TWI734577B - Fingerprint identification apparatus and fingerprint identification method thereof - Google Patents

Fingerprint identification apparatus and fingerprint identification method thereof Download PDF

Info

Publication number
TWI734577B
TWI734577B TW109126649A TW109126649A TWI734577B TW I734577 B TWI734577 B TW I734577B TW 109126649 A TW109126649 A TW 109126649A TW 109126649 A TW109126649 A TW 109126649A TW I734577 B TWI734577 B TW I734577B
Authority
TW
Taiwan
Prior art keywords
electrode layer
fingerprint recognition
fingerprint
signal
control circuit
Prior art date
Application number
TW109126649A
Other languages
Chinese (zh)
Other versions
TW202119267A (en
Inventor
王地寶
Original Assignee
神盾股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 神盾股份有限公司 filed Critical 神盾股份有限公司
Publication of TW202119267A publication Critical patent/TW202119267A/en
Application granted granted Critical
Publication of TWI734577B publication Critical patent/TWI734577B/en

Links

Images

Classifications

    • 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
    • G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing

Landscapes

  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Image Input (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

A fingerprint identification apparatus and a fingerprint identification method thereof are provided. During a receiving period, receiving an ultrasonic sensing signal generated by a first electrode layer reacting to a reflected ultrasonic signal. During a capacitance sensing period, receiving a capacitive sensing signal provided by the first electrode layer, the capacitive sensing signal is generated in response to a change in capacitance between the first electrode layer and a finger. One of the first fingerprint image corresponding to the ultrasonic sensing signal and the second fingerprint image corresponding to the capacitive sensing signal is selected for fingerprint recognition processing. One of a first fingerprint image corresponding to the ultrasonic sensing signal and a second fingerprint image corresponding to the capacitive sensing signal is selected for fingerprint recognition processing.

Description

指紋辨識裝置及其指紋辨識方法Fingerprint identification device and fingerprint identification method

本發明是有關於一種辨識裝置，且特別是有關於一種指紋辨識裝置及其指紋辨識方法。The present invention relates to an identification device, and particularly relates to a fingerprint identification device and a fingerprint identification method.

現今指紋辨識廣泛運用於各種電子產品上，又以可攜式行動裝置例如是手機（Smart phone）、平板電腦（Tablet computer）最為常見。應用於智慧型手機的指紋辨識，目前常見的指紋識別裝置可分為光學式、電容式、超音波式等，其中以電容式指紋辨識裝置為其主流。然在某些情形下，電容式指紋辨識裝置並無法有效地辨識指紋，例如使用者的手指或指紋辨識面板上具有水滴或手指非常潮濕時，將影響電容式指紋辨識裝置取得清晰的指紋影像，而無法進行指紋辨識。相較於電容式指紋辨識裝置，超音波指紋識別裝置的辨識結果較不易受環境溫度、濕度的影響，然其具有清晰度低於電容式指紋辨識裝置的缺點。Nowadays, fingerprint recognition is widely used in various electronic products, and portable mobile devices such as smart phones and tablet computers are the most common. Applied to fingerprint recognition of smart phones, the current common fingerprint recognition devices can be divided into optical, capacitive, ultrasonic, etc., of which capacitive fingerprint recognition devices are the mainstream. However, in some cases, the capacitive fingerprint recognition device cannot effectively recognize fingerprints. For example, when the user’s finger or fingerprint recognition panel has water droplets or the finger is very wet, it will affect the capacitive fingerprint recognition device to obtain a clear fingerprint image. It cannot perform fingerprint recognition. Compared with capacitive fingerprint recognition devices, the recognition results of ultrasonic fingerprint recognition devices are less susceptible to environmental temperature and humidity, but they have the disadvantage of lower resolution than capacitive fingerprint recognition devices.

本發明提供一種指紋辨識裝置及其指紋辨識方法，可因應指紋辨識裝置所處的環境條件，取得最清晰的指紋影像進行指紋辨識，而提高指紋辨識裝置的使用品質。The invention provides a fingerprint identification device and a fingerprint identification method, which can obtain the clearest fingerprint image for fingerprint identification in accordance with the environmental conditions of the fingerprint identification device, thereby improving the use quality of the fingerprint identification device.

本發明的指紋辨識裝置包括感測單元以及控制電路。感測單元包括第一電極層以及第二電極層。控制電路耦接第一電極層以及第二電極層，控制電路於發射期間提供致動電壓至感測單元，而使感測單元發射超音波信號至手指而產生反射超音波信號，第一電極層於接收期間接收反射超音波信號而對應產生超音波感測信號，第一電極層於電容感測期間反應第一電極層與手指間的電容值變化而產生電容感測信號，控制電路自對應超音波感測信號的第一指紋影像與對應電容感測信號的第二指紋影像中選擇其一進行指紋辨識處理。The fingerprint recognition device of the present invention includes a sensing unit and a control circuit. The sensing unit includes a first electrode layer and a second electrode layer. The control circuit is coupled to the first electrode layer and the second electrode layer. The control circuit provides an actuation voltage to the sensing unit during the emission period, so that the sensing unit emits an ultrasonic signal to the finger to generate a reflected ultrasonic signal. The first electrode layer During the receiving period, the reflected ultrasonic signal is received and the ultrasonic sensing signal is generated correspondingly. The first electrode layer responds to the capacitance change between the first electrode layer and the finger during the capacitance sensing period to generate the capacitance sensing signal, and the control circuit corresponds to the ultrasonic sensing signal. One of the first fingerprint image of the acoustic wave sensing signal and the second fingerprint image corresponding to the capacitive sensing signal is selected for fingerprint recognition processing.

本發明還提供一種指紋辨識裝置的指紋辨識方法。指紋辨識裝置包括感測單元，感測單元包括第一電極層以及第二電極層。指紋辨識裝置的指紋辨識方法包括下列步驟。於發射期間提供致動電壓至感測單元，而使感測單元發射超音波信號至手指而產生反射超音波信號。於接收期間接收第一電極層反應反射超音波信號所產生的超音波感測信號。於電容感測期間接收第一電極層反應第一電極層與手指間的電容值變化所產生的電容感測信號。自對應超音波感測信號的第一指紋影像與對應電容感測信號的第二指紋影像中選擇其一進行指紋辨識處理。The invention also provides a fingerprint identification method of the fingerprint identification device. The fingerprint recognition device includes a sensing unit, and the sensing unit includes a first electrode layer and a second electrode layer. The fingerprint identification method of the fingerprint identification device includes the following steps. During the transmission period, an actuation voltage is provided to the sensing unit, so that the sensing unit transmits an ultrasonic signal to the finger to generate a reflected ultrasonic signal. During the receiving period, receiving the ultrasonic sensing signal generated by the reflection of the ultrasonic signal by the first electrode layer. During the capacitance sensing period, a capacitance sensing signal generated by the first electrode layer in response to the capacitance change between the first electrode layer and the finger is received. One of the first fingerprint image corresponding to the ultrasonic sensing signal and the second fingerprint image corresponding to the capacitive sensing signal is selected for fingerprint recognition processing.

