In-screen fingerprint sensor structure and electronic equipment

Abstract

The invention discloses an in-screen fingerprint sensor structure, which comprises a display screen, the display screen comprises an upper surface for touch, a plurality of display pixels and a plurality of fingerprint sensor structures, a detection area for fingerprint identification is formed on the upper surface, and the plurality of display pixels and the plurality of fingerprint sensor structures are arranged in the display screen at intervals, the fingerprint sensor structure is used for sensing the detection light returned from the detection area range to obtain fingerprint information; the controller is used for controlling the display pixels to emit display light when the display screen displays a picture, and emitting detection light to the detection area when fingerprint identification is carried out; the processor is used for carrying out fingerprint identification according to comparison between the fingerprint information obtained by the fingerprint sensor and the fingerprint template; and the display screen further comprises light shields which are respectively arranged corresponding to the fingerprint sensors, so as to shield ambient light and detection light reflected back from an area which is not opposite to the fingerprint sensors.

Description

Technical Field

[0001] The present application relates to the field of optoelectronic technology, and in particular to an in-screen fingerprint sensor structure and electronic device that utilizes optical imaging to implement fingerprint detection or other detections. Background Art

[0002] With the advancement of technology and the improvement of people's living standards, users require more functions and fashionable appearance for electronic devices such as mobile phones, tablets, cameras, etc. At present, the development trend of electronic devices such as mobile phones is to have a higher screen-to-body ratio and functions such as fingerprint detection. However, the existing fingerprint detection device needs to occupy the area of ​​the display screen, reducing the screen-to-body ratio of the electronic device. Summary of the invention

[0003] In view of this, the present application provides an in-screen fingerprint sensor structure and an electronic device that can solve the problems of the prior art.

[0004] One aspect of the present application provides an in-screen fingerprint sensor structure, including:

[0005] A display screen, comprising an upper surface for touch, a plurality of display pixels and a plurality of fingerprint sensors, wherein a detection area for fingerprint identification is formed on the upper surface, the plurality of display pixels and the plurality of fingerprint sensors are arranged in the display screen at intervals, and the fingerprint sensor is used to sense detection light returned from the detection area to obtain fingerprint information;

[0006] A controller, used to control the display pixels to emit display light when the display screen displays an image, and to emit detection light to the detection area when fingerprint recognition is performed; and

[0007] A processor, used for performing fingerprint recognition based on the comparison between the fingerprint information obtained by the fingerprint recognition pixel and the fingerprint template;

[0008] The display screen further includes a light shield respectively arranged corresponding to each fingerprint sensor to shield ambient light and detection light reflected from an area not directly facing the fingerprint sensor.

[0009] Another aspect of the present application provides an electronic device, comprising the above-mentioned in-screen fingerprint sensor structure, wherein the upper surface of the display screen is the outer surface of the electronic device.

[0010] The beneficial effect of the present application is that the in-screen fingerprint recognition device provided by the present application can avoid encroaching on the screen-to-body ratio of the electronic device by setting fingerprint recognition pixels for recognizing fingerprint images in the display screen, and setting a light shield can reduce interference from ambient light and detection light in non-facing areas, thereby improving the signal-to-noise ratio of fingerprint recognition. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1It is a front schematic diagram of an embodiment of the in-screen fingerprint recognition device of the present application;

[0012] Figure 2 yes Figure 1 A partial cross-sectional schematic diagram of an in-screen fingerprint recognition device is shown;

[0013] Figure 3 yes Figure 1 A partial cross-sectional schematic diagram of another embodiment of an in-screen fingerprint recognition device is shown;

[0014] Figure 4 It is a front schematic diagram of an embodiment of the in-screen fingerprint recognition device of the present application;

[0015] Figure 5 yes Figure 4 A partial cross-sectional schematic diagram of an in-screen fingerprint recognition device is shown;

[0016] Figure 6 yes Figure 4 A partial cross-sectional schematic diagram of a modified implementation of the in-screen fingerprint recognition device shown;

[0017] Figure 7 yes Figure 4 A partial cross-sectional schematic diagram of a modified implementation of the in-screen fingerprint recognition device shown;

[0018] Figure 8 yes Figure 4 A partial cross-sectional schematic diagram of a modified implementation of the in-screen fingerprint recognition device shown;

[0019] Fig. 9 It is a partial cross-sectional schematic diagram of an embodiment of the in-screen fingerprint recognition device of the present application;

[0020] Fig.10 It is a partial cross-sectional schematic diagram of an embodiment of the in-screen fingerprint recognition device of the present application;

