CN212484380U - Optical detection device and electronic apparatus - Google Patents

Abstract

The application discloses optical detection device includes: an optical detection device comprises a protective layer, a display module, a middle frame and an imaging module. The display module is located below the protective layer. The middle frame is used for protecting the display module. The imaging module is positioned between the display module and the bottom of the middle frame and used for receiving the detection light beams which penetrate through the protective layer and the display module and have the biological characteristic information of the external object and converting the received detection light beams into electric signals, and the electric signals are used for generating the biological characteristic image of the external object. The application also discloses an electronic device.

Description

Optical detection device and electronic apparatus

Technical Field

The present application relates to the field of optoelectronic technologies, and in particular, to an optical detection apparatus and an electronic device having an underscreen biometric feature recognition function.

Background

With the technical progress and the improvement of living standard of people, users demand more functions and fashionable appearance for electronic equipment such as mobile phones, tablet computers and cameras. At present, the development trend of electronic devices such as mobile phones and the like is to have higher screen occupation ratio and have functions of fingerprint detection and the like. In order to realize a full screen or a screen close to the full screen effect, the electronic equipment has a high screen occupation ratio, and a fingerprint detection technology under the screen is developed. For a mobile phone or other electronic equipment using a Liquid Crystal Display (LCD), since the LCD includes a liquid crystal display panel and a backlight module, the internal space of the mobile phone is limited, and an imaging device using a conventional lens to realize optical imaging occupies a large space due to its large size and volume.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present application provides an optical detection apparatus and an electronic device that can solve or improve the problems of the prior art.

One aspect of the present application provides an optical detection apparatus comprising:

a protective layer including a transparent portion capable of transmitting visible light and a non-transparent portion capable of blocking visible light;

the display module is positioned below the protective layer and comprises a liquid crystal display panel and a backlight unit positioned below the liquid crystal display panel, the backlight unit provides visible light to one side where the liquid crystal display panel is positioned, and the visible light can penetrate through the liquid crystal display panel and is emitted to the outside through a transparent part of the protective layer to realize image display;

the middle frame is used for protecting the display module, the display module is positioned between the protective layer and the middle frame, the middle frame comprises a bottom part and a side part, the side part extends upwards from the edge position of the bottom part to be connected with the protective layer, the middle frame and the protective layer form an accommodating space, and the display module is accommodated in the accommodating space;

an imaging module located between the display module and the bottom of the middle frame for receiving a detection beam with biological characteristic information of an external object and transmitted through the protective layer and the display module and converting the received detection beam into an electrical signal, the electrical signal being used for generating a biological characteristic image of the external object, the detection beam being capable of transmitting through the liquid crystal display panel and the backlight unit, the imaging module comprising a lens module and an image sensing chip located below the lens unit, the lens unit comprising a plurality of lenses arranged at intervals for converging the detection beam, the detection beam converged by the lens being received by the image sensing chip and converted into a corresponding electrical signal, wherein the image sensing chip comprises a plurality of effective sensing areas, each of the plurality of effective sensing areas comprises a plurality of pixel units for sensing light, each of the plurality of effective photosensitive areas corresponds to one of the lenses, and the effective photosensitive areas are used for receiving the detection light beams converged by the corresponding lenses.

In some embodiments, the optical detection apparatus further includes a buffer layer located between the display module and the bottom of the middle frame and around the imaging module, and the buffer layer is configured to reduce stray light entering the imaging module.

In some embodiments, the imaging module is fixed on the bottom of the middle frame, and a gap is formed between the imaging module and the display module.

In some embodiments, the upper surface of the protective layer has a detection area from which at least a portion of a detection beam transmitted through the protective layer and the display module can be received by the imaging module, and at least a portion of the detection area is located in a transparent portion of the protective layer.

In some embodiments, the lenses are convex lenses, each of the convex lenses includes a convex surface facing away from the image sensor chip, the detection light beam enters the lenses from the convex surfaces and is converged to exit from the lens module towards one side of the image sensor chip, and the center-to-center distance between two adjacent lenses is greater than or equal to 1 time, 1.5 times, 2 times, 3 times, 4 times, 5 times or 6 times the diameter of the lenses.

In some embodiments, the lens module further includes a dam wall disposed on the interval region of the lens, wherein: the barricade can shelter from the light beam of first predetermined wave band, first predetermined wave band includes the wavelength of detecting beam, perhaps the camera lens unit is still including covering the light shield layer of barricade, the light shield layer can filter first predetermined wave band light beam.

In some embodiments, the dam is taller than the lens.

In some embodiments, the optical detection device further includes a filter layer formed on the image sensing chip and/or above the lens unit; the filter layer is used for the transmission detecting light beam and filters the light beam of the second preset wave band, the second preset wave band does not include detecting light beam's wavelength, works as when the camera lens unit includes the light shield layer, the light shield layer is used for filtering the light beam of the first preset wave band, the first preset wave band with the second is preset the wave band and is totally different or the same or partly the same, works as the first preset wave band with the second is preset the wave band part and is the same, the first preset wave band includes the second is preset the wave band.

In some embodiments, the detection beam comprises near infrared light, and the filter layer is a visible light cut filter for filtering visible light and transmitting near infrared light.

In some embodiments, the lens unit further includes a substrate on which the plurality of lenses and the blocking wall are disposed, the substrate being capable of transmitting the detection beam, and the filter layer being disposed between the substrate and the image sensing chip when the filter layer is formed on the image sensing chip.

In some embodiments, the optical detection device further includes a filter layer, the filter layer is located between the lens module and the image sensing chip, or the filter layer is formed on a side of the lens module facing away from the image sensing chip, the filter layer is configured to transmit near-infrared light and filter out visible light, and the detection light beam includes near-infrared light.

In some embodiments, the optical detection device further includes a light emitting unit located between the display module and the side portion of the middle frame, the light emitting unit is configured to emit a detection light beam, at least a portion of the detection light beam directly passes through the non-transparent portion of the protection layer to reach an external object located above the protection layer, and the external object reflects and/or transmits the detection light beam to form the detection light beam with the biometric information of the external object.

In some embodiments, the light emitting unit includes a light emitting element that emits the detection light beam, and an adjusting element that adjusts at least a portion of the detection light beam emitted by the light emitting element such that the detection light beam adjusted by the adjusting element exits toward the upper side of the transparent portion of the protective layer.

