TWM553003U - Biological feature identification device - Google Patents

Abstract

A biological feature identification device including a light source, a light guide element, an image capturing element, and a first collimator is provided. The light source is adapted to provide a light beam. The light guide element is located on a transmission path of the light beam. The image capturing element is located below the light guide element and has pixel regions. The first collimator is located between the light guide element and the image capturing element and includes a first collimating element and a second collimating element. The first collimating element includes first light absorbing elements arranged at intervals. The second collimating element is overlapped with the first collimating element and includes second light absorbing elements arranged at intervals. The second light absorbing elements are staggered with the first light absorbing elements to define light transmissive regions overlapped with the pixel regions.

Description

Biometric identification device

The novel creation is related to a biometric identification device.

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.

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.

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.

The novel creation provides a biometric identification device.

The biometric identification device created by the present invention comprises 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 includes a first collimating element and a second collimating element. The first collimating element includes a plurality of first light absorbing elements arranged in a compartment. The second collimating element overlaps the first collimating element and includes a plurality of second light absorbing elements arranged in a compartment. The second light absorbing element is interleaved with the first light absorbing element to define a plurality of light transmitting regions. The light transmissive area overlaps the pixel area.

In an embodiment of the present 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.

In an embodiment of the novel creation, the light source is located on a side of the light guiding element.

In an embodiment of the present invention, the light guiding element is formed with a plurality of microstructures facing the surface of the first collimator. The microstructure is convex or concave on the surface.

In an embodiment of the present invention, the first collimating element further includes a plurality of first light transmissive elements. The first light absorbing element and the first light transmitting element are alternately arranged and connected to each other. The second collimating element further includes a plurality of second light transmissive elements. The second light absorbing element and the second light transmitting element are alternately arranged and connected to each other. The refractive indices of the first light transmitting element and the second light transmitting element are each greater than 1.

In an embodiment of the present invention, the refractive indices of the first light transmissive element and the second light transmissive element are respectively in the range of 1.3 to 1.7.

In an embodiment of the present invention, the width and height ratios of the first light transmitting element and the second light transmitting element are respectively in the range of 2 to 20.

In an embodiment of the present invention, the first light absorbing element and the first light transmitting element are alternately arranged in a first direction and respectively extend in a second direction intersecting the first direction. The second light absorbing element and the second light transmitting element are alternately arranged in the second direction and respectively extend in the first direction.

In an embodiment of the present invention, the biometric device further includes a cover plate, wherein the light guiding element is located between the cover plate and the first collimator.

In an embodiment of the present invention, the biometric device further includes a second collimator. The second collimator is located between the light guiding element and the first collimator and includes a plurality of turns. The top corner of the cymbal refers to the light guide element.

Based on the above, in the biometric device of the embodiment of the present invention, the first light absorbing element and the second light absorbing element are used to absorb the large-angle light beams in different directions to collimate the light beam transmitted to the image capturing element. Improve the image quality of the image capture component. Therefore, the biometric device can have good recognition capabilities.

The above described features and advantages of the present invention will become more apparent and understood from the following description.

Reference will now be made in detail to the exemplary embodiments of the embodiments herein Wherever possible, the same element symbols are used in the drawings and the description

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.

The biometric device 100 includes a light source 110, a light guiding element 120, an image capturing element 130, and a first collimator 140.

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.

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.

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.

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.

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.

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.

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.

3A is a top plan view of the first collimating element of the first collimator of FIG. 1. 3B is a top plan view of the second collimating element of the first collimator of FIG. 1. 3C is a top plan view of the first collimating element of FIG. 3A and the second collimating element of FIG. 3B. 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. 3A to FIG. 4 , the first collimator 140 includes a first collimating element 142 and a second collimating element 144 overlapping the first collimating element 142 . In the present embodiment, the second collimating element 144 is located between the first collimating element 142 and the image capturing element 130. However, the positions of the first collimating element 142 and the second collimating element 144 may also be reversed. In addition, the first collimating element 142 and the second collimating element 144 may be fixed together by a connecting mechanism or an adhesive layer (for example, an optical adhesive), but not limited thereto.

