CN210402398U - Optical detection device - Google Patents

Abstract

The utility model discloses an optical detection device, which comprises a display device, a protective layer and a control unit, wherein the protective layer is arranged above the display module, the display module can emit visible light through the protective layer to realize image display, and the protective layer is provided with a first surface for an external object to contact so as to realize interaction or biological characteristic detection; the emission module is positioned below the protective layer, the vertical projections of the emission module and the display module on the first surface are not overlapped or partially overlapped, the emission module is used for emitting detection light beams, and the detection light beams can be projected to the side faces with different directions of an external object through the protective layer; the detection module, the detection light beam that returns from external object can see through protective layer and display screen quilt the detection module receives, and the detection module converts the detection light beam who receives into corresponding signal of telecommunication in order to obtain external object's biological characteristic information. The utility model discloses can realize better under the screen fingerprint detection effect.

Description

Optical detection device

Technical Field

The utility model relates to the field of photoelectric technology, especially, relate to an utilize optical imaging to realize the optical detection device that fingerprint detected or other detected.

Background

With the technical progress and the improvement of living standard of people, users demand more functions and fashionable appearance for electronic products such as mobile phones, tablet computers, cameras and the like. At present, the development trend of electronic products such as mobile phones and the like is to have higher screen occupation ratio and have the 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 product has a high screen occupation ratio, and the fingerprint detection technology under the screen is developed. However, the prior art has no suitable under-screen detection scheme for non-self-luminous displays such as liquid crystal display screens.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides an optical detection device that can solve prior art problem.

An aspect of the present invention provides an optical detection apparatus, which can actively emit light onto an external object and realize biometric detection by receiving return light of the external object, including: the liquid crystal display device comprises a liquid crystal display module and a protective layer, wherein the protective layer is positioned above the liquid crystal display module and is provided with a first surface which is contacted by an external object to realize interaction or biological characteristic detection, the liquid crystal display module comprises a liquid crystal display unit and a backlight unit, the backlight unit is used for providing a backlight beam of visible light for the liquid crystal display unit, the backlight beam can be emitted to the outside through the liquid crystal display unit and the protective layer to realize image display, the first surface of the protective layer is provided with a length axis and a width axis which are vertical to each other, and the protective layer is provided with a top part and a bottom part which are oppositely arranged along the length axis direction; the emission module is positioned below the first surface, vertical projections of the emission module and the liquid crystal display module on the first surface are not overlapped or partially overlapped, the emission module comprises three groups of light-emitting units, the intervals between the adjacent groups are equal, the three groups of light-emitting units are arranged below the bottom of the protective layer and are arranged in a row along the direction parallel to the width axis, the first plane is provided with a central axis along the direction parallel to the length axis, the orthogonal projections of the first group, the second group and the third group of light-emitting units on the first plane are distributed in an axial symmetry mode relative to the first plane along the central axis parallel to the length axis, the three groups of light-emitting units can emit detection light beams of near infrared light, and the detection light beams can be projected onto side surfaces of external objects with different orientations through the protective layer; and the detection module is at least partially positioned below the liquid crystal display module or inside the liquid crystal display module, the detection light beam returned from the external object can penetrate through the protective layer and at least part of the liquid crystal display module to be received by the detection module, and the detection module converts the received detection light beam into a corresponding electric signal to acquire the biological characteristic information of the external object.

In some embodiments, each group of the light emitting units includes two light emitting units, and the center-to-center distances between adjacent light emitting units in each group are equal, and the center-to-center distances between adjacent groups are different from the distances between adjacent light emitting units in each group; or, at least one group of light-emitting units comprises no less than two light-emitting units, and the center distance between adjacent light-emitting units in the group of light-emitting units is smaller than that between adjacent groups of light-emitting units.

In some embodiments, a length of the emission module in a direction parallel to the width axis is not less than a length of an external object in a direction parallel to the protective layer width axis.

In some embodiments, the side surfaces of the external object having different orientations include a first side surface, a second side surface, and a third side surface, the three groups of light emitting units of the emission module are respectively a first group of light emitting units for projecting the detection light beam to the first side surface of the external object, a second group of light emitting units for projecting the detection light beam to the second side surface of the external object, and a third group of light emitting units for projecting the detection light beam to the third side surface of the external object, the protection layer has a first side portion and a second side portion oppositely arranged along the width axis direction, the first side surface faces the first side portion, the second side surface faces the second side portion, and the third side surface faces the bottom or the top.

In some embodiments, the detection light beam can enter the external object from the first side surface, the second side surface and the third side surface, and the detection light beam entering the external object can exit from the bottom surface of the external object and penetrate through the protective layer to be received by the detection module.

In some embodiments, the external object is a finger, the bottom surface of the finger includes a fingerprint, and the fingerprint is in contact with a field area of the detection module on the first surface during detection, where the field area is a portion of the first surface located within a field angle range of the detection module.

In some embodiments, the three groups of light emitting units of the emission module are respectively a first group of light emitting units, a second group of light emitting units, and a third group of light emitting units, the first surface has a central axis parallel to the length axis, an orthographic projection of the third group of light emitting units on the first surface intersects the central axis of the first surface parallel to the length axis, the first group of light emitting units and the second group of light emitting units are located on two sides of the third group of light emitting units, a distance between a center of the first group of light emitting units and a center of the third group of light emitting units is L1, a distance between a center of the second group of light emitting units and a center of the third group of light emitting units is L2, a portion of the first surface located in the field angle range of the detection module is a field area, a distance between a center of the field area and a center of the orthographic projection of the third group of light emitting units on the first surface is L3, and the field area is a portion of the first surface located, l1 ═ L2 ═ 8 mm to 21 mm, and L3 ═ 10 mm to 18 mm.

In some embodiments, the three groups of light-emitting units respectively include two light-emitting units, the distance between the centers of the two light-emitting units of the same group of light-emitting units is 1.65 mm to 3 mm, and the minimum distance between the edges of the adjacent groups of light-emitting units is 6 mm to 20 mm.

In certain embodiments, the field of view region has a diameter in a range of 7 mm to 10 mm.

In some embodiments, the liquid crystal display device further includes a housing for receiving and supporting the liquid crystal display module and the protective layer, the housing includes a bottom portion located below the liquid crystal display module and a side portion connected to the protective layer, and the emission module is fixedly connected to the side portion.

In some embodiments, the light emitting unit has a bottom surface connected to the side portion and a light emitting surface for emitting the detection beam, the light emitting surface is a side surface of the light emitting unit, the light emitting unit is a side light emitting type light emitting device, and the light emitting surface is parallel to the first surface or disposed at an acute angle.

