Optical fingerprint recognition system and optical fingerprint recognition device

Abstract

The present application discloses an optical fingerprint recognition system and an optical fingerprint recognition device. The optical fingerprint recognition system 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-collecting unit and a light-receiving element between the photosensitive element and the protective layer. The light-collecting unit is arranged above the photosensitive element. The light-receiving element is arranged above the light-collecting unit. The light-emitting element is arranged in a side direction of the photosensitive element, the light-collecting unit and the light-receiving element, and the side direction is different from the stacking direction of the optical fingerprint recognition system. The optical fingerprint recognition device has the above-mentioned optical fingerprint recognition system.

Description

Technical Field

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

[0002] In recent years, with the widespread use of smart mobile devices, a large amount of personal information is stored in smart mobile devices, which has significantly increased the demand for information security in smart mobile devices. Currently, there are many types of security systems available on the market, such as graphic password authentication systems, fingerprint recognition systems, and facial recognition systems, among which fingerprint recognition systems have the highest popularity. In the past, capacitive devices were the majority of fingerprint recognition systems, but now, in response to the demand for higher screen-to-body ratios in smart mobile devices, under-screen fingerprint recognition systems have developed rapidly. Under-screen fingerprint recognition systems are mostly divided into two types: optical and ultrasonic. Optical fingerprint recognition systems have rapidly become popular due to their advantages such as high recognition accuracy and easy integration into smart devices.

[0003] Previous optical under-screen fingerprint recognition systems were mostly located beneath the screen, using the screen as a light source. Light is projected onto the user's fingerprint, which is then reflected by a photosensitive element beneath the screen to record the user's fingerprint and perform fingerprint recognition. However, this configuration captures residual images from many light-emitting elements within the screen module when capturing the fingerprint image. This can easily produce a Moire effect, resulting in poor fingerprint image quality and increased difficulty in fingerprint recognition. Summary of the Invention

[0004] In view of the above-mentioned problems, the present invention provides an optical fingerprint recognition system and an optical fingerprint recognition device, which help to improve the problem of capturing the residual image of the light-emitting element in the screen module when capturing the fingerprint image, thereby obtaining an optical fingerprint recognition system and an optical fingerprint recognition device with high recognition accuracy and high fingerprint image quality.

[0005] The present invention provides an optical fingerprint recognition system, comprising 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 comprises a light-focusing unit and a light-receiving element between the photosensitive element and the protective layer. The light-focusing unit is disposed above the photosensitive element. The light-receiving element is disposed above the light-focusing unit. The light-emitting element is disposed in a side direction of the photosensitive element, the light-focusing unit, and the light-receiving element, and the side direction is different from a stacking direction of the optical fingerprint recognition system.

[0006] The present invention further provides an optical fingerprint recognition system comprising a base, a photosensitive element, a light-gathering layer, a light-emitting layer, a light-receiving element, and a protective layer. The photosensitive element is disposed above the base. The light-gathering layer is disposed above the photosensitive element. The light-emitting layer is disposed above the light-gathering layer and includes a light-emitting element. The light-receiving element is disposed above the light-emitting layer. The protective layer is disposed above the light-receiving element. The light-emitting element is disposed along a side of the photosensitive element and the light-receiving element, and the side direction is different from a stacking direction of the optical fingerprint recognition system.

[0007] The present invention provides an optical fingerprint recognition device, comprising a plurality of light-emitting elements, a plurality of light-receiving elements, and a plurality of photosensitive 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-receiving elements are located above the light-emitting elements in a stacking direction of the optical fingerprint recognition device, the light-receiving elements are arranged at equal intervals in the first direction, and each light-receiving element 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 photosensitive elements are located below the light-emitting elements in the stacking direction, the light-receiving elements are arranged at equal intervals in the first direction, and each photosensitive element is located between two adjacent light-emitting elements in the first direction.

[0008] The optical fingerprint recognition system and optical fingerprint recognition device disclosed in the present invention are advantageous in avoiding residual images of light-emitting elements in the screen module when capturing fingerprint images, effectively improving the quality of fingerprint images, thereby reducing the difficulty and time of fingerprint recognition and improving recognition accuracy.

[0009] The above description of the disclosed contents and the following description of the embodiments are intended to demonstrate and explain the spirit and principles of the present invention, and to provide further explanation of the scope of the patent application of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 FIG. 1 is a schematic diagram illustrating an optical fingerprint recognition system according to a first embodiment of the present invention.

[0011] Figure 2 FIG. 1 is a schematic diagram illustrating an optical fingerprint recognition system according to a second embodiment of the present invention.

[0012] Figure 3 FIG. 1 is a schematic diagram illustrating an optical fingerprint recognition system according to a third embodiment of the present invention.

[0013] Figure 4 FIG. 4 is a schematic diagram illustrating an optical fingerprint recognition system according to a fourth embodiment of the present invention.

[0014] Figure 5 FIG. 4 is a schematic diagram illustrating an optical fingerprint recognition system according to a fifth embodiment of the present invention.

[0015] Figure 6 FIG. 1 is a schematic diagram illustrating an optical fingerprint recognition system according to a sixth embodiment of the present invention.

[0016] Figure 7 FIG. 1 is a schematic diagram illustrating an optical fingerprint recognition system according to a seventh embodiment of the present invention.

[0017] Figure 8 FIG. 4 is a schematic diagram illustrating an application of an optical fingerprint recognition device according to an eighth embodiment of the present invention.

[0018] Figure 9 Draw Figure 8 Schematic diagram of an optical fingerprint recognition device identifying a fingerprint.

[0019] Figure 10 Draw Figure 8 Schematic diagram of the configuration of the optical fingerprint recognition device.

[0020] Figure 11 Draw Figure 10 A three-dimensional schematic diagram of the light-receiving element of the optical fingerprint recognition device.

[0021] Figure 12 Draw Figure 10 Schematic diagram of the optical fingerprint recognition device.

[0022] Figure 13 FIG. 1 is a top view schematically showing the configuration of an optical fingerprint recognition device according to a ninth embodiment of the present invention.

[0023] Figure 14 FIG. 1 is a top view schematically showing the configuration of an optical fingerprint recognition device according to a tenth embodiment of the present invention.

[0024] Figure 15 FIG. 1 is a top view schematically illustrating the configuration of an optical fingerprint recognition device according to an eleventh embodiment of the present invention.

[0025] Figure 16 A graph illustrating the wavelength band and transmittance of light passing through the light interference filter layer and the light absorption filter layer when the light is irradiated at an incident angle of 0 degrees according to an embodiment of the present invention is shown.

[0026] Figure 17 A graph illustrating the wavelength band and transmittance of light passing through the light interference filter layer and the light absorption filter layer when the light is irradiated at an incident angle of 45 degrees according to an embodiment of the present invention is shown.

