CN211698976U - Optical detection device and electronic equipment - Google Patents

Abstract

The present application discloses an optical detection device, which includes: a protective layer, including an upper surface and a lower surface arranged oppositely; a detection module located below the lower surface, and the receiving module has a field of view area on the upper surface ; and a first light-emitting combination and a second light-emitting combination located under a portion of the lower surface, for projecting detection light in different directions to an external object located above the protective layer during the first period and the second period, respectively. The first light-emitting combination and the second light-emitting combination respectively have a plurality of light-emitting units arranged at non-equidistant intervals, and the detection module is used for receiving the detection light returned by the external object in the field of view during the first period to obtain Corresponding first detection information, the detection module is used to receive the detection light returned by the external object in the field of view area during the second period to obtain corresponding second detection information, the first detection information or/and The second detection information is used for the identification of the external object.

Description

An optical detection device and electronic equipment

technical field

The present application relates to the field of optoelectronic technology, and in particular, to an optical detection device and electronic equipment.

Background technique

With the advancement of technology and the improvement of people's living standards, users require more functions and stylish appearance for electronic devices such as mobile phones, tablet computers, and cameras. At present, the development trend of electronic devices such as mobile phones is to have a high screen ratio and to have functions such as fingerprint detection. In order to achieve a full-screen or near-full-screen effect and make electronic devices have a high screen-to-body ratio, under-screen fingerprint detection technology came into being. However, for non-self-luminous displays such as liquid crystal displays, there is no better under-screen detection solution in the prior art.

Utility model content

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

One aspect of the present application is an optical detection device, comprising:

a protective layer, including an upper surface and a lower surface arranged oppositely;

a display module, located below the protective layer, used for displaying images;

The detection module is located below the lower surface, the detection module has a preset field of view, and the part of the upper surface of the protective layer that is located within the field of view of the detection module is defined as the detection module the field of view area of the group;

a first light-emitting combination, located below the lower surface, for projecting detection light to an external object located above the protective layer during a first period of time; and

a second light-emitting combination, located below the lower surface, for projecting detection light to an external object located above the protective layer during a second period of time;

Wherein, the first light-emitting combination includes a plurality of light-emitting units, two adjacent light-emitting units in the first light-emitting combination have at least two unequal spacings, and the second light-emitting combination includes a plurality of light-emitting units , there are at least two unequal spacings between adjacent light-emitting units in the second light-emitting combination, at least part of the detection light emitted by the first light-emitting combination and at least part of the detection light emitted by the second light-emitting combination The light is projected to the external object along different directions, the first time period and the second time period are respectively different time periods, and the detection module is used for receiving the external object in the field of view during the first time period. The detection light returned by the internal object is used to obtain the corresponding first detection information of the external object, and the detection module is configured to receive the detection light returned by the external object in the field of view area during the second period to obtain the corresponding second detection information of the external object. , the first detection information or/and the second detection information are used for identifying the external object.

In some embodiments, the first light-emitting combination includes one or more first light-emitting units for projecting the first detection light and at least one third light-emitting unit for projecting the third detection light. A light-emitting unit has an equal first interval, an adjacent first light-emitting unit and a third light-emitting unit have a second interval, the second interval is greater than the first interval, and the second light-emitting combination includes one or A plurality of second light-emitting units for projecting the second detection light and at least one third light-emitting unit for projecting the third detection light, the adjacent second light-emitting units have equal fourth intervals, and the adjacent second light-emitting units have equal fourth intervals. There is a fifth interval between the second light-emitting unit and the third light-emitting unit, and the fifth interval is greater than the fourth interval.

In some embodiments, the value range of the first interval and the fourth interval is 0.5mm to 2mm, and the value range of the second interval and the fifth interval is 8mm to 12mm.

In some embodiments, the third light-emitting unit in the first light-emitting combination and the second light-emitting combination is located between the adjacent first and second light-emitting units.

In some embodiments, the distance between adjacent first light-emitting units and second light-emitting units ranges from 10 mm to 25 mm, and the third light-emitting unit is located between the first light-emitting unit and the second light-emitting unit intermediate position between.

In some embodiments, the optical detection device is applied to an electronic device, the electronic device has a length axis along its own length direction and a width axis along its own width direction, and the upper surface of the protective layer includes a length axis along its own length direction and a width axis along its own width direction. The length axis of the device is opposite to the top edge and the bottom edge, and the line between the midpoint of the top edge and the midpoint of the bottom edge is defined as the long axis of the upper surface, and the field of view area The center is located on or close to the long axis, and the orthographic projection of the first light-emitting combination on the upper surface of the protective layer and the orthographic projection of the second light-emitting combination on the upper surface of the protective layer are about the long axis distributed symmetrically.

In some embodiments, the first light-emitting combination and the second light-emitting combination are arranged at intervals along the width axis of the electronic device, wherein the first light-emitting combination is provided with a side of the third light-emitting unit and One or more of the first light-emitting units and one or more of the second light-emitting units are spaced apart along the width axis of the electronic device. Arrange.

In certain embodiments, the protective layer has a continuous transparent area and a non-transparent area, the non-transparent area is located around or at the edge of the transparent area, the transparent area is used to transmit visible light, and the non-transparent area The area is used to block visible light and transmit the detection light, the first light-emitting combination and the second light-emitting combination are located below the non-transparent area of the protective layer, and the display module is located in the transparent area of the protective layer. below.

In some embodiments, the display module is a passive light-emitting display module, including a display panel and a backlight module located below the display panel, the backlight module is used to provide a backlight beam to the display panel, so The backlight beam is a visible light beam, and the display panel uses the backlight beam to display a picture.

In some embodiments, a support frame is further included, the support frame is used to carry the protective layer, the display module, the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, or/and the detection module, The support frame includes a bottom plate and a side wall, the bottom plate is parallel to the upper surface of the protective layer, the side wall extends from the edge of the bottom plate and surrounds the periphery of the protective layer, and the side wall includes a surface facing the display. On the inner surface of the module, the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit are fixedly connected or detachably connected to the inner surface.

In some embodiments, the external object is a fingerprint, the detection light passes through the protective layer and then enters the finger and propagates, and then transmits from the surface of the finger with the fingerprint pattern and returns to the detection module, and passes through the finger. The returned detection light carries fingerprint characteristic information of the finger, and the first detection information and the second detection information obtained by the conversion of the detection light by the detection module are the first fingerprint image and the second fingerprint image, respectively.

In some embodiments, the light-emitting surfaces of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit are parallel to the upper surface of the protective layer.

In some embodiments, the light-emitting angles of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit vary from 90 degrees to 160 degrees.

In some embodiments, the first light-emitting unit, the second light-emitting unit, or/and the third light-emitting unit may be one of LED, LD, VCSEL, Mini-LED, Micro-LED, OLED, QLED, or various combinations.

In some embodiments, the area of the upper surface of the protective layer that can be irradiated by the first light-emitting combination and the second light-emitting combination is defined as an irradiation area, and the first detection light, the second detection light and the third detection light It is emitted from the irradiated area to the finger, and the irradiated area and the field of view area do not overlap.

An aspect of the present application provides an electronic device, including the optical detection device in any one of the foregoing embodiments, wherein the upper surface of the protective layer is the outer surface of the electronic device.

The beneficial effect of the present application is that in the optical detection device provided by the present application, detection light sources are respectively set at different positions compared with the field of view area, and the external objects in contact with the field of view area are illuminated from different directions respectively, and different external objects obtained correspondingly The clear part and the blurred part in the image can complement each other, which is beneficial to improve the recognition efficiency of external objects.

Description of drawings

1 is a schematic front view of the optical detection device provided by the first embodiment of the present application applied to an electronic device;

Fig. 2 is a partial cross-sectional schematic diagram of the optical detection device in Fig. 1 along line II-II;

FIG. 3 is a schematic diagram of the arrangement of a light-emitting unit of a detection light source of the optical detection device described in FIG. 1;

4 is a schematic diagram of the arrangement of a light-emitting unit of a detection light source of the optical detection device described in FIG. 1;

Fig. 5a-Fig. 5b are the fingerprint shadow situations formed when the detection light source of the optical detection device described in Fig. 1 illuminates the simplified fingerprint pattern from different directions;

FIG. 6 is a schematic diagram of a control circuit of the detection light source of the optical detection device shown in FIG. 1 .