[0021] Fig.11 It is a partial cross-sectional schematic diagram of an embodiment of the in-screen fingerprint recognition device of the present application;

[0022] Fig.12 It is a partial cross-sectional schematic diagram of an embodiment of the in-screen fingerprint recognition device of the present application; DETAILED DESCRIPTION

[0023] In the specific description of the embodiments of the present application, it should be understood that when a substrate, sheet, layer or pattern is referred to as being "on" or "under" another substrate, another sheet, another layer or another pattern, it may be "directly" or "indirectly" on another substrate, another sheet, another layer or another pattern, or one or more intermediate layers may also exist. For the purpose of clarity, the thickness and size of each layer in the drawings of the specification may be exaggerated, omitted or schematically indicated. In addition, the size of the elements in the drawings does not fully reflect the actual size.

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] Further, the described features and structures may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided so that the embodiments of the present application can be fully understood. However, those skilled in the art will appreciate that, even without one or more of the specific details, or by adopting other structures, components, etc., the technical scheme of the present application may also be put into practice. In other cases, known structures or operations are not shown or described in detail to avoid blurring the key points of the present application.

[0026] See also Figure 1 , Figure 2 and Figure 3As shown, the in-screen fingerprint sensor structure 1 includes a display screen 21, the display screen 21 includes an upper surface 101 for touch, a plurality of display pixels 18 and a plurality of fingerprint sensors 19, the upper surface 101 is formed with a detection area V1 for fingerprint recognition, the plurality of display pixels 18 and the plurality of fingerprint sensors 19 are arranged in the display screen 21 at intervals, and the fingerprint sensor 19 is used to sense the detection light returned from the detection area V1 to obtain fingerprint information. The in-screen fingerprint recognition device 1 also includes a controller 35 and a processor 36. The controller 35 is used to control the display pixels 18 to emit display light when the display screen 21 displays a picture, and to emit detection light to the detection area V1 when performing fingerprint recognition. The in-screen fingerprint recognition device 1 also includes a processor, which is used to perform fingerprint recognition based on the comparison between the fingerprint information obtained by the fingerprint sensor 19 and the fingerprint template. Among them, the display screen 21 also includes a light shield 37 respectively arranged for each fingerprint sensor to block ambient light and detection light reflected from an area not directly opposite to the fingerprint sensor 19. For example, the light shield 37 includes a retaining wall 371 and a top eave 372. The retaining wall 371 is arranged around the periphery of the fingerprint sensor 19. The top eave 372 extends from the top of the retaining wall 371 to the middle of the fingerprint sensor 19. A light hole 373 is formed in the middle of the top eave 372 to transmit the detection light of the area facing the fingerprint sensor 19.

[0027] In some embodiments, Figure 3 As shown, it also includes a microlens 38 corresponding to each fingerprint sensor 19, and the microlens 38 is arranged at the center of the light incident surface of the fingerprint sensor 19 to converge the light entering from the light hole 373 to the fingerprint sensor 19.

[0028] Please also see Figure 4 and Figure 5 , Figure 4 is a schematic diagram of an in-screen fingerprint recognition device 1 provided in one embodiment of the present application, Figure 5 yes Figure 4 A partial cross-sectional schematic diagram of the in-screen fingerprint recognition device 1 along line II-II. The in-screen fingerprint recognition device 1 is used to detect features of external objects, such as fingerprints on the user's fingers. However, the in-screen fingerprint recognition device 1 is not limited to the detection of fingerprints, and the detection object of the in-screen fingerprint recognition device 1 can be any external object that can be imaged. The in-screen fingerprint recognition device 1 of the present application is explained by taking the detection of finger fingerprints as an example. It can be understood that the skin surface patterns of the palms, toes, and other parts of the body can also be used as the detection objects of the in-screen fingerprint recognition device 1 of the present application or the features of the external objects to be detected.

[0029] The in-screen fingerprint recognition device 1 includes a light guide unit 100, a detection module 19, a detection light source 16, and a reflection structure 18. The detection module 19 is at least partially located below the light guide unit 100. The detection light source 16 is located at least partially below the light guide unit 100, and is used to emit a detection light 10. The reflection structure 18 is at least partially located below the light guide unit 100, and is used to reflect at least part of the detection light 10 emitted by the detection light source 16 to the light guide unit 100.

