CN211087266U

CN211087266U - Optical detection device

Info

Publication number: CN211087266U
Application number: CN201922298961.6U
Authority: CN
Inventors: 林峰; 王小明
Original assignee: Shenzhen Fushi Technology Co Ltd
Current assignee: Shenzhen Fushi Technology Co Ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2020-07-24
Anticipated expiration: 2029-12-19

Abstract

The utility model discloses an optical detection device, including display device, display device includes: the protective layer is provided with a first surface for user touch and interaction realization and a second surface opposite to the first surface, and the display module is positioned on one side of the second surface of the protective layer. The emission module is positioned below the protective layer and used for emitting detection light beams, the detection light beams can enter the protective layer from the second surface, one part of the detection light beams entering the protective layer is emitted from the first surface, and the other part of the detection light beams is at least transmitted in the protective layer in a total reflection manner; the detection module is positioned below the protective layer and at least partially positioned below the display module or inside the display module, and is used for receiving the detection light beams returned by the external object and converting the received detection light beams into corresponding electric signals so as to obtain the biological characteristic information.

Description

Optical detection device

Technical Field

The utility model relates to the field of photoelectric technology, especially, relate to an optical detection device and electronic equipment that utilize optical imaging to realize biological feature detection.

Background

In order to achieve a full screen or nearly full screen effect, the biometric detection technology under the screen is well established, some electronic products adopt an O L ED display screen, collect visible light reflected back by a finger under the O L ED display screen, and utilize fingerprint feature information carried by the visible light emitted by the O L ED itself after being reflected on the finger to achieve fingerprint detection, however, for non-self-luminous displays such as a liquid crystal display (L CD), because of different screen structures and display principles, the liquid crystal display generally needs to utilize the visible light provided by a backlight unit to achieve display, and the visible light cannot well penetrate through the backlight unit, so that the visible light reflection mode adopted on the OE L D cannot well achieve fingerprint detection under L CD or other biometric features.

SUMMERY OF THE UTILITY MODEL

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

An aspect of the present invention provides an optical detection apparatus, including: a display device, the display device comprising: a protective layer having a first surface for user touch and interaction and a second surface opposite the first surface; the display module is arranged adjacent to the second surface and can emit visible light through the protective layer to realize image display; the emission module is positioned below the protective layer and used for emitting a detection light beam, the detection light beam can reach an external object and return, and the detection light beam is invisible light; the detection module is located below the protective layer and at least partially located below the display module or inside the display module, the detection module is used for receiving detection light beams returned from an external object and converting the detection light beams into corresponding electric signals to obtain biometric information, the detection module has a field angle range, an area of the first surface located in the field angle range is a field area, and the detection light beams include: a first light beam capable of entering the protective layer and totally reflecting within the protective layer at least the first light beam transmitted to the field of view region, and a second light beam capable of passing through the protective layer and exiting from a region outside the field of view region of the first surface above the protective layer; the proportion of the first light beam and the second light beam in the amount of the detection light beam is defined as the composition proportion of the first light beam and the second light beam; the control unit is connected with the transmitting module and used for controlling the transmitting module to transmit the detection light beams of the first light beam and the second light beam with different composition ratios.

The beneficial effects of the utility model reside in that, the utility model discloses optical detection device's transmission module can launch the measuring beam of the first light beam that has different component proportions and second light beam, the measuring beam that the measuring module received the outside object and returned converts the biological characteristic detection of the realization outside object that the corresponding signal of telecommunication can be better into. The utility model discloses can satisfy the biological characteristic detection needs of different environment and scene.

Drawings

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

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

FIG. 2B is a schematic partial cross-sectional view of one embodiment of the optical detection device shown in FIG. 2A;

FIG. 3A is a schematic view of an alternate embodiment of the optical detection device of FIG. 1;

FIG. 3B is a schematic partial cross-sectional view of the optical detection device shown in FIG. 3A;

fig. 4 is a schematic partial cross-sectional view of an embodiment of the optical inspection device of the present invention;

FIG. 5 is a partial schematic view of one embodiment of a light converter of the optical detection device shown in FIG. 4;

FIG. 6 is a partial schematic view of one embodiment of a light converter of the optical detection device of FIG. 4;

FIG. 7 is a partial schematic view of one embodiment of a light converter of the optical detection device of FIG. 4;

FIG. 8 is a partial schematic view of one embodiment of a light converter of the optical detection device of FIG. 4;

fig. 9A and 9B are schematic diagrams of an embodiment of the optical detection apparatus of the present invention;

FIG. 10 is a block diagram of the optical detection device shown in FIGS. 9A-9B;

fig. 11A and 11B are schematic diagrams of an embodiment of the optical detection apparatus of the present invention;

fig. 12A and 12B are schematic diagrams of an embodiment of the optical detection apparatus of the present invention.

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.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. 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 and fig. 2A, fig. 1 is a schematic diagram of an embodiment of an optical detection apparatus 1 of the present invention. FIG. 2A is a schematic partial cross-sectional view of the optical detection device 1 of FIG. 1 taken along line A-A. The optical detection device 1 comprises a display device 10, an emission module 18 and a detection module 19.

The display device 10 includes a protective layer 11 and a display module 12. 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 protection layer 11 is used for protecting the display module 12 from the external environment. The display module 12 is, for example and without limitation, a liquid crystal display module, and the display device 10 is, for example and without limitation, a liquid crystal display device or a liquid crystal display screen.

The protective layer 11 includes opposing first and

second surfaces

111 and 112. The display module 12 is located on one side of the second surface 112 of the protection layer 11. The protective layer 11 has a transparent region 120 and a non-transparent region 110 located around the transparent region 120. The transparent region 120 can transmit visible light, and the non-transparent region 110 can block visible light.

Optionally, the emission module 18 is located below the non-transparent region 110 of the protection layer 11. The display module 12 is partially or completely located under the transparent region 120 of the protection layer 11. The orthographic projection of the emission module 18 and the display module 12 on the first surface 111 are not overlapped or partially overlapped. The detection module 19 is partially or completely located below the display module 12. Optionally, in some embodiments, the detecting module 19 is partially or completely located inside the display module 12.

The protective layer 11 includes a transparent substrate 11a and an optical film layer 11 b. The transparent substrate 11a is a main body of the protective layer 11, and the optical film layer 11b is attached to a part of the lower surface of the transparent substrate 11 a. The non-transparent region 110 of the protection layer 11 is formed by the optical film layer 11b and a portion of the transparent substrate 11a facing the optical film layer 11 b. The transparent region 120 of the protective layer 11 is formed by a portion of the transparent substrate 11a not facing the optical film layer 11 b.

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.

Alternatively, the first surface 111 may include an upper surface of the transparent substrate 11a, and the second surface 112 may include a lower surface of the optical film layer 11b opposite to the transparent substrate 11a and a portion of the lower surface of the transparent substrate 11a not facing the optical film layer 11 b.

The transparent substrate 11a is, for example, but not limited to, glass, plastic, resin, or any other transparent material. The optical film layer 11b is, for example, but not limited to, an infrared ink capable of transmitting near infrared light and blocking visible light.

Alternatively, in some embodiments, the optical film layer 11b may be omitted or integrated in the transparent substrate 11 a.

It is understood that the protective layer 11 may include a plastic film, a toughened film, or other films that are attached by a user during actual use, and the first surface 111 of the protective layer 11 is a surface that the external object 1000 directly contacts during biometric detection. The first surface 111 is the outermost of the optical detection apparatus 1, or the first surface 111 is the outermost of an electronic device comprising the optical detection apparatus 1. Here, for example, but not limited to, the external object 1000 may be a finger and the biometric detection may be fingerprint detection or fingerprint feature detection.

The emission module 18 emits a detection beam 101, and the detection beam 101 can enter the protective layer 11 from the second surface 112. A part of the detection beam 101 entering the protective layer 11 can be refracted from the first surface 111 and then exit above the protective layer 11, and a part of the detection beam 101 entering the protective layer 11 satisfies a condition of total reflection transmission at least within the protective layer 11.

Optionally, in some embodiments, the detection module 19 has a field angle, an area of the first surface 111 within a range of the field angle of the detection module 19 is a field area V1, and the detection light beam 101 entering into the protective layer 11 includes: a partial detection beam 101 capable of passing through the protective layer 11 and exiting from an area of the first surface 111 other than the field of view area V1 to above the first surface 111, and a partial detection beam 101 capable of being transmitted to the field of view area V1 by total reflection at least within the protective layer 11. The part of the detection beam 101 totally reflected at least within the protective layer 11 and transmitted to the viewing area V1 may be defined as a first beam, and the part of the detection beam 101 capable of passing through the protective layer 11 and exiting from an area outside the viewing area V1 of the first surface 111 to above the first surface 111 may be defined as a second beam. The proportion of the first light beam and the second light beam in the detection light beam 101 is the composition proportion of the first light beam and the second light beam. The emission module 19 may emit the detection beam 101 having the first beam and the second beam with different composition ratios.

Fig. 2B is a partial schematic view of an alternative embodiment of the optical detection apparatus 1 shown in fig. 2A, and fig. 2B shows a partial specific structure of the display module 12. As shown in fig. 2B, the display module 12 includes a display panel 121 located below the protective layer 11, and a backlight module 122 located below the display panel 121. The backlight module 122 provides visible light, and the display panel 121 displays information by using the visible light. The optical detection device 1 further comprises an optical adhesive layer 14 for connecting the display panel 121 and the protective layer 11. The display panel 121 includes a lower polarizer 1211, an array substrate 1212, a liquid crystal layer 1213, a color filter substrate 1214, and an upper polarizer 1215 sequentially arranged from bottom to top. The optical glue layer 14 connects the lower surface 112 of the protective layer 11 and the upper polarizer 1215.

