CN210155693U

CN210155693U - Optical detection device

Info

Publication number: CN210155693U
Application number: CN201921329821.4U
Authority: CN
Inventors: 林峰; 王小明
Original assignee: Shenzhen Fushi Technology Co Ltd
Current assignee: Shenzhen Fushi Technology Co Ltd
Priority date: 2019-08-16
Filing date: 2019-08-16
Publication date: 2020-03-17
Anticipated expiration: 2029-08-16

Abstract

The utility model discloses an optical detection device, including protective layer, light source, light converter and detection module, the protective layer includes first surface and second surface, and the display module assembly is located the protective layer deviates from one side of first surface. The light source is positioned on one side of the second surface and emits a detection light beam to the upper part of the first surface of the protective layer. The optical converter is positioned between the light source and the first surface, deflects the detection light beam and then enters the protective layer from the second surface, and part or all of the detection light beam meets the condition of total reflection transmission at least in the protective layer. The detection module receives the detection light beam returned by the external object and converts the detection light beam into an electric signal to acquire the biological characteristic information of the external object. The utility model discloses can realize better under the screen fingerprint detection effect.

Description

Optical detection device

Technical Field

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

Background

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

SUMMERY OF THE UTILITY MODEL

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

An aspect of the present invention provides an optical detection apparatus, which can actively emit light onto an external object and realize biometric detection by receiving return light of the external object, including: the display device comprises a protective layer, a display module and a fixing frame, wherein the display module is positioned below the protective layer, the fixing frame is used for accommodating the protective layer and the display module, the protective layer comprises a first surface and a second surface, the display module is positioned on one side of the protective layer, which is far away from the first surface, and the display module can emit visible light to the outside of the first surface through the protective layer so as to display an image; the light source is positioned on one side of the second surface, emits a detection light beam above the first surface of the protective layer and is connected with the bottom or the side part of the fixed frame; the light converter is positioned in a non-display area between the light source and the first surface of the protective layer, the detection light beams are transmitted to the light converter from the light source through a space between the side part of the fixing frame and the display module, the light converter is used for enabling at least part of the detection light beams emitted by the light source to enter the protective layer from the second surface after being deflected according to a preset diffusion angle, and part or all of the detection light beams meet the condition of total reflection transmission at least in the protective layer; the detection module is positioned below the protective layer, receives detection light beams returned by an external object through the protective layer and converts the detection light beams into electric signals to acquire biological characteristic information of the external object, wherein the detection module is provided with a field area on the first surface, and the optical converter deflects the detection light beams emitted by the light source towards the direction of the field area.

In some embodiments, the optical converter and the second surface of the protective layer are fully attached, at least a part of the detection beam can be transmitted in the protective layer in a total reflection manner, an area where the detection beam reaches the first surface for the first time is defined as a preset area, when no finger contacts the preset area, the detection beam is totally reflected in the field of view area, when the finger contacts the field of view area, at least a part of the detection beam is diffusely reflected at a contact position of the field of view area and a ridge of a fingerprint, and the detection module receives the diffusely reflected detection beam.

In certain embodiments, the protective layer has a non-transparent region and a transparent region, the non-transparent region being located around the transparent region; the light source is located below the non-transparent area of the protective layer, the light converter is located between the light source and the non-transparent area of the protective layer, a detection light beam emitted by the light source enters the protective layer from the non-transparent area after being deflected by the light converter and can directly irradiate the preset area located on the first surface, and at least part of the preset area is located in the transparent area.

In some embodiments, there is an overlapping region between the preset region and the field of view region, the detection light beam directly irradiated to the overlapping region satisfies the condition of total reflection transmission in the protective layer, and at least a part of the detection light beam in the non-overlapping region where the preset region does not overlap with the field of view region can reach the field of view region after total reflection transmission.

In some embodiments, the light source and the light converter are spaced apart by a distance of 1 mm, 2 mm, 3 mm, 4 mm, 5 mm.

In some embodiments, the light source includes a light emitting unit and a circuit board, and the light emitting unit has a light emitting surface facing the light converter and a lower surface connected to the circuit board.

In some embodiments, the shorter side of the light emitting surface is not greater than 0.5 mm, and/or the shorter side of the circuit board is not greater than 1 mm.

In some embodiments, the light source includes a plurality of light emitting units, the light emitting units are top emission type or side emission type light emitting elements, the light emitting units have light emitting angles of not more than 10 degrees, 20 degrees, 30 degrees, 40 degrees, 50 degrees in a length axis direction of the protective layer, and the light emitting units have light emitting angles of between 40 degrees and 140 degrees in a width axis direction of the protective layer.

In some embodiments, the detection module is at least partially located below the display module, the detection light beam is diffusely reflected at the ridge of the fingerprint at the first surface of the protective layer and returns to the inside of the protective layer and further exits through the second surface of the protective layer, the detection module can receive the detection light beam exiting from the protective layer through at least part of the display module and convert the detection light beam into an electrical signal, the light source and the orthographic projection of the display module on the first surface of the protective layer are not overlapped or partially overlapped, and the orthographic projection of the light source on a plane perpendicular to the first surface is located below the orthographic projection of the display module on the plane.

In some embodiments, the display module includes a display unit and a backlight unit, the display unit is located below the protective layer, the backlight unit is located below the display unit, the display unit is used for displaying images, the backlight unit is used for providing backlight beams of visible light required for displaying images for the display unit, the detection module is located below the backlight unit, or at least a part of the detection module is located inside the display unit, or at least a part of the detection module is located between the backlight unit and the display unit.

In certain embodiments, the light converter is one or more of a diffractive optical element, a grating, a diaphragm, a lens, a prism, an optical film, an optical microstructure.

The beneficial effects of the utility model reside in that, the utility model discloses optical detection device includes protective layer, detection module and light source, the protective layer includes first surface and second surface, and the light source is used for providing the measuring beam, the measuring beam is followed the second surface of leaded light unit gets into the protective layer and can protective layer inside total reflection transmission or from a predetermined regional outgoing. The detection beam can exit from the side of the protective layer facing away from the first surface after being diffusely reflected at the ridges of the finger. The detection module can receive the detection light beam penetrating through the protective layer. The optical detection device can be used for detecting biological characteristics under or in a screen, including fingerprint detection, fingerprint optical imaging, fingerprint identification and the like. The utility model discloses optical detection device has better fingerprint detection effect.

Drawings

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

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

FIG. 3 is a schematic perspective view of a portion of the optical detection apparatus of FIG. 1;

FIG. 4 is a schematic partial cross-sectional view of the optical detection device of FIG. 1;

FIG. 5 is a partial schematic view of the light source shown in FIG. 4;

FIG. 6 is a schematic view, partly in cross-section, of an optical detection device;

FIG. 7 is a schematic view in partial cross-section of an optical detection apparatus;

fig. 8 is a schematic partial cross-sectional view of an embodiment of the optical inspection apparatus of the present invention;

fig. 9 is a partial perspective view of the optical detection device shown in fig. 8.

Detailed Description

In the detailed description of the embodiments of the invention, it will be understood that when a substrate, a sheet, a layer, or a pattern is referred to as being "on" or "under" another substrate, another sheet, another layer, or another pattern, it can be "directly" or "indirectly" on the other substrate, the other sheet, the other layer, or the other pattern, or one or more intervening layers may also be present. The thickness and size of each layer in the drawings of the specification may be exaggerated, omitted, or schematically represented for clarity. Further, the sizes of the elements in the drawings do not completely reflect actual sizes.

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

Further, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject technology can be practiced without one or more of the specific details, or with other structures, components, and so forth. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the focus of the application.

