TWI409688B

TWI409688B - Touch panel and touch input device equipped with the touch panel

Info

Publication number: TWI409688B
Application number: TW99117483A
Authority: TW
Inventors: Song-Ling Yang
Original assignee: Hon Hai Prec Ind Co Ltd
Priority date: 2010-05-31
Filing date: 2010-05-31
Publication date: 2013-09-21
Also published as: TW201142684A

Abstract

A touch input device includes a touch panel and a control circuit. The control circuit includes a first current sensor, a second current sensor, a constant-voltage power supply and a controller. The touch panel includes a covering layer, an electrode layer and a resistor layer. The resistor layer includes a linear resistance covering the whole plane of the resistor layer. When the touch panel is touched by a user, the controller determines the touch position according to the current detected by the first current sensor and the second current sensor.

Description

觸摸面板及應用該觸摸面板的觸摸輸入裝置 Touch panel and touch input device applying the same

本發明涉及一種觸摸面板及應用該觸摸面板的觸摸輸入裝置，尤其涉及一種電阻式觸摸面板及應用該電阻式觸摸面板的觸摸輸入裝置。 The present invention relates to a touch panel and a touch input device using the touch panel, and more particularly to a resistive touch panel and a touch input device using the same.

近年來，電子裝置如手機、PDA(personal digital assistant，個人數位助理)、電子相框等功能越來越強大，也越來越智慧化。其中，在電子裝置的用戶輸入方面，電子裝置的輸入設備由機械按鍵到觸摸按鍵，然後到觸摸屏，大大提高了電子裝置的易操作性。目前的觸摸裝置按其所採用的觸摸感應技術大致分為電容式觸摸裝置、電阻式觸摸裝置、表面聲波式觸摸裝置、紅外線觸摸裝置等。而其中電容式觸摸屏與電阻式觸摸屏應用最為廣泛。 In recent years, electronic devices such as mobile phones, PDAs (personal digital assistants), and electronic photo frames have become more and more powerful and more intelligent. Wherein, in terms of user input of the electronic device, the input device of the electronic device is mechanically pressed to the touch button and then to the touch screen, which greatly improves the ease of operation of the electronic device. Current touch devices are roughly classified into capacitive touch devices, resistive touch devices, surface acoustic wave touch devices, infrared touch devices, and the like according to the touch sensing technology employed. Among them, capacitive touch screens and resistive touch screens are the most widely used.

在電容式觸摸技術中，觸摸屏表面塗覆了一層具有電荷儲存能力的觸摸電極，當觸摸屏表面被手指觸摸時，觸摸電極表面就會有一定的電荷轉移到人體，為了恢復這些電荷損失，電荷會從觸摸電極的四角補充過來，觸摸電極上的電流發生改變且各方向補充的電荷量和觸摸點的距離成比例，將測量結果與基準值進行比較就可以得到觸摸點的位置。電容式觸摸屏可以實現同時檢測複數觸摸點，但成本通常較高。 In the capacitive touch technology, the touch screen surface is coated with a touch electrode having a charge storage capability. When the surface of the touch screen is touched by a finger, a certain charge is transferred to the human body on the surface of the touch electrode, and in order to restore these charge losses, the charge will be Replenished from the four corners of the touch electrode, the current on the touch electrode changes and the amount of charge replenished in each direction is proportional to the distance of the touch point, which will be measured The result is compared with the reference value to get the position of the touch point. Capacitive touch screens enable simultaneous detection of multiple touch points, but the cost is usually higher.

在電阻式觸摸技術中，電阻式觸摸屏是一種多層的複合薄膜，有一層玻璃或者有機玻璃作為基板，基板上表面塗有一層銦錫氧化物(ITO)導電層，通常此ITO導電層作為工作層，在工作層ITO上面刻有精密的電極網路，並在橫豎兩個方向接通有電壓場。在基板上蓋有一層外表面硬化處理、光滑防刮的柔性塑膠覆蓋層，其內表面也塗有一層ITO導電層，通常此ITO導電層作為觸摸電極，在基板與覆蓋層之間通過若干絕緣透明間隔物將兩者分隔開來。當手指觸碰觸摸屏時，觸摸層發生彈性形變，原本相互隔離的兩層ITO導電層在觸摸點處相互接觸，從而使觸摸電極上的電壓由零變為非零狀態，將測量得到的電壓值進行計算即可得到觸摸點的位置。 In resistive touch technology, the resistive touch screen is a multi-layer composite film with a layer of glass or plexiglass as the substrate. The upper surface of the substrate is coated with a layer of indium tin oxide (ITO) conductive layer. Usually, the ITO conductive layer is used as a working layer. A precise electrode network is engraved on the working layer ITO, and a voltage field is connected in both the horizontal and vertical directions. The substrate is covered with a layer of outer surface hardened, smooth and scratch-resistant flexible plastic covering layer, and the inner surface is also coated with an ITO conductive layer. Usually, the ITO conductive layer is used as a touch electrode, and a plurality of insulating transparent layers are passed between the substrate and the covering layer. The spacer separates the two. When the finger touches the touch screen, the touch layer is elastically deformed, and the two ITO conductive layers that are originally isolated from each other contact each other at the touch point, so that the voltage on the touch electrode changes from zero to a non-zero state, and the measured voltage value is measured. The calculation can be done to get the position of the touch point.

然而，上述電阻式觸摸屏雖然成本較為低廉，但是只能偵測到一點的觸摸狀態，缺乏同時偵測複數觸摸點的能力，這在很大程度上制約著電阻式觸摸屏的運用。 However, although the above-mentioned resistive touch screen is relatively inexpensive, it can only detect a touch state and lack the ability to simultaneously detect a plurality of touch points, which largely restricts the use of the resistive touch screen.