The backlight module 122 includes a reflective sheet 1221, a light guide plate 1222, and an optical film 1223 stacked in sequence from bottom to top, the light guide plate 1222 includes a bottom surface (not numbered) facing the reflective sheet 1221, a top surface (not numbered) facing the optical film 1223, and a side surface (not numbered) between the bottom surface and the top surface, the backlight module 122 further includes a backlight (not shown) disposed adjacent to one side surface of the light guide plate 1222, the backlight emits visible light as a backlight beam, the backlight beam enters the light guide plate from the side surface of the light guide plate and can exit from the top surface of the light guide plate, and the reflective sheet 1221 is configured to reflect the backlight beam that exits from the bottom surface of the light guide plate 1222 back to the light guide plate 1222. The optical film 1223 is used to diffuse and/or brighten the backlight beam exiting from the top surface of the light guide plate 1222 and then provide the backlight beam to the display panel 121, and the reflective sheet 1221, the light guide plate 1222, and the optical film 1223 are capable of transmitting the detection beam 101.

A part of the detection beam 101 may be transmitted by total reflection within the protective layer 11; or a part of the detection beam 101 can be transmitted in a total reflection way in the protective layer 11 and the optical glue layer 14; or a part of the detection beam 101 may be transmitted by total reflection within the protective layer 11, the optical glue layer 14, the upper polarizer 1215; or a part of the detection beam 101 may be totally reflected and transmitted in the protective layer 11, the optical adhesive layer 14, the upper polarizer 1215 and the color film substrate 1214; or a part of the detection beam 101 may be totally reflected and transmitted in the protective layer 11, the optical adhesive layer 14, the upper polarizer 1215, the color film substrate 1214 and the liquid crystal layer 1213; or a part of the detection beam 101 may be transmitted by total reflection in the protective layer 11, the optical adhesive layer 14, the upper polarizer 1215, the color film substrate 1214, the liquid crystal layer 1213, and the array substrate 1212; or a part of the detection beam 101 may be transmitted by total reflection in the protective layer 11, the optical adhesive layer 14, the upper polarizer 1215, the color film substrate 1214, the liquid crystal layer 1213, the array substrate 1212, and the lower polarizer 1211; or a part of the detection beam 101 may be totally reflected and transmitted in the protective layer 11, the optical adhesive layer 14, the upper polarizer 1215, the color film substrate 1214, the liquid crystal layer 1213, the array substrate 1212, the lower polarizer 1211, and at least a part of the backlight module 122.

Alternatively, a part of the detection beam 101 may be transmitted by total reflection within at least the protective layer 11.

Alternatively, a part of the detection beam 101 may be transmitted by total reflection within the protective layer 11 and at least a part of the display panel 121. Optionally, a part of the detection beam 101 may be transmitted by total reflection in the protective layer 11 and at least a part of the display module 12.

For convenience of description, in the present specification and claims, a portion of the detection beam 101 that can be transmitted by total reflection at least within the protective layer 11 is defined as a first beam 101a, and a portion of the detection beam 101 that can exit from the first surface 111 is defined as a second beam 101 b.

The detection module 19 can receive the detection beam 101 returned from the external object 1000 through the protective layer 11 and at least a part of the display module 12. The part of the first surface 111 located in the field angle range of the detection module 19 is a field area V1 of the detection module 19 on the first surface 111. Optionally, in some embodiments, the detection module 19 includes an image sensor and a lens, and the angle of view of the detection module 19 is the angle of view of the lens. In some embodiments, the detection module 19 may include an image sensor lens array. The number of the image sensors may be one or more, and the number of the lens/lens array may be one or more.

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. 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. 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, 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 first light beam 101a diffusely reflected at the position where the external object 1000 contacts the field of view area V1 is divergently emitted in various directions in space, and the detection module 19 can receive the diffusely reflected first light beam 101a having different incident angles. Since the external object 1000 has uneven surface, the second light beam 101b transmitted from the external object 1000 also has different outgoing angles, and the detection module 19 can receive the second light beam 101b transmitted from the external object 1000 with different incident angles. Alternatively, the field angle range of the detection module 19 may be approximately a cone, and the actual size/area of the detection module 19 may be smaller than the size/area of the field area V1. In this way, the detection module 19 can have a small volume, occupy a small space below or inside the display module 12, and have a relatively low cost.

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 optical detection device 1 for detecting the fingerprint under the screen will be described below by taking the external object 1000 as a finger as an example. Since the fingerprint of the finger is composed of ridges and valleys, when the finger contacts the field of view region V1, the ridges of the fingerprint directly contact the field of view region V1, while the valleys of the fingerprint actually have a spacer with the field of view region V1, and normally, air is spaced between the valleys of the fingerprint and the field of view region V1. The valleys of the fingerprint may be considered as not being in direct contact with the first surface 111.

The first light beam 101a can be transmitted by total reflection within the protective layer 11. When a finger touches the field of view region V1, at least a part of the first light beam 101a transmitted by total reflection in the protective layer 11 is diffusely reflected at the fingerprint ridge contacting the field of view region V1, and the first light beam 101a is totally reflected at the position where the field of view region V1 faces the fingerprint valley. At least part of the first light beam 101a subjected to diffuse reflection can pass through the protective layer 11 and at least part of the display module 12 can be received by the detection module 19.

Specifically, when a finger is in contact with the field of view region V1, the ridges of the fingerprint are in direct contact with the field of view region V1, and the valleys of the fingerprint are spaced from the field of view region V1 by air. When the first light beam 101a is transmitted to the portion of the field of view region V1 opposite to the valleys of the fingerprint, the first light beam 101a continues to be totally reflected here because the portion of the field of view region V1 opposite to the valleys of the fingerprint is actually in contact with air. When the first light beam 101a is transmitted to a portion where the field of view region V1 is in direct contact with the ridge of the fingerprint, the first light beam 101a is diffusely reflected at the ridge of the fingerprint.

The conditions for the total reflection transmission of the first light beam 101a in the protective layer 11 are as follows: when the first surface 111 is in direct contact with a finger, a portion of the first light beam 101a may be transmitted by total reflection within the protective layer 11, and the first light beam 101a may be diffusely reflected where the ridge of the fingerprint and the first surface 111 are in direct contact.

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. Accordingly, the field of view region V1 may be circular with a diameter of 5 mm to 10 mm to collect enough detection beam 101 with fingerprint characteristics for fingerprint detection.

Alternatively, in some embodiments, as shown in fig. 1, the area where the first light beam 101a first reaches the first surface 111 after entering the protection layer 11 is the first predetermined area P1, that is, the first light beam 101a can directly irradiate the first predetermined area P1 after entering the protection layer 11. The first preset region P1 and the field-of-view region V1 have an overlapping region, and the area of the overlapping region of the first preset region P1 and the field-of-view region V1 is not less than 30% of the area of the field-of-view region V1. Further, the first preset region P1 may be located in the viewing field region V1, or the viewing field region P1 is located in the first preset region P1, or the first preset region P1 and the viewing field region V1 are partially overlapped, or there is no overlap between the first preset region P1 and the viewing field region V1. When there is no overlap between the first 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 first light beam 101a irradiated to the overlap region corresponds to a ridge capable of being directly irradiated to the fingerprint. The first light beam 101a irradiated to the non-overlapping area where the first 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. The second light beam 101b entering the protective layer 11 can exit from the second predetermined area P2 on the first surface 111. The second preset region P2 and the field of view region V1 do not overlap, or the area of the overlapping region of the second preset region P2 and the field of view region V1 is not more than 30% of the area of the field of view region V1. Further optionally, the center-to-center distance between the first preset area, the second preset area and the emission module 18 is smaller than the center-to-center distance between the field of view area V1 and the emission module 18.

At least part of the first light beam 101a subjected to diffuse reflection can pass through the second surface 112 of the protection layer 11 and at least part of the display module 12 to reach the detection module 19. The detection module 19 is capable of receiving at least a portion of the first light beam 101a after diffuse reflection and converting the received light beam into a corresponding electrical signal, such as, but not limited to, an electrical signal corresponding to ridge image information of a fingerprint. While the first light beam 101a incident at a position facing the valley of the fingerprint does not reach the external object 1000 to be diffused and transmitted by total reflection. Therefore, the first light beam 101a of diffuse reflection received by the detection module 19 corresponds to the ridge of the fingerprint only.

Simultaneously, at least part of the second light beam 101b can enter the inside of the finger after exiting from the first surface 111 and further be transmitted out of the finger. As shown in fig. 2A, the second light beam 101b exits from the portion of the first surface 111 located in the non-transparent region 110 and enters the finger (i.e. the external object 1000), and then is transmitted from the portion of the finger located above the field of view region V1, and can further transmit through the protective layer 11 and at least a portion of the display module 12 to be received by the detection module 19 and converted into corresponding electrical signals, such as, but not limited to, electrical signals corresponding to image information of ridges and valleys of a fingerprint.

Alternatively, in some embodiments, the emission module 18 can emit the first light beam 101a and the second light beam 101b simultaneously or non-simultaneously (time-sharing). Thus, the detection module 19 can receive at least part of the first light beam 101a and/or the second light beam 101b returned by the finger (or the external object 1000) and convert the received light beam into an electrical signal to acquire corresponding fingerprint image information.

