A fingerprint recognition module

Abstract

The present invention discloses a fingerprint recognition module for LCD screen fingerprint recognition, which includes an LCD display module and an optical sensor element to transmit and / or receive biometric fingerprint optical signals; wherein the LCD display module includes an LCD display screen, a light source, a light guide plate arranged on one side of the light source, a reflective plate arranged below the light guide plate, a diffuser arranged above the light guide plate, and a brightness enhancement film arranged above the diffuser; the surface of the brightness enhancement film is provided with a plurality of lens structures and a plurality of platform structures; the platform structure includes a platform portion; and the platform structure is arranged between the plurality of lens structures and / or above the plurality of lens structures, so that external light substantially vertically penetrates the plane of the brightness enhancement film. The fingerprint recognition module enables the LCD module to effectively penetrate and accurately collect fingerprint recognition signals on the LCD module, thereby realizing the recognition of the fingerprint recognition function in the screen of the LCD display device.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a fingerprint recognition module for fingerprint recognition in an LCD screen. Background Art

[0002] Fingerprint sensing and matching is a reliable and widely used technology. Common methods of fingerprint recognition involve scanning a sample fingerprint or its image and storing the image and / or unique features of the fingerprint image, which can be compared with the information of reference fingerprints already in a database to determine the correct identification of the user, such as for verification purposes. In particular, in-display fingerprint recognition is becoming increasingly popular due to its ease of operation and versatility, as well as its suitability for compact portable electronic devices.

[0003] At present, the in-screen fingerprint recognition display devices mainly use OLED displays, mainly because OLED displays are thinner, lighter and easier to integrate fingerprint recognition sensors. However, liquid crystal displays (LCDs) have more cost advantages than OLEDs. The solution for existing LCD in-screen fingerprint recognition display devices is to use CMOS image sensors (Complementary Metal Oxide Semiconductor) under the LCD screen (under display). The CMOS image sensor is not completely built into the display, but fingerprint sensing can be achieved within the active area of ​​the display by sacrificing some thickness. However, in-screen fingerprint recognition display devices based on LCD displays are not yet fully mature, especially they cannot take into account the effective penetration and accurate collection of fingerprint recognition signals on the LCD module.

[0004] In LCD display screen fingerprint recognition display devices, such as Figure 1 As shown, the fingerprint is identified by pressing on the glass cover plate 140 covering the LCD display screen; however, the optical signal used to identify the fingerprint must at least pass through the LCD display screen and the glass cover plate 140, and because the LCD display screen is composed of an LCD module 130 and a backlight module 120, and the glass cover plate has a certain thickness. Therefore, the optical signal will be severely refracted and scattered, or even totally reflected, in the process of passing through the LCD module, the backlight module and the glass cover plate. In particular, the feedback optical signal carrying the biometric fingerprint information is seriously affected by multiple functional optical films in the backlight module, such as the refraction, scattering and reflection of the feedback optical signal by the brightening film, the diffuser, the reflector, etc., resulting in the loss of the feedback optical signal or serious optical noise pollution, resulting in the optical sensor 110 under the LCD screen failing to collect effective and accurate signals, and thus failing to identify the biometric fingerprint information.

[0005] The optical film that has the greatest impact on the accurate collection of optical signals in the backlight module is the brightness enhancement film. In the prior art, the brightness enhancement film is arranged in the backlight module of the LCD to improve the luminous efficiency. Figure 2 is a diagram of a conventional brightness enhancement film. Figure 2 As shown, the brightness enhancement film 310 includes a main body portion 320 and a plurality of lens structures 330. The lens structures 330 are isosceles right-angled triangular prisms and are repeatedly formed in the main body portion 320 and arranged in an array. Figure 3 It is shown Figure 2 The relationship between the viewing angle and brightness of the brightness enhancement film is shown in the graph. Figure 3 As shown, the abscissa represents the light output angle after the light passes through the traditional brightness enhancement film, and the ordinate represents the brightness of the light. Figure 3 The thick line in the figure shows the vertical relationship between the viewing angle and the brightness of the traditional brightness enhancement film, while the thin line shows the horizontal relationship between the viewing angle and the brightness of the traditional brightness enhancement film. Therefore, the traditional brightness enhancement film has the function of light gathering. However, the optical signal used to collect biometric fingerprint information will also be gathered and non-directionally scattered when passing through the traditional brightness enhancement film, resulting in loss of target feedback light signal or serious optical noise pollution.