7 is a schematic front view of the optical detection device provided by the second embodiment of the present application applied to an electronic device;

FIG. 8 is a schematic diagram of a control circuit of the detection light source of the optical detection device shown in FIG. 7 .

Detailed ways

In the detailed description of embodiments of the present application, it will be understood that when a substrate, sheet, layer or pattern is referred to as being "on" or "under" another substrate, sheet, layer or pattern, it It may be "directly" or "indirectly" on another substrate, another sheet, another layer or another 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 the purpose of clarity. Furthermore, the sizes of elements in the drawings do not fully reflect actual sizes.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

Further, the described features and structures may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to enable a thorough understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical solutions of the present application may be practiced without one or more of the specific details, or with other structures, components, and the like. In other instances, well-known structures or operations have not been shown or described in detail to avoid obscuring the focus of this application.

Please refer to FIG. 1 to FIG. 2 at the same time. FIG. 1 is a schematic front view of the optical detection device 10 provided in the first embodiment of the present application applied to the electronic device 1 , and FIG. 2 is the optical detection device 10 in FIG. 1 along II-II. Schematic of a partial cross-section of the wire. The electronic device 1 has a length axis along its own length direction Y, a width axis along its own width direction X, and a thickness axis along its own thickness direction Z. The electronic device 1 includes a top portion 13 and a bottom portion 14 disposed opposite to each other along the length direction Y of the electronic device 1 . The electronic device 1 is, for example, a mobile phone, which may include an earpiece 130 , a front camera 132 , and a sound sensor 140 . The earpiece 130 and the front-facing camera 132 may be disposed at a position of the electronic device 1 close to the top 13 . The sound sensor 140 , such as a microphone, can be arranged at a position of the electronic device 1 close to the bottom 14 . The electronic device 1 further includes a first side edge 17 and a second side edge 18 disposed opposite to each other along the width axis X. From the front view of the electronic device 1 that is often used, the first side 17 is the left side of the electronic device 1 , and the second side 18 is the right side of the electronic device 1 .

The optical detection device 10 is used to detect features of external objects, such as fingerprints on a user's finger. However, the optical detection device 10 is not limited to the detection of fingerprints, and the detection object of the optical detection device 10 may be any external object that can be imaged. In this application, the optical detection device 10 is described by taking the detection of a fingerprint as an example. It can be understood that the skin surface texture of the palm, toes, and other parts can also be used as the detection object of the optical detection device 10 of the present application or the characteristics of the external object to be detected.

The optical detection device 10 includes a display device 12 , a detection light source 16 and a detection module 19 . The display device 12 includes a protective layer 100 and a display module 104 . The protective layer 100 includes an upper surface 101 and a lower surface 102 which are disposed opposite to each other. The display module 104 is used for displaying images, the display module 104 is located below the lower surface 102 of the protective layer 100 , and the protective layer 100 is used to protect the display module 104 from the external environment. The detection light source 16 is located under a part of the protective layer 100 , and the detection light source 16 is used for projecting the detection light 11 to an external object located above the protective layer 100 . The detection light 11 includes a first detection light 110 and a second detection light 112 projected from different directions to an external object, and the projection direction of the first detection light 110 is different from the projection direction of the second detection light 112 . The detection module 19 is located below the lower surface 102 of the protective layer 100 , and the detection module 19 is used to receive the detection light 11 returned by an external object through the protective layer 100 and at least part of the display module 104 , the detection light 11 returned via the external object carries the biometric information of the external object. The detection module 19 receives the first detection light 110 returned by the external object to obtain the corresponding first detection information of the external object. The detection module 19 receives the second detection light 112 returned by the external object to obtain second detection information corresponding to the external object. The first detection information or/and the second detection information may be used for identification of the external object.

Optionally, in some embodiments, the upper surface 101 or/and the lower surface 102 is a plane; or, the main body of the upper surface 101 or/and the lower surface 102 is a plane, and the edge part of the main body is surface.

Optionally, in some embodiments, the protective layer 100 has a connected non-transparent area 210 and a transparent area 220 , and the non-transparent area 210 is located around or at the edge of the transparent area 220 . The transparent area 220 is used to transmit visible light, and the non-transparent area 210 is used to block visible light and transmit the detection light 11 . The visible light beam emitted by the display module 104 is emitted to the outside of the display device 12 through the transparent area 220 to realize image display. The non-transparent area 210 is used to block visible light so that the user cannot see the components inside the display device 12 in the non-transparent area 210 . In the embodiment of the present application, the transmittance of the non-transparent region 210 to visible light is less than a preset threshold, for example: 10%, 5%, 1%, 0%. Of course, alternatively, the transmittance of the non-transparent region 210 to visible light beams is not limited to less than 10%, as long as no internal elements can be seen through the non-transparent region 210 from the outside of the protective layer 100 That's it. It can be understood that the main body of the protective layer 100 is a transparent substrate (not marked), and the protective layer 100 can realize the non-transparent substrate by disposing the optical film layer 122 on the lower surface 102 of the part of the transparent substrate located in the non-transparent area 210 . The transparent area 210 has the function of blocking visible light, the non-transparent area 210 of the protective layer 100 includes the optical film layer 122 and the part of the transparent substrate facing the optical film layer 122, and the transparent area 220 of the protective layer 100 includes the transparent substrate. The part opposite to the optical film layer 122 . The material of the transparent substrate is, for example, but not limited to, transparent glass, transparent polymer material, or other transparent materials. The protective layer 100 may be a single-layer structure or a multi-layer structure. The protective layer 100 is roughly a thin plate with a predetermined length, width and thickness. The length direction of the protective layer 100 is the Y direction of the length axis of the electronic device 1 shown in FIG. 2 , and the width direction is the direction shown in FIG. 2 . The width axis X direction and the thickness direction of the electronic device 1 are the thickness axis Z direction of the electronic device 1 in FIG. 2 .

It can be understood that the protective layer 100 may include a plastic film, a tempered film, and/or various other film layers that are attached by the user during actual use, and the upper surface 101 of the protective layer 100 is used for biometric detection. Surfaces that are in direct contact with external objects. The upper surface 101 of the protective layer 100 is the outermost surface of the optical detection device 10 , or the upper surface 101 is the outermost surface of the electronic device 1 including the optical detection device 10 . In this application, the external object is, for example, but not limited to, a finger, the biometric detection is fingerprint feature detection, and the optical detection device 10 may be an off-screen fingerprint identification device.

The display module 104 is located under the protective layer 100 at a position opposite to the transparent area 220 . Optionally, in some embodiments, the display module 104 is, for example, but not limited to, a passive light-emitting display module such as a liquid crystal display module or an electronic paper display module, and the display device 12 is correspondingly, for example, but not limited to It is a liquid crystal display device or liquid crystal display. The display module 104 includes a display panel 105 and a backlight module 106. The display panel 105 is located under the protective layer 100 at a position opposite to the transparent area 220 . The backlight module 106 is located below the display panel 105 . The backlight module 106 is used for providing a backlight beam to the display panel 105, and the backlight beam is a visible light beam. The display panel 105 uses the backlight beam to display text information or image information and other pictures.

Generally, an area of the display panel 105 for displaying images is defined as a display area (not marked), and an area around the display area that cannot display images is a non-display area (not marked). In the present application, the transparent area 220 faces the display area, and the orthographic projection of the transparent area 220 on the display area is located in the display area or completely coincides with the display area. The non-transparent area 210 covers the non-display area and extends beyond the non-display area in a direction away from the non-display area. That is, the area of the non-transparent area 210 is larger than that of the non-display area. When the user uses the display device 12 , the display area that the user can actually see on the front of the display device 12 is the same size as the transparent area 220 .

