TW200414070A - Image input apparatus - Google Patents

Image input apparatus Download PDF

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Publication number
TW200414070A
TW200414070A TW092135687A TW92135687A TW200414070A TW 200414070 A TW200414070 A TW 200414070A TW 092135687 A TW092135687 A TW 092135687A TW 92135687 A TW92135687 A TW 92135687A TW 200414070 A TW200414070 A TW 200414070A
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Taiwan
Prior art keywords
image reading
finger
subject
pressure
input device
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TW092135687A
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Chinese (zh)
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TWI252436B (en
Inventor
Tomomi Sawano
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Casio Computer Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/14—Vascular patterns
    • G06V40/145—Sensors therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14678—Contact-type imagers

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • Vascular Medicine (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Power Engineering (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Image Input (AREA)
  • Thin Film Transistor (AREA)
  • Solid State Image Pick-Up Elements (AREA)

Abstract

An image input apparatus includes an image reading assembly (2) positioned below a placement surface on which an object to be examined is placed, and a sensing circuit (61) for sensing that the object is placed on the placement surface, in accordance with a pressure applied to the placement surface.

Description

200414070 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 料進行個人認證，搭載於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。 在曰本特開2〇02-94〇4〇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- 200414070 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 極層，故指紋的紋樣無法淸楚地讀取，有無法正確地認證 的可能性。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δ買取鮮明的影像的影像輸入裝置。 一 6 - 200414070 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（threshold value)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。 200414070 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（level)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 -8- 200414070 如果是這種構造’檢測被檢體的載置的檢沏1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2B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 200414070 態的剖面圖。第3圖是以第1圖的虛線（m)-(瓜）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32a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50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 一 1 0 - 200414070 。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20、20…的影像輸入區域8的 周圍透明基板17上的頂鬧極驅動器（top gate driver)ll、底 閘極驅動器（bottom gate driver)12、資料驅動器（data drive〇13，以及被覆驅動器11、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20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23的兩端部上互相分離而形成 - 1 1 - 200414070 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 electrode)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)30 ° 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22上，半導體膜23係每一感測器元件20 都形成。半導體膜23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)或多晶砂（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（patterning)所使用的 蝕刻劑（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23入射光的話， -12- 200414070 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23的一端部上，雜質半導體膜25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2 5、2 6係每一感測器元件2 0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2 0都被形成圖案的汲電極2 8。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2 2上，排列於縱方向的同一列的各感測器元 件2 0的源電極27係與共通的基準電壓線42 一體形成，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43 —體形成。源電極27、汲電極28、基準 電壓線42以及資料線43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。 在所有的感測器元件20、20…的通道保護膜24、源電 極27以及汲電極28以及基準電壓線42、42…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2 9。頂閘絕緣膜2 9具有絕緣性以及透光性，由例 -13- 200414070 如氣化砂或氧化砂構成。 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29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20的頂閘電極3 0係與共通的頂閘極線44 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（IT 0)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3 1係接觸於頂閘電極 3 0以及頂閘極線44而形成。保護絕緣膜3 1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（ITO)、摻雜鋅的氧化銦）形成。靜電除 去膜32被接地，保持於〇(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32a係成手指FN所接觸的影像讀取電路2的面 -1 4 - 200414070 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 閘電極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、20…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。 頂閘極驅動器11爲移位暫存器（shift register)，依第 一行的頂閘極線44到第η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行）輸出重設（re set)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4 4以及連接與頂閘極線4 4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。 底閘極驅動器1 2爲移位暫存器，依第一行的底閘極線 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41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- 200414070 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（i爲1〜!1 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13在輸出重設信號到輸出read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 〇。 其次，針對驅動電路1 〇來說明。 驅動電路1 〇藉由輸出控制信號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11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（pre-charge)信號給資料驅動器13。而且，驅 動電路1 〇藉由檢測輸出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 -1 6 - 200414070 相平行，延伸於行方向的複數條電極線5 1、5 1 ...，與比配 設於複數條電極線5 1、5 1…間的電極線5 1高的間隔物 (spacer)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61輸出電壓，如第2 B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5 1以及電極線5 2的電流或電極 線51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 200414070 斷爲手指FN的尖端載置於影像讀取電路2上，光源1 4照 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 讀取電路2的狀態下，因電氣的特性變化小，故驅動電路1 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 部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- 200414070 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50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50的表面與影像讀取電路2的接觸表面32a 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32a以及壓力感測器50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51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。 -19- 200414070 檢測電路6 1驅動壓力感測器5 0，輸入輸出到壓力感測 器5 〇的電極線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62。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62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 0。 藉由賦予壓力感測器5 0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6 1與比較電路62構成。 驅動電路1 〇在由比較電路6 2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14發光。而 且，驅動電路10在光源14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- 200414070 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憶部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，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（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62輸出觸發信號給驅動電 路1 0。 另一方面如第2A圖所示，被驗者使手指FN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FN的 中節於壓力感測器5 0的表面的話，光源14發光，由擴散 -21 - 200414070 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FN反射的反射光入射到感測器元件20、20…的半 導體膜23。入射到感測器元件20、20···的半導體膜23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14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20散射。此散射光是以高強度入射到感測器元件20 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50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50的 電極線51、51 ...與電極線52、52…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輸出觸發丨g號給驅動 電路1 0。 由比較電路6 2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。 接著，驅動電路1 〇輸出控制信號Tent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- 200414070 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2 0、2 0 ... 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23 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成爲〇(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32a，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20的半導體膜23 ，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24，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2 0的半導體膜2 3 ’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1 3對所有的資料線4 3、4 3…輸出高 位準的預充電（pre-charge)信號’保持資料線43、43…於預 定的電壓。 底閘極驅動器12在施加_20(V)給頂閘電極30經過預定 時間後，施加+ 1 〇 (V)的電壓給底閘電極2 1。此時，在位於 手指FN的凹部的下方的感測器元件20以及未載置有手指 FN的部分的下方的感測器元件20中’因充分的光未被入 - 23 - 200414070 射，在半導體膜23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+10(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 0的 -20(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 43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20 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 0 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+10(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43、43…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’ C P U 6 3判定是否視由感測器元件2 0、2 0…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，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CPU63可在記憶部66 -24 - 200414070 的特定區域以及通常區域存取或門鎖定（door lock)等被解 除的模式。另一方面，c p u 6 3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FN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3 2 a，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50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F N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- 200414070 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 2a，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62輸出到驅動電路1 0，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50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50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- 200414070 反而手指FN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32a的壓力也賦予壓力感測器50，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 - 200414070 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 i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的交叉部中的電 阻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 所示的電路構成外，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6 1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。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14 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 光色調信號的亮度使光源1 4發光。即調節電路1 02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Dent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 - 28- 200414070 資訊信號的壓力水平在容許範圍內且低（按壓力小）的話， 輸出光源1 4的發光亮度低的發光色調信號給調節電路} 〇2 ’若是來自比較電路62的壓力資訊信號的壓力水平在容許 範圍內且高（按壓力大）的話，輸出光源14的發光亮度高的 發光色調信號給調節電路102。 