[0006] Therefore, the realization of the in-screen fingerprint recognition function of the LCD display requires improvements to the overall design of the fingerprint recognition module, especially the optical structure design of the brightness enhancement film and the adjustment of other optical films designed to match it. Summary of the invention

[0007] The main technical problem solved by the present invention is to provide a backlight module and an LCD module for fingerprint recognition in an LCD screen, which can enable the fingerprint recognition signal to effectively penetrate and accurately collect on the LCD module.

[0008] In order to solve the above technical problems, a technical solution adopted by the present invention is: a fingerprint recognition module, which includes an LCD display module and an optical sensor element to emit and / or receive biological fingerprint optical signals; wherein the LCD display module includes an LCD display screen, a light source, a light guide plate arranged on one side of the light source, a reflective plate arranged below the light guide plate, a diffuser arranged above the light guide plate, and a brightness enhancement film arranged above the diffuser; wherein the surface of the brightness enhancement film is provided with a plurality of lens structures and a plurality of platform structures; the platform structure includes a platform portion; the platform structure is arranged between the plurality of lens structures and / or above the plurality of lens structures, so that external light passes through the plane of the brightness enhancement film basically vertically.

[0009] Here, substantially vertical transmission means that the angle between the optical signal passing through the platform structure and the plane of the brightness enhancement film is within the range of 90±15°. Here, the platform structure adjusts the incident or emitted optical signal to be parallel light substantially perpendicular to the plane of the brightness enhancement film. The setting of the platform structure solves the problem of total reflection and non-directional scattering of light in the lens structure of the traditional brightness enhancement film.

[0010] The fingerprint recognition module of the present invention is used to accurately transmit the outgoing optical signal of the detection to the detected object for detection. On the other hand, the feedback optical signal of the detection object can be almost losslessly transmitted through the brightness enhancement film and the backlight module, and accurately and effectively collected by the optical sensor under the LCD screen, thereby realizing the fingerprint recognition function of the LCD display. The platform structure is continuously or discontinuously arranged between multiple lens structures and / or on multiple lens structures.

[0011] Preferably, the brightness enhancement film comprises a first polymer layer and a second polymer layer. The first polymer layer has a microstructured surface, and the lens structure and the platform structure are arranged on the microstructured surface; the lens structure and the platform structure are arranged in an array on the microstructured surface.

[0012] The second polymer layer is located between the first polymer layer and the diffuser and is disposed adjacent to the first polymer layer. The microstructured surface of the first polymer layer is disposed parallel to the light guide plate or the reflector, so that the light from the backlight source and the fingerprint recognition optical signal can fully penetrate.

[0013] The first polymer layer and the second polymer layer also have the function of absorbing ultraviolet light. The ultraviolet absorber filled in the first polymer layer and the second polymer layer can reduce the degradation of LCD and polymer optical film due to ultraviolet radiation.

[0014] Preferably, the angle between the plane of the platform portion and the plane of the microstructured surface is less than 10°.

[0015] Preferably, the width of the platform portion is less than 1 / 2 of the minimum distance between adjacent lens structures.

[0016] Preferably, the refractive index of the platform structure is substantially equal to the refractive index of the first polymer layer.

[0017] Preferably, the refractive index of the platform structure is smaller than the refractive index of the first polymer layer.

[0018] Preferably, the lens structure and the platform structure are also arranged on the second polymer layer.

[0019] Preferably, the orientation of the lens structures on the microstructured surface of the first polymer layer is different from the orientation of the lens structures on the second polymer layer. Further, the orientation of the lens structures on the microstructured surface of the first polymer layer is substantially perpendicular to the orientation of the lens structures on the second polymer layer.

[0020] Preferably, the lens structures on the microstructured surface of the first polymer layer and the lens structures on the second polymer layer each include a plurality of triangular prisms or rounded triangular prisms with rounded vertices.

[0021] Preferably, the optical sensor element transmits and / or receives the biometric fingerprint optical signal as infrared light or ultraviolet light.

[0022] Preferably, the optical sensor element is disposed between the light guide plate and the reflective sheet.

[0023] Preferably, the optical sensor element is arranged below the reflective sheet.

[0024] Preferably, the optical sensor element is embedded inside the reflective sheet.

[0025] Preferably, the optical sensor element is disposed above the brightness enhancement film.

