CN211698976U - Optical detection device and electronic equipment - Google Patents
Optical detection device and electronic equipment Download PDFInfo
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- CN211698976U CN211698976U CN201922121739.9U CN201922121739U CN211698976U CN 211698976 U CN211698976 U CN 211698976U CN 201922121739 U CN201922121739 U CN 201922121739U CN 211698976 U CN211698976 U CN 211698976U
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Abstract
The application discloses optical detection device, it includes: the protective layer comprises an upper surface and a lower surface which are oppositely arranged; the detection module is positioned below the lower surface, and the receiving module is provided with a view field area on the upper surface; and the first light-emitting combination and the second light-emitting combination are positioned below part of the lower surface and used for respectively projecting detection light rays in different directions to an external object positioned above the protective layer in a first time period and a second time period. The first light-emitting combination and the second light-emitting combination are respectively provided with a plurality of light-emitting units which are arranged at unequal intervals, the detection module is used for receiving detection light rays returned in the field area by an external object in a first period of time so as to obtain corresponding first detection information, the detection module is used for receiving detection light rays returned in the field area by the external object in a second period of time so as to obtain corresponding second detection information, and the first detection information or/and the second detection information is/are used for identifying the external object.
Description
Technical Field
The present application relates to the field of optoelectronic technologies, and in particular, to an optical detection apparatus and an electronic device.
Background
With the technical progress and the improvement of living standard of people, users demand more functions and fashionable appearance for electronic equipment such as mobile phones, tablet computers and cameras. At present, the development trend of electronic devices such as mobile phones and the like is to have higher screen occupation ratio and have functions of fingerprint detection and the like. In order to realize a full screen or a screen close to the full screen effect, the electronic equipment has a high screen occupation ratio, and a fingerprint detection technology under the screen is developed. However, for non-self-luminous displays such as liquid crystal display screens, the prior art has no better under-screen detection scheme.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present application provides an optical detection apparatus and an electronic device 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 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 the detection light returned in the field area by the external object in the first time interval to obtain first detection information corresponding to the external object, the detection module is used for receiving the detection light returned in the field area by the external object in the second time interval to obtain second detection information corresponding to the external object, the first detection information or/and the second detection information is used for identification of the external object.
In some embodiments, the first light-emitting assembly 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, adjacent first light-emitting units have an equal first interval therebetween, adjacent first light-emitting units and third light-emitting units have a second interval therebetween, the second interval is greater than the first interval, the second light-emitting assembly 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, adjacent second light-emitting units have an equal fourth interval therebetween, adjacent second light-emitting units and third light-emitting units have a fifth interval therebetween, and the fifth interval is greater than the fourth interval.
In certain embodiments, the first and fourth spacings range from 0.5mm to 2mm, and the second and fifth spacings range from 8mm to 12 mm.
In some embodiments, the third light-emitting unit in the first and second light-emitting combinations is located between adjacent first and second light-emitting units.
In some embodiments, the distance between the adjacent first light-emitting unit and the second light-emitting unit ranges from 10mm to 25mm, and the third light-emitting unit is located at a middle position between the first light-emitting unit and the second light-emitting unit.
In some embodiments, the optical detection apparatus is applied to an electronic device, the electronic device has a length axis along its length direction and a width axis along its width direction, the upper surface of the protection layer includes a top end edge and a bottom end edge oppositely disposed along the length axis of the electronic device, a connecting 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, the center of the field of view region is located on or near the long axis, and an orthographic projection of the first light-emitting combination on the upper surface of the protection layer and an orthographic projection of the second light-emitting combination on the upper surface of the protection layer are symmetrically distributed about the long axis.
In some embodiments, 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 where the third light-emitting unit is disposed and a side of the second light-emitting combination where the third light-emitting unit is disposed are adjacent to each other, and 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.
In some embodiments, 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 detection light, the first light-emitting assembly and the second light-emitting assembly are both 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 an image by using the backlight beam.
In some embodiments, the display module further comprises a supporting frame, the supporting frame is used for supporting 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 supporting frame includes a bottom plate and a sidewall, the bottom plate is parallel to the upper surface of the protective layer, the sidewall extends from an edge of the bottom plate and surrounds a periphery of the protective layer, the sidewall includes 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.
In some embodiments, the external object is a fingerprint, the detection light passes through the protective layer and then enters the inside of the finger to propagate, and then is transmitted out from the surface of the finger with the fingerprint pattern and returns to the detection module, the detection light returned by the finger has fingerprint feature information of the finger, and the first detection information and the second detection information acquired by converting the detection light by the detection module are respectively a first fingerprint image and a second fingerprint image.
In some embodiments, light emitting surfaces of the first, second, and third light emitting units are parallel to an upper surface of the protective layer.
In some embodiments, the light emission angles of the first light emitting unit, the second light emitting unit, and the third light emitting unit range 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 a combination of one or more of an LED, an LD, a VCSEL, a Mini-LED, a Micro-LED, an OLED, and a QLED.
In some embodiments, the area of the upper surface of the protective layer that can be irradiated by the first and second light-emitting combinations is defined as an irradiation area, the first, second, and third detection lights 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 apparatus in any one of the above embodiments, wherein an upper surface of the protective layer is an outer surface of the electronic device.