Referring to fig. 1 to 2, fig. 1 is a schematic view of an optical detection device 1 according to an embodiment of the present invention, and fig. 2 is a partial cross-sectional view of the optical detection device 1 along a line a-a in fig. 1. The optical detection device 1 comprises a display device 10, a light converter 17, a light source 18 and a detection module 19. The display device 10 includes a protective layer 11, a display module 12, and a fixing frame 13. The display module 12 is located below the protective layer 11 and can emit visible light through the protective layer 11 to realize image display. The fixing frame 13 accommodates the display module 12 and the protection layer 11.

The protective layer 11 comprises a first surface 111 and a second surface 112 opposite to each other, and a side surface located between the first surface 111 and the second surface 112. The display module 12 is located on one side of the second surface 112 of the protection layer 11. The fixing frame 13 includes a bottom 131 and a side 132, and the bottom 131 is located below the display module 12. The side portion 132 is fixedly connected to the protection layer 11.

In this embodiment, the side portion 132 is connected to the side surface of the protective layer 11. In other or alternative embodiments, the side portion 132 may be connected to the second surface 112 of the protective layer 11.

The light source 18 is located on one side of the second surface 112. The light source 18 is fixed to the bottom 131 of the fixed frame 13 and emits a detection beam 101 above the first surface of the protective layer 11. The orthographic projections of the light source 18 and the display module 12 on the first surface 111 of the protective layer 11 are not overlapped. The orthographic projections of the light source 18 and the display module 12 on a plane perpendicular to the first surface 111 are not overlapped, and the orthographic projection of the light source 18 on the plane perpendicular to the first surface 111 is positioned below the orthographic projection of the display module 121 on the plane. The detection light beam emitted by the light source 18 is transmitted from above the bottom 131 of the fixed frame 13 to the light converter 17 through the space between the side 132 of the fixed frame 13 and the display module 12.

Optionally, in some embodiments, an orthographic projection of the light source 18 and the display module 12 on the first surface 111 of the protective layer 11 partially overlaps, and an orthographic projection of the light source 18 on a plane perpendicular to the first surface 111 is located below an orthographic projection of the display module 121 on the plane.

The detection module 19 is located below the display module 12, and the detection module 19 is fixedly connected with the bottom 131 of the fixed frame 13. For example, but not limited to, the bottom 131 of the fixed frame 13 has a through hole or a groove, in which part or all of the detection module 19 is located. The detection module 19 is used for receiving the detection light beam 101 returned by the external object through the protective layer 11 and the display module 12.

The light converter 17 is located below the second surface 112, and the light converter 17 is attached to the second surface 112. The light converter 17 is used for deflecting the detection light beam 101 emitted by the light source 18 and projecting the deflected detection light beam into the protective layer 11. The detection module 19 has a preset field angle, and has a field area V1 on the first surface 111.

The light converter 17 is used for deflecting the detection light beam 101 emitted by the light source 18 to the direction of the field of view region V1, so that the incident angle of the detection light beam 101 entering the protective layer 11 becomes larger. The second surface 112 has a light incident area E1, and the detection light beam 101 deflected by the light converter 17 enters the protection layer 11 from the light incident area E1 and directly irradiates a predetermined area P1 on the first surface 111. The predetermined region P1 is a region where the detection beam 101 first reaches the first surface 111 after entering the protection layer 11. The light incident region E1 is, for example, but not limited to, a plane or a non-plane. An overlapping region Q1 exists between the preset region P1 and the field-of-view region V1.

Optionally, in some embodiments, the light source 18 and the light converter 17 have a pitch of 1 mm, 2 mm, 3 mm, 4 mm, 5 mm.

Optionally, in some embodiments, there is a partial overlap between the light source 18 and the projection of the display module 12 on the first surface 111 of the protective layer 11.

Optionally, in some embodiments, there is a partial overlap between the projections of the light source 18 and the display module 12 on a plane perpendicular to the first surface 111.

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

Optionally, in some embodiments, the fixing frame 13 may be a middle frame, a side frame, or other components used for supporting and fixing in electronic products such as mobile phones. The fixing frame 13 may comprise metal and/or plastic, or other suitable material. Alternatively, the display module 12 may be fixedly connected or detachably connected with the bottom 131 and/or the side 132 of the fixing frame 13 by glue, double-sided tape, bolts, or snaps. Optionally, a buffer material, such as but not limited to foam, is filled between the display module 12 and the bottom 131 and/or the side 132 of the fixing frame 13.

The protective layer 11 has a transparent region 120 and a non-transparent region 110 connected. The non-transparent region 110 is located at the periphery or edge of the transparent region 120. The transparent region 120 is used to transmit the visible light and the detection light beam 101. The non-transparent region 310 is used to block visible light and transmit the detection beam 101. The visible light beam emitted by the display module 12 exits to the outside of the optical detection device 1 through the transparent area 120, thereby realizing image display. The non-transparent area 110 is used for blocking the visible light beam emitted by the display module 12 and the visible light beam in the ambient light, so that the user cannot see the elements inside the optical detection apparatus 1 in the non-transparent area 110.

Illustratively, the protective layer 11 may include a transparent material, such as, but not limited to, transparent glass, a transparent polymer material, any other transparent material, and the like. The protective layer 11 may be a single-layer structure, or a multi-layer structure. The protective layer 11 is a substantially thin plate having a predetermined length, width and thickness. The length axis of the protective layer 11 corresponds to the Y axis in the drawing, the width axis corresponds to the X axis in the drawing, and the thickness axis corresponds to the Z axis in the drawing.

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

Optionally, in some embodiments, the field of view region V1 is located directly above a local region of the display area. Further optionally, the detection module 19 includes an image sensor and an ultramicro-range lens located above the image sensor, where the ultramicro-range lens is configured to converge the detection light beam 101 onto the image sensor, the image sensor is configured to convert the detection light beam 101 into a corresponding electrical signal, a perpendicular projection of the ultramicro-range lens and the image sensor on the first surface 111 is located within the field of view region V1, and an area of the perpendicular projection is smaller than an area of the field of view region V1.

The non-transparent region 110 includes an upper surface and a lower surface disposed opposite to each other. The transparent region 120 includes an upper surface and a lower surface that are oppositely disposed. The first surface 111 of the protective layer 11 includes an upper surface of the non-transparent region 110 and an upper surface of the transparent region 120. The second surface 112 of the protective layer 11 includes the lower surface of the non-transparent region 110 and the lower surface of the transparent region 120. The first surface 111 is an upper surface of the protection layer 11, and the second surface 112 is a lower surface of the protection layer 11.

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

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

The display module 12 is located below the transparent area 120. The light converter 17 is located below the non-transparent region 110, and the light source 18 is located below the non-transparent region 110 and below the light converter 17. The detection module 19 is located below the display module 12. In this embodiment, the light converter 17 and the lower surface of the non-transparent region 110 are fully attached to each other, for example, but not limited to, there is no air between the light converter 17 and the lower surface of the non-transparent region 110, and the detection light beam 101 enters the protective layer 11 from the light converter 17 after being converted by the light converter 17 without passing through the air. For example, but not limiting of, the light converter 17 may be connected to the protective layer 11 by an optical glue or other bonding medium, and the detection beam 101 from the light converter 17 enters the protective layer 11 through the optical glue or other bonding medium.

Alternatively, in other or modified embodiments, the lower surfaces of the light converter 17 and the non-transparent region 110 are attached to each other, for example, but not limited to, the lower surfaces of the light converter 17 and the non-transparent region 110 have air.

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

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

The optical detection device 1 can detect biometric information of an external object, generate an image of the external object, detect the position of the external object, determine whether the external object is a living object, and the like. In this embodiment, taking fingerprint detection as an example, a part or all of the field-of-view area V1 is a touch area of the user's finger on the first surface 111 during fingerprint detection. The first surface 111 of the protective layer 11 is a surface that is directly contacted by the finger 1000 of the user during fingerprint detection, and is usually the outermost surface of the optical detection device 1 or an electronic product comprising the optical detection device 1. For convenience of description, the preset area P1 can also be regarded as an area directly irradiated by the detection beam 101 on the first surface 111. Part or all of the detection beam 101 satisfies the condition of total reflection transmission in the protective layer 11.