[0030] The light guide unit 100 includes a first surface 101 and a second surface 102, and the first surface 101 and the second surface 102 are different surfaces of the light guide unit 100. In this embodiment, the first surface 101 is the upper surface of the light guide unit 100, and the second surface 102 is the lower surface of the light guide unit 100, and the upper surface and the lower surface are arranged oppositely. Optionally, in other or modified embodiments, the light guide unit 100 includes an upper surface and a lower surface arranged oppositely. The first surface 101 is the upper surface of the light guide unit 100. The second surface 102 can be an inclined surface or a side surface of the light guide unit 100, and the inclined surface or the side surface is located between the upper surface and the lower surface. Optionally, the first surface 101 is a plane, or the main body of the first surface 101 is a plane, and the edge portion located at the main body is a curved surface. The detection light 10 emitted by the detection light source 16 enters the interior of the light guide unit 100 through the second surface 102 of the light guide unit 100, and is projected onto at least one preset area P1 of the first surface 101. The preset area P1 is defined as the area where the detection light 10 enters the interior of the light guide unit 100 from the second surface 102 of the light guide unit 100 and reaches the first surface 101 for the first time after transmission. The number of the preset areas P1 can be one or more. The detection module 19 is used to receive the detection light returned by the external object and convert it into an electrical signal to detect the external object. The detection module 19 has a detection area V1 on the first surface 101 of the light guide unit 100. The detection area V1 is the touch area of ​​the user's finger on the first surface 101 during fingerprint detection, and is also the part of the first surface 101 located in the maximum range that the detection module 19 can receive the light beam. The first surface 101 of the light guide unit 100 is the surface that the user's finger directly contacts during fingerprint detection, and is usually the outermost surface of the in-screen fingerprint recognition device 1 or the electronic device including the in-screen fingerprint recognition device 1. For the convenience of description, the preset area P1 can also be regarded as the area where the detection light 10 directly irradiates the first surface 101.

[0031] Part or all of the detection light 10 meets the conditions for total reflection transmission in the light guide unit 100. Because the light guide unit 100 is in an air medium with a uniform refractive index, according to the principle of light refraction, when the light passes through the light guide unit 100, if the incident surface and the exit surface are parallel to each other, then no matter what the incident angle of the light is, the light entering the light guide unit 100 will be emitted from the light guide unit 100 in parallel to the incident direction and cannot be transmitted by total reflection in the light guide unit 100. Therefore, at least a portion of the detection light 10 that can be totally reflected and propagated in the light guide unit 100 is defined as the first detection light 11, and the area where the first detection light 11 enters the light guide unit 100 from the second surface 102 is the first light entrance area 1021. The first light entrance area 1021 is arranged non-parallel to the part of the first surface 101 onto which the first detection light 11 is projected, so that the detection light 10 that enters the light guide unit 100 from the first light entrance area 1021 can meet the condition of achieving total reflection on the projected first surface 101 by adjusting the incident angle, and becomes the first detection light 11 that can be totally reflected and propagated in the light guide unit 100. The first light entrance area 1021 can be a plane or a non-plane, for example, a curved surface. The number of the first light entrance areas 1021 can be one or more. It should be noted that not all the detection light 10 incident on the light guiding unit 100 from the first light incident area 1021 at any angle can be totally reflected on the corresponding first surface 101, because the angle of incidence of the light at the interface needs to be greater than the relevant critical angle of total reflection. Therefore, the detection light 10 incident from the first light incident area 1021 is not necessarily totally reflected on the first surface 101, but has the possibility of being totally reflected on the first surface 101 by adjusting the incident angle of the detection light 10.

[0032] In this embodiment, the detection light 10 entering the light guide unit 100 is a non-collimated light beam or a non-parallel light beam. The non-collimated light detection light 10 includes a plurality of detection light beams, and the angle between at least two detection light beams is not less than 10 degrees, 15 degrees, 20 degrees, or 25 degrees. The detection light 10 is invisible light, including but not limited to near-infrared light. The near-infrared light is, for example, a light beam with a wavelength range of 750nm to 2000nm (nanometers). For example, but not limited to, the detection light 10 is a near-infrared light with a wavelength of 800nm ​​to 1200nm.

[0033] In this embodiment, the first surface 101 is arranged opposite to the second surface 102. After the detection light 10 enters the light guide unit 100 from the second surface 102, the first detection light 11 therein realizes total reflection propagation in the light guide unit 100 by total reflection on the first surface 101 and the second surface 102 respectively. Optionally, in some embodiments, when the first surface 101 and the second surface 102 are not arranged opposite to each other, after the detection light 10 enters the light guide unit 100 from the second surface 102, it can realize total reflection propagation in the light guide unit 100 by total reflection between the first surface 101 and other surfaces opposite to the first surface 101.