In some embodiments, the upper surface of the protection layer has a detection area, at least a part of the detection beam transmitted from the detection area through the protection layer and the display module can be received by the imaging module, and the adjustment element increases the intensity of the detection beam emitted to the upper part or the vicinity of the upper part of the detection area

In some embodiments, an incident angle of the detection beam entering the protection layer after exiting from the adjustment element is greater than or equal to 30 degrees and less than or equal to 120 degrees.

In some embodiments, the plurality of lenses have one or more arrangements of an equilateral triangular grid or a square grid or an equilateral hexagonal grid.

In some embodiments, the lens module further includes an optical spacer layer located below the lens and the retaining wall, the optical spacer layer is located above the image sensing chip, and the optical spacer layer, the first lens and the retaining wall are an integrated structure.

In some embodiments, the lens and the retaining wall are formed by an imprint process, the optical spacer layer is a residual layer when the first lens and the retaining wall are formed, and the lens, the retaining wall and the optical spacer layer are made of the same material or partially the same material or different materials.

In some embodiments, the backlight unit includes an optical assembly and a bottom case, at least a portion of the bottom case is located below the optical assembly, the bottom case is used for supporting the optical assembly, the optical assembly is used for emitting visible light to the liquid crystal display panel, the bottom case has an opening, and a detection light beam returned by an external object passes through the protective layer, the liquid crystal display panel, the optical assembly and the opening to be received by the imaging module and converted into an electrical signal.

An aspect of the present application provides an electronic device, including the above optical detection apparatus, the electronic device is configured to obtain fingerprint feature information of an external object according to a detection light beam received by the optical detection apparatus.

The beneficial effect of this application lies in, the optical detection device of this application adopts on a plurality of pixel units that a plurality of lenses passed through and the convergent light beam arrives image sensing chip, pixel unit receive and convert the light beam for the signal of telecommunication to obtain external object's biological characteristic information. The electronic equipment has the advantages of small thickness, compact and small volume and size, and can be used in electronic equipment with limited internal space. The lens module of this application is including setting up the crosstalk of the light beam that sees through between a plurality of interval settings's lens can be reduced, improves sensing accuracy. In addition, when the lens module is pressed from top to bottom, the retaining wall can bear all or most of the pressure, and the first lens cannot deform or be damaged due to the action of the pressure, so that optical imaging cannot be influenced. Further, be provided with the buffer layer between display module assembly and the center frame, can effectively shelter from stray light, improve the imaging quality of imaging module assembly. The optical detection device and the electronic equipment have a good screen-down biological feature detection effect.

Drawings

FIG. 1 is a schematic view of an electronic device of the present application including an optical detection apparatus;

FIG. 2 is a schematic partial cross-sectional view of one embodiment of the optical detection apparatus of FIG. 1;

FIG. 3 is a schematic partial cross-sectional view of the light emitting unit of FIG. 2;

FIG. 4 is a schematic partial cross-sectional view of the imaging module of FIG. 2;

FIG. 5 is a schematic top view of a portion of the lens and the effective imaging area of the imaging module of FIG. 4;

FIG. 6 is a schematic top view of the imaging module and buffer layer of FIG. 2;

FIG. 7 illustrates a plurality of lenses partially arranged in a square grid and their corresponding effective photosensitive areas;

fig. 8 is a schematic top view of the buffer layer and imaging module shown in fig. 2.

Detailed Description

In the detailed description of the embodiments herein, it will be understood that when a substrate, a sheet, a layer, or a pattern is referred to as being "on" or "under" another substrate, another sheet, another layer, or another pattern, it can be "directly" or "indirectly" on the other substrate, the other sheet, the other layer, or the other pattern, or one or more intervening layers may also be present. The thickness and size of each layer in the drawings of the specification may be exaggerated, omitted, or schematically represented for clarity. Further, the sizes of the elements in the drawings do not completely reflect actual sizes.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

Further, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject technology can be practiced without one or more of the specific details, or with other structures, components, and so forth. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the focus of the application.

Is a schematic perspective view of an optical detection apparatus 1 according to one embodiment of the present application. The optical detection device 1 has a detection area VA on an outer surface of a front surface thereof, which can be contacted by an external object 1000. When the external object 1000 contacts the detection area VA, the optical detection apparatus 1 may acquire a biometric image of the external object 1000 and acquire corresponding biometric information. The external object 1000 may be a finger, for example, and the optical detection apparatus 100 may collect a fingerprint image of the finger to obtain corresponding fingerprint feature information. The optical detection device 1 may be configured with a display screen. The display screen can be an LCD display screen or an OLED display screen. In the normal use state of the optical detection apparatus 1, the direction in which the display screen of the optical detection apparatus 100 points or faces the user is defined as "up", and the opposite direction, or the direction away from the user is defined as "down". The optical inspection apparatus 1 has a length direction, a width direction and a thickness direction perpendicular to each other, and as shown in the drawing, the axes are represented by a Y axis, an X axis and a Z axis, respectively. It should be understood that the definitions of the directions in the embodiments of the present application are only for convenience of description and are not used as limitations of the embodiments of the present application.

In the present application, the optical detection device 1 is mainly described as an example of performing biometric information sensing. Such as, but not limited to, an OLED display or an LCD display, etc. The display screen may be used as an excitation light source for providing a light beam for detection, or an excitation light source may be additionally provided in the optical detection apparatus 1 for providing a light beam for detection.

The optical detection device 1 can be applied to suitable types of electronic products including, but not limited to, consumer electronics, home electronics, vehicle-mounted electronics, financial terminal products, and the like. The consumer electronic products include, for example, mobile phones, tablet computers, notebook computers, desktop monitors, all-in-one computers, and the like. Household electronic products are, for example, smart door locks, televisions, refrigerators and the like. The vehicle-mounted electronic product is, for example, a vehicle-mounted navigator, a vehicle-mounted DVD, or the like. The financial terminal products are ATM machines, terminals for self-service business and the like. The electronic device in the embodiments of the present application may further include other necessary modules or components in order to realize the basic functions of the electronic device. Taking the electronic device as a smart phone as an example, it may further include a communication module, a speaker, a microphone, a battery, and the like.