[0027] The symbols are explained as follows:

[0028] 1…Electronic devices

[0029] 101…Imaging device

[0030] 102…Display device

[0031] 1021…Screen display layer

[0032] 1022…Screen touch layer

[0033] 1023...Transparent tablet

[0034] 1026, 2026, 3026, 4026... Optical fingerprint recognition device

[0035] 10, 20, 30, 40, 50, 60, 70... Optical fingerprint recognition system

[0036] 11, 21, 31, 41, 51, 61, 71…base

[0037] 13, 23, 33, 43, 53, 63, 73...photosensitive elements

[0038] 14, 34, 44, 54, 64, 74... focusing units

[0039] 141, 541, 641, 741… dielectric layer

[0040] 142, 542, 642, 742…reflective layer

[0041] 24…Light Concentration Layer

[0042] 241…medium

[0043] 341, 441…condenser lens

[0044] 341a, 441a…convex

[0045] 643…Upper dielectric layer

[0046] 644…Upper reflector

[0047] 15, 25, 35, 45, 55, 65, 75...luminescent layer

[0048] 151, 251, 351, 451, 551, 651, 751… screen units

[0049] 152, 252, 352, 452, 552, 652, 752, 2028, 3028, 4028... light-emitting elements

[0050] 16, 26, 36, 66… touch layer

[0051] 17, 27, 37, 47, 57, 67, 77, 2027, 3027, 4027... light receiving elements

[0052] 171, 271, 571, 671, 771…light-collecting lenses

[0053] 171a, 271a, 571a, 671a, 771a… convex

[0054] 371…Optical interference filter

[0055] 372…Light absorbing filter layer

[0056] 471…Light-collecting lens

[0057] 472…Light interference filter medium layer

[0058] 18, 28, 38, 48, 58, 68, 78... protective layer

[0059] 79…Light guide layer

[0060] 791…Another light-emitting element

[0061] FG…Finger

[0062] RG…Spine

[0063] VL…Tanibe

[0064] CL…Converging Rays

[0065] SL…Sensing light

[0066] TFT1, TFT2, TFT3, TFT4, TFT5, TFT6, TFT7, TFT8, TFT9...Thin-film transistor structure

[0067] X…first direction

[0068] Y…second direction

[0069] Z…Layer direction. DETAILED DESCRIPTION

[0070] The following detailed description of the features and advantages of the present invention is sufficient to enable anyone skilled in the art to understand the technical content of the present invention and implement it accordingly. Furthermore, based on the disclosure of this specification, the scope of the claims, and the accompanying drawings, anyone skilled in the art can easily understand the relevant objectives and advantages of the present invention. The following examples further illustrate the concepts of the present invention but are not intended to limit the scope of the present invention in any way.

[0071] The present invention provides an optical fingerprint recognition system, comprising 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 includes a light-emitting element. The protective layer is arranged above the light-emitting layer. The optical fingerprint recognition system further comprises a light-focusing unit and a light-receiving element between the photosensitive element and the protective layer. The light-focusing unit is arranged above the photosensitive element. The light-receiving element is arranged above the light-focusing unit. The light-emitting element is arranged in a side direction of the photosensitive element, the light-focusing unit and the light-receiving element, and the side direction is different from a stacking direction of the optical fingerprint recognition system. The above configuration is conducive to avoiding the afterimage of the light-emitting element in the screen module when capturing the fingerprint image, which can effectively improve the quality of the fingerprint image, thereby reducing the difficulty and time of fingerprint recognition, and improving the accuracy of recognition.

[0072] The light receiving element may include a light interference filter layer (Light Interference Filter Layer) and a light absorption filter layer (Light Absorption Filter Layer). The light interference filter layer and the light absorption filter layer may be formed by a combination of two edgepass filter layers, or a general bandpass filter layer may be used. The light interference filter layer and the light absorption filter layer may be configured by using a filter medium layer or coating on other light-transmitting elements. The light interference filter layer may produce a filter band shift (Bandwidth Shift) according to the change in the angle of the incident light, and the light absorption filter layer may be a light pass filter layer. By combining the light interference filter layer with the light absorption filter layer, light with an incident angle that is too large can be filtered out, thereby eliminating image noise. Among them, the light pass band of the light absorption filter layer may be from visible light to near-infrared light (NIR). Please refer to Figure 16 and Figure 17 , Figure 16 A line graph is shown showing the wavelength band and transmission rate of light passing through the light interference filter layer and the light absorption filter layer when the light interference filter layer is irradiated with light at a normal incident angle (0 degree incident angle) according to one embodiment of the present invention. Figure 17 A line graph is shown showing the wavelength and transmission rate of light passing through the light interference filter layer and the light absorption filter layer when the light interference filter layer is irradiated with light at an incident angle of 45 degrees according to an embodiment of the present invention. The horizontal axis of the graph is the wavelength of light (in nanometers) and the vertical axis is the transmission rate of light (in percentage). Figure 16 and Figure 17 In the embodiment of the invention, the light interference filter layer and the light absorption filter layer are side-pass filter layers that match each other, wherein the light interference filter layer is a short-pass filter layer, and the light absorption filter layer is a long-pass filter layer. Figure 16 and Figure 17 It can be seen that the wavelengths that can pass through the light interference filter layer and the light absorption filter layer will be different when the incident angle of the light is different. For details, please refer to Figure 16 When light is incident vertically, light with wavelengths below approximately 850 nanometers (the upper limit of the short pass) can pass through the light interference filter layer, and when light is incident vertically, light with wavelengths above approximately 800 nanometers (the lower limit of the long pass) can pass through the light absorption filter layer. In other words, when light is incident vertically, light with wavelengths between approximately 800 nanometers and approximately 850 nanometers (near-infrared light) can pass through both the light interference filter layer and the light absorption filter layer. Next, please refer to Figure 17 When the light is incident at a 45-degree angle, only light with a wavelength below 760 nanometers can pass through the optical interference filter due to the large incident angle. Figure 16 In the case of vertical incident light, the wavelength of light that can pass through the light interference filter layer shifts to the left, which is the phenomenon of the above-mentioned filter band shift. When the light is incident at a 45-degree angle, the wavelength of light that can pass through the light absorption filter layer is smaller than that of the light absorption filter layer. Figure 16 The status in remains unchanged. Figure 17 In this state, the wavelengths of light that can pass through the interference filter layer and the absorption filter layer no longer overlap. Therefore, light incident at a 45-degree angle cannot pass through either the interference filter layer or the absorption filter layer. This achieves the aforementioned effect of filtering out light incident at excessively large angles.

[0073] The light-collecting element may also include a light-collecting lens and a light interference filter layer. The light-collecting lens may comprise a light-absorbing material, which is a light-transmitting filter. The light interference filter layer is located on the mirror surface of the light-collecting lens and is configured to shift the filter wavelength in response to changes in the angle of incident light. This allows light with excessively large incident angles to be filtered out, thereby eliminating image noise.

[0074] The light-concentrating unit may include a dielectric layer and a reflective layer, with the reflective layer surrounding the dielectric layer. This allows the use of an appropriate light-conducting medium to shorten the required length and thickness of the optical fingerprint recognition system, facilitating its deployment in thin electronic devices. Furthermore, the reflective layer prevents light from escaping from the dielectric layer, thereby enhancing light transmission within the dielectric layer.

[0075] The light focusing unit may further include an upper dielectric layer and an upper reflective layer, wherein the upper reflective layer surrounds the outer side of the upper dielectric layer, and the upper dielectric layer and the upper reflective layer are located above the dielectric layer and the reflective layer, thereby enhancing the light focusing effect and further shortening the total length.

[0076] The optical fingerprint recognition system disclosed in the present invention may further include a light-guiding layer disposed above the light-emitting layer. Thus, the light-guiding layer can be used as a second light source to reduce overall power consumption.

[0077] The light emitting element can be configured to emit red or green light, thereby providing photoplethysmogram information to confirm that the identified object is a living organism.

[0078] The light-receiving element and the light-sensing element are aligned with each other in the stacking direction of the optical fingerprint recognition system; that is, the orthographic projection of the light-receiving element on the base overlaps the orthographic projection of the light-sensing element on the base. This allows the light received by the light-receiving element to be fully transmitted to the light-sensing element, thereby increasing the light sensitivity of the light-sensing element.

[0079] The light emitting element can be arranged on the same side of the light sensing element, the light focusing unit and the light receiving element. Thus, the light sensing element, the light focusing unit and the light receiving element can be combined into an image recognition unit, which is conducive to modularization.

[0080] The light-emitting layer may 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). This facilitates the configuration of an under-screen fingerprint recognition system.

[0081] The photosensitive element and the light-emitting element can be interconnected via a thin-film transistor (TFT) structure. This connection allows for synchronization of their on / off states, controlling the emission and capture of light. This eliminates unnecessary stray light signals and crosstalk, improving recognition accuracy. Multiple photosensitive elements can form an imaging element, such as a complementary metal-oxide-semiconductor (CMOS) device. This allows light passing through multiple light-focusing units to form images on multiple photosensitive elements.

