Fingerprint recognition device and electronic device

Abstract

The utility model discloses a kind of fingerprint identification device and electronic equipment, the fingerprint identification device includes cover plate, fingerprint imaging module and projection module;The cover plate is equipped with fingerprint identification area;The fingerprint imaging module is arranged below the cover plate, the fingerprint imaging module is oppositely arranged with the fingerprint identification area;The projection module is arranged below cover plate, for projecting light to the fingerprint identification area;The upper surface or lower surface of the fingerprint identification area is equipped with indicating structure, the indicating structure is based on the light projected by the projection module, indicating the fingerprint identification area.Under the action of light, when needing to collect fingerprint, projection module projects light to fingerprint identification area, so that indicating structure on fingerprint identification area indicates fingerprint identification area, so that human eye can clearly watch fingerprint identification area, facilitate user to carry out pressing operation in fingerprint identification area.

Description

Technical Field

[0001] This utility model relates to the field of fingerprint recognition technology, and in particular to a fingerprint recognition device and electronic device. Background Technology

[0002] A fingerprint recognition device is used to implement fingerprint recognition functionality. A fingerprint recognition device generally includes a cover plate and a fingerprint imaging module. The cover plate has a fingerprint recognition area, and the fingerprint imaging module is located below the cover plate, opposite to the fingerprint recognition area. When light shines on the fingerprint recognition area, it forms reflected light that is transmitted to the fingerprint imaging module for fingerprint imaging. To facilitate fingerprint operation, an indicator design is generally required to indicate the fingerprint recognition area.

[0003] In fingerprint recognition devices, silkscreening patterns on the cover plate is a common way to indicate the fingerprint recognition area. However, in scenarios such as optical fingerprint recognition devices where the light transmittance of the cover plate is extremely important, the silkscreened pattern can affect the performance of the cover plate and thus the imaging quality of the fingerprint imaging module. Utility Model Content

[0004] This utility model provides a fingerprint recognition device and electronic device that can both ensure the imaging quality of the fingerprint imaging module and effectively indicate the fingerprint recognition area to facilitate the user's fingerprint pressing operation.

[0005] A fingerprint recognition device includes a cover plate, a fingerprint imaging module, and a projection module;

[0006] The cover plate is equipped with a fingerprint recognition area;

[0007] The fingerprint imaging module is disposed below the cover plate, and the fingerprint imaging module is disposed opposite to the fingerprint recognition area;

[0008] The projection module is located below the cover plate and is used to project light onto the fingerprint recognition area;

[0009] The upper or lower surface of the fingerprint recognition area is provided with an indicator structure, which indicates the fingerprint recognition area based on the light projected by the projection module.

[0010] Preferably, the indicating structure includes an atomizing structure;

[0011] The projection module includes a projection light source, a pattern display module, and a projection lens;

[0012] The pattern display module is disposed between the projection light source and the projection lens, and is used to convert the light emitted by the projection light source into patterned light.

[0013] The projection lens is positioned toward the fingerprint recognition area to project the patterned light onto the atomizing structure. The atomizing structure diffuses the patterned light so that the fingerprint recognition area displays the pattern corresponding to the pattern display module.

[0014] Preferably, the indicating structure includes an atomizing structure;

[0015] The projection module includes a projection light source, a pattern display module, a projection lens, and a beam splitter.

[0016] The pattern display module is disposed between the projection light source and the projection lens, and is used to convert the light emitted by the projection light source into patterned light.

[0017] The projection lens and the fingerprint recognition area are located in the incident area and the exit area of ​​the beam splitter, respectively. The beam splitter is used to project the patterned light emitted from the projection lens onto the atomizing structure. The atomizing structure diffuses the patterned light so that the fingerprint recognition area displays the pattern corresponding to the pattern display module.

[0018] Preferably, the projection module further includes a microlens array, which is disposed between the projection light source and the pattern display module.

[0019] Preferably, the pattern display module is a liquid crystal panel, a digital micromirror device, or a perforated light-shielding sheet.

