1252436 玖、發明說明： (一） 發明所屬之技術領域 本發明是關於具備配置於載置有被檢體的載置面下的 影像讀取電路，藉由以影像讀取裝置讀取前述被檢體以輸 入前述被檢體的像之影像輸入裝置。 (二） 先前技術 指紋因是呈現個人特有的模樣，故在進行個人認證上 爲非常有用的手段。近年來適用指紋於個人認證的指紋認 證裝置被開發。具體上，指紋認證裝置係藉由核對以影像 讀取裝置讀取的指紋影像與預先登錄的登錄者指紋影像資 料進丫了個人認證’ f合載於P C (P e r s ο n a 1 C 〇 m p u t e r:個人電腦） 、PDA(Personal Digital Assistants:個人數位處理器）、行 動電話等的資訊機器被檢討。 在日本特開2002-94040號公報係記載關於指紋認證裝 置所使用的二次元影像讀取裝置。此二次元影像讀取裝置 具備：複數個光感測器排列於透明基板上而成的光感測器陣 列（photosensor array)、面對光感測器陣列的背面而配置於 光感測器陣列的背側之背光（back light)、被覆光感測器陣 列表面的透明的電極層、檢測電極層的電壓的變化之檢測 部。若針對習知的二次元讀取裝置的動作以及使用方法說 明的話，因被驗者自身成爲特有的電阻與電容，故若被驗 者載置手指於電極層上，則藉由因手指接觸於電極層而產 生的特有的電壓變化被檢測部檢測，藉由由檢測部進行的 手指檢測使背光點亮而照射光於手指，藉由由檢測部進行 一 5一 1252436 的手指檢測使光感測器陣列進行影像讀取動作以讀取手指 的像。被光感測器陣列讀取的手指的像係以藉由接觸面內 的手指的凹凸造成的反射光的強度分布表示的指紋影像。 (三）發明內容 但是，手指的發汗狀態係因人而異，載置手指於電極 層時以手指按壓電極層的力量也因人而異。若手指的發汗 狀態不同，則因手指接觸於電極層所造成的特有的電壓變 化也不同，若按壓電極層的力不同，則手指與電極層的接 觸面積也不同，電極層的電壓變化也不同。因此，在習知 的二次元影像讀取裝置中，若使發汗狀態的個人差造成的 偏差或以手指按壓的力量的偏差的容許量過窄的話，有某 人載置手指於電極層，此人的手指即使藉由檢測部檢測可 讀取指紋影像，也有其他的人即使載置手指於電極層也不 能藉由檢測部使該其他的人的手指藉由檢測部檢測，有無 法讀取該其他人的指紋影像。即使相同個人也因情況手指 的發汗狀態或按壓力會有所不同，有無法讀取手指的指紋 影像之虞。而且，若加寬容許量，則對手指以外接觸電極 層者也有誤動作的可能性，而且，若加寬容許量到按壓電 極層的力量微弱的情形爲止，則因手指的凸部不密接於電 _層’故指紋的紋樣無法淸楚地讀取，有無法正確地認證 白勺可能性。再者，這種微弱的電壓變化由於周圍的電磁波 等的雜訊使精度高的檢測困難。 因此’本發明的目的爲提供可簡易確實地讀取影像， 可讀取鮮明的影像的影像輸入裝置。 -6 一 1252436 爲了解決以上的課題，本發明中的影像輸入裝置包含： 配置於載置有被檢體的載置面下的影像讀取電路；以 及 藉由賦予前述載置面的壓力檢測前述被檢體被載置於 前述載置面的檢測手段。 在本發明中若在載置面載置有被檢體，則因由被檢體 賦予壓力給載置面，檢測手段藉由賦予載置面的壓力檢測 被檢體的載置，故當被檢體未載置於載置面時可停止影像 讀取電路的讀取動作，並且當被檢體載置於載置面時可迅 速停止影像讀取電路的讀取動作，故可抑制未由被檢體載 置於載置面時的功率消耗（power consumption)，爲了進行 讀取動作，除了放置手指以外無須進行特別的動作。因此 ，僅被檢體載置於載置面就能確實地讀取被檢體的影像。 而且，被檢體適用手指的情形，在習知有起因於手指 的發汗狀態等無法檢測手指的載置的情形，惟在本發明中 若手指被載置於載置面的話，因壓力被賦予載置面，故可 藉由檢測手段確實地檢測手指的載置，可確實地讀取手指 的影像。 在本發明中，前述檢測手段具備： 檢測賦予前述載置面的壓力的壓力感測器；以及 對分隔以前述壓力感測器檢測的壓力水平成載置狀態 與未載置狀態的臨界値（t h r e s h ο 1 d v a 1 u e)比較，在達到前述 臨界値的情形輸出使影像讀取動作進行用的觸發信號 (triggering signal)給前述影像讀取電路的比較手段。 1252436 若被檢體載置於載置面，則由被檢體賦予壓力給載置 面’惟若由被檢體賦予載置面的壓力小的話，被檢體與載 置面的接觸面積小，假設爲以影像讀取電路讀取影像也無 法讀取鮮明的影像。但是，如果作成這種構成，則若顯示 由被檢體賦予載置面的壓力之檢測信號的位準（1 e v e 1)不爲 臨界値以上的話，因比較手段不輸出觸發信號，影像讀取 電路不進行影像讀取動作，故無讀取這種不鮮明的影像。 而且，若顯示由被檢體賦予載置面的壓力之檢測信號的位 準超過臨界値的話，因比較手段輸出觸發信號，影像讀取 電路進行影像讀取動作，在被檢體與載置面的接觸面積十 分大的情形以影像讀取電路讀取影像，故可確實地讀取鮮 明的影像。 而且’本發明若具備依照前述被檢體賦予前述載置面 的壓力，調節對前述被檢體照射光的光源的亮度的調節手 段，則根據由被檢體所產生的對載置面的壓力，使光源的 光照射強度被調節’故適合被檢體與載置面的接觸面積的 強度的光射入被檢體。因此，即使由被檢體造成的接觸壓 爲任何情形都能鮮明地讀取被檢體的影像。 而且，本發明中的影像輸入裝置包含： 配置於載置有被檢體的載置面下的影像讀取電路；以 及 配置於前述影像讀取電路的下方，藉由賦予前述載置 面的壓力檢測前述被檢體被載置於前述載置面的檢測手段 一 8- 1252436 如果是這種構造，檢測被檢體的載置的檢測手段當被 檢體未載置於載置面時可停止影像讀取電路的讀取動作， 並且當被檢體載置於載置面時可迅速停止影像讀取電路的 讀取動作，再者因檢測手段配置於影像讀取.電路的下方， 故可對面方向小型化影像輸入裝置，特別是對攜帶性優良 的裝置（device)的認證裝置特別有效。 而且，本發明的影像輸入裝置包含： 藉由載置有手指的壓力輸出檢測信號的檢測手段； 當手指被載置於檢測手段上時，配置於具有手指的指 紋的部分的下方，讀取依照手指的凹凸的影像的複數個感 測器元件；以及 藉由前述檢測信號使前述複數個感測器元件的影像讀 取動作開始的驅動電路。 如此，因配置複數個感測器元件以在手指被載置於檢 測手段上時位於具有手指的指紋的部分的下方，故可簡便 地進行影像讀取動作，並且在手指不載置於檢測手段上時 感測器元件不進行影像讀取動作，故可抑制功率消耗。 (四）實施方式 以下使用圖面針對本發明的具體的樣態來說明。但是 未限定發明的範圍於圖示例。 [第一實施形態] 第1圖是顯示適用本發明的影像輸入裝置的指紋讀取 裝置1的俯視圖，第2 A圖以及第2 B圖是分別以第1圖的 虛線（Π )-( Π )顯示未載置有手指的狀態以及載置有手指的狀 -9 一 1252436 態的剖面圖。第3圖是以第1圖的虛線（m) - (m)顯示的剖面 圖。 指紋讀取裝置1具備：藉由變換由載置於接觸表面32a 的第一關節到尖端的手指FN反射的光或透過手指FN的光 量或強度成電氣信號，以讀取手指FN的指紋影像，並且光 學式感測器之固體攝像裝置與其驅動器係成一體的影像讀 取電路2，與藉由檢測來自影像讀取電路2的電氣信號，取 得手指FN的指紋影像資料的驅動電路1 0，與朝載置於影 像讀取電路2的接觸表面3 2 a的手指FN照射光的光照射手 段’與檢測藉由由第二關節到第一關節的手指FN的接觸所 產生的壓力之薄膜型的壓力感測器5 0，與保持手指FN於 影像讀取電路2以及壓力感測器5 0內的預定位置用的手指 保持部1 6。 首先針對光照射手段來說明。光照射手段具備：發出光 的LED、冷陰極螢光管這種光源14、導引由光源14發出 的光到影像讀取電路2，通過影像讀取電路2對被檢體的手 指FN照射光用的擴散導光板1 5。擴散導光板1 5係略平板 狀，除了面對光源1 4的側面以及面對影像讀取電路2的背 面之表面外被光反射材覆蓋。來自光源14的光在擴散導光 板1 5面擴散，由擴散導光板1 5的表面面放射的光係均等 地照射在影像讀取電路2的背面。此外，取代擴散導光板1 5 與光源1 4，使有機EL元件這種面發光元件面對影像讀取 電路2的背面而配設也可以。 其次，使用第1圖〜第4圖針對影像讀取電路2來說明 -10- 1252436 。第4A圖是顯示影像讀取電路2的一像素（pixel)的俯視圖 ，第4 B圖是以第4 A圖的虛線（IV B ) - (IV B )顯示的剖面圖。 影像讀取電路2具備：略平板狀的透明基板1 7，與由在 透明基板1 7的一側的面上排列成η行m列（η、m都是整數） 的矩陣狀的複數個N通道（channel)型雙閘極（double gate) 型電晶體構成的光感測器元件（以下稱爲感測器）20、20...， 與形成於排列有感測器元件2 0、2 0…的影像輸入區域8的 周圍透明基板17上的頂閘極驅動器（top gate driVe〇l 1、底 閘極驅動器（bottom gate driver)12、資料驅動器（data driver)13，以及被覆驅動器1 1、12、13以及感測器元件20 、20…的保護絕緣膜3 1，形成於保護絕緣膜3 1上的靜電除 去膜3 2。 透明基板1 7對由光源1 4射出的光之中可由感測器元 件20檢測的波長範圍的光具有透過性（以下僅稱爲透光性） ，並且具有絕緣性，爲石英玻璃等這種玻璃基板或聚碳酸 酯（polycarbonate)等這種塑膠基板。此透明基板17係構成 影像讀取電路2的背面，擴散導光板1 5係面對此透明基板 17° 各個感測器元件2 0係成爲像素的光電變換元件’具備： 形成於透明基板17上的底閘電極（bottom gate electrode)21 ，與形成於底閘電極2 1上的底閘絕緣膜22 ’與夾著底閘電 極2 1與底閘絕緣膜22，並且面對底閘電極2 1的半導體膜 23，與形成於半導體膜23的中央部上的由氮化矽構成的通 道保護膜24，與在半導體膜2 3的兩端部上互相分離而形成 -11- 1252436 的雜質半導體膜25、26，與形成於雜質半導體膜25上的源 電極（source electrode)27，與形成於雜質半導體膜26上的 汲電極（drain elec trod e)28，與形成於源電極27以及汲電極 28上的頂閘絕緣膜29,與夾著半導體膜23與頂閘絕緣膜29 以及通道保護膜24，並且面對半導體膜23的頂閘電極（top gate electrode)3 0 〇 在透明基板1 7上，底閘電極2 1係每一感測器元件20 都成爲矩陣狀而形成。而且在透明基板1 7上形成有延伸於 橫方向的η條底閘極線4 1、4 1…，排列於橫方向的同一行 的各感測器元件20的底閘電極2 1係與共通的底閘極線4 1 成一體而形成。底閘電極2 1以及底閘極線41具有導電性 以及遮光性，由例如鉻、鉻合金、鋁或鋁合金或這些元素 的合金構成。 在底閘電極2 1以及底閘極線4 1上形成有共通於所有 的感測器元件20、20…的底閘絕緣膜22。底閘絕緣膜22 具有絕緣性以及透光性，由例如氮化矽或氧化矽構成。 在底閘絕緣膜2 2上’半導體膜2 3係每一感測器元件2 0 都形成。半導體膜2 3係俯視呈略矩形狀，以若預定的波長 範圍的光被入射的話生成電子-電洞（hole)對的非晶矽 (amorphous silicon)或多晶矽（Polysilicon)形成的層。在半 導體膜23上形成有通道保護膜24 °通道保護膜24具有保 護半導體膜23的界面以免受圖案形成（PatterninS)所使用的 飩刻劑（etchant)影響的功能’具有絕緣性以及透光性’由 例如氮化矽或氧化矽構成。若對半導體膜2 3入射光的話’ - 12- 1252436 依照入射的光量的量的電子-電洞對會在通道保護膜24與 半導體膜23的界面附近產生於中心。所生成的載子（carrier) 之中的電洞依照底閘電極2 1以及頂閘電極3 0的電場保持 於半導體膜23或通道保護膜24內。 在半導體膜2 3的一端部上，雜質半導體膜2 5係一部 分與通道保護膜24重疊而形成，在半導體膜23的他端部 上，雜質半導體膜26係一部分與通道保護膜24重疊而形 成。雜質半導體膜25、26係每一感測器元件20都被形成 圖案。雜質半導體膜25、26係由包含η型的雜質離子的非 晶矽（η +矽）構成。 在雜質半導體膜25上形成有每一感測器元件20都被 形成圖案的源電極27。在雜質半導體膜26上形成有每一感 測器元件20都被形成圖案的汲電極28。而且，延伸於縱方 向的m條基準電壓線42、42…以及資料線43、43...係形成 於底閘絕緣膜22上，排列於縱方向的同一列的各感測器元 件20的源電極27係與共通的基準電壓線42 —體形成，排 列於縱方向的同一列的各感測器元件2 0的汲電極2 8係與 共通的資料線4 3 —體形成。源電極2 7、汲電極2 8、基準 電壓線42以及資料線4 3具有導電性以及遮光性，由例如 絡、絡合金、錦或銘合金或适些兀素的合金構成。 在所有的感測器元件2 0、2 0…的通道保護膜2 4、源電 極2 7以及汲電極2 8以及基準電壓線4 2、4 2…以及資料線 4 3、4 3…上形成有共通於所有的感測器元件2 0、2 0 ...的頂 閘絕緣膜29。頂閘絕緣膜29具有絕緣性以及透光性，由例 -13- 1252436 如氮化矽或氧化矽構成。 在頂閘絕緣膜29上形成有每一感測器元件20都被形 成圖案的頂閘電極3 0。而且，在頂閘絕緣膜2 9上形成有延 伸於橫方向的η條頂閘極線44，排列於橫方向的同一行的 各感測器元件2 0的頂閘電極3 0係與共通的頂閘極線4 4 一 體形成。頂閘電極3 0以及頂閘極線44具有導電性以及透 光性，例如由氧化銦、氧化鋅或氧化錫或包含這些化合物 之中的至少一個的混合物（例如摻雜錫的氧化銦（ΙΤΟ)或摻 雜鋅的氧化銦）形成。 如以上構成的感測器元件20係以半導體膜23當作受 光部的光電變換元件。 在所有的感測器元件20、20…的頂閘電極30以及頂閘 極線44、44.··上，共通的保護絕緣膜31係接觸於頂閘電極 3 0以及頂閘極線4 4而形成。保護絕緣膜31具有絕緣性以 及透光性，由氮化矽或氧化矽構成。 在保護絕緣膜3 1上靜電除去膜3 2係形成於一面。靜 電除去膜3 2具有導電性以及透光性，例如由氧化銦、氧化 鋅或氧化錫或包含這些化合物之中的至少一個的混合物（例 如摻雜錫的氧化銦（IT 0)、摻雜鋅的氧化銦）形成。靜電除 去膜32被接地，保持於0(V)，藉由除去手指FN所帶的靜 電，以防止感測器元件20、20…或頂閘極驅動器1 1、底閘 極驅動器1 2、資料驅動器1 3因靜電而破壞。靜電除去膜3 2 的接觸表面3 2a係成手指FN所接觸的影像讀取電路2的面 -14- 1252436 在以上的影像讀取電路2中，由擴散導光板1 5入射到 透明基板1 7的光被底閘電極2 1遮蔽，不直接入射到半導 體膜2 3。而且，在感測器元件2 0、2 0…之間因未形成有底 鬧電極2 1，故由擴散導光板1 5入射到透明基板1 7的光透 過感測器元件20、2〇···之間，由影像讀取電路2的表面射 出到外部。 針對影像讀取電路2的驅動器來說明。如第1圖所示 基準電壓線42、42…係保持於一定電壓，例如被接地保持 於0(V)。底閘極線41、41 ···係連接於底閘極驅動器12的輸 出。頂閘極線44、44…係連接於頂閘極驅動器1 1的輸出。 頂鬧極驅動器1 1爲移位暫存器（S h i f t r e g i s t e r)，依第 一行的頂閘極線44到第n行的頂閘極線44的順序（達到第 η行的話依照需要返回到第一彳了）輸出重設（r e s e t)信號。當 重設信號輸出到某行的頂閘極線44時，該頂閘極線44成 爲除去儲存於半導體膜23以及通道保護膜24的電洞的高 位準的重設電位，當重設信號未輸出到某行的頂閘極線44 時，該頂閘極線44以及連接與頂閘極線44的頂閘電極3 0 係成爲保持藉由入射到半導體膜23的光生成的電子-電洞 對之中電洞的低位準的載子儲存電位。 底聞極驅動器1 2爲移位暫存器，依第一行的底聞極線 4 1到第η行的底閘極線4 1的順序（達到第η行的話依照需 要返回到第一行）輸出高位準的read信號。當read信號輸 出到某行的底閘極線4 1時，該底閘極線41以及連接於底 閘極線4 1的底閘電極2 1係成爲在半導體膜2 3形成有通道 -15- 1252436 的讀取電位，通道的區域的大小係依存於入射到半導體膜2 3 的光量。 使頂閘極驅動器1 1在輸出重設信號到第i行爲1〜11 的任意整數）的頂閘極線44後，底閘極驅動器12輸出read 信號到第i行的底閘極線4 1，頂閘極驅動器1 1以及底閘極 驅動器1 2偏移輸出信號。 資料驅動器1 3在輸出重設信號到輸出re ad信號爲止 之間對所有的資料線43、43.··輸出預定位準（高位準）的預 充電（pre-charge)信號。再者，資料驅動器13在預充電 (pre-charge)信號的輸出後放大資料線43、43…的電壓，輸 出到驅動電路1 0。 其次，針對驅動電路1 0來說明。 驅動電路1 0藉由輸出控制信號Bent給底閘極驅動器1 2 以適宜輸出read信號給底閘極驅動器1 2，藉由輸出控制信 號Tent給頂閘極驅動器1 1以適宜輸出重設信號給頂閘極 驅動器1 1，藉由輸出控制信號Dent給資料驅動器1 3以適 宜輸出預充電（p r e - c h a r g e)信號給資料驅動器1 3。而且，驅 動電路1 0藉由檢測輸出read電壓後經過預定時間後的資 料線43、43…的電壓，或藉由檢測輸出read電壓後資料線 43、43···的電壓到達預定臨限電壓（threshold voltage)爲止 的時間以取得手指FN的指紋影像。 其次，針對壓力感測器5 0來說明。 如第2A圖所示壓力感測器50具備：在透明基板17上 接鄰於影像讀取電路2而配置，形成於透明基板1 7上的互 一 1 6 - 1252436 相平行，延伸於行方向的複數條電極線5 1、5 1…，與比酉己 設於複數條電極線5 1、5 1 ...間的電極線5 1高的間隔物 (SpaCe〇53、53...，與互相平行延伸於列方向的複數條電極 線52、52…形成於背面的可撓性的薄層（sheet)材55，覆蓋 薄層材5 5的周圍，接合透明基板1 7與薄層材5 5的密封墊 (seal)54，成爲複數條電極線52、52…藉由間隔物53與複 數條電極線5 1、5 1 ...分離，而且以俯視使電極線52直交於 電極線5 1，且使電極線5 1與電極線52面對面而貼合薄層 材5 5與透明基板1 7的構成。間隔物5 3、5 3 ...係配設於薄 層材5 5的背面中的複數條電極線5 2、5 2 ...間而配置也可以 。而且，在以手指重複持續按壓壓力感測器5 0後若有在未 被按壓的狀態下複數條電極線5 1、5 1 ...與複數條電極線5 2 、52...可分離的程度的充分的復原力的話，間隔物53未必 需要。 在壓力感測器5 0的電極線5 1以及電極線5 2的至少一 方，由後述的檢測電路6 1輸出電壓，如第2B圖所示若手 指FN被載置於影像讀取電路2上以及壓力感測器5 0上， 則藉由手指FN的加壓力使薄層材5 5彎曲，伴隨於此，電 極線5 2彎曲與電極線5 1接觸。此時因電極線5 1以及電極 線5 2導通，故流過電極線51以及電極線5 2的電流或電極 線5 1以及電極線5 2的至少一方的電壓或電阻値等的電氣 的特性變化。此電氣的特性的變化係設計使手指FN與按壓 壓力感測器5 0的力量成比例，故若檢測電路61讀取手指 FN充分按壓壓力感測器5 0程度的電氣的特性變化，則判 1252436 斷爲手指FN的尖端載置於影像讀取電路2上，光源1 4昭 射光開始影像讀取電路2的讀取動作。爲了使手指fn未充 分地按壓壓力感測器5 0，在手指FN不充分地附著於影像 讚取電路2的狀態下，因電氣的特性變化小，故驅動電路j 〇 不進行影像讀取電路2的讀取動作。因此，因附著不充分 ’不僅影像讀取電路2不讀取手指FN的指紋的陰影爲不鮮 明的影像，因光源1 4不發光，故對被驗者非藉由認證而被 拒絕而是可察覺到不充分按壓手指FN。因此，被驗者充分 按壓手指FN於壓力感測器5 0以及影像讀取電路2以便驅 動電路1 0進行影像讀取電路2的讀取動作，故可讀取鮮明 的影像，可容易認證。 壓力感測器5 0在電極線5 1以及電極線5 2的至少一方 的表面配設感壓性墨水層也可以。此情形，在電極線5 1感 壓性墨水層在與電極線5 2的交叉部中重疊而配置。電極線 5 1以及電極線5 2間的電阻係成爲依存.於賦予感壓性墨水層 的壓力，若壓力的大小變化的話電阻等也會變化的特性。 在此壓力感測器5 0中，藉由電極線5 1與電極線5 2的交叉 邰中的電阻等可檢測該交叉部的壓力。而且，壓力感測器5 0 因若以俯視看的話交叉部係排列成矩陣狀，故藉由檢測電 路6 1測定每一個交叉部的電極線5 1或電極線5 2的電氣特 性的變化，可檢測面內的壓力分布，並且可檢測面內全體 的壓力。其中，當檢測電路6 1檢測面內的壓力分布大致均 等的情形，壓力感測器5 0判斷爲具有手指FN的尖端的指 紋的部分無不均地載置於影像讀取電路2上，光源1 4照射 -18- 1252436 光開始影像讀取電路2的讀取動作。另一方面，面內的壓 力分布不均等顯著地偏向一方的情形，因有具有手指FN的 尖端的指紋的部分無不均地不接觸於影像讀取電路2的可 能性，故光源1 4不照射光不開始影像讀取電路2的讀取動 作。 如第1圖所示，以俯視（朝影像讀取電路2的接觸表面 3 2a看），壓力感測器5 0與影像讀取電路2係配置於互異的 位置。詳細爲壓力感測器5 0係接鄰於影像讀取電路2而配 置，壓力感測器5 0的表面與影像讀取電路2的接觸表面3 2a 成爲同一平面，壓力感測器50的表面也是載置有手指FN 的載置面。 其次，針對手指保持部1 6來說明。 在手指保持部1 6形成有開口成由手指FN的尖端到第 二關節的手指形狀的開口部1 6a，手指保持部1 6係安裝於 影像讀取電路2的接觸表面3 2 a以及壓力感測器5 0的表面 ，使排列有感測器元件20、20…的影像輸入區域8以及排 列有電極線5 1與電極線5 2的交叉部的壓力檢測區域露出 於開口部。對應手指的末節的手指保持部1 6的開口部係配 設於影像輸入區域8。 其次，針對指紋讀取裝置1的電路構成使用第5圖來 說明。 如第5圖所示，指紋讀取裝置1除了影像讀取電路2、 驅動電路1 0以及壓力感測器5 0外也具備檢測電路6 1、比 較電路 62、CPU63、RAM64、ROM65、言己憶部 66。 - 1 9 一 1252436 檢測電路6 1驅動壓力感測器5 Ο，輸入輸出到壓力感測 器5 0的電極線5 1以及電極線5 2的至少一方的信號的電氣 的特性變化，輸出顯示藉由壓力感測器5 0檢測的面內的全 體的壓力的水平之檢測信號給比較電路6 2。而且，檢測電 路6 1將表示由壓力感測器5 0檢測的壓力分布的壓力分布 資料輸出到C P U 6 3。 比較電路6 2由檢測電路6 1輸入檢測信號，對分隔手 指載置狀態與手指未載置狀態的臨界値比較檢測信號的位 準，在檢測信號的位準超過臨界値的情形輸出觸發信號給 驅動電路1 〇。 藉由賦予壓力感測器50表面的壓力在影像讀取電路2 的接觸表面32a檢測載置有手指FN的檢測手段係由以上的 壓力感測器50與檢測電路61與比較電路62構成。 驅動電路1 〇在由比較電路62輸入觸發信號的情形下 ，首先輸出使光源1 4發光的信號，以使光源1 4發光。而 且，驅動電路1 〇在光源1 4的發光後輸出控制信號Bent給 底閘極驅動器1 2，輸出控制信號Tent給頂閘極驅動器1 1 ，進一步輸出控制信號群Dent給資料驅動器1 3。據此，影 像讀取電路2開始動作。