有鑒於此，有必要提供一種能偵測複數個觸摸點的電阻式觸摸面板及應用該電阻式觸摸面板的觸摸輸入裝置。 In view of the above, it is necessary to provide a resistive touch panel capable of detecting a plurality of touch points and a touch input device to which the resistive touch panel is applied.

一種觸摸面板，包括覆蓋層，貼附於覆蓋層內表面的電極層，貼附於基板上的電阻層，該電阻層上設有佈滿整個工作面的電阻線；電極層與電阻層之間通過複數個絕緣的間隔物分隔開來。其中，在電極層與電阻層之間形成一電勢差，當用戶觸摸該觸摸面板時，覆蓋層發生彈性形變，電極層與電阻層在接觸點相接觸，電阻線與電極層連成回路，電阻線上的電流發生變化。 A touch panel comprising a cover layer, an electrode layer attached to an inner surface of the cover layer, and a resistive layer attached to the substrate, wherein the resistive layer is provided with a resistance wire covering the entire working surface; between the electrode layer and the resistance layer Separated by a plurality of insulated spacers. Wherein, a potential difference is formed between the electrode layer and the resistance layer, when used When the user touches the touch panel, the cover layer is elastically deformed, the electrode layer and the resistance layer are in contact at the contact point, and the resistance wire and the electrode layer are connected in a loop, and the current on the resistance line changes.

一種觸摸輸入裝置，包括觸摸面板和控制電路，該控制電路包括第一電流感應器、第二電流感應器、恒壓電源以及控制器，該觸摸面板包括覆蓋層、電極層、電阻層。電極層貼附於覆蓋層內表面，該電極層與恒壓電源相連接。該電阻層上設有佈滿整個工作面的電阻線，電阻線的第一端子與第一電流感應器相連接，第二端子與第二電流感應器相連接。電極層與電阻層之間通過複數個絕緣的間隔物分隔開來。其中，當用戶觸摸該觸摸面板時，覆蓋層發生彈性形變，電極層與電阻層在接觸點相接觸，電阻線與電極層連成回路，所述控制器根據第一電流感應器與第二電流感應器測量得到的電流值確定觸摸點的位置。 A touch input device includes a touch panel and a control circuit. The control circuit includes a first current sensor, a second current sensor, a constant voltage power source, and a controller. The touch panel includes a cover layer, an electrode layer, and a resistance layer. The electrode layer is attached to the inner surface of the cover layer, and the electrode layer is connected to the constant voltage power source. The resistance layer is provided with a resistance wire covering the entire working surface, the first terminal of the resistance wire is connected to the first current inductor, and the second terminal is connected to the second current inductor. The electrode layer and the resistive layer are separated by a plurality of insulating spacers. Wherein, when the user touches the touch panel, the cover layer is elastically deformed, the electrode layer and the resistance layer are in contact at the contact point, and the resistance wire and the electrode layer are connected in a loop, and the controller is configured according to the first current sensor and the second current The current value measured by the sensor determines the position of the touch point.

本發明提供的電阻式觸摸面板及應用該電阻式觸摸面板的觸摸輸入裝置，通過對電阻線第一端子和第二端子電流的檢測，可以計算出觸摸點的位置，並且當觸摸輸入裝置上同時存在兩個觸摸點時，也能夠準確的定位兩個觸摸點的位置。 The resistive touch panel provided by the present invention and the touch input device using the resistive touch panel can calculate the position of the touch point by detecting the current of the first terminal and the second terminal of the resistance wire, and simultaneously when the touch input device is simultaneously When there are two touch points, the position of the two touch points can also be accurately located.

100‧‧‧觸摸輸入裝置 100‧‧‧Touch input device

10‧‧‧觸摸面板 10‧‧‧ touch panel

11‧‧‧覆蓋層 11‧‧‧ Coverage

12‧‧‧電極層 12‧‧‧electrode layer

13‧‧‧絕緣間隔物 13‧‧‧Insulation spacers

14‧‧‧電阻層 14‧‧‧resistance layer

15‧‧‧基板 15‧‧‧Substrate

20‧‧‧電阻線 20‧‧‧resistance line

21‧‧‧第一端子 21‧‧‧First terminal

22‧‧‧第二端子 22‧‧‧second terminal

31‧‧‧第一電流感應器 31‧‧‧First current sensor

32‧‧‧第二電流感應器 32‧‧‧Second current sensor

40‧‧‧恒壓電源 40‧‧‧Constant voltage power supply

50‧‧‧控制器 50‧‧‧ Controller

61、62‧‧‧分壓電阻 61, 62‧‧‧ voltage divider resistor

70‧‧‧控制電路 70‧‧‧Control circuit

S101、S102、S103‧‧‧步驟 S101, S102, S103‧‧‧ steps

圖1為為本發明觸摸輸入裝置的觸摸面板結構示意圖。 1 is a schematic structural view of a touch panel of a touch input device of the present invention.

圖2為本發明觸摸輸入裝置的觸摸面板電阻層結構示意圖。 2 is a schematic structural view of a touch panel resistance layer of the touch input device of the present invention.

圖3為本發明觸摸輸入裝置結構示意圖。 3 is a schematic structural view of a touch input device of the present invention.

圖4為本發明觸摸輸入裝置的觸摸面板坐標示意圖。 4 is a schematic diagram of coordinates of a touch panel of the touch input device of the present invention.

圖5為本發明觸摸輸入裝置的觸摸面板被一個觸摸點觸摸時的等效電路圖。 FIG. 5 is an equivalent circuit diagram of the touch panel of the touch input device of the present invention when touched by a touch point.

圖6為本發明觸摸輸入裝置的觸摸面板被兩個個觸摸點觸摸時的等效電路圖。 FIG. 6 is an equivalent circuit diagram of the touch panel of the touch input device of the present invention when touched by two touch points.

圖7為本發明觸摸輸入裝置的觸摸面板被三個觸摸點觸摸時的等效電路圖。 FIG. 7 is an equivalent circuit diagram of the touch panel of the touch input device of the present invention when it is touched by three touch points.

