200849072 九、發明說明： 【發明所屬之技術領域】 本發明_於觸控面板之領域，更係關於___定電容式觸 控面板之觸控螢幕上觸點位置的裝置及方法。 【先前技術】 傳統上，電子裝置之輸入係以鍵盤與滑鼠為之，而不能以人 類直覺方式為之。之後，觸控面板漸導用於各類大小型電子裝置 中，使用者得以手或觸控筆觸及其上之勞幕的方式進行觸點輸 入，此時螢幕下方所設之感測裝置感測觸點輸入的位置，藉以達 成觸控電子裝置之操作的目的。以感測觸點輸人之感測機制分， 觸控面板可分類為電阻式、電容式、表面聲波(SAW)式及紅外線 (iR)式等觸控面板。 以電容式觸控制感測機制為基礎之電容式觸控面板為例，其 係藉由感測一觸點輸入位置之各側電流、並藉該等電流之相互關 係而判定出該觸點輪入的位置。請參閱第一圖，其為一電容式觸 控面板之觸點輸入位置感測的說明示意圖。如圖所示，一電容式 觸控面板10包含_觸控螢幕u，該觸控螢幕u在邏輯上包含 B C及，且該a、b、C及D區之劃分如一’’田”字形， 並S別被加上一相同的交流掃描訊號Ac 1、AC2、AC3及AC4， 此時藉感測該四掃描訊號AC1、AC2、AC3及AC4至一輸入觸 點P之路徑R1、R2、R3及R4上的電流大小Π、12、13及η即 可計算出該輸入觸點P的座標位置（X，Y)，其中該四電流II、12、 13及14之大小因輸入觸點Ρ而變得不同之原因為輸入觸點（如使 200849072 用者的手指）p為可導電者，其將改變觸控螢幕u上其所在位置 (X，Y)處的阻抗，且該輸入觸點P之橫軸座標X與縱軸座標γ與 該等電流II、12、13及14的關係分別為： 卜(Δ/4+ΔΟ)-⑽ +简 ，及 (1) Σ淡·， (2) 其中ζί/φ·=：1、2、3及4)為觸點ρ在被輸入後之電流/ζ·與輸入前 的電流//的差值。 一；、、':而觸拴螢幕丨1與使用者所在位置的參考地電位通常不 同，故使用者的手指會將雜訊帶至觸控螢幕11上，且觸控螢幕 勺周圍裒i兄也了犯Υ入雜訊，如液晶螢幕或陰極射線管螢幕之 電磁輻射即構成一雜訊，故單以此方式感測得之觸點輸入位置常 有誤差。 因此之故，各種將雜訊加以去除的技術便被陸續提出，以冀 能有效使觸點位置的判斷不因雜訊而有誤差。 鑑於上述問題，本案發明人亦在經長期研究後提出—種判定 電容式觸控面板之觸控螢幕上觸點位置的裝置及方法。 【發明内容】 鑑於上述需求，本發明之一目的即在於提出一種判定電容式 觸控面板之觸控螢幕上觸點位置的裝置及方法，細更精確判定 輸入觸點的所在位置。 本毛明之判定電谷式觸控面板上觸控勞幕之觸點位置的装 置包含-訊號提供單元、-頻率切換單元、驅動及電流感 200849072 測單元、-有效頻率選定單元、-有效電流值選取單元及一位置 座標計算單元，龍號提供單元用以提供朗控㈣之四角落處 以-具—頻率之交流掃描訊號；該頻率切換單元用以快速切換該 四角落處之對應交流訊號的頻率於—組特定頻率之間；該電壓驅 動及電流感測單元用以分別驅動該觸控螢幕以該對應掃描訊 號，並分別❹m四角落處之對應組特定解㈣流值；該有效 頻率選定單元用以分別接收該四角落處之對應特定頻率組的電 流值’並分別對該四角落處之對應特定解組之電流值的每—者 依據一雜訊濾除程序選出—組選定頻率；該有效電流值選取單元 =以分對運异該四角落處之對應選定頻率組中之頻率對應的電 流值，=得到—最終電流值；該位置座標計算單元用以分別根據 «亥四角洛處對應之最終電流值計算該觸點輸入在該觸控營幕上 的座標。 在-較佳實施例中，該雜訊濾除程序包含下列步驟：判定該 四角洛處對應之特定頻率組中之一或多對應電流值之具較大 動量者的頻率，以作A _ *、 〆 皮 作為一或夕待濾除頻率；及分別濾除該四角茨 處對應之特定頻率，6且φ夕 ^ y 率. 、丰、、且中之-或細除頻率，以作為該組選定頻 的步驟:异乂驟為—加成該組選定頻率中之頻率對應之電流值 在μ土實施例中’該雜訊遽除程序包含下列步 定周圍環境及使用者對該觸控螢幕之四㈣處造成之 =’藉感測該四角落處對應之特定頻率組中之頻率‘ 電流值之波動詈Μ 士 ^ ^ 方式為之；及分別濾除該四角落處對應之特定 頻率組中之同於兮— 饤疋 及該組特定《"日 鮮的頻率，㈣為該組選定頻率 頻率’且該運算步驟為一力口成該組選定頻率中之頻率 200849072 對應之電流值的步驟· 行。 ^雜訊濾除程序僅於一特定時機被執 測該四角落處對應乂::雜矾濾除程序包含下列步驟··分別感 動量；及分別選取該四角H率組中之頻率所形成之電流值的波 之具-最小波動旦杏、/各处對應之特定頻率組中對應之電流值 之頻率作為該組;率’並分別以該㈣^ -加成該組選定頻率;=；：定頻率。此外’該運軸 除程序僅於-特定時機:::對應伽 法包含下列Γ判疋電谷式觸控面板上觸控勞幕之觸點位置的方 之交_:;==:_螢幕之四角落處以-具-頻率 率於一组特定77 &切換相角落處之對應交流訊號的頻 ’、率之間；分別感測該四角落處之對應組特定頻率 八1值；分別接收該四角、落處之對應特㈣率組的電流值，並 刀別對θ四角洛處之對應特定頻率組之電流值的每—者依據一 雜訊慮除程序選出—組選定頻率；分別對該四角落處之對應選定 頻率組中之頻率對應的電流值加以運算得到-最終電流值；並分 ==落處對應之最終電流值計算該觸點輸入在該觸控 在一較佳實施例中，該雜訊濾除程序包含下列步驟：判定該 四=落處對應之特㈣率組中之—或多對應電流值之具較大波 動量者的頻率’以作為—或多待《頻率；及分職除該四角落 處對應之特定頻率纟a中之—或？待濾除頻率，以作為該組選定頻 率。此外，該運算步驟為一加成該組選定頻率中之頻率對應之電 流值的步驟。 200849072 在一較佳實施例中，兮 定周圍環境物者_ 驟：分別判 訊頻率，藉感測該四角落處 a四角洛處&成之-或多雜 Φ ^ ^ ^ Λ, 士應之特定頻率組中之頻率所形> 電机值之波動量的方式為 、形成之 頻率組中之同於該-或多雜二^域除該四角落處對應之特定 及該組特定頻率。此外，节運^的頻率，以作為該組選定頻率 頻率對應之電流值的步驟==: 執行。 以雜戒慮除知序僅於—特定時機被 在-較佳實_中，該雜訊濾 測該四角落處對應之特定頻率…广3下列步驟.分別感 動量；及分別選取該四角茨岸之^率所形成之電流值的波 之具-最小波動量者的==應=:頻率組中對應之電流值 之頻率作為分別以該具最小電流波動量 、、—^疋〃員率及該組特定頻率。此外，該運算牛 加成雜較頻率巾之頻率㈣之電流 ^清 除程序僅於-特定時機被執行。 冑^雜^慮 猎由使用本發明，由於電容錢控面板 ㈣斷受雜訊的影響較低，故足能改善習知技術:== 疋不佳的缺點。 1力 【實施方式】 μ本㈣為—種判定電容式觸控面板之觸控榮幕上觸點位置 的裝置及方法’其將藉由較佳實施例配合所附圖式詳細說明如 下。 第图所示為本發明之降低電容式觸控面板之觸控螢幕上 200849072 觸點位置的基本原理說明示意圖。如圖所示，一 电谷式觸控面板 20包含一觸控螢幕21，該觸控螢幕21在邏輯上包含A、b 及D區，且該a、B、C及D區之晝分如同_，， ^ 』 田子形，並分別 在觸控螢幕21的四角落處被透過一對應線路路徑Ri、R2、 及R4加上-相同的交流式掃描訊號AC i、AC2、AC3及AC4， 以感測在觸控螢幕21上之一輸入觸點P的位置， / 訊號ACh AC2 m AC4可為方波或弦波等。此時，= 測該四掃描訊號AC1、AC2、AC3及AC4至該輸入觸點p之路 徑R卜R2、R3及R4上的電流值„、12、13及14，該輸入觸點 p的座標位置（χ，γ)可被計算出，其中該四電流n、12、13及14 之大小因輸入觸點P而變得不同之原因為輸入觸點(如使用者的 手指）P為可導電者，其將改變觸控螢幕u上其所在位置（χ,γ) 處的阻抗，且該輸入觸點ρ之橫軸座標χ與縱軸座標Υ舆該等 電流II、12、13及14的關係分別為： 一 (ΔΓ4+Δ/3) - (Μ+ΔΓ2) ，及 (3) 一 (M+辦- (2V2+A8) Σ淡 ， ⑷ 其中2//(/=1、2、3及4)為觸點ρ在被輸入後之電流乃與輸入前 的電流//的差值。 為使觸點P輸入時之伴隨雜訊效應有效降低，以不致將最後 的輸入觸點P位置（χ，γ)做錯誤判斷，本發明之該四交流訊號n、 12、13及14分別被提供η個頻率f 1、、f3、· · ·、行、…、及fn， 以被連續切換在該n個頻率fl、f2、f3、…、fi、…、及之間， 其說明示意圖如第三圖所示。 10 200849072 在第三圖中，標號0、0、〇、〜、行、，、及如為各不同 頻率，且其後各有~訊號，即為對應料頻率fl、f2、f3、·.·、 卜…、及fn的掃描訊號AC1、AC2、AC3及AC4之一者。