[0026] According to the embodiment of the present invention, the fingerprint recognition module of the present invention can be applied to LCD displays and electronic devices for fingerprint recognition. The fingerprint recognition module of the present invention is applied to electronic devices for fingerprint recognition to realize accurate recognition and verification of biometric fingerprint information. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The invention and its advantages will be better understood by studying the detailed description of particular embodiments given by way of non-limiting examples and illustrated in the accompanying drawings, in which:

[0028] Figure 1 It is an in-screen fingerprint recognition display device of an LCD display in the prior art.

[0029] Figure 2 is a diagram of a brightness enhancement film in the prior art.

[0030] Figure 3 It is a curve diagram showing the relationship between viewing angle and brightness of a brightness enhancement film in the prior art.

[0031] Figure 4 is a schematic diagram of a backlight module according to a preferred embodiment of the present invention.

[0032] Figure 5 1 is a cross-sectional view of the brightness enhancement film according to Example 1 of the present invention.

[0033] Figure 6 4 is a diagram showing the cross-sectional structure of the brightness enhancement film according to Example 7 of the present invention.

[0034] Figure 7 The present invention Figure 5 A cross-sectional view of the light traveling direction in the platform structure is shown.

[0035] Figure 8 1 is a cross-sectional structural diagram of the first polymer layer and the second polymer layer of the brightness enhancement film of Example 1 of the present invention.

[0036] Fig. 9 1 is a cross-sectional structural diagram of the first polymer layer and the second polymer layer of the brightness enhancement film of Example 2 of the present invention.

[0037] Fig.10 1 is a cross-sectional structural diagram of the first polymer layer and the second polymer layer of the brightness enhancement film of Example 3 of the present invention.

[0038] Fig.11 1 is a cross-sectional structural diagram of the first polymer layer and the second polymer layer of the brightness enhancement film of Example 4 of the present invention.

[0039] Fig.12 It is a cross-sectional structural diagram of the first polymer layer of the brightness enhancement film of the fingerprint recognition module of Example 5 of the present invention.

[0040] Fig.13 It is a cross-sectional structural diagram of the first polymer layer of the brightness enhancement film of the fingerprint recognition module of Example 6 of the present invention.

[0041] Fig.14 1 is a cross-sectional view of the first polymer layer of the brightness enhancement film of the fingerprint recognition module according to Example 8 of the present invention.

[0042] Fig.15 It is a cross-sectional structural diagram of the first polymer layer of the brightness enhancement film of the fingerprint recognition module of Example 9 of the present invention.

[0043] Fig.16 It is a plan view showing the structure of a diffusion membrane according to the fifth embodiment of the present invention.

[0044] Fig.17 It is a plan view showing the structure of the diffusion film according to the sixth embodiment of the present invention.

[0045] Fig.18 Schematic diagram of a backlight module of a fingerprint recognition module according to embodiment 10 of the present invention.

[0046] Fig.19 Schematic diagram of a backlight module of a fingerprint recognition module according to embodiment 11 of the present invention. DETAILED DESCRIPTION

[0047] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0048] Example 1

[0049] First, through Figure 1 , Figure 4 , Figure 5 , Figure 7 , the fingerprint recognition module of the embodiment 1 of the present invention is described. According to the fingerprint recognition module of the embodiment 1 of the present invention, the fingerprint recognition module includes a glass cover plate 140, an LCD display module 130 and an optical sensor element 110 from top to bottom. The LCD display module includes an LCD display screen, a light source 221 and a light guide plate 220 arranged on one side of the light source 221, a reflective sheet 210 arranged below the light guide plate 220, a diffuser 230 arranged on the upper side of the light guide plate 220, and a brightness enhancement film 240 arranged on the upper side of the diffuser; wherein, a plurality of lens structures 2402 and a plurality of platform structures 2403 are arranged on the surface of the substrate 2401 of the brightness enhancement film 240; the platform structure includes a platform portion 24031; the platform structure is arranged between the plurality of lens structures 2402, so that the external light is substantially vertically incident and substantially vertically emitted through the plane of the brightness enhancement film 240.

[0050] Here, if Figure 7 As shown, the platform structure 2403 adjusts the incident or emitted optical signal to be parallel light that is basically perpendicular to the plane of the brightness enhancement film 240. There are two main ways to emit through the platform part. On the one hand, the light that is not on the side of the platform structure 2403 directly passes through the platform part and emits L1; on the other hand, the optical signal is reflected by the side of the platform structure 2403, and then reflects again from the reflective sheet 210 and emits L2 from the platform part. Here, the optical signal reflected by the side of the platform structure 2403 can be emitted from the platform structure 2403, or from other platform structures adjacent to the platform structure. Therefore, the feedback light signal of the detection object can pass through the brightness enhancement film 240 and the backlight module almost losslessly. On the other hand, the emitted optical signal used for detection is accurately transmitted to the detected object for detection, and is accurately and effectively collected by the optical sensor under the LCD screen, thereby realizing the in-screen fingerprint recognition function of the LCD display.