In some embodiments, the protective layer has a transparent region and a non-transparent region located around the transparent region, the bottom and top of the protective layer are located in the non-transparent region, the transparent region being capable of transmitting visible light and a detection beam, the non-transparent region is capable of blocking visible light and transmitting a detection beam, the predetermined region is at least partially located in the non-transparent region, the viewing field area is at least partially positioned in the transparent area, the liquid crystal display module is partially or completely positioned below the transparent area, the emission module is positioned below the non-transparent area, the detection module is partially or completely positioned below the liquid crystal display module, the liquid crystal display module can transmit the detection light beam, the liquid crystal display module can emit visible light through the transparent area, the detection module can receive the detection light beam returned by the external object through at least part of the liquid crystal display module.

In some embodiments, the detection beam returned by the external object comprises: the detection beam reflected and/or transmitted by the external object.

In some embodiments, the light emitting unit has a light emitting surface, the protective layer has a second surface opposite to the first surface, and a center of the light emitting surface and the second surface of the protective layer are spaced by a predetermined distance, where the predetermined distance is 0 to 1 mm, or 1 mm to 3 mm.

In some embodiments, the light emitting unit has a light emitting angle of 140 degrees in a length axis direction of the first surface and a light emitting angle of 140 degrees in a width axis direction of the first surface.

In some embodiments, the external object comprises a finger, a palm, a toe, a skin and the detection beam is used for detecting fingerprint, palm print, and toe features.

In some embodiments, the optical detection device is a mobile phone, a tablet computer, a smart watch, an augmented reality/virtual reality device, a human motion detection device, an autonomous vehicle, smart home equipment, security equipment, an intelligent robot, or a combination thereof.

The beneficial effects of the utility model reside in that, compare in prior art, in this application embodiment and the change embodiment, through disposing the transmission module for the transmission module can be with detecting beam projection outside the object have different orientation on the side, like this, outside object receives detecting beam's angle and light quantity are more, and detecting module receives the detecting beam that outside object transmitted out and has better formation of image effect, thereby has improved the efficiency and the accuracy that biological characteristic detected.

Drawings

FIG. 1 is a schematic view of one embodiment of an optical inspection apparatus of the present invention;

FIG. 2 is a partial cross-sectional view of the optical detection device of FIG. 1;

FIG. 3 is a partial cross-sectional view of the optical detection device of FIG. 1;

FIG. 4 is a schematic view of the optical detection device of FIG. 1;

FIG. 5 is a schematic view of the optical detection device shown in FIG. 3;

fig. 6A and 6B are partial schematic views of a light emitting unit of an emission module;

fig. 7 is a partial cross-sectional view of one embodiment of the optical inspection device of the present invention;

fig. 8 is a partial cross-sectional view of one embodiment of the optical inspection device of the present invention.

Detailed Description

In the detailed description of the embodiments of the invention, 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 invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

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.

Referring to fig. 1 to fig. 3, fig. 1 is a schematic front top view of an optical detection apparatus 1 according to an embodiment of the present invention, and fig. 2 shows a partial view of the optical detection apparatus 1 along a line a-a in fig. 1. FIG. 3 shows a partial view of the optical detection device 1 of FIG. 1 along line B-B. In fig. 1 to 3, the "X axis" in the three-axis orthogonal coordinate system may correspond to the width direction of the optical detection device 1, the "Y axis" may correspond to the length direction of the optical detection device 1, and the "Z axis" may correspond to the thickness direction of the optical detection device 1.

The optical detection device 1 includes a display device 10, an emission module 18 and a detection module 19. The emission module 18 and the detection module 19 may be configured to be located inside the display device 10 as shown. The display device 10 includes a protective layer 11, a display module 12, and a housing 13. The display module 12 is located below the protection layer 11. The emission module 18 and the display module 12 are arranged below the protective layer 11 in parallel.

The protective layer 11 may include a first surface 111 facing upward (positive Z-axis direction, Z +). The first surface 111 is used for contact by the external object 1000 for interaction or for collecting biometric information of the external object 1000. The protective layer 11 has a transparent region 120 and a non-transparent region 110, as shown in fig. 1, the non-transparent region 110 is located around the transparent region 120. The transparent area 120 can transmit visible light from the display module 12, and a user can receive the visible light emitted from the transparent area 120 by the display module 12 through the first surface 111, thereby "seeing" the information displayed by the display module 12. The first surface 111 is generally rectangular having a length axis (Y-axis) and a width axis (X-axis) that are perpendicular to each other. Alternatively, in some embodiments, the corners of the first surface 111 may be curved. The protective layer 11 further comprises a second surface 112 opposite the first surface 111. In this embodiment, the first surface 111 is an upper surface of the protection layer 11, the second surface 112 is a lower surface of the protection layer 11, and the first surface 111 and the second surface 112 are disposed opposite to each other. Alternatively, in other or modified embodiments, the second surface 112 may be a bevel or a side of the protective layer 11. The side of the protective layer 11 may be a plane or a curved surface.

The non-transparent region 110 is used for transmitting the detection light beam 101 and blocking the visible light beam. In embodiments of the present application, the non-transparent region 110 has a transmittance of greater than 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, or 90% for the detection light beam 101. When the transmittance of the non-transparent area 110 for the detection beam 101 is larger, the intensity of the detection beam 101 after penetrating the protective layer 11 is larger.

In addition, the non-transparent region 110 blocks the visible light beam by: the transmittance of the non-transparent region 110 for visible light beams is less than 10%, 5%, or 1%, even if the transmittance of the non-transparent region 110 for visible light beams is 0. The less the non-transparent region 110 transmits the visible light beam, the more the non-transparent region 110 blocks the visible light beam. Of course, the transmittance of the non-transparent region 110 for visible light beams is not limited to less than 10% as long as the internal elements are not visible from the outside of the protective layer 11 through the non-transparent region 110. The non-transparent region 110 effects the blocking of the visible light beam, for example, but not limited to, by absorbing and/or reflecting the visible light beam.

Generally, the area of the display module 12 displaying the image is defined as a display area (not shown), and the area around the display area where the image cannot be displayed is defined as a non-display area (not shown). The transparent area 120 faces the display area, and a vertical projection of the transparent area 120 in the display area is located in the display area or completely coincides with the display area. The non-transparent area 110 covers the non-display area and extends beyond the non-display area in a direction away from the display area. That is, the area of the non-transparent region 110 is larger than the area of the non-display region. When the user uses the optical detection apparatus 1, the display area that the user can actually see on the front surface of the optical detection apparatus 1 is the same size as the transparent area 120.

The emission module 18 is located below the non-transparent area 110. The display module 12 is partially or completely located under the transparent area 120. The emission module 18 and the display module 12 have no overlap or partial overlap in the orthographic projection of the first surface of the protective layer 11. The emission module 18 emits the detection beam 101, and the detection beam 101 may be emitted to the external object 1000 located above the first surface 111 through the non-transparent area 110 of the protective layer 11, and enter the inside of the external object 1000, and then be transmitted out from the external object 1000. Further, the detection beam 101 transmitted from the external object 1000 can be transmitted through the protective layer 11 and at least a portion of the display module 12, and then received by the detection module 19 and converted into an electrical signal corresponding to the optical image information of the biological feature.

