TWM609288U - Fingerprint identification apparatus - Google Patents
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- TWM609288U TWM609288U TW109210157U TW109210157U TWM609288U TW M609288 U TWM609288 U TW M609288U TW 109210157 U TW109210157 U TW 109210157U TW 109210157 U TW109210157 U TW 109210157U TW M609288 U TWM609288 U TW M609288U
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- 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
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Abstract
Description
本新型創作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。 The new creation is related to a recognition device, and particularly to a fingerprint recognition device.
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, common fingerprint recognition devices can be divided into optical, capacitive, ultrasonic, etc., among 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.
本新型創作提供一種指紋辨識裝置,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。 This new creation provides a fingerprint identification device, which can respond to fingerprint identification equipment According to the environmental conditions, the clearest fingerprint image can be obtained for fingerprint recognition, and the use quality of the fingerprint recognition device can be improved.
本新型創作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 identification device created by 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.
基于上述,本新型創作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 creative 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 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 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.
102:蓋板 102: cover
104、106、402~408:電極層 104, 106, 402~408: 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
T1:發射期間 T1: during launch
T2:接收期間 T2: during reception
T3:電容感測期間 T3: During capacitance sensing
H1:空腔 H1: Cavity
S702~S708、S802~S808:指紋辨識裝置的指紋辨識方法的步驟 S702~S708, S802~S808: Steps of fingerprint identification method of fingerprint identification device
圖1是依照本新型創作實施例的一種指紋辨識裝置的示意圖。 Fig. 1 is a schematic diagram of a fingerprint recognition device according to an embodiment of the present invention.
圖2是依照本新型創作另一實施例的一種指紋辨識裝置的示意圖。 Fig. 2 is a schematic diagram of a fingerprint recognition device according to another embodiment of the present invention.
圖3是依照本新型創作實施例的一種切換控制信號的示意圖。 Fig. 3 is a schematic diagram of a switching control signal according to an embodiment of the present invention.
圖4是依照本新型創作另一實施例的一種指紋辨識裝置的示意圖。 Fig. 4 is a schematic diagram of a fingerprint recognition device according to another embodiment of the present invention.
圖5是依照本新型創作另一實施例的切換控制信號的示意圖。 Fig. 5 is a schematic diagram of a switching control signal according to another embodiment of the new creation.
圖6是依照本新型創作另一實施例的一種指紋辨識裝置的示意圖。 Fig. 6 is a schematic diagram of a fingerprint recognition device according to another embodiment of the present invention.
圖7是依照本新型創作實施例的一種指紋辨識裝置的指紋辨識方法的流程圖。 Fig. 7 is a flowchart of a fingerprint recognition method of a fingerprint recognition device according to an embodiment of the invention.
圖8是依照本新型創作另一實施例的指紋辨識裝置的指紋辨識方法的流程圖。 Fig. 8 is a flowchart of a fingerprint recognition method of a fingerprint recognition device according to another embodiment of the present invention.
圖1是依照本新型創作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 invention. Please refer to FIG. 1. The fingerprint recognition device may include an
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
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
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 the water, the detection surface provided by the
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
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
圖2是依照本新型創作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
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
圖4是依照本新型創作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
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
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
圖6是依照本新型創作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 can be as shown in FIG. 6, a cavity H1 is formed between the
圖7是依照本新型創作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 identification method of the fingerprint identification 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. Two electrode layers, the first electrode layer and the second electrode layer can respond to actuation 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 voids between the first electrode layer and the second electrode layer. In the cavity, the first electrode layer and the second electrode layer can receive the reflected ultrasonic signal and generate vibrations, which can change the capacitance between the first electrode layer and the second electrode layer. The first electrode layer can reflect the first electrode layer and the second electrode layer. The change of the capacitance value between the electrode layers converts the reflected ultrasonic signal into an electrical signal, thereby generating an ultrasonic sensing signal. 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 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 recognition processing.
圖8是依照本新型創作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層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 actuation 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, 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. 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, The second electrode layer and the third electrode layer react with the actuation voltage to transmit 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 recognition device.
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
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