Referring to fig. 2, fig. 2 is a schematic cross-sectional view of the optical detection apparatus 1 along a line a-a in fig. 1, including the detection area VA. The optical detection device 1 comprises a protective layer 11, a display module 12, a middle frame 14, a light-emitting unit 16 and an imaging module 19. The protective layer 11 is located above the display module 12, the light emitting unit 16 and the imaging module 19. The upper surface (not numbered) of the protective layer 11 is the outermost surface of the optical detection apparatus 1. The detection area VA is at least a partial area of the upper surface of the protective layer 11. The line A-A in FIG. 1 is parallel to the Y axis and intersects the detection area VA. Further, the line a-a in fig. 2 may be a straight line parallel to the Y axis passing through the center point of the detection area VA. Alternatively, in some embodiments, the A-A line may also be a straight line parallel to the X-axis.

The protective layer 11 includes a transparent portion 114 capable of transmitting visible light and a non-transparent portion 112 capable of blocking visible light, and the non-transparent portion 112 is located around or at an edge of the transparent portion 114. The display module 12 is disposed opposite to the transparent portion 114, the display module 12 can emit visible light (not shown) through the transparent portion 114, and when the visible light is received by eyes of a user, image information or text information displayed by the display module 12 can be seen. The display module 12 includes a liquid crystal display panel 124 adjacent to the protective layer 11 and a backlight unit 122 located below the liquid crystal display panel 124. The backlight unit 122 is used to provide a surface emitting visible light to the side where the liquid crystal display panel 124 is located, and the visible light can penetrate the liquid crystal display panel and the transparent portion 114 of the protective layer 11. Optionally, in some embodiments, at least a portion of the detection area VA is a portion of the upper surface of the transparent portion 114.

The light emitting unit 16 is located under the opaque portion 112 of the protective layer 11. The light emitting unit 16 is used for providing a detection light beam 101, and the detection light beam 101 can penetrate through the protective layer 11 to reach an external object 1000 located above the protective layer 11. Alternatively, in the embodiment of the present application, the detection beam 101 can enter the external object 1000 and then be transmitted, or the detection beam 101 can be reflected by the external object 1000. For convenience of description, the detection light beam 101 reflected and/or transmitted by the external object 1000 is collectively referred to as the detection light beam 101 returned by the external object 1000. It is understood that the detection beam 101 returning from the external object 1000 carries biometric information of the external object 1000.

Fig. 3 is a partial cross-sectional view of the light-emitting unit 16. The light emitting unit 16 includes a light emitting element 162 and an adjusting element 164, and the light emitting element 162 may be an LED, a Mini-LED, a Micro-LED, a VCSEL, or the like. The number of the light emitting elements 162 may be one or more. The adjusting element 164 may be located above the light emitting element 162 and closer to the protection layer 11 than the light emitting element 162. The adjustment member 164 generally has an upwardly tapering wedge-shaped cross-sectional shape. The light emitting element 162 is configured to emit a detection light beam 101, and the adjusting element 164 is configured to adjust the detection light beam 101 emitted by the light emitting element 162. After the detection light beam 101 emitted by the light emitting element 162 is adjusted by the adjusting element 164, the light intensity of the detection light beam 101 emitted to the upper side or the upper side of the detection area VA becomes larger. Optionally, the adjusting element 164 includes a light incident surface (not numbered), a light reflecting surface (not numbered) inclined with respect to the upper surface of the protection layer 11, and a light emitting surface (not numbered) connected between the light incident surface and the light reflecting surface. The light incident surface may face a light emitting surface (not numbered) of the light emitting unit 162 for emitting the detection light beam 101, the reflection surface may face a side where the side portion 144 of the middle frame 14 is located, and the light emitting surface may face a side where the display module 12 is located.

The detection light beam 101 emitted by the light emitting unit 162 enters the adjusting element 164 from the light incident surface of the adjusting element 164, and is reflected by the reflective surface of the adjusting element 164 and then exits from the light exiting surface, and the exiting direction may be toward the upper side or the vicinity of the upper side of the detection region VA. Optionally, the detection light beam 101 may enter the adjustment element 164 from the light incident surface of the adjustment element 164, and then exit from the light exiting surface without being reflected by the reflection surface, and the exiting direction may be toward the upper side or the vicinity of the upper side of the detection area VA. Of course, the adjusting element 164 may have other different configurations, for example, the reflecting surface may have a plurality of planes and/or curved surfaces, and the light emitting surface may include planes and/or curved surfaces, which is understood by those skilled in the art and not limited thereto.

At least a part of the detection beam 101 emitted from the adjustment element 164 is emitted toward the upper side of the transparent portion 114 of the protective layer 11. Optionally, the propagation direction of the detection light beam 101 after exiting from the light guide space 164 is toward the upper side or the vicinity of the upper side of the detection area VA. Optionally, the incident angle when the detection light beam 101 enters the protection layer 11 after exiting from the adjustment element 164 is K, and the incident angle K may be greater than or equal to 30 degrees and less than or equal to 120 degrees. In this case, more detection light beams 101 may reach the external object 1000, or the detection light beams 101 reaching the external object 1000 may have a smaller optical path loss. Thus, the light utilization efficiency of the light emitting element 162 is effectively improved. Compared with the case without the adjusting element 164, the utilization rate of the detection light beam 101 emitted by the light-emitting element 162 can be improved by 10% to 50% after the adjusting element 164 is used. In addition, the same optical power can be realized with a smaller number of light emitting elements 162, and the cost of the light emitting elements 162 can be reduced to reduce heat generation, thereby achieving a better heat dissipation effect.

Referring to fig. 2 again, at least a portion of the imaging module 19 may be located below the display module 12. The detection beam 101 returning from the external object 1000 can be received by the imaging module 19 after penetrating the protective layer 11 and the display module 12 from the detection area VA. The imaging module 19 is capable of converting the received detection light beam 101 into a corresponding electrical signal that can be used to generate a biometric image of the external object 1000. The optical detection apparatus 1 may comprise a processor which may acquire biometric information of the external object 1000 from the biometric image by an image algorithm. For example, but not limited to, the external object 1000 may be a finger, the optical detection device 1 may be used to detect a fingerprint, and the biometric image may be a fingerprint image.

