Optical fingerprint recognition system and optical fingerprint recognition device

Abstract

An optical fingerprint recognition system and an optical fingerprint recognition device are disclosed. The optical fingerprint recognition system includes a base, a photosensitive element, a light-emitting layer, and a protective layer. The photosensitive element is disposed above the base. The light-emitting layer is disposed above the photosensitive element, and the light-emitting layer includes a light-emitting element. The protective layer is disposed above the light-emitting layer. The optical fingerprint recognition system further includes a light path turning element between the photosensitive element and the protective layer. The light-emitting element is disposed in a side direction of the light path turning element and the photosensitive element, and the side direction is different from a stacking direction of the optical fingerprint recognition system. The optical fingerprint recognition device has the optical fingerprint recognition system.

Description

TECHNICAL FIELD

[0001] The present application relates to an optical fingerprint recognition system and an optical fingerprint recognition device, in particular, an optical fingerprint recognition system suitable for an optical fingerprint recognition device. BACKGROUND

[0002] In recent years, due to the popularity of smart mobile devices, a large amount of personal information is stored in smart mobile devices, so that the information security demand of smart mobile devices has been significantly improved. At present, there are many kinds of security systems on the market, such as graphical password authentication system, fingerprint recognition system and face recognition system, among which the popularity rate of the fingerprint recognition system is the highest. In the fingerprint recognition system, in the past, capacitive devices were mainly used, but now, in response to the demand of smart mobile devices towards high screen ratio, the under-screen fingerprint recognition system has developed rapidly. The under-screen fingerprint recognition system is mostly divided into optical and ultrasonic types, among which the optical type has the advantages of high recognition accuracy and easy integration in smart devices, and thus has rapidly popularized.

[0003] The optical under-screen fingerprint recognition system in the past is mostly configured below the screen and uses the screen as a light source to project light onto the user's fingerprint and then reflect it on the photosensitive element below the screen, so as to record the user's fingerprint and perform the fingerprint recognition process. However, such configuration will capture the residual image of many elements in the screen module when capturing the fingerprint image, thus easily producing Moire effect, resulting in poor image quality of the fingerprint and higher difficulty of fingerprint recognition. SUMMARY

[0004] In view of the above-mentioned problems, the present application provides an optical fingerprint recognition system and an optical fingerprint recognition device, which helps to improve the problem that the residual image of the elements in the screen module is captured when capturing the fingerprint image, so as to obtain an optical fingerprint recognition system and an optical fingerprint recognition device with high recognition accuracy and high fingerprint image quality.

[0005] The present application provides an optical fingerprint recognition system, which comprises a base, a photosensitive element, a light-emitting layer and a protective layer. The photosensitive element is arranged above the base. The light-emitting layer is arranged above the photosensitive element, and the light-emitting layer comprises a light-emitting element. The protective layer is arranged above the light-emitting layer. The optical fingerprint recognition system further comprises a light path turning element between the photosensitive element and the protective layer. The light-emitting element is arranged in a side direction of the photosensitive element, and the side direction is different from a stacking direction of the optical fingerprint recognition system.

[0006] The present application provides an optical fingerprint recognition device, comprising a plurality of light emitting elements, a plurality of light path turning elements, and a plurality of light sensing elements. The light emitting elements are arranged at equal intervals in a first direction and a second direction, wherein the first direction is substantially perpendicular to the second direction. The light path turning elements are arranged above the light emitting elements in a stacking direction of the optical fingerprint recognition device, the light path turning elements are arranged at equal intervals in the first direction, and each of the light path turning elements is located between two adjacent light emitting elements in the first direction, wherein the stacking direction is substantially perpendicular to the first direction and the second direction. The light sensing elements are arranged below the light emitting elements in the stacking direction, the light sensing elements are arranged at equal intervals in the first direction, and each of the light sensing elements is located between two adjacent light emitting elements in the first direction.

[0007] The optical fingerprint recognition system and the optical fingerprint recognition device according to the present application can avoid the residual image of the light emitting elements in the screen module when capturing the fingerprint image, and can effectively improve the quality of the fingerprint image by using the light path turning elements to turn the light path, thereby reducing the difficulty and time of fingerprint recognition and improving the accuracy of recognition.

[0008] The above description of the present disclosure and the following description of the embodiments are used to demonstrate and explain the spirit and principles of the present application, and provide further explanation of the scope of the patent application of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 A schematic diagram of an optical fingerprint recognition system according to a first embodiment of the present application is shown.

[0010] Figure 2 A schematic diagram of an optical fingerprint recognition system according to a second embodiment of the present application is shown.

[0011] Figure 3 A schematic diagram of an optical fingerprint recognition system according to a third embodiment of the present application is shown.

[0012] Figure 4a A schematic diagram of an optical fingerprint recognition system according to a fourth embodiment of the present application is shown.

[0013] Figure 4b A schematic diagram of a collimating unit of the optical fingerprint recognition system is shown. Figure 4a

[0014] A schematic diagram of an optical fingerprint recognition system according to a fifth embodiment of the present application is shown. Figure 5

[0015] A schematic diagram of an optical fingerprint recognition system according to a sixth embodiment of the present application is shown. Figure 6

[0016] Figure 7 ​FIG. 7 shows a schematic diagram of an optical fingerprint recognition system according to a seventh embodiment of the present application.

[0017] Figure 8 FIG. 8 shows a schematic diagram of an optical fingerprint recognition system according to an eighth embodiment of the present application.

[0018] Figure 9 FIG. 9 shows a schematic diagram of an optical fingerprint recognition system according to a ninth embodiment of the present application.

[0019] Figure 10 FIG. 10 shows a schematic diagram of an application of an optical fingerprint recognition device according to a tenth embodiment of the present application.

[0020] Figure 11 FIG. 11 shows a schematic diagram of an optical fingerprint recognition device according to the tenth embodiment of the present application. Figure 10

[0021] FIG. 12 shows a schematic diagram of a configuration relationship of an optical fingerprint recognition device according to the tenth embodiment of the present application. Figure 12 Figure 10 FIG. 13 shows an exploded schematic diagram of an optical fingerprint recognition device according to the tenth embodiment of the present application.

[0022] Figure 13 Figure 10 FIG. 14 shows a chart of a wavelength band and a transmittance of a light interference filter layer and a light absorption filter layer when the light interference filter layer is irradiated by light at an incident angle of 0 degree according to an embodiment of the present application.

[0023] Figure 14 FIG. 15 shows a chart of a wavelength band and a transmittance of a light interference filter layer and a light absorption filter layer when the light interference filter layer is irradiated by light at an incident angle of 45 degree according to an embodiment of the present application.

[0024] Figure 15 FIG. 15 shows a chart of a wavelength band and a transmittance of a light interference filter layer and a light absorption filter layer when the light interference filter layer is irradiated by light at an incident angle of 45 degree according to an embodiment of the present application.

[0025]

Symbol Description

[0026] 1: electronic device;

[0027] 101: image capturing device;

[0028] 102: display device;

[0029] 1021: screen display layer;

[0030] 1022: screen touch layer;

[0031] 1023: transparent flat plate;

[0032] 1026: optical fingerprint recognition device;

[0033] 10, 20, 30, 40, 50, 60, 70, 80, 90: optical fingerprint recognition system; ​​

[0034] 11, 21, 31, 41, 51, 61, 71, 81, 91: base;

[0035] 12, 22, 32, 42, 52, 62, 72, 82, 92: photosensitive element;

[0036] 13, 33, 53, 73, 83, 93: condenser lens;

[0037] 13a, 33a, 53a, 73a, 83a, 93a: convex surface;

[0038] 23: super lens;

[0039] 43: collimating unit;

[0040] 431: tubular hole;

[0041] 432: light reflecting layer;

[0042] 63: chip-level lens group;

[0043] 63a: object side surface;

[0044] 63b: image side surface;

[0045] 34: condensing medium layer;

[0046] 541: light interference filter layer;

[0047] 542: light absorption filter layer;

[0048] 15, 25, 35, 45, 55, 65, 75, 85, 95: light emitting layer;

[0049] 151, 251, 351, 451, 551, 651, 751, 851, 951: screen unit;

[0050] 152, 252, 352, 452, 552, 652, 752, 852, 952: light emitting element;

[0051] 16, 26, 36, 46: touch layer;

[0052] 17, 27, 37, 47, 57, 67, 77, 87, 97: light path turning element;