When the user's finger 1000 is not touched on the preset area P1, the presence detection beam 101 is totally reflected in the field of view area V1. When a user's finger 1000 touches the field of view region V1, the detection beam 101 is diffusely reflected at the fingerprint ridge touching the field of view region V1, and the detection beam 101 is totally reflected at the position where the field of view region V1 is opposite to the fingerprint valley. At least part of the detection light beam 101 subjected to diffuse reflection can pass through the protective layer 11 and the display module 12 to be received by the detection module 19. The detection module 19 converts the received detection beam 101 into a corresponding electrical signal to obtain fingerprint information.

In the present embodiment, the preset region P1 and the field-of-view region V1 have an overlapping region Q1. The portion of the preset region P1 that does not overlap with the field of view region V1 is a non-overlapping region N1. The area of the overlap region Q1 is not less than 30% of the area of the field-of-view region V1. For example, but not limiting of, the area of the overlap region Q1 is 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100% of the area of the field of view region V1. When the proportion of the area of the overlapping region Q1 in the field of view region V1 reaches 100%, the overlapping region Q1 is the field of view region V1, and the field of view region V1 is a part of the preset region P1.

When no user's finger touches the field of view region V1, the detection beam 101 that can be totally reflected on the field of view region V1 includes a detection beam that is transmitted to the field of view region V1 by multiple total reflections from a non-overlapping region (the region where the preset region P1 does not overlap with the field of view region V1 is a non-overlapping region), or/and a detection beam 101 that enters the protective layer 11 from the light source 18 and then reaches the overlapping region Q1 for the first time and satisfies the total reflection at the overlapping region Q1.

Part or all of the detection light beam 101 irradiated onto the preset region P1 other than the overlap region Q1 can reach the field of view region V1 (including the overlap region Q1 of the field of view region V1 and the preset region P1 and the region where the field of view region V1 does not overlap the preset region P1) after being transmitted by total reflection. When the user's finger touches the field of view region V1: the detection light beam 101 entering from the light incident region 113 and reaching the overlap region Q1 for the first time is diffusely reflected at the ridge of the fingerprint and totally reflected at the opposite valley of the overlap region Q1; the detection light beam 101 transmitted from the portion outside the overlapping area of the preset area P1 to the field of view area V1 by total reflection also undergoes diffuse reflection at the ridges of the fingerprint and total reflection at the opposite valleys of the overlapping area Q1. The detection module 19 receives the diffusely reflected detection beam 101 at a side of the protective layer 11 away from the first surface and is used for fingerprint imaging. It should be noted that the first surface 111 is an outermost surface of the optical detection device 1 or an electronic product including the optical detection device 1, and the detection module 19 is located on a side of the protection layer 11 opposite to the outer side.

Optionally, in some embodiments, the preset region P1 may be located in the field of view region V1, or the field of view region P1 is located in the preset region P1, or the preset region P1 and the field of view region V1 are partially overlapped, or there is no overlap between the preset region P1 and the field of view region V1. When there is no overlap between the preset region P1 and the field of view region V1, the preset region P1 and the field of view region V1 are disposed at intervals or in close proximity. The embodiment of the utility model provides a do not limit this.

Alternatively, in some embodiments, the optical detection device 1 is applied to an electronic product, the electronic product includes a center line from a top end to a bottom end thereof, and the center of the field of view region V1 may be located on or near the center line.

Alternatively, in some embodiments, the optical detection device 1 is applied to an electronic product, the electronic product includes a center line from a top end to a bottom end of the electronic product, and the center of the predetermined area P1 may be located on or near the center line.

Optionally, in some embodiments, the optical detection apparatus 1 is applied in an electronic product, and the interval between the field of view region V1 and the bottom edge of the electronic product is 3 to 20 mm, or 3 to 15 mm, or 3 to 10 mm. Further optionally, in some embodiments, the light source 18 and the detection module 19 are both disposed near a bottom edge of the electronic product, the light source 18 is closer to the bottom edge of the electronic product than the detection module 19, and a horizontal distance between the detection module 19 and the light source 18 is 10 to 15 mm.

Referring to fig. 3, in the present embodiment, a point a exists in the light incident area E1, a point b exists in the overlapping area Q1, and the straight line ab is the shortest straight line between the light incident area E1 and the overlapping area Q1. The angle between the line ab and the overlap region 1 or the first surface 111 is not smaller than the critical angle for total reflection of the detection beam 101 in the protective layer 12. That is, the detection beam 101 with the shortest distance from the light incident region 113 to the overlapping region satisfies the condition of total reflection transmission in the protective layer 11, or the detection beam 101 projected directly from the light source 18 to the overlapping region through the second surface 112 can be transmitted by total reflection in the protective layer 11.

Optionally, in some embodiments, a shortest straight line exists between the light incident region 113 and the preset region P1, an included angle between the shortest straight line and a normal of the preset region P1 is not less than a critical angle at which the detection light beam 101 is transmitted by total reflection in the protective layer 11, or the detection light beam 101 in a shortest distance from the light incident region 113 to the preset region P1 satisfies a condition of transmission by total reflection in the protective layer 11, or the detection light beam 101 directly projected from the light source 18 to the preset region P1 through the second surface 112 satisfies a condition of transmission by total reflection in the light guide unit.

Optionally, in some embodiments, a shortest straight line exists between the light incident region 113 and the field of view region V1, and an included angle between the shortest straight line and a normal of the field of view region V1 is not less than a critical angle for total reflection transmission of the detection beam 101 in the protective layer 11, or a detection beam 101 at a shortest distance from the light incident region 113 to the field of view region V1 satisfies a condition for total reflection transmission in the protective layer 11, or a detection beam 101 projected directly to the overlapping region by the light source 18 through the second surface 112 satisfies a condition for total reflection transmission in the protective layer 11.

Alternatively, in some embodiments, it is understood that the detection light beam 101 emitted by the light source 18 can reach the light converter 17 and further enter the protective layer 11 from the light incident region E1. The light source 18 may be arranged anywhere in the optical detection device 1. For example, but not limited to, the light source 18 may be disposed below the display module 12 or the detection module 19 and conduct the emitted detection light beam 101 to the light converter 17 through a light guide element. The light guiding element may be a solid light guiding structure and/or the light guiding element may be a hollow light guiding structure. Alternatively, in some embodiments, the detection light beam 101 emitted by the light source 18 may directly reach the light incident region E1 without passing through a light guide element. As a further alternative, the light converter 17 may in some embodiments be omitted or integrated in the protective layer 11. For example, but not limited to, the protection layer 11 integrates the function of the light converter 17, the detection light beam 101 emitted by the light source 18 directly irradiates to the light incident region E1 without passing through another light conversion device, and the protection layer 11 deflects the incident angle of the detection light beam 101 entering from the light incident region E1 and directly irradiates to the predetermined region P1. When detecting a fingerprint, the ridges of the fingerprint contact the field of view region V1, and the valleys of the fingerprint have spacers with the corresponding portions of the field of view region V1. The spacer may be air, water, or the like. Typically, the spacer between the valley of the fingerprint and the field of view region V1 is air. Of course, the spacer between the valleys of the fingerprint and the field of view region V1 may be liquid or otherwise due to perspiration of the finger or the like. The embodiment of the present invention is described with the spacer as air, and it can be understood that other possible spacers also belong to the scope of the present invention, and the embodiment of the present invention is not limited thereto.

It is to be understood that although for illustrative purposes the present application is generally described in the context of fingerprints as an example, the optical detection apparatus 1 is not limited to the detection of fingerprints, and the detection object of the optical detection apparatus 1 can be any object to be imaged. Generally, a test object may have various characteristics including a biological characteristic. It should be noted that, as an example, the optical detection device 1 of the present invention is described with a finger print as a detection object, and it can be understood that lines such as palm, toe, palm print, skin surface texture and the like can also be used as the detection object or the feature of the external object to be detected.

