TWM484751U - Capacitive touch panel - Google Patents
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本新型大體上與一種觸控板有關，更特定言之，其係關於一種具有主分支電極以及次分支電極的觸控電極圖形結構。The present invention relates generally to a touchpad, and more particularly to a touch electrode pattern structure having a primary branch electrode and a secondary branch electrode.
觸控電極能夠偵測到主動區域或顯示區域內的觸控動作，如偵測是否有使用者用手指按壓觸控螢幕上的固定影像，或是偵測手指在觸控螢幕上的位置。某些觸控面板能夠偵測手指以外的物件，如觸控筆。在顯示螢幕上使用觸控板能夠改變電子裝置的顯示模式，如呈現可供使用者經由觸摸來選取、操作、或作動的圖像或按鈕。故此，觸控螢幕能夠提供手機、全球導航系統、個人行動助理、自動提款機等電子裝置有效的使用者介面。The touch electrode can detect the touch action in the active area or the display area, such as detecting whether a user presses a fixed image on the touch screen with a finger or detects the position of the finger on the touch screen. Some touch panels can detect objects other than your finger, such as a stylus. Using the touchpad on the display screen can change the display mode of the electronic device, such as presenting an image or button that can be selected, manipulated, or actuated by the user via touch. Therefore, the touch screen can provide an effective user interface for electronic devices such as mobile phones, global navigation systems, personal mobile assistants, and cash dispensers.
一般觸控板使用多種技術來感測手指或觸控筆，諸如電阻式、電容式、紅外線式、或是表面聲波式。其中，電容式觸控板是現今的主流產品，其結構一般為使用透明導電材質，如氧化銦錫(ITO)，在絕緣基板上形成特定的感應電極圖形，如X電極與Y軸電極排列成陣列型態並彼此間達到電容耦合。當物件觸碰或靠近觸控螢幕時，觸控螢幕特定位置上原本的電容會有所改變，此電容的變化值將會傳送到控制器來進行觸控的判別，進而決定出觸控位置。A typical touchpad uses a variety of techniques to sense a finger or stylus, such as resistive, capacitive, infrared, or surface acoustic waves. Among them, the capacitive touch panel is a mainstream product today, and its structure is generally formed by using a transparent conductive material such as indium tin oxide (ITO) to form a specific sensing electrode pattern on the insulating substrate, such as an X electrode and a Y-axis electrode. Array patterns and capacitive coupling to each other. When an object touches or approaches the touch screen, the original capacitance at a specific position of the touch screen will change, and the change value of the capacitance will be transmitted to the controller to determine the touch, thereby determining the touch position.
在電容式觸控技術中，其中又以互容式(mutual capacitance)的感應更能感測多點觸控的行為，被廣泛應用在多種觸控產品上。然現今的觸控產品上被動觸控筆寫與手套感應的應用需求增加時，電容式觸控技術仍有需多習知問題有待解決。首先，對於互容式電極結構來說，其訊噪比(SNR)係正比 於發射電極(Tx)的驅動電壓，故如果要提高訊噪比就必須提高發射電極的驅動電壓(10V以上)，其需要較高成本的IC製程來實現。其次，現今大多的互容式觸控技術多採用縮小電極的節距(約縮小到4釐米以下)來增加感測的解析度並達到較佳的線性度，然而這樣的作法不僅會需要增設更多的感應電極，也會增加感測的反應時間。再者，在面板上離感應電極越遠的觸控位置，其所能產生的電容訊號越弱，使得定位能力更差，應用於超薄面板設計中會使此缺點更為明顯。Among the capacitive touch technologies, the mutual capacitance sensing is more sensitive to multi-touch behavior, and is widely used in various touch products. However, when the demand for passive stylus writing and glove sensing is increasing in today's touch products, capacitive touch technology still needs more problems to be solved. First, for a mutual-capacitance electrode structure, its signal-to-noise ratio (SNR) is proportional Because of the driving voltage of the emitter electrode (Tx), if the signal-to-noise ratio is to be increased, the driving voltage of the emitter electrode (10 V or more) must be increased, which requires a higher cost IC process. Secondly, most of today's mutual-capacitive touch technologies use the pitch of the reduced electrode (about 4 cm or less) to increase the resolution of the sensing and achieve better linearity. However, this method will not only need to be added. A large number of sensing electrodes also increase the response time of the sensing. Moreover, the farther the touch position on the panel from the sensing electrode is, the weaker the capacitive signal can be generated, which makes the positioning ability worse. This shortcoming is more obvious in the ultra-thin panel design.