指紋讀取裝置1 0 1的構成要素除了如以上所說明的外 與指紋讀取裝置1的構成要素一樣，省略針對影像讀取電 路 2、壓力感測J 器 5 0、檢 ilj 電路 6 1、C P U 6 3、R A Μ 6 4、R Ο Μ 6 5 以及記憶部66的詳細的說明。 其次，針對指紋讀取裝置1 0 1的動作以及使用方法來 說明。 如第6Α圖所示，在影像讀取電路2的接觸表面32a未 接觸任何東西時，因由檢測電路6 1輸出到比較電路62的 檢測信號的壓力水平低，未由比較電路62輸出壓力資訊信 號給驅動電路1 0，故驅動電路1 0經由調節電路1 0 2使光源 14發光。 另一方面如第6B圖以及第7圖所示，若被驗者載置於 手指FN的末節於靜電除去膜32的接觸表面32a，則由手 指FN經由影像讀取電路2賦予壓力給壓力感測器5 0。因 由檢測電路6 1輸出給比較電路62的檢測信號的壓力水平 高，故比較電路6 2根據檢測信號的壓力水平.，輸出手指被 載置的識別資訊以及包含哪種程度的按壓力的資訊的壓力 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輸 出發光色調信號給調節電路1 02。調節電路1 02根據此發光 -29 - 200414070 色調信號以預定的亮度使光源1 4發光。其中，調節電路丨〇2 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3 2 a的按壓力低或高進行調節以提高光源1 4的發 光強度。此外’若由檢測電路6 1輸出給調節電路1 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20，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20，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CPU63。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CPU63起動通常模式。 針對本實施形態的功效來說明。 -30- 200414070 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32a，有凸部的反射光爲低強度而入射到半 導體膜23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32a，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23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FN所產生的壓力變高，因光源14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 -31- 200414070 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102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 32a，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1〇2也可以’爲第5圖所不的電路構成也可 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- 200414070 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 CD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 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2 B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。 弟3 Η是以弟1圖的虛線（瓜）-(皿）顯不上述指紋讀取裝 置所具備的影像讀取電路的剖面圖。 弟4Α圖是顯不上述影像讀取電路的一像素的俯視圖， 第4Β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- 200414070 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、101 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 開口部 17 透明基板 20 感測器元件 2 1 底閘電極 22 底閘絕緣膜 23 半導體膜 24 通道保護膜200414070 (1) Description of the invention: (1) Technical field to which the invention belongs The present invention relates to an image reading circuit provided under a mounting surface on which a subject is placed, and the aforementioned subject is read by an image reading device An image input device for inputting an image of the subject. (II) Prior art Fingerprints are very useful for personal authentication because they present their own unique appearance. In recent years, a fingerprint authentication device suitable for fingerprints for personal authentication has been developed. Specifically, the fingerprint authentication device performs personal authentication by checking the fingerprint image read by the image reading device and the fingerprint image data of the registrant registered in advance, and it is mounted on a PC (Persona 1 C 〇mputer: personal computer), Information devices such as PDA (Personal Digital Assistants) and mobile phones have been reviewed. Japanese Patent Application Laid-Open No. 2002-94040 discloses a two-dimensional image reading device used for a fingerprint authentication device. This two-dimensional image reading device includes a photosensor array in which a plurality of light sensors are arranged on a transparent substrate, and the photosensor array is arranged on the light sensor array facing the back of the light sensor array. A back light, a transparent electrode layer covering the surface of the light sensor array, and a detection unit that detects a change in voltage of the electrode layer. If the operation and use method of the conventional two-dimensional reading device is explained, since the subject has a unique resistance and capacitance, if the subject places his or her finger on the electrode layer, it will contact the The unique voltage change caused by the electrode layer is detected by the detection unit, the backlight is illuminated by finger detection by the detection unit, and light is irradiated on the finger, and the light detection is performed by the detection unit by 5-200414070 finger detection. The scanner array performs an image reading operation to read an image of a finger. The image of the finger read by the light sensor 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. (3) Summary of the Invention However, the sweating state of a finger varies from person to person, and the force with which a finger presses the electrode layer when placing a finger on the electrode layer also varies from person to person. If the sweating state of the finger is different, the unique voltage change caused by the finger touching the electrode layer is also different. If the force of pressing the electrode layer is different, the contact area between the finger and the electrode layer is also different, and the voltage change of the electrode layer is also different. . Therefore, in the conventional two-dimensional image reading device, if the tolerance caused by the personal difference in sweating state or the deviation of the force of pressing with a finger is too narrow, someone places a finger on the electrode layer. Even if a person's finger can read the fingerprint image by the detection unit, there are other people who cannot place the other person's finger through the detection unit even if the finger is placed on the electrode layer. Fingerprint images of others. Even the same person may have different finger sweating or pressing pressure depending on the situation, and may not be able to read the fingerprint image of the finger. In addition, if the allowable amount is widened, there is a possibility that a person who touches the electrode layer other than a finger may malfunction, and if the allowable amount is widened until the force pressing the electrode layer is weak, the convex part of the finger is not in close contact with the electrode Layer, so the fingerprint pattern cannot be read clearly, and there is a possibility that it cannot be authenticated correctly. Furthermore, such a weak voltage change makes it difficult to perform high-precision detection due to noise from surrounding electromagnetic waves. Therefore, an object of the present invention is to provide an image input device which can easily and reliably read an image and can purchase a sharp image at δ. 6-200414070 In order to solve the above problems, the image input device in the present invention includes: an image reading circuit disposed under a mounting surface on which a subject is placed; and detecting the aforementioned pressure by applying a pressure to the mounting surface. The test object is placed on the mounting surface. In the present invention, if a subject is placed on the mounting surface, the pressure is applied to the mounting surface by the subject, and the detection means detects the placement of the subject by the pressure applied to the mounting surface. The reading operation of the image reading circuit can be stopped when the object is not placed on the mounting surface, and the reading operation of the image reading circuit can be stopped immediately when the subject is placed on the mounting surface, so that the failure to prevent For the power consumption when the specimen is placed on the mounting surface, no special action is required except for placing a finger in order to perform a reading operation. Therefore, it is possible to reliably read the image of the subject only by placing the subject on the mounting surface. In addition, in the case where a finger is applied to the subject, it is known that the placement of the finger cannot be detected due to the sweating state of the finger, etc. However, in the present invention, if a finger is placed on the mounting surface, the finger is given pressure. The mounting surface can reliably detect the placement of the finger by the detection means, and can reliably read the image of the finger. In the present invention, the detection means includes: a pressure sensor that detects a pressure applied to the mounting surface; and a threshold value that separates a pressure level detected by the pressure sensor from a mounted state and an unmounted state ( (threshold value) comparison, when a threshold value is reached, a triggering signal for performing an image reading operation is output to the comparison means of the image reading circuit. 200414070 If the subject is placed on the mounting surface, 'the pressure is applied to the mounting surface by the subject, but if the pressure imposed by the subject is small,' the contact area between the subject and the mounting surface is small It is assumed that a sharp image cannot be read even when the image is read by the image reading circuit. However, if such a configuration is adopted, if the level of the detection signal indicating the pressure applied to the mounting surface by the subject is not critical or higher, the trigger signal will not be output due to comparison means, and the image reading circuit will not The image reading operation is performed, so no such unclear image is read. In addition, if the level of the detection signal indicating the pressure exerted by the subject on the mounting surface exceeds a critical threshold, a trigger signal is output by a comparison means, and the image reading circuit performs an image reading operation on the subject and the mounting surface. In the case where the contact area is very large, the image is read by the image reading circuit, so the sharp image can be read reliably. In addition, if the present invention includes an adjusting means for adjusting the brightness of a light source that irradiates the subject with light according to the pressure given to the mounting surface by the subject, the pressure on the mounting surface generated by the subject is based on the pressure on the mounting surface. Since the light irradiation intensity of the light source is adjusted, light having an intensity suitable for 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 clear, the image of the subject