TW201824069A - Biological feature identification device - Google Patents
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- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
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Abstract
Description
本發明是有關於一種生物特徵辨識裝置。The invention relates to a biometric identification device.
生物特徵辨識的種類包括臉部、聲音、虹膜、視網膜、靜脈、指紋和掌紋辨識等。由於每個人的指紋都是獨一無二的，且指紋不易隨著年齡或身體健康狀況而變化，因此指紋辨識裝置已成為目前最普及的一種生物特徵辨識裝置。依照感測方式的不同，指紋辨識裝置可分為光學式與電容式。電容式指紋辨識裝置組裝於電子產品（例如：手機、平板電腦）時，電容式指紋辨識裝置上方多設有保護元件（cover lens）。一般而言，需額外加工（例如鑽孔或薄化）保護元件，以使電容式指紋辨識裝置能夠感測到手指觸碰所造成的容值或電場變化。The types of biometrics include face, sound, iris, retina, vein, fingerprint, and palmprint recognition. Since each person's fingerprint is unique and the fingerprint is not easy to change with age or physical health, the fingerprint identification device has become the most popular biometric identification device. According to the different sensing methods, the fingerprint identification device can be divided into optical and capacitive. When the capacitive fingerprint identification device is assembled in an electronic product (for example, a mobile phone or a tablet computer), a cover lens is disposed above the capacitive fingerprint identification device. In general, additional processing (eg, drilling or thinning) of the protective element is required to enable the capacitive fingerprinting device to sense the change in capacitance or electric field caused by a finger touch.
相較於電容式指紋辨識裝置，光學式指紋辨識裝置擷取容易穿透保護元件的光進行指紋辨識，而可以不用額外加工保護元件，因此在與電子產品的結合上較為便利。Compared with the capacitive fingerprint identification device, the optical fingerprint identification device captures light that easily penetrates the protection component for fingerprint recognition, and can eliminate the need for additional processing of the protection component, thereby facilitating the combination with the electronic product.
光學式指紋辨識裝置通常包括光源、影像擷取元件及透光元件。光源用以發出光束，以照射按壓在透光元件上的手指。手指的指紋是由多條不規則的凸紋與凹紋所組成。被凸紋與凹紋反射的光束會在影像擷取元件的接收面上形成為明暗交錯的指紋影像。影像擷取元件可將指紋影像轉換為對應的影像資訊，並將影像資訊輸入至處理單元。處理單元可利用演算法計算對應於指紋的影像資訊，以進行使用者的身份辨識。然而，在上述的取像過程中，被指紋反射的光束易散亂地傳遞至影像擷取元件，而造成取像品質不佳，影響辨識結果。The optical fingerprint identification device generally includes a light source, an image capturing component, and a light transmitting component. The light source is used to emit a light beam to illuminate a finger pressed against the light transmissive element. Finger fingerprints are made up of a number of irregular ridges and indentations. The beams reflected by the ridges and the indentations form a fingerprint image that is interlaced on the receiving surface of the image capturing element. The image capture component converts the fingerprint image into corresponding image information and inputs the image information to the processing unit. The processing unit may use an algorithm to calculate image information corresponding to the fingerprint for identification of the user. However, in the above image capturing process, the light beam reflected by the fingerprint is easily transmitted to the image capturing component, which results in poor image quality and affects the recognition result.
本發明提供一種生物特徵辨識裝置。The invention provides a biometric identification device.
本發明的生物特徵辨識裝置包括光源、導光元件、影像擷取元件以及第一準直器。光源適於提供光束。導光元件位於光束的傳遞路徑上。影像擷取元件位於導光元件下方且具有多個像素區。第一準直器位於導光元件與影像擷取元件之間，其中第一準直器包括第一透光元件、第二透光元件、第一吸光層、第二吸光層以及第三吸光層。第二透光元件位於第一透光元件與影像擷取元件之間。第一吸光層配置在第一透光元件上且具有多個第一開口。第二吸光層位於第一透光元件與第二透光元件之間且具有多個第二開口。第三吸光層配置在第二透光元件面向影像擷取元件的表面上且具有多個第三開口。第一開口、第二開口與第三開口重疊於像素區。The biometric identification device of the present invention includes a light source, a light guiding element, an image capturing element, and a first collimator. The light source is adapted to provide a light beam. The light guiding element is located on the transmission path of the light beam. The image capturing component is located below the light guiding component and has a plurality of pixel regions. The first collimator is located between the light guiding element and the image capturing element, wherein the first collimator comprises a first light transmitting element, a second light transmitting element, a first light absorbing layer, a second light absorbing layer and a third light absorbing layer . The second light transmissive element is located between the first light transmissive element and the image capturing element. The first light absorbing layer is disposed on the first light transmissive element and has a plurality of first openings. The second light absorbing layer is located between the first light transmissive element and the second light transmissive element and has a plurality of second openings. The third light absorbing layer is disposed on the surface of the second light transmitting element facing the image capturing element and has a plurality of third openings. The first opening, the second opening and the third opening overlap the pixel area.
在本發明的一實施例中，上述的導光元件具有出光部以及連接於出光部的入光部。光源與影像擷取元件共同位於出光部下方。入光部位於光源與出光部之間。In an embodiment of the invention, the light guiding element has a light exiting portion and a light incident portion connected to the light exiting portion. The light source and the image capturing component are located below the light exiting portion. The light incident portion is located between the light source and the light exit portion.
在本發明的一實施例中，上述的光源位於導光元件的側面。In an embodiment of the invention, the light source is located on a side of the light guiding element.
在本發明的一實施例中，上述的導光元件面向第一準直器的表面形成有多個微結構。微結構凸出或凹入於表面。In an embodiment of the invention, the light guiding element has a plurality of microstructures formed on a surface of the first collimator. The microstructure is convex or concave on the surface.
在本發明的一實施例中，上述的第一透光元件以及第二透光元件的折射率分別落在1.3至1.7的範圍內。In an embodiment of the invention, the refractive indices of the first light transmissive element and the second light transmissive element fall within a range of 1.3 to 1.7, respectively.