[0082] The optical fingerprint recognition system disclosed in this invention may further include a touch layer, located between the light-collecting element and the light-focusing unit. The touch layer may be disposed above, below, or integrated into the light-emitting layer. This provides both touch functionality and the ability to confirm whether the object being recognized is alive.

[0083] The full width at half maximum (FWHM) of the optical transmission band of the optical interference filter layer or the optical absorption filter layer is FWHM, which can satisfy the following condition: FWHM < 100 [nanometers]. Thereby, the bandwidth of the optical transmission band can be restricted to control the angle of the incident angle. Among them, the following condition can also be satisfied: FWHM < 50 [nanometers].

[0084] The refractive index of the dielectric layer is nA, which can satisfy the following condition: 1.60 < nA < 5.0. Thereby, the light can be further condensed to shorten the total optical path length, so as to reduce the thickness of the optical fingerprint recognition system. Among them, the following condition can also be satisfied: 1.80 < nA < 3.0. Among them, the appropriate dielectric layer material can be selected according to the requirements of the condensing intensity and the manufacturing difficulty, and the following condition can also be satisfied: nA = 1.61. Among them, the following condition can also be satisfied: nA = 1.77. Among them, the following condition can also be satisfied: nA = 1.85. Among them, the following condition can also be satisfied: nA = 2.42.

[0085] The refractive index of the dielectric layer is nA, and the refractive index of the reflective layer is nR, which can satisfy the following condition: nR < nA. Thereby, it is beneficial to generate total reflection inside the dielectric layer to improve the optical conduction efficiency. Among them, the following conditions can also be satisfied: nA = 1.85; and nR = 1.56.

[0086] The refractive index of the dielectric layer is nA, and the refractive index of the upper dielectric layer is nB, which can satisfy the following condition: nB < nA. Thereby, the condensing effect can be improved, and total reflection between the dielectric layer and the upper dielectric layer can be avoided. Among them, the following conditions can also be satisfied: nA = 1.85; and nB = 1.77.

[0087] The condensing unit can include a condensing lens. Among them, the refractive index of the condensing lens is nL1, which can satisfy the following condition: 1.60 < nL1 < 2.50; thereby, it is beneficial to provide sufficient refractive power to shorten the total length of the optical fingerprint recognition system. Among them, the following conditions can also be satisfied: nL1 = 1.61. Among them, the following conditions can also be satisfied: nL1 = 1.75. Among them, the following conditions can also be satisfied: nL1 = 2.42.

[0088] The refractive index of the converging lens is nL1, the refractive index of the light-collecting lens is nL2, the refractive index of one of the converging lens and the light-collecting lens is nLi, the glass transition temperature of the material of the converging lens is Tg1, the glass transition temperature of the material of the light-collecting lens is Tg2, and the glass transition temperature of the material of one of the converging lens and the light-collecting lens is Tgi. At least one of the converging lens and the light-collecting lens may satisfy the following condition: 0 < 100 × nLi / (650 - Tgi) < 8, where i = 1 or 2. This provides a sufficient converging effect and reduces the difficulty of lens molding. Furthermore, at least one of the converging lens and the light-collecting lens may satisfy the following condition: 0.5 < 100 × nLi / (650 - Tgi) < 6, where i = 1 or 2. At least one of the condensing lens and the light-collecting lens may satisfy the following conditions: 0.65 < 100 × nLi / (650 - Tgi) < 5.2, where i = 1 or 2. At least one of the condensing lens and the light-collecting lens may satisfy the following conditions: 100 × nLi / (650 - Tgi) = 0.68, where i = 1 or 2. At least one of the condensing lens and the light-collecting lens may satisfy the following conditions: 100 × nLi / (650 - Tgi) = 0.85, where i = 1 or 2. At least one of the condensing lens and the light-collecting lens may satisfy the following conditions: 100 × nLi / (650 - Tgi) = 4.13, where i = 1 or 2. At least one of the condensing lens and the light-collecting lens may satisfy the following conditions: 100 × nLi / (650 - Tgi) = 5.15, where i = 1 or 2. The Celsius temperatures Tg1, Tg2, and Tgi used in the relational conditional expressions of this specification refer only to the Celsius temperature values ​​of the material at the time of glass transition, and therefore are dimensionless quantities without units.

[0089] The present invention provides another optical fingerprint recognition system, comprising a base, a photosensitive element, a light-gathering layer, a light-emitting layer, a light-receiving element, and a protective layer. The photosensitive element is disposed above the base. The light-gathering layer is disposed above the photosensitive element. The light-emitting layer is disposed above the light-gathering layer, and the light-emitting layer includes a light-emitting element. The light-receiving element is disposed above the light-emitting layer. The protective layer is disposed above the light-receiving element. The light-emitting element is disposed in a side direction between the photosensitive element and the light-receiving element, and the side direction is different from a stacking direction of the optical fingerprint recognition system. Through the above configuration, replacing the light-gathering unit with a light-gathering layer can reduce the difficulty of the overall process.

[0090] The present invention provides an optical fingerprint recognition device, comprising a plurality of light-emitting elements, a plurality of light-receiving elements, and a plurality of photosensitive elements. The light-emitting elements are respectively 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-receiving elements are located above the light-emitting elements in a stacking direction of the optical fingerprint recognition device, the light-receiving elements are arranged at equal intervals in the first direction, and each light-receiving element 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 photosensitive elements are located below the light-emitting elements in the stacking direction, the photosensitive elements are arranged at equal intervals in the first direction, and each photosensitive element is located between two adjacent light-emitting elements in the first direction. Through the above wafer-level optical configuration (Wafer Level Optic), the volume of the overall optical fingerprint recognition device can be reduced, and it is convenient to integrate into the current screen process.

[0091] The various technical features of the optical fingerprint recognition system and the optical fingerprint recognition device of the present invention can be configured in combination to achieve corresponding effects.

[0092] Based on the above implementation manner, specific embodiments are presented below and described in detail with reference to the accompanying drawings.

[0093] <First embodiment>

[0094] Please refer to Figure 1 , depicts a schematic diagram of an optical fingerprint recognition system according to a first embodiment of the present invention. In this embodiment, the optical fingerprint recognition system 10 includes a base 11, a photosensitive element 13, a light-concentrating unit 14, a light-emitting layer 15, a touch layer 16, a light-receiving element 17, and a protective layer 18. The photosensitive element 13 is disposed above the base 11 in the stacking direction Z. The light-concentrating unit 14 is disposed above the photosensitive element 13 in the stacking direction Z. The light-emitting layer 15 is disposed above the photosensitive element 13 and the light-concentrating unit 14 in the stacking direction Z. The touch layer 16 is disposed above the light-emitting layer 15 in the stacking direction Z. The light-receiving element 17 is disposed above the light-concentrating unit 14, 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 light-receiving element 17 and the light-concentrating unit 14. The protective layer 18 is disposed above the light-emitting layer 15 and the light-receiving element 17 in the stacking direction Z.

[0095] Specifically, the focusing unit 14 is located between the photosensitive element 13 and the protective layer 18. The focusing unit 14 includes a dielectric layer 141 and a reflective layer 142. The reflective layer 142 surrounds the dielectric layer 141 with a line segment parallel to the stacking direction Z and passing through the geometric center of the dielectric layer 141 as an axis.

[0096] The light-receiving element 17 is located between the light-receiving element 13 and the protective layer 18. The light-receiving element 17 and the light-receiving element 13 are aligned with each other in the stacking direction Z. That is, the orthographic projection of the light-receiving element 17 on the base 11 overlaps the orthographic projection of the light-receiving element 13 on the base 11. The light-receiving element 17 includes a light-receiving lens 171. The light-receiving lens 171 has a convex surface 171a facing the protective layer 18 in the stacking direction Z.