Alternatively, in some embodiments, the imaging module 19 may be disposed opposite to the detection area VA. Alternatively, the imaging module 19 may be set at any suitable position as long as the detection beam 101 returned by the external object 1000 can be received. For example, but not limited to, the imaging module 19 may include a light guide element for guiding the detection beam 101 returned from the external object 1000 to the imaging module 19. The light directing elements may be lenses, prisms, light pipes, mirrors, optical fibers, and the like.

Fig. 4 is a partial cross-sectional view of an embodiment of the optical detection apparatus 1. The embodiment shown in fig. 4 is substantially identical in structure to the embodiment shown in fig. 2. In the embodiment shown in fig. 4, the backlight unit 122 may include an optical assembly 125 and a bottom chassis 127. At least a portion of the bottom case 127 is located below the optical assembly 125, and the bottom case 127 may be used to support the optical assembly 125. The optical assembly 125 may be configured to emit visible light to the liquid crystal display panel 124, where the visible light can reach eyes of a user after passing through the liquid crystal display panel 124 and the protective layer 11, so as to implement display. In the embodiment of the present application, the detection beam 101 can pass through the liquid crystal display panel 124 and the optical assembly 125.

Alternatively, the bottom case 127 may be made of a metal material, so that the bottom case 127 is substantially opaque to visible light and the detection light beam 101. In order to allow the detection beam 101 returned by the external object 1000 to be received by the imaging module 19, the bottom case 127 has an opening 1271, and the position of the opening 1271 is substantially right above the imaging module 19. Thus, the detection beam 101 returned by the external object 1000 can pass through the protective layer 11, the liquid crystal display panel 124, the optical member 125 and the aperture 1271 and reach the imaging module 19. The imaging module 19 converts the received detection beam 101 into a corresponding electrical signal.

Alternatively, the position of the opening 1271 may have different designs, for example, in the Z-axis direction, the opening 1271 may face or partially face the imaging module 19, or the opening 1271 and the imaging module 19 may be offset from each other. So long as the detection beam 101 can be received by the imaging module 19 after passing through the opening 1271, all embodiments of the present application are covered.

Alternatively, in other or modified embodiments, the bottom case 127 may be made of resin, plastic, or the like.

Optionally, the bottom case 127 may include a material with a low basic transmittance for visible light and a high transmittance for the detection light beam 101 (e.g., a transmittance for the detection light beam 101 greater than or equal to 80%). Optionally, the bottom case 127 may include a material having a high transmittance for both the visible light and the detection beam 101.

Fig. 5 is a schematic structural diagram of the lcd panel 124 and the optical element 125 shown in fig. 4. The liquid crystal display panel 124 may include a first substrate 1221, a liquid crystal layer 1223, and a second substrate 1222 stacked in this order from bottom to top (upward in the Z-axis direction). The detection beam 101 can pass through the second substrate 1222, the liquid crystal layer 1223, and the first substrate 1221. The optical assembly 125 may include a reflective sheet 1251, a light guide plate 1252, and an optical film 1253 stacked in this order from bottom to top, and a light emitting element 1254 facing one side surface of the light guide plate 1252. The light emitting elements 1254 emit visible light, which enters the light guide plate 1254 from the side surface of the light guide plate 1252 adjacent to the light emitting elements 1254, and exits from the light guide plate 1254 toward the upper surface (not numbered) of the side where the liquid crystal display panel 124 is located. The reflective sheet 1251 can reflect visible light emitted from the bottom surface of the light guide plate 1252 back to the light guide plate 1252. The optical film 1253 serves to brighten and/or diffuse the visible light emitted from the upper surface of the light guide plate 1252. The visible light is brightened and/or diffused by the optical film 1253 and then irradiated to the liquid crystal display panel 124 in a surface emitting manner. The optical film 1253 may include one or more of a diffuser, a brightness enhancement sheet. Optionally, the optical assembly 125 may further include a backlight circuit board 1255, and the backlight circuit board 1255 is electrically connected to the light emitting element 1254 and provides the light emitting element 1254 with an electrical signal required for emitting light. The detection beam 101 can pass through the optical film 1253, the light guide plate 1252, and the reflective sheet 1251. Optionally, the reflector 1251 may have a multi-layer dielectric film structure, which has a high reflectivity to visible light (e.g., greater than 80%, 90%, 99% reflectivity to visible light) and a high transmittance to the detection beam 101 (e.g., greater than 50%, 60%, 70%, 80%, 90% transmittance to the detection beam 101). In the embodiment of the present application, the detection light beam 101 may be infrared light or near infrared light. By way of example and not limitation, the detection beam 101 may include near infrared light having a wavelength in the range of 780 nanometers to 2000 nanometers.

Fig. 6 is a partial cross-sectional view of the imaging module 19. The imaging module 19 includes a lens unit 192 and an image sensor chip 194 located below the lens unit 192. The lens unit 192 includes a plurality of spaced lenses 1922, and the lenses 1922 are used for converging the detection light beams 101, which are returned by the external object 1000 and pass through the protective layer 11 and the display module 12. As shown in fig. 4, the center-to-center distance between two adjacent lenses 1922 is P (which can be considered as the distance between the optical centers of two adjacent lenses 1922).

The detection light beam 101 converged by the lens 1922 is received by the image sensing chip 194 and converted into a corresponding electric signal. The image sensing chip 194 includes a plurality of pixel units 1944, and the plurality of pixel units 1944 constitute a light detection array of the image sensing chip 194. The detection light beams 101 can be received and converted into corresponding electrical signals by photoelectric conversion elements, such as photodiodes, of the plurality of pixel units 1944. In the present application, the light detecting array is also referred to as a photosensitive area or a photosensitive surface of the image sensor chip 194. The area where the detection beam 101 converged by the lens 1922 reaches the photosensitive area is defined as an effective photosensitive area 1942 of the lens 1922. The image sensing chip 194 includes a plurality of effective photosensitive regions 1942, and each of the plurality of effective sensing regions 1942 includes a plurality of pixel units 1944 for sensing light. Each of the plurality of effective photosensitive regions 1942 corresponds to one of the lenses 1922, and the effective photosensitive region 1942 is configured to receive the detection beam 101 converged by its corresponding lens 1922. It should be understood that portions of the plurality of lenses 1922 may have corresponding effective photosensitive regions 1942, and there may be portions of the lenses 1922 that do not have corresponding effective photosensitive regions 1942. For example, some of the lenses 1922 may not be directly opposite the photosensitive areas, or the detection beam 101 may not be focused on the photosensitive areas through the lenses 1922. At least some of the lenses 1922 in the plurality of lenses 1922 respectively correspond to partial regions of the detection region VA.