Thus, the detection module 19 can be used to receive a detection beam 101 returning from an external object 1000, the detection beam 101 returning from the external object comprising: the first light beam 101a that is diffusely reflected on the external object 1000, and/or the second light beam 101b that is transmitted from the external object 1000. The detection module 19 is capable of receiving the first light beam 101a diffusely reflected on the external object 1000 and/or the second light beam 101b transmitted from the external object 1000.

The emitting module 18 can emit the first light beam 101a and the second light beam 101b at the same time, and the detecting module 19 can receive the first light beam 101a and the second light beam 101b returned by the external object 1000 at the same time, and use the received first light beam 101a and the received second light beam 101b to generate the biometric image of the external object 1000.

The first light beam 101a received by the detection module 19 is the first light beam 101a diffusely reflected on the ridge of the fingerprint, and the valley of the fingerprint is not diffusely reflected by the first light beam 101a, and the first light beam 101a corresponding to the valley of the fingerprint is not received by the detection module 19.

The second light beam 101b received by the detection module 19 is the second light beam 101b transmitted from the ridge and the valley of the fingerprint. Since the ridges of the fingerprint directly contact the first surface 111 and there is an air space between the valleys of the fingerprint and the first surface 111, the second light beam 101b transmitted from the ridges of the fingerprint can be directly refracted into the protective layer 11, and the second light beam 101b transmitted from the valleys of the fingerprint needs to be refracted into the protective layer 11 through the air. From the viewpoint of the energy of light, the energy when the second light beam 101b transmitted from the ridge of the fingerprint enters the protective layer 11 is larger than the energy when the second light beam 101b transmitted from the valley of the fingerprint enters the protective layer 11. Furthermore, the energy of the second light beam 101 corresponding to the ridge of the fingerprint in the second light beam 101b received by the detection module 19 is larger, and the energy of the second light beam 101b corresponding to the valley of the fingerprint is smaller.

Therefore, when detecting module 19 and receiving first light beam 101a and second light beam 101b simultaneously, the ridge of fingerprint corresponds first light beam 101a and the superpose of second light beam 101b, and the valley of fingerprint corresponds second light beam 101b, and the ridge and the valley of fingerprint have great light and shade contrast when optical imaging. An optical image of a fingerprint having a high contrast between light and dark can be obtained by simultaneously capturing the first light beam 101a and the second light beam 101 b.

Optionally, in some embodiments, the first light beam 101a accounts for 20%, 30%, 40%, 50%, 60%, 70%, 80% of the detection light beam 101, and correspondingly, the second light beam 101b accounts for 80%, 70%, 60%, 50%, 40%, 30%, 20% of the detection light beam 101. The proportion of the first light beam 101a and the second light beam 101b in the detection light beam 101 can be adjusted by adjusting the position and the light-emitting angle of the emitting module 18 and adjusting the included angle of the emitting module 18 relative to the second surface 112. For example, but not limited to, the emitting module 18 includes a plurality of light emitting units, each of the light emitting units has a light emitting surface for emitting the detection beam 101, and the light emitting surface and the second surface 112 are parallel or have an acute included angle.

Optionally, in some embodiments, 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 opposite to each other. 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 first light beam 101a returned by the external object 1000 has a better imaging effect on a dry finger, while the second light beam 101b returned by the external object 1000 has a better imaging effect on a wet finger or a finger with grease or dirt. The embodiment of the application can receive the first light beam 101a and the second light beam 101b returned by the external object 1000 at the same time to detect the biological characteristic information of the external object, so that better fingerprint optical images can be generated for fingers (dry fingers, wet fingers and the like) in different conditions, and better fingerprint detection efficiency and accuracy are achieved.

Alternatively, in some embodiments, the first surface 111 has a centerline along the length axis, and the center of the field of view region V1 may be located on or near the centerline.

Alternatively, in some embodiments, the optical detection device 1 can be used to detect biometric information of an external object, generate an image of an external object, detect a position of an external object, determine whether an external object is a living object, and the like.

Alternatively, in some embodiments, the emission module 18 can be configured to emit the first light beam 101a, the second light beam 101b, the first light beam 101a and the second light beam 101b at different periods of time, that is, the emission module 18 can emit the first light beam 101a and/or the second light beam 101b in a time-sharing manner. Therefore, the detection module 19 can receive the first light beam 101a and/or the second light beam 101b returned by the external object 1000 in a time-sharing manner, and use the received first light beam 101a and/or the received second light beam 101b to generate different characteristic images.

Alternatively, in some embodiments, the emitting module 18 can be configured to emit the detection beams 101 with different composition ratios and/or optical power magnitudes at the same time, where the composition ratio can be understood as a ratio that a portion (i.e., the first beam 101a) of the detection beam 101 capable of being transmitted by total reflection after entering the protective layer 11 and a portion (i.e., the second beam 101b) of the detection beam 101 capable of exiting from the first surface 111 correspond to all the detection beams 101, but the composition ratio should not be limited to the above understanding.

For example, but not limited to, the ratio of the optical power of the first light beam 101a in the detection light beams 101 emitted by the emission module 18 in the time period t1 to the optical power of all the detection light beams 101 is greater than or equal to a first preset ratio; the proportion of the optical power of the second light beam 101b in the detection light beams 101 emitted by the emission module 18 in the time period t2 to the optical power of all the detection light beams 101 is greater than or equal to a second preset proportion. Further, the emission module 18 may emit the detection light beam 101 during the time period t3, and the total optical power of the detection light beam 101 emitted by the emission module 18 during the time period t3 is substantially equal to the sum of the total optical power of the detection light beam 101 of the emission module 18 during the time period t1 and the time period t 2. In other words, the detection light beams 101 emitted by the emission module 18 at the time t3 include the detection light beams 101 emitted by the emission module at the time t1 and t 2. It is understood that, during the period t3, the ratio of the optical power of the first light beam 101a of the detection light beams 101 emitted by the emission module 18 to the optical power of all the detection light beams 101 is smaller than or equal to the first preset ratio, and the ratio of the optical power of the second light beam 101b of the detection light beams 101 emitted by the emission module 18 to the optical power of all the detection light beams 101 is smaller than or equal to the second preset ratio. The first predetermined ratio may be any value between 50%, 60%, 70%, 80%, 90%, 100%, or 60% and 100%, and the second predetermined ratio may be any value between 50%, 60%, 70%, 80%, 90%, 100%, or 60% and 100%. The time periods t1, t2 and t3 are only schematic descriptions, and the time lengths of the time periods t1, t2 and t3 may be the same or different, and may be continuous or intermittent, which is not limited in the embodiments of the present application. The transmitting module 18 may operate at different time intervals in a time-sharing manner, and the different time intervals may include all or part of the time intervals t1, t2 and t3, or may not include any part of the time intervals t1, t2 and t 3.

Alternatively, in some embodiments, the emission module 18 may include a plurality of identical or different light emitting units capable of emitting the detection light beam 101. The detection light beams 101 emitted by the light emitting units may have different composition ratios after entering the protective layer 11, for example, but not limited to, the light emitting units at least include a first light emitting unit and a second light emitting unit, a proportion of the first light beams 101a in the detection light beams 101 emitted by the first light emitting unit may be greater than or equal to the first preset ratio, and a proportion of the second light beams 101b in the detection light beams 101 emitted by the second light emitting unit may be greater than or equal to the second preset ratio.

By controlling the different light emitting units to be turned on at different time intervals, the emission module 18 can be controlled to emit the detection light beams 101 with different composition ratios in a time-sharing manner. Thus, the optical detection device 1 can receive the detection light beam 101 with different composition ratios at different time intervals through the detection module 19 and convert the detection light beam into an electric signal, so as to obtain different biological characteristic information of the external object 1000. The different biometric information may correspond to different biometric image information of the external object 1000, such as, but not limited to, image information mainly derived from the first light beam 101a subjected to diffuse reflection, image information mainly derived from the second light beam 101b transmitted from the external object 1000, and image information mainly derived from the first light beam 101a subjected to diffuse reflection combined with the second light beam 101b transmitted from the external object 1000. It will be appreciated that different imaging sources may be suitable for different application scenarios. When one of the image information having the first light beam 101a subjected to diffuse reflection or the second light beam 101b transmitted from the external object 1000 as a main imaging source can satisfy the optical imaging requirement for biometric feature detection and identification, it may not be necessary to perform the acquisition of the light beams of other imaging sources. If a single one of the image information of the main imaging source, which is the first light beam 101a subjected to diffuse reflection, or the image information of the main imaging source, which is the second light beam 101b transmitted from the external object 1000, cannot satisfy the optical imaging requirement for biometric feature detection and identification, the light beams of different imaging sources may be combined to generate combined image information of the imaging sources, or the different image information may be combined to obtain image information of the combined image information. For example, when the external environment interference is large, the detection module 19 may collect the first light beam 101a subjected to diffuse reflection and the second light beam 101b transmitted from the external object 1000 in a time-sharing manner and combine the image information corresponding to the first light beam and the second light beam to perform biometric detection; alternatively, the detection module 19 may simultaneously collect the first light beam 101a subjected to diffuse reflection and the second light beam 101b transmitted from the external object 1000 and acquire corresponding image information to perform biometric detection. The optical detection device 1 has better biological feature detection efficiency and detection quality, and can be suitable for different environments.

