Optical detection device

Abstract

The present invention discloses an optical detection device, including a display device, which includes a display module and a protective layer, the protective layer is located above the display module, the display module can emit visible light through the protective layer to realize image display, and the protective layer has a first surface for external objects to contact to realize interaction or biometric detection; an emission module, located below the protective layer, the vertical projections of the emission module and the display module on the first surface do not overlap or partially overlap, the emission module is used to emit a detection beam, the detection beam can be projected through the protective layer to the side of the external object with different orientations; a detection module, the detection beam returned from the external object can be received by the detection module through the protective layer and the display screen, and the detection module converts the received detection beam into a corresponding electrical signal to obtain the biometric information of the external object. The present invention can achieve a better fingerprint detection effect under the screen.

Description

Technical Field

[0001] The present invention relates to the field of optoelectronic technology, and in particular to an optical detection device for realizing fingerprint detection or other detection by using optical imaging. Background Art

[0002] With the advancement of technology and the improvement of people's living standards, users require more functions and fashionable appearance for electronic products such as mobile phones, tablets, and cameras. At present, the development trend of electronic products such as mobile phones is to have a high screen-to-body ratio and functions such as fingerprint detection. In order to achieve a full-screen or near-full-screen effect and make electronic products have a high screen-to-body ratio, under-screen fingerprint detection technology has emerged. However, for non-self-luminous displays such as LCD screens, the existing technology does not have a suitable under-screen detection solution. Summary of the invention

[0003] In view of this, the present invention provides an optical detection device that can solve the problems of the prior art.

[0004] One aspect of the present invention provides an optical detection device, which can actively emit light to an external object and realize biometric detection by receiving return light from the external object, including: a liquid crystal display device, which includes a liquid crystal display module and a protective layer, the protective layer is located above the liquid crystal display module, the protective layer has a first surface for external objects to contact to realize interaction or biometric detection, the liquid crystal display module includes a liquid crystal display unit and a backlight unit, the backlight unit is used to provide a backlight beam of visible light to 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, wherein the first surface of the protective layer has a length axis and a width axis perpendicular to each other, and the protective layer has a top and a bottom arranged relatively along the length axis direction; an emission module, located below the first surface, the vertical projections of the emission module and the liquid crystal display module on the first surface do not overlap or partially overlap. The transmitting module comprises three groups of light emitting units, and the spacing between adjacent groups is 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 has a central axis along the direction parallel to the length axis. The positive projections of the first group, the second group and the third group of light emitting units on the first plane are axially symmetrical about the central axis of the first plane along the direction parallel to the length axis. The three groups of light emitting units can emit detection beams of near-infrared light, and the detection beams can pass through the protective layer and be projected onto the sides of the external object with different orientations; and a detection module, which is at least partially located below the liquid crystal display module or inside the liquid crystal display module, and the detection beam returned from the external object can pass 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 beams into corresponding electrical signals to obtain biometric information of the external object.

[0005] In some embodiments, each group of light-emitting units includes two light-emitting units, and the center spacing between adjacent light-emitting units in each group is equal, and the center spacing between adjacent groups is different from the spacing between adjacent light-emitting units in each group; or, at least one group of light-emitting units includes not less than two light-emitting units, and the center spacing between adjacent light-emitting units in the group of light-emitting units is smaller than the center spacing between light-emitting units in adjacent groups.

[0006] In some embodiments, the length of the emission module in a direction parallel to the width axis is not less than the length of the external object in a direction parallel to the width axis of the protective layer.

[0007] In some embodiments, the sides of the external object with different orientations 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 group of light-emitting units is used to project a detection beam to the first side of the external object, the second group of light-emitting units is used to project a detection beam to the second side of the external object, and the third group of light-emitting units is used to project a detection beam to the third side of the external object. The protective layer has a first side portion and a second side portion that are relatively arranged along the width axis direction, the first side portion faces the first side portion, the second side portion faces the second side portion, and the third side portion faces the bottom or the top.

[0008] In some embodiments, the detection light beam can enter the interior of the external object from the first side, the second side and the third side. The detection light beam entering the external object can be emitted from the bottom surface of the external object and penetrate the protective layer before being received by the detection module.

[0009] In some embodiments, the external object is a finger, the bottom surface of the finger includes a fingerprint, and during detection, the fingerprint contacts the field of view area of ​​the detection module on the first surface, and the field of view area is the portion of the first surface within the field of view angle range of the detection module.

[0010] In certain 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. The orthographic projection of the third group of light-emitting units on the first surface intersects with 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 both sides of the third group of light-emitting units. The spacing distance from the center of the first group of light-emitting units to the center of the third group of light-emitting units is L1, and the spacing distance from the center of the second group of light-emitting units to the center of the third group of light-emitting units is L2. The portion of the first surface located within the field of view angle range of the detection module is the field of view area. The spacing distance between the center of the field of view area and the center of the orthographic projection of the third group of light-emitting units on the first surface is L3. The field of view area is the portion of the first surface located within the field of view angle range of the detection module. L1=L2=8 mm to 21 mm, L3=10 mm to 18 mm.

[0011] In some embodiments, the three groups of light emitting units respectively include two light emitting units, the center distance between two light emitting units in the same group of light emitting units is 1.65 mm to 3 mm, and the minimum edge distance between adjacent groups of light emitting units is 6 mm to 20 mm.

[0012] In some embodiments, the diameter of the field of view area ranges from 7 mm to 10 mm.

[0013] In some embodiments, the liquid crystal display device also includes a shell, which is used to accommodate and support the liquid crystal display module and the protective layer. The shell includes a bottom located below the liquid crystal display module and a side connected to the protective layer, and the emission module is fixedly connected to the side.

[0014] In some embodiments, the light emitting unit has a bottom surface connected to the side portion and a light emitting surface for emitting a detection light beam, the light emitting surface is a side surface of the light emitting unit, the light emitting unit is a side-emitting light emitting element, and the light emitting surface is parallel to or at an acute angle to the first surface.