有鑑於上述習知互容式觸控技術的諸多缺失，本新型的目的即在於提出一種低成本且高效率的互容式觸控電極圖形設計，其透過減少電極之間互容值且增設分支電極的方式有效地解決前述諸多的習知問題，達到較佳的感測靈敏度，並得以節省觸控模組製作成本。In view of the many shortcomings of the above-mentioned mutual-capacitive touch technology, the object of the present invention is to propose a low-cost and high-efficiency mutual-capacitive touch electrode graphic design, which reduces the mutual capacitance value between electrodes and adds branches. The electrode method effectively solves many of the above-mentioned conventional problems, achieves better sensing sensitivity, and saves the manufacturing cost of the touch module.
本新型的特殊電極設計可在不提高驅動電壓及不縮小電極節距的情況下，例如發射電極的驅動電壓保持在10V以下，電極節距保持約4~7釐米，仍可維持線性度且可使用於觸控筆運用上。The special electrode design of the novel can maintain the driving voltage and reduce the electrode pitch, for example, the driving voltage of the transmitting electrode is kept below 10V, the electrode pitch is maintained at about 4-7 cm, and the linearity can be maintained. Used in stylus applications.
根據本新型一態樣，其提出了一種電容式觸控板，包含一具有上表面與下表面的基板、複數條第一電極間隔設置在上表面上且沿著一第一方向延伸、以及複數條第二電極間隔設置在下表面上且沿著一第二方向延伸，其中第一電極具有至少一條第一主分支電極沿著第二方向延伸，第二電極具有至少一條第二主分支電極沿著第一方向延伸以及至少一條第二次分支電極沿著第一方向延伸。According to an aspect of the present invention, a capacitive touch panel includes a substrate having an upper surface and a lower surface, a plurality of first electrodes spaced apart on the upper surface and extending along a first direction, and a plurality of a second electrode spacing is disposed on the lower surface and extending along a second direction, wherein the first electrode has at least one first main branch electrode extending along the second direction, and the second electrode has at least one second main branch electrode along The first direction extends and the at least one second secondary branch electrode extends along the first direction.
無疑地，本新型的這類目的與其他目的在閱者讀過下文以多種圖示與繪圖來描述的較佳實施例細節說明後將變得更為顯見。These and other objects of the present invention will become more apparent from the following detailed description of the preferred embodiments.
100‧‧‧第一電極100‧‧‧first electrode
102‧‧‧電極部102‧‧‧Electrode
104‧‧‧橋接部104‧‧‧Bridge
106‧‧‧第一主分支電極106‧‧‧First main branch electrode
110‧‧‧第二電極110‧‧‧second electrode
112‧‧‧電極部112‧‧‧Electrode
114‧‧‧橋接部114‧‧‧Bridge
116‧‧‧第二主分支電極116‧‧‧Second main branch electrode
118‧‧‧第二次分支電極118‧‧‧Second branch electrode
120‧‧‧虛置導體塊120‧‧‧Virtual conductor block
130‧‧‧基板130‧‧‧Substrate
140‧‧‧保護玻璃140‧‧‧protective glass
150‧‧‧液晶模組150‧‧‧LCD Module
160‧‧‧觸控筆160‧‧‧ stylus
P1,P2‧‧‧節距P1, P2‧‧ ‧ pitch
第1圖為根據本新型較佳實施例的第一電極(接收電極)的上視圖；第2圖為根據本新型較佳實施例的第二電極(發射電極)的上視圖；第3圖為第1圖所示的第一電極與第2圖所示的第二電極疊合後的放大上視圖；以及第4圖為根據本新型較佳實施例的電容式觸控板的截面示意圖，其繪示出第一電極與第二電極之間的相對位置與電容耦合關係。1 is a top view of a first electrode (receiving electrode) according to a preferred embodiment of the present invention; FIG. 2 is a top view of a second electrode (emitter electrode) according to a preferred embodiment of the present invention; An enlarged top view of the first electrode shown in FIG. 1 overlapping with the second electrode shown in FIG. 2; and FIG. 4 is a schematic cross-sectional view of the capacitive touch panel according to the preferred embodiment of the present invention. The relative position and capacitive coupling relationship between the first electrode and the second electrode is illustrated.