基于上述，本發明實施例的控制電路可自對應超音波感測信號的第一指紋影像與對應電容感測信號的第二指紋影像中選擇其一進行指紋辨識處理。由於利用超音波感測信號取得的第一指紋影像較不受環境影響，例如不會受到手指或指紋辨識面板上的水滴影響，因此指紋辨識裝置仍可取得清晰的指紋影像進行指紋辨識，而不會因環境條件的變化無法正常地辨識指紋，而當對應電容感測信號的第二指紋影像不受到環境影響時，指紋辨識裝置取得清晰度較佳的第二指紋影像進行指紋辨識。如此因應指紋辨識裝置所處的環境條件採用最清晰的指紋影像進行指紋辨識，可有效提高指紋辨識裝置的使用品質。Based on the above, the control circuit of the embodiment of the present invention can select one of the first fingerprint image corresponding to the ultrasonic sensing signal and the second fingerprint image corresponding to the capacitance sensing signal to perform fingerprint recognition processing. Since the first fingerprint image obtained by the ultrasonic sensing signal is relatively unaffected by the environment, for example, it will not be affected by the water droplets on the finger or the fingerprint recognition panel, the fingerprint recognition device can still obtain a clear fingerprint image for fingerprint recognition. The fingerprint can not be recognized normally due to changes in environmental conditions, and when the second fingerprint image corresponding to the capacitive sensing signal is not affected by the environment, the fingerprint recognition device obtains the second fingerprint image with better clarity for fingerprint recognition. In this way, the clearest fingerprint image is used for fingerprint recognition in accordance with the environmental conditions of the fingerprint recognition device, which can effectively improve the quality of use of the fingerprint recognition device.

圖1是依照本發明的實施例的一種指紋辨識裝置的示意圖，請參照圖1。指紋辨識裝置可包括電極層104、電極層106構成的感測單元SU1以及控制電路108，其中電極層104配置於蓋板102與電極層106之間，控制電路108耦接電極層104以及電極層106。蓋板102可例如以玻璃來實施，然不以此為限，在其它實施例中蓋板102也可例如以樹脂等透明的硬質材料來實施。蓋板102可提供檢測面供使用者放置手指，以進行指紋辨識操作。控制電路108可控制電極層106發射超音波信號，並自接收電極層104接收指紋感測信號。FIG. 1 is a schematic diagram of a fingerprint recognition device according to an embodiment of the present invention. Please refer to FIG. 1. The fingerprint recognition device may include an electrode layer 104, a sensing unit SU1 composed of an electrode layer 106, and a control circuit 108. The electrode layer 104 is disposed between the cover plate 102 and the electrode layer 106, and the control circuit 108 is coupled to the electrode layer 104 and the electrode layer. 106. The cover plate 102 can be implemented by, for example, glass, but is not limited to this. In other embodiments, the cover plate 102 can also be implemented by a transparent hard material such as resin. The cover 102 can provide a detection surface for the user to place a finger for fingerprint recognition operation. The control circuit 108 can control the electrode layer 106 to emit ultrasonic signals and receive fingerprint sensing signals from the receiving electrode layer 104.

進一步來說，在超音波感測模式中，控制電路108可在發射期間提供致動電壓給感測單元SU1，以使感測單元SU1發射超音波信號至使用者的手指F1。舉例來說，控制電路108可在發射期間提供致動電壓給電極層106，電極層106可透過與電極層104間的靜電吸引力帶動電極層104一起振動而使感測單元SU1發射超音波信號至使用者的手指F1，超音波信號經手指F1反射後產生反射超音波信號。電極層104於接收期間接收反射超音波信號而產生振動，進而使得電極層104與電極層106間的電容值產生變化。電極層104可反應電極層104與電極層106間的電容值變化將反射超音波信號轉為電信號，而產生超音波感測信號。Furthermore, in the ultrasonic sensing mode, the control circuit 108 can provide an actuation voltage to the sensing unit SU1 during the transmitting period, so that the sensing unit SU1 transmits ultrasonic signals to the user's finger F1. For example, the control circuit 108 can provide an actuation voltage to the electrode layer 106 during the emission period, and the electrode layer 106 can drive the electrode layer 104 to vibrate together through the electrostatic attraction between the electrode layer 104 and the sensing unit SU1 to emit ultrasonic signals. To the user's finger F1, the ultrasonic signal is reflected by the finger F1 to generate a reflected ultrasonic signal. During the receiving period, the electrode layer 104 receives the reflected ultrasonic signal and vibrates, which in turn causes the capacitance value between the electrode layer 104 and the electrode layer 106 to change. The electrode layer 104 can convert the reflected ultrasonic signal into an electrical signal in response to the change in the capacitance value between the electrode layer 104 and the electrode layer 106 to generate an ultrasonic sensing signal.

在電容感測模式中，電極層104可在電容感測期間反應電極層104與手指F1間的電容值變化，進而產生電容感測信號。控制電路108可依據超音波感測信號獲取相對應之第一指紋影像，而依據電容感測信號獲取相對應之第二指紋影像，並自第一指紋影像與第二指紋影像中選擇其一進行指紋辨識處理。In the capacitance sensing mode, the electrode layer 104 can react to the change of the capacitance value between the electrode layer 104 and the finger F1 during the capacitance sensing period, thereby generating a capacitance sensing signal. The control circuit 108 can obtain the corresponding first fingerprint image according to the ultrasonic sensing signal, and obtain the corresponding second fingerprint image according to the capacitance sensing signal, and select one of the first fingerprint image and the second fingerprint image to proceed. Fingerprint recognition processing.

當指紋辨識裝置放置於水中、蓋板102提供的檢測面上有水滴，或使用者以濕手指進行指紋辨識操作時，由於超音波感測信號不易受到環境條件(如溫度與濕度)影響，因此，利用超音波感測信號取得之第一指紋影像的清晰度不會受到影響，因此控制電路108可利用第一指紋影像進行指紋辨識處理。而當指紋辨識裝置處於正常的操作環境時，例如指紋辨識裝置處於乾燥的環境中，且在進行指紋辨識操作時使用者的手指F1與蓋板102間無可影響電極層104在電容感測期間進行指紋感測的水或其它液體存在時，控制電路108可利用清晰度較佳的第二指紋影像進行指紋辨識處理。如此不論指紋辨識裝置所處的環境如何，控制電路108可正常地進行指紋辨識，且可彈性的依照使用者的手指潮濕狀態或環境狀態，選擇最合適之感測機制，可提高指紋辨識裝置的使用品質，取得最佳之指紋影像。When the fingerprint recognition device is placed in water, there are water droplets on the detection surface provided by the cover 102, or the user performs fingerprint recognition operations with wet fingers, the ultrasonic sensing signal is not easily affected by environmental conditions (such as temperature and humidity). , The clarity of the first fingerprint image obtained by the ultrasonic sensing signal will not be affected, so the control circuit 108 can use the first fingerprint image to perform fingerprint recognition processing. When the fingerprint recognition device is in a normal operating environment, for example, the fingerprint recognition device is in a dry environment, and there is no influence between the user's finger F1 and the cover 102 during the fingerprint recognition operation. When water or other liquids for fingerprint sensing are present, the control circuit 108 can use the second fingerprint image with better clarity to perform fingerprint recognition processing. In this way, regardless of the environment in which the fingerprint recognition device is located, the control circuit 108 can perform fingerprint recognition normally, and can flexibly select the most suitable sensing mechanism according to the wet state of the user's finger or the environmental state, which can improve the performance of the fingerprint recognition device. Use quality to obtain the best fingerprint image.