藉由影像讀取電路2的動作，手 指FN的指紋影像被驅動電路1 〇取得，將該指紋影像的資 料輸出到CPU63 。 在記憶部66每一登錄者儲存有手指的末節的登錄指紋 影像資料。而且’記憶部66在儲存登錄指紋影像資料的區 域以外具有儲存種種的資料的資料儲存區域，資料儲存區 -20- 1252436 域係由特定區域與通常區域構成。此登錄影像資料爲表示 由指紋抽出的複數個特徵點的相對的位置的資料也可以， 爲影像也可以。 在ROM65儲存有對CPU63可實行的程式。CPU63係 以RAM64作爲作業區域，依照儲存於ROM65的程式，由 驅動電路1 〇輸入指紋影像資料，或由檢測電路61輸入壓 力分布資料，或藉由輸入的壓力分布資料判定是否視載置 於壓力感測器5 0表面者爲手指的中節’或當判定視載置於 壓力感測器5 0表面者爲手指的中節的情形’藉由比較由驅 動電路1 〇輸入的指紋影像資料與儲存於記億部66的登錄 指紋影像資料，以判定是否視指紋影像資料與登錄指紋影 像資料一致。再者，C P U 6 3在視指紋影像資料與登錄指紋 影像資料一致的情形下起動保密模式（secret mode)，在未 視指紋影像資料與登錄指紋影像資料一致的情形下起動通 常模式。 針對本實施形態的指紋讀取裝置1的動作以及使用方 法來說明。 在壓力感測器5 0的表面未接觸任何東西時’因表示藉 由壓力感測器5 0檢測的面內的全體的壓力的檢測信號的位 準未滿臨界値，故不由比較電路6 2輸出觸發信號給驅動電 路1 0。 另一'方面如第2 A圖所不’被驗者使手指F N的末節載 置於靜電除去膜3 2的接觸表面3 2 a，同時載置手指F N的 中節於壓力感測器5 0的表面的話’光源14發光’由擴散 -2 1- 1252436 導光板1 5發出的光經由影像讀取電路2入射到手指FN， 被手指F N反射的反射光入射到感測器元件2 0、2 0…的半 導體膜2 3。入射到感測器元件2 0、2 0…的半導體膜2 3的 反射光的面內強度分布係根據沿著手指FN的凹凸。來自入 射到附著於接觸表面32a的手指FN的凸部的光源1 4的光 係傳播於手指FN的表皮內，最終朝位於凸部下方的感測器 元件2 0散射。此散射光是以高強度入射到感測器元件2 0 的半導體膜2 3，使電子-電洞對生成。相對地，在由接觸表 面32a分離的手指FN的凹部中，在取入凹部與接觸表面32a 之間的空間後，在凹部與空間之間重複漫反射而衰減，故 在凹部下方的感測器元件20的半導體膜23光未充分被反 射，電子-電洞對未被充分地生成。 其中，因在壓力感測器5 0未載置有手指FN的中節， 故由手指FN賦予壓力給壓力感測器5 0。若此時的壓力對 以手指FN按壓達到充分程度的話，位於壓力感測器5 0的 電極線5 1、5 1…與電極線5 2、5 2…的各交點的複數個壓力 檢測點的幾個導通，產生電位變化。而且，若複數個壓力 檢測點之中導通的位置達到預定的數目的話，檢測信號的 壓力水平達到臨界値，由比較電路6 2輸出觸發信號給驅動 電路1 0。 由比較電路62輸入觸發信號的驅動電路1 0首先輸出 使光源14發光的信號，光源14朝接觸表面32a照射光。 接者’驅動電路1 0輸出控制信號T c n t給頂閘極驅動器1 1 ’輸出控制信號Bent給底閘極驅動器1 2，進一步輸出控制 -22- 1252436 信號Dent給資料驅動器13。 在影像讀取電路2內的預定行的感測器元件20、20... 中，由來自頂閘極驅動器1 1的相對地正電壓構成的重設信 號被施加於頂閘電極3 0，到此爲止放出儲存於半導體膜2 3 以及通道保護膜24的電洞。接著，頂閘電極30被施加到_ 20(V)，底閘電極21成爲0(V)，開始由構成指紋的手指FN 的凹凸所造成的反射光的讀取。 手指FN的凸部因接觸接觸表面3 2a，故有效地將來自 光源1 4的光入射到位於下方的感測器元件2 0的半導體膜2 3 ，生成多量的電子-電洞對。此時，藉由施加給頂閘電極3 0 的負電場，僅正電荷的電洞被陷入（trap)半導體層23以及 通道保護膜2 4，電子因此負電場而排斥被放出到感測器元 件20之外。另一方面，手指FN的凹部因不接觸接觸表面 3 2 a，故來自光源1 4的光藉由凹部與接觸表面之間的低折 射率的空間而漫反射，使來自光源1 4的光不入射到位於下 方的感測器元件20的半導體膜23 ’電洞不充分儲存於半導 體膜23以及通道保護膜24。 而且，資料驅動器13對所有的資料線43、43…輸出高 位準的預充電（p r e - c h a r g e)信號，保持資料線4 3、4 3…於預 定的電壓。 底閘極驅動器1 2在施加-2 0 (V)給頂閘電極3 0經過預定 時間後，施加+ 1 〇 (v)的電壓給底聞電極2 1 °此時’在位於 手指F N的凹部的下方的感測器兀件2 0以及未載置有手指 F N的部分的下方的感測器元件2 0中’因充分的光未被入 -23- 1252436 射，在半導體膜2 3以及通道保護膜24未儲存有電洞，故 由來自想在半導體膜23形成通道的底閘電極21的+l〇(V) 的電壓產生的電場被由來自想使通道消失的頂閘電極3 〇的 -2 0(V)的電壓產生的電場打消，因空乏層在半導體膜23擴 大，故在源極/汲極間電流不流動，資料線4 3的預充電 (pre-charge)電壓原封不動被保持。 相對地，在位於手指FN的凸部的下方的感測器元件2 0 因來自光源14的反射光不被充分地入射，故在半導體膜23 以及通道保護膜24儲存有電洞。此電洞具有在頂閘電極3 〇 被-20(V)的電場吸引，同時根據其電荷量抵銷頂閘電極30 的負電場之作用。因此，底閘電極21爲0(V)時通道未形成 ，但若底閘電極21轉爲+l〇(V)的話，由底閘電極21的電 場以及所儲存的電洞所產生的正電場比頂閘電極3 0的負電 場還大，在半導體層23形成有通道。因此，電流由藉由預 充電（pre-charge)電壓成爲高電位的汲電極28到接地的源 電極2 7不流動，資料線4 3的電位低。 資料驅動器1 3藉由因此光的入射的有無而讀取產生差 的資料線43、43…的電位下降，可檢測手指的凸部或凹部 。由此重設信號的輸出到資料線4 3、4 3…的電位的取入的 上述一連的動作係每一各行依次進行。 而且’ CPU63判定是否視由感測器元件2〇、2〇…輸入 的指紋影像資料與記憶部6 6的登錄指紋影像資料一致。而 且，CPU63在視指紋影像資料與登錄指紋影像資料一致的 情形下起動保密模式。保密模式係指C p u 6 3可在記憶部6 6 一 24~ 1252436 的特疋區域以及通常區域存取或門鎖定（d ο o r 1 o c k)等被角琴 除的模式。另一方面，CPU63在未視指紋影像資料與登錄 指紋影像資料一致的情形下起動通常模式。通常模式係指 CPU63可在記憶部66的通常區域存取且無法在特定區域存 取或門鎖定等未被解除的模式。 針對本實施形態的功效來說明。 手指F N之中由第一關節到尖端係載置於影像讀取電路 2的接觸表面32a，同時由第二關節到第一關節僅被載置於 壓力感測器5 0的表面，可確認手指的載置，開始指紋影像 的讀取。如此在載置手指於預定的位置後，以不同的手指 按壓開始指紋認證的按鈕，使被驗者無須進行兩次步驟， 可簡便地開始讀取。而且，若未載置手指FN，則因影像讀 取電路2不動作故可抑制功率消耗。 而且如第2B圖所示，在影像讀取電路2的表面在與載 置有手指FN大致同時在壓力感測器5 0的表面也載置有手 指FN的中節，由手指FN賦予壓力給壓力感測器5 0。此時 ，具有手指FN的指紋的指尖未廣範圍地載置於影像讀取電 路2的接觸表面32a上的情形，因即使在數個位置的壓力 檢測點不施加充分的壓力也成爲在接觸表面3 2 a的面內的 壓力分布不發生偏向的電壓變化，因檢測信號的壓力水平 不達到臨界値，故不進行藉由影像讀取電路2的影像讀取 ，即使不讀入不鮮明的影像也可以。此時因光源1 4不發光 ，故被驗者可注意到無法目視確認光源1 4的光，影像讀取 電路2不進行讀取動作。 - 25- 1252436 據此，因不以充分的力按壓手指FN於影像讀取電路2 ’或不使具有指紋的指尖廣範圍地接觸於影像讀取電路2 的接觸表面3 2 a，故若被驗者注意到影像讀取電路2不進行 指紋讀取動作，則可催促手指FN強烈且廣範圍地將具有指 紋的指尖按壓於影像讀取電路2以及壓力感測器5 0。而且 ’若被驗者以充分的壓力廣範圍地按壓手指FN於壓力感 測器5 0，複數個壓力檢測點之中導通的位置達到預定的數 目的話，檢測信號的壓力水平達到臨界値，觸發信號由比 較電路6 2輸出到驅動電路1 〇，影像讀取電路2開始指紋的 讀取，因可確實地讀取鮮明的指紋影像資料，故可進行正 確的認證。 若手指FN的凸部不充分地附著於影像讀取電路2的接 觸表面32a，則因手指FN與壓力感測器50的表面的接觸 壓力水平比臨界値小，故在此狀態下讀取的話有指紋影像 不鮮明之虞，但若顯示由手指FN賦予壓力感測器5 0的表 面的壓力的檢測信號的位準不爲臨界値以上，則因影像讀 取電路2不進行影像讀取動作，未被充分地按壓，故不爲 所讀取的指紋影像資料爲不鮮明的狀態，相反地若爲壓力 感測器5 0判斷爲手指FN按壓程度的按壓力的話，則影像 讀取電路2對於鮮明的指紋影像可確實地讀取。 此外，若在比較電路62中的臨界値的位準設定上限以 及下限，則僅手指FN與壓力感測器5 0的表面的接觸壓力 爲適切的範圍的情形，影像讀取電路2可進行影像讀取動 作。此情形，藉由強烈地按壓手指FN於影像讀取電路2， -26- 1252436 反而手指F N的凹凸的高低差小，可解除光學地指紋的判別 困難，或指紋成爲失真的影像，無法正確認證。 [第二實施形態] 其次如第6圖〜第8圖所示，針對與第一實施形態的指 紋讀取裝置1不同的指紋讀取裝置1 0 1來說明。 在第二實施形態中，擴散導光板1 5與影像讀取電路2 重疊，朝影像讀取電路2背面的擴散導光板1 5的表面係對 接於影像讀取電路2的背面。 而且在上述第一實施形態中，雖然壓力感測器5 0的表 面與影像讀取電路2的接觸表面32a爲同一平面，但在第 二實施形態中壓力感測器5 0重疊於擴散導光板1 5，壓力感 測器5 0的表面對接於擴散導光板1 5的背面。即指紋讀取 裝置1 〇 1係由下依次以壓力感測器5 0、擴散導光板1 5、影 像讀取電路2的順序堆積而構成。因此，賦予影像讀取電 路2的接觸表面3 2 a的壓力也賦予壓力感測器5 0，使壓力 感測器50可檢測影像讀取電路2的接觸表面32a的壓力。 壓力感測器5 0具備：形成於基板5 6上的互相平行延伸於行 方向的複數條電極線5 1、5 1 ...，與互相平行延伸於列方向 的複數條電極線5 2、5 2…形成於背面的可撓性的薄層材5 5 ，與覆蓋薄層材55的周圍，接合基板56與薄層材55的密 封墊5 4，複數條電極線5 2、5 2…與複數條電極線5 1、5 1 ... 分離，而且以俯視電極線5 2直交於電極線5 1，且使電極線 5 1與電極線5 2面對面而貼合薄層材5 5與基板5 6的構成。 而且，在電極線5 1以及電極線5 2的至少一側的表面配設 -27- 1252436 感壓性墨水層也可以。此情形，在電極線5 1感壓性墨水層 在與電極線5 2的交叉部中重疊而配置。電極線5 1以及電 極線5 2間的電阻係成爲依存於賦予感壓性墨水層的壓力， 右_力的大小變化的話電阻等也會變化的特性。在此壓力 感測器5 0中，藉由電極線5 1與電極線5 2的交叉部中的電 P且等可檢測該交叉部的壓力。 而且，第二實施形態的指紋讀取裝置1 0 1除了第5圖 所不的電路構成外，如第8圖所示也具有調節光源1 4的發 光強度的調節電路102。 此處，檢測電路61輸出顯示藉由壓力感測器5 0檢測 的面內的全體的壓力的水平之檢測信號給比較電路62。比 較電路6 2若是壓力水平識別爲手指的容許範圍內的話，取 代觸發信號輸出該壓力水平的壓力資訊信號給驅動電路1 〇 。驅動電路1 〇依照壓力資訊信號的壓力水平，輸出光源1 4 的發光色調信號給調節電路1 0 2。調節電路1 0 2係以依照發 光色調丨§號的売度使光源1 4發光。即調節電路1 〇 2係依照 壓力水平開始使光源1 4發光，並且根據壓力水平調節供給 光源1 4的電力的位準，以調節光源14的發光強度。而且 ，驅動電路1〇藉由在光源14的發光後輸出控制信號Bent 給底閘極驅動器1 2，適宜輸出read信號給底閘極驅動器1 2 ，藉由輸出控制信號Tent給頂閘極驅動器1 1，適宜輸出重 設信號給頂閘極驅動器1 1，藉由輸出控制信號D cut給資料 驅動器13，適宜輸出pre-charge信號給資料驅動器13。其 中，驅動電路1 〇係被設定爲若是來自比較電路62的壓力 一 28 - 1252436 色調信號以預定的亮度使光源M發光。其中，調節電路ι〇2 根據在發光色調信號的資訊，即隨著在影像讀取電路2的 接觸表面32a的按壓力低或高進行調節以提高光源14的發 光強度。此外，右由檢測電路6 1輸出給調節電路丨〇 2的檢 測信號爲在靜電除去膜3 2未載置有任何東西時的位準以下 ’即未賦予壓力給壓力感測器5 0時的位準以下，則調節電 路102使光源14燈熄。 若光源1 4發光的話，光由擴散導光板1 5經由影像讀 取電路2入射到手指FN，藉由手指FN引起反射、散射。 在位於手指FN的凸部下方的感測器元件2〇，充分的光量 的反射、散射光被入射，惟在位於手指FN的凸部下方的感 測器元件2 0，反射、散射光未充分被入射。 驅動電路1 〇輸出發光色調信號使光源1 4發光後，與 第一實施形態一樣，輸出控制信號給影像讀取電路2的驅 動器1 1、1 2、1 3。而且，依照藉由驅動器1 1、1 2、1 3入射 到影像讀取電路2內的感測器元件20、20…的反射光的強 度之電氣信號經由資料驅動器1 3轉送到驅動電路1 〇，藉由 驅動電路1 〇檢測電氣信號的位準，以取得手指FN的指紋 影像，指紋影像資料輸出到CPU 63。而且，CPU63判定是 否視輸入的指紋影像資料與記憶部66的登錄指紋影像資料 一致。而且，在視指紋影像資料與登錄指紋影像資料一致 的情形下CPU63起動保密模式，在未視指紋影像資料與登 錄指紋影像資料一致的情形下c P u 6 3起動通常模式。 針對本實施形態的功效來說明。 -30- 1252436 隨著由手指FN所產生的壓力小或變小，手指FN的凸 部與接觸表面3 2 a的接觸面積變小，藉由手指FN的凸部不 附著於接觸表面3 2 a，有凸部的反射光爲低強度而入射到半 導體膜2 3之虞。但是，隨著由手指FN所產生的壓力變小 ，光源1 4的發光強度變高，故入射到手指FN的光也變強 ，即使手指FN的凸部不附著於接觸表面3h，凸部的反射 光爲光強度而入射到半導體膜2 3。 而且在由手指FN所產生的壓力大的情形，假設光源1 4 的發光強度強的話，手指FN的凹部的反射光也是高強度而 入射到半導體膜23，入射到感測器元件20、20...的半導體 膜2 3的反射光的面內強度分布大致均等而變亮。但是，隨 著由手指F N所產生的壓力變高，因光源1 4的發光強度低 ，故這種問題也不發生。 因此在本實施形態中，即使由手指FN所產生的壓力爲 任何情形也能以影像讀取電路2鮮明地讀取手指FN的指紋 影像。 而且，第二實施形態的指紋讀取裝置1 0 1也能完成與 第一實施形態的指紋讀取裝置1 一樣的功效。 而且，這種影像輸入裝置可當作門的個人認證系統或 個人電腦等的存取限制用的固體識別影像輸入裝置來應用 ，特別是對像行動電話、筆記型電腦或PDA的小型，功率 消耗或尺寸有限制的攜帶機器特別有效。 此外，第一實施形態的指紋讀取裝置1也與第二實施 形態的指紋讀取裝置1 〇 1 —樣，除了第5圖所示的電路構 -3 1- 1252436 成外，如第8圖所示具有調節光源1 4的發光強度的調節電 路1 0 2也可以。 而且，本發明並非限定於上述各實施形態，在不脫離 本發明的旨趣的範圍中進行種種的改良以及設計的變更也 可以。 在上述各實施形態中雖然讀取手指FN，但不限於手指 FN，按壓其他各種被檢體於靜電除去膜32的接觸表面32a 而讀取也可以。若按壓被檢體於靜電除去膜3 2的接觸表面 3 2 a，則可以影像讀取電路2讀取描繪於被檢體表面的模樣 (包含文字、數字、圖等的意思），或可以影像讀取電路2 讀取由被檢體的表面的凹凸定義的圖案（pattern)。 在上述各實施形態中雖然令載置有被檢體的載置面爲 靜電除去膜32的接觸表面32a，但爲配設於靜電除去膜32 上的絕緣膜的表面也可以，而且，不配設靜電除去膜3 2也 可以。 在上述第二實施形態中的影像讀取電路2的下方配設 有壓力感測器5 0的構造的指紋讀取裝置1 〇 1未必配設如第 8圖的調節電路1 0 2也可以，爲第5圖所示的電路構成也可 以。而且，配設有不與第一實施形態中的影像讀取電路2 重疊而配置的壓力感測器5 0的構造的指紋讀取裝置1未必 爲像第5圖的電路構成也可以，具有第8圖所示的電路構 成也可以。 而且在上述各實施形態中，光電變換元件雖然以使用 感測器元件2 0、2 0…的影像讀取電路2爲例子來說明，但 - 32- 1252436 光電變換元件適用本發明於利用光電二極體的影像讀取電 路也可以。利用光電二極體的影像讀取電路有CCD影像感 測器、CMOS影像感測器。 在C C D影像感測器中，光電二極體係在基板上成矩陣 狀每一像素都形成，在各個光電二極體的周圍形成有傳送(1) The present invention relates to an image reading circuit provided on a mounting surface on which a subject is placed, and the image reading device reads the aforementioned inspection. The image input device that inputs the image of the subject. (II) Prior Art Fingerprints are very useful tools for personal identification because they present a person-specific appearance. In recent years, a fingerprint authentication device that applies fingerprints to personal authentication has been developed. Specifically, the fingerprint authentication device combines the fingerprint image read by the image reading device with the fingerprint image data of the pre-registered registrant into a personal authentication, and is loaded on the PC (P ers ο na 1 C 〇mputer: Information devices such as personal computers), PDAs (Personal Digital Assistants), and mobile phones are reviewed. Japanese Laid-Open Patent Publication No. 2002-94040 discloses a binary image reading device used in a fingerprint authentication device. The secondary image reading device includes a photosensor array in which a plurality of photo sensors are arranged on a transparent substrate, and a photosensor array disposed on the back surface of the photosensor array. A back light, a transparent electrode layer covering the surface of the photosensor array, and a detecting portion for detecting a change in voltage of the electrode layer. According to the operation and the method of use of the conventional binary reading device, since the subject itself has a unique resistance and capacitance, if the subject places the finger on the electrode layer, the finger is contacted by the finger. The characteristic voltage change caused by the electrode layer is detected by the detecting unit, and the backlight is turned on by the finger detection by the detecting unit to illuminate the finger, and the light detecting is performed by the detecting unit performing a finger detection of 5 to 1252436. The array performs an image reading operation to read an image of a finger. The image of the finger read by the photosensor array is a fingerprint image represented by the intensity distribution of the reflected light caused by the unevenness of the finger in the contact surface. (III) SUMMARY OF THE INVENTION However, the sweating state of the finger varies from person to person, and the force of pressing the electrode layer with a finger when placing the finger on the electrode layer varies from person to person. If the sweating state of the finger is different, the characteristic voltage change caused by the finger contacting the electrode layer is different. If the force of pressing the electrode layer is different, the contact area between the finger and the electrode