Since the fingerprint has ridges and valleys, the ridges contact the first surface 111 (i.e. the outer surface of the optical detection device 1 for the user to touch) when detecting the fingerprint. In contrast, the valleys do not contact the first surface 111, with a spacer, such as but not limited to air, between the valleys and the first surface 111. It will be appreciated that the fingerprint may also have substances such as stains, ink, moisture, etc., and embodiments of the present invention are equally applicable to optical imaging of fingerprints having such substances.

The detection beam 101 is diffusely reflected at the ridges of the fingerprint. The detection module 19 is capable of receiving the detection beam 101 returning from the ridge through the protective layer 11 and the display module 12. The detection module 19 receives the detection beam 101 and converts the detection beam into an electrical signal. The electrical signal can be used for optical imaging of a fingerprint or fingerprint detection. The detection light beam 101 irradiated at the field-of-view region V1 opposite to the valley is totally reflected.

It should be noted that the overlapping of the field-of-view region V1 and the preset region P1 described in the present application includes: the field-of-view region V1 and the preset region P1 completely coincide, the field-of-view region V1 is a partial region of the preset region P1, the preset region P1 is a portion of the field-of-view region V1, or the preset region P1 and the field-of-view region V1 have a common partial region.

It should be noted that the drawings of the present invention are merely exemplary, and actually, the size of the ridges and valleys of the fingerprint is very small (about 300 to 500 micrometers), and the size of the fingerprint range to be detected in the fingerprint detection is about 4 mm x 4 mm to 10 mm x 10 mm, or a larger range area.

Although the light incident region E1 is located on the second surface 112 in the embodiment, the present invention is not limited thereto, and the light incident region E1 may be located at other positions of the protective layer 11. For example, but not limited to, the light incident region E1 may be located on one side of the protection layer 11, and the side of the protection layer 11 may be connected to the first surface 111 and the second surface 112 thereof. Alternatively, the light incident region E1 may be located on an inclined surface of the protective layer 11, and the inclined surface may have an inclined angle with respect to the first surface 111 or the second surface 112. Therefore, the light incident region E1 may be located at any suitable position of the protective layer 11, which is not limited by the present invention.

Alternatively, in another or modified embodiment, a portion of the detection light beam 101 directly irradiated to the preset region P1 satisfies a condition of total reflection transmission in the light guide unit 100, and another portion of the detection light beam 101 is refracted and/or reflected on the preset region P1.

Further alternatively, not less than 20% -30% of the detection beam 101 irradiated to the preset area P1 satisfies the condition of total reflection transmission within the protective layer 11. In this case, for example, but not limited to, the total power of the light source 18 may be 90mW (milliwatt) to 120mW, and when the light source includes 3 light emitting elements, the power of each light emitting element may be 30mA (milliampere) to 40mA, and the current may be 70 mA. Of course, the proportion of the detection light beam 101 which irradiates the preset region P1 and satisfies the condition of total reflection transmission may be greater than 30%, 40% or 50%, and the current or power of the light source 18 may be appropriately adjusted accordingly, so that the power consumption and heat generation can be reduced. When the proportion of the detection beam 101 which is irradiated to the preset area P1 and satisfies the total reflection transmission condition is less than 20% or 10%, the current or power of the light source 18 needs to be increased accordingly to satisfy the light intensity required for optical imaging of the fingerprint.

Alternatively, in another or modified embodiment, part or all of the detection beam 101 entering the protective layer 11 from the light-entering region E1 satisfies the condition of total reflection and transmission in the protective layer 11. The conditions of the total reflection transmission include: the detection beam 101 is totally reflected at the first surface of the protective layer 11, where it is not in contact with the ridges of the fingerprint, and on the second surface of the protective layer 11. The detection beam 101 is diffusely reflected at the first surface of the protective layer 11 where it contacts the ridges 1100 of the fingerprint 1000.

Optionally, in some embodiments, when the first surface 111 and the second surface 112 of the protection layer 11 are not disposed opposite to each other, for example, but not limited to, the first surface 111 is an upper surface of the protection layer 11, and the second surface 112 is a side surface of the protection layer 11, in this case, the protection layer 11 further includes a third surface opposite to the first surface 111. The detection beam 101 enters the protective layer 11 from the second surface 112, and can be totally reflected on the first surface 111 and the third surface, and then totally reflected and transmitted in the protective layer 11.

Optionally, in some embodiments, the incident angle of the detection light beam 101 deflected by the light converter 17 on the first surface 111 is greater than or equal to a preset threshold. Illustratively, the protective layer 11 is, for example and without limitation, transparent glass, and has a refractive index n1 of 1.5 and an air refractive index n0 of 1.0. The preset threshold may be 42 degrees. Optionally, the predetermined threshold is 42 degrees ± 3 degrees in some embodiments, taking into account material and assembly errors. Of course, in other or modified embodiments, when the material is different, the refractive index of different materials is different, and the predetermined threshold value can be changed accordingly, which all belong to the protection scope of the present invention. The embodiment of the utility model provides a do not limit this.

In this embodiment, the detection beam 101 is invisible light, including but not limited to near infrared light. The near infrared light is, for example, a light beam having a wavelength of 750 to 2000nm (nanometers). By way of example, but not limitation, the detection beam 101 is near infrared light having a wavelength of 800-1200 nm.

Optionally, the light emitting range of the detection light beam 101 emitted by the light source 18 along the length axis (Y axis) of the protection layer 11 has an angle of 10 to 50 degrees, and the light emitting range along the width axis (X axis) of the protection layer has an angle of 20 to 140 degrees. Optionally, in some embodiments, the light emitting range of the detection beam 101 along the length axis (Y axis) of the protection layer 11 has an angle of 20 to 30 degrees.

Optionally, in some embodiments, the detection light beam 101 emitted by the light source 18 includes two first light rays 101a and two second light rays 101b, the light rays 101a and 101b are located in a plane perpendicular to the first surface 111 along a length axis direction (i.e., a Y axis direction in fig. 1 and 2) of the protective layer 11, an included angle between the first light ray 101a and the second light ray 101b is α, and the included angle α is, for example and without limitation, not greater than 10 degrees, 20 degrees, 30 degrees, 40 degrees, and 50 degrees, where optionally, the light source 18 has a light exiting surface parallel to the first surface 111, and an included angle between the first light ray 101a and/or the second light ray 101b with respect to a normal of the first surface 111 is not greater than 10 degrees, 15 degrees, 20 degrees, and 25 degrees.

Fig. 4 is a schematic partial cross-sectional view of the optical detection apparatus 1 along line B-B in fig. 1. The light source 18 includes a light emitting unit 181. The number of the light emitting units 181 illustrated in fig. 4 is 4, but the present invention is not limited thereto, and the number of the light emitting units 181 may be one or more. As shown in fig. 4, the light emitting units 181 are arranged in a row in the X-axis direction. Optionally, the illustrated light source 18 further includes a circuit board 182. The light emitting unit 181 is electrically connected to the circuit board 182, and the circuit board 182 provides the light emitting unit 181 with electrical signals, such as, but not limited to, current, voltage, etc., required for light emission.

Please refer to fig. 5, which is a schematic diagram of the light source 18 shown in fig. 4, the detection light beam 101 emitted by the light emitting unit 181 further includes a third light ray 101c and a fourth light ray 101d, the third light ray 101c and the fourth light ray 101d are in a plane perpendicular to the first surface 111 along the X-axis direction, and an included angle β between the third light ray 101c and the fourth light ray 101d is not less than 20 degrees, optionally, for example, but not limited to, 20 degrees or less than β or less than 140 degrees, or β is 20 degrees, 30 degrees, 40 degrees, 50 degrees, 60 degrees, 70 degrees, 80 degrees, 90 degrees, 100 degrees, 110 degrees, 120 degrees, 130 degrees, and 140 degrees.