Alternatively, in some embodiments, for example and without limitation, during the first period of time, the emitting module 18 emits the first light beam 101a, and the detecting module 19 receives the first light beam 101a returned by the external object 1000 and generates a corresponding first characteristic image. During a second time interval, the emission module 18 emits a second light beam 101b, and the detection module 19 receives the second light beam 101b returned by the external object 1000 and is used for generating a corresponding second characteristic image. The first characteristic image or the second characteristic image is respectively and independently used for the biological characteristic recognition of the external object 1000; or, the first characteristic image and the second characteristic image can be synthesized into a biometric image, and the biometric image is used for biometric detection and identification of the external object 1000.

Also for example, but not limiting of, during the first period of time, the emission module 18 emits the second light beam 101b, and the detection module 19 receives the second light beam 101b returned by the external object 1000 and is used for generating a corresponding second characteristic image. In the second time interval, the emitting module 18 emits the first light beam 101a, and the detecting module 19 receives the first light beam 101a returned by the external object 1000 and is used for generating a corresponding first characteristic image. The first characteristic image or the second characteristic image is respectively and independently used for the biological characteristic recognition of the external object 1000; or, the first characteristic image and the second characteristic image can be synthesized into a biometric image, and the biometric image is used for biometric detection and identification of the external object 1000.

Also for example, but not limiting of, during the first period of time, the emitting module 18 emits the first light beam 101a, and the detecting module 19 receives the first light beam 101a returned by the external object 1000, and is used for generating the corresponding first characteristic image. In a second time interval, the emission module 18 emits the first light beam 101a and the second light beam 101b, and the detection module 19 receives the second light beam 101b and the first light beam 101a returned by the external object 1000 and is used for generating a corresponding third characteristic image. The first characteristic image and the third characteristic image are respectively and independently used for biological characteristic identification of the external object 1000; or, the first feature image and the third feature image can be synthesized into a biometric image, and the biometric image is used for performing biometric detection and identification on the external object 1000.

Also for example, but not limiting of, during the first period of time, the emitting module 18 emits the first light beam 101a and the second light beam 101b, and the detecting module 19 receives the second light beam 101b and the first light beam 101a returned by the external object 1000 and is used for generating the corresponding third characteristic image. In a second time interval, the emitting module 18 emits the first light beam 101a, the detecting module 19 receives the first light beam 101a returned by the external object 1000 and is used for generating a corresponding first characteristic image, and the third characteristic image and the first characteristic image are respectively and independently used for the biological characteristic identification of the external object 1000; or, the third characteristic image and the first characteristic image can be synthesized into a biometric image, and the biometric image is used for biometric detection and identification of the external object 1000.

Also for example, but not limiting of, during the first period of time, the emission module 18 emits the second light beam 101b, and the detection module 19 receives the second light beam 101b returned by the external object 1000 and is used for generating a corresponding second characteristic image. During a second time interval, the emission module 18 emits the first light beam 101a, and the detection module 19 receives the second light beam 101a returned by the external object 1000 and is used for generating a corresponding first characteristic image. In a third time interval, the emitting module 18 emits the first light beam 101a and the second light beam 101b, and the detecting module 19 receives the first light beam 101a and the second light beam 101b returned by the external object 1000 and is used for generating a corresponding third characteristic image. The first characteristic image, the second characteristic image and the third characteristic image are respectively and independently used for biological characteristic identification of the external object 1000; or at least two of the first feature image, the second feature image and the third feature image can be synthesized into a biometric image, and the biometric image is used for biometric detection and identification of the external object 1000.

Also for example, but not limiting of, during the first period of time, the emitting module 18 emits the first light beam 101a, and the detecting module 19 receives the first light beam 101a returned by the external object 1000, and is used for generating the corresponding first characteristic image. During a second time interval, the emission module 18 emits a second light beam 101b, and the detection module 19 receives the second light beam 101b returned by the external object 1000 and is used for generating a corresponding second characteristic image. In a third time interval, the emitting module 18 emits the first light beam 101a and the second light beam 101b, and the detecting module 19 receives the first light beam 101a and the second light beam 101b returned by the external object 1000 and is used for generating a corresponding third characteristic image. The first characteristic image, the second characteristic image and the third characteristic image are respectively and independently used for biological characteristic identification of the external object 1000; or at least two of the first feature image, the second feature image and the third feature image can be synthesized into a biometric image, and the biometric image is used for biometric detection and identification of the external object 1000.

Of course, the transmitting module 18 may also have different time-sharing operation modes in different embodiments, and the application is not limited thereto. It should be noted that the first time period, the second time period, the third time period and the like correspond to different time periods of single fingerprint detection or multiple fingerprint detections, and the first time period, the second time period and the third time period are only used for illustrating different time periods during detection, and should not be construed as limitations in the embodiments of the present application. The time lengths of the first, second, and third periods may be the same or different, and may be interrupted, discarded, or re-detected due to other factors during the detection process, which may be unnecessary or may be partial. For example, but not limited to, the transmitting module 18 may be controlled to implement different transmitting modes in a fourth time period, a fifth time period, and other further different time periods. For example, but not limited to, the first time interval, the second time interval and the third time interval are not overlapped and have sequential chronological order.

Referring to fig. 3A and fig. 3B, an optical detection device 1a is shown as a modified embodiment of the optical detection device 1, and fig. 3B may be a partial cross-sectional view along a line B-B of fig. 3A. The emission module 18 includes a plurality of light emitting units 181. The plurality of light emitting cells 181 are aligned in a row in a direction parallel to the width axis (X axis) of the protective layer 11. As shown in fig. 3, the emission module 18 includes 2 groups of light emitting units, and each group of light emitting units 181 includes 2 light emitting units 181. The first surface 111 has a reference axis 130 parallel to the length axis (Y-axis). The orthographic projection of the 2 groups of light emitting units or 4 light emitting units 181 on the first surface 111 is symmetrical about the reference axis 130.

Optionally, in some embodiments, the protective layer 11 has a top and a bottom opposite to each other along a length axis (Y axis), and the light emitting unit 181 is located below the top and/or the bottom of the protective layer 11.

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 or a top light emitting type light emitting element.

Optionally, in some embodiments, the emission module 18 may further include a circuit board, such as but not limited to a flexible circuit board, which is electrically connected to the light emitting unit 181, and the circuit board may be fixedly connected or detachably connected through glue, double-sided tape, adhesive, bolts, brackets, snaps, slots, welding, and a fixing frame.

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, 5, 6, or more. The plurality of light emitting units 181 may be located under the non-transparent region 110 of the protective layer 11 at equal intervals or at unequal intervals.

Note that in the present specification and the drawings of the specification, the "X axis" in the three-axis orthogonal coordinate system may correspond to the width axis direction of the protective layer 11 and the first surface 111, the "Y axis" may correspond to the length axis direction of the protective layer 11 and the first surface 111, and the "Z axis" may correspond to the thickness axis direction of the protective layer 11.

Optionally, in some embodiments, the display device 10 further includes a fixing frame (not shown), which can be used to receive and carry the display module 12. The fixing frame can be connected with the protective layer 11, and the transmitting module 18 is fixedly connected or detachably connected on the fixing frame. Further, the fixed frame comprises a bottom part positioned below the display module 12 and a side part connected with the protective layer 11, and the transmitting module 18 is fixedly connected with the side part and/or the bottom part of the fixed frame. When the emission module 18 is fixed at the side of the fixing frame, the light emitting surface of the emission module 18 for emitting the detection beam 101 can be closer to the second surface 112 of the protection layer 11, so that the emission angle range of the emission module 18 is not blocked.

The fixing frame may be any structure for supporting the protective layer 11 and/or the display module 12.

Optionally, in some embodiments, the emission module 18 includes 1 or more groups of light emitting units, and each group of light emitting units includes 1 or more light emitting units 181. For example, but not limited to, the emission module 18 includes 1, 2, 3, 4, 5 or more light emitting units, and each light emitting unit includes 1, 2, 3 or more light emitting units 181. The orthographic projections of the groups of light-emitting units on the first surface 111 are symmetrically distributed about the reference axis 130.

Optionally, the light emitting unit 181 is closely attached to the second surface 112. The light emitting unit 181 is capable of emitting the first light beam 101a and the second light beam 101b simultaneously. The proportions of the first light beam 101a and the second light beam 101b emitted by different light emitting units 181 may be different.

Fig. 4 is a partial schematic view of an alternative embodiment of the optical detection apparatus 1 shown in fig. 2A. The structure of the optical detection device 1b is substantially the same as that of the optical detection device 1, and further, the display device 10 of the optical detection device 1b includes a light converter 13 between the protective layer 11 and the emission module 18. The light converter 13 is attached to the portion of the second surface 112 located in the non-transparent region 110.

The optical converter 13 can deflect a part of the detection beam 101 emitted by the emitting module 18 and then transmit the part of the detection beam, namely the first beam 101a, through total reflection in the protective layer 11. Another part of the detection light beam 101 is able to exit the first surface 111 through the light converter 13 and the protective layer 11, and this part of the detection light beam 101 is the second light beam 101 b. Optionally, in some embodiments, the emission module 18 and the light converter 13 have a distance, and the distance may be 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm.

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 below the transparent substrate opposite to the non-display area 110, can be used to transmit the detection light beam 101 and intercept visible light. The light converter 13 may be formed on the lower surface of the optical film layer, or the light converter 13 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.

Optionally, the first surface 111 comprises a reference axis parallel to the length axis, the light converter 13 being located on or near the reference axis. The light converter 13 has a rectangular shape. Or, the light converter 13 has any other shape that meets the product requirement, such as but not limited to a circle, an ellipse, a rectangle with rounded corners, etc., and the light converter 13 may have different sizes according to the product requirement, which is not limited by the present invention.

