Fingerprint collection device and electronic device

Abstract

The present application discloses a fingerprint collection device and a display device, belonging to the field of sensor technology. The fingerprint collection device includes: a substrate; a plurality of photoelectric conversion units located on the substrate; a first shading pattern located on the substrate provided with a plurality of photoelectric conversion units, the first shading pattern including at least one first shading block, the first shading block having a first opening, the orthographic projection of the first opening on the first shading block on the substrate is located in the orthographic projection of the first photoelectric conversion unit corresponding to the first shading block on the substrate. The present application greatly reduces the light irradiated on the photoelectric conversion unit through the opening on the shading block, thereby improving the ability of the fingerprint collection device to resist strong light. Since the fingerprint collection device does not need to resist strong light through a prism structure, the overall structure is smaller and thinner. The problem of thick thickness of the fingerprint collection device in the related art is solved, and the effect of reducing the overall thickness of the fingerprint collection device is achieved.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to a fingerprint collection device and an electronic device. Background Art

[0002] The fingerprint collection device is a device that can collect fingerprint information. Subsequently, various functions such as security verification can be realized based on the collected fingerprint information.

[0003] A fingerprint collection device includes a substrate, a light-emitting unit, a prism structure and a fingerprint sensor located on the substrate. The light-emitting unit emits light to the outside, and the light is reflected to the prism structure after irradiating the finger, and then the prism structure guides the light to the fingerprint sensor. The prism structure can prevent strong external light from directly irradiating the fingerprint sensor, causing the fingerprint sensor to malfunction, thereby achieving the function of anti-strong light.

[0004] However, since the size of the prism structure is usually large, the overall size and thickness of the fingerprint collection device are large. Summary of the invention

[0005] The embodiment of the present application provides a fingerprint collection device and an electronic device. The technical solution is as follows:

[0006] According to one aspect of the present application, a fingerprint collection device is provided, the fingerprint collection device comprising:

[0007] substrate substrate;

[0008] and, a plurality of photoelectric conversion units located on the substrate;

[0009] And, a first shading pattern located on the base substrate on which the multiple photoelectric conversion units are provided, the first shading pattern includes at least one first shading block corresponding to at least one first photoelectric conversion unit among the multiple photoelectric conversion units, the first shading block has a first opening, and the orthographic projection of the first opening on the first shading block on the base substrate is located in the orthographic projection of the first photoelectric conversion unit corresponding to the first shading block on the base substrate.

[0010] Optionally, the fingerprint collection device further includes:

[0011] A second light-shielding pattern is located on the base substrate on which the first light-shielding pattern is provided, the second light-shielding pattern includes at least one second light-shielding block corresponding to the at least one first light-shielding block, the second light-shielding block has a second opening, the orthographic projection of the second opening on the second light-shielding block on the base substrate is connected to the orthographic projection of the first opening of the first light-shielding block corresponding to the second light-shielding block on the base substrate, or the orthographic projection of the second opening on the second light-shielding block on the base substrate and the orthographic projection of the first opening of the first light-shielding block corresponding to the second light-shielding block on the base substrate have an overlapping area.

[0012] Optionally, the fingerprint collection device further includes a transparent spacer layer, and the transparent spacer layer is located between the first light-shielding pattern and the second light-shielding pattern.

[0013] Optionally, the first light shielding block further has at least one third opening, and the orthographic projection of the at least one third opening on the base substrate is located in the orthographic projection of the first photoelectric conversion unit on the base substrate.

[0014] Optionally, the second light-shielding block also has at least one fourth opening corresponding one-to-one to the at least one third opening, and the orthographic projection of the fourth opening on the substrate is connected to the orthographic projection of the third opening corresponding to the fourth opening on the substrate, or the orthographic projection of the fourth opening on the substrate and the orthographic projection of the third opening corresponding to the fourth opening on the substrate have an overlapping area.

[0015] Optionally, each of the plurality of photoelectric conversion units is the first photoelectric conversion unit.

[0016] Optionally, the fingerprint collection device further includes:

[0017] a transparent insulating layer located on the base substrate provided with the second light-shielding pattern;

[0018] And, a transparent conductive layer is located on the base substrate provided with the transparent insulating layer, and the transparent conductive layer is electrically connected to the ground point.

[0019] Optionally, the fingerprint collection device further includes a plurality of thin film transistors located on the substrate, the thin film transistors include a first electrode, a second electrode and a third electrode for controlling the on-off between the first electrode and the second electrode, and the photoelectric conversion unit is electrically connected to the second electrode.

[0020] Optionally, the fingerprint collection device further includes a common electrode, which is located on the base substrate on which the multiple photoelectric conversion units are disposed and is electrically connected to the multiple photoelectric conversion units.

[0021] Optionally, a material of the first light-shielding pattern includes metal, and the first light-shielding pattern is located on the common electrode and is electrically connected to the common electrode.