In the present embodiment, the detection beam 101 converted by the light converter 17 is a non-collimated beam. That is, the incident angles of the detection light beam 101 irradiated from the light incident region E1 to the preset region V1 may be different. The detection beam 101 is deflected by the light converter 17 to have a predetermined diffusion angle, for example, but not limited to, the horizontal diffusion angle of the deflected detection beam 101 on the horizontal plane (XY plane) including the length axis and the width axis is 10 degrees to 60 degrees, and the vertical diffusion angle on the XZ plane is 10 degrees to 60 degrees. The detection light beam 101 deflected by the light converter 17 includes a plurality of detection light rays, the horizontal diffusion angle can be regarded as an angle of projection of two detection light rays having the largest included angle on the XY plane, and the vertical diffusion angle can be regarded as an angle of projection of two detection light rays having the largest included angle on the XZ plane. Alternatively, in some embodiments, the horizontal spread angle of the deflected detection beam 101 on the inner horizontal plane (XY plane) including the length axis and the width axis of the protective layer 11 is 20 degrees to 80 degrees or 30 degrees to 140 degrees, and the vertical spread angle on the XZ plane is 20 degrees to 80 degrees or 30 degrees to 140 degrees.

It is understood that the area of the preset region P1 is larger than that of the light incident region E1 due to the divergence angle of the detection light beam 101.

The area of the perpendicular projection of the detection module 19 on the first surface 111 is smaller than the area of the field of view region V1, or the perpendicular projection of the detection module 19 on the first surface is located within the field of view region V1. The optical detection device 1 images by collecting the diffusely reflected detection light beam 101, thereby realizing fingerprint detection and identification. The diffusely reflected detection light beam 101 can enter the detection module 19 at different incident angles, and the detection module 19 has a small volume.

Of course, collimated light may also be used as the detection beam in some embodiments. It will be appreciated that if a collimated beam is used as the detection beam, this results in the width of the predetermined area being the same as the width of the light entrance area. Since electronic products capable of displaying images are mainly used for full-screen and narrow-frame applications, the area of the optical detection apparatus 1 for displaying images can be referred to as a visible area, and the portion around the visible area where no image is displayed is referred to as a frame area. The frame area is narrow, and the light-entering area 113 is generally located in the frame area of the optical detection apparatus 1 so as not to affect the image display of the visible area, and thus the width of the light-entering area 113 is also very small. Illustratively, the width of the light incident area E1 is 0.5 mm to 1 mm. Accordingly, the width of the preset region P1 is very small, and the viewing field region V1 is generally a rectangle with 5 mm × 5 mm or a circular region with a radius of 2 to 5 mm. Due to the parallel transmission characteristics of the collimated light, the width of the preset region P1 is smaller than the width of the field-of-view region V1. At this time, the following problems are likely to occur: there are some positions on the field of view region V1 where no detection beam can directly impinge, nor can the detection beam reach the field of view region V5 after total reflection. As shown in fig. 6, the presence of the partial area of the field of view area V1 where no detection beam is irradiated results in that the partial fingerprints corresponding to these positions cannot be detected. Therefore, although the detection beam of collimated light can also detect or optically image a fingerprint, it has a great disadvantage that the detection efficiency and the imaging quality for a fingerprint are inferior to those of the detection beam 101 of non-collimated light.

Of course, in other embodiments, a non-collimated detection beam 101 may also be used. Please refer to fig. 7. The non-collimated detection beam 101 passes through the protective layer 11 after being totally reflected, and can be further received by a detection module, at this time, it is equivalent to the optical detection device 1 receiving the totally reflected detection beam 101 for imaging and detection. For example, the non-collimated detection light beam 101 is totally reflected on the upper surface of the light guide unit 100, and then passes through the protection layer 11 of the optical detection apparatus 1 and is further received by the detection module. When detecting a fingerprint, a user touches the first surface 111 of the protective layer 11 with a finger to the predetermined area P1 directly illuminated by the detection light beam 101, and the detection light beam 101 illuminated to the ridge is diffusely reflected without being received by the detection module or the detection module receives the detection light beam 101 with a light intensity smaller than that of the incident light. The detection light beam 101 irradiated to other positions is totally reflected and is emitted to the display module 12 through an optical element attached to the lower surface of the protective layer 11, and can further pass through the display module 12 to be received by the detection module, and the total reflection light intensity of the part received by the detection module at the non-ridge position is the same as that of the incident light. Resulting in an image of the fingerprint with a contrast of light and shade. However, in these embodiments, it is necessary to provide an optical element on the second surface 112 of the protective layer 11, so that the detection beam 101 can exit from the lower surface after being totally reflected on the first surface 111 of the protective layer 11. The provision of the optical element necessarily leads to an increase in the cost and an increase in the assembly complexity of the optical detection apparatus 1. Moreover, in these embodiments, since the detection light beam 101 is non-collimated light, and has a certain divergence angle when it is projected on the preset region P1 of the first surface 111 of the protection layer 11, the width of the preset region P1 is larger than the width of the light incident region 113. Accordingly, the reflected light of the detection light beam 101 after being totally reflected in the preset area 15 also has a certain divergence angle, and therefore, it can be understood that the detection light beam 101 totally reflected to the lower surface of the protection layer 11 exits from the lower surface, and the exiting detection light beam 101 correspondingly has an exiting area with a width larger than that of the preset area P1 on the lower surface. Therefore, the fingerprint image formed by the detecting light beam 101 totally reflected to the second surface 112 and emitted will have a relatively serious amplification phenomenon, thereby causing the fingerprint image to be distorted. In addition, the area of the outgoing area of the detection beam 101 on the second surface 112 is larger, and accordingly, a detection module for receiving the outgoing detection beam 101 needs a larger volume and area to receive the detection beam 101 coming out of the outgoing area. For example, but not limited to, the detection module requires a larger photosensitive area, or a larger volume of lens, etc. For example, the detection module needs to be provided with a lens with a larger volume, and the cross-sectional area of the lens needs to be not smaller than the area of the preset region P1; or the detection module needs to be provided with a relatively large-sized image sensor, and the area of the photosensitive region of the image sensor receiving the detection light beam 101 needs to be not smaller than the area of the preset region P1. So, in order to set up this detection module, need crowd the space that occupies other parts originally even, these all can influence optical detection device's whole volume, cost and equipment, can not be applicable to and satisfy the demand that sets up at the inside electronic product such as cell-phone.

Furthermore, according to the optical principle of total reflection, the horizontal distance between the exit area of the totally reflected detection beam 101 on the second surface 112 of the protection layer 11 and the light source 18 is greater than the horizontal distance between the preset area P1 and the light source 18. Moreover, the exit directions of the detection beams 101 exiting from the exit area follow the reflection and refraction principles, so that the detection modules receiving these detection beams 101 need to be arranged on the corresponding exit light paths to ensure the receiving and imaging effects. Therefore, the horizontal distance between the detection module and the light source 18 is greater than the horizontal distance between the preset area P1 and the light source 18. The detection module needs to be located at a side of the predetermined area P1 away from the light source 18, the detection beam 101 needs to travel a further path inside the protection layer 11 to exit, and needs to travel a portion outside the predetermined area P1. In this way, if the protective layer 11 between the preset region P1 and the emission region is broken or broken, the detection beam 101 cannot be emitted from the emission region of the second surface 112 smoothly by total reflection. In other words, when the area outside the preset area P1 is damaged, the receiving and imaging of the detection light beam are affected, and the user experience is reduced.