can be read clearly. The image input device according to the present invention includes: an image reading circuit arranged below a mounting surface on which a subject is placed; and an image reading circuit arranged below the image reading circuit to apply pressure to the mounting surface. Detection means for detecting that the subject is placed on the mounting surface-8-200414070 If this structure is used, the inspection means for detecting the placement of the subject is 1 when the subject is not placed on the mounting surface The reading operation of the image reading circuit can be stopped 'and the reading operation of the image reading circuit can be stopped immediately when the subject is placed on the mounting surface, and the detection means is arranged below the image reading circuit' An image input device that can be miniaturized in the opposite direction is particularly effective for an authentication device that is excellent in portability. Furthermore, the image input device of the present invention includes: a detection means for outputting a detection signal by the pressure on which a finger is placed; when the finger is placed on the detection means, it is arranged below a part having a fingerprint of the finger, and the reading is in accordance with A plurality of sensor elements of a concave-convex image of a finger; and a driving circuit for starting an image reading operation of the plurality of sensor elements by the detection signal. In this way, since a plurality of sensor elements are arranged so as to be located under a portion having a fingerprint of the finger when the finger is placed on the detection means, the image reading operation can be performed easily and the finger is not placed on the detection means. The sensor element does not perform an image reading operation when it is up, so power consumption can be suppressed. (4) Embodiments The following describes specific aspects of the present invention using 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 the image input device of the present invention is applied, and Figs. 2A and 2B are broken lines (Π)-(Π) of the first figure, respectively. A cross-sectional view showing a state where a finger is not placed and a state where a finger is placed is 200414070. Fig. 3 is a cross-sectional view shown by dashed lines (m)-(melons) in Fig. 1. The fingerprint reading device 1 is provided with an electric signal for converting the light reflected from the first joint placed on the contact surface 32a to the tip finger FN or the amount or intensity of light transmitted through the finger FN to read the fingerprint image of the finger FN. In addition, the solid-state imaging device of the optical sensor and its driver are integrated with an image reading circuit 2 and a driving circuit 10 for detecting fingerprint image data of a finger FN by detecting an electrical signal from the image reading circuit 2 and A light-irradiating means for irradiating light on the finger FN placed on the contact surface 32a of the image reading circuit 2 and a film-type pressure feeling that detects the pressure generated by the contact between the finger FN from the second joint to the first joint The sensor 50 and the finger holding portion 16 for holding the finger FN at a predetermined position in the image reading circuit 2 and the pressure sensor 50. First, the light irradiation means will be described. The light irradiation means includes a light source 14 such as an LED that emits light, a cold cathode fluorescent tube, and guides the light emitted from the light source 14 to the image reading circuit 2. The image reading circuit 2 irradiates the finger FN of the subject with light 15 with a diffused light guide plate. The diffused light guide plate 15 is substantially 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 15 and the light emitted from the surface of the diffusion light guide plate 15 is evenly irradiated on the back surface of the image reading circuit 2. Alternatively, instead of the diffused light guide plate 15 and the light source 14, a surface light-emitting element such as an organic EL element may be disposed so as to face the back surface of the image reading circuit 2. Next, the image reading circuit 2 will be described with reference to Figs. 1 to 4-10-200414070. FIG. 4A is a plan view showing one pixel of the image reading circuit 2, and FIG. 4B is a cross-sectional view shown by dashed lines (IV B)-(IV B) in FIG. 4A. The image reading circuit 2 includes a substantially flat transparent substrate 17 and a plurality of N in a matrix shape arranged in a matrix of η rows and m columns (η and m are integers) arranged on one side of the transparent substrate 17. Optical sensor element (hereinafter referred to as sensor) composed of a channel-type double-gate type transistor 20, 20. . . And a top gate driver 11, a bottom gate driver 12, and a data driver formed on a transparent substrate 17 around the image input area 8 in which the sensor elements 20, 20... Are arranged. (Data drive 〇13, and the protective insulating film 31 covering the drivers 11, 12, 13, and the sensor elements 20, 20 ..., the static electricity removing film 3 2 formed on the protective insulating film 31. The transparent substrate 17 pairs Of the light emitted from the light source 14, light in a wavelength range detectable by the sensor element 20 is transmissive (hereinafter referred to simply as light transmissive) and has insulation properties, and is a glass substrate such as quartz glass or polycarbonate. Polycarbonate and other plastic substrates. This transparent substrate 17 constitutes the back surface of the image reading circuit 2 and the diffuse light guide plate 15 and the transparent surface 17 ° to this transparent substrate. Each sensor element 20 is a photoelectric conversion element for the pixel. It 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 and a bottom gate insulating film 22 sandwiched therebetween. And face The semiconductor film 23 of the gate electrode 21 and the channel protection film 24 made of silicon nitride formed on the central portion of the semiconductor film 23 are formed separately from both ends of the semiconductor film 23-1 1-200414070 The impurity semiconductor films 25 and 26, the source electrode 27 formed on the impurity semiconductor film 25, the drain electrode 28 formed on the impurity semiconductor film 26, and the source electrode 27 and the drain The top gate insulating film 29 on the electrode 28 is interposed between the semiconductor film 23 and the top gate insulating film 29 and the channel protection film 24 and faces the top gate electrode 30 of the semiconductor film 23 on a transparent substrate 1 7 In the above, the bottom gate electrode 21 is formed in a matrix shape for each sensor element 20. Further, η bottom gate lines 4 1, 4, 1, ... extending in a horizontal direction are formed on the transparent substrate 17 and arranged. The bottom gate electrode 21 of each sensor element 20 in the same row in the horizontal direction is formed integrally with the common bottom gate line 4 1. The bottom gate electrode 21 and the bottom gate line 41 are conductive and shielded from light. Properties, such as chromium, chromium alloys, aluminum or aluminum alloys, or These elements are made of an alloy. The bottom gate electrode 21 and the bottom gate line 41 are formed with all the sensor elements 20, 20. . . 的 底 Bruk insulation film 22. The bottom gate insulating film 22 has insulation and light transmission properties, and is made of, for example, silicon nitride or silicon oxide. On the bottom gate insulating film 22, a semiconductor film 23 is formed for each sensor element 20. The semiconductor film 23 has a substantially rectangular shape in plan view, and is a layer formed of amorphous silicon or polysilicon having an electron-hole pair when light of a predetermined wavelength range is incident. A channel protection film 24 is formed on the semiconductor film 23. The channel protection film 24 has a function of protecting an interface of the semiconductor film 23 from an etchant used for patterning, has an insulating property and a light transmitting property, and is made of, for example, silicon nitride or silicon oxide. When light is incident on the semiconductor film 23, an electron-hole pair according to the amount of incident light is generated at the center near 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 protection film 24 in accordance with the electric fields of the bottom gate electrode 21 and the top gate electrode 30. On one end portion of the semiconductor film 23, the impurity semiconductor film 25 is formed by partially overlapping the channel protective film 24, and on the other end portion of the semiconductor film 23, the impurity semiconductor film 26 is partially formed by overlapping the channel protective film 24. The impurity semiconductor films 25 and 26 are each patterned with each of the sensor elements 20. The impurity semiconductor films 25 and 26 are made of amorphous silicon (η + silicon) containing n-type impurity ions. On the impurity semiconductor film 25, a source electrode 27 is formed in which each sensor element 20 is patterned. On the impurity semiconductor film 26, a drain electrode 28 is formed in which each sensor element 20 is patterned. Moreover, m reference voltage lines 42, 42 ... and data lines 43, 43 ... extending in the vertical direction are provided. The source electrode 27 of each sensor element 20 arranged on the same row in the vertical direction on the bottom gate insulating film 22 is formed integrally with the common reference voltage line 42 and arranged in the same row in the vertical direction. The drain electrode 28 of each sensor element 20 is integrally formed with a common data line 43. The source electrode 27, the drain electrode 28, the reference voltage line 42, and the data line 43 have conductivity and light-shielding properties, and are made of, for example, chromium, a chromium alloy, aluminum, an aluminum alloy, or an alloy of these elements. All the sensor elements 20, 20 ... are formed on the channel protection film 24, the source