CN111339815B

CN111339815B - Optical detection device and electronic equipment

Info

Publication number: CN111339815B
Application number: CN201911194360.9A
Authority: CN
Inventors: 朱文龙; 林峰
Original assignee: Shenzhen Fushi Technology Co Ltd
Current assignee: Beijing Taihua Heshun Technology Co.,Ltd.
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2024-11-19
Anticipated expiration: 2039-11-28
Also published as: CN111339815A

Abstract

The present application discloses an optical detection device, which includes: a protective layer, including an upper surface and a lower surface arranged opposite to each other; a detection module, located below the lower surface, the receiving module having a field of view area on the upper surface; and a first light-emitting combination and a second light-emitting combination located below part of the lower surface, used to project detection light in different directions to an external object located above the protective layer in a first time period and a second time 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, the detection module is used to receive detection light returned by an external object in the field of view area in the first time period to obtain corresponding first detection information, and the detection module is used to receive detection light returned by an external object in the field of view area in the second time period to obtain corresponding second detection information, and the first detection information and/or the second detection information are used for identifying the external object.

Description

Optical detection device and electronic equipment

Technical Field

The present application relates to the field of photoelectric technologies, and in particular, to an optical detection device and an electronic device.

Background

With the technical progress and the improvement of living standard of people, users are required to have more functions and fashionable appearance for electronic equipment such as mobile phones, tablet computers, cameras and the like. At present, electronic devices such as mobile phones and the like have the development trend of higher screen occupation ratio and the functions of fingerprint detection and the like. In order to achieve a full screen or near full screen effect, so that electronic devices have a high screen duty cycle, an under-screen fingerprint detection technique has been developed. However, for non-self-luminous displays such as liquid crystal display screens, there is no better under-screen detection scheme in the prior art.

Disclosure of Invention

In view of the above, the present application provides an optical detection device and an electronic apparatus capable of solving the problems of the prior art.

One aspect of the present application is an optical detection device 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 is used for displaying pictures;

The detection module is positioned below the lower surface, the detection module is 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;

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

A second light emitting assembly below the lower surface for projecting detection light to an external object above the protective layer during a second period of time;

The first light-emitting combination comprises a plurality of light-emitting units, at least two unequal intervals are arranged between every two adjacent light-emitting units in the first light-emitting combination, the second light-emitting combination comprises a plurality of light-emitting units, at least two unequal intervals are arranged between every two adjacent light-emitting units in the second light-emitting combination, at least part of detection light rays emitted by the first light-emitting combination and at least part of detection light rays emitted by the second light-emitting combination are respectively projected to the external object along different directions, the first time period and the second time period are respectively different time periods, the detection module is used for receiving detection light rays returned in a view field area through the external object in the first time period to obtain first detection information corresponding to the external object, and the detection module is used for receiving detection light rays returned in the view field area through the external object in the second time period to obtain second detection information corresponding to the external object, and 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 first detection light and at least one third light emitting unit for projecting third detection light, the adjacent first light emitting units have equal first intervals therebetween, the adjacent first light emitting units and third light emitting units have second intervals therebetween, the second intervals are greater than the first intervals, the second light emitting combination includes one or more second light emitting units for projecting second detection light and at least one third light emitting unit for projecting third detection light, the adjacent second light emitting units have equal fourth intervals therebetween, and the adjacent second light emitting units and third light emitting units have fifth intervals therebetween, the fifth intervals are greater than the fourth intervals.

In certain embodiments, the first and fourth intervals range from 0.5mm to 2mm in value and the second and fifth intervals range from 8mm to 12mm in value.

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

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

In some embodiments, the optical detection device is applied to an electronic device, the electronic device has a length axis along a length direction of the electronic device and a width axis along a width direction of the electronic device, the upper surface of the protective layer includes a top end edge and a bottom end edge that are disposed opposite to each other along the length axis of the electronic device, a line between a midpoint of the top end edge and a midpoint of the bottom end edge is defined as a long axis of the upper surface, a center of the field of view area is located on or near the long axis, and an orthographic projection of the upper surface of the protective layer of the second luminous combination are symmetrically distributed about the long axis.

In some embodiments, the first light emitting combination and the second light emitting combination are arranged at intervals 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 close to each other, and one or more of the first light emitting units and one or more of the second light emitting units are arranged at intervals along the width axis of the electronic device.

In some embodiments, the protective layer has a transparent region and a non-transparent region, the non-transparent region is located around or at an edge of the transparent region, the transparent region is used for transmitting visible light, the non-transparent region is used for shielding the visible light and transmitting the detection light, the first light-emitting combination and the second light-emitting combination 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.

In some embodiments, the display module is a passive light-emitting display module, and includes a display panel and a backlight module disposed below the display panel, where 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.

In some embodiments, the display device further comprises a support frame, wherein the support frame is used for bearing 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 comprises 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, the side wall 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 on the inner surface.

In some embodiments, the external object is a fingerprint, the detection light enters the finger to propagate after passing through the protective layer, then is transmitted out from the surface of the finger with fingerprint lines and returns to the detection module, the detection light returned by the finger has fingerprint characteristic information of the finger, and the first detection information and the second detection information obtained by converting the detection light by the detection module are respectively a first fingerprint image and a second fingerprint image.

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

In some embodiments, the light emitting angles of the first, second, and third light emitting units may range from 90 degrees to 160 degrees.

In some embodiments, the first, second, or/and third light emitting units may be one or more combinations of LED, LD, VCSEL, mini-LEDs, micro-LED, OLED, QLED.

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, the first detection light, the second detection light and the third detection light are emitted from the irradiation area to the finger, and the irradiation area and the field 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, where an upper surface of the protective layer is an outer surface of the electronic device.

The optical detection device has the beneficial effects that the detection light sources are respectively arranged at different positions relative to the view field area, external objects in contact with the view field area are respectively irradiated from different directions, and clear parts and fuzzy parts in different external object images obtained correspondingly can be mutually complemented, so that the recognition efficiency of the external objects is improved.