layer is different, and the voltage change of the electrode layer is also different. . Therefore, in the conventional two-dimensional image reading apparatus, if the deviation caused by the individual difference in the sweating state or the tolerance of the deviation of the force by the finger is too narrow, the person places the finger on the electrode layer. Even if the human finger touches the fingerprint image by the detecting unit, the other person cannot detect the finger of the other person by the detecting unit even if the finger is placed on the electrode layer, and the finger cannot be read. Fingerprint images of others. Even if the same person is different in the sweating state or pressing force of the finger, there is a problem that the fingerprint image of the finger cannot be read. Further, when the allowable amount is widened, there is a possibility that the electrode layer is in contact with the electrode layer, and if the allowable amount is widened until the force of the pressing electrode layer is weak, the convex portion of the finger is not closely connected to the electricity. _ layer 'The fingerprint pattern can not be read fluently, there is no possibility of correct authentication. Furthermore, such a weak voltage change makes it difficult to detect with high precision due to noise such as electromagnetic waves in the surroundings. Therefore, the object of the present invention is to provide an image input device which can read a video easily and reliably and can read a clear image. -6 1252 436. In order to solve the above problems, the image input device of the present invention includes: an image reading circuit disposed under a mounting surface on which the subject is placed; and a pressure detection applied to the mounting surface The detection means in which the subject is placed on the placement surface. In the present invention, when the subject is placed on the mounting surface, the pressure is applied to the mounting surface by the subject, and the detecting means detects the placement of the subject by the pressure applied to the mounting surface, so that the subject is inspected. When the body is not placed on the mounting surface, the reading operation of the image reading circuit can be stopped, and when the object is placed on the mounting surface, the reading operation of the image reading circuit can be quickly stopped, so that the uninhibited operation can be suppressed. The power consumption when the specimen is placed on the mounting surface, in order to perform the reading operation, does not require special operations other than placing the finger. Therefore, only the subject can be placed on the placement surface to reliably read the image of the subject. In the case where the finger is applied to the subject, it is conventionally impossible to detect the placement of the finger due to the sweating state of the finger. However, in the present invention, if the finger is placed on the placement surface, pressure is given. Since the surface is placed, the placement of the finger can be reliably detected by the detecting means, and the image of the finger can be reliably read. In the present invention, the detecting means includes: a pressure sensor that detects a pressure applied to the mounting surface; and a threshold 成 that separates the mounted state from the unloaded state by the pressure level detected by the pressure sensor ( Thresh ο 1 dva 1 ue) Comparison, when the threshold 値 is reached, a comparison means for outputting a triggering signal for performing an image reading operation to the image reading circuit. 1252436 When the object is placed on the mounting surface, the pressure is applied to the mounting surface by the subject. However, if the pressure applied to the mounting surface by the subject is small, the contact area between the subject and the mounting surface is small. It is assumed that a clear image cannot be read by reading an image with an image reading circuit. However, if the level (1 eve 1) of the detection signal indicating the pressure applied to the mounting surface by the subject is not critical 値 or more, the comparison means does not output the trigger signal, and the image is read. The circuit does not perform an image reading operation, so no such unclear image is read. When the level of the detection signal indicating the pressure applied to the mounting surface by the subject exceeds the threshold ,, the comparison means outputs a trigger signal, and the image reading circuit performs a video reading operation on the subject and the mounting surface. When the contact area is very large, the image reading circuit reads the image, so that a clear image can be reliably read. In the present invention, the means for adjusting the brightness of the light source that illuminates the subject in accordance with the pressure applied to the mounting surface by the subject is based on the pressure on the mounting surface generated by the subject. The light irradiation intensity of the light source is adjusted. Therefore, light suitable for the strength of the contact area between the subject and the mounting surface is incident on the subject. Therefore, even if the contact pressure caused by the subject is any situation, the image of the subject can be clearly read. Further, the video input device according to the present invention includes: an image reading circuit disposed under a mounting surface on which the subject is placed; and a pressure placed on the mounting surface below the image reading circuit The detecting means for detecting that the subject is placed on the placing surface is in the range of 8 to 1252436. In this configuration, the detecting means for detecting the mounting of the subject can be stopped when the subject is not placed on the mounting surface. The reading operation of the image reading circuit can quickly stop the reading operation of the image reading circuit when the object is placed on the mounting surface, and the image reading is performed by the detecting means. The lower side of the circuit makes it possible to miniaturize the image input device in the opposite direction, and is particularly effective for the authentication device of a device having excellent portability. Further, the video input device of the present invention includes: a detecting means for outputting a detection signal by a pressure on which a finger is placed; and when the finger is placed on the detecting means, disposed under the portion having the fingerprint of the finger, and reading is performed in accordance with a plurality of sensor elements of the image of the unevenness of the finger; and a drive circuit for starting the image reading operation of the plurality of sensor elements by the detection signal. In this way, since a plurality of sensor elements are disposed to be positioned below the portion having the fingerprint of the finger when the finger is placed on the detecting means, the image reading operation can be easily performed, and the finger is not placed on the detecting means. Since the sensor element does not perform the image reading operation, the power consumption can be suppressed. (4) Embodiments The following description will be made with respect to specific aspects of the present invention using the drawings. However, the scope of the invention is not limited to the illustrated examples. [First Embodiment] Fig. 1 is a plan view showing a fingerprint reading device 1 to which a video input device according to the present invention is applied. Figs. 2A and 2B are broken lines (Π)-( A cross-sectional view showing the state in which the finger is not placed and the state in which the finger is placed, -9 to 1252436. Fig. 3 is a cross-sectional view taken along the broken line (m) - (m) of Fig. 1. The fingerprint reading device 1 is configured to read a fingerprint image of the finger FN by converting light reflected by the finger FN placed on the first joint to the tip of the contact surface 32a or by the amount or intensity of the light passing through the finger FN. And the image reading circuit 2 in which the solid-state imaging device of the optical sensor is integrated with the driver thereof, and the driving circuit 10 that acquires the fingerprint image data of the finger FN by detecting the electrical signal from the image reading circuit 2, and a film-type type of light irradiation means for irradiating light to the finger FN placed on the contact surface 3 2 a of the image reading circuit 2 and detecting pressure generated by contact of the finger FN from the second joint to the first joint The pressure sensor 50 and the finger holding portion 16 for holding the finger FN at the predetermined position in the image reading circuit 2 and the pressure sensor 50. First, it will be explained with respect to light irradiation means. The light irradiation means includes a light source 14 such as a light-emitting LED or a cold cathode fluorescent tube, and guides the light emitted from the light source 14 to the image reading circuit 2, and irradiates the finger FN of the subject with the light by the image reading circuit 2. Diffusion light guide plate 15 used. The diffusing light guide plate 15 is slightly flat, and is covered with a light reflecting material except for the side facing the light source 14 and the surface facing the back surface of the image reading circuit 2. The light from the light source 14 is diffused on the surface of the diffusion light guide plate 105, and the light emitted from the surface surface of the diffusion light guide plate 15 is uniformly irradiated on the back surface of the image reading circuit 2. Further, instead of the diffusion light guide plate 15 and the light source 14, the surface light-emitting element such as an organic EL element may be disposed facing the back surface of the image reading circuit 2. Next, the image reading circuit 2 will be described using Figs. 1 to 4 to -10- 1252436. Fig. 4A is a plan view showing a pixel of the image reading