[0015] In certain embodiments, the protective layer has a transparent area and a non-transparent area located around the transparent area, the bottom and top of the protective layer are located in the non-transparent area, the transparent area is capable of transmitting visible light and detection light beams, the non-transparent area is capable of blocking visible light and transmitting detection light beams, the preset area is at least partially located in the non-transparent area, the field of view area is at least partially located in the transparent area, the liquid crystal display module is partially or completely located below the transparent area, the emission module is located below the non-transparent area, the detection module is partially or completely located below the liquid crystal display module, the liquid crystal display module is capable of transmitting the detection light beam, the liquid crystal display module is capable of emitting visible light through the transparent area, and the detection module is capable of receiving the detection light beam returned by an external object through at least part of the liquid crystal display module.

[0016] In some embodiments, the detection light beam returned by the external object includes: the detection light beam reflected and / or transmitted by the external object.

[0017] In some embodiments, the light emitting unit has a light emitting surface, the protective layer has a second surface opposite to the first surface, the center of the light emitting surface and the second surface of the protective layer are spaced a preset distance apart, and the preset distance is 0 to 1 mm, or 1 mm to 3 mm.

[0018] In some embodiments, the light emitting unit has a light emitting angle of 140 degrees along the length axis direction of the first surface and a light emitting angle of 140 degrees along the width axis direction of the first surface.

[0019] In some embodiments, the external object includes fingers, palms, toes, and skin, and the detection light beam is used to detect fingerprints, palm prints, and toe features.

[0020] 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, a smart home device, a security device, an intelligent robot, or a component thereof.

[0021] The beneficial effect of the present invention lies in that, compared with the prior art, in the embodiments and modified embodiments of the present application, by configuring the transmitting module, the transmitting module can project the detection light beam onto the sides of the external object with different orientations. In this way, the external object receives the detection light beam at a greater angle and in greater amounts of light, and the detection module receives the detection light beam transmitted by the external object with better imaging effect, thereby improving the efficiency and accuracy of biometric detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of an embodiment of an optical detection device of the present invention;

[0023] Figure 2 yes Figure 1 A partial cross-sectional view of the optical detection device shown;

[0024] Figure 3 yes Figure 1 A partial cross-sectional view of the optical detection device shown;

[0025] Figure 4 yes Figure 1 A schematic diagram of the optical detection device shown;

[0026] Figure 5 yes Figure 3 A schematic diagram of the optical detection device shown;

[0027] Fig. 6A and Figure 6B It is a partial schematic diagram of the light-emitting unit of the emission module;

[0028] Figure 7 is a partial cross-sectional view of an embodiment of an optical detection device of the present invention;

[0029] Figure 8 It is a partial cross-sectional view of an embodiment of the optical detection device of the present invention. DETAILED DESCRIPTION

[0030] In the specific description of the embodiments of the present invention, it should be understood that when a substrate, sheet, layer or pattern is referred to as being "on" or "under" another substrate, another sheet, another layer or another pattern, it may be "directly" or "indirectly" on another substrate, another sheet, another layer or another pattern, or one or more intermediate layers may also exist. For the purpose of clarity, the thickness and size of each layer in the drawings of the specification may be exaggerated, omitted or schematically indicated. In addition, the size of the elements in the drawings does not fully reflect the actual size.

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Further, the described features and structures may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided so that the embodiments of the present application can be fully understood. However, those skilled in the art will appreciate that, even without one or more of the specific details, or by adopting other structures, components, etc., the technical scheme of the present application may also be put into practice. In other cases, known structures or operations are not shown or described in detail to avoid blurring the key points of the present application.

[0033] Please also see Figures 1 to 3 , Figure 1 is a schematic front plan view of an embodiment of the optical detection device 1 of the present invention, Figure 2 Shows Figure 1 Partial view of the optical detection device 1 along line AA. Figure 3 Shows Figure 1 Partial view of the optical detection device 1 along line BB. Figures 1 to 3 In the three-axis orthogonal coordinate system, the “X-axis” 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 .

[0034] 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 can be configured to be located inside the display device 10. 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 protective layer 11. The emission module 18 and the display module 12 are arranged side by side below the protective layer 11.

[0035] The protective layer 11 may include a first surface 111 facing upward (Z-axis positive direction, Z+). The first surface 111 is used for contact with the external object 1000 to interact or collect biometric information of the external object 1000. The protective layer 11 has a transparent area 120 and a non-transparent area 110, such as Figure 1As shown, the non-transparent area 110 is located around the transparent area 120. The transparent area 120 can transmit visible light from the display module 12, and the user can receive the visible light emitted from the transparent area 120 by the display module 12 through the first surface 111, so as to "see" the information displayed by the display module 12. The first surface 111 is roughly rectangular, and has a length axis (Y axis) and a width axis (X axis) that are perpendicular to each other. Optionally, in some embodiments, the corners of the first surface 111 can be arc-shaped. The protective layer 11 further includes a second surface 112 opposite to the first surface 111. In this embodiment, the first surface 111 is the upper surface of the protective layer 11, and the second surface 112 is the lower surface of the protective layer 11, and the first surface 111 and the second surface 112 are arranged opposite to each other. Optionally, in other or modified embodiments, the second surface 112 can be an inclined surface or a side surface of the protective layer 11. The side surface of the protective layer 11 can be a plane or a curved surface.

[0036] The non-transparent area 110 is used to transmit the detection beam 101 and block the visible beam. In an embodiment of the present application, the transmittance of the non-transparent area 110 to the detection beam 101 is greater than 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, or 90%. When the transmittance of the non-transparent area 110 to the detection beam 101 is greater, the intensity of the detection beam 101 after penetrating the protective layer 11 is greater.

[0037] In addition, the non-transparent area 110 blocks the visible light beam, which means that the transmittance of the non-transparent area 110 to the visible light beam is less than 10%, 5%, or 1%, or even the transmittance of the non-transparent area 110 to the visible light beam is 0. The smaller the transmittance of the non-transparent area 110 to the visible light beam is, the more the non-transparent area 110 blocks the visible light beam. Of course, the transmittance of the non-transparent area 110 to the visible light beam is not limited to less than 10%, as long as the internal components cannot be seen from the outside of the protective layer 11 through the non-transparent area 110. The non-transparent area 110 blocks the visible light beam, for example, but not limited to, by absorbing and / or reflecting the visible light beam.