electrode 27 and the drain electrode 28, and the reference voltage lines 42, 42 ... and the data lines 4 3, 4 3 ... which are common to all the senses. The top gate insulating film 29 of the device elements 2 0, 2 0 ·····. The top gate insulating film 29 has insulation and light transmission properties, and is composed of Example -13-200414070 such as gasified sand or oxidized sand. On the top-gate insulating film 29, a top-gate electrode 30 in which each sensor element 20 is patterned is formed. In addition, n top gate lines 44 extending in the horizontal direction are formed on the top gate insulating film 29, and the top gate electrodes 30 of the sensor elements 20 arranged in the same row in the horizontal direction are common top gates. The polar wires 44 are integrally formed. The top gate electrode 30 and the top gate line 44 are conductive and light transmissive, for example, made of 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) or zinc-doped indium oxide). The sensor element 20 configured as described above is a photoelectric conversion element having the semiconductor film 23 as a light receiving section. The common protective insulating film 3 1 is in contact with the top gate electrode 30 and the top gate line 44 on the top gate electrode 30 and the top gate lines 44, 44... Of all the sensor elements 20, 20... And formed. The protective insulating film 31 has an insulating property and a light transmitting property, and is made of silicon nitride or silicon oxide. A static elimination film 3 2 is formed on one surface of the protective insulating film 31. The static elimination film 32 is electrically conductive and light transmissive, for example, made of indium oxide, zinc oxide, or tin oxide, or a mixture containing at least one of these compounds (for example, tin-doped indium oxide (ITO), zinc-doped Indium oxide). The static elimination film 32 is grounded and maintained at 0 (V), and the static electricity carried by the finger FN is removed to prevent the sensor element 20, 20 ... or the top gate driver 1 1, the bottom gate driver 1 2, and the data. The drive 1 3 is damaged by static electricity. The contact surface 32a of the static elimination film 3 2 is the surface-1 of the image reading circuit 2 which is touched by the finger FN. 4-200414070 In the above image reading circuit 2, the diffused light guide plate 15 is incident on the transparent substrate 1 7 The light is shielded by the bottom gate electrode 21 and does not directly enter the semiconductor film 23. Moreover, since the bottom gate electrode 21 is not formed between the sensor elements 20, 20, ..., the light incident on the transparent substrate 17 from the diffused light guide plate 15 passes through the sensor elements 20, 20, ... At the same time, 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 held at a constant voltage, for example, they are held at 0 (V) by ground. The bottom gate lines 41, 41 ... are connected to the outputs of the bottom gate driver 12. The top gate lines 44 and 44 are connected to the outputs of the top gate driver 11. The top gate driver 11 is a shift register, in the order of the top gate line 44 in the first row to the top gate line 44 in the η row (when reaching the η row, return to the first as needed) Line) output a 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 reset potential at a high level except for the holes stored in the semiconductor film 23 and the channel protection film 24. When the reset signal is not When outputted to the top gate line 44 of a certain row, the top gate line 44 and the top gate electrode 3 0 connected to the top gate line 44 are to hold electrons generated by light incident on the semiconductor film 23- The low-level carriers of the hole pair store the potential. The bottom gate driver 12 is a shift register, in the order of the bottom gate line 41 from the first row to the bottom gate line 41 from the η row (if it reaches the η row, it returns to the first row as needed) ) Output the high level read signal. When the read signal is output to the bottom gate line 41 of a certain row, the bottom gate line 41 and the bottom gate electrode 2 1 connected to the bottom gate line 41 become a channel formed in the semiconductor film 23 3-200414070 The read potential and the size of the channel area depend on the amount of light incident on the semiconductor film 2 3. After the top gate driver 11 outputs a reset signal to the top gate line 44 of the i-th row (i is any integer from 1 to! 1), the bottom gate driver 12 outputs a read signal to the bottom gate of the i-th row. The pole line 41, the top gate driver 11 and the bottom gate driver 12 offset the output signals. The data driver 13 supplies all data lines 43 and 43 between the output of the reset signal and the output of the read signal. . . Outputs a pre-charge signal at a predetermined level (high level). Furthermore, the data driver 13 amplifies the data lines 43 and 43 after the output of a pre-charge (pre-charge) signal. . . The voltage is output to the drive circuit 1 〇. Next, the driving circuit 10 will be described. The driving circuit 1 〇 outputs the control signal Bent to the bottom gate driver 12 to output a read signal to the bottom gate driver 12 and outputs the control signal Tent to the top gate driver 11 to output a reset signal to the top. The gate driver 11 outputs a control signal Dent to the data driver 13 to appropriately output a pre-charge signal to the data driver 13. Furthermore, the drive circuit 10 uses the data lines 43 and 43 after a predetermined time has passed after the output read voltage is detected. . . Voltage, or by detecting the output voltage after reading the data line 43, 43. . . The time until the voltage reaches a predetermined threshold voltage to obtain a fingerprint image of the finger FN. Next, the pressure sensor 50 will be described. As shown in FIG. 2A, the pressure sensor 50 includes a transparent substrate 17 arranged adjacent to the image reading circuit 2, and mutually formed on the transparent substrate 17 are parallel to each other and extend in the row direction. A plurality of electrode wires 5 1, 5 1. . . The spacers 53 and 53 which are higher than the electrode lines 51 arranged between the plurality of electrode lines 5 1, 5, 1 ..., and the plurality of electrode lines 52, 52, which extend parallel to each other in the column direction. A flexible sheet material 55 formed on the back surface covers the periphery of the sheet material 5 5 and joins the seal 54 of the transparent substrate 17 and the sheet material 5 5 to form a plurality of electrode wires 52. , 52. . . The spacer 53 is separated from the plurality of electrode wires 5 1, 5 1... And the electrode wires 5 2 are orthogonal to the electrode wires 5 1 in a plan view, and the electrode wires 5 1 and the electrode wires 5 2 face each other to adhere a thin layer. The structure of the material 5 5 and the transparent substrate 17. Spacer 5 3, 5 3. . . A plurality of electrode wires 5 2 and 5 2 are arranged on the back surface of the thin layer material 5 5. . . Sometimes configuration is also possible. In addition, after repeatedly pressing the pressure sensor 50 repeatedly with a finger, if there are a plurality of electrode wires 5 1 and 5 1 in a state that they are not pressed. . . The spacer 53 is not necessarily required for a sufficient restoring force to the extent that it can be separated from the plurality of electrode wires 5 2 and 52. A voltage is output from at least one of the electrode line 51 and the electrode line 52 of the pressure sensor 50 by a detection circuit 61 described later. As shown in FIG. 2B, if the finger FN is placed on the image reading circuit 2 And on the pressure sensor 50, the thin layer material 5 5 is bent by the pressing force of the finger FN, and with this, the electrode wire 52 is bent to contact the electrode wire 51. At this time, since the electrode wire 51 and the electrode wire 52 are turned on, an electric current such as a current flowing through the electrode wire 51 and the electrode wire 5 2 or at least one of the electrode wire 51 and the electrode wire 5 2 or an electrical characteristic such as resistance 値Variety. This change in electrical characteristics is designed so that the finger FN is proportional to the force pressing the pressure sensor 50. Therefore, if the detection circuit 61 reads the change in electrical characteristics to the extent that the finger FN fully presses the pressure sensor 50, it is judged that 200414070 The tip of the finger FN was placed on the image reading circuit 2, and the light source 14 irradiated the light to start the reading operation of the image reading circuit 2. In order to prevent the finger FN from pressing the pressure sensor 50 sufficiently, the driving circuit 1 does not perform an image reading circuit because the electrical characteristics change little in a state where the finger FN is not sufficiently attached to the image reading circuit 2. 