Fingerprint module and electronic device

Abstract

The application relates to the fingerprint identification technical field, in particular to a fingerprint module and an electronic device, the fingerprint module comprises a first shielding layer, a second shielding layer and a photosensitive element, the first shielding layer is provided with a plurality of first through holes, the first through holes are used for transmitting light gathered by a condenser lens, the first shielding layer is arranged on one side of the condenser lens and is used for shielding at least part of noise light; the second shielding layer is arranged on the side, away from the condenser lens, of the first shielding layer, the second shielding layer is provided with a plurality of second through holes, the second through holes are arranged correspondingly with the first through holes, so that the light passing through the first through holes passes through the second through holes, and the second shielding layer is used for shielding interference light; the photosensitive element is arranged on the side, away from the first shielding layer, of the second shielding layer, and the photosensitive element is used for collecting the light passing through the second through holes. The fingerprint module of the application can accurately transmit target light, has strong selectivity, has no light intensity loss, improves the signal-to-noise ratio of the fingerprint module, and improves the imaging quality.

Description

Technical Field

[0001] This application relates to the field of fingerprint recognition technology, and in particular to a fingerprint module and electronic device. Background Technology

[0002] Fingerprint recognition boasts advantages such as ease of operation and high security, leading to its widespread application across various fields, including display devices like mobile phones and tablets. However, in fingerprint recognition, the reflected light from a finger has no fixed direction, resulting in low signal-to-noise ratios in the fingerprint image and hindering accurate identification. Summary of the Invention

[0003] In view of this, the main technical problem to be solved by this application is to provide a fingerprint module and electronic device that can improve the signal-to-noise ratio of fingerprint imaging.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a fingerprint module, including a first shielding layer, a second shielding layer, and a photosensitive element. The first shielding layer has a plurality of first through holes, which are used to transmit light gathered by a condenser lens. The first shielding layer is disposed on one side of the condenser lens and is used to block at least part of the oblique light. The second shielding layer is disposed on the side of the first shielding layer away from the condenser lens. The second shielding layer has a plurality of second through holes, which are correspondingly disposed with the first through holes, so that light passing through the first through holes passes through the second through holes. The second shielding layer is used to block interfering light. The photosensitive element is disposed on the side of the second shielding layer away from the first shielding layer and is used to collect light passing through the second through holes.

[0005] The first through hole is located within the focal length range of the condenser lens, and the second through hole is located outside the focal length range of the condenser lens.

[0006] The first through hole and the second through hole are both located within the focal length range of the condenser lens, and the defocus distance of the first through hole is greater than that of the second through hole.

[0007] The first through hole and the second through hole are both located outside the focal length range of the condenser lens, and the defocus distance of the first through hole is smaller than that of the second through hole.

[0008] The first and second through holes are located close to the focal plane of the condenser lens.

[0009] The ratio of the diameter of the first through hole to the diameter of the second through hole is the same as the ratio of the defocus distance of the first through hole to the defocus distance of the second through hole.

[0010] The diameter of the first through hole is the sum of the diameter of the light spot formed on the first shielding layer by the vertically incident light rays passing through the condenser lens and the compensation for process deviation.

[0011] The first shielding layer and the second shielding layer are arranged in parallel; the line connecting the center of the first through hole and the second through hole is perpendicular to the first shielding layer or the second shielding layer.

[0012] Among them, noisy light includes oblique light; interfering light includes large-angle light passing through adjacent or nearby focusing lenses.

[0013] The material of the first shielding layer and / or the second shielding layer includes black organic adhesive, and the first through hole and the second through hole are etched holes.

[0014] The fingerprint module also includes several focusing lenses, which are disposed on the side of the first shielding layer away from the second shielding layer, and are disposed corresponding to the first through hole.

[0015] The projection of the focusing lens onto the first shielding layer covers the first through hole.

[0016] This application also includes a second technical solution: an electronic device including a display panel and the aforementioned fingerprint module, wherein the fingerprint module is disposed on the back of the display panel or disposed in the display panel.

[0017] The display panel includes an encapsulation layer and several arrayed light-emitting units, with the encapsulation layer encapsulating the light-emitting units. The electronic device also includes a condenser lens, which is disposed on the side of the encapsulation layer of the display panel opposite to the light-emitting units.