在本發明的一實施例中，上述的各第一開口的孔徑與第一透光元件的高度比落在2至20的範圍內。各第二開口的孔徑與第一透光元件的高度比落在2至20的範圍內。各第三開口的孔徑與第二透光元件的高度比落在2至20的範圍內。In an embodiment of the invention, the height ratio of the aperture of each of the first openings to the first light transmissive element falls within a range of 2 to 20. The ratio of the aperture of each of the second openings to the height of the first light transmissive element falls within the range of 2 to 20. The ratio of the aperture of each of the third openings to the height of the second light transmissive element falls within the range of 2 to 20.
在本發明的一實施例中，上述的第一開口的孔徑大於或等於第二開口的孔徑，且第二開口的孔徑大於或等於第三開口的孔徑。In an embodiment of the invention, the aperture of the first opening is greater than or equal to the aperture of the second opening, and the aperture of the second opening is greater than or equal to the aperture of the third opening.
在本發明的一實施例中，上述的第一吸光層或第二吸光層還配置在第一透光元件的側壁面上。In an embodiment of the invention, the first light absorbing layer or the second light absorbing layer is further disposed on a side wall surface of the first light transmitting element.
在本發明的一實施例中，上述的生物特徵辨識裝置還包括蓋板，其中導光元件位於蓋板與第一準直器之間。In an embodiment of the invention, the biometric device further includes a cover plate, wherein the light guiding element is located between the cover plate and the first collimator.
在本發明的一實施例中，上述的生物特徵辨識裝置還包括第二準直器。第二準直器位於導光元件與第一準直器之間。In an embodiment of the invention, the biometric device further includes a second collimator. The second collimator is located between the light guiding element and the first collimator.
在本發明的一實施例中，上述的第二準直器包括多個稜鏡。稜鏡的頂角指向導光元件。In an embodiment of the invention, the second collimator includes a plurality of turns. The top corner of the cymbal refers to the light guide element.
基於上述，在本發明的實施例的生物特徵辨識裝置中，通過調變第一開口、第二開口與第三開口的孔徑來吸收經待辨識物作用且通過導光元件的大角度光束，以將傳遞至影像擷取元件的光束準直化，使影像擷取元件的取像品質提升。因此，生物特徵辨識裝置可具有良好的辨識能力。Based on the above, in the biometric device of the embodiment of the present invention, by modulating the apertures of the first opening, the second opening, and the third opening to absorb the large-angle light beam that acts through the light-guiding element and passes through the light guiding element, The beam transmitted to the image capturing component is collimated to improve the image quality of the image capturing component. Therefore, the biometric device can have good recognition capabilities.
為讓本發明的上述特徵和優點能更明顯易懂，下文特舉實施例，並配合所附圖式作詳細說明如下。The above described features and advantages of the invention will be apparent from the following description.
現將詳細地參考本發明的示範性實施例，示範性實施例的實例說明於附圖中。只要有可能，相同元件符號在圖式和描述中用來表示相同或相似部分。Reference will now be made in detail to the exemplary embodiments embodiments Wherever possible, the same element symbols are used in the drawings and the description
圖1為本發明一實施例的生物特徵辨識裝置的剖面示意圖。請參照圖1，生物特徵辨識裝置100例如為指紋辨識裝置，用以辨識待辨識物10的指紋，但不以此為限。在另一實施例中，生物特徵辨識裝置100也可用以辨識靜脈、掌紋或是指紋、靜脈以及掌紋的其中至少兩個的組合。1 is a schematic cross-sectional view of a biometric device according to an embodiment of the present invention. Referring to FIG. 1 , the biometric device 100 is, for example, a fingerprint identification device for identifying the fingerprint of the object 10 to be identified, but is not limited thereto. In another embodiment, the biometric device 100 can also be used to identify a combination of at least two of a vein, a palm print, or a fingerprint, a vein, and a palm print.
生物特徵辨識裝置100包括光源110、導光元件120、影像擷取元件130以及第一準直器140。The biometric device 100 includes a light source 110, a light guiding element 120, an image capturing element 130, and a first collimator 140.
光源110適於提供光束B。光源110可以是非可見光光源或可見光光源。也就是說，光束B可以是不可見光（例如：紅外光）或可見光（例如：紅光、藍光、綠光或其組合）。或者，光源110可以是非可見光光源與可見光光源的組合。舉例而言，光源110可包括多個發光元件112。發光元件112可為發光二極體或其他適當種類的發光元件。圖1示意地顯示出兩個發光元件112，且兩個發光元件112位在影像擷取元件130的相對側。然而，發光元件112的數量以及配置方式可依需求改變，而不以此為限。Light source 110 is adapted to provide beam B. Light source 110 can be a non-visible light source or a visible light source. That is, the light beam B may be invisible light (eg, infrared light) or visible light (eg, red light, blue light, green light, or a combination thereof). Alternatively, light source 110 can be a combination of a non-visible light source and a visible light source. For example, light source 110 can include a plurality of light emitting elements 112. Light-emitting element 112 can be a light-emitting diode or other suitable type of light-emitting element. FIG. 1 schematically shows two light-emitting elements 112 with two light-emitting elements 112 on opposite sides of the image capture element 130. However, the number and arrangement of the light-emitting elements 112 can be changed as needed, and not limited thereto.