在200849072 IX. Description of the Invention: [Technical Field] The present invention is in the field of touch panels, and more relates to an apparatus and method for the position of a touch screen on a touch screen of a ___ fixed capacitive touch panel. [Prior Art] Conventionally, the input of an electronic device is based on a keyboard and a mouse, and cannot be in a human intuitive manner. After that, the touch panel is gradually used in various types of electronic devices, and the user can perform contact input by means of a hand or a touch stroke and a screen on the screen, and the sensing device provided under the screen is sensed. The position of the contact input for the purpose of operating the touch electronic device. The touch panel can be classified into a touch panel such as a resistive type, a capacitive type, a surface acoustic wave (SAW) type, or an infrared (iR) type by sensing the sensing mechanism of the contact input. Taking a capacitive touch panel based on a capacitive touch control sensing mechanism as an example, it is determined by sensing the current of each side of a contact input position and determining the contact wheel by the mutual relationship of the currents. Into the location. Please refer to the first figure, which is a schematic diagram of the contact input position sensing of a capacitive touch panel. As shown in the figure, a capacitive touch panel 10 includes a touch screen u, which logically includes BC and, and the a, b, C, and D regions are divided into a 'Tian' shape. And S is added with the same AC scan signals Ac 1, AC2, AC3 and AC4, at this time by sensing the four scan signals AC1, AC2, AC3 and AC4 to an input contact P path R1, R2, R3 And the current magnitudes Π, 12, 13 and η on R4 can calculate the coordinate position (X, Y) of the input contact P, wherein the magnitudes of the four currents II, 12, 13 and 14 are due to the input contact The reason for the difference is that the input contact (such as the user's finger of 200849072) p is a conductive person, which will change the impedance at the position (X, Y) of the touch screen u, and the input contact P The relationship between the horizontal axis coordinate X and the vertical axis coordinate γ and the currents II, 12, 13 and 14 are: (Δ/4+ΔΟ)-(10)+simple, and (1) bleak·, (2) Where ζί/φ·=: 1, 2, 3, and 4) is the difference between the current / ζ of the contact ρ after being input and the current / / before the input. A;,, ': and touch the screen 丨1 with the reference location of the user's location The bits are usually different, so the user's finger will bring the noise to the touch screen 11, and the brother around the touch screen spoon will also get into the noise, such as the electromagnetic radiation of the LCD screen or the cathode ray tube screen. Forming a noise, so the contact input position sensed by this method often has errors. Therefore, various techniques for removing noise are successively proposed, so that the position of the contact can be effectively judged. In view of the above problems, the inventors of the present invention have also proposed a device and method for determining the position of the touch screen on the touch screen of the capacitive touch panel after long-term research. An object of the present invention is to provide a device and a method for determining the position of a contact on a touch screen of a capacitive touch panel, and to more accurately determine the position of the input contact. The device for touching the contact position of the screen comprises: a signal providing unit, a frequency switching unit, a driving and current sense 200849072 measuring unit, an effective frequency selecting unit, and an effective current value selection. And a position coordinate calculation unit, the dragon number providing unit is configured to provide an AC scan signal with a frequency of -4 at the four corners of the remote control (4); the frequency switching unit is configured to quickly switch the frequency of the corresponding AC signal at the four corners a voltage-driving and current sensing unit for respectively driving the touch screen to the corresponding scanning signal, and respectively corresponding to a corresponding group (four) stream