circuit 2, and Fig. 4B is a cross-sectional view showing a broken line (IV B ) - (IV B ) of Fig. 4A. The video reading circuit 2 includes a substantially flat transparent substrate 17 and a plurality of N-shaped arrays of n rows and m columns (n and m are integers) arranged on one surface of the transparent substrate 17 A photo sensor element (hereinafter referred to as a sensor) 20, 20 formed by a channel type double gate type transistor. . . And a top gate driver (top gate driVe〇l1, bottom gate driver 12) formed on the surrounding transparent substrate 17 formed on the image input area 8 in which the sensor elements 20, 20, . A data driver 13, and a protective insulating film 315 for covering the drivers 1 1 , 12 , 13 and the sensor elements 20 , 20 , . . . , are formed on the protective insulating film 31 . The substrate 17 has transparency to light in a wavelength range detectable by the sensor element 20 among light emitted from the light source 14 (hereinafter simply referred to as light transmissivity), and has insulating properties, such as quartz glass. a plastic substrate such as a substrate or a polycarbonate. The transparent substrate 17 constitutes the back surface of the image reading circuit 2, and the diffusing light guide plate 15 is formed on the transparent substrate 17°. The photoelectric conversion element of the pixel includes: a bottom gate electrode 21 formed on the transparent substrate 17, a bottom gate insulating film 22' formed on the bottom gate electrode 21, and a bottom gate electrode 21 Bottom gate insulating film 22, and The semiconductor film 23 of the bottom gate electrode 21 and the channel protective film 24 made of tantalum nitride formed on the central portion of the semiconductor film 23 are separated from each other at both end portions of the semiconductor film 23 to form -11. The impurity semiconductor films 25 and 26 of 1252436, the source electrode 27 formed on the impurity semiconductor film 25, and the drain electrode 28 formed on the impurity semiconductor film 26 are formed on the source The electrode 27 and the top gate insulating film 29 on the germanium electrode 28, and the top gate electrode 30 〇 sandwiching the semiconductor film 23 and the top gate insulating film 29 and the channel protective film 24, and facing the semiconductor film 23. On the transparent substrate 17, the bottom gate electrode 21 is formed in a matrix shape for each of the sensor elements 20. Further, n bottom gate lines 4 1 extending in the lateral direction are formed on the transparent substrate 17. 4 1... The bottom gate electrode 2 1 of each sensor element 20 arranged in the same row in the lateral direction is formed integrally with the common bottom gate line 4 1 . The bottom gate electrode 2 1 and the bottom gate line 41 Conductive and opaque, made of, for example, chromium, chrome, aluminum or aluminum Gold or an alloy of these elements. A bottom gate insulating film 22 common to all of the sensor elements 20, 20, ... is formed on the bottom gate electrode 2 1 and the bottom gate line 4 1. The bottom gate insulating film 22 has insulation. The light transmittance is composed of, for example, tantalum nitride or hafnium oxide. On the bottom gate insulating film 2 2 , a semiconductor film 2 3 is formed for each of the sensor elements 20 . The semiconductor film 23 has a substantially rectangular shape in plan view, and forms a layer of an amorphous silicon or a polysilicon which is an electron-hole pair if light of a predetermined wavelength range is incident. A channel protective film is formed on the semiconductor film 23. The channel protective film 24 has a function of protecting the interface of the semiconductor film 23 from the etchant used for patterning (insulation and light transmission). 'Consisting of, for example, tantalum nitride or hafnium oxide. When light is incident on the semiconductor film 23, an electron-hole pair in accordance with the amount of incident light is generated at the center in the vicinity of the interface between the channel protective film 24 and the semiconductor film 23. The holes in the generated carriers are held in the semiconductor film 23 or the channel protective film 24 in accordance with the electric field of the bottom gate electrode 21 and the top gate electrode 30. On one end portion of the semiconductor film 23, a part of the impurity semiconductor film 25 is formed to overlap the channel protective film 24. On the other end portion of the semiconductor film 23, a part of the impurity semiconductor film 26 is overlapped with the channel protective film 24 to form a portion. . The impurity semiconductor films 25, 26 are each patterned in a pattern of each of the sensor elements 20. The impurity semiconductor films 25 and 26 are composed of amorphous germanium (η + 矽) containing n-type impurity ions. A source electrode 27 in which each of the sensor elements 20 is patterned is formed on the impurity semiconductor film 25. A germanium electrode 28 in which each of the sensor elements 20 is patterned is formed on the impurity semiconductor film 26. Moreover, m reference voltage lines 42, 42 ... extending in the longitudinal direction and data lines 43, 43. . . The source electrode 27 of each of the sensor elements 20 arranged in the same row in the longitudinal direction is formed integrally with the common reference voltage line 42 and is arranged in the same column in the longitudinal direction. The germanium electrode 28 of the detector element 20 is formed integrally with the common data line 43. The source electrode 27, the ytterbium electrode 28, the reference voltage line 42, and the data line 43 have electrical conductivity and light blocking properties, and are composed of, for example, a complex alloy, a bromine or an alloy or an alloy of a suitable halogen. Formed on the channel protection film 24, the source electrode 27, and the germanium electrode 28 and the reference voltage lines 4 2, 4 2 ... and the data lines 4 3, 4 3 ... of all of the sensor elements 20, 20... There are common sensor elements 2 0, 2 0 . . . The top gate insulating film 29. The top gate insulating film 29 has an insulating property and a light transmissive property, and is composed of, for example, 13- 1252436 such as tantalum nitride or hafnium oxide. A top gate electrode 30 in which each of the sensor elements 20 is patterned is formed on the top gate insulating film 29. Further, n top gate lines 44 extending in the lateral direction are formed on the top gate insulating film 29, and the top gate electrodes 30 of the respective sensor elements 20 arranged in the same row in the lateral direction are common to The top gate line 4 4 is integrally formed. The top gate electrode 30 and the top gate line 44 are electrically conductive and light transmissive, such as indium oxide, zinc oxide or tin oxide or a mixture comprising at least one of these compounds (eg, tin-doped indium oxide (ΙΤΟ) ) or zinc-doped indium oxide). The sensor element 20 constructed as above is a photoelectric conversion element in which the semiconductor film 23 is used as a light receiving portion. The top gate electrode 30 and the top gate line 44, 44 of all of the sensor elements 20, 20... The common protective insulating film 31 is formed in contact with the top gate electrode 30 and the top gate line 44. The protective insulating film 31 has insulating properties and light transmissivity and is composed of tantalum nitride or hafnium oxide. The electrostatic removal film 32 is formed on one side of the protective insulating film 31. The static electricity removing film 32 has conductivity and light transmittance, for example, indium oxide, zinc oxide or tin oxide or a mixture containing at least one of these compounds (for example, tin-doped indium oxide (IT 0), zinc-doped Indium oxide) is formed. The static electricity removing film 32 is grounded and held at 0 (V) by removing static electricity from the finger FN to prevent the sensor element 20, 20... or the top gate driver 1 1 and the bottom gate driver 1 2 The driver 13 is broken by static electricity. The contact surface 3 2a of the static electricity removing film 3 2 is the surface of the image reading circuit 2 that the finger FN is in contact with - 14524536. In the above image reading circuit 2, the diffusing light guide plate 15 is incident on the transparent substrate 17 The light is shielded by the bottom gate electrode 2 1 and is not directly incident on the semiconductor film 23. Further, since the bottom electrode 2 1 is not formed between the sensor elements 20, 20, ..., the light incident on the transparent substrate 17 by the diffusing light guide plate 15 is transmitted through the sensor elements 20, 2, The surface of the image reading circuit 2 is emitted to the outside. The driver of the image reading circuit 2 will be described. As shown in Fig. 1, the reference voltage lines 42, 42 are maintained at a constant voltage, for example, grounded at 0 (V). The bottom gate lines 41, 41 are connected to the output of the bottom gate driver 12. The top gate lines 44, 44... are connected to the output of the top gate driver 11. The top-of-the-line driver 1 1 is a shift register (S hift register), in the order of the top gate line 44 of the first row to the top gate line 44 of the n-th row (when the ηth row is reached, the first step is returned as needed) At a glance) the output reset signal. When the reset signal is output to the top gate line 44 of a certain row, the top gate line 44 becomes a high level reset potential for removing the holes stored in the semiconductor film 23 and the channel protective film 24, when the reset signal is not When outputting to the top gate line 44 of a certain row, the top gate line 44 and the top gate electrode 30 connected to the top gate line 44 are formed to hold electron-holes generated by light incident on the semiconductor film 23. The potential of the low-level carrier of the middle hole is stored. The bottom driver 1 2 is a shift register, in the order