[0018] The beneficial effects of this application are as follows: Unlike existing technologies, the fingerprint module of this application, through a first through-hole formed on a first shielding layer and a second through-hole formed on a second shielding layer, both the first and second through-holes function to collimate light. In the embodiments of this application, the first shielding layer can block at least a portion of noisy light, and the second shielding layer can block interfering light. In the embodiments of this application, the target light incident on the condenser lens can pass through the first through-hole, which achieves a collimating effect; the light passing through the first through-hole further passes through the second through-hole to reach the photosensitive element, where the second through-hole further achieves a collimating effect. The fingerprint module of this application embodiment can accurately transmit target light in the required direction, with strong selectivity and no light intensity loss, while improving the signal-to-noise ratio of the fingerprint module and improving image quality. Attached Figure Description

[0019] Figure 1 This is a partial cross-sectional structural diagram of an embodiment of the fingerprint module of this application;

[0020] Figure 2a This is a partial cross-sectional structural diagram of another embodiment of the fingerprint module of this application;

[0021] Figure 2bThis is a partial cross-sectional structural diagram of another embodiment of the fingerprint module of this application;

[0022] Figure 3 This is a partial cross-sectional structural diagram of another embodiment of the fingerprint module of this application;

[0023] Figure 4 This is a simulation diagram of the brightness transmittance percentage of the fingerprint module in this application;

[0024] Figure 5 This is a partial cross-sectional structural diagram of another embodiment of the fingerprint module of this application;

[0025] Figure 6 This is a cross-sectional structural schematic diagram of an embodiment of the electronic device of this application;

[0026] Figure 7a This is a cross-sectional structural schematic diagram of another embodiment of the electronic device of this application;

[0027] Figure 7b This is a cross-sectional structural schematic diagram of another embodiment of the electronic device of this application;

[0028] Figure 8 This is a cross-sectional structural schematic diagram of another embodiment of the electronic device of this application;

[0029] Figure 9 This is a cross-sectional structural schematic diagram of yet another embodiment of the electronic device of this application. Detailed Implementation

[0030] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0031] In related technologies, to improve fingerprint imaging quality and increase the signal-to-noise ratio, a collimated optical path needs to be added to the fingerprint module to make the reflected light selective. One solution is to add a thick through-hole between the diffuse reflection optical path and the photosensitive element, utilizing the sidewalls of the through-hole to reflect the diffuse reflection of the fingerprint, allowing perpendicularly incident light to pass through the through-hole and reach the photosensitive element. However, in this solution, the hole depth is relatively large; typically, the diameter-to-depth ratio of the through-hole is 1:10. For example, when the diameter of the through-hole is 16 micrometers, the depth is 160 micrometers, resulting in a very large penetration depth and a large fingerprint module thickness, which is detrimental to the thinner and lighter design of electronic devices.

[0032] This application provides a fingerprint module, such as... Figure 1 and Figure 2aAs shown, the fingerprint module includes a first shielding layer 100, a second shielding layer 200, and a photosensitive element 400. The first shielding layer 100 has a plurality of first through holes 110, which are used to transmit light converged by a condenser lens 300. The first shielding layer 100 is disposed on one side of the condenser lens 300 to block at least part of the oblique light. The second shielding layer 200 is disposed on the side of the first shielding layer 100 away from the condenser lens 300. The second shielding layer 200 has a plurality of second through holes 210, which are correspondingly disposed with the first through holes 110, so that light passing through the first through holes 110 passes through the second through holes 210. The second shielding layer 200 is used to block interfering light. The photosensitive element 400 is disposed on the side of the second shielding layer 200 away from the first shielding layer 100, and the photosensitive element 400 is used to collect light passing through the second through holes 210.

[0033] In this embodiment, the noise light is light that is not intended to be transmitted. For example, in one embodiment, the target light is an incident light with an angle of 0°-6° (light perpendicular to the plane of the condenser lens 300), and the noise light is an incident light with an angle greater than 6°. In another embodiment, the noise light includes oblique light. Oblique light includes, for example, small-angle light and large-angle light. Small-angle light is light with an angle greater than 6° and less than or equal to 15°, and large-angle light is light with an angle greater than 15°. In another embodiment, the noise light includes small-angle light. The above are merely examples and do not limit the noise light in this embodiment. For example, the target light could also be an incident light with an angle of 0°; the noise light could be an incident light with an angle greater than 0°; or the target light could also be an incident light with an angle of 0°-10°; the noise light could be an incident light with an angle greater than 10°, small-angle light is light with an angle greater than 10° and less than or equal to 15°, and large-angle light is light with an angle greater than 15°. The embodiments of this application do not limit the range of small-angle incident light rays and the range of large-angle light rays. In other embodiments, the range of small-angle incident light rays and the range of large-angle light rays may also be other ranges.

[0034] In this embodiment, the interfering light includes light rays passing through adjacent or nearby condenser lenses 300. For example, some large-angle oblique light rays are converged by the condenser lens 300 and pass through adjacent or nearby first through-holes 110, forming interfering light rays. In one embodiment of this application, the interfering light includes large-angle light rays passing through adjacent or nearby condenser lenses 300.

[0035] The fingerprint module of this application embodiment utilizes a first through-hole 110 formed on the first shielding layer 100 and a second through-hole 210 formed on the second shielding layer 200. The first through-hole 110 and the second through-hole 210 are used to focus light through the condenser lens 300, thereby reducing the thickness, material, and cost of the fingerprint module. In this embodiment, both the first through-hole 110 and the second through-hole 210 collimate the light. The first shielding layer 100 blocks some noise light, and the second shielding layer 200 blocks interfering light. In this embodiment, target light incident on the condenser lens 300 can pass through the first through-hole 110, achieving collimation. The light passing through the first through-hole 110 further passes through the second through-hole 210 to reach the photosensitive element 400, further achieving collimation. The fingerprint module of this application embodiment can accurately transmit target light in the required direction, with strong selectivity and no light intensity loss. At the same time, it can improve the signal-to-noise ratio of the fingerprint module and improve the imaging quality.