The first collimating element 142 includes a plurality of first light absorbing elements B1 arranged in a compartment. The second collimating element 144 includes a plurality of second light absorbing elements B2 arranged in a compartment. The second light absorbing element B2 is interleaved with the first light absorbing element B1 to define a plurality of light transmitting regions TR. The light transmitting region TR is overlapped with the pixel region PR.

In the embodiment, the first collimating element 142 may further include a plurality of first light transmissive elements T1. The first light absorbing element B1 and the first light transmitting element T1 are alternately arranged and connected to each other. That is, the width W1 of the first light transmissive element T1 is the distance between the adjacent two first light absorbing elements B1. For example, the first light absorbing element B1 and the first light transmitting element T1 may be alternately arranged in the first direction D1 and extend in the second direction D2 intersecting the first direction D1, respectively. The second direction D2 is, for example, perpendicular to the first direction D1, but is not limited thereto.

Likewise, the second collimating element 144 can further include a plurality of second light transmissive elements T2. The second light absorbing element B2 and the second light transmitting element T2 are alternately arranged and connected to each other. That is, the width W2 of the second light transmitting element T2 is the distance between the adjacent two second light absorbing elements B2. For example, the second light absorbing element B2 and the second light transmitting element T2 may be alternately arranged in the second direction D2 and respectively extend along the first direction D1.

It should be noted that the arrangement and extending direction of the first light absorbing element B1 and the first light transmitting element T1 and the arrangement and extending direction of the second light absorbing element B2 and the second light transmitting element T2 are not limited to the above. For example, the arrangement and extension directions of the first light absorbing element B1 and the first light transmitting element T1 and the arrangement and extension directions of the second light absorbing element B2 and the second light transmitting element T2 may be reversed. Alternatively, the arrangement direction of the first light absorbing element B1 and the first light transmitting element T1 may be the same as the arrangement direction of the second light absorbing element B2 and the second light transmitting element T2, but the first light absorbing element B1 and the first light transmitting element T1 The extending direction is different from the extending direction of the second light absorbing element B2 and the second light transmitting element T2. In an embodiment, the first light transmissive element T1 and the second light transmissive element T2 may be omitted.

The area of each of the light-transmitting regions TR is equal to the product of the distance between the adjacent two first light-absorbing elements B1 and the distance between the adjacent two second light-absorbing elements B2, and is also equal to the width W1 and the second of the first light-transmitting elements T1. The product of the width W2 of the light transmissive element T2. In FIGS. 3A to 3C, the width W1 is equal to the width W2, but is not limited thereto. The overlapping of the light-transmitting region TR in the pixel region PR means that the light-transmitting region TR can pass through the light beam B′ of the light-guiding element 120 and pass through the light-receiving element 120, and can be transmitted to the pixel region PR without being limited to The size of the light area TR is greater than or equal to the pixel area PR. In this embodiment, the side length of the pixel region PR may be slightly larger than the width W1 of the first light transmissive element T1 and the width W2 of the second light transmissive element T2, but not limited thereto.

Under the structure that the second collimating element 144 is located between the first collimating element 142 and the image capturing element 130, the light beam B' acting through the object to be recognized 10 and passing through the light guiding element 120 first passes through the first collimating element. After the action of 142 (eg, collimation), it is again acted upon by the second collimating element 144 (eg, collimated). 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 T1, the first light transmitting element T1 is incident. The light beam enters the first light transmissive element T1 via the refracting on the light incident surface of the first light transmissive element T1. Thus, the arrangement of the first light transmissive element T1 helps to converge the angle of the beam entering the first collimating element 142, thereby allowing more of the light beam to pass through the first collimating element 142 and to the second collimating element 144. Similarly, when the refractive index of the light transmission medium (for example, air or optical glue) between the first collimating element 142 and the second collimating element 144 is different from the refractive index of the second light transmissive element T2, the second is incident. The light beam of the light transmissive element T2 enters the second light transmissive element T2 via the refracting on the light incident surface of the second light transmissive element T2. Thus, the arrangement of the second light transmissive element T2 helps to converge the angle of the light beam entering the second collimating element 144, thereby allowing more of the light beam to pass through the second collimating element 144 and to the image capturing element 130.