[0038] Typically, the area where the display module 12 displays an image is defined as a display area (not marked), and the area around the display area where the image cannot be displayed is a non-display area (not marked). The transparent area 120 is opposite to the display area, and the vertical projection of the transparent area 120 in the display area is located in the display area or completely overlaps with the display area. The non-transparent area 110 covers the non-display area and exceeds the non-display area in a direction away from the display area. That is, the area of ​​the non-transparent area 110 is larger than the area of ​​the non-display area. When a user uses the optical detection device 1, the display area that the user can actually see on the front of the optical detection device 1 is the same size as the transparent area 120.

[0039] The emission module 18 is located below the non-transparent area 110. The display module 12 is partially or completely located below the transparent area 120. The orthographic projections of the emission module 18 and the display module 12 on the first surface of the protective layer 11 are non-overlapping or partially overlapping. The emission module 18 emits a detection light beam 101, which can be emitted through the non-transparent area 110 of the protective layer 11 to the external object 1000 located above the first surface 111, enter the interior of the external object 1000, and then be transmitted from the external object 1000. Furthermore, the detection light beam 101 transmitted from the external object 1000 can be received by the detection module 19 after passing through the protective layer 11 and at least part of the display module 12, and converted into an electrical signal of optical image information corresponding to the biometric feature.

[0040] The detection light 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 emission 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. 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 the length axis (Y axis) direction of the first surface 111, as shown in FIG. Figure 1 , Figure 3 shown.

[0041] See also Figure 4The protective layer 11 has a top 130 and a bottom 140 that are relatively arranged along the length axis (Y axis), and a first side portion 150 and a second side portion 160 that are relatively arranged along the width axis (X axis). The third group of light-emitting units 181c is arranged below the non-transparent area 110 of the protective layer 11 corresponding to the midline 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 on both sides of the third group of light-emitting units 181c and below the non-transparent area 110 of the protective layer 11. The first surface 111 has a central axis parallel to the length axis. The orthographic projections of 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 on the first surface 111 are axially symmetrically distributed about the central axis of the first surface 111 that is parallel to the length axis.

[0042] The external object 1000 has different sides, for example but not limited to, the external object 1000 has a first side 1001 facing the first side portion 150, a second side 1002 facing the second side portion 160, and a third side 1003 facing the bottom 140. The first light emitting unit 181a emits a first detection beam 101a, the second light emitting unit 181b emits a second detection beam 101b, and the third light emitting unit 181c emits a third detection beam 101c. The detection beam 101 includes the first detection beam 101a, the second detection beam 101b, and the third detection beam 101c.

[0043] The first detection beam 101a can be emitted from the first surface 111 and enter the interior of the external object 1000 from the first side surface 1001. The second detection beam 101b can be emitted from the first surface 111 and enter the interior of the external object 1000 from the second side surface 1002. The third detection beam 101c can be emitted from the first surface 111 and enter the interior of the external object 1000 from the second side surface 1003. The first detection beam 101a, the second detection beam 101b, and the third detection beam 101c that have entered the interior 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 the surface of the external object 1000 that contacts the field of view area V1 of the first surface 111 when performing biometric detection.

[0044] Optionally, in some embodiments, the field of view region V1 intersects with the central axis of the first surface 111 along the length axis direction, or is disposed close to the central axis along the length axis direction of the first surface 111. Further, the center of the field of view region V1 may be located on the central axis of the first surface 111 along the length axis direction, or may be disposed close to the central axis.

[0045] Optionally, in some embodiments, the optical detection device 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 area V1 can be located on the central axis of the first surface 111 along the length direction or be arranged close to the central axis.

[0046] Optionally, in some embodiments, the optical detection device 1 is used in an electronic product, and the distance between the center of the field of view area V1 and the bottom edge of the electronic product is 5 to 25 mm, or 10 to 20 mm, for example but not limited to, the distance between the center of the field of view area V1 and the bottom edge of the electronic product is 15 mm. Further optionally, in some embodiments, the emission module 18 and the detection module 19 are both arranged adjacent to the 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 the center distance between the detection module 19 and the emission module 18 is 10 to 15 mm.

[0047] It can be understood that the external object 1000 can be a biological object with biological features, for example but not limited to, the external object 1000 is a finger, and the optical detection device 1 detects the fingerprint features of the finger. For a biological object, the first side surface 1001, the second side surface 1002, the third side surface 1003, the bottom surface of the external object 1000, etc. cannot be regarded as an ideal smooth plane.

[0048] Furthermore, 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 contacts the first surface 111, the ridges of the fingerprint directly cling to the first surface 111, and there is usually an air gap between the valleys of the fingerprint and the first surface 111. The detection beam 101 can be transmitted from the ridges and valleys of the fingerprint, enter the protective layer 11 through refraction and / or reflection, and further pass through the second surface 112 of the protective layer 11 and at least part of the display module 12 to be received by the detection module 19.

[0049] Optionally, in some embodiments, the third group of light emitting units 181c can be omitted, and the first detection light beam 101a emitted by the first group of light emitting units 181a can be projected onto 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 projected onto the first side 1001 and the third side 1003 of the external object 1000.

[0050] 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 portion of the first surface 111 corresponding to the field of view angle of the detection module 19 is the field of view area V1 of the detection module 19 on the first surface 111. When performing biometric detection, the external object 1000 can contact the field of view area V1, and the detection module 19 can receive the returned detection light beam 101 from the external object 1000, thereby realizing the 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 is received by the image sensor after the optical path is adjusted by the lens. The field of view angle of the detection module 19 refers to the field of view angle of the lens. It can be understood that the lens may include or be a short-focus lens, a lens group, a microlens, or a microlens array. Furthermore, in some embodiments, the number of detection modules 19 can be one or more. When the optical detection device 1 is configured with multiple detection modules 19, the multiple detection modules 19 can be set corresponding to different positions of the transparent area 110 to achieve a wide range of receiving the detection light beam 101 and imaging.