Drawings

FIG. 1 is a front view of an optical detection device according to a first embodiment of the present application applied to an electronic apparatus;

FIG. 2 is a schematic partial cross-sectional view of the optical detection device of FIG. 1 taken along line II-II;

FIG. 3 is a schematic diagram of an arrangement of light emitting units of the detection light source of the optical detection device shown in FIG. 1;

FIG. 4 is a schematic diagram of an arrangement of light emitting units of the detection light source of the optical detection device shown in FIG. 1;

FIGS. 5 a-5 b illustrate the formation of shadows of a fingerprint when the detection light source of the optical detection device of FIG. 1 irradiates simplified fingerprint patterns 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.

FIG. 7 is a front view of an optical detection device according to a second embodiment of the present application applied to an electronic apparatus;

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 Description

In the detailed description of embodiments of the 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 can be "directly" or "indirectly" on the other substrate, sheet, layer, or pattern, or one or more intervening layers may also be present. The thickness and size of each layer in the drawings of the specification may be exaggerated, omitted, or schematically represented for clarity. Moreover, the sizes of elements in the drawings do not entirely reflect actual sizes.

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, based on the embodiments of the application, which a person of ordinary skill in the art would achieve without inventive faculty, are within the scope of the application.

Further, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the application. It will be appreciated, however, by one skilled in the art that the inventive aspects may be practiced without one or more of the specific details, or with other structures, components, etc. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring aspects of the application.

Referring to fig. 1 to 2, fig. 1 is a schematic front view of an optical detection device 10 according to a first embodiment of the present application applied to an electronic apparatus 1, and fig. 2 is a schematic partial cross-sectional view of the optical detection device 10 along line II-II in fig. 1. The electronic apparatus 1 has a length axis in the own length direction Y, a width axis in the own width direction X, and a thickness axis in the own thickness direction Z. The electronic device 1 includes a top portion 13 and a bottom portion 14 disposed opposite to each other in the longitudinal direction Y thereof. The electronic device 1 is, for example, a mobile phone, and may include a sound tube 130, a front camera 132, and a sound sensor 140. The earpiece 130 and the front facing camera 132 may be arranged in a position of the electronic device 1 near the top 13. The sound sensor 140, for example: a microphone may be arranged in the electronic device 1 near the bottom 14. The electronic device 1 further comprises a first side 17 and a second side 18 arranged opposite along the width axis X. The first side 17 is a left side of the electronic device 1 and the second side 18 is a right side of the electronic device 1, as viewed from a front view of the electronic device 1 that is often used.

The optical detection device 10 is used for detecting characteristics of an external object, such as a fingerprint on a user's finger. The optical detection device 10 is not limited to the detection of fingerprints, but the detection object of the optical detection device 10 may be any external object that can be imaged. In the present application, the optical detection device 10 will be described by taking a finger print detection as an example. It will be appreciated that the skin surface texture of the palm, toes, and other areas may also be characteristic of the subject of the optical detection device 10 of the present application or of an external subject 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 disposed opposite to each other. The display module 104 is configured to display a picture, the display module 104 is located below the lower surface 102 of the protective layer 100, and the protective layer 100 is configured to protect the display module 104 from the external environment. The detection light source 16 is located below a part of the protection layer 100, and the detection light source 16 is configured to project detection light 11 to an external object located above the protection layer 100. The detection light 11 includes a first detection light 110 and a second detection light 112 respectively projected from different orientations toward 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 configured to receive, through the protective layer 100 and at least a portion of the display module 104, the detection light 11 returned through the external object, where the detection light 11 returned through the external object carries the biological characteristic information of the external object. The detection module 19 receives the first detection light 110 returned by the external object to obtain first detection information corresponding to 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 are planar; alternatively, the main body of the upper surface 101 and/or the lower surface 102 is a plane, and the edge portion located on the main body is a curved surface.

Optionally, in some embodiments, the protective layer 100 has a non-transparent region 210 and a transparent region 220 connected, the non-transparent region 210 being located around or at an edge of the transparent region 220. The transparent region 220 is for transmitting visible light, and the non-transparent region 210 is for blocking visible light and transmitting the detection light 11. The visible light beam emitted from the display module 104 exits to the outside of the display device 12 through the transparent area 220 to realize image display. The non-transparent region 210 is configured to block visible light such that a user does not see elements within the display device 12 in the non-transparent region 210. In an embodiment of the present application, the transmittance of the non-transparent area 210 for visible light is less than a preset threshold, for example: 10%, 5%, 1% and 0%. Of course, the transmittance of the non-transparent region 210 to the visible light beam is not limited to less than 10% as long as the internal element is not visible from the outside of the protective layer 100 through the non-transparent region 210. It can be understood that the main body of the protective layer 100 is a transparent substrate (not labeled), the protective layer 100 may implement the function of shielding visible light by the non-transparent region 210 by disposing the optical film layer 122 on the lower surface 102 of the portion of the transparent substrate located in the non-transparent region 210, the non-transparent region 210 of the protective layer 100 includes the optical film layer 122 and a portion of the transparent substrate opposite to the optical film layer 122, and the transparent region 220 of the protective layer 100 includes a portion of the transparent substrate not 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 material. The protective layer 100 may be a single layer structure or a multi-layer structure. The protective layer 100 is a thin plate having a predetermined length, width, and thickness, the length direction of the protective layer 100 is the length axis Y direction of the electronic device 1 in fig. 2, the width direction is the width axis X direction of the electronic device 1 in fig. 2, and the thickness direction is the thickness axis Z direction of the electronic device 1 in fig. 2.

It is understood that the protective layer 100 may include a plastic film, a toughened film, and/or other various film layers attached by a user in actual use, and the upper surface 101 of the protective layer 100 is a surface directly contacted by an external object in performing the biometric detection. The upper surface 101 of the protective layer 100 is the surface of the optical detection device 10 that is located at the outermost side, or the upper surface 101 is the outermost surface of the electronic apparatus 1 including the optical detection device 10. In the present 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 recognition device.

The display module 104 is located below the protective layer 100 and opposite to the transparent region 220. Alternatively, in some embodiments, the display module 104 is, for example and without limitation, 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, for example and without limitation, a liquid crystal display device or a liquid crystal display screen, respectively. 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 region 220. The backlight module 106 is located below the display panel 105. The backlight module 106 is configured to provide a backlight beam to the display panel 105, where the backlight beam is a visible light beam. The display panel 105 displays a screen such as text information or image information by using the backlight beam.