The material of the first light transmissive element T1 and the second light transmissive element T2 may be glass, polycarbonate (PC), polymethyl methacrylate (PMMA) or other suitable materials. The material of the first light absorbing element B1 and the second light absorbing element B2 may be, for example, a silicone-based or acryl-based material containing a light absorbing material (for example, carbon). As a result, if the incident angle is too large, the light beam B' that acts through the light-receiving object 10 and passes through the light-guiding element 120 may be absorbed by the first light-absorbing element B1 or the second light-absorbing element B2 and cannot be transmitted to the image capturing element. 130. Specifically, the first light absorbing element B1 is adapted to converge the divergence angle of the light beam B' in the arrangement direction of the first light absorbing element B1 (for example, the first direction D1), and the second light absorbing element B2 is adapted to converge the light beam B' at the The divergence angle in the direction in which the two light absorbing elements B2 are arranged (for example, the second direction D2). Taking the light beam B1 ′ and the light beam B2 ′ of FIG. 4 as an example, after the light beam B1 ′ entering the second light transmitting element T2 at a small angle enters the second light transmitting element T2 , the second light absorbing element B2 is not located in the transmission path of the light beam B1 ′. Therefore, the light beam B1' is not absorbed by the second light absorbing element B2 but can be transmitted to the image capturing element 130. In contrast, after entering the second light transmitting element T2 at a large angle incident on the second light transmitting element T2, since the second light absorbing element B2 is located in the transmission path of the light beam B2', the light beam B2' will be The two light absorbing elements B2 are absorbed.

Whether the light beam entering the collimating element (including the first collimating element 142 and the second collimating element 144) is absorbed by the light absorbing element (including the first light absorbing element B1 and the second light absorbing element B2) (that is, whether the light absorbing element is located or not) The transmission path of the light beam of the optical element may depend on the width of the light transmissive element (including the width W1 of the first light transmissive element T1 and the width W2 of the second light transmissive element T2), the height of the light transmissive element (including the first light transmission) The height H1 of the element T1 and the height H2 of the second light transmitting element T2) and the angle of refraction of the light beam B' on the light incident surface of the light transmitting element (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 larger the width of the light transmitting member, the larger the angular range of the light beam B' received by the image capturing member 130. In the case where the width of the light transmitting member is constant, the larger the height of the light transmitting member, the smaller the angular range of the light beam B' received by the image capturing member 130. In the case where the width and height of the light transmitting member are constant, the larger the angle of refraction of the light beam B' (i.e., the larger the incident angle), the more likely it is absorbed by the light absorbing element. In the present embodiment, the refractive indices of the first light transmissive element T1 and the second light transmissive element T2 are respectively greater than 1, and fall, for example, in the range of 1.3 to 1.7. Further, the width to height ratios of the first light transmissive element T1 and the second light transmissive element T2 fall within the range of 2 to 20, respectively. However, the refractive index of the light transmissive element and the width to height ratio of the light transmissive element may vary depending on different design requirements (eg, the pitch of the image capturing element 130), and are not limited to the above.

A large-angle beam in different directions (for example, the first direction D1 and the second direction D2) of the light beam B' that acts through the light-receiving element 10 and passes through the light-guiding element 120 by the first light-absorbing element B1 and the second light-absorbing element B2 Absorption allows light beams of only a certain angle (light beams incident at a small angle) to be transmitted to the image capturing element 130. The light beam B' passing through the first collimator 140 can be incident on the image capturing element 130 at an angle of 0 degrees or near 0 degrees via appropriate modulation. 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 output from the different light-transmitting elements 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.

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.

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.

6 is a schematic 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.

In summary, in the biometric device of the presently-created embodiment, the first light absorbing element and the second light absorbing element are used to absorb the large-angle light beams in different directions to collimate the light beam transmitted to the image capturing element. The image capture quality of the image capture component is improved. Therefore, the biometric device can have good recognition capabilities.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the novel creation, and any person skilled in the art can make some changes without departing from the spirit and scope of the novel creation. Retouching, the scope of protection of this new creation is subject to the definition of the scope of the patent application attached.