此外，由於在超音波感測之接收期間與電容感測期間皆透過同一個電極層(電極層104)進行感測信號的接收，亦即，指紋辨識裝置在超音波感測模式與電容感測模式中共用電極層104產生感測信號，如此可避免額外增加感測晶片的面積與厚度，而可有利於指紋辨識裝置的小型化。In addition, because the sensing signal is received through the same electrode layer (electrode layer 104) during the receiving period of the ultrasonic sensing and the capacitive sensing period, that is, the fingerprint recognition device is in the ultrasonic sensing mode and the capacitive sensing In the mode, the common electrode layer 104 generates a sensing signal, which can avoid additional increase in the area and thickness of the sensing chip, and can facilitate the miniaturization of the fingerprint recognition device.

值得注意的是，控制電路108並不被限定為在特定環境下必須使用第一指紋影像或第二指紋影像進行指紋辨識，控制電路108可依據所獲取的第一指紋影像或第二指紋影像的清晰度來決定進行指紋辨識處理時使用的指紋影像，例如可依據第一指紋影像與第二指紋影像的訊雜比以及對比度至少其中之一來選擇第一指紋影像或第二指紋影像來進行指紋辨識處理。此外，在部份實施例中，控制電路108在發射期間也可改為提供致動電壓給電極層104，電極層104可透過與電極層106間的靜電吸引力帶動電極層106一起振動而使感測單元發射超音波信號至使用者的手指F1。It is worth noting that the control circuit 108 is not limited to use the first fingerprint image or the second fingerprint image for fingerprint recognition in a specific environment, and the control circuit 108 can be based on the acquired first fingerprint image or the second fingerprint image. The resolution determines the fingerprint image used in the fingerprint recognition process. For example, the first fingerprint image or the second fingerprint image can be selected for fingerprinting according to at least one of the signal-to-noise ratio and contrast of the first fingerprint image and the second fingerprint image Identification process. In addition, in some embodiments, the control circuit 108 can also be changed to provide an actuation voltage to the electrode layer 104 during the emission period. The electrode layer 104 can drive the electrode layer 106 to vibrate through the electrostatic attraction between the electrode layer 106 and the electrode layer 106. The sensing unit emits ultrasonic signals to the user's finger F1.

圖2是依照本發明另一實施例的一種指紋辨識裝置的示意圖，請參照圖2。在本實施例中，控制電路108可包括發射控制電路202、接收控制電路204、電容感測控制電路206、切換電路208以及處理電路210，切換電路208耦接發射控制電路202、接收控制電路204、電極層104以及電極層106，處理電路210耦接至接收控制電路204與電容感測控制電路206。切換電路208可在不同的期間將發射控制電路202、接收控制電路204以及電容感測控制電路206耦接至電極層104或電極層106。FIG. 2 is a schematic diagram of a fingerprint recognition device according to another embodiment of the present invention. Please refer to FIG. 2. In this embodiment, the control circuit 108 may include a transmission control circuit 202, a reception control circuit 204, a capacitance sensing control circuit 206, a switching circuit 208, and a processing circuit 210. The switching circuit 208 is coupled to the transmission control circuit 202 and the reception control circuit 204. , The electrode layer 104 and the electrode layer 106, the processing circuit 210 is coupled to the receiving control circuit 204 and the capacitance sensing control circuit 206. The switching circuit 208 can couple the transmission control circuit 202, the reception control circuit 204, and the capacitance sensing control circuit 206 to the electrode layer 104 or the electrode layer 106 in different periods.

舉例來說，如圖3所示，切換控制信號S1~S3分別用以控制發射控制電路202、接收控制電路204、電容感測控制電路206與電極層104以及電極層106的耦接狀態。在發射期間T1，切換電路208依據切換控制信號S1將發射控制電路202耦接至電極層106，以使發射控制電路202可透過切換電路208提供致動電壓給電極層106，進而發射超音波信號。在接收期間T2，切換電路208依據切換控制信號S2將接收控制電路204耦接至電極層104，以使接收控制電路204可透過切換電路208接收電極層104輸出的超音波感測信號，並產生對應的第一指紋影像。在電容感測期間T3，切換電路208依據切換控制信號S3將電容感測控制電路206耦接至電極層104，以使電容感測控制電路206可透過切換電路208接收電極層104輸出的電容感測信號，並產生對應的第二指紋影像。處理電路210則自接收控制電路204與電容感測控制電路206接收第一指紋影像與第二指紋影像，並自第一指紋影像與第二指紋影像中選擇其一進行指紋辨識處理，例如可選擇清晰度較佳的指紋影像進行指紋辨識處理。For example, as shown in FIG. 3, the switching control signals S1 to S3 are used to control the coupling state of the transmission control circuit 202, the reception control circuit 204, the capacitance sensing control circuit 206 and the electrode layer 104 and the electrode layer 106, respectively. During the emission period T1, the switching circuit 208 couples the emission control circuit 202 to the electrode layer 106 according to the switching control signal S1, so that the emission control circuit 202 can provide an actuation voltage to the electrode layer 106 through the switching circuit 208, and then emit an ultrasonic signal . During the receiving period T2, the switching circuit 208 couples the receiving control circuit 204 to the electrode layer 104 according to the switching control signal S2, so that the receiving control circuit 204 can receive the ultrasonic sensing signal output by the electrode layer 104 through the switching circuit 208, and generate The corresponding first fingerprint image. During the capacitance sensing period T3, the switching circuit 208 couples the capacitance sensing control circuit 206 to the electrode layer 104 according to the switching control signal S3, so that the capacitance sensing control circuit 206 can receive the capacitance sensing output from the electrode layer 104 through the switching circuit 208. Detect the signal and generate the corresponding second fingerprint image. The processing circuit 210 receives the first fingerprint image and the second fingerprint image from the receiving control circuit 204 and the capacitance sensing control circuit 206, and selects one of the first fingerprint image and the second fingerprint image for fingerprint recognition processing, for example, you can select Fingerprint images with better clarity are processed for fingerprint recognition.

圖4是依照本發明另一實施例的一種指紋辨識裝置的示意圖，請參照圖4。在本實施例中，指紋辨識裝置的感測單元SU1包括電極層402~電極層404，其中電極層404配置於蓋板102與電極層406之間，電極層402配置於蓋板102與電極層408之間，電極層402、404以及406耦接切換電路208。在本實施例中，電極層404與電極層406用以於發射期間反應致動電壓進行振動而發射超音波信號至手指F1以產生反射超音波信號。電極層402於接收期間接收反射超音波信號，並反應電極層402與電極層408間的電容值變化將反射超音波信號轉為電信號，以產生超音波感測信號。此外，電極層402並於電容感測期間反應電極層402與手指F1間的電容值變化，產生電容感測信號。FIG. 4 is a schematic diagram of a fingerprint recognition device according to another embodiment of the present invention. Please refer to FIG. 4. In this embodiment, the sensing unit SU1 of the fingerprint recognition device includes an electrode layer 402 to an electrode layer 404, wherein the electrode layer 404 is disposed between the cover plate 102 and the electrode layer 406, and the electrode layer 402 is disposed on the cover plate 102 and the electrode layer. Between 408, the electrode layers 402, 404, and 406 are coupled to the switching circuit 208. In this embodiment, the electrode layer 404 and the electrode layer 406 are used to transmit an ultrasonic signal to the finger F1 by vibrating in response to the actuation voltage during the transmission period to generate a reflected ultrasonic signal. The electrode layer 402 receives the reflected ultrasonic signal during the receiving period, and converts the reflected ultrasonic signal into an electrical signal in response to the change in capacitance between the electrode layer 402 and the electrode layer 408 to generate an ultrasonic sensing signal. In addition, the electrode layer 402 reacts to changes in the capacitance value between the electrode layer 402 and the finger F1 during the capacitance sensing period to generate a capacitance sensing signal.