[0053] 171, 271, 371, 471, 571, 671: wedge-shaped prism;

[0054] 171a, 271a, 371a, 471a, 571a, 671a: inclined surface;

[0055] 771: gradient refractive index element;

[0056] 871: first dielectric layer;

[0057] 872: second dielectric layer;

[0058] 873: turning inclined surface;

[0059] 971: Fresnel lens;

[0060] 971a: micro turning inclined surface;

[0061] 18, 28, 38, 48, 58, 68, 78, 88, 98: protective layer;

[0062] 69: light absorption layer;

[0063] FG: finger;

[0064] RG: ridge;

[0065] VL: valley;

[0066] CL: converging light ray;

[0067] RL: turning light ray;

[0068] SL: sensing light ray;

[0069] TFT1, TFT2, TFT3, TFT4, TFT5, TFT6, TFT7, TFT8, TFT9: thin film transistor structure;

[0070] X: first direction;

[0071] Y: second direction;

[0072] Z: stacking direction. DETAILED DESCRIPTION

[0073] The detailed features and advantages of the present application are described in the embodiments below, which are sufficient to enable any person skilled in the art to understand the technical content of the present application and to implement it, and according to the content disclosed in the specification, the scope of the patent application and the drawings, any person skilled in the art can easily understand the related purposes and advantages of the present application. The following examples further illustrate the ideas of the present application, but do not limit the scope of the present application in any way.

[0074] The present application provides an optical fingerprint recognition system, which includes a base, a photosensitive element, a light-emitting layer, and a protective layer. The photosensitive element is disposed above the base. The light-emitting layer is disposed above the photosensitive element, and the light-emitting layer includes a light-emitting element. The protective layer is disposed above the light-emitting layer. The optical fingerprint recognition system further includes a light path turning element between the photosensitive element and the protective layer. The light-emitting element is disposed in a side direction of the photosensitive element and the light path turning element, and the side direction is different from a stacking direction of the optical fingerprint recognition system. Through the above configuration, the residual image of the light-emitting element in the screen module can be avoided when capturing the fingerprint image, and the light path turning element can be used to turn the light path, which can effectively improve the fingerprint image quality, reduce the difficulty and time of fingerprint recognition, and improve the accuracy of recognition. The light path turning element refers to an element that can turn the light path to reduce the included angle between the light path and the normal direction of the photosensitive element.

[0075] The light path turning element can include a wedge prism. In this way, the function of turning the light path can be provided.

[0076] According to the optical fingerprint recognition system disclosed by the present application, a condensing lens can be further included, and the condensing lens is disposed above the photosensitive element and below the light path turning element. In this way, the optical path can be further shortened by using appropriate light transmission medium, so as to reduce the thickness of the device and facilitate the arrangement on the thin electronic device.

[0077] The optical fingerprint recognition system disclosed by the present application can further include a condensing medium layer, wherein the condensing medium layer is disposed below the condensing lens and above the photosensitive element. In this way, the coaxial requirement of the general condensing element can be avoided, and the difficulty of the overall process is further reduced.

[0078] The refractive index of the condensing medium layer is nA, which can satisfy the following condition: 1.60 < nA < 5.0. In this way, sufficient refractive power can be provided to shorten the total length of the optical path. The appropriate condensing medium layer material can be selected according to the requirements of condensing intensity and manufacturing difficulty, and the following condition can also be satisfied: nA = 1.62. The following condition can also be satisfied: nA = 1.77. The following condition can also be satisfied: nA = 2.01.

[0079] According to the optical fingerprint recognition system disclosed by the present application, a collimator unit can be further included, wherein the collimator unit is disposed above the photosensitive element and below the light path turning element, and the collimator unit has a plurality of tubular holes. In this way, the non-forward light can be received to effectively guide and adjust the light path, and the total light amount entering the photosensitive element can be increased to further improve the image quality of the fingerprint.

[0080] The collimating unit can include a plurality of light reflection layers, and each of the light reflection layers is respectively arranged around the inner wall of each of the tubular holes. In this way, the light reflection layers at the inner wall of the tubular holes can be used to reflect the non-forward light, thereby enhancing the reception of the non-forward light and improving the total light amount entering the photosensitive element.

[0081] According to the optical fingerprint recognition system, the optical interference filter layer and the light absorption filter layer can be arranged above the photosensitive element and below the light path turning element. The optical interference filter layer and the light absorption filter layer can be formed by two edge pass filter layers or general band pass filter layers. The optical interference filter layer and the light absorption filter layer can be configured by using a filter medium layer or a coating film on other light transmission elements. The optical interference filter layer can generate a filter bandwidth shift according to the incident light angle, and the light absorption filter layer can be a light transmission filter layer. By using the optical interference filter layer and the light absorption filter layer, light with a large incident angle can be filtered out to exclude image noise. The light transmission bandwidth of the light absorption filter layer can be visible light to near-infrared (NIR) light. Please refer to Figure 14 And Figure 15 , Figure 14 is a fold line graph showing the light wavelength band and transmission of the light passing through the optical interference filter layer and the light absorption filter layer when the light is irradiated at a normal incident angle (0-degree incident angle) according to an embodiment of the present application, Figure 15 is a fold line graph showing the light wavelength band and transmission of the light passing through the optical interference filter layer and the light absorption filter layer when the light is irradiated at a 45-degree incident angle according to an embodiment of the present application, wherein the horizontal axis of the graph is the wavelength of the light (unit: nanometer), and the vertical axis is the transmission of the light (unit: percentage). In Figure 14 And Figure 15 In the embodiments of Figure 14 And Figure 15 It can be known that the wavelength bands of the light passing through the optical interference filter layer and the light absorption filter layer will be different under different incident angles of the light. For details, please refer to Figure 14, light having a wavelength of about 850 nm (upper limit of the short pass) or less can pass through the optical interference filter layer when the light is normally incident, and light having a wavelength of about 800 nm (lower limit of the long pass) or more can pass through the optical absorption filter layer when the light is normally incident. That is, light having a wavelength of about 800 nm to about 850 nm (near-infrared light) can pass through the optical interference filter layer and the optical absorption filter layer when the light is normally incident. Next, please refer to Figure 15 , when the light is incident at an angle of 45 degrees, only light having a wavelength of about 760 nm or less can pass through the optical interference filter layer due to the excessively large incident angle, compared to Figure 14 , the wavelength band of light that can pass through the optical interference filter layer shifts to the left, i.e., the above-mentioned phenomenon of shifting of the filter wavelength band, and the wavelength band of light that can pass through the optical absorption filter layer remains unchanged when the light is incident at an angle of 45 degrees, compared to Figure 14 , the state of Figure 15 , the wavelength band of light that can pass through the optical interference filter layer and the wavelength band of light that can pass through the optical absorption filter layer do not overlap, so the light incident at an angle of 45 degrees cannot pass through the optical interference filter layer and the optical absorption filter layer. In this way, the above-mentioned effect of filtering light having an excessively large incident angle can be achieved.

[0082] The full width at half maximum (FWHM) of the wavelength band of light that can pass through the optical interference filter layer and the optical absorption filter layer satisfies the condition: FWHM < 100 (nm). In this way, the bandwidth of the light pass band can be limited to control the angle of the incident angle. The condition: FWHM < 50 (nm) can also be satisfied. In the present application, the wavelength interval of light that can pass through the optical interference filter layer and the wavelength interval of light that can pass through the optical absorption filter layer are the above-mentioned “wavelength band of light that can pass through the optical interference filter layer and the optical absorption filter layer” in the region where the two wavelength intervals overlap each other. If the above-mentioned Figure 14 embodiment is taken as an example, the “wavelength band of light that can pass through the optical interference filter layer and the optical absorption filter layer” is the light having a wavelength of about 800 nm to about 850 nm in Figure 14 , but the present application is not limited thereto.

[0083] The light path turning element can include a gradient refractive index element (GRIN). In this way, the function of turning the light path can be provided. The gradient refractive index element can be a radial gradient index lens.

[0084] The refractive index of the gradient refractive index element can decrease along a direction away from the light emitting element. In this way, the direction of the light path can be effectively controlled.

[0085] The maximum refractive index of the gradient refractive index element is Nmax, and the minimum refractive index of the gradient refractive index element is Nmin, which can satisfy the following condition: 1.2 < Nmax / Nmin < 4.5. In this way, the steering capability of the gradient refractive index element and the manufacturing difficulty are balanced.