[0022] Optionally, the fingerprint collection device further includes a backlight plate, and the backlight plate is located on a side of the substrate away from the plurality of photoelectric conversion units;

[0023] The second pole is made of a light-shielding conductive material, the photoelectric conversion unit is located on the second pole, and the orthographic projection of the photoelectric conversion unit on the backlight panel is located in the orthographic projection of the second pole on the backlight panel.

[0024] Optionally, the fingerprint collection device further comprises a light shielding film arranged at the same layer as the third electrode, and the orthographic projection of the photoelectric conversion unit on the backlight plate is located in the orthographic projection of the light shielding film on the backlight plate.

[0025] Optionally, the first light-shielding pattern and the second light-shielding pattern are made of a molybdenum layer, an aluminum layer and a composite metal layer consisting of a molybdenum layer, or the first light-shielding pattern and the second light-shielding pattern are made of an aluminum layer, or the first light-shielding pattern and the second light-shielding pattern are made of a molybdenum layer.

[0026] According to another aspect of the present application, an electronic device is provided, and the electronic device includes the above-mentioned fingerprint collection device.

[0027] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0028] A fingerprint collection device is provided, which includes a photoelectric conversion unit and a light shielding layer located on the photoelectric conversion unit, wherein the light shielding layer has an opening, through which the light irradiated on the photoelectric conversion unit can be greatly reduced, so as to avoid the energy of the light irradiated on the photoelectric conversion unit per unit time exceeding the threshold acceptable to the photoelectric conversion unit, thereby improving the ability of the fingerprint collection device to resist strong light. Since the fingerprint collection device does not need to resist strong light through a prism structure, the overall structure is smaller and thinner. The problem of the fingerprint collection device having a large overall size and a thick thickness in the related art is solved, and the effect of reducing the overall thickness of the fingerprint collection device is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 It is a schematic diagram of the principle of a fingerprint collection device;

[0031] Figure 2 It is a structural schematic diagram of a fingerprint collection device shown in an embodiment of the present application;

[0032] Figure 3 yes Figure 2 A schematic diagram of a top view structure of the fingerprint collection device shown;

[0033] Figure 4 It is a structural schematic diagram of another fingerprint collection device shown in an embodiment of the present application;

[0034] Figure 5 It is a structural schematic diagram of another fingerprint collection device shown in an embodiment of the present application;

[0035] Figure 6 is a schematic diagram of a top view structure of a fingerprint collection device shown in an embodiment of the present application;

[0036] Figure 7 yes Figure 6 The structure diagram of the fingerprint collection device shown does not show the first light shielding block;

[0037] Figure 8 yes Figure 6 A cross-sectional schematic diagram of a fingerprint collection device shown;

[0038] Fig. 9 It is a schematic diagram of a top view structure of a fingerprint collection device provided in an embodiment of the present application;

[0039] Fig.10 yes Fig. 9 A cross-sectional schematic diagram of a fingerprint collection device shown;

[0040] Fig.11 It is a structural schematic diagram of another fingerprint collection device provided in an embodiment of the present application;

[0041] Fig.12 It is a structural schematic diagram of another fingerprint collection device provided in an embodiment of the present application;

[0042] Fig.13 yes Figure 4 A schematic diagram of an application structure of a fingerprint collection device is shown.

[0043] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0045] Fingerprints are the lines formed by the bumps and grooves on the end of human fingers (the protruding parts are called ridges, and the concave parts are called valleys. The lines of ridges and valleys can constitute the fingerprint of the finger). Usually, each person's fingerprint is unique, and the function of security verification can be achieved by comparing fingerprints.

[0046] In the technology of applying fingerprints, an important process is the collection of fingerprints. A fingerprint collection device collects fingerprints through optical technology. For fingerprint collection devices that collect fingerprints through optical technology, the intensity of external light (such as sunlight or light emitted by various lighting sources) may be too large. If the strong light from the outside directly shines on the sensor in the fingerprint collection device, the light energy received by the sensor per unit time will far exceed the maximum threshold of the energy that the sensor can receive, which will make it difficult for the fingerprint collection device to collect fingerprints normally and cannot operate normally. For this type of problem, a solution can be as follows Figure 1 shown.

[0047] Figure 1 The fingerprint collection device 10 includes a light source 11, a prism 12 and a fingerprint sensor 13.

[0048] The prism 12 includes three surfaces. When the finger F is pressed on the first surface of the prism 12, the light beam emitted by the light source 11 irradiates the second surface of the prism 12 and irradiates the finger F. The light beam is reflected by the finger F and emitted from the third surface of the prism 12, and then irradiates the fingerprint sensor 13 located outside the third surface of the prism 12. The fingerprint sensor 13 can be an image sensor (such as a charge-coupled device (CCD)), and then the fingerprint sensor 13 can obtain the information of the texture of the finger F. And due to the existence of the optical path formed by the light source 11, the prism 12 and the fingerprint sensor 13, it is difficult for strong light from the outside to directly irradiate.