[0097] The light-emitting layer 15 includes a screen unit 151, which in turn includes light-emitting elements 152. The light-emitting elements 152 are disposed lateral to the light-sensing element 13, the light-concentrating element 14, and the light-receiving element 17, with the lateral direction being different from the stacking direction Z. Specifically, the light-emitting elements 152 are disposed on the same side of the light-sensing element 13, the light-concentrating element 14, and the light-receiving element 17 in a first direction X, where the first direction X coincides with the lateral direction. Furthermore, the light-emitting elements 152 are, for example, organic light-emitting diodes (OLEDs), which can function as light sources emitting red or green light.

[0098] The light emitting element 152 and the base 11 are connected to each other through the thin film transistor structure TFT1 , and the light emitting element 152 is indirectly connected to the photosensitive element 13 through the thin film transistor structure TFT1 and the base 11 .

[0099] The refractive index of the dielectric layer 141 is nA, and the refractive index of the reflective layer 142 is nR, which satisfy the following conditions: nA=1.61, 1.77, 1.85, or 2.42; and nR=1.56.

[0100] The refractive index of the light-collecting lens 171 is nL2, and the glass transition temperature of the material of the light-collecting lens 171 is Tg2, which satisfies the following conditions: 100×nL2 / (650−Tg2)=0.68, 0.85, 4.13, or 5.15.

[0101] When a user's finger FG is placed on the protective layer 18, the light-emitting element 152 emits sensing light SL toward the finger FG. Because the finger FG has fingerprint ridges, the surface of the finger FG has valleys VL and ridges RG. The sensing light SL is reflected by the valleys VL and ridges RG (for ease of illustration, only the sensing light SL reflected by the ridges RG is shown in the drawings in this embodiment and all subsequent embodiments) onto the convex surface 171a of the light-collecting lens 171. It is then directed to the focusing unit 14 and becomes a converging light CL directed toward the photosensitive element 13. The converging light CL forms an image on the photosensitive element 13, which transmits information to a processor (not shown) that aggregates the images generated by the optical fingerprint recognition system into integer units for interpretation.

[0102] <Second embodiment>

[0103] Please refer to Figure 2, depicts a schematic diagram of an optical fingerprint recognition system according to a second embodiment of the present invention. In this embodiment, the optical fingerprint recognition system 20 includes a base 21, a photosensitive element 23, a light-collecting layer 24, a light-emitting layer 25, a touch layer 26, a light-receiving element 27, and a protective layer 28. The photosensitive element 23 is disposed above the base 21 in the stacking direction Z. The light-collecting layer 24 is disposed above the photosensitive element 23 in the stacking direction Z. The light-receiving layer 25 is disposed above the photosensitive element 23 and the light-collecting layer 24 in the stacking direction Z. The touch layer 26 is integrated into the structure of the light-emitting layer 25 and is located on the same layer as the light-emitting layer 25. The light-receiving element 27 is disposed above the light-collecting layer 24, the light-receiving layer 25, and the touch layer 26 in the stacking direction Z, such that the touch layer 26 is located between the light-receiving element 27 and the light-collecting layer 24. The protective layer 28 is disposed above the light-receiving layer 25 and the light-receiving element 27 in the stacking direction Z.

[0104] Specifically, the light-collecting layer 24 is located between the photosensitive element 23 and the protective layer 28. The light-collecting layer 24 includes a medium 241. Since the medium 241 actually covers the entire light-collecting layer 24, the light-collecting layer 24 can also be referred to as a light-collecting medium layer.

[0105] The light-receiving element 27 is located between the light-receiving element 23 and the protective layer 28. The light-receiving element 27 and the light-receiving element 23 are aligned with each other in the stacking direction Z. That is, the orthographic projection of the light-receiving element 27 on the base 21 overlaps the orthographic projection of the light-receiving element 23 on the base 21. The light-receiving element 27 includes a light-receiving lens 271. The light-receiving lens 271 has a convex surface 271a facing the protective layer 28 in the stacking direction Z.

[0106] The light-emitting layer 25 includes a screen unit 251, which includes light-emitting elements 252. The light-emitting elements 252 are disposed lateral to the light-sensing element 23 and the light-receiving element 27, with the lateral direction being different from the stacking direction Z. Specifically, the light-emitting elements 252 are disposed on the same side of the light-sensing element 23 and the light-receiving element 27 in a first direction X, where the first direction X coincides with the lateral direction. Furthermore, the light-emitting elements 252 are, for example, organic light-emitting diodes (OLEDs), which can function as light sources emitting red or green light.

[0107] The light emitting element 252 and the base 21 are connected to each other through the thin film transistor structure TFT2 , and the light emitting element 252 is indirectly connected to the photosensitive element 23 through the thin film transistor structure TFT2 and the base 21 .

[0108] The refractive index of the medium 241 is nA, which satisfies the following conditions: nA=1.61, 1.77, 1.85, or 2.42.

[0109] The refractive index of the light-collecting lens 271 is nL2, and the glass transition temperature of the material of the light-collecting lens 271 is Tg2, which satisfies the following conditions: 100×nL2 / (650−Tg2)=0.68, 0.85, 4.13, or 5.15.

[0110] When a user's finger FG is placed on the protective layer 28, the light-emitting element 252 emits sensing light SL toward the finger FG. Due to the fingerprint pattern on the finger FG, the surface of the finger FG has valleys VL and ridges RG. The sensing light SL is reflected by the valleys VL and ridges RG onto the convex surface 271a of the light-collecting lens 271. It is then transmitted to the light-collecting layer 24 and becomes a converging light CL directed toward the photosensitive element 23. The converging light CL forms an image on the photosensitive element 23, which transmits information to a processor (not shown) that aggregates the images generated by the optical fingerprint recognition system into integer units for interpretation.

[0111] <Third embodiment>

[0112] Please refer to Figure 3 , depicts a schematic diagram of an optical fingerprint recognition system according to a third embodiment of the present invention. In this embodiment, the optical fingerprint recognition system 30 includes a base 31, a photosensitive element 33, a light-concentrating unit 34, a light-emitting layer 35, a touch layer 36, a light-receiving element 37, and a protective layer 38. The photosensitive element 33 is disposed above the base 31 in the stacking direction Z. The light-concentrating unit 34 is disposed above the photosensitive element 33 in the stacking direction Z. The light-receiving layer 35 is disposed above the photosensitive element 33 and the light-concentrating unit 34 in the stacking direction Z. The touch layer 36 is disposed below the light-receiving layer 35 in the stacking direction Z. The light-receiving element 37 is disposed above the light-concentrating unit 34, the touch layer 36, and the light-receiving layer 35 in the stacking direction Z, such that the touch layer 36 is located between the light-receiving element 37 and the light-concentrating unit 34. The protective layer 38 is disposed above the light-receiving layer 35 and the light-receiving element 37 in the stacking direction Z.

[0113] Specifically, the light focusing unit 34 is located between the photosensitive element 33 and the protective layer 38. The light focusing unit 34 includes a light focusing lens 341. The light focusing lens 341 has a convex surface 341a facing the base 31 in the stacking direction Z.

[0114] The light-receiving element 37 is positioned between the photosensitive element 33 and the protective layer 38. The light-receiving element 37 and the photosensitive element 33 are aligned with each other in the stacking direction Z; that is, the orthographic projection of the light-receiving element 37 on the base 31 overlaps the orthographic projection of the photosensitive element 33 on the base 31. The light-receiving element 37 includes a light interference filter layer 371 and a light absorption filter layer 372. The light absorption filter layer 372 is disposed between the light interference filter layer 371 and the focusing unit 34. A fixing structure (not separately labeled) is provided on the outer peripheral surfaces of the light interference filter layer 371 and the light absorption filter layer 372 to secure the light interference filter layer 371 and the light absorption filter layer 372. The light absorption filter layer 372 is a light-transmitting filter layer, and the light transmission band of the light absorption filter layer 372 is from visible light to near-infrared light.