[0086] The light path steering element can include at least two medium layers, a steering inclined surface is formed between two adjacent medium layers of the at least two medium layers, and the two adjacent medium layers of the at least two medium layers are connected to each other through the steering inclined surface. In this way, the light path steering function can be provided by using the medium difference and the size of the inclined angle.

[0087] The refractive index of the at least two medium layers can decrease along the direction away from the light emitting element, that is, the refractive index of the medium layer closest to the light emitting element is the largest, and the refractive index of the medium layer farthest from the light emitting element is the smallest. In this way, the light path can be effectively controlled to effectively improve the energy of the steered light.

[0088] The steering inclined surface can be a total reflection surface, and the total reflection effect can be achieved by configuring a medium difference or directly configuring a reflective medium coating on the inclined surface. In this way, the light path can be effectively controlled, and the total reflection surface is generated in cooperation with the inclined angle, the light energy loss caused by light penetration or refraction is reduced, and the energy of the steered light is further improved.

[0089] The light emitting element can be arranged in the same side direction of the light path steering element and the light sensing element. In this way, the light path steering element and the light sensing element can form an image recognition unit, which is beneficial to modularization. The light emitting element can also be arranged in the same side direction of the light path steering element, the condenser lens, and the light sensing element. In this way, the condenser lens can be included in the image recognition unit, and the completion of the module is improved.

[0090] The optical fingerprint recognition system disclosed by the present application can further include a wafer level lens assembly, and the wafer level lens assembly is arranged above the light sensing element and below the light path steering element. In this way, the condensing effect can be effectively provided, and the thickness of the optical fingerprint recognition system is further reduced.

[0091] The optical fingerprint recognition system disclosed by the present application can further include a meta lens, and the meta lens is arranged above the light sensing element and below the light path steering element. In this way, the condensing effect can be effectively provided, and the thickness of the optical fingerprint recognition system is further reduced.

[0092] The optical fingerprint recognition system can further include a light absorption layer surrounding an outer circumferential surface of the light path turning element. In this way, the light emitting element can be prevented from directly projecting excessive stray light onto the light path turning element.

[0093] The light path turning element and the light sensing element can be aligned with each other in a stacking direction of the optical fingerprint recognition system. That is, a normal projection of the light path turning element on the base overlaps a normal projection of the light sensing element on the base. In this way, the light sensing element can be sufficiently provided with forward light, which is beneficial to the response of the light sensing element.

[0094] The light emitting layer can further include a screen unit, wherein the screen unit includes the light emitting element, and the light emitting element is an organic light emitting diode (OLED). In this way, the overall thickness of the device can be reduced to achieve an under-screen fingerprint recognition system.

[0095] The light emitting element and the light sensing element can be connected to each other through a thin-film-transistor (TFT) structure. In this way, the light emitting element and the light sensing element can be turned on and off synchronously through the connection therebetween, so as to control the emission and capture of light, eliminate unnecessary stray light signals and crosstalk, and improve the accuracy of recognition. The plurality of light sensing elements can form an imaging element such as a complementary metal-oxide-semiconductor (CMOS). In this way, the light passing through the optical element can be imaged on the plurality of light sensing elements.

[0096] The light emitting element can be used to emit red light or green light. In this way, photoplethysmogram information can be provided to confirm that the recognized object is a living body.

[0097] The optical fingerprint recognition system can further include a touch layer, wherein the touch layer is located between the light path turning element and the light sensing element, and can be arranged above the light emitting layer, below the light emitting layer, or integrated into the structure of the light emitting layer. In this way, a touch function can be provided, and it can also be confirmed whether the recognized object is a living body fingerprint.

[0098] The light path turning element can include a Fresnel lens having a plurality of micro turning slopes, wherein each micro turning slope can correspond to a different field of view, and the inclination direction of the micro turning slope is substantially the same as the inclination direction of the inclined surface of the wedge-shaped prism included in the aforementioned light path turning element.

[0099] The present application provides an optical fingerprint recognition device, which includes a plurality of light emitting elements, a plurality of light path turning elements, and a plurality of light receiving elements. The light emitting elements are arranged at equal intervals in a first direction and a second direction, respectively, wherein the first direction is substantially perpendicular to the second direction. The light path turning elements are arranged above the light emitting elements in a stacking direction of the optical fingerprint recognition device, the light path turning elements are arranged at equal intervals in the first direction, and each of the light path turning elements is located between two adjacent light emitting elements in the first direction, wherein the stacking direction is substantially perpendicular to the first direction and the second direction. The light receiving elements are arranged below the light emitting elements in the stacking direction, the light receiving elements are arranged at equal intervals in the first direction, and each of the light receiving elements is located between two adjacent light emitting elements in the first direction. Through the above optical configuration, the volume of the optical fingerprint recognition device can be reduced, and the optical fingerprint recognition device can be easily integrated into the current screen process.

[0100] The light path turning elements and the light receiving elements can be aligned with each other in the stacking direction of the optical fingerprint recognition device, that is, the light path turning elements overlap the light receiving elements in the stacking direction. In this way, the light receiving elements can be fully provided with forward light, which is beneficial to the response of the light receiving elements.

[0101] The optical fingerprint recognition device disclosed by the present application can further include a collimating layer, wherein the collimating layer is arranged above the light receiving elements and below the light path turning elements, and the collimating layer has a plurality of tubular holes. In this way, non-forward light can be received to effectively guide and adjust the light path, and the total light amount entering the light receiving elements can be increased, so as to further improve the image quality of the fingerprint.

[0102] The technical features of the optical fingerprint recognition system and the optical fingerprint recognition device described above can be combined to achieve the corresponding effects.

[0103] According to the above embodiments, specific embodiments are proposed below and are described in detail with reference to the accompanying drawings.

[0104] <First embodiment>

[0105] Please refer to Figure 1Fig. 1 is a schematic diagram illustrating an optical fingerprint recognition system according to a first embodiment of the present application. In the present embodiment, the optical fingerprint recognition system 10 comprises a base 11, a photosensitive element 12, a condenser lens 13, a light-emitting layer 15, a touch layer 16, a light path turning element 17, and a protective layer 18. The photosensitive element 12 is disposed above the base 11 in a stacking direction Z. The condenser lens 13 is disposed above the photosensitive element 12 in the stacking direction Z. The light-emitting layer 15 is disposed above the photosensitive element 12 and the condenser lens 13 in the stacking direction Z. The touch layer 16 is disposed above the light-emitting layer 15 in the stacking direction Z. The light path turning element 17 is disposed above the photosensitive element 12, the condenser lens 13, the light-emitting layer 15, and the touch layer 16 in the stacking direction Z, such that the touch layer 16 is located between the photosensitive element 12 and the light path turning element 17. The protective layer 18 is disposed above the light-emitting layer 15 and the light path turning element 17 in the stacking direction Z.

[0106] Specifically, the condenser lens 13 is located above the photosensitive element 12 and below the light path turning element 17. The condenser lens 13 has a convex surface 13a facing the light path turning element 17 in the stacking direction Z.

[0107] The light-emitting layer 15 comprises a screen unit 151, and the screen unit 151 comprises a light-emitting element 152. The light-emitting element 152 is disposed on one side edge direction of the photosensitive element 12, the condenser lens 13, and the light path turning element 17, and the side edge direction is different from the stacking direction Z. Specifically, the light-emitting element 152 is disposed on the same side of the photosensitive element 12, the condenser lens 13, and the light path turning element 17 in a first direction X, wherein the first direction X is the same as the side edge direction.

[0108] The light-emitting element 152 is, for example, an organic light-emitting diode, and can serve as a light source to emit red light or green light. The light-emitting element 152 is connected to the base 11 through a thin film transistor structure TFT1, and the light-emitting element 152 is indirectly connected to the photosensitive element 12 through the thin film transistor structure TFT1 and the base 11.

[0109] The light path turning element 17 is located between the photosensitive element 12 and the protective layer 18. The light path turning element 17 and the photosensitive element 12 are aligned with each other in the stacking direction Z; that is, the light path turning element 17 overlaps the photosensitive element 12 in the orthographic projection on the base 11. The light path turning element 17 comprises a wedge-shaped prism 171. The wedge-shaped prism 171 has an inclined surface 171a facing the protective layer 18 in the stacking direction Z.