[0049] However, the size of the prism 12 is usually large, and the optical path formed by the light source 11, the prism 12 and the fingerprint sensor 13 also has strict requirements on the layout position of each device, which results in the overall volume and thickness of the fingerprint collection device being large, and difficult to be used in various thin and light devices, and the scope of application is narrow.

[0050] The embodiments of the present application provide a fingerprint collection device and a display device, which can realize the function of collecting fingerprints.

[0051] Figure 2 : is a schematic diagram of the structure of a fingerprint collection device shown in an embodiment of the present application. The fingerprint collection device 20 includes:

[0052] Base substrate 21.

[0053] And, a plurality of photoelectric conversion units 22 are located on the base substrate 21 .

[0054] And, a first light shielding pattern 23 located on a base substrate 21 provided with a plurality of photoelectric conversion units 22, the first light shielding pattern 23 includes at least one first light shielding block 231 corresponding to at least one first photoelectric conversion unit 221 among the plurality of photoelectric conversion units 22, the first light shielding block 231 has a first opening k1, and the orthographic projection of the first opening k1 on the base substrate 21 is located in the orthographic projection of the first photoelectric conversion unit 221 corresponding to the first light shielding block 231 on the base substrate 21. That is, part or all of the light passing through the first opening k1 can be irradiated onto the first photoelectric conversion unit 221, and the first opening k1 can be an opening corresponding to the first photoelectric conversion unit 221.

[0055] It should be noted that the first photoelectric conversion unit 221 may be a type of photoelectric conversion unit among the plurality of photoelectric conversion units 22, and such photoelectric conversion unit has a corresponding first shading block 231 in the first shading pattern 23, that is, among the plurality of photoelectric conversion units 22, some photoelectric conversion units may exist without corresponding first shading blocks, and another part of photoelectric conversion units may exist with corresponding first shading blocks, or each photoelectric conversion unit among the plurality of photoelectric conversion units 22 is a first photoelectric conversion unit. In this case, each photoelectric conversion unit among the plurality of photoelectric conversion units has a corresponding first shading block 231 in the first shading pattern 23 ( Figure 2 This structure is shown).

[0056] The photoelectric conversion unit 22 may include a photoelectric conversion material, which is a material that can convert light energy into electrical energy through the photovoltaic effect.

[0057] When the ridges and valleys of a finger reflect light, they will reflect light of different intensities due to their different shapes and heights. The fingerprint collection device provided in the embodiment of the present application includes multiple photoelectric conversion units. The light received by these multiple photoelectric conversion units can be the light reflected by different areas of the finger. Then, based on parameters such as the intensity of the light reflected from different areas, the patterns of the ridges and valleys on the finger can be determined.

[0058] For example, Figure 3 As shown, it is Figure 2 A schematic diagram of a top view of the fingerprint collection device shown (in order to clearly show the photoelectric conversion unit, Figure 3 The first shading pattern is not shown), a plurality of photoelectric conversion units 22 may be arranged in an array on the base substrate 21, such as in the form of x rows and y columns. Correspondingly, the first shading pattern is also provided with openings corresponding to each photoelectric conversion unit, so that more accurate fingerprint information can be obtained.

[0059] Of course, the "fingerprint" described in the embodiments of the present application is not a fingerprint in a narrow sense. The "fingerprint" may include not only finger prints, but also various human body prints such as knuckle prints and palm prints. The embodiments of the present application do not limit this.

[0060] In summary, the embodiment of the present application provides a fingerprint acquisition device, which includes a photoelectric conversion unit and a light shielding layer located on the photoelectric conversion unit, and the light shielding layer has an opening, through which the light irradiated on the photoelectric conversion unit can be greatly reduced, and the energy of the light irradiated on the photoelectric conversion unit is prevented from exceeding the threshold acceptable to the photoelectric conversion unit, thereby improving the ability of the fingerprint acquisition device to resist strong light. Since the fingerprint acquisition device does not need to resist strong light through a prism structure, the overall structure is smaller and thinner. The problem of the fingerprint acquisition device being large in overall size and thick in thickness in the related art is solved, and the effect of reducing the overall thickness of the fingerprint acquisition device is achieved.

[0061] The embodiment of the present application provides a fingerprint collection device including a photoelectric conversion unit and a light-shielding layer with an opening. The photoelectric conversion unit is shielded over a large area by the light-shielding layer so that light can only be irradiated onto the photoelectric conversion unit through the opening. This can greatly reduce the energy of light received by the photoelectric conversion unit and reduce the possibility of external strong light irradiating onto the photoelectric conversion unit and causing the photoelectric conversion unit to malfunction. The fingerprint collection device provides a new way to resist strong light, and because this method does not require the provision of a prism and the optical path of the prism, the structure of the entire fingerprint collection device is relatively simple and the size is relatively small, making it easy to be applied to various thin and light devices, thereby greatly improving the scope of application of the fingerprint collection device.