[0036] In this embodiment, the first through hole 110, the second through hole 210, and the condenser lens 300 are provided in a one-to-one correspondence.

[0037] Specifically, in this embodiment, the first shielding layer 100 has a plurality of first through holes 110. For ease of understanding, this application takes three first through holes 110 as an example, namely, first through holes 111, 112, and 113 arranged sequentially at intervals. The first shielding layer 100 includes a plurality of first shielding portions 120. Specifically, in this embodiment, there are four first shielding portions 120, namely, first shielding portions 121, 122, 123, and 124. The first shielding portions 121, 122, 123, and 124 are located at the ends and intervals of the first through holes 111, 112, and 113. Specifically, in this embodiment, the first shielding portions 121 and 122 are located on both sides of the first through hole 111, the first shielding portions 122 and 123 are located on both sides of the first through hole 112, and the first shielding portions 123 and 124 are located on both sides of the first through hole 113.

[0038] Specifically, in this embodiment, the second shielding layer 200 has a plurality of second through holes 210. For ease of understanding, this application takes three second through holes 210 as an example, namely second through holes 211, 212 and 213 arranged at intervals. The second shielding layer 200 includes a plurality of second shielding portions 220. Specifically, in this embodiment, the number of second shielding portions 220 is four, namely second shielding portions 221, 222, 223 and 224. The second shielding portions 221, 222, 223 and 224 are located at the ends and intervals of the second through holes 211, 212 and 213. Specifically, in this embodiment, the second shielding portions 221 and 222 are located on both sides of the second through hole 211, the second shielding portions 222 and 223 are located on both sides of the second through hole 212, and the second shielding portions 223 and 224 are located on both sides of the second through hole 213.

[0039] In this embodiment of the application, the number of condensing lenses 300 is also three, namely condensing lenses 310, 320 and 330.

[0040] In this embodiment, the condenser lens 310, the first through hole 111, and the second through hole 211 are correspondingly arranged; the condenser lens 320, the first through hole 112, and the second through hole 212 are correspondingly arranged; and the condenser lens 330, the first through hole 111, and the second through hole 211 are correspondingly arranged.

[0041] In this embodiment, the photosensitive element 400 is used to receive light reflected from the fingerprint to read the fingerprint signal. Specifically, in this embodiment, there is one photosensitive element 400, which is disposed corresponding to the second through holes 211, 212, and 213, and is used to receive light passing through the second through holes 211, 212, and 213. In other embodiments, such as Figure 2b As shown, the number of photosensitive elements 400 can also be three, namely photosensitive elements 410, 420 and 430. Photosensitive element 410 is correspondingly arranged with the second through hole 211, and is used to receive the light diffused by the fingerprint, which is then focused by the condenser lens 310 and passes through the first through hole 111 and the second through hole 211. Photosensitive element 420 is correspondingly arranged with the second through hole 212, and is used to receive the light diffused by the fingerprint, which is then focused by the condenser lens 320 and passes through the first through hole 112 and the second through hole 212. Photosensitive element 430 is correspondingly arranged with the second through hole 213, and is used to receive the light diffused by the fingerprint, which is then focused by the condenser lens 330 and passes through the first through hole 113 and the second through hole 213.

[0042] In this embodiment, the diffusely reflected light from the fingerprint includes light perpendicular to the incident focusing lens 330, which is then converged and passes through the first through-hole 113. The diffusely reflected light includes small-to-medium angle light incident obliquely into the focusing lens 330. This small-to-medium angle light reaches the first blocking portions 123 and 124, causing them to block the small-angle light. Large-angle light incident obliquely into the focusing lens 330, partially converged by the lens, reaches the first through-hole 112 and passes through it, forming interfering light. Another portion of the large-angle light converged by the focusing lens 330 reaches the first blocking portions 122 and 123, which filter out this additional portion of the large-angle light converged by the lens 330. In this embodiment, the large-angle light rays converged by the condenser lens 330 through the first through-hole 112 reach the second blocking portion 222 of the second blocking layer 200, where the second blocking portion 222 blocks the interfering light rays. This prevents the interfering light rays from reaching the photosensitive element 400 through the second through-hole 210. This embodiment reduces the amount of large-angle oblique light rays from adjacent condenser lenses reaching the photosensitive element 400, thereby reducing the impact of interfering light rays on the signal-to-noise ratio. In other embodiments, after the large-angle light rays are converged by the condenser lens 330, they may further reach the second blocking portion 221 of the second blocking layer 200 through the first through-hole 111. The second blocking portion 221 can block the large-angle oblique light rays from the nearby third lens 330 from reaching the photosensitive element 400. The fingerprint module of this application embodiment can reduce or avoid oblique light rays at small and medium angles, as well as large angles from adjacent and nearby focusing lenses, reaching the photosensitive element 400, so that vertically incident light rays reach the photosensitive element 400, thereby improving the signal-to-noise ratio of the fingerprint signal read by the photosensitive element 400.

