LED fingerprint identification equipment, manufacturing method and device

Abstract

The embodiment of the invention relates to the technical field of fingerprint identification, and discloses LED fingerprint identification equipment, a manufacturing method and a device, and the equipment comprises a fingerprint sensing array, a photoresist layer, a driving substrate and an LED light-emitting device. The driving substrate is arranged on the top surface of the fingerprint sensing array, the light resistance layer is arranged on the top surface of the driving substrate, and the LED light-emitting device is arranged in the light resistance layer, so that the periphery of the LED light-emitting device is wrapped by a light resistance material of the light resistance layer; and the light resistance layer is provided with a light-transmitting polarization maintaining optical fiber layer above the fingerprint sensing array in the vertical direction. By applying the technical scheme of the invention, noise light can be reduced, and the influence of the noise light on fingerprint reflection light can be reduced; through the light-permeable polarization-maintaining optical fiber layer, the fingerprint reflection light can directly pass through the polarization-maintaining optical fiber layer to be transmitted to the fingerprint sensing array; on the basis of reducing noise light, the recognition precision is improved, and the recognition error is reduced.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of fingerprint recognition, and in particular, to an LED fingerprint recognition device, a manufacturing method and a device thereof. Background Art

[0002] With the rapid development of electronic devices, more and more devices or apparatuses are transformed into electronic forms for automated control and human-computer interaction, facilitating users to call different devices. During use, the security of devices and personal information becomes increasingly important. Since fingerprints are unique and unchanging, integrating them into electronic devices can enhance the security and reliability of the devices.

[0003] In order to combine fingerprint recognition technology with a touch screen to enable users to directly call the touch screen for different manipulation requirements after fingerprint recognition, a commonly used device structure is as follows: a CMOS sensing array is arranged below the screen of a display (OLED or Micro LED) or between the display and an LED device. After using the light emitted by the LED for fingerprint imaging, the CMOS sensing array recognizes the fingerprint based on the collected fingerprint image.

[0004] However, the currently commonly used structure has the following technical problems: the light of the LED device itself and the light of the LED device scattered in other substances are both likely to be transmitted to the CMOS sensing array, causing the CMOS sensing array to be affected by various non-fingerprint imaging lights, thereby resulting in the distortion of fingerprint imaging and reducing the accuracy of fingerprint recognition. Summary of the Invention

[0005] In view of the above problems, the embodiments of the present invention provide an LED fingerprint recognition device, a manufacturing method and a device thereof, which are used to solve the technical problem that the prior art is likely to cause the distortion of fingerprint imaging and thus reduce the fingerprint recognition accuracy.

[0006] According to one aspect of the embodiments of the present invention, an LED fingerprint recognition device is provided. The LED fingerprint recognition device includes: a fingerprint sensing array, a photoresist layer, a driving substrate, and an LED light-emitting device;

[0007] The driving substrate is disposed on the top surface of the fingerprint sensing array, the photoresist layer is disposed on the top surface of the driving substrate, and the LED light-emitting device is disposed in the photoresist layer so that the photoresist material of the photoresist layer wraps around the periphery of the LED light-emitting device;

[0008] Above the fingerprint sensing array in the vertical direction of the photoresist layer, a polarization-maintaining optical fiber layer that can transmit light is provided. When the user's fingerprint reflects the light emitted by the LED light-emitting device and the reflected light is absorbed by the photoresist layer around the polarization-maintaining optical fiber layer, the reflected light is transmitted through the transmissive polarization-maintaining optical fiber layer to the fingerprint sensing array for identification.

[0009] In one embodiment, the present invention can drive the LED light-emitting device to emit light towards the user's fingerprint through the driving substrate. The light reflected by the user's fingerprint is absorbed by the photoresist layer around the polarization-maintaining optical fiber layer, so that the remaining unabsorbed light can be concentrated and transmitted through the transmissive polarization-maintaining optical fiber layer. The fingerprint sensing array disposed vertically below the polarization-maintaining optical fiber layer collects the light reflected by the fingerprint for fingerprint identification. Since the photoresist layer wraps the LED light-emitting device and can absorb light, it can reduce the light of the LED device itself and the scattered light of other substances, etc., to reduce the influence of the noise light on the light reflected by the fingerprint. Furthermore, the light reflected by the fingerprint can be transmitted through the transmissive polarization-maintaining optical fiber layer to the fingerprint sensing array, and the fingerprint sensing array can perform fingerprint identification according to the reflected light of the fingerprint to improve the identification accuracy.

[0010] According to one aspect of the embodiments of the present invention, a manufacturing method of an LED fingerprint identification device is provided, and the method includes:

[0011] Set a driving substrate on the fingerprint sensing array;

[0012] After setting the LED light-emitting device on the driving substrate, inject a black material around the LED light-emitting device by a coating method or an evaporation method to form a photoresist layer;

[0013] After photolithographing a photoresist via hole in the photoresist layer vertically above the fingerprint sensing array, construct the polarization-maintaining optical fiber layer in the photoresist via hole;

[0014] Set a protective glass on the top surface of the polarization-maintaining optical fiber layer.

[0015] According to another aspect of the embodiments of the present invention, a manufacturing device of an LED fingerprint identification device is provided, and the device includes:

[0016] A substrate module for setting a driving substrate on the fingerprint sensing array;

[0017] A photoresist module for injecting a black material around the LED light-emitting device by a coating method or an evaporation method to form a photoresist layer after setting the LED light-emitting device on the driving substrate;

[0018] A light module for constructing the polarization-maintaining optical fiber layer in the photoresist via hole after photolithographing a photoresist via hole in the photoresist layer vertically above the fingerprint sensing array;

[0019] A glass module is used to provide a protective glass on the top surface of the polarization-maintaining optical fiber layer.

[0020] According to another aspect of the embodiments of the present invention, there is provided a manufacturing device for an LED fingerprint recognition device, including: a processor, a memory, a communication interface, and a communication bus. The processor, the memory, and the communication interface complete mutual communication through the communication bus;

[0021] The memory is used to store at least one executable instruction, and the executable instruction enables the processor to perform the step content of the manufacturing method of the LED fingerprint recognition device provided in the above embodiments.

[0022] According to still another aspect of the embodiments of the present invention, there is provided a computer-readable storage medium, in which at least one executable instruction is stored, and the executable instruction enables a manufacturing device / device of an LED fingerprint recognition device to perform the following operations:

[0023] Set a driving substrate on the fingerprint sensing array;

[0024] After setting an LED light-emitting device on the driving substrate, inject a black material around the LED light-emitting device by a coating method or an evaporation method to form a photoresist layer;

[0025] After photolithographing a photoresist via hole in the photoresist layer directly above the fingerprint sensing array, construct the polarization-maintaining optical fiber layer in the photoresist via hole;

[0026] Set a protective glass on the top surface of the polarization-maintaining optical fiber layer.

[0027] In the present invention, the periphery of the LED light-emitting device is wrapped by the photoresist layer, so that the photoresist layer can absorb the light of the LED device itself and the light scattered by other substances, thereby reducing the noise light and reducing the influence of the noise light on the fingerprint reflected light; since the polarization-maintaining optical fiber layer is made of a transparent and light-transmitting material, the fingerprint reflected light can directly pass through the polarization-maintaining optical fiber layer and be transmitted to the fingerprint sensing array; after reducing the noise light, the fingerprint sensing array can directly perform fingerprint recognition according to the fingerprint reflected light, thereby improving the recognition accuracy and reducing the recognition error.