The beneficial effects of this application lie in that, the optical detection device that this application provided sets up the detection light source respectively in the different positions that compare in the visual field region, follow the not external object of equidirectional illumination and visual field region contact respectively, clear part and fuzzy part can complement each other in the different external object images of corresponding acquireing to be favorable to improving the recognition efficiency to external object.
Drawings
Fig. 1 is a schematic front view of an optical detection apparatus applied to an electronic device according to a first embodiment of the present application;
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 view of an arrangement of light emitting units of a detecting light source of the optical detecting device in FIG. 1;
FIG. 4 is a schematic view of an arrangement of light emitting units of a detection light source of the optical detection apparatus shown in FIG. 1;
FIGS. 5 a-5 b illustrate the shadow of a fingerprint formed by the light source of the optical inspection device of FIG. 1 illuminating the simplified fingerprint from different directions;
FIG. 6 is a schematic diagram of a control circuit of the detection light source of the optical detection apparatus shown in FIG. 1.
Fig. 7 is a schematic front view of an optical detection apparatus applied to an electronic device according to a second embodiment of the present application;
fig. 8 is a schematic diagram of a control circuit of the detection light source of the optical detection apparatus of fig. 7.
Detailed Description
In the detailed description of the embodiments herein, it will be understood that when a substrate, a sheet, a layer, or a pattern is referred to as being "on" or "under" another substrate, another sheet, another layer, or another pattern, it can be "directly" or "indirectly" on the other substrate, the other sheet, the other layer, or the other pattern, or one or more intervening layers may also be present. The thickness and size of each layer in the drawings of the specification may be exaggerated, omitted, or schematically represented for clarity. Further, the sizes of the elements in the drawings do not completely reflect actual sizes.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
Further, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject technology can be practiced without one or more of the specific details, or with other structures, components, and so forth. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the focus of the application.
Referring to fig. 1 to fig. 2, fig. 1 is a schematic front view of an optical detection apparatus 10 applied to an electronic device 1 according to a first embodiment of the present disclosure, and fig. 2 is a schematic partial cross-sectional view of the optical detection apparatus 10 taken along a line II-II in fig. 1. The electronic device 1 has a length axis in its own length direction Y, a width axis in its own width direction X, and a thickness axis in its own thickness direction Z. The electronic device 1 comprises a top part 13 and a bottom part 14 which are oppositely arranged along the length direction Y. The electronic device 1 is, for example, a mobile phone, and may include an earphone 130, a front camera 132, and a sound sensor 140. The earpiece 130 and the front camera 132 may be positioned near the top 13 of the electronic device 1. The sound sensor 140, for example: a microphone may be disposed on the electronic device 1 proximate the base 14. The electronic device 1 further comprises a first side 17 and a second side 18 oppositely arranged 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, when viewed from a front view of the electronic device 1.
The optical detection device 10 is used to detect 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, however, and 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 is described by taking the example of detecting a finger fingerprint. It is understood that the skin surface texture of the palm, toes, and other parts may also be used as the feature of the detection object or the external object to be detected of the optical detection apparatus 10 of the present application.
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 protection layer 100 and a display module 104. The protection layer 100 includes an upper surface 101 and a lower surface 102 disposed opposite to each other. The display module 104 is used for displaying a picture, the display module 104 is located below the lower surface 102 of the protection layer 100, and the protection layer 100 is used for protecting the display module 104 from the external environment. The detection light source 16 is located below a portion of the protection layer 100, and the detection light source 16 is used for projecting detection light 11 to an external object located above the protection layer 100. The detecting light ray 11 includes a first detecting light ray 110 and a second detecting light ray 112 respectively projected from different directions to an external object, and a projection direction of the first detecting light ray 110 is different from a projection direction of the second detecting light ray 112. The detection module 19 is located below the lower surface 102 of the protection layer 100, the detection module 19 is configured to receive the detection light 11 returned by the external object through the protection layer 100 and at least a portion of the display module 104, and the detection light 11 returned by the external object carries the biometric information of the external object. The detection module 19 receives a first detection light 110 returned by the external object to obtain a first detection information corresponding to the external object. The detection module 19 receives a second detection light 112 returned by the external object to obtain a 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 or/and the lower surface 102 is a plane, and the edge portion of the main body is a curved surface.
Optionally, in some embodiments, the protection layer 100 has a non-transparent region 210 and a transparent region 220 connected, and the non-transparent region 210 is located around or at the edge of the transparent region 220. The transparent area 220 is used for transmitting visible light, and the non-transparent area 210 is used for blocking visible light and transmitting 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 region 210 is used to block visible light so that elements inside the display device 12 are not visible to a user at the non-transparent region 210. In an 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 for visible light beams is not limited to less than 10%, as long as the internal elements are not visible from the outside of the protective layer 100 through the non-transparent region 210. It can be understood that the main body of the protection layer 100 is a transparent substrate (not labeled), the protection layer 100 can realize the function of shielding visible light by disposing the optical film layer 122 on the lower surface 102 of the transparent substrate located in the non-transparent region 210, the non-transparent region 210 of the protection layer 100 includes the optical film layer 122 and a portion of the transparent substrate facing the optical film layer 122, and the transparent region 220 of the protection layer 100 includes a portion of the transparent substrate not facing 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 have a single-layer structure or a multi-layer structure. The protective layer 100 is a substantially thin plate with 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 shown in fig. 2, the width direction is the width axis X direction of the electronic device 1 shown in fig. 2, and the thickness direction is the thickness axis Z direction of the electronic device 1 shown in fig. 2.