The detection beam 101 emitted by the emission module 18 can be emitted to the external object 1000 above the first surface 111 and then transmitted from the external object 1000. In this embodiment, the emitting module 18 includes a first group of light emitting units 181a, a second group of light emitting units 181b, and a third group of light emitting units 181c, and the first group of light emitting units 181a, the second group of light emitting units 181b, and the third group of light emitting units 181c are arranged in a row along a length axis (Y axis) direction of the first surface 111, as shown in fig. 1 and 3.

Referring to fig. 4, the protection layer 11 has a top portion 130 and a bottom portion 140 disposed opposite to each other along a length axis (Y axis), and a first side portion 150 and a second side portion 160 disposed opposite to each other along a width axis (X axis). The third group of light emitting cells 181c is disposed under the non-transparent region 110 of the protective layer 11 corresponding to a center line from the top center to the bottom center of the protective layer 11. The first group of light emitting units 181a and the second group of light emitting units 181b are respectively located at two sides of the third group of light emitting units 181c and below the non-transparent region 110 of the protection layer 11. The first surface 111 has a central axis parallel to the length axis. Orthographic projections of the first, second and third groups of light emitting units 181a, 181b and 181c on the first surface 111 are distributed axisymmetrically with respect to a central axis of the first surface 111 parallel to the length axis.

The external object 1000 has differently oriented sides, for example, but not limited to, the external object 1000 has a first side 1001 oriented toward the first side 150, a second side 1002 oriented toward the second side 160, and a third side 1003 oriented toward the bottom 140. The first light emitting unit 181a emits a first detection light beam 101a, the second light emitting unit 181b emits a second detection light beam 101b, and the third light emitting unit 181c emits a third detection light beam 101 c. The detection beam 101 comprises a first detection beam 101a, a second detection beam 101b and a third detection beam 101 c.

The first detection light beam 101a can exit from the first surface 111 and enter the inside of the external object 1000 from the first side surface 1001. The second detection beam 101b can exit from the first surface 111 and enter the inside of the external object 1000 from the second side 1002. The third detection beam 101c can exit from the first surface 111 and enter the inside of the external object 1000 from the second side 1003. The first detection light beam 101a, the second detection light beam 101b, and the third detection light beam 101c entering the inside of the external object 1000 can enter the protective layer 11 from the bottom surface of the external object 1000. The bottom surface of the external object 1000 is a surface on which the external object 1000 comes into contact with the field of view region V1 of the first surface 111 when biometric detection is performed.

Alternatively, in some embodiments, the field of view region V1 intersects the central axis of the first surface 111 along the length axis, or is disposed near the central axis of the first surface 111 along the length axis. Further, the center of the field of view region V1 may be located on or near the central axis of the first surface 111 in the longitudinal direction.

Optionally, in some embodiments, the optical detection apparatus 1 is applied in an electronic product, the first surface 111 is the outermost surface of the electronic product, and the center of the field of view region V1 may be located on or near a central axis of the first surface 111 along the length direction.

Optionally, in some embodiments, the optical detection apparatus 1 is applied in an electronic product, and the center of the field of view region V1 is spaced from the bottom edge of the electronic product by 5 to 25 mm, or 10 to 20 mm, for example, but not limited to, the center of the field of view region V1 is spaced from the bottom edge of the electronic product by 15 mm. Further optionally, in some embodiments, the emission module 18 and the detection module 19 are both disposed near a bottom edge of the electronic product, the emission module 18 is closer to the bottom edge of the electronic product than the detection module 19, and a center-to-center distance between the detection module 19 and the emission module 18 is 10 mm to 15 mm.

It is understood that the external object 1000 may be a biological object with a biological characteristic, such as, but not limited to, the external object 1000 being a finger, the optical detection device 1 detecting a fingerprint characteristic of the finger. The first side 1001, the second side 1002, the third side 1003, the bottom surface of the external object 1000, etc. cannot be regarded as an ideal smooth plane for the biological object.

Further, when the external object 1000 is a finger, the bottom surface of the external object 1000 has a fingerprint, and when the bottom surface of the external object 1000 contacts the first surface 111, that is, the fingerprint of the finger contacts the first surface 111. In fact, since the fingerprint has ridges and valleys, when the fingerprint is in contact with the first surface 111, the ridges of the fingerprint are directly adjacent to the first surface 111, and there is usually an air space between the valleys of the fingerprint and the first surface 111. The detection light beam 101 can be transmitted from the ridges and valleys of the fingerprint, enter the protective layer 11 by refraction or/and reflection and further pass through the second surface 112 of the protective layer 11 and at least part of the display module 12 is received by the detection module 19.

Alternatively, in some embodiments, the third group of light emitting units 181c may be omitted, and the first detection light beam 101a emitted by the first group of light emitting units 181a can be transmitted to the first side 1001 and the third side 1003 of the external object 1000, and/or the second detection light beam 101b emitted by the second group of light emitting units 181b can be transmitted to the first side 1001 and the third side 1003 of the external object 1000.

At least part of the detection module 19 is located below the display module 12, or at least part of the detection module 19 is located inside the display module 12. The part of the first surface 111 corresponding to the field angle of the detection module 19 is the field area V1 of the detection module 19 on the first surface 111, when biometric detection is performed, the external object 1000 may contact the field area V1, and the detection module 19 can receive the returned detection light beam 101 from the external object 1000, thereby implementing biometric information collection of the external object 1000. Optionally, in some embodiments, the detection module 19 includes an image sensor and a lens, and the detection light beam 101 passes through the lens to adjust the light path and is received by the image sensor. The angle of view of the detection module 19 refers to the angle of view of the lens. It will be appreciated that the lens may comprise or be a short focal lens, a set of lenses, a microlens or an array of microlenses. Further, in some embodiments, the number of the detection modules 19 may be one or more, and when the optical detection apparatus 1 is configured with a plurality of detection modules 19, the plurality of detection modules 19 can be disposed corresponding to different positions of the transparent area 110, so as to receive and image the detection light beam 101 in a wide range.