在下文的細節描述中，元件符號會標示在隨附的圖示中成為其中的一部份，並且以可實行該實施例之特例描述方式來表示。這類實施例會說明足夠的細節俾使該領域之一般技藝人士得以具以實施。閱者須瞭解到本新型中亦可利用其他的實施例或是在不悖離所述實施例的前提下作出結構性、邏輯性、及電性上的改變。因此，下文之細節描述將不欲被視為是一種限定，反之，其中所包含的實施例將由隨附的申請專利範圍來加以界定。In the detailed description that follows, the component symbols are marked as part of the accompanying drawings and are described in the manner in which the particular embodiments of the embodiments can be practiced. Such embodiments will be described in sufficient detail to enable those of ordinary skill in the art to practice. The reader is aware that other embodiments may be utilized and structural, logical, and electrical changes may be made without departing from the embodiments. Therefore, the following detailed description is not to be considered as a limitation, and the embodiments included herein are defined by the scope of the accompanying claims.
首先請參照第1圖，其繪示出根據本新型較佳實施例複數條第一電極圖形的上視圖。本新型的第一電極可為互容式感應電極結構中的接收電極(Receiver,Rx)，其可與對應的發射電極產生電容耦合並構成投射電場，此感應機制將於後續實施例中詳述。如第1圖所示，第一電極100係呈等間距平行設置，且沿著一第一方向延伸，如X軸方向。第一電極100係由多個電極部102與多個橋接部104交替連接而成，其中電極部102的寬度係大於橋接部104的寬度。在此較佳實施例中，電極部102係設計成狹長矩形，其與橋接部104連接的一端呈漸縮態樣，兩者使用單一材質形成，如使用ITO材料以微影蝕刻或黃光製程一體成形在基板上。在尺度方面，舉例言之，第一電極100之間的節距P1介於4~7釐米之間，為較大電極節距之設計。橋接部104的寬度約為300微米(μm)，橋接部104的長度可設定成其寬度的三至四倍，如1釐米。電極部102的寬度約為節距P1的六分之一至七分之一，如1 釐米，長度則為節距P1的七分之五，如4釐米。須注意以上的尺度規格皆為例示之用，但並不以此為限。Referring first to Figure 1, a top view of a plurality of first electrode patterns in accordance with a preferred embodiment of the present invention is illustrated. The first electrode of the present invention may be a receiving electrode (Receiver, Rx) in a mutual capacitive sensing electrode structure, which can capacitively couple with a corresponding transmitting electrode and constitute a projected electric field. The sensing mechanism will be detailed in the following embodiments. . As shown in FIG. 1, the first electrodes 100 are arranged in parallel at equal intervals and extend along a first direction, such as the X-axis direction. The first electrode 100 is formed by alternately connecting a plurality of electrode portions 102 and a plurality of bridge portions 104, wherein the width of the electrode portion 102 is greater than the width of the bridge portion 104. In the preferred embodiment, the electrode portion 102 is designed as an elongated rectangle, and the end connected to the bridge portion 104 is tapered. The two are formed using a single material, such as a lithography or yellow light process using an ITO material. It is integrally formed on the substrate. In terms of scale, for example, the pitch P1 between the first electrodes 100 is between 4 and 7 cm, which is a design of a larger electrode pitch. The width of the bridge portion 104 is about 300 micrometers (μm), and the length of the bridge portion 104 can be set to three to four times its width, such as 1 cm. The width of the electrode portion 102 is about one sixth to one seventh of the pitch P1, such as 1 In centimeters, the length is five-fifths of the pitch P1, such as 4 cm. It should be noted that the above scale specifications are for illustrative purposes, but are not limited thereto.