導光元件120位於光束B的傳遞路徑上，其適於將光源110提供的光束B導向待辨識物10。舉例而言，導光元件110的材質可為玻璃、聚碳酸酯（PC）、聚甲基丙烯酸甲酯（PMMA）或其他適當材料。在本實施例中，光源110與影像擷取元件130位於導光元件120的同一側。生物特徵辨識裝置100進一步包括電路板150。光源110配置在電路板150上且與電路板150電連接。導光元件120具有出光部122以及連接於出光部122的至少一入光部124。光源110與影像擷取元件130共同位於出光部122下方，且光源110位於影像擷取元件130旁。入光部124位於光源110與出光部122之間。詳細而言，入光部124可固定在電路板150上，且入光部124具有凹陷C。凹陷C與電路板150圍出容納光源110的空間。在另一實施例中，入光部124與電路板150的其中至少一個可具有凹陷（未繪示），以容納光源110。在又一實施例中，入光部124與電路板150可藉由固定機構（未繪示）或黏著層（未繪示，例如：光學膠）固定在一起。在再一實施例中，入光部124可藉由黏著層（未繪示，例如：光學膠）而固定在光源110上，且入光部124可不與電路板150接觸。圖1示意地顯示出兩個入光部124，且兩個入光部124位在出光部122的相對側。然而，入光部124的數量以及配置方式可依需求改變，而不以此為限。The light guiding element 120 is located on the transmission path of the light beam B, and is adapted to direct the light beam B provided by the light source 110 to the object to be recognized 10. For example, the material of the light guiding element 110 may be glass, polycarbonate (PC), polymethyl methacrylate (PMMA) or other suitable materials. In this embodiment, the light source 110 and the image capturing component 130 are located on the same side of the light guiding component 120. The biometric device 100 further includes a circuit board 150. The light source 110 is disposed on the circuit board 150 and is electrically connected to the circuit board 150. The light guiding element 120 has a light exiting portion 122 and at least one light incident portion 124 connected to the light exiting portion 122. The light source 110 and the image capturing component 130 are located below the light exiting portion 122 , and the light source 110 is located beside the image capturing component 130 . The light incident portion 124 is located between the light source 110 and the light exit portion 122. In detail, the light incident portion 124 may be fixed to the circuit board 150, and the light incident portion 124 has a recess C. The recess C and the circuit board 150 enclose a space in which the light source 110 is housed. In another embodiment, at least one of the light incident portion 124 and the circuit board 150 may have a recess (not shown) to accommodate the light source 110. In another embodiment, the light incident portion 124 and the circuit board 150 may be fixed together by a fixing mechanism (not shown) or an adhesive layer (not shown, for example, an optical glue). In another embodiment, the light incident portion 124 can be fixed on the light source 110 by an adhesive layer (not shown, for example, an optical glue), and the light incident portion 124 can not be in contact with the circuit board 150. FIG. 1 schematically shows two light incident portions 124, and the two light incident portions 124 are located on opposite sides of the light exit portion 122. However, the number and arrangement of the light incident portions 124 can be changed as needed, and is not limited thereto.
圖2為圖1中導光元件的一種放大圖。請參照圖1及圖2，光源110射出的光束B自入光部124進入導光元件120，且光束B可經由入光部124傳遞至出光部122。導光元件120面向第一準直器140的表面S可選擇性地形成有多個微結構M（圖1未繪示，請參照圖2）。微結構M適於改變光束B的傳遞方向，使得被微結構M反射的光束B垂直或接近垂地直射出出光部122。如圖2所示，微結構M可凸出於表面S且可具有第一反射面S1以及第二反射面S2。第一反射面S1與第二反射面S2彼此相連，其中第一反射面S1與第二反射面S2相對於表面S傾斜，且第一反射面S1與第二反射面S2的傾斜方向相反。在一實施例中，微結構M、出光部122以及入光部124可一體成型，但不以此為限。在另一實施例中，微結構M、出光部122以及入光部124可分別製作，再藉由連接機構或黏著層（例如：光學膠）固定在一起。或者，微結構M也可凹入於表面S。具體地，微結構M可以是形成在表面S上的凹陷。另外，微結構M的數量及其分布可依據不同的需求改變，而不限於圖2所顯示的數量及分布。2 is an enlarged view of the light guiding element of FIG. 1. Referring to FIGS. 1 and 2 , the light beam B emitted from the light source 110 enters the light guiding element 120 from the light incident portion 124 , and the light beam B can be transmitted to the light exit portion 122 via the light incident portion 124 . The surface S of the light guiding element 120 facing the first collimator 140 can be selectively formed with a plurality of microstructures M (not shown in FIG. 1 , please refer to FIG. 2 ). The microstructure M is adapted to change the direction of transmission of the beam B such that the beam B reflected by the microstructure M is directed perpendicularly or nearly perpendicularly out of the exit portion 122. As shown in FIG. 2, the microstructure M may protrude from the surface S and may have a first reflective surface S1 and a second reflective surface S2. The first reflective surface S1 and the second reflective surface S2 are connected to each other, wherein the first reflective surface S1 and the second reflective surface S2 are inclined with respect to the surface S, and the oblique directions of the first reflective surface S1 and the second reflective surface S2 are opposite. In one embodiment, the microstructure M, the light exit portion 122, and the light incident portion 124 may be integrally formed, but not limited thereto. In another embodiment, the microstructures M, the light exiting portion 122, and the light incident portion 124 can be separately fabricated and fixed together by a connecting mechanism or an adhesive layer (for example, an optical adhesive). Alternatively, the microstructure M can also be recessed into the surface S. Specifically, the microstructure M may be a depression formed on the surface S. In addition, the number of microstructures M and their distribution may vary according to different needs, and are not limited to the number and distribution shown in FIG.
出光部122輸出光束B的表面S’與形成有微結構M的表面S相對。在一實施例中，表面S’可以是供待辨識物10按壓的按壓面。在表面S’為按壓面的架構下，如圖2所示，來自光源110的光束B依序通過入光部124以及出光部122，並在表面S’發生全內反射（Total Internal Reflection, TIR），接著依序被第二反射面S2以及第一反射面S1反射，並垂直或接近垂直地射出表面S’。The surface S' of the light-emitting portion 122 outputting the light beam B is opposed to the surface S on which the microstructure M is formed. In an embodiment, the surface S' may be a pressing surface for pressing the object to be recognized 10. Under the structure in which the surface S' is a pressing surface, as shown in FIG. 2, the light beam B from the light source 110 sequentially passes through the light incident portion 124 and the light exit portion 122, and total internal reflection (TIR) occurs on the surface S'. Then, it is sequentially reflected by the second reflecting surface S2 and the first reflecting surface S1, and the surface S' is emitted vertically or nearly vertically.