[0051] The brightness enhancement film 240 includes a first polymer layer 310 and a second polymer layer 320. The first polymer layer 310 has a microstructured surface, and a lens structure 2402 and a platform structure 2403 are arranged on the microstructured surface; the lens structure 2402 and the platform structure 2403 are arranged in an array on the microstructured surface. The second polymer layer 320 is located between the first polymer layer 310 and the diffuser and is arranged adjacent to the first polymer layer 310. The microstructured surface of the first polymer layer 310 is arranged parallel to the light guide plate or the reflective sheet, so that the light from the backlight source and the fingerprint recognition optical signal can fully penetrate. The first polymer layer 310 and the second polymer layer 320 also have ultraviolet light absorption function, and the ultraviolet absorber filled in the first polymer layer 310 and the second polymer layer 320 can reduce the degradation of LCD and polymer optical film due to ultraviolet radiation.

[0052] The angle between the plane of the platform portion and the plane of the microstructured surface is 0°; the width of the platform portion is equal to 1 / 5 of the minimum distance between adjacent lens structures 2402. The refractive index of the platform structure 2403 is substantially equal to the refractive index of the first polymer layer 310, and the platform structure 2403 and the first polymer layer 310 can be made of the same optical material.

[0053] like Figure 8 As shown, the lens structure 2402 and the platform structure 2403 are also disposed on the second polymer layer 320. The platform structure 2403 on the first polymer corresponds to the platform structure 2403 on the second polymer layer 320. The platform structure 2403 protrudes out of the plane of the first polymer layer 310 or the second polymer layer 320 and has a trapezoidal cross section, which further improves the efficiency and accuracy of the light signal passing through the brightness enhancement film 240. The orientation of the lens structure 2402A on the microstructured surface of the first polymer layer 310 is substantially perpendicular to the orientation of the lens structure 2402B on the second polymer layer 320.

[0054] The lens structures 2402 on the microstructured surface of the first polymer layer 310 and the lens structures 2402 on the second polymer layer 320 each include a plurality of triangular prisms. The platform structures 2403 on the microstructured surface of the first polymer layer 310 are non-continuously arranged between the plurality of lens structures 2402. Here, the platform structures 2403 and the lens structures 2402 are arranged in an array arranged alternately.

[0055] Example 2

[0056] Please refer to Fig. 9 , is a cross-sectional structural diagram of the first polymer layer 310 and the second polymer layer 320 of the brightness enhancement film of the fingerprint recognition module of the second embodiment of the present invention. The following only describes the differences between the second embodiment and the first embodiment, and the similarities are not repeated here. Only the lens structure 2402 is provided on the second polymer layer 320 of the brightness enhancement film, and no platform structure 2403 is provided. At this time, the light can be focused and diverged by the lens structure 2402 to uniformize the light emitted by the first polymer layer 310, thereby avoiding the situation of uneven light emission (Mura).

[0057] Example 3

[0058] Please refer to Fig.10, is a cross-sectional structural diagram of the first polymer layer 310 and the second polymer layer 320 of the brightness enhancement film of the fingerprint recognition module of Example 3 of the present invention. The following only describes the differences between Example 3 and Example 1, and the similarities are not repeated here. The upper surface of the first polymer layer 310 of the brightness enhancement film is provided with a platform structure 2403A having a trapezoidal cross section, and the lower surface of the first polymer layer 310 is provided with a platform structure 2403B at a position opposite to the platform structure 2403A. Here, the platform structure 2403B and the first polymer layer 310 are made of the same material and are provided in the gap between the lens structure 2402 array.

[0059] The platform structure 2403C on the second polymer layer 320 is made of the same material as the second polymer layer 320 and is disposed in the gap between the lens structure arrays 2402. Here, the platform structure 2403B of the first polymer layer 310 corresponds to the platform structure 2403C on the second polymer layer 320.

