TWI514212B - Touch panel capable of detecting a stylus and a method of using the same - Google Patents
Touch panel capable of detecting a stylus and a method of using the same Download PDFInfo
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- TWI514212B TWI514212B TW102130145A TW102130145A TWI514212B TW I514212 B TWI514212 B TW I514212B TW 102130145 A TW102130145 A TW 102130145A TW 102130145 A TW102130145 A TW 102130145A TW I514212 B TWI514212 B TW I514212B
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Description
本發明係有關一種觸控面板,特別是關於一種可偵測觸控筆(stylus)的觸控面板。The present invention relates to a touch panel, and more particularly to a touch panel capable of detecting a stylus.
觸控筆(stylus)為觸控螢幕的一種輔助工具。觸控筆的尖端很小,因而很難被一般的觸控螢幕感測到。因此,在使用一般的觸控螢幕時,通常需使用特殊製造的電容性觸控筆。The stylus is an auxiliary tool for touch screens. The tip of the stylus is so small that it is difficult to be sensed by a typical touch screen. Therefore, when using a general touch screen, a specially manufactured capacitive stylus is usually required.
然而,傳統觸控筆(例如電容性觸控筆)需耗費相當的製程及成本。再者,遇到故障、遺忘或者遺失時,電容性觸控筆不容易立即作更換。However, traditional styluses (such as capacitive styluses) require considerable processing and cost. Furthermore, capacitive stylus is not easy to replace immediately when it is faulty, forgotten or lost.
因此亟需提出一種新穎機制以偵測觸控筆(特別是非特殊製造的觸控筆),提供更多的便利性給一般觸控螢幕的使用者。Therefore, there is a need to propose a novel mechanism for detecting styluses (especially non-specially manufactured styluses), providing more convenience to users of general touch screens.
鑑於上述,本發明實施例的目的之一在於提出一種觸控面板及其方法,較傳統觸控面板更有效率且更正確地偵測觸控筆。In view of the above, one of the objects of the embodiments of the present invention is to provide a touch panel and a method thereof, which are more efficient and more accurate than conventional touch panels.
根據本發明實施例,可偵測觸控筆的觸控面板包含沿第一軸向設置的複數電極列,及沿第二軸向設置的複數電極行。每一電極列與電極行的交會處具互電容,且每一電極列與每一電極行具有自電容。於一自掃瞄週期內施一電壓於電極行或電極列,再量測相同的電極行或電極列以偵測觸碰觸控面板之表面的觸控筆。於一互掃瞄週期內施一電壓於一軸向,再量測另一軸向以偵測觸碰觸控面板之表面的觸控筆。於每一掃瞄訊框內,執行至少一自掃瞄週期及至少一互掃瞄週期,且當自掃瞄週期與互掃瞄週期都被偵測到時,觸控筆的觸碰識別才會被確認。According to an embodiment of the invention, a touch panel capable of detecting a stylus includes a plurality of electrode columns disposed along a first axial direction and a plurality of electrode rows disposed along a second axial direction. The intersection of each electrode column and the electrode row has mutual capacitance, and each electrode column and each electrode row have a self-capacitance. A voltage is applied to the electrode row or the electrode column during a self-scanning cycle, and the same electrode row or electrode column is measured to detect the stylus that touches the surface of the touch panel. A voltage is applied to an axial direction during an inter-scan period, and another axial direction is measured to detect a stylus that touches the surface of the touch panel. During each scan frame, at least one self-scan period and at least one mutual scan period are performed, and when the self-scan period and the mutual scan period are detected, the touch recognition of the stylus is performed. be confirmed.
第一圖顯示本發明實施例的觸控面板100的示意圖。本實施例之觸控面板100可應用於電子裝置,例如行動電話。觸控面板100(例如電容式觸控面板)由電極列11及電極行12所組成。每一電極列11與電極行12的交會處具互電容(mutual capacitance)Cm ;而每一電極列11與每一電極行12則具有自電容(selfcapacitance)Cs 。本實施例之觸控面板100可較傳統觸控面板更有效率及更正確地偵測觸控筆以執行相關功能。本實施例所稱的觸控筆可泛指一般非特殊製造或電容式的觸控筆。The first figure shows a schematic diagram of a touch panel 100 according to an embodiment of the present invention. The touch panel 100 of the present embodiment can be applied to an electronic device such as a mobile phone. The touch panel 100 (for example, a capacitive touch panel) is composed of an electrode array 11 and an electrode row 12. Each of the electrode columns 11 and the electrode row 12 has a mutual capacitance C m ; and each of the electrode columns 11 and each electrode row 12 has a selfcapacitance C s . The touch panel 100 of the present embodiment can detect the stylus more efficiently and correctly than the conventional touch panel to perform related functions. The stylus referred to in this embodiment can generally refer to a stylus which is generally not specially manufactured or capacitive.