Optionally, in some embodiments, the upper surface 101 of the protective layer 100 includes a top edge 107 and a bottom edge 108 oppositely disposed along the length axis Y of the electronic device 1 , the top edge 107 and the bottom edge 108 They are respectively arranged corresponding to the top 13 and the bottom 14 of the electronic device 1 . A line connecting the midpoint of the top edge 107 and the midpoint of the bottom edge 108 is defined as the long axis L of the upper surface 101 , and the long axis L is parallel to the long axis of the electronic device 1 Y. The non-transparent area 210 at least includes a first non-transparent area 2100 located at the bottom 14 of the electronic device 1 , and the first non-transparent area 2100 is a long and narrow area extending along the width axis X of the electronic device 1 in its length direction, The first non-transparent region 2100 is formed by extending the bottom edge 108 of the protective layer 100 toward the top edge 107 . In this embodiment, the detection light source 16 is located below the first non-transparent region 2100 of the protective layer 100 and is also located at the side of the display module 104 .

The detection module 19 has a field of view (Field of View, FOV), and the detection light 11 returned by an external object within the field of view can be received by the detection module 19 and converted into an electrical signal to obtain a corresponding signal. detection information, the detection information includes but is not limited to fingerprint images. For example, in this embodiment, the first detection information may be a first fingerprint image formed by the fingerprint of the finger under the irradiation of the first detection light 110 . Correspondingly, the second detection information may be a second fingerprint image formed by the fingerprint of the finger under the irradiation of the second detection light 112 .

The portion of the upper surface 101 of the protective layer 100 located within the viewing angle range of the detection module 19 is the viewing area VA. Optionally, in some embodiments, the detection module 19 includes a lens module (not shown) and an image sensor (not shown), and the detection light 11 is converted into electricity by the image sensor after passing through the lens module. Signal. The lens module has an optical center, and the angle of view with the optical center as a vertex is, for example, but not limited to: 100 degrees-140 degrees, or 120 degrees-130 degrees. Optionally, the thickness of the detection module 19 is, for example, but not limited to, 1 to 2 mm, or 2 to 3 mm, or 3 to 4 mm.

It should be noted that, unless otherwise specified, the field of view of the detection module 19 described in this application may be the field of view of the XZ plane, the field of view of the YZ plane, or the imaging optical path of the detection module 19 other possible planes or orientations within the field of view. It can be understood that the viewing angle of the detection module 19 has a corresponding viewing angle range in space, and the viewing angle range of the detection module 19 can be at least part of a cone, or other possible three-dimensional shape.

Optionally, in some embodiments, the center point of the field of view area VA is located on or close to the long axis L. The field of view area VA is close to the bottom edge 108 of the upper surface 101 , and the interval between the center of the field of view area VA and the bottom edge 108 of the upper surface 101 of the protective layer 100 ranges from 10 to 20 Millimeters (mm), or 15 to 25 mm, or 20 to 30 mm.

In this embodiment, the detection module 19 is disposed below the backlight module 106 and below the transparent area 220 of the protective layer 100 and the display area of the display panel 105 . The orthographic projection of the detection module 19 on the upper surface 101 is located within the field of view area VA, and the area of the orthographic projection is smaller than the area of the field of view area VA. The detection light 11 returned by the external object passes through the protective layer 100 , the display panel 105 , and the backlight module 106 and is received by the detection module 19 .

Optionally, in some embodiments, the detection module 19 is disposed inside the display panel 105 . For example, the detection module 19 may be a photosensitive element (not shown) disposed in a display pixel (not shown) of the display panel 105 , and the detection light 11 returned by the external object passes through the protective layer 100 and part of the display panel 105 are then received by the photosensitive element to realize corresponding sensing. It can be understood that, the detection module 19 may also be disposed at other suitable positions of the optical sensing device 10 , which is not limited in this application.

The detection light source 16 is used to emit detection light 11 to the external object, the detection light 11 returned by the external object carries the biometric information of the external object, and the detection light 11 returned by the external object passes through the protection Layer 100 and at least a portion of display module 104 are received by said detection module 19 . The way that the detection light 11 returns through the external object includes, but is not limited to, the detection light 11 first enters the interior of the external object and then transmits and returns; The position where the object is in contact with the protective layer 100 is diffusely reflected and returned; or, the detection light 11 is transmitted through the protective layer 100 and then reflected by an external object and then returned. In this embodiment, the external object is the user's finger, and the detection light 11 returned via the finger carries fingerprint feature information of the finger. After passing through the protective layer 100, the detection light 11 first enters the inside of the finger and propagates, and then transmits from the surface of the finger with fingerprint lines and returns to the detection module 19 for reception.

Optionally, in some embodiments, the detection light source 16 is closer to the bottom 14 of the electronic device 1 than the detection module 19 is, and the horizontal distance between the detection module 19 and the detection light source 16 10mm to 20mm.

Optionally, in some embodiments, the detection light 11 is invisible light, such as but not limited to near-infrared light. The wavelength range of the near-infrared light is 750 nanometers (nm) to 2000 nm. For example, the detection light 11 is near-infrared light with a wavelength of 800 nm˜1200 nm.

Optionally, in some embodiments, the detection light source 16 includes a first detection light source 161 and a second detection light source 162 . The first detection light source 161 and the second detection light source 162 are arranged at intervals along the width axis X of the electronic device 1, and are respectively located at different orientations of the field of view area VA. The first detection light source 161 is closer to the left side 17 of the electronic device 1 , and the second detection light source 162 is closer to the right side 18 of the electronic device 1 . The first detection light source 161 is used to project the first detection light 110 . The second detection light source 162 is used to project the second detection light 112 . The orthographic projection of the first detection light source 161 on the upper surface 101 of the protective layer 100 and the orthographic projection of the second detection light source 162 on the upper surface 101 of the protective layer 100 are axes with respect to the long axis L of the upper surface 101 of the protective layer 100 symmetrical distribution. The distance between the orthographic projection of the first detection light source 161 on the upper surface 101 of the protective layer 100 and the orthographic projection of the second detection light source 162 on the upper surface 101 of the protective layer 100 ranges from 10 mm to 25 mm. The distance between the orthographic projection of the detection light source 161 on the upper surface 101 of the protective layer 100 and the orthographic projection of the second detection light source 162 on the upper surface 101 of the protective layer 100 is, for example, 10 mm, 12 mm, 16 mm, 20 mm, or 25 mm. In some embodiments, the distance between two orthographic projections is defined as the distance between the lines connecting the closest points to each other on the respective boundaries of the two orthographic projections. It can be understood that, in other or modified embodiments, the distance between the two orthographic projections may also have other definitions, such as the horizontal distance between the points closest to each other on the respective boundaries of the two orthographic projections, as long as the distance between the two orthographic projections is evaluated. The definitions used for the same type of positional relationship can be consistent.

In this embodiment, the first detection light source 161 and the second detection light source 162 are both located below the first non-transparent region 2100 of the protective layer 100 . The first detection light source 161 and the second detection light source 162 are both located on the same horizontal plane that is substantially parallel to the upper surface 101 of the protective layer 100 , so the value of the distance between the first detection light source 161 and the second detection light source 162 The range is also 10 millimeters (mm) to 25 mm, and the distance between the first detection light source 161 and the second detection light source 162 is, for example, 10 mm, 12 mm, 16 mm, 20 mm, or 25 mm.