Alternatively, in some embodiments, each of the lenses 1922 faces a plurality of the pixel units 1944, and in this case, the lenses 1922 may be small lenses (Mini-lenses). However, alternatively, in some embodiments, the plurality of lenses 1922 may be directly opposite to the plurality of pixel units 1944, and in this case, the lenses 1922 may be Micro-lenses (Micro-lenses). Those skilled in the art will appreciate that the present application is not described in detail.

Referring also to fig. 7, a plurality of lenses 1922 are shown partially arranged in a square grid and their corresponding active photosensitive areas 1942. The partial area of the lens 1922 corresponding to the detection area VA is defined as a sub-detection area SVA. Among the sub-detection regions SVAs of the plurality of lenses 1922 shown in fig. 5, the sub-detection regions SVAs of adjacent lenses 1922 have an overlapping region. In other or alternative embodiments, the sub-detection regions SVAs may not overlap or have a gap therebetween. It is understood that in some embodiments, although the plurality of sub-detection regions SVAs can fill most of the detection region VA, there may still be a case where the detection beam 101 transmitted through the detection region VA cannot reach the effective sensing region 1942 corresponding to a certain lens 1922.

It can be seen that the corresponding plurality of active sensing regions 1942 of the plurality of lenses 1922 are spaced from one another. The effective photosensitive area 1942 has the same square grid arrangement as the plurality of lenses 1922. Of course, the present application is not so limited and, in other or alternative embodiments, the plurality of lenses 1922 may have one or more of an equilateral triangular grid, a square grid, an equilateral hexagonal grid, or any other suitable grid arrangement.

Optionally, in some embodiments, the lens unit 192 further includes a blocking wall 1924 disposed on the spacing region of the lens 1922, where the blocking wall 1924 can block the light beam of the first preset wavelength band, and the first preset wavelength band includes the wavelength of the detection light beam 101.

Of course, in some embodiments, as shown in fig. 4, the lens unit 192 may further include a light shielding layer 1926 covering the blocking wall 1924, where the light shielding layer 1926 can shield the light beam of the first preset wavelength band, and the first preset wavelength band includes the wavelength of the detection light beam 101. The light-shielding layer 1926 may completely cover the spaced regions of the lens 1922, so that the detection beam 101 can only pass through the lens 1922. In other embodiments, the light-shielding layer 1926 may cover only the interval regions of the lenses 1922.

Alternatively, in some embodiments, the plurality of lenses 1922 may be arranged in a regular pattern. Alternatively, however, in some embodiments, the plurality of lenses 1922 may be arranged in a non-regular two-dimensional pattern. Alternatively, in some embodiments, the retaining walls 1924 may be only partially disposed between adjacent lenses 1922, or the retaining walls 1924 may be disposed between any adjacent lenses 1922.

Optionally, in some embodiments, the lens unit 192 further includes an optical spacer layer (not shown) below the lens 1922 and the barriers 1924. The lens 1922 and the retaining wall 1924 may be formed in one step by an embossing process, and the lens 1922 and the retaining wall 1924 may be made of a material such as a light-transmitting resin and an optical adhesive. The materials of the optical spacer layer and the lenses 1922 and the retaining walls 1924 may be the same or partially the same or different. The optical spacer layer may be a residual layer when the lenses 1922 and the stoppers 1924 are formed. Of course, the optical spacer layer may also be formed to have a certain thickness when the lens 1922 and the retaining wall 1924 are formed. Alternatively, in some embodiments, the lens 1922, the barriers 1924, and the optical spacer layer may be made of other materials or processes. Optionally, in some embodiments, the optical spacer layer may be omitted.

Optionally, in some embodiments, the lens 1922 is an incident surface (not numbered) including a spherical surface or an aspheric surface, and a circular bottom surface opposite to and connected to the incident surface, and the lens 1922 of this structure is referred to as a circular lens. It is understood that the bottom surface of the lens 1922 may be rectangular, hexagonal, or other geometric shapes, and correspondingly, the lens 1922 may be a rectangular lens, a hexagonal lens, or the like. The plurality of lenses 1922 is made of a transparent material. Such as, but not limited to, transparent acrylic, transparent glass, UV glue material, and the like. This is not a limitation of the present application. When the lens 1922 is a circular lens, the corresponding active sensing region 1942 may be circular. The bottom surface of the lens 1922 shown in figure 3 is circular with a diameter d. In some embodiments, as a description for facilitating understanding of the embodiments of the present application, a person skilled in the art can understand that the bottom surface of the lens 1922 may be an actual surface or an imaginary surface.

It can be understood that if the adjacent lenses 1922 are too close to each other, the detection beam 101 passing through one lens 1922 can easily strike the effective sensing area 1942 corresponding to the adjacent lens 1922, which may affect the imaging quality of the image sensor chip 194. In order to prevent crosstalk from occurring in the detection beam 101 transmitted through the adjacent lenses 1922, it is generally necessary to arrange the adjacent lenses 1922 at an interval, and when the center-to-center pitch P of the adjacent lenses 1922 is greater than or equal to 1, 1.5, 2, 3, 4, 5, or 6 times the diameter d of the lenses 1922, the occurrence of crosstalk can be preferably avoided. The center-to-center pitch P may be any value from 300 microns to 500 microns, for example, but not limited to, the center-to-center pitch P may be 300 microns, 350 microns, 400 microns, 450 microns. Optionally, the diameter d of the lens 1922 may be any value from 80 microns to 300 microns, for example, but not limited to, the diameter d of the lens 1922 may be 100 microns, 120 microns, 140 microns, 150 microns, 200 microns, and the like.

Optionally, in some embodiments, the area of the effective photosensitive region 1942 may be greater than, equal to, or smaller than the area of the light-emitting surface of the lens 1922.

