Biometric recognition device

Abstract

A biometric recognition device includes a substrate, a photosensitive element layer on the substrate, a light angle control layer on the substrate, and a light transmission layer. The photosensitive element layer has a photosensitive element. The light angle control layer has a first light shielding layer and a second light shielding layer. The first light shielding layer has a light transmission region partially overlapping the photosensitive element. The light transmission layer is located above the photosensitive element layer. The light transmission layer has a protrusion partially overlapping the photosensitive element and the first light shielding layer. The second light shielding layer is disposed on a top surface and a side surface of the protrusion. The second light shielding layer and the first light shielding layer form an opening toward another side surface of the protrusion. When projected vertically on the substrate, a projection area of a portion of the light transmission region adjacent to the opening is smaller than a projection area of another portion of the light transmission region away from the opening.

Description

TECHNICAL FIELD

[0001] Some embodiments of the present disclosure relate to a biometric recognition device. BACKGROUND

[0002] The development of optical sensing technology opens up the possibility of diversified applications, such as smart bracelets, electronic products (e.g., laptops, smartphones, etc.) equipped with fingerprint recognition, and even display panels with optical touch function. Although the sensing technologies adopted by these products differ in terms of light sources, sensing elements, and detection targets, improving the sensitivity of optical sensing is a common problem that manufacturers must solve.

[0003] For example, in existing fingerprint recognition technology, when light shines on a fingerprint, the ups and downs of the fingerprint will cause different degrees of reflected light field. Therefore, different fingerprint patterns will be distinguished by the sensing element. A protective layer is usually provided on the fingerprint recognition device. However, when the protective layer is too thick, it may affect the effectiveness of fingerprint recognition. SUMMARY

[0004] The present disclosure aims to provide a biometric recognition device to solve at least one of the above problems.

[0005] Some embodiments of the present disclosure provide a biometric recognition device, comprising a substrate, a light sensing element layer, a light angle control layer, and a light transmission layer. The light sensing element layer is disposed on the substrate. The light sensing element layer has at least one light sensing element, which includes a first electrode, a second electrode, and a light sensing layer between the first electrode and the second electrode, and one of the first electrode or the second electrode is electrically connected to at least one reading element. The light angle control layer is disposed on the substrate. The light angle control layer has at least a first light shielding layer and a second light shielding layer. The first light shielding layer has at least one light transmission area and partially overlaps the light sensing element. The light transmission layer is disposed on the substrate and above the light sensing element layer. The light transmission layer has at least one protrusion and partially overlaps the light sensing element and the first light shielding layer. The second light shielding layer is disposed on the top surface and part of the side surface of the protrusion, the second light shielding layer and the first light shielding layer form an opening towards another part of the side surface of the protrusion, and when projected vertically on the substrate, the projection area of a part of the light transmission area adjacent to the opening is smaller than the projection area of another part of the light transmission area away from the opening.

[0006] In some embodiments, when projected vertically on the substrate, the edge of the second light shielding layer on the top surface and adjacent to the opening extends beyond the edge of the first light shielding layer on the side of the light transmission area adjacent to the opening.

[0007] In some embodiments, when projected vertically on the substrate, an edge of the second light shielding layer on the top surface and adjacent to the opening is flush with an edge of the first light shielding layer on the side of the light transmission area adjacent to the opening.

[0008] In some embodiments, a portion of the light transmission region is in communication with another portion of the light transmission region.

[0009] In some embodiments, a projection shape of the light transmission region, when projected orthogonally onto the substrate, comprises at least one of a lying T-shape, a half trapezoid, a trapezoid, a triangle, a step shape, and a polygon.

[0010] In some embodiments, the biometric recognition device further comprises a protective layer covering the light angle control layer and the substrate.

[0011] In some embodiments, the biometric recognition device further comprises a light transmission cover plate comprising at least one of a touch panel, a display panel, and a protective plate.

[0012] In some embodiments, the second light blocking layer is disposed on a portion of the side surface of the protrusion that is not parallel to the light sensing layer.