The first detection light source 161 has a first connection line 61 formed between the orthographic projection of the upper surface 101 of the protective layer 100 and the center of the field of view area VA, and the second detection light source 162 is formed on the upper surface 101 of the protective layer 100 A second connecting line 62 is formed between the orthographic projection of , and the center of the field of view area VA, and the angle formed between the first connecting line 61 and the second connecting line 62 ranges from 45 degrees to 95 degrees. , 60 degrees to 115 degrees, or 80 degrees to 120 degrees. The angle of the included angle formed between the first connection line 61 and the second connection line 62 is, for example, 50 degrees, 60 degrees, 75 degrees, 90 degrees, or 105 degrees. The first connection line 61 and the second connection line 62 may be equal or unequal. In some embodiments, the line connecting the orthographic projection and the center of the field of view area VA is defined as the distance between the point closest to the center of the field of view area VA on the boundary of the orthographic projection and the center of the field of view area VA connect. It can be understood that, in other or modified embodiments, the connection line between the orthographic projection and the center of the field of view area VA may also have other reasonable definitions, as long as the definition used in evaluating the same type of positional relationship is maintained before and after. For example, but not limited to: if the orthographic projections of the first detection light source 161 and the second detection light source 162 on the upper surface of the protective layer 100 are regular figures, the orthographic projections have a center point, and the orthographic projections The line between the projection and the center of the field of view area VA may also be defined as the line between the center point of the orthographic projection and the center of the field of view area VA.

A third connection line 63 is formed between the orthographic projection of the first detection light source 161 on the upper surface 101 of the protective layer 100 and the orthographic projection of the second detection light source 162 on the upper surface 101 of the protective layer 100 . The third connection line 63 The midpoint of is also located on or close to the long axis L of the upper surface 101 of the protective layer 100 . Optionally, in some embodiments, the distance between the center of the field of view area VA and the midpoint of the third connecting line 63 ranges from 10 mm to 20 mm. The distance between the center of the field of view area VA and the midpoint of the third connecting line 63 is, for example, 10 mm, 12 mm, 14 mm, 18 mm, or 20 mm. In some embodiments, a line between two orthographic projections is defined as a line between the points closest to each other on the respective boundaries of the two orthographic projections. It can be understood that, in other or modified embodiments, the connection between the two orthographic projections may also have other reasonable definitions, as long as the definitions used when evaluating the same type of positional relationship can be consistent before and after.

Optionally, in some embodiments, the light-emitting surface of the first detection light source 161 and the light-emitting surface of the second detection light source 162 are both parallel or substantially parallel to the upper surface 101 of the protective layer 100 . The light-emitting surfaces of the first detection light source 161 and the second detection light source 162 may be in close contact with the lower surface 102 of the protective layer 100 or the optical film layer 122 disposed on the lower surface 102 . The light-emitting surfaces of the first detection light source 161 and the second detection light source 162 may also be spaced from the lower surface 102 of the protective layer 100 or the optical film layer 122 disposed on the lower surface 102. The interval between the light emitting surfaces of the first detection light source 161 and the second detection light source 162 and the lower surface 102 of the protective layer 100 or the optical film layer 122 ranges from 2 mm to 10 mm.

Optionally, in other or modified embodiments, the light emitting surfaces of the first detection light source 161 and the second detection light source 162 may also be inclined to the upper surface 101 of the protective layer 100 and face the field of view area VA on the side.

Optionally, as shown in FIGS. 3 and 4 , in some embodiments, the first detection light source 161 includes one or more first light-emitting units 1601 . The second detection light source 162 includes one or more second light emitting units 1602 . The first light-emitting unit 1601 is used for projecting the first detection light 110 . The second light-emitting unit 1602 is used for projecting the second detection light 112 . If the first detection light source 161 includes a plurality of first light-emitting units 1601, the orthographic projection of the first detection light source 161 is the sum of the orthographic projections of the plurality of first light-emitting units 1601 on the upper surface 101, or can be An area covering all orthographic projections of the plurality of first light emitting units 1601 . If the second detection light source 162 includes a plurality of second light-emitting units 1602, the orthographic projection of the second detection light source 162 is the sum of the orthographic projections of the plurality of second light-emitting units 1602 on the upper surface 101, or can be An area covering all the orthographic projections of the plurality of second light emitting units 1602 . The aforementioned distance between the first detection light source 161 and the second detection light source 162 is the distance between the adjacent first light-emitting units 1601 and the second light-emitting units 1602 . If the first detection light source 161 and the second detection light source 162 respectively include a plurality of first lighting units 1601 and second lighting units 1602, the power requirements for each of the first lighting unit 1601 and the second lighting unit 1602 may be appropriate If it is lowered, the first light-emitting unit 1601 and the second light-emitting unit 1602 can be thinner, and it is easier to meet strict space requirements.

The first light-emitting unit 1601 and the second light-emitting unit 1602 have a preset light-emitting angle, and the light-emitting angle is the maximum angle range that the first light-emitting unit 1601 and the second light-emitting unit 1602 can emit the detection light 11 . Optionally, in some embodiments, the variation range of the light-emitting angles of the first light-emitting unit 1601 and the second light-emitting unit 1602 is 90 degrees to 160 degrees. The light-emitting angle of the first light-emitting unit 1601 and the second light-emitting unit 1602 may be, for example, 90 degrees, 120 degrees, or 140 degrees.

The area on the upper surface 101 of the protective layer 100 that can be irradiated by the detection light source 16 is defined as the illumination area P of the detection light source 16 , and the detection light 11 emitted by the detection light source 16 is emitted from the illumination area P of the upper surface 101 . to the external object. It can be understood that the illumination area P of the first detection light source 161 is the sum of the illumination areas P of the included one or more first light-emitting units 1601 , and the illumination area P of the second detection light source 162 includes The sum of the illumination areas P of one or more of the second light emitting units 1602.

Optionally, in some embodiments, the irradiation area P and the field of view area VA do not overlap. Specifically, a part of the boundary of the irradiation area P may overlap with a part of the boundary of the field of view area VA, that is, the irradiation area P and the field of view area VA are circumscribed to each other. Optionally, in other or modified embodiments, the irradiation area P and the field of view area VA may also be spaced apart from each other.

Each layer structure through which the detection light 11 emitted by the detection light source 16 is irradiated upward to an external object, including but not limited to the protective layer 100, will reflect a part of the detection light 11 downward, and this part of the detection light 11 For stray light not returned by external objects. The stray light does not carry the biometric information of the external object, and if it is received by the detection module 19, it will form background noise, thereby causing interference to the detection. If there is an overlapping area between the illumination area P and the field of view area VA, the stray light will be reflected back to the detection module 19 in the overlapping area. Therefore, in this embodiment, setting the irradiation area P and the field of view area VA to not overlap can effectively reduce the stray light generated by the detection light 11 in the process of irradiating an external object, which is beneficial to improve the The signal-to-noise ratio of the optical detection device 10.

In other or modified embodiments, within the allowable background noise range, the illumination area P may also partially overlap with the field of view area VA, and the overlapping area is defined as an overlapping area. In order to control the background noise caused by the overlapping of the illumination area P and the field of view area VA, the proportion of the overlapping area should be reduced as much as possible. For example, the area of the overlapping area S is not larger than 5%, 10%, 20%, or 30% of the area of the field of view area VA.

Optionally, in some embodiments, the first light-emitting unit 1601 and the second light-emitting unit 1602 are, for example, but not limited to, LED (light emitting diode), LD (laser diode), VCSEL (vertical cavity surface emitting laser), Mini - A combination of one or more of LED, Micro-LED, OLED (organic light emitting diode), and QLED (quantum dot light emitting diode).

Optionally, in some embodiments, a plurality of the first light-emitting units 1601 are arranged at equal intervals along the width axis X of the electronic device 1, and adjacent first light-emitting units 1601 are equally spaced. Values range from 0.5mm to 1.5mm. The plurality of second light-emitting units 1602 are arranged at equal intervals along the width axis X of the electronic device 1, and adjacent first light-emitting units 1601 are equally spaced, and the value ranges from 0.5mm to 1.5mm. The interval between adjacent second light emitting units 1602 may be equal to the interval between adjacent first light emitting units 1601, and the interval between adjacent second light emitting units 1602 may not be equal to the interval between adjacent first light emitting units interval between 1601. The interval between adjacent first light emitting units 1601 and the interval between adjacent second light emitting units 1602 are both far smaller than the interval between the first light emitting light source 161 and the second light emitting light source 162 .

It can be understood that, in other or modified embodiments, the intervals between adjacent first light emitting units 1601 may not be equal. Alternatively, the intervals between adjacent second light emitting units 1602 may also be unequal.