[0020] Preferably, the atomization degree of the atomizing structure is less than 45%.

[0021] Preferably, the indicating structure includes a photochromic coating;

[0022] The projection module includes a projection light source, which is positioned toward the photochromic coating. The light emitted by the projection light source is projected onto the photochromic coating to cause the photochromic coating to change color.

[0023] Preferably, the indicating structure includes a photochromic coating;

[0024] The projection module includes a projection light source and a beam splitter;

[0025] The projection light source and the photochromic coating are located on the incident area and the exit area of ​​the beam splitter, respectively. The light emitted by the projection light source is projected onto the photochromic coating through the beam splitter to cause the photochromic coating to change color.

[0026] Preferably, the projection light source includes multiple light sources arranged in a ring with intervals between them.

[0027] Preferably, the beam-splitting element is a semi-reflective lens or a beam-splitting prism.

[0028] An electronic device includes the fingerprint recognition device described above.

[0029] The fingerprint recognition device and electronic device provided in this embodiment of the utility model have an indicator structure on the upper or lower surface of the fingerprint recognition area of ​​the cover plate. A projection module and a fingerprint imaging module are located below the cover plate. When fingerprint collection is required, the projection module projects light onto the fingerprint recognition area, causing the indicator structure on the fingerprint recognition area to indicate the fingerprint recognition area under the light, making the fingerprint recognition area clearly visible to the human eye and facilitating the user's pressing operation. This allows the fingerprint imaging module to quickly and effectively collect fingerprint data. The indicator structure on the upper or lower surface of the fingerprint recognition area, using a single indicator structure to indicate the fingerprint recognition area under the projected light, avoids the ghosting phenomenon that occurs with double-sided installations, thus ensuring the imaging quality of the fingerprint data collected by the fingerprint imaging module. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a first schematic diagram of a fingerprint recognition device in one embodiment of the present invention;

[0032] Figure 2 This is a second schematic diagram of a fingerprint recognition device in one embodiment of the present invention;

[0033] Figure 3 This is a third schematic diagram of a fingerprint recognition device in one embodiment of the present invention;

[0034] Figure 4 This is a fourth schematic diagram of a fingerprint recognition device in one embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of a projection light source in one embodiment of the present invention.

[0036] In the diagram: 1. Cover plate; 11. Fingerprint recognition area; 12. Photochromic coating; 2. Fingerprint imaging module; 3. Projection module; 31. Projection light source; 32. Pattern display module; 33. Projection lens; 34. Beam splitter; 35. Microlens array. Detailed Implementation

[0037] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0038] This utility model provides a fingerprint recognition device that can be installed on a mobile phone, tablet, or other electronic device. Figures 1-4 As shown, the fingerprint recognition device includes a cover plate 1, a fingerprint imaging module 2, and a projection module 3; the cover plate 1 is provided with a fingerprint recognition area 11; the fingerprint imaging module 2 is disposed below the cover plate 1, and the fingerprint imaging module 2 is disposed opposite to the fingerprint recognition area 11; the projection module 3 is disposed below the cover plate 1 and is used to project light onto the fingerprint recognition area 11; the upper or lower surface of the fingerprint recognition area 11 is provided with an indicator structure, which indicates the fingerprint recognition area 11 based on the light projected by the projection module 3.

[0039] The cover plate 1 provides a touch interface for finger pressing. The cover plate 1 is made of a high-transmittance material, which can be, but is not limited to, glass, acrylic, and sapphire. The fingerprint recognition area 11 is the area for finger pressing to collect fingerprints. In this example, the cover plate 1 has a fingerprint recognition area 11, which is a light-transmitting area that can transmit light to cooperate with the fingerprint imaging module 2 to achieve fingerprint imaging; the area outside the fingerprint recognition area 11 is an opaque area, which can be coated with ink.

