JP2005049978A - Resistance film type touch panel - Google Patents

Resistance film type touch panel Download PDF

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Publication number
JP2005049978A
JP2005049978A JP2003203730A JP2003203730A JP2005049978A JP 2005049978 A JP2005049978 A JP 2005049978A JP 2003203730 A JP2003203730 A JP 2003203730A JP 2003203730 A JP2003203730 A JP 2003203730A JP 2005049978 A JP2005049978 A JP 2005049978A
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Japan
Prior art keywords
voltage
panel
electrode
ito film
touch panel
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JP2003203730A
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Japanese (ja)
Inventor
Naoki Ito
直樹 伊藤
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Toshiba TEC Corp
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Toshiba TEC Corp
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Priority to JP2003203730A priority Critical patent/JP2005049978A/en
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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
    • G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04104—Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a touch panel for detecting the positions of a plurality of points that are pressed simultaneously. <P>SOLUTION: First and second panels 2, 3 that face each other are provided. The first panel 2 has a single resistive film 5, where a pair of electrodes 6, 7 is provided. The second panel 3 has a plurality of resistive films 9a, 9b that face the resistive film 5 of the first panel 2. A pair of electrodes 10a, 11a, and a pair of electrodes 10b, 11b are provided so that they orthogonally cross the pair of electrodes 6, 7 in the resistive films 9a, 9b. Accordingly, a plurality of mutually independent press input regions (first and second regions A, B) are formed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、抵抗膜式タッチパネルに関する。
【０００２】
【従来の技術】
従来、例えば液晶ディスプレイなどの画像表示装置の表示画面上にタッチパネルを重ねて取り付けて、タッチパネルへの押圧操作により表示画面に表示されたボタンなどの選択を行う画面入力装置がある。
【０００３】
タッチパネルには、抵抗膜式（例えば、特許文献１参照）や光学式などがあり、このうち、抵抗膜式のタッチパネルは、構造が単純である、低コストであるなどの利点により広く普及している。
【０００４】
図９は従来の抵抗膜式タッチパネルを示す縦断側面図、図１０は抵抗膜式タッチパネルを示す斜視図である。図９に示すように、従来の抵抗膜式タッチパネル１００は、対向配置された一対のパネル１０１，１０２（下パネル１０１、上パネル１０２）を備えている。図９及び図１０に示すように、下パネル１０１は、ガラス板１０３の上面に透明な抵抗膜であるＩＴＯ膜１０４が設けられ、そのＩＴＯ膜１０４のＸ方向の両端に電極１０５，１０６が設けられて構成されている。上パネル１０２は、可撓性のあるＰＥＴ板１０７の下面に透明な抵抗膜であるＩＴＯ膜１０８が設けられ、そのＩＴＯ膜のＹ方向の両端に電極１０９，１１０が設けられて構成されている。
【０００５】
これらのパネル１０１，１０２は、スペーサ１１１を介して対向配置されており、ＩＴＯ膜１０４とＩＴＯ膜１０８との間には微小ギャップが形成されており、非押圧時にはＩＴＯ膜１０４，１０８同士は互いに離間している。また、下パネル１０１と上パネル１０２との間には、非押圧時のＩＴＯ膜１０４，１０８同士の接触を防止するドットスペーサ１１２が設けられている。
【０００６】
このような構造では、上パネル１０２のある点が押されると、ＰＥＴ板１０７が屈曲して、その押圧点で上側のＩＴＯ膜１０８が下側のＩＴＯ膜１０４に接触する。このとき、上パネル１０２の電極１０９，１１０間に電源を接続して所定の電圧を印加する。これにより、上側のＩＴＯ膜１０８での押圧点のＹ方向位置に応じて分圧した電圧が下側のＩＴＯ膜１０４に伝わり電極１０６を介して検出される。この電圧に基づいてＹ座標が求められる。次に、下パネル１０１の電極１０５，１０６間に電源を接続して所定の電圧を印加する。これにより、下側のＩＴＯ膜１０４での押圧点のＸ方向位置に応じて分圧した電圧が上側のＩＴＯ膜１０８に伝わり電極１１０を介して検出される。この電圧に基づいてＸ座標が求められる。このようなＸ座標、Ｙ座標の検出のための処理は、押圧動作に比べて非常に短時間で行われる。このような処理を繰り返し行うことにより、常に座標の検出が可能となる。
【０００７】
【特許文献１】
特開平１１−３０５９４１号公報
【０００８】
【発明が解決しようとする課題】