或者，如圖1所示，生物特徵辨識裝置100可進一步包括蓋板160以供待辨識物10按壓。蓋板160位於導光元件120上方，且導光元件120位於蓋板160與第一準直器140之間。蓋板160可以是所欲組裝的電子產品（例如：觸控面板或觸控顯示面板）的保護元件（cover lens），但不以此為限。在一實施例中，蓋板160與導光元件120可藉由連接機構或黏著層（例如：光學膠）而固定在一起，但不以此為限。以黏著層固定蓋板160與導光元件120的情況下，黏著層、蓋板160與導光元件120的折射率可相同或相近，以減少介面反射，進而提升生物特徵辨識裝置100的光利用效率及/或取像品質。然而，在其他實施例中，黏著層、蓋板160與導光元件120的折射率也可相異。在設置蓋板160的架構下，來自光源110的光束B依序通過入光部124出光部122以及蓋板160，並在蓋板160供待辨識物10按壓的表面發生全內反射。經待辨識物10作用（例如：漫射）的光束B’依序通過蓋板160以及出光部122並傳遞至表面S。傳遞至表面S的光束B’的一部分會被表面S反射，而再次朝蓋板160供待辨識物10按壓的表面傳遞。另一方面，傳遞至表面S的光束B’的另一部分會自表面S射出導光元件120。Alternatively, as shown in FIG. 1, the biometric device 100 may further include a cover plate 160 for the object 10 to be pressed. The cover plate 160 is located above the light guiding element 120, and the light guiding element 120 is located between the cover plate 160 and the first collimator 140. The cover plate 160 may be a cover lens of an electronic product (for example, a touch panel or a touch display panel) to be assembled, but is not limited thereto. In an embodiment, the cover plate 160 and the light guiding member 120 may be fixed together by a connecting mechanism or an adhesive layer (for example, an optical adhesive), but not limited thereto. In the case where the cover plate 160 and the light guiding element 120 are fixed by the adhesive layer, the refractive indices of the adhesive layer, the cover plate 160 and the light guiding element 120 may be the same or similar to reduce the interface reflection, thereby improving the light utilization of the biometric device 100. Efficiency and / or image quality. However, in other embodiments, the refractive indices of the adhesive layer, the cover plate 160, and the light guiding element 120 may also be different. Under the structure in which the cover plate 160 is disposed, the light beam B from the light source 110 sequentially passes through the light-emitting portion 122 and the cover plate 160 of the light-receiving portion 124, and total internal reflection occurs on the surface of the cover plate 160 where the object to be recognized 10 is pressed. The light beam B' acting (e.g., diffused) by the object 10 to be identified passes through the cover plate 160 and the light exit portion 122 in sequence and is transmitted to the surface S. A portion of the light beam B' transmitted to the surface S is reflected by the surface S, and is again transmitted toward the surface of the cover plate 160 where the object 10 is to be pressed. On the other hand, another portion of the light beam B' transmitted to the surface S will exit the light guiding element 120 from the surface S.
影像擷取元件130位於導光元件120下方且具有例如呈陣列排列的多個像素（pixel）區PR（顯示於圖4），以接收經待辨識物10作用的光束B’，進而取得待辨識物10的影像。在本實施例中，影像擷取元件130例如包括多個電荷耦合元件（Charge-Coupled Device, CCD）132（顯示於圖4）。電荷耦合元件132配置於電路板150上並與電路板150電連接。電荷耦合元件132的所在區域為影像擷取元件130的像素區PR。在另一實施例中，影像擷取元件130可包括多個互補金屬氧化物半導體（Complementary Metal Oxide Semiconductor, CMOS），且互補金屬氧化物半導體的所在區域為影像擷取元件130的像素區PR。The image capturing component 130 is located below the light guiding component 120 and has a plurality of pixel regions PR (shown in FIG. 4) arranged in an array to receive the light beam B′ acting through the object to be identified 10, thereby obtaining a to-be-identified image. Image of object 10. In the present embodiment, the image capturing component 130 includes, for example, a plurality of Charge-Coupled Devices (CCDs) 132 (shown in FIG. 4). The charge coupled device 132 is disposed on the circuit board 150 and electrically connected to the circuit board 150. The area where the charge coupled element 132 is located is the pixel area PR of the image capture element 130. In another embodiment, the image capturing component 130 can include a plurality of complementary metal oxide semiconductors (CMOSs), and the region of the complementary metal oxide semiconductor is the pixel region PR of the image capturing component 130.
第一準直器140位於導光元件120與影像擷取元件130之間，且第一準直器140位於待辨識物10作用後的光束B’的傳遞路徑上。舉例而言，第一準直器140可配置在影像擷取元件130上，且第一準直器140與影像擷取元件130可藉由連接機構或黏著層（例如：光學膠）而固定在一起，但不以此為限。The first collimator 140 is located between the light guiding element 120 and the image capturing element 130, and the first collimator 140 is located on the transmission path of the light beam B' after the object 10 is to be recognized. For example, the first collimator 140 can be disposed on the image capturing component 130, and the first collimator 140 and the image capturing component 130 can be fixed by a connecting mechanism or an adhesive layer (eg, an optical adhesive). Together, but not limited to this.
圖3為圖1中第一準直器的一種示意圖，顯示出第一準直器的正面及背面。圖4為圖1中第一準直器、影像擷取元件以及電路板的一種剖面示意圖。請參照圖1、圖3及圖4，第一準直器140包括第一透光元件141、第二透光元件142、第一吸光層143、第二吸光層144以及第三吸光層145。3 is a schematic view of the first collimator of FIG. 1 showing the front and back sides of the first collimator. 4 is a cross-sectional view of the first collimator, the image capturing component, and the circuit board of FIG. 1. Referring to FIG. 1 , FIG. 3 and FIG. 4 , the first collimator 140 includes a first light transmissive element 141 , a second light transmissive element 142 , a first light absorbing layer 143 , a second light absorbing layer 144 , and a third light absorbing layer 145 .
第二透光元件142位於第一透光元件141與影像擷取元件130之間。第一透光元件141以及第二透光元件142適於讓經待辨識物10作用且通過導光元件120的光束B’通過。舉例而言，第一透光元件141以及第二透光元件142的材質可為玻璃、聚碳酸酯（PC）、聚甲基丙烯酸甲酯（PMMA）或其他適當材料。The second light transmitting element 142 is located between the first light transmitting element 141 and the image capturing element 130. The first light transmitting element 141 and the second light transmitting element 142 are adapted to pass the light beam B' acting through the object to be recognized 10 and passing through the light guiding element 120. For example, the material of the first light transmissive element 141 and the second light transmissive element 142 may be glass, polycarbonate (PC), polymethyl methacrylate (PMMA) or other suitable materials.