[0043] In one embodiment of this application, the first through-hole 110 is disposed within the focal length range of the condenser lens 300, and the second through-hole 210 is disposed outside the focal length range of the condenser lens 300. In this embodiment, utilizing the characteristic that light converges at different angles of the focal plane, the first blocking layer 100 can block incident light rays at small and medium angles, allowing the target light rays to converge through the condenser lens 300 and then pass through the first through-hole 110. The second blocking layer 200 can block large-angle light rays converged by adjacent condenser lenses, allowing light rays passing through the first through-hole 110 to pass through the second through-hole 210, achieving a full-angle blocking effect except for the signal viewing angle.

[0044] In another embodiment of this application, both the first through-hole 110 and the second through-hole 210 are disposed within the focal length range of the condenser lens 300, and the defocus distance of the first through-hole 110 is greater than that of the second through-hole 210. This allows the light converged by the condenser lens 300 to pass through the first through-hole 110 and further through the second through-hole 210 to reach the photosensitive element 400. In this embodiment of the application, by utilizing the characteristic that the light convergence point is different at different angles of the focal plane, the first blocking layer 100 can also block light rays incident at small and medium angles, and allow the target light rays to be converged by the condenser lens 300 and then pass through the first through-hole 110; the second blocking layer 200 can block large-angle light rays converged by adjacent condenser lenses, and allow the light rays passing through the first through-hole 110 to pass through the second through-hole 210, achieving the effect of full-angle blocking except for the signal viewing angle.

[0045] In another embodiment of this application, both the first through-hole 110 and the second through-hole 210 are located outside the focal length range of the condenser lens 300, and the defocus distance of the first through-hole 110 is smaller than that of the second through-hole 210. This allows the light converged by the condenser lens 300 to pass through the first through-hole 110 and further through the second through-hole 210 to reach the photosensitive element 400. In this embodiment, by utilizing the characteristic that the light convergence point is different at different angles of the focal plane, the first blocking layer 100 can also block light rays incident at small and medium angles, and allow the target light rays to be converged by the condenser lens 300 and then pass through the first through-hole 110; the second blocking layer 200 can block large-angle light rays converged by adjacent condenser lenses, and allow the light rays passing through the first through-hole 110 to pass through the second through-hole 210, achieving the effect of full-angle blocking except for the signal viewing angle.

[0046] In this embodiment, the first through-hole 110 and the second through-hole 210 are close to the focal plane of the condenser lens 300. Because the light convergence point differs at different angles of the focal plane, this ensures that the first shielding layer 100 can block incident light rays at small to medium angles, and the second shielding layer 200 can block large-angle light rays converged by adjacent or nearby condenser lenses 300. In this embodiment, by setting two shielding layers, the first through-hole 110 and / or the second through-hole 210 do not need to be located on the focal plane, thus reducing the process requirements for the first shielding layer 100 and the second shielding layer 200 during manufacturing and improving the yield rate of the fingerprint module.

[0047] In this embodiment, the ratio of the diameter d1 of the first through-hole 110 to the diameter d2 of the second through-hole 210 is the same as the ratio of the defocus distance h1 of the first through-hole 110 to the defocus distance h2 of the second through-hole 210. In this embodiment, by setting d1:d2 = h1:h2, the placement positions of the first shielding layer 100 and the second shielding layer 200, as well as the diameters of the first through-hole 110 and the second through-hole 210, can be defined to ensure that light passing through the first through-hole 110 can pass through the second through-hole 210 without causing light intensity loss. Simultaneously, the second shielding layer 200 can block large-angle incident light rays converged by adjacent condenser lenses 300 to the greatest extent possible, i.e., to block interfering light rays to the greatest extent.

[0048] In this embodiment, the diameter d1 of the first through-hole 110 is the sum of the diameter of the light spot formed on the first shielding layer 100 by the vertically incident light rays after passing through the condenser lens 300 and the process deviation compensation C. In this embodiment, the light spot diameter after the vertically incident light rays pass through the condenser lens 300 varies with the propagation distance as a function L(X), that is, when the propagation distance of the vertically incident light rays after passing through the condenser lens 300 is X, the light spot diameter after passing through the condenser lens 300 is L(X). Ideally, when X = f, the light spot diameter L(f) after passing through the condenser lens 300 reaches its minimum, where f is the focal length of the condenser lens. In this embodiment, the diameter d1 of the first through-hole 110 is determined by L(X), and the distance between the first through-hole 110 and the condenser lens 300 is X = f - h1. That is, L(X) = L(f - h1). In this embodiment, d1 = L(f-h1) + C, where d1 is the diameter of the first through-hole 110, f is the focal length of the condenser lens 300, h1 is the distance from the first through-hole 110 to the focal point, and C is the process deviation compensation. In this embodiment, the process deviation compensation compensates for deviations caused by the manufacturing process. For example, process deviations include deviations in the manufacturing process of the first through-hole 110, or deviations between the first through-hole 110 and the condenser lens 300. In this embodiment, by compensating for process deviations, the diameter d1 of the first through-hole 110 is appropriately enlarged to avoid losses caused by process fluctuations, ensuring that target light rays such as 0° light can all pass through the first through-hole 110, thus avoiding light intensity loss for target light rays such as 0° light.