[0060] Example 4

[0061] Please refer to Fig.11 , is a cross-sectional structural diagram of the first polymer layer 310 and the second polymer layer 320 of the brightness enhancement film of the fingerprint recognition module of Example 4 of the present invention. The following only describes the differences between Example 4 and Example 1, and the similarities are not repeated here. The upper and lower surfaces of the first polymer layer 310 of the brightness enhancement film are both provided with a platform structure 2403 with a trapezoidal cross section, and their positions are opposite. Here, the platform structure 2403 is made of a different material from the first polymer layer 310, and the refractive index of the platform structure 2403 is lower than the refractive index of the first polymer layer 310. The platform structure 2403 is provided in the gap between the lens structure 2402 array.

[0062] The platform structures 2403 on the second polymer layer 320 have a lower refractive index than the second polymer layer 320 and are disposed in the gaps between the lens structure arrays 2402. Here, the platform structures 2403 of the first polymer layer 310 correspond to the platform structures 2403 on the second polymer layer 320.

[0063] Example 5

[0064] Please refer to Fig.12, is a cross-sectional structural diagram of the first polymer layer 310 of the brightness enhancement film of the fingerprint recognition module of Example 5 of the present invention. The following only describes the differences between Example 5 and Example 1, and the similarities are not repeated here. A cubic platform structure 2403 is arranged on the upper surface of the first polymer layer 310 of the brightness enhancement film, and the positions thereof are opposite. Here, the platform structure 2403 is made of a different material from the first polymer layer 310, and the refractive index of the platform structure 2403 is lower than the refractive index of the first polymer layer 310, and the platform structure 2403 is arranged in the gap between the lens structure 2402 array.

[0065] Please refer to Fig.16 , is a planar structural diagram of the diffusion film 230 of Example 5 of the present invention. The diffusion units 2301 are distributed in stripes on the diffusion film 230. Therefore, the low haze area of ​​the diffusion film 230 has a diffusion effect. At the same time, the low haze area is light-transmissive and can also improve the brightness of the backlight module.

[0066] Example 6

[0067] Please refer to Fig.13 , is a cross-sectional structural diagram of the first polymer layer 310 of the brightness enhancement film of the backlight module of Example 6 of the present invention. The following only describes the differences between Example 5 and Example 1, and the similarities are not repeated here. The upper surface of the first polymer layer 310 of the brightness enhancement film is provided with a platform structure 2403 with an inverted trapezoidal cross section. The platform structure 2403 is provided on the lens structure 2402 and fills the gaps of the lens structure 2402 array. Here, the platform structure 2403 and the first polymer layer 310 are made of the same material.

[0068] Please refer to Fig.17 , is a planar structural diagram of a diffusion film 230 of Example 6 of the present invention, which is provided with a low haze region 2320, and the haze of the low haze region 2320 is lower than the haze of other regions 2320 of the diffusion sheet. Alternatively, the haze of the diffusion sheet increases radially from the low haze region 2320 to other parts. Therefore, the low haze region 2320 of the diffusion sheet 230 has a diffusion effect, and at the same time, the low haze region 2320 is light-transmissive, and can also improve the brightness of the backlight module.

[0069] Example 7

[0070] Please refer to Figure 6, is a cross-sectional structural diagram of the first polymer layer 310 of the brightness enhancement film of the fingerprint recognition module of Example 7 of the present invention. The following only describes the differences between Example 7 and Example 1, and the similarities are not repeated here. The upper surface of the first polymer layer 310 of the brightness enhancement film is continuously provided with a platform structure 2403 having a trapezoidal cross section. Here, the platform structure 2403 is different from the material of the substrate 2401 of the first polymer layer 310, and the refractive index of the platform structure 2403 is lower than the refractive index of the first polymer layer 310. The array of the platform structure 2403 is arranged in the gap between the array of lens structures 2402.

[0071] Example 8

[0072] Please refer to Fig.14 , is a cross-sectional structural diagram of the first polymer layer 310 of the brightness enhancement film of the fingerprint recognition module of Example 8 of the present invention. The following only describes the differences between Example 8 and Example 1, and the similarities are not repeated here. A platform structure 2403 with an inverted trapezoidal cross section is embedded on the upper surface of the first polymer layer 310 of the brightness enhancement film. Here, the platform structure 2403 is different from the material of the substrate 2401 of the first polymer layer 310, and the refractive index of the platform structure 2403 is equal to the refractive index of the first polymer layer 310. The array of the platform structure 2403 is arranged in the gap between the array of lens structures 2402.

