TWI456472B - 電容式觸控面板感測系統之自動增益控制 - Google Patents

電容式觸控面板感測系統之自動增益控制 Download PDF

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TWI456472B
TWI456472B TW101116646A TW101116646A TWI456472B TW I456472 B TWI456472 B TW I456472B TW 101116646 A TW101116646 A TW 101116646A TW 101116646 A TW101116646 A TW 101116646A TW I456472 B TWI456472 B TW I456472B
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conductive
circuit
touch panel
output signals
multiplier
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TW101116646A
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TW201248483A (en
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Kenneth Crandall
Michael Brosnan
Jeffrey Stone
Thomas Murphy
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Pixart Imaging Inc
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/002—Control of digital or coded signals
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3089—Control of digital or coded signals

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)
  • Electronic Switches (AREA)
  • User Interface Of Digital Computer (AREA)

Claims (17)

  1. 一種電容式觸控面板系統，包含：一觸控面板，包含複數個第一導電性驅動電極以及複數個第二導電性感測電極，該等第一導電性驅動電極排列成複數個列或行，該等第二導電性感測電極則相對於該第一導電性驅動電極之該等列或行以一角度排列成複數個列或行，在該等第一導電性驅動電極電極與該等第二電極相交而形成的複數個個別的單元(cell)之位置處，存在複數個互電容(mutual capacitance)於該等第一導電性驅動電極與該等第二導電性感測電極之間，當有一使用者之至少一手指或觸碰裝置靠近時，該等互電容發生變化；一驅動電路，可操作地連接至該等第一導電性驅動電極；一感測電路，可操作地連接至該等第二導電性感測電極，並用以自該等第二導電性感測電極感測對應於該等個別的單元之複數個輸入訊號，以及一控制器，可操作地連接至該等第一導電性驅動電極及該等第二導電性感測電極，該控制器包含一中央處理裝置(central processing unit；CPU)及一自動位準控制(automatic level control；ALC)電路，該自動位準控制電路包含：至少一倍頻器及降頻器電路(scaler and decimator circuit)，用以接收對應於該等個別的單元之訊號，並提供對應於該等個別的單元之倍頻及降頻後之輸出訊號；一乘法器電路，可操作地連接至該倍頻器及降頻器電路，並用以自該倍頻器及降頻器電路接收該等倍頻及降頻 後之輸出訊號，並更將該等倍頻及降頻後之輸出訊號乘以一增益因數，以提供複數個乘法器輸出訊號；一第一減法器電路，可操作地連接至該乘法器電路，並用以自該乘法器電路接收該等乘法器輸出訊號，並且將一預定設定點值減去該等乘法器輸出訊號，以提供複數個誤差輸出訊號；一自動位準控制回路濾波器電路，可操作地連接至該中央處理裝置及該乘法器電路，並用以根據該等誤差輸出訊號計算複數個更新的增益因數，以及提供該等更新的增益因數至該乘法器電路；以及一第二減法器電路，用以將一期望的設定點值減去該等乘法器輸出訊號，並提供對應之複數個最終輸出訊號至該中央處理裝置；其中該中央處理裝置用以根據對應於該使用者之該至少一手指或觸碰裝置之位置之該等最終輸出訊號，計算一觸碰位置資料。
  2. 如請求項1所述之電容式觸控面板系統，其中該中央處理裝置更用以提供該觸碰位置資料至一主機控制器。
  3. 如請求項1所述之電容式觸控面板系統，其中該ALC控制回路濾波器電路包含一移位暫存器及一積分器。
  4. 如請求項1所述之電容式觸控面板系統，其中該ALC控制回路濾波器電路更用以提供一增益因數，且回饋該增益因數至該乘法器電路，以最小化該等誤差輸出訊號。
  5. 如請求項1所述之電容式觸控面板系統，其中該控制器用以 於該電容式觸控面板系統未偵測到觸碰時，使該ALC控制回路濾波器電路具有一短時間常數。
  6. 如請求項1所述之電容式觸控面板系統，其中該控制器用以於該電容式觸控面板系統偵測到一觸碰時，使該ALC控制回路濾波器電路具有一長時間常數。
  7. 如請求項6所述之電容式觸控面板系統，其中觸碰偵測係由該等個別單元之互電容降至一預定臨界值以下來決定。
  8. 如請求項7所述之電容式觸控面板系統，更包含一系統韌體，該系統韌體用以決定觸碰偵測。
  9. 如請求項1所述之電容式觸控面板系統，其中對於該觸控面板之複數個別單元之每一者，該控制器皆包含一ALC電路。
  10. 如請求項1所述之電容式觸控面板系統，其中各該ALC電路使用相同之預定設定點值。
  11. 如請求項1所述之電容式觸控面板系統，其中對應於該等個別單元之該等最終輸出訊號係為數位化的已濾波輸出訊號。
  12. 如請求項1所述之電容式觸控面板系統，其中該等數位化的已濾波輸出訊號係約5000至50000間之數位值。
  13. 一種於一電容式觸控面板系統上偵測觸碰之方法，該系統包含：一觸控面板，包含複數個第一導電性驅動電極以及複數個第二導電性感測電極，該等第一導電性驅動電極排列成複數個列或行，該等第二導電性感測電極則相對於該等第一導電性驅動電極之該等列或行以一角度排列成複數個列或行，在該等第一導電性驅動電極與該等第二導電性感測電極相交而形成的複數個別的單元之位置處，存在複數個互電容 (mutual capacitance)於該等第一導電性驅動電極與該等第二導電性感測電極之間，當有一使用者之至少一手指或觸碰裝置靠近時，該等互電容發生變化；一驅動電路，可操作地連接至該等第一導電性驅動電極；一感測電路，可操作地連接至該等第二導電性感測電極，並用以自該等第二導電性感測電極感測對應於該等個別的單元之複數個輸入訊號；以及一控制器，可操作地連接至該等第一導電性驅動電極及該第二導電性感測電極，該控制器包含一中央處理裝置(CPU)及一自動位準控制(automatic level control；ALC)電路，該方法包含：倍頻及降頻對應於該等個別的單元之訊號，以提供對應於該等個別的單元之倍頻及降頻後之輸出訊號；將該等倍頻及降頻後之輸出訊號乘以一增益因數，以提供複數個乘法器輸出訊號；將一預定設定點值減去該等乘法器輸出訊號，以提供複數個誤差輸出訊號；根據該等誤差輸出訊號計算複數個更新的增益因數；將一所期望設定點值減去該等乘法器輸出訊號並提供對應之複數個最終輸出訊號；以及根據對應於該使用者之該至少一手指或觸碰裝置之位置之該等最終輸出訊號，來計算一觸碰位置資料。
  14. 如請求項13所述之方法，更包含提供觸碰位置資料至一主機控制器。
  15. 如請求項13所述之方法，更包含計算及提供複數個回饋增益 因數，以最小化該等誤差輸出訊號。
  16. 如請求項13所述之方法，更包含於個別單元之電容降至一預定臨限值以下時，偵測觸碰。
  17. 如請求項13所述之方法，更包含採用一系統韌體來偵測觸碰。
TW101116646A 2011-05-16 2012-05-10 電容式觸控面板感測系統之自動增益控制 TWI456472B (zh)

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CN102789345B (zh) 2015-05-13
CN102789345A (zh) 2012-11-21
TW201248483A (en) 2012-12-01
US20120293446A1 (en) 2012-11-22
US8487893B2 (en) 2013-07-16

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