復參照第1圖，本新型的特徵要點在於，電極部102的兩側有第一主分支電極106延伸而出。在本新型較佳實施例中，第一主分支電極106係設置在電極部102兩側的中點上，其沿著一第二方向延伸而出，如Y軸方向，其中第一方向與第二方向較佳呈90度角。如圖所示，兩相鄰的第一主分支電極106彼此相對但不互相接觸。在尺度方面，舉例言之，第一主分支電極106的長度可為第一電極100的節距P1的三分之一，如2釐米。第一主分支電極106的寬度可為介於300~400微米之間。兩相鄰的第一主分支電極106之間的間距d約為1釐米。須注意以上的尺度規格皆為例示之用，但並不以此為限，且本新型中第一主分支電極106的數量並不限定為只有一條。Referring to Fig. 1, the main feature of the present invention is that the first main branch electrode 106 extends from both sides of the electrode portion 102. In the preferred embodiment of the present invention, the first main branch electrodes 106 are disposed at the midpoints of the two sides of the electrode portion 102, and extend along a second direction, such as the Y-axis direction, wherein the first direction and the first The two directions are preferably at an angle of 90 degrees. As shown, the two adjacent first main branch electrodes 106 are opposite each other but not in contact with each other. In terms of scale, for example, the length of the first main branch electrode 106 may be one third of the pitch P1 of the first electrode 100, such as 2 cm. The width of the first main branch electrode 106 may be between 300 and 400 microns. The spacing d between the two adjacent first main branch electrodes 106 is about 1 cm. It should be noted that the above-mentioned scale specifications are exemplary, but are not limited thereto, and the number of the first main branch electrodes 106 in the present invention is not limited to one.
接著請參照第2圖，其繪示出根據本新型較佳實施例複數條第二電極圖形的上視圖。本新型的第二電極可為互容式電極結構中的發射電極(Transmitter,Tx)其可與對應的接收電極(Rx)產生電容耦合並構成投射電場。如第2圖所示，第二電極110係呈等間距平行設置，且沿著一第二方向延伸，如Y軸方向。同第一電極100，第二電極110係由多個電極部112與多個橋接部114交替連接而成，其中電極部112的寬度係大於橋接部114的寬度。在此較佳實施例中，電極部112係呈狹長矩形，其與橋接部114連接的一端呈漸縮態樣，兩者使用單一材質形成，如使用ITO材料以微影蝕刻或黃光製程一體成形在基板上。在尺度方面，舉例言之，第二電極110之間的節距P2介於4~7釐米之間，橋接部114的寬度約為300微米(μm)，長度可設定成其寬度的三至四倍，如1釐米。電極部112的寬度約為節距P2的六分之一至七分之一，如1釐米，長度則為節距P2的七分之五，約4釐米。須注意以上的尺度規格皆為例示之用，但並不以此為限。Referring next to FIG. 2, a top view of a plurality of second electrode patterns in accordance with a preferred embodiment of the present invention is illustrated. The second electrode of the present invention may be a transmitting electrode (Transmitter, Tx) in a mutual capacitive electrode structure that can capacitively couple with a corresponding receiving electrode (Rx) and constitute a projected electric field. As shown in FIG. 2, the second electrodes 110 are arranged in parallel at equal intervals and extend in a second direction, such as the Y-axis direction. Like the first electrode 100, the second electrode 110 is formed by alternately connecting a plurality of electrode portions 112 and a plurality of bridge portions 114, wherein the width of the electrode portion 112 is greater than the width of the bridge portion 114. In the preferred embodiment, the electrode portion 112 has a long rectangular shape, and the end connected to the bridge portion 114 is tapered. The two are formed of a single material, such as lithography or lithography. Formed on the substrate. In terms of scale, for example, the pitch P2 between the second electrodes 110 is between 4 and 7 cm, the width of the bridge portion 114 is about 300 micrometers (μm), and the length can be set to three to four of its width. Times, such as 1 cm. The width of the electrode portion 112 is about one-sixth to one-seventh of the pitch P2, such as 1 cm, and the length is five-fifths of the pitch P2, about 4 cm. It should be noted that the above scale specifications are for illustrative purposes, but are not limited thereto.