舉例來說，如圖5所示，在發射期間T1，切換電路208依據切換控制信號S1將發射控制電路202耦接至電極層406，以使發射控制電路202可透過切換電路208提供致動電壓給電極層404或406，以發射超音波信號，例如可提供致動電壓給電極層404，使電極層404透過靜電吸引力帶動電極層406進行振動。在接收期間T2，切換電路208依據切換控制信號S2將接收控制電路204耦接至電極層402，以使接收控制電路204可透過切換電路208接收電極層402輸出的超音波感測信號，並產生對應的第一指紋影像。在電容感測期間T3，切換電路208依據切換控制信號S3將電容感測控制電路206耦接至電極層402，以使電容感測控制電路206可透過切換電路208接收電極層402輸出的電容感測信號，並產生對應的第二指紋影像。處理電路210則自接收控制電路204與電容感測控制電路206接收第一指紋影像與第二指紋影像，並自第一指紋影像與第二指紋影像中選擇其一進行指紋辨識處理。For example, as shown in FIG. 5, during the emission period T1, the switching circuit 208 couples the emission control circuit 202 to the electrode layer 406 according to the switching control signal S1, so that the emission control circuit 202 can provide an actuation voltage through the switching circuit 208 The electrode layer 404 or 406 is used to emit ultrasonic signals. For example, an actuation voltage can be provided to the electrode layer 404 so that the electrode layer 404 drives the electrode layer 406 to vibrate through electrostatic attraction. During the receiving period T2, the switching circuit 208 couples the receiving control circuit 204 to the electrode layer 402 according to the switching control signal S2, so that the receiving control circuit 204 can receive the ultrasonic sensing signal output by the electrode layer 402 through the switching circuit 208, and generate The corresponding first fingerprint image. During the capacitance sensing period T3, the switching circuit 208 couples the capacitance sensing control circuit 206 to the electrode layer 402 according to the switching control signal S3, so that the capacitance sensing control circuit 206 can receive the capacitance sensing output from the electrode layer 402 through the switching circuit 208. Detect the signal and generate the corresponding second fingerprint image. The processing circuit 210 receives the first fingerprint image and the second fingerprint image from the receiving control circuit 204 and the capacitance sensing control circuit 206, and selects one of the first fingerprint image and the second fingerprint image to perform fingerprint recognition processing.

值得注意的是，在圖5實施例中，發射期間T1部份重疊於接收期間T2，以使接收控制電路204可接收到信號品質較佳的超音波感測信號(例如訊雜比高的超音波感測信號)，然不以此為限。在其它實施例中，也可依實際需求使發射期間T1不與接收期間T2重疊。It is worth noting that in the embodiment of FIG. 5, the transmitting period T1 partially overlaps the receiving period T2, so that the receiving control circuit 204 can receive the ultrasonic sensing signal with better signal quality (for example, the ultrasonic signal with high signal-to-noise ratio). Acoustic sensing signal), but not limited to this. In other embodiments, the transmitting period T1 and the receiving period T2 may not overlap with the receiving period T2 according to actual requirements.

圖6是依照本發明另一實施例的一種指紋辨識裝置的示意圖。進一步來說，圖2實施例的感測單元SU1的實施方式可如圖6所示，電極層104與電極層106間具有空腔H1，而形成電容式微型超音波換能器(Capacitive Micromachined Ultrasonic Transducer，CMUT)的結構。在發射期間，發射控制電路202可透過切換電路208提供致動電壓給電極層104或106，以使電極層104或106振動而發射超音波信號至手指F1，而產生反射超音波信號。在接收期間，電極層104與電極層106可接收反射超音波信號而產生振動，使電極層104與電極層106間的電容值產生變化，電極層104可反應電極層104與電極層106間的電容值變化將反射超音波信號轉為電信號，而產生超音波感測信號給接收控制電路204。在電容感測期間，電極層104可反應電極層104與手指F1間的電容值變化而提供電容感測信號給電容感測控制電路206。處理電路210則可自接收控制電路204提供的第一指紋影像與電容感測控制電路206提供的第二指紋影像中選擇其一進行指紋辨識處理。此外，圖4實施例中，電極層404與406之間以及電極層402與408之間，也可類似本實施例的感測單元具有空腔，亦即圖4實施例的感測單元也可以電容式微型超音波換能器的結構來實施。Fig. 6 is a schematic diagram of a fingerprint recognition device according to another embodiment of the present invention. Furthermore, the implementation of the sensing unit SU1 of the embodiment of FIG. 2 may be as shown in FIG. 6, a cavity H1 is formed between the electrode layer 104 and the electrode layer 106 to form a capacitive micromachined ultrasonic transducer Transducer, CMUT) structure. During the emission, the emission control circuit 202 can provide an actuation voltage to the electrode layer 104 or 106 through the switching circuit 208, so that the electrode layer 104 or 106 vibrates to emit an ultrasonic signal to the finger F1, thereby generating a reflected ultrasonic signal. During the receiving period, the electrode layer 104 and the electrode layer 106 can receive the reflected ultrasonic signal and generate vibration, which changes the capacitance value between the electrode layer 104 and the electrode layer 106. The electrode layer 104 can reflect the difference between the electrode layer 104 and the electrode layer 106. The change in the capacitance value converts the reflected ultrasonic signal into an electrical signal, and generates an ultrasonic sensing signal to the receiving control circuit 204. During the capacitance sensing period, the electrode layer 104 can respond to the capacitance change between the electrode layer 104 and the finger F1 to provide a capacitance sensing signal to the capacitance sensing control circuit 206. The processing circuit 210 can select one of the first fingerprint image provided by the receiving control circuit 204 and the second fingerprint image provided by the capacitance sensing control circuit 206 to perform fingerprint recognition processing. In addition, in the embodiment of FIG. 4, between the electrode layers 404 and 406 and between the electrode layers 402 and 408, the sensing unit of this embodiment may also have a cavity, that is, the sensing unit of the embodiment of FIG. 4 may also The structure of the capacitive miniature ultrasonic transducer is implemented.