[0013] In some embodiments, the second light blocking layer is connected to the first light blocking layer to form an opening facing the other portion of the side surface of the protrusion.

[0014] In some embodiments, a portion of the second light blocking layer outside the protrusion is connected to a portion of the first light blocking layer to form an opening facing the other portion of the side surface of the protrusion.

[0015] In some embodiments, the first light blocking layer is not connected to at least one of the first electrode and the second electrode of the light sensing element.

[0016] In some embodiments, the second light blocking layer has an area of orthographic projection on the substrate that is substantially greater than or equal to an area of orthographic projection of the light sensing element on the substrate.

[0017] In some embodiments, the protrusion overlaps the light transmission region.

[0018] In summary, the light transmission region of the biometric recognition device of some embodiments of the present disclosure can be used to absorb less small-angle light and more large-angle light to improve the recognition of fingerprints. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A cross-sectional view of a biometric recognition device of some embodiments of the present disclosure is shown.

[0020] Figure 2 A cross-sectional view of a biometric recognition device of some other embodiments of the present disclosure is shown.

[0021] Figures 3A to 3E In some embodiments, the relative positions of the light transmission region and the second light blocking layer in region M, when projected orthogonally onto the substrate, are shown. Figure 1

[0022] ​Reference signs are as follows:

[0023] 50: Fingerprint

[0024] 100: Biometric recognition device

[0025] 105: Backlight module

[0026] 110: Substrate

[0027] 120: Light sensing element layer

[0028] 122: Light sensing element

[0029] 122A: First electrode

[0030] 122B: Second electrode

[0031] 122C: Light sensing layer

[0032] 130: Light angle control layer

[0033] 132: First light shielding layer

[0034] 132A: Light transmission area

[0035] 132AA: Part

[0036] 132AB: Part

[0037] 132AC: Part

[0038] 132E: Edge

[0039] 134: Second light shielding layer

[0040] 134E: Edge

[0041] 136: Dielectric layer

[0042] 140: Light transmission layer

[0043] 142: Protrusion

[0044] 142A: Top surface

[0045] 142B: Side surface

[0046] 142C: Side surface

[0047] 144: Opening

[0048] 150: Reading element

[0049] 160: Protective layer

[0050] 170: Light transmission cover plate

[0051] D1: First distance

[0052] L1: light

[0053] L2: light

[0054] M: region

[0055] M12: light-shielding conductive material

[0056] M14: reflective material DETAILED DESCRIPTION

[0057] In order to enable those skilled in the art to further understand the present disclosure, the preferred embodiments of the present disclosure are specifically described below, and the configuration content and the effects to be achieved of the present disclosure are explained in detail with the aid of the accompanying drawings.

[0058] The biometric recognition device of some embodiments of the present disclosure can be used to improve the recognition ability and clarity of biometric features (e.g., fingerprints). For example, the biometric recognition device of some embodiments of the present disclosure can absorb less small-angle incident light and more large-angle incident light to increase the contrast of biometric features. Specifically, the light collection ratio of small-angle incident light and large-angle incident light can be adjusted by adjusting the shape of the light transmission region for absorbing incident light. When using the biometric recognition device as in some embodiments of the present disclosure, the biometric recognition device can still clearly recognize biometric features even when using a thicker protective glass that also has protective properties.