[0062] Figure 4 is a schematic diagram of the structure of another fingerprint collection device shown in an embodiment of the present application. Figure 1 Some adjustments have been made based on the fingerprint collection device shown.

[0063] Optionally, the fingerprint collection device 20 further includes:

[0064] A second light-shielding pattern 24 is located on a base substrate 21 provided with a first light-shielding pattern 23, the second light-shielding pattern 24 includes at least one second light-shielding block 241 corresponding to at least one first light-shielding block 231, the second light-shielding block 241 has a second opening k2, the orthographic projection of the second opening k2 on the base substrate 21 is connected to the orthographic projection of the first opening k1 of the first light-shielding block 231 corresponding to the second light-shielding block 241 on the base substrate 21 (under this structure, the first opening and the second opening are just offset), or, the orthographic projection of the second opening k2 of the second light-shielding block 241 on the base substrate 21 and the orthographic projection of the first opening k1 of the first light-shielding block 231 corresponding to the second light-shielding block 241 on the base substrate have an overlapping area (under this structure, if the first opening and the second opening are exactly the same in size and shape, the first opening and the second opening may completely overlap, or only a small part may overlap if the first opening and the second opening are different in size and shape). Figure 4 The structure shown is that the orthographic projection of the second opening k2 on the base substrate 21 is connected to the orthographic projection of the first opening k1 on the base substrate 21. The structure in which the orthographic projection of the second opening k2 on the base substrate 21 and the orthographic projection of the first opening k1 on the base substrate have an overlapping area can be as follows: Figure 5 As shown, it is a structural schematic diagram of another fingerprint collection device shown in an embodiment of the present application. Figure 5 It can be seen from the figure that the orthographic projection of the second opening k2 on the base substrate 21 and the orthographic projection of the first opening k1 on the base substrate have an overlapping area.

[0065] By setting different relative positions between the second opening and the first opening, the amount of light energy that the photoelectric conversion unit can receive per unit time can be adjusted. For example, the smaller the overlapping area between the second opening and the first opening (the overlapping area between the second opening and the first opening described in the embodiment of the present application refers to the overlapping area between the orthographic projection of the second opening on the substrate and the orthographic projection of the first opening on the substrate), the smaller the light energy that the photoelectric conversion unit can receive per unit time. Conversely, the larger the overlapping area between the second opening and the first opening, the larger the light energy that the photoelectric conversion unit can receive per unit time. On this basis, if the maximum threshold of the light energy that the photoelectric conversion unit can receive per unit time is large, the area of ​​the overlapping area between the second opening and the first opening can be correspondingly increased. If the maximum threshold of the light energy that the photoelectric conversion unit can receive per unit time is small, the area of ​​the overlapping area between the second opening and the first opening can be correspondingly reduced.

[0066] It should be noted that, in the embodiment of the present application, when the orthographic projection of the second opening k2 on the base substrate 21 is connected to the orthographic projection of the first opening k1 on the base substrate 21, the first shading pattern 23 and the second shading pattern 24 are not in a close structural relationship (that is, there is a preset distance between the first shading pattern 23 and the second shading pattern 24 in a direction perpendicular to the base substrate), so that part of the light can be irradiated onto the photoelectric conversion unit.

[0067] Optionally, the shapes of the first opening on the first shielding block and the second opening on the second shielding block may be congruent, for example, the first opening and the second opening are both square, or the first opening and the second opening are both circular.

[0068] In addition, the shapes of the first opening on the first blocking block and the second opening on the second blocking block may also be different. For example, the shapes of the first opening and the second opening may include at least one of various shapes such as rectangle, circle, prism, pentagon, hexagon, etc., and the embodiments of the present application are not limited to this.

[0069] In the embodiment of the present application, the first light shielding pattern 23 and the second light shielding pattern 24 can be made of a composite metal layer composed of a molybdenum (Mo) layer, an aluminum (Al) layer, and a molybdenum layer (for example, the composite metal layer can be processed by a patterning process to form the first light shielding pattern 23 and the second light shielding pattern 24), and the composite metal layer composed of the molybdenum layer, the aluminum layer, and the molybdenum layer can have a good light shielding effect. Of course, the first light shielding pattern 23 and the second light shielding pattern 24 can also be made of an aluminum layer, or the first light shielding pattern 23 and the second light shielding pattern 24 can be made of a molybdenum layer, which is not limited in the embodiment of the present application.

[0070] It should be noted that the patterning process involved in the embodiments of the present application may include processes such as coating photoresist, exposing, developing, etching and stripping photoresist.

[0071] Please refer to Figure 6 , which is a schematic diagram of a top view structure of a fingerprint collection device provided in an embodiment of the present application (the schematic diagram of the top view structure may be a diagram viewed from above the substrate and in the direction of the substrate). For ease of explanation, the schematic diagram of the top view structure only shows a partial structure of a photoelectric conversion unit, but does not limit this.