圖8為本發明觸摸輸入裝置的工作流程圖。 FIG. 8 is a flow chart showing the operation of the touch input device of the present invention.

請參考圖1，觸摸面板10包括覆蓋層11、電極層12、絕緣間隔物13、電阻層14以及基板15。在本實例中的觸摸面板10應用於電子裝置顯示幕之上，因此觸摸面板10需採用透明的透光率較好的材料。觸摸面板10也可採用其他非透明材料製造，其主要用途可以用於觸控板，觸控開關等。 Referring to FIG. 1 , the touch panel 10 includes a cover layer 11 , an electrode layer 12 , an insulating spacer 13 , a resistive layer 14 , and a substrate 15 . The touch panel 10 in this example is applied to the display screen of the electronic device, and therefore the touch panel 10 needs to adopt a material having a transparent light transmittance. The touch panel 10 can also be fabricated from other non-transparent materials, and its main use can be used for touch panels, touch switches, and the like.

覆蓋層11採用透明的柔性塑膠材料，通常在覆蓋層11的外表面還要進行表面硬化處理，使其具有光滑防刮的功能。電極層12貼附於覆蓋層11的內表面，通常電極層12採用具有高透光性的導電銦錫氧化物(ITO)材料。電極層12與電阻層14之間通過複數個柔性的絕緣間隔物13組成的柵格陣列分隔開來，絕緣間隔物13通常採用透明的柔性塑膠材料。基板15通常採用玻璃基板或者有機玻璃基板材料。 The cover layer 11 is made of a transparent flexible plastic material, and is usually subjected to a surface hardening treatment on the outer surface of the cover layer 11, so that it has a smooth scratch-proof function. The electrode layer 12 is attached to the inner surface of the cover layer 11, and the electrode layer 12 is usually made of a conductive indium tin oxide (ITO) material having high light transmittance. The electrode layer 12 and the resistive layer 14 are separated by a grid array of a plurality of flexible insulating spacers 13. The insulating spacers 13 are generally made of a transparent flexible plastic material. The substrate 15 is usually made of a glass substrate or an organic glass substrate material.

請一併參閱圖1和圖2，電阻層14貼附於基板15的上方，電阻層14上蝕刻有電阻率均勻的透明帶狀電阻線20。電阻線20的第一端子21和第二端子22分別設置於電阻層14的兩個對角處，在電阻層14上反復彎折，即電阻線20從電阻層14一個角出發沿一側邊延伸至對邊折回，反復彎折至電阻層14另一對角處，形成一弓形結構。 Referring to FIG. 1 and FIG. 2 together, the resistive layer 14 is attached to the upper surface of the substrate 15, and the resistor A transparent strip-shaped resistor wire 20 having a uniform resistivity is etched on the layer 14. The first terminal 21 and the second terminal 22 of the resistance wire 20 are respectively disposed at two opposite corners of the resistance layer 14, and are repeatedly bent on the resistance layer 14, that is, the resistance wire 20 starts from one corner of the resistance layer 14 along one side. It extends to the opposite side and is repeatedly bent to the other opposite corner of the resistance layer 14 to form an arcuate structure.

請參閱圖1和圖3，所述觸摸輸入裝置100包括該觸摸面板10以及控制電路70，該控制電路包括第一電流感應器31、第二電流感應器32、恒壓電源40以及控制器50。電極層12與恒壓電源40電連接，使電極層12具有一電壓值。電阻線20的第一端子21與第一電流感應器31連接，電阻線20的第二端子22與第二電流感應器32連接，第一電流感應器31和第二電流感應器32均與控制器50連接。當用戶觸摸該觸摸面板10時，電極層12與電阻層14上的電阻線20相接觸，使得電阻線20接觸電極層12的接觸點具有相應的電壓值U，從而所述接觸點到第一端子21之間以及所述接觸點到第二端子22之間產生電流。第一電流感應器31與第二電流感應器32用以測量電路中電流值的大小，並將所述偵測的電流值傳送給控制器50。該控制器50可以根據第一電流感應器31與第二電流感應器32偵測到的電流值，判斷觸摸面板10上存在幾個觸摸點並計算觸摸點的位置。 Referring to FIGS. 1 and 3 , the touch input device 100 includes the touch panel 10 and a control circuit 70 . The control circuit includes a first current sensor 31 , a second current sensor 32 , a constant voltage power source 40 , and a controller 50 . . The electrode layer 12 is electrically connected to the constant voltage source 40 such that the electrode layer 12 has a voltage value. The first terminal 21 of the resistance wire 20 is connected to the first current sensor 31, the second terminal 22 of the resistance wire 20 is connected to the second current sensor 32, and the first current sensor 31 and the second current sensor 32 are both controlled. The device 50 is connected. When the user touches the touch panel 10, the electrode layer 12 is in contact with the resistance wire 20 on the resistance layer 14, such that the contact point of the resistance wire 20 contacting the electrode layer 12 has a corresponding voltage value U, so that the contact point is first A current is generated between the terminals 21 and between the contact point and the second terminal 22. The first current sensor 31 and the second current sensor 32 are used to measure the magnitude of the current value in the circuit and transmit the detected current value to the controller 50. The controller 50 can determine that there are several touch points on the touch panel 10 and calculate the position of the touch point based on the current values detected by the first current sensor 31 and the second current sensor 32.