[0110] When the user's finger FG is placed on the protective layer 18, the light emitting element 152 can emit a sensing light ray SL toward the finger FG. The finger FG has a fingerprint pattern thereon, and the surface of the finger FG has valley portions VL and ridge portions RG. The sensing light ray SL can be reflected at the valley portions VL and the ridge portions RG (for the sake of convenience, in this embodiment and all of the embodiments described below, the drawing only shows the sensing light ray SL being reflected at the ridge portions RG), become a turning light ray RL after passing through the inclined surface 171a of the wedge-shaped prism 171, where the angle between the turning light ray RL and the normal direction (not shown, i.e., the stacking direction Z) of the light sensing element 12 is smaller than the angle between the sensing light ray SL and the normal direction of the light sensing element 12. Then, the turning light ray RL is conducted to the convex surface 13a of the condenser lens 13 and becomes a converging light ray CL that is directed toward the light sensing element 12. The converging light ray CL is imaged on the light sensing element 12 to transmit information to a processor (not shown separately) and is interpreted after integrating the images generated by a plurality of units of the optical fingerprint recognition system.

[0111] [Second Embodiment]

[0112] Please refer to Figure 2 is a schematic diagram illustrating an optical fingerprint recognition system according to a second embodiment of the present application. In this embodiment, the optical fingerprint recognition system 20 includes a base 21, a light sensing element 22, a super lens 23, a light emitting layer 25, a touch layer 26, a light path turning element 27, and a protective layer 28. The light sensing element 22 is disposed above the base 21 in the stacking direction Z. The super lens 23 is disposed above the light sensing element 22 in the stacking direction Z. The light emitting layer 25 is disposed above the light sensing element 22 and the super lens 23 in the stacking direction Z. The touch layer 26 is integrated into the structure of the light emitting layer 25 and is located in the same layer as the light emitting layer 25. The light path turning element 27 is disposed above the light sensing element 22, the super lens 23, the light emitting layer 25, and the touch layer 26 in the stacking direction Z, such that the touch layer 26 is located between the light sensing element 22 and the light path turning element 27. The protective layer 28 is disposed above the light emitting layer 25 and the light path turning element 27 in the stacking direction Z.

[0113] Specifically, the super lens 23 is located above the light sensing element 22 and below the light path turning element 27.

[0114] The light emitting layer 25 includes a screen unit 251, and the screen unit 251 includes a light emitting element 252. The light emitting element 252 is disposed on one side edge direction of the light sensing element 22, the super lens 23, and the light path turning element 27, and the side edge direction is different from the stacking direction Z. Specifically, the light emitting element 252 is disposed on the same side of the light sensing element 22, the super lens 23, and the light path turning element 27 in a first direction X, where the first direction X is the same as the side edge direction.

[0115] The light emitting element 252 is, for example, an organic light emitting diode, and can serve as a light source to emit red or green light. The light emitting element 252 is connected to the base 21 through a thin film transistor structure TFT2, and is indirectly connected to the light receiving element 22 through the thin film transistor structure TFT2 and the base 21.

[0116] The light path turning element 27 is located between the light receiving element 22 and the protective layer 28. The light path turning element 27 is aligned with the light receiving element 22 in the stacking direction Z; that is, the orthographic projection of the light path turning element 27 on the base 21 overlaps the orthographic projection of the light receiving element 22 on the base 21. The light path turning element 27 includes a wedge-shaped prism 271. The wedge-shaped prism 271 has a slope 271a facing the protective layer 28 in the stacking direction Z.

[0117] When the user's finger FG is placed on the protective layer 28, the light emitting element 252 can emit a sensing light SL toward the finger FG. The finger FG has a fingerprint pattern, and the surface of the finger FG has valleys VL and ridges RG. The sensing light SL can be reflected at the valleys VL and the ridges RG, and become a turning light RL after passing through the slope 271a of the wedge-shaped prism 271, where the angle between the turning light RL and the normal direction (not shown, i.e., the stacking direction Z) of the light receiving element 22 is smaller than the angle between the sensing light SL and the normal direction of the light receiving element 22. Then, the turning light RL is conducted to the super-lens 23 and becomes a converging light CL that is directed toward the light receiving element 22. The converging light CL is imaged on the light receiving element 22 to transmit information to a processor (not shown separately), and is interpreted after integrating the images generated by a plurality of units of optical fingerprint recognition systems.

[0118] <Third Embodiment>

[0119] Please refer to Figure 3FIG. 3 is a schematic diagram illustrating an optical fingerprint recognition system according to a third embodiment of the present application. In this embodiment, the optical fingerprint recognition system 30 includes a base 31, a photosensitive element 32, a light-concentrating medium layer 34, a light-concentrating lens 33, a touch layer 36, a light-emitting layer 35, a light path turning element 37, and a protective layer 38. The photosensitive element 32 is disposed above the base 31 in a stacking direction Z. The light-concentrating lens 33 is disposed above the photosensitive element 32 in the stacking direction Z. The light-concentrating medium layer 34 is disposed above the photosensitive element 32 and below the light-concentrating lens 33 in the stacking direction Z. The light-emitting layer 35 is disposed above the photosensitive element 32 and the light-concentrating lens 33 in the stacking direction Z. The touch layer 36 is disposed above the light-concentrating lens 33 and below the light-emitting layer 35 in the stacking direction Z. The light path turning element 37 is disposed above the photosensitive element 32, the light-concentrating lens 33, the touch layer 36, and the light-emitting layer 35 in the stacking direction Z, such that the touch layer 36 is located between the photosensitive element 32 and the light path turning element 37. The protective layer 38 is disposed above the light-emitting layer 35 and the light path turning element 37 in the stacking direction Z.

[0120] Specifically, the light-concentrating lens 33 is located above the photosensitive element 32 and below the light path turning element 37. The light-concentrating lens 33 has a convex surface 33a facing the light path turning element 37 in the stacking direction Z.

[0121] The light-concentrating medium layer 34 has a fixing structure (not labeled) at an outer circumferential surface thereof, which can fix the light-concentrating medium layer 34. The light-concentrating medium layer 34 has a refractive index nA, which satisfies the following conditions: nA = 1.62; nA = 1.77; or nA = 2.01.

[0122] The light-emitting layer 35 includes a screen unit 351, and the screen unit 351 includes a light-emitting element 352. The light-emitting element 352 is disposed on one side edge direction of the photosensitive element 32, the light-concentrating lens 33, and the light path turning element 37, and the side edge direction is different from the stacking direction Z. Specifically, the light-emitting element 352 is disposed on the same side of the photosensitive element 32, the light-concentrating lens 33, and the light path turning element 37 in a first direction X, wherein the first direction X is the same as the side edge direction.

[0123] The light-emitting element 352 is, for example, an organic light-emitting diode, and can serve as a light source to emit red light or green light. The light-emitting element 352 and the base 31 are connected to each other through a thin film transistor structure TFT3, and the light-emitting element 352 is indirectly connected to the photosensitive element 32 through the thin film transistor structure TFT3 and the base 31.

[0124] The light path turning element 37 is located between the light sensing element 32 and the protective layer 38. The light path turning element 37 and the light sensing element 32 are aligned with each other in the stacking direction Z; that is, the light path turning element 37 overlaps the light sensing element 32 in the orthographic projection of the base 31. The light path turning element 37 comprises a wedge prism 371. The wedge prism 371 has a slope 371a facing the protective layer 38 in the stacking direction Z.

[0125] When the user's finger FG is placed on the protective layer 38, the light emitting element 352 can emit a sensing light ray SL toward the finger FG. The finger FG has a fingerprint pattern thereon, and the surface of the finger FG has valleys VL and ridges RG. The sensing light ray SL can be reflected at the valleys VL and the ridges RG, pass through the slope 371a of the wedge prism 371 to become a turning light ray RL, wherein the angle between the turning light ray RL and the normal direction (not shown, i.e., the stacking direction Z) of the light sensing element 32 is smaller than the angle between the sensing light ray SL and the normal direction of the light sensing element 32. Then, the turning light ray RL passes through the convex surface 33a of the condenser lens 33, passes through the condensing medium layer 34 to become a converging light ray CL directed toward the light sensing element 32. The converging light ray CL is imaged on the light sensing element 32 to transmit information to a processor (not shown separately), and the images generated by a plurality of units of the optical fingerprint recognition system are integrated to be interpreted.