[0072] Optionally, the fingerprint collection device 20 further includes a plurality of signal lines s1, a plurality of gate lines s2 and a plurality of thin film transistors 28 on the substrate. The plurality of signal lines s1 and the plurality of gate lines s2 may be crisscrossed to divide a plurality of pixel areas on the substrate 21, and each pixel area may have a photoelectric conversion unit.

[0073] The electrodes in the thin film transistor 28 may be connected to the signal line s1 and the gate line s2 . The thin film transistor 28 may be used to control the photoelectric conversion unit 221 and obtain an electrical signal from the photoelectric conversion unit 221 .

[0074] The first light shielding block 231 has a first opening k1 , and the photoelectric conversion unit 221 below the first light shielding block 231 is exposed at the first opening k1 , so that light can also irradiate the photoelectric conversion unit 221 through the first opening k1 .

[0075] The size of the first photoelectric conversion unit 221 below the first light shielding block 231 may be slightly smaller than the first light shielding block 231. For example, Figure 7 As shown, it is Figure 6 The fingerprint collection device shown is a schematic diagram of the structure when the first light shielding block 231 is not shown. It can be seen that the photoelectric conversion unit 221 occupies a larger area in the pixel area, so that the size of the photoelectric conversion unit 221 is larger, the threshold of the energy of the light that can be received per unit time is larger, and the ability to resist strong light is improved.

[0076] Please refer to Figure 8 , Figure 8 for Figure 6 A schematic cross-sectional view of the fingerprint collection device at D1-D1 is shown.

[0077] Optionally, the fingerprint collection device 20 further includes a plurality of thin film transistors located on the substrate, the thin film transistors include a first electrode e1, a second electrode e2, and a third electrode e3 for controlling the on and off between the first electrode e1 and the second electrode e2, and the first photoelectric conversion unit 221 is connected to the second electrode e2. Among them, one electrode of the first electrode e1 and the second electrode e2 is a source electrode, and the other electrode is a drain electrode, one electrode can be connected to the signal line s1 of the fingerprint collection device, and the other electrode is connected to the first photoelectric conversion unit 221. The third electrode e3 is a gate electrode, and the third electrode e3 can be connected to the gate line of the fingerprint collection device. In addition, the thin film transistor also includes an active layer a, the first electrode e1 and the second electrode e2 are both overlapped on the active layer a, and the third electrode e3 can form a path in the active layer a by applying power to connect the first electrode e1 and the second electrode e2.

[0078] Please refer to Figure 5 , Figure 7 and Fig.10 The fingerprint collection device 20 also includes a gate insulating layer 291 located between the active layer a and the gate e3 and a first insulating layer 292 located on the gate insulating layer 291. The first insulating layer 292 has an opening, and an electrode (such as the positive electrode) of the photoelectric conversion unit 22 is electrically connected to the second electrode e2 of the thin film transistor through the opening.

[0079] The fingerprint collection device 20 further includes a transparent flat layer 293 formed on the photoelectric conversion unit 22, and the flat layer 293 is formed with an opening at the photoelectric conversion unit 22 to expose the upper part of the photoelectric conversion unit 22. The flat layer 293 can be used to flatten each partial area on the base substrate 21. The material of the flat layer 293 can include resin.

[0080] Optionally, the fingerprint collection device further includes a common electrode 294, which is located on the base substrate 21 provided with a plurality of photoelectric conversion units 22 and is electrically connected to the plurality of photoelectric conversion units 22. The common electrode 294 can serve as a common cathode of the plurality of photoelectric conversion units 22 and is electrically connected to the cathode of each photoelectric conversion unit 22. The material of the common electrode 294 can include indium tin oxide.

[0081] Please refer to Fig. 9 , which is a schematic diagram of a top view structure of a fingerprint collection device provided in an embodiment of the present application (the schematic diagram of the top view structure may be a diagram viewed from above the substrate and in the direction of the substrate). For ease of explanation, the schematic diagram of the top view structure only shows a partial structure of a photoelectric conversion unit, but does not limit this.

[0082] exist Fig. 9 In the figure, the dotted box is the first opening k1 in the first light shielding block below the second light shielding block 241, and the second opening k2 on the second light shielding block 241 is adjacent to the first opening k1. Fig. 9 The figure shows the situation where the first opening k1 of the first shading block and the second opening k2 on the second shading block 241 are completely offset, but the first opening k1 and the second opening k2 on the second shading block 241 may also have overlapping areas, which is not limited in the embodiment of the present application.

[0083] like Fig.10 As shown, it is Fig. 9 A schematic cross-sectional view of the fingerprint collection device at D2-D2 is shown.

[0084] It can be seen that the fingerprint collection device further includes a transparent spacer layer 25, which is located between the first light shielding pattern 23 and the second light shielding pattern 24. The transparent spacer layer 25 can adjust the distance between the first light shielding pattern 23 and the second light shielding pattern 24, thereby adjusting the energy of light irradiated onto the photoelectric conversion unit through the second opening and the first opening per unit time. The material of the transparent spacer layer 25 may include resin (such as optical resin), and the resin can form a film layer with high light transmittance.