優選的，在第一端子21與第一電流感應器31設有分壓電阻61，其電阻值為R₁；在第二端子22與第二電流感應器32設有一分壓電阻62，其電阻值為R₂。分壓電阻61與62的作用是減小觸摸面板10的電流變化範圍，例如恒壓電源40輸出電壓為5伏，電阻線20的第一端子21到第二端子22之間的總電阻為4000歐姆，分壓電阻61與62為1000歐姆，當觸摸面板10被觸摸時，電阻線20自觸摸點位置至第一端子21的電阻與分壓電阻61串聯，則第一電流感應器31檢測到的電流在1毫安培至5毫安培之間，同理，分壓電阻62作用與分壓電阻61相當。如果去掉分壓電阻61與62，當觸摸面板10被觸摸時，則第一電流感應器31和第二電流感應器32檢測到的電流在1.25毫安培至無窮大，會增加第一電流感應器31和第二電流感應器32的工作範圍，再者觸摸面板10上產生太大的電流也會對電子設備的正常工作產生不利影響。 Preferably, the first terminal 21 and the first current sensor 31 are provided with a voltage dividing resistor 61 having a resistance value R ₁ ; the second terminal 22 and the second current sensor 32 are provided with a voltage dividing resistor 62, and the resistance thereof. The value is R ₂ . The functions of the voltage dividing resistors 61 and 62 are to reduce the range of current variation of the touch panel 10, for example, the output voltage of the constant voltage power source 40 is 5 volts, and the total resistance between the first terminal 21 and the second terminal 22 of the resistance wire 20 is 4000. Ohm, the voltage dividing resistors 61 and 62 are 1000 ohms. When the touch panel 10 is touched, the resistance of the resistance wire 20 from the touch point position to the first terminal 21 is connected in series with the voltage dividing resistor 61, and the first current sensor 31 detects The current is between 1 mA and 5 mA. Similarly, the voltage dividing resistor 62 acts as the voltage dividing resistor 61. If the voltage dividing resistors 61 and 62 are removed, when the touch panel 10 is touched, the current detected by the first current sensor 31 and the second current sensor 32 is 1.25 mA to infinity, which increases the first current sensor 31. And the working range of the second current sensor 32, and the excessive current generated on the touch panel 10 may also adversely affect the normal operation of the electronic device.

所述觸摸輸入裝置100的檢測原理如下，請一併結合圖4，設所述電阻線20的單位長度電阻是M₀歐姆/米，長度為L，設所述分佈在電阻層14上的電阻線20的點與一坐標系上的座標一一映射，設第一端子21為觸摸面板的座標原點(0，0)，第二端子22為(X₀，Y₀)，電阻線20彎折後相鄰兩段中心間距均為T₀。 The detection principle of the touch input device 100 is as follows. Please refer to FIG. 4 together, and the resistance of the resistance wire 20 is M ₀ ohm/meter and the length is L. The resistance distributed on the resistance layer 14 is set. The point of the line 20 is mapped one by one with the coordinates on a coordinate system. The first terminal 21 is the coordinate origin (0, 0) of the touch panel, the second terminal 22 is (X ₀ , Y ₀ ), and the resistance line 20 is bent. After the fold, the center distance between two adjacent segments is T ₀ .

恒壓電源40提供的電壓U和分壓電阻61、62的電阻值R₁、R₂已知，電極層12的電阻以及電極層12與電阻層14的接觸電阻遠小於電阻M₁、M₂、R₁、R₂，故忽略不計。當觸摸面板10被觸摸時，電極層12與電阻層14上的電阻線20相接觸，使得電阻線20接觸電極層12的接觸點具有相應的電壓值U，此時第一電流感應器31測得電流值為I₁，第二電流感應器32測得電流值為I₂。 The voltage U supplied from the constant voltage source 40 and the resistance values R ₁ and R ₂ of the voltage dividing resistors 61 and 62 are known, and the resistance of the electrode layer 12 and the contact resistance of the electrode layer 12 and the resistance layer 14 are much smaller than the resistances M ₁ and M _{2 .} , R ₁ , R ₂ , so neglected. When the touch panel 10 is touched, the electrode layer 12 is in contact with the resistance wire 20 on the resistance layer 14, such that the contact point of the resistance wire 20 contacting the electrode layer 12 has a corresponding voltage value U, and the first current sensor 31 measures The current value is I ₁ and the second current sensor 32 measures the current value I ₂ .