When fingerprint detection is performed, including but not limited to, unlocking, payment and authentication of the optical detection device 1 or an electronic product including the optical detection device 1, the user's finger touches the field of view region V1. The area on the field-of-view area V1 that is in contact with the ridges of the fingerprint is defined as a ridge area, and the area opposite to the valleys of the fingerprint by spacers is defined as a valley area. The detection light beam 101 directly or indirectly irradiated to the ridge region after total reflection is subjected to diffuse reflection, and at least part of the diffusely reflected detection light beam 101 passes through the lower surface 122 of the transparent region 120 and the display module 11 to reach the detection module 19. The detection module 19 receives the detection beam 101 and converts it into a corresponding electrical signal, which may be used, for example and without limitation, to form a characteristic image of the fingerprint, or to represent a characteristic of the fingerprint.

The detection beam 301 that directly or indirectly irradiates the valley region after being transmitted by total reflection is totally reflected. Since the valley region is opposite to the valley of the fingerprint through the spacer, in the embodiment, the spacer is taken as air for example, and it can be understood by those skilled in the art that the spacer can be water, liquid, sweat stain, or other objects. Optionally, in other or modified embodiments, when detecting a fingerprint, a partial area of the preset area P1 does not contact with a ridge and is not opposite to a valley, and these areas are areas not covered by the fingerprint, and an area not covered by the fingerprint on the preset area P1 is defined as an empty area. The detection beam 101 directly impinging on the empty area is totally reflected.

Optionally, the optical detection apparatus 1 further includes a bracket, and the light source 18 may be fixedly connected or detachably connected to the bracket by glue, double-sided tape, adhesive, bolt, bracket, fastener, slot, welding, or the like. Optionally, the detection module 19 may be fixedly connected or detachably connected to a bracket by glue, double-sided tape, adhesive, bolt, bracket, fastener, slot, welding, or the like. Further alternatively, the bracket may be any component for fixedly connecting with the protective layer 11 and/or the display module 12. The light source 18 and the detection module 19 can be connected with the fixing frame 13 through the bracket, or: the support is a component of the fixed frame 13 or fixed frame 13.

In this embodiment, the display module 12 may be, for example, but not limited to, a liquid crystal display module, an electronic paper display module, a micro-display projector module, and the like. The display module 12 may include a display unit located under the protective layer 11 and a backlight unit located under the display unit. The backlight unit is used for providing backlight beams of visible light to the display unit, and the display unit is used for displaying images under the illumination of the backlight beams. The display unit and the backlight unit can transmit the detection light beam which is emitted from the lower surface of the light guide unit after being diffusely reflected at the finger ridge of the preset area. Further optionally, the detection module 19 is at least partially located below the backlight unit; or the detection module 19 is at least partially located inside the display unit, or the detection module 19 is at least partially located inside the backlight unit, or the detection module 19 is at least partially located between the display unit and the backlight unit.

Optionally, in other or modified embodiments, the display module 12 includes two opposite substrates and a display layer located between the substrates, and the display layer may be an Organic Light Emitting Diode (OLED) layer or a liquid crystal layer. It should be noted that the present invention is not limited thereto, and the display module 12 may be other suitable display modules, display modules or displays. Alternatively, in some embodiments, the display module 12 may be a self-luminous display device, and the display module 12 and the protective layer 11 together form a self-luminous display device.

In this embodiment or other modifications, the optical converter 17 includes one or more of an optical film, a grating, a diaphragm, an optical microstructure, a diffractive optical element, a lens, a prism structure, a spherical platform structure, a semi-cylindrical structure, or other optical structures, or a combination thereof. Alternatively, in some embodiments, the light converter 17 may also be omitted or integrated in the protective layer 11. Optionally, in some embodiments, the light converter 17 is disposed between the light emitting surface of the light source 18 and the lower surface of the protective layer 11, or the light converter 17 and the protective layer 11 are integrally formed, and the light incident region E1 is a partial surface of the light converter 17.

In this embodiment, the light source 18 is located below the light converter 17 and spaced apart from the light converter 17. The spread angle of the light source 18 in the Y-axis direction on the XY-plane is smaller than the spread angle thereof in the X-axis direction. The light emitting units 181 are arranged in a row in the X-axis direction. In order to increase the utilization of the detection light beam 101 emitted by the light source 18, the light converter 17 has a substantially elongated rectangular shape corresponding to the elongated shape of the light source 18. Preferably, the light converter 17 is a multilayer optical film or a diffractive optical element. Of course, the light converter 17 may be, for example, a prism, an optical microstructure, or the like, but the present invention is not limited thereto.

Alternatively, in some embodiments, the width (along the Y-axis direction) of the light emitting unit 181 is 0.5 mm, and the light emitting unit 181 is a top surface light emitting type light emitting element. Illustratively, the size of the light emitting unit 181 is 1 mm x 0.5 mm x 1 mm. Alternatively, in some embodiments, the light emitting unit 181 may be a side light emitting type light emitting element.

Alternatively, in some embodiments, the number of the preset regions P1 may be multiple, for example, but not limited to, different preset regions P1 are respectively provided near the top and the bottom of the protection layer 11.

Alternatively, in some embodiments, the number of the light incident regions E1 may be multiple, for example, but not limited to, different light incident regions E1 are respectively provided near the top and the bottom of the protective layer 11.

Alternatively, in some embodiments, the number of the light sources 18 may be multiple, for example, but not limited to, the light sources 18 may be disposed under the non-transparent region 110 of the protective layer 11 at different positions corresponding to the non-transparent region 110.

Optionally, in some embodiments, the refractive index of the light converter 17 is greater than the refractive index of the protective layer 11. It is understood that, when the detection light beam 101 enters the protective layer 11 from the light incident region E1, refraction occurs at the interface of the light converter 17 and the light incident region E1, and the angle of refraction is larger than the angle of incidence.

Optionally, in some embodiments, the light converter 17 has an input surface and an output surface opposite to each other, the input surface faces the light source 18, the output surface faces the non-transparent region 110, the input surface is used for receiving the detection light beam 101 emitted from the light source 18, and the output surface is used for projecting the detection light beam with a predetermined incident angle to the lower surface of the non-transparent region 110 of the protection layer 11.

Optionally, the protective layer 11 comprises a midline from its top end to its bottom end, the light converter 17 is located at or near the midline of the non-transparent region near the bottom end of the protective layer 11, and the light converter 17 has a rectangular shape with a width and length in the range of 1 mm to 50 mm. Alternatively, the light converter 17 may have any other shape or size that meets the product requirements, such as but not limited to a circle, an ellipse, a rectangle with rounded corners, etc., and the size of the light converter 17 may have different sizes as required, which is not limited by the present invention.

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

Optionally, in some embodiments, the light emitting unit 181 has a light emitting surface facing the optical converter 17 and a lower surface of the connection circuit board 182, and a shorter side length of the light emitting surface of the light emitting unit 181 is not greater than 0.5 mm. As a further alternative, the light source 18 may further include a circuit board 182, and the shorter side of the circuit board 182 is no greater than 1 mm.

Optionally, in some embodiments, the number of the light emitting units 181 may be one or more, such as but not limited to: 1, 2, 3, 4 or more.

Optionally, the shape of the preset area P1 and/or the viewing area V1 may be square, circular, oval, and the like, which is not limited in the embodiment of the present invention. Optionally, the field of view region V1 is circular with a radius in the range of 2 to 5 mm or 3 to 4 mm or 3 to 5 mm.

Optionally, the light emitting unit 181 is, for example, but not limited to, one or more of an LED (light emitting diode), an LD (laser diode), a VCSEL (vertical cavity surface emitting laser), a Mini-LED, a Micro-LED, an OLED (organic light emitting diode), and a QLED (quantum dot light emitting diode), or a light emitting array including one or more of an LED, an LD, a VCSEL, a Mini-LED, a Micro-LED, an OLED, and a QLED.