第一吸光層143配置在第一透光元件141上且具有多個第一開口O1。第二吸光層144位於第一透光元件141與第二透光元件142之間且具有多個第二開口O2。第三吸光層145配置在第二透光元件142面向影像擷取元件130的表面S1421上且具有多個第三開口O3。第一開口O1、第二開口O2與第三開口O3重疊於像素區PR。The first light absorbing layer 143 is disposed on the first light transmitting element 141 and has a plurality of first openings O1. The second light absorbing layer 144 is located between the first light transmitting element 141 and the second light transmitting element 142 and has a plurality of second openings O2. The third light absorbing layer 145 is disposed on the surface S1421 of the second light transmitting element 142 facing the image capturing element 130 and has a plurality of third openings O3. The first opening O1, the second opening O2, and the third opening O3 overlap the pixel region PR.
在本實施例中，第一吸光層143與第二吸光層144分別配置在第一透光元件141的相對的表面S1411與表面S1412上，且第二透光元件142可藉由連接機構或黏著層（例如：光學膠）而固定於第一透光元件141形成有第二吸光層144的一側，但不以此為限。在另一實施例中，第二吸光層144可與第三吸光層145分別配置在第二透光元件142的相對的表面S1422與表面S1421上，且第一透光元件141可藉由連接機構或黏著層（例如：光學膠）而固定於第二透光元件142形成有第二吸光層144的一側。在又一實施例中，第二吸光層144可預先形成在第三透光元件（未顯示）上，且第三透光元件可藉由連接機構或黏著層而固定於第一透光元件141與第二透光元件142之間。In this embodiment, the first light absorbing layer 143 and the second light absorbing layer 144 are respectively disposed on the opposite surfaces S1411 and S1412 of the first light transmitting element 141, and the second light transmitting element 142 can be connected or adhered. The layer (for example, an optical glue) is fixed to one side of the first light-transmitting element 141 where the second light-absorbing layer 144 is formed, but is not limited thereto. In another embodiment, the second light absorbing layer 144 and the third light absorbing layer 145 are respectively disposed on the opposite surfaces S1422 and S1421 of the second light transmitting element 142, and the first light transmitting element 141 can be connected by the connecting mechanism. Or an adhesive layer (for example, an optical adhesive) is fixed to one side of the second light transmitting member 142 where the second light absorbing layer 144 is formed. In still another embodiment, the second light absorbing layer 144 may be pre-formed on the third light transmissive element (not shown), and the third light transmissive element may be fixed to the first light transmissive element 141 by a connecting mechanism or an adhesive layer. Between the second light transmissive element 142.
當導光元件120與第一準直器140之間的光傳遞介質（例如：空氣或光學膠）的折射率不同於第一透光元件141的折射率時，入射第一透光元件141的光束B’（包括大角度入射第一透光元件141的光束B1’與光束B2’以及小角度入射第一透光元件141的光束B3’）會在第一透光元件141的表面S1411經由折射而進入第一透光元件141。因此，第一透光元件141的設置有助於收斂光束B’進入第一準直器140的角度，進而讓更多的光束B’能夠傳遞至影像擷取元件130。When the refractive index of the light transmitting medium (for example, air or optical glue) between the light guiding element 120 and the first collimator 140 is different from the refractive index of the first light transmitting element 141, the first light transmitting element 141 is incident. The light beam B' (including the light beam B1' and the light beam B2' incident at a large angle to the first light transmitting element 141 and the light beam B3' incident at a small angle to the first light transmitting element 141) may be refracted on the surface S1411 of the first light transmitting element 141. And entering the first light transmitting element 141. Therefore, the arrangement of the first light transmissive elements 141 helps to converge the angle of the beam B' into the first collimator 140, thereby allowing more of the beam B' to be transmitted to the image capture element 130.
第一吸光層143、第二吸光層144以及第三吸光層145的材質例如可採用含有吸光材料（例如：碳）的矽膠系或壓克力系材料。如此一來，即使大角度入射第一透光元件141的光束B1’與光束B2’以及小角度入射第一透光元件141的光束B3’皆通過第一開口O1而進入第一透光元件141，仍可利用位於第一透光元件141與第二透光元件142之間的第二吸光層144吸收大角度入射第一透光元件141的光束（例如：光束B1’）。即使有部分大角度入射第一透光元件141的光束（例如：光束B2’）通過第二開口O2而進入第二透光元件142，仍可利用鄰近於影像擷取元件130的第三吸光層145吸收大角度入射第二透光元件142的光束（例如：光束B2’），而僅讓小角度入射第一準直器140的光束B3’通過並傳遞至影像擷取元件130。The material of the first light absorbing layer 143, the second light absorbing layer 144, and the third light absorbing layer 145 may be, for example, a silicone-based or acryl-based material containing a light absorbing material (for example, carbon). In this way, even if the light beam B1 ′ and the light beam B2 ′ incident at a large angle to the first light transmitting element 141 and the light beam B3 ′ entering the first light transmitting element 141 at a small angle pass through the first opening O1, the first light transmitting element 141 enters the first light transmitting element 141 . The second light absorbing layer 144 between the first light transmitting element 141 and the second light transmitting element 142 can still absorb the light beam (for example, the light beam B1') incident on the first light transmitting element 141 at a large angle. Even if a portion of the light beam (for example, the light beam B2') incident on the first light transmitting element 141 at a large angle enters the second light transmitting element 142 through the second opening O2, the third light absorbing layer adjacent to the image capturing element 130 can be utilized. 145 absorbs a light beam incident on the second light transmitting element 142 at a large angle (for example, the light beam B2'), and passes only the light beam B3' incident at a small angle to the first collimator 140 and transmits it to the image capturing element 130.