of the bottom gate line 4 1 of the first row to the bottom gate line 4 1 of the η row (when the ηth row is reached, the first row is returned as needed) ) Output a high level of read signal. When the read signal is output to the bottom gate line 4 1 of a certain row, the bottom gate line 41 and the bottom gate electrode 2 1 connected to the bottom gate line 4 1 form a channel -15- formed in the semiconductor film 23. The read potential of 1252436, the size of the area of the channel depends on the amount of light incident on the semiconductor film 23. After the top gate driver 11 outputs the reset signal to the top gate line 44 of any integer of the ith behavior 1 to 11, the bottom gate driver 12 outputs a read signal to the bottom gate line 4 of the ith row. The top gate driver 1 1 and the bottom gate driver 12 are offset from the output signal. The data driver 13 is connected to all of the data lines 43, 43 between the output reset signal and the output re ad signal. • Outputs a pre-charge signal at a predetermined level (high level). Further, the data driver 13 amplifies the voltages of the data lines 43, 43 ... after the output of the pre-charge signal, and outputs it to the drive circuit 10 . Next, the description will be given for the drive circuit 10. The driving circuit 10 outputs the read signal to the bottom gate driver 1 2 by outputting the control signal Bent, and outputs the control signal Tent to the top gate driver 1 1 with a suitable output reset signal. The top gate driver 1 1 supplies the data driver 13 with a suitable output pre-charge signal to the data driver 13 by outputting the control signal Dent. Moreover, the driving circuit 10 reaches the predetermined threshold voltage by detecting the voltage of the data lines 43, 43... after a predetermined time elapses after outputting the read voltage, or by detecting the output read voltage and the voltage of the data lines 43, 43 . . . The time until the threshold voltage is obtained to obtain the fingerprint image of the finger FN. Next, it is explained for the pressure sensor 50. The pressure sensor 50 shown in FIG. 2A is disposed adjacent to the image reading circuit 2 on the transparent substrate 17, and is formed in parallel with each other on the transparent substrate 17 and extends in the row direction. The plurality of electrode lines 5 1 , 5 1 , ... and the plurality of electrodes are provided on the plurality of electrode lines 5 1 , 5 1 . . . Between the electrode lines 5 1 high spacers (SpaCe 〇 53, 53. . . a plurality of flexible electrode sheets 52, 52, which are formed in parallel with each other in the column direction, are formed on the back side of the flexible sheet material 55, covering the periphery of the thin material 5 5, and bonding the transparent substrate 17 and the thin layer The seal 54 of the material 5 5 is a plurality of electrode lines 52, 52 ... by a spacer 53 and a plurality of electrode lines 5 1 , 5 1 . . . Separatingly, the electrode line 52 is orthogonal to the electrode line 51 in a plan view, and the electrode line 51 and the electrode line 52 are faced to face each other to bond the thin layer 5 5 and the transparent substrate 17 . Spacer 5 3, 5 3 . . . A plurality of electrode lines 5 2, 5 2 are disposed in the back surface of the thin layer 5 5 . . . Configuration is also possible. Further, after repeatedly pressing the pressure sensor 50 with a finger, if there are a plurality of electrode lines 5 1 and 5 1 in an unpressed state. . . And a plurality of electrode lines 5 2 , 52. . . The spacer 53 is not necessarily required if sufficient restoring power is available. At least one of the electrode line 51 and the electrode line 52 of the pressure sensor 50 outputs a voltage by a detection circuit 6 1 to be described later. If the finger FN is placed on the image reading circuit 2 as shown in FIG. 2B Further, on the pressure sensor 50, the thin layer material 5 is bent by the pressing force of the finger FN, and accordingly, the electrode line 52 is bent in contact with the electrode line 51. At this time, since the electrode line 5 1 and the electrode line 5 2 are turned on, the electric current flowing through the electrode line 51 and the electrode line 52, or the electric characteristics of at least one of the electrode line 51 and the electrode line 52, or the electric resistance 値, etc. Variety. The change in the characteristics of the electrical system is such that the finger FN is proportional to the force of the pressing pressure sensor 50. Therefore, if the detecting circuit 61 reads the electrical characteristic change of the degree that the finger FN sufficiently presses the pressure sensor 50, the judgment is made. 1252436 The tip of the finger FN is placed on the image reading circuit 2, and the light source 14 starts the reading operation of the image reading circuit 2. In order to prevent the finger fn from sufficiently pressing the pressure sensor 50, in a state where the finger FN is not sufficiently attached to the image-following circuit 2, since the change in electrical characteristics is small, the drive circuit j does not perform the image reading circuit. 2 read action. Therefore, due to insufficient adhesion, not only the shadow of the fingerprint of the finger FN that the image reading circuit 2 does not read is an unclear image, but since the light source 14 does not emit light, the subject is rejected without being authenticated but is perceptible. It is not enough to press the finger FN. Therefore, the subject sufficiently presses the finger FN to the pressure sensor 50 and the image reading circuit 2 to drive the circuit 10 to perform the reading operation of the image reading circuit 2, so that a clear image can be read and authentication can be easily performed. The pressure sensor 50 may be provided with a pressure-sensitive ink layer on at least one surface of the electrode line 5 1 and the electrode line 5 2 . In this case, the electrode layer 5 1 is disposed so that the pressure-sensitive ink layer overlaps at the intersection with the electrode line 52. The resistance between the electrode line 5 1 and the electrode line 5 2 becomes dependent. The pressure applied to the pressure-sensitive ink layer changes if the magnitude of the pressure changes. In this pressure sensor 50, the pressure at the intersection can be detected by a resistance or the like in the intersection of the electrode line 51 and the electrode line 52. Further, since the pressure sensor 50 is arranged in a matrix in the cross section in a plan view, the detection circuit 6 1 measures the change in the electrical characteristics of the electrode line 51 or the electrode line 5 2 of each intersection. The pressure distribution in the surface can be detected, and the pressure in the entire surface can be detected. Wherein, when the detection circuit 6 1 detects that the pressure distribution in the plane is substantially equal, the pressure sensor 50 determines that the portion of the fingerprint having the tip of the finger FN is unevenly placed on the image reading circuit 2, the light source 1 4 Irradiation -18 - 1252436 The light starts the reading operation of the image reading circuit 2. On the other hand, the unevenness of the pressure distribution in the plane is remarkably biased to one side, and since the portion of the fingerprint having the tip of the finger FN does not have uneven contact with the image reading circuit 2, the light source 14 does not. The reading operation of the image reading circuit 2 is not started by the irradiation light. As shown in Fig. 1, the pressure sensor 50 and the image reading circuit 2 are disposed at mutually different positions in a plan view (see the contact surface 32a of the image reading circuit 2). Specifically, the pressure sensor 50 is disposed adjacent to the image reading circuit 2, and the surface of the pressure sensor 50 and the contact surface 3 2a of the image reading circuit 2 are in the same plane, and the surface of the pressure sensor 50 It is also a mounting surface on which the finger FN is placed. Next, the finger holding unit 16 will be described. The finger holding portion 16 is formed with a finger-shaped opening portion 16a that is opened from the tip end of the finger FN to the second joint, and the finger holding portion 16 is attached to the contact surface 3 2 a of the image reading circuit 2 and the pressure feeling The surface of the detector 50 is exposed to the image input region 8 in which the sensor elements 20, 20, ... and the pressure detecting region where the intersection of the electrode wire 51 and the electrode wire 52 are arranged is exposed. The opening of the finger holding portion 16 corresponding to the distal end of the finger is disposed in the image input area 8. Next, the circuit configuration of the fingerprint reading device 1 will be described using Fig. 5. As shown in FIG. 5, the fingerprint reading device 1 includes a detection circuit 61, a comparison circuit 62, a CPU 63, a RAM 64, a ROM 65, and a self-explanatory in addition to the image reading circuit 2, the drive circuit 10, and the pressure sensor 50. Recalling part 66. - 1 9 - 1252436 The detection circuit 6 1 drives the pressure sensor 5 Ο to input and output the electrical characteristics of the signal of at least one of the electrode line 5 1 and the electrode line 5 2 of the pressure sensor 50, and the output shows The detection signal of the level of the entire pressure in the plane detected by the pressure sensor 50 is supplied to the comparison circuit 62. Further, the detecting circuit 6 1 outputs the pressure distribution data indicating the pressure distribution detected by the pressure sensor 50 to C P U 6 3 . The comparison circuit 62 receives the detection signal from the detection circuit 61, and compares the level of the detection signal with respect to the threshold 分隔 separating the finger placement state from the finger unmounted state, and outputs a trigger signal to the case where the level of the detection signal