[0040] The fingerprint imaging module 2 is located below the cover plate 1, opposite to the fingerprint recognition area 11. It receives the reflected light generated by the imaging light source illuminating the fingerprint recognition area 11 and performs fingerprint recognition based on the reflected light. The imaging light source here is a light source that works in conjunction with the fingerprint imaging module 2. Specifically, when a finger is pressed on the fingerprint recognition area 11, the light emitted by the imaging light source passes through the cover plate 1 and illuminates the finger. The ridge features of the fingerprint reflect the light and transmit it to the fingerprint imaging module 2. The fingerprint imaging module 2 completes fingerprint imaging based on the collected data.

[0041] The projection module 3 is a module capable of projecting light. The projection module 3 is located below the cover plate 1, specifically outside the fingerprint imaging module 2, and is capable of projecting light onto the fingerprint recognition area 11.

[0042] The indicator structure is a structure that can indicate the fingerprint recognition area 11 under the action of light.

[0043] In this embodiment, an indicator structure is provided on the upper or lower surface of the fingerprint recognition area 11 of the cover plate 1. A projection module 3 and a fingerprint imaging module 2 are provided below the cover plate 1. When fingerprints need to be collected, the projection module 3 projects light onto the fingerprint recognition area 11, so that the indicator structure on the fingerprint recognition area 11 indicates the fingerprint recognition area 11 under the action of light, making the fingerprint recognition area 11 clearly visible to the human eye. This facilitates the user's pressing operation on the fingerprint recognition area 11, allowing the fingerprint imaging module 2 to quickly and effectively collect fingerprint data. By providing an indicator structure on the upper or lower surface of the fingerprint recognition area 11 and using a single indicator structure to indicate the fingerprint recognition area 11 under the action of projected light, the ghosting phenomenon that occurs with double-sided settings is avoided, thus ensuring the imaging quality of the fingerprint data collected by the fingerprint imaging module 2.

[0044] In one embodiment, such as Figure 1 As shown, the indicating structure includes a fogging structure; the projection module 3 includes a projection light source 31, a pattern display module 32, and a projection lens 33; the pattern display module 32 is disposed between the projection light source 31 and the projection lens 33, and is used to convert the light emitted by the projection light source 31 into patterned light; the projection lens 33 is disposed towards the fingerprint recognition area 11, and is used to project the patterned light onto the fogging structure, and the fogging structure diffuses the patterned light so that the fingerprint recognition area 11 displays the pattern corresponding to the pattern display module 32.

[0045] The atomizing structure is a structure with atomization degree, which can be formed into atomized particles through coating, electrochemical or other processes. The atomizing structure can diffusely reflect the light projected onto the fingerprint recognition area 11, so that the light projected onto the fingerprint recognition area 11 can be observed by the human eye, thereby achieving the purpose of indicating the fingerprint recognition area 11.

[0046] In this example, the indicator structure on the upper or lower surface of the fingerprint recognition area 11 can be a fogging structure. That is, the fogging structure is located on the upper or lower surface of the fingerprint recognition area 11, making one side of the fingerprint recognition area 11 smooth and the other side rough. This allows the fingerprint recognition area 11 to meet the fingerprint imaging requirements of the fingerprint imaging module 2, ensuring the imaging quality of the fingerprint imaging module 2. It can also cooperate with the projection module 3 to diffusely reflect light, making the fingerprint recognition area 11 clearly visible. The fogging structure is only located on one side of the fingerprint recognition area 11, rather than both sides, avoiding diffuse reflection from both sides and thus preventing it from affecting the imaging quality of the fingerprint imaging module 2.

[0047] The projection light source 31 is the light source in the projection module 3 that emits light. As an example, the projection light source 31 can be a monochromatic light source or a multi-color light source, which can be set according to the actual situation. The pattern display module 32 refers to the module that can perform light conversion to convert the light emitted by the projection light source 31 into patterned light. The projection lens 33 is a lens used to project light onto the fingerprint recognition area 11. Specifically, a 1P lens, a 2P lens, or a 3P lens can be selected according to the complexity of the projected pattern and the projection area.