2 reading operation. Therefore, due to insufficient attachment, not only the image reading circuit 2 does not read the shadow of the fingerprint of the finger FN as an indistinct image, but because the light source 14 does not emit light, it is perceptible to the subject not to be rejected by authentication To insufficiently press the finger FN. Therefore, the subject fully presses his finger FN on 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. Therefore, 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 wire 51 and the electrode wire 52. In this case, the pressure-sensitive ink layer on the electrode wire 51 is arranged to overlap with the electrode wire 52. The resistance between the electrode line 51 and the electrode line 52 is a characteristic that depends on the pressure applied to the pressure-sensitive ink layer, and if the magnitude of the pressure changes, the resistance and the like also change. In this pressure sensor 50, the pressure at the crossing portion can be detected by the resistance or the like at the crossing portion of the electrode wire 51 and the electrode wire 52. Furthermore, since the pressure sensors 50 are arranged in a matrix form when viewed in a plan view, the change in electrical characteristics of the electrode wires 51 or electrode wires 52 of each of the intersections is measured by the detection circuit 61, It can detect the pressure distribution in the surface, and can detect the pressure in the entire surface. Among them, when the pressure distribution in the detection surface of the detection circuit 61 is approximately equal, the pressure sensor 50 determines that the portion of the fingerprint having the tip of the finger FN is placed on the image reading circuit 2 without unevenness, and the light source 1 4 irradiation-18- 200414070 The light starts the reading operation of the image reading circuit 2. On the other hand, in the case where the uneven pressure distribution is significantly biased toward one side, the light source 14 does not have the possibility that the part of the fingerprint having the tip of the finger FN does not unevenly contact the image reading circuit 2. The irradiation light does not start the reading operation of the image reading circuit 2. As shown in Fig. 1, the pressure sensor 50 and the image reading circuit 2 are arranged at mutually different positions in a plan view (looking at the contact surface 3 2a of the image reading circuit 2). In detail, the pressure sensor 50 is arranged adjacent to the image reading circuit 2. The surface of the pressure sensor 50 and the contact surface 32a of the image reading circuit 2 are in the same plane, and the surface of the pressure sensor 50 is also a load. Placement surface with finger FN. Next, the finger holding unit 16 will be described. The finger holding portion 16 is formed with an opening 16 a which is opened in the shape of a finger from the tip of the finger FN to the second joint. The finger holding portion 16 is attached to the contact surface 32 a of the image reading circuit 2 and the pressure sensor. On the surface of 50, the image input region 8 in which the sensor elements 20, 20, ... are arranged, and the pressure detection region in which the intersection of the electrode wire 51 and the electrode wire 52 are arranged are exposed to the opening. An opening portion of the finger holding portion 16 corresponding to the last segment of the finger is provided in the image input area 8. Next, the circuit configuration of the fingerprint reader 1 will be described with reference to Fig. 5. As shown in FIG. 5, the fingerprint reading device 1 includes a detection circuit 6 in addition to the image reading circuit 2, the driving circuit 10, and the pressure sensor 50 1, a comparison circuit 62, a CPU 63, a RAM 64, a ROM 65, and a voice忆 部 66。 Memory 66. -19- 200414070 The detection circuit 6 1 drives the pressure sensor 50, and inputs and outputs to at least one of the electrode line 51 and the electrode line 52 of the pressure sensor 50, and the electrical characteristics of the signal change. The detection signal of the overall pressure level in the plane detected by the pressure sensor 50 is given to the comparison circuit 62. The detection circuit 61 outputs the pressure distribution data indicating the pressure distribution detected by the pressure sensor 50 to the CP U 63. The comparison circuit 62 receives a detection signal from the detection circuit 61, and compares the level of the detection signal with the threshold between the finger mounting state and the finger unmounted state, and outputs a trigger signal to the driver when the detection signal level exceeds the threshold. Circuit 1 0. The detection means for detecting the finger FN placed on the contact surface 32a of the image reading circuit 2 by applying pressure to the surface of the pressure sensor 50 is composed of the pressure sensor 50, the detection circuit 61, and the comparison circuit 62 described above. . When the drive circuit 10 receives a trigger signal from the comparison circuit 62, it first outputs a signal that causes the light source 14 to emit light, so that the light source 14 emits light. Furthermore, after the light source 14 emits light, the driving circuit 10 outputs a control signal Bent to the bottom gate driver 12, a control signal Tent to the top gate driver 11, and further outputs a control signal group Dent to the data driver 13. As a result, 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 obtained by the driving circuit 10, and the data of the fingerprint image is output to the CPU 63. Each registered person in the memory unit 66 stores registered fingerprint image data of the last segment of the finger. In addition, the memory unit 66 has a data storage area for storing various kinds of data outside the area where the registered fingerprint image data is stored. The data storage area -20-200414070 is composed of a specific area and a normal area. The registered image data may be data indicating the relative positions of a plurality of feature points extracted from the fingerprint, or may be an image. A program executable by the CPU 63 is stored in the ROM 65. CPU63 uses RAM64 as the working area, and according to the program stored in ROM65, fingerprint image data is input by drive circuit 10, pressure distribution data is input by detection circuit 61, or whether the load is placed under pressure is determined based on the input pressure distribution data. The sensor 50 surface is the middle section of the finger, or when it is determined that the visual load placed on the pressure sensor 50 surface is the middle section of the finger, by comparing the fingerprint image data input by the drive circuit 10 with the The registered fingerprint image data stored in the memory section 66 is used to determine whether the fingerprint image data is consistent with the registered fingerprint image data. Furthermore, the CPU 63 activates the secret mode when the visual fingerprint image data is consistent with the registered fingerprint image data, and starts the normal mode when the visual fingerprint image data is not consistent with the registered fingerprint image data. The operation and method of use of the fingerprint reader 1 according to this 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 overall pressure in the plane detected by the pressure sensor 50 is not full. Therefore, it is not output by the comparison circuit 62. Trigger signal to drive circuit 10. On the other hand, as shown in FIG. 2A, the subject placed the last section of the finger FN on the contact surface 3 2 a of the static elimination film 32 and simultaneously placed the middle section of the finger FN on the surface of the pressure sensor 50. Then, the light source 14 emits light, and the light emitted by the diffuser 21-200414070 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 semiconductor film of the sensor elements 20, 20 ... twenty three. The in-plane intensity distribution of the reflected light incident on the semiconductor film 23 of the sensor elements 20, 20 ... is based on the unevenness along the finger FN. The light from the light source 14 incident on the convex portion of the finger FN attached to the contact surface 32a propagates into 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 with a high intensity to generate an electron-hole pair. In contrast, in the recessed portion of the finger FN separated by the contact surface 32a, after taking in the space between the recessed portion and the contact surface 32a, the diffuse reflection is repeated between the recessed portion and the space to attenuate, so the sensor below the recessed portion In the semiconductor film 23 of the element 20, light is not sufficiently reflected, and electron-hole pairs are not sufficiently generated. However, since the middle section of the finger FN is not placed on the pressure sensor 50, pressure is applied to the pressure sensor 50 by the finger FN. If the pressure pair is sufficiently pressed with the finger FN at this time, the electrode wires 51 and 51 located in the pressure sensor 50 are located. . . Several of the plurality of pressure detection points that are connected to the respective intersections of the electrode wires 52, 52, ... are turned on, and a potential change occurs. Further, if the number of conductive positions among the plurality of pressure detection points reaches a predetermined number, the pressure level of the detection signal reaches a threshold 値 ', and the comparison circuit 62 outputs a trigger number g to the drive circuit 10. The drive circuit 10, which receives a trigger signal from the comparison circuit 62, first outputs a signal that causes the light source 14 to emit light, and the light source 14 irradiates light toward the contact surface 32a. Next, the driving circuit 10 outputs a control signal Tent to the top gate driver 11 and a control signal Bent to the bottom gate driver 12 and further outputs a control signal-22- 200414070 to the data driver 13. The sensor elements 20, 20 of a predetermined row in the image reading circuit 2. . .  In the above, a reset signal composed of a relatively positive ground voltage from the top gate driver 11 is applied to the top gate electrode 30, and the holes stored in the semiconductor film 23 and the channel protective film 24 have been released until then. Next, the top gate electrode 30 is applied to -20 (V), the bottom gate electrode 21 becomes 0 (V), and reading of the reflected light caused 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 effectively incident on the semiconductor film 23 of the sensor element 20 located below, and a large number of electron-hole pairs are generated. At this time, with the negative electric field applied to the top gate electrode 3 0, only the positively-charged holes are trapped in the semiconductor layer 23 and the channel protection film 24, and the electrons are repelled by the negative electric field and are discharged to the sensor element 20 Outside. 