圖7是依照本發明實施例的一種指紋辨識裝置的指紋辨識方法的流程圖，指紋辨識裝置包括感測單元，感測單元包括第一電極層以及第二電極層。由上述實施例可知，指紋辨識裝置的指紋辨識方法可至少包括下列步驟。首先，於發射期間，提供致動電壓至感測單元，而使感測單元發射超音波信號至手指而產生反射超音波信號(步驟S702)，例如可提供致動電壓至第一電極層或第二電極層，第一電極層與第二電極層可反應致動電壓振動，而使感測單元發射該超音波信號。接著，於接收期間，接收第一電極層反應反射超音波信號所產生的超音波感測信號(步驟S704)。在部份實施例中，第一電極層與第二電極層間可具有空腔，第一電極層與第二電極層可接收反射超音波信號而產生振動，使第一電極層與第二電極層間的電容值產生變化，第一電極層可反應第一電極層與第二電極層間的電容值變化將反射超音波信號轉換為電信號，而產生超音波感測信號。然後，於電容感測期間，接收第一電極層反應第一電極層與手指間的電容值變化所產生的電容感測信號(步驟S706)。最後，自對應超音波感測信號的第一指紋影像與對應電容感測信號的第二指紋影像中選擇其一進行指紋辨識處理(步驟S708)，例如可依據第一指紋影像與第二指紋影像的訊雜比以及對比度至少其中之一，自第一指紋影像與第二指紋影像中選擇具有較高影像清晰度的指紋影像進行指紋辨識處理。FIG. 7 is a flowchart of a fingerprint recognition method of a fingerprint recognition device according to an embodiment of the present invention. The fingerprint recognition device includes a sensing unit, and the sensing unit includes a first electrode layer and a second electrode layer. It can be seen from the above embodiments that the fingerprint recognition method of the fingerprint recognition device may at least include the following steps. First, during the emission period, an actuation voltage is provided to the sensing unit, and the sensing unit transmits an ultrasonic signal to the finger to generate a reflected ultrasonic signal (step S702), for example, an actuation voltage may be provided to the first electrode layer or the second electrode layer. There are two electrode layers, the first electrode layer and the second electrode layer can react to actuate voltage vibration, so that the sensing unit emits the ultrasonic signal. Then, during the receiving period, the ultrasonic sensing signal generated by the reflection of the ultrasonic signal from the first electrode layer is received (step S704). In some embodiments, there may be a cavity between the first electrode layer and the second electrode layer, and the first electrode layer and the second electrode layer can receive the reflected ultrasonic signal to generate vibration, so that the first electrode layer and the second electrode layer The capacitance value of the first electrode layer can reflect the change of the capacitance value between the first electrode layer and the second electrode layer to convert the reflected ultrasonic signal into an electrical signal to generate an ultrasonic sensing signal. Then, during the capacitance sensing period, the capacitance sensing signal generated by the first electrode layer in response to the capacitance change between the first electrode layer and the finger is received (step S706). Finally, one of the first fingerprint image corresponding to the ultrasonic sensing signal and the second fingerprint image corresponding to the capacitive sensing signal is selected for fingerprint recognition processing (step S708), for example, based on the first fingerprint image and the second fingerprint image At least one of the signal-to-noise ratio and the contrast ratio is selected from the first fingerprint image and the second fingerprint image with a higher image clarity fingerprint image for fingerprint identification processing.

圖8是依照本發明另一實施例的指紋辨識裝置的指紋辨識方法的流程圖。在本實施例中，感測單元可包括第一電極層~第四電極層，其中第二電極層與第三電極層間，以及第一電極層與第四電極層間可分別具有空腔。第二電極層與第三電極層用以於發射期間反應致動電壓進行振動而發射超音波信號至手指，以產生反射超音波信號。第一電極層用以於接收期間接收反射超音波信號，並反應第一電極層與第四電極層間的電容值變化將反射超音波信號轉為電信號，以產生超音波感測信號，並於電容感測期間接收第一電極層反應第一電極層與手指間的電容值變化所產生的電容感測信號。指紋辨識裝置的指紋辨識方法可包括下列步驟。首先，於發射期間提供致動電壓至第二電極層或第三電極層，以使第二電極層與第三電極反應致動電壓發射超音波信號至手指而產生反射超音波信號(步驟S802)。接著，於接收期間接收第一電極層反應第一電極層與第四電極層間的電容值變化而產生的超音波感測信號(步驟S804)，在部份實施例中發射期間部份可重疊於接收期間，然不以此為限。然後，於電容感測期間，接收第一電極層反應第一電極層與手指間的電容值變化所產生的電容感測信號(步驟S806)。最後，自對應超音波感測信號的第一指紋影像與對應電容感測信號的第二指紋影像中選擇其一進行指紋辨識處理(步驟S808)，例如可選擇具有較高影像清晰度的指紋影像進行指紋辨識處理。FIG. 8 is a flowchart of a fingerprint recognition method of a fingerprint recognition device according to another embodiment of the present invention. In this embodiment, the sensing unit may include a first electrode layer to a fourth electrode layer, wherein there may be cavities between the second electrode layer and the third electrode layer, and between the first electrode layer and the fourth electrode layer. The second electrode layer and the third electrode layer are used for transmitting ultrasonic signals to the finger by vibrating in response to the actuating voltage during the transmitting period, so as to generate reflected ultrasonic signals. The first electrode layer is used to receive the reflected ultrasonic signal during the receiving period, and reflect the change in capacitance between the first electrode layer and the fourth electrode layer to convert the reflected ultrasonic signal into an electrical signal to generate an ultrasonic sensing signal. During the capacitance sensing period, the capacitance sensing signal generated by the first electrode layer in response to the capacitance change between the first electrode layer and the finger is received. The fingerprint recognition method of the fingerprint recognition device may include the following steps. First, provide an actuation voltage to the second electrode layer or the third electrode layer during the emission period, so that the second electrode layer and the third electrode react with the actuation voltage to emit an ultrasonic signal to the finger to generate a reflected ultrasonic signal (step S802) . Then, the ultrasonic sensing signal generated by the first electrode layer in response to the change in capacitance between the first electrode layer and the fourth electrode layer is received during the receiving period (step S804). In some embodiments, the transmitting period may partially overlap with the The receiving period is not limited to this. Then, during the capacitance sensing period, a capacitance sensing signal generated by the first electrode layer in response to the capacitance change between the first electrode layer and the finger is received (step S806). Finally, one of the first fingerprint image corresponding to the ultrasonic sensing signal and the second fingerprint image corresponding to the capacitive sensing signal is selected for fingerprint recognition processing (step S808), for example, a fingerprint image with higher image clarity can be selected Perform fingerprint recognition processing.

綜上所述，本實施例的控制電路可自對應超音波感測信號的第一指紋影像與對應電容感測信號的第二指紋影像中選擇其一進行指紋辨識處理。由於利用超音波感測信號取得的第一指紋影像較不受環境影響，例如不會受到手指或指紋辨識面板上的水滴影響，因此指紋辨識裝置仍可取得清晰度較佳的指紋影像進行指紋辨識，而不會因環境條件的變化無法正常地辨識指紋，而當對應電容感測信號的第二指紋影像不受到環境影響時，指紋辨識裝置取得清晰度較佳的第二指紋影像進行指紋辨識。如此因應指紋辨識裝置所處的環境條件採用最清晰的指紋影像進行指紋辨識，可有效提高指紋辨識裝置的使用品質。此外，藉由在超音波感測模式與電容感測模式中共用電極層來產生感測信號(超音波感測信號與電容感測信號)，可避免額外增加感測晶片的面積與厚度，而可有利於指紋辨識裝置的小型化。In summary, the control circuit of this embodiment can select one of the first fingerprint image corresponding to the ultrasonic sensing signal and the second fingerprint image corresponding to the capacitive sensing signal to perform fingerprint recognition processing. Since the first fingerprint image obtained by the ultrasonic sensing signal is relatively unaffected by the environment, for example, it will not be affected by the water droplets on the finger or the fingerprint recognition panel, the fingerprint recognition device can still obtain the fingerprint image with better clarity for fingerprint recognition , Instead of being unable to recognize the fingerprint normally due to changes in environmental conditions, and when the second fingerprint image corresponding to the capacitive sensing signal is not affected by the environment, the fingerprint recognition device obtains the second fingerprint image with better clarity for fingerprint recognition. In this way, the clearest fingerprint image is used for fingerprint recognition in accordance with the environmental conditions of the fingerprint recognition device, which can effectively improve the quality of use of the fingerprint recognition device. In addition, by sharing the electrode layer in the ultrasonic sensing mode and the capacitance sensing mode to generate the sensing signal (ultrasonic sensing signal and capacitance sensing signal), the additional area and thickness of the sensing chip can be avoided. It can be beneficial to the miniaturization of the fingerprint identification device.