Referring to fig. 1 to 4, the center of the first group of light emitting units 181a is point a, the center of the second group of light emitting units 181b is point b, the center of the third group of light emitting units 181b is point b, and the center of the field of view region V1 is point d. A distance between a center a of the first group light emitting unit 181a and a center c of the third group light emitting unit 181c is L1, a distance between a center b of the second group light emitting unit 181b and a center c of the third group light emitting unit 181c is L2, a center of an orthogonal projection of the third group light emitting unit 181c on the first surface 111 is c '(not shown), and a distance between centers d and c' of the field of view region V1 is L3. Such as but not limited to: l1 is more than or equal to 5 mm and less than or equal to 25 mm, L2 is more than or equal to 5 mm and less than or equal to 25 mm, and L3 is more than or equal to 5 mm and less than or equal to 25 mm. The spacing distance L1+ L2 between a and b is not greater than 1/2 or 1/3 of the width axis direction length of the first surface 111. The separation distance L3 between c' and d is not greater than 1/3 or 1/2 of the length of the side of the first surface 111 parallel to the length axis direction. Of course, the specific values or ratios of L1, L2, and L3 may be set to any suitable values as needed, and the present application is not limited thereto.

Alternatively, in some embodiments, when the center d of the field of view region V1 is located on the central axis of the first surface 111 parallel to the length axis, the field of view region V1 is axisymmetric with respect to the central axis of the first surface 111 parallel to the length axis.

Optionally, in some embodiments, L1-L2-L3-L10-18 mm. Optionally, in some embodiments, L1 ═ L2 ═ 11.5 mm, and L3 ═ 14 mm.

Optionally, in some embodiments, the center-to-center distance between the first and second groups of light emitting units 181a and 181b is greater than the width of the third side 1003 of the external object 1000. For example, but not limited to, the widths of the first side 1001, the second side 1002, and the third side 1003 of the external object 1000 may be equivalent to a line segment with a length of about 15 mm on the first surface 111, as shown in fig. 1, the field of view region V1 is symmetrical with respect to a central axis of the first surface 111 parallel to the length axis, and then when L1 ≧ L2 ≧ 8 mm, the detection light beam 101a emitted by the first group of light-emitting units 181a can be projected onto the first side 1001, and the detection light beam 101b emitted by the second group of light-emitting units 181b can be projected onto the second side 1002. Thus, the emission module 18 can project the detection beam 101 to the external object 1000 from different angles and directions.

Alternatively, in some embodiments, the distance L1 between the center a of the first group of light emitting cells 181a and the center c of the third group of light emitting cells 181c may be 11.5 mm, and the distance L2 between the center b of the second group of light emitting cells 181b and the center c of the third group of light emitting cells 181c may be 11.5 mm. The distance L4 between the center d of the field of view region V1 and the center c' of the orthographic projection of the third group of light-emitting units 181c on the first surface 111 is 14 mm.

Optionally, in some embodiments, the display module 12 includes a touch panel, or the display device 10 includes a touch panel disposed between the protective layer 11 and the display module 12, and the user can control the display module 12 by touching the first surface 111.

Optionally, in some embodiments, the display module 12 includes a display unit located below the protective layer 11 and a backlight unit located below the display unit. The display unit itself cannot emit light, and the backlight unit supplies a backlight beam of visible light to the display unit, thereby realizing image display. For example, but not limited to, the display module 12 is a liquid crystal display module, the display unit is a liquid crystal display unit, and the display device 10 is a liquid crystal display device.

The housing 13 includes a bottom portion 131 under the display module 12 and a side portion 132 connected to the protective layer 11. The emitter module 18 is attached to the inner wall of the side portion 132 that is attached to the protective layer 11. In this embodiment, the first surface 111 is the outermost surface of the front surface of the optical detection apparatus 1. For an electronic device comprising the optical detection apparatus 1, the first surface 111 is also the outermost surface of the electronic device.

Alternatively, in some embodiments, the portion of the side of the protective layer 11 that is connected to the housing 13 is recessed inward, and the housing 13 is shielded by the protective layer 11 when viewed from the first surface 111 of the protective layer 11. The optical detection device 1 now has a "full screen" effect when viewed from the first surface 111.

Alternatively, in some embodiments, the housing 13 is configured to be able to accommodate various electronic components and the like, and at least a portion of the housing 13 may be made of an electrically conductive material. For example, but not limiting of, the housing 13 may include a sidewall forming an outer surface of the optical detection device 1, and an exposed portion of the optical detection device 1 may be made of a conductive metal. The printed circuit and/or the battery may be housed in the case 13. For example, but not limited to, processors, communication modules, various interfaces, battery management modules, driver circuits, control circuits, etc. may be mounted on a printed circuit board in the form of integrated circuit chips.

Optionally, in some embodiments, the transmitting module 18 further includes a circuit board 182. The first, second and third groups of light emitting units 181a, 181b and 181c are electrically connected to the circuit board 182, and the circuit board 182 provides the first, second and third groups of light emitting units 181a, 181b and 181c with electrical signals, such as, but not limited to, current, voltage, etc., required for light emission. The circuit board 182 is fixedly connected to the inner wall of the side portion 132 of the housing 13, and the first, second, and third groups of light emitting units 181a, 181b, 181c are fixedly connected to the circuit board 182.

Optionally, in some embodiments, the display module 12 is fixedly connected or detachably connected to the bottom 131 and/or the side 132 of the fixing frame 13 by glue, double-sided tape, bolts, snaps, welding, or the like.

Optionally, in some embodiments, a buffer material, such as but not limited to foam, is filled between the display module 12 and the bottom 131 and/or the side 132 of the fixing frame 13.

Optionally, in some embodiments, the transmitting module 18 or the detecting module 19 is fixedly connected or detachably connected with the bottom 131 and/or the side 132 of the fixing frame 13 by glue, double-sided tape, bolts, snaps, welding, or the like.

Referring to fig. 5, the first, second and third groups of light emitting units 181a, 181b and 181c respectively include two light emitting units 188. The first, second, and third groups of light emitting cells 181a, 181b, and 181c are disposed below the bottom of the protective layer 11 and aligned in a row in a width direction (X-axis) of the protective layer, and the spaced distances between centers of adjacent two groups of light emitting cells among the first, second, and third groups of light emitting cells 181a, 181b, and 181c are equal. The spacing between adjacent light emitting cells 188 in each group is equal. The first plane 111 has a central axis along a direction parallel to the length axis, and orthographic projections of the first, second and third groups of light emitting units 181a, 181b, 181c on the first surface 111 are distributed axisymmetrically with respect to the first plane 111 along the central axis parallel to the length axis direction. The two light emitting cells 188 of the first group of light emitting cells 181a are spaced apart by L4 a. The two light emitting cells 188 of the second group of light emitting cells 181b have a center-to-center spacing of L4 b. The two light emitting cells 188 of the third group of light emitting cells 181c have a center-to-center spacing of L4 c. 0< L4a ═ L4b ═ L4c <2 mm. In this embodiment, L1 ═ L2 > L4a ═ L4b ═ L4c, that is, the pitch between adjacent groups of light emitting units is greater than the pitch between adjacent light emitting units 188 in each group of light emitting units.