exceeds the critical threshold. Drive circuit 1 〇. The detecting means for detecting that the finger FN is placed on the contact surface 32a of the image reading circuit 2 by the pressure applied to the surface of the pressure sensor 50 is constituted by the above pressure sensor 50, the detecting circuit 61, and the comparing circuit 62. The drive circuit 1 first outputs a signal for causing the light source 14 to emit light in the case where the trigger signal is input by the comparison circuit 62 to cause the light source 14 to emit light. Moreover, the driving circuit 1 outputs a control signal Bent to the bottom gate driver 12 after the light source 14 is illuminated, outputs a control signal Tent to the top gate driver 1 1 , and further outputs a control signal group Dent to the data driver 13. According to this, the image reading circuit 2 starts to operate. By the operation of the image reading circuit 2, the fingerprint image of the finger FN is acquired by the drive circuit 1 and the data of the fingerprint image is output to the CPU 63. Each of the registrants in the storage unit 66 stores the registered fingerprint image data of the last section of the finger. Further, the memory unit 66 has a data storage area for storing various kinds of data outside the area in which the fingerprint image data is stored. The data storage area -20-1252436 is composed of a specific area and a normal area. The registered video data may be data indicating a relative position of a plurality of feature points extracted by the fingerprint, and may be an image. A program executable to the CPU 63 is stored in the ROM 65. The CPU 63 uses the RAM 64 as a work area, inputs the fingerprint image data by the drive circuit 1 according to the program stored in the ROM 65, or inputs the pressure distribution data by the detection circuit 61, or determines whether the load is placed under pressure by the input pressure distribution data. The surface of the sensor 50 is the middle section of the finger or the case where it is determined that the surface of the pressure sensor 50 is the middle section of the finger. By comparing the fingerprint image data input by the driving circuit 1 与The login fingerprint image data stored in Jiyue 66 is determined to determine whether the fingerprint image data is consistent with the login fingerprint image data. Furthermore, the C P U 6 3 activates the secret mode in the case where the fingerprint image data and the registered fingerprint image data match, and the normal mode is started without the fingerprint image data being identical to the registered fingerprint image data. The operation and the method of use of the fingerprint reading device 1 of the present embodiment will be described. When the surface of the pressure sensor 50 is not in contact with anything, 'the level of the detection signal indicating the total pressure in the surface detected by the pressure sensor 50 is not full, so the comparison circuit 6 2 The trigger signal is output to the drive circuit 10. The other aspect is such that the end of the finger FN is placed on the contact surface 3 2 a of the static electricity removing film 3 2 while the middle portion of the finger FN is placed on the pressure sensor 50. In the case of the surface, the light source 14 emits light. The light emitted from the diffuser-2 1- 1252436 light guide plate 15 is incident on the finger FN via the image reading circuit 2, and the reflected light reflected by the finger FN is incident on the sensor element 20, 2 The semiconductor film 23 of 0... The in-plane intensity distribution of the reflected light of the semiconductor film 23 incident on the sensor elements 20, 20, ... is based on the unevenness along the finger FN. The light from the light source 14 that is incident on the convex portion of the finger FN attached to the contact surface 32a propagates in the skin of the finger FN, and finally scatters toward the sensor element 20 located below the convex portion. This scattered light is incident on the semiconductor film 23 of the sensor element 20 at a high intensity to generate an electron-hole pair. In contrast, in the concave portion of the finger FN separated by the contact surface 32a, after the space between the concave portion and the contact surface 32a is taken in, the diffuse reflection is repeated between the concave portion and the space to be attenuated, so that the sensor is below the concave portion. The light of the semiconductor film 23 of the element 20 is not sufficiently reflected, and the electron-hole pair is not sufficiently generated. However, since the middle portion of the finger FN is not placed on the pressure sensor 50, the pressure is applied to the pressure sensor 50 by the finger FN. If the pressure at this time is sufficiently pressed by the finger FN, the plurality of pressure detecting points located at the intersections of the electrode lines 5 1 , 5 1 . . . of the pressure sensor 50 and the electrode lines 5 2, 5 2 . Several turns on, producing a potential change. Further, if the position of the plurality of pressure detecting points reaches a predetermined number, the pressure level of the detection signal reaches the critical value, and the comparison circuit 62 outputs a trigger signal to the driving circuit 10. The drive circuit 10 that inputs the trigger signal by the comparison circuit 62 first outputs a signal for causing the light source 14 to emit light, and the light source 14 illuminates the light toward the contact surface 32a. The driver's drive circuit 10 outputs a control signal T c n t to the top gate driver 1 1 ' to output a control signal Bent to the bottom gate driver 12, and further outputs a control -22-1252336 signal Dent to the data driver 13. The sensor elements 20, 20 of a predetermined row in the image reading circuit 2. . . The reset signal composed of the relatively positive voltage from the top gate driver 1 1 is applied to the top gate electrode 30, and the holes stored in the semiconductor film 23 and the channel protective film 24 are discharged until then. Next, the top gate electrode 30 is applied to _ 20 (V), and the bottom gate electrode 21 becomes 0 (V), and reading of the reflected light by the unevenness of the finger FN constituting the fingerprint is started. Since the convex portion of the finger FN contacts the contact surface 32a, the light from the light source 14 is efficiently incident on the semiconductor film 2 of the sensor element 20 located below, and a large number of electron-hole pairs are generated. At this time, by the negative electric field applied to the top gate electrode 30, only the positively charged hole is trapped in the semiconductor layer 23 and the channel protective film 24, and the electrons are thus negatively charged and repelled to the sensor element. Outside of 20. On the other hand, since the concave portion of the finger FN does not contact the contact surface 3 2 a, the light from the light source 14 is diffusely reflected by the space of the low refractive index between the concave portion and the contact surface, so that the light from the light source 14 is not The semiconductor film 23' incident on the sensor element 20 located below is not sufficiently stored in the semiconductor film 23 and the channel protective film 24. Further, the data driver 13 outputs a high-level precharge (p r e - c h a r g e) signal to all of the data lines 43, 43 ... to hold the data lines 4 3, 4 3 ... at a predetermined voltage. The bottom gate driver 1 2 applies a voltage of + 1 〇 (v) to the bottom electrode 2 1 ° after applying a -2 0 (V) to the top gate electrode 30 for a predetermined time. 'At the recess located in the finger FN In the lower sensor element 20 and the sensor element 20 below the portion where the finger FN is not placed, 'because sufficient light is not incident into the -23-1252436, in the semiconductor film 23 and the channel Since the protective film 24 is not stored with a hole, the electric field generated by the voltage from +1 〇 (V) of the bottom gate electrode 21 which is intended to form a channel in the semiconductor film 23 is caused by the top gate electrode 3 from the gate electrode 3 which is intended to cause the channel to disappear. The electric field generated by the voltage of -2 0 (V) is cancelled, and since the depletion layer is enlarged in the semiconductor film 23, the current does not flow between the source and the drain, and the pre-charge voltage of the data line 43 is intact. maintain. In contrast, since the sensor element 20 located below the convex portion of the finger FN is not sufficiently incident due to the reflected light from the light source 14, the semiconductor film 23 and the channel protective film 24 are stored with holes. This hole has a function of attracting an electric field of -20 (V) at the top gate electrode 3 , while offsetting the negative electric field of the top gate electrode 30 in accordance with the amount of charge thereof. Therefore, when the bottom gate electrode 21 is 0 (V), the channel is not formed, but if the bottom gate electrode 21 is turned to +1 〇 (V), the electric field generated by the bottom gate electrode 21 and the positive electric field generated by the stored hole are generated. It is larger than the negative electric field of the top gate electrode 30, and a channel is formed in the semiconductor layer 23. Therefore, the current does not flow from the drain electrode 28 which is brought to a high potential by the pre-charge voltage to the ground source electrode 27, and the potential of the data line 43 is low. The data driver 13 reads the potential drop of the data lines 43, 43, ... which are inferior by the presence or absence of the incidence of light, and can detect the convex portion or the concave portion of the finger. The above-described operation of the output of the reset signal to the potential of the data lines 4 3, 4 3 ... is sequentially performed for each line. Further, the CPU 63 determines whether or not the fingerprint