In this embodiment or other modifications, the optical converter 13 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 13 may be omitted or integrated in the protective layer 11. Optionally, in some embodiments, the light converter 13 is disposed between the light emitting surface of the emission module 18 and the second surface 112 of the protection layer 11 and attached to the second surface 112, or the light converter 13 and the protection layer 11 are integrally formed.

As shown in fig. 4, when the external object 1000 is a finger, the first light beam 101a can be directly irradiated to the field of view region V1 and diffusely reflected at the ridge of the fingerprint.

The second light beam 101b can enter the finger after exiting from the portion of the first surface 111 located in the non-transparent area 110, and is transmitted out at the ridges and valleys of the fingerprint where the finger faces the field of view area V1, and can be refracted into the protective layer 11 and then further received by the detection module 19 through the protective layer 11 and at least part of the display module 12. Alternatively, in some embodiments, the second light beam 101b may enter the finger after exiting from the portion of the first surface 111 located in the transparent region 120 and/or the portion of the first surface 111 located in the non-transparent region 110.

Fig. 5 is a schematic structural diagram of an alternative embodiment of the optical converter 13 in fig. 4. The light converter 13 includes a first conversion portion 131 and a second conversion portion 132. The emission module 18 emits the detection beam 101, and the first conversion portion 131 is used for deflecting the transmitted detection beam 101 to be called a first beam 101a, i.e. the first conversion portion 131 is used for generating the first beam 101 a. The second converting part 132 is for enabling the transmitted detection light beam 101 to exit from the first surface 111 of the protective layer 11, i.e., the second converting part 132 is for generating the second light beam 101 b. For example, but not limited to, the first converting part 131 is an optical multilayer film having an optical path deflecting property, and the second converting part 132 is made of transparent glass or other materials capable of transmitting the detection beam 101. The first conversion portion 131 deflects the detection light beam 101 to the direction of the field of view region V1. The incident angle of the first light beam 101a deflected by the first conversion part 131 reaching the first surface 111 is θ, and θ is not less than the critical angle of total reflection at the interface between the protective layer 11 and the air (i.e., the first surface 111). Assuming that the refractive index of the protective layer 11 is 1.5 and the refractive index of air is 1.0, θ is not less than 42 degrees.

Fig. 6 is a schematic structural diagram of an alternative embodiment of the optical converter 13 in fig. 4. The light converter 13 includes a first conversion portion 131 and a second conversion portion 132. The emission module 18 emits the detection beam 101, and the first conversion portion 131 is used for deflecting the transmitted detection beam 101 to be called a first beam 101a, i.e. the first conversion portion 131 is used for generating the first beam 101 a. The second converting part 132 is for enabling the transmitted detection light beam 101 to exit from the first surface 111 of the protective layer 11, i.e., the second converting part 132 is for generating the second light beam 101 b. For example, but not limited to, the side of the first converting part 131 facing the emission module 18 has a plurality of protruding microstructures with triangular cross-section, and the side of the second converting part 132 facing the emission module 18 is a plane. The incident angle of the first light beam 101a deflected by the first conversion part 131 reaching the first surface 111 is θ, and θ is not less than the critical angle of total reflection at the interface between the protective layer 11 and the air (i.e., the first surface 111).

Fig. 7 is a schematic structural diagram of an alternative embodiment of the optical converter 13 in fig. 4. The light converter 13 includes a first conversion portion 131 and a second conversion portion 132. The emission module 18 emits the detection beam 101, and the first conversion portion 131 is used for deflecting the transmitted detection beam 101 to be called a first beam 101a, i.e. the first conversion portion 131 is used for generating the first beam 101 a. The second converting part 132 is configured to enable at least a portion of the transmitted detection light beam 101 to exit from the first surface 111 of the protective layer 11, i.e., the second converting part 132 is configured to generate the second light beam 101 b. For example, but not limited to, a side of the first converting part 131 facing the launching module 18 has a convex structure with a triangular cross section, a side of the second converting part 132 facing the launching module 18 has a convex structure with a triangular cross section, and the convex structures of the first converting part 131 and the second converting part 132 have different included angles with respect to the second surface 112. The degree of deflection of the detection beam 101 by the second conversion portion 132 is smaller than the degree of deflection of the detection beam by the first conversion portion 131, so that the detection beam 101 transmitted through the second conversion portion 132 can exit from the first surface 111. The incident angle of the first light beam 101a deflected by the first conversion part 131 reaching the first surface 111 is θ, and θ is not less than the critical angle of total reflection at the interface between the protective layer 11 and the air (i.e., the first surface 111).

Fig. 8 is a schematic structural diagram of an alternative embodiment of the optical converter 13 in fig. 4. The emission module 18 emits the detection beam 101, the optical converter 13 converts a part of the detection beam 101 into a first beam 101a, an incident angle of the first beam 101a reaching the first surface 111 is θ, and θ is not smaller than a critical angle of total reflection of an interface (i.e., the first surface 111) between the protective layer 11 and air. A part of the detection beam 101 directly enters the protective layer 11 from the second surface 112 of the protective layer 11 and exits from the first surface 111, and this part of the detection beam 101 is the second beam 101 b. For example, but not limited to, the side of the light converter 13 facing the emission module 18 has a saw-tooth structure.

Fig. 9A and 9B are partial schematic views of an alternative embodiment of the optical detection device 1, and fig. 9B is a partial sectional view of the optical detection device 1C along the line C-C in fig. 9A, wherein the section along the line C-C is perpendicular to the length axis (Y axis) of the protection layer 11. The optical detection device 1c and the optical detection device 1 are substantially identical in structure. In the optical detection device 1c, the emitting module 18 includes a first light emitting unit 181a and a second light emitting unit 181b, and the first light emitting unit 181a and the second light emitting unit 181b are disposed at an interval or in the vicinity.

The second light emitting unit 181b and the second surface 112 of the protective layer 11 have an air gap therebetween, and the first light emitting unit 181a and the second surface 112 of the protective layer 11 are attached to each other. As is known from the optical principle, the detection light beam 101 emitted by the second light emitting unit 181b enters the protective layer 11 from the second surface 112 through air, and can exit from the first surface 111. Thus, the second light emitting unit 181b can provide the second light beam 101 b. For example, but not limiting of, in some embodiments, the first light emitting unit 181a and the second surface 112 are attached together, or there is no air between the first light emitting unit 181a and the second surface 112. The second light emitting unit 181b is spaced apart from the second surface 112 by air, or the second light emitting unit 181b is attached to the second surface 112. The first surface 111 of the protective layer 11 has a reference axis 130 parallel to the length axis, and orthogonal projections of the first light emitting unit 181a and the second light emitting unit 181b on the first surface 111 may be axisymmetrically distributed about the reference axis 130. The reference axis 130 may be a central axis of the first surface 111, or may be another axis parallel to the longitudinal axis. This is not a limitation of the present application.

Alternatively, in some embodiments, the number of the first light emitting unit 181a and the second light emitting unit 181b may be one or more, and orthogonal projections of the first light emitting unit 181a and the second light emitting unit 181b on the first surface 111 are distributed in an axisymmetric manner with respect to the reference axis 130.

The detection light beam 101 emitted by the first light emitting unit 181a directly enters the protective layer 11 from the second surface 112 without passing through air, and the incident angle of at least a part of the detection light beam 101 emitted by the first light emitting unit 181a on the first surface 111 is not smaller than the critical angle of total reflection of the protective layer 11, and this part of the detection light beam 101 emitted by the first light emitting unit 181a can be transmitted by total reflection in the protective layer 11, and this part of the detection light beam 101 is the first light beam 101 a. Thus, the first light emitting unit 181a can provide the first light beam 101 a.

Alternatively, in some embodiments, the maximum value of the incident angle of the detection light beam 101 emitted by the first light emitting unit 181a reaching the first surface 111 after entering the protective layer 11 is greater than the maximum value of the incident angle of the detection light beam 101 emitted by the second light emitting unit 181b reaching the first surface 111 after entering the protective layer 11.

Alternatively, in some embodiments, the maximum value of the incident angle of the detection light beam 101 emitted by the first light emitting unit 181a entering the protective layer 11 is greater than the maximum value of the incident angle of the detection light beam 101 emitted by the second light emitting unit 181b entering the protective layer 11.

Alternatively, in some embodiments, the maximum value of the incident angle of the detection light beam 101 emitted by the first light emitting unit 181a reaching the first surface 111 after entering the protective layer 11 is greater than or equal to the critical angle of total reflection when the first surface 111 contacts air.

Alternatively, in some embodiments, the minimum value of the incident angle of the detection light beam 101 emitted by the first light emitting unit 181a after entering the protective layer 11 and reaching the first surface 111 is greater than or equal to the critical angle of total reflection when the first surface 111 contacts air.

Optionally, in some embodiments, the proportion of the detection beam 101 transmitted by total reflection in the protective layer 111 after the detection beam 101 emitted by the first light-emitting unit 181a enters the protective layer 11 is greater than or equal to 60%, 70%, 80%, 90% of the total detection beam 101.

Optionally, in some embodiments, the proportion of the detection light beam 101 emitted by the second light emitting unit 181b after entering the protective layer 11 and exiting from the first surface 111 is greater than or equal to 60%, 70%, 80%, and 90% of the total detection light beam 101.