[0028] The above description is only an overview of the technical solutions of the embodiments of the present invention. In order to be able to understand the technical means of the embodiments of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the embodiments of the present invention more obvious and understandable, the following specifically describes the embodiments of the present invention. Description of the Drawings

[0029] The accompanying drawings are only used to illustrate the embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference signs are used to denote the same components. In the drawings:

[0030] Figure 1 Shows a schematic structural diagram of a first embodiment of the LED fingerprint recognition device provided by the present invention;

[0031] Figure 2 Shows a top view of a first embodiment of the LED fingerprint recognition device provided by the present invention;

[0032] Figure 3 Shows a schematic structural diagram of a second embodiment of the LED fingerprint recognition device provided by the present invention;

[0033] Figure 4 Shows a cross-sectional view of the light via provided by the present invention.

[0034] Figure 5 Shows an optical path diagram of the emitted light of the LED light-emitting device provided by the present invention;

[0035] Figure 6 Shows an optical path diagram of the fingerprint reflected light provided by the present invention;

[0036] Figure 7 Shows an optical path diagram of the noise light of the LED light-emitting device provided by the present invention;

[0037] Figure 8 Shows an optical path diagram of the fingerprint sensing array receiving light provided by the present invention;

[0038] Figure 9 Shows a schematic structural diagram of a third embodiment of the LED fingerprint recognition device provided by the present invention;

[0039] Figure 10 Shows a schematic structural diagram of a fourth embodiment of the LED fingerprint recognition device provided by the present invention;

[0040] Figure 11 Shows a schematic flow diagram of a first embodiment of the manufacturing method of the LED fingerprint recognition device provided by the present invention;

[0041] Figure 12 Shows the manufacturing structure schematic of a second embodiment of the LED fingerprint recognition device provided by the present invention Figure 1 ;

[0042] Figure 13 Shows the manufacturing structure schematic of a second embodiment of the LED fingerprint recognition device provided by the present invention Figure 2 ;

[0043] Figure 14Shows the schematic manufacturing structure of the second embodiment of the LED fingerprint recognition device provided by the present invention Figure 3 ;

[0044] Figure 15 Shows the schematic structural diagram of the grating layer provided by the present invention;

[0045] Figure 16 Shows the schematic manufacturing structure of the fourth embodiment of the LED fingerprint recognition device provided by the present invention Figure 1 ;

[0046] Figure 17 Shows the schematic manufacturing structure of the fourth embodiment of the LED fingerprint recognition device provided by the present invention Figure 2 ;

[0047] Figure 18 Shows the schematic manufacturing structure of the fourth embodiment of the LED fingerprint recognition device provided by the present invention Figure 3 ;

[0048] Figure 19 Shows the schematic flow diagram of the first embodiment of the manufacturing device of the LED fingerprint recognition device provided by the present invention;

[0049] Figure 20 Shows the schematic structural diagram of the embodiment of the manufacturing equipment of the LED fingerprint recognition device provided by the present invention;

[0050] In the figure: fingerprint sensing array 1, photoresist layer 2, driving substrate 3, LED light-emitting device 4, polarization-maintaining optical fiber layer 5, CMOS substrate 6, first protective glass 7, first linear polarizer 8, grating layer 9, second protective glass 10, light via hole 51, first ITO film layer 52, liquid crystal layer 53, second ITO film layer 54. Detailed implementation manners

[0051] Hereinafter, the exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein.

[0052] Refer to Figure 1 , which shows the schematic structural diagram of the first embodiment of the LED fingerprint recognition device provided by the present invention. As Figure 1 shown, in one embodiment, the LED fingerprint recognition device includes: a fingerprint sensing array 1, a photoresist layer 2, a driving substrate 3, and an LED light-emitting device 4.

[0053] The driving substrate 3 is disposed on the top surface of the fingerprint sensing array 1, the photoresist layer 2 is disposed on the top surface of the driving substrate 3, and the LED light-emitting device 4 is disposed within the photoresist layer 2 such that the photoresist material of the photoresist layer 2 wraps around the periphery of the LED light-emitting device 4;

[0054] The photoresist layer 2 is provided with a polarization-maintaining optical fiber layer 5 that is light-transmissive above the fingerprint sensing array 1 in the vertical direction.

[0055] During use, the user can press on the top surface of the LED light-emitting device 4, and the LED light-emitting device 4 can emit light towards its top surface such that the light can irradiate on the user's fingerprint. Subsequently, the user's fingerprint can reflect the light emitted by the LED light-emitting device 4. Among them, part of the reflected light will be absorbed by the underlying photoresist layer 2, and the photoresist layer 2 is provided with a polarization-maintaining optical fiber layer 5 that is light-transmissive, and the light reflected by the user's fingerprint can pass through the polarization-maintaining optical fiber layer 5 and be transmitted to the underlying fingerprint sensing array 1 such that the fingerprint sensing array 1 can perform fingerprint recognition based on the reflected light of the fingerprint.

[0056] Among them, the photoresist layer 2 can be made of a material that absorbs or isolates light. Specifically, the photoresist layer 2 can be fabricated by means of coating or evaporation, and the material can be selected as a black photoresist material. The polarization-maintaining optical fiber layer 5 can be made of a transparent and light-transmissive material. The driving substrate 3 is used to drive the LED light-emitting device 4, and at the same time, the driving substrate 3 can also be made of a light-transmissive material such that the light reflected by the user's fingerprint can be transmitted to the underlying fingerprint sensing array 1.

[0057] Optionally, a polarization-maintaining optical fiber structure can also be fabricated on the driving substrate 3, or a finished polarization-maintaining optical fiber array can be disposed on the driving substrate 3.

[0058] In order to drive the fingerprint sensing array 1, referring to Figure 1 , in one embodiment, a CMOS substrate 6 can be disposed at the bottom of the fingerprint sensing array 1, and the fingerprint sensing array 1 can be driven by the CMOS substrate 6 to perform fingerprint recognition.

[0059] It should be noted that the fingerprint sensing array 1 can be a sensing array composed of a plurality of photoelectric converters. The entire working process is simply divided into charging, photosensing, and discharging. The released electrons are transmitted into the chip, amplified by an analog amplifier circuit, and then converted through the signal conversion of the analog and digital electronics of the system into a final digital image that can be recognized by a computer. During recognition, the fingerprint sensing array 1 can transmit the collected reflected light to a computer at the backend for recognition, and perform operations such as image processing optimization on the recognized image.

[0060] Referring to Figure 2 , a top view of the first embodiment of the LED fingerprint recognition device provided by the present invention is shown.

[0061] Since the planar area of the user's fingerprint is larger than that of the fingerprint sensing array 1, after the photoresist layer 2 absorbs the reflected light of the user's fingerprint, the fingerprint sensing array 1 can collect less fingerprint reflected light. Using only one fingerprint sensing array 1 to collect partial fingerprint reflected light for recognition is difficult and has low accuracy. To improve the recognition accuracy, two or more fingerprint sensing arrays 1 can be set.