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 2 3 ′ holes incident on the sensor element 20 located below are not sufficiently stored in the semiconductor film 23 and the channel protection film 24. Furthermore, the data driver 13 outputs high-level pre-charge signals to all the data lines 4 3, 4 3 ... to hold the data lines 43, 43 ... at a predetermined voltage. The bottom gate driver 12 applies a voltage of +10 (V) to the bottom gate electrode 21 after a predetermined time has passed from applying -20 (V) to the top gate electrode 30. At this time, the sensor element 20 located below the recessed portion of the finger FN and the sensor element 20 below the portion where the finger FN is not placed are not irradiated due to sufficient light-23-200414070 No holes are stored in the semiconductor film 23 and the channel protection film 24. Therefore, an electric field generated by a voltage of +10 (V) from the bottom gate electrode 21 that wants to form a channel in the semiconductor film 23 is generated by the top gate that wants to make the channel disappear. The electric field generated by the voltage of -20 (V) of the electrode 3 is canceled. Since the empty layer expands in the semiconductor film 23, the current does not flow between the source / drain, and the pre-charge voltage of the data line 43 is intact. Immobility is maintained. In contrast, since the sensor element 20 located below the convex portion of the finger FN does not sufficiently enter the reflected light from the light source 14, holes are stored in the semiconductor film 23 and the channel protection film 24. This hole has the effect of being attracted by the electric field of -20 (V) at the top gate electrode 30 and offsetting the negative electric field of the top gate electrode 30 according to the amount of charge. Therefore, the channel is not formed when the bottom gate electrode 21 is 0 (V), but if the bottom gate electrode 21 turns to +10 (V), the ratio of the positive electric field generated by the electric field of the bottom gate electrode 21 and the stored holes The negative electric field of the top gate electrode 30 is also large, and a channel is formed in the semiconductor layer 23. Therefore, the current does not flow from the drain electrode 28 which becomes 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 1 3 can detect the convex or concave part of the finger by reading the potential of the data lines 43, 43... Thus, the above-mentioned series of operations of taking in the output of the reset signal to the potential of the data lines 43, 43 ... is performed for each row in sequence. Furthermore, 'C P U 6 3 determines whether or not the fingerprint image data inputted by the sensor elements 20, 20, ... is consistent with the registered fingerprint image data of the memory unit 66. Moreover, the CPU 63 activates the security mode when the fingerprint image data is consistent with the registered fingerprint image data. The security mode refers to a mode in which the CPU 63 can be released in a specific area of the memory section 66 -24-200414070 and in normal area access or door lock. On the other hand, c p u 6 3 activates the normal mode when the fingerprint image data and the registered fingerprint image data are not observed. The normal mode refers to a mode in which the CPU 63 can be accessed in a normal area of the memory section 66 and cannot be accessed in a specific area or a door lock has not been released. The effect of this embodiment will be described. The finger FN is placed on the contact surface 3 2 a of the image reading circuit 2 from the first joint to the tip, and from the second joint to the first joint only on the surface of the pressure sensor 50. Check the placement of your finger and start reading the fingerprint image. In this way, after placing a finger at a predetermined position, pressing a button for starting fingerprint authentication with a different finger makes it unnecessary for the subject to perform two steps, and the reading can be easily started. In addition, if the finger FN is not placed, power consumption can be suppressed because the image reading circuit 2 does not operate. Further, as shown in FIG. 2B, a middle section of the finger FN is also placed on the surface of the pressure sensor 50 on the surface of the image reading circuit 2 at substantially the same time as the finger FN is placed on the surface of the pressure sensor 50. Sensor 5 0. At this time, when the fingertip with the fingerprint of the finger FN is not placed on the contact surface 32a of the image reading circuit 2 in a wide range, even if sufficient pressure is not applied to the pressure detection points at several positions, the contact becomes contact. The pressure distribution in the surface of the surface 3 2 a does not undergo a biased voltage change. Since the pressure level of the detection signal does not reach a critical threshold, the image reading by the image reading circuit 2 is not performed, even if an unclear image is not read. Yes. At this time, since the light source 14 does not emit light, the subject may notice that the light of the light source 14 cannot be visually confirmed, and the image reading circuit 2 does not perform a reading operation. -25- 200414070 According to this, because the finger FN is not pressed on the image reading circuit 2 ′ with sufficient force or the fingertip with a fingerprint is not widely contacted to the contact surface 3 2 a of the image reading circuit 2, The inspector notices that the image reading circuit 2 does not perform fingerprint reading, and can urge the finger FN to strongly and widely press the fingertip with the fingerprint on the image reading circuit 2 and the pressure sensor 50. Moreover, if the subject presses the finger FN on the pressure sensor 50 in a wide range with sufficient pressure, and the conduction position among the plurality of pressure detection points reaches a predetermined number, the pressure level of the detection signal reaches a critical level, triggering The signal is output from the comparison circuit 62 to the driving circuit 10, and the image reading circuit 2 starts reading the fingerprint. Since the clear fingerprint image data can be read reliably, correct authentication can be performed. If the convex part of the finger FN is not sufficiently adhered to the contact surface 32a of the image reading circuit 2, the contact pressure level between the finger FN and the surface of the pressure sensor 50 is smaller than the threshold value. Therefore, when reading in this state, The fingerprint image may be unclear. However, 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 critical or higher, the image reading circuit 2 does not perform an image reading operation. It is fully pressed, so the read fingerprint image data is not in an indistinct state. On the contrary, if the pressure sensor 50 determines that the pressing force of the finger FN is pressing, the image reading circuit 2 responds to the sharp fingerprint. The image can be read reliably. In addition, if the upper limit and the lower limit are set at the level of the critical threshold in the comparison circuit 62, only when the contact pressure between the finger FN and the surface of the pressure sensor 50 is an appropriate range, the image reading circuit 2 can perform an image Read action. In this case, by pressing the finger FN strongly on the image reading circuit 2, -26- 200414070, but the height difference of the unevenness of the finger FN is small, which can relieve the difficulty of discriminating the optical fingerprint, or the fingerprint becomes a distorted image and cannot be correctly authenticated . [Second Embodiment] Next, as shown in Figs. 6 to 8, a fingerprint reader 101 that is different from the fingerprint reader 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 of the image reading circuit 2 is abutted to the back of the image reading circuit 2. Furthermore, in the first embodiment described above, although the surface of the pressure sensor 50 and the contact surface 32a of the image reading circuit 2 are on the same plane, in the second embodiment, the pressure sensor 50 overlaps the diffused light guide plate. 15. The surface of the pressure sensor 50 is connected to the back of the diffused light guide plate 15. That is, the fingerprint reading device 101 is constructed 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 32a of the image reading circuit 2 is also applied 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 includes a plurality of electrode lines 5 1, 5 1... Formed on the substrate 56 and extending parallel to the row direction, and a plurality of electrode lines 5 2, 5 2 extending parallel to the column direction. ... a flexible thin layer 5 5 formed on the back surface, and a gasket 5 4 that joins the substrate 56 and the thin layer 55 to cover the periphery of the thin layer 55, a plurality of electrode wires 5 2, 5 2 ... and a plurality of The electrode wires 5 1, 5 1 ... are separated, and the electrode wires 5 2 are orthogonal to the electrode wires 5 1 in a plan view, and the electrode wires 5 1 and the electrode wires 5 2 face each other to adhere the thin layer material 5 5 and the substrate 5 6 Make up. Furthermore, a pressure sensitive ink layer -27-200414070 may be provided on the surface of at least one side of the electrode wire 51 and the electrode wire 52. In this case, the pressure-sensitive ink layer on the electrode wire 51 is arranged so as to overlap with the electrode wire 5 2. The resistance system between the electrode line 5 i and the electrode line 52 is a characteristic that depends on the pressure applied to the pressure-sensitive ink layer, and if the magnitude of the pressure changes, the resistance and the like also change. In this pressure sensor 50, the pressure at the crossing portion can be detected by a resistor or the like at the crossing portion of the electrode line 51 and the electrode line 52. In addition to the circuit configuration shown in Fig. 5, the fingerprint reader 101 of the second embodiment includes an adjustment circuit 102 for adjusting the light intensity of the light source 14 as shown in Fig. 8. Here, the detection circuit 61 outputs a detection signal showing the level of the overall pressure in the plane detected by the pressure sensor 50 to the comparison circuit 62. If the comparison circuit 62 recognizes that the pressure level is within the allowable range of the finger, it outputs the pressure information signal of the pressure level to the drive circuit 1 instead of the trigger signal. The driving circuit 10 outputs a light-emission tone signal of the light source 14 to the adjusting circuit 102 according to the pressure level of the pressure information signal. The adjusting circuit 10 2 causes the light source 14 to emit light in accordance with the brightness of the emitted tone signal. That is, the adjustment circuit 102 starts to make the light source 14 emit light according to the pressure level, and adjusts the level of power supplied to the light source 14 according to the pressure level to adjust the light emission intensity of the light source 14. Moreover, the driving circuit 10 outputs a control signal Bent to the bottom gate driver 12 after the light source 14 emits light, and suitably outputs a read signal to the bottom gate driver 12 and outputs a control signal Tent to the top gate driver 1. 