[0049] In this embodiment, by using d1:d2 = h1:h2 and d1 = L(f-h1) + C, we can obtain d2 = hh12[L(f-h1) + C]. Therefore, in this embodiment, given the positions of the first shielding layer 100 and the second shielding layer 200, and given that h1 and h2 are determined, the diameters of the first through hole 110 and the second through hole 210 can be determined.

[0050] like Figure 1 and Figure 2a As shown in the embodiment of this application, the first shielding layer 100 and the second shielding layer 200 are arranged parallel to each other; the line connecting the centers of the first through hole 110 and the second through hole 210 is perpendicular to the first shielding layer 100 or the second shielding layer 200. In this embodiment of this application, a plurality of first through holes 110 on the first shielding layer 100 are spaced apart, and a plurality of second through holes 210 on the second shielding layer 200 are spaced apart. The first shielding layer 100 and the second shielding layer 200 are arranged parallel to each other, such that the line connecting the centers of the first through holes 110 and the second through holes 210 is perpendicular to the first shielding layer 100 and / or the second shielding layer 200, so that the fingerprint module of this embodiment of this application can allow light incident at 0° to the condenser lens 300 to reach the photosensitive element 400 through the first through holes 110 and 210. In this embodiment of this application, the plane on which the plurality of condenser lenses 300 are located is also parallel to the first shielding layer 100 and the second shielding layer 200.

[0051] In this embodiment, the photosensitive element 400 is positioned directly below the second through-hole 210, meaning the photosensitive element 400 is located on the side of the second through-hole 210 facing away from the first shielding layer 100. In this embodiment, the projection of the photosensitive element 400 onto the second shielding layer 200 covers the second through-hole 210, allowing the photosensitive element 400 to completely collect the light passing through the second through-hole 210. In this embodiment, the photosensitive element 400 and the second through-hole 210 are arranged in a one-to-one correspondence, with the photosensitive element 400 adjacent to the second shielding layer 200. In other embodiments, there may be a certain distance between the photosensitive element 400 and the second shielding layer 200, i.e., the distance between the photosensitive element 400 and the second shielding layer 200 is less than or equal to a preset range, for example, less than or equal to 3 micrometers, to ensure that the photosensitive element 400 can effectively collect all the light passing through the second through-hole 210.

[0052] In this embodiment, the material of the first shielding layer 100 and / or the second shielding layer 200 includes black organic adhesive, and the first through-hole 110 and the second through-hole 210 are etched holes. In this embodiment, both the first shielding layer 100 and the second shielding layer 200 are black organic adhesive, which can achieve the function of blocking light. In other embodiments, the first shielding layer 100 or the second shielding layer 200 may also be made of black organic adhesive, and the materials of the first shielding layer 100 and the second shielding layer 200 may be the same or different. In this embodiment, both the first through-hole 110 and the second through-hole 210 are etched holes. In this embodiment, the first through-hole 110 and the second through-hole 210 can be fabricated through exposure and etching processes. The diameter and position of the first through-hole 110 and the second through-hole 210 can be specifically set, ensuring accurate alignment of the formed first through-hole 110 and the second through-hole 210, improving alignment accuracy, increasing the imaging uniformity of the photosensitive element 400, eliminating moiré patterns, and improving light intensity utilization efficiency, etc.

[0053] In this embodiment, the fingerprint module further includes a plurality of focusing lenses 300. The focusing lenses 300 are disposed on the side of the first shielding layer 100 opposite to the second shielding layer 200, and are correspondingly disposed with the first through-hole 110. In this embodiment, the focusing lenses 300 are part of the fingerprint module, allowing the fingerprint module to be directly assembled with other products. In this embodiment, the plurality of focusing lenses 300 are spaced apart, and adjacent two focusing lenses 300 are connected as a single unit, forming a focusing lens layer. This facilitates the alignment and assembly of the focusing lenses 300 with the first shielding layer 100 and the second shielding layer 200.

[0054] In this embodiment, the projection of the condenser lens 300 onto the first shielding layer 100 covers the first through hole 110, so that the light rays perpendicularly incident on the condenser lens 300 converge and pass through the first through hole 110, thereby reducing the light intensity loss of the target light rays.