image data input from the sensor elements 2, 2, ... coincides with the registered fingerprint image data of the storage unit 66. Moreover, the CPU 63 activates the privacy mode in the case where the fingerprint image data matches the registered fingerprint image data. The secret mode refers to the mode in which the C p u 6 3 can be divided in the special area of the memory unit 6 6 - 24 to 1252436 and the normal area access or door lock (d ο o r 1 o c k). On the other hand, the CPU 63 activates the normal mode without considering that the fingerprint image data matches the registered fingerprint image data. The normal mode refers to a mode in which the CPU 63 can be accessed in a normal area of the storage unit 66 and cannot be accessed in a specific area or a door lock or the like is not released. The effect of the present embodiment will be described. Among the fingers FN, the first joint to the tip end are placed on the contact surface 32a of the image reading circuit 2, and the second joint to the first joint are only placed on the surface of the pressure sensor 50, and the finger can be confirmed. The placement of the fingerprint image is started. In this manner, after the finger is placed at the predetermined position, the button for starting the fingerprint authentication is pressed with a different finger, so that the subject can start the reading easily without performing the two steps. Further, if the finger FN is not placed, the image reading circuit 2 does not operate, so that power consumption can be suppressed. Further, as shown in FIG. 2B, the surface of the image reading circuit 2 is placed on the surface of the pressure sensor 50 at the same time as the finger FN is placed, and the finger FN is applied to the middle portion of the pressure sensor 50. Pressure sensor 50. At this time, the fingertip of the fingerprint having the finger FN is not placed on the contact surface 32a of the image reading circuit 2 in a wide range, and the contact is made even if a sufficient pressure is not applied to the pressure detecting points at a plurality of positions. The pressure distribution in the in-plane of the surface 3 2 a does not change in the bias voltage, and since the pressure level of the detection signal does not reach the critical level, the image reading by the image reading circuit 2 is not performed, even if an unclear image is not read. Also. At this time, since the light source 14 does not emit light, the subject can notice that the light of the light source 14 cannot be visually recognized, and the image reading circuit 2 does not perform the reading operation. - 25- 1252436 According to this, since the finger FN is not pressed with sufficient force to the image reading circuit 2' or the fingertip having the fingerprint is not widely contacted with the contact surface 3 2 a of the image reading circuit 2, When the subject notices that the image reading circuit 2 does not perform the fingerprint reading operation, the finger FN can be urged to strongly and widely press the fingertip having the fingerprint to the image reading circuit 2 and the pressure sensor 50. Moreover, if the subject presses the finger FN to the pressure sensor 50 with sufficient pressure and the position of the plurality of pressure detection points reaches a predetermined number, the pressure level of the detection signal reaches a critical threshold, and the trigger is triggered. The signal is output from the comparison circuit 62 to the drive circuit 1 〇, and the image reading circuit 2 starts reading the fingerprint, so that the clear fingerprint image data can be reliably read, so that the correct authentication can be performed. If the convex portion of the finger FN is insufficiently attached to the contact surface 32a of the image reading circuit 2, since the contact pressure level of the finger FN and the surface of the pressure sensor 50 is smaller than the threshold, the reading is performed in this state. If the fingerprint image is not sharp, if the level of the detection signal indicating the pressure applied to the surface of the pressure sensor 50 by the finger FN is not more than the threshold ,, the image reading circuit 2 does not perform the image reading operation. If the fingerprint image data is not in a clear state, the image reading circuit 2 is not clear if the pressure sensor 50 determines that the pressure of the finger FN is pressed. The fingerprint image can be read reliably. Further, if the upper limit and the lower limit of the threshold level in the comparison circuit 62 are set, only the contact pressure between the finger FN and the surface of the pressure sensor 50 is in a suitable range, and the image reading circuit 2 can perform image processing. Read action. In this case, by strongly pressing the finger FN on the image reading circuit 2, -26-1252436, the height difference of the unevenness of the finger FN is small, the discrimination of the optical fingerprint can be canceled, or the fingerprint becomes a distorted image, and the image cannot be correctly authenticated. . [Second Embodiment] Next, as shown in Figs. 6 to 8 , a fingerprint reading device 1 0 1 different from the fingerprint reading device 1 of the first embodiment will be described. In the second embodiment, the diffusion light guide plate 15 overlaps the image reading circuit 2, and the surface of the diffusion light guide plate 15 facing the back surface of the image reading circuit 2 is in contact with the back surface of the image reading circuit 2. Further, in the first embodiment, the surface of the pressure sensor 50 is flush with the contact surface 32a of the image reading circuit 2, but in the second embodiment, the pressure sensor 50 overlaps the diffusing light guide. 15 5, the surface of the pressure sensor 50 is butted against the back surface of the diffusing light guide plate 15. That is, the fingerprint reading device 1 〇 1 is configured by stacking the pressure sensor 50, the diffusion light guide plate 15, and the image reading circuit 2 in this order. Therefore, the pressure applied to the contact surface 3 2 a of the image reading circuit 2 is also imparted to the pressure sensor 50, so that the pressure sensor 50 can detect the pressure of the contact surface 32a of the image reading circuit 2. The pressure sensor 50 has a plurality of electrode lines 5 1 and 5 1 formed on the substrate 56 and extending in parallel with each other in the row direction. . . a plurality of electrode lines 5 2, 5 2 ... extending parallel to each other in the column direction, a flexible thin layer 5 5 formed on the back surface, and a periphery of the cover sheet 55, bonding the substrate 56 and the thin layer 55 a gasket 5 4 , a plurality of electrode lines 5 2, 5 2 ... and a plurality of electrode lines 5 1 , 5 1 . . . The separation is performed, and the electrode line 5 2 is orthogonal to the electrode line 51, and the electrode line 5 1 and the electrode line 5 2 are faced to face each other to bond the thin layer 5 5 and the substrate 56. Further, a pressure-sensitive ink layer of -27 to 1252436 may be disposed on at least one surface of the electrode wire 51 and the electrode wire 52. In this case, the electrode line 51 is disposed so that the pressure-sensitive ink layer overlaps with the intersection of the electrode lines 52. The electric resistance between the electrode line 5 1 and the electrode line 5 2 is a characteristic depending on the pressure applied to the pressure-sensitive ink layer, and the electric resistance or the like changes when the magnitude of the right-force changes. In this pressure sensor 50, the pressure of the intersection can be detected by the electric P in the intersection of the electrode line 51 and the electrode line 52 and the like. Further, the fingerprint reading device 100 of the second embodiment has an adjustment circuit 102 for adjusting the light-emission intensity of the light source 14 as shown in Fig. 8 in addition to the circuit configuration of Fig. 5. Here, the detection circuit 61 outputs a detection signal indicating the level of the entire pressure in the plane detected by the pressure sensor 50 to the comparison circuit 62. The comparison circuit 6 2 outputs a pressure information signal of the pressure level to the drive circuit 1 if the pressure level is recognized as being within the allowable range of the finger. The driving circuit 1 outputs the illuminating tone signal of the light source 14 to the adjusting circuit 102 in accordance with the pressure level of the pressure information signal. The adjustment circuit 1 0 2 causes the light source 14 to emit light in accordance with the intensity of the luminescent color 丨 § . That is, the adjustment circuit 1 〇 2 starts to illuminate the light source 14 in accordance with the pressure level, and adjusts the level of the electric power supplied to the light source 14 in accordance with the pressure level to adjust the luminous intensity of the light source 14. Moreover, the driving circuit 1 outputs a control signal Bent to the bottom gate driver 12 after the light source 14 is illuminated, and outputs a read signal to the bottom gate driver 1 2, and outputs the control signal Tent to the top gate driver 1 1. The appropriate output reset signal is applied to the top gate driver 1 1. By outputting the control signal Dcut to the data driver 13, the pre-charge signal is appropriately outputted to the data driver 13. Here, the drive circuit 1 is set such that the pressure from the comparison circuit 62 is 28 - 1252436. The tone signal causes the light source M to emit light with a predetermined brightness. Here, the adjustment circuit ι2 is adjusted according to the information on the illuminating tone signal, that is, as the pressing force at the contact surface 32a of the image reading circuit 2 is low or high to increase the light-emitting intensity of the light source 14. Further, the detection signal output from the detection circuit 6-1 to the adjustment circuit 丨〇2 is below the level at