It is understood that the protective layer 100 may include a plastic film, a tempered film, and/or other various film layers, etc. attached by a user in actual use, and the upper surface 101 of the protective layer 100 is a surface that an external object directly contacts when performing biometric sensing. 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 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 underscreen fingerprint identification device.
The display module 104 is located under the protection layer 100 and opposite to the transparent area 220. Optionally, in some embodiments, the display module 104 is a passive light emitting display module, such as but not limited to a liquid crystal display module or an electronic paper display module, and the display device 12 is correspondingly, such as but not limited to a liquid crystal display device or a liquid crystal display screen. The display module 104 includes a display panel 105 and a backlight module 106. The display panel 105 is located under the protection layer 100 and opposite to the transparent area 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 using the backlight beam.
Generally, an area of the display panel 105 for displaying an image is defined as a display area (not shown), and an area around the display area where the image cannot be displayed is defined as a non-display area (not shown). In the present application, the transparent area 220 is directly opposite to the display area, and the orthographic projection of the transparent area 220 in the display area is located in the display area or completely coincides with the display area. The non-transparent region 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 region 210 is larger than the area of the non-display region. 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 disposed opposite to each other 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 a length axis Y of the electronic device 1. The non-transparent region 210 includes at least a first non-transparent region 2100 at the bottom 14 of the electronic device 1, the first non-transparent region 2100 is an elongated region extending along the width axis X of the electronic device 1, and 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 area 2100 of the protective layer 100 and 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 returning in the FOV via an external object can be received by the detection module 19 and converted into an electrical signal to acquire corresponding detection information, including but not limited to a fingerprint image. For example, in the present embodiment, the first detection information may be a first fingerprint image formed by the finger fingerprint under the irradiation of the first detection light 110. Correspondingly, the second detection information may be a second fingerprint image formed by the finger fingerprint under the irradiation of the second detection light 112.
The part of the upper surface 101 of the protection layer 100, which is located in the field angle range of the detection module 19, is a field 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 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: 100-140 degrees, or 120-130 degrees. Optionally, the thickness of the detection module 19 is, for example, but not limited to, 1 to 2mm, or 2 to 3 mm, or 3 to 4 mm.
It should be noted that, without being particularly limited, the field angle of the detection module 19 described in the present application may be a field angle of an XZ plane, a field angle of a YZ plane, or other possible field angles of 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 a portion of a cone, or other possible solid shapes.
Optionally, in some embodiments, the center point of the field of view area VA is located on or near the long axis L. The viewing area VA is close to the bottom edge 108 of the upper surface 101, and a distance between a center of the viewing 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 30 mm.
In this embodiment, the detecting module 19 is disposed under the backlight module 106 and under the transparent region 220 of the protection layer 100 and the display region of the display panel 105. The orthographic projection of the detection module 19 on the upper surface 101 is located within the view field area VA, and the area of the orthographic projection is smaller than the area of the view field area VA. The detection light 11 returned by the external object is transmitted through the protection layer 100, the display panel 105 and the backlight module 106 to be 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 protection layer 100 and a portion of the display panel 105 and is received by the photosensitive element to implement corresponding sensing. It is understood that the detecting module 19 may 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 for emitting 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 is transmitted through the protective layer 100 and at least part of the display module 104 to be received by the detection module 19. The way of the detection light 11 returning through the external object includes, but is not limited to, the detection light 11 first enters the inside of the external object and then returns after being transmitted; alternatively, the detection light 11 propagates by total reflection in the protective layer 100, and returns by diffuse reflection at a position where an external object is in contact with the protective layer 100; alternatively, the detection light 11 is transmitted through the protective layer 100 and then reflected by an external object to return. In the present embodiment, the external object is a finger of a user, and the detection light 11 returned via the finger carries fingerprint feature information of the finger. The detection light 11 firstly enters the inside of the finger to be transmitted after passing through the protective layer 100, and then is transmitted out from the surface of the finger with the fingerprint grain and returns to the detection module 19 to be received.
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, and a horizontal distance between the detection module 19 and the detection light source 16 is 10mm to 20 mm.
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 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 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 positions of the view field area VA. Wherein 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 detecting light source 161 is used for projecting the first detecting light 110. The second detection light source 162 is used for projecting 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 distributed in axial symmetry with respect to the long axis L of the upper surface 101 of the protective layer 100. The range of 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 is 10mm to 25mm, and 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 is, for example: 10mm, 12mm, 16mm, 20mm, or 25 mm. In some embodiments, the separation between the two forward projections is defined as the link distance between the closest points to each other on the respective boundaries of the two forward projections. It is understood that in other or modified embodiments, the distance between the two orthogonal projections may have other definitions, such as the horizontal distance between the closest points on the respective boundaries of the two orthogonal projections, as long as the definitions used in evaluating the same type of positional relationship are consistent before and after.