[0059] Figure 1 A cross-sectional view of a biometric recognition device 100 of some embodiments of the present disclosure is shown. The biometric recognition device 100 can be provided in an electronic product (e.g., a notebook computer, a mobile phone, a tablet computer, an electronic lock, etc.) and used to recognize biometric features of a human body, such as a fingerprint 50. The biometric recognition device 100 includes a backlight module 105, a substrate 110, a light sensing element layer 120, a light angle control layer 130, and a light transmission layer 140. The backlight module 105 can be located below the substrate 110 and used to provide light to reflect biometric features. The light sensing element layer 120 is provided on the substrate 110. The light sensing element layer 120 has at least one light sensing element 122. For the sake of simplicity of the drawings, Figure 1This illustration only shows one photosensitive element 122, but in other embodiments, there may be multiple photosensitive elements 122, such as two or more. The photosensitive element 122 includes a first electrode 122A, a second electrode 122B, and a photosensitive layer 122C located between the first electrode 122A and the second electrode 122B. One of the first electrode 122A or the second electrode 122B is electrically connected to at least one read element 150. The read element 150 may be, for example, a thin-film transistor, but this disclosure is not limited thereto. Furthermore, the read element 150 in this embodiment is exemplified by a top-gate type, but it may also be a bottom-gate or other types, and this disclosure is not limited thereto. In some embodiments, the read element 150 contacts the substrate 110, and the first electrode 122A, the photosensitive layer 122C, and the second electrode 122B are stacked on the read element 150 from bottom to top.

[0060] A light angle control layer 130 is disposed on the substrate 110. The light angle control layer 130 has at least a first light-shielding layer 132 and a second light-shielding layer 134. The first light-shielding layer 132 is not connected to at least one of the first electrode 122A and the second electrode 122B of the photosensitive element 122. For example, the first light-shielding layer 132 is not connected to the first electrode 122A of the photosensitive element 122, and is only connected to the second electrode 122B of the photosensitive element 122, such as... Figure 1 As shown. The first light-shielding layer 132 has at least one light-transmitting area 132A that partially overlaps with the photosensitive element 122. For example, the light-transmitting area 132A may be an opening in the first light-shielding layer 132; in other words, the light-transmitting area 132A is the portion of the first light-shielding layer 132 that does not cover the photosensitive element 122. Therefore, light provided by the backlight module 105, after being reflected by the biometric feature, can enter the light-transmitting area 132A and illuminate the photosensitive element 122. In some embodiments, the first light-shielding layer 132 and the second light-shielding layer 134 are not completely parallel to the substrate 110. The light-transmitting area 132A may have different suitable shapes, for example, such as... Figures 3A to 3E As shown.

[0061] In some embodiments, the first light blocking layer 132 and the second light blocking layer 134 each comprise a stack of a light blocking conductive material M12 and a low reflective material M14. The light blocking conductive material M12 can be a metal such as Mo, Al or other metals or alloys, but can also be other light blocking conductive materials. The light blocking conductive material M12 can also be a single material layer or a stack of multiple material layers such as a Mo / Al / Mo stack. The low reflective material M14 can be a metal oxide or a metal oxynitride or other suitable low reflective material such as MoTaOx, MoTaOxNy, etc. The light blocking conductive material M12 can provide light blocking effect, and the low reflective material M14 can reduce the reflectivity of the light blocking conductive material M12 to ambient light incident from outside to avoid secondary reflection of light to reduce recognition rate. The low reflective material M14 has lower reflectivity than the light blocking conductive material M12. In addition, the ratio of the thickness of the low reflective material M14 to the total thickness of the low reflective material M14 and the light blocking conductive material M12 is, for example, less than 1 and greater than 0, but the present disclosure is not limited thereto. In other words, the thickness of the low reflective material M14 is, for example, less than 50% of the total thickness of the first light blocking layer 132, and the thickness of the low reflective material M14 is, for example, less than 50% of the total thickness of the second light blocking layer 134. The thickness of the light blocking conductive material M12 and the low reflective material M14 is, for example, less than or equal to 0.05 microns.

[0062] The light transmission layer 140 is disposed on the substrate 110 and on the light sensing element layer 120. In some embodiments, the light transmission layer 140 is disposed between the second light blocking layer 134 of the light angle control layer 130 and the light sensing element layer 120, and between the second light blocking layer 134 and the first light blocking layer 132. The light transmission layer 140 has at least one protrusion 142 partially overlapping the light sensing element 122 and the first light blocking layer 132. A portion of the protrusion 142 can be formed in a groove defined by the first light blocking layer 132, and the protrusion 142 can overlap the light transmission region 132A and contact the light sensing element 122 through the light transmission region 132A.