[0055] like Figure 3As shown, in one embodiment of this application, the fingerprint module further includes a first functional layer 510 and a second functional layer 520. The first functional layer 510 is disposed between the condenser lens 300 and the first shielding layer 100, and the second functional layer 520 is disposed between the first shielding layer 100 and the second shielding layer 200. In one embodiment of this application, the fingerprint module further includes a third functional layer 530, which is disposed between the second shielding layer 200 and the photosensitive element 400. By providing the first functional layer 510, the second functional layer 520, and the third functional layer 530, the light loss during light propagation in this embodiment can be reduced, thereby reducing the light intensity loss of the target light of the fingerprint module. In other embodiments, the third functional layer 530 may be omitted, and the photosensitive element 400 may be directly attached to the side of the second shielding layer 200 away from the first shielding layer 100. In this embodiment, the first functional layer 510, the second functional layer 520, and the third functional layer 530 have a light-transmitting layer structure and can bond adjacent structural layers. In this embodiment, the first functional layer 510, the second functional layer 520, and the third functional layer 530 are light-transmitting adhesive layers to facilitate bonding the focusing lens 300 to the first shielding layer 100, the second shielding layer 200 to the first shielding layer 100, and the photosensitive element 400 to the second shielding layer 200, thereby integrating the fingerprint module into one unit. In this embodiment, the first functional layer 510, the second functional layer 520, and the third functional layer 530 are made of OCA optical adhesive. In other embodiments, the materials of the first functional layer 510, the second functional layer 520, and the third functional layer 530 may be different or other materials. This embodiment does not specifically limit the specific materials of the first functional layer 510, the second functional layer 520, and the third functional layer 530. The first functional layer 510, the second functional layer 520, and the third functional layer 530 may also be multilayer structures.

[0056] For ease of understanding, this application provides a specific embodiment, such as... Figure 1As shown, the condenser lens 300 has a height of 5 μm, a diameter of 13 μm, and a focal length f of 27 μm. In this embodiment, the condenser lens 300 allows light rays within a 13 μm diameter area to enter and converge. In this embodiment, the thickness M1 of the first shielding layer 100 is 1 μm, the diameter d1 of the first through-hole 110 is 7 μm, with a process deviation compensation of 0.8 μm. The distance M2 between the surface (upper surface) of the first shielding layer 100 near the condenser lens 300 and the condenser lens 300 is 13 μm. The thickness M3 of the second shielding layer 200 is 1 μm, the distance M4 between the upper surface of the second shielding layer 200 and the lower surface of the first shielding layer 100 is 25 μm, and the diameter d2 of the second through-hole 210 is 5 μm. In this embodiment, the first through-hole 110 is located within the focal length range of the condenser lens 300, and the second through-hole 210 is located outside the focal length range of the condenser lens 300. In this embodiment, d1 = 7 μm, d2 = 5 μm, h1 is the distance from the upper surface of the first shielding layer 100 to the focal point, and h2 is the distance from the focal point to the lower surface of the second shielding layer 200, i.e., h1 = f - M2 = 27 μm - 13 μm = 14 μm, h2 = M2 + M1 + M4 + M3 - f = 10 μm + 1 μm + 25 μm + 1 μm - 27 μm = 10 μm.

[0057] In this embodiment, a brightness simulation test is performed on the fingerprint module of the above specific embodiment, such as... Figure 4 As shown, the brightness percentage of incident light at different angles in the fingerprint module is 100% for 0° incident light, indicating that the fingerprint module in this embodiment of the application has no light intensity loss for 0° incident light. In this embodiment, the brightness percentage of 4° incident light is 62%, and the brightness percentage of 5° incident light is 18%. As the angle of incident light increases, the brightness percentage of the light intensity received by the photosensitive element 400 decreases sharply; when the incident angle of incident light increases to 6°, the brightness percentage of the light intensity received by the photosensitive element 400 is zero, indicating that the 6° incident light is blocked by the first blocking layer 100 and the second blocking layer 200. When the incident angle of the incident light is greater than 6°, the light intensity percentage of the light received by the photosensitive element 400 is zero. This indicates that the incident light with an angle greater than 6° in this embodiment is blocked by the first shielding layer 100 and the second shielding layer 200 and cannot reach the photosensitive element 400. This allows the vertically incident light or near-vertically incident light in this embodiment to reach the photosensitive element 400, thereby improving the signal-to-noise ratio of the fingerprint module and improving the imaging quality.

[0058] For ease of understanding, this application provides another specific embodiment, such as... Figure 5As shown, the condenser lens 300 has a height of 5 μm, a diameter of 16 μm, and a focal length f of 41 μm. In this embodiment, the condenser lens 300 allows light rays within a 16 μm diameter area to enter and converge. In this embodiment, the thickness M1 of the first shielding layer 100 is 1 μm, the diameter d1 of the first through-hole 110 is 7 μm, the process deviation compensation C is 0.8 μm, and the distance M2 between the surface of the first shielding layer 100 closest to the condenser lens 300 and the condenser lens 300 is 20 μm. The thickness M3 of the second shielding layer 200 is 1 μm, the distance M4 between the second shielding layer 200 and the first shielding layer 100 is 15 μm, and the diameter d2 of the second through-hole 210 is 5 μm. In this embodiment, the first through-hole 110 and the second through-hole 210 are located within the focal length range of the condenser lens 300, and the defocus distance of the first through-hole 110 is greater than that of the second through-hole 210. In this embodiment, d1 = 7 μm, d2 = 5 μm, h1 is the distance from the upper surface of the first shielding layer 100 to the focal point, h2 is the distance from the upper surface of the second shielding layer 200 to the focal point, h1 = f - M2 = 41 μm - 20 μm = 21 μm, h2 = f - M2 - M1 - M4 = 41 μm - 1 μm - 15 μm - 10 μm = 15 μm.