value at four corners of the m; the effective frequency selecting unit is used Selecting a selected frequency according to a noise filtering procedure for respectively receiving a current value ' corresponding to a specific frequency group at the four corners and separately corresponding current values of the corresponding specific ungrouping at the four corners; The current value selection unit=the current value corresponding to the frequency in the corresponding selected frequency group at the four corners of the four-corner pair is obtained as the final current value; the position coordinate calculation unit is used according to the corresponding position of the The final current value calculates the coordinates of the contact input on the touch screen. In a preferred embodiment, the noise filtering process includes the steps of: determining a frequency of one or more corresponding current values in the particular frequency group corresponding to the four corners to have a larger momentum for A _ * , molting as a one or eve to filter the frequency; and separately filtering out the specific frequency corresponding to the four corners, 6 and φ ^ ^ y rate., abundance, and the medium- or fine-divided frequency, as the group Step of selecting a frequency: the difference is - adding the current value corresponding to the frequency in the selected frequency of the group in the μ soil embodiment. The noise removal program includes the following steps for the surrounding environment and the user to the touch screen The fourth (four) is caused by = 'by sensing the frequency in the specific frequency group corresponding to the four corners', the fluctuation of the current value is ^ ^ way; and filtering out the corresponding frequency group corresponding to the four corners respectively The same is true for 兮 饤疋 饤疋 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 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该Step · OK. ^ The noise filtering program is only tested at a specific timing. The corresponding:: The churning filter program includes the following steps: respectively, the amount of the sensing; and the frequency of the four-corner H rate group is respectively selected. The frequency of the current value - the minimum fluctuation of the apricot, / the corresponding frequency value corresponding to the specific frequency group as the group; the rate 'and the (four) ^ - added to the selected frequency of the group; =; Fixed frequency. In addition, the operation axis is only for the specific time::: The corresponding gamma method includes the following points for the contact position of the touch screen on the electric valley touch panel _:;==: _ screen The corners of the four corners are at a frequency- and rate of the corresponding AC signal at a specific 77 & switching phase corner; respectively sensing the corresponding group specific frequency VIII value at the four corners; respectively receiving The current value of the corresponding four (four) rate group of the four corners and the falling point, and each of the current values corresponding to the specific frequency group of the θ four corners is selected according to a noise discriminating program—the selected frequency of the group; respectively Calculating the current value corresponding to the frequency in the selected frequency group at the four corners to obtain a final current value; and dividing the value of the final current value corresponding to the falling point to calculate the contact input in the touch in a preferred embodiment The noise filtering program includes the following steps: determining the frequency of the four (four) rate group corresponding to the four (four) rate group or the number of the corresponding current value having a large fluctuation amount as the - or more waiting frequency And the division of the specific frequency 纟a corresponding to the four corners - ? The frequency to be filtered out as the selected frequency for the group. Moreover, the operational step is a step of adding a current value corresponding to the frequency of the selected set of frequencies. 