請參考圖2，圖3和圖5，圖5為觸摸面板10上僅有一個觸摸點時觸摸面板10的等效電路圖。電阻線20自觸摸點A至第一端子21之間的電阻為M₁、長度為L₁，電阻線20自觸摸點A至第二端子22之間的電阻為M₂、長度為L₂，M₁與M₂並聯，且M₁+M₂=M₀*L，L₁+L₂=L。在本實施方式中，當僅有一個觸摸點A時，控制器50根據第一電流感應器31所測得的電流值I₁計算觸摸點A的座標，在其他實施方式中，控制器50也可以根據第二電流感應器32測得電流值為I₂來計算觸摸點A的座標，其結果相同。設觸摸點A的座標為(X₁，Y₁)，該控制器50計算觸摸點A座標的具體計算方法如下：首先根據第一電流感應器31所測得的電流值I₁計算觸摸點A至第一端子21之間的電阻為M₁，計算公式為：M₁=U/I₁-R₁。然後，計算從觸摸點A到第一端子21的電阻線20的長度L₁=M₁/M₀。最後，將L₁除以(Y₀+T₀)得到整數K₁和餘數L₁₁，參考公式L₁=K₁(Y₀+T₀)+L₁₁，則可以得到觸摸點A的座標：當L₁₁≦Y₀，K₁為奇數時，觸摸點A的座標為(K₁T₀，Y₀-L₁₁)；當L₁₁≦Y₀，K₁為偶數時，觸摸點A的座標為(K₁T₀，L₁₁)；當L₁₁>Y₀，K₁為奇數時，觸摸點A的座標為[K₁T₀+(L₁₁-Y₀)，0]；當L₁₁>Y₀，K₁為偶數時，觸摸點A的座標為[K₁T₀+(L₁₁-Y₀)，Y₀]。 Please refer to FIG. 2, FIG. 3 and FIG. 5. FIG. 5 is an equivalent circuit diagram of the touch panel 10 when there is only one touch point on the touch panel 10. The resistance between the resistance line 20 from the touch point A to the first terminal 21 is M ₁ and the length is L ₁ , and the resistance between the resistance line 20 from the touch point A to the second terminal 22 is M ₂ and the length is L ₂ . M ₁ is connected in parallel with M ₂ , and M ₁ + M ₂ = M ₀ * L, L ₁ + L ₂ = L. In the present embodiment, when there is only one touch point A, the controller 50 calculates the coordinates of the touch point A according to the current value I ₁ measured by the first current sensor 31. In other embodiments, the controller 50 also The coordinates of the touch point A can be calculated based on the current value I ₂ measured by the second current sensor 32, and the result is the same. The coordinate of the touch point A is (X ₁ , Y ₁ ), and the specific calculation method of the controller 50 for calculating the touch point A coordinate is as follows: First, the touch point A is calculated according to the current value I ₁ measured by the first current sensor 31. The resistance between the first terminals 21 is M ₁ and is calculated as: M ₁ =U/I ₁ -R ₁ . Then, the length L ₁ = M ₁ / M ₀ of the resistance wire 20 from the touch point A to the first terminal 21 is calculated. Finally, dividing L ₁ by (Y ₀ +T ₀ ) yields the integer K ₁ and the remainder L ₁₁ . With reference to the formula L ₁ =K ₁ (Y ₀ +T ₀ )+L ₁₁ , the coordinates of the touch point A can be obtained: When L ₁₁ ≦Y ₀ , K ₁ is an odd number, the coordinates of the touch point A are (K ₁ T ₀ , Y ₀ -L ₁₁ ); when L ₁₁ ≦Y ₀ , K ₁ is an even number, the coordinates of the touch point A are touched Is (K ₁ T ₀ , L ₁₁ ); when L ₁₁ >Y ₀ , K ₁ is an odd number, the coordinate of touch point A is [K ₁ T ₀ +(L ₁₁ -Y ₀ ), 0]; when L ₁₁ >Y ₀ , when K ₁ is an even number, the coordinates of touch point A are [K ₁ T ₀ +(L ₁₁ -Y ₀ ), Y ₀ ].

請參考圖2，圖3和圖6，圖6為觸摸面板10存在兩個觸摸點時觸摸面板10的等效電路圖。當觸摸面板10被觸摸時，電極層12在觸摸點B和觸摸點C與電阻層14的電阻線20相接觸。電阻線20自觸摸點B至第一端子21之間的電阻為M₃、長度為L₃，電阻線20自觸摸點C至第二端子22之間的電阻為M₄、長度為L₄，電阻線20自觸摸點B至觸摸點C之間的電阻為M₅、長度為L₅。電極層12與恒壓電源40相連接，故觸摸點B與觸摸點C電勢相同，電阻M₅被短路無電流通過，M₃與M₄並聯。 Please refer to FIG. 2, FIG. 3 and FIG. 6. FIG. 6 is an equivalent circuit diagram of the touch panel 10 when the touch panel 10 has two touch points. When the touch panel 10 is touched, the electrode layer 12 is in contact with the resistance line 20 of the resistance layer 14 at the touch point B and the touch point C. The resistance between the resistance line 20 from the touch point B to the first terminal 21 is M ₃ and the length is L ₃ , and the resistance between the resistance line 20 from the touch point C to the second terminal 22 is M ₄ and the length is L ₄ . The resistance between the resistance line 20 from the touch point B to the touch point C is M ₅ and the length is L ₅ . Electrode layer 1240 is connected to the constant voltage source, so that the same touch point touched point B and C potential, resistor M ₅ is no current through the short circuit, M ₃ and M ₄ in parallel.

設兩個觸摸點B、C的座標分別為(X₂，Y₂)、(X₃，Y₃)，因為觸摸點B與觸摸點C之間的電阻線20未接入電路，故M₃+M₄<M₀*L，L₃+L₄<L。控制器50利用第一電流感應器31測得電流值為I₁與第二電流感應器32測得電流值為I₂分別來計算觸摸點B和觸摸點C的座標，其具體計算方法如下：同理，首先分別計算觸摸點B至第一端子21之間的電阻為M₃以及觸摸點C至第二端子22之間的電阻為M₄，計算公式分別為M₃=U/I₁-R₁，M₄=U/I₂-R₂。計算從觸摸點B到第一端子21的電阻線20的長度L₃=M₃/M₀，將L₃除以(Y₀+T₀)得到整數K₂和餘數L₂₁，參考L₃=K₂(Y₀+T₀)+L₂₁，則可以得到觸摸點B的座標：當L₂₁≦Y₀，K₂為奇數時，觸摸點B的座標為(K₂T₀，Y₀-L₂₁)；當L₂₁≦Y₀，K₂為偶數時，觸摸點B的座標為(K₂T₀，L₂₁)；當L₂₁>Y₀，K₂為奇數時，觸摸點B的座標為[K₂T₀+(L₂₁-Y₀) ，0]；當L₂₁>Y₀，K₂為偶數時，觸摸點B的座標為[K₂T₀+(L₂₁-Y₀)，Y₀]。 Let the coordinates of the two touch points B and C be (X ₂ , Y ₂ ), (X ₃ , Y ₃ ), respectively, because the resistance line 20 between the touch point B and the touch point C is not connected to the circuit, so M ₃ +M ₄ <M ₀ *L, L ₃ +L ₄ <L. The controller 50 uses the first current sensor 31 to measure the current value I ₁ and the second current sensor 32 to measure the current value I ₂ to calculate the coordinates of the touch point B and the touch point C, respectively. The specific calculation method is as follows: Similarly, firstly, the resistance between the touch point B and the first terminal 21 is calculated as M ₃ and the resistance between the touch point C and the second terminal 22 is M ₄ , respectively, and the calculation formula is M ₃ =U/I ₁ - R ₁ , M ₄ = U/I _{2 -} R ₂ . Calculating the length L ₃ = M ₃ / M ₀ of the resistance line 20 from the touch point B to the first terminal 21, dividing L ₃ by (Y ₀ + T ₀ ) yields the integer K ₂ and the remainder L ₂₁ , with reference to L ₃ = K ₂ (Y ₀ +T ₀ )+L ₂₁ , then the coordinates of the touch point B can be obtained: when L ₂₁ ≦Y ₀ , K ₂ is an odd number, the coordinates of the touch point B are (K ₂ T ₀ , Y ₀ - L ₂₁ ); when L ₂₁ ≦Y ₀ , K ₂ is even, the coordinates of touch point B are (K ₂ T ₀ , L ₂₁ ); when L ₂₁ >Y ₀ , K ₂ is odd, touch point B The coordinates are [K ₂ T ₀ +(L ₂₁ -Y ₀ ) , 0]; when L ₂₁ >Y ₀ , K ₂ is even, the coordinate of touch point B is [K ₂ T ₀ +(L ₂₁ -Y ₀ ), Y ₀ ].