Alternatively, in some embodiments, for example and without limitation, L4a, L4b, L4c, L4, and L4, are 1.65 mm to 3 mm, the minimum distance between the edges of the first and third groups of light-emitting units 181a and 181c is 6 mm to 20 mm, and the minimum distance between the edges of the second and third groups of light-emitting units 181b and 181c is 6 mm to 20 mm. The light emitting unit 188 itself has a length along the width axis (X-axis) of 1 mm, a length along the length axis (Y-axis) of 0.5 mm, and a length along the thickness axis (Z-axis) of 0.45 mm or 0.5 mm.

Of course, in other or modified embodiments, the first, second and third sets of light emitting units 181a, 181b, 181c may include one or more light emitting units 188. The number of the light emitting units 188 included in the first, second, and third groups of light emitting units 181a, 181b, 181c is not limited in the present application.

In addition, the emitting module 18 may include two, three or more groups of light emitting units, and the number of the light emitting units in each group may be one or more. The plurality of groups of light emitting units of the emitting module 18 may be arranged in a row along the width axis direction, and may also have other arrangements, such as but not limited to: disposed under the non-transparent regions at the four corners of the protective layer 11, or arranged in two rows, etc. This is not a limitation of the present application.

Optionally, in some embodiments, the light emitting units of the plurality of groups are located at the same height in the Z-axis direction.

Alternatively, in some embodiments, the pitch between different groups of light-emitting units (group-to-group center pitch) may be equal or unequal, and the center pitch between the plurality of light-emitting units 188 within the same group of light-emitting units may be equal or unequal. The center-to-center spacing between the plurality of light emitting cells 188 in a certain group of light emitting cells and the center-to-center spacing between the plurality of light emitting cells 188 in another group of light emitting cells may be equal or unequal.

The orthographic projections of the emission module 18 and the display module 12 on the first surface 111 of the protective layer 11 are not overlapped, and the orthographic projection of the emission module 18 on a plane perpendicular to the first surface 111 and the orthographic projection of the display module 12 on the plane are partially or completely overlapped. Alternatively, in some embodiments, the orthographic projections of the emission module 18 and the display module 12 on the first surface 111 of the protective layer 11 may not overlap or partially overlap. Alternatively, in some embodiments, the orthographic projection of the emission module 18 on a plane perpendicular to the first surface 111 and the orthographic projection of the display module 12 on the plane may be partially overlapped or not overlapped.

Optionally, in some embodiments, the minimum distance between the edges of the emission module 18 and the display module 12 is 2 mm to 4 mm, for example, but not limited to, the minimum distance between the edges of the emission module 18 and the display module 12 is 3 mm, so that the detection light beam 101 emitted by the emission module 18 is not blocked by the display module 12.

At least part of the detection module 19 is located below the display module 12. The detection module 19 is fixedly connected with the bottom 131 of the housing 13. For example, but not limited to, the bottom 131 of the housing 13 has a through hole or a recess in which part or all of the detection module 19 is located. The detection module 19 receives the detection beam 101 transmitted by the external object 1000 through the protection layer 11 and the display module 12. Optionally, in some embodiments, at least a portion of the detection module 19 is located inside the display module 12, and the detection module 19 receives the detection light beam 101 transmitted by the external object through the protection layer 11 and at least a portion of the display module 12.

Optionally, in some embodiments, the emission module 18 projects the detection beam 101 to the external object 1000. The detection module 19 may receive the detection beam 101 returned from the external object 1000. The detection beam 101 returned from the external object 1000 includes: the detection beam 101 that enters the inside of the external object 1000 and then is transmitted out of the external object 1000, and/or the detection beam 101 that is reflected by the external object 1000.

Optionally, in some embodiments, the detection module 19 may receive an ambient light beam reflected and/or transmitted by the external object 1000, such as, but not limited to, visible light or invisible light.

Alternatively, in some embodiments, the detection module 19 may receive a light beam emitted by the external object 1000 itself, such as, but not limited to, infrared light of thermal radiation emitted by the external object 1000.

Although the embodiment of the present application illustrates the main imaging principle and the optical path of the detecting module 19 and the emitting module 18, the present application is not limited thereto.

The protective layer 11 may be a single-layer structure, or a multi-layer structure. In this embodiment, the protective layer 11 is a substantially thin plate having a predetermined length, width, and thickness. The protective layer 11 has a length axis corresponding to the Y axis in fig. 1, a width axis corresponding to the X axis in fig. 1, and a thickness axis corresponding to the Z axis in fig. 1.

Alternatively, the protective layer 11 may include a transparent substrate as a main body of the protective layer 11 and optical ink at an edge portion of a lower surface of the transparent substrate, the optical ink being capable of transmitting invisible light and blocking visible light, so that the protective layer 11 may form a transparent region 110 and a non-transparent region 120. For example, but not limited to, the detection beam 101 is near infrared light, the detection beam 101 is transparent to the optical ink and the transparent substrate, and visible light is not transparent to the optical ink. Further alternatively, the transparent substrate may be glass, resin, plastic or any transparent substance.

The optical ink may be an infrared ink, which is capable of transmitting near infrared light and blocking visible light. The near infrared light may be a light beam having a wavelength of 750nm (nanometers) to 2000 nm. For example, but not limited to, in the embodiment of the present application, the detection beam 101 is near infrared light with a wavelength of 800nm to 1200 nm. The near infrared light is used as the detection light beam 101 to collect the biological characteristic information of the external object 1000 in an optical imaging mode, and the influence of visible light from the display module 12 or the environment can be avoided, and the normal image display of the display module 12 can not be influenced.

Since the emitting module 18 can project the detection beam 101 to the side of the external object 1000 with different directions, the detection beam 101 can enter the inside of the external object 1000 and transmit, and then can be received by the detecting module 19 and used for generating the biometric image of the external object 1000.

Referring to fig. 6A, the light emitting angle of the light emitting unit 188 in the plane of the width axis (X axis) and the thickness axis (Z axis) of the protective layer 11 is α, referring to fig. 6B, the light emitting angle of the light emitting unit 188 in the plane of the length axis (Y axis) and the thickness axis (Z axis) of the protective layer 11 is β, in this embodiment, 0 ° < α ° < β ≦ 145 °. for example, but not limited to, 100 ° ≦ α ≦ β ≦ 140 °.

The light emitting unit 188 has a light emitting surface (not numbered) parallel to the first surface 111 of the protective layer 11; or the light-emitting surface and the first surface 111 form an included angle, and the light-emitting surface faces the field area of the first surface 111 and is relatively inclined with respect to the first surface 111. The protective layer 11 has a second surface 112 opposite to the first surface 111, and the center of the light-emitting surface is spaced from the second surface 112 of the protective layer 11 by a predetermined distance. Illustratively, the predetermined distance is 0 to 1 mm, or 1 mm to 3 mm.