Alternatively, the height of the retaining wall 1924 may be higher than that of the lens 1922, for example, the height of the retaining wall 1924 may be regarded as the maximum vertical height of the retaining wall 1924 relative to the plane of the bottom surface of the lens 1922, and the height of the lens 1922 may be regarded as the maximum vertical height of the retaining wall 1922 relative to the plane of the bottom surface. By way of example and not limitation, the barriers 1924 may be higher than the lenses 1922 by any number from 0 to 100 microns. Further alternatively, the barriers 1924 may be higher than the lenses 1922 by any value from 5 microns to 10 microns. Since the barriers 1924 are higher than the lenses 1922 and the light shielding layer 1926 covers the barriers 1924, an interference light beam from an oblique side of the lenses 1922 can be shielded by the light shielding layer 1926 and does not pass through the lenses 1922 and then reach the effective sensing regions 1942 corresponding to the adjacent lenses 1922, so that the problem of crosstalk between the adjacent lenses 1922 is effectively avoided. In addition, when the lens unit 192 is pressed from top to bottom, the retaining wall 1924 can bear all or most of the pressure, and the lens 1922 is not deformed or damaged by the pressure, so that the optical imaging of the image sensor chip 194 is not affected. Of course, alternatively, in some embodiments, the height of the retaining wall 1924 may be equal to or less than the lens 1922.

Optionally, in some embodiments, the imaging module 19 further includes a substrate (not shown) located between the lens unit 192 and the image sensor chip 194. The lens unit 192 is disposed on the substrate, and the substrate is used for carrying the lens unit 192. The substrate may be an optical film made of glass, resin, or any suitable light transmissive material through which the detection beam 101 is transmitted. Of course, alternatively, the lens unit 192 may be directly formed on the image sensing chip 194, that is, the image sensing chip 194 serves as a carrier substrate of the lens unit 192. The image sensing chip 194 may be a die or a packaged chip. Compared to manufacturing the lens unit 192 on a substrate and then fixing the substrate carrying the lens unit 192 and the image sensing chip 194 by, for example, an adhesive, the entire thickness of the imaging module 19 can be made thinner by forming the lens unit 192 directly on the image sensing chip 194.

Optionally, in some embodiments, the optical detection device 1 further comprises a filter layer 196. The filter layer 196 is used to transmit the detection beam 101 and filter out light beams other than the detection beam 101, thereby reducing the interference of stray light on the sensing accuracy. Alternatively, in some other embodiments, the filter layer 196 is configured to filter out a second predetermined wavelength band of light, and the light shielding layer 1926 is configured to filter out a first predetermined wavelength band of light, wherein the first predetermined wavelength band is completely different from or completely the same as or partially the same as the second predetermined wavelength band, and the second predetermined wavelength band does not include the wavelength of the detection light beam 101. When the first preset waveband is the same as the second preset waveband, the first preset waveband comprises the second preset waveband. For example, the first preset wavelength band includes a visible light band and a near infrared light band, and the second preset wavelength band includes a visible light band. The filter layer 196 is, for example, a visible light cut filter capable of cutting off visible light. Alternatively, in some embodiments, the filter layer 196 may be disposed directly on the image sensing chip 20. Of course, in some embodiments, the filter layer 196 is disposed above the lens unit 192, or in other embodiments, the number of the filter layer 196 is two, and two filter layers 196 may be disposed above the lens unit 192 and on the image sensing chip 20 (between the lens unit 192 and the image sensing chip 194), respectively. The filter layer 196 disposed above the lens unit 192 includes a lens 1922 and a light-shielding layer 1926 disposed with a gap from the lens unit 192 or covering the lens unit 192 without a gap.

In some embodiments, when the lens unit 192 includes a substrate, the substrate may be attached to the filter layer 196 by an adhesive. The adhesive can be DAF (die attach film), liquid glue, solid glue, optical glue and the like. The embodiments of the present application do not limit this.

The term "filtering" as used in the description herein is to be understood as the obstruction of the light beam. The target wavelength band may be in the wavelength range from 780 nanometers to 2000 nanometers. The wavelength of the detection beam 101 may be in the range of the target wavelength band. For the liquid crystal display module 12, the detection beam 101 may be near infrared light, and at this time, the detection beam 101 is not visible to human eyes, so that normal display of the liquid crystal display module is not affected, and meanwhile, the detection of the biological characteristics under the screen can be better realized.

Alternatively, in some embodiments, at least part of the detection light beam 101 provided by the light emitting unit 16 may exit from the non-transparent portion 112 to the external object 1000, and at least part of the detection light beam 101 returning from the external object 1000 may penetrate the protective layer 11 and the display module 12 from the transparent portion 114, and then be received by the imaging module 19 and converted into an electrical signal.

Optionally, in this embodiment, the detection beam 101 may be a near-infrared beam with a wavelength of 750 nm to 2000 nm. Of course, the present application is not limited thereto, and in other or modified embodiments, the detection beam 101 may be visible light, near infrared light, electromagnetic waves, ultraviolet light, ultrasonic waves, or any other suitable signal.

The middle frame 14 is used for protecting the display module 12. The middle frame 14 may also support the display module 12. The middle frame 14 and the protective layer 11 together form a receiving space, and the display module 12, the imaging module 19 and the light emitting unit 16 are located in the receiving space. The middle frame 14 includes a bottom portion 142 and side portions 144. The bottom portion 142 includes a substantially flat plate-like structure, and the side portion 144 extends upward (Z-axis direction in fig. 2) from an edge of the bottom portion 142 and is connected to the opaque portion 112 of the protective layer 11. Optionally, in some embodiments, the light emitting unit 16 is located between the side 144 of the middle frame 14 and the display module 12. The light emitting unit 16 may be fixed on the side portion 144. Optionally, in some embodiments, the imaging module 19 is located between the display module 12 and the bottom 142 of the middle frame 14. The imaging module 19 is fixed on the bottom 142 of the middle frame 14, and a gap 100 is formed between the imaging module 19 and the display module 12. For example, but not limited to, air is provided between the imaging module 19 and the display module 12. Thus, a gap 100 exists between the imaging module 19 and the display module 12, so that the imaging module 19 is disassembled and assembled without damaging the display module 12. In addition, when some shock or collision occurs, the imaging module 19 does not contact the display module 12 due to the gap 1000, so that the imaging module 19 can be protected from being damaged.