從觸摸點C到第二端子22的電阻線20的長度L₄=M₄/M₀，將L₄除以(Y₀+T₀)得到整數K₃和餘數L₃₁，參考公式L₄=K₃(Y₀+T₀)+L₃₁，則可以得到觸摸點C的座標：當L₃₁≦Y₀，K₃為奇數時，觸摸點C的座標為(K₃T₀，L₃₁)；當L₃₁≦Y₀，K₃為偶數時，觸摸點C的座標為(K₃T₀，Y₀-L₃₁)；當L₃₁>Y₀，K₃為奇數時，觸摸點C的座標為[K₃T₀+(L₃₁-Y₀)，Y₀]；當L₃₁>Y₀，K₃為偶數時，觸摸點C的座標為[K₃T₀+(L₃₁-Y₀)，0]。 From the touch point C to the length L ₄ of the resistance wire 20 of the second terminal 22 L ₄ = M ₄ / M ₀ , dividing L ₄ by (Y ₀ + T ₀ ) yields the integer K ₃ and the remainder L ₃₁ , with reference to the formula L ₄ = K ₃ (Y ₀ +T ₀ )+L ₃₁ , the coordinates of the touch point C can be obtained: when L ₃₁ ≦Y ₀ , K ₃ is an odd number, the coordinates of the touch point C are (K ₃ T ₀ , L ₃₁ ) When L ₃₁ ≦Y ₀ , K ₃ is even, the coordinates of touch point C are (K ₃ T ₀ , Y ₀ -L ₃₁ ); when L ₃₁ >Y ₀ , K ₃ is odd, touch point C The coordinates are [K ₃ T ₀ +(L ₃₁ -Y ₀ ), Y ₀ ]; when L ₃₁ >Y ₀ , K ₃ is even, the coordinate of touch point C is [K ₃ T ₀ +(L ₃₁ -Y ₀ ), 0].

請參考圖2，圖3和圖7，如果觸摸面板10上存在3個觸摸點，觸摸點D、觸摸點E、觸摸點F三個位置的電勢相同，電阻線20在觸摸點D與觸摸點E之間沒有電流通過，同理，電阻線20在觸摸點E與觸摸點F之間也沒有電流通過。即使在觸摸點D與觸摸點F之間存在複數觸摸點，在各個觸摸點的電勢相同，電阻線20在該些觸摸點之間亦不會有電流通過。因此根據第一電流感應器31測得電流值為I₁與第二電流感應器32測得電流值為I₂計算得到的是以電阻線20長度計算，距離第一端子21最近的觸摸點D以及距離第二端子22最近的觸摸點F的位置。 Referring to FIG. 2, FIG. 3 and FIG. 7, if there are three touch points on the touch panel 10, the potentials of the three positions of the touch point D, the touch point E, and the touch point F are the same, and the resistance line 20 is at the touch point D and the touch point. There is no current passing between E. Similarly, the resistance wire 20 does not pass current between the touch point E and the touch point F. Even if there are multiple touch points between the touch point D and the touch point F, the potentials at the respective touch points are the same, and the resistance wire 20 does not pass current between the touch points. Therefore, according to the measured current value I _{1 of the} first current sensor 31 and the current value I ₂ measured by the second current sensor 32, the touch point D calculated from the length of the resistance line 20 and closest to the first terminal 21 is calculated. And the position of the touch point F closest to the second terminal 22.

請參考圖8，圖8為實施例中觸摸輸入裝置100的工作流程圖。該工作流程包括以下步驟：步驟S101，第一電流感應器31與第二電流感應器32將所偵測到的電路電流值發送至控制器50。 Please refer to FIG. 8. FIG. 8 is a flowchart of the operation of the touch input device 100 in the embodiment. The workflow includes the following steps: Step S101, the first current sensor 31 and the second current sensor 32 send the detected circuit current value to the controller 50.

當觸摸面板10不存在任何觸摸點時，電路未導通，第一電流感應器31與第二電流感應器32偵測到的電流值為零。當觸摸面板10被觸摸時，電極層12與電阻層14相接觸，電阻層14接入電路，此時第一電流感應器31偵測到電流值I₁，第二電流感應器32偵測到電流值I₂，第一電流感應器31與第二電流感應器32將所偵測到的電路電流值I₁與I₂發送至控制器50。 When the touch panel 10 does not have any touch points, the circuit is not turned on, and the current values detected by the first current sensor 31 and the second current sensor 32 are zero. When the touch panel 10 is touched, the electrode layer 12 and resistor layer 14 in contact with, the access circuit resistance layer 14, while the first current sensor 31 detects a current value I _1, the second current sensor 32 detects The current value I ₂ , the first current sensor 31 and the second current sensor 32 send the detected circuit current values I ₁ and I ₂ to the controller 50 .