For example, but not limited to, the center of the light emitting surface and the second surface 112 are spaced by 0.4 mm to 0.5 mm, the light emitting surface of the light emitting unit 188 may be a rectangle with 1 mm × 0.5 mm, the minimum distance between the edge of the light emitting unit 188 and the edge of the display module 12 is 3 mm, the light emitting angle of the light emitting unit 188 is approximately 140 °, and the light emitting range of the light emitting unit 188 is not blocked by the display module 12. The detection light beam 101 emitted by the light emitting unit 188 can enter the protective layer 11 from the second surface 112 without being blocked. Of course, the preset distance may be other values meeting the requirement, and the application does not limit this.

Optionally, in some embodiments, a light converter is disposed between the light emitting surface of the light emitting unit 188 and the second surface 112 of the non-transparent region 120.

Referring to fig. 7, which is a schematic diagram of a further embodiment of the optical detection apparatus 1, the display apparatus 10 further includes a light converter 14. The light converter 14 is located below the non-transparent region 110, attached to the second surface 112, and located between the light emitting surface of the light emitting unit 188 and the second surface 112. The light-emitting surface of the light-emitting unit 188 and the light converter 14 are spaced by air.

The light converter 14 is configured to deflect the detection light beam 101 emitted by the emitting unit 188 towards the view field region V1, so that the incident angle of the detection light beam 101 entering the protection layer 11 becomes larger, and the detection light beam 101 can be emitted from a position closer to the central region of the first surface 111 to the inside of the external object 1000 located above the first surface 111, so that when the emitting module 18 and the light emitting unit 188 are located below the bottom 140 and the non-transparent region 110 of the protection layer 11, the view field region V1 can have a larger distance from the bottom 140, that is, the external object 1000 can contact the view field region V1 close to the central position of the first surface 111 when performing detection. And the field area V1 is an area where the first surface 111 is located within the field angle range of the detection module 19, so by providing the optical converter 14, the distance between the emission module 18 and the detection module 19 in the length axis direction of the protective layer 11 is increased. The external object 1000 is, for example and without limitation, a finger, and when performing fingerprint feature detection on the finger, the finger may contact the field of view region V1 closer to the center of the first surface 111 to achieve collection of optical fingerprint feature information. Optionally, in some embodiments, the light converter 14 may be one or more combinations of prisms, lenses, prisms, spherical stages, optical multilayer films, optical diffraction elements, gratings, diaphragms, optical microstructures, and the like. For example, but not limiting of, the light converter 14 may be partially a grating and partially an optical microstructure. Alternatively, in some embodiments, the light converter 14 may also be omitted or integrated within the protective layer 11. Optionally, in some embodiments, the light converter 14 is integrally formed with the protective layer 11. Alternatively, the first surface 111 has a central axis parallel to the length axis, and the orthographic projection of the light converter 14 on the first surface 111 intersects the central axis. The light converter 14 has a rectangular shape with a width and length in the range of 1 mm to 3 mm. Alternatively, the light converter 17 may have any other shape that meets the product requirement, such as, but not limited to, a circle, an ellipse, a rectangle with rounded corners, etc., which is not limited by the present invention.

Please refer to fig. 8, which is a schematic diagram of an alternative embodiment of the optical detection apparatus 1, and for convenience of description, names and reference numerals of elements in fig. 8 are the same as those in fig. 1 to 3. The emitting module 18 includes a light emitting unit 188, and the light emitting unit 188 has a light emitting surface 1881 for emitting the detection light beam 101. The light emitting surface 1881 is an inclined surface forming a predetermined angle with the second surface 112. The light emitting surface 1881 and the second surface 112 are spaced apart from each other by air and are disposed obliquely to each other. For example, but not limited to, the predetermined angle formed by the light exit surface 1881 of the light emitting unit 188 and the second surface 112 is an acute angle. The light emitting unit 188 can be fixedly attached to the side portion 132 of the housing 13 by the optical ramp 185. By configuring the light emitting unit 188 to have a predetermined angle with the second surface 112, the incident angle of the detection light beam 101 emitted by the light emitting unit 188 or the emission module 18 entering the protection layer 11 can have a larger value range, and the detection light beam 101 can more easily enter the external object 1000 when exiting from the first surface 111.

It should be noted that, in the embodiment of the present application, one detection module 19 is taken as an example for description, and accordingly, the number of the field areas V1 of the detection module 19 on the first surface 111 of the protection layer 11 is 1. The field of view region V1 is located at least partially within the transparent region 120. The area of the field-of-view region V1 is smaller than the surface area of the upper surface of the transparent region 120. The field of view region V1 is adjacent to or remote from the non-transparent region 110. Alternatively, in some embodiments, the number of the detection modules 19 may be multiple or the detection modules 19 may include multiple receiving units having multiple field-of-view regions V1 on the second surface 112, so that the sensing area of the biometric features may be enlarged. Even more, the plurality of field regions V1 may extend over the upper surface of the entire transparent area 120. Thereby, full screen biometric sensing is achieved.

In this embodiment, the first surface 111 is an upper surface of the protection layer 11, the second surface 112 is a lower surface of the protection layer 11, and the first surface 111 and the second surface 112 are disposed oppositely. Alternatively, in other or modified embodiments, the second surface 112 may be a bevel or a side surface of the protective layer 11. The side of the protective layer 11 may be a plane or a curved surface.

The optical detection device 1 can be used to detect biometric information of the external object 1000, generate an image of the external object 1000, detect the position of the external object, determine whether the external object is a living object, and the like. In this embodiment, taking fingerprint detection as an example, a part or all of the field-of-view area V1 is a touch area of the user's finger on the first surface 111 during fingerprint detection. The first surface 111 of the protective layer 11 is a surface that is directly contacted by the finger 1000 of the user during fingerprint detection, and is usually the outermost surface of the optical detection device 1 or an electronic product comprising the optical detection device 1. The detection light beam 101 can exit from the first surface 111 and enter the inside of the finger from the side of the finger having a different orientation. When the finger touches the field of view region V1 or is located above the field of view region V1, the detection light beam 101 entering the inside of the finger is transmitted out through the ridges of the fingerprint and the valleys of the fingerprint and further transmitted through the protective layer 11 and at least part of the display module 12 to be received by the detection module 19. Since the detection beams 101 transmitted from the ridges and valleys of the fingerprint have different refractive indexes when entering the protective layer 11, the detection beams 101 transmitted from the ridges and valleys of the fingerprint received by the detection module 19 have different beam intensities. Different intensities of the detection beam 101 can be used to generate optical images corresponding to fingerprints having different light and dark contrasts.