The optical detection device 1 may further comprise a buffer layer 17. The buffer layer 17 is located between the display module 12 and the bottom 142 of the middle frame 14. Fig. 8 is a schematic top view of the buffer layer 17 and the imaging module 19 shown in fig. 2. It should be noted that the imaging module 19 may include a circuit board connected to an external circuit, and the circuit board is used for providing electrical signals required for the operation of the image sensing chip 194, and is not shown in fig. 8. The circuit board may be a flexible circuit board (FPC) having a very thin thickness that may be placed against the upper surface of the bottom portion 142 of the middle frame 14, as will be appreciated by those skilled in the art. Alternatively, when the backlight unit 12 includes a bottom case 127, the buffer layer 17 is disposed between the bottom case 127 and the bottom 142, and the buffer layer 17 may be closely attached to the lower surface of the bottom case 127 and the upper surface of the bottom 142.

The buffer layer 17 may be located at least in a partial region around the imaging module 19. For example, but not limited to, the buffer layer 17 may be disposed around the imaging module 19. The buffer layer 17 may be used to reduce stray light entering the imaging module 19. The stray light may be an interference light beam formed by reflection, refraction, and the like of visible light or non-visible light (such as the detection light beam 101) inside the optical detection apparatus 1, and may cause an adverse interference to the imaging module 19 receiving the detection light beam 101 with the biometric information returned by the external object 1000 and generating the biometric image. Therefore, the buffer layer 17 blocks the stray light, so that the imaging quality of the imaging module 19 is better, and the biological characteristic detection efficiency of the optical detection device 1 is higher. Of course, in other or modified embodiments, the buffer layer 17 may be disposed on at least one side of the imaging module 19, or have other position configurations, and the embodiment of the present application is not particularly limited. The buffer layer 17 may be made of a material that is opaque to the detection beam 101. By way of example and not limitation, the buffer layer 17 may comprise foam that does not transmit the detection beam 101, or resin, rubber, plastic, etc. that does not transmit the detection beam 101. Optionally, in some embodiments, the buffer layer 17 may be used to protect the display module 12. For example, after the optical detection device 1 is assembled, the buffer layer 17 may be relaxed in stress, and may have a good effect of buffering, shock absorption, dust prevention, sound insulation, and the like.

At present, in the prior art, the optical detection under the screen uses a large lens to cooperate with an image sensing chip, and the large lens needs to converge the detection light beam returned by the external object 1000 from the whole detection area VA onto the image sensing chip for imaging. It should be understood that for a convex lens, the larger the size of the lens, the larger the focal length, and the larger the image distance and object distance required for imaging. The imaging module 19 of the present application uses a plurality of lenses 1922, the lenses 1922 being small lenses having a size and focal length much smaller than the large lenses commonly used in the prior art. The lenslets 1922 actually receive the detection beam 101 transmitted through a localized area of the detection region VA. Therefore, the distance from the detection area VA to the image sensor chip in the prior art is larger than the distance from the detection area VA to the image sensor chip 194 when the optical detection device 1 is used for biometric detection (e.g., fingerprint detection) in the embodiment of the present application. Therefore, compared with the prior art, the imaging module 19 of the present application has a more compact and compact volume and size, and can be used in the optical detection device 1 and electronic equipment, such as a mobile phone, a tablet computer, and a smart watch, which have more strict requirements on the occupation of the internal space. The whole thickness of the imaging module 19 of this application can reach within 0.5 millimeter, for example 0.4 millimeter, 0.35 millimeter or less, the imaging module 19 can be used as ultra-thin camera, or be applied to in the below of display module 12 is in order to realize the optical biological feature detection under the screen.

In addition, since the plurality of lenses 1922 are used for transmitting the detection beams 101 from the local regions of the detection region VA, the actual light flux of the imaging module 19 may be smaller than that when a large lens is used to converge the detection beams 101 from the entire detection region VA in the prior art. Therefore, in the embodiment of the present application, the light emitting unit 16 includes the adjusting element 164, and the adjusting element 164 can be used to increase the light intensity of the detection light beam 101 emitted to above or near above the detection area VA, so that the energy of the detection light beam 101 received by the image sensing chip 194 is large, and the generated biometric image can meet the biometric identification requirement.

It should be understood that the specific examples in the embodiments of the present application are for the purpose of promoting a better understanding of the embodiments of the present application and are not intended to limit the scope of the embodiments of the present application.

It is to be understood that the terminology used in the embodiments of the present application and the appended claims is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. For example, as used in the examples of this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

Those of ordinary skill in the art will appreciate that the elements of the examples described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the several embodiments provided in the present application, it should be understood that the disclosed system and apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present application.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially or partially contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

It should be noted that part or all of the structures, functions, and methods of the embodiments of the present application can be applied to other or modified embodiments, and are not limited to the embodiments described in correspondence thereto, and all embodiments obtained thereby belong to the scope of the present application. In addition, in the embodiment of the present application, the light beam may be visible light or invisible light, and the invisible light may be near infrared light, for example. The terms "overlap", "overlap" and "overlapping" as may appear in the description of the present application should be understood to have the same meaning and to be interchangeable.

Any reference in this specification to "one embodiment," "an embodiment," "example embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature or structure is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature or structure in connection with other ones of the embodiments.

The orientations or positional relationships indicated by "length", "width", "upper", "lower", "left", "right", "front", "rear", "back", "front", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, which may appear in the specification of the present application, are based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application. Like reference numbers and letters refer to like items in the figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance. In the description of the present application, "plurality" or "a plurality" means at least two or two unless specifically defined otherwise. In the description of the present application, it should also be noted that, unless explicitly stated or limited otherwise, "disposed," "mounted," and "connected" are to be understood in a broad sense, e.g., they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. The terms used in the following claims should not be construed to limit the invention to the specific embodiments disclosed in the specification. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (20)