進入第一準直器140的光束是否被吸光層（包括第一吸光層143、第二吸光層144以及第三吸光層145）吸收可取決於第一開口O1的孔徑WO1、第二開口O2的孔徑WO2、第三開口O3的孔徑WO3、透光元件的高度（包括第一透光元件141的高度H1以及第二透光元件142的高度H2）以及光束B’在透光元件（包括第一透光元件141以及第二透光元件142）的入射表面的折射角（由光束B’的入射角以及透光元件的折射率決定）等。在透光元件的高度為定值的情況下，第一開口O1的孔徑WO1、第二開口O2的孔徑WO2以及第三開口O3的孔徑WO3越大，影像擷取元件130接收到的光束B’的角度範圍越大。在第一開口O1的孔徑WO1、第二開口O2的孔徑WO2以及第三開口O3的孔徑WO3為定值的情況下，透光元件的高度越大，影像擷取元件130接收到的光束B’的角度範圍越小。在第一開口O1的孔徑WO1、第二開口O2的孔徑WO2、第三開口O3的孔徑WO3以及透光元件的高度為定值的情況下，光束B’的折射角越大（也就是入射角越大），越有可能被吸光層吸收。在本實施例中，第一透光元件141以及第二透光元件142的折射率分別大於1，且例如落在1.3至1.7的範圍內。此外，各第一開口O1的孔徑WO1與第一透光元件141的高度H1比落在2至20的範圍內。各第二開口O2的孔徑WO2與第一透光元件141的高度H1比落在2至20的範圍內。各第三開口O3的孔徑WO3與第二透光元件142的高度H2比落在2至20的範圍內。然而，上述各透光元件的折射率以及開口的孔徑與透光元件的高度比可依據不同的設計需求（例如：影像擷取元件130的節距（pitch））改變，而不限於上述。Whether the light beam entering the first collimator 140 is absorbed by the light absorbing layer (including the first light absorbing layer 143, the second light absorbing layer 144, and the third light absorbing layer 145) may depend on the aperture WO1 of the first opening O1 and the second opening O2. The aperture WO2, the aperture WO3 of the third opening O3, the height of the light transmissive element (including the height H1 of the first light transmissive element 141 and the height H2 of the second light transmissive element 142), and the light beam B' in the light transmissive element (including the first The angle of refraction of the incident surface of the light transmitting element 141 and the second light transmitting element 142) (determined by the incident angle of the light beam B' and the refractive index of the light transmitting element). In the case where the height of the light transmitting member is constant, the aperture WO1 of the first opening O1, the aperture WO2 of the second opening O2, and the aperture WO3 of the third opening O3 are larger, and the light beam B' received by the image capturing element 130 is larger. The larger the range of angles. In the case where the aperture WO1 of the first opening O1, the aperture WO2 of the second opening O2, and the aperture WO3 of the third opening O3 are constant values, the height of the light transmitting element is larger, and the light beam B' received by the image capturing element 130 is larger. The smaller the range of angles. In the case where the aperture WO1 of the first opening O1, the aperture WO2 of the second opening O2, the aperture WO3 of the third opening O3, and the height of the light transmitting element are constant values, the angle of refraction of the beam B' is larger (that is, the angle of incidence) The larger it is, the more likely it is absorbed by the light absorbing layer. In the present embodiment, the refractive indices of the first light transmissive element 141 and the second light transmissive element 142 are respectively greater than 1, and fall, for example, in the range of 1.3 to 1.7. Further, the aperture WO1 of each of the first openings O1 and the height H1 of the first light transmitting member 141 fall within a range of 2 to 20. The aperture WO2 of each of the second openings O2 and the height H1 of the first light transmitting member 141 fall within a range of 2 to 20. The ratio of the aperture WO3 of each of the third openings O3 to the height H2 of the second light transmitting member 142 falls within the range of 2 to 20. However, the refractive index of each of the light transmissive elements and the height ratio of the aperture of the opening to the light transmissive element may vary according to different design requirements (eg, the pitch of the image capturing element 130), and are not limited thereto.
第一開口O1的孔徑WO1可大於或等於第二開口O2的孔徑WO2，且第二開口O2的孔徑WO2可大於或等於第三開口O3的孔徑WO3。在本實施例中，第一開口O1的孔徑WO1、第二開口O2的孔徑WO2與第三開口O3的孔徑WO3相同。進一步而言，第一開口O1、第二開口O2與第三開口O3具有相同或實質上相同的形狀以及尺寸。所謂實質上相同的形狀以及尺寸是考量到製作工藝所造成的誤差。此外，第一開口O1、第二開口O2與第三開口O3對齊於像素區PR，以使依序通過第一開口O1、第二開口O2與第三開口O3的光束能夠傳遞至影像擷取元件130（如圖4的光束B3’所顯示）。另外，像素區PR的尺寸可略大於第一開口O1的孔徑WO1、第二開口O2的孔徑WO2與第三開口O3的孔徑WO3，但不以此為限。再者，第一吸光層143或第二吸光層144可進一步配置在第一透光元件141的側壁面S1413上，以避免傳遞於第一透光元件141中的光束自側壁面S1413射出。第一吸光層143以及第二吸光層144可採用相同的材質且由同一道製作工藝圖案化形成，但不以此為限。在另一實施例中，第三吸光層145也可進一步配置在第二透光元件142的側壁面S1423上。或者，第一吸光層143以及第二吸光層144可以不配置在第一透光元件141的側壁面S1413上，且第三吸光層145可以不配置在第二透光元件142的側壁面S1423上。依據不同的需求，生物特徵辨識裝置100也可進一步增加透光元件以及吸光層的數量。The aperture WO1 of the first opening O1 may be greater than or equal to the aperture WO2 of the second opening O2, and the aperture WO2 of the second opening O2 may be greater than or equal to the aperture WO3 of the third opening O3. In the present embodiment, the aperture WO1 of the first opening O1, the aperture WO2 of the second opening O2 are the same as the aperture WO3 of the third opening O3. Further, the first opening O1, the second opening O2 and the third opening O3 have the same or substantially the same shape and size. The so-called substantially identical shape and size are considered to be errors caused by the manufacturing process. In addition, the first opening O1, the second opening O2 and the third opening O3 are aligned with the pixel area PR, so that the light beams sequentially passing through the first opening O1, the second opening O2 and the third opening O3 can be transmitted to the image capturing element. 130 (shown by beam B3' of Figure 4). In addition, the size of the pixel region PR may be slightly larger than the aperture WO1 of the first opening O1, the aperture WO2 of the second opening O2, and the aperture WO3 of the third opening O3, but not limited thereto. Furthermore, the first light absorbing layer 143 or the second light absorbing layer 144 may be further disposed on the sidewall surface S1413 of the first light transmitting element 141 to prevent the light beam transmitted in the first light transmitting element 141 from being emitted from the sidewall surface S1413. The first light absorbing layer 143 and the second light absorbing layer 144 may be formed of the same material and patterned by the same manufacturing process, but not limited thereto. In another embodiment, the third light absorbing layer 145 may be further disposed on the sidewall surface S1423 of the second light transmissive element 142. Alternatively, the first light absorbing layer 143 and the second light absorbing layer 144 may not be disposed on the sidewall surface S1413 of the first light transmitting element 141, and the third light absorbing layer 145 may not be disposed on the sidewall surface S1423 of the second light transmitting component 142. . According to different needs, the biometric device 100 can further increase the number of light transmitting elements and light absorbing layers.