Optionally, as shown in FIG. 3 , in some embodiments, the first detection light source 161 includes three first light emitting units 1601 , and the second detection light source 162 includes three second light emitting units 1602 . The distance between the first detection light source 161 and the second detection light source is, for example, 12 mm. When the number of light-emitting units 1601 and 1602 included in the first detection light source 161 and the second detection light source 162 is large, for example, the number is 3 or more, the first detection light source 161 and the second detection light source The intensity of the detection light 11 emitted by 162 will increase and the range of the area that can be irradiated will also increase accordingly. Therefore, corresponding to different pressing gestures of the finger during detection, for example, as shown in FIG. 3 , the finger presses the field of view area VA laterally along the width axis X of the electronic device 1, there is enough detection light 11 to return to the Detection module 19 for effective detection.

Optionally, as shown in FIG. 4 , in some embodiments, the first detection light source 161 includes two first light emitting units 1601 , and the second detection light source 162 includes two second light emitting units 1602 . The distance between the first detection light source 161 and the second detection light source 162 is, for example, 10 mm.

It can be understood that, if the number of light-emitting units 1601 and 1602 included in the first detection light source 161 and the second detection light source 162 is larger, the distance between the first detection light source 161 and the second detection light source 162 will be higher. The spacing can also be relatively larger.

As shown in FIG. 2 , the finger print 1000 has ridges 1100 and valleys 1200 . During fingerprint detection, the user touches the upper surface 101 of the protective layer 100 with a finger, the ridges 1100 are in contact with the upper surface 101 , and the valleys 1200 are not in contact with the upper surface 101 . The detection light 11 is emitted from the irradiation area P of the upper surface 101 and then projected into the finger, and propagates toward the field of view area VA inside the finger, and contacts the field of view area VA of the upper surface 101 from the fingerprint 1000 The part of the finger is transmitted back to the detection module 19 .

Viewed from the inside of the finger along the projection direction of the detection light 11, the ridge 1100 is in contact with the upper surface 101 of the protective layer 100, and the valley 1200 is convex. When the detection light 11 is projected from a certain direction , the raised valleys 1200 will form shadows at the ridges 1100 on the backlight side, and the shadows can enhance the contrast of the light and dark stripes corresponding to the ridges 1100 and valleys 1200 in the acquired fingerprint image, which is conducive to obtaining clear fingerprint details , to improve the recognition rate of the acquired fingerprint image for fingerprint identification. However, the above-mentioned shadow imaging principle can only obtain a clear fingerprint image in a small fingerprint pattern area closest to the direction of incoming light. Although the details of the fingerprint image are clear, the number is usually relatively small, so it is necessary to project from different directions. Detect light 11 to obtain clear fingerprint images of other parts of the finger.

Please refer to Fig. 1, Fig. 2, Fig. 5a-Fig. 5b together. In order to briefly and clearly describe the shadow imaging in the fingerprint image obtained when the detection light 11 is projected to the finger from different directions, Fig. 5a-Fig. 5b will The fingerprint pattern 2000 formed by the contact between the finger and the field of view area VA is simplified to a first fingerprint pattern 2100 and a second fingerprint pattern 2200 whose pattern directions are perpendicular to each other. The dark lines in the fingerprint pattern 2000 correspond to the valleys 1100 that are not in contact with the upper surface 101 of the protective layer 100, and the bright lines between adjacent dark lines correspond to the ridges 1200 that are in contact with the upper surface 101 of the protective layer 100.

The shadows formed by the valley 1200 will also be different for the detection light 11 projected from different directions. For example, when the projection direction of the detection light 11 is perpendicular to the direction of the fingerprint pattern 2000, the shadow formed by the valley 1200 is more obvious. The corresponding fingerprint pattern 2000 in the acquired fingerprint image has a high contrast between light and dark. When the projection direction of the detection light 11 is parallel to the direction of the fingerprint pattern 2000 , the valley 1200 cannot form a shadow, and the fingerprint image formed by the corresponding part of the fingerprint pattern 2000 cannot be used for identification because the contrast between light and dark is too low. For the detection light 11 whose projection direction and the direction of the fingerprint pattern 2000 are between vertical and parallel, the larger the angle between the projection direction and the direction of the fingerprint pattern 2000 is, the larger the shadow corresponding to the valley 1200 is. Obviously, the higher the contrast of the fingerprint pattern 2000 in the acquired fingerprint image is.

Optionally, in some embodiments, the portion of the fingerprint image where the brightness difference between the light and dark stripes formed corresponding to the ridges 1100 and the valleys 1200 is more than 4% has clearer details, and the recognition rate when used for fingerprint recognition is relatively high. . In the fingerprint image, some details where the brightness difference between the light and dark stripes formed corresponding to the ridges 1100 and the valleys 1200 is less than or equal to 4% are relatively blurred, and the recognition rate when used for fingerprint recognition is relatively low.

FIG. 5a shows the situation when the first detection light source 161 near the left side 17 of the electronic device 1 projects the first detection light 110 toward the fingerprint pattern 2000, and the second detection light source 162 near the right side 18 of the electronic device 1 does not emit light Shadow imaging of fingerprint pattern 2000. The main part of the first detection light 110 emitted by the first detection light source 161 after entering the inside of the finger illuminates the first fingerprint pattern 2100 in a direction substantially perpendicular to the first fingerprint pattern 2100, so it will be in the first fingerprint pattern. A fingerprint pattern 2100 has obvious shadows formed on the backlight side. The main part of the first detection light 110 after entering the inside of the finger illuminates the second fingerprint pattern 2200 in a direction substantially parallel to the second fingerprint pattern 2200, so the second set of fingerprint patterns 2200 does not form a shadow Or the shadow formed is not obvious. Therefore, in the case where the first detection light source 161 illuminates the fingerprint pattern 2000 and the second detection light source 162 does not emit light, the fingerprint image obtained by the detection module 19 corresponds to the first fingerprint pattern 2100 The part has high contrast, for example: the brightness difference between light and dark stripes is greater than 4%, which is a clear part of the fingerprint image, and the part corresponding to the second fingerprint pattern 2200 has low contrast, for example: the brightness difference between light and dark stripes is less than 4% , which is the blurred part of the fingerprint image. The clear part of the fingerprint image can be used for fingerprint identification, while the fuzzy part of the fingerprint image cannot be used for effective fingerprint identification.

FIG. 5b shows the situation when the second detection light source 162 near the right side 18 of the electronic device 1 projects the second detection light 112 toward the fingerprint pattern 2000, and the first detection light source 161 near the left side 17 of the electronic device 1 does not emit light Shadow imaging of fingerprint pattern 2000. The main part of the second detection light 112 emitted by the second detection light source 162 after entering the inside of the finger illuminates the second fingerprint texture 2200 in a direction substantially perpendicular to the second fingerprint texture Obvious shadows are formed on the backlight side of the two fingerprint patterns 2200 . The main part of the second detection light 112 after entering the inside of the finger illuminates the first fingerprint pattern 2100 in a direction substantially parallel to the first fingerprint pattern 2100, so the first set of fingerprint patterns 2100 does not form a shadow Or the shadow formed is not obvious. Therefore, in the case where the second detection light source 162 illuminates the fingerprint pattern 2000 and the first detection light source 161 does not emit light, in the fingerprint image acquired by the detection module 19, the fingerprint pattern corresponding to the second fingerprint pattern 2200 is The part has high contrast, for example: the brightness difference between light and dark stripes is greater than 4%, which is a clear part of the fingerprint image, and the part corresponding to the first fingerprint pattern 2100 has low contrast, for example: the brightness difference between light and dark stripes is less than 4% , which is the blurred part of the fingerprint image. The clear part of the fingerprint image can be used for fingerprint identification, while the fuzzy part of the fingerprint image cannot be used for effective fingerprint identification.