[0051] Please also read Figures 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 area V1 is point d. The spacing distance between the center a of the first group of light-emitting units 181a and the center c of the third group of light-emitting units 181c is L1, the spacing distance between the center b of the second group of light-emitting units 181b and the center c of the third group of light-emitting units 181c is L2, the center of the orthographic projection of the third group of light-emitting units 181c on the first surface 111 is c' (not shown), and the spacing distance between the centers d and c' of the field of view area V1 is L3. For example but not limited to: 5 mm ≤ L1 ≤ 25 mm, 5 mm ≤ L2 ≤ 25 mm, 5 mm ≤ L3 ≤ 25 mm. The spacing distance L1+L2 between a and b is not greater than 1 / 2 or 1 / 3 of the length of the width axis direction of the first surface 111. The spacing distance L3 between c' and d is not greater than 1 / 3 or 1 / 2 of the length of the side parallel to the length axis of the first surface 111. Of course, the specific values ​​or ratios of L1, L2, and L3 can be set to any appropriate value as needed, and this application does not limit this.

[0052] Optionally, 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 about the central axis of the first surface 111 parallel to the length axis.

[0053] Optionally, in some embodiments, L1=L2=8 mm to 21 mm, L3=10 mm to 18 mm. Optionally, in some embodiments, L1=L2=11.5 mm, L3=14 mm.

[0054] Optionally, in some embodiments, the center distance between the first group of light emitting units 181a and the second group of light emitting units 181b is greater than the width of the third side surface 1003 of the external object 1000. For example, but not limited to, the width of the first side surface 1001, the second side surface 1002, and the third side surface 1003 of the external object 1000 can be equivalent to a line segment with a length of about 15 mm on the first surface 111, such as Figure 1 As shown, the field of view area V1 is symmetrical about the central axis of the first surface 111 parallel to the length axis, so when L1=L2≥8 mm, the detection beam 101a emitted by the first group of light-emitting units 181a can be projected onto the first side surface 1001, and the detection beam 101b emitted by the second group of light-emitting units 181b can be projected onto the second side surface 1002. Thus, the emission module 18 can project the detection beam 101 to the external object 1000 from different angles and directions.

[0055] Optionally, in some embodiments, the spacing distance L1 between the center a of the first group of light emitting units 181a and the center c of the third group of light emitting units 181c may be 11.5 mm, and the spacing distance L2 between the center b of the second group of light emitting units 181b and the center c of the third group of light emitting units 181c may be 11.5 mm. The spacing 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.

[0056] Optionally, in some embodiments, the display module 12 includes a touch panel, or the display device 10 includes a touch panel disposed between the protection layer 11 and the display module 12 , and a user may control the display module 12 by touching the first surface 111 .

[0057] 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 provides 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.

[0058] The housing 13 includes a bottom 131 located below the display module 12 and a side 132 connected to the protective layer 11. The emission module 18 is connected to the inner wall of the side 132 connected to the protective layer 11. In this embodiment, the first surface 111 is the outermost surface of the front of the optical detection device 1. For an electronic device including the optical detection device 1, the first surface 111 is also the outermost surface of the electronic device.

[0059] Optionally, in some embodiments, the side of the protective layer 11 connected to the housing 13 is recessed inward, and the housing 13 is blocked by the protective layer 11 when viewed from the first surface 111 of the protective layer 11. At this time, the optical detection device 1 has a "full screen" effect when viewed from the first surface 111.

[0060] Optionally, in some embodiments, the housing 13 is configured to accommodate various electronic components, etc., and at least a portion of the housing 13 may be made of a conductive material. For example, but not limited to, the housing 13 may include a side wall forming the outer surface of the optical detection device 1, and the exposed portion of the optical detection device 1 may be made of a conductive metal. A printed circuit and / or a battery may be accommodated in the housing 13. For example, but not limited to, a processor, a communication module, various interfaces, a battery management module, a drive circuit, a control circuit, etc. may be mounted on a printed circuit board in the form of an integrated circuit chip.

[0061] Optionally, in some embodiments, the emission 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 required for light emission, such as, but not limited to, current, voltage, etc. 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, and 181c are fixedly connected to the circuit board 182.

[0062] 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 fixed frame 13 by means of glue, double-sided tape, bolts, snaps, welding, etc.

[0063] Optionally, in some embodiments, a buffer material is filled between the display module 12 and the bottom 131 and / or the side 132 of the fixing frame 13 , and the buffer material is, for example but not limited to, foam.

[0064] Optionally, in some embodiments, the transmitting module 18 or the detecting module 19 is fixedly connected or detachably connected to the bottom 131 and / or the side 132 of the fixing frame 13 by means of glue, double-sided tape, bolts, snaps, welding, etc.

[0065] See also Figure 5 , the first group, the second group, and the third group of light-emitting units 181a, 181b, and 181c each include two light-emitting units 188. The first group, the second group, and the third group of light-emitting units 181a, 181b, and 181c are disposed below the bottom of the protective layer 11 and arranged in a row along the width direction (X-axis) of the protective layer. The spacing between the centers of adjacent two groups of light-emitting units among the first group, the second group, and the third group of light-emitting units 181a, 181b, and 181c is equal. The spacing between adjacent light-emitting units 188 in each group is equal. The first plane 111 has a central axis along the direction parallel to the length axis. The orthographic projections of the first group, the second group, and the third group of light-emitting units 181a, 181b, and 181c on the first surface 111 are axially symmetrically distributed with respect to the central axis of the first plane 111 along the direction parallel to the length axis. The center-to-center spacing of the two light-emitting units 188 of the first group of light-emitting units 181a is L4a. The center-to-center spacing of the two light-emitting units 188 of the second group of light-emitting units 181b is L4b. The center-to-center spacing of the two light-emitting units 188 of the third group of light-emitting units 181c is L4c. 0 < L4a = L4b = L4c < 2 mm. In this embodiment, L1 = L2 > L4a = L4b = L4c, that is, the spacing between adjacent groups of light-emitting units is greater than the spacing between adjacent light-emitting units 188 in each group of light-emitting units.

[0066] Optionally, in some embodiments, for example but not limited to, L4a = L4b = L4c = 1.65 mm to 3 mm, the minimum edge distance between the first group of light-emitting units 181a and the third group of light-emitting units 181c is 6 mm to 20 mm, and the minimum edge distance between the second group of light-emitting units 181b and the third group of light-emitting units 181c is 6 mm to 20 mm. The length of the light-emitting unit 188 itself along the width axis (X-axis) is 1 mm, the length along the length axis (Y-axis) is 0.5 mm, and the length along the thickness axis (Z-axis) is 0.45 mm or 0.5 mm.