The first and second

light emitting units

181a and 181b can emit light simultaneously or in a time-division manner. The emission module 18 has different operation modes according to different operation states of the first light emitting unit 181a and the second light emitting unit 181 b. The method specifically comprises the following steps:

the first light emitting unit 181a is operated, the second light emitting unit 181b is not operated, the first light emitting unit 181a provides the first light beam 101a, that is, the emitting module 18 provides the first light beam 101a, and the detecting module 19 can receive the first light beam 101a returned by the external object 1000. Defining that the transmit module 18 is in the first transmit mode at this time.

The first light emitting unit 181a does not work, the second light emitting unit 181b works, the second light emitting unit 181b provides the second light beam 101b, that is, the emitting module 18 provides the second light beam 101b, and the detecting module 19 can receive the second light beam 101b returned by the external object 1000. Defining the transmit module 18 to be in a second transmit mode at this time.

The first light emitting unit 181a operates and the second light emitting unit 181b operates simultaneously, the first light emitting unit 181a provides the first light beam 101a, and the second light emitting unit 181b provides the second light beam 101b, that is, the emitting module 18 provides the first light beam 101a and the second light beam 101b simultaneously. The detection module 19 is capable of receiving the first light beam 101a and the second light beam 101b returned by the external object 1000. Defining that the transmit module 18 is in a third transmit mode at this time.

The transmission module 18 can operate in at least two different modes of the first transmission mode, the second transmission mode and the third transmission mode in a time-division manner. The emission module 18 is thus able to provide the first light beam 101a, the second light beam 101b, the first light beam 101a and the second light beam 101b in time division. The detection module 19 is capable of receiving the first light beam 101a, the second light beam 101b, the first light beam 101a and the second light beam 101b in a time-sharing manner through the protective layer 11 and at least a portion of the display module 12.

It can be understood that the first light beam 101a received by the detection module 19 is the first light beam 101a that is diffusely reflected on the ridge of the fingerprint (when the external object 1000 is a finger). The second light beam 101b received by the detection module 19 is the second light beam 101b transmitted by the ridges and valleys of the finger.

Optionally, in some embodiments, the first light beam 101a provided by the emission module 18 in the first emission mode can generate a corresponding first characteristic image after being collected by the detection module 19. The second light beam 101b provided by the emission module 1 in the second emission mode can generate a corresponding second characteristic image after being collected by the detection module 19. The first light beam 101a and the second light beam 101b provided by the emission module 1 in the third emission mode can generate corresponding third characteristic images after being collected by the detection module 19. The optical detection device 1c can perform fingerprint detection and identification according to the first characteristic image, the second characteristic image and the third characteristic image. Alternatively, the optical detection device 1c may combine at least two of the first characteristic image, the second characteristic image, and the third characteristic image into a biometric image, and perform fingerprint detection and identification based on the combined biometric image.

By controlling the emitting module 18 to operate in different modes in time division, the detecting module 19 can acquire the first light beam 101a returned by the external object 1000 through diffuse reflection and the second light beam 101b returned by the external object 1000 through transmission in time division or receive the first light beam 101a and the second light beam 101b returned by the external object 1000 at the same time. For example, but not limiting of, the transmitting module 18 operates in a first transmitting mode during a first period of time and operates in a second transmitting mode during a second period of time; alternatively, the transmitting module 18 operates in the first transmitting mode during the first period and operates in the third transmitting mode during the second period; alternatively, the transmitting module 18 operates in the second transmitting mode during the first period and operates in the third transmitting mode during the second period; alternatively, the transmitting module 18 operates in the second transmitting mode during the first period and operates in the first transmitting mode during the second period; alternatively, the transmitting module 18 operates in the first transmitting mode during a first period, operates in the second transmitting mode during a second period, and operates in the third transmitting mode during a third period. Those skilled in the art can modify the design according to the needs, and the embodiments of the present application are not limited thereto. The above-mentioned control of the time-sharing and/or simultaneous operation of the transmit modules 18 may be implemented by a control unit or circuit.

In addition, in some embodiments, the detection light beams emitted by the first light emitting unit 181a and the second light emitting unit 181b may include both the first light beam 101a and the second light beam 101 b. That is, a part of the detection light beams 101 emitted by the first light emitting unit 181a and the second light emitting unit 181b enter the protective layer 11 to satisfy a condition of total reflection transmission, and a part can exit from the first surface 111 of the protective layer 11.

Optionally, in some embodiments, the detection beam 101 emitted by the emission module 18 in the first emission mode includes a portion transmitted by total reflection in the protective layer 11 and/or a portion emitted above the first surface 111.

Optionally, in some embodiments, the detection beam 101 emitted by the emission module 18 in the second emission mode includes a portion transmitted by total reflection in the protective layer 11 and/or a portion emitted above the first surface 111.

Optionally, in some embodiments, in the detection light beam 101 emitted by the first light emitting unit 181a, reaching the external object 1000 and returning, the proportion of the first light beam 101a is greater than that of the second light beam 101b, or the optical power of the first light beam 101a is greater than that of the second light beam 101 b. Similarly, in the detection light beam 101 emitted by the second light emitting unit 181b, reaching the external object 1000 and returning, the proportion of the first light beam 101a is smaller than that of the second light beam 101b, or the optical power of the first light beam 101a is smaller than that of the second light beam 101 b. Then, in these embodiments, when the emitting module 18 is in the first mode, the first light emitting unit 181a is operated, the second light emitting unit 181b is not operated, the detection light beam 101 returned by the external object 1000 received by the detecting module 19 may include the first light beam 101a and the second light beam 101b, and the proportion of the first light beam 101a is greater than that of the second light beam 101 b; when the emitting module 18 is in the second mode, the first light emitting unit 181a does not operate, the second light emitting unit 181b operates, the detection light beam 101 returned by the external object 1000 received by the detecting module 19 may include a first light beam 101a and a second light beam 101b, and a proportion of the first light beam 101a is smaller than a proportion of the second light beam 101 b. When the emitting module 18 is in the third mode, the detection beam 101 returned by the external object 1000 received by the detecting module 19 may include a first beam 101a and a second beam 101b, and the proportion of the first beam 101a is greater than, equal to, or less than the proportion of the second beam 101 b.

Further, in some embodiments, when the second light emitting unit 181b is operated and the first light emitting unit 181a is not operated, not less than 70%, 80%, 90% of the detection light beam 101 returned by the external object 1000 is the second light beam 101 b. Or, when the emitting module 18 is in the second emitting mode, not less than 70%, 80%, and 90% of the detection light beams 101 returned by the external object 1000 are the second light beams 101 b.

Further, in some embodiments, when the first light emitting unit 181a is operated and the second light emitting unit 181b is not operated, not less than 70%, 80%, and 90% of the detection light beams 101 returned by the external object 1000 are the second light beams 101 b. Alternatively, when the emitting module 18 is in the first emitting mode, not less than 70%, 80%, and 90% of the detection light beams 101 returned by the external object 1000 are the second light beams 101 a.

Further, in some embodiments, when the first light emitting unit 181a is operated and the second light emitting unit 181b is also operated, the ratio of the detection light beam 101 returned by the external object 1000, which is not less than the first light beam 101a and the second light beam 101b, is less than 90%, 80% or 70%.

In the above alternative embodiment, the ratio of the first light beam 101a to the second light beam 101b in the detection light beam 01 can be regarded as the ratio of the optical power of the first light beam 101a to the optical power of the second light beam 101b to the total optical power of the detection light beam 101.

Optionally, in some embodiments, when the emission module 18 is in the first emission mode, a portion of the detection light beam 101 emitted by the first light emitting unit 181a, which is not less than a first preset proportion, can be transmitted by total reflection in the protective layer 11. When the emitting module 18 is in the second emitting mode, a part of the detection light beam 101 emitted by the second light emitting unit 181b, which is not less than a second preset proportion, can be emitted from the first surface to above the protective layer and reach the external object 1000 located above the protective layer 11. The first predetermined ratio may be, but is not limited to, any value between 60%, 70%, 80%, 90%, 100%, or 60% to 100%, and the second predetermined ratio may be, but is not limited to, any value between 60%, 70%, 80%, 90%, 100%, or 60% to 100%.

Further optionally, when the emission module 18 is in the third emission mode, a ratio of optical power of a part of the detection beam 101, which can be transmitted by total reflection in the protective layer 11, in the detection beam 101 to optical power of all the detection beam 101 is smaller than a first preset ratio, and a ratio of optical power of a part of the detection beam 101, which is transmitted, in the detection beam 101 to optical power of all the detection beam 101 is smaller than a second preset ratio. The first predetermined ratio is for example but not limited to 60%, 70%, 80%, 90%, and the second predetermined ratio is for example but not limited to 60%, 70%, 80%, 90%.

Alternatively, in some embodiments, an area where the detection light beam 101 emitted by the first light emitting unit 181a reaches the first surface 111 for the first time is defined as a third preset area, an area where the detection light beam 101 emitted by the second light emitting unit 181b reaches the first surface 111 for the first time is defined as a fourth preset area, and a first overlapping area exists between the third preset area and the field of view area, and the area of the first overlapping area is not less than 30% of the area of the field of view area V1. There is no overlapping area between the fourth preset region and the field of view region V1, or there is a second overlapping area between the fourth preset region and the field of view region V1, the area of the second overlapping area is not more than 30% of the area of the field of view region. The third predetermined area is at least partially located in the non-transparent area 110, the fourth predetermined area is at least partially located in the transparent area 120, and the field of view area V1 is at least partially located in the transparent area 120.