復參照第2圖，電極部112的兩側有第二主分支電極116延伸而出。在本新型較佳實施例中，第二主分支電極116係設置在電極部112兩側 的中點上，其沿著一第一方向延伸而出，如X軸方向，其中第一方向與第二方向較佳呈90度角。如圖所示，兩相鄰的第二主分支電極116彼此相對但不互相接觸。在本新型中，第一電極100與第二電極110的差別處在於，如第2圖所示，第二電極110的電極部112兩側另外具有第二次分支電極118。在本新型較佳實施例中，第二次分支電極118分設在第二主分支電極116兩側且相隔一樣的間隔。此外，在其他實施例中，第一電極100亦可形成有如第二電極110般的次分支電極，端視實際需求與設計而定。Referring to Fig. 2, the second main branch electrode 116 extends from both sides of the electrode portion 112. In the preferred embodiment of the present invention, the second main branch electrode 116 is disposed on both sides of the electrode portion 112. At a midpoint, it extends along a first direction, such as the X-axis direction, wherein the first direction is preferably at an angle of 90 degrees to the second direction. As shown, the two adjacent second main branch electrodes 116 are opposed to each other but not in contact with each other. In the present invention, the difference between the first electrode 100 and the second electrode 110 is that, as shown in FIG. 2, the electrode portion 112 of the second electrode 110 additionally has a second branch electrode 118 on both sides. In the preferred embodiment of the present invention, the second branch electrodes 118 are disposed on both sides of the second main branch electrode 116 and spaced apart by the same interval. In addition, in other embodiments, the first electrode 100 may also be formed with a secondary branch electrode like the second electrode 110, depending on actual needs and design.
在尺度方面，舉例言之，第二主分支電極116的長度可為第二電極110的節距P2的三分之一，如2釐米。第一電極100的節距P1與第二電極的節距P2可設定為相同。第二次分支電極118的長度則小於第二主分支電極116的長度。第二主分支電極116與第二次分支電極118的寬度可相同，如介於300~400微米之間，兩相鄰的第二主分支電極116之間的間距d約為0.4釐米。須注意以上的尺度規格皆為例示之用，但並不以此為限，且第二主分支電極116的數量並不限定為只有一條，而其兩側的第二次分支電極118的數量也不限定為分別只有一條，其可能在兩側呈多條多種長度之次分支設計。In terms of scale, for example, the length of the second main branch electrode 116 may be one third of the pitch P2 of the second electrode 110, such as 2 cm. The pitch P1 of the first electrode 100 and the pitch P2 of the second electrode may be set to be the same. The length of the second branch electrode 118 is then smaller than the length of the second main branch electrode 116. The width of the second main branch electrode 116 and the second sub-fraction electrode 118 may be the same, such as between 300 and 400 microns, and the spacing d between the two adjacent second main branch electrodes 116 is about 0.4 cm. It should be noted that the above-mentioned scale specifications are for illustrative purposes, but are not limited thereto, and the number of the second main branch electrodes 116 is not limited to only one, and the number of the second branch electrodes 118 on both sides thereof is also limited. It is not limited to only one, and it may be designed with multiple branches of multiple lengths on both sides.