[0048] As an example, the projection module 3 includes a projection light source 31, a pattern display module 32, and a projection lens 33. The pattern display module 32 is disposed between the projection light source 31 and the projection lens 33. The light emitted by the projection light source 31 forms patterned light after passing through the pattern display module 32. The patterned light passes through the projection lens 33 and is projected onto the fingerprint recognition area 11. The atomization structure disposed on the upper or lower surface of the fingerprint recognition area 11 diffuses the patterned light, so that the fingerprint recognition area 11 displays the pattern corresponding to the pattern display module 32, clearly indicating the fingerprint recognition area 11, enabling the user to quickly and accurately press the fingerprint recognition area 11, and enabling the fingerprint imaging module 2 to quickly and effectively collect fingerprint data.

[0049] In one embodiment, such as Figure 2 As shown, the indicating structure includes a fogging structure; the projection module 3 includes a projection light source 31, a pattern display module 32, a projection lens 33, and a beam splitter 34; the pattern display module 32 is disposed between the projection light source 31 and the projection lens 33, and is used to convert the light emitted by the projection light source 31 into patterned light; the projection lens 33 and the fingerprint recognition area 11 are located in the incident area and the exit area of ​​the beam splitter 34, respectively. The beam splitter 34 is used to project the patterned light emitted by the projection lens 33 onto the fogging structure. The fogging structure diffuses the patterned light so that the fingerprint recognition area 11 displays the pattern corresponding to the pattern display module 32.

[0050] In this context, beam splitter 34 refers to an optical element that splits a beam of light into multiple beams. The incident region of beam splitter 34 refers to the region where light enters, and the exit region of beam splitter 34 refers to the region where light exits.

[0051] As an example, the projection module 3 includes a projection light source 31, a pattern display module 32, a projection lens 33, and a beam splitter 34. The beam splitter 34 is inclined relative to the cover plate 1, with an acute angle between them. The projection lens 33 and the fingerprint recognition area 11 are located in the incident area and the exit area of ​​the beam splitter 34, respectively. In one example, the projection light source 31, the pattern display module 32, and the projection lens 33 are arranged sequentially. The projection lens 33 outputs horizontally patterned light to the beam splitter 34, which is set at 45°. After beam splitting, the beam splitter 34 can project a portion of the light onto the fingerprint recognition area 11.

[0052] The projection module 3 operates as follows: Light emitted from the projection light source 31 passes through the pattern display module 32, forming patterned light. This patterned light passes through the projection lens 33 and is projected onto the beam splitter 34. The beam splitter 34 projects the patterned light onto the fingerprint recognition area 11. A frosted structure on the upper or lower surface of the fingerprint recognition area 11 diffusely reflects the patterned light, allowing the fingerprint recognition area 11 to display the pattern corresponding to the pattern display module 32, clearly indicating the fingerprint recognition area 11. This enables the user to quickly and accurately press the fingerprint recognition area 11, allowing the fingerprint imaging module 2 to quickly and effectively acquire fingerprint data. In this example, a beam splitter 34 is placed between the projection lens 33 and the fingerprint recognition area 11. The beam splitter 34 projects the patterned light emitted from the projection lens 33 onto the fingerprint recognition area 11, allowing the projection module 3 to effectively avoid the fingerprint imaging module 2 and prevent distortion of the patterned light caused by lateral projection, ensuring a better projection effect.

[0053] In one embodiment, such as Figure 1 and Figure 2 As shown, the projection module 3 also includes a microlens array 35, which is disposed between the projection light source 31 and the pattern display module 32.

[0054] Among them, the microlens array 35 is an optical element composed of a large number of tiny, regularly arranged microlenses.

[0055] As an example, the pattern display module 32 is positioned between the projection light source 31 and the projection lens 33, and the microlens array 35 is positioned between the projection light source 31 and the pattern display module 32. That is, the projection module 3 includes the projection light source 31, the microlens array 35, the pattern display module 32, and the projection lens 33 arranged sequentially. The light emitted by the projection light source 31 forms patterned light after passing through the pattern display module 32. The patterned light is processed by the microlens array 35 to emit more uniform patterned light. The more uniform patterned light can be directly projected onto the fingerprint recognition area 11 through the projection lens 33, or it can be projected onto the fingerprint recognition area 11 through the beam splitter 34, so that the fingerprint recognition area 11 displays a more uniform pattern, thereby illuminating the fingerprint recognition area 11 and enabling the user to quickly and accurately press the fingerprint recognition area 11, so that the fingerprint imaging module 2 can quickly and effectively collect fingerprint data.