[0062] Among them, two or more fingerprint sensing arrays 1 can be arranged around the LED light-emitting device 4. In an optional embodiment, the LED light-emitting device 4 can be arranged at the central position.

[0063] Specifically, the fingerprint sensing array 1 can be centered on the LED light-emitting device 4 and arranged around the LED light-emitting device 4.

[0064] Refer to Figure 2 , in a preferred embodiment, there can be four fingerprint sensing arrays 1, and the LED light-emitting device 4 can be arranged at the central position of the photoresist layer 2; the four fingerprint sensing arrays 1 can be symmetrically arranged centered on the LED light-emitting device 4.

[0065] In the present invention, the periphery of the LED light-emitting device is wrapped by the photoresist layer, so that the photoresist layer can absorb the light of the LED device itself and the light scattered by other substances, thereby reducing the noise light and the influence of the noise light on the fingerprint reflected light; since the polarization-maintaining optical fiber layer is made of a transparent and light-transmitting material, the fingerprint reflected light can directly pass through the polarization-maintaining optical fiber layer and be transmitted to the fingerprint sensing array; after reducing the noise light, the fingerprint sensing array can directly perform fingerprint recognition based on the fingerprint reflected light, and thus the recognition accuracy can be improved and the recognition error can be reduced.

[0066] In order to concentrate the light emitted by the user's fingerprint and transmit it to the fingerprint sensing array 1 as much as possible for the fingerprint sensing array 1 to perform fingerprint recognition based on the fingerprint reflected light, refer to Figure 3 , which shows a schematic structural diagram of the second embodiment of the LED fingerprint recognition device provided by the present invention. As Figure 3 shown, in an embodiment, the LED fingerprint recognition device also includes: a fingerprint sensing array 1, a photoresist layer 2, a driving substrate 3, and an LED light-emitting device 4.

[0067] The driving substrate 3 is arranged on the top surface of the fingerprint sensing array 1, the photoresist layer 2 is arranged on the top surface of the driving substrate 3, and the LED light-emitting device 4 is arranged in the photoresist layer 2 so that the photoresist material of the photoresist layer 2 wraps around the periphery of the LED light-emitting device 4;

[0068] The photoresist layer 2 is provided with a light-transmitting polarization-maintaining optical fiber layer 5 above the fingerprint sensing array 1 in the vertical direction.

[0069] Among them, the polarization-maintaining optical fiber layer 5 is provided with a plurality of light vias 51 in a direction perpendicular to the top surface of the fingerprint sensing array 1 for the reflected light to be transmitted to the fingerprint sensing array 1.

[0070] During use, the light reflected by the fingerprint can converge on a plurality of light vias and enter the fingerprint sensing array 1 after passing through the plurality of light vias.

[0071] Refer to Figure 3 , in order to further converge more light reflected by the fingerprint, in one embodiment, there are three light vias, one of which can be arranged at the center position of the polarization-maintaining optical fiber layer 5, and the other two light vias are symmetrically arranged with the light via at the center position as the center.

[0072] Refer to Figure 4 , which shows a cross-sectional view of the light via provided by the present invention. The positions of the three light vias can be as Figure 4 shown.

[0073] Optionally, there are five light vias, one of which can be arranged at the center position of the polarization-maintaining optical fiber layer 5, and the other four light vias are symmetrically arranged with the light via at the center position as the center.

[0074] Among them, the polarization-maintaining optical fiber layer 5 is made of a transparent and colorless first material with a refractive index of W. The center light via is filled with a transparent and colorless second material with a refractive index of Y, and Y is greater than W.

[0075] In one operation mode, the first material of the polarization-maintaining optical fiber layer 5 can be silicon dioxide (SiO2). The second material injected into the center light via can also be silicon dioxide (SiO2), and the refractive indices of the two silicon dioxides are different. Specifically, the second material can be silicon dioxide doped with a doping substance (such as germanium), so that the refractive index of the silicon dioxide in the light via is greater than the refractive index of the silicon dioxide in the polarization-maintaining optical fiber layer 5.

[0076] In a preferred embodiment, the refractive index of the silicon dioxide in the light via can be greater than the refractive index of other transparent film layers of the device.

[0077] Since the refractive index of the material in the center light via is greater than the refractive index of the material of the polarization-maintaining optical fiber layer 5, the light reflected by the user's fingerprint can gradually converge at the center position of the polarization-maintaining optical fiber layer 5 and start to propagate at the center position. There are other light vias without injected material around the center position, and the light vias are aligned with the fingerprint sensing array 1, which can allow the light reflected by the fingerprint to be concentrated and transmitted to the fingerprint sensing array 1 through the light vias, so that the fingerprint sensing array 1 can use the converged light for fingerprint recognition to improve the recognition accuracy.

[0078] During actual use, the ambient light outside the device may also be transmitted to the fingerprint sensing array 1 through the light vias, affecting the recognition accuracy of the fingerprint sensing array 1. To isolate and shield the ambient light, referring to Figure 3 In one embodiment, the LED fingerprint recognition device may further include: a first protective glass 7 and a first linear polarizer 8.

[0079] The first protective glass 7 may be disposed on the top surface of the photoresist layer 2, and the first linear polarizer 8 may be disposed on the top surface of the first protective glass 7. Attaching the first linear polarizer 8 to the first protective glass 7 allows the first linear polarizer 8 to polarize the signal light and shield the external ambient light.

[0080] During actual use, the user's finger may press on the first linear polarizer 8, and the light reflected by the fingerprint can enter the fingerprint sensing array 1 after passing through the first linear polarizer 8. The first linear polarizer 8 can polarize the signal light and shield the reflection of the external ambient light on the metal electrodes inside the screen. After passing through the linear polarizer, only half of the linear polarization of the light source remains; when the light is reflected by the metal electrodes, light of various other polarization states will be formed. At this time, passing through the polarizer again will isolate most of the reflected ambient light. Also, due to the presence of the photoresist layer 2, the reflection of the ambient light can be ignored, thereby eliminating the ambient light.

[0081] Moreover, the noise light is natural light, and the polarization states of the noise light and the light reflected by the fingerprint are different, so the influence of the LED noise light can also be removed.

[0082] Referring to Figures 5 - 6 respectively show the optical path diagram of the emitted light of the LED light-emitting device provided by the present invention and the optical path diagram of the fingerprint-reflected light provided by the present invention.

[0083] When the user's finger presses on the fingerprint recognition area, the light emitted by the LED light-emitting device 4 becomes linearly polarized light after passing through the linear polarizer on the protective glass. Then, after the linearly polarized light irradiates the fingerprint and is reflected back to the fingerprint recognition area, when it reaches the interface of the protective glass again after passing through the linear polarizer, the reflected light is still linearly polarized light.

[0084] Since the photoresist layer 2 is a black photoresist material, the reflected light will be absorbed by the photoresist layer 2, and the linearly polarized light that is not absorbed by the photoresist layer 2 will reach the fingerprint array sensor below the driving substrate 3 along the via for the fingerprint array sensor to recognize according to the reflected light.