In this embodiment, the first and second detection light sources 161 and 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 the distance between the first detection light source 161 and the second detection light source 162 also ranges from 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 25 mm.
First detection light source 161 is formed with first line 61 between the orthographic projection of protective layer 100 upper surface 101 and the center of field of view region VA, second detection light source 162 is formed with second line 62 between the orthographic projection of protective layer 100 upper surface 101 and the center of field of view region VA, the angular range of the contained angle that forms between first line 61 and the second line 62 is 45 degrees to 95 degrees, 60 degrees to 115 degrees, or 80 degrees to 120 degrees. The included angle formed between the first line 61 and the second 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, a connection line between the forward projection and the center of the field of view area VA is defined as a connection line between a point on the forward projection boundary closest to the center of the field of view area VA and the center of the field of view area VA. It is understood that in other or modified embodiments, the connecting line between the forward projection and the center of the field of view area VA may have other reasonable definitions as long as the definitions used in evaluating the same kind of positional relationship are consistent, such as 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 protection layer 100 are regular patterns, the orthographic projections have center points, and a connection line between the orthographic projections and the center of the field area VA can also be defined as a connection line between the center points of the orthographic projections and the center of the field area VA.
The first detecting light source 161 is formed with a third connecting line 63 between the orthographic projection of the upper surface 101 of the protective layer 100 and the orthographic projection of the second detecting light source 162 on the upper surface 101 of the protective layer 100, and the midpoint of the third connecting 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, a distance between the center of the field of view area VA and the midpoint of the third connecting line 63 ranges from 10mm to 20 mm. The distance between the center of the field area VA and the midpoint of the third line 63 is, for example, 10mm, 12mm, 14mm, 18mm, or 20 mm. In some embodiments, the line between the two forward projections is defined as the line between the points closest to each other on the respective boundaries of the two forward projections. It is understood that in other or modified embodiments, the connection line between two orthographic projections may have other reasonable definitions, as long as the definitions used before and after evaluating the same type of positional relationship are consistent.
Alternatively, 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 protection 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 protection 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 protection layer 100 or the optical film layer 122 disposed on the lower surface 102, and at this time, the spacing 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 protection layer 100 or the optical film layer 122 ranges from 2mm to 10 mm.
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 where the field area VA is located.
Optionally, 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 detecting light source 161 includes a plurality of first light emitting units 1601, the forward projection of the first detecting light source 161 is the sum of the forward projections of the plurality of first light emitting units 1601 on the upper surface 101, or is an area capable of covering all the forward 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 an area capable of covering all the orthographic 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 the second light-emitting unit 1602. If the first and second detection light sources 161 and 162 include a plurality of first and second light-emitting units 1601 and 1602, respectively, the power requirement for each of the first and second light-emitting units 1601 and 1602 can be appropriately reduced, and the first and second light-emitting units 1601 and 1602 can be thinner to more easily meet the demanding space requirement.
The first light emitting unit 1601 and the second light emitting unit 1602 have a predetermined light emitting angle, which is the maximum angle range within 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 vary in a range of 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 area P and the field of view area VA do not overlap. Specifically, a partial boundary of the irradiation region P may coincide with a partial boundary of the field of view region VA, that is, the irradiation region P and the field of view region VA are in a circumscribed state with respect to each other. Alternatively, in other or modified embodiments, the irradiation region P and the field of view region VA may be spaced from each other.
The layers of the structure, including but not limited to the protection layer 100, through which the detection light 11 emitted by the detection light source 16 passes before it is irradiated to the external object will reflect a portion of the detection light 11 downward, where the portion of the detection light 11 is stray light that is not returned by the external object. The stray light does not carry the biological characteristic information of the external object, and background noise is generated after the stray light is received by the detection module 19, so that the stray light interferes detection. If there is an overlapping area between the illumination area P and the view field area VA, the stray light will be reflected back to the detection module 19 in the overlapping area. Therefore, in the present embodiment, the irradiation region P and the field region VA are not overlapped, so that stray light generated by the detection light 11 during irradiation of an external object can be effectively reduced, which is beneficial to improving the signal-to-noise ratio of the optical detection apparatus 10.
In other or modified embodiments, the irradiation region P may also partially overlap with the field of view region VA within an allowable background noise range, and a portion where the irradiation region P and the field of view region VA overlap is defined as an overlapping region. In order to control the background noise generated by the overlap of the illumination region P and the field of view region VA, the proportion of the overlap region 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, one or more of a Light Emitting Diode (LED), a laser diode (ld), a vcsel (vertical viewing surface emitting laser), a Mini-LED, a Micro-LED, an OLED (organic light emitting diode), and a qled (quantum dot light emitting diode).
Optionally, in some embodiments, 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 have equal intervals therebetween, which range from 0.5mm to 1.5 mm. The 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 have equal intervals therebetween, and the value range is 0.5mm to 1.5 mm. The interval between the adjacent second light emitting units 1602 may be equal to the interval between the adjacent first light emitting units 1601, and 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 both much smaller than the interval between the first light-emitting light sources 161 and the second light-emitting light sources 162.
It is to be understood that, in other or modified embodiments, the intervals between the adjacent first light emitting units 1601 may not be equal. Alternatively, the intervals between the adjacent second light emitting units 1602 may not be equal.