繼續參閱第一圖,對於自電容Cs ,於自掃瞄(selfscan)週期內施一電壓於電極行12或電極列11,再藉由偵測電路(未顯示)量測相同的電極行12或電極列11以偵測觸碰觸控面板100正面(或觸控面)的觸控筆。對於互電容Cm ,於互掃瞄(mutual scan)週期內施一電壓於一軸(例如電極行12),再藉由偵測電路量測另一軸(例如電極列11)以偵測觸碰觸控面板100的觸控筆。Continuing to refer to the first figure, for the self-capacitance C s , a voltage is applied to the electrode row 12 or the electrode column 11 during the self-scan period, and the same electrode row 12 is measured by a detecting circuit (not shown). Or the electrode array 11 to detect a stylus that touches the front side (or the touch surface) of the touch panel 100. For the mutual capacitance C m , a voltage is applied to one axis (for example, the electrode row 12) during the mutual scan period, and another axis (for example, the electrode column 11) is measured by the detecting circuit to detect the touch. The stylus of the control panel 100.
第二圖的示意圖例示掃瞄(或量測)訊框(scan frame)序列。根據本實施例的特徵之一,可將複數(如第二圖例示的十個)先前掃瞄訊框之(相關於自電容Cs 的)自原始資料(self raw data)予以累加。鑑於觸控筆於偵測時所得到的自原始資料之強度通常很弱,因此累加掃瞄訊框之自原始資料後,可以增強觸控靈敏度。The schematic of the second diagram illustrates a scan (or measurement) scan frame sequence. According to one of the features of the embodiment, a complex number (as for the ten illustrated in the second figure) of the previous scan frame (related to the self-capacitance C s ) can be accumulated from the self raw data. Since the intensity of the original data obtained by the stylus during detection is usually weak, the touch sensitivity can be enhanced by accumulating the original information of the scanning frame.
根據本實施例的另一特徵,繼續參閱第二圖,於每一掃瞄訊框內,執行複數(如第二圖例示的二個)相同的自掃瞄週期(self scan cycle),再將該些自掃瞄週期的自掃瞄原始資料予以加總。藉此,該些加總的自原始資料可加強觸控面板100的觸控靈敏度。According to another feature of the embodiment, referring to the second figure, in each scan frame, a plurality of self-scan cycles (such as the two illustrated in the second figure) are executed, and then The self-scanning raw materials of the self-scanning cycle are summed up. Thereby, the total self-original data can enhance the touch sensitivity of the touch panel 100.
根據本實施例的又一特徵,繼續參閱第二圖,每一掃瞄訊框內除了執行一或多次自掃瞄週期外,還執行了至少一次互掃瞄週期(mutual scan cycle),如第二圖所例示。所執行之互掃瞄週期之(相關於互電容Cm 的)互原始資料(mutual raw data)可用以確認觸控筆觸碰觸控面板100的表面。例如,在本實施例中,僅有在自掃瞄週期與互掃瞄週期都被偵測到時,觸碰識別才會被確認。換句話說,在本實施例中,若自掃瞄週期或互掃瞄週期其中之一未被偵測到,則觸碰識別即不會被確認。同時執行自掃瞄週期與互掃瞄週期可用以防止週邊環境變化對於觸控面板100的影響。According to still another feature of the embodiment, referring to the second figure, in addition to performing one or more self-scanning cycles, each scan frame performs at least one mutual scan cycle, such as The two figures are illustrated. The mutual raw data of the mutual scanning cycle (related to the mutual capacitance Cm ) can be used to confirm that the stylus touches the surface of the touch panel 100. For example, in this embodiment, the touch recognition is confirmed only when both the self-scan period and the mutual scan period are detected. In other words, in this embodiment, if one of the self-scanning period or the inter-scanning period is not detected, the touch recognition is not confirmed. Simultaneous execution of the self-scanning cycle and the mutual scanning cycle can be used to prevent the influence of the surrounding environment change on the touch panel 100.
在本實施例中,如第三A圖所示,對於自電容Cs ,當(一或多自掃瞄週期的)自原始資料大於預設自觸碰臨界值THs 時,觸碰識別才算是被偵測到。如第三B圖所示,對於互電容Cm ,當(至少一互掃瞄週期的)互原始資料大於預設互觸碰臨界值THm 時,觸碰識別才算是被偵測到。In the present embodiment, as shown in FIG. A third, For the self-capacitance C s, when the data from the original greater than a predetermined (or a self-scanning period) from the touch threshold value TH s, touching only identified It is detected. As shown in FIG. B, for the mutual capacitance C m , when the mutual original data (at least one mutual scanning period) is greater than the preset mutual touch threshold TH m , the touch recognition is detected.