[0085] In this embodiment, since the refractive index of the material of the light via at the central position is greater than that of the material of the polarization-maintaining fiber layer 5, according to the theory of optically sparse - optically dense media, the light reflected by the user's fingerprint can gradually converge at the central position of the polarization-maintaining fiber layer 5, and the irradiated light will gradually converge and propagate at the light via at the central position and start to propagate at the central position. There are other light vias without injected material around the central position, and the light vias are aligned with the fingerprint sensing array 1. The two directions perpendicular and horizontal at the center point are asymmetric, so the birefringence effect on the transmitted light is very strong. The stronger the birefringence effect, the better the polarization state of the light can be maintained. Therefore, after the light passes through the light via, the light reaching the fingerprint array sensor is still linearly polarized light. The light reflected by the fingerprint can be concentrated to pass through the light via and transmitted to the fingerprint sensing array 1, so that the fingerprint sensing array 1 can use the converging light for fingerprint recognition to improve the recognition accuracy.

[0086] Refer to Figures 7 - 8 , which respectively show the optical path diagram of the noise light of the LED light-emitting device provided by the present invention and the optical path diagram of the fingerprint sensing array receiving light provided by the present invention.

[0087] In addition, there will also be light leakage from the LED light-emitting device 4 reaching the fingerprint array sensor, including: the light leakage at the bottom of the LED light-emitting device 4 and the light that reaches the fingerprint sensing array 1 after the light emitted by the LED light-emitting device 4 is scattered and reflected by the upper film layer. Specifically, it can be as Figure 7 shown. However, the light emitted from the bottom of the LED light-emitting device 4 is less because the bottom of the LED light-emitting device 4 generally has a high-reflectivity structure. Most of the light scattered and reflected will be absorbed by the photoresist layer 2, and a small part of the light will not be absorbed by the photoresist layer 2 and reach the junction of the polarization-maintaining structure. However, this kind of light is the light with a large viewing angle emitted by the LED light-emitting device 4 (the reason is that the light via is at the same height as the light-emitting surface of the LED light-emitting device 4 and far from the light-emitting surface). Since the refractive index of the via is the largest in the film layer, it will disappear due to total reflection, as specifically shown in Figure 8 shown. At this time, the intensity of the noise light caused by the LED light-emitting device 4 is very small and is natural light, which is different in nature from the linearly polarized light reflected by the fingerprint and can be distinguished, thereby improving the recognition accuracy.

[0088] In addition, natural light can be decomposed into two linearly polarized lights with equal intensity, orthogonal vibration directions, but randomly changing phases. For these two polarized lights with respect to the propagation direction of the light, their vibration directions change randomly, and the two polarization planes are random.

[0089] However, for the polarized light (signal light) passing through the first protective glass 7 and the first polarizer 8, the angle of its polarization plane with respect to the propagation direction of the light is fixed. It can be understood that the signal light has only one polarization plane.

[0090] Therefore, the noise light emitted by the LED light-emitting device 4 only affects the signal light passing through the first protective glass 7 and the first linear polarizer 8 within an extremely short period of time, which can be regarded as noise. This noise can be easily removed by modifying the fingerprint recognition algorithm (the time affected by the noise is very short and the intensity is low).

[0091] If it does not pass through the first protective glass 7 and the first linear polarizer 8 here, the linearly polarized light (signal light) will gradually become elliptically polarized light or light with a disordered polarization state. There are countless polarization planes of the signal light. When it reaches the sensing array, it is mixed with the noise light emitted by the LED light-emitting device 4, and there is a component of the noise light of the LED light-emitting device 4 on each polarization plane. Therefore, it is very difficult to distinguish the signal light.

[0092] The present invention can isolate the reflection of most ambient light through the protective glass and the linear polarizer. At the same time, in combination with the photoresist layer, it can further eliminate ambient light, reduce noise light and reduce the influence of noise light on the fingerprint reflected light. Moreover, by providing light vias with different refractive indexes in the polarization-maintaining optical fiber layer, the light reflected by the user's fingerprint can gradually converge at the central position of the polarization-maintaining optical fiber layer and start to propagate at the central position, so that the light at the central position is concentrated and transmitted through the light vias around the central position to the fingerprint sensing array, enabling the fingerprint sensing array to perform fingerprint recognition using the converged light to improve the recognition accuracy.

[0093] In order to convert the light reflected by the fingerprint into polarized light, refer to Figure 9 , which shows a schematic structural diagram of the third embodiment of the LED fingerprint recognition device provided by the present invention. As Figure 9 shown, in one embodiment, the LED fingerprint recognition device also includes: a fingerprint sensing array 1, a photoresist layer 2, a driving substrate 3, and an LED light-emitting device 4.

[0094] The driving substrate 3 is disposed on the top surface of the fingerprint sensing array 1, the photoresist layer 2 is disposed on the top surface of the driving substrate 3, and the LED light-emitting device 4 is disposed within the photoresist layer 2 so that the photoresist material of the photoresist layer 2 wraps around the periphery of the LED light-emitting device 4;

[0095] The photoresist layer 2 is provided with a polarization-maintaining optical fiber layer 5 that is transmissive in the vertical direction above the fingerprint sensing array 1.

[0096] Among them, the light vias of the polarization-maintaining optical fiber layer 5 can also be provided with three. One of the light vias is disposed at the central position of the polarization-maintaining optical fiber layer 5, and the other two light vias are symmetrically disposed with the light via at the central position as the center. The specific structure can also be the same as that of the above embodiment, and specifically can refer to Figure 3 the structure, and specifically can also refer to the description of the above embodiment.

[0097] The difference between this embodiment and the above embodiment is that the LED fingerprint recognition device may further include: a grating layer 9 constructed by a metal grating, and the grating layer 9 may be disposed on the top surface of the polarization-maintaining optical fiber layer 5; in addition, a transparent and colorless third material may be injected around the grating layer 9. The injected third material may also be silicon dioxide, and its refractive index may be the same as that of the silicon dioxide of the polarization-maintaining optical fiber layer 5.

[0098] During actual operation, the grating layer 9 can also play a role in polarization maintenance, that is, retaining polarized light. Specifically, the grating layer 9 may be a micro metal planar grating structure made of copper or aluminum metal. The grating period of the grating layer 9 is on the order of the optical wavelength. The grating layer 9 can utilize the oscillation characteristics of free electrons on the metal surface, so that the transverse electric polarized light parallel to the grating direction can excite electrons to oscillate along the wire grating direction, thereby causing reflection; while the transverse magnetic polarized light perpendicular to the grating direction cannot excite free electron oscillation due to the limitation of the periodic structure, and the transverse magnetic polarized light is transmitted. Therefore, the structure of the grating layer 9 has the function of a polarizer and polarizes the signal light. After transmitting light through the grating layer 9, the linearly polarized light can be directly transmitted into the fingerprint sensing array 1. The noise light is natural light, and the polarization states of the two are different, so the influence of the noise light of the LED light-emitting device 4 can also be removed, thereby improving the recognition accuracy.

[0099] In addition, in order to protect the grating layer 9 and prevent the user's finger from directly touching the grating layer 9, referring to Figure 9 , in one embodiment, the LED fingerprint recognition device further includes: a second protective glass 10; the second protective glass 10 is disposed on the top surface of the grating layer 9. The grating layer 9 can be protected by the second glass 10. The second protective glass 10 and the first protective glass 7 may be made of the same material.