[0063] The second light blocking layer 134 is disposed on the top surface 142A and part of the side surface 142B of the protrusion 142. The second light blocking layer 134 is connected to the first light blocking layer 132 to form an opening 144 toward the other part of the side surface 142C of the protrusion 142, and the opening 144 has the light transmission layer 140 therein. Specifically, the second light blocking layer 134 can be a football gate shape, and cover the top surface 142A and the side surface 142B of the protrusion. The connected second light blocking layer 134 and the first light blocking layer 132 form the opening 144 toward the other part of the side surface 142C of the protrusion 142. In addition, the second light blocking layer 134 further covers the plane (not shown) connecting the side surface 142B and the side surface 142C of the protrusion 142. Figure 1That is, in addition to the opening 144, the second light-shielding layer 134 is U-shaped around the protrusion 142 as viewed from the top. In some embodiments, a portion of the second light-shielding layer 134 can be connected to a portion of the first light-shielding layer 132 through the dielectric layer 136, as shown in FIG. 1C. In other embodiments, a portion of the second light-shielding layer 134 can also be directly physically connected to a portion of the first light-shielding layer 132. In some embodiments, a portion of the second light-shielding layer 134 can be connected to a portion of the first light-shielding layer 132 outside the protrusion 142 to form the opening 144 facing the other side surface 142C of the protrusion 142, as shown in FIG. 1D. In other embodiments, a portion of the second light-shielding layer 134 can also be connected to a portion of the first light-shielding layer 132 inside the protrusion 142, i.e., there is a small hole in the protrusion 142 through which a portion of the second light-shielding layer 134 passes and is connected to a portion of the first light-shielding layer 132. In other words, the connection between the second light-shielding layer 134 and the first light-shielding layer 132 can be lower than the upper surface of the light-transmitting layer 140. In some embodiments, the top surface 142A of the protrusion 142 is parallel to the substrate 110. The side surface 142B and the side surface 142C of the protrusion 142 are located on opposite sides of the protrusion 142, and the side surface 142B is inclined to the substrate 110. Therefore, the second light-shielding layer 134 disposed on a portion of the side surface 142B of the protrusion 142 is also not parallel to the light-sensing layer 122C. Figure 1 Figure 1

[0064] As viewed from the top, the edge 134E of the second light-shielding layer 134 located on the top surface 142A and adjacent to the opening 144 can extend beyond the edge 132E of the first light-shielding layer 132 on the side of the light-transmitting region 132A adjacent to the opening 144, as shown in FIG. 1C. The edge 134E of the second light-shielding layer 134 located on the top surface 142A and adjacent to the opening 144 can be flush with the edge 132E of the first light-shielding layer 132 on the side of the light-transmitting region 132A adjacent to the opening 144, as shown in FIG. 1D. The portion of the second light-shielding layer 134 covering the light-transmitting region 132A can be used to shield ambient light. Figure 1 Figure 2

[0065] ​​​​In the present embodiment, the biometric recognition device 100 further comprises a protective layer 160 and a light-transmissive cover plate 170. The protective layer 160 covers the light angle control layer 130 and the substrate 110. The light-transmissive cover plate 170 is on the protective layer 160. The light-transmissive cover plate 170 can be a touch panel, a display panel, a protective plate or other cover plate, wherein the display panel can be of self-luminous type or non-self-luminous type. In other words, the user’s fingerprint 50 contacts the light-transmissive cover plate 170. The thicker the light-transmissive cover plate 170, the higher the protection capability. However, a too thick light-transmissive cover plate 170 can adversely affect the recognition of the fingerprint 50. In some embodiments of the present disclosure, however, the shape of the light-transmissive region 132A can be designed such that the recognition of the fingerprint can be improved even in the case of a thick light-transmissive cover plate 170.