[0085] for Fig.10 The fingerprint collection device shown may also include other structures, for example, please refer to Fig.11 , which is a structural schematic diagram of another fingerprint collection device provided in an embodiment of the present application.

[0086] Optionally, the fingerprint collection device 20 further includes: a transparent insulating layer 26 located on the base substrate 21 provided with the second shading pattern 24, and a transparent conductive layer 27 located on the base substrate 21 provided with the transparent insulating layer 26, and the transparent conductive layer 27 is electrically connected to the ground point (GND). The transparent conductive layer 27 connected to the ground point can be used as an electrostatic discharge (ESD) of the fingerprint collection device to enhance the electrostatic protection capability of the fingerprint collection device. The material of the transparent conductive layer 27 may include a transparent metal material, such as indium tin oxide (ITO).

[0087] Optionally, the material of the first light shielding pattern 24 includes metal, and the first light shielding pattern 24 is located on the common electrode 294 and is electrically connected to the common electrode 294. In this case, the second light shielding pattern 24 and the common electrode 294 can transmit cathode signals together.

[0088] Optionally, the fingerprint collection device further includes a backlight plate 295, which is located on a side of the substrate 21 away from the plurality of photoelectric conversion units. The backlight plate 295 may include a light guide plate and a light emitting unit located on one side of the light guide plate to provide a surface light source.

[0089] Please refer to Figure 5 , Figure 7 and Fig.10 The second pole e2 is made of a light-shielding conductive material, the photoelectric conversion unit 22 is located on the second pole e2, and the orthographic projection of the photoelectric conversion unit 22 on the backlight plate 295 is located in the orthographic projection of the second pole e2 on the backlight plate 295. In this structure, the second pole e2 can be used as a shielding structure to prevent the light emitted by the backlight plate 295 from directly irradiating the photoelectric conversion unit 22. The second pole e2 can be formed by a composite film layer of a molybdenum layer and an aluminum layer.

[0090] Optionally, the fingerprint collection device further includes a light shielding sheet 296 disposed on the same layer as the third pole e3, and the orthographic projection of the photoelectric conversion unit 22 on the backlight plate 295 is located in the orthographic projection of the light shielding sheet 296 on the backlight plate 295. The light shielding sheet 296 can cooperate with the second pole e2 to block the light emitted by the backlight plate 295 from directly irradiating the photoelectric conversion unit 22. In addition, since the light shielding sheet 296 and the third pole e3 are structures on the same layer, the light shielding sheet 296 and the third pole e3 can be formed by the same metal layer through a single patterning process, which not only saves the manufacturing process, but also simplifies the structure of the fingerprint collection device.

[0091] The above drawings show that each photoelectric conversion unit has one opening on the first light shielding block and one opening on the second light shielding block. However, each first light shielding block and second light shielding block may have more openings.

[0092] Optionally, the first light shielding block further has at least one third opening, and the orthographic projection of the at least one third opening on the substrate is located in the orthographic projection of the first photoelectric conversion unit on the substrate.

[0093] Optionally, the second shading block also has at least one fourth opening corresponding one-to-one to at least one third opening, and the orthographic projection of the fourth opening on the substrate substrate is connected to the orthographic projection of the corresponding third opening on the substrate substrate, or the orthographic projection of the fourth opening on the substrate substrate and the orthographic projection of the corresponding third opening on the substrate substrate have an overlapping area.

[0094] In this structure, the energy of light incident into the photoelectric conversion unit per unit time can be adjusted by adjusting the number of openings on the first light shielding block and the second light shielding block.

[0095] In the fingerprint acquisition device provided in the embodiment of the present application, the substrate and the structure on one side of the substrate close to the photoelectric conversion unit can constitute a fingerprint sensor, and the backlight plate is used to provide light source to the fingerprint sensor. The fingerprint acquisition device may also include a control component (the control component may include a control integrated circuit (IC)), which may be electrically connected to multiple thin film transistors for controlling the multiple thin film transistors.

[0096] Alternatively, if Fig.12 As shown, it is a schematic diagram of the structure of another fingerprint collection device provided in an embodiment of the present application, and the fingerprint collection device also includes a control circuit board 298, and the control circuit board 298 is located on the side of the backlight plate 295 away from the substrate 21, wherein the sensor SS may include the substrate substrate in the fingerprint collection device provided in the above embodiment and the structure of the side of the substrate substrate close to the photoelectric conversion unit. The control circuit board 298 can be electrically connected to the backlight plate 295 and the control component in the sensor SS to control the sensor SS and the backlight plate 295. Exemplarily, the control circuit board 298 may include a field programmable gate array (Field Programmable Gate Array, FPGA).

[0097] Optionally, the fingerprint collection device further includes a housing 299, and the control circuit board 298, the backlight panel 295 and the sensor SS can all be located in the housing 299. The housing 299 can protect various structures inside it, thereby increasing the life of the fingerprint collection device.