[0100] In the present invention, a grating layer is disposed above the polarization-maintaining optical fiber layer. The grating layer can utilize the oscillation characteristics of free electrons on the metal surface, so that the transverse electric polarized light parallel to the grating direction can excite electrons to oscillate along the wire grating direction; while the transverse magnetic polarized light perpendicular to the grating direction cannot excite free electron oscillation due to the limitation of the periodic structure, and the transverse magnetic polarized light is transmitted, and the light reflected by the fingerprint can be polarized, thereby eliminating the noise light of the LED light-emitting device, so that the fingerprint sensing array can perform recognition processing according to the fingerprint reflected light that eliminates the line noise light, so as to improve the recognition accuracy.

[0101] In order to convert the light reflected by the fingerprint into polarized light, referring to Figure 10 , a schematic structural diagram of a fourth embodiment of the LED fingerprint recognition device provided by the present invention is shown. As Figure 10 shown, in one embodiment, the LED fingerprint recognition device also includes: a fingerprint sensing array 1, a photoresist layer 2, a driving substrate 3, and an LED light-emitting device 4.

[0102] The driving substrate 3 is disposed on the top surface of the fingerprint sensing array 1, the photoresist layer 2 is disposed on the top surface of the driving substrate 3, and the LED light emitting device 4 is disposed in the photoresist layer 2 so that the photoresist material of the photoresist layer 2 wraps around the periphery of the LED light emitting device 4;

[0103] The photoresist layer 2 is provided with a polarization-maintaining optical fiber layer 5 that is transmissive in the vertical direction above the fingerprint sensing array 1. Its structure and connection relationship are the same as those of Figure 1 the embodiment, and specific reference may be made to the description of the above embodiment.

[0104] In this embodiment, the polarization-maintaining optical fiber layer 5 may include a first ITO film layer 52, a liquid crystal layer 53, and a second ITO film layer 54 that are stacked in sequence from bottom to top.

[0105] Specifically, the first ITO film layer 52 and the second ITO film layer 54 may be light-transmissive layers constructed by indium tin oxide ITO. At the same time, a photo-alignment adhesive material may be coated on the indium tin oxide to form the ITO film layer.

[0106] In actual operation, the liquid crystal flipping of the liquid crystal layer 53 can be controlled by the electrodes of the upper and lower ITO film layers, so that the liquid crystal of the liquid crystal layer 53 has the function of polarization-maintaining.

[0107] When fingerprint recognition is performed, most of the light emitted by the LED light emitting device 4 and the light reflected by the fingerprint are absorbed by the photoresist layer 2, and a small amount of light that is not absorbed by the photoresist layer 2 reaches the junction of the polarization-maintaining optical fiber layer 5. However, this kind of light is the large-angle light emitted by the LED light emitting device 4. Since the refractive index of the liquid crystal is also very large, the reflected light can be eliminated, thereby achieving the effect of eliminating noise light, reducing the influence of noise light, and improving the recognition accuracy of the fingerprint sensing array 1.

[0108] In the present invention, the first ITO film layer, the liquid crystal layer, and the second ITO film layer are stacked in sequence from bottom to top in the polarization-maintaining optical fiber layer. The liquid crystal with a relatively large refractive index can polarize the light reflected by the fingerprint, thereby eliminating the noise light of the LED light emitting device, so that the fingerprint sensing array can perform recognition processing according to the fingerprint reflected light that eliminates the line noise light, so as to improve the recognition accuracy.

[0109] Referring to Figure 11 , a schematic flow chart of a first embodiment of a manufacturing method of an LED fingerprint recognition device provided by the present invention is shown. This method is executed by a manufacturing device of the LED fingerprint recognition device. As Figure 1 shown, the method includes the following steps:

[0110] Step 110: Set a driving substrate on the fingerprint sensing array.

[0111] Step 120: After setting the LED light-emitting device on the driving substrate, a black material is injected around the LED light-emitting device by a coating method or an evaporation method to form a photoresist layer.

[0112] Step 130: After lithographing a photoresist via hole in the photoresist layer directly above the fingerprint sensing array, a polarization-maintaining optical fiber layer is constructed in the photoresist via hole.

[0113] Step 140: A protective glass is provided on the top surface of the polarization-maintaining optical fiber layer.

[0114] Step 150: A linear polarizer is provided on the top surface of the protective glass.

[0115] Specifically, a driving substrate can be set on the fingerprint sensing array. Then, an LED light-emitting device is set on the driving substrate. Next, a photoresist layer can be fabricated on the backplane of the LED light-emitting device, which can be specifically fabricated by a coating or evaporation method, and the material can be selected as a black photoresist material.

[0116] Next, a photoresist via hole (Via) can be lithographically fabricated on the photoresist layer structure, so that a polarization-maintaining optical fiber layer can be fabricated in the photoresist via hole (Via). Finally, a protective glass (Cover Glass) is placed, and a polarizer is attached to the protective glass to polarize the signal light and shield the external ambient light.

[0117] The structure of the fabricated LED fingerprint recognition device can be as Figure 1 shown.

[0118] In one embodiment, the polarization-maintaining optical fiber layer can be provided with a plurality of light via holes, and its structure is as Figure 3 shown. Among them, as an example, the step of constructing the polarization-maintaining optical fiber layer in the photoresist via hole may include the following sub-steps:

[0119] Step 210: After injecting silicon dioxide into the photoresist via hole, three light via holes are obtained by lithographing the silicon dioxide, where one light via hole is at the center position, and two light via holes are symmetrically arranged with the light via hole at the center position as the center.

[0120] Step 220: Inject silicon dioxide into the light via hole at the center position to obtain the polarization-maintaining optical fiber layer.

[0121] Among them, the refractive index of the silicon dioxide of the polarization-maintaining optical fiber layer is less than the refractive index of the silicon dioxide of the light via hole.

[0122] Specifically, referring to Figures 12 - 14 , the manufacturing structure schematic diagrams of the second embodiment of the LED fingerprint recognition device provided by the present invention are respectively shown Figure 1 and the manufacturing structure schematic diagrams of the second embodiment of the LED fingerprint recognition device provided by the present invention Figure 2Schematic diagram of the manufacturing structure of the second embodiment of the LED fingerprint recognition device provided by the present invention Figure 3 。

[0123] In specific operations, after lithographically fabricating photoresist vias on the photoresist layer structure, SiO2 materials doped with other materials (such as germanium) can be deposited in the photoresist vias to make its refractive index greater than that of other transparent film layers in the display screen. Then, lithography technology can be used to lithograph the silicon dioxide to obtain three light vias, one of which is in the center position, and the other two light vias are symmetrically arranged with the light via in the center position as the center. Then, SiO2 with a higher doping substance concentration (such as germanium) is deposited in the light via in the center position to make its refractive index greater than that of the SiO2 formed by the 1st lithography, and its structure Figures 12 - 14 is shown. No film layer is deposited in the remaining two vias to obtain a polarization-maintaining fiber layer, and its structure after fabrication can be as follows Figure 3 shown.

[0124] In one embodiment, a grating layer can be provided on the top layer of the polarization-maintaining fiber layer, and its structure is as Figure 9 shown. Among them, as an example, constructing the polarization-maintaining fiber layer in the photoresist via can include the following sub-steps:

[0125] Step 230: Set a grating layer on the top surface of the polarization-maintaining fiber layer.