Generally, the area of the display panel 105 for displaying an image is defined as a display area (not shown), and the area around the display area where an image cannot be displayed is defined as a non-display area (not shown). In the present application, the transparent region 220 faces the display region, and the orthographic projection of the transparent region 220 on the display region is located in the display region or completely coincides with the display region. The non-transparent region 210 covers the non-display region and extends beyond the non-display region in a direction away from the non-display region. That is, the area of the non-transparent region 210 is larger than the area of the non-display region. When the user uses the display device 12, the display area actually viewable by the user on the front side 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 disposed opposite along the length axis Y of the electronic device 1, and the top edge 107 and the bottom edge 108 are disposed corresponding to the top 13 and the bottom 14 of the electronic device 1, respectively. A line between the midpoint of the top edge 107 and the midpoint of the bottom edge 108 is defined as a long axis L of the upper surface 101, the long axis L being parallel to the length axis Y of the electronic device 1. The non-transparent area 210 includes at least a first non-transparent area 2100 located at the bottom 14 of the electronic device 1, where the first non-transparent area 2100 is an elongated area extending along the width axis X of the electronic device 1 along its length direction, and the first non-transparent area 2100 is formed by extending from 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 area 2100 of the protection layer 100 and is also located at a side of the display module 104.

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

The portion of the upper surface 101 of the protective layer 100 located within the field angle range of the detection module 19 is a field area VA. Optionally, in some embodiments, the detecting module 19 includes a lens module (not shown) and an image sensor (not shown), and the detecting light 11 passes through the lens module and is converted into an electrical signal by the image sensor. 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 to 140 degrees, or 120 degrees to 130 degrees. Alternatively, the thickness of the detection module 19 is, for example and without limitation, 1 to 2 mm, or 2 to 3mm, or 3 to 4 mm.

It should be noted that, without being limited thereto, the field angle of the detection module 19 described in the present application may be the field angle of the XZ plane, the field angle of the YZ plane, or the field angle of other possible planes or directions in the imaging optical path of the detection module 19. It is understood that the field angle of the detection module 19 has a corresponding field angle range in space, and the field angle range of the detection module 19 may be at least part of a cone, or other possible three-dimensional shape.

Optionally, in some embodiments, a center point of the field of view area VA is located on or disposed near the long axis L. The field of view area VA is near 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 from 15 to 25mm, or from 20 to 30mm.

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

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 protection layer 100 and a part of the display panel 105 and is received by the photosensitive element to implement corresponding sensing. It will be appreciated that the detection module 19 may be disposed at other suitable positions of the optical sensing device 10, which is not limited in the present application.

The detection light source 16 is configured to emit detection light 11 to the external object, the detection light 11 returned by the external object carries biological characteristic information of the external object, and the detection light 11 returned by the external object is received by the detection module 19 through the protection layer 100 and at least part of the display module 104. The way in which the detection light 11 returns through the external object includes, but is not limited to, the detection light 11 entering the external object and then being transmitted out; or the detection light 11 propagates through total reflection in the protective layer 100, and is diffusely reflected at a position where an external object contacts the protective layer 100 to return; or the detection light 11 is reflected by an external object and returns after being transmitted out of the protective layer 100. In this embodiment, the external object is a finger of the user, and the detection light ray 11 returned through the finger carries fingerprint feature information of the finger. The detection light 11 passes through the protection layer 100, then enters the finger for transmission, and then is transmitted out from the surface of the finger with fingerprint lines, and returns to the detection module 19 for receiving.

Optionally, in some embodiments, the detection light source 16 is located closer to the bottom 14 of the electronic device 1 than the detection module 19, and a horizontal distance between the detection module 19 and the detection light source 16 is 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 2000nm. For example, the detection light 11 is near infrared light having a wavelength of 800nm to 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 sources 161 and the second detection light sources 162 are arranged at intervals along the width axis X of the electronic device 1, and are respectively located at different positions of the field area VA. Wherein the first detection light source 161 is closer to the left side edge 17 of the electronic device 1, and the second detection light source 162 is closer to the right side edge 18 of the electronic device 1. The first detection light source 161 is configured to project the first detection light 110. The second detection light source 162 is configured to project the second detection light 112. The front projection of the upper surface 101 of the protective layer 100 of the first detection light source 161 and the front projection of the upper surface 101 of the protective layer 100 of the second detection light source 162 are axisymmetrically distributed about the long axis L of the upper surface 101 of the protective layer 100. The distance between the front projection of the upper surface 101 of the protective layer 100 and the front projection of the upper surface 101 of the protective layer 100 of the first detection light source 161 and the second detection light source 162 is in the range of 10mm to 25mm, and the distance between the front projection of the upper surface 101 of the protective layer 100 and the front projection of the upper surface 101 of the protective layer 100 of the first detection light source 161 and the second detection light source 162 is, for example: 10mm, 12mm, 16mm, 20mm, or 25mm. In some embodiments, the spacing between two orthographic projections is defined as the distance of the line between the closest points to each other on the respective boundaries of the two orthographic projections. It will be appreciated that in other or alternative embodiments, the spacing between the two orthographic projections may have other definitions, such as a horizontal distance between points closest to each other on the respective boundaries of the two orthographic projections, so long as the definitions used in evaluating the same type of positional relationship remain the same.

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

The first detection light source 161 is formed with a first connection line 61 between the front projection of the upper surface 101 of the protective layer 100 and the center of the field area VA, the second detection light source 162 is formed with a second connection line 62 between the front projection of the upper surface 101 of the protective layer 100 and the center of the field area VA, and an angle formed between the first connection line 61 and the second connection line 62 is in a range of 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 connecting line 61 and the second connecting 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 of sight between the orthographic projection and the center of the field of view area VA is defined as the line of sight between the closest point on the orthographic projection boundary to the center of the field of view area VA and the center of the field of view area VA. It will be appreciated that in other or alternative embodiments, the line between the orthographic projection and the center of the view field region VA may have other reasonable definitions, so long as the definitions used in evaluating the same type of positional relationship remain consistent, for example, but not limited to: if the front projection of the first detection light source 161 and the second detection light source 162 on the upper surface of the protective layer 100 is a regular pattern, the front projection has a center point, and a line between the front projection and the center of the field area VA may also be defined as a line between the center point of the front projection and the center of the field area VA.