It can be seen from the above that from the different fingerprint images obtained by projecting the first detection light 110 and the second detection light 112 in different directions of the finger respectively, the respective clear parts and blurred parts have better complementarity, which is beneficial to A clear image of a larger range of fingerprint lines 2000 is obtained for subsequent fingerprint identification.

It can be understood that the detection rays 11 projected from different directions should not be projected at the same time period, otherwise the shadow of the fingerprint pattern 2000 formed by the detection rays 11 projected from one direction will be cast by the detection rays 11 projected from the other direction. Attenuate or dissipate, thereby reducing the light-dark contrast of the obtained shadow image of the fingerprint pattern 2000 . Therefore, for the light-emitting units 160 that project the detection light 11 from different directions, the projections need to be performed in different time periods respectively.

As shown in FIG. 6 , FIG. 6 is a schematic diagram of a control circuit of the detection light source 16 of the optical detection device 10 shown in FIGS. 1 and 2 . The optical detection device 10 further includes a controller 1500 , a first driving circuit 1501 , and a second driving circuit 1502 . The controller 1500 is connected to the first driving circuit 1501 and the second driving circuit 1502 respectively. The first driving circuit 1501 is respectively connected to the first light-emitting unit 1601 of the first detection light source 161 and the second light-emitting unit 1602 of the second detection light source 162 for driving the first light-emitting unit 1601 or the second light-emitting unit 1602 A detection light 11 is emitted. When performing fingerprint detection, under the control of the controller 1500, the first driving circuit 1501 is used to drive the first light emitting unit 1601 of the first detection light source 161 to project the first detection light 110 to the fingerprint of the finger during a first period of time 1000. Under the control of the controller 1500, the first driving circuit 1501 is configured to drive the second light-emitting unit 1602 of the second detection light source 162 to project the second detection light 112 to the fingerprint 1000 during the second period.

The second driving circuit 1502 is connected to the detection module 19 . When performing fingerprint detection, the second driving circuit 1502, under the control of the controller 1500, is used to drive the detection module 19 to receive the first detection light 110 returned by the finger fingerprint 1000 in a first period of time, so as to obtain the finger The corresponding first fingerprint image of the fingerprint 1000 is illuminated by the first detection light 110 . The second driving circuit 1502, under the control of the controller 1500, is used to drive the detection module 19 to receive the second detection light 112 returned by the fingerprint 1000 during the second period, so as to obtain the fingerprint 1000 in the second detection. The corresponding second fingerprint image is illuminated by the light 112 .

It can be known from the previous discussion that the clear part and the blurred part in the first fingerprint image are different from the clear part and the blurred part of the second fingerprint image. When the first fingerprint image and the second fingerprint image are used for fingerprint identification, the clear part of the first fingerprint image and the clear part of the second fingerprint image can respectively provide different fingerprint feature points for fingerprint identification. The first fingerprint image and the second fingerprint image can be used for fingerprint recognition separately, or can be used for fingerprint recognition together, or the first fingerprint image and the second fingerprint image can be combined into a clear part with higher integrity. A fingerprint image is then used for fingerprint recognition.

The first time period and the second time period are time periods that occur at different times, respectively. The durations of the first period and the second period can be adjusted according to the exposure time of the detection module 19, for example, 10 milliseconds (ms), 20 ms, 30 ms, or 40 ms. The durations of the first period and the second period may or may not be equal.

Optionally, in some embodiments, as shown in FIG. 2 , the optical detection device 10 further includes a support frame 15 . The support frame 15 is used for carrying the protective layer 100 , the display module 104 , the detection light source 16 or/and the detection module 19 . The protective layer 100, the display module 104, the detection light source 16 or/and the detection module 19 can be connected to the support by means of glue, double-sided tape, adhesive, bolts, brackets, buckles, slots, welding, etc. The frame 15 is either fixedly connected or detachably connected. The support frame 15 includes a bottom plate 150 and a side wall 152 . The bottom plate 150 is located under the protective layer 100 and the display module 104 to carry the display module 104. The sidewall 152 extends from the edge of the bottom plate 150 and is connected to the periphery of the protective layer 100 . The sidewall 152 includes an inner surface 154 , and the inner surface 154 is a side surface of the sidewall 152 facing the protective layer 100 and the display module 104 . The detection light source 16 can be fixedly connected or detachably connected to the inner surface 154 of the side wall 152 by means of glue, double-sided tape, adhesive, bolts, brackets, buckles, slots, welding, etc.

It can be understood that, in other or modified embodiments, the detection light source 16 may also be disposed on other structures of the optical detection device 10 , such as but not limited to: the display panel 105 or/and the backlight module 106 , as long as the detection light source 16 can transmit the detection light 11 through the protective layer 100 to the external object for detection.

Optionally, in some embodiments, the bottom plate 150 further has an opening 153 . The opening 153 is located below the transparent area 220 of the protective layer 100 and is substantially opposite to the field of view area VA. The detection module 19 is at least partially located below the bottom plate 150 of the support frame 15 . Optionally, the detection module 19 is at least partially fixed in the opening 153, or the detection module 19 is entirely located below the opening 153. The detection light 11 returned by the external object sequentially passes through the protective layer 100 , the display module 104 , and the opening 153 to reach the detection module 19 . Of course, in other embodiments, the detection module 19 can also be staggered from the opening 153 . For example and without limitation, in some modified or alternative embodiments of the optical detection device 10 that employ a periscope imaging structure.

In the embodiment of the present application, the electronic device 1 is, for example, a mobile phone, and the support frame 15 is a middle frame of the mobile phone.

As shown in FIG. 7 , FIG. 7 is a schematic front view of the optical detection device 20 provided in the second embodiment of the present application applied to the electronic device 2 . The structure of the optical detection device 20 of the second embodiment is substantially the same as the structure of the optical detection device 10 of the first embodiment, and the main difference is that the detection light source 26 further includes a third detection light source 263, so The third detection light source 263 is located between the first detection light source 261 and the second detection light source 262 , and the first detection light source 261 , the second detection light source 262 and the third detection light source 263 are along the width of the electronic device 2 Axis X arrangement. The third detection light source 263 is used to project the third detection light 213 to the fingerprint through the protective layer 100 . The third connection line 63 is formed between the orthographic projection of the first detection light source 261 on the upper surface 201 of the protective layer 200 and the orthographic projection of the second detection light source 262 on the upper surface 201 of the protective layer 200. The projection of the third detection light source 263 on the upper surface 201 of the protective layer 200 is located on the third connection line 63 . Optionally, in some embodiments, the projection of the third detection light source 263 on the upper surface 201 of the protective layer 200 is located in the middle of the third connection line 63 . It can be seen that the first detection light source 261, the second detection light source 262, and the third detection light source 263 are respectively located at different positions of the user's finger in contact with the field of view area VA, and the third detection light source 263 emits The projection direction of the third detection ray 213 is also different from the projection direction of the first detection ray 210 and the second detection ray 212 .

Please refer to FIG. 7 and FIG. 8 together, the first driving circuit 2501 is connected to the third detection light source 263 . When fingerprint detection is performed, the first driving circuit 2501, under the control of the controller 2000, is used to simultaneously drive the first detection light source 261 and the third detection light source 263 to project the first detection light 210 and The third detection light 213 is sent to the fingerprint of the finger for fingerprint detection. The first driving circuit 2501, under the control of the controller 2000, is used to simultaneously drive the second detection light source 262 and the third detection light source 263 to project the second detection light 212 and the third detection light 213 to the second time period. Fingerprint for fingerprint detection. The second driving circuit 2502, under the control of the controller 2000, is used to drive the detection module 29 to receive the first detection light 210 and the third detection light 213 returned by the fingerprint during the first period, so as to obtain the fingerprint of the finger. the corresponding first fingerprint image. The second driving circuit 2502, under the control of the controller 2000, is used to drive the detection module 29 to receive the second detection light 212 and the third detection light 213 returned by the fingerprint during the second period, so as to obtain the fingerprint of the finger. the corresponding second fingerprint image.