[0126] Step 240: Inject silicon dioxide around the grating layer.

[0127] Referring to Figure 15 , a schematic diagram of the structure of the grating layer provided by the present invention is shown.

[0128] In specific operations, a cover glass can be placed on the driving substrate first, and a metal grating structure as Figure 15 shown can be fabricated at the position on the cover glass opposite to the photoresist via to obtain a grating layer. Copper or aluminum can be specifically used, and the grating period is of the order of the light wavelength, so e-book direct writing technology or two-beam exposure technology needs to be used for fabrication, and its structure after fabrication can be as follows Figure 9 shown.

[0129] After fabricating the grating layer, silicon dioxide can be injected around the grating layer. Its structure after injection can be as Figure 9 shown.

[0130] In one embodiment, a liquid crystal layer can be provided in the polarization-maintaining fiber layer, and its structure is as Figure 10 shown. Among them, as an example, constructing the polarization-maintaining fiber layer in the photoresist via can include the following sub-steps:

[0131] Step 410: Fabricate a first ITO film layer within the photoresist via.

[0132] Step 420: Drop liquid crystal onto the top surface of the first ITO film layer to obtain a liquid crystal layer.

[0133] Step 430: Fabricate a second ITO film layer on the top surface of the liquid crystal layer.

[0134] Specifically, referring to Figures 16 - 18 , the schematic manufacturing structures of the fourth embodiment of the LED fingerprint recognition device provided by the present invention are respectively shown Figure 1 , the schematic manufacturing structure of the fourth embodiment of the LED fingerprint recognition device provided by the present invention Figure 2 and the schematic manufacturing structure of the fourth embodiment of the LED fingerprint recognition device provided by the present invention Figure 3 .

[0135] In specific operations, after lithographically fabricating a photoresist via on the photoresist layer structure, an ITO (indium tin oxide) film layer can be fabricated under the photoresist via using a lithography process, and a photo-alignment adhesive can be coated to obtain a first ITO film layer. Then, ultraviolet photo-alignment can be used, and liquid crystal can be dropped into the via to obtain a liquid crystal layer. Finally, taking the polarization method of a polarizer as an example, an ITO + photo-alignment film layer can be fabricated on the protective glass and aligned with the driving substrate to obtain a second ITO film layer. The structure after fabrication can be as follows Figure 10 shown.

[0136] The present invention sets a driving substrate in the fingerprint sensing array; after setting an LED light-emitting device on the driving substrate, a black material is injected around the LED light-emitting device by a coating method or an evaporation method to form a photoresist layer; after lithographically fabricating a photoresist via in the photoresist layer directly above the fingerprint sensing array, a polarization-maintaining optical fiber layer is constructed within the photoresist via; a protective glass is arranged on the top surface of the polarization-maintaining optical fiber layer. Through the above method, an LED fingerprint recognition device can be quickly fabricated, and a polarization-maintaining optical fiber layer is arranged directly above the fingerprint sensing array. The photoresist layer can not only absorb the reflected and scattered light sources, but the polarization-maintaining optical fiber layer can retain the light reflected by the fingerprint, enabling the fingerprint sensing array to identify based on the light reflected by the fingerprint, thereby improving the recognition accuracy.

[0137] Figure 19 shows a schematic flowchart of the first embodiment of the manufacturing apparatus of the LED fingerprint recognition device provided by the present invention. As Figure 19 shown, the apparatus 1900 includes: a substrate module 1910, a photoresist module 1920, a light module 1930, and a glass module 1940.

[0138] The substrate module is used to set a driving substrate in the fingerprint sensing array;

[0139] The photoresist module is used to inject a black material around the LED light-emitting device by means of coating or evaporation after the LED light-emitting device is arranged on the driving substrate to form a photoresist layer;

[0140] The light module is used to construct the polarization-maintaining optical fiber layer in the photoresist via-hole after photolithographing the photoresist via-hole in the photoresist layer directly above the fingerprint sensing array vertically;

[0141] The glass module is used to arrange a protective glass on the top surface of the polarization-maintaining optical fiber layer.

[0142] In an optional manner, the light module is further used for:

[0143] After injecting silicon dioxide into the photoresist via-hole, performing photolithography on the silicon dioxide to obtain three light via-holes, wherein one light via-hole is at the central position, and two light via-holes are symmetrically arranged with the light via-hole at the central position as the center;

[0144] Injecting silicon dioxide into the light via-hole at the central position to obtain the polarization-maintaining optical fiber layer;

[0145] Wherein, the refractive index of the silicon dioxide of the polarization-maintaining optical fiber layer is less than the refractive index of the silicon dioxide of the light via-hole.

[0146] In an optional manner, the light module is further used for:

[0147] Arranging a grating layer on the top surface of the polarization-maintaining optical fiber layer;

[0148] Injecting silicon dioxide around the grating layer.

[0149] In an optional manner, the light module is further used for:

[0150] Constructing the polarization-maintaining optical fiber layer in the photoresist via-hole, including:

[0151] Fabricating a first ITO film layer in the photoresist via-hole;

[0152] Dripping liquid crystal on the top surface of the first ITO film layer to obtain a liquid crystal layer;

[0153] Fabricating a second ITO film layer on the top surface of the liquid crystal layer.

[0154] In an optional manner, the device further includes:

[0155] The linear polarization module is used to arrange a linear polarizer on the top surface of the protective glass.

[0156] Figure 20The figure shows a schematic structural diagram of an embodiment of a manufacturing device for an LED fingerprint recognition device provided by the present invention. The specific implementation of the manufacturing device for the LED fingerprint recognition device is not limited in the specific embodiments of the present invention.

[0157] As Figure 20 shown, the manufacturing device for the LED fingerprint recognition device may include: a processor 402, a communications interface 404, a memory 406, and a communication bus 408.

[0158] Among them: The processor 402, the communications interface 404, and the memory 406 communicate with each other through the communication bus 408. The communications interface 404 is used to communicate with network elements of other devices such as clients or other servers. The processor 402 is used to execute the program 410, and specifically can execute the relevant steps in the above-mentioned embodiment of the manufacturing method for the LED fingerprint recognition device.

[0159] Specifically, the program 410 may include program code, and the program code includes computer-executable instructions.

[0160] The processor 402 may be a central processing unit CPU, or a specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present invention. One or more processors included in the manufacturing device for the LED fingerprint recognition device may be of the same type of processor, such as one or more CPUs; or may be of different types of processors, such as one or more CPUs and one or more ASICs.

[0161] The memory 406 is used to store the program 410. The memory 406 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk memory.

[0162] The program 410 can specifically be called by the processor 402 to enable the manufacturing device for the LED fingerprint recognition device to perform the following operations:

[0163] Set a driving substrate on the fingerprint sensing array;

[0164] After setting the LED light-emitting device on the driving substrate, inject a black material around the LED light-emitting device by a coating method or an evaporation method to form a photoresist layer;

[0165] After lithographing a photoresist via hole in the photoresist layer directly above the fingerprint sensing array, construct the polarization-maintaining optical fiber layer in the photoresist via hole;

[0166] A protective glass is provided on the top surface of the polarization-maintaining optical fiber layer.