[0066] With reference to Figure 1 With reference to Figure 3A In other words, the light-transmissive region 132A comprises a portion 132AA adjacent to the opening 144 and having a smaller projected area on the substrate 110, and another portion 132AB away from the opening 144 and having a larger projected area on the substrate 110. In other words, the light-transmissive region 132A comprises a portion 132AA adjacent to the opening 144 and having a projected area greater than zero, and another portion 132AB away from the opening 144 and having a larger projected area. The portion 132AA of the light-transmissive region 132A is in communication with the other portion 132AB of the light-transmissive region 132A, i.e. the light-transmissive region 132A is a continuous opening.

[0067] As mentioned above, the shape of the light-transmissive region 132A can increase the absorption of the large-angle incident light and reduce the absorption of the small-angle incident light, so as to increase the contrast of the biometric feature. Specifically, Figure 1Light emitted from the backlight module 105 is shown to pass through the light- transmitting layer 140 to the fingerprint 50 and then be reflected by the fingerprint 50 into the light- transmitting region 132A. The light reflected by the fingerprint 50 can be divided into reflected light LI at the air interface near the valleys of the fingerprint 50 and reflected light L2 at the skin interface near the ridges of the fingerprint 50. The ridges are the protruding parts of the fingerprint 50 and are in contact with the biometric recognition device 100, and the valleys are the recessed parts of the fingerprint 50 and are not in contact with the biometric recognition device 100. When light is incident on the valleys of the fingerprint 50, the light does not contact the fingerprint 50, so the light LI can be a mirror field type of light that is specularly reflected by the light-transmitting cover 170 of the surface of the biometric recognition device 100, and the reflection angle of the light LI is small. On the other hand, when light is incident on the ridges of the fingerprint 50, the light is directly reflected by the fingerprint 50. The refractive index of the fingerprint 50 is similar to that of the light-transmitting cover 170 of the surface of the biometric recognition device 100, so the light L2 is a uniform scattering field type of light, and the reflection angle of the light L2 is large. The small-angle light LI can be absorbed by a portion 132AA of the light-transmitting region 132A that is closer to the opening 144, and the large-angle light L2 can be absorbed by another portion 132AB of the light-transmitting region 132A that is farther from the opening 144. When the projected area of the portion 132AA of the light-transmitting region 132A that is closer to the opening 144 is smaller than the projected area of the other portion 132AB of the light-transmitting region 132A that is farther from the opening 144, the proportion of the absorbed small-angle light LI (i.e., the light reflected by the air interface near the valleys) decreases, and the proportion of the absorbed large-angle light L2 (i.e., the light reflected by the skin interface near the ridges) increases. In this way, the contrast between the valleys and the ridges of the fingerprint 50 can be increased, and the image of the fingerprint 50 can be more clear. Conversely, if the projected area of the portion 132AA of the light-transmitting region 132A that is adjacent to the opening 144 is greater than the projected area of the other portion 132AB of the light-transmitting region 132A that is farther from the opening 144, the portion 132AA of the light-transmitting region 132A that is adjacent to the opening 144 is more likely to receive more unnecessary light signals (e.g., more ambient light), and the background value can be too high. The fingerprint 50 can also be less clearly recognized.

[0068] Because Figure 1 the projected area of the portion 132AA of the light-transmitting region 132A that is adjacent to the opening 144 is smaller than the projected area of the other portion 132AB of the light-transmitting region 132A that is farther from the opening 144, more large-angle light L2 can be received, and the recognition ability of the biometric recognition device 100 for the fingerprint 50 can be improved. In this way, even if the thickness of the light-transmitting cover 170 is relatively thick, the biometric recognition device 100 of some embodiments of the present disclosure can still clearly recognize the fingerprint 50.

[0069] Since light L2 is a uniformly scattered light field, a portion 132AA of the light-transmitting area 132A near the opening 144 may also absorb some light L2. When the projected area of ​​the portion 132AA of the light-transmitting area 132A near the opening 144 is greater than zero and smaller than another portion 132AB of the light-transmitting area 132A away from the opening 144, it can simultaneously absorb more reflected light L2 from the interface between the ridges and the skin, and reduce reflected light L1 from the interface between the valleys and the air. In this way, the contrast of the fingerprint 50 can be increased, making the fingerprint 50 clearly distinguishable. When the projected area of ​​the portion 132AA of the light-transmitting area 132A near the opening 144 is equal to zero, the light energy reflected to the light-transmitting area 132A may not be sufficient to distinguish the fingerprint 50.