200849072 In a preferred embodiment, determining the surrounding environment _ s: respectively determining the frequency, by sensing the four corners of a corner of the four corners of the amp; or - or more Φ ^ ^ ^ Λ, The frequency in the particular frequency group is shaped as the amount of fluctuation of the motor value, in the frequency group formed, the same or the specific frequency of the group corresponding to the four or more regions . In addition, the frequency of the throttle is performed as the step ==: as the current value corresponding to the selected frequency frequency of the group. The odds are considered to be only in the specific time is - in the better _, the noise filter corresponds to the specific frequency corresponding to the four corners ... wide 3 the following steps. respectively sense the amount; and select the four corners respectively The wave of the current value formed by the shore rate - the minimum fluctuation amount == should =: the frequency of the corresponding current value in the frequency group as the minimum current fluctuation amount, respectively And the specific frequency of the group. In addition, the current is added to the frequency of the frequency band (4). The clearing program is executed only at a specific time.胄^杂^ ́s use of the invention, because the capacitive control panel (4) is less affected by noise, so it can improve the conventional technology: == poor defects. 1 EMBODIMENT [Embodiment] μ (4) is a device and method for determining the position of a contact on a touch panel of a capacitive touch panel, which will be described in detail by the preferred embodiment with reference to the accompanying drawings. The figure shows a schematic diagram of the basic principle of the contact position of the 200849072 touch screen on the reduced capacitive touch panel of the present invention. As shown in the figure, a battery touch panel 20 includes a touch screen 21, which logically includes areas A, b, and D, and the points of the a, B, C, and D areas are like _,, ^ 』 Tianzi shape, and are respectively added to the same alternating path scanning signals AC i, AC2, AC3 and AC4 through a corresponding line path Ri, R2, and R4 at the four corners of the touch screen 21 The position of one of the input contacts P on the touch screen 21 is sensed, and the signal ACh AC2 m AC4 may be a square wave or a sine wave or the like. At this time, = the current values „, 12, 13 and 14 of the path R R2, R3 and R4 of the four scanning signals AC1, AC2, AC3 and AC4 to the input contact p are measured, and the coordinates of the input contact p The position (χ, γ) can be calculated, wherein the magnitude of the four currents n, 12, 13 and 14 is different due to the input contact P. The reason is that the input contact (such as the user's finger) P is electrically conductive. , which will change the impedance at the position (χ, γ) of the touch screen u, and the horizontal axis coordinate χ and the vertical axis coordinate of the input contact ρ are the currents II, 12, 13 and 14 The relationships are: (ΔΓ4+Δ/3) - (Μ+ΔΓ2), and (3) one (M+ office - (2V2+A8) bleak, (4) where 2//(/=1, 2, 3 and 4) The difference between the current after the input of the contact ρ and the current / / before the input. In order to effectively reduce the noise effect when the contact P is input, so as not to position the last input contact P ( χ, γ) makes a wrong judgment, the four alternating signals n, 12, 13 and 14 of the present invention are respectively supplied with n frequencies f 1 , f3 , . . . , lines, ..., and fn to be continuously switched at The n frequencies fl, f2, f3, ..., The explanations of fi, ..., and between are shown in the third figure. 10 200849072 In the third figure, the numbers 0, 0, 〇, 〜, 线, ,, and, for each different frequency, and thereafter There is a ~ signal, which is one of the scanning signals AC1, AC2, AC3 and AC4 corresponding to the material frequencies fl, f2, f3, ·.·, b..., and fn.