しかしながら、このような従来の抵抗膜式タッチパネル１００で２点が同時に押下された場合には、２つの押圧点の電圧値の中間の電圧値が検出され、これにより、押圧された２つの点の中点の座標が押下点として認識されてしまい、同時に押下された２点の座標を検出することができないという問題がある。
【０００９】
本発明の目的は、同時に押された複数の点の位置を検出できるタッチパネルを得ることである。
【００１０】
【課題を解決するための手段】
本発明は、第１のパネルと第２のパネルとを備える。第１のパネルは、第１の抵抗膜と第１の抵抗膜において第１の抵抗膜の第１の方向に間隔をあけて対向配置され第１の抵抗膜に接触している一対の第１の電極部とを有する。第２のパネルは、第１の抵抗膜に間隔をあけて対向配置され第１の方向に並べて配置された複数の第２の抵抗膜とこれらの第２の抵抗膜毎に第１の方向に直交する第２の方向に間隔をあけて一対ずつ対向配置され対応する第２の抵抗膜に接触している複数対の第２の電極部とを有する。
【００１１】
【発明の実施の形態】
本発明の一実施の形態を図１ないし図８に基づいて説明する。本実施の形態は、アナログ式の抵抗膜式タッチパネルへの本発明の適用例である。ここで、図１は本実施の形態の抵抗膜式タッチパネルを示す縦断側面図、図２は抵抗膜式タッチパネルを示す模式図である。
【００１２】
図１に示すように、抵抗膜式タッチパネル１は、第１のパネルである下パネル２と、第２のパネルである上パネル３とが対向配置されて構成されている。下パネル２は、透明なガラス板４を有し、このガラス板４の上面には透明な抵抗膜であるＩＴＯ（Ｉｎｄｉｕｍ Ｔｉｎ Ｏｘｉｄｅ）膜５が設けられている。図２に示すように、ＩＴＯ膜５における第１の方向であるＸ方向の両端には、第１の電極部である一対の電極６，７がＩＴＯ膜５に接触して設けられている。
【００１３】
上パネル３は、図１に示すように、可撓性のある透明なＰＥＴ（Ｐｏｌｙｅｔｈｙｌｅｎｅ Ｔｅｒｅｐｈｔｈａｌａｔｅ）板８を有している。このＰＥＴ板８の下面には透明な抵抗膜である２つのＩＴＯ膜９ａ，９ｂがＸ方向に間隔をあけて並べて設けられている。これらの２つのＩＴＯ膜９ａ，９ｂにより上パネル３の押圧入力有効領域として第１の領域Ａと第２の領域Ｂとが互いに独立して形成される。つまり、押圧入力有効領域が２つに分割されて設けられている。ここで、これらのＩＴＯ膜９ａ，９ｂ及び下パネル２のＩＴＯ膜５は蒸着によりＰＥＴ板８及びガラス板４に形成されている。一方のＩＴＯ膜９ａには、図２に示すように、ＩＴＯ膜９ａの面方向においてＸ方向に直交する方向であり第２の方向であるＹ方向の両端に第２の電極部である一対の電極１０ａ，１１ａがＩＴＯ膜９ａに接触して設けられ、同様に、他方のＩＴＯ膜９ｂには、Ｙ方向の両端に第２の電極部である一対の電極１０ｂ，１１ｂがＩＴＯ膜９ｂに接触して設けられている。
【００１４】
これらの下パネル２及び上パネル３は、それらのパネル２，３の周縁に位置するスペーサ１２を介して対向配置されており、ＩＴＯ膜５とＩＴＯ膜９ａ，９ｂとの間には微小ギャップが形成されており、非押圧時にはＩＴＯ膜５とＩＴＯ膜９ａ，９ｂとは互いに離間している。また、下パネル２の上パネル３に対向する側には、複数の半円状のドットスペーサ１３が設けられている。これらのドットスペーサ１３は、非押圧時に下パネル２のＩＴＯ膜５と上パネル３のＩＴＯ膜９ａ，９ｂとの接触を防止するものである。そして、ＰＥＴ板８が押圧されることによりＰＥＴ板８が湾曲し、その押圧された部位のＩＴＯ膜９ａ，９ｂがＩＴＯ膜５に接触する。
【００１５】
図２に示すように、下パネル２の一方の電極６は、スイッチＳＷ１を介して電源１４のプラス側に接続され、他方の電極７はスイッチＳＷ２を介して電源１４のマイナス側に接続されるとともにスイッチＳＷ３を介して電圧検出器１５に接続される。本実施の形態の電源１４の電圧は５Ｖに設定されている。
【００１６】
上パネル３の各ＩＴＯ膜９ａ，９ｂの一方の電極１０ａ，１０ｂは、それぞれスイッチＳＷ４，ＳＷ５を介して電源１４のプラス側に接続され、他方の電極１１ａ，１１ｂはそれぞれスイッチＳＷ６，ＳＷ７を介して電源１４のマイナス側に接続されるとともにスイッチＳＷ８，ＳＷ９を介して電圧検出器１６，１７に接続される。
【００１７】
図３は抵抗膜式タッチパネル１の電気的接続を示すブロック図である。図３に示すように、抵抗膜式タッチパネル１は、マイクロコンピュータ（以下、マイコン２０という。）２０を備えており、このマイコン２０が各部を駆動制御する。マイコン２０は、各部を集中的に制御するＣＰＵ（Ｃｅｎｔｒａｌ Ｐｒｏｃｅｓｓｉｎｇ Ｕｎｉｔ）２１にバスライン２２を介して、コンピュータプログラム等の固定的データを予め記憶するＲＯＭ（Ｒｅａｄ Ｏｎｌｙ Ｍｅｍｏｒｙ）２３と、各種データを書き換え自在に記憶するワークエリアとして機能するＲＡＭ（Ｒａｎｄｏｍ Ａｃｃｅｓｓ Ｍｅｍｏｒｙ）２４とが接続されて構成されている。
【００１８】
このマイコン２０には、バスライン２２を介してスイッチＳＷ１〜ＳＷ９、電圧検出器１５〜１７が接続されている。これにより、マイコン２０によるスイッチＳＷ１〜ＳＷ９の制御が可能となる。また、電圧検出器１５〜１７は、検出した電圧値をマイコン２０に出力する。
【００１９】
次に、ＣＰＵ２１がコンピュータプログラムに従って実行する座標検出処理を図４ないし図７に基づいて説明する。ここで、図４は座標検出処理の流れを示すフローチャート、図５は第１の領域ＡのＹ座標を検出するときの抵抗膜式タッチパネル１を示す模式図、図６は第２の領域ＢのＹ座標を検出するときの抵抗膜式タッチパネル１を示す模式図、図７は第１及び第２の領域Ａ，ＢのＸ座標を検出するときの抵抗膜式タッチパネル１を示す模式図である。
【００２０】
ここで、この座標検出処理の際には、ＲＡＭ２４に、第１の領域Ａの押圧点（入力点）のＸＹ座標（Ｘ１，Ｙ１）、第２の領域Ｂの押圧点（入力点）のＸＹ座標（Ｘ２，Ｙ２）を格納する座標格納テーブル（図示せず）が設けられる。
【００２１】
図４に示すように、座標検出処理では、まず、ＲＡＭ２４に形成された座標格納テーブルに無効データを格納する（ステップＳ１）。
【００２２】
次に、スイッチＳＷ５，ＳＷ７，ＳＷ９を開き上パネル３のＩＴＯ膜９ｂ側（第２の領域Ｂ側）の電極１０ｂ，１１ｂを電気的に切断されている状態であるハイインピーダンスにし（ステップＳ２、図５参照）、スイッチＳＷ１，ＳＷ２を開きスイッチＳＷ３を閉じて、パネル２のＩＴＯ膜５の電極６をハイインピーダンスにするとともに電極７を電圧測定モードにする（ステップＳ３、図５参照）。そして、スイッチＳＷ４，ＳＷ６を閉じるとともにスイッチＳＷ８を開き、上パネル３のＩＴＯ膜９ａの電極１０ａに５Ｖ、電極１１ａに０Ｖの電圧を印加する（ステップＳ４、図５参照）。これによりＩＴＯ膜９ａの電極１０ａ，１１ａ間に電流が流れ、第１の領域ＡのＹ座標の検出が可能な状態となる。
【００２３】
次に、第１の領域Ａの上パネル３が押下されているか否かを判断する（ステップＳ５）。この判断は、下パネル２の電極７の電圧値に基づいて行われる。即ち、電圧検出器１５が電圧を検出した場合（電圧が０でない場合）には、第１の領域Ａの上パネル３が押下されていると判断し（ステップＳ５のＹ）、電圧検出器１５が電圧を検出しない場合（電圧が０の場合）には、第１の領域Ａの上パネル３が押下されていないと判断する（ステップＳ５のＮ）。