[0070] Figures 3A to 3E As shown in some embodiments, when projected vertically onto the substrate 110, Figure 1 The relative positions of the light-transmitting area 132A and the second light-shielding layer 134 in region M. For simplicity, Figures 3A to 3E Only the light-transmitting area 132A and a portion of the second light-shielding layer 134 are shown. In some embodiments, a first distance D1 exists between the edge 132E of the light-transmitting area 132A and the edge 134E of the second light-shielding layer 134 adjacent to the opening 144. The magnitude of the first distance D1 determines the amount of small-angle light L1 blocked by the second light-shielding layer 134. When the first distance D1 is large, more small-angle light L1 is blocked; when the first distance D1 is small, less small-angle light L1 is blocked. When more small-angle light L1 is blocked, the proportion of large-angle light L2 absorbed is relatively increased, thus improving the contrast of the fingerprint 50 and enhancing the image clarity of the fingerprint 50.

[0071] Figures 3A to 3E The projection shape of the light-transmitting area 132A is also shown when it is projected vertically onto the substrate 110. Figures 3A to 3E It can be a polygon of different shapes. The side edge of a portion 132AA of the light-transmitting area 132A may be discontinuous with the side edge of another portion 132AB of the light-transmitting area 132A. In some embodiments, the light-transmitting area 132A may be a flat T-shape (convex shape), such as... Figure 3A As shown. More specifically, Figure 3A A portion 132AA of the light-transmitting area 132A is rectangular, and another portion is rectangular, 132AB, with the projected area of ​​the other portion 132AB being larger than that of portion 132AA. Figure 3A In this configuration, a portion 132AA of the light-transmitting area 132A has its side edge offset inward parallel to the side edge of another portion 132AB of the light-transmitting area 132A. In some embodiments, the light-transmitting area 132A may be stepped, such as... Figure 3BMore specifically, the light-transmissive region 132A can include another portion 132AC that is farther away from the opening 144 than another portion 132AB. The projected area of the other portion 132AC of the light-transmissive region 132A is larger than that of the other portion 132AB of the light-transmissive region 132A, and the projected area of a portion 132AA of the light-transmissive region 132A that is closest to the opening 144 is smaller than that of the other portion 132AB of the light-transmissive region 132A.

[0072] In some embodiments, the light-transmissive region 132A can be semi-trapezoidal, as shown in FIG. 1C. Figure 3C More specifically, the light-transmissive region 132A can include another portion 132AC that is farther away from the opening 144 than another portion 132AB. The projected area of the other portion 132AC of the light-transmissive region 132A is larger than that of the other portion 132AB of the light-transmissive region 132A, and the projected area of a portion 132AA of the light-transmissive region 132A that is closest to the opening 144 is smaller than that of the other portion 132AB of the light-transmissive region 132A. Figure 3C In some embodiments, the light-transmissive region 132A can be semi-trapezoidal, as shown in FIG. 1C. Figure 3C In some embodiments, the light-transmissive region 132A can be semi-trapezoidal, as shown in FIG. 1C.

[0073] In some embodiments, the light-transmissive region 132A can be semi-trapezoidal, as shown in FIG. 1C. Figure 3D In some embodiments, the light-transmissive region 132A can be semi-trapezoidal, as shown in FIG. 1C. Figure 3E It should be noted that the shape of the light-transmissive region 132A is not limited to that shown in FIG. 1A, and shapes of the light-transmissive region 132A that are within the scope of the disclosure as disclosed above are included in the disclosure. Figures 3A to 3E It should be noted that the shape of the light-transmissive region 132A is not limited to that shown in FIG. 1A, and shapes of the light-transmissive region 132A that are within the scope of the disclosure as disclosed above are included in the disclosure.