步驟S102，控制器50根據第一電流感應器31與第二電流感應器32所偵測到的電路電流值判斷觸摸面板10上被觸摸點的個數。 In step S102, the controller 50 determines the number of touched points on the touch panel 10 based on the circuit current values detected by the first current sensor 31 and the second current sensor 32.

控制器50根據第一電流感應器31偵測到電流值I₁，第二電流感應器32偵測到電流值I₂判斷觸摸面板10上被觸摸點的個數，當I₁=0，I₂=0時，觸摸面板10上不存在任何觸摸點。當I₁≠0，I₂≠0時，距離第一端子21最近的觸摸點與第一端子21之間的電阻為M_a=U/I₁-R₁，距離第二端子22最近的觸摸點與第二端子22之間的電阻為M_b=U/I₂-R₂，若M_a+M_b=M₀*L，則觸摸面板10上僅存在一個觸摸點；當M_a+M_b<M₀*L則觸摸面板10上存在一個以上的觸摸點。 The controller 50 detects the current value I ₁ according to the first current sensor 31, and the second current sensor 32 detects the current value I _{2 to} determine the number of touched points on the touch panel 10, when I ₁ =0, I _{When 2} =0, there is no touch point on the touch panel 10. When _{_{I 1 ≠ 0, I 2 ≠}} 0 , the distance 21 between the resistor 21 nearest the first terminal and the first terminal of the touch point to _{_{M a = U / I 1 -R}} 1, from 22 nearest the second terminal of the touch The resistance between the point and the second terminal 22 is M _b =U/I ₂ -R ₂ , and if M _a +M _b =M ₀ *L, there is only one touch point on the touch panel 10; when M _a +M _b <M ₀ *L There are more than one touch points on the touch panel 10.

步驟S103，控制器50根據第一電流感應器31與第二電流感應器32所偵測到的電路電流值確定觸摸面板10上被觸摸點的位置。 In step S103, the controller 50 determines the position of the touched point on the touch panel 10 based on the circuit current value detected by the first current sensor 31 and the second current sensor 32.

若觸摸面板10上僅存在一個觸摸點，控制器50根據電流值I₁計算出觸摸點的位置(也可使用電流值I₂)；若觸摸面板10上存在一個以上的觸摸點，控制器50根據電流值I₁與I₂分別計算出距離第一端子21和第二端子22最近的兩個觸摸點的位置。 If there is only one touch point on the touch panel 10, the controller 50 calculates the position of the touch point according to the current value I ₁ (the current value I ₂ can also be used); if there is more than one touch point on the touch panel 10, the controller 50 The positions of the two touch points closest to the first terminal 21 and the second terminal 22 are respectively calculated from the current values I ₁ and I ₂ .

因為電流值I₁對應了距離第一端子21最近的觸摸點的位置，電流值I₂對應了距離第二端子22最近的觸摸點的位置，所以在本發明其他實施方式中，可以事先建立電流值I₁、I₂與觸摸點座標之間的對應關係表，並在控制器50中增加一記憶體存儲該對應關係表。控制器50接收到第一電流感應器31與第二電流感應器32所偵測到的電路電流值I₁與I₂，然後在對應關係表查詢到對應的座標，即可確定觸摸點的位置。 Since the current value I ₁ corresponds to the position of the touch point closest to the first terminal 21, the current value I ₂ corresponds to the position of the touch point closest to the second terminal 22, so in other embodiments of the present invention, the current can be established in advance. A correspondence table between the values I ₁ and I ₂ and the touch point coordinates, and a memory is added to the controller 50 to store the correspondence table. The controller 50 receives the circuit current values I ₁ and I ₂ detected by the first current sensor 31 and the second current sensor 32, and then queries the corresponding coordinates in the correspondence table to determine the position of the touch point. .

電阻線20在電阻層14上也可以其他有規則的方式排布，通過建立適當的坐標系可以計算出觸摸點的座標。 The resistive wires 20 can also be arranged on the resistive layer 14 in other regular ways, and the coordinates of the touch points can be calculated by establishing an appropriate coordinate system.

本技術領域的普通技術人員應當認識到，以上的實施方式僅是用來說明本發明，而並非用作為對本發明的限定，只要在本發明的實質精神範圍之內，對以上實施例所作的適當改變和變化都落在本發明要求保護的範圍之內。 It is to be understood by those skilled in the art that the above embodiments are only intended to illustrate the invention, and are not intended to limit the invention, as long as it is within the spirit of the invention Changes and modifications are intended to fall within the scope of the invention.

12‧‧‧電極層 12‧‧‧electrode layer

14‧‧‧電阻層 14‧‧‧resistance layer

20‧‧‧電阻線 20‧‧‧resistance line

21‧‧‧第一端子 21‧‧‧First terminal

22‧‧‧第二端子 22‧‧‧second terminal

Claims

一種觸摸輸入裝置，包括觸摸面板和控制電路，其改良在於，該控制電路包括：第一電流感應器、第二電流感應器、恒壓電源以及控制器；該觸摸面板包括：覆蓋層；基板；電極層，貼附於覆蓋層內表面，該電極層與恒壓電源相連接；電阻層，貼附於基板上方，該電阻層上設有佈滿整個工作面的電阻線，電阻線的第一端子與第一電流感應器相連接，第二端子與第二電流感應器相連接；電極層與電阻層之間通過絕緣間隔物分隔開來；當用戶觸摸該觸摸面板時，覆蓋層發生彈性形變，電極層與電阻層在接觸點相接觸，電阻線與電極層連成回路，所述控制器根據第一電流感應器與第二電流感應器測量得到的電流值確定觸摸點的個數和位置。 A touch input device includes a touch panel and a control circuit, wherein the control circuit comprises: a first current sensor, a second current sensor, a constant voltage power source, and a controller; the touch panel includes: a cover layer; a substrate; The electrode layer is attached to the inner surface of the cover layer, and the electrode layer is connected to the constant voltage power source; the resistance layer is attached to the upper surface of the substrate, and the resistance layer is provided with a resistance wire covering the entire working surface, and the resistance wire is first The terminal is connected to the first current inductor, the second terminal is connected to the second current inductor; the electrode layer and the resistance layer are separated by an insulating spacer; when the user touches the touch panel, the cover layer is elastic Deformation, the electrode layer and the resistance layer are in contact at a contact point, the resistance wire is connected with the electrode layer, and the controller determines the number of touch points according to the current value measured by the first current sensor and the second current sensor. position.