[0167] In an alternative manner, constructing the polarization-maintaining optical fiber layer in the photoresist via-hole includes:

[0168] After injecting silica into the photoresist via-hole, lithography is performed on the silica to obtain three light via-holes, where one light via-hole is at the central position and two light via-holes are symmetrically arranged with the light via-hole at the central position as the center;

[0169] Inject silica into the light via-hole at the central position to obtain a polarization-maintaining optical fiber layer;

[0170] Wherein, the refractive index of the silica of the polarization-maintaining optical fiber layer is less than the refractive index of the silica of the light via-hole.

[0171] In an alternative manner, after the step of injecting silica into the light via-hole at the central position, the method further includes:

[0172] Providing a grating layer on the top surface of the polarization-maintaining optical fiber layer;

[0173] Inject silica around the periphery of the grating layer.

[0174] In an alternative manner, constructing the polarization-maintaining optical fiber layer in the photoresist via-hole includes:

[0175] Fabricating a first ITO film layer in the photoresist via-hole;

[0176] Dripping liquid crystal on the top surface of the first ITO film layer to obtain a liquid crystal layer;

[0177] Fabricating a second ITO film layer on the top surface of the liquid crystal layer.

[0178] In an alternative manner, after the step of providing a protective glass on the top surface of the polarization-maintaining optical fiber layer, the method further includes:

[0179] Providing a linear polarizer on the top surface of the protective glass.

[0180] In an alternative manner, the program 410 is called by the processor 402 to cause the manufacturing device of the LED fingerprint recognition device to perform the following operations:

[0181] Providing a driving substrate on the fingerprint sensing array;

[0182] After providing an LED light-emitting device on the driving substrate, a black material is injected around the periphery of the LED light-emitting device by a coating method or an evaporation method to form a photoresist layer;

[0183] After lithographically forming photoresist vias in the photoresist layer directly above the fingerprint sensing array, a polarization-maintaining optical fiber layer is formed within the photoresist vias;

[0184] A protective glass is disposed on the top surface of the polarization-maintaining optical fiber layer.

[0185] In an alternative embodiment, forming the polarization-maintaining optical fiber layer within the photoresist vias includes:

[0186] After injecting silica into the photoresist vias, three light vias are formed by lithography on the silica, with one light via at the center position and two light vias symmetrically disposed about the light via at the center position;

[0187] Silica is injected into the light via at the center position to obtain the polarization-maintaining optical fiber layer;

[0188] Wherein, the refractive index of the silica in the polarization-maintaining optical fiber layer is less than the refractive index of the silica in the light vias.

[0189] In an alternative embodiment, after the step of injecting silica into the light via at the center position, the method further includes:

[0190] A grating layer is disposed on the top surface of the polarization-maintaining optical fiber layer;

[0191] Silica is injected around the periphery of the grating layer.

[0192] In an alternative embodiment, forming the polarization-maintaining optical fiber layer within the photoresist vias includes:

[0193] A first ITO film layer is formed within the photoresist vias;

[0194] Liquid crystal is dripped onto the top surface of the first ITO film layer to obtain a liquid crystal layer;

[0195] A second ITO film layer is formed on the top surface of the liquid crystal layer.

[0196] In an alternative embodiment, after the step of disposing a protective glass on the top surface of the polarization-maintaining optical fiber layer, the method further includes:

[0197] A linear polarizer is disposed on the top surface of the protective glass.

[0198] Embodiments of the present invention provide a computer-readable storage medium storing at least one executable instruction, which, when running on a manufacturing device / apparatus of an LED fingerprint recognition device, causes the manufacturing device / apparatus of the LED fingerprint recognition device to execute the manufacturing method of the LED fingerprint recognition device in any of the above method embodiments.

[0199] The executable instructions can specifically be used to cause the manufacturing equipment / device of the LED fingerprint recognition device to perform the following operations:

[0200] Set the driving substrate in the fingerprint sensing array;

[0201] After setting the LED light-emitting device on the driving substrate, inject black material around the LED light-emitting device by coating method or evaporation method to form a photoresist layer;

[0202] After lithographing a photoresist via hole in the photoresist layer directly above the fingerprint sensing array vertically, construct the polarization-maintaining optical fiber layer in the photoresist via hole;

[0203] Set a protective glass on the top surface of the polarization-maintaining optical fiber layer.

[0204] In an alternative manner, constructing the polarization-maintaining optical fiber layer in the photoresist via hole includes:

[0205] After injecting silicon dioxide into the photoresist via hole, perform lithography on the silicon dioxide to obtain three light via holes, where one light via hole is at the central position and two light via holes are symmetrically arranged with the light via hole at the central position as the center;

[0206] Inject silicon dioxide into the light via hole at the central position to obtain the polarization-maintaining optical fiber layer;

[0207] Wherein, the refractive index of the silicon dioxide of the polarization-maintaining optical fiber layer is less than the refractive index of the silicon dioxide of the light via hole.

[0208] In an alternative manner, after the step of injecting silicon dioxide into the light via hole at the central position, the method further includes:

[0209] Set a grating layer on the top surface of the polarization-maintaining optical fiber layer;

[0210] Inject silicon dioxide around the grating layer.

[0211] In an alternative manner, constructing the polarization-maintaining optical fiber layer in the photoresist via hole includes:

[0212] Fabricate a first ITO film layer in the photoresist via hole;

[0213] Drop liquid crystal on the top surface of the first ITO film layer to obtain a liquid crystal layer;

[0214] Fabricate a second ITO film layer on the top surface of the liquid crystal layer.

[0215] In an alternative manner, after the step of setting a protective glass on the top surface of the polarization-maintaining optical fiber layer, the method further includes:

[0216] A linear polarizer is disposed on the top surface of the protective glass.

[0217] In an alternative manner, the executable instructions cause the manufacturing equipment / apparatus of the LED fingerprint recognition device to perform the following operations:

[0218] A driving substrate is disposed on the fingerprint sensing array;

[0219] After an LED light-emitting device is disposed on the driving substrate, a black material is injected around the LED light-emitting device by a coating method or an evaporation method to form a photoresist layer;

[0220] After photolithographing a photoresist via hole in the photoresist layer directly above the fingerprint sensing array vertically, a polarization-maintaining optical fiber layer is constructed in the photoresist via hole;

[0221] A protective glass is disposed on the top surface of the polarization-maintaining optical fiber layer.

[0222] In an alternative manner, constructing the polarization-maintaining optical fiber layer in the photoresist via hole includes:

[0223] After injecting silicon dioxide into the photoresist via hole, three light via holes are obtained by photolithographing the silicon dioxide, wherein one light via hole is at the central position, and two light via holes are symmetrically disposed with the light via hole at the central position as the center;

[0224] Silicon dioxide is injected into the light via hole at the central position to obtain a polarization-maintaining optical fiber layer;

[0225] Wherein, the refractive index of the silicon dioxide of the polarization-maintaining optical fiber layer is less than the refractive index of the silicon dioxide of the light via hole.

[0226] In an alternative manner, after the step of injecting silicon dioxide into the light via hole at the central position, the method further includes:

[0227] A grating layer is disposed on the top surface of the polarization-maintaining optical fiber layer;

[0228] Silicon dioxide is injected around the grating layer.

