units of charge, and finally, when the accumulated voltage (Vs) accumulated by the sensing capacitor 13 exceeds the reference voltage (Vref) When the N value is 1500/10=150. For the 9.5p touch point, when counting 1 time (N=1〇〇), there is (1) (8) units of charge, but 9.5p is 6 units of discharge after 6 times of discharge. The amount of charge is a total of 1600 unit charge amounts. When the accumulated voltage (Vs) of the sensing capacitor 13 exceeds the reference voltage (Vref), the value of N is 1600/9.5=169, so the two touch input points 12 The accumulated count value is 150 and 169, the difference is 19, the original is 1〇〇 and 106^ The difference is 6, so increasing the cumulative charge number can improve the resolution, so that the capacitance value of the adjacent touch input point is phased. It is very easy to distinguish, so the present invention utilizes a method of controlling a variable current source to control the discharge of the charge of the sensing capacitor 13. In addition to removing stray capacitance, adjacent touch input points are not well resolved because of similar capacitance values. Second, you can increase the ability to distinguish. Finally, the present invention utilizes a variable current source control and compensation capacitive sensing method, which is also helpful for speed calculation. Since multiple input points often need to be measured and moved, if they use conventional high-resolution methods. Measuring the capacitance and understanding the speed and direction of the chicken from the change of the capacitance value is really very difficult. The invention can increase the variable current source to inject the touch input point 12 to charge the touch capacitor 4 By subtracting the cumulative N value of the counting unit 24 and measuring the electric valley value by the heterodyne method, the speed and direction of the movement can be known. For example, when the finger moves linearly, the corpse is arbitrarily measured. When two touch points are used, the Ricod difference method can estimate the speed of the movement ^ square f ' without having to calculate the capacitance value of each touch capacitor, so it can save the calculation time of the CPU' Speed can also be reduced and compared to save power. The invention can indeed provide a current source control 15 200917130 sensing method and a shock by the above-mentioned disclosed technology, which can satisfy the influence of the temperature or humidity of the soil 2 or the specification change, The fast Russian tester Eryu Erguang County, completely independent of the design of the savvy, can not be seen before the application of the crane or public use, Cheng has met the requirements of the invention patents 爰 legally filed invention patents Application. The drawings and descriptions of the present invention are only examples of the present invention, and the artist can make other various improvements according to the above description, and the two modified branches still belong to the inventive spirit of the present invention and the patent scope defined below. in. [Simple diagram of the diagram] Figure; diagram is a schematic diagram of the capacitive touch sensor circuit structure of 4 groups of 4 touch points ί Γ 咖 咖 咖 触 人 人 _ 感 感 感 感 : : : : : Figure 5 is a schematic diagram of the process of improving the accuracy of the present invention: 〇 and [main component symbol description] 1 touch sensor 2 touch input point 3 sensing capacitor 5 touch capacitor 10 touch sensing circuit 11 touch sensor 12 touch input point 200917130 13 sensing capacitor 14 touch capacitor 20 control unit 21 multi-function unit 22 current source control and compensation unit 23 capacitance detecting unit Capacitance level measurement and counting unit