【００２４】
第１の領域Ａの上パネル３が押下されていると判断した場合には（ステップＳ５のＹ）、電圧検出器１５が検出した下パネル２の電極７の電圧値をＹ座標に変換して座標格納テーブルのＹ１に格納する（ステップＳ６）。ここで、座標の検出原理を説明する。ＩＴＯ膜９ａにおける第１の領域Ａの電圧は、電極１０ａに近いほど５Ｖに近く、電極１１ａに近いほど０Ｖに近く、電極１０ａから電極１１ａに向かって線形的に変化している。よって、ＩＴＯ膜９ａにおける第１の領域Ａでの電圧とＹ座標位置との関係は、電極１０ａに近い位置（Ｙ座標値が小さい）ほど電圧が高く、電極１１ａに近い位置（Ｙ座標値が大きい）ほど電圧が低いという関係となっている。そして、第１の領域Ａのある点が押圧されることにより、上パネル３のＩＴＯ膜９ａが下パネル２のＩＴＯ膜５に接触すると、その押圧点でのＩＴＯ膜９ａの電圧が下パネル２の電極７に接続された電圧検出器１５によって検出され、これにより、この電圧に基づいてＹ座標が求められる。
【００２５】
このとき、上パネル３の第２の領域Ｂのある点が押下され第２の領域ＢのＩＴＯ膜９ｂが下パネルのＩＴＯ膜５に接触している場合でも、第２の領域ＢのＩＴＯ膜９ｂには電圧が印加されておらず電気的に切断されている状態なので、この押下が第１の領域ＡのＹ座標検出に影響することはない。
【００２６】
一方、ステップＳ５において、電圧検出器１５が検出した電圧が０Ｖであり、第１の領域Ａの上パネル３が押下されていないと判断した場合には（ステップＳ５のＮ）、ステップＳ７に進む。
【００２７】
次に、スイッチＳＷ４，ＳＷ６，ＳＷ８を開き上パネル３のＩＴＯ膜９ａ側（第１の領域Ａ側）の電極１０ａ，１１ａをハイインピーダンスにし（ステップＳ７、図６参照）、スイッチＳＷ１，ＳＷ２を開きスイッチＳＷ３を閉じて、パネル２のＩＴＯ膜５の電極６をハイインピーダンスにするとともに電極７を電圧測定モードにする（ステップＳ８、図６参照）。そして、スイッチＳＷ５，ＳＷ７を閉じるとともにスイッチＳＷ９を開き、上パネル３のＩＴＯ膜９ｂの電極１０ｂに５Ｖ、電極１１ｂに０Ｖの電圧を印加する（ステップＳ９、図６参照）。これによりＩＴＯ膜９ｂの電極１０ｂ，１１ｂ間に電流が流れ、第２の領域ＢのＹ座標の検出が可能な状態となる。
【００２８】
次に、第２の領域Ｂの上パネル３が押下されているか否かを判断する（ステップＳ１０）。この判断は、ステップＳ５と同様に、下パネル２の電極７の電圧値に基づいて行われる。即ち、電圧検出器１５が電圧を検出した場合（電圧が０でない場合）には、第２の領域Ｂの上パネル３が押下されたと判断し（ステップＳ１０のＹ）、電圧検出器１５が電圧を検出しない場合（電圧が０の場合）には、第２の領域Ｂの上パネル３が押下されていないと判断する（ステップＳ１０のＮ）。
【００２９】
第２の領域Ｂの上パネル３が押下されたと判断した場合には（ステップＳ１０のＹ）、電圧検出器１５が検出した下パネル２の電極７の電圧値をＹ座標に変換して座標格納テーブルのＹ２に格納する（ステップＳ６）。座標の検出原理は上述したものと同様である。
【００３０】
このとき、上パネル３の第１の領域Ａのある点が押下され第１の領域ＡのＩＴＯ膜９ａが下パネルのＩＴＯ膜５に接触している場合でも、第１の領域ＡのＩＴＯ膜９ａには電圧が印加されておらず電気的に切断されている状態なので、この押下が第２の領域ＢのＹ座標検出に影響することはない。
【００３１】
一方、ステップＳ１０において、電圧検出器１５が検出した電圧が０Ｖであり、第２の領域Ｂの上パネル３が押下されていないと判断した場合には（ステップＳ１０のＮ）、ステップＳ１２に進む。
【００３２】
次に、スイッチＳＷ４，ＳＷ５を開いて上パネル３の電極１０ａ，１０ｂをハイインピーダンスにし、スイッチＳＷ６，ＳＷ７を開きスイッチＳＷ８，９を閉じて上パネルの電極１１ａ，１１ｂを電圧測定モードにする（ステップＳ１２、図７参照）。そして、スイッチＳＷ１，ＳＷ２を閉じるとともにスイッチＳＷ３を開き、下パネル２の電極６に５Ｖ、電極７に０Ｖの電圧を印加する（ステップＳ１３、図７参照）。これによりＩＴＯ膜５の電極６，７間に電流が流れ、第１及び第２の領域Ａ，ＢのＸ座標の検出が可能な状態となる。
【００３３】
次に、第１の領域Ａの上パネル３が押下されているか否かを判断する（ステップＳ１４）。この判断は、上パネル３の電極１１ａの電圧値に基づいて行われる。即ち、電圧検出器１６が電圧を検出した場合（電圧が０でない場合）には、第１の領域Ａの上パネル３が押下されていると判断し（ステップＳ１４のＹ）、電圧検出器１６が電圧を検出しない場合（電圧が０の場合）には、第１の領域Ａの上パネル３が押下されていないと判断する（ステップＳ１４のＮ）。
【００３４】
第１の領域Ａの上パネル３が押下されていると判断した場合には（ステップＳ１４のＹ）、電圧検出器１６が検出した電極１１ａの電圧値をＸ座標に変換して座標格納テーブルのＸ１に格納する（ステップＳ１５）。ここで、座標の検出原理を説明する。ＩＴＯ膜５における電圧は、電極６に近いほど５Ｖに近く、電極７に近いほど０Ｖに近く、電極６から電極７に向かって線形的に変化している。よって、ＩＴＯ膜５における電圧とＸ座標位置との関係は、電極６に近い（Ｘ座標値が小さい）ほど電圧が高く、電極７に近い（Ｘ座標値が大きい）ほど電圧が低いという関係となっている。そして、第１の領域Ａのある点が押圧されることにより、上パネル３のＩＴＯ膜９ａが下パネル２のＩＴＯ膜５に接触すると、その押圧点でのＩＴＯ膜５の電圧が上パネル３の電極１１ａに接続された電圧検出器１６によって検出され、これにより、この電圧に基づいてＸ座標が求められる。
【００３５】
一方、ステップＳ１４において、電圧検出器１６が検出した電圧が０Ｖであり、第１の領域Ａの上パネル３が押下されていないと判断した場合には（ステップＳ１４のＮ）、ステップＳ１６に進む。
【００３６】
次に、第２の領域Ｂの上パネル３が押下されているか否かを判断する（ステップＳ１６）。この判断は、上パネル３の電極１１ｂの電圧値に基づいて行われる。即ち、電圧検出器１７が電圧を検出した場合（電圧が０でない場合）には、第２の領域Ｂの上パネル３が押下されていると判断し（ステップＳ１４のＹ）、電圧検出器１７が電圧を検出しない場合（電圧が０の場合）には、第２の領域Ｂの上パネル３が押下されていないと判断する（ステップＳ１６のＮ）。
【００３７】
第２の領域Ｂの上パネル３が押下されていると判断した場合には（ステップＳ１４のＹ）、電圧検出器１７が検出した電極１１ｂの電圧値をＸ座標に変換して座標格納テーブルのＸ２に格納する（ステップＳ１７）。座標の検出原理は第１の領域Ａの場合と同様である。
【００３８】
なお、本実施の形態では、第１の領域ＡのＸ座標の検出処理と第２の領域ＢのＸ座標の検出処理とを時間的にずらした処理として説明したが、これらの処理を並行に行っても良い。このとき、電極１１ａ，１１ｂから電圧検出器１６，１７に流れる電流は非常に小さくそれらが干渉し合うことがないので、このような２つの電圧の同時測定においても、電圧検出器１６，１７の電圧測定が正確に行われる。
【００３９】