接著請參照第3圖，其繪示出第1圖所示的第一電極100與第2圖所示的第二電極110疊合後的放大上視圖。如第3圖所示，疊合後的多條第一電極100與多條第二電極110係共同構成了一電極陣列，兩者較佳在其橋接部104/114部位交錯，進而界定出多個方形感應區域單元，且該第一電極100及第二電極110可位於同一基板上下兩側，或是位於一基板之同一側，亦或是分別設置於不同基板上。第一主分支電極106、第二主分支電極116、以及第二次分支電極118係延伸進入感應區域單元之中。復如第3圖所示，在較佳實施例中，設置在電極部側邊中點的第一主分支電極106與第二主分支電極116會從四個方向延伸接近感應區域單元的中點，且相鄰第一主分支電極106間距係為相鄰第二主分支電極116間距的2.5倍，而第二次分支電 極118則會與第二主分支電極116以及第一電極100等間隔設置。須注意對應不同的電極節距以及X軸/Y軸夾角，感應區域單元亦可能是其他形狀，如長方形或平行四邊形等，且主分支電極與次分支電極可能為非直線態樣，如弧形、波浪形、鋸齒形等。Next, referring to FIG. 3, an enlarged top view in which the first electrode 100 shown in FIG. 1 is overlapped with the second electrode 110 shown in FIG. 2 is shown. As shown in FIG. 3, the stacked plurality of first electrodes 100 and the plurality of second electrodes 110 together form an electrode array, and the two are preferably staggered at the bridging portions 104/114, thereby defining more The square sensing area unit, and the first electrode 100 and the second electrode 110 may be located on the upper and lower sides of the same substrate, or on the same side of a substrate, or respectively disposed on different substrates. The first main branch electrode 106, the second main branch electrode 116, and the second sub-branch electrode 118 extend into the sensing area unit. As shown in FIG. 3, in the preferred embodiment, the first main branch electrode 106 and the second main branch electrode 116 disposed at the midpoint of the side of the electrode portion extend from the four directions to the midpoint of the sensing area unit. And the spacing of the adjacent first main branch electrodes 106 is 2.5 times the pitch of the adjacent second main branch electrodes 116, and the second branch electric The pole 118 is disposed at equal intervals from the second main branch electrode 116 and the first electrode 100. It should be noted that corresponding to different electrode pitch and X-axis/Y-axis angle, the sensing area unit may also be other shapes, such as rectangular or parallelogram, and the main branch electrode and the secondary branch electrode may be non-linear, such as curved. , wavy, zigzag, etc.
從第3圖可以清楚看出，本新型的主分支電極與次分支電極設計可以有效覆蓋感應區域單元內的空乏區域，而剩餘的空乏區域則可另外設置多個虛置導體塊120來加以填補。虛置導體塊120的材質可與電極相同，而係可增加電極與IC電路之間的電磁屏蔽效果，並可增加平面上的單位圖形均勻度，但其並未加以通電，故不會對電容值造成負面影響。另需注意到，該些虛置導體塊120不會和第一電極100及第二電極110直接接觸，第3圖為第一電極、第二電極分別設於基板上下兩側且處置導體塊位於基板下側的實施情況；應當理解的是，第一電極100及第二電極110可同時設在基板同一側，並在橋接部114交錯處以非導電性材質隔開。As can be clearly seen from FIG. 3, the main branch electrode and the sub-branch electrode of the present invention can effectively cover the depletion region in the sensing area unit, and the remaining depletion region can be additionally provided with a plurality of dummy conductor blocks 120 to fill. . The dummy conductor block 120 can be made of the same material as the electrode, and can increase the electromagnetic shielding effect between the electrode and the IC circuit, and can increase the uniformity of the unit pattern on the plane, but it is not energized, so the capacitor is not The value has a negative impact. It should be noted that the dummy conductor blocks 120 are not in direct contact with the first electrode 100 and the second electrode 110. In FIG. 3, the first electrode and the second electrode are respectively disposed on the upper and lower sides of the substrate, and the disposal conductor block is located. The implementation of the underside of the substrate; it should be understood that the first electrode 100 and the second electrode 110 can be simultaneously disposed on the same side of the substrate, and separated by a non-conductive material at the intersection of the bridge portions 114.