a圖中之掃描訊號（假設為掃描訊號八叫上被觀察得可 Μ些雜訊存在’率fi之掃描訊號上被觀察得有大雜訊存在， ”匕頻率f2及f 3則幾無雜訊的存在，表示目前在該觸控榮幕上 有頻率fl及ft的雜訊存在，i fi頻率之雜訊尤其大。由於各種 雜訊皆屬窄頻訊號，故在確定雜訊具有某—頻率之時，對掃描訊 號Acn、AC2、AC3及AC4之該雜訊頻率加以移除即可將對應 之電流值I卜12、13及14中具有雜訊者加以滤除。 在第一實施例中，頻率fii雜訊被加濾除，或可同時對頻率 Π之雜訊亦加濾除，端依一遽除之門棍值而定，該門梧值係由設 計者決定。此時，對各頻率fl、f2、f3、…、fi、…、及仏之 或Π及fi以外者之掃描訊號AC1所形成的電流值n加以平均， 以作為方知式（1)之電流η ’藉以降低頻率為fi之雜訊對方程式 (1)之電流值II的影響。同樣地，纟它掃描訊號AC2、AC3及AC4 亦在邊等頻率fl、f2、f3、…、fi、···、及fn之間快速切換，其 說明與掃描訊號AC 1者同。 在如第四圖所示之第二實施例中，頻率為fl&行或fi的掃 描訊號AC1、AC2、AC3及AC4在特定時機之一第一觸點被輸 入後即先被濾除，其掃描訊號AC1、AC2、AC3及AC4對於後 續的輸入觸點不再被切換至該頻率fi。與第一實施例相較，本實 施例在判定觸點位置時所需之掃描時間被有效縮短。請參見第四 圖，其為用以說明本實施例的說明示意圖，且為一展頻上的訊號 大小圖。如圖所示，當一特定時機之一第一個觸點被輸入至觸控 11 200849072 螢幕上時，掃描訊號（以AC1為例）之頻率在為n、f2、f3、...、 行、· · ·、及fn時的電流振幅不同一 此即表不不同頻率的雜訊（即 在對應電流II上有波動）已出現在觸 碉*工螢幕上，由第四圖可知頻 率fl及fi上各有小及大雜訊的存在 仔在此即為使用者及周圍環境 w成的雜訊。由於使用者及周圍環谙 τ兄雜Λ之加成已被測出，故可 將會在觸控螢幕上出現雜訊（頻率為 v只手马fl或fl及fl)之掃描訊號AC1 加以取出而不出現在Π、f2、f3、 ···、fl、…、及fn頻率組對應 的知描訊號AC 1中。此時，後續於 便，輸入觸點出現在觸控螢幕上時， :描訊號AC1對應之掃描頻率中便無頻率fi的存在，如此能夠 =短掃描訊號AC1所需被掃描的時間，#然此技術亦同時用於 其它掃描訊號AC2、AC3及ΑΓ4 口廿 及AC 4上’且其說明與對掃描訊號A C1 的說明同。 在第三實施例中，其設計盥第-奋 二 一芽貝她例之原理相同，但掃描 汛號AC1之被選定用頻率僅為一 71冤級值II之具最小波動 考故其判定觸點位置所需之播p主 置所而之和^田時間更進一步被縮短，豆它掃 描訊號AC2、AC3及AC4之說明亦同。 ’、 …上述特定時機可為電容錢控㈣被安裝之時、電容式觸控 螢幕被開機之時、及在電容式觸控勞 茧参上之一工作任務執行開始 之時。此外，該等頻率f丨、f2、f 释釜又九 3 •••、^•••、及^之切換速 度為任思，且該等頻率fl、、f 於200kHz。 ··· f。···、及fn皆小於等 總以此方式為之，因電流值及Μ較能反映出輸入 =的真貫對應對流值，故最後可能的觸點ρ輸人位置錯判程度 可被降低。 本!X明之降低電容式觸控面板之觸控螢幕上觸點位置的方 12 200849072 法已說明如上，並同時被整理於一流程圖中，如第五圖所示。 請參閱第五圖，在進行本發明之降低電容式觸控面板之觸控 螢幕上觸點位置的方法時，首先分別提供該觸控螢幕之四角落處 以-具厂頻率之交流掃描訊號；（剛）。接著，分縣速切換該 四角落處之對應交流訊號的頻率於—組特定頻率之間； (S502)。其後，分別駆動該觸控勞幕以該對應之掃描訊號，並分 別感測該四角落處之對應㈣定頻率的電流值⑽3)。接著，八 職收該四角落處之對應特定頻率組的電流值，並分別對該= 洛處之對應特定頻率組依據一雜訊渡除程序選出-組選定頻率 (S504)。敵，分料算該四μ叙對應選定頻率 對=流值，以得到一最終電鄉〇5)。… 座標（S5G7)。，，、“料异_輯人在朗控f幕上的 在該方法的第—較佳實施例中（如第五A圖所示）’該 w 、驟·判疋该四角落處對應之特定頻率組中之— 或夕對應電流值之具較大波動旦 、、 頻率⑻ιυ;衫㈣Γ &料—或多待據除 ]濾除该四角落處對應之特定頻率組中 夕待濾、除頻率，以作在兮☆ 、 或 為一加成該組選定頻傘中 鄹S505 在該方法的= 率對應之電流值的步驟（未顯示 人、弟一較佳貫施例中（如第五B圖所示 除程序包含下列步驟·八2 I ± °亥雜訊濾 別判定周圍環境 :四角落處造成之-或多雜訊頻率，藉感=㈣ 定頻率組中之頻率所形成之角，處對應之特 咖υ;及分別據除該四肖落處對應之特定頻=方式為之 或多雜訊頻率的頻率， " ’、、、、、之同於該一 羊以作為該組選定頻率及該组特定頻率 13 200849072 (S522)。此外，步驟s5〇5 之電流值的步驟(未顯且口^组選定頻率中之頻率對應 執行。 違雜^慮除程序僅於-特定時機被 在该方法的第三實施例中（如第五八、 角落處對應之特定筇I ^不）’勿別感測該四 叫及分別i:之頻率所形成之電流值的波動量 值之具-最=動旦::角落處對應之特定頻率組中對應之電流 量之頻率作為該^定^應頻率，並分別以該具最小電流波動 S5〇5為-加成該組選_ =羊（S532)。此外，步驟The scanning signal in the picture (assuming that the scanning signal is called to be observed to have some noise present), the scanning signal of the rate fi is observed to have a large noise, "the frequency f2 and f3 are no miscellaneous The existence of the news indicates that there are noises of frequency fl and ft on the touch screen, and the noise of the i fi frequency is especially large. Since all kinds of noises are narrow-frequency signals, it is determined that the noise has a certain At the time of frequency, the noise frequency of the scanning signals Acn, AC2, AC3, and AC4 is removed to filter out the noises corresponding to the current values I, 12, 13, and 14. In the first embodiment In the middle, the frequency fii noise is filtered out, or the noise of the frequency chirp can be filtered at the same time, and the threshold is determined according to the value of the stick, which is determined by the designer. The current value n formed by the scanning signals AC1 of the frequencies f, f2, f3, ..., fi, ..., and 仏 or fi is averaged as the current η ' of the equation (1) Reduce the effect of the current value II of the noise program (1) of the frequency fi. Similarly, it scans the signals AC2, AC3 and AC4. The fast switching between the equal frequencies fl, f2, f3, ..., fi, ..., and fn is the same as that of the scanning signal AC 1. In the second embodiment as shown in the fourth figure, the frequency is The scan signals AC1, AC2, AC3 and