102:蓋板 104、106、402~408:電極層 108:控制電路 202:發射控制電路 204:接收控制電路 206:電容感測控制電路 208:切換電路 210:處理電路 F1:手指 S1~S3:切換控制信號 SU1:感測單元 T1:發射期間 T2:接收期間 T3:電容感測期間 H1:空腔 S702~S708、S802~S808:指紋辨識裝置的指紋辨識方法的步驟102: cover 104, 106, 402~408: electrode layer 108: control circuit 202: emission control circuit 204: receiving control circuit 206: Capacitance sensing control circuit 208: switching circuit 210: processing circuit F1: Finger S1~S3: switch control signal SU1: Sensing unit T1: during launch T2: during reception T3: During capacitance sensing H1: Cavity S702~S708, S802~S808: Steps of fingerprint identification method of fingerprint identification device

圖1是依照本發明實施例的一種指紋辨識裝置的示意圖。 圖2是依照本發明另一實施例的一種指紋辨識裝置的示意圖。 圖3是依照本發明實施例的一種切換控制信號的示意圖。 圖4是依照本發明另一實施例的一種指紋辨識裝置的示意圖。 圖5是依照本發明另一實施例的切換控制信號的示意圖。 圖6是依照本發明另一實施例的一種指紋辨識裝置的示意圖。 圖7是依照本發明實施例的一種指紋辨識裝置的指紋辨識方法的流程圖。 圖8是依照本發明另一實施例的指紋辨識裝置的指紋辨識方法的流程圖。Fig. 1 is a schematic diagram of a fingerprint recognition device according to an embodiment of the present invention. Fig. 2 is a schematic diagram of a fingerprint recognition device according to another embodiment of the present invention. Fig. 3 is a schematic diagram of a switching control signal according to an embodiment of the present invention. Fig. 4 is a schematic diagram of a fingerprint recognition device according to another embodiment of the present invention. Fig. 5 is a schematic diagram of a switching control signal according to another embodiment of the present invention. Fig. 6 is a schematic diagram of a fingerprint recognition device according to another embodiment of the present invention. Fig. 7 is a flowchart of a fingerprint recognition method of a fingerprint recognition device according to an embodiment of the present invention. FIG. 8 is a flowchart of a fingerprint recognition method of a fingerprint recognition device according to another embodiment of the present invention.

102:蓋板102: cover

104、106:電極層104, 106: electrode layer

108:控制電路108: control circuit

202:發射控制電路202: emission control circuit

204:接收控制電路204: receiving control circuit

206:電容感測控制電路206: Capacitance sensing control circuit

208:切換電路208: switching circuit

210:處理電路210: processing circuit

F1:手指F1: Finger

S1~S3:切換控制信號S1~S3: switch control signal

SU1:感測單元SU1: Sensing unit

Claims (16)