[0115] The light-emitting layer 35 includes a screen unit 351, which in turn includes light-emitting elements 352. The light-emitting elements 352 are disposed lateral to the light-sensing element 33, the light-concentrating element 34, and the light-receiving element 37, with the lateral direction being different from the stacking direction Z. Specifically, the light-emitting elements 352 are disposed on the same side of the light-sensing element 33, the light-concentrating element 34, and the light-receiving element 37 in a first direction X, where the first direction X coincides with the lateral direction. Furthermore, the light-emitting elements 352 are, for example, organic light-emitting diodes (OLEDs), which can function as light sources emitting red or green light.

[0116] The light emitting element 352 and the base 31 are connected to each other through the thin film transistor structure TFT3, and the light emitting element 352 is indirectly connected to the photosensitive element 33 through the thin film transistor structure TFT3 and the base 31.

[0117] The full width at half maximum (FWHM) of the light passing band of the optical interference filter 371 or the light absorption filter 372 satisfies the following condition: FWHM=10 [nanometers] or 40 [nanometers].

[0118] The refractive index of the condenser lens 341 is nL1, which satisfies the following conditions: nL1 = 1.61, 1.75, or 2.42.

[0119] The refractive index of the focusing lens 341 is nL1, and the glass transition temperature of the material of the focusing lens 341 is Tg1, which satisfies the following conditions: 100×nL1 / (650−Tg1)=0.68, 0.85, 4.13, or 5.15.

[0120] When a user's finger FG is placed on the protective layer 38, the light-emitting element 352 emits sensing light SL toward the finger FG. Due to the fingerprint pattern on the finger FG, the surface of the finger FG has valleys VL and ridges RG. The sensing light SL is reflected by the valleys VL and ridges RG by the light interference filter 371 and the light absorption filter 372. It is then directed to the convex surface 341a of the condenser lens 341 and becomes a converging light CL directed toward the photosensitive element 33. The converging light CL forms an image on the photosensitive element 33, which transmits information to a processor (not shown) that aggregates the images generated by the optical fingerprint recognition system into integer units for interpretation.

[0121] <Fourth embodiment>

[0122] Please refer to Figure 4 , depicts a schematic diagram of an optical fingerprint recognition system according to a fourth embodiment of the present invention. In this embodiment, the optical fingerprint recognition system 40 includes a base 41, a photosensitive element 43, a light-concentrating unit 44, a light-emitting layer 45, a light-receiving element 47, and a protective layer 48. The photosensitive element 43 is disposed above the base 41 in the stacking direction Z. The light-concentrating unit 44 is disposed above the photosensitive element 43 in the stacking direction Z. The light-emitting layer 45 is disposed above the photosensitive element 43 and the light-concentrating unit 44 in the stacking direction Z. The light-receiving element 47 is disposed above the light-concentrating unit 44 and the light-emitting layer 45 in the stacking direction Z. The protective layer 48 is disposed above the light-receiving layer 45 and the light-receiving element 47 in the stacking direction Z.

[0123] Specifically, the focusing unit 44 is located between the photosensitive element 43 and the protective layer 48. The focusing unit 44 includes a focusing lens 441. The focusing lens 441 has a convex surface 441a facing the protective layer 48 in the stacking direction Z.

[0124] The light-receiving element 47 is located between the light-sensing element 43 and the protective layer 48. The light-receiving element 47 and the light-sensing element 43 are aligned with each other in the stacking direction Z; that is, the orthographic projection of the light-receiving element 47 on the base 41 overlaps the orthographic projection of the light-sensing element 43 on the base 41. The light-receiving element 47 includes a light-receiving lens 471 and a light interference filter medium layer 472. The light-receiving lens 471 includes a light-absorbing material, which is a light-passing filter material. The light interference filter medium layer 472 is disposed on the mirror surface (not separately labeled) of the light-receiving lens 471, for example, by coating or plating, and is located between the light-receiving lens 471 and the protective layer 48.

[0125] The light-emitting layer 45 includes a screen unit 451, which in turn includes light-emitting elements 452. The light-emitting elements 452 are disposed lateral to the light-sensing element 43, the light-concentrating element 44, and the light-receiving element 47, with the lateral direction being different from the stacking direction Z. Specifically, the light-emitting elements 452 are disposed on the same side of the light-sensing element 43, the light-concentrating element 44, and the light-receiving element 47 in a first direction X, where the first direction X coincides with the lateral direction. Furthermore, the light-emitting elements 452 are, for example, organic light-emitting diodes (OLEDs), which can serve as light sources emitting red or green light.

[0126] The light emitting element 452 and the base 41 are connected to each other through the thin film transistor structure TFT4 , and the light emitting element 452 is indirectly connected to the photosensitive element 43 through the thin film transistor structure TFT4 and the base 41 .

[0127] The refractive index of the condenser lens 441 is nL1, which satisfies the following conditions: nL1 = 1.61, 1.75, or 2.42.

[0128] The refractive index of the focusing lens 441 is nL1, and the glass transition temperature of the material of the focusing lens 441 is Tg1, which satisfies the following conditions: 100×nL1 / (650−Tg1)=0.68, 0.85, 4.13, or 5.15.

[0129] The refractive index of the light-collecting lens 471 is nL2, and the glass transition temperature of the material of the light-collecting lens 471 is Tg2, which satisfies the following conditions: 100×nL2 / (650−Tg2)=0.68, 0.85, 4.13, or 5.15.

[0130] When a user's finger FG is placed on the protective layer 48, the light-emitting element 452 emits sensing light SL toward the finger FG. Due to the fingerprint pattern on the finger FG, the surface of the finger FG has valleys VL and ridges RG. The sensing light SL is reflected by the valleys VL and ridges RG onto the interference filter layer 472 and the light-collecting lens 471. It is then directed to the convex surface 441a of the condenser lens 441 and becomes a converging light CL directed toward the photosensitive element 43. The converging light CL forms an image on the photosensitive element 43, which transmits information to a processor (not shown). The image is then aggregated into integer units of the optical fingerprint recognition system for interpretation.

[0131] <Fifth embodiment>

[0132] Please refer to Figure 5, depicts a schematic diagram of an optical fingerprint recognition system according to a fifth embodiment of the present invention. In this embodiment, the optical fingerprint recognition system 50 includes a base 51, a photosensitive element 53, a light-concentrating unit 54, a light-emitting layer 55, a light-receiving element 57, and a protective layer 58. The photosensitive element 53 is disposed above the base 51 in the stacking direction Z. The light-concentrating unit 54 is disposed above the photosensitive element 53 in the stacking direction Z. The light-emitting layer 55 is disposed above the photosensitive element 53 and the light-concentrating unit 54 in the stacking direction Z. The light-receiving element 57 is disposed above the light-concentrating unit 54 and the light-emitting layer 55 in the stacking direction Z. The protective layer 58 is disposed above the light-receiving layer 55 and the light-receiving element 57 in the stacking direction Z.

[0133] Specifically, the light focusing unit 54 is located between the photosensitive element 53 and the protective layer 58. The light focusing unit 54 includes a dielectric layer 541 and a reflective layer 542. The reflective layer 542 surrounds the dielectric layer 541 with a line segment parallel to the stacking direction Z and passing through the geometric center of the dielectric layer 541 as an axis.

[0134] The light-receiving element 57 is located between the light-receiving element 53 and the protective layer 58. The light-receiving element 57 and the light-receiving element 53 are aligned with each other in the stacking direction Z. That is, the orthographic projection of the light-receiving element 57 on the base 51 overlaps the orthographic projection of the light-receiving element 53 on the base 51. The light-receiving element 57 includes a light-receiving lens 571. The light-receiving lens 571 has a convex surface 571a facing the protective layer 58 in the stacking direction Z.

[0135] The light-emitting layer 55 includes a screen unit 551, which in turn includes light-emitting elements 552. The light-emitting elements 552 are disposed lateral to the light-sensing element 53, the light-concentrating element 54, and the light-receiving element 57, with the lateral direction being different from the stacking direction Z. Specifically, the light-emitting elements 552 are disposed on the same side of the light-sensing element 53, the light-concentrating element 54, and the light-receiving element 57 in a first direction X, where the first direction X coincides with the lateral direction. Furthermore, the light-emitting elements 552 are, for example, organic light-emitting diodes (OLEDs), which can function as light sources emitting red or green light.