AC4 of the fl& line or fi are filtered out after the first contact of one of the specific timings is input, and the scanning signals AC1, AC2, AC3 and AC4 are not for the subsequent input contacts. Further, the frequency is switched to the frequency fi. Compared with the first embodiment, the scan time required for determining the position of the contact is effectively shortened in this embodiment. Please refer to the fourth figure, which is a description for explaining the embodiment. The schematic diagram is a signal size diagram on the spread spectrum. As shown in the figure, when one of the first contacts of a specific time is input to the touch screen 200849072, the frequency of the scan signal (taking AC1 as an example) When the current amplitudes are different for n, f2, f3, ..., row, · · ·, and fn, then the noise of different frequencies (that is, fluctuations in the corresponding current II) has appeared in the touch * On the screen of the work, the fourth picture shows that the existence of small and large noises on the frequencies fl and fi is here. The noise of the user and the surrounding environment. Since the user and the surrounding 谙 兄 兄 兄 已 have been detected, noise will appear on the touch screen (frequency is v hand horse fl Or the scanning signal AC1 of fl and fl) is taken out and does not appear in the known signal AC 1 corresponding to the Π, f2, f3, ···, fl, ..., and fn frequency groups. When the contact appears on the touch screen, there is no frequency fi in the scan frequency corresponding to the analog signal AC1, so that the time required for the short scan signal AC1 to be scanned, # this technology is also used for other scans. Signals AC2, AC3 and ΑΓ4 port and AC 4' and their descriptions are the same as for scanning signal A C1. In the third embodiment, the design of the first method is the same as that of the first example, but the frequency of the scanning nickname AC1 is only selected to be a 71 冤 value II with the smallest fluctuation. The location of the p-position required for the location is further shortened, and the description of the scan signals AC2, AC3 and AC4 is the same. ', ... The specific timing mentioned above can be when the capacitor control (4) is installed, when the capacitive touch screen is turned on, and when the task of one of the capacitive touches is started. In addition, the switching speeds of these frequencies f丨, f2, and f are 9:•••^•••, and ^, and the frequencies fl, and f are at 200 kHz. ··· f. ···, and fn are all less than the total, in this way, because the current value and Μ can reflect the true convection value of the input =, so the final possible contact ρ input position error degree can be reduced . The method of reducing the position of the touch screen on the touch screen of the capacitive touch panel 12 200849072 has been described above, and is also arranged in a flow chart, as shown in the fifth figure. Referring to FIG. 5 , when performing the method for reducing the position of the touch screen on the touch screen of the capacitive touch panel of the present invention, firstly, respectively, an AC scan signal with a factory frequency at the four corners of the touch screen is provided; just). Then, the frequency of the corresponding alternating signal at the four corners is switched between the specific frequencies of the group by the county speed (S502). Thereafter, the touch screen is respectively swept to the corresponding scan signal, and the current value (10) 3) corresponding to the (four) constant frequency at the four corners is respectively sensed. Then, the eight jobs receive the current values corresponding to the specific frequency groups at the four corners, and select the selected frequency according to a noise removal procedure for the corresponding specific frequency group of the = (S504). The enemy, the sub-division is calculated as the corresponding frequency vs. the flow value to obtain a final