[0074] In summary, the light-transmissive region of the biometric recognition device of some embodiments of the disclosure includes a portion that is adjacent to an opening through which light can enter and has a smaller projected area, and another portion that is farther away from the opening through which light can enter and has a larger projected area. The light-transmissive region can absorb more light reflected by ridges of a fingerprint and absorb less light reflected by air near valleys of the fingerprint, thereby improving the contrast and clarity of the fingerprint. In this way, when the biometric recognition device includes a protective layer of a certain thickness, the fingerprint will not be unclear due to the protective layer being too thick.

[0075] Although the disclosure has been disclosed with examples as above, it is not intended to limit the disclosure, and one of ordinary skill in the art can make some changes and modifications without departing from the spirit and scope of the disclosure, and the protection scope of the disclosure shall be subject to the appended claims.

Claims

1. A biometric recognition device, comprising: a substrate; a light sensing element layer disposed on the substrate, wherein a photosensitive element layer having at least one photosensitive element, the photosensitive element comprising a first electrode, a second electrode, and a photosensitive layer between the first electrode and the second electrode, and one of the first electrode or the second electrode is electrically connected to at least one reading element; a light angle control layer disposed on the substrate, wherein the light angle control layer has at least a first light shielding layer and a second light shielding layer, and the first light shielding layer has at least one light transmission area partially overlapping the photosensitive element; and a light transmission layer disposed on the substrate and above the photosensitive element layer, wherein the light transmission layer has at least one protrusion partially overlapping the photosensitive element and the first light shielding layer, the second light shielding layer is disposed on a top surface and part of a side surface of the protrusion, the second light shielding layer and the first light shielding layer form an opening toward another part of the side surface of the protrusion, and a part of the light transmission area adjacent to a projection area of the opening is smaller than another part of the light transmission area away from the projection area of the opening in a vertical projection on the substrate.

2. The biometric recognition device of claim 1, wherein, An edge of the second light shielding layer on the top surface and adjacent to the opening extends beyond an edge of the first light shielding layer on a side of the light transmission area adjacent to the opening in the vertical projection on the substrate.

3. The biometric recognition device of claim 1, wherein, An edge of the second light shielding layer on the top surface and adjacent to the opening is cut flush with an edge of the first light shielding layer on a side of the light transmission area adjacent to the opening in the vertical projection on the substrate.

4. The biometric recognition device of any one of claims 1 to 3, wherein, A part of the light transmission area is connected to another part of the light transmission area. 5.The biometric recognition device of claim 1, wherein a projection shape of the light transmission area in the vertical projection on the substrate comprises at least one of a flat T shape, a half trapezoid, a trapezoid, a triangle, a step shape, and a polygon. 6.The biometric recognition device of claim 1, further comprising a protective layer covering the light angle control layer and the substrate. 7.The biometric recognition device of claim 1, further comprising a light transmission cover plate comprising at least one of a touch panel, a display panel, and a protective plate.

8. The biometric recognition device of claim 1, wherein, The second light shielding layer disposed on the part of the side surface of the protrusion is not parallel to the photosensitive layer.

9. The biometric recognition device of claim 1, wherein, The second light shielding layer and the first light shielding layer are connected to form the opening toward the another part of the side surface of the protrusion.

10. The biometric recognition device of claim 9, wherein, A part of the second light shielding layer outside the protrusion is connected to a part of the first light shielding layer to form the opening toward the another part of the side surface of the protrusion.

11. The biometric recognition device of claim 1, wherein, The first light shielding layer is not connected to at least one of the first electrode and the second electrode of the photosensitive element.

12. The biometric recognition device of claim 1, wherein, An area of a normal projection of the second light shielding layer on the substrate is substantially greater than or equal to an area of a normal projection of the photosensitive element on the substrate.

13. The biometric recognition device of claim 1, wherein, The protrusion overlaps the light transmission area.

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