[0229] In an alternative manner, constructing the polarization-maintaining optical fiber layer in the photoresist via hole includes:

[0230] A first ITO film layer is fabricated in the photoresist via hole;

[0231] Liquid crystal is dropped on the top surface of the first ITO film layer to obtain a liquid crystal layer;

[0232] A second ITO film layer is fabricated on the top surface of the liquid crystal layer.

[0233] In an alternative manner, after the step of disposing the protective glass on the top surface of the polarization-maintaining optical fiber layer, the method further includes:

[0234] Disposing a linear polarizer on the top surface of the protective glass.

[0235] The algorithms or displays provided herein are not inherently related to any particular computer, virtual system, or other device. In addition, the embodiments of the present invention are not directed to any particular programming language.

[0236] In the specification provided herein, a large number of specific details are set forth. However, it can be understood that the embodiments of the present invention may be practiced without these specific details. Similarly, in order to streamline the present invention and assist in understanding one or more of the various aspects of the invention, in the above description of the exemplary embodiments of the present invention, the various features of the embodiments of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. Among them, the claims following the specific implementation manners are hereby expressly incorporated into the specific implementation manners, where each claim itself serves as a separate embodiment of the present invention.

[0237] Those skilled in the art can understand that the modules in the devices in the embodiments can be adaptively changed and disposed in one or more devices different from the embodiments. The modules or units or components in the embodiments can be combined into a module or unit or component, and in addition, they can be divided into multiple sub-modules or sub-units or sub-components. Except that at least some of such features and / or processes or units are mutually exclusive.

[0238] It should be noted that the above embodiments illustrate the present invention rather than limit the present invention, and those skilled in the art can design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention can be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In the unit claims listing several devices, several of these devices can be embodied by the same item of hardware. The use of the words first, second, and third, etc. does not denote any order. These words can be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be construed as limiting the order of execution.

Claims

1. An LED fingerprint recognition device, characterized in that: The LED fingerprint recognition device comprises: a fingerprint sensor array, a photoresist layer, a driving substrate and an LED light-emitting device; The driving substrate is arranged on the top surface of the fingerprint sensor array, the photoresist layer is arranged on the top surface of the driving substrate, and the LED light emitting device is arranged in the photoresist layer, so that the photoresist material of the photoresist layer wraps around the periphery of the LED light emitting device; The light-blocking layer is provided with a light-transmitting polarization-maintaining fiber layer above the fingerprint sensor array in the vertical direction. When the user's fingerprint reflects the light emitted by the LED light-emitting device and the reflected light is absorbed by the light-blocking layer around the polarization-maintaining fiber layer, the reflected light passes through the light-transmitting polarization-maintaining fiber layer and is transmitted to the fingerprint sensor array for identification.

2. The LED fingerprint recognition device according to claim 1, characterized in that: The polarization-maintaining optical fiber layer is provided with a plurality of light through holes in a direction perpendicular to the top surface of the fingerprint sensor array, so as to transmit the reflected light to the fingerprint sensor array.

3. The LED fingerprint recognition device according to claim 2, characterized in that: There are three light through holes, one of which is arranged at the center of the polarization-maintaining optical fiber layer, and the other two light through holes are arranged symmetrically with the light through hole at the center as the center; The polarization-maintaining optical fiber layer is made of a transparent and colorless first material, the refractive index of which is W. The light at the center is injected into a transparent and colorless second material through a hole, the refractive index of which is Y, and Y is greater than W.

4. The LED fingerprint recognition device according to claim 1, characterized in that: The polarization-maintaining optical fiber layer includes a first ITO film layer, a liquid crystal layer, and a second ITO film layer which are sequentially stacked from bottom to top.

5. The LED fingerprint recognition device according to any one of claims 1 to 4, characterized in that: The LED fingerprint recognition device further includes: a first protective glass and a first linear polarizer; The first protective glass is arranged on the top surface of the light blocking layer, and the first linear polarizing plate is arranged on the top surface of the first protective glass.

6. The LED fingerprint recognition device according to claim 2, characterized in that: The LED fingerprint recognition device further includes: a grating layer constructed by a metal grating, wherein the grating layer is arranged on the top surface of the polarization-maintaining optical fiber layer; A transparent and colorless third material is injected into the periphery of the grating layer.

7. The LED fingerprint recognition device according to claim 6, characterized in that: The LED fingerprint recognition device further includes: a second protective glass; The second protective glass is arranged on the top surface of the grating layer.

8. The LED fingerprint recognition device according to claim 1, characterized in that: The fingerprint sensor array is provided with four, and the LED light emitting device is arranged at the center of the photoresist layer; The four fingerprint sensor arrays are symmetrically arranged with the LED light emitting device as the center.

9. A method for manufacturing an LED fingerprint recognition device, characterized in that: The method comprises: A driving substrate is provided on the fingerprint sensor array; After the LED light-emitting device is arranged on the driving substrate, a black material is injected around the LED light-emitting device to form a photoresist layer by a coating method or an evaporation method; After photolithography of photoresist via holes in the photoresist layer vertically above the fingerprint sensor array, constructing the polarization-maintaining optical fiber layer in the photoresist via holes; A protective glass is arranged on the top surface of the polarization-maintaining optical fiber layer.

10. The method for manufacturing an LED fingerprint recognition device according to claim 9, characterized in that: The step of constructing the polarization-maintaining optical fiber layer in the light-blocking via hole comprises: After silicon dioxide is injected into the photoresist via hole, the silicon dioxide is photoetched to obtain three light via holes, wherein one light via hole is at a central position and two light via holes are symmetrically arranged with the light via hole at the central position as the center; Injecting silica into the light via hole at the center position to obtain a polarization-maintaining fiber layer; Wherein, the refractive index of the silica in the polarization-maintaining optical fiber layer is smaller than the refractive index of the silica in the light through hole.

11. The method for manufacturing an LED fingerprint recognition device according to claim 10, characterized in that: After the step of injecting silicon dioxide into the light via hole at the center, the method further comprises: Disposing a grating layer on the top surface of the polarization-maintaining optical fiber layer; Silicon dioxide is implanted around the grating layer.

12. The method for manufacturing an LED fingerprint recognition device according to claim 9, characterized in that: The step of constructing the polarization-maintaining optical fiber layer in the light-blocking via hole comprises: Making a first ITO film layer in the photoresist via hole; Dropping liquid crystal on the top surface of the first ITO film layer to obtain a liquid crystal layer; A second ITO film layer is formed on the top surface of the liquid crystal layer.

13. The method for manufacturing an LED fingerprint recognition device according to claim 9, characterized in that: After the step of providing a protective glass on the top surface of the polarization-maintaining optical fiber layer, the method further comprises: A linear polarizing plate is disposed on the top surface of the protective glass.

14. A manufacturing device for LED fingerprint recognition equipment, characterized in that: The device comprises: A substrate module, used to set a driving substrate on the fingerprint sensor array; A photoresist module, used for injecting a black material around the LED light-emitting device to form a photoresist layer by a coating method or an evaporation method after the LED light-emitting device is arranged on the driving substrate; A light module, used for constructing the polarization-maintaining optical fiber layer in the photoresistance via hole after photolithography of the photoresistance via hole in the photoresistance layer vertically above the fingerprint sensor array; The glass module is used to set a protective glass on the top surface of the polarization-maintaining optical fiber layer.

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