electric 〇 5). ... coordinates (S5G7). In the preferred embodiment of the method (as shown in Figure 5A), the w-threshold is corresponding to the four corners. In the specific frequency group, the current value corresponding to the current value has a large fluctuation, the frequency (8) ιυ; the shirt (four) Γ & material - or more than the data to be excluded] filter out the specific frequency group corresponding to the four corners to be filtered, In addition to the frequency, in the 兮 ☆, or for the addition of the selected frequency umbrella of the group 鄹 S505 in the method of the rate corresponding to the current value of the step (not shown in the preferred embodiment of the person (such as the first The procedure shown in Figure 5B includes the following steps: 八 2 I ± °Hai noise filter to determine the surrounding environment: the four corners caused by - or more noise frequencies, the sense of borrowing = (4) the frequency formed in the fixed frequency group The corner, the corresponding special coffee pot; and the frequency corresponding to the specific frequency=method or multi-noise frequency corresponding to the four-dimensional drop, " ',,,,, and the same as the one sheep The selected frequency of the group and the specific frequency of the group 13 200849072 (S522). In addition, the step of the current value of the step s5〇5 (not shown and selected The frequency in the fixed frequency corresponds to the execution. The exclusion procedure is only in the third embodiment of the method (such as the fifth octet, the corresponding 筇I ^ no at the corner) The value of the fluctuation value of the current value formed by the frequency of the four calls and the frequency of the i: respectively = most = dynamic: the frequency of the corresponding current amount in the specific frequency group corresponding to the corner is taken as the frequency The group _ = sheep (S532) is added with the minimum current fluctuation S5 〇 5 respectively. In addition, the steps
,,0 + 7之頻率對應之電流值的i軍管牛W (未顯示），其令該雜訊遽除程序僅於一特定時機被執行 = Γ第六圖介紹本發明之降低電容式觸控面板之觸 ^幕上觸點位置的裝置，其並可作為上述之方法被執行的平, the frequency of the current value corresponding to the frequency of 0 + 7 (not shown), which causes the noise removal procedure to be executed only at a specific timing = Γ sixth figure describes the reduced capacitive touch of the present invention a device for touching the position of the on-screen contact of the panel, which can be implemented as a flat method as described above
'V 請參閱第六圖’本發明之降低電容式觸控面板之觸控榮幕上 觸點位置的裝置6G包含—訊號提供單元61、-頻率切換單元 62、-電壓驅動及電流感測單元63、_有效頻率選定單元料、 一有效電流值選取單元65&一位置座標計算單元％。 該訊號提供單元61係用以分別提供該觸控瑩幕之四角落處 以一具一頻率之交流掃描訊號。 該頻率切換單元62係用以分別快速切換該四角落處之對應 掃描訊號的頻率於一組特定頻率之間。 該電壓驅動及電流感測單元63係用以分別驅動該觸控螢幕 以η玄對應知描訊號，並用以分別感測該四角落處之對應組特定領 率的電流值。 ' 該有效頻率選定單元64用以分別接收該四角落處之對應特 14 200849072 頻率組依據 定頻率組的電流值’並分別對該四角落處之對應特定 一雜矾濾除程序選出一組選定頻率。 流值選取單元65係用以分別接收該四角落處之對 應特疋頻率組的電流值，並分別自該四角落處之對應特定頻率组 =電流值的每-者根據—特定處理方式選取—電流值，以作為一 最終電流值。 …、該位f座標計算單元66制以㈣該四角落處對應之最終 電流值計算該觸點輸入在該觸控螢幕上的座標。 藉由使用本&明之裝置及方法，電容式觸控面板之觸控榮幕 上的觸點輸人雜訊及周圍環境雜訊效應確實被降低，故觸點輸入 的判斷正雜被提高，足以改m技術的缺點。 本發明已藉由特定實_說明如±，熟習該項技術者可藉由 該等實施例之原理而推料其它可能實施例，如此推衍出之^施 例皆屬於本發明的精神範圍，故本發明之實際範圍當由後附之申 請專利範圍定義之。 【圖式簡單說明】 本發明之較佳貫施例的説明係透過下列圖式而為，其中· 第一圖為電容式觸控螢幕之一傳統觸點位置判定方法的說 明示意圖； 第二圖為本發明之電容式觸控螢幕之觸點位置判定原理的 基本說明示意圖； 第三圖為本發明之電容式觸控螢幕之觸點位置判定原理之 第一實施例的說明示意圖， 15 200849072 第四圖為本發明之電容式觸控勞幕之觸點位置判定原理之 第二及三實施例的說明示意圖； 第五圖為本發明之電容式觸控螢幕之觸點位置判定方法的 基本流程圖； 第五A圖至第五C圖為第 乐五圖所不方法之較佳實施例流程 圖；及 第六圖為本發明之電容式觸 、觸控邊幕之觸點位置判定裝置的 方塊圖。'