It can be understood that, if the distance between the first detection light source 261 and the second detection light source 262 is relatively far, the fingerprints of the fingers irradiated by the first detection light source 261 or the second detection light source 262 when they are illuminated separately. Part of the brightness will be insufficient, which is not conducive to obtaining a clear fingerprint image. Therefore, the third detection light source 263 disposed between the first detection light source 261 and the second detection light source 262 can be used to supplement the overall brightness of the first detection light source 261 and the second detection light source 262 when the finger fingerprints are respectively illuminated , which is beneficial to obtain a clear fingerprint image.

In addition, the projection direction of the first detection light 210 and the projection direction of the second detection light 220 are quite different. If the first detection light 210 and the second detection light 212 are projected at the same time, they will weaken or cancel each other. Shadows from finger prints 2000. However, the projection direction of the third detection light 213 is slightly different from the projection direction of the first detection light 210 and the projection direction of the second detection light 220 . The effect of the shadow of the fingerprint 2000 formed is small, and the projection of the third detection light 213 can also form a part of the shadow that would not be generated under the original projection of the first detection light 210, increasing the corresponding acquired first fingerprint image. clear part. Therefore, the third detection light source 263 and the first detection light source 261 can simultaneously project the detection light 21 within the first period of time, so as to obtain the first fingerprint image with better quality. Based on the same reason, the third detection light source 263 and the second detection light source 262 may simultaneously project the detection light 21 during the second period of time, so as to obtain a second fingerprint image with better quality.

Optionally, in some embodiments, the third detection light source 263 includes one or more third light-emitting units 2603, the first driving circuit 2501 is respectively connected to the third light-emitting units 2603, and the first The driving circuit 2501 is used for driving the third light-emitting unit 2603 to project the third detection light 213 . If the third detection light source 263 includes a plurality of third light-emitting units 2603, at least one of the third light-emitting units 2603 and the first detection light source 261 simultaneously project the detection light 21 to the fingerprint during the first period of time. At least one of the third light-emitting unit 2603 and the second detection light source 262 simultaneously project the detection light 21 to the fingerprint during the second period.

Specifically, one or more first lighting units 2601 of the first detection light source 261 and one or more third lighting units 2603 of the third detection light source 263 constitute a first lighting combination 2610 . It can be seen from this that the first light-emitting combination 2610 includes a plurality of light-emitting units. When fingerprint detection is performed, the first driving circuit 2501, under the control of the controller 2000, is used to drive the first light-emitting unit 2601 and the third light-emitting unit 2603 in the first light-emitting combination 2610 to project light respectively during a first period of time. The first detection light 210 and the third detection light 213 reach the fingerprint of the finger. The second driving circuit 2502, under the control of the controller 2000, is used to drive the detection module 29 to receive the first detection light 210 and the third detection light 213 returned by the fingerprint during the first period, so as to obtain the The corresponding first fingerprint image of the fingerprint of the finger is illuminated by the first detection light 210 and the third detection light 213 .

One or more second lighting units 2602 of the second detection light source 262 and one or more third lighting units 2603 of the third detection light source 263 constitute a second lighting combination 2620. It can be seen from this that the second light-emitting combination 2620 includes a plurality of light-emitting units. When fingerprint detection is performed, the first driving circuit 2501, under the control of the controller 2000, is used to drive the second light-emitting unit 2602 and the third light-emitting unit 2603 in the second light-emitting combination 2620 to project, respectively, in a second period of time The second detection light 212 and the third detection light 213 reach the fingerprint of the finger. The second driving circuit 2502, under the control of the controller 2000, is used to drive the detection module 29 to receive the second detection light 212 and the third detection light 213 returned by the fingerprint during the second period, so as to obtain the A corresponding second fingerprint image of the fingerprint of the finger is illuminated by the second detection light 212 and the third detection light 213 .

Optionally, in some embodiments, there is an equal first interval L1 between adjacent first light-emitting units 2601 in the first light-emitting combination 2610, and adjacent first light-emitting units 2601 and third light-emitting units 2603 The interval between them is defined as a second interval L2, and the second interval L2 is not equal to the first interval L1, for example, the second interval L2 is greater than the first interval L1. Therefore, the plurality of light-emitting units in the first light-emitting combination 2610 are arranged at unequal intervals, and two adjacent light-emitting units have at least two unequal intervals. The value range of the first interval L1 is 0.5 mm to 2 mm, and the first interval is, for example, 0.6 mm, 1 mm, 1.2 mm, 1.65 mm, 1.8 mm, or 2 mm. The value range of the second interval L2 is 8 mm to 12 mm, and the second interval L2 is, for example, 8 mm, 10 mm, or 12 mm.

Optionally, in other or modified embodiments, if the first light-emitting combination 2610 includes a plurality of third light-emitting units 2603, then adjacent third light-emitting units 2603 may also have equal third intervals ( Not shown), the third interval ranges from 0.5 mm to 2 mm, and the third interval is, for example, 0.6 mm, 1 mm, 1.2 mm, 1.65 mm, 1.8 mm, or 2 mm.

Optionally, in other or modified embodiments, the first intervals L1 between every two adjacent first light-emitting units 2601 in the first light-emitting combination 2610 may also be unequal to each other.

Optionally, in some embodiments, there is an equal fourth interval L4 between adjacent second light-emitting units 2602 in the second light-emitting combination 2620, and the distance between the adjacent second light-emitting units 2602 and the third light-emitting units is equal. The interval between is defined as a fifth interval L5, and the fifth interval L5 is not equal to the fourth interval L4, for example, the fifth interval L5 is greater than the fourth interval L4. Therefore, the plurality of light-emitting units in the second light-emitting combination 2620 are arranged at unequal intervals, and two adjacent light-emitting units have at least two unequal intervals. The value range of the fourth interval L4 is 0.5 mm to 2 mm, and the fourth interval L4 is, for example, 0.6 mm, 1 mm, 1.2 mm, 1.65 mm, 1.8 mm, or 2 mm. The value range of the fifth interval L5 is 8 mm to 12 mm, and the fifth interval L2 is, for example, 8 mm, 10 mm, or 12 mm.

Optionally, in other or modified embodiments, if the second light-emitting combination 2620 includes a plurality of third light-emitting units 2603, then every two adjacent third light-emitting units 2603 may also have an equal number of third light-emitting units 2603. Six intervals (not shown), the range of the sixth interval is 0.5mm to 2mm, and the sixth interval is, for example, 0.6mm, 1mm, 1.2mm, 1.65mm, 1.8mm, or 2mm.

Optionally, in other or modified embodiments, the fourth interval L4 between every two adjacent second light-emitting units 2602 in the second light-emitting combination 2620 may also be unequal to each other.

It can be understood that the first interval L1 and the fourth interval L4 may be equal or unequal. The second interval L2 and the fifth interval L5 may or may not be equal.

Optionally, in some embodiments, the detection modules 19 and 29 may further include a processor (not shown in the figure) and a memory (not shown in the figure), and the processor can obtain the user's Fingerprint information, such as but not limited to fingerprint images. Biometric information templates, such as but not limited to fingerprint image templates, are pre-stored in the memory. The processor can compare the acquired fingerprint image with a pre-stored fingerprint image template, thereby realizing fingerprint identification. Based on the above fingerprint recognition, the optical detection devices 10 and 20 provided in this application can be used for locking or unlocking electronic devices 1 and 2, online payment service verification, identity verification in financial systems or public security systems, and access verification in access control systems. and application scenarios.

The optical detection devices 10 and 20 of the present application are respectively provided with different detection light sources 16 and 26 in different directions compared to the field of view area VA, so as to illuminate the fingers in contact with the field of view areas VA and V2 from different directions in different time periods. For fingerprints, the contrast of the acquired fingerprint images can be enhanced by illuminating the shadows of the fingerprint lines formed, so as to improve the recognition rate of the fingerprint images used for fingerprint identification. In addition, corresponding to different fingerprint images obtained at different illumination angles, respective clear parts can complement each other, thereby increasing the proportion of clear parts in the fingerprint image that can be used for fingerprint identification.