Fig. 10 is a schematic block diagram of the optical detection apparatus 1 c. The optical detection device 1c further comprises a control unit 15 connected to the emission module 18. The control unit 15 is configured to control the first light-emitting unit 181a and the second light-emitting unit 181b to emit light in a time-sharing and/or simultaneous manner. The proportion of the first light beam 101a in the detection light beams 101 emitted by the first light emitting unit 181a is greater than or equal to a first preset proportion, and the proportion of the second light beam 101b in the detection light beams 101 emitted by the second light emitting unit 181b is greater than or equal to a second preset proportion. For example, but not limited to, in a first period, the control unit 15 controls the first light emitting unit 181a to be operated and the second light emitting unit 181b to be not operated; in the second period, the control unit 15 controls the second light emitting unit 181b to be operated and the first light emitting unit 181a to be not operated.

The control unit 15 may include a control circuit and a driving circuit, and the control unit 15 may be electrically connected to the first and second

light emitting units

181a and 181b, respectively.

Referring to fig. 11A and 11B, an optical inspection apparatus 1d is shown as a modified embodiment of the optical inspection apparatus 1, in which the protection layer 11 of the optical inspection apparatus 1d has a width axis (X axis) and a length axis (Y axis). FIG. 11B is a schematic partial cross-sectional view of the optical detection device 1D of FIG. 11A taken along line D-D, the cross-section taken along line D-D being perpendicular to the length axis (Y-axis) of the protective layer 11. The optical detection device 1d and the optical detection device 1c are substantially identical in structure. In the optical detection device 1d, the number of the second light emitting units 181b is 2, the 2 second light emitting units 181b are respectively located on both sides of the first light emitting unit 181a, and the first light emitting unit 181a and the 2 second light emitting units 181b are arranged in a line in the width axis (X axis) direction. Optionally, the first light emitting unit 181a is attached to the second surface 112 of the protective layer 11, or a light converter 13 is disposed between the first light emitting unit 181a and the second surface 112 of the protective layer 11. Alternatively, air is provided between the 2 second light emitting units 181b and the second surface 112 of the protective layer 11, or a light converter 13 is provided between the 2 second light emitting units 181b and the second surface 112 of the protective layer 11.

Optionally, the first surface 111 has a reference axis 130 parallel to the length axis (Y axis), and the orthogonal projection of the second light emitting unit 181b on the first surface 111 is distributed in an axisymmetric manner with respect to the reference axis 130.

Optionally, the first surface 111 has a reference axis 130 parallel to the length axis (Y axis), and orthogonal projections of the first light emitting unit 181a and the second light emitting unit 181b on the first surface 111 are distributed in an axisymmetric manner with respect to the reference axis 130.

Alternatively, the first surface 111 has a reference axis 130 parallel to the length axis (Y-axis), and an orthogonal projection of the second light emitting unit 181b on the first surface 111 is axisymmetric with respect to the reference axis 130, or an orthogonal projection of the first light emitting unit 181a on the first surface 111 intersects the reference axis 130.

Referring to fig. 12A and 12B, an optical inspection device 1E is shown as a modified embodiment of the optical inspection device 1, and fig. 12B is a schematic partial cross-sectional view of the optical inspection device 1E along the line E-E in fig. 12A, wherein the cross-section along the line E-E is perpendicular to the length axis (Y axis) of the protection layer 11. The optical inspection device 1e and the optical inspection device 1d have substantially the same structure, except that the emission module 18 of the optical inspection device 1e includes 2 first

light emitting units

181a and 1 second light emitting unit 181b, the second light emitting unit 181b is located below the bottom center of the protective layer 11, the 2 first light emitting units 181a are located at both sides of the second light emitting unit 181b, and the 2 first light emitting units 181a and the 1 second light emitting unit 181b are arranged in a row in the width axis direction below the non-transparent region 110 of the protective layer 11. Optionally, the 2 first light emitting units 181a are attached to the second surface 112 of the protective layer 11, or a light converter 13 is disposed between the 2 first light emitting units 181a and the second surface 112 of the protective layer 11. Alternatively, air is provided between the second light emitting unit 181b and the second surface 112 of the protection layer 11, or a light converter 13 is provided between the second light emitting unit 181b and the second surface 112 of the protection layer 11. Optionally, orthographic projections of the first light emitting unit 181a and/or the second light emitting unit 181b on the first surface 111 are distributed in an axisymmetric manner with respect to a reference axis 130 of the first surface 111 parallel to the length axis.

Of course, in other or modified embodiments, the number of the first light emitting unit 181a and the second light emitting unit 181b may be one or more, and the embodiment of the present application does not limit this. When the number of the first light emitting units 181a and/or the second light emitting units 181b is greater, the power of the individual

light emitting units

181a, 181b may be smaller. Alternatively, when the number of the first light emitting unit 181a and/or the second light emitting unit 181b is small, the power of the single

light emitting unit

181a, 181b may be large.

Alternatively, in some embodiments, the first light emitting unit 181a and the second light emitting unit 181b are aligned in a row in a direction parallel to a width axis (X axis) of the first surface 111, the first light emitting unit 181a is plural in number, the protective layer 11 has a top and a bottom oppositely disposed in a direction parallel to a length axis (Y axis) of the first surface 111, and the second light emitting unit 181b is located below a middle of the top or the bottom of the protective layer 11. The plurality of first light emitting units 181a are distributed at both sides of the second light emitting unit 181 b; or, the number of the second light emitting units 181b is plural, the first light emitting unit 181a is located below the middle of the top or bottom of the protective layer 11, and the plural second light emitting units 181b are located at both sides of the first light emitting unit 181 a; alternatively, the number of the first light emitting unit 181a and the second light emitting unit 181b is plural, and the first light emitting unit 181a and the second light emitting unit 181b are alternately arranged; alternatively, the number of the first light emitting units 181a and the second light emitting units 181b is plural, the orthographic projections of the plural first light emitting units 181a on the first surface 111 are distributed in an axisymmetric manner with respect to the reference axis 130, and the orthographic projections of the plural second light emitting units 181b on the first surface 111 are distributed in a substantially axisymmetric manner with respect to the reference axis 130.

Alternatively, in some embodiments, the light converter 13 includes a first converter facing the first light emitting unit 181a and a second converter facing the second light emitting unit 181b, the first converter and the second converter, the first converter enables the detection light beam 101 emitted by the first light emitting unit 181a to enter the protective layer 11 with or without being deflected to the position of the field of view region V1, and the second converter enables the detection light beam 101 emitted by the second light emitting unit 181b to enter the protective layer 11 with or without being deflected to the position of the field of view region V1. Further optionally, the deflection degree of the detection light beam 101 emitted by the first light emitting unit 181a after passing through the first optical converter is greater than the deflection degree of the detection light beam 101 emitted by the second light emitting unit 181b after passing through the second optical converter. That is, the detection light beam 101 emitted by the first light emitting unit 181a enters the protective layer 11 through the first light converter with a deflection toward the field of view region V1 or with a greater degree of deflection toward the field of view region V1 than the detection light beam 101 emitted by the second light emitting unit 181b enters the protective layer 11 through the second light converter. Further optionally, in some embodiments, an area where the detection beam 101 entering the protection layer 11 through the first converter reaches the first surface 111 for the first time is a fifth preset area, an area where the detection beam 101 entering the protection layer 11 through the second converter reaches the first surface 111 for the first time is a sixth preset area, an area of an overlapping area of the fifth preset area and the field-of-view area V1 is not less than 30% of an area of the field-of-view area V1, and an area of an overlapping area of the sixth preset area and the field-of-view area V1 is not more than 30% of an area of the field-of-view area V1.

In the embodiment of the present application, the

optical detection apparatus

1c, 1d, 1e includes the emitting module 18, the emitting module 18 includes a first light emitting unit 181a and a second light emitting unit 181b, the first light emitting unit 181a can be used for providing the first light beam 101a, and the second light emitting unit 181b can be used for providing the second light beam 101 b. The transmission module 18 can operate in at least two different modes of the first transmission mode, the second transmission mode and the third transmission mode in a time-division manner. Therefore, the emitting module 18 can emit the detecting light beams 101 with different composition ratios in a time-sharing manner, the receiving module 19 receives the detecting light beams 101 with different composition ratios and converts the detecting light beams 101 into electric signals to acquire the biological characteristic information of the external object 1000, and the optical detecting

devices

1c, 1d, and 1e have good detecting effects.

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 of view regions V1 may extend over the upper surface of the entire transparent region 120, thereby enabling full-screen biometric sensing.

Optionally, in some embodiments, the

optical detection device

1, 1a, 1b, 1c, 1d, 1e may further comprise a processor and a memory, the processor being capable of obtaining fingerprint information of the user from the received detection light beam 101, such as, but not limited to, a fingerprint image comprising ridge/valley contrasts. 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.

The

optical detection devices

1, 1a, 1b, 1c, 1d, and 1e according to the embodiments of the present application and the modified embodiments thereof can be used to detect biometric information of an external object, generate an image of the external object, detect the position of the external object, determine whether or not 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 directly contacted by the finger 1000 of the user during fingerprint detection, and is usually the outermost surface of the

optical detection device

1, 1a, 1b, 1c, 1d, 1e or the electronic product comprising the

optical detection device

1, 1a, 1b, 1c, 1d, 1 e. Alternatively, the shape of the field of view region V1 may be square, circular, oval, etc., and is not limited in the embodiments of the present application. 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.

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, 1a, 1b, 1c, 1d, 1e and its modified embodiments are not limited to the detection of fingerprints, and the detection object of the

optical detection apparatus

1, 1a, 1b, 1c, 1d, 1e and its modified embodiments 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 embodiment of the present invention is described with a finger print as a detection object, and it can be understood that lines such as a palm, a toe, a palm print, and a skin surface texture can also be used as features of the detection object or an external object to be detected.