[0098] In summary, the embodiment of the present application provides a fingerprint acquisition device, which includes a photoelectric conversion unit and a light shielding layer located on the photoelectric conversion unit, and the light shielding layer has an opening, through which the light irradiated on the photoelectric conversion unit can be greatly reduced, and the energy of the light irradiated on the photoelectric conversion unit is prevented from exceeding the threshold acceptable to the photoelectric conversion unit, thereby improving the ability of the fingerprint acquisition device to resist strong light. Since the fingerprint acquisition device does not need to resist strong light through a prism structure, the overall structure is smaller and thinner. The problem of the fingerprint acquisition device being large in overall size and thick in thickness in the related art is solved, and the effect of reducing the overall thickness of the fingerprint acquisition device is achieved.

[0099] The embodiment of the present application provides a fingerprint collection device including a photoelectric conversion unit and a light-shielding layer with an opening. The photoelectric conversion unit is shielded over a large area by the light-shielding layer so that light can only be irradiated onto the photoelectric conversion unit through the opening. This can greatly reduce the energy of light received by the photoelectric conversion unit and reduce the possibility of external strong light irradiating onto the photoelectric conversion unit and causing the photoelectric conversion unit to malfunction. The fingerprint collection device provides a new way to resist strong light, and because this method does not require the provision of a prism and the optical path of the prism, the structure of the entire fingerprint collection device is relatively simple and the size is relatively small, making it easy to be applied to various thin and light devices, thereby greatly improving the scope of application of the fingerprint collection device.

[0100] In an exemplary embodiment, Fig.13 As shown, it is Figure 4 A schematic diagram of an application structure of a fingerprint collection device is shown in FIG. Fig.13 In the figure, the first opening k1 and the second opening k2 are rectangular openings of equal shape, and the side length is d. In the direction perpendicular to the base substrate 21, the distance between the first blocking block 231 and the second blocking block 241 is h. Among the external light, the maximum incident angle of the light that can pass through the first opening k1 and the second opening k2 and hit the first photoelectric conversion unit 221 is α.

[0101] Based on some current manufacturing processes, the pixel pitch of the fingerprint acquisition device (the pixel pitch may refer to the distance between the centers of two adjacent first photoelectric conversion units) is 50.8 microns. Considering the line width and line spacing of the gate line and the signal line, the minimum distance between adjacent first photoelectric conversion units may be greater than or equal to 17 microns. Based on the fact that multiple photoelectric conversion units can distinguish the light reflected by the estimated valley and ridge of the finger, and the external light will not have a significant impact on the photoelectric conversion unit, the range of h is 3 microns-10 microns (in Fig.11In the fingerprint collection device shown, h can be the thickness of the transparent spacer layer 25). When h is 10 microns, if the orthographic projection of the photoelectric conversion unit on the substrate is a rectangle, the length and width of the photoelectric conversion unit (the length and width are the dimensions of the photoelectric conversion unit in the direction parallel to the substrate) can range from 3.6 microns to 8.3 microns. The area of ​​the orthographic projection of the first opening k1 on the first shielding block on the substrate can account for 3% of the area of ​​the orthographic projection of the photoelectric conversion unit on the substrate, that is, the first shielding block can produce a 97% shielding effect, which can meet the requirements of resisting strong light. Exemplarily, when the orthographic projection of the photoelectric conversion unit on the substrate is a square with a side length of 32 microns, the area is 1024 square microns, the area of ​​the first shading block is 994 square microns, the first opening is a square opening with a side length of 5.5 microns*5.5 microns, and when h is 3 microns, the angle α is approximately 74.5°.

[0102] In addition, an embodiment of the present application also provides an electronic device, which may include any fingerprint collection device provided in the above embodiments.

[0103] Since the volume of the fingerprint collection device provided in the above embodiment is relatively small, it may be less than one tenth of the volume of the fingerprint collection device including a prism, and thus the fingerprint collection device can be conveniently arranged in an electronic device. For example, when the electronic device is a display device, the fingerprint collection device can be arranged around the display screen of the display device, or can be arranged at the edge of the display device. The display device may include various devices with display functions such as mobile phones, tablet computers, notebook computers, and desktop computers.

[0104] Alternatively, the electronic device may be other devices that need to provide fingerprint collection functions, such as those used in security products, electronic time clocks, smart safes, and smart door locks.

[0105] In this application, the term "at least one of A and B" is only a description of the association relationship of the associated objects, indicating that there can be three kinds of relationships. For example, at least one of A and B can be represented by: A exists alone, A and B exist at the same time, and B exists alone. Similarly, "at least one of A, B, and C" means that there can be seven kinds of relationships, which can be represented by: A exists alone, B exists alone, C exists alone, A and B exist at the same time, A and C exist at the same time, C and B exist at the same time, and A, B, and C exist at the same time. Similarly, "at least one of A, B, C, and D" means that there can be fifteen kinds of relationships, which can be represented by: A exists alone, B exists alone, C exists alone, D exists alone, A and B exist at the same time, A and C exist at the same time, A and D exist at the same time, C and B exist at the same time, D and B exist at the same time, C and D exist at the same time, A, B, and C exist at the same time, A, B, and D exist at the same time, A, C, and D exist at the same time, B, C, and D exist at the same time, and A, B, C, and D exist at the same time.