[0067] Of course, in other or modified embodiments, the first group, the second group, and the third group of light-emitting units 181a, 181b, and 181c may include one or more light-emitting units 188. This application does not limit the number of light-emitting units 188 included in the first group, the second group, and the third group of light-emitting units 181a, 181b, and 181c.

[0068] In addition, the emission module 18 may include two groups, three groups, or more groups of light-emitting units, and the number of light-emitting units in each group may be one or more. The multiple groups of light-emitting units of the emission module 18 may be arranged in a row along the width axis direction, or may have other arrangements, such as but not limited to: below the non-transparent regions at the four corners of the protective layer 11, or arranged in two rows, etc. This application does not limit this.

[0069] Optionally, in some embodiments, the multiple groups of light emitting units are located at the same height in the Z-axis direction.

[0070] Optionally, in some embodiments, the spacing between different groups of light-emitting units (center spacing between groups) may be equal or unequal, and the center spacing between multiple light-emitting units 188 in the same group of light-emitting units may be equal or unequal. The center spacing between multiple light-emitting units 188 in a certain group of light-emitting units and the center spacing between multiple light-emitting units 188 in another group of light-emitting units may be equal or unequal.

[0071] The orthographic projections of the emission module 18 and the display module 12 on the first surface 111 of the protective layer 11 do not overlap, and the orthographic projection of the emission module 18 on the plane perpendicular to the first surface 111 and the orthographic projection of the display module 12 on the plane partially or completely overlap. Optionally, 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. Optionally, in some embodiments, the orthographic projection of the emission module 18 on the plane perpendicular to the first surface 111 and the orthographic projection of the display module 12 on the plane may partially overlap or not overlap.

[0072] Optionally, in some embodiments, the minimum distance between the edges of the emitting 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 emitting module 18 and the display module 12 is 3 mm, so that the detection light beam 101 emitted by the emitting module 18 will not be blocked by the display module 12.

[0073] At least part of the detection module 19 is located below the display module 12. The detection module 19 is fixedly connected to 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 groove, and part or all of the detection module 19 is located in the through hole or the groove. The detection module 19 receives the detection light beam 101 transmitted by the external object 1000 through the protective layer 11 and the display module 12. Optionally, in some embodiments, at least part 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 protective layer 11 and at least part of the display module 12.

[0074] Optionally, in some embodiments, the transmitting module 18 projects the detection beam 101 to the external object 1000. The detection module 19 can 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 external object 1000 and then transmits from the external object 1000, and / or the detection beam 101 reflected by the external object 1000.

[0075] 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.

[0076] Optionally, 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 .

[0077] Although the embodiments of the present application describe the main imaging principles and optical paths of the detection module 19 and the emission module 18 , the present application is not limited thereto.

[0078] The protective layer 11 may be a single-layer structure or a multi-layer structure. In this embodiment, the protective layer 11 is generally a thin plate with a predetermined length, width, and thickness. Figure 1 The Y axis corresponds to the length axis, and Figure 1 The X-axis in the image is the width axis, and Figure 1 The Z axis corresponds to the thickness axis.

[0079] Optionally, the protective layer 11 may include a transparent substrate and optical ink, wherein the transparent substrate is the main body of the protective layer 11, and the optical ink is located at the edge of the lower surface of the transparent substrate, and the optical ink can transmit invisible light and block visible light, so that the protective layer 11 can form a transparent area 110 and a non-transparent area 120. For example but not limited to, the detection beam 101 is near-infrared light, and the detection beam 101 can pass through the optical ink and the transparent substrate, while visible light cannot pass through the optical ink. Further optionally, the transparent substrate may be glass, resin, plastic or any transparent substance.

[0080] The optical ink may be an infrared ink, which can transmit near-infrared light and block visible light. The near-infrared light may be a light beam with a wavelength of 750 nm (nanometers) to 2000 nm. For example, but not limited to, in the embodiment of the present application, the detection light beam 101 is a near-infrared light with a wavelength of 800 nm to 1200 nm. The biometric information of the external object 1000 is collected by optical imaging using near-infrared light as the detection light beam 101, which will not be affected by the visible light from the display module 12 or the environment, nor will it affect the normal image display of the display module 12.

[0081] Since the emission module 18 can project the detection light beam 101 to the sides of the external object 1000 with different orientations, the detection light beam 101 can enter the interior of the external object 1000 and be transmitted out, and then can be received by the detection module 19 and used to generate a biometric image of the external object 1000.

[0082] Please also see Fig. 6A, the light emitting angle of the light emitting unit 188 in the plane where the width axis (X axis) and the thickness axis (Z axis) of the protective layer 11 are located is α. Please also refer to Figure 6B , the light-emitting angle of the light-emitting unit 188 in the plane where the length axis (Y axis) and the thickness axis (Z axis) of the protective layer 11 are located is β. In this embodiment, 0°<α=β≤145°. For example but not limited to, 100°≤α=β≤140°. Further, the light-emitting angle range of the light-emitting unit 188 can be regarded as a cone. Since the light-emitting angle range of the light-emitting unit 188 is larger, the range or area of ​​the light-entering area of ​​the second surface 112 of the protective layer 11 can be larger, and thus the range or area of ​​the area where the detection light beam 101 is emitted from the first surface 111 is larger, and thus the external object 1000 can receive the detection light beam 101 emitted from the first surface 111 from a larger range in the contact field area V1.

[0083] The light emitting unit 188 has a light emitting surface (not numbered), the light emitting surface is parallel to the first surface 111 of the protective layer 11; or the light emitting surface and the first surface 111 have an angle, and the field of view area of ​​the light emitting surface facing the first surface 111 is relatively inclined 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 a preset distance from the second surface 112 of the protective layer 11. Exemplarily, the preset distance is 0 to 1 mm, or 1 mm to 3 mm.