which the static electricity removal film 32 is not placed, that is, when the pressure is not applied to the pressure sensor 50. Below the level, the conditioning circuit 102 causes the light source 14 to turn off. When the light source 14 emits light, the light is incident on the finger FN by the diffusion light guide plate 15 via the image reading circuit 2, and is reflected and scattered by the finger FN. In the sensor element 2 located below the convex portion of the finger FN, a sufficient amount of reflected and scattered light is incident, but the sensor element 20 located below the convex portion of the finger FN is insufficiently reflected or scattered. Being incident. The drive circuit 1 outputs a light-emitting tone signal to cause the light source 14 to emit light, and outputs a control signal to the drivers 1 1 , 2 2, and 13 of the image reading circuit 2 as in the first embodiment. Further, an electrical signal according to the intensity of the reflected light of the sensor elements 20, 20, ... which is incident on the image reading circuit 2 by the driver 1 1 , 12 2 , 1 3 is transferred to the drive circuit 1 via the data driver 13 The driving circuit 1 detects the level of the electrical signal to obtain the fingerprint image of the finger FN, and the fingerprint image data is output to the CPU 63. Further, the CPU 63 determines whether or not the input fingerprint image data matches the registered fingerprint image data of the storage unit 66. Moreover, the CPU 63 activates the privacy mode in the case where the fingerprint image data and the registered fingerprint image data match, and the normal mode is started when the fingerprint image data is not identical to the registered fingerprint image data. The effect of the present embodiment will be described. -30- 1252436 As the pressure generated by the finger FN is small or small, the contact area of the convex portion of the finger FN with the contact surface 3 2 a becomes small, and the convex portion of the finger FN does not adhere to the contact surface 3 2 a The reflected light having the convex portion is incident on the semiconductor film 23 at a low intensity. However, as the pressure generated by the finger FN becomes smaller, the light-emission intensity of the light source 14 becomes higher, so the light incident on the finger FN also becomes stronger, even if the convex portion of the finger FN does not adhere to the contact surface 3h, the convex portion The reflected light is incident on the semiconductor film 23 as light intensity. Further, in the case where the pressure generated by the finger FN is large, it is assumed that the light intensity of the light source 14 is strong, and the reflected light of the concave portion of the finger FN is also high intensity and is incident on the semiconductor film 23, and is incident on the sensor elements 20, 20. . . The in-plane intensity distribution of the reflected light of the semiconductor film 23 is substantially equal and bright. However, as the pressure generated by the finger F N becomes higher, such a problem does not occur because the light-emitting intensity of the light source 14 is low. Therefore, in the present embodiment, even if the pressure generated by the finger FN is any case, the fingerprint image of the finger FN can be clearly read by the image reading circuit 2. Further, the fingerprint reading apparatus 100 of the second embodiment can also perform the same functions as the fingerprint reading apparatus 1 of the first embodiment. Moreover, such an image input device can be applied as a personal identification system for a door or a solid identification image input device for access restriction of a personal computer or the like, particularly for small size, power consumption of a mobile phone, a notebook computer or a PDA. It is especially effective to carry a machine with limited size. Further, the fingerprint reading device 1 of the first embodiment is also the same as the fingerprint reading device 1 of the second embodiment, except for the circuit configuration shown in Fig. 5 - 1 to 1252436, as shown in Fig. 8. An adjustment circuit 102 having an illumination intensity for adjusting the light source 14 is also possible. Further, the present invention is not limited to the above-described embodiments, and various modifications and changes in design may be made without departing from the scope of the invention. In the above-described embodiments, the finger FN is read, but it is not limited to the finger FN, and the other types of the subject may be pressed and read on the contact surface 32a of the static electricity removing film 32. When the contact surface of the electrostatic removal film 3 2 is pressed against the contact surface 3 2 a, the image reading circuit 2 can read the pattern (including characters, numerals, figures, etc.) drawn on the surface of the object, or can be imaged. The reading circuit 2 reads a pattern defined by the unevenness of the surface of the subject. In the above-described embodiments, the mounting surface on which the subject is placed is the contact surface 32a of the static electricity removing film 32, but the surface of the insulating film disposed on the static electricity removing film 32 may be provided, and the surface is not provided. The static electricity removing film 32 may be used. The fingerprint reading device 1 〇1 having the structure in which the pressure sensor 50 is disposed below the image reading circuit 2 in the second embodiment is not necessarily provided with the adjustment circuit 102 as shown in FIG. It is also possible to configure the circuit shown in Fig. 5. Further, the fingerprint reading device 1 having the structure in which the pressure sensor 50 disposed so as not to overlap with the image reading circuit 2 of the first embodiment is not necessarily configured as the circuit of the fifth embodiment, and may have the The circuit configuration shown in Fig. 8 is also possible. Further, in each of the above-described embodiments, the photoelectric conversion element is described by taking the image reading circuit 2 using the sensor elements 20, 20, ... as an example, but the -32-1252436 photoelectric conversion element is applied to the present invention. The polar image reading circuit is also available. The image reading circuit using the photodiode has a CCD image sensor and a CMOS image sensor. In the C C D image sensor, a photodiode system is formed in a matrix on the substrate, and each pixel is formed, and a transfer is formed around each photodiode.
被光電二極體光電變換的電氣信號用的垂直CCD、水平CCD 〇 在CMOS影像感測器中，光電二極體係在基板上成矩 陣狀每一像素都形成，在各個光電二極體的周圍配設有放 大被光電二極體光電變換的電氣信號用的像素電路。 而且，不僅限於上述光學式感測器 '，以讀取由手指固 有的靜電電容所產生的電氣的特性的變化之非光學式感測 器讀取指紋等的影像也可以。 (五）圖式簡單說明 第1圖是顯示適用本發明的指紋讀取裝置的俯視圖。 第2A圖是以第1圖的虛線（Π )-( π )顯示未載置有手指 的狀態的剖面圖，第2B圖是以第1圖的虛線（Π )-( Π )顯示 載置有手指的狀態的剖面圖。 第3圖是以第1圖的虛線（瓜）-(瓜）顯示上述指紋讀取裝 置所具備的影像讀取電路的剖面圖。 第4 A圖是顯示上述影像讀取電路的一像素的俯視圖， 第4B圖是（IVB)-(IVB)剖面的剖面圖。 第5圖是顯示上述指紋讀取裝置的電路構成的方塊圖 -33- 1252436 第6A圖是顯示在與上述指紋讀取裝置不同的指紋讀取 未載置有手指的狀態的剖面圖，第6B圖是顯示載置有手指 的狀態的剖面圖。 第7圖是顯示第6圖所示的指紋讀取裝置的剖面圖。 第8圖是顯示第7圖所示的指紋讀取裝置的電路構成 的方塊圖。 【符號說明】 1、1 〇 1 指紋讀取裝置 2 影像讀取電路 8 影像輸入區域 10 驅動電路 11 頂閘極驅動器 12 底閘極驅動器 13 資料驅動器 14 光 源 15 擴 散 導 光 板 16 手 指 保 持 部 16a 開 □ 部 17 透 明 基 板 20 感 測 器 元 件 2 1 底 閘 電 極A vertical CCD and a horizontal CCD for electrical signals photoelectrically converted by a photodiode are used in a CMOS image sensor, and a photodiode system is formed in a matrix on the substrate, and each pixel is formed around each photodiode. A pixel circuit for amplifying an electrical signal photoelectrically converted by the photodiode is provided. Further, it is not limited to the above-described optical sensor ', and a non-optical sensor that reads a change in electrical characteristics caused by an electrostatic capacitance built by a finger may read an image of a fingerprint or the like. (5) Brief Description of Drawings Fig. 1 is a plan view showing a fingerprint reading apparatus to which the present invention is applied. 2A is a cross-sectional view showing a state in which no finger is placed on a broken line (Π)-(π) in the first drawing, and FIG. 2B is a view showing a dotted line (Π)-(Π) in the first drawing. A cross-sectional view of the state of the finger. Fig. 3 is a cross-sectional view showing the image reading circuit included in the fingerprint reading device shown by a broken line (melon) - (melon) in Fig. 1; Fig. 4A is a plan view showing one pixel of the image reading circuit, and Fig. 4B is a cross-sectional view taken along the line (IVB) - (IVB). 5 is a block diagram showing the circuit configuration of the above-described fingerprint reading device. FIG. 6A is a cross-sectional view showing a state in which a fingerprint is different from the above-described fingerprint reading device, and a finger is not placed, FIG. 6B. The figure is a cross-sectional view showing a state in which a finger is placed. Fig. 7 is a cross-sectional view showing the fingerprint reading device shown in Fig. 6. Fig. 8 is a block diagram showing the circuit configuration of the fingerprint reading device shown in Fig. 7. DESCRIPTION OF SYMBOLS 1,1 〇1 Fingerprint reading device 2 Image reading circuit 8 Image input area 10 Drive circuit 11 Top gate driver 12 Bottom gate driver 13 Data driver 14 Light source 15 Diffusion light guide plate 16 Finger holding portion 16a □ Part 17 Transparent substrate 20 Sensor element 2 1 Bottom gate electrode
22 底閘絕緣膜 23 半導體膜 24 通道保護膜 -34- 雜質半導體膜 源電極 汲電極 頂閘絕緣膜 頂閘電極 保護絕緣膜 靜電除去膜 接觸表面 底閘極線 基準電壓線 資料線 頂閘極線 壓力感測器 電極線 間隔物 密封墊 薄層材 基板 檢測電路 比較電路22 bottom gate insulating film 23 semiconductor film 24 channel protective film -34- impurity semiconductor film source electrode 汲 electrode top gate insulating film top gate electrode protective insulating film electrostatic removal film contact surface bottom gate line reference voltage line data line top gate line Pressure sensor electrode line spacer gasket thin layer substrate detection circuit comparison circuit
CPUCPU
RAMRAM
ROM 記憶部 調節電路 -35-ROM memory adjustment circuit -35-