[0056] In one embodiment, the pattern display module 32 is a liquid crystal panel, a digital micromirror device, or a perforated light-shielding sheet.

[0057] As an example, the pattern display module 32 can be a liquid crystal display (LCD). The LCD contains multiple liquid crystal molecules. By controlling the arrangement of the multiple liquid crystal molecules and adjusting their corresponding light transmittance, transmissive imaging can be achieved, so that the light emitted by the projection light source 31 can form patterned light rays after passing through the LCD.

[0058] As an example, the pattern display module 32 can be a digital light processing (DLP) device. The DLP has multiple micro mirrors. By mechanically flipping the multiple micro mirrors, the reflection mode of light is controlled to achieve reflective imaging, so that the light emitted by the projection light source 31 can form patterned light after passing through the DLP.

[0059] As an example, the pattern display module 32 can be a perforated light shield with a perforated pattern. When the light emitted by the projection light source 31 shines on the perforated light shield, the light in the area outside the perforated pattern is blocked, and only the light shining on the perforated pattern can enter the projection lens 33 to form patterned light.

[0060] In one embodiment, the atomization degree of the atomizing structure is less than 45%.

[0061] As an example, since setting a fogging structure in the fingerprint recognition area 11 would reduce the image quality of fingerprint imaging, it is necessary to conduct simulation tests on the fogging degree of the fogging structure to determine the fogging degree that balances the fingerprint imaging requirements of the fingerprint imaging module 2 and the diffuse reflection effect. Simulation tests show that the fogging degree of the fogging structure in this solution is less than 45%, meaning the fogging degree of the upper or lower surface of the fingerprint recognition area 11 is less than 45%. This satisfies the fingerprint imaging requirements of the fingerprint imaging module 2, ensuring its imaging quality, while also allowing for diffuse reflection of the light projected onto the fingerprint recognition area 11, clearly indicating the fingerprint recognition area 11. This enables the user to quickly and accurately press the fingerprint recognition area 11, allowing the fingerprint imaging module 2 to quickly and effectively acquire fingerprint data.

[0062] In one embodiment, such as Figure 3 As shown, the indicator structure includes a photochromic coating 12; the projection module 3 includes a projection light source 31, which is positioned toward the photochromic coating 12, and the light emitted by the projection light source 31 is projected onto the photochromic coating 12 to cause the photochromic coating 12 to change color.

[0063] The photochromic coating 12 is a functional coating that undergoes reversible color changes under light. Its color changes with the intensity and wavelength of light, and it returns to its original state when the light disappears. The indicator structure on the upper or lower surface of the fingerprint recognition area 11 can be the photochromic coating 12. When the fingerprint recognition area 11 only has the photochromic coating 12 and no atomizing structure, the photochromic coating 12 can be placed on the upper or lower surface of the fingerprint recognition area 11. When the fingerprint recognition area 11 has both the photochromic coating 12 and the atomizing structure, it is preferable to place both on the same surface of the fingerprint recognition area 11 to avoid ghosting caused by placing them on different surfaces, which would affect the image quality.

[0064] As an example, the upper or lower surface of the fingerprint recognition area 11 has a photochromic coating 12. This photochromic coating 12 may or may not be located on the same surface as the atomizing structure of the fingerprint recognition area 11. The projection module 3 includes a projection light source 31, which is positioned towards the photochromic coating 12, so that the light emitted by the projection light source 31 can be directly projected onto the photochromic coating 12, causing the photochromic coating 12 to change color. This allows the user to quickly and accurately press the fingerprint recognition area 11, enabling the fingerprint imaging module 2 to quickly and effectively acquire fingerprint data.