[0126] <Fourth Embodiment>

[0127] Please refer to Figures 4a-4b , Figure 4a is a schematic diagram illustrating an optical fingerprint recognition system according to the fourth embodiment of the present application, and Figure 4b is a top view illustrating a collimating unit of the optical fingerprint recognition system of Figure 4a In this embodiment, the optical fingerprint recognition system 40 comprises a base 41, a light sensing element 42, a collimating unit 43, a light emitting layer 45, a touch layer 46, a light path turning element 47, and a protective layer 48. The light sensing element 42 is disposed above the base 41 in the stacking direction Z. The collimating unit 43 is disposed above the light sensing element 42 in the stacking direction Z. The light emitting layer 45 is disposed above the light sensing element 42 and the collimating unit 43 in the stacking direction Z. The touch layer 46 is disposed above the light emitting layer 45 in the stacking direction Z. The light path turning element 47 is disposed above the light sensing element 42, the collimating unit 43, the light emitting layer 45, and the touch layer 46 in the stacking direction Z, such that the touch layer 46 is located between the light sensing element 42 and the light path turning element 47. The protective layer 48 is disposed above the light emitting layer 45 and the light path turning element 47 in the stacking direction Z.

[0128] Specifically, the collimating unit 43 is located above the light sensing element 42 and below the light path turning element 47. Please refer to Figure 4bFig. 4 is a perspective view of the collimating unit 43, as viewed from the stacking direction Z. The collimating unit 43 has a plurality of tubular holes 431 and a plurality of light reflecting layers 432. Each light reflecting layer 432 surrounds the inner wall of each tubular hole 431 with a line segment parallel to the stacking direction Z and passing through the geometric center of each tubular hole 431 as an axis. Figure 4b As can be seen, the collimating unit 43 has a plurality of tubular holes 431 and a plurality of light reflecting layers 432. Each light reflecting layer 432 surrounds the inner wall of each tubular hole 431 with a line segment parallel to the stacking direction Z and passing through the geometric center of each tubular hole 431 as an axis.

[0129] The light emitting layer 45 includes a screen unit 451, and the screen unit 451 includes a light emitting element 452. The light emitting element 452 is disposed on the side edge direction of the light sensing element 42, the collimating unit 43 and the light path turning element 47, and the side edge direction is different from the stacking direction Z. Specifically, the light emitting element 452 is disposed on the same side of the light sensing element 42, the collimating unit 43 and the light path turning element 47 in the first direction X, wherein the first direction X is the same as the side edge direction.

[0130] The light emitting element 452 is, for example, an organic light emitting diode, and can serve as a light source to emit red light or green light. The light emitting element 452 is connected to the base 41 through a thin film transistor structure TFT4, and the light emitting element 452 is indirectly connected to the light sensing element 42 through the thin film transistor structure TFT4 and the base 41.

[0131] The light path turning element 47 is located between the light sensing element 42 and the protective layer 48. The light path turning element 47 and the light sensing element 42 are aligned with each other in the stacking direction Z; that is, the orthographic projection of the light path turning element 47 on the base 41 overlaps the orthographic projection of the light sensing element 42 on the base 41. The light path turning element 47 includes a wedge-shaped prism 471. The wedge-shaped prism 471 has a slope 471a facing the protective layer 48 in the stacking direction Z.

[0132] When the user's finger FG is placed on the protective layer 48, the light emitting element 452 can emit sensing light SL to the finger FG. The finger FG has a fingerprint pattern, and the surface of the finger FG has valleys VL and ridges RG. The sensing light SL can be reflected in the valleys VL and the ridges RG, and after passing through the slope 471a of the wedge-shaped prism 471, it becomes a turning light RL, wherein the angle between the turning light RL and the normal direction of the light sensing element 42 (not shown, i.e. the stacking direction Z) is smaller than the angle between the sensing light SL and the normal direction of the light sensing element 42. Then, the turning light RL is conducted to the collimating unit 43, reflected by the light reflecting layer 432 of the inner wall of the tubular hole 431 and directed to the light sensing element 42 to transmit information to a processor (not shown separately), and after integrating the images generated by a plurality of units of optical fingerprint recognition systems, it is interpreted.

[0133] <5th Embodiment>

[0134] Please refer to Figure 5FIG. 5 is a schematic diagram illustrating an optical fingerprint recognition system according to a fifth embodiment of the present disclosure. In this embodiment, the optical fingerprint recognition system 50 includes a base 51, a photosensitive element 52, a condenser lens 53, a light interference filter layer 541, a light absorption filter layer 542, a light-emitting layer 55, a light path turning element 57, and a protective layer 58. The photosensitive element 52 is disposed above the base 51 in a stacking direction Z. The condenser lens 53 is disposed above the photosensitive element 52 in the stacking direction Z. The light interference filter layer 541 and the light absorption filter layer 542 are disposed above the photosensitive element 52 and the condenser lens 53. The light-emitting layer 55 is disposed above the photosensitive element 52, the condenser lens 53, the light interference filter layer 541, and the light absorption filter layer 542 in the stacking direction Z. The light path turning element 57 is disposed above the photosensitive element 52, the condenser lens 53, and the light-emitting layer 55 in the stacking direction Z. The protective layer 58 is disposed above the light-emitting layer 55 and the light path turning element 57 in the stacking direction Z.

[0135] Specifically, the condenser lens 53 is located above the photosensitive element 52 and below the light path turning element 57. The condenser lens 53 has a convex surface 53a facing the photosensitive element 52 in the stacking direction Z.

[0136] The light interference filter layer 541 and the light absorption filter layer 542 are located above the photosensitive element 52 and below the light path turning element 57, and the light absorption filter layer 542 is disposed between the light interference filter layer 541 and the condenser lens 53. The light interference filter layer 541 and the light absorption filter layer 542 have a fixing structure (not labeled separately) at the outer circumferential surface thereof, which can fix the light interference filter layer 541 and the light absorption filter layer 542. The light absorption filter layer 542 is a light-passing filter, and the light-passing wavelength band of the light absorption filter layer 542 is visible light to near-infrared light.

[0137] The full width at half maximum (FWHM) of the wavelength band of the light passing through the light interference filter layer 541 and the light absorption filter layer 542 satisfies the following condition: FWHM = 10 (nm); or FWHM = 40 (nm).

[0138] The light-emitting layer 55 includes a screen unit 551, and the screen unit 551 includes a light-emitting element 552. The light-emitting element 552 is disposed on one side edge direction of the photosensitive element 52, the condenser lens 53, and the light path turning element 57, and the side edge direction is different from the stacking direction Z. Specifically, the light-emitting element 552 is disposed on the same side of the photosensitive element 52, the condenser lens 53, and the light path turning element 57 in a first direction X, wherein the first direction X is the same as the side edge direction.

[0139] The light emitting element 552 is, for example, an organic light emitting diode, and can serve as a light source to emit red or green light. The light emitting element 552 is connected to the base 51 through a thin film transistor structure TFT5, and is indirectly connected to the light receiving element 52 through the thin film transistor structure TFT5 and the base 51.

[0140] The light path turning element 57 is located between the light receiving element 52 and the protective layer 58. The light path turning element 57 is aligned with the light receiving element 52 in the stacking direction Z; that is, the light path turning element 57 is superimposed on the light receiving element 52 in the orthographic projection onto the base 51. The light path turning element 57 includes a wedge-shaped prism 571. The wedge-shaped prism 571 has a slope 571a facing the protective layer 58 in the stacking direction Z.

[0141] When the user's finger FG is placed on the protective layer 58, the light emitting element 552 can emit a sensing light ray SL toward the finger FG. The finger FG has a fingerprint pattern, and the surface of the finger FG has a valley VL and a ridge RG. The sensing light ray SL can be reflected at the valley VL and the ridge RG, pass through the slope 571a of the wedge-shaped prism 571 to become a turning light ray RL, where the angle between the turning light ray RL and the normal direction (not shown, i.e., the stacking direction Z) of the light receiving element 52 is smaller than the angle between the sensing light ray SL and the normal direction of the light receiving element 52. Then, the turning light ray RL is conducted and sequentially passes through the light interference filter layer 541, the light absorption filter layer 542, and the convex surface 53a of the condenser lens 53 to become a converging light ray CL directed toward the light receiving element 52. The converging light ray CL is imaged on the light receiving element 52 to transmit information to a processor (not shown separately), and is interpreted after integrating the images generated by a plurality of units of the optical fingerprint recognition system.