如申請專利範圍第1項所述之觸摸輸入裝置，其中，所述絕緣間隔物由柔性的絕緣材料組成的柵格陣列構成。 The touch input device of claim 1, wherein the insulating spacer is composed of a grid array of flexible insulating materials.

如申請專利範圍第1項所述之觸摸輸入裝置，其中，所述電阻線的第一端子和第二端子分別設置於電阻層的兩個對角處，在電阻層上反復彎折，形成一弓形結構。 The touch input device of claim 1, wherein the first terminal and the second terminal of the resistance wire are respectively disposed at two opposite corners of the resistance layer, and are repeatedly bent on the resistance layer to form a Bow structure.

如申請專利範圍第1項所述之觸摸輸入裝置，其中，在電阻線的第一端子與第一電流感應器之間以及第二端子與第二電流感應器之間還設有分壓電阻。 The touch input device of claim 1, wherein a voltage dividing resistor is further disposed between the first terminal of the resistance wire and the first current sensor and between the second terminal and the second current sensor.

如申請專利範圍第4項所述之觸摸輸入裝置，其中，控制器根據第一電流感應器與第二電流感應器根據所偵測到的電路電流值確定觸摸面板上被觸摸點的個數，具體判斷方法為：恒壓電源輸出電壓為U，電阻線的單位長度電阻是M₀歐姆/米，長度為L，第一端子與第一電流感應器之間的分壓電阻電阻值為R₁，第二端子與第二電流感應器之間的分壓電阻電阻值為R₂，第一電流感應器偵測到的電流值為I₁，第二電流感應器測得電流值為I₂；當I₁=0，I₂=0時，觸摸面板上不存在觸摸點；當(U/I₁-R₁)+(U/I₂-R₂)=M₀*L時，觸摸面板上存在一個觸摸點；當(U/I₁-R₁)+(U/I₂-R₂)<M₀*L時，觸摸面板上存在至少兩個觸摸點。 The touch input device of claim 4, wherein the controller determines the number of touched points on the touch panel according to the detected circuit current value according to the first current sensor and the second current sensor. The specific judgment method is: the output voltage of the constant voltage power supply is U, the resistance of the resistance line is M ₀ ohm/meter, the length is L, and the voltage dividing resistance between the first terminal and the first current sensor is R _{1 .} The voltage dividing resistance between the second terminal and the second current sensor is R ₂ , the current value detected by the first current sensor is I ₁ , and the current value measured by the second current sensor is I ₂ ; When I ₁ =0, I ₂ =0, there is no touch point on the touch panel; when (U/I ₁ -R ₁ )+(U/I ₂ -R ₂ )=M ₀ *L, on the touch panel There is one touch point; when (U/I ₁ -R ₁ )+(U/I ₂ -R ₂ )<M ₀ *L, there are at least two touch points on the touch panel.

如申請專利範圍第5項所述之觸摸輸入裝置，其中，所述控制器還包括一記憶體，該記憶體中存儲有第一電流感應器與第二電流感應器測量得到的電流值與觸摸點座標之間的對應關係表，所述控制器根據第一電流感應器與第二電流感應器測量得到的電流值從該對應關係表中查詢到觸摸點座標，確定觸摸點位置。 The touch input device of claim 5, wherein the controller further comprises a memory, wherein the memory stores the current value and the touch measured by the first current sensor and the second current sensor. A correspondence table between the points coordinates, the controller queries the touch point coordinates from the correspondence table according to the current values measured by the first current sensor and the second current sensor to determine the touch point position.

一種觸摸面板，包括：覆蓋層；基板；電極層，貼附於覆蓋層內表面；電阻層，貼附於基板上方，該電阻層上設有佈滿整個工作面的電阻線；電極層與電阻層之間通過複數絕緣間隔物分隔開；在電極層與電阻層之間形成一電勢差，當用戶觸摸該觸摸面板時，覆蓋層發生彈性形變，電極層與電阻層在接觸點相接觸，電阻線與電極層連成回路，電阻線上的電流發生變化。 A touch panel comprising: a cover layer; a substrate; an electrode layer attached to the inner surface of the cover layer; a resistive layer attached to the upper surface of the substrate; the resistive layer is provided with a resistance wire covering the entire working surface; and the plurality of insulating spacers are separated between the electrode layer and the resistance layer Separating; forming a potential difference between the electrode layer and the resistance layer, when the user touches the touch panel, the cover layer is elastically deformed, the electrode layer and the resistance layer are in contact at the contact point, and the resistance wire and the electrode layer are connected in a loop, and the resistance The current on the line changes.

如申請專利範圍第7項所述之觸摸面板，其中，所述絕緣間隔物由柔性的絕緣材料組成的柵格陣列構成。 The touch panel of claim 7, wherein the insulating spacer is composed of a grid array of flexible insulating materials.

如申請專利範圍第7項所述之觸摸面板，其中，電阻線的第一端子和第二端子分別設置於電阻層邊沿的兩個對角處，在電阻層上反復彎折，形成一弓形結構。 The touch panel of claim 7, wherein the first terminal and the second terminal of the resistance wire are respectively disposed at two opposite corners of the edge of the resistance layer, and are repeatedly bent on the resistance layer to form an arcuate structure. .