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: 12 mm. When the number of the light emitting units 1601, 1602 included in the first and second detection light sources 161, 162 is large, for example: the number of the first detecting light sources 161 and the second detecting light sources 162 is 3 or more than 3, the intensity of the detecting light 11 emitted by the first detecting light sources 161 and the second detecting light sources 162 is increased, and the range of the area to be irradiated is correspondingly increased. Therefore, for different pressing postures of the finger during detection, such as pressing the view field area VA along the width axis X of the electronic device 1 by the finger as shown in fig. 3, enough detection light 11 can return to the detection module 19 via the finger to achieve effective detection.
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 distance therebetween, for example: 10 mm.
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 larger, the distance between the first detection light source 161 and the second detection light source 162 may be relatively larger.
As shown in FIG. 2, the finger fingerprint 1000 has ridges 1100 and valleys 1200. When fingerprint detection is performed, a 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 projected into the finger after being emitted from the irradiation region P of the upper surface 101, and propagates inside the finger toward the field of view region VA, and is transmitted out of the portion of the fingerprint 1000 in contact with the field of view region VA of the upper surface 101 to return to the detection module 19.
Inside along the projection direction of detection light 11 sees at the finger, ridge 1100 and the laminating of protective layer 100 upper surface 101, millet 1200 is protruding form, works as when detection light 11 throws from a certain direction, bellied millet 1200 can form the shadow at the ridge 1100 that is located the side of being shaded, the contrast with the light and shade stripe that ridge 1100, millet 1200 correspond in the fingerprint image that the shadow can strengthen acquireing is favorable to acquireing clear fingerprint detail, improves the fingerprint image that acquireing and is used for fingerprint identification's identification rate. However, the above shadow imaging principle can only be used to obtain a clear fingerprint image in a small fingerprint pattern area closest to the incoming light direction, and the number of the fingerprint images is usually small although the details of the fingerprint images are clear, so that the detection light 11 needs to be projected from different directions to obtain a clear fingerprint image of the pattern 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 lines 2000 formed by the finger contacting the field area VA in fig. 5 a-5 b are simplified into the first fingerprint line 2100 and the second fingerprint line 2200 with the line directions perpendicular to each other. The dark stripes of the fingerprint stripes 2000 correspond to valleys 1100 that are not in contact with the upper surface 101 of the protective layer 100, and the bright stripes located between adjacent dark stripes correspond to ridges 1200 that are in contact with the upper surface 101 of the protective layer 100.
The valleys 1200 may also vary in the shadow formed by the detected light rays 11 projected from different orientations, such as: when the projection direction of the detection light 11 is perpendicular to the trend of the fingerprint lines 2000, the shadow formed by the valleys 1200 is obvious, and the corresponding fingerprint lines 2000 in the acquired fingerprint image have high light and dark contrast. When the projection direction of the detection light 11 is parallel to the trend of the fingerprint lines 2000, the valleys 1200 cannot form shadows, and at this time, the fingerprint image formed by the corresponding portion of the fingerprint lines 2000 cannot be used for identification due to too low light-dark contrast. For the detection light 11 whose relation between the projection direction and the trend of the fingerprint grain 2000 is between vertical and parallel, the greater the included angle between the projection direction and the trend of the fingerprint grain 2000, the more obvious the shadow correspondingly formed by the valley 1200 is, and the higher the contrast of the corresponding fingerprint grain 2000 in the acquired fingerprint image is.
Optionally, in some embodiments, the portions of the fingerprint image where the brightness difference of the light and dark stripes formed by the ridges 1100 and the valleys 1200 is more than 4% have clearer details, and the recognition rate for fingerprint recognition is relatively high. The partial details of the fingerprint image, in which the brightness difference of the light and dark stripes formed by the ridges 1100 and the valleys 1200 is less than or equal to 4%, are relatively fuzzy, 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 vein 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 vein 2000, and the second detection light source 162 near the right side 18 of the electronic device 1 does not emit light. A main portion of the first detection light 110 emitted by the first detection light source 161 after entering the finger irradiates the first fingerprint print 2100 along a direction substantially perpendicular to the first fingerprint print 2100, so that a significant shadow is formed on the backlight side of the first fingerprint print 2100. And the main portion of the first detection light 110 entering the inside of the finger irradiates the second fingerprint ridge 2200 in a direction substantially parallel to the second fingerprint ridge 2200, so that the second fingerprint ridge 2200 does not form a shadow or forms a shadow less obviously. Therefore, in the case that the first detection light source 161 irradiates the fingerprint vein 2000 and the second detection light source 162 does not emit light, the portion of the fingerprint image obtained by the detection module 19 corresponding to the first fingerprint vein 2100 has a higher contrast, for example: the brightness difference of the light and dark stripes is greater than 4%, which is a clear portion of the fingerprint image, and the contrast of the portion corresponding to the second fingerprint ridge 2200 is low, for example: the brightness difference of the light and dark stripes is less than 4 percent, and the light and dark stripes are fuzzy parts of the fingerprint image. The clear portion of the fingerprint image can be used for fingerprint recognition, while the blurred portion of the fingerprint image cannot be used for effective fingerprint recognition.