[0106] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It is also understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it is understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it may be the only layer between the two layers or two elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.

[0107] In the present application, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0108] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A fingerprint collection device, characterized in that: The fingerprint collection device comprises: substrate substrate; and, a plurality of photoelectric conversion units located on the substrate; and a first light-shielding pattern located on a base substrate provided with the plurality of photoelectric conversion units, the first light-shielding pattern comprising at least one first light-shielding block corresponding to at least one first photoelectric conversion unit among the plurality of photoelectric conversion units, the first light-shielding block having a first opening, an orthographic projection of the first opening on the first light-shielding block on the base substrate being located in an orthographic projection of the first photoelectric conversion unit corresponding to the first light-shielding block on the base substrate; The fingerprint collection device also includes: a second light-shielding pattern located on the base substrate provided with the first light-shielding pattern, the second light-shielding pattern comprising at least one second light-shielding block corresponding to the at least one first light-shielding block, the second light-shielding block having a second opening, an orthographic projection of the second opening on the second light-shielding block on the base substrate being connected to an orthographic projection of the first opening of the first light-shielding block corresponding to the second light-shielding block on the base substrate, or an orthographic projection of the second opening on the second light-shielding block on the base substrate and an orthographic projection of the first opening of the first light-shielding block corresponding to the second light-shielding block on the base substrate having an overlapping area; The fingerprint collection device further includes a plurality of thin film transistors located on the substrate, the thin film transistors including a first electrode, a second electrode and a third electrode for controlling the on-off between the first electrode and the second electrode, and the photoelectric conversion unit is electrically connected to the second electrode; The fingerprint collection device further includes a backlight plate, which is located on a side of the substrate away from the plurality of photoelectric conversion units; The second pole is made of a light-shielding conductive material, the photoelectric conversion unit is located on the second pole, and the orthographic projection of the photoelectric conversion unit on the backlight panel is located in the orthographic projection of the second pole on the backlight panel.

2. The fingerprint collection device according to claim 1, characterized in that: The fingerprint collection device further includes a transparent spacer layer, and the transparent spacer layer is located between the first light-shielding pattern and the second light-shielding pattern.

3. The fingerprint collection device according to claim 2, characterized in that: The first light shielding block further has at least one third opening, and the orthographic projection of the at least one third opening on the base substrate is located in the orthographic projection of the first photoelectric conversion unit on the base substrate.

4. The fingerprint collection device according to claim 3, characterized in that: The second light-shielding block also has at least one fourth opening corresponding one-to-one to the at least one third opening, and the orthographic projection of the fourth opening on the substrate is connected to the orthographic projection of the third opening corresponding to the fourth opening on the substrate, or the orthographic projection of the fourth opening on the substrate and the orthographic projection of the third opening corresponding to the fourth opening on the substrate have an overlapping area.

5. The fingerprint collection device according to claim 2, characterized in that: Each of the plurality of photoelectric conversion units is the first photoelectric conversion unit.

6. The fingerprint collection device according to claim 1, characterized in that: The fingerprint collection device also includes: a transparent insulating layer located on the base substrate provided with the second light-shielding pattern; And, a transparent conductive layer is located on the base substrate provided with the transparent insulating layer, and the transparent conductive layer is electrically connected to the ground point.

7. The fingerprint collection device according to claim 2, characterized in that: The fingerprint collection device further includes a common electrode, which is located on the base substrate on which the plurality of photoelectric conversion units are disposed and is electrically connected to the plurality of photoelectric conversion units.

8. The fingerprint collection device according to claim 7, characterized in that: The material of the first light shielding pattern includes metal. The first light shielding pattern is located on the common electrode and is electrically connected to the common electrode.

9. The fingerprint collection device according to claim 2, characterized in that: The fingerprint collection device further comprises a light shielding sheet arranged at the same layer as the third electrode, and the orthographic projection of the photoelectric conversion unit on the backlight plate is located in the orthographic projection of the light shielding sheet on the backlight plate.

10. The fingerprint collection device according to any one of claims 2 to 9, characterized in that: The first light-shielding pattern and the second light-shielding pattern are made of a molybdenum layer, an aluminum layer and a composite metal layer consisting of a molybdenum layer, or the first light-shielding pattern and the second light-shielding pattern are made of an aluminum layer, or the first light-shielding pattern and the second light-shielding pattern are made of a molybdenum layer.

11. An electronic device, characterized in that: The electronic device comprises the fingerprint collection device described in any one of claims 1-10.

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