V Please refer to the sixth figure'. The device 6G of the contact position on the touch screen of the reduced capacitive touch panel of the present invention comprises a signal providing unit 61, a frequency switching unit 62, a voltage driving and a current sensing unit. 63, _ effective frequency selected unit material, an effective current value selecting unit 65 & a position coordinate calculating unit %. The signal providing unit 61 is configured to respectively provide an alternating current scanning signal at a corner of the touch screen. The frequency switching unit 62 is configured to quickly switch the frequency of the corresponding scanning signal at the four corners between a specific set of frequencies. The voltage driving and current sensing unit 63 is configured to respectively drive the touch screen to form a signal corresponding to the corresponding display group, and to respectively sense the current value of the corresponding group specificity at the four corners. The effective frequency selecting unit 64 is configured to respectively receive the corresponding current value of the frequency group according to the fixed frequency group at the four corners of the four corners, and respectively select a set of selected ones of the corresponding one of the four corners. frequency. The stream value selecting unit 65 is configured to respectively receive current values of the corresponding characteristic frequency groups at the four corners, and respectively select from each of the corresponding specific frequency groups=current values at the four corners according to the specific processing manner— The current value is taken as a final current value. ..., the bit f coordinate calculation unit 66 calculates the coordinates of the contact input on the touch screen by (4) the final current value corresponding to the four corners. By using the device and method of the present invention, the contact input noise and the surrounding noise effect on the touch screen of the capacitive touch panel are indeed reduced, so the judgment of the contact input is improved. Sufficient to change the m technology. The present invention has been described by way of example only, and those skilled in the art can devise other possible embodiments by the principles of the embodiments, and the embodiments thus derived are all within the spirit of the invention. Therefore, the actual scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS The description of the preferred embodiment of the present invention is made by the following drawings, wherein: the first figure is a schematic diagram of a conventional contact position determining method of a capacitive touch screen; The basic schematic diagram of the principle of determining the position of the contact position of the capacitive touch screen of the present invention; the third figure is a schematic diagram of the first embodiment of the principle of determining the position of the contact position of the capacitive touch screen of the present invention, 15 200849072 The fourth figure is a schematic diagram of the second and third embodiments of the contact position determining principle of the capacitive touch screen of the present invention; the fifth figure is the basic flow of the method for determining the contact position of the capacitive touch screen of the present invention. 5A to 5C are flowcharts of a preferred embodiment of the method of the fifth embodiment of the present invention; and the sixth diagram is a contact position determining device for the capacitive touch and touch side curtain of the present invention. Block diagram.
【主要元件符號說明】 10電容式觸控面板 20電谷式觸控面板 S501 步驟 501 S503 步驟 503 S505 步驟 505 S511 步驟 51.1 S521 步驟 521 S531 步驟 531 60決定觸點位置之装置 62 頻率切換單元 64雜訊頻率除單元 66位置座標計算單元 11 觸控螢幕 21 觸控螢幕 S502 步驟 502 S504 步驟 504 S506 步驟 506 S512 步驟 512 S522 步驟 522 S532 步驟 532 61 訊號提供單元 63 電壓驅動及電流感測單元 65 有效電流值選取單元 16[Major component symbol description] 10 capacitive touch panel 20 electric valley touch panel S501 Step 501 S503 Step 503 S505 Step 505 S511 Step 51.1 S521 Step 521 S531 Step 531 60 Device for determining the position of the contact 62 Frequency switching unit 64 Frequency dividing unit 66 position coordinate calculating unit 11 touch screen 21 touch screen S502 step 502 S504 step 504 S506 step 506 S512 step 512 S522 step 522 S532 step 532 61 signal providing unit 63 voltage driving and current sensing unit 65 effective current Value selection unit 16