1. It is suitable to output a reset signal to the top gate driver 1 1 and output a control signal Dent to the data driver 13 and it is suitable to output a pre-charge signal to the data driver 13. Among them, the drive circuit 10 is set to have a light emission hue with low light emission brightness of the output light source 14 if the pressure level of the information signal from the comparison circuit 62-28- 200414070 is within a tolerable range and is low (the pressing pressure is small). Signal to the adjustment circuit} 〇 2 'If the pressure level of the pressure information signal from the comparison circuit 62 is within an allowable range and is high (the pressing pressure is high), a light-emission tone signal with a high light-emission luminance is output to the adjustment circuit 102. The constituent elements of the fingerprint reading device 1 0 1 are the same as the constituent elements of the fingerprint reading device 1 except as described above, and the image reading circuit 2, the pressure sensing device 5 0, and the detection circuit 6 1 are omitted. A detailed description of the CPU 6 3, the RAM 6.4, the ROM 0 5 and the memory section 66. Next, the operation and usage of the fingerprint reader 101 will be described. As shown in FIG. 6A, when the contact surface 32a of the image reading circuit 2 is not in contact with anything, since the pressure level of the detection signal output from the detection circuit 61 to the comparison circuit 62 is low, no pressure information signal is output from the comparison circuit 62. To the driving circuit 10, the driving circuit 10 causes the light source 14 to emit light through the adjusting circuit 102. On the other hand, as shown in FIGS. 6B and 7, if the subject places the last section of the finger FN on the contact surface 32 a of the static elimination film 32, the finger FN applies pressure to the pressure sense through the image reading circuit 2.测 器 50 0。 Tester 5 0. Because the pressure level of the detection signal output from the detection circuit 61 to the comparison circuit 62 is high, the comparison circuit 6 2 is based on the pressure level of the detection signal. A pressure information signal is output to the drive circuit 1 to output identification information on which a finger is placed and information on the degree of pressing force. The driving circuit 10 outputs a light-emitting tone signal to the adjusting circuit 102 according to the pressure information signal. The adjustment circuit 10 02 emits light according to this -29-200414070 The hue signal causes the light source 14 to emit light at a predetermined brightness. Among them, the adjustment circuit 丨 02 adjusts according to the information of the light-emitting tone signal, that is, as the pressing force on the contact surface 3 2 a of the image reading circuit 2 is low or high to increase the light intensity of the light source 14. In addition, if the detection signal output from the detection circuit 6 1 to the adjustment circuit 1 is below the level when the static elimination film 3 2 is not placed, that is, when no pressure is applied to the pressure sensor 50. Below the level, the adjustment circuit 102 turns off the light source 14. When the light source 14 emits light, the light is incident on the finger FN from the diffusion light guide plate 15 through the image reading circuit 2, and reflection and scattering are caused by the finger FN. ® On the sensor element 20 located below the convex portion of the finger FN, a sufficient amount of reflected and scattered light is incident, but on the sensor element 20 located below the convex portion of the finger FN, the reflected and scattered light is not sufficiently Incident. After the driving circuit 10 outputs a light-emission tone signal to cause the light source 14 to emit light, as in the first embodiment, it outputs a control signal to the drivers 1 1, 1, 2, and 13 of the image reading circuit 2. Furthermore, the electric signal according to the intensity of the reflected light incident on the sensor elements 20, 20, ... in the image reading circuit 2 through the drivers 1 1, 1, 2, 1 3 is transferred to the driving circuit via the data driver 1 3 10, the level of the electrical signal is detected by the drive circuit 10 to obtain the fingerprint image of the finger FN, and the fingerprint image data is output to the CPU 63. Then, the CPU 63 determines whether the input fingerprint image data is consistent with the registered fingerprint image data of the memory unit 66. Further, the CPU 63 activates the security mode when the visual fingerprint image data is consistent with the registered fingerprint image data, and the CPU 63 activates the normal mode when the visual fingerprint image data is not consistent with the registered fingerprint image data. The effect of this embodiment will be described. -30- 200414070 As the pressure generated by the finger FN becomes smaller or smaller, the contact area between the convex portion of the finger FN and the contact surface 3 2 a becomes smaller. Since the convex portion of the finger FN does not adhere to the contact surface 32 a, there is The reflected light from the convex portion may enter the semiconductor film 23 with 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 becomes stronger, even if the convex portion of the finger FN does not adhere to the contact surface 32a. The reflected light is incident on the semiconductor film 23 at a light intensity. Furthermore, in the case where the pressure generated by the finger FN is large, if the light emission intensity of the light source 14 is strong, the reflected light from the concave portion of the finger FN also enters the semiconductor film 23 with high intensity, and enters the sensor elements 20, 20 · The in-plane intensity distribution of the reflected light of the semiconductor film 23 is substantially uniform and brightens. However, as the pressure generated by the finger FN becomes high, the light emission intensity of the light source 14 is low, so this problem does not occur. Therefore, in this embodiment, the fingerprint image of the finger FN can be clearly read by the image reading circuit 2 even if the pressure generated by the finger FN is any situation. Furthermore, the fingerprint reading device 101 of the second embodiment can also perform the same functions as the fingerprint reading device 1 of the first embodiment. In addition, such an image input device can be applied as a door-type personal authentication system or a solid-state identification image input device for access restriction, such as a personal computer. In particular, the image input device is compact and consumes power such as a mobile phone, a notebook computer or a PDA Or carry-on machines with restricted size are particularly effective. In addition, 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 -31- 200414070 shown in FIG. 5, as shown in FIG. 8. It is also possible to provide an adjustment circuit 102 that adjusts the light emission intensity of the light source 14. The present invention is not limited to the above embodiments, and various improvements and design changes may be made without departing from the scope of the present invention. Although the finger FN is read in each of the embodiments described above, the finger FN is not limited to the finger FN, and may be read by pressing other various objects on the contact surface 32 a of the static elimination film 32. If the subject is pressed against the contact surface 32a of the static elimination film 32, the image reading circuit 2 can read the appearance (including the meaning of characters, numbers, and drawings) drawn on the surface of the subject, or can read the image Circuit 2 reads a pattern defined by the unevenness on the surface of the subject. In each of the above embodiments, although the mounting surface on which the subject is placed is the contact surface 32a of the static elimination film 32, it may be a surface of an insulating film disposed on the static elimination film 32, and it is not provided. The static elimination film 32 may be used. A fingerprint reading device 1 〇1 having a structure in which a pressure sensor 50 is arranged below the image reading circuit 2 in the second embodiment described above may not necessarily be provided with an adjustment circuit 10 2 as shown in FIG. 8. A circuit configuration not shown in FIG. 5 is also possible. In addition, the fingerprint reader 1 provided with a structure in which the pressure sensor 50 is arranged so as not to overlap with the image reading circuit 2 in the first embodiment does not necessarily have a circuit configuration like FIG. The circuit configuration shown in FIG. 8 is also possible. In each of the above-mentioned embodiments, "the photoelectric conversion element is described using the image reading circuit 2 using the sensor elements 20, 20, ..." as examples.-32- 200414070 The photoelectric conversion element is applicable to the use of the photoelectric conversion element 2 A polar body image reading circuit is also possible. The image reading circuit using a photodiode includes a CCD image sensor and a CMOS image sensor. In the C CD image sensor, a photodiode system is formed in a matrix on a substrate and each pixel is formed. Around each photodiode, a vertical CCD for transmitting electrical signals that are photoelectrically converted by the photodiode is formed. 