在說明完上述本新型的電極圖形設計之後，接下來將以截面圖來說明所述電極在基板上的相對位置以及其電容耦合關係。現在請參照第4圖，其繪示出根據本新型較佳實施例電容式觸控板的截面示意圖(圖中僅繪出第一電極100及第二電極110分設於基板上下兩側的實施情況)。如第4圖所示，本新型的第一電極100與第二電極110係分別設置在一透明基板130的上下表面。透明基板130的材質可為PET、PC、PMMA、PEN、PES、PVA、PI、PS、玻璃等。一保護玻璃140，如強化玻璃，設置在第二電極(Rx)110電極上以提供保護效果，操作時保護玻璃140係為進行觸控或近接之一端。內含驅動電路的液晶模組150則設置在另一側的第一電極100下方，其中的驅動IC(未圖示)會與第二電極(Tx)110電連結並提供一驅動電壓訊號。在接受驅動電壓後，第一電極100與第二電極110之間會產生投射式電場(如圖中虛線所示)，達成兩電極間的電容耦合。如此，當一觸控筆160接近或接觸保護蓋板140時，其會改變兩電極間的既有電場，並吸收部分電容使得感應 電容值發生改變，其中的作用機制可以下述公式來說明：△C P =(C P -C f )/C P ...(一)After the description of the electrode pattern design of the present invention described above, the relative position of the electrodes on the substrate and its capacitive coupling relationship will be described in a cross-sectional view. Referring now to FIG. 4, a cross-sectional view of a capacitive touch panel according to a preferred embodiment of the present invention is illustrated (only the first electrode 100 and the second electrode 110 are disposed on the upper and lower sides of the substrate). Happening). As shown in FIG. 4, the first electrode 100 and the second electrode 110 of the present invention are respectively disposed on the upper and lower surfaces of a transparent substrate 130. The material of the transparent substrate 130 may be PET, PC, PMMA, PEN, PES, PVA, PI, PS, glass, or the like. A protective glass 140, such as tempered glass, is disposed on the second electrode (Rx) 110 electrode to provide a protective effect. The protective glass 140 is operated to be one of the touch or the proximity. The liquid crystal module 150 including the driving circuit is disposed under the first electrode 100 on the other side, and a driving IC (not shown) is electrically connected to the second electrode (Tx) 110 and provides a driving voltage signal. After receiving the driving voltage, a projected electric field is generated between the first electrode 100 and the second electrode 110 (shown by a broken line in the figure) to achieve capacitive coupling between the two electrodes. Thus, when a stylus 160 approaches or contacts the protective cover 140, it changes the existing electric field between the two electrodes and absorbs part of the capacitance so that the value of the induced capacitance changes. The mechanism of action can be explained by the following formula: △ C P =( C P - C f )/ C P ... (1)
其中，C P 為驅動節點的互感感應電容；C f 為手指感應的對地電容；而△C P 為原有感應電容的電容變化比值。Wherein, C P is a mutual inductance sensing capacitance of the driving node; C f is a capacitance of the ground induced by the finger; and ΔC P is a capacitance change ratio of the original sensing capacitance.
由上述式(一)可知，驅動節點的感應電容C P 值越大，觸控感應時的電容變化比值△C P 就越接近1，代表其觸控行為發生時的電容變化量越小，對於感測相對不易。It can be seen from the above formula (1) that the larger the capacitance C P value of the driving node is, the closer the capacitance change ratio ΔC P is to 1 when the touch sensing is performed, which means that the capacitance change amount when the touch behavior occurs is smaller, Sensing is relatively difficult.
本新型將第一電極100與第二電極110設計呈狹長形狀，即實質上縮小電極的線寬，如此使得電極間彼此的距離增大，而縮小變窄的橋接部設計可使兩電極的重合面積更為縮小，以上種種設計都能使驅動節點的感應電容C P 值變小。如此，觸控行為發生時電容變化比值△C P 變化量相對變大，有助於觸控之感應，增加感應的靈敏度。感測靈敏度的增加亦使得本新型有條件應用在未來對電容變化比值條件更嚴苛的雙層超薄薄膜基材的觸控面板設計中。The first electrode 100 and the second electrode 110 are designed to have a narrow shape, that is, the line width of the electrode is substantially reduced, so that the distance between the electrodes is increased, and the narrowing and narrowing of the bridge design can make the two electrodes overlap. The area is further reduced, and all of the above designs can make the C P value of the driving node's sensing capacitance small. In this way, when the touch behavior occurs, the capacitance change ratio ΔC P changes relatively large, which contributes to the sensing of the touch and increases the sensitivity of the sensing. The increase in sensing sensitivity also makes the present invention conditionally applicable to the touch panel design of a two-layer ultra-thin film substrate with more stringent capacitance change ratio conditions in the future.