第四圖顯示本發明實施例之識別觸控筆之觸碰動作的流程圖。於步驟41,將(掃瞄訊框之一或多自掃瞄週期中)自電容Cs 相應的自原始資料與自觸碰臨界值THs 作比較。如果步驟41的結果是否定的(亦即,自原始資料非大於自觸碰臨界值THs ),則忽略觸碰動作(步驟42)。否則,流程進入步驟43,將(掃瞄訊框中)互電容Cm 相應的互原始資料與互觸碰臨界值THm 作比較。如果步驟43的結果是否定的(亦即,互原始資料非大於互觸碰臨界值THm ),則忽略觸碰動作(步驟44);否則,於步驟45,累進計數值。若計數值未大於設定值(步驟46的“否”分支路徑),則流程回到步驟41以處理下一掃瞄訊框。若計數值大於設定值(步驟46的“是”分支路徑),則觸碰動作即被識別且觸控面板100進入觸控筆模式(步驟47)。如第三A圖或第三B圖所示,使用計數值並配合設定值以防止因不穩原始資料所造成的錯誤觸碰識別。在本實施例中,如第四圖所示流程,僅有當原始資料穩定之後(亦即,原始資料大於觸碰臨界值達到預設次數),觸碰動作才會被真正識別。於進入觸控筆模式後(換句話說,離開手指模式後),需要調整一些參數。例如,增加原始資料大於觸碰臨界值之預設次數,以增強觸碰識別的準確度。再者,於觸控筆模式中,侷限演算法於單點觸碰的識別,而非手指模式中多點觸碰的識別。The fourth figure shows a flow chart of the touch action of the recognition stylus according to the embodiment of the present invention. In step 41, the self-origin data from the capacitance C s is compared with the self-touch threshold TH s (in one or more self-scanning cycles of the scan frame). If the result of step 41 is negative (i.e., greater than from the original data from the non-touch threshold value TH s), the touch operation is ignored (step 42). Otherwise, the process proceeds to step 43, and the mutual raw data corresponding to the mutual capacitance C m (scanning frame) is compared with the mutual touch threshold value TH m . If the result of step 43 is negative (i.e., the mutual original data is not greater than the mutual touch threshold TH m ), the touch action is ignored (step 44); otherwise, at step 45, the count value is incremented. If the count value is not greater than the set value ("no" branch path of step 46), then the flow returns to step 41 to process the next scan frame. If the count value is greater than the set value ("YES" branch path of step 46), the touch action is recognized and the touch panel 100 enters the stylus mode (step 47). As shown in the third A diagram or the third B diagram, the count value is used in conjunction with the set value to prevent false touch recognition caused by unstable original data. In this embodiment, as shown in the fourth figure, the touch action is truly recognized only after the original data is stabilized (that is, the original data is greater than the touch threshold by a preset number of times). After entering the stylus mode (in other words, after leaving the finger mode), some parameters need to be adjusted. For example, increasing the original data is greater than the preset number of touch thresholds to enhance the accuracy of the touch recognition. Furthermore, in the stylus mode, the localized algorithm is recognized by a single touch, not by the multi-touch in the finger mode.
第五圖顯示本發明實施例之解除觸控筆之觸碰動作(離開觸控筆模式)的流程圖。於步驟51,將(掃瞄訊框之一或多自掃瞄週期中)自電容Cs 相應的自原始資料與自觸碰臨界值THs 作比較。如果自原始資料非小於自觸碰臨界值THs ,則忽略自原始資料(步驟52)。否則,流程進入步驟53,將(掃瞄訊框中)互電容Cm 相應的互原始資料與互觸碰臨界值THm 作比較。如果互原始資料非小於互觸碰臨界值THm ,則忽略互原始資料(步驟54);否則,於步驟55,累進計數值。若計數值未大於設定值(步驟56的“否”分支路徑),則流程回到步驟51以處理下一掃瞄訊框。若計數值大於設定值(步驟56的“是”分支路徑),則觸碰動作即被解除且觸控面板100離開觸控筆模式(步驟57)。如第三A圖或第三B圖所示,使用計數值並配合設定值以防止因不穩原始資料所造成的錯誤觸碰解除。在本實施例中,如第五圖所示流程,僅有當原始資料穩定之後(亦即,原始資料小於觸碰臨界值達到預設次數),觸碰動作才會被真正解除。The fifth figure shows a flow chart of releasing the touch action of the stylus (away from the stylus mode) in the embodiment of the present invention. In step 51, the self-origin data from the capacitance C s is compared with the self-touch threshold TH s (in one or more self-scanning cycles of the scan frame). If the original data is not less than the self-touch threshold TH s , the original data is ignored (step 52). Otherwise, the process proceeds to step 53 to compare the mutual original data corresponding to the mutual capacitance C m (scanning frame) with the mutual touch threshold value TH m . If the mutual original data is not less than the mutual touch threshold TH m , the mutual original data is ignored (step 54); otherwise, in step 55, the count value is incremented. If the count value is not greater than the set value ("no" branch path of step 56), then the flow returns to step 51 to process the next scan frame. If the count value is greater than the set value ("YES" branch path of step 56), the touch action is released and the touch panel 100 leaves the stylus mode (step 57). As shown in the third A diagram or the third B diagram, the count value is used in conjunction with the set value to prevent the erroneous touch release due to the unstable original data. In this embodiment, as shown in the fifth figure, the touch action is actually cancelled only after the original data is stabilized (that is, the original data is less than the touch threshold reaches a preset number of times).