[0065] In one embodiment, such as Figure 4As shown, the fingerprint recognition area 11 is provided with a photochromic coating 12; the projection module 3 includes a projection light source 31 and a beam splitter 34; the projection light source 31 and the photochromic coating 12 are located on the incident area and the exit area of ​​the beam splitter 34, respectively. The light emitted by the projection light source 31 is projected onto the photochromic coating 12 through the beam splitter 34, so that the photochromic coating 12 changes color.

[0066] As an example, the indicator structure on the upper or lower surface of the fingerprint recognition area 11 can be a photochromic coating 12. The projection light source 31 includes a projection light source 31 and a beam splitter 34, and its operation is as follows: the light emitted by the projection light source 31, which is located in the incident area, is projected onto the beam splitter 34. The beam splitter 34 adjusts the optical path of the light and projects it into the exit area, onto the photochromic coating 12 of the fingerprint recognition area 11, causing the photochromic coating 12 to change color, allowing the user to quickly and accurately press the fingerprint recognition area 11, and enabling the fingerprint imaging module 2 to quickly and effectively collect fingerprint data. The beam splitter 34 is set between the projection light source 31 and the photochromic coating 12 of the fingerprint recognition area 11. The beam splitter 34 projects the light emitted by the projection light source 31 onto the photochromic coating 12 of the fingerprint recognition area 11, so that the projection module 3 can effectively avoid the fingerprint imaging module 2 and can effectively avoid the distortion of patterned light caused by lateral projection, ensuring a better projection effect.

[0067] In one embodiment, such as Figure 5 As shown, the projection light source 31 includes multiple light sources 311, which are arranged in a ring at intervals.

[0068] As an example, the projection light source 31 includes multiple light sources 311. These light sources can be any of the infrared, ultraviolet, and ultraviolet light sources, as long as they can cause the photochromic coating 12 to change color. In this example, the multiple light sources 311 are arranged in a ring with intervals, making the light emitted by the projection light source 31 formed by the multiple light sources 311 more uniform. This results in more uniform light after the photochromic coating 12 changes color, avoiding a situation where the brightness on the side closer to the projection light source 31 is significantly higher than the brightness on the side farther from the projection light source 31 when irradiated from the side.

[0069] In one embodiment, the beam splitter 34 is a half-reflective half-lens or a beam splitter prism.

[0070] As an example, the beam splitter 34 can be a semi-reflective mirror. A semi-reflective mirror is a flat glass or thin film with a special semi-transparent and semi-reflective film (such as a metal film or a dielectric film) coated on its surface. The film layers have different proportions of reflectivity and transmittance for light. When the projection module 3 is working, when the patterned light projected by the projection lens 33 shines on the semi-reflective mirror, part of the light is reflected (changing the direction of propagation), and the other part of the light is directly transmitted (maintaining the original direction of propagation). By using the semi-reflective mirror, the light path of the patterned light projected by the projection lens 33 can be folded by 90°. This avoids the installation space of the fingerprint imaging module 2 and makes the light path between the projection module 3 and the cover plate 1 perpendicular, avoiding the distortion of the pattern caused by lateral projection, thus producing a better projection effect.

[0071] As an example, the beam splitter 34 can be a beam splitter prism, which can be made of two right-angled prisms bonded together. One of the prisms has a semi-transparent, semi-reflective coating (such as a metal film or dielectric film) coated on its inclined surface. When the projection module 3 is working, the patterned light projected by the projection lens 33 shines on the beam splitter prism. It enters from the first right-angled surface of the prism, reaches the semi-transparent, semi-reflective coating on the bonded surface, and part of the light is reflected to the second right-angled surface and exits. The other part of the light passes through the semi-transparent, semi-reflective coating and exits from the third right-angled surface. The beam splitter prism can fold the light path of the patterned light emitted by the projection lens 33 by 90°. While avoiding the installation space of the fingerprint imaging module 2, it can make the light path between the projection module 3 and the cover plate 1 perpendicular, avoiding the distortion of the pattern caused by lateral projection, so as to produce a better projection effect.