利用吸光層（包括第一吸光層143、第二吸光層144以及第三吸光層145）吸收經待辨識物10作用且通過導光元件120的大角度光束（例如：光束B1’與光束B2’），可以使僅特定角度的光束（小角度入射的光束，例如：光束B3’）傳遞至影像擷取元件130。經由適當的調變第一開口O1的孔徑WO1、第二開口O2的孔徑WO2以及第三開口O3的孔徑WO3，可以使通過第一準直器140的光束B’能夠以0度或接近0度的角度入射影像擷取元件130。換句話說，第一準直器140有助於將傳遞至影像擷取元件130的光束準直化。如此，不但有助於濾除雜散光，還有助於避免從不同開口輸出的光束B’相互干擾的問題，使影像擷取元件130的取像品質提升。因此，生物特徵辨識裝置100可具有良好的辨識能力。圖3示意性地顯示第一開口O1、第二開口O2以及第三開口O3的形狀為圓形，但不以此為限。在其他實施例中，第一開口O1、第二開口O2以及第三開口O3的形狀也可以是三角形、四邊形、五邊形或其他多邊形。The light absorbing layer (including the first light absorbing layer 143, the second light absorbing layer 144, and the third light absorbing layer 145) absorbs the large-angle light beam that acts through the light-receiving object 10 and passes through the light guiding element 120 (for example, the light beam B1' and the light beam B2' The light beam of only a certain angle (a light beam incident at a small angle, for example, the light beam B3') can be transmitted to the image capturing element 130. By appropriately modulating the aperture WO1 of the first opening O1, the aperture WO2 of the second opening O2, and the aperture WO3 of the third opening O3, the beam B' passing through the first collimator 140 can be made 0 degrees or close to 0 degrees. The angle of incidence of the image capture component 130. In other words, the first collimator 140 helps to collimate the beam that is transmitted to the image capturing element 130. In this way, not only the stray light is filtered out, but also the problem that the light beams B' output from different openings interfere with each other is avoided, and the image capturing quality of the image capturing element 130 is improved. Therefore, the biometric device 100 can have good recognition capabilities. FIG. 3 schematically shows that the shape of the first opening O1, the second opening O2, and the third opening O3 is circular, but is not limited thereto. In other embodiments, the shape of the first opening O1, the second opening O2, and the third opening O3 may also be a triangle, a quadrangle, a pentagon or other polygons.
依據不同需求，生物特徵辨識裝置100還可包括其他元件。舉例而言，生物特徵辨識裝置100還可包括第二準直器170。第二準直器170位於導光元件120與第一準直器140之間，且第二準直器170位於待辨識物10作用後的光束B’的傳遞路徑上。舉例而言，第二準直器170可配置在表面S上，且導光元件120與第二準直器170可藉由連接機構或黏著層（例如：光學膠）而固定在一起，但不以此為限。The biometric device 100 can also include other components depending on various needs. For example, biometric device 100 can also include a second collimator 170. The second collimator 170 is located between the light guiding element 120 and the first collimator 140, and the second collimator 170 is located on the transmission path of the light beam B' after the object 10 is to be recognized. For example, the second collimator 170 can be disposed on the surface S, and the light guiding component 120 and the second collimator 170 can be fixed together by a connecting mechanism or an adhesive layer (eg, an optical glue), but not This is limited to this.
第二準直器170適於在光束B’通過第一準直器140之前，預先將光束B’準直化，以收斂光束B’的發散角。如此，可增加光束B’後續通過第一準直器140的機率。圖5為圖1中導光元件以及第二準直器的一種放大圖。請參照圖1及圖5，第二準直器170可包括多個稜鏡172，且稜鏡172的頂角TA分別指向導光元件120。在本實施例中，各稜鏡172的兩個底角BA的角度相同。然而，稜鏡172的頂角TA及底角BA可依據不同的需求改變，而不限於此。The second collimator 170 is adapted to pre-align the beam B' before the beam B' passes through the first collimator 140 to converge the divergence angle of the beam B'. As such, the probability of subsequent passage of beam B' through first collimator 140 can be increased. FIG. 5 is an enlarged view of the light guiding element and the second collimator of FIG. 1. FIG. Referring to FIGS. 1 and 5 , the second collimator 170 may include a plurality of turns 172 , and the apex angles TA of the turns 172 refer to the light guiding elements 120 , respectively. In the present embodiment, the angles of the two bottom corners BA of the respective turns 172 are the same. However, the apex angle TA and the bottom angle BA of the crucible 172 may vary depending on different needs, and are not limited thereto.
圖6為本發明另一實施例的生物特徵辨識裝置的剖面示意圖。圖6的生物特徵辨識裝置100A與圖1的生物特徵辨識裝置100相似，且生物特徵辨識裝置100A具有與生物特徵辨識裝置100相似的功效與優點，於此便不再重述。圖6的生物特徵辨識裝置100A與圖1的生物特徵辨識裝置100的差異在於光源110的位置不同。詳細而言，在圖6的實施例中，光源110位於導光元件120A的側面。在此架構下，導光元件120A例如為板狀，且導光元件120A可以省略圖1中導光元件120的入光部124。FIG. 6 is a cross-sectional view of a biometric device according to another embodiment of the present invention. The biometric device 100A of FIG. 6 is similar to the biometric device 100 of FIG. 1, and the biometric device 100A has similar functions and advantages as the biometric device 100, and will not be repeated here. The difference between the biometric device 100A of FIG. 6 and the biometric device 100 of FIG. 1 is that the position of the light source 110 is different. In detail, in the embodiment of FIG. 6, the light source 110 is located on the side of the light guiding element 120A. In this configuration, the light guiding element 120A is, for example, a plate shape, and the light guiding element 120A can omit the light incident portion 124 of the light guiding element 120 of FIG.