[0073] Example 9

[0074] Please refer to Fig.15 , is a cross-sectional structural diagram of the first polymer layer 310 of the brightness enhancement film of the fingerprint recognition module of Example 9 of the present invention. The following only describes the differences between Example 9 and Example 1, and the similarities are not repeated here. A platform structure 2403 with a triangular cross section is embedded on the upper surface of the first polymer layer 310 of the brightness enhancement film. The platform structure 2403 can be a triangular cone or a tetrahedron. Here, the platform structure 2403 is different from the material of the substrate 2401 of the first polymer layer 310. The refractive index of the platform structure 2403 is equal to the refractive index of the first polymer layer 310. The platform structure 2403 is set in the gap between the lens structure 2402 array.

[0075] Example 10

[0076] Please refer to Fig.18 , is a schematic diagram of the backlight module structure of the fingerprint recognition module of Example 9 of the present invention. The following only describes the differences between Example 10 and Example 1, and the similarities are not repeated here. The optical sensor 110 is embedded in the reflective sheet 210, and the surface of the optical sensor 110 is coated with a visible light reflective coating, but can receive infrared light or ultraviolet light.

[0077] Embodiment 11

[0078] Please refer to Fig.19 , is a schematic diagram of the backlight module structure of the fingerprint recognition module of embodiment 10 of the present invention. The following only describes the differences between embodiment 11 and embodiment 1, and the similarities are not repeated here. The optical sensor 110 is arranged above the diffusion film 240. The optical sensor 110 is transparent to visible light, but can receive infrared light or ultraviolet light.

[0079] Although the present invention has been described above with reference to some embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the various embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A fingerprint recognition module, comprising: LCD display module and optical sensor element to transmit and / or receive biometric fingerprint optical signals; The LCD display module includes an LCD display screen, a light source, a light guide plate arranged on one side of the light source, a reflective sheet arranged below the light guide plate, a diffuser arranged above the light guide plate, and a brightness enhancement film arranged above the diffuser; The surface of the brightness enhancement film is provided with a plurality of lens structures and a plurality of platform structures; The platform structure comprises a platform portion; and The platform structure is disposed between the two lens structures so that external light passes substantially vertically through the plane of the brightness enhancement film; The brightness enhancement film comprises a first polymer layer and a second polymer layer; Wherein, the first polymer layer and the second polymer layer are arranged adjacent to each other; The first polymer layer has a microstructured surface, the lens structure and the platform structure are arranged on the microstructured surface, and the microstructured surface of the first polymer layer is arranged parallel to the light guide plate or the reflective sheet; The second polymer layer is located between the first polymer layer and the diffusion sheet; The lens structure and the platform structure are also arranged on the surface of the second polymer layer; The platform structure on the first polymer layer corresponds to the platform structure on the second polymer layer, and the orientation of the lens structure on the microstructured surface of the first polymer layer is substantially perpendicular to the orientation of the lens structure on the second polymer layer.

2. The fingerprint recognition module according to claim 1, characterized in that: The angle between the plane of the terrace portion and the plane of the microstructured surface is less than 10°.

3. The fingerprint recognition module according to claim 1, characterized in that: The width of the platform portion is less than 1 / 2 of the minimum distance between adjacent lens structures.

4. The fingerprint recognition module according to claim 1, characterized in that: The refractive index of the platform structure is substantially equal to the refractive index of the first polymer layer.

5. The fingerprint recognition module according to claim 1, characterized in that: The refractive index of the platform structure is smaller than the refractive index of the first polymer layer.

6. The fingerprint recognition module according to claim 1, characterized in that: The lens structure on the microstructured surface of the first polymer layer and the lens structure on the second polymer layer each include a plurality of triangular prisms or rounded triangular prisms with rounded vertices.

7. The fingerprint recognition module according to claim 1, characterized in that: The optical sensor element transmits and / or receives the biometric fingerprint optical signal as infrared light or ultraviolet light.

8. The fingerprint recognition module according to claim 1, characterized in that: The optical sensor element is arranged between the light guide plate and the reflective sheet.

9. The fingerprint recognition module according to claim 1, characterized in that: The optical sensor element is arranged below the reflective sheet.

10. The fingerprint recognition module according to claim 1, characterized in that: The optical sensor element is embedded in the reflective sheet.

11. The fingerprint recognition module according to claim 1, characterized in that: The optical sensor element is arranged above the brightness enhancement film.

12. An electronic device for fingerprint recognition, comprising: The fingerprint recognition module, glass cover plate, and photosensitive element described in any one of claims 1-11 are used to receive feedback optical signals transmitted through the LCD display module.

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