[0136] The light emitting element 552 and the base 51 are connected to each other through the thin film transistor structure TFT5, and the light emitting element 552 is indirectly connected to the photosensitive element 53 through the thin film transistor structure TFT5 and the base 51.

[0137] The refractive index of the dielectric layer 541 is nA, and the refractive index of the reflective layer 542 is nR, which satisfy the following conditions: nA=1.61, 1.77, 1.85, or 2.42; and nR=1.56.

[0138] The refractive index of the light-collecting lens 571 is nL2, and the glass transition temperature of the material of the light-collecting lens 571 is Tg2, which satisfies the following conditions: 100×nL2 / (650−Tg2)=0.68, 0.85, 4.13, or 5.15.

[0139] When a user's finger FG is placed on the protective layer 58, the light-emitting element 552 emits sensing light SL toward the finger FG. Due to the fingerprint pattern on the finger FG, the surface of the finger FG has valleys VL and ridges RG. The sensing light SL is reflected by the valleys VL and ridges RG onto the convex surface 571a of the light-collecting lens 571. It is then directed to the focusing unit 54 and becomes a converging light CL directed toward the photosensitive element 53. The converging light CL forms an image on the photosensitive element 53, which transmits information to a processor (not shown) that aggregates the images generated by the optical fingerprint recognition system into integer units for interpretation.

[0140] <Sixth embodiment>

[0141] Please refer to Figure 6 , depicts a schematic diagram of an optical fingerprint recognition system according to a sixth embodiment of the present invention. In this embodiment, the optical fingerprint recognition system 60 includes a base 61, a photosensitive element 63, a light-concentrating unit 64, a light-emitting layer 65, a touch layer 66, a light-receiving element 67, and a protective layer 68. The photosensitive element 63 is disposed above the base 61 in the stacking direction Z. The light-concentrating unit 64 is disposed above the photosensitive element 63 in the stacking direction Z. The light-emitting layer 65 is disposed above the photosensitive element 63 and a portion of the light-concentrating unit 64 in the stacking direction Z. The touch layer 66 is disposed above the light-emitting layer 65 in the stacking direction Z. The light-receiving element 67 is disposed above the light-concentrating unit 64, the light-emitting layer 65, and the touch layer 66 in the stacking direction Z, such that the touch layer 66 is located between the light-receiving element 67 and the light-concentrating unit 64. The protective layer 68 is disposed above the light-emitting layer 65 and the light-receiving element 67 in the stacking direction Z.

[0142] Specifically, the focusing unit 64 is located between the photosensitive element 63 and the protective layer 68. The focusing unit 64 includes a dielectric layer 641 and a reflective layer 642. The reflective layer 642 surrounds the dielectric layer 641 with a line segment parallel to the stacking direction Z and passing through the geometric center of the dielectric layer 641 as an axis.

[0143] The light-concentrating unit 64 further includes an upper dielectric layer 643 and an upper reflective layer 644. The upper reflective layer 644 surrounds the outer side of the upper dielectric layer 643, with a line segment parallel to the stacking direction Z and passing through the geometric center of the upper dielectric layer 643 serving as an axis. The upper dielectric layer 643 and the upper reflective layer 644 are located above the dielectric layer 641 and the reflective layer 642. It is worth noting that the material of the upper dielectric layer 643 is different from that of the dielectric layer 641, while the material of the upper reflective layer 644 can be the same as that of the reflective layer 642.

[0144] The light-receiving element 67 is located between the light-receiving element 63 and the protective layer 68. The light-receiving element 67 and the light-receiving element 63 are aligned with each other in the stacking direction Z. That is, the orthographic projection of the light-receiving element 67 on the base 61 overlaps the orthographic projection of the light-receiving element 63 on the base 61. The light-receiving element 67 includes a light-receiving lens 671. The light-receiving lens 671 has a convex surface 671a facing the protective layer 68 in the stacking direction Z.

[0145] The light-emitting layer 65 includes a screen unit 651, which in turn includes light-emitting elements 652. The light-emitting elements 652 are disposed lateral to the light-sensing element 63, the light-concentrating element 64, and the light-receiving element 67, with the lateral direction being different from the stacking direction Z. Specifically, the light-emitting elements 652 are disposed on the same side of the light-sensing element 63, the light-concentrating element 64, and the light-receiving element 67 in a first direction X, where the first direction X coincides with the lateral direction. Furthermore, the light-emitting elements 652 are, for example, organic light-emitting diodes (OLEDs), which can serve as light sources emitting red or green light.

[0146] The light emitting element 652 and the base 61 are connected to each other through the thin film transistor structure TFT6, and the light emitting element 652 is indirectly connected to the photosensitive element 63 through the thin film transistor structure TFT6 and the base 61.

[0147] The refractive index of the dielectric layer 641 is nA, and the refractive index of the reflective layer 642 is nR, which satisfy the following conditions: nA=1.85 or 2.42; and nR=1.56.

[0148] The refractive index of the upper dielectric layer 643 is nB, and the refractive index of the upper reflective layer 644 is nR′, which satisfy the following conditions: nB=1.61 or 1.77; and nR′=1.56.

[0149] The refractive index of the light-collecting lens 671 is nL2, and the glass transition temperature of the material of the light-collecting lens 671 is Tg2, which satisfies the following conditions: 100×nL2 / (650−Tg2)=0.68, 0.85, 4.13, or 5.15.

[0150] When a user's finger FG is placed on the protective layer 68, the light-emitting element 652 emits sensing light SL toward the finger FG. Due to the fingerprint pattern on the finger FG, the surface of the finger FG has valleys VL and ridges RG. The sensing light SL is reflected by the valleys VL and ridges RG onto the convex surface 671a of the light-collecting lens 671. It is then directed to the focusing unit 64 and becomes a converging light CL directed toward the photosensitive element 63. The converging light CL forms an image on the photosensitive element 63, which transmits information to a processor (not shown) that aggregates the images generated by the optical fingerprint recognition system into integer units for interpretation.

[0151] <Seventh embodiment>

[0152] Please refer to Figure 7 , depicts a schematic diagram of an optical fingerprint recognition system according to a seventh embodiment of the present invention. In this embodiment, the optical fingerprint recognition system 70 includes a base 71, a photosensitive element 73, a light-concentrating unit 74, a light-emitting layer 75, a light-receiving element 77, a light-guiding layer 79, and a protective layer 78. The photosensitive element 73 is disposed above the base 71 in the stacking direction Z. The light-concentrating unit 74 is disposed above the photosensitive element 73 in the stacking direction Z. The light-emitting layer 75 is disposed above the photosensitive element 73 and the light-concentrating unit 74 in the stacking direction Z. The light-receiving element 77 is disposed above the light-concentrating unit 74 and the light-emitting layer 75 in the stacking direction Z. The light-guiding layer 79 is disposed above the light-emitting layer 75 and the light-receiving element 77 in the stacking direction Z. The protective layer 78 is disposed above the light-emitting layer 75 and the light-guiding layer 79 in the stacking direction Z.

[0153] Specifically, the focusing unit 74 is located between the photosensitive element 73 and the protective layer 78. The focusing unit 74 includes a dielectric layer 741 and a reflective layer 742. The reflective layer 742 surrounds the dielectric layer 741 with a line segment parallel to the stacking direction Z and passing through the geometric center of the dielectric layer 741 as an axis.

[0154] The light-receiving element 77 is located between the light-receiving element 73 and the protective layer 78. The light-receiving element 77 and the light-receiving element 73 are aligned with each other in the stacking direction Z. That is, the orthographic projection of the light-receiving element 77 on the base 71 overlaps the orthographic projection of the light-receiving element 73 on the base 71. The light-receiving element 77 includes a light-receiving lens 771. The light-receiving lens 771 has a convex surface 771a facing the protective layer 78 in the stacking direction Z.