[0142] <Sixth Embodiment>

[0143] Please refer to Figure 6 is a schematic diagram illustrating an optical fingerprint recognition system according to a sixth embodiment of the present application. In this embodiment, the optical fingerprint recognition system 60 includes a base 61, a light receiving element 62, a chip-level lens group 63, a light emitting layer 65, a light path turning element 67, and a protective layer 68. The light receiving element 62 is disposed above the base 61 in the stacking direction Z. The chip-level lens group 63 is disposed above the light receiving element 62 in the stacking direction Z. The light emitting layer 65 is disposed above the light receiving element 62 and the chip-level lens group 63 in the stacking direction Z. The light path turning element 67 is disposed above the light receiving element 62, the chip-level lens group 63, and the light emitting layer 65 in the stacking direction Z. The protective layer 68 is disposed above the light emitting layer 65 and the light path turning element 67 in the stacking direction Z.

[0144] Specifically, the chip-level lens group 63 is located above the photosensitive element 62 and below the light path turning element 67. The chip-level lens group 63 includes a plurality of chip-level lenses (not labeled separately). The chip-level lenses have object-side surfaces 63a facing the light path turning element 67 and image-side surfaces 63b facing the photosensitive element 62 in the stacking direction Z.

[0145] The light-emitting layer 65 includes a screen unit 651, and the screen unit 651 includes a light-emitting element 652. The light-emitting element 652 is disposed in a side direction of the photosensitive element 62, the chip-level lens group 63, and the light path turning element 67, which is different from the stacking direction Z. Specifically, the light-emitting element 652 is disposed on the same side of the photosensitive element 62, the chip-level lens group 63, and the light path turning element 67 in the first direction X, which is the same as the side direction.

[0146] The light-emitting element 652 is, for example, an organic light-emitting diode, and can serve as a light source to emit red light or green light. The light-emitting element 652 is connected to the base 61 through a thin film transistor structure TFT6, and is indirectly connected to the photosensitive element 62 through the thin film transistor structure TFT6 and the base 61.

[0147] The light path turning element 67 is located between the photosensitive element 62 and the protective layer 68. The light path turning element 67 and the photosensitive element 62 are aligned with each other in the stacking direction Z; that is, the orthographic projection of the light path turning element 67 on the base 61 overlaps the orthographic projection of the photosensitive element 62 on the base 61. The light path turning element 67 includes a wedge prism 671. The wedge prism 671 has an inclined surface 671a facing the protective layer 68 in the stacking direction Z.

[0148] The optical fingerprint recognition system 60 further includes a light-absorbing layer 69. The light-absorbing layer 69 surrounds the outer circumferential surface of the light path turning element 67 with a line segment parallel to the stacking direction Z and passing through the wedge prism 671 as an axis.

[0149] When the user's finger FG is placed on the protection layer 68, the light emitting element 652 can emit a sensing light ray SL toward the finger FG. The finger FG has a fingerprint pattern thereon, and the surface of the finger FG has valley portions VL and ridge portions RG. The sensing light ray SL can be reflected at the valley portions VL and the ridge portions RG to become a turning light ray RL through the inclined surface 671a of the wedge-shaped prism 671, where the angle between the turning light ray RL and the normal direction (not shown, i.e., the stacking direction Z) of the light sensing element 62 is smaller than the angle between the sensing light ray SL and the normal direction of the light sensing element 62. Then, the turning light ray RL is conducted to the object side surface 63a and the image side surface 63b of the chip-level lens group 63 and becomes a converging light ray CL toward the light sensing element 62. The converging light ray CL is imaged on the light sensing element 62 to transmit information to a processor (not shown separately) and is interpreted after integrating the images generated by a plurality of units of the optical fingerprint recognition system.

[0150] <Seventh Embodiment>

[0151] Please refer to Figure 7 is a schematic diagram illustrating an optical fingerprint recognition system according to a seventh embodiment of the present application. In the present embodiment, the optical fingerprint recognition system 70 includes a base 71, a light sensing element 72, a condenser lens 73, a light emitting layer 75, a light path turning element 77, and a protection layer 78. The light sensing element 72 is disposed above the base 71 in the stacking direction Z. The condenser lens 73 is disposed above the light sensing element 72 in the stacking direction Z. The light emitting layer 75 is disposed above the light sensing element 72 and the condenser lens 73 in the stacking direction Z. The light path turning element 77 is disposed above the light sensing element 72, the condenser lens 73, and the light emitting layer 75 in the stacking direction Z. The protection layer 78 is disposed above the light emitting layer 75 and the light path turning element 77 in the stacking direction Z.

[0152] Specifically, the condenser lens 73 is located above the light sensing element 72 and below the light path turning element 77. The condenser lens 73 has a convex surface 73a facing the light path turning element 77 in the stacking direction Z.

[0153] The light emitting layer 75 includes a screen unit 751, and the screen unit 751 includes a light emitting element 752. The light emitting element 752 is disposed on one side edge direction of the light sensing element 72, the condenser lens 73, and the light path turning element 77, and the side edge direction is different from the stacking direction Z. Specifically, the light emitting element 752 is disposed on the same side of the light sensing element 72, the condenser lens 73, and the light path turning element 77 in a first direction X, where the first direction X is the same as the side edge direction.

[0154] The light emitting element 752 is, for example, an organic light emitting diode, and can be a light source to emit red or green light. The light emitting element 752 is connected to the base 71 through a thin film transistor structure TFT7, and is indirectly connected to the light receiving element 72 through the thin film transistor structure TFT7 and the base 71.

[0155] The light path turning element 77 is located between the light receiving element 72 and the protective layer 78. The light path turning element 77 is aligned with the light receiving element 72 in the stacking direction Z; that is, the light path turning element 77 is overlapped with the light receiving element 72 in the orthographic projection of the base 71. The light path turning element 77 includes a gradient refractive index element 771, and further includes a fixing structure (not labeled separately) at the outer circumferential surface of the gradient refractive index element 771 to fix the gradient refractive index element 771. The refractive index of the gradient refractive index element 771 decreases along the direction away from the light emitting element 752 (i.e., the negative X direction). Please refer to the gradient refractive index element 771 in Figure 7 The density of the dots represents the refractive index of the gradient refractive index element 771, and the denser the dots are, the greater the refractive index of the gradient refractive index element 771 is, and the sparser the dots are, the smaller the refractive index of the gradient refractive index element 771 is.

[0156] The maximum refractive index of the gradient refractive index element 771 is Nmax, and the minimum refractive index of the gradient refractive index element 771 is Nmin, which satisfy the following conditions: Nmax / Nmin = 1.5; Nmax / Nmin = 2; or Nmax / Nmin = 4.

[0157] When the user's finger FG is placed on the protective layer 78, the light emitting element 752 can emit a sensing light SL toward the finger FG. The finger FG has a fingerprint pattern, and the surface of the finger FG has a valley VL and a ridge RG. The sensing light SL can be reflected at the valley VL and the ridge RG, and gradually turned into a turning light RL when passing through the gradient refractive index element 771, wherein the included angle between the turning light RL and the normal direction (not shown, i.e., the stacking direction Z) of the light receiving element 72 is smaller than the included angle between the sensing light SL and the normal direction of the light receiving element 72. Then, the turning light RL is conducted to the convex surface 73a of the condenser lens 73 and becomes a converging light CL directed to the light receiving element 72. The converging light CL is imaged on the light receiving element 72 to transmit information to a processor (not shown separately), and the images generated by a plurality of units of optical fingerprint recognition systems are integrated to be interpreted.

[0158] <Eighth Embodiment>

[0159] Please refer to Figure 8FIG. 8 is a schematic diagram illustrating an optical fingerprint recognition system according to an eighth embodiment of the present disclosure. In this embodiment, the optical fingerprint recognition system 80 includes a base 81, a photosensitive element 82, a condenser lens 83, a light-emitting layer 85, a light path turning element 87, and a protective layer 88. The photosensitive element 82 is disposed above the base 81 in the stacking direction Z. The condenser lens 83 is disposed above the photosensitive element 82 in the stacking direction Z. The light-emitting layer 85 is disposed above the photosensitive element 82 and the condenser lens 83 in the stacking direction Z. The light path turning element 87 is disposed above the photosensitive element 82, the condenser lens 83, and the light-emitting layer 85 in the stacking direction Z. The protective layer 88 is disposed above the light-emitting layer 85 and the light path turning element 87 in the stacking direction Z.