一種指紋辨識裝置，包括：一感測單元，包括：一第一電極層；以及一第二電極層；以及一控制電路，耦接該第一電極層以及該第二電極層，該控制電路於一發射期間提供一致動電壓至該感測單元，而使該感測單元發射一超音波信號至一手指而產生一反射超音波信號，該第一電極層於一接收期間接收該反射超音波信號而對應產生一超音波感測信號，該第一電極層於一電容感測期間反應該第一電極層與該手指間的電容值變化而產生一電容感測信號，該控制電路自對應該超音波感測信號的一第一指紋影像與對應該電容感測信號的一第二指紋影像中選擇其一進行指紋辨識處理。 A fingerprint recognition device includes: a sensing unit, including: a first electrode layer; and a second electrode layer; and a control circuit coupled to the first electrode layer and the second electrode layer, the control circuit being During a transmitting period, an actuation voltage is provided to the sensing unit, so that the sensing unit transmits an ultrasonic signal to a finger to generate a reflected ultrasonic signal, and the first electrode layer receives the reflected ultrasonic signal during a receiving period Correspondingly, an ultrasonic sensing signal is generated. The first electrode layer generates a capacitance sensing signal in response to the capacitance change between the first electrode layer and the finger during a capacitance sensing period. The control circuit corresponds to the ultrasonic sensing signal. One of a first fingerprint image of the acoustic wave sensing signal and a second fingerprint image corresponding to the capacitive sensing signal is selected for fingerprint recognition processing. 如請求項1所述的指紋辨識裝置，其中該控制電路於該發射期間提供該致動電壓至該第一電極層或該第二電極層，而使該感測單元發射該超音波信號。 The fingerprint recognition device according to claim 1, wherein the control circuit provides the actuation voltage to the first electrode layer or the second electrode layer during the emission period, so that the sensing unit emits the ultrasonic signal. 如請求項2所述的指紋辨識裝置，其中該控制電路包括：一切換電路，耦接該第一電極層與該第二電極層；以及一發射控制電路，耦接該切換電路，該切換電路於該發射期間將該第一電極層或該第二電極層耦接至該發射控制電路，該發射控制電路於該發射期間提供該致動電壓； 一接收控制電路，耦接該切換電路，該切換電路於該接收期間將該第一電極層耦接至該接收控制電路，該接收控制電路於該接收期間接收該超音波感測信號；一電容感測控制電路，耦接該切換電路，該切換電路於該電容感測期間將該第一電極層耦接至該電容感測控制電路，該電容感測控制電路於該電容感測期間接收該電容感測信號；以及一處理電路，耦接該接收控制電路與該電容感測控制電路，分別自該接收控制電路與該電容感測控制電路接收對應該超音波感測信號的該第一指紋影像與對應該電容感測信號的該第二指紋影像，自該第一指紋影像與該第二指紋影像中選擇其一進行指紋辨識處理。 The fingerprint identification device according to claim 2, wherein the control circuit includes: a switching circuit coupled to the first electrode layer and the second electrode layer; and an emission control circuit coupled to the switching circuit, the switching circuit Coupling the first electrode layer or the second electrode layer to the emission control circuit during the emission period, and the emission control circuit provides the actuation voltage during the emission period; A receiving control circuit coupled to the switching circuit, the switching circuit coupling the first electrode layer to the receiving control circuit during the receiving period, the receiving control circuit receiving the ultrasonic sensing signal during the receiving period; a capacitor A sensing control circuit is coupled to the switching circuit, the switching circuit couples the first electrode layer to the capacitance sensing control circuit during the capacitance sensing period, and the capacitance sensing control circuit receives the capacitance sensing control circuit during the capacitance sensing period A capacitance sensing signal; and a processing circuit coupled to the receiving control circuit and the capacitance sensing control circuit, and receiving the first fingerprint corresponding to the ultrasonic sensing signal from the receiving control circuit and the capacitance sensing control circuit, respectively The image and the second fingerprint image corresponding to the capacitive sensing signal are selected from the first fingerprint image and the second fingerprint image for fingerprint recognition processing. 如請求項2所述的指紋辨識裝置，其中該第一電極層與該第二電極層間具有一空腔，該第一電極層與該第二電極層反應該致動電壓振動，而使該感測單元發射一超音波信號，該第一電極層於該接收期間接收該反射超音波信號，並反應該第一電極層與該第二電極層間的電容值變化將該反射超音波信號轉換為電信號，而產生該超音波感測信號。 The fingerprint recognition device according to claim 2, wherein a cavity is formed between the first electrode layer and the second electrode layer, and the first electrode layer and the second electrode layer react to the actuation voltage vibration to cause the sensing The unit transmits an ultrasonic signal, the first electrode layer receives the reflected ultrasonic signal during the receiving period, and reflects the change in capacitance between the first electrode layer and the second electrode layer, and converts the reflected ultrasonic signal into an electrical signal , And generate the ultrasonic sensing signal. 如請求項1所述的指紋辨識裝置，該指紋感測單元還包括：一第三電極層，耦接該控制電路，該控制電路於該發射期間提供該致動電壓至該第二電極層或該第三電極層，以使該第二電極層與該第三電極層反應該致動電壓振動，發射該超音波信號至 該手指而產生該反射超音波信號；以及一第四電極層，該第一電極層於該接收期間接收該反射超音波信號，並反應該第一電極層與該第四電極層間的電容值變化將該反射超音波信號轉換為電信號，產生該超音波感測信號。 According to the fingerprint recognition device of claim 1, the fingerprint sensing unit further includes: a third electrode layer coupled to the control circuit, and the control circuit provides the actuation voltage to the second electrode layer or The third electrode layer, so that the second electrode layer and the third electrode layer respond to the actuation voltage vibration, and transmit the ultrasonic signal to The finger generates the reflected ultrasonic signal; and a fourth electrode layer. The first electrode layer receives the reflected ultrasonic signal during the receiving period and reflects the change in capacitance between the first electrode layer and the fourth electrode layer The reflected ultrasonic signal is converted into an electrical signal to generate the ultrasonic sensing signal. 如請求項5所述的指紋辨識裝置，其中該發射期間部份重疊於該接收期間。 The fingerprint identification device according to claim 5, wherein the transmitting period partially overlaps the receiving period. 如請求項5所述的指紋辨識裝置，其中該第二電極層與該第三電極層間具有一第一空腔，該第一電極層與該第四電極層間具有一第二空腔。 The fingerprint recognition device according to claim 5, wherein a first cavity is formed between the second electrode layer and the third electrode layer, and a second cavity is formed between the first electrode layer and the fourth electrode layer. 如請求項1所述的指紋辨識裝置，其中該控制電路依據該第一指紋影像與該第二指紋影像的訊雜比以及對比度至少其中之一自該第一指紋影像與該第二指紋影像中選擇其一進行指紋辨識處理。 The fingerprint recognition device according to claim 1, wherein the control circuit selects at least one of the first fingerprint image and the second fingerprint image according to the signal-to-noise ratio and the contrast of the first fingerprint image and the second fingerprint image Choose one for fingerprint recognition processing. 如請求項1所述的指紋辨識裝置，其中該第二電極層配置於電子裝置的一蓋板與該第一電極層之間，該蓋板接收該手指的指紋辨識操作。 The fingerprint recognition device according to claim 1, wherein the second electrode layer is disposed between a cover plate of the electronic device and the first electrode layer, and the cover plate receives the fingerprint recognition operation of the finger. 一種指紋辨識裝置的指紋辨識方法，該指紋辨識裝置包括一感測單元，該感測單元包括一第一電極層以及一第二電極層，該指紋辨識裝置的指紋辨識方法包括：於一發射期間提供一致動電壓至該感測單元，而使該感測單元發射一超音波信號至一手指而產生一反射超音波信號；於一接收期間接收該第一電極層反應該反射超音波信號所 產生的一超音波感測信號；於一電容感測期間接收該第一電極層反應該第一電極層與該手指間的電容值變化所產生的一電容感測信號；以及自對應該超音波感測信號的一第一指紋影像與對應該電容感測信號的一第二指紋影像中選擇其一進行指紋辨識處理。 A fingerprint recognition method of a fingerprint recognition device. The fingerprint recognition device includes a sensing unit. The sensing unit includes a first electrode layer and a second electrode layer. The fingerprint recognition method of the fingerprint recognition device includes: during a transmission period Provide an actuation voltage to the sensing unit, so that the sensing unit emits an ultrasonic signal to a finger to generate a reflected ultrasonic signal; during a receiving period, the first electrode layer is received to reflect the reflected ultrasonic signal. Generating an ultrasonic sensing signal; receiving a capacitance sensing signal generated by the first electrode layer in response to the capacitance change between the first electrode layer and the finger during a capacitance sensing period; and self-corresponding ultrasonic waves One of a first fingerprint image of the sensing signal and a second fingerprint image corresponding to the capacitive sensing signal is selected for fingerprint recognition processing. 如請求項10所述的指紋辨識裝置的指紋辨識方法包括，於該發射期間提供該致動電壓至該第一電極層或該第二電極層，而使該感測單元發射該超音波信號。 The fingerprint recognition method of the fingerprint recognition device according to claim 10 includes providing the actuation voltage to the first electrode layer or the second electrode layer during the transmission period, so that the sensing unit transmits the ultrasonic signal. 如請求項11所述的指紋辨識裝置的指紋辨識方法，其中該第一電極層與該第二電極層間具有一空腔，該第一電極層與該第二電極層反應該致動電壓振動，而使該感測單元發射該超音波信號，該指紋辨識裝置的指紋辨識方法包括：於該接收期間，接收該第一電極層反應該第一電極層與該第二電極層間的電容值變化而產生的該超音波感測信號。 The fingerprint recognition method of the fingerprint recognition device according to claim 11, wherein a cavity is formed between the first electrode layer and the second electrode layer, the first electrode layer and the second electrode layer react to the actuation voltage vibration, and The sensing unit is made to emit the ultrasonic signal, and the fingerprint recognition method of the fingerprint recognition device includes: during the receiving period, receiving the first electrode layer reacts to the change of the capacitance between the first electrode layer and the second electrode layer. The ultrasonic sensing signal. 如請求項10所述的指紋辨識裝置的指紋辨識方法，其中該指紋辨識裝置還包括一第三電極層以及一第四電極層，該指紋辨識裝置的指紋辨識方法包括：於該發射期間，提供該致動電壓至該第二電極層或該第三電極層，以使該第二電極層與該第三電極反應該致動電壓發射該超音波信號至該手指而產生該反射超音波信號；以及於該接收期間，接收該第一電極層反應該第一電極層與該第四電極層間的電容值變化而產生的該超音波感測信號。 The fingerprint recognition method of a fingerprint recognition device according to claim 10, wherein the fingerprint recognition device further includes a third electrode layer and a fourth electrode layer, and the fingerprint recognition method of the fingerprint recognition device includes: The actuation voltage is applied to the second electrode layer or the third electrode layer, so that the second electrode layer and the third electrode react with the actuation voltage to transmit the ultrasonic signal to the finger to generate the reflected ultrasonic signal; And during the receiving period, receiving the ultrasonic sensing signal generated by the first electrode layer in response to the capacitance change between the first electrode layer and the fourth electrode layer. 如請求項13所述的指紋辨識裝置的指紋辨識方法，其中該發射期間部份重疊於該接收期間。 The fingerprint recognition method of the fingerprint recognition device according to claim 13, wherein the transmitting period partially overlaps the receiving period. 如請求項14所述的指紋辨識裝置的指紋辨識方法，其中該第二電極層與該第三電極層間具有一第一空腔，該第一電極層與該第四電極層間具有一第二空腔。 The fingerprint recognition method of the fingerprint recognition device according to claim 14, wherein a first cavity is formed between the second electrode layer and the third electrode layer, and a second cavity is formed between the first electrode layer and the fourth electrode layer. Cavity. 如請求項10所述的指紋辨識裝置的指紋辨識方法，包括：依據該第一指紋影像與該第二指紋影像的訊雜比以及對比度至少其中之一自該第一指紋影像與該第二指紋影像中選擇其一進行指紋辨識處理。 The fingerprint recognition method of the fingerprint recognition device according to claim 10, comprising: at least one of the signal-to-noise ratio and the contrast between the first fingerprint image and the second fingerprint image is selected from the first fingerprint image and the second fingerprint Choose one of the images for fingerprint recognition processing.
TW109126649A 2019-11-12 2020-08-06 Fingerprint identification apparatus and fingerprint identification method thereof TWI734577B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201962933983P 2019-11-12 2019-11-12
US62/933,983 2019-11-12