[0084] For example, but not limited to, the center of the light emitting surface and the second surface 112 are spaced 0.4 mm to 0.5 mm apart, and the light emitting surface of the light emitting unit 188 can be a rectangle of 1 mm*0.5 mm, and the minimum distance between the edge of the light emitting unit 188 and the edge of the display module 12 is 3 mm, and the light emitting angle of the light emitting unit 188 is approximately 140°, and the light emitting range of the light emitting unit 188 will not be 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 can be other values ​​that meet the needs, and the present application is not limited to this.

[0085] 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 located in the non-transparent area 120 .

[0086] See also Figure 7 , is a schematic diagram of a further embodiment of the optical detection device 1, wherein the display device 10 further includes a light converter 14. The light converter 14 is located below the non-transparent region 110, is attached to the second surface 112, and is located between the light emitting surface of the light emitting unit 188 and the second surface 112. There is air between the light emitting surface of the light emitting unit 188 and the light converter 14.

[0087] The optical converter 14 is used to deflect the detection light beam 101 emitted by the emission unit 188 toward the direction of the field of view area V1, so that the incident angle of the detection light beam 101 when entering the protective layer 11 becomes larger, so that the detection light beam 101 can be emitted from a position closer to the central area of ​​the first surface 111 to the inside of the external object 1000 located above the first surface 111. In this way, when the emission module 18 and the light emitting unit 188 are located below the bottom 140 of the protective layer 11 and the non-transparent area 110, the field of view area V1 can have a larger distance from the bottom 140, that is, when the external object 1000 is detected, it can contact the field of view area V1 near the center of the first surface 111. The field of view area V1 is the area where the first surface 111 is located within the field of view angle range of the detection module 19. Therefore, by setting the optical converter 14, the distance between the emission module 18 and the detection module 19 in the longitudinal axis direction of the protective layer 11 is increased. The external object 1000 is, for example but not limited to, a finger. When the fingerprint feature of the finger is detected, the finger can contact the field of view area V1 closer to the center of the first surface 111 to realize the collection of optical fingerprint feature information. Optionally, in some embodiments, the above-mentioned light converter 14 can be a prism, a lens, a prism, a ball table, an optical multilayer film, an optical diffraction element, a grating, an aperture, an optical microstructure, and other structures or components or one or more combinations thereof. For example but not limited to, a part of the light converter 14 can be a grating and a part can be an optical microstructure. Optionally, in some embodiments, the light converter 14 can also be omitted or integrated in the protective layer 11. Optionally, in some embodiments, the light converter 14 is integrally formed with the protective layer 11. Optionally, 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 with the central axis. The light converter 14 has a rectangular shape with a width and a length ranging from 1 mm to 3 mm. Alternatively, the light converter 17 has any other shape that meets product requirements, such as but not limited to a circle, an ellipse, a rounded rectangle, etc., which is not limited in the present invention.

[0088] See also Figure 8 , is a schematic diagram of a modified embodiment of the optical detection device 1, for the convenience of description, Figure 8 The component names and numbers are the same as Figures 1 to 3remain consistent. The emission 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 that forms a predetermined angle with the second surface 112. The light emitting surface 1881 and the second surface 112 are spaced apart by air and are relatively inclined. For example, but not limited to, the predetermined angle formed by the light emitting 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 connected to the side 132 of the housing 13 through an optical bevel 185. By configuring the light emitting unit 188 to have a predetermined angle between the light emitting unit 188 and 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 protective layer 11 can have a larger value range, and the detection light beam 101 can more easily enter the external object 1000 when it is emitted from the first surface 111.

[0089] 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 detection module 19 has one field of view area V1 on the first surface 111 of the protective layer 11. The field of view area V1 is at least partially located in the transparent area 120. The area of ​​the field of view area V1 is smaller than the surface area of ​​the upper surface of the transparent area 120. The field of view area V1 is adjacent to or far away from the non-transparent area 110. Optionally, in some embodiments, the number of the detection modules 19 may be multiple or the detection module 19 may include multiple receiving units, and the multiple receiving units have multiple field of view areas V1 on the second surface 112, thereby expanding the sensing area of ​​the biometric feature. Even, the multiple field of view areas V1 can be extended to the upper surface of the entire transparent area 120. Thereby, full-screen biometric sensing is achieved.

[0090] In the embodiment of the present application, the first surface 111 is the upper surface of the protective layer 11, the second surface 112 is the lower surface of the protective layer 11, and the first surface 111 and the second surface 112 are arranged opposite to each other. Optionally, in other or modified embodiments, the second surface 112 may be an inclined surface or a side surface of the protective layer 11. The side surface of the protective layer 11 may be a plane or a curved surface.

[0091] The optical detection device 1 can detect the 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, etc. In this embodiment, taking fingerprint detection as an example, part or all of the field of view area V1 is the 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 the surface that the user's finger 1000 directly contacts during fingerprint detection, which is usually the outermost surface of the optical detection device 1 or an electronic product including the optical detection device 1. The detection light beam 101 can be emitted from the first surface 111 and enter the inside of the finger from the side of the finger with different orientations. When the finger contacts the field of view area V1 or is located above the field of view area V1, the detection light beam 101 entering the inside of the finger is transmitted through the ridges and valleys of the fingerprint and further passes 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 light beam 101 transmitted from the ridges and valleys of the fingerprint has different refractive indices when entering the protective layer 11, the detection light beam 101 transmitted from the ridges and valleys of the fingerprint received by the detection module 19 has different beam intensities. Detection light beams 101 of different intensities can be used to generate fingerprint optical images with corresponding different light and dark contrasts.

[0092] Optionally, in some embodiments, the width of the light emitting unit 188 (along the Y-axis direction) is 0.5 mm, and the light emitting unit 188 is a top-emitting light emitting element. Exemplarily, the size of the light emitting unit 188 is 1 mm*0.5 mm*1 mm. Optionally, in some embodiments, the light emitting unit 188 can be a side-emitting light emitting element.

[0093] Optionally, in some embodiments, the emission module 18 may further include a circuit board 182, which is a flexible circuit board. The circuit board 182 is electrically connected to the light-emitting unit 181, and the circuit board 182 may be fixedly connected or detachably connected to the side 132 and / or bottom 131 of the fixed frame 13 by glue, double-sided tape, adhesive, bolts, brackets, clips, slots, welding, and fixing.