Alternatively, in some embodiments, the width (along the Y-axis) of the light emitting unit 188 is 0.5 mm, and the light emitting unit 188 is a top-emission type light emitting element. Illustratively, the size of the light emitting cell 188 is 1 mm by 0.5 mm by 1 mm. Alternatively, in some embodiments, the light emitting unit 188 may be a side light emitting type light emitting element.

Optionally, in some embodiments, the emission module 18 may further include a circuit board 182, the circuit board 182 is a flexible circuit board, the circuit board is electrically connected to the light emitting unit 181, and the circuit board 182 may be fixedly connected or detachably connected to the side portion 132 and/or the bottom portion 131 of the fixing frame 13 through glue, double-sided tape, adhesive, bolts, brackets, snaps, slots, welds.

Alternatively, the shape of the field region V1 may be square, circular, oval, etc., which is not limited in the embodiment of the present invention. Optionally, the field of view region V1 is circular with a radius in the range of 2 to 5 mm, or 3 to 4 mm, or 3 to 5 mm. When the range of the field-of-view region V1 is large, the region in which the external object 1000 can come into contact with the first surface 111 to acquire biometric information when biometric detection is performed is large.

Optionally, the light emitting unit 188 is, for example, but not limited to, one or more of an LED (light emitting diode), an LD (laser diode), a VCSEL (vertical cavity surface emitting laser), a Mini-LED, a Micro-LED, an OLED (organic light emitting diode), a QLED (quality dot light emitting diode), or a light emitting array including one or more of an LED, an LD, a VCSEL, a Mini-LED, a Micro-LED, an OLED, and a QLED.

The embodiment of the utility model provides a detection module 19 receives can receive outside finger 1000 return detection beam 101 and be used for fingerprint detection, the detection beam 101 that returns via finger 1000 includes but is not limited to: the detection beam 101 is diffusely reflected at the ridges of the fingerprint, and/or the detection beam 101 is transmitted by the finger 1000 after entering the inside of the finger 1000, and/or the detection beam 101 is reflected at the surface of the finger 1000.

Compared with the prior art, in the embodiments and the modified embodiments of the present application, the emission module 18 is configured such that the emission module 18 can project the detection light beams 101 onto the side surfaces of the external object 1000 with different orientations, while the prior art can generally project the detection light beams 101 onto only one side surface of the external object 1000, that is, the embodiments of the present application can project the detection light beams 101 onto the external object 1000 from various directions or multiple angles, while the prior art projects the detection light beams from a single direction. When the biological characteristics are detected, when the detection light beam 101 and the biological characteristics of the external object 1000 are at different angles, the biological characteristic image generated based on the detection light beam 101 returned by the external object 1000 received by the detection module 19 also has different imaging definition. Therefore, when the biometric detection is performed by optical imaging of the external object 1000, the detection beam projected in a single direction cannot ensure the quality of the optical imaging, and projecting the detection beam 101 to the external object 1000 from multiple directions and angles can greatly improve the efficiency and accuracy of biometric detection.

The optical detection device 1 of the present application can project onto three different sides of the external object 1000, for example, when performing biometric detection on the external object 1000. Therefore, the angle and the light quantity of the detection light beam 101 received by the external object 1000 are large, so that the detection module 19 has a good imaging effect when receiving the detection light beam 101 transmitted by the external object 1000, and the biological feature detection efficiency and accuracy are improved.

In addition, three groups of light-emitting units are arranged to respectively correspond to three different sides of an external object, and the three groups of light-emitting units are arranged at proper intervals, so that the requirement on the angle of the detection light beam 101 during biological characteristic detection can be met, energy consumption can be saved, heat emission can be reduced, and the utilization rate of the detection light beam 101 can be improved.

It should be noted that the detection module 19 receives the refracted detection beam 101 from the ridges and valleys and is used for optical imaging of the fingerprint. However, the present invention is not limited thereto, and the detecting module 19 may receive other light beams with fingerprint feature information for imaging or detecting. For example, but not limiting of, the detection module 19 may receive the detection beam 101 directly reflected from the surface of the user's finger (including the ridges and/or valleys of the fingerprint) and used for fingerprint detection; for example, but not limiting of, the detection module 19 receives the detection beam 101 diffusely reflected at the ridge and used for optical imaging of the fingerprint; for example, but not limited to, the detection module 19 may receive visible light and/or invisible light in the external environment reflected by the user's finger and be used for fingerprint detection; for example, but not limited to, the detection module 19 may receive visible light and/or invisible light in an external environment transmitted by a user's finger and be used for fingerprint detection; for example, but not limited to, the detection module 19 may receive visible light and/or invisible light emitted by a user's finger and be used for fingerprint detection. Further, the fingerprint detection may be performed for other detection objects, and the characteristic information of the detection object may be obtained by an optical imaging method. Therefore, although the embodiment of the present invention is described by taking the detection beam 101 for receiving diffuse reflection as an example, other possible beams for optical imaging of fingerprints also belong to the protection scope of the present invention.

In this application, the optical detection device 1 may be a mobile phone, a tablet computer, an intelligent watch, an augmented reality/virtual reality device, a human body motion detection device, an auto-driven automobile, an intelligent home device, a security device, a medical device, an intelligent robot, or the like, or an assembly of the above.

The utility model discloses an above-mentioned embodiment or change embodiment and corresponding change set up in about leaded light unit, display module assembly, transmission module assembly, detection module assembly, light converter, luminescence unit, the regional structure, the position that etc. of visual field also can use the utility model discloses an in other embodiments, obtain embodiment and replacement, deformation, combination, split, extension from this, omit etc. and all belong to the utility model discloses protection scope.

It should be noted that, the utility model discloses go out plain noodles, income plain noodles etc. that probably appear in the description, can be the entity surface of actual existence, also can be the hypothetical surface, do not influence the utility model discloses technical scheme realizes, all belongs to the utility model discloses the scope. In addition, "overlap", "coincidence", "overlap", which may appear in the description of the present invention, are to be understood as having the same meaning and to be interchangeable.

It should be noted that, those skilled in the art can understand that, without creative efforts, some or all of the embodiments of the present invention, and some or all of the deformation, replacement, alteration, split, combination, extension, etc. of the embodiments should be considered as covered by the inventive idea of the present invention, and belong to the protection scope of the present invention.

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 invention. 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 in the specification of "length", "width", "upper", "lower", "left", "right", "front", "rear", "back", "front", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., which may appear in the present invention, are orientations or positional relationships indicated on the basis of the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. 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 invention, 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 invention, "plurality" or "a plurality" means at least two or two unless specifically defined otherwise. In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, "disposed," "mounted" or "connected" is to be understood in a broad sense, and may be, for example, 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 invention can be understood in specific cases to those skilled in the art.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. 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 invention shall be subject to the protection scope of the claims.