Fig. 5b shows a shadow imaging situation of the fingerprint vein 2000 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 vein 2000, and the first detection light source 161 near the left side 17 of the electronic device 1 does not emit light. A main portion of the second detection light 112 emitted by the second detection light source 162 after entering the inside of the finger irradiates the second fingerprint 2200 along a direction substantially perpendicular to the second fingerprint 2200, so that a significant shadow is formed on the backlight side of the second fingerprint 2200. While the main portion of the second detection light 112 entering the finger illuminates the first fingerprint print 2100 in a direction generally parallel to the first fingerprint print 2100, so that the first fingerprint print 2100 is not shaded or is not shaded significantly. Therefore, in the case that the second detection light source 162 irradiates the fingerprint vein 2000 and the first detection light source 161 does not emit light, the portion of the fingerprint image obtained by the detection module 19 corresponding to the second fingerprint vein 2200 has a higher contrast, for example: the brightness difference of the bright and dark stripes is greater than 4%, which is a clear portion of the fingerprint image, and the contrast of the portion corresponding to the first fingerprint vein 2100 is low, for example: the brightness difference of the light and dark stripes is less than 4 percent, and the light and dark stripes are fuzzy parts of the fingerprint image. The clear portion of the fingerprint image can be used for fingerprint recognition, while the blurred portion 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 projecting the first detection light 110 and the second detection light 112 respectively in different directions compared to the finger, the respective clear portions and the blurred portions have better complementarity, which is beneficial to obtaining a clear image with a larger range of the fingerprint pattern 2000 for subsequent fingerprint identification.
It can be understood that the detecting light rays 11 respectively projected from different directions are not suitable to be projected in the same time period, otherwise the shadow of the fingerprint vein 2000 formed by the detecting light rays 11 projected from one direction may be weakened or dissipated by the detecting light rays 11 projected from the other direction, thereby reducing the contrast of the obtained shadow image of the fingerprint vein 2000. Therefore, for the light emitting unit 160 that projects the detection light 11 from different directions, it is necessary to project them separately at different periods of time.
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 apparatus 10 shown in fig. 1 and 2. The optical inspection 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 detecting light source 161 and the second light-emitting unit 1602 of the second detecting 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 detecting light 11. In performing fingerprint detection, the first driving circuit 1501 is under the control of the controller 1500, and is configured to drive the first light emitting unit 1601 of the first detection light source 161 to project the first detection light 110 to the finger fingerprint 1000 in a first period. The first driving circuit 1501 is under the control of the controller 1500, and is configured to drive the second light emitting unit 1602 of the second detecting light source 162 to project the second detecting light 112 to the finger fingerprint 1000 in the second time period.
The second driving circuit 1502 is connected to the detection 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 detecting module 19 to receive the first detecting light 110 returned by the finger fingerprint 1000 in a first period of time, so as to obtain a corresponding first fingerprint image of the finger fingerprint 1000 under the irradiation of the first detecting light 110. The second driving circuit 1502 is configured to drive the detecting module 19 to receive the second detecting light 112 returned by the finger fingerprint 1000 in a second time period under the control of the controller 1500, so as to obtain a corresponding second fingerprint image of the finger fingerprint 1000 under the irradiation of the second detecting light 112.
As can be seen from the previous discussion, the sharp and blurred portions in 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, different fingerprint characteristic points can be respectively provided for the clear part of the first fingerprint image and the clear part of the second fingerprint image to be used for fingerprint identification. The first fingerprint image and the second fingerprint image can be separately used for fingerprint identification, can also be used for fingerprint identification, or the first fingerprint image and the second fingerprint image can be combined into a fingerprint image with a higher integrity of a clear part and then used for fingerprint identification.
The first time period and the second time period are time periods occurring at different times, respectively. The duration of the first time interval and the second time interval can be adjusted according to the exposure time of the detection module 19, for example: 10 milliseconds (ms), 20ms, 30ms, or 40 ms. The duration of the first period may be equal to or different from the duration of the second period.
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 protection 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 and/or the detection module 19 may be fixedly connected or detachably connected to the supporting frame 15 by glue, double-sided tape, adhesive, bolts, brackets, fasteners, slots, welding, etc. The support frame 15 includes a bottom plate 150 and a sidewall 152. The bottom plate 150 is located below the protection layer 100 and the display module 104 to support the display module 104. The sidewalls 152 extend from the edge of the bottom plate 150 and are connected to the periphery of the protection 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 removably attached to the inner surface 154 of the sidewall 152 by glue, double sided tape, adhesive, bolts, brackets, snaps, slots, welding, or the like.
It is 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 and/or the backlight module 106 may be configured to allow the detection light source 16 to emit detection light 11 through the protection layer 100 to the external object for detection.
Optionally, in some embodiments, the bottom plate 150 also has an opening 153. The opening 153 is located below the transparent region 220 of the protection layer 100 and is substantially opposite to the viewing region VA. The detection module 19 is located at least partially 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 returning 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 detecting module 19 may be offset from the opening 153. For example, but not limited to, in some variations or alternative embodiments of the optical inspection device 10 that employ a periscopic imaging configuration.