一方、ステップＳ１６において、電圧検出器１７が検出した電圧が０Ｖであり、第２の領域Ｂの上パネル３が押下されていないと判断した場合には（ステップＳ１６のＮ）、何もしない。
【００４０】
以上のようなステップＳ１からステップＳ１７の処理は、押圧動作に比べて非常に短時間で実行される。そして、この処理を繰り返し行うことにより、常に第１及び第２の領域Ａ，Ｂの座標の検出が可能となる。
【００４１】
このように本実施の形態では、上パネル３の押圧入力有効領域を第１の領域Ａと第２の領域Ｂとに２つに分けて、それらの領域Ａ，Ｂ毎に、１点の押圧点の座標を検出可能としたことにより、第１及び第２の領域Ａ，Ｂでそれぞれ同時に１点ずつ押下された場合でも、それらのＸＹ座標の位置を正確に検出することができる。これにより、２人のオペレータが使用領域を定めて操作することにより、同時に一つの抵抗膜式タッチパネルを２人で操作することができる。
【００４２】
ここで、第１の領域Ａと第２の領域Ｂとの間にはＩＴＯ膜が蒸着されていない部分が存在し、この部分での入力ができないという制約があるが、これは、この抵抗膜式タッチパネル１を装着する表示装置においてその入力できない部分にボタンを表示させないようなアプリケーションにすれば問題にはならない。
【００４３】
なお、本実施の形態では、押圧入力有効領域として２つ領域Ａ，Ｂを設けた例を説明したが、これに限るものではなく、複数であればよい。例えば、押圧入力有効領域を３つ設ける場合には、図８に示すように、上パネルに３つのＩＴＯ膜９ｃ，９ｄ，９ｅをＸ方向に並べて設け、それぞれに電極１０ｃ，１１ｃ、電極１０ｄ，１１ｄ、電極１０ｅ，１１ｅを設ければよい。
【００４４】
また、本実施の形態では、アナログ式の抵抗膜式タッチパネル１への適用例を説明したが、デジタル式の抵抗膜式タッチパネルへ本発明を適用してもよい。
【００４５】
【発明の効果】
本発明によれば、同時に押された複数の点の位置を検出できるタッチパネルを得ることができる。
【図面の簡単な説明】
【図１】本発明の一実施の形態の抵抗膜式タッチパネルを示す縦断側面図である。
【図２】抵抗膜式タッチパネルを示す模式図である。
【図３】抵抗膜式タッチパネルの電気的接続を示すブロック図である。
【図４】座標検出処理の流れを示すフローチャートである。
【図５】第１の領域のＹ座標を検出するときの抵抗膜式タッチパネルを示す模式図。
【図６】第２の領域のＹ座標を検出するときの抵抗膜式タッチパネルを示す模式図。
【図７】第１及び第２の領域のＸ座標を検出するときの抵抗膜式タッチパネルを示す模式図である。
【図８】３点押圧入力対応の抵抗膜式タッチパネルを示す模式図である。
【図９】従来の抵抗膜式タッチパネルを示す縦断側面図である。
【図１０】抵抗膜式タッチパネルを示す斜視図である。
【符号の説明】
１…抵抗膜式タッチパネル、２…下パネル（第１のパネル）、３…上パネル（第２のパネル）、５…ＩＴＯ膜（第１の抵抗膜）、６…電極（第１の電極部）、７…電極（第１の電極部）、９ａ〜９ｅ…ＩＴＯ膜（第２の抵抗膜）、１０ａ〜１０ｅ…電極（第２の電極部）、１１ａ〜１１ｅ…電極（第２の電極部）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resistive film type touch panel.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is a screen input device in which, for example, a touch panel is overlaid on a display screen of an image display device such as a liquid crystal display and a button displayed on the display screen is selected by a pressing operation on the touch panel.
[0003]
The touch panel includes a resistance film type (for example, refer to Patent Document 1) and an optical type. Among these, the resistance film type touch panel is widely spread due to advantages such as a simple structure and low cost. Yes.
[0004]
FIG. 9 is a longitudinal side view showing a conventional resistive touch panel, and FIG. 10 is a perspective view showing the resistive touch panel. As shown in FIG. 9, the conventional resistive touch panel 100 includes a pair of panels 101 and 102 (a lower panel 101 and an upper panel 102) arranged to face each other. As shown in FIGS. 9 and 10, the lower panel 101 is provided with an ITO film 104, which is a transparent resistance film, on the upper surface of a glass plate 103, and electrodes 105 and 106 are provided on both ends of the ITO film 104 in the X direction. Is configured. The upper panel 102 is configured such that an ITO film 108, which is a transparent resistance film, is provided on the lower surface of a flexible PET plate 107, and electrodes 109, 110 are provided on both ends of the ITO film in the Y direction. .
[0005]
These panels 101 and 102 are arranged to face each other via a spacer 111, and a minute gap is formed between the ITO film 104 and the ITO film 108. When not pressed, the ITO films 104 and 108 are mutually connected. It is separated. Further, a dot spacer 112 is provided between the lower panel 101 and the upper panel 102 to prevent the ITO films 104 and 108 from contacting each other when not pressed.