[0072] This utility model provides an electronic device including the fingerprint recognition device described in the above embodiment, enabling the electronic device to have fingerprint recognition functionality. This device can be used in automobiles, door locks, security equipment, etc. In the fingerprint recognition device described above, a fogging structure is provided in the fingerprint recognition area 11 of the cover plate 1. A projection module 3 and a fingerprint imaging module 2 are located below the cover plate 1. When fingerprint collection is required, the projection module 3 projects light onto the fingerprint recognition area 11, and the fogging structure diffuses the projected light to indicate the fingerprint recognition area 11, allowing the human eye to clearly see it. Pressing on the fingerprint recognition area 11 enables the fingerprint imaging module 2 to quickly and effectively collect fingerprint data, allowing the electronic device to quickly complete fingerprint recognition and ensuring fingerprint recognition efficiency.

[0073] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A fingerprint recognition device, characterized in that, Includes cover plate, fingerprint imaging module and projection module; The cover plate is equipped with a fingerprint recognition area; The fingerprint imaging module is disposed below the cover plate, and the fingerprint imaging module is disposed opposite to the fingerprint recognition area; The projection module is located below the cover plate and is used to project light onto the fingerprint recognition area; The upper or lower surface of the fingerprint recognition area is provided with an indicator structure, which indicates the fingerprint recognition area based on the light projected by the projection module.

2. The fingerprint recognition device according to claim 1, characterized in that, The indicator structure includes an atomizing structure; The projection module includes a projection light source, a pattern display module, and a projection lens; The pattern display module is disposed between the projection light source and the projection lens, and is used to convert the light emitted by the projection light source into patterned light. The projection lens is positioned toward the fingerprint recognition area to project the patterned light onto the atomizing structure. The atomizing structure diffuses the patterned light so that the fingerprint recognition area displays the pattern corresponding to the pattern display module.

3. The fingerprint recognition device according to claim 1, characterized in that, The indicator structure includes an atomizing structure; The projection module includes a projection light source, a pattern display module, a projection lens, and a beam splitter. The pattern display module is disposed between the projection light source and the projection lens, and is used to convert the light emitted by the projection light source into patterned light. The projection lens and the fingerprint recognition area are located in the incident area and the exit area of ​​the beam splitter, respectively. The beam splitter is used to project the patterned light emitted from the projection lens onto the atomizing structure. The atomizing structure diffuses the patterned light so that the fingerprint recognition area displays the pattern corresponding to the pattern display module.

4. The fingerprint recognition device according to claim 2 or 3, characterized in that, The projection module further includes a microlens array, which is disposed between the projection light source and the pattern display module.

5. The fingerprint recognition device according to claim 2 or 3, characterized in that, The pattern display module is a liquid crystal panel, a digital micromirror device, or a perforated light-shielding sheet.

6. The fingerprint recognition device according to claim 2 or 3, characterized in that, The atomization degree of the atomization structure is less than 45%.

7. The fingerprint recognition device according to claim 1, characterized in that, The indicator structure includes a photochromic coating; The projection module includes a projection light source, which is positioned toward the photochromic coating. The light emitted by the projection light source is projected onto the photochromic coating to cause the photochromic coating to change color.

8. The fingerprint recognition device according to claim 1, characterized in that, The indicator structure includes a photochromic coating; The projection module includes a projection light source and a beam splitter; The projection light source and the photochromic coating are located on the incident area and the exit area of ​​the beam splitter, respectively. The light emitted by the projection light source is projected onto the photochromic coating through the beam splitter to cause the photochromic coating to change color.

9. The fingerprint recognition device according to claim 8, characterized in that, The projection light source includes multiple light sources, which are arranged in a ring at intervals.

10. The fingerprint recognition device according to claim 3 or 8, characterized in that, The beam-splitting element is a semi-reflective lens or a beam-splitting prism.

11. An electronic device, characterized in that, Includes the fingerprint recognition device according to any one of claims 1-10.

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