第六圖顯示本發明另一實施例之解除觸控筆之觸碰動作(離開觸控筆模式)的流程圖。於步驟61,將(掃瞄週期中)互電容Cm 相應的互原始資料與手指模式之手指觸碰相關的互臨界值TH作比較。上述手指觸碰相關的互臨界值TH通常大於觸控筆模式之觸控筆觸碰相關的互觸碰臨界值THm 。如果互原始資料非大於互臨界值TH,則忽略互原始資料(步驟62)。否則,如果互原始資料大於互臨界值TH,表示手指觸碰到觸控面板100,則觸控筆之觸碰動作即被解除且觸控面板100離開觸控筆模式(步驟63)。The sixth figure shows a flow chart of releasing the touch action of the stylus (away from the stylus mode) according to another embodiment of the present invention. In step 61, the mutual original data corresponding to the mutual capacitance C m (in the scanning cycle) is compared with the mutual threshold TH associated with the finger touch of the finger mode. The mutual threshold TH associated with the above finger touch is generally greater than the mutual touch threshold TH m associated with the stylus touch of the stylus mode. If the mutual original data is not greater than the mutual threshold TH, the mutual original data is ignored (step 62). Otherwise, if the mutual original data is greater than the mutual threshold TH, indicating that the finger touches the touch panel 100, the touch action of the stylus is released and the touch panel 100 leaves the stylus mode (step 63).
以上所述僅為本發明之較佳實施例而已,並非用以限定本發明之申請專利範圍;凡其它未脫離發明所揭示之精神下所完成之等效改變或修飾,均應包含在下述之申請專利範圍內。The above description is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; all other equivalent changes or modifications which are not departing from the spirit of the invention should be included in the following Within the scope of the patent application.
100‧‧‧觸控面板100‧‧‧ touch panel
11‧‧‧電極列
12‧‧‧電極行
41~47‧‧‧識別觸控筆之觸碰動作的步驟
51~57‧‧‧解除觸控筆之觸碰動作的步驟
61~63‧‧‧解除觸控筆之觸碰動作的步驟
Cs
‧‧‧自電容
Cm
‧‧‧互電容
THs
‧‧‧自觸碰臨界值
THm
‧‧‧互觸碰臨界值
TH‧‧‧互臨界值11‧‧‧electrode column
12‧‧‧electrode row
41~47‧‧‧Steps to recognize the touch action of the stylus
51~57‧‧‧Steps to remove the touch action of the stylus
61~63‧‧‧Steps to remove the touch action of the stylus
C s ‧‧‧Self capacitance
C m ‧‧‧ mutual capacitance
TH s ‧‧‧self-touch threshold
TH m ‧‧‧ mutual touch threshold
TH‧‧‧ Mutual Threshold
第一圖顯示本發明實施例的觸控面板的示意圖。第二圖的示意圖例示掃瞄訊框序列。第三A圖顯示自原始資料相對於預設自觸碰臨界值。第三B圖顯示互原始資料相對於預設互觸碰臨界值。第四圖顯示本發明實施例之識別觸控筆之觸碰動作的流程圖。第五圖顯示本發明實施例之解除觸控筆之觸碰動作的流程圖。第六圖顯示本發明另一實施例之解除觸控筆之觸碰動作的流程圖。The first figure shows a schematic diagram of a touch panel according to an embodiment of the invention. The schematic of the second figure illustrates a scan frame sequence. The third A picture shows the threshold value from the original data relative to the preset self-touch. The third B graph shows the threshold value of the mutual original data relative to the preset mutual touch. The fourth figure shows a flow chart of the touch action of the recognition stylus according to the embodiment of the present invention. The fifth figure shows a flow chart of releasing the touch action of the stylus according to the embodiment of the present invention. The sixth figure shows a flow chart of releasing the touch action of the stylus according to another embodiment of the present invention.
41~47‧‧‧識別觸控筆之觸碰動作的步驟41~47‧‧‧Steps to recognize the touch action of the stylus
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TW201508575A (en) | 2015-03-01 |
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