Publications (2)

Publication Number Publication Date
TW202119267A TW202119267A (en) 2021-05-16
TWI734577B true TWI734577B (en) 2021-07-21

Family

ID=72546916

Family Applications (2)

Application Number Title Priority Date Filing Date
TW109210157U TWM609288U (en) 2019-11-12 2020-08-06 Fingerprint identification apparatus
TW109126649A TWI734577B (en) 2019-11-12 2020-08-06 Fingerprint identification apparatus and fingerprint identification method thereof

Family Applications Before (1)

Application Number Title Priority Date Filing Date
TW109210157U TWM609288U (en) 2019-11-12 2020-08-06 Fingerprint identification apparatus

Country Status (3)

Country Link
CN (2) CN212569816U (en)
TW (2) TWM609288U (en)
WO (1) WO2021093384A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11934617B1 (en) 2022-11-10 2024-03-19 Infineon Technologies Ag Ultrasonic touch sensor using capacitive cross-talk

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI581152B (en) * 2016-01-20 2017-05-01 Intelligent touch touch device
TW201732518A (en) * 2016-03-14 2017-09-16 指紋卡公司 Capacitive fingerprint sensing device and method for capturing a fingerprint using the sensing device
TW201740262A (en) * 2016-05-02 2017-11-16 指紋卡公司 Capacitive fingerprint sensing device and method for capturing a fingerprint using the sensing device
TW201802723A (en) * 2016-06-16 2018-01-16 高通公司 Fingerprint sensor device and methods thereof
TW201828154A (en) * 2017-01-12 2018-08-01 美商高通公司 Dual-mode capacitive and ultrasonic fingerprint and touch sensor
CN109791582A (en) * 2016-10-12 2019-05-21 高通股份有限公司 Hybrid capacitance sensing and ultrasonic wave sensing

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016115363A1 (en) * 2015-01-16 2016-07-21 The Regents Of The University Of California Piezoelectric transducers and methods of making and using the same
CN107609484B (en) * 2017-08-15 2020-09-08 成都大超科技有限公司 Fingerprint identification module and electronic equipment that area position was listened
CN207097007U (en) * 2017-08-15 2018-03-13 吴露 Composite fingerprint identifies module and electronic equipment
CN207517029U (en) * 2017-08-15 2018-06-19 吴露 Composite fingerprint identifies module and electronic equipment
CN107657212A (en) * 2017-08-15 2018-02-02 吴露 Composite fingerprint identifies module and electronic equipment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI581152B (en) * 2016-01-20 2017-05-01 Intelligent touch touch device
TW201732518A (en) * 2016-03-14 2017-09-16 指紋卡公司 Capacitive fingerprint sensing device and method for capturing a fingerprint using the sensing device
TW201740262A (en) * 2016-05-02 2017-11-16 指紋卡公司 Capacitive fingerprint sensing device and method for capturing a fingerprint using the sensing device
TW201802723A (en) * 2016-06-16 2018-01-16 高通公司 Fingerprint sensor device and methods thereof
CN109791582A (en) * 2016-10-12 2019-05-21 高通股份有限公司 Hybrid capacitance sensing and ultrasonic wave sensing
TW201828154A (en) * 2017-01-12 2018-08-01 美商高通公司 Dual-mode capacitive and ultrasonic fingerprint and touch sensor

Also Published As

Publication number Publication date
CN111709405A (en) 2020-09-25
TWM609288U (en) 2021-03-21
TW202119267A (en) 2021-05-16
CN212569816U (en) 2021-02-19
WO2021093384A1 (en) 2021-05-20

Similar Documents

Publication Publication Date Title
US10871859B2 (en) Touch control device, electronic apparatus and control method of electronic apparatus
TW202102846A (en) Dual-frequency ultrasonic sensor system with frequency splitter
US10001552B2 (en) Three-port piezoelectric ultrasonic transducer
US10007343B2 (en) Force sensor in an input device
KR102316515B1 (en) Ultrasonic imaging with acoustic resonant cavity
CN109492623B (en) Ultrasonic fingerprint identification module and display panel
TWI639939B (en) Sonic touch device and electronic device having same
CN106895863A (en) Ultrasonic sensor and the electronic installation using the ultrasonic sensor
TWI734577B (en) Fingerprint identification apparatus and fingerprint identification method thereof
CN108268156A (en) Touch screen and electronic device with fingerprint identification function
KR102564899B1 (en) Fingerprint sensing module, fingerprint sensing apparatus including the module, and display apparatus including the apparatus
CN113165017B (en) Ultrasonic transducer, information acquisition element and electronic equipment
CN108268816A (en) Touch screen and electronic device with fingerprint identification function
TW202107452A (en) Passive acoustic fingerprint sensor
TWM616810U (en) Fingerprint sensing apparatus
Horsley Wave hello to the next interface
TWI637596B (en) Touch sensitve switch and electronic device
CN112711150B (en) Display device
CN218525127U (en) Ultrasonic fingerprint identification module and device
AU2018102095B4 (en) Input device with force sensor
US20240126394A1 (en) Piezoelectric transducers for detection of touch on a surface
TW202309783A (en) Under-display ultrasonic fingerprint sensors for foldable displays
KR20200053195A (en) Apparatus for sensing touching
KR20230159423A (en) Segmented transducers for acoustic applications
CN116723794A (en) Temperature measurement via ultrasonic sensor

Legal Events

Date Code Title Description
MM4A Annulment or lapse of patent due to non-payment of fees