、 Horizontal CCD 〇 In the CMOS image sensor, the photodiode system is formed in a matrix on the substrate. Each pixel is formed. Around each photodiode is equipped with an electrical signal that is amplified by the photodiode photoelectric conversion. Used pixel circuit. Furthermore, the present invention is not limited to the above-mentioned optical sensor, and a non-optical sensor that reads a change in electrical characteristics caused by an electrostatic capacitance inherent in a finger may read an image such as a fingerprint. (5) Brief Description of Drawings FIG. 1 is a plan view showing a fingerprint reading device to which the present invention is applied. FIG. 2A is a cross-sectional view showing a state where a finger is not placed by dotted lines (Π)-(Π) in FIG. 1, and FIG. 2B is a placement display by dotted lines (π)-(Π) in FIG. 1 Sectional view with finger. Brother 3 is a cross-sectional view showing the image reading circuit included in the fingerprint reader by the dotted line (melon)-(dish) shown in Figure 1. Figure 4A is a top view showing one pixel of the image reading circuit, and Figure 4B is a sectional view of the (IVB)-(IVB) section. Fig. 5 is a block diagram showing the circuit configuration of the above-mentioned fingerprint reading device. -33- 200414070. Fig. 6A is a sectional view showing a state where a finger is not placed on a fingerprint reading device different from the above-mentioned fingerprint reading device. The figure is a sectional view showing a state where 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 a circuit configuration of the fingerprint reading device shown in Fig. 7. [Symbol description] 1. 101 Fingerprint reading device 2 Image reading circuit 8 Image input area 10 Driving 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 Opening portion 17 Transparent substrate 20 Sensor element 2 1 Bottom gate electrode 22 Bottom gate insulation film 23 Semiconductor film 24 Channel protection film

-34- 26 雜質半導體膜-34- 26 impurity semiconductor film

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 5 2 電極線Source electrode Drain electrode Top gate insulation film Top gate electrode Protective insulation film Static elimination film Contact surface Bottom gate line Reference voltage line Data line Top gate line Pressure sensor 5 2 Electrode line

間隔物 密封墊 薄層材 基板 檢測電路 比較電路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-

Claims (1)

200414070 拾、申請專利範圍·· 1 · 一種影像輸入裝置，包含： 酉己置於載置有被檢體的載置面下的影像讀取電路；以 及 胃由賦予該載置面的壓力檢測該被檢體被載置於該載 置面的檢測手段。 2，如申請專利範圍第丨項所述之影像輸入裝置，其中更具 ^ _由在該檢測手段檢測該被檢體被載置於該載置面的 情形’在該影像讀取電路使影像讀取動作進行的驅動手 段。 3 ·如申請專利範圍第1項所述之影像輸入裝置，其中該檢 測手段具備： 檢測賦予該載置面的壓力的壓力感測器；以及 對分隔以該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比較，在達到該臨界値的情形輸出 使影像讀取動作進行用的觸發信號給該影像讀取電路的 比較手段。 4·如申請專利範圍第3項所述之影像輸入裝置，其中具備 根據該觸發信號使該被檢體發光的光源。 5 ·如申請專利範圍第1項所述之影像輸入裝置，其中具備 依照該被檢體賦予該載置面的壓力，調節對該被檢體照 射光用的光源的亮度的調節手段。 6 .如申請專利範圍第1項所述之影像輸入裝置，其中該影 像讀取電路係配置於該載置面的第一區域，該檢測手段 一 3 6 - 200414070 係配置於該載置面的第二區域。 7 ·如申請專利範_第1項所述之影像輸入裝置，其中該第 一區域係載置有由手指的第一關節到尖端的部分之區域 ’該第二區域係載置有由手指的第二關節到第一關節的 部分之區域。 8 _如申請專利範圍第1項所述之影像輸入裝置，其中該影 像讀取電路具有光學式感測器。 9 ·如申請專利範圍第8項所述之影像輸入裝置，其中該光 學式感測器係具有排列成矩陣狀的複數個雙閘極型電晶 體。 1 〇 ·如申請專利範圍第1項所述之影像輸入裝置，其中更具 備保持該被檢體的保持部，以對該影像讀取電路以及該 檢測手段的位置適切地載置有該被檢體。 1 1. 一種影像輸入裝置，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 配置於該影像讀取電路的下方，藉由賦予該載置面的 壓力檢測該被檢體被載置於該載置面的檢測手段。 1 2 .如申請專利範圍第1 1項所述之影像輸入裝置，其中更具 備藉由在該檢測手段檢測該被檢體被載置於該載置面的 情形，在該影像讀取電路使影像讀取動作進行的驅動手 段。 1 3 .如申請專利範圍第1 2項所述之影像輸入裝置，其中該檢 測手段具備： 37- 200414070 才食測賦予該載置面的壓力的壓力感測器；以及 ^ #隔以該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比較，在超過該臨界値的情形輸出 使影像讀取動作進行用的觸發信號給該影像讀取電路的 比較手段。 1 4 ·如申請專利範圍第1 1項所述之影像輸入裝置，其中在該 影像讀取電路與該檢測手段之間配置有對該被檢體照射 光的光照射手段。 1 5 .如申請專利範圍第1 4項所述之影像輸入裝置，其中該光 照射手段具有引導在藉由該檢測手段使該被檢體被檢測 的情形下發出的光源的光到該被檢體的擴散導光板。 16·如申請專利範圍第n項所述之影像輸入裝置，其中具備 依照該被檢體賦予該載置面的壓力，調節對該被檢體照 射光的光源的亮度的調節手段。 1 7 ·如申請專利範圍第1 1項所述之影像輸入裝置，其中該影 像讀取電路具有光學式感測器。 1 8 ·如申請專利範圍第1 7項所述之影像輸入裝置，其中該光 學式感測器係具有排列成矩陣狀的複數個雙閘極型電晶 體。 1 9 ·如申請專利範圍第1 8項所述之影像輸入裝置，其中更具 備保持該被檢體的保持部，以對該影像讀取電路以及該 檢測手段的位置適切地載置有該被檢體。 20.—種影像輸入裝置’包含： 根據載置有手指的壓力輸出檢測信號的檢測手段； -38 - 200414070 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 藉由該檢測信號使該複數個感測器元件的影像讀取動 作開始的驅動電路。200414070 Scope of Patent Application ·· 1 · An image input device including: an image reading circuit that has been placed under a mounting surface on which a subject is placed; and a pressure detected by the stomach on the mounting surface to detect the The detection means on which the subject is placed on the mounting surface. 2. The image input device as described in item 丨 of the patent application scope, wherein it is more ^ _ detected by the detection means that the subject is placed on the mounting surface 'enable the image in the image reading circuit Driving means for reading operation. 3. The image input device according to item 1 of the scope of patent application, wherein the detection means includes: a pressure sensor that detects a pressure applied to the mounting surface; and a pressure level that is separated by the pressure sensor and is detected by the pressure sensor. The critical state of the mounted state is compared with the critical state of the unmounted state. When the critical state is reached, a trigger signal for performing an image reading operation is output to the comparison means of the image reading circuit. 4. The image input device according to item 3 of the scope of patent application, which includes a light source that causes the subject to emit light according to the trigger signal. 5. The image input device according to item 1 of the scope of patent application, further comprising an adjusting means for adjusting the brightness of a light source for irradiating the subject in accordance with the pressure applied to the mounting surface by the subject. 6. The image input device according to item 1 of the scope of patent application, wherein the image reading circuit is arranged in the first area of the mounting surface, and the detection means 3 6-200414070 is arranged on the mounting surface. The second area. 7 · The image input device according to the patent application _ item 1, wherein the first region is a region where a portion from the first joint of the finger to the tip is placed; and the second region is a region where the finger is placed. The area from the second joint to the first joint. 8 _ The image input device according to item 1 of the scope of patent application, wherein the image reading circuit has an optical sensor. 9. The image input device according to item 8 of the scope of the patent application, wherein the optical sensor has a plurality of double-gate electric crystals arranged in a matrix. 1 〇. The image input device according to item 1 of the scope of patent application, further comprising a holding portion for holding the subject to appropriately place the subject under inspection on the image reading circuit and the detection means. body. 1 1. An image input device comprising: an image reading circuit disposed under a mounting surface on which a subject is placed; and an image reading circuit disposed below the image reading circuit and detecting a pressure provided to the mounting surface The subject is placed on a detection means of the mounting surface. 12. The image input device according to item 11 of the scope of patent application, which further includes detecting the situation where the subject is placed on the mounting surface by the detecting means, and using the image reading circuit to Driving means for image reading operation. 1 3. The image input device according to item 12 of the scope of patent application, wherein the detection means includes: 37-200414070 pressure sensor for measuring the pressure given to the mounting surface; and ^ # separated by the pressure The pressure level detected by the sensor is compared with a critical threshold between the mounted state and the unmounted state. When the threshold level is exceeded, a trigger signal for performing an image reading operation is output to the comparison means of the image reading circuit. 14 The image input device according to item 11 of the scope of patent application, wherein a light irradiation means for irradiating light to the subject is arranged between the image reading circuit and the detection means. 15. The image input device according to item 14 of the scope of patent application, wherein the light irradiating means has a light source that guides light from a light source emitted when the subject is detected by the detecting means to the subject. Volume diffuser light guide. 16. The image input device according to item n of the scope of application for a patent, which comprises means for adjusting the brightness of a light source radiating light to the subject in accordance with the pressure applied to the mounting surface by the subject. 1 7 · The image input device according to item 11 of the patent application scope, wherein the image reading circuit has an optical sensor. 18 · The image input device according to item 17 of the scope of patent application, wherein the optical sensor has a plurality of double-gate electric crystals arranged in a matrix. 1 9 · The image input device according to item 18 of the scope of patent application, which further includes a holding portion for holding the subject to appropriately place the subject on the image reading circuit and the detection means. Specimen. 20. —An image input device 'includes: a detection means that outputs a detection signal based on a pressure on which a finger is placed; -38-200414070 When a finger is placed on the detection means, it is disposed below a portion having a fingerprint of the finger, A plurality of sensor elements that reads the images according to the unevenness of the finger; and a driving circuit that starts the image reading operation of the plurality of sensor elements by the detection signal. -39--39-
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KR100716046B1 (en) 2007-05-09

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