The first detection light source 161 is formed with a third connection line 63 between the front projection of the upper surface 101 of the protective layer 100 and the front projection of the second detection light source 162 of the upper surface 101 of the protective layer 100, and a middle point of the third connection line 63 is also located on or near 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 10mm to 20mm. The distance between the center of the field of view area VA and the midpoint of the third line 63 is, for example, 10mm, 12mm, 14mm, 18mm, or 20mm. In some embodiments, a line between two orthographic projections is defined as a line between points on the respective boundaries of the two orthographic projections that are closest to each other. It will be appreciated that in other or alternative embodiments, the connection between two orthographic projections may have other reasonable definitions, provided that the definitions used in evaluating the same type of positional relationship remain the same.

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 closely attached to 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 be spaced from the lower surface 102 of the protective layer 100 or the optical film 122 disposed on the lower surface 102, where the range of 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 122 is 2mm-10mm.

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

Alternatively, as shown in fig. 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 configured to project the first detection light 110. The second light emitting unit 1602 is configured to project the second detection light 112. If the first detection light source 161 includes a plurality of first light emitting units 1601, the front projection of the first detection light source 161 is the sum of the front projections of the plurality of first light emitting units 1601 on the upper surface 101, or is a region capable of covering all the front 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 front projection of the second detection light source 162 is the sum of the front projections of the plurality of second light emitting units 1602 on the upper surface 101, or is a region capable of covering all the front projections of the plurality of second light emitting units 1602. The distance between the first detection light source 161 and the second detection light source 162 is the distance between the adjacent first light emitting unit 1601 and second light emitting unit 1602. If the first detection light source 161 and the second detection light source 162 include a plurality of first light emitting units 1601 and second light emitting units 1602, respectively, the power requirements for each of the first light emitting units 1601 and the second light emitting units 1602 can be appropriately reduced, and the first light emitting units 1601 and the second light emitting units 1602 can be thinner to more easily satisfy the severe space requirements.

The first light emitting unit 1601 and the second light emitting unit 1602 have preset light emitting angles, which are maximum angle ranges in which the first light emitting unit 1601 and the second light emitting unit 1602 can emit the detection light 11. Alternatively, in some embodiments, the light emitting angles of the first light emitting unit 1601 and the second light emitting unit 1602 may range from 90 degrees to 160 degrees. The light emitting angles 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 of the upper surface 101 of the protective layer 100 that can be irradiated by the detection light source 16 is defined as an irradiation area P of the detection light source 16, and the detection light 11 emitted by the detection light source 16 is emitted from the irradiation area P of the upper surface 101 to the external object. It is understood that the irradiation area P of the first detection light source 161 is the sum of the irradiation areas P of the included one or more first light emitting units 1601, and the irradiation area P of the second detection light source 162 is the sum of the irradiation areas P of the included one or more second light emitting units 1602.

Optionally, in some embodiments, the illumination region P does not overlap with the field of view region VA. Specifically, a portion of the boundary of the irradiation region P may overlap with a portion of the boundary of the field region VA, that is, the irradiation region P and the field region VA may be in a circumscribed state with respect to each other. Alternatively, in other or modified embodiments, the illumination area P may be further disposed at a distance from the field area VA.

The layers of the detection light 11 emitted by the detection light source 16, including but not limited to the protection layer 100, transmit before being irradiated upward to the external object, reflect a portion of the detection light 11 downward, and the portion of the detection light 11 is stray light that does not return to the external object. The stray light does not have biological characteristic information of an external object, and if the stray light is received by the detection module 19, background noise is formed, so that detection is disturbed. If there is an overlap region between the illumination region P and the field of view region VA, the stray light will be reflected back to the detection module 19 in the overlap region. Therefore, in the present embodiment, the illumination area P and the field area VA are not overlapped, which can effectively reduce stray light generated by the detection light 11 during the process of illuminating the external object, and is beneficial to improving the signal-to-noise ratio of the optical detection device 10.

In other or alternative embodiments, the illumination area P may also partially overlap the field area VA within an allowable background noise range, and the overlapping portion of the two may be defined as an overlapping region. In order to control the background noise generated by the overlapping of the illumination area P and the field area VA, the proportion of the overlapping area should be minimized. For example: the area of the overlap region S is no more than 5%, 10%, 20%, or 30% of the area of the field of view region 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, a combination of one or more of 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).

Alternatively, in some embodiments, the plurality of 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 have equal intervals therebetween and have a value ranging from 0.5mm to 1.5mm. The second light emitting units 1602 are arranged at equal intervals along the width axis X of the electronic device 1, and the adjacent first light emitting units 1601 have equal intervals, and the value range is 0.5mm to 1.5mm. The interval between the adjacent second light emitting units 1602 may be equal to the interval between the adjacent first light emitting units 1601, or the interval between the adjacent second light emitting units 1602 may not be equal to the interval between the adjacent first light emitting units 1601. The interval between the adjacent first light emitting units 1601 and the interval between the adjacent second light emitting units 1602 are each much smaller than the interval between the first light emitting sources 161 and the second light emitting sources 162.

It is understood that in other or alternative embodiments, the intervals between adjacent first light emitting units 1601 may not be equal. Or the intervals between the adjacent second light emitting units 1602 may be unequal.

Alternatively, 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: 12mm. When the first detection light source 161 and the second detection light source 162 include a larger number of light emitting units 1601, 1602, for example: the number of the detection light sources is 3 or more, the intensity of the detection light 11 emitted by the first detection light source 161 and the second detection light source 162 is increased, and the range of the area to be irradiated is also increased. Therefore, there is enough detection light 11 to return to the detection module 19 via the finger for effective detection corresponding to different pressing postures of the finger when detecting, such as the finger pressing the field of view VA along the width axis X of the electronic device 1 as shown in fig. 3.

Alternatively, 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 first detection light source 161 and the second detection light source 162 have a pitch of, for example: 10mm.