[0006]
In such a structure, when a certain point on the upper panel 102 is pressed, the PET plate 107 is bent, and the upper ITO film 108 contacts the lower ITO film 104 at the pressing point. At this time, a power source is connected between the electrodes 109 and 110 of the upper panel 102 to apply a predetermined voltage. As a result, a voltage divided according to the Y-direction position of the pressing point on the upper ITO film 108 is transmitted to the lower ITO film 104 and detected via the electrode 106. The Y coordinate is obtained based on this voltage. Next, a power source is connected between the electrodes 105 and 106 of the lower panel 101 to apply a predetermined voltage. As a result, the voltage divided according to the X-direction position of the pressing point on the lower ITO film 104 is transmitted to the upper ITO film 108 and detected via the electrode 110. The X coordinate is obtained based on this voltage. Such processing for detecting the X-coordinate and the Y-coordinate is performed in a very short time compared to the pressing operation. By repeatedly performing such processing, coordinates can always be detected.
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-305941
[Problems to be solved by the invention]
However, when two points are pressed simultaneously on such a conventional resistive touch panel 100, a voltage value intermediate between the voltage values of the two pressing points is detected, and thus the two pressed points are detected. There is a problem that the coordinates of the middle point are recognized as the pressed point, and the coordinates of the two points pressed at the same time cannot be detected.
[0009]
The objective of this invention is obtaining the touch panel which can detect the position of the several point pressed simultaneously.
[0010]
[Means for Solving the Problems]
The present invention includes a first panel and a second panel. The first panel is a pair of first resistors that are disposed opposite to each other in the first direction of the first resistance film between the first resistance film and the first resistance film, and are in contact with the first resistance film. Electrode part. The second panel has a plurality of second resistance films arranged opposite to each other with a spacing from the first resistance film and arranged in the first direction, and the second resistance films are arranged in the first direction for each of the second resistance films. And a plurality of pairs of second electrode portions that are arranged to face each other in a second direction orthogonal to each other and are in contact with the corresponding second resistance film.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. This embodiment is an application example of the present invention to an analog resistive touch panel. Here, FIG. 1 is a longitudinal side view showing the resistive film type touch panel of the present embodiment, and FIG. 2 is a schematic diagram showing the resistive film type touch panel.