[0094] Optionally, the shape of the field of view area V1 can be square, circular, elliptical, etc., which is not limited in the embodiment of the present invention. Optionally, the field of view area V1 is circular, and its radius ranges from 2 to 5 mm, or 3 to 4 mm, or 3 to 5 mm. When the field of view area V1 is larger, the area where the external object 1000 can contact the first surface 111 to collect biometric information is larger during biometric detection.

[0095] Optionally, the light-emitting unit 188 is one or more of, for example but not limited to, LED (light emitting diode), LD (laser diode), VCSEL (vertical cavity surface emitting laser), Mini-LED, Micro-LED, OLED (organic light emitting diode), QLED (quantum dot light emitting diode), or a light-emitting array composed of one or more of LED, LD, VCSEL, Mini-LED, Micro-LED, OLED, and QLED.

[0096] The detection module 19 in the embodiment of the present invention receives a detection light beam 101 that is returned from an external finger 1000 and is used for fingerprint detection. The detection light beam 101 that is returned from the finger 1000 includes but is not limited to: a detection light beam 101 that is diffusely reflected at the ridge of the fingerprint, and / or a detection light beam 101 that enters the interior of the finger 1000 and is transmitted by the finger 1000, and / or a detection light beam 101 that is reflected on the surface of the finger 1000.

[0097] Compared with the prior art, in the embodiments and modified embodiments of the present application, by configuring the emission module 18, the emission module 18 can project the detection beam 101 onto the side of the external object 1000 with different orientations, while the prior art can usually only project onto one side of the external object 1000, that is, in the embodiments of the present application, the detection beam 101 can be projected onto the external object 1000 from multiple directions or multiple angles, while the prior art projects from a single direction. When performing biometric detection, when the detection beam 101 and the biometrics of the external object 1000 itself are at different angles, the biometric image generated based on the detection beam 101 returned by the external object 1000 received by the detection module 19 also has different imaging clarity. Therefore, when using the optical imaging of the external object 1000 for biometric detection, the detection beam projected in a single direction cannot guarantee the quality of the optical imaging, and projecting the detection beam 101 to the external object 1000 from multiple directions and multiple angles can greatly improve the efficiency and accuracy of biometric detection.

[0098] When the optical detection device 1 of the present application performs biometric detection on an external object 1000, for example, it can project light onto three different sides of the external object 1000. In this way, the external object 1000 receives the detection light beam 101 at a greater angle and with a greater amount of light, so that the detection module 19 receives the detection light beam 101 transmitted by the external object 1000 with a better imaging effect, thereby improving the efficiency and accuracy of biometric detection.

[0099] In addition, by setting three groups of light-emitting units to correspond to three different sides of the external object respectively, the three groups of light-emitting units are set at appropriate intervals, which can not only meet the angle requirements of the detection light beam 101 during biometric detection, but also save energy consumption and reduce heat, thereby improving the utilization rate of the detection light beam 101.

[0100] It should be noted that the detection module 19 receives the refracted detection beam 101 from the ridges and valleys and is used for fingerprint optical imaging. However, the present invention is not limited to this, and the detection module 19 can receive other light beams with fingerprint feature information for imaging or detection. For example, but not limited to, the detection module 19 can 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 use it for fingerprint detection; for example, but not limited to, the detection module 19 receives the detection beam 101 diffusely reflected at the ridge and is used for fingerprint optical imaging; for example, but not limited to, the detection module 19 can 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 can receive visible light and / or invisible light in the external environment transmitted by the user's finger and be used for fingerprint detection; for example, but not limited to, the detection module 19 can receive visible light and / or invisible light emitted by the user's finger and be used for fingerprint detection. Further, the above-mentioned fingerprint detection can also be detection of other detection objects, and any detection object that can obtain feature information of the detection object by optical imaging is acceptable. Therefore, although the embodiment of the present invention is described by taking the receiving of diffusely reflected detection light beam 101 as an example, other possible light beams used for fingerprint optical imaging also fall within the protection scope of the present invention.

[0101] In the present application, the optical detection device 1 can be a mobile phone, a tablet computer, a smart watch, an augmented reality / virtual reality device, a human motion detection device, an autonomous driving car, a smart home device, a security device, a medical device, an intelligent robot, etc., or components thereof.

[0102] The structures and positions of the light guide unit, display module, emission module, detection module, light converter, light-emitting unit, field of view area, etc. in the above-mentioned embodiments or modified embodiments of the present invention and the corresponding modified settings can also be applied to other embodiments disclosed in the present invention. The embodiments obtained therefrom and their replacement, deformation, combination, splitting, expansion, omission, etc. all fall within the protection scope of the present invention.

[0103] It should be noted that the light emitting surface, light incident surface, etc. that may appear in the description of the present invention may be an actual physical surface or an imaginary surface, which does not affect the implementation of the technical solution of the present invention and belongs to the scope of the present invention. In addition, the terms "overlap", "coincidence" and "overlap" that may appear in the description of the present invention should be understood to have the same meaning and can be replaced with each other.

[0104] It should be noted that those skilled in the art can understand that, without paying any creative work, part or all of the embodiments of the present invention, as well as part or all of the deformation, replacement, change, split, combination, expansion, etc. of the embodiments should be considered to be covered by the inventive ideas of the present invention and belong to the protection scope of the present invention.

[0105] Any reference in this specification to "one embodiment," "an embodiment," "an example embodiment," etc., indicates that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Such phrases appearing in different places in this specification do not necessarily all refer to the same embodiment. In addition, when a particular feature or structure is described in connection with any embodiment, it is claimed that it is within the skill of those skilled in the art to implement such feature or structure in connection with other embodiments of these embodiments.