It is understood that, if the number of the light emitting units 1601, 1602 included in each of the first detection light source 161 and the second detection light source 162 is greater, the distance between the first detection light source 161 and the second detection light source 162 may be relatively greater.

As shown in fig. 2, the finger print 1000 has ridges 1100 and valleys 1200. In fingerprint detection, a user touches the upper surface 101 of the protective layer 100 with a finger, the ridge 1100 is in contact with the upper surface 101, and the valley 1200 does not contact the upper surface 101. The detection light 11 is projected into the finger after being emitted from the irradiation area P of the upper surface 101, propagates toward the field area VA inside the finger, and is transmitted from the portion of the fingerprint 1000 in contact with the field area VA of the upper surface 101 to return to the detection module 19.

When the finger is internally seen along the projection direction of the detection light 11, the ridge 1100 is attached to the upper surface 101 of the protective layer 100, the valley 1200 is convex, and when the detection light 11 is projected from a certain direction, the convex valley 1200 forms a shadow at the ridge 1100 positioned at the backlight side, and the shadow can enhance the contrast of the bright and dark stripes corresponding to the ridge 1100 and the valley 1200 in the obtained fingerprint image, thereby being beneficial to obtaining clear fingerprint details and improving the recognition rate of the obtained fingerprint image for fingerprint recognition. However, by using the shadow imaging principle, only a clear fingerprint image in a small fingerprint line area closest to the incoming light direction can be obtained, and the number of details of the fingerprint image is usually smaller although the details are clear, so that the detection light rays 11 need to be respectively projected from different directions to obtain the clear fingerprint image of the lines of other parts of the finger.

Referring to fig. 1,2, and 5 a-5 b, in order to briefly and clearly illustrate the shadow imaging situation in the fingerprint image obtained when the detection light 11 is projected to the finger from different directions, the fingerprint pattern 2000 formed by the finger contacting the field area VA is simplified to be a first fingerprint pattern 2100 and a second fingerprint pattern 2200 with mutually perpendicular pattern directions in fig. 5 a-5 b. Dark lines in the fingerprint pattern 2000 correspond to valleys 1100 that are not in contact with the upper surface 101 of the protective layer 100, and bright lines between adjacent dark lines correspond to ridges 1200 that are in contact with the upper surface 101 of the protective layer 100.

The valleys 1200 may also be different for shadows formed by the detection light 11 projected from different orientations, such as: when the projection direction of the detection light 11 is perpendicular to the trend of the fingerprint pattern 2000, the shadow formed by the valley 1200 is more obvious, and the corresponding fingerprint pattern 2000 in the obtained fingerprint image has higher contrast. 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 at this time, the fingerprint image formed by the fingerprint pattern 2000 of the corresponding portion cannot be used for recognition because the light-dark contrast is too low. For the detected light 11, the relation between the projection direction and the fingerprint pattern 2000 trend of which is between perpendicular and parallel, the greater the included angle between the projection direction and the fingerprint pattern 2000 trend, the more obvious the shadow formed by the corresponding valley 1200, and the higher the contrast of the corresponding fingerprint pattern 2000 in the obtained fingerprint image.

Optionally, in some embodiments, the portions of the fingerprint image where the brightness difference between the bright and dark fringes formed by the ridges 1100 and the valleys 1200 is greater than 4% have clearer details, so that the recognition rate is relatively high when the fingerprint is recognized. The details of the portions of the fingerprint image, where the brightness difference between the ridges 1100 and the valleys 1200 is less than or equal to 4%, are blurred, and the recognition rate is relatively low when the fingerprint image is used for fingerprint recognition.

Fig. 5a shows a shadow imaging situation of the fingerprint pattern 2000 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. The main portion of the first detection light 110 emitted by the first detection light source 161 after entering the finger interior irradiates the first fingerprint pattern 2100 along a direction substantially perpendicular to the first fingerprint pattern 2100, so that a distinct shadow is formed on the backlight side of the first fingerprint pattern 2100. And a major portion of the first detection light 110 after entering the inside of the finger irradiates the second fingerprint pattern 2200 in a direction substantially parallel to the second fingerprint pattern 2200, so that the second set of fingerprint patterns 2200 are not or are not significantly shaded. Therefore, in the case where the first detection light source 161 irradiates the fingerprint pattern 2000 and the second detection light source 162 does not emit light, the portion corresponding to the first fingerprint pattern 2100 in the fingerprint image obtained by the detection module 19 has a higher contrast, for example: the difference in brightness between the bright and dark fringes is greater than 4%, and the contrast of the portion corresponding to the second fingerprint path 2200 is low, for example: the brightness difference of the bright and dark stripes is less than 4%, and the bright and dark stripes are the blurred part of the fingerprint image. The sharp part of the fingerprint image can be used for fingerprint recognition, while the blurred part of the fingerprint image cannot be used for effective fingerprint recognition.

Fig. 5b shows a shadow imaging situation in which 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, where the fingerprint pattern 2000 is imaged. The main portion of the second detection light 112 emitted by the second detection light source 162 after entering the interior of the finger irradiates the second fingerprint pattern 2200 along a direction substantially perpendicular to the second fingerprint pattern 2200, so that a distinct shadow is formed on the backlight side of the second fingerprint pattern 2200. While a major portion of the second detection light 112 after entering the interior of the finger irradiates the first fingerprint ridge 2100 in a direction substantially parallel to the first fingerprint ridge 2100, so that the first set of fingerprint ridges 2100 do not form shadows or the shadows formed are not obvious. Therefore, in the case where the second detection light source 162 irradiates the fingerprint pattern 2000 and the first detection light source 161 does not emit light, the portion corresponding to the second fingerprint pattern 2200 in the fingerprint image obtained by the detection module 19 has a higher contrast, for example: the difference in brightness between the bright and dark fringes is greater than 4%, and the contrast of the portion corresponding to the first fingerprint path 2100 is low, for example: the brightness difference of the bright and dark stripes is less than 4%, and the bright and dark stripes are the blurred part of the fingerprint image. The sharp part of the fingerprint image can be used for fingerprint recognition, while the blurred part of the fingerprint image cannot be used for effective fingerprint recognition.