[0155] The light-emitting layer 75 includes a screen unit 751, which in turn includes light-emitting elements 752. The light-emitting elements 752 are disposed lateral to the light-sensing element 73, the light-concentrating element 74, and the light-receiving element 77, with the lateral direction being different from the stacking direction Z. Specifically, the light-emitting elements 752 are disposed on the same side of the light-sensing element 73, the light-concentrating element 74, and the light-receiving element 77 in a first direction X, where the first direction X coincides with the lateral direction. Furthermore, the light-emitting elements 752 are, for example, organic light-emitting diodes (OLEDs), which can function as light sources emitting red or green light.

[0156] The light emitting element 752 and the base 71 are connected to each other through the thin film transistor structure TFT7, and the light emitting element 752 is indirectly connected to the photosensitive element 73 through the thin film transistor structure TFT7 and the base 71.

[0157] The refractive index of the dielectric layer 741 is nA, and the refractive index of the reflective layer 742 is nR, which satisfy the following conditions: nA=1.61, 1.77, 1.85, or 2.42; and nR=1.56.

[0158] The refractive index of the light-collecting lens 771 is nL2, and the glass transition temperature of the material of the light-collecting lens 771 is Tg2, which satisfies the following conditions: 100×nL2 / (650−Tg2)=0.68, 0.85, 4.13, or 5.15.

[0159] When a user's finger FG is placed on the protective layer 78, the light-emitting element 752 emits sensing light SL toward the finger FG. Due to the fingerprint pattern on the finger FG, the surface of the finger FG has valleys VL and ridges RG. The sensing light SL is reflected by the valleys VL and ridges RG onto the convex surface 771a of the light-collecting lens 771. It is then directed to the focusing unit 74 and becomes a converging light CL that travels toward the photosensitive element 73. The converging light CL forms an image on the photosensitive element 73, transmitting information to a processor (not shown). The image generated by the optical fingerprint recognition system is then aggregated and interpreted. Furthermore, the light guide layer 79 (Light Guide Layer) includes another light-emitting element 791. Light-emitting element 791 can also emit another sensing light (not shown) to replace or supplement the light source generated by the light-emitting element 752. Part of this sensing light passes through the protective layer 78 and is then reflected and directed to become another converging light (not shown) that travels toward the photosensitive element 73. Another convergent light can also be imaged on the photosensitive element 73 to transmit information to the processor, and then be interpreted after the image generated by the convergent light CL and another convergent light in the optical fingerprint recognition system of integer units is aggregated.

[0160] <Eighth Embodiment>

[0161] Please refer to Figure 8 and Figure 9 ,in Figure 8 FIG. 1 is a schematic diagram illustrating an application of an optical fingerprint recognition device according to an eighth embodiment of the present invention, and FIG. Figure 9 Draw Figure 8 Schematic diagram of an optical fingerprint recognition device identifying a fingerprint.

[0162] In this embodiment, the electronic device 1 is a smartphone with a biometric recognition function. The electronic device 1 includes an imaging device 101 and a display device 102. The imaging device 101 serves as the front lens of the electronic device 1 to provide a selfie function. The display device 102 includes a screen display layer 1021, a screen touch layer 1022, and a transparent flat panel 1023. The screen display layer 1021 can display images. The screen display layer 1021 can use an OLED or an active-matrix organic light-emitting diode (AMOLED). The screen touch layer 1022 is integrated into the structure of the screen display layer 1021 and is located on the same layer as the screen display layer 1021. The screen touch layer 1022 can have a touch screen function, thereby eliminating the need for an additional input device and making operation more intuitive. The transparent flat panel 1023 is disposed above the screen touch layer 1022. The transparent flat panel 1023 can provide a protective function, thereby reducing the use of additional components. In addition, the display device 102 further includes an optical fingerprint recognition device 1026. The optical fingerprint recognition device 1026 includes a plurality of optical fingerprint recognition systems 20 of the second embodiment described above, wherein Figure 9 Only two optical fingerprint recognition systems 20 are shown for illustrative purposes, and Figure 9 The optical fingerprint recognition system 20 and finger FG are not drawn to scale. As described in the second embodiment, the optical fingerprint recognition system 20 not only has the fingerprint recognition function, but also includes a screen unit 251 that can display images, a touch layer 26 that can also provide touchscreen functionality, and a protective layer 28 that can also provide protection. The optical fingerprint recognition device 1026 can also be configured with an optical fingerprint recognition system of other embodiments, and the present invention is not limited thereto.

[0163] Please refer to Figures 10 to 12 ,in Figure 10 Draw Figure 8 The configuration relationship of the optical fingerprint recognition device is shown above. Figure 11 Draw Figure 10 A three-dimensional schematic diagram of a light-receiving element of an optical fingerprint recognition device, and Figure 12 Draw Figure 10 Schematic diagram of the optical fingerprint recognition device.

[0164] The optical fingerprint recognition device 1026 includes a plurality of light receiving elements 27, a plurality of light emitting elements 252, a light focusing layer 24 and a plurality of light sensing elements 23. Figure 11 It can be seen that the light receiving element 27 is a long strip light receiving lens 271, and the light receiving lens 271 has a convex surface 271a. Figure 12 It can be seen that the light receiving element 27 is located above the light emitting element 252 in the stacking direction Z. Figure 10 and Figure 12 As can be seen, the light-receiving elements 27 are arranged at equal intervals in the first direction X, and each light-receiving element 27 is located between two adjacent light-emitting elements 252 in the first direction X. The light-emitting elements 252 are arranged at equal intervals in both the first direction X and the second direction Y, with the second direction Y being substantially perpendicular to both the first direction X and the stacking direction Z. The light-concentrating layer 24 is filled with a medium 241, and therefore the light-concentrating layer 24 can also be referred to as a light-concentrating medium layer. The photosensitive elements 23 are located below the light-emitting elements 252 in the stacking direction Z, and are arranged at equal intervals in the first direction X. Specifically, each photosensitive element 23 is located between two adjacent light-emitting elements 252 in the first direction X, and is aligned with the light-receiving element 27 in the stacking direction Z, receiving the converging light CL from the light-receiving element 27 to form an image on the photosensitive element 23.

[0165] In this embodiment, the light receiving element 27 and the light emitting element 252 are as follows: Figure 10 The configurations in the embodiment are not intended to limit the present invention. The following ninth to eleventh embodiments provide more configurations.

[0166] Ninth embodiment

[0167] Please refer to Figure 13 , depicting a top view schematic diagram of the configuration of an optical fingerprint recognition device according to a ninth embodiment of the present invention. The following description focuses solely on the differences between the ninth embodiment and the preceding embodiments, while the remaining similarities are omitted. The optical fingerprint recognition device 2026 includes a plurality of light-receiving elements 2027 and a plurality of light-emitting elements 2028.

[0168] The light-receiving elements 2027 are convex lenses. The light-receiving elements 2027 are arranged at equal intervals in the first direction X and the second direction Y. The light-emitting elements 2028 are arranged at equal intervals in the first direction X and the second direction Y. Each light-receiving element 2027 is located between two adjacent light-emitting elements 2028 in the first direction X and the second direction Y, and the light-receiving elements 2027 and the light-emitting elements 2028 are offset relative to each other in the first direction X and the second direction Y.

[0169] <Tenth embodiment>

[0170] Please refer to Figure 14, depicting a top view schematic diagram of the configuration of an optical fingerprint recognition device according to the tenth embodiment of the present invention. The following description focuses solely on the differences between the tenth embodiment and the preceding embodiments, while the remaining similarities are omitted. The optical fingerprint recognition device 3026 includes a plurality of light-receiving elements 3027 and a plurality of light-emitting elements 3028.

[0171] The light-receiving elements 3027 are convex lenses. The light-receiving elements 3027 are arranged at equal intervals in the first direction X and the second direction Y. The light-emitting elements 3028 are arranged at equal intervals in the first direction X and the second direction Y. The light-receiving elements 3027 and the light-emitting elements 3028 are aligned in the first direction X and arranged alternately.