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 an electronic device 2 to which an optical detection apparatus 20 provided in the second embodiment of the present application is applied. The optical detection device 20 of the second embodiment has substantially the same structure as 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 detecting light source 263 is used for projecting third detecting light 213 to the finger fingerprint through the protection layer 100. The third connecting 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 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 protection layer 200 is located in the middle of the third connecting line 63. As can be seen, the first detecting light source 261, the second detecting light source 262 and the third detecting light source 263 are respectively located at different positions of the user's finger contacting the view field VA, and the projection direction of the third detecting light 213 emitted by the third detecting light source 263 is also different from the projection direction of the first detecting light 210 and the second detecting light 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 under the control of the controller 2000, and is configured to simultaneously drive the first detecting light source 261 and the third detecting light source 263 to project the first detecting light 210 and the third detecting light 213 to the fingerprint of the finger for fingerprint detection in a first period. The first driving circuit 2501 is under the control of the controller 2000 and is configured to simultaneously drive the second detecting light source 262 and the third detecting light source 263 to project the second detecting light 212 and the third detecting light 213, respectively, to the finger fingerprint for fingerprint detection in a second time period. The second driving circuit 2502 is used for driving the detecting module 29 to receive the first detecting light 210 and the third detecting light 213 returned by the finger fingerprint in a first period under the control of the controller 2000, so as to obtain a first fingerprint image corresponding to the finger fingerprint. The second driving circuit 2502 is configured to drive the detecting module 29 to receive the second detecting light 212 and the third detecting light 213 returned by the finger fingerprint in a second time period under the control of the controller 2000, so as to obtain a second fingerprint image corresponding to the finger fingerprint.
It can be understood that, if the distance between the first detection light source 261 and the second detection light source 262 is relatively long, the brightness of the finger fingerprint portion irradiated by the first detection light source 261 or the second detection light source 262 when being respectively and independently illuminated may be insufficient, which is not favorable for obtaining a clear fingerprint image. Thus, the third detecting light source 263 disposed between the first detecting light source 261 and the second detecting light source 262 can be used to supplement the overall brightness when the first detecting light source 261 and the second detecting light source 262 irradiate the finger fingerprint, respectively, which is beneficial to obtaining a clear fingerprint image.
In addition, the projection direction of the first detecting light ray 210 is different from the projection direction of the second detecting light ray 220, and if the first detecting light ray 210 and the second detecting light ray 212 are projected simultaneously, the shadows of the finger fingerprint 2000 caused by the first detecting light ray 210 and the second detecting light ray can be weakened or cancelled. However, the difference between the projection direction of the third detection light 213 and the projection direction of the first detection light 210 and the projection direction of the second detection light 220 is small, the influence of the third detection light 213 on the shadow of the finger fingerprint 2000 formed by the first detection light 210 is small, and the projection of the third detection light 213 may also form a part of shadow that is not generated by the original projection of the first detection light 210, so as to increase the clear portion of the correspondingly obtained 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 of time, so as to obtain the first fingerprint image with better quality. For the same reason, the third detecting light source 263 and the second detecting light source 262 may project the detecting light 21 simultaneously in the second time period to obtain the second fingerprint image with better quality.
Optionally, in some embodiments, the third detecting 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 configured to drive the third light emitting units 2603 to project the third detecting light 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 project the detecting light 21 to the finger print at the same time in the first time period, and at least one of the third light emitting units 2603 and the second detecting light source 262 project the detecting light 21 to the finger print at the same time in the second time period.
Specifically, one or more first light emitting units 2601 of the first detection light source 261 and 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 assembly 2610 includes a plurality of light emitting units. When performing fingerprint detection, the first driving circuit 2501 is under the control of the controller 2000, and is configured to drive the first light emitting unit 2601 and the third light emitting unit 2603 in the first light emitting assembly 2610 to project the first detecting light 210 and the third detecting light 213 to the finger fingerprint respectively in a first period. The second driving circuit 2502 is used for driving the detecting module 29 to receive the first detecting light 210 and the third detecting light 213 returned by the finger fingerprint in a first period under the control of the controller 2000, so as to obtain a corresponding first fingerprint image of the finger fingerprint under the irradiation of the first detecting light 210 and the third detecting light 213.
The one or more second light emitting units 2602 of the second detecting light source 262 and the one or more third light emitting units 2603 of the third detecting light source 263 constitute a second light emitting combination 2620. Therefore, the second light emitting assembly 2620 includes a plurality of light emitting units. When performing fingerprint detection, the first driving circuit 2501 is under the control of the controller 2000 to drive the second light emitting unit 2602 and the third light emitting unit 2603 in the second light emitting combination 2620 to project the second detection light 212 and the third detection light 213, respectively, to the finger fingerprint in a second period. The second driving circuit 2502 is configured to drive the detecting module 29 to receive the second detecting light 212 and the third detecting light 213 returned by the finger fingerprint in the second time period under the control of the controller 2000, so as to obtain a corresponding second fingerprint image of the finger fingerprint under the irradiation of the second detecting light 212 and the third detecting light 213.