Optionally, in some embodiments, the protective layer 11 includes a transparent substrate and an optical film layer. The transparent substrate includes a portion located in the non-transparent region 110 and a portion located in the transparent region 120. The optical film layer, which is located under the transparent substrate opposite to the non-display area 110, can be used to transmit the detection beam 301 and intercept visible light. The light converter 17 may be formed on the lower surface of the optical film layer, or the light converter 17 may be integrally formed with the optical film layer. As a further alternative, the optical film layer may be omitted. At this time, the non-transparent region 110 of the protective layer 11 may be made of a material opaque to visible light. Further optionally, the optical film layer may be integrated on the lower surface, the upper surface, and the inside of the substrate. Further optionally, the transmittance of the optical film layer to the detection light beam 101 is greater than 50%, or 60%, or 70%. The optical film layer has a transmittance of less than 10%, or 5%, or 1% for visible light. Further optionally, the optical film layer is, for example, but not limited to, infrared ink. In other or modified embodiments, the optical film layer may have different structures and functions according to design requirements, and the embodiment of the present invention does not limit this.

The optical detection device 1 uses the non-collimated detection light beam 101, directly projects the detection light beam 101 to the overlapping area of the preset area P1 and the view field area V1, transmits the detection light beam 101 passing through the non-overlapping area of the preset area P1 to the view field area V1 through total reflection, and receives the detection light beam 101 subjected to diffuse reflection at the contact position of the view field area V1 and the ridge of the fingerprint below the display module 12, so that the optical image of the fingerprint touching the view field area V1 can be captured, and the fingerprint detection under the screen is realized.

It should be noted that, although the protective layer 11 is used as a medium for detecting the total reflection and transmission of the light beam 101 in the above embodiments, the embodiments of the present invention are not limited thereto. In some embodiments, the detection light beam 101 enters the protective layer 11 from the light incident region E1 on the lower surface of the non-display region 110 of the protective layer 11, and the detection light beam 101 may be transmitted by total reflection at least in the protective layer 11. For example, but not limited to, the display device 10 further includes an optical adhesive connecting the protective layer 11 and the display module 12, the detection beam 101 may be transmitted by total reflection in the protective layer 11, or the detection beam 101 may be transmitted by total reflection in the protective layer 11 and the optical adhesive, or the detection beam 101 may be transmitted by total reflection in the protective layer 11, the optical adhesive, and at least a portion of the display module 11. Further, for example, but not limited to, the display module 12 includes a display unit below the protective layer 11 and a backlight unit below the display unit, and the detection beam 101 may be transmitted by total reflection in the protective layer 11, the optical glue and at least a part of the display unit.

Therefore, the utility model discloses optical detection device 1 can be through utilizing detection light beam 101 is in total reflection transmission in optical detection device 1's different subassemblies and/or medium to and detection module 19 receives and converts the signal of telecommunication after the detection light beam 101 diffuse reflection of the ridge contact department of the regional V1 of visual field, and fingerprint is realized to the optical image of acquisition fingerprint and fingerprint detection and discernment.

Optionally, in some embodiments, the detection module 19 may further include a processor and a memory, and the processor may be capable of obtaining fingerprint information of the user according to the received detection light beam 101, such as, but not limited to, a fingerprint image including ridge/valley contrast. The memory stores the biological characteristic information data in advance, and the processor can compare the acquired fingerprint information with the pre-stored fingerprint information data, so that fingerprint detection and identification are realized. Through detecting and discerning the fingerprint, the utility model discloses optics detection device 5 can be used to the locking or the unblock of electronic product, and online payment service is verified, financial system or public security system's authentication, access control system's multiple products such as pass verification and application scene.

It should be noted that the close/contact in the description of the present invention and claims may refer to, for example but not limited to: bonded together by lamination, either in close proximity or close proximity with a gap, or tightly connected by an optical medium. The utility model discloses do not limit to this.

To sum up, the utility model discloses an optical detection device 1 can utilize protective layer 11 as the leaded light unit at least, and detection light beam 101 can be the transmission of total reflection in the leaded light unit. The detection beam 101 is incident into the protective layer 11 at an angle satisfying a total reflection transmission condition and may be irradiated to the preset region P1. The preset area P1 is an irradiation area of the detection beam 101 on the first surface 111 of the protective layer, and the field of view area V1 is an area touched by a finger of a user during fingerprint detection. The preset region P1 and the field region V1 have an overlapping region Q1, and the detection beam 101 irradiated to the overlapping region Q1 corresponds to a ridge capable of being directly irradiated to a fingerprint. The detection light beam 101 irradiated to the non-overlapping area where the preset area P1 does not overlap the field of view area V1 can reach the field of view area V1 after being transmitted by total reflection for a plurality of times. Since the valleys of the fingerprint and the field of view region V1 have an air space therebetween, the detection beam 101 is totally reflected at a position where the field of view region V1 and the valleys are opposed, and can be transmitted by total reflection within the light guide unit. Due to the direct contact between the ridge of the fingerprint and the preset area, the detection light beam 101 is diffusely reflected at the position where the field area V1 and the ridge are in contact, and a part of the diffusely reflected detection light beam 101 can be received by the detection module 19 after passing through the lower surface of the transparent area 120. The detection beam 101 is non-collimated and/or collimated light, including but not limited to non-collimated near infrared light. The detection module 19 receives the detection light beam 101 subjected to diffuse reflection to perform imaging, and because the light beam characteristic of diffuse reflection is divergent towards all directions in space, at least part of the detection light beam 101 subjected to diffuse reflection is emitted from the lower surface of the light guide unit, at least part of the detection light beam 101 emitted from the lower surface of the light guide unit can be received by the detection module 19, and the detection light beam 501 can have different incident angles when entering the detection module 19.

Therefore, the detection module 19 can be disposed substantially directly below the viewing area V1 to receive the diffusely reflected detection beam 101. Of course, the detection module 19 can be disposed at any position of the optical detection apparatus 1, as long as the detection module 19 can receive the detection light beam 101 from the diffuse reflection of the ridge, and is the protection scope of the present invention. The utility model discloses do not limit to this. The horizontal distance between the detection module 19 and the light source 18 may be smaller than or equal to the horizontal distance between the field of view region V1 and the light source 18. In this embodiment, the horizontal distance between the detection module 19 and the light source 18 is about 10-15 mm. Of course, alternatively, in some embodiments, the detection module 19 may be disposed adjacent to the light source 18, and the horizontal distance between the detection module 19 and the light source 18 may be less than 10 mm, 8 mm, or 5 mm.

When the detection module 19 is located below the view field region V1, the path of the detection light beam 101 transmitted in the light guide unit is short, and the detection light beam 101 does not need to be transmitted by total reflection in other regions of the light guide unit. Therefore, the energy loss of the detection beam 101 received by the detection module 19 is small. In addition, as described above, the size or volume of the detection module 19 is small, so that the requirement of being installed inside an electronic product such as a mobile phone can be satisfied.

Therefore, the optical detection device 1 and the modified embodiment of the present invention adopt the non-collimated detection beam 101, the non-collimated detection beam 101 can directly irradiate the whole preset region P1, so that the detection beam 101 directly reaching the ridge of the fingerprint has more energy, and the fingerprint information of the whole preset region P1 can be detected. The utility model discloses optical detection device 1 and its change embodiment have better fingerprint detection effect.

Referring to fig. 8 and 9, in an alternative embodiment of the optical detection device 1, the optical detection device 1a and the optical detection device 1 have substantially the same structure, and the reference numerals of the elements are the same for describing the directions. The optical detection device 1a and the optical detection device 1 are different in that: the light converter 17 and the second surface 112 of the protective layer 11 have an air gap, for example, but not limited to, a frame-mounted arrangement between the light converter 17 and the second surface 112, or a distance between the light converter 17 and the second surface 112.

In some embodiments, the light converter 17 and the second surface 112 may be spaced apart by 0-1 mm, 1 mm-1.5 mm, 1.5 mm-2 mm, or greater than 2 mm.