Claims (15)

1. An optical detection apparatus capable of actively emitting light onto an external object and realizing biometric detection by receiving return light of the external object, comprising:

the liquid crystal display device comprises a liquid crystal display module and a protective layer, wherein the protective layer is positioned above the liquid crystal display module and is provided with a first surface which is contacted by an external object to realize interaction or biological characteristic detection, the liquid crystal display module comprises a liquid crystal display unit and a backlight unit, the backlight unit is used for providing a backlight beam of visible light for the liquid crystal display unit, the backlight beam can be emitted to the outside through the liquid crystal display unit and the protective layer to realize image display, the first surface of the protective layer is provided with a length axis and a width axis which are vertical to each other, and the protective layer is provided with a top part and a bottom part which are oppositely arranged along the length axis direction;

the emission module is positioned below the first surface, vertical projections of the emission module and the liquid crystal display module on the first surface are not overlapped or partially overlapped, the emission module comprises three groups of light-emitting units, the intervals between the adjacent groups are equal, the three groups of light-emitting units are arranged below the bottom of the protective layer and are arranged in a row along the direction parallel to the width axis, the first plane is provided with a central axis along the direction parallel to the length axis, the orthogonal projections of the first group, the second group and the third group of light-emitting units on the first plane are distributed in an axial symmetry mode relative to the first plane along the central axis parallel to the length axis, the three groups of light-emitting units can emit detection light beams of near infrared light, and the detection light beams can be projected onto side surfaces of external objects with different orientations through the protective layer; and

the detection module is at least partially positioned below the liquid crystal display module or inside the liquid crystal display module, the detection light beam returned from the external object can penetrate through the protective layer and at least part of the liquid crystal display module to be received by the detection module, and the detection module converts the received detection light beam into a corresponding electric signal to acquire the biological characteristic information of the external object.

2. The optical detection device according to claim 1, wherein each group of the light emitting units includes two light emitting units, and the center-to-center distances between the adjacent light emitting units in each group are equal, and the center-to-center distances between the adjacent groups are different from the distances between the adjacent light emitting units in each group; or, at least one group of light-emitting units comprises no less than two light-emitting units, and the center distance between adjacent light-emitting units in the group of light-emitting units is smaller than that between adjacent groups of light-emitting units.

3. The optical inspection device of claim 1 wherein the length of the emission module in a direction parallel to the width axis is not less than the length of an external object in a direction parallel to the protective layer width axis.

4. The optical inspection device of claim 1 wherein the differently oriented sides of the external object include a first side, a second side, and a third side, the three groups of light-emitting units of the emission module are respectively a first group of light-emitting units, a second group of light-emitting units and a third group of light-emitting units, the first set of light emitting units for projecting a detection light beam towards a first side of the external object, the second set of light emitting units for projecting a detection light beam towards a second side of the external object, the third group of light emitting units is used for projecting detection beams to a third side surface of an external object, the protective layer is provided with a first side part and a second side part which are oppositely arranged along the width axis direction, the first side faces the first side, the second side faces the second side, and the third side faces the bottom or top.

5. The optical inspection device of claim 4, wherein the inspection beam can enter the interior of the external object from the first side, the second side, and the third side, and the inspection beam entering the interior of the external object can exit the bottom surface of the external object and penetrate the protection layer to be received by the inspection module.

6. The optical inspection device of claim 5, wherein the external object is a finger, the bottom surface of the finger includes a fingerprint, and the fingerprint is in contact with a field area of the inspection module on the first surface during the inspection, and the field area is a portion of the first surface within a field angle range of the inspection module.

7. The optical inspection device of claim 1, wherein the three groups of light-emitting units of the emission module are a first group of light-emitting units, a second group of light-emitting units, and a third group of light-emitting units, respectively, the first surface has a central axis parallel to the length axis, an orthographic projection of the third group of light-emitting units on the first surface intersects the central axis of the first surface parallel to the length axis, the first group of light-emitting units and the second group of light-emitting units are located on two sides of the third group of light-emitting units, a distance from a center of the first group of light-emitting units to a center of the third group of light-emitting units is L1, a distance from a center of the second group of light-emitting units to a center of the third group of light-emitting units is L2, a portion of the first surface located in a field angle range of the inspection module is a field area, and a distance from a center of the field area to a center of the orthographic projection of the, the field area is a part of the first surface, which is located in a field angle range of the detection module, wherein L1 is 8 mm to 21 mm equal to L2, and L3 is 10 mm to 18 mm.

8. The optical inspection device according to claim 1, wherein the three groups of light-emitting units respectively include two light-emitting units, the two light-emitting units of the same group of light-emitting units are spaced apart from each other by a distance of 1.65 mm to 3 mm, and the minimum distance between the edges of the adjacent groups of light-emitting units is 6 mm to 20 mm.

9. The optical inspection device of claim 6 wherein the diameter of the field of view region ranges from 7 mm to 10 mm.

10. The optical inspection device as claimed in claim 1, wherein the liquid crystal display device further comprises a housing for receiving and supporting the liquid crystal display module and the protection layer, the housing comprises a bottom portion located below the liquid crystal display module and a side portion connected to the protection layer, and the emission module is fixedly connected to the side portion.

11. The optical inspection device as claimed in claim 10, wherein the light-emitting unit has a bottom surface connected to the side portion and a light-emitting surface for emitting the inspection beam, the light-emitting surface is a side surface of the light-emitting unit, the light-emitting unit is a side-emitting light-emitting device, and the light-emitting surface is parallel to the first surface or disposed at an acute angle thereto.

12. The optical inspection device of claim 1, wherein the protective layer has a transparent region and a non-transparent region surrounding the transparent region, the bottom and top of the protective layer are located in the non-transparent region, the transparent region is capable of transmitting visible light and inspection light beams, the non-transparent region is capable of blocking visible light and transmitting inspection light beams, the predetermined region is at least partially located in the non-transparent region, the field of view region is at least partially located in the transparent region, the LCD module is partially or completely located below the transparent region, the emission module is located below the non-transparent region, the inspection module is partially or completely located below the LCD module, the LCD module is capable of transmitting the inspection light beams, the LCD module is capable of emitting visible light through the transparent region, the detection module can receive the detection light beam returned by the external object through at least part of the liquid crystal display module.

13. The optical inspection device of claim 1 wherein the inspection beam returned by the external object comprises: the detection beam reflected and/or transmitted by the external object.

14. The optical inspection device as claimed in claim 2, wherein the light emitting unit has a light emitting surface, the protection layer has a second surface opposite to the first surface, and a center of the light emitting surface and the second surface of the protection layer are spaced apart by a predetermined distance, and the predetermined distance is 0 to 1 mm, or 1 mm to 3 mm.

15. The optical inspection device according to claim 2, wherein the light emitting unit has a light emitting angle of 140 degrees in a length axis direction of the first surface and a light emitting angle of 140 degrees in a width axis direction of the first surface.

Images