Alternatively, in some embodiments, 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 unit 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 spacing L2 is greater than the first spacing L1. Therefore, the light emitting units in the first light emitting assembly 2610 are arranged at unequal intervals, and at least two kinds of unequal intervals are arranged between every two adjacent light emitting units. The first interval L1 ranges from 0.5mm to 2mm, and the first interval is, for example, 0.6mm, 1mm, 1.2mm, 1.65mm, 1.8mm, or 2 mm. The value of the second interval L2 ranges from 8mm to 12mm, and the second interval L2 is, for example, 8mm, 10mm, or 12 mm.
Alternatively, in another or modified embodiment, if the first light emitting assembly 2610 includes a plurality of third light emitting units 2603, adjacent third light emitting units 2603 may have an equal third interval (not shown), where the third interval is in a range from 0.5mm to 2mm, and the third interval is, for example, 0.6mm, 1mm, 1.2mm, 1.65mm, 1.8mm, or 2 mm.
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 also be unequal to each other.
Alternatively, in some embodiments, adjacent second light emitting units 2602 in the second light emitting combination 2620 have an equal fourth interval L4 therebetween, an interval between the adjacent second light emitting units 2602 and the third light emitting unit 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 light emitting units in the second light emitting assembly 2620 are arranged at unequal intervals, and at least two different intervals are formed between every two adjacent light emitting units. The value range of the fourth interval L4 is 0.5mm to 2mm, and the fourth interval L4 is, for example, 0.6mm, 1mm, 1.2mm, 1.65mm, 1.8mm, or 2 mm. The value of the fifth interval L5 ranges from 8mm to 12mm, and the fifth interval L2 is, for example, 8mm, 10mm, or 12 mm.
Alternatively, in other or modified embodiments, if a plurality of third light emitting units 2603 are included in the second light emitting combination 2620, every two adjacent third light emitting units 2603 may also have an equal sixth interval (not shown), where the sixth interval is in a range from 0.5mm to 2mm, and the sixth interval is, for example, 0.6mm, 1mm, 1.2mm, 1.65mm, 1.8mm, or 2 mm.
Alternatively, in other or modified embodiments, the fourth intervals L4 between every two adjacent second light-emitting units 2602 in the second light-emitting combination 2620 may also be not equal to 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), and the processor may be capable of acquiring fingerprint information of the user, such as but not limited to a fingerprint image, according to the received detection light 11. The memory is pre-stored with 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 devices 10 and 20 provided by the application can be used for locking or unlocking the electronic devices 1 and 2, verifying online payment service, verifying the identity of a financial system or a public security system, verifying the passage 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 up different detection light sources 16 and 26 in different directions compared with the view field area VA to respectively irradiate finger fingerprints contacting with the view field area VA and V2 from different directions in different periods, and can strengthen the contrast of the acquired fingerprint image by irradiating the shadow of the formed fingerprint grain, so as to improve the recognition rate of the fingerprint image for fingerprint recognition. In addition, the respective clear portions can complement each other corresponding to different fingerprint images respectively acquired at different illumination angles, thereby increasing the proportion of the clear portions which can be used for fingerprint identification in the fingerprint images.
The above-described embodiments, modified embodiments, and modified arrangements thereof may also be applied to other embodiments disclosed in the present application with respect to the structures and positions of the protective layer 100, the display module 104, the detection light source 16, the field area VA, and the like, and thus the obtained embodiments and their substitutions, modifications, combinations, splits, extensions, omissions, and the like are all within the scope of the present application.
It should be noted that the light exit surface, the light incident surface, and the like that may appear in the description of the present application may be a real surface that actually exists, or may be an imaginary surface, which does not affect the implementation of the technical solution of the present application, and all belong to the scope of the present application. In addition, "overlap", and the like, which may occur in the description of the present application, are to be understood as having the same meaning and being replaceable with each other.
It should be noted that, as will be understood by those skilled in the art, part or all of the embodiments of the present application, and part or all of the modifications, substitutions, alterations, splits, combinations, extensions, etc. of the embodiments should be considered as being covered by the inventive concept of the present application, and fall 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. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature or structure is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature or structure in connection with other ones of the embodiments.
The orientations or positional relationships indicated by "length", "width", "upper", "lower", "left", "right", "front", "rear", "back", "front", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, which may appear in the specification of the present application, are based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application. Like reference numbers and letters refer to like items in the figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance. In the description of the present application, "plurality" or "a plurality" means at least two or two unless specifically defined otherwise. In the description of the present application, it should also be noted that, unless explicitly stated or limited otherwise, "disposed," "mounted," and "connected" are to be understood in a broad sense, e.g., they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. The terms used in the following claims should not be construed to limit the invention to the specific embodiments disclosed in the specification. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (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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|---|---|---|---|
| CN201922121739.9U CN211698976U (en) | 2019-11-28 | 2019-11-28 | Optical detection device and electronic equipment |
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| CN201922121739.9U CN211698976U (en) | 2019-11-28 | 2019-11-28 | Optical detection device and electronic equipment |
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| CN211698976U true CN211698976U (en) | 2020-10-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111339815A (en) * | 2019-11-28 | 2020-06-26 | 深圳阜时科技有限公司 | Optical detection device and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111339815A (en) * | 2019-11-28 | 2020-06-26 | 深圳阜时科技有限公司 | Optical detection device and electronic equipment |
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