As can be seen from the above, in the different fingerprint images obtained by respectively projecting the first detection light 110 and the second detection light 112 in different directions compared with the finger, the respective clear portions and the blurred portions have better complementarity, which is beneficial to obtaining a clear image of the fingerprint pattern 2000 in a larger range for subsequent fingerprint recognition.

It will be appreciated that the detection light rays 11 respectively projected from different directions are not preferably projected in the same period, otherwise, the shadow of the fingerprint pattern 2000 formed by the detection light rays 11 projected from one direction will be weakened or dissipated by the detection light rays 11 projected from the other direction, so that the brightness contrast of the obtained shadow image of the fingerprint pattern 2000 will be reduced. Therefore, for the light emitting unit 160 that projects the detection light 11 from different directions, it is necessary to perform the projection at different 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 fig. 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 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, respectively, and is configured to drive the first light emitting unit 1601 or the second light emitting unit 1602 to emit the detection light 11. In performing fingerprint detection, the first driving circuit 1501 is controlled by the controller 1500 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 1000 in a first period. 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 finger print 1000 in the second period under the control of the controller 1500.

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

As can be seen from the foregoing discussion, the sharp and blurred portions of the first fingerprint image are different from the sharp and blurred portions 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 characteristic points for fingerprint identification. The first fingerprint image and the second fingerprint image can be respectively and independently used for fingerprint identification, can also be used for fingerprint identification together, or can be combined into a fingerprint image with higher integrity of a clear part for fingerprint identification.

The first period and the second period are respectively time periods occurring at different moments. The duration of the first period and the second period may be adjusted according to the exposure time of the detection module 19, for example, as follows: 10 milliseconds (ms), 20ms, 30ms, or 40ms. The duration of the first period and the second period may be equal or unequal.

Optionally, in some embodiments, as shown in fig. 2, the optical detection device 10 further comprises a support frame 15. The supporting frame 15 is used for carrying the protective layer 100, the display module 104, the detection light source 16 and/or the detection module 19. The protective layer 100, the display module 104, the detection light source 16 and/or the detection module 19 may be fixedly connected or detachably connected with the support frame 15 by means of glue, double-sided tape, adhesive, bolts, brackets, buckles, clamping grooves, welding, etc. The support frame 15 includes a bottom plate 150 and side walls 152. The bottom plate 150 is located below the protection layer 100 and the display module 104 to support the display module 104. The side walls 152 extend from the edges of the bottom plate 150 and are 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 may be fixedly attached or detachably attached to the inner surface 154 of the sidewall 152 by means of glue, double sided tape, adhesive, bolts, brackets, snaps, clamping grooves, welding, etc.

It will be appreciated that in other or alternative embodiments, the detection light source 16 may be disposed on other structures of the optical detection device 10, such as, but not limited to: the display panel 105 and/or the backlight module 106 may be any type as long as the detection light source 16 can emit the detection light 11 to the external object for detection through the protection layer 100.

Optionally, in some embodiments, the bottom plate 150 further has an opening 153. The opening 153 is located below the transparent region 220 of the protective layer 100 and is substantially opposite to the field 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 from the external object sequentially passes through the protection 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 may be offset from the opening 153. Such as, but not limited to, variations or alternative embodiments of some of the optical detection devices 10 that employ periscopic imaging structures.

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.

Fig. 7 is a schematic front view of an optical detection device 20 according to a second embodiment of the present application applied to an electronic apparatus 2, as shown in fig. 7. The optical detection device 20 of the second embodiment has a structure substantially identical to that of the optical detection device 10 of the first embodiment, and differs mainly in that: the detection light source 26 further includes a third detection light source 263, 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 arranged along the width axis X of the electronic device 2. The third detection light source 263 is configured to project a third detection light 213 to the fingerprint through the protection layer 100. The third connection line 63 is formed between the front projection of the upper surface 201 of the protective layer 200 and the front projection of the upper surface 201 of the protective layer 200 by the first detection light source 261. The projection of the third detecting light source 263 on the upper surface 201 of the protective layer 200 is located on the third connecting 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 at the middle position of the third wire 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 positioned at different orientations of the finger of the user contacting the field area VA, and the projection direction of the third detection light beam 213 emitted by the third detection light source 263 is also different from the projection directions of the first detection light beam 210 and the second detection light beam 212.

Referring to fig. 7 and 8, the first driving circuit 2501 is connected to the third detecting light source 263. When performing fingerprint detection, the first driving circuit 2501 is controlled by the controller 2000 to simultaneously drive the first detection light source 261 and the third detection light source 263 to respectively project the first detection light ray 210 and the third detection light ray 213 to the fingerprint of the finger for fingerprint detection in a first period. The first driving circuit 2501 is configured to simultaneously drive the second detection light source 262 and the third detection light source 263 to respectively project the second detection light ray 212 and the third detection light ray 213 to the fingerprint for fingerprint detection in a second period under the control of the controller 2000. The second driving circuit 2502 is configured to drive the detecting module 29 to receive the first detecting light 210 and the third detecting light 213 returned via the finger print in a first period under the control of the controller 2000, so as to obtain a corresponding first fingerprint image of the finger print. The second driving circuit 2502 is configured to drive the detection module 29 to receive the second detection light 212 and the third detection light 213 returned via the finger print in a second period under the control of the controller 2000, so as to obtain a second fingerprint image corresponding to the finger print.

It can be appreciated that if the interval between the first detection light source 261 and the second detection light source 262 is further, the brightness of the finger print portion irradiated by the first detection light source 261 or the second detection light source 262 when the first detection light source 261 or the second detection light source 262 is individually lighted may be insufficient, which is not beneficial to obtaining a clear fingerprint image. Thus, 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 each irradiates the finger print, which is beneficial to obtaining a distinct fingerprint image.