[0012]
As shown in FIG. 1, the resistive touch panel 1 includes a lower panel 2 that is a first panel and an upper panel 3 that is a second panel. The lower panel 2 has a transparent glass plate 4, and an ITO (Indium Tin Oxide) film 5, which is a transparent resistance film, is provided on the upper surface of the glass plate 4. As shown in FIG. 2, a pair of electrodes 6, 7 that are first electrode portions are provided in contact with the ITO film 5 at both ends in the X direction, which is the first direction, in the ITO film 5.
[0013]
As shown in FIG. 1, the upper panel 3 includes a flexible transparent PET (Polyethylene Terephthalate) plate 8. On the lower surface of the PET plate 8, two ITO films 9a and 9b, which are transparent resistance films, are provided side by side in the X direction. By these two ITO films 9a and 9b, the first area A and the second area B are formed independently of each other as the effective pressing input area of the upper panel 3. That is, the effective press input area is divided into two. Here, the ITO films 9a and 9b and the ITO film 5 of the lower panel 2 are formed on the PET plate 8 and the glass plate 4 by vapor deposition. As shown in FIG. 2, the ITO film 9a has a pair of second electrode portions at both ends in the Y direction, which is a direction perpendicular to the X direction and the second direction in the surface direction of the ITO film 9a. The electrodes 10a and 11a are provided in contact with the ITO film 9a. Similarly, in the other ITO film 9b, a pair of electrodes 10b and 11b which are second electrode portions at both ends in the Y direction are in contact with the ITO film 9b. Is provided.
[0014]
The lower panel 2 and the upper panel 3 are disposed so as to face each other with spacers 12 positioned on the peripheral edges of the panels 2 and 3, and a small gap is formed between the ITO film 5 and the ITO films 9a and 9b. The ITO film 5 and the ITO films 9a and 9b are separated from each other when not pressed. A plurality of semicircular dot spacers 13 are provided on the side facing the upper panel 3 of the lower panel 2. These dot spacers 13 prevent contact between the ITO film 5 of the lower panel 2 and the ITO films 9a and 9b of the upper panel 3 when not pressed. Then, when the PET plate 8 is pressed, the PET plate 8 is curved, and the ITO films 9 a and 9 b at the pressed portions come into contact with the ITO film 5.
[0015]
As shown in FIG. 2, one electrode 6 of the lower panel 2 is connected to the positive side of the power source 14 via the switch SW1, and the other electrode 7 is connected to the negative side of the power source 14 via the switch SW2. At the same time, it is connected to the voltage detector 15 via the switch SW3. The voltage of the power supply 14 in this embodiment is set to 5V.
[0016]
One electrode 10a, 10b of each ITO film 9a, 9b of the upper panel 3 is connected to the positive side of the power source 14 via switches SW4, SW5, respectively, and the other electrode 11a, 11b is connected via switches SW6, SW7, respectively. Are connected to the negative side of the power source 14 and are connected to voltage detectors 16 and 17 via switches SW8 and SW9.
[0017]
FIG. 3 is a block diagram showing electrical connection of the resistive touch panel 1. As shown in FIG. 3, the resistive touch panel 1 includes a microcomputer (hereinafter referred to as a microcomputer 20) 20, and the microcomputer 20 drives and controls each unit. The microcomputer 20 rewrites various data with a ROM (Read Only Memory) 23 that pre-stores fixed data such as a computer program via a bus line 22 in a CPU (Central Processing Unit) 21 that controls each part centrally. A RAM (Random Access Memory) 24 that functions as a work area that can be freely stored is connected.
[0018]
The microcomputer 20 is connected to switches SW1 to SW9 and voltage detectors 15 to 17 through a bus line 22. Thereby, control of switch SW1-SW9 by the microcomputer 20 is attained. The voltage detectors 15 to 17 output the detected voltage value to the microcomputer 20.
[0019]
Next, the coordinate detection process which CPU21 performs according to a computer program is demonstrated based on FIG. 4 thru | or FIG. 4 is a flowchart showing the flow of the coordinate detection process, FIG. 5 is a schematic diagram showing the resistive touch panel 1 when detecting the Y coordinate of the first area A, and FIG. 7 is a schematic diagram showing the resistive touch panel 1 when detecting the Y coordinate, and FIG. 7 is a schematic diagram showing the resistive touch panel 1 when detecting the X coordinate of the first and second regions A and B. FIG.
[0020]
In this coordinate detection process, the XY coordinates (X1, Y1) of the pressing point (input point) of the first area A and the XY of the pressing point (input point) of the second area B are stored in the RAM 24. A coordinate storage table (not shown) for storing the coordinates (X2, Y2) is provided.
[0021]
As shown in FIG. 4, in the coordinate detection process, first, invalid data is stored in a coordinate storage table formed in the RAM 24 (step S1).
[0022]
Next, the switches SW5, SW7, SW9 are opened, and the electrodes 10b, 11b on the ITO film 9b side (second region B side) of the upper panel 3 are set to high impedance, which is in a state of being electrically disconnected (step S2, 5), the switches SW1 and SW2 are opened and the switch SW3 is closed, so that the electrode 6 of the ITO film 5 of the panel 2 is set to high impedance and the electrode 7 is set to the voltage measurement mode (see step S3, FIG. 5). Then, the switches SW4 and SW6 are closed and the switch SW8 is opened, and a voltage of 5V is applied to the electrode 10a of the ITO film 9a of the upper panel 3 and 0V is applied to the electrode 11a (see step S4, FIG. 5). As a result, a current flows between the electrodes 10a and 11a of the ITO film 9a, and the Y coordinate of the first region A can be detected.
[0023]
Next, it is determined whether or not the upper panel 3 of the first area A is pressed (step S5). This determination is made based on the voltage value of the electrode 7 of the lower panel 2. That is, when the voltage detector 15 detects a voltage (when the voltage is not 0), it is determined that the upper panel 3 of the first region A is pressed (Y in step S5), and the voltage detector 15 If no voltage is detected (when the voltage is 0), it is determined that the upper panel 3 of the first region A has not been pressed (N in step S5).