When detecting a fingerprint, the ridge of the fingerprint contacts the first surface 111 (i.e. the outer surface of the optical detection device 1 for the user to touch). In contrast, the valleys of the fingerprint 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.

It should be noted that, in the embodiments of the present application, the

optical detection devices

1, 1a, 1b, 1c, 1d, 1e and others or embodiments are described, and the structures, numbers, positions, driving manners and the like of the light emitting module 11, the light emitting unit 181, the first light emitting unit 181a, the second light emitting unit 181b, the protective layer 11, the detection module 19, the first surface 111, the second surface 112, the light converter 13, the first converting portion 131, the second converting portion 132, the incident angle θ, the first predetermined ratio, the second predetermined ratio, the field of view region V1, the first predetermined region, the second predetermined region, the third predetermined region, the fourth predetermined region, the fifth predetermined region, the sixth predetermined region and the like can be applied to the embodiments of the present application, and others or modified embodiments, and they are replaced, modified, expanded, arranged, combined, matched, collocated, added, or removed, Multiplexing and the like are all within the protection scope of the present application.

Optionally, in some embodiments, a portion of the detection light beam 101 deflected by the light converter 13 on the first surface 111 where the incident angle is greater than or equal to a preset angle is the first light beam 101 a. 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 angle may be 42 degrees. Alternatively, the preset angle is 42 degrees ± 3 degrees in some embodiments, taking into account material and assembly tolerances. Of course, in other or modified embodiments, when the material is different, the refractive index of different materials is different, and the predetermined angle 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.

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, in some embodiments, the detection light beam 101 emitted by the emission module 18 has a light-emitting angle range of 140 degrees along the length axis (Y axis) of the protection layer 11 and a light-emitting angle range of 140 degrees along the width axis (X axis) of the protection layer 11.

In the embodiment of the present application, the display module 12 can be, for example, but not limited to, a liquid crystal display module, an electronic paper display module, a micro-display projector module, etc. 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, where the display layer may be an organic light emitting diode (O L ED) 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.

Optionally, the light emitting unit 181 is, for example, but not limited to, L ED (light emitting diode), L d (laser diode), VCSE L0 (vertical cavity surface emitting laser), Mini-L1 ED, Micro-L2 ED, O L3 ED (organic light emitting diode), Q L ED (quaternary dot light emitting diode), or a light emitting array including one or more of L ED, L D, VCSE L, Mini-L ED, Micro-L ED, O L ED, and Q L ED.

The detection module 19 may be disposed substantially directly below the field of view region V1 for receiving 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 distance between the detection module 19 and the emission module 18 along the length axis direction may be smaller than, greater than or equal to the distance between the field of view region V1 and the emission module 18 along the length axis direction.

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.

Above-mentioned embodiment or change embodiment and corresponding change of this application set up about protective layer, display module assembly, emission module, optical converter, luminescence unit, predetermine regional, the regional structure, the position of waiting of field of view also can use the utility model discloses an in other embodiments, obtain embodiment from this and replace, warp, combination, split, extension, omit etc. all belong to the utility model discloses protection scope.

It should be noted that, the utility model discloses first surface, second surface, play 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 inspection apparatus, comprising:

a display device, the display device comprising:

a protective layer having a first surface for user touch and interaction and a second surface opposite the first surface;

the display module is arranged adjacent to the second surface and can emit visible light through the protective layer to realize image display;

the emission module is positioned below the protective layer and used for emitting a detection light beam, the detection light beam can reach an external object and return, and the detection light beam is invisible light;

the detection module is located below the protective layer and at least partially located below the display module or inside the display module, the detection module is used for receiving detection light beams returned from an external object and converting the detection light beams into corresponding electric signals to obtain biometric information, the detection module has a field angle range, an area of the first surface located in the field angle range is a field area, and the detection light beams include: a first light beam capable of entering the protective layer and totally reflecting within the protective layer at least the first light beam transmitted to the field of view region, and a second light beam capable of passing through the protective layer and exiting from a region outside the field of view region of the first surface above the protective layer; the proportion of the first light beam and the second light beam in the amount of the detection light beam is defined as the composition proportion of the first light beam and the second light beam;

the control unit is connected with the transmitting module and used for controlling the transmitting module to transmit the detection light beams of the first light beam and the second light beam with different composition ratios.

2. The optical inspection device according to claim 1, wherein the emission module comprises a first light-emitting unit and a second light-emitting unit, the first light-emitting unit emits the inspection beam capable of being transmitted by total reflection at least in the protective layer, the second light-emitting unit emits the inspection beam capable of being emitted to the upper side of the first surface, and the first light-emitting unit and the second light-emitting unit are capable of operating simultaneously and/or in time division under the control of the control unit.

3. The optical inspection device of claim 2, wherein there is no air between the first light emitting unit and the second surface, and there is air between the second light emitting unit and the second surface; or the optical detection device further comprises a light converter positioned between the second surface and the first light-emitting unit, the light converter is used for deflecting the detection light beam emitted by the first light-emitting unit to one side of the field area, and the second light-emitting unit and the second surface are arranged at intervals of air.

4. The optical inspection device of claim 2, wherein the first surface has a length axis and a width axis perpendicular to each other, the first and second light emitting cells are aligned in a row parallel to the width axis, the protective layer has a top and a bottom oppositely disposed along the length axis, the number of the first light emitting cells is plural, the second light emitting cell is located below the middle of the top or the bottom of the protective layer, and the plural first light emitting cells are distributed on both sides of the second light emitting cell; or the number of the second light-emitting units is multiple, the first light-emitting unit is located below the middle of the top or the bottom of the protective layer, and the multiple second light-emitting units are located on two sides of the first light-emitting unit; or the number of the first light-emitting units and the second light-emitting units is multiple, and the first light-emitting units and the second light-emitting units are alternately arranged; or the number of the first light-emitting unit and the second light-emitting unit is multiple, and the multiple first light-emitting units and the multiple second light-emitting units are distributed in an axisymmetric manner about a reference axis of the first surface parallel to the length axis.

5. The optical inspection device according to claim 1, wherein the external object is a finger, and at least a part of the first light beam is diffusely reflected at a ridge of the finger when the finger touches on the field of view area; the second light beam can enter the inside of the finger above the first surface and then is transmitted out of the finger; defining a first light beam diffusely reflected at a ridge of the finger and a second light beam transmitted from an inside of the finger as a detection light beam returned from the finger; at least part of the detection light beams returning from the finger can be emitted from the second surface of the protective layer and pass through at least part of the display module to reach the detection module, and the detection module can receive the detection light beams returning from the finger and convert the detection light beams into electric signals to acquire fingerprint characteristic information.

6. The optical detection device according to claim 2, wherein the control unit is configured to control the emission module to operate in a first emission mode and a second emission mode at least at different times, when the emission module operates in the first mode, the control unit controls the first light-emitting unit to operate and the second light-emitting unit to not operate, and when the emission module operates in the second mode, the control unit controls the second light-emitting unit to operate and the first light-emitting unit to not operate; when the first light-emitting unit works, the proportion of the optical power of the first light beam in the detection light beams reaching the external object is not less than a first preset proportion; when the second light-emitting unit works, the proportion of the optical power of the second light beam in the detection light beams reaching the external object is not less than a second preset proportion.

7. The optical inspection device of claim 1, wherein the transmitter module is capable of operating in at least a first transmission mode and a second transmission mode at different times, and when the transmitter module is in the first transmission mode, the optical power of the inspection beam emitted above the passivation layer is smaller than the optical power of the inspection beam transmitted by total reflection in the passivation layer; when the transmitting module is in the second transmitting mode, the optical power of the detection beam emitted to the upper part of the first surface of the protective layer is larger than the optical power of the detection beam transmitted in the protective layer in a total reflection mode.

8. The optical detection device according to claim 7, wherein the external object is a finger, and when the finger touches on the field of view area, the first light beam is diffusely reflected at a contact point of a ridge of the fingerprint and the field of view area and is totally reflected at a position opposite to a valley of the fingerprint; the second light beam can enter the interior of an external object above the first surface and then is transmitted out of the external object, the proportion of the first light beam in the detection light beam emitted by the emission module in the first emission mode is not smaller than a first preset proportion, and the proportion of the second light beam in the detection light beam emitted by the emission module in the second emission mode is not smaller than a second preset proportion.

9. An optical inspection device according to claim 6 or 8, wherein the first predetermined proportion is any value between 60% and 100% and the second predetermined proportion is any value between 60% and 100%.

10. The optical inspection device of claim 1, wherein the inspection beam is capable of reaching and then returning from an external object, the inspection module receives the inspection beam returning from the external object and converts the inspection beam into an electrical signal, the inspection beam returning from the external object comprising: a first light beam diffusely reflected at a contact point of the external object and the field area and a second light beam transmitted after entering the inside of the external object.

11. The optical inspection device of claim 1 wherein the protective layer has a transparent region and a non-transparent region surrounding the transparent region, the transparent region being capable of transmitting the visible light and the inspection beam, the non-transparent region being capable of blocking the visible light and transmitting the inspection beam, the emission module being positioned below the non-transparent region of the protective layer, the inspection module being positioned at least partially below the transparent region of the protective layer, and at least a portion of the field of view region being positioned in the transparent region.

12. The optical inspection device of claim 1 wherein the inspection beam includes or is near infrared light.