[0160] Specifically, the condenser lens 83 is located above the photosensitive element 82 and below the light path turning element 87. The condenser lens 83 has a convex surface 83a facing the light path turning element 87 in the stacking direction Z.

[0161] The light-emitting layer 85 includes a screen unit 851, and the screen unit 851 includes a light-emitting element 852. The light-emitting element 852 is disposed on one side edge direction of the photosensitive element 82, the condenser lens 83, and the light path turning element 87, and the side edge direction is different from the stacking direction Z. Specifically, the light-emitting element 852 is disposed on the same side of the photosensitive element 82, the condenser lens 83, and the light path turning element 87 in the first direction X, where the first direction X is the same as the side edge direction.

[0162] The light-emitting element 852 is, for example, an organic light-emitting diode, and can serve as a light source to emit red light or green light. The light-emitting element 852 is connected to the base 81 through a thin film transistor structure TFT8, and the light-emitting element 852 is indirectly connected to the photosensitive element 82 through the thin film transistor structure TFT8 and the base 81.

[0163] The light path turning element 87 is located between the light sensing element 82 and the protective layer 88. The light path turning element 87 and the light sensing element 82 are aligned with each other in the stacking direction Z; that is, the orthographic projection of the light path turning element 87 on the base 81 overlaps the orthographic projection of the light sensing element 82 on the base 81. The light path turning element 87 comprises at least two dielectric layers. Specifically, the light path turning element 87 comprises a first dielectric layer 871 and a second dielectric layer 872 adjacent to each other, and further comprises a fixing structure (not labeled separately) at the outer circumferential surface of the first dielectric layer 871 and the second dielectric layer 872, which can fix the first dielectric layer 871 and the second dielectric layer 872. A turning inclined surface 873 is formed between the first dielectric layer 871 and the second dielectric layer 872. The first dielectric layer 871 and the second dielectric layer 872 are connected to each other through the turning inclined surface 873, wherein the turning inclined surface 873 forms an angle with the stacking direction Z. The refractive index of the first dielectric layer 871 and the second dielectric layer 872 decreases in the direction away from the light emitting element 852 (i.e., the negative X direction). Specifically, the refractive index of the first dielectric layer 871 is greater than the refractive index of the second dielectric layer 872, and a total reflection surface is formed on the turning inclined surface 873.

[0164] When the user's finger FG is placed on the protective layer 88, the light emitting element 852 can emit sensing light SL toward the finger FG. The finger FG has fingerprint lines, and the surface of the finger FG has valleys VL and ridges RG. The sensing light SL can be reflected on the valleys VL and the ridges RG, and after passing through the first dielectric layer 871, the sensing light SL is totally reflected by the turning inclined surface 873 to become turning light RL, wherein the angle between the turning light RL and the normal direction of the light sensing element 82 (not shown, i.e., the stacking direction Z) is smaller than the angle between the sensing light SL and the normal direction of the light sensing element 82. Then, the turning light RL is conducted to the convex surface 83a of the condenser lens 83 and becomes converging light CL directed to the light sensing element 82. The converging light CL is imaged on the light sensing element 82 to transmit information to a processor (not shown separately), and after integrating the images generated by a plurality of unit optical fingerprint recognition systems, the information is interpreted.

[0165] <Embodiment 9>

[0166] Please refer to Figure 9FIG. 9 is a schematic diagram illustrating an optical fingerprint recognition system according to a ninth embodiment of the present application. In this embodiment, the optical fingerprint recognition system 90 includes a base 91, a photosensitive element 92, a condenser lens 93, a light-emitting layer 95, a light path turning element 97, and a protective layer 98. The photosensitive element 92 is disposed above the base 91 in the stacking direction Z. The condenser lens 93 is disposed above the photosensitive element 92 in the stacking direction Z. The light-emitting layer 95 is disposed above the photosensitive element 92 and the condenser lens 93 in the stacking direction Z. The light path turning element 97 is disposed above the photosensitive element 92, the condenser lens 93, and the light-emitting layer 95 in the stacking direction Z. The protective layer 98 is disposed above the light-emitting layer 95 and the light path turning element 97 in the stacking direction Z.

[0167] Specifically, the condenser lens 93 is located above the photosensitive element 92 and below the light path turning element 97. The condenser lens 93 has a convex surface 93a facing the photosensitive element 92 in the stacking direction Z.

[0168] The light-emitting layer 95 includes a screen unit 951, and the screen unit 951 includes a light-emitting element 952. The light-emitting element 952 is disposed on one side edge direction of the photosensitive element 92, the condenser lens 93, and the light path turning element 97, and the side edge direction is different from the stacking direction Z. Specifically, the light-emitting element 952 is disposed on the same side of the photosensitive element 92, the condenser lens 93, and the light path turning element 97 in the first direction X, where the first direction X is the same as the side edge direction.

[0169] The light-emitting element 952 is, for example, an organic light-emitting diode, and can serve as a light source to emit red light or green light. The light-emitting element 952 is connected to the base 91 through a thin film transistor structure TFT9, and the light-emitting element 952 is indirectly connected to the photosensitive element 92 through the thin film transistor structure TFT9 and the base 91.

[0170] The light path turning element 97 is located between the photosensitive element 92 and the protective layer 98. The light path turning element 97 and the photosensitive element 92 are aligned with each other in the stacking direction Z; that is, the light path turning element 97 is orthogonally projected on the photosensitive element 92 on the base 91. The light path turning element 97 includes a Fresnel lens 971. The Fresnel lens 971 has a plurality of micro turning slopes 971a in the stacking direction Z, where each micro turning slope 971a faces the protective layer 98, and the inclination direction of each micro turning slope 971a is substantially the same as the inclination direction of the slope 171a-671a of the wedge-shaped prism 171-671 in the first to sixth embodiments.

[0171] When the user's finger FG is placed on the protective layer 98, the light emitting element 952 can emit a sensing light ray SL toward the finger FG. The finger FG has a fingerprint pattern thereon, and the surface of the finger FG has valley portions VL and ridge portions RG. The sensing light ray SL can be reflected at the valley portions VL and the ridge portions RG, and after passing through the micro turning facets 971a of the Fresnel lens 971, becomes a turning light ray RL, where the angle between the turning light ray RL and the normal direction (not shown, i.e., the stacking direction Z) of the light sensing element 92 is smaller than the angle between the sensing light ray SL and the normal direction of the light sensing element 92. Then, the turning light ray RL is conducted to the convex surface 93a of the condenser lens 93 and becomes a converging light ray CL directed toward the light sensing element 92. The converging light ray CL is imaged on the light sensing element 92 to transmit information to a processor (not shown separately), and after integrating the images generated by a plurality of units of the optical fingerprint recognition system, the information is interpreted.

[0172] <10th Embodiment>

[0173] Please refer to Figure 10 and Figure 11 wherein Figure 10 a schematic diagram of an application of an optical fingerprint recognition device according to the 10th embodiment of the present application is shown, and Figure 11 a schematic diagram of the optical fingerprint recognition device of Figure 10 identifying a fingerprint is shown.

[0174] In this embodiment, the electronic device 1 is a smart phone with a biometric recognition function. The electronic device 1 comprises an image capturing device 101 and a display device 102. The image capturing device 101 is used as a front camera of the electronic device 1 to provide a selfie function. The display device 102 comprises a screen display layer 1021, a screen touch layer 1022, and a transparent flat plate 1023. The screen display layer 1021 can display images. The screen display layer 1021 can employ OLED or active-matrix organic light-emitting diode (AMOLED). The screen touch layer 1022 is disposed above the screen display layer 1021. The screen touch layer 1022 can have the function of a touch screen, so that an additional input device can be omitted and the operation can be more intuitive. The transparent flat plate 1023 is disposed above the screen touch layer 1022. The transparent flat plate 1023 can provide a protective function, so that the use of additional elements is reduced. In addition, the display device 102 further comprises an optical fingerprint recognition device 1026. The optical fingerprint recognition device 1026 comprises a plurality of optical fingerprint recognition systems 40 of the fourth embodiment described above, wherein Figure 11 only two optical fingerprint recognition systems 40 are shown for illustrative purposes, and Figure 11The optical fingerprint recognition system 40 and finger FG are not drawn to scale. As described in the fourth embodiment, the optical fingerprint recognition system 40 not only has the fingerprint recognition function, but also includes a screen unit 451 that can display images, a touch layer 46 that can also provide touchscreen functionality, and a protective layer 48 that can also provide protection. The optical fingerprint recognition device 1026 can also be configured with the optical fingerprint recognition system of other embodiments, and the present invention is not limited thereto.