[0024]
When it is determined that the upper panel 3 of the first area A is pressed (Y in step S5), the voltage value of the electrode 7 of the lower panel 2 detected by the voltage detector 15 is converted into a Y coordinate. Stored in Y1 of the coordinate storage table (step S6). Here, the principle of coordinate detection will be described. The voltage of the first region A in the ITO film 9a is closer to 5V as it is closer to the electrode 10a, closer to 0V as it is closer to the electrode 11a, and linearly changes from the electrode 10a to the electrode 11a. Therefore, the relationship between the voltage and the Y coordinate position in the first region A in the ITO film 9a is such that the voltage is higher as the position is closer to the electrode 10a (the Y coordinate value is smaller) and the position closer to the electrode 11a (the Y coordinate value is smaller). The larger the voltage, the lower the voltage. When a certain point in the first region A is pressed and the ITO film 9a of the upper panel 3 comes into contact with the ITO film 5 of the lower panel 2, the voltage of the ITO film 9a at the pressing point is lower panel 2. Is detected by the voltage detector 15 connected to the electrode 7, and the Y coordinate is obtained based on this voltage.
[0025]
At this time, even if a certain point in the second region B of the upper panel 3 is pressed and the ITO film 9b in the second region B is in contact with the ITO film 5 in the lower panel, the ITO film in the second region B Since no voltage is applied to 9b and it is in an electrically disconnected state, this pressing does not affect the detection of the Y coordinate of the first area A.
[0026]
On the other hand, if it is determined in step S5 that the voltage detected by the voltage detector 15 is 0 V and the upper panel 3 of the first area A is not pressed (N in step S5), the process proceeds to step S7. .
[0027]
Next, the switches SW4, SW6, and SW8 are opened, and the electrodes 10a and 11a on the ITO film 9a side (first region A side) of the upper panel 3 are set to high impedance (step S7, see FIG. 6). The opening switch SW3 is closed, the electrode 6 of the ITO film 5 of the panel 2 is set to high impedance, and the electrode 7 is set to the voltage measurement mode (step S8, see FIG. 6). Then, the switches SW5 and SW7 are closed and the switch SW9 is opened, and a voltage of 5V is applied to the electrode 10b of the ITO film 9b of the upper panel 3 and 0V is applied to the electrode 11b (see step S9, FIG. 6). As a result, a current flows between the electrodes 10b and 11b of the ITO film 9b, and the Y coordinate of the second region B can be detected.
[0028]
Next, it is determined whether or not the upper panel 3 of the second area B is pressed (step S10). This determination is made based on the voltage value of the electrode 7 of the lower panel 2 as in step S5. That is, when the voltage detector 15 detects a voltage (when the voltage is not 0), it is determined that the upper panel 3 of the second region B is pressed (Y in step S10), and the voltage detector 15 Is not detected (when the voltage is 0), it is determined that the upper panel 3 of the second region B has not been pressed (N in step S10).
[0029]
If it is determined that the upper panel 3 of the second region B has been pressed (Y in step S10), the voltage value of the electrode 7 of the lower panel 2 detected by the voltage detector 15 is converted into a Y coordinate and stored in coordinates. Store in Y2 of the table (step S6). The principle of coordinate detection is the same as described above.
[0030]
At this time, even when a certain point in the first region A of the upper panel 3 is pressed and the ITO film 9a in the first region A is in contact with the ITO film 5 in the lower panel, the ITO film in the first region A Since no voltage is applied to 9a and it is in an electrically disconnected state, this pressing does not affect the detection of the Y coordinate of the second region B.
[0031]
On the other hand, if it is determined in step S10 that the voltage detected by the voltage detector 15 is 0 V and the upper panel 3 of the second region B is not pressed (N in step S10), the process proceeds to step S12. .
[0032]
Next, the switches SW4 and SW5 are opened to set the electrodes 10a and 10b of the upper panel 3 to high impedance, the switches SW6 and SW7 are opened and the switches SW8 and 9 are closed, and the electrodes 11a and 11b on the upper panel are set to the voltage measurement mode ( Step S12, see FIG. Then, the switches SW1 and SW2 are closed and the switch SW3 is opened, and a voltage of 5V is applied to the electrode 6 and 0V to the electrode 7 of the lower panel 2 (see step S13, FIG. 7). As a result, a current flows between the electrodes 6 and 7 of the ITO film 5, and the X coordinates of the first and second regions A and B can be detected.
[0033]
Next, it is determined whether or not the upper panel 3 of the first area A is pressed (step S14). This determination is made based on the voltage value of the electrode 11a of the upper panel 3. That is, when the voltage detector 16 detects a voltage (when the voltage is not 0), it is determined that the upper panel 3 of the first region A is pressed (Y in step S14), and the voltage detector 16 If no voltage is detected (when the voltage is 0), it is determined that the upper panel 3 of the first area A has not been pressed (N in step S14).
[0034]
When it is determined that the upper panel 3 of the first area A is pressed (Y in step S14), the voltage value of the electrode 11a detected by the voltage detector 16 is converted into an X coordinate and stored in the coordinate storage table. Store in X1 (step S15). Here, the principle of coordinate detection will be described. The voltage in the ITO film 5 is closer to 5 V as it is closer to the electrode 6, closer to 0 V as it is closer to the electrode 7, and changes linearly from the electrode 6 toward the electrode 7. Therefore, the relationship between the voltage in the ITO film 5 and the X coordinate position is such that the closer to the electrode 6 (the smaller the X coordinate value), the higher the voltage, and the closer to the electrode 7 (the larger the X coordinate value), the lower the voltage. It has become. When a certain point in the first region A is pressed and the ITO film 9a of the upper panel 3 comes into contact with the ITO film 5 of the lower panel 2, the voltage of the ITO film 5 at the pressed point is changed to the upper panel 3. The voltage detector 16 connected to the electrode 11a detects the X coordinate based on this voltage.