綜上所述，在本發明的實施例的生物特徵辨識裝置中，通過調變第一開口、第二開口與第三開口的孔徑來吸收經待辨識物作用且通過導光元件的大角度光束，以將傳遞至影像擷取元件的光束準直化，使影像擷取元件的取像品質提升。因此，生物特徵辨識裝置可具有良好的辨識能力。In summary, in the biometric device of the embodiment of the present invention, the large-angle light beam that acts through the light-guiding element and passes through the light-guiding element is absorbed by modulating the apertures of the first opening, the second opening, and the third opening. In order to collimate the light beam transmitted to the image capturing element, the image capturing quality of the image capturing element is improved. Therefore, the biometric device can have good recognition capabilities.
雖然本發明已以實施例揭露如上，然其並非用以限定本發明，任何所屬技術領域中具有通常知識者，在不脫離本發明的精神和範圍內，當可作些許的更動與潤飾，故本發明的保護範圍當視後附的申請專利範圍所界定者為準。Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.
10‧‧‧待辨識物10‧‧‧To be identified
100、100A‧‧‧生物特徵辨識裝置100, 100A‧‧‧ biometric identification device
110‧‧‧光源110‧‧‧Light source
112‧‧‧發光元件112‧‧‧Lighting elements
120、120A‧‧‧導光元件120, 120A‧‧‧Light guiding elements
122‧‧‧出光部122‧‧‧Lighting Department
124‧‧‧入光部124‧‧‧Into the Department of Light
130‧‧‧影像擷取元件130‧‧‧Image capture components
132‧‧‧電荷耦合元件132‧‧‧Charge-coupled components
140‧‧‧第一準直器140‧‧‧First collimator
141‧‧‧第一透光元件141‧‧‧First light transmitting element
142‧‧‧第二透光元件142‧‧‧Second light transmitting element
143‧‧‧第一吸光層143‧‧‧First light absorbing layer
144‧‧‧第二吸光層144‧‧‧second light absorbing layer
145‧‧‧第三吸光層145‧‧‧ third light absorbing layer
150‧‧‧電路板150‧‧‧ boards
160‧‧‧蓋板160‧‧‧ cover
170‧‧‧第二準直器170‧‧‧Second collimator
172‧‧‧稜鏡172‧‧‧稜鏡
B、B’、B1’、B2’、B3’‧‧‧光束B, B', B1', B2', B3'‧‧‧ beams
BA‧‧‧底角BA‧‧‧ bottom corner
C‧‧‧凹陷C‧‧‧ dent
H1、H2‧‧‧高度H1, H2‧‧‧ height
M‧‧‧微結構M‧‧‧Microstructure
O1‧‧‧第一開口O1‧‧‧ first opening
O2‧‧‧第二開口O2‧‧‧ second opening
O3‧‧‧第三開口O3‧‧‧ third opening
PR‧‧‧像素區PR‧‧‧Pixel Area
S、S’、S1411、S1412、S1421、S1422‧‧‧表面S, S', S1411, S1412, S1421, S1422‧‧‧ surface
S1‧‧‧第一反射面S1‧‧‧ first reflective surface
S2‧‧‧第二反射面S2‧‧‧ second reflecting surface
S1413、S1423‧‧‧側壁面S1413, S1423‧‧‧ side wall
TA‧‧‧頂角TA‧‧‧ top angle
WO1、WO2、WO3‧‧‧孔徑WO1, WO2, WO3‧‧‧ aperture
圖1為本發明一實施例的生物特徵辨識裝置的剖面示意圖。 圖2為圖1中導光元件的一種放大圖。 圖3為圖1中第一準直器的一種示意圖。 圖4為圖1中第一準直器、影像擷取元件以及電路板的一種剖面示意圖。 圖5為圖1中導光元件以及第二準直器的一種放大圖。 圖6為本發明另一實施例的生物特徵辨識裝置的剖面示意圖。1 is a schematic cross-sectional view of a biometric device according to an embodiment of the present invention. 2 is an enlarged view of the light guiding element of FIG. 1. 3 is a schematic view of the first collimator of FIG. 1. 4 is a cross-sectional view of the first collimator, the image capturing component, and the circuit board of FIG. 1. FIG. 5 is an enlarged view of the light guiding element and the second collimator of FIG. 1. FIG. FIG. 6 is a cross-sectional view of a biometric device according to another embodiment of the present invention.
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| CN201611209428.2A CN108241838A (en) | 2016-12-23 | 2016-12-23 | Biometric recognition device.It |
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| US9714865B2 (en) * | 2012-10-26 | 2017-07-25 | Sony Corporation | Light condensing unit, light condensing method, and optical detection system |
| US9727772B2 (en) * | 2013-07-31 | 2017-08-08 | Digilens, Inc. | Method and apparatus for contact image sensing |
| CN104182727B (en) * | 2014-05-16 | 2021-07-30 | 深圳印象认知技术有限公司 | Ultra-thin fingerprint and palm print acquisition device and fingerprint and palm print image acquisition method |
| US9829614B2 (en) * | 2015-02-02 | 2017-11-28 | Synaptics Incorporated | Optical sensor using collimator |
| CN105550664A (en) * | 2016-01-08 | 2016-05-04 | 上海箩箕技术有限公司 | Optical fingerprint sensor module |
-
2016
- 2016-12-23 CN CN201611209428.2A patent/CN108241838A/en active Pending
-
2017
- 2017-01-24 TW TW106102516A patent/TW201824069A/en unknown
- 2017-03-10 WO PCT/CN2017/076324 patent/WO2018113103A1/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI831001B (en) * | 2020-04-30 | 2024-02-01 | 美商豪威科技股份有限公司 | Lens-array imager |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108241838A (en) | 2018-07-03 |
| WO2018113103A1 (en) | 2018-06-28 |
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