1. An optical inspection apparatus, comprising:

a protective layer including a transparent portion capable of transmitting visible light and a non-transparent portion capable of blocking visible light;

the display module is positioned below the protective layer and comprises a liquid crystal display panel and a backlight unit positioned below the liquid crystal display panel, the backlight unit provides visible light to one side where the liquid crystal display panel is positioned, and the visible light can penetrate through the liquid crystal display panel and is emitted to the outside through a transparent part of the protective layer to realize image display;

the middle frame is used for protecting the display module, the display module is positioned between the protective layer and the middle frame, the middle frame comprises a bottom part and a side part, the side part extends upwards from the edge of the bottom part and is connected with the protective layer, the middle frame and the protective layer form an accommodating space, and the display module is accommodated in the accommodating space;

the imaging module is positioned between the bottom of the display module and the middle frame and used for receiving the detection light beam which penetrates through the protective layer and the display module and is provided with external object biological characteristic information, the received detection light beam is converted into an electric signal, the electric signal is used for generating a biological characteristic image of an external object, the detection light beam can penetrate through the liquid crystal display panel and the backlight unit, the imaging module comprises a lens unit and an image sensing chip which is positioned below the lens unit, the lens unit comprises a plurality of lenses which are arranged at intervals and used for converging the detection light beam, the detection light beam converged by the lens is received by the image sensing chip and converted into a corresponding electric signal, wherein the image sensing chip comprises a plurality of effective photosensitive areas, and each of the effective photosensitive areas comprises a plurality of pixel units used for photosensitive, each of the plurality of effective photosensitive areas corresponds to one of the lenses, and the effective photosensitive areas are used for receiving the detection light beams converged by the corresponding lenses.

2. The optical inspection device as claimed in claim 1, further comprising a buffer layer disposed between the display module and the bottom of the middle frame and around the imaging module, wherein the buffer layer is configured to reduce stray light entering the imaging module.

3. The optical inspection device of claim 1, wherein the imaging module is fixed to the bottom of the middle frame with a gap between the imaging module and the display module.

4. The optical inspection device of claim 1, wherein the top surface of the protective layer has an inspection area from which at least a portion of an inspection beam transmitted through the protective layer and the display module is receivable by the imaging module, the at least a portion of the inspection area being located in a transparent portion of the protective layer.

5. The optical inspection device as claimed in claim 1, wherein the lens is a convex lens including a convex surface facing away from the image sensor chip, the inspection beam enters the lens from the convex surface and is converged to exit from the lens unit toward a side of the image sensor chip, and a center-to-center distance between two adjacent lenses is greater than or equal to 1, 1.5, 2, 3, 4, 5, or 6 times a diameter of the lens.

6. The optical inspection device of claim 1, wherein the lens unit further includes a dam wall disposed on the spacing region of the lens, wherein: the barricade can shelter from the light beam of first predetermined wave band, first predetermined wave band includes the wavelength of detecting beam, perhaps the camera lens unit is still including covering the light shield layer of barricade, the light shield layer can filter first predetermined wave band light beam.

7. The optical inspection device of claim 6 wherein the retaining wall is taller than the lens.

8. The optical detection device according to claim 6, further comprising a filter layer formed on the image sensing chip and/or above the lens unit; the filter layer is used for the transmission detecting light beam and filters the light beam of the second preset wave band, the second preset wave band does not include detecting light beam's wavelength, works as when the camera lens unit includes the light shield layer, the light shield layer is used for filtering the light beam of the first preset wave band, the first preset wave band with the second is preset the wave band and is totally different or the same or partly the same, works as the first preset wave band with the second is preset the wave band part and is the same, the first preset wave band includes the second is preset the wave band.

9. The optical inspection device of claim 8 wherein the inspection beam includes near infrared light and the filter layer is a visible light cut filter for filtering visible light and transmitting near infrared light.

10. The optical inspection device of claim 9, wherein the lens unit further includes a substrate on which the plurality of lenses and the blocking wall are disposed, the substrate being capable of transmitting the inspection beam, the filter layer being disposed between the substrate and the image sensing chip when the filter layer is formed on the image sensing chip.

11. The optical detection device as claimed in claim 1, further comprising a filter layer disposed between the lens unit and the image sensing chip or formed on a side of the lens unit opposite to the image sensing chip, wherein the filter layer is configured to transmit near infrared light and filter out visible light, and the detection beam includes near infrared light.

12. The optical inspection device of claim 1, further comprising a light emitting unit located between the display module and the side portion of the middle frame, the light emitting unit being configured to emit an inspection light beam, at least a portion of the inspection light beam passing directly through the opaque portion of the protective layer to an external object located above the protective layer, the external object reflecting and/or transmitting the inspection light beam to form the inspection light beam with the biometric information of the external object.

13. The optical detection apparatus according to claim 12, wherein the light emitting unit includes a light emitting element that emits the detection light beam, and an adjustment element that adjusts at least a part of the detection light beam emitted by the light emitting element such that the detection light beam adjusted by the adjustment element is emitted toward above the transparent portion of the protective layer.

14. The optical inspection device of claim 13, wherein the top surface of the protection layer has an inspection area, at least a portion of the inspection beam transmitted from the inspection area through the protection layer and the display module is receivable by the imaging module, and the inspection beam adjusted by the adjustment element is capable of being emitted above or near the inspection area.

15. The optical inspection device of claim 13, wherein the angle of incidence of the inspection beam upon entering the protective layer after exiting the conditioning element is greater than or equal to 30 degrees and less than or equal to 120 degrees.

16. The optical inspection device of claim 1, wherein the plurality of lenses have one or more of an arrangement of an equilateral triangular grid or a square grid or an equilateral hexagonal grid.

17. The optical inspection device as claimed in claim 6, wherein the lens unit further includes an optical spacer layer located below the lens and the dam, the optical spacer layer being located above the image sensor chip, the optical spacer layer and the lens and the dam being an integral structure.

18. The optical inspection device as claimed in claim 17, wherein the lens and the retaining wall are formed by a stamping process, the optical spacer layer is a residual layer when the lens and the retaining wall are formed, and the materials of the lens, the retaining wall and the optical spacer layer are the same or partially the same or different.

19. The optical inspection device according to claim 1, wherein the backlight unit includes an optical assembly and a bottom chassis, at least a portion of the bottom chassis is located below the optical assembly, the bottom chassis is configured to support the optical assembly, the optical assembly is configured to emit visible light toward the liquid crystal display panel, the bottom chassis has an opening, and the detection beam returned by the external object passes through the protective layer, the liquid crystal display panel, the optical assembly and the opening to be received by the imaging module and converted into an electrical signal.

20. An electronic device comprising the optical detection apparatus according to any one of claims 1 to 19, wherein the electronic device is configured to obtain fingerprint feature information of an external object according to the detection light beam received by the optical detection apparatus.

Images