Due to the air gap between the light converter 17 and the second surface 112, at least a part of the detection light beam 101 deflected by the light converter 17 is refracted into the protective layer 11 through the air, and the part of the detection light beam 101 entering the protective layer 11 will not be totally reflected. At this time, after the light converter 17 deflects the detection light beam 101 toward the field of view region V1, at least a part of the detection light beam 101 enters the protective layer 11 through air and exits from the first surface 111. The detection beam 101 has a predetermined area P1 directly illuminated on the first surface 111. The detection light beam 101 exits from the preset area P1 to above the protective layer 11. The outgoing detection beam 101 can enter the inside of the finger 1000, and the detection beam 101 is transmitted inside the finger 1000 and then is transmitted out from the ridges and valleys of the finger 1000, respectively. The detection beam 101 mainly refracts at the valleys and ridges and emits the detection beam 101 different in light intensity. The detection beam 101 refracted from the ridges and valleys into the protective layer 11 is able to pass through the protective layer 11 and the display module 12 to reach the detection module 19. The detection module 19 receives the detection light beam 101 and converts it into an electrical signal that can be used to generate a fingerprint image with contrast corresponding to ridges and valleys. The preset region P1 and the field of view region V1 shown in fig. 8 are spaced apart and do not overlap, in other or modified embodiments, the preset region P1 and the field of view region V1 may have an overlapping region having an area no greater than 30%, 25%, 20%, 15%, 10%, 5% of the area of the field of view region V1; or the preset region P1 and the field-of-view region V1 do not overlap but are disposed with edges in close proximity.

The optical detection device 1a performs optical imaging of a fingerprint using the detection beam 101 transmitted from the finger 1000, thereby obtaining a fingerprint image of ridges and valleys with contrast, and thus, fingerprint detection and recognition are realized. The optical detection device 1a receives transmitted detection light beams 101 from both ridges and valleys, while the optical detection device 1 receives only detection light beams 101 from diffuse reflection at the ridges. Ideally, the optical detection device 1 has a better image contrast, but the optical detection device 1a has a better Versatility (Versatility).

Optionally, in some embodiments, the detection beam 101 is reflected on the surface of the finger 1000, and the detection module 19 can receive the detection beam 101 reflected on the surface of the finger 1000 and is used for fingerprint imaging.

With the above embodiments, the detection module 19 in the embodiment of the present invention receives the detection light beam 101 returned by the finger 1000 that can receive the outside and is used for fingerprint detection, the detection light beam 101 returned by the finger 1000 includes but is not limited to: the detection beam 101 is diffusely reflected at the ridges of the fingerprint, and/or the detection beam 101 is transmitted by the finger 1000 after entering the inside of the finger 1000, and/or the detection beam 101 is reflected at the surface of the finger 1000.

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

In this application,

optical detection device

1 or 1a can be cell-phone, panel computer, intelligent wrist-watch, augmented reality/virtual reality device, human action detection device, autopilot car, intelligent household equipment, security protection equipment, medical equipment, intelligent robot etc. or foretell subassembly.

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

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

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

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

The orientations or positional relationships indicated in the specification of "length", "width", "upper", "lower", "left", "right", "front", "rear", "back", "front", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., which may appear in the present invention, are orientations or positional relationships indicated on the basis of the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Like reference numbers and letters refer to like items in the figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance. In the description of the present invention, "plurality" or "a plurality" means at least two or two unless specifically defined otherwise. In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, "disposed," "mounted" or "connected" is to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

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

Claims

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

the display device comprises a protective layer, a display module and a fixing frame, wherein the display module is positioned below the protective layer, the fixing frame is used for accommodating the protective layer and the display module, the protective layer comprises a first surface and a second surface, the display module is positioned on one side of the protective layer, which is far away from the first surface, and the display module can emit visible light to the outside of the first surface through the protective layer so as to display an image;

the light source is positioned on one side of the second surface, emits a detection light beam above the first surface of the protective layer and is connected with the bottom or the side part of the fixed frame;

the light converter is positioned in a non-display area between the light source and the first surface of the protective layer, the detection light beams are transmitted to the light converter from the light source through a space between the side part of the fixing frame and the display module, the light converter is used for enabling at least part of the detection light beams emitted by the light source to enter the protective layer from the second surface after being deflected according to a preset diffusion angle, and part or all of the detection light beams meet the condition of total reflection transmission at least in the protective layer;

the detection module is positioned below the protective layer, receives detection light beams returned by an external object through the protective layer and converts the detection light beams into electric signals to acquire biological characteristic information of the external object, wherein the detection module is provided with a field area on the first surface, and the optical converter deflects the detection light beams emitted by the light source towards the direction of the field area.

2. The optical inspection device of claim 1, wherein the optical converter is fully attached to the second surface of the protection layer, at least a portion of the inspection beam is capable of being transmitted by total reflection in at least the protection layer, an area where the inspection beam reaches the first surface for the first time is defined as a predetermined area, when no finger is in contact with the predetermined area, the inspection beam is totally reflected in the field of view, when a finger is in contact with the field of view, at least a portion of the inspection beam is diffusely reflected at a contact point of the field of view and a ridge of the fingerprint, and the inspection module receives the diffusely reflected inspection beam.

3. The optical inspection device of claim 2, wherein the protective layer has a non-transparent region and a transparent region, the non-transparent region being located around the transparent region; the light source is located below the non-transparent area of the protective layer, the light converter is located between the light source and the non-transparent area of the protective layer, a detection light beam emitted by the light source enters the protective layer from the non-transparent area after being deflected by the light converter and can directly irradiate the preset area located on the first surface, and at least part of the preset area is located in the transparent area.

4. The optical inspection device according to claim 3, wherein the overlap region exists between the predetermined region and the field of view region, the inspection beam directly irradiated to the overlap region satisfies a condition of total reflection transmission in the protective layer, and at least a part of the inspection beam in the non-overlap region where the predetermined region does not overlap the field of view region can reach the field of view region after total reflection transmission.

5. The optical inspection device of claim 1 wherein the light source and the light converter are spaced apart by a distance of 1 mm, 2 mm, 3 mm, 4 mm, 5 mm.

6. The optical inspection device of claim 1, wherein the light source includes a light emitting unit and a circuit board, the light emitting unit having a light emitting surface facing the light converter and a lower surface connected to the circuit board.

7. The optical inspection device of claim 6, wherein the shorter side of the light exit surface is no greater than 0.5 mm, and/or the shorter side of the circuit board is no greater than 1 mm.

8. The optical detection device according to claim 1, wherein the light source includes a plurality of light emitting units, the light emitting units being light emitting elements of a top emission type or a side emission type, the light emitting units having light emitting angles of not more than 10 degrees, 20 degrees, 30 degrees, 40 degrees, 50 degrees in a length axis direction of the protective layer, the light emitting units having light emitting angles of between 40 degrees and 140 degrees in a width axis direction of the protective layer.

9. The optical inspection device of claim 1, wherein the inspection module is at least partially disposed under the display module, the inspection beam is diffusely reflected at the ridges of the fingerprint at the first surface of the protective layer back into the protective layer and further exits through the second surface of the protective layer, the inspection module is capable of receiving the inspection beam exiting from the protective layer through at least a portion of the display module and converting the inspection beam into an electrical signal, the light source and the orthographic projection of the display module on the first surface of the protective layer are not overlapped or partially overlapped, and the orthographic projection of the light source on a plane perpendicular to the first surface is disposed under the orthographic projection of the display module on the plane.

10. The optical inspection device of claim 1, wherein the display module comprises a display unit and a backlight unit, the display unit is disposed below the passivation layer, the backlight unit is disposed below the display unit, the display unit is used for displaying images, the backlight unit is used for providing backlight beams of visible light required for displaying images for the display unit, and the inspection module is disposed below the backlight unit, or at least a portion of the inspection module is disposed inside the display unit, or at least a portion of the inspection module is disposed between the backlight unit and the display unit.

11. The optical inspection device of claim 1 wherein the optical converter is one or more of a diffractive optical element, a grating, a diaphragm, a lens, a prism, an optical film, an optical microstructure.