[0175] Please refer to Figure 12 and Figure 13 ,in Figure 12 Draw Figure 10 The configuration relationship of the optical fingerprint recognition device is shown in the schematic diagram above, and Figure 13 Draw Figure 10 Schematic diagram of the optical fingerprint recognition device.

[0176] The optical fingerprint recognition device 1026 includes a plurality of light path redirecting elements 47, a plurality of light emitting elements 452, a plurality of collimating units 43 and a plurality of light sensing elements 42. Figure 13 It can be seen that the light path redirecting element 47 is located above the light emitting element 452 in the stacking direction Z. Figure 12 and Figure 13 As can be seen, the light path deflection elements 47 are arranged at equal intervals in the first direction X and the second direction Y. Each light path deflection element 47 is located between two adjacent light-emitting elements 452 in the first direction X and the second direction Y. The light path deflection elements 47 and the light-emitting elements 452 are offset from each other in the first direction X and the second direction Y, where the second direction Y is substantially perpendicular to the first direction X and the stacking direction Z. The light-emitting elements 452 are arranged at equal intervals in the first direction X and the second direction Y. A plurality of collimating units 43 are distributed throughout the layered structure, thereby forming a collimating layer (not separately labeled). The photosensitive elements 42 are located below the light-emitting elements 452 in the stacking direction Z and are arranged at equal intervals in the first direction X. Specifically, each photosensitive element 42 is located between two adjacent light-emitting elements 452 in the first direction X, and the photosensitive element 42 is aligned with the light path deflection element 47 and the collimation unit 43 in the stacking direction Z so as to receive imaging light from the light path deflection element 47 and the collimation unit 43 to form an image on the photosensitive element 42.

[0177] In this embodiment, the light path redirecting element 47 and the light emitting element 452 are as follows: Figure 12 The configuration in the embodiment is not intended to limit the present invention.

[0178] The optical fingerprint recognition systems 10-90 and the optical fingerprint recognition device 1026 of the present application can be applied to under-screen fingerprint recognition, and have the characteristics of excellent aberration correction and good imaging quality, but are not limited to application to smart phones. For example, the optical fingerprint recognition systems 10-90 and the optical fingerprint recognition device 1026 can also be widely applied to electronic devices such as tablet computers, portable video recorders, and multi-lens devices.

[0179] Although the present application has been disclosed in the above embodiments, it is not intended to limit the present application, and any person skilled in the art can make various modifications and improvements without departing from the spirit and scope of the present application, and the scope of protection of the present application shall be subject to the scope defined by the claims.

Claims

1. An optical fingerprint recognition system, characterized in that, The optical fingerprint recognition system comprises: a base; a light sensing element disposed above the base; a light emitting layer disposed above the light sensing element, wherein the light emitting layer comprises a light emitting element; and a protective layer disposed above the light emitting layer; wherein the optical fingerprint recognition system further comprises a light path turning element between the light sensing element and the protective layer; wherein the light emitting element is disposed in a side direction of the light path turning element and the light sensing element, and the side direction is different from a stacking direction of the optical fingerprint recognition system; wherein the optical fingerprint recognition system further comprises a light collecting element having a light collecting function, and the light sensing element, the light collecting element, the light emitting layer and the light path turning element are sequentially disposed in the stacking direction.

2. The optical fingerprint recognition system according to claim 1, characterized in that, The light path turning element comprises a wedge-shaped prism.

3. The optical fingerprint recognition system according to claim 2, wherein, Further comprising a condenser lens, wherein the condenser lens is the light collecting element, and the condenser lens is disposed above the light sensing element and below the light path turning element.

4. The optical fingerprint recognition system according to claim 3, wherein, Further comprising a light collecting medium layer, wherein the light collecting medium layer is disposed below the condenser lens, and the light collecting medium layer has a refractive index nA satisfying the following condition: 1.60 < nA < 5.

0.

5. The optical fingerprint recognition system according to claim 1, wherein, Further comprising a light interference filter layer and a light absorption filter layer, wherein the light interference filter layer and the light absorption filter layer are disposed above the light sensing element and below the light path turning element, the light interference filter layer is used to produce a filter band translation according to the change of incident light angle, and the light absorption filter layer is a light passing filter layer.

6. The optical fingerprint recognition system according to claim 5, wherein, The light passing band of the light absorption filter layer is visible light to near-infrared light, and the full width at half maximum of the band of the light passing through the light interference filter layer and the light absorption filter layer is FWHM, which satisfies the following condition: FWHM < 100 nanometers.

7. The optical fingerprint recognition system according to claim 1, wherein, The light path turning element comprises a gradient refractive index element.

8. The optical fingerprint recognition system according to claim 7, wherein, The maximum refractive index of the gradient refractive index element is Nmax, and the minimum refractive index of the gradient refractive index element is Nmin, which satisfies the following condition: 1.2 < Nmax / Nmin < 4.

5.

9. The optical fingerprint recognition system according to claim 7, wherein, The refractive index of the gradient refractive index element decreases along the direction away from the light emitting element.

10. The optical fingerprint recognition system according to claim 1, wherein, The light path turning element comprises at least two medium layers, a turning inclined surface is formed between two adjacent medium layers of the at least two medium layers, and the two adjacent medium layers of the at least two medium layers are connected to each other through the turning inclined surface.

11. The optical fingerprint recognition system according to claim 10, wherein, The refractive index of the at least two medium layers decreases along the direction away from the light emitting element.

12. The optical fingerprint recognition system according to claim 10, wherein, The turning inclined surface is a total reflection surface.

13. The optical fingerprint recognition system according to claim 1, wherein, The light emitting element is disposed on the same side of the light path turning element and the light sensing element.

14. The optical fingerprint recognition system according to claim 1, wherein, Further comprising a chip-level lens group, wherein the chip-level lens group is the light collecting element, and the chip-level lens group is disposed above the light sensing element and below the light path turning element.

15. The optical fingerprint recognition system according to claim 1, wherein, Further comprising a meta-lens, wherein the meta-lens is the light collecting element, and the meta-lens is disposed above the light sensing element and below the light path turning element.

16. The optical fingerprint recognition system according to claim 1, wherein, The optical absorption layer surrounds an outer circumferential surface of the light path turning element.

17. The optical fingerprint recognition system according to claim 1, wherein, The light path turning element and the light sensing element are aligned with each other in a stacking direction of the optical fingerprint recognition system.

18. The optical fingerprint recognition system according to claim 1, wherein, The light emitting layer further comprises a screen unit, the screen unit comprises the light emitting element, and the light emitting element is an organic light emitting diode.

19. The optical fingerprint recognition system according to claim 1, wherein, The light emitting element and the light sensing element are connected by a thin film transistor structure.

20. The optical fingerprint recognition system according to claim 1, wherein, The light path turning element comprises a Fresnel lens.

21. An optical fingerprint recognition device, characterized in that, Comprise: a plurality of light emitting elements, wherein the plurality of light emitting elements are arranged at equal intervals in a first direction and a second direction, and the first direction is substantially perpendicular to the second direction; a plurality of light path turning elements, wherein the plurality of light path turning elements are located above the plurality of light emitting elements in a stacking direction of the optical fingerprint recognition device, the stacking direction is substantially perpendicular to the first direction and the second direction, the plurality of light path turning elements are arranged at equal intervals in the first direction, and each of the plurality of light path turning elements is located between two adjacent light emitting elements in the first direction; and a plurality of light sensing elements, wherein the plurality of light sensing elements are located below the plurality of light emitting elements in the stacking direction, the plurality of light sensing elements are arranged at equal intervals in the first direction, and each of the plurality of light sensing elements is located between two adjacent light emitting elements in the first direction; The optical fingerprint recognition device further comprises a plurality of light collecting elements, the plurality of light collecting elements have light collecting function, and the plurality of light sensing elements, the plurality of light collecting elements, the plurality of light emitting elements and the plurality of light path turning elements are sequentially arranged in the stacking direction.

22. The optical fingerprint recognition device according to claim 21, wherein, The plurality of light path turning elements and the plurality of light sensing elements are aligned with each other in the stacking direction.

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