In addition, the projection direction of the first detection light ray 210 is greatly different from the projection direction of the second detection light ray 220, and if the first detection light ray 210 and the second detection light ray 212 are projected at the same time, shadows caused by each other on the finger print 2000 are weakened or counteracted. However, the projection direction of the third detection light 213 is different from the projection direction of the first detection light 210 and the projection direction of the second detection light 220, respectively, the third detection light 213 has a smaller influence on the shadow of the finger fingerprint 2000 formed by the first detection light 210, and the projection of the third detection light 213 may also form a part of the shadow which is not generated under the original projection of the first detection light 210, so as to increase the clear portion of the corresponding acquired first fingerprint image. Therefore, the third detecting light source 263 and the first detecting light source 261 can simultaneously project the detecting light 21 in the first period to obtain the first fingerprint image with better quality. Based on the same principle, the third detecting light source 263 and the second detecting light source 262 may project the detecting light 21 simultaneously in the second period of time 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 circuits 2501 are respectively connected to the third light emitting units 2603, and the first driving circuits 2501 are used for driving the third light emitting units 2603 to project the third detection light beam 213. If the third detecting 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 detecting light source 261 simultaneously projects the detecting light 21 to the finger print in the first period, and at least one of the third light emitting units 2603 and the second detecting light source 262 simultaneously projects the detecting light 21 to the finger print in the second period.

Specifically, the one or more first light emitting units 2601 of the first detection light source 261 and the one or more third light emitting units 2603 of the third detection light source 263 constitute a first light emitting combination 2610. As can be seen, the first light emitting combination 2610 includes a plurality of light emitting units. In performing fingerprint detection, the first driving circuit 2501 is configured to drive the first light emitting unit 2601 and the third light emitting unit 2603 in the first light emitting combination 2610 to respectively project the first detection light ray 210 and the third detection light ray 213 to the fingerprint of the finger in a first period of time under the control of the controller 2000. The second driving circuit 2502 is configured to drive the detection module 29 to receive the first detection light ray 210 and the third detection light ray 213 returned via the finger fingerprint in a first period of time under the control of the controller 2000, so as to obtain corresponding first fingerprint images of the finger fingerprint under the irradiation of the first detection light ray 210 and the third detection light ray 213.

The one or more second light emitting units 2602 of the second detection light source 262 and the one or more third light emitting units 2603 of the third detection light source 263 constitute a second light emitting combination 2620. As can be seen, the second light emission combination 2620 includes a plurality of light emission units. In performing fingerprint detection, the first driving circuit 2501 is under the control of the controller 2000, and is configured to drive the second light emitting unit 2602 and the third light emitting unit 2603 in the second combination 2620 to respectively project the second detection light ray 212 and the third detection light ray 213 to the fingerprint of the finger during the second period. The second driving circuit 2502 is configured to drive the detection module 29 to receive the second detection light 212 and the third detection light 213 returned via the finger print in a second period of time under the control of the controller 2000, so as to obtain corresponding second fingerprint images of the finger print under the irradiation of the second detection light 212 and the third detection light 213.

Optionally, in some embodiments, the adjacent first light emitting units 2601 in the first light emitting combination 2610 have an equal first interval L1 therebetween, and an interval between the adjacent first light emitting units 2601 and the third light emitting units 2603 is defined as a second interval L2, where 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 in a non-equidistant manner, and at least two non-equidistant pitches are arranged between every two adjacent light emitting units. The first interval L1 has a value ranging from 0.5mm to 2mm, and is, for example, 0.6mm, 1mm, 1.2mm, 1.65mm, 1.8mm, or 2mm. The value of the second interval L2 ranges from 8mm to 12mm, and the second interval L2 is 8mm, 10mm or 12mm, for example.

Alternatively, in other or alternative embodiments, if the first light emitting combination 2610 includes a plurality of third light emitting units 2603, adjacent third light emitting units 2603 may also have an equal third interval (not shown) between them, where the third interval ranges from 0.5mm to 2mm, and the third interval is, for example, 0.6mm, 1mm, 1.2mm, 1.65mm, 1.8mm, or 2mm.

Alternatively, 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 be different from each other.

Optionally, in some embodiments, the second light emitting units 2602 adjacent to each other in the second light emitting combination 2620 have an equal fourth interval L4 therebetween, and an interval between the second light emitting units 2602 adjacent to each other and the third light emitting unit is defined as a fifth interval L5, where 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 light emitting units in the second light emitting combination 2620 are arranged at unequal intervals, and at least two unequal intervals are arranged between every two adjacent light emitting units. The value of the fourth interval L4 ranges from 0.5mm to 2mm, and the fourth interval L4 is, for example, 0.6mm, 1mm, 1.2mm, 1.65mm, 1.8mm, or 2mm. The fifth interval L5 has a value ranging from 8mm to 12mm, and the fifth interval L2 is, for example, 8mm, 10mm, or 12mm.

Alternatively, in other or alternative embodiments, if the second light emitting combination 2620 includes a plurality of third light emitting units 2603, each two adjacent third light emitting units 2603 may also have an equal sixth interval (not shown) therebetween, where the sixth interval ranges from 0.5mm to 2mm, and the sixth interval is, for example, 0.6mm, 1mm, 1.2mm, 1.65mm, 1.8mm, or 2mm.

Alternatively, 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 be different from each other.

It is 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 be equal or unequal.

Optionally, in some embodiments, the detection module 19, 29 may further include a processor (not shown) and a memory (not shown), where the processor can obtain fingerprint information of the user, such as, but not limited to, a fingerprint image, based on the received detection light 11. The memory has stored therein a biometric information template, such as, but not limited to, a fingerprint image template. The processor can compare the acquired fingerprint image with a pre-stored fingerprint image template, so that fingerprint identification is realized. Based on the fingerprint identification, the optical detection device 10, 20 provided by the application can be used for locking or unlocking the electronic equipment 1,2, verifying the online payment service, verifying the identity of a financial system or a public security system, verifying the passing of an access control system and other various products and application scenes.

The optical detection devices 10 and 20 of the present application respectively set different detection light sources 16 and 26 at different orientations compared with the view field area VA, so as to respectively irradiate finger fingerprints contacting with the view field areas VA and V2 from different directions in different periods of time, and the contrast of the acquired fingerprint image can be enhanced by the shadows of the fingerprint lines formed by irradiation, so as to improve the recognition rate of the fingerprint image for fingerprint recognition. In addition, the respective clear portions of the different fingerprint images acquired respectively corresponding to the different irradiation angles can be mutually complemented, so that the proportion of the clear portions which can be used for fingerprint identification in the fingerprint images is increased.