[0059] This application also includes a second technical solution, such as Figure 6 As shown, an electronic device includes a display panel 600 and the aforementioned fingerprint module, which is disposed on the back of the display panel 600. In this embodiment, the fingerprint module, disposed on the back of the display panel 600, allows light emitted from the display panel 600 to reach the fingerprint, causing diffuse reflection. The varying heights of the fingerprint ridges result in different intensities of light reflected vertically to the display panel 600, which are then converged by a condenser lens 300. A first shielding layer 100 blocks target light rays, such as 0° incident light, through a first through-hole 110, and a second shielding layer 200 blocks large-angle incident light rays passing through adjacent or nearby condenser lenses 300. In this embodiment, the fingerprint module can block non-target light rays at all angles, allowing target light rays to reach the photosensitive element 400. The intensity of the light reflected from the fingerprint can be converted into voltage or current signals to form a fingerprint image or identify the fingerprint. This embodiment improves the signal-to-noise ratio of fingerprint recognition, resulting in better image quality and easier identification.

[0060] Specifically, in one embodiment of this application, the condenser lens 300 is close to the back of the display panel, and the photosensitive element 400 is located on the side of the condenser lens 300 away from the display panel 600.

[0061] In the embodiments of this application, such as Figure 7a and Figure 7b As shown, the display panel 600 includes an array substrate 610, a pixel definition layer 620, light-emitting units 630, and an encapsulation layer 640. The pixel definition layer 620 is disposed on the array substrate 610, and a plurality of pixel openings 621 are formed on the pixel definition layer 620. The light-emitting units 630 are disposed in the pixel openings 621, and the encapsulation layer 640 covers the light-emitting units 630. The array substrate 610 includes a substrate and a pixel circuit array; the light-emitting unit 630 includes an anode layer 632 (see...). Figure 9 Organic light-emitting layer 631 (see) Figure 9 The light-emitting unit 630 includes a cathode layer (not shown), etc.; the encapsulation layer 640 includes an inorganic thin film encapsulation layer and an organic thin film encapsulation layer stacked together. This application does not limit the specific structure or materials of the light-emitting unit 630, and can be configured according to the display method of the display panel 600.

[0062] In one specific embodiment of this application, the pixel definition layer 620 includes a plurality of spaced-apart pixel openings 621 and dams 622. In one embodiment of this application, the projection of the condenser lens 300 onto the pixel definition layer 620 does not overlap with the pixel openings 621. That is, the projection of the condenser lens 300 onto the pixel definition layer 620 is located within the dams 622.

[0063] When a finger touches the light-emitting surface of the display panel 600, the light-emitting unit 630 of the display panel 600 emits light, which reaches the finger. After diffuse reflection, the light passes through the dam 622 of the pixel definition layer 620 and reaches the condenser lens 300. After being converged by the condenser lens 300, the light reaches the first through-hole 110. The first shielding layer 100 blocks at least part of the noisy light. The light passing through the first through-hole 110 can reach the second through-hole 210 and then reach the photosensitive element 400. The second shielding layer 200 can block large-angle light passing through adjacent or nearby condenser lenses 300. The electronic device of this application embodiment can realize under-display fingerprint recognition, improve the signal-to-noise ratio of under-display fingerprint recognition, and improve image quality.

[0064] In another specific embodiment of this application, such as Figure 8 As shown, the focusing lens 300 is disposed on the side of the encapsulation layer 640 away from the pixel definition layer 620, and the projection of the focusing lens 300 on the pixel definition layer 620 does not overlap with the pixel opening 621. The first shielding layer 100, the second shielding layer 200, and the photosensitive element 400 are disposed on the side of the array substrate 610 away from the encapsulation layer 640. In this embodiment, the first shielding layer 100 has a first through-hole 110, and the second shielding layer 200 has a second through-hole 210. The projections of the first through-hole 110 and the second through-hole 210 on the pixel definition layer 620 are both located within the dam 622. The electronic device in this embodiment can also realize under-display fingerprint recognition.