10‧‧‧To be identified
100, 100A‧‧‧ biometric identification device
110‧‧‧Light source
112‧‧‧Lighting elements
120, 120A‧‧‧Light guiding elements
122‧‧‧Lighting Department
124‧‧‧Into the Department of Light
130‧‧‧Image capture components
132‧‧‧Charge-coupled components
140‧‧‧First collimator
142‧‧‧First collimating element
144‧‧‧Second alignment element
150‧‧‧ boards
160‧‧‧ cover
170‧‧‧Second collimator
172‧‧‧稜鏡
B, B', B1', B2' ‧ ‧ beams
B1‧‧‧First light absorbing element
B2‧‧‧second light absorbing element
BA‧‧‧ bottom corner
C‧‧‧ dent
D1‧‧‧ first direction
D2‧‧‧ second direction
H1, H2‧‧‧ height
M‧‧‧Microstructure
PR‧‧‧Pixel Area
S, S'‧‧‧ surface
S1‧‧‧ first reflective surface
S2‧‧‧ second reflecting surface
T1‧‧‧First light transmitting element
T2‧‧‧Second light transmitting element
TA‧‧‧ top angle
TR‧‧‧Light transmission area
W1, W2‧‧‧ width

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. 3A is a top plan view of the first collimating element of the first collimator of FIG. 1. 3B is a top plan view of the second collimating element of the first collimator of FIG. 1. 3C is a top plan view of the first collimating element of FIG. 3A and the second collimating element of FIG. 3B. 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. 6 is a schematic cross-sectional view of a biometric device according to another embodiment of the present invention.

130‧‧‧Image capture components

132‧‧‧Charge-coupled components

142‧‧‧First collimating element

144‧‧‧Second alignment element

150‧‧‧ boards

B’, B1’, B2’‧‧‧ beams

B1‧‧‧First light absorbing element

B2‧‧‧second light absorbing element

D1‧‧‧ first direction

D2‧‧‧ second direction

H1, H2‧‧‧ height

PR‧‧‧Pixel Area

T2‧‧‧Second light transmitting element

W2‧‧‧Width

Claims (10)

A biometric identification device comprising: a light source adapted to provide a light beam; a light guiding element located on a transmission path of the light beam; an image capturing element positioned below the light guiding element and having a plurality of pixel regions; and first a collimator between the light guiding element and the image capturing element, wherein the first collimator comprises: a first collimating element comprising a plurality of first light absorbing elements arranged in a compartment; and a second collimating element, overlapping the first collimating element and including a plurality of second light absorbing elements arranged in a compartment, wherein the plurality of second light absorbing elements are interleaved with the plurality of first light absorbing elements to define a plurality of a light transmitting region, wherein the plurality of light transmitting regions overlap the plurality of pixel regions. The biometric identification device of claim 1, wherein 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 being located together Below the light exit portion, the light incident portion is located between the light source and the light exit portion. The biometric device of claim 1, wherein the light source is located on a side of the light guiding element. The biometric device of claim 1, wherein the light guiding element faces a surface of the first collimator and has a plurality of microstructures, the plurality of microstructures being convex or concave The surface. The biometric identification device of claim 1, wherein the first collimating element further comprises a plurality of first light transmissive elements, the plurality of first light absorbing elements and the plurality of first light transmissive elements The elements are alternately arranged and connected to each other, and the second collimating element further includes a plurality of second light transmitting elements, the plurality of second light absorbing elements and the plurality of second light transmitting elements are alternately arranged and connected to each other, and The refractive indices of the plurality of first light transmissive elements and the plurality of second light transmissive elements are each greater than one. The biometric device of claim 5, wherein the refractive indices of the plurality of first light transmissive elements and the plurality of second light transmissive elements fall within a range of 1.3 to 1.7, respectively. The biometric device of claim 5, wherein a width to height ratio of the plurality of first light transmissive elements and the plurality of second light transmissive elements falls within a range of 2 to 20, respectively. The biometric device of claim 5, wherein the plurality of first light absorbing elements and the plurality of first light permeable elements are alternately arranged in a first direction and respectively intersecting the first direction Extending in a second direction, the plurality of second light absorbing elements and the plurality of second light permeable elements are alternately arranged along the second direction and respectively extend along the first direction. The biometric identification device of claim 1, further comprising: a cover plate, wherein the light guiding element is located between the cover plate and the first collimator. The biometric identification device of claim 1, further comprising: a second collimator located between the light guiding element and the first collimator, the second collimator comprising a plurality of And the apex angles of the plurality of turns are respectively directed to the light guiding elements.