另一方面，本新型的優點在於，就互容式感應技術而言，發射電極(Tx，即第二電極110)與接收電極(Rx，即第一電極100)交會處的電容訊號最強，越往方形感應區域內部，如區域中心點，其電容訊號越弱。本新型不採用習知技術縮小電極節距或是高壓驅動/高製作成本的作法，而以主分支電極與次分支電極之新型設計來達到有效覆蓋方形感應區域內部的空乏區域之功效，以增強該處的電容訊號，改善了習知技術中互容式感應解析度不足的問題，同時又不會造成第一電極100與第二電極110有過多的重合區域，進而造成驅動節點的感應電容C P 值變大而使得感測靈敏度變小。On the other hand, the advantage of the present invention is that, in the case of the mutual capacitance sensing technology, the capacitance signal at the intersection of the transmitting electrode (Tx, that is, the second electrode 110) and the receiving electrode (Rx, that is, the first electrode 100) is the strongest. Inside the square sensing area, such as the center point of the area, the weaker the capacitance signal. The novel does not use the conventional technique to reduce the electrode pitch or the high voltage driving/high manufacturing cost, and the new design of the main branch electrode and the secondary branch electrode achieves the effect of effectively covering the depletion region inside the square sensing region, thereby enhancing The capacitance signal at the location improves the problem of insufficient resolution of the mutual capacitance sensing in the prior art, and does not cause excessive overlap of the first electrode 100 and the second electrode 110, thereby causing the sensing capacitance C of the driving node. The P value becomes large so that the sensing sensitivity becomes small.
再者，填補剩餘空乏區域的虛置導體塊120與第二電極110都設置在基板130的下表面，兩者共同作為上方第一電極100與下方液晶模組150之間的電磁屏蔽，以減少感測雜訊。虛置導體塊120亦可作為圖中磁力線的 跳板，達到降低感應電容C P 值的效果。Moreover, the dummy conductor block 120 and the second electrode 110 filling the remaining depletion region are both disposed on the lower surface of the substrate 130, and the two are collectively used as electromagnetic shielding between the upper first electrode 100 and the lower liquid crystal module 150 to reduce Sensing noise. The dummy conductor block 120 can also serve as a springboard for the magnetic lines in the figure to achieve the effect of reducing the C P value of the sensing capacitor.
故綜合上述說明，本新型的分支電極設計較之習知技術能有效提升電容感應的靈敏度與解析度，減少所需設置的電極pin數目以及製作成本，其兼具實質的特徵創新與功效。Therefore, in combination with the above description, the branch electrode design of the present invention can effectively improve the sensitivity and resolution of the capacitive sensing, reduce the number of electrode pins required and the manufacturing cost, and have both substantial feature innovation and efficacy.
以上所述僅為本新型之較佳實施例，凡依本新型申請專利範圍所做之均等變化與修飾，皆應屬本新型之涵蓋範圍。The above description is only the preferred embodiment of the present invention, and all the equivalent changes and modifications made by the scope of the present patent application should fall within the scope of the present invention.
100‧‧‧第一電極100‧‧‧first electrode
106‧‧‧第一主分支電極106‧‧‧First main branch electrode
110‧‧‧第二電極110‧‧‧second electrode
116‧‧‧第二主分支電極116‧‧‧Second main branch electrode
118‧‧‧第二次分支電極118‧‧‧Second branch electrode
120‧‧‧虛置導體塊120‧‧‧Virtual conductor block
Claims (13)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI553522B (en) * | 2014-11-04 | 2016-10-11 | 群創光電股份有限公司 | Touch substrate |
| TWI570617B (en) * | 2015-09-21 | 2017-02-11 | 矽創電子股份有限公司 | Capacitive Touch Apparatus |
| TWI601045B (en) * | 2015-08-07 | 2017-10-01 | 瑞鼎科技股份有限公司 | Panel display driving circuit and touch time arranging method |
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2014
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI553522B (en) * | 2014-11-04 | 2016-10-11 | 群創光電股份有限公司 | Touch substrate |
| TWI601045B (en) * | 2015-08-07 | 2017-10-01 | 瑞鼎科技股份有限公司 | Panel display driving circuit and touch time arranging method |
| TWI570617B (en) * | 2015-09-21 | 2017-02-11 | 矽創電子股份有限公司 | Capacitive Touch Apparatus |
| CN106547413A (en) * | 2015-09-21 | 2017-03-29 | 矽创电子股份有限公司 | Capacitive touch device |
| CN106547413B (en) * | 2015-09-21 | 2020-03-10 | 矽创电子股份有限公司 | Capacitive touch device |
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