[0065] In another specific embodiment of this application, such as Figure 9 As shown, the fingerprint module is disposed in the display panel 600. Specifically, in this embodiment, the display panel 600 includes an array substrate 610, a pixel definition layer 620, an encapsulation layer 640, a polarizer 650, a planarization layer 660, and a cover plate 670 arranged sequentially, as well as a light-emitting unit 630. The light-emitting unit 630 includes an anode layer 632, an organic light-emitting layer 631, and a cathode layer, etc. In this embodiment, the pixel definition layer 620 is made of black opaque material, and the pixel definition layer 620 can serve as the first shielding layer 100 of the fingerprint module (see...). Figure 8 The pixel definition layer 620 has a plurality of pixel openings 621 and a first through-hole 110. A dam 622 is formed between the first through-hole 110 and the pixel openings 621, between the pixel openings 621, and between the first through-holes 110. An organic light-emitting layer is disposed in the pixel openings 621. A second shielding layer is disposed between the anode layer 632 and the array substrate 610, or a second shielding layer 200 is disposed in the array substrate 610. The second shielding layer 200 has a second through-hole 210. A photosensitive element 400 is disposed on the side of the second shielding layer 200 away from the pixel definition layer 620, and the photosensitive element 400 is correspondingly disposed with the second through-hole 210. A condenser lens 300 is disposed on the side of the encapsulation layer 640 away from the array substrate 610. The projection of the condenser lens 300 on the pixel definition layer 620 covers the first through-hole 110, and the projection of the condenser lens 300 on the pixel definition layer 620 does not overlap with the pixel openings 621. In this embodiment, the projection of the condenser lens 300 onto the second shielding layer 200 covers the second through-hole 210. In this embodiment, the encapsulation layer 640 has several light-shielding portions 680 on the side facing away from the array substrate 610. The projection of the light-shielding portions 680 onto the pixel definition layer 620 is located in the dam 622, allowing the light-shielding portions 680 to prevent interference between the light-emitting units 630 of the display panel 600. Simultaneously, the light-shielding portions 680 can improve the interference caused by the light emitted by the light-emitting units 630 of the display panel 600 directly reaching the fingerprint module via the condenser lens 300 without undergoing fingerprint diffuse reflection. In this embodiment, the fingerprint module can also be disposed within the display panel 600, reducing the number of layers in the electronic device, simplifying manufacturing processes, reducing the thickness of the electronic device, and enabling under-display fingerprint recognition on the display panel 600, which is beneficial for the thinning and lightening of electronic devices. In the electronic device of this embodiment, the fingerprint module can accurately transmit target light in the desired direction, exhibiting strong selectivity and no light intensity loss, while also improving the signal-to-noise ratio of the fingerprint module and enhancing image quality.

[0066] The above are merely embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A fingerprint module, characterized in that, include A first shielding layer is provided with a plurality of first through holes, the first through holes being used to allow light rays focused by a condensing lens to pass through, the first shielding layer being disposed on one side of the condensing lens and used to block at least part of the noise light rays; A second shielding layer is disposed on the side of the first shielding layer away from the condenser lens. The second shielding layer has a plurality of second through holes. The first through holes, the second through holes and the condenser lens are arranged in a one-to-one correspondence, so that light passing through the first through hole passes through the second through hole. The second shielding layer is used to block interfering light. The interfering light includes large-angle light passing through adjacent or close condenser lenses. A photosensitive element is disposed on the side of the second shielding layer opposite to the first shielding layer, and the photosensitive element is used to collect light passing through the second through hole; The ratio of the diameter of the first through hole to the diameter of the second through hole is the same as the ratio of the defocus distance of the first through hole to the defocus distance of the second through hole.

2. The fingerprint module according to claim 1, characterized in that, The first through-hole is located within the focal length range of the condenser lens, and the second through-hole is located outside the focal length range of the condenser lens; or Both the first through-hole and the second through-hole are located within the focal length range of the condenser lens, and the defocus distance of the first through-hole is greater than the defocus distance of the second through-hole; or Both the first through hole and the second through hole are located outside the focal length range of the condenser lens, and the defocus distance of the first through hole is smaller than the defocus distance of the second through hole.

3. The fingerprint module according to claim 1, characterized in that the diameter of the first through hole is the sum of the diameter of the light spot formed on the first shielding layer by the vertically incident light passing through the focusing lens and the process deviation compensation.

4. The fingerprint module according to claim 1, characterized in that the first shielding layer and the second shielding layer are arranged in parallel; the line connecting the center of the first through hole and the second through hole is perpendicular to the first shielding layer and / or the second shielding layer.

5. The fingerprint module according to claim 1, wherein the noise light includes oblique light.

6. The fingerprint module according to claim 1, characterized in that the material of the first shielding layer and / or the second shielding layer includes black organic adhesive, and the first through hole and the second through hole are etched holes.

7. The fingerprint module according to claim 1, characterized in that, It also includes several focusing lenses, which are disposed on the side of the first shielding layer away from the second shielding layer, and the focusing lenses are disposed corresponding to the first through hole.

8. The fingerprint module according to claim 1, characterized in that, The projection of the focusing lens onto the first shielding layer covers the first through hole.

9. An electronic device, characterized in that, The device includes a display panel and a fingerprint module as described in any one of claims 1-8, wherein the fingerprint module is disposed on the back of the display panel or the fingerprint module is disposed in the display panel.

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