[0034] Optionally, no less than 20%-30% of the detection light 10 irradiated to the preset area P1 meets the condition of total reflection transmission in the light guide unit 100. Of course, the proportion of the first detection light 11 irradiated to the preset area P1 that meets the condition of total reflection transmission to the total detection light 10 can be greater than 30%, 40%, or 50%. At this time, the current or power of the detection light source 16 can be appropriately adjusted accordingly, so as to reduce energy consumption and heat generation. When the proportion of the first detection light 11 irradiated to the preset area P1 that meets the condition of total reflection transmission to the total detection light 10 is less than 20% or 10%, the current or power of the detection light source 16 needs to be increased accordingly to meet the light intensity required for fingerprint optical imaging.

[0035] In this embodiment, the preset area P1 is the detection area V1 of the detection module 19 on the first surface 101 of the light guide unit 100. In other or modified embodiments, the area of ​​the preset area P1 is smaller than the detection area V1, and the preset area P1 may be located in the detection area V1. Alternatively, the preset area P1 partially overlaps with the detection area V1. When there is an overlapping area between the preset area P1 and the detection area V1, the overlapping portion of the two is defined as the overlapping area, and the non-overlapping area of ​​the two is defined as the non-overlapping area, and at least part or all of the non-overlapping area is closer to the detection light source 16 than the overlapping area. The area of ​​the overlapping area is not less than 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80% of the area of ​​the detection area V1. Alternatively, there is no overlap between the preset area P1 and the detection area V1. When there is no overlap between the preset area P1 and the detection area V1 , the preset area P1 and the detection area V1 are arranged at an interval or adjacent to each other, and the preset area P1 is closer to the detection light source 16 than the detection area V1 .

[0036] Optionally, in some embodiments, the in-screen fingerprint recognition device 1 is used in an electronic device, and the electronic device includes a midline from its top to its bottom, and the center of the detection area V1 is located on the midline or is arranged close to the midline. The center of the preset area P1 is located on the midline or is arranged close to the midline. The preset area P1 is closer to the bottom edge of the electronic device than the detection area V1. The interval between the detection area V1 and the bottom edge of the electronic device is 3 to 20 mm, or 3 to 15 mm, or 3 to 10 mm. The detection light source 16 is closer to the bottom edge of the electronic device than the detection module 19, and the horizontal distance between the detection module 19 and the detection light source 16 is 10 to 15 mm.

[0037] Optionally, in some embodiments, there is a shortest straight line between the first light incident area 1021 and the overlapping area, and the light in the detection light 10 that takes the shortest straight line as the propagation path meets the condition of total reflection transmission in the light guide unit 100. That is, the incident angle of the light with the shortest straight line as the propagation path on the overlapping area is not less than the critical angle of total reflection transmission of the detection light 10 in the light guide unit 100. Because the light with the shortest straight line as the propagation path has the smallest incident angle among the detection light rays 10 that propagate from the first light incident area 1021 to the overlapping area, if the light with the shortest straight line as the propagation path meets the condition of total reflection, then the detection light rays 10 directly projected from the first light incident area 1021 to the overlapping area all meet the condition of total reflection transmission in the light guide unit 100.

[0038] Optionally, in some embodiments, the angle between the shortest straight line between the first light incident area 1021 and the detection area V1 and the normal of the first surface 101 of the light guide unit 100 is not less than the critical angle for the detection light 10 to achieve total reflection transmission in the light guide unit 100. Therefore, the detection light directly projected from the first light incident area 1021 to the detection area V1 can achieve total reflection propagation. Exemplarily, the light guide unit 100 is, for example but not limited to, transparent glass, whose refractive index n1=1.5. The refractive index of air n0=1.0. The critical angle of total reflection is 42 degrees. Optionally, taking into account material and assembly errors, in some embodiments, the critical angle of total reflection is 42 degrees ± 3 degrees.

[0039] When the detection area V1 is not touched by a user's finger, the first detection light 11 transmitted by total reflection from the preset area P1 continues to transmit by total reflection in the detection area V1 and will not be emitted from the light guide unit 100 .

[0040] The fingerprint 1000 has a ridge 1100 and a valley 1200. When the detection area V1 is touched by a user's finger, the ridge 1100 contacts the first surface 101 of the light guide unit 100. The valley 1200 does not contact the first surface 101 of the light guide unit 100. There is a spacer between the valley 1200 and the first surface 101, such as air, etc. The embodiment described in the present application is described with the spacer being air. It can be understood that other possible spacers such as grease, dirt, water and other substances also fall within the scope of the present application, and the embodiment of the present application is not limited to this. The detection light 10 is diffusely reflected at