[0106] The orientation or positional relationship indicated by “length”, “width”, “up”, “down”, “left”, “right”, “front”, “rear”, “back”, “front”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, etc. that may appear in the specification of the present invention is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. Similar numbers and letters represent similar items in the drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present invention, the terms “first”, “second”, etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present invention, the meaning of “multiple” or “multiple” is at least two or two, unless otherwise clearly and specifically defined. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0107] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. The terms used in the claims should not be understood to limit the invention to the specific embodiments disclosed in this specification. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. An optical detection device, which can actively emit light to an external object and realize biometric detection by receiving the return light of the external object, characterized in that: include: A liquid crystal display device, comprising a liquid crystal display module and a protective layer, wherein the protective layer is located above the liquid crystal display module, the protective layer having a first surface for contact with an external object to achieve interaction or biometric detection, the liquid crystal display module comprising a liquid crystal display unit and a backlight unit, the backlight unit being used to provide a backlight beam of visible light to the liquid crystal display unit, the backlight beam being able to pass through the liquid crystal display unit and the protective layer to be emitted to the outside to achieve image display, wherein the first surface of the protective layer has a length axis and a width axis perpendicular to each other, and the protective layer has a top and a bottom arranged oppositely along the length axis direction; An emission module is located below the first surface, the vertical projections of the emission module and the liquid crystal display module on the first surface do not overlap or partially overlap, the emission module includes three groups of light-emitting units, the spacing between adjacent groups is equal, the three groups of light-emitting units are arranged below the bottom of the protective layer, and are arranged in a row along a direction parallel to the width axis, the first surface has a central axis along a direction parallel to the length axis, the orthographic projections of the first group, the second group and the third group of light-emitting units on the first surface are axially symmetrical about the central axis of the first surface along a direction parallel to the length axis, the three groups of light-emitting units can emit a detection beam of near-infrared light, and the detection beam can pass through the protective layer and be projected onto the side surfaces of an external object with different orientations; a detection module, at least partially located below the liquid crystal display module or inside the liquid crystal display module, wherein a detection light beam returned from an external object can be received by the detection module through the protective layer and at least a portion of the liquid crystal display module, and the detection module converts the received detection light beam into a corresponding electrical signal to obtain biometric information of the external object; and The liquid crystal display module is fixedly connected or detachably connected to the bottom and / or side of the fixed frame.

2. The optical detection device according to claim 1, characterized in that: Each group of light-emitting units includes two light-emitting units, and the center spacing between adjacent light-emitting units in each group is equal, and the center spacing between adjacent groups is different from the spacing between adjacent light-emitting units in each group; or, at least one group of light-emitting units includes not less than two light-emitting units, and the center spacing between adjacent light-emitting units in the group of light-emitting units is smaller than the center spacing between light-emitting units in adjacent groups.

3. The optical detection device according to claim 1, characterized in that: The length of the emission module in a direction parallel to the width axis is not less than the length of the external object in a direction parallel to the width axis of the protective layer.

4. The optical detection device according to claim 1, characterized in that: The sides of the external object with different orientations 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 group of light-emitting units is used to project a detection beam to the first side of the external object, the second group of light-emitting units is used to project a detection beam to the second side of the external object, and the third group of light-emitting units is used to project a detection beam to the third side of the external object. The protective layer has a first side portion and a second side portion that are relatively arranged along the width axis direction, the first side portion faces the first side portion, the second side portion faces the second side portion, and the third side portion faces the bottom or the top.

5. The optical detection device according to claim 4, characterized in that: The detection light beam can enter the interior of the external object from the first side, the second side and the third side. The detection light beam entering the interior of the external object can be emitted from the bottom surface of the external object and penetrate the protective layer before being received by the detection module.

6. The optical detection device according to claim 5, characterized in that: The external object is a finger, the bottom surface of the finger includes a fingerprint, and during detection, the fingerprint contacts the field of view area of ​​the detection module on the first surface, and the field of view area is the portion of the first surface within the field of view angle range of the detection module.

7. The optical detection device according to claim 1, characterized in that: 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. The orthographic projection of the third group of light-emitting units on the first surface intersects with 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 both sides of the third group of light-emitting units. The spacing distance from the center of the first group of light-emitting units to the center of the third group of light-emitting units is L1, and the spacing distance from the center of the second group of light-emitting units to the center of the third group of light-emitting units is L2. The portion of the first surface located within the field of view angle range of the detection module is the field of view area. The spacing distance between the center of the field of view area and the center of the orthographic projection of the third group of light-emitting units on the first surface is L3. The field of view area is the portion of the first surface located within the field of view angle range of the detection module. L1=L2=8 mm to 21 mm, L3=10 mm to 18 mm.

8. The optical detection device according to claim 1, characterized in that: The three groups of light emitting units respectively include two light emitting units, the center distance between the two light emitting units in the same group of light emitting units is 1.65 mm to 3 mm, and the minimum edge distance between adjacent groups of light emitting units is 6 mm to 20 mm.

9. The optical detection device according to claim 6, characterized in that: The diameter of the field of view area ranges from 7 mm to 10 mm.

10. The optical detection device according to claim 1, characterized in that: The liquid crystal display device also includes a shell, which is used to accommodate and carry the liquid crystal display module and the protective layer. The shell includes a bottom located below the liquid crystal display module and a side connected to the protective layer, and the emission module is fixedly connected to the side.

11. The optical detection device according to claim 10, characterized in that: The light emitting unit has a bottom surface connected to the side portion and a light emitting surface for emitting a detection light beam, the light emitting surface is a side surface of the light emitting unit, the light emitting unit is a side emitting light emitting element, and the light emitting surface is parallel to the first surface or at an acute angle.

12. The optical detection device according to claim 1, characterized in that: The protective layer has a transparent area and a non-transparent area located around the transparent area, the bottom and top of the protective layer are located in the non-transparent area, the transparent area can transmit visible light and detection light beams, the non-transparent area can block visible light and transmit detection light beams, the field of view area is the portion of the first surface located within the field of view angle range of the detection module, the field of view area is at least partially located in the transparent area, the liquid crystal display module is partially or completely located below the transparent area, the emission module is located below the non-transparent area, the detection module is partially or completely located 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, and the detection module can receive the detection light beam returned by an external object through at least part of the liquid crystal display module.

13. The optical detection device according to claim 2, characterized in that: The light emitting unit has a light emitting surface, the protective layer has a second surface opposite to the first surface, the center of the light emitting surface and the second surface of the protective layer are spaced apart by a preset distance, and the preset distance is 0 to 1 mm, or 1 mm to 3 mm.

14. The optical detection device according to claim 2, characterized in that: The light emitting unit has a light emitting angle of 140 degrees along a length axis direction of the first surface and a light emitting angle of 140 degrees along a width axis direction of the first surface.

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