The structures and positions of the protective layer 100 , the display module 104 , the detection light source 16 , the field of view area VA, etc. in the above-mentioned embodiments or modified embodiments and corresponding modified settings of the present application can also be applied to other embodiments disclosed in the present application. , the resulting embodiments and their replacements, modifications, combinations, splits, expansions, omissions, etc. all belong to the protection scope of the present application.

It should be noted that the light-emitting surface, light-incident surface, etc. that may appear in the description of this application may be actual solid surfaces or imaginary surfaces, which do not affect the realization of the technical solutions of this application, and belong to the scope of this application. In addition, "overlap", "coincidence" and "overlapping" that may appear in the description of this application should be understood as having the same meaning and can be replaced with each other.

It should be noted that those skilled in the art can understand that, without creative efforts, part or all of the embodiments of the present application, as well as some or all of the modifications, replacements, changes, splits, combinations, Expansion and the like should be considered to be covered by the inventive idea of utility model of the present application, and belong to the protection scope of the present application.

Any reference in this specification to "one embodiment," "an embodiment," "an 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 present application. The appearances of such phrases in various places in this specification are not necessarily all referring to the same embodiment. Additionally, when a particular feature or structure is described in conjunction 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 conjunction with other embodiments of those embodiments.

"Length", "width", "upper", "lower", "left", "right", "front", "rear", "back", "front", "vertical" may appear in the specification of this application "," "horizontal", "top", "bottom", "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and The description is simplified rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the application. Like numerals and letters refer to like items in the figures, so once an item is defined in one figure, no further definition and explanation are required in subsequent figures. Meanwhile, in the description of the present application, 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 this application, "plurality" or "plurality" means at least two or two, unless expressly and specifically defined otherwise. In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, "arrangement", "installation" and "connection" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrally connected; 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 the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. The terms used in the claims should not be construed to limit the utility model to the specific embodiments disclosed in this specification. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims (16)

1. An optical inspection apparatus, comprising:

the protective layer comprises an upper surface and a lower surface which are oppositely arranged;

the display module is positioned below the protective layer and used for displaying pictures;

the detection module is positioned below the lower surface and provided with a preset field angle, and the part of the upper surface of the protective layer, which is positioned in the field angle range of the detection module, is defined as a field area of the detection module;

the first light-emitting combination is positioned below the lower surface and used for projecting detection light to an external object positioned above the protective layer in a first period; and

the second light-emitting combination is positioned below the lower surface and used for projecting detection light to an external object positioned above the protective layer in a second time period;

wherein the first light-emitting assembly comprises a plurality of light-emitting units, at least two different distances are provided between every two adjacent light-emitting units in the first light-emitting assembly, the second light-emitting assembly comprises a plurality of light-emitting units, at least two different distances are provided between every two adjacent light-emitting units in the second light-emitting assembly, at least part of detection light emitted by the first light-emitting assembly and at least part of detection light emitted by the second light-emitting assembly are respectively projected to the external object along different directions, the first time interval and the second time interval are respectively different time intervals, the detection module is used for receiving detection light returned in the field of view region by the external object in the first time interval to obtain corresponding first detection information, the detection module is used for receiving detection light returned in the field of view region by the external object in the second time interval to obtain corresponding second detection information, the first detection information or/and the second detection information is used for identification of the external object.

2. The optical inspection device of claim 1, wherein the first light-emitting assembly includes one or more first light-emitting units for projecting first inspection light and at least one third light-emitting unit for projecting third inspection light, adjacent first light-emitting units have an equal first spacing therebetween, adjacent first light-emitting units and third light-emitting units have a second spacing therebetween, the second spacing is greater than the first spacing, the second light-emitting assembly includes one or more second light-emitting units for projecting second inspection light and at least one third light-emitting unit for projecting third inspection light, adjacent second light-emitting units have an equal fourth spacing therebetween, adjacent second light-emitting units and third light-emitting units have a fifth spacing therebetween, and the fifth spacing is greater than the fourth spacing.

3. The optical inspection device of claim 2 wherein the first and fourth spacings range from 0.5mm to 2mm and the second and fifth spacings range from 8mm to 12 mm.

4. The optical detection device of claim 2, wherein the third light emitting unit in the first and second light emitting combinations is located between adjacent first and second light emitting units.

5. The optical detection device according to claim 4, wherein a distance between the first and second adjacent light emitting units ranges from 10mm to 25mm, and the third light emitting unit is located at an intermediate position between the first and second light emitting units.

6. The optical inspection device of claim 1, wherein the optical inspection device is applied to an electronic device having a length axis along a length direction of the electronic device and a width axis along a width direction of the electronic device, the top surface of the protection layer includes a top edge and a bottom edge oppositely disposed along the length axis of the electronic device, a line between a midpoint of the top edge and a midpoint of the bottom edge is defined as a long axis of the top surface, the center of the field of view is located on or near the long axis, and an orthographic projection of the first light-emitting combination on the top surface of the protection layer and an orthographic projection of the second light-emitting combination on the top surface of the protection layer are symmetrically distributed about the long axis.

7. The optical detection apparatus of claim 6, wherein the first and second light-emitting combinations are spaced along a width axis of the electronic device, wherein a side of the first light-emitting combination on which the third light-emitting unit is disposed and a side of the second light-emitting combination on which the third light-emitting unit is disposed are adjacent to each other, and wherein one or more of the first light-emitting units and one or more of the second light-emitting units are spaced along the width axis of the electronic device.

8. The optical inspection device of claim 1, wherein the protective layer has a transparent region and a non-transparent region connected to each other, the non-transparent region is located around or at an edge of the transparent region, the transparent region is configured to transmit visible light, the non-transparent region is configured to block visible light and transmit the inspection light, the first and second light-emitting assemblies are located below the non-transparent region of the protective layer, and the display module is located below the transparent region of the protective layer.

9. The optical inspection device as claimed in claim 1, wherein the display module is a passive-light-emitting display module, and comprises a display panel and a backlight module disposed below the display panel, the backlight module is configured to provide a backlight beam to the display panel, the backlight beam is a visible light beam, and the display panel displays a picture by using the backlight beam.

10. The optical inspection device of claim 1, further comprising a supporting frame for supporting the passivation layer, the display module, the first light emitting unit, the second light emitting unit, the third light emitting unit, or/and the inspection module, wherein the supporting frame comprises a bottom plate and a sidewall, the bottom plate is located below the passivation layer and the display module, the sidewall extends from an edge of the bottom plate and is connected to a periphery of the passivation layer, the sidewall comprises an inner surface facing the display module, and the first light emitting unit, the second light emitting unit, and the third light emitting unit are fixedly connected or detachably connected to the inner surface.

11. The optical inspection device of claim 1, wherein the external object is a finger, the inspection light passes through the protective layer and then enters the finger to propagate inside the finger, and then is transmitted from the surface of the finger with the fingerprint pattern and returned to the inspection module, the inspection light returned by the finger has the fingerprint feature information of the finger, and the first inspection information and the second inspection information obtained by the inspection light being converted by the inspection module are a first fingerprint image and a second fingerprint image, respectively.

12. The optical detection device according to claim 1, wherein light emitting surfaces of the first light emitting unit, the second light emitting unit, and the third light emitting unit are parallel to an upper surface of the protective layer.

13. The optical detection device according to claim 1, wherein the light emission angles of the first light emission unit, the second light emission unit, and the third light emission unit are varied in a range of 90 degrees to 160 degrees.

14. The optical inspection device of claim 1, wherein the first, second, or/and third light emitting units are one or more combinations of LEDs, LDs, VCSELs, Mini-LEDs, Micro-LEDs, OLEDs, QLEDs.

15. The optical inspection device according to claim 1, wherein an area of the upper surface of the protective layer to which the first and second light emission combinations are irradiated is defined as an irradiation area from which the first, second, and third detection lights are emitted to the external object, and the irradiation area and the field of view area do not overlap.

16. An electronic device, comprising the optical detection apparatus of any one of claims 1 to 15, wherein the upper surface of the protective layer is an outer surface of the electronic device.

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