[0035]
On the other hand, if it is determined in step S14 that the voltage detected by the voltage detector 16 is 0 V and the upper panel 3 of the first area A is not pressed (N in step S14), the process proceeds to step S16. .
[0036]
Next, it is determined whether or not the upper panel 3 of the second area B is pressed (step S16). This determination is made based on the voltage value of the electrode 11b of the upper panel 3. That is, when the voltage detector 17 detects a voltage (when the voltage is not 0), it is determined that the upper panel 3 of the second region B is pressed (Y in step S14), and the voltage detector 17 If no voltage is detected (when the voltage is 0), it is determined that the upper panel 3 of the second region B has not been pressed (N in step S16).
[0037]
When it is determined that the upper panel 3 of the second region B is pressed (Y in step S14), the voltage value of the electrode 11b detected by the voltage detector 17 is converted into the X coordinate and the coordinate storage table Store in X2 (step S17). The principle of coordinate detection is the same as in the case of the first region A.
[0038]
In the present embodiment, the X coordinate detection process of the first area A and the X coordinate detection process of the second area B have been described as time-shifted processes. However, these processes are performed in parallel. You can go. At this time, since the currents flowing from the electrodes 11a and 11b to the voltage detectors 16 and 17 are very small and they do not interfere with each other, even in the simultaneous measurement of these two voltages, the voltage detectors 16 and 17 Voltage measurements are made accurately.
[0039]
On the other hand, if it is determined in step S16 that the voltage detected by the voltage detector 17 is 0 V and the upper panel 3 of the second region B is not pressed (N in step S16), nothing is done.
[0040]
The processing from step S1 to step S17 as described above is executed in a very short time compared to the pressing operation. By repeating this process, the coordinates of the first and second areas A and B can always be detected.
[0041]
As described above, in this embodiment, the pressing input effective area of the upper panel 3 is divided into the first area A and the second area B, and one point pressing is performed for each of the areas A and B. Since the coordinates of the points can be detected, the positions of the XY coordinates can be accurately detected even when the points are simultaneously pressed one by one in the first and second regions A and B. Thereby, two operators can operate one resistive film type touch panel at the same time by setting and operating the use area.
[0042]
Here, there is a portion where the ITO film is not deposited between the first region A and the second region B, and there is a restriction that input in this portion cannot be performed. If the application is such that the buttons are not displayed on the portion where the input cannot be performed in the display device on which the touch panel 1 is mounted, there is no problem.
[0043]
In the present embodiment, the example in which the two areas A and B are provided as the press input effective area has been described. However, the present invention is not limited to this, and a plurality of areas may be used. For example, when three effective press input areas are provided, as shown in FIG. 8, three ITO films 9c, 9d, and 9e are arranged in the X direction on the upper panel, and electrodes 10c, 11c, 10d, 11d and electrodes 10e and 11e may be provided.
[0044]
In this embodiment, the application example to the analog resistive touch panel 1 has been described. However, the present invention may be applied to a digital resistive touch panel.
[0045]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the touch panel which can detect the position of the several point pressed simultaneously can be obtained.
[Brief description of the drawings]
FIG. 1 is a vertical side view showing a resistive touch panel according to an embodiment of the present invention.
FIG. 2 is a schematic diagram showing a resistive film type touch panel.
FIG. 3 is a block diagram showing electrical connection of a resistive touch panel.
FIG. 4 is a flowchart showing a flow of coordinate detection processing.
FIG. 5 is a schematic diagram showing a resistive touch panel when detecting a Y coordinate of a first region.
FIG. 6 is a schematic diagram showing a resistive touch panel when detecting a Y coordinate of a second region.
FIG. 7 is a schematic diagram showing a resistive touch panel when detecting the X coordinate of the first and second regions.
FIG. 8 is a schematic diagram showing a resistive film type touch panel corresponding to a three-point press input.
FIG. 9 is a vertical side view showing a conventional resistive touch panel.
FIG. 10 is a perspective view showing a resistive film type touch panel.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Resistance film type touch panel, 2 ... Lower panel (1st panel), 3 ... Upper panel (2nd panel), 5 ... ITO film (1st resistance film), 6 ... Electrode (1st electrode part) ), 7... Electrode (first electrode portion), 9 a to 9 e... ITO film (second resistance film), 10 a to 10 e... Electrode (second electrode portion), 11 a to 11 e. Part)

Claims (1)

第１の抵抗膜と、前記第１の抵抗膜において前記第１の抵抗膜の第１の方向に間隔をあけて対向配置され前記第１の抵抗膜に接触している一対の第１の電極部とを有する第１のパネルと、
前記第１の抵抗膜に間隔をあけて対向配置され前記第１の方向に並べて配置された複数の第２の抵抗膜と、これらの第２の抵抗膜毎に前記第１の方向に直交する第２の方向に間隔をあけて一対ずつ対向配置され対応する前記第２の抵抗膜に接触している複数対の第２の電極部とを有する第２のパネルと、
を備え、
前記パネルへの押圧動作によりその押圧点に対応した前記第１の抵抗膜と前記第２の抵抗膜とが接触する抵抗膜式タッチパネル。A first resistance film and a pair of first electrodes that are disposed opposite to each other in the first direction of the first resistance film in the first resistance film and are in contact with the first resistance film A first panel having a portion;
A plurality of second resistance films arranged opposite to each other with a space between the first resistance films and arranged in the first direction, and each of the second resistance films is orthogonal to the first direction. A second panel having a plurality of pairs of second electrode portions which are arranged to face each other in pairs in the second direction and are in contact with the corresponding second resistance films;
With
A resistance film type touch panel in which the first resistance film and the second resistance film corresponding to the pressing point come into contact with each other by pressing the panel.
JP2003203730A 2003-07-30 2003-07-30 Resistance film type touch panel Pending JP2005049978A (en)

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