The structures and positions of the protective layer 100, the display module 104, the detection light source 16, the field of view region VA, and the like in the above-described embodiment or modified embodiment of the present application and the corresponding modified arrangement may be applied to other embodiments disclosed herein, and thus all the embodiments and the substitutions, modifications, combinations, splitting, expanding, omitting, and the like thereof are included in the scope of the present application.

It should be noted that, the light emitting surface, the light entering surface, etc. which may occur in the description of the present application may be a physical surface that exists actually, or may be an imaginary surface, which does not affect the implementation of the technical scheme of the present application, and all belong to the scope of the present application. In addition, the possible "overlapping", "overlapping" and "overlapping" in the description of the present application should be understood to have the same meaning and be replaced with each other.

It should be understood by those skilled in the art that, without any inventive effort, some or all of the embodiments of the present application, as well as some or all of the modifications, substitutions, alterations, permutations, combinations, extensions, etc. of the embodiments are considered to be covered by the inventive concept of the present application, and are within the scope of the present application.

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

The references to "length", "width", "upper", "lower", "left", "right", "front", "rear", "back", "front", "vertical", "horizontal", "top", "bottom", "interior", "exterior", etc., as may be made in this specification are based on the references to orientations or positional relationships shown in the drawings, merely to facilitate the description of the embodiments of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and are not to be construed as limiting the application. Like reference numerals and letters designate like items in the drawings, and thus once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance. In the description of the present application, the meaning of "plurality" or "plurality" means at least two or two, unless specifically defined otherwise. In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, or may be internal communication between two elements. The specific meaning of the above terms in the present application will be understood in detail by those skilled in the art.

The foregoing is merely illustrative of the present application, and the present application is not limited to the above embodiments, and any person skilled in the art can easily think about the changes and substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. The terms used in the following claims should not be construed to limit the application to the specific embodiments disclosed in the specification. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An optical inspection device, comprising:

The first light-emitting combination comprises a plurality of light-emitting units, at least two unequal intervals are arranged between every two adjacent light-emitting units in the first light-emitting combination, the second light-emitting combination comprises a plurality of light-emitting units, at least two unequal intervals are arranged between every two adjacent light-emitting units in the second light-emitting combination, at least part of detection light emitted by the first light-emitting combination and at least part of detection light emitted by the second light-emitting combination are respectively projected to the external object along different directions, the first time period and the second time period are respectively different time periods, the detection module is used for receiving detection light returned in a view field area through the external object in the first time period to obtain corresponding first detection information, and the detection module is used for receiving detection light returned in the view field area through the external object in the second time period to obtain corresponding second detection information, and the first detection information or/and the second detection information are used for identifying the external object.

2. The optical inspection apparatus 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 having an equal first spacing therebetween, adjacent first light emitting units having a second spacing therebetween that 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 having an equal fourth spacing therebetween, adjacent second light emitting units having a fifth spacing therebetween that is greater than the fourth spacing.

3. The optical detection device of claim 2, wherein the first and fourth intervals range from 0.5mm to 2mm in value and the second and fifth intervals range from 8mm to 12mm in value.

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

5. The optical detection device according to claim 4, wherein a distance between adjacent first and second light emitting units is in a range of 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 detection device according to claim 2, wherein the optical detection device is applied to an electronic device, the electronic device has a length axis along a length direction thereof and a width axis along a width direction thereof, the upper surface of the protective layer includes a top end edge and a bottom end edge disposed opposite to each other along the length axis of the electronic device, a line between a midpoint of the top end edge and a midpoint of the bottom end edge is defined as a long axis of the upper surface, a center of the field of view is located on or near the long axis, and orthographic projections of the first luminous combination and the second luminous combination on the upper surface of the protective layer are symmetrically distributed about the long axis.

7. The optical detection device according to claim 6, wherein the first light-emitting combination and the second light-emitting combination are arranged at intervals along a width axis of the electronic apparatus, wherein a side of the first light-emitting combination on which the third light-emitting unit is provided and a side of the second light-emitting combination on which the third light-emitting unit is provided are close to each other, and one or more of the first light-emitting units and one or more of the second light-emitting units are arranged at intervals along the width axis of the electronic apparatus.

8. The optical detection device according to claim 1, wherein the protective layer has a transparent region and a non-transparent region connected, the non-transparent region being located around or at an edge of the transparent region, the transparent region being for transmitting visible light, the non-transparent region being for blocking visible light and transmitting the detection light, the first light-emitting combination and the second light-emitting combination being located below the non-transparent region of the protective layer, the display module being located below the transparent region of the protective layer.

9. The optical inspection device of 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, wherein 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 using the backlight beam.

10. The optical inspection device of claim 1, further comprising a support frame for carrying the protective layer, the display module, the first light emitting unit, the second light emitting unit, the third light emitting unit, or/and the inspection module, the support frame including a base plate and a sidewall, the base plate being positioned below the protective layer and the display module, the sidewall extending from an edge of the base plate and being connected to a periphery of the protective layer, the sidewall including an inner surface facing the display module, the inspection module being fixedly or detachably connected to the inner surface.

11. The optical detection device according to claim 1, wherein the external object is a finger, the detection light passes through the protective layer, then enters the finger to propagate, and then is transmitted out from the surface of the finger with fingerprint lines to return to the detection module, the detection light returned by the finger has fingerprint characteristic information of the finger, and the first detection information and the second detection information obtained by converting the detection light by the detection module are respectively a first fingerprint image and a second fingerprint image.

12. The optical detection device according to claim 2, 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 2, wherein the light emission angles of the first light emission unit, the second light emission unit, and the third light emission unit range from 90 degrees to 160 degrees.

14. The optical detection device of claim 2, wherein the first light emitting unit, the second light emitting unit, or/and the third light emitting unit may be one or more combinations of LED, LD, VCSEL, mini-LEDs, micro-LED, OLED, QLED.

15. The optical inspection apparatus according to claim 2, wherein an 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, the first inspection light, the second inspection light, and the third inspection light are emitted from the irradiation area 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 device of any one of claims 1-15, wherein the upper surface of the protective layer is an outer surface of the electronic device.