[0172] <Eleventh Embodiment>

[0173] Please refer to Figure 15 , depicting a top view schematic diagram of the configuration of an optical fingerprint recognition device according to the eleventh embodiment of the present invention. The following description focuses solely on the differences between the eleventh embodiment and the preceding embodiments, while the remaining similarities are omitted. The optical fingerprint recognition device 4026 includes a plurality of light-receiving elements 4027 and a plurality of light-emitting elements 4028.

[0174] The light-receiving elements 4027 are convex lenses. The light-receiving elements 4027 are arranged at equal intervals in the first direction X and the second direction Y. The light-emitting elements 4028 are arranged at equal intervals in the first direction X and the second direction Y. The light-receiving elements 4027 and the light-emitting elements 4028 are aligned in the second direction Y and arranged alternately.

[0175] The optical fingerprint recognition systems 10-70 and optical fingerprint recognition devices 1026-4026 of the present invention are suitable for under-screen fingerprint recognition, combining excellent aberration correction with high-quality imaging. However, their application is not limited to smartphones. For example, the optical fingerprint recognition systems 10-70 and optical fingerprint recognition devices 1026-4026 can also be used in various electronic devices such as tablet computers, portable video recorders, and multi-lens devices.

[0176] Although the present invention is disclosed above with reference to the preferred embodiments, they are not intended to limit the present invention. Any person skilled in the art may make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of patent protection of the present invention shall be determined by the scope of protection of the claims attached to this specification.

Claims

1. An optical fingerprint recognition system, characterized in that: Include: a base; a photosensitive element, disposed above the base; a light-emitting layer disposed above the photosensitive element, wherein the light-emitting layer comprises a light-emitting element; and a protective layer disposed above the light-emitting layer; The optical fingerprint recognition system further comprises, between the photosensitive element and the protective layer: a light-focusing unit, disposed above the light-sensing element; and a light-receiving element, disposed above the light-collecting unit; The optical fingerprint recognition system has a stacking direction, and the base, the photosensitive element, the light focusing unit, the light receiving element, and the protective layer are stacked one on top of another in the stacking direction; The light emitting element is disposed on a side direction of the light sensing element, the light focusing unit and the light receiving element, and the side direction is different from the stacking direction.

2. The optical fingerprint recognition system according to claim 1, wherein: The light receiving element includes a light interference filter layer and a light absorption filter layer. The light interference filter layer is used to generate a filter band shift according to the change of the incident light angle, and the light absorption filter layer is a light passing filter layer.

3. The optical fingerprint recognition system according to claim 2, characterized in that: The light passing band of the light absorption filter layer is from visible light to near infrared light, and the full width at half maximum of the light passing band of the light absorption filter layer is FWHM, which meets the following conditions: FWHM < 100 nm.

4. The optical fingerprint recognition system according to claim 1, wherein: The light-collecting element includes a light-collecting lens and a light interference filter medium layer. The light-collecting lens includes a light-absorbing material, which is a light-passing filter material. The light interference filter medium layer is located on the mirror surface of the light-collecting lens. The light interference filter medium layer is used to generate a filter band shift in response to changes in the angle of incident light.

5. The optical fingerprint recognition system according to claim 1, wherein: The light focusing unit includes a medium layer and a reflection layer, and the reflection layer surrounds the outer side of the medium layer.

6. The optical fingerprint recognition system according to claim 5, characterized in that: The refractive index of the dielectric layer is nA, which satisfies the following conditions: 1.60 <nA<5.0。 7. The optical fingerprint recognition system according to claim 5, characterized in that: The refractive index of the dielectric layer is nA, and the refractive index of the reflective layer is nR, which satisfy the following conditions: nR <nA。 8. The optical fingerprint recognition system according to claim 5, wherein: The light focusing unit further includes an upper medium layer and an upper reflection layer. The upper reflection layer surrounds the outer side of the upper medium layer, and the upper medium layer and the upper reflection layer are located above the medium layer and the reflection layer.

9. The optical fingerprint recognition system according to claim 8, characterized in that: The refractive index of the dielectric layer is nA, and the refractive index of the upper dielectric layer is nB, which satisfy the following conditions: nB <nA。 10. The optical fingerprint recognition system according to claim 1, wherein: The focusing unit includes a focusing lens, the refractive index of the focusing lens is nL1, which satisfies the following conditions: 1.60 <nL1<2.50。 11. The optical fingerprint recognition system according to claim 10, wherein: The light receiving element includes a light receiving lens. The refractive index of the condensing lens is nL1, the refractive index of the light receiving lens is nL2, the refractive index of one of the condensing lens and the light receiving lens is nLi, the glass transition temperature of the material of the condensing lens is Tg1, the glass transition temperature of the material of the light receiving lens is Tg2, and the glass transition temperature of the material of one of the condensing lens and the light receiving lens is Tgi. At least one of the condensing lens and the light receiving lens satisfies the following conditions: 0<100×nLi / (650-Tgi)<8, where i=1 or 2.

12. The optical fingerprint recognition system according to claim 1, wherein: The invention also comprises a light guide layer, wherein the light guide layer is arranged above the light emitting layer.

13. The optical fingerprint recognition system according to claim 1, wherein: The light emitting element is used to emit red light or green light.

14. The optical fingerprint recognition system according to claim 1, wherein: The light receiving element and the light sensing element are aligned with each other in the stacking direction of the optical fingerprint recognition system.

15. The optical fingerprint recognition system according to claim 1, wherein: The light emitting element is arranged on the same side of the light sensing element, the light focusing unit and the light receiving element.

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

17. The optical fingerprint recognition system according to claim 1, wherein: The photosensitive element and the light emitting element are connected to each other through a thin film transistor structure.

18. The optical fingerprint recognition system according to claim 1, wherein: It also includes a touch layer, wherein the touch layer is located between the light collecting element and the light focusing unit.

19. An optical fingerprint recognition system, characterized in that: Include: a base; a photosensitive element, disposed above the base; a light-gathering layer disposed above the photosensitive element; a light-emitting layer disposed above the light-concentrating layer, wherein the light-emitting layer comprises a light-emitting element; a light-receiving element disposed above the light-emitting layer; as well as a protective layer disposed above the light receiving element; The optical fingerprint recognition system has a stacking direction, and the base, the photosensitive element, the light focusing unit, the light receiving element, and the protective layer are stacked one on top of another in the stacking direction; The light emitting element is disposed on a side direction of the light sensing element and the light receiving element, and the side direction is different from the stacking direction.

20. The optical fingerprint recognition system according to claim 19, wherein: The light-concentrating layer includes a medium having a refractive index of nA, which satisfies the following conditions: 1.60 <nA<5.0。 21. The optical fingerprint recognition system according to claim 19, wherein: The light receiving element and the light sensing element are aligned with each other in the stacking direction of the optical fingerprint recognition system.

22. An optical fingerprint recognition device, characterized in that: Include: a plurality of light-emitting elements, wherein the plurality of light-emitting elements are respectively 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-receiving elements, wherein the plurality of light-receiving elements are located above the plurality of light-emitting elements in a stacking direction of the optical fingerprint recognition device, the stacking direction being substantially perpendicular to the first direction and the second direction, the plurality of light-receiving elements being equally spaced in the first direction, and each of the plurality of light-receiving elements being located between each two adjacent light-emitting elements in the first direction; as well as A plurality of photosensitive elements, wherein the plurality of photosensitive elements are located below the plurality of light-emitting elements in the stacking direction, the plurality of photosensitive elements are arranged at equal intervals in the first direction, and each of the plurality of photosensitive elements is located between two adjacent plurality of light-emitting elements in the first direction.

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

24. The optical fingerprint recognition device according to claim 22, wherein: The device further comprises a light-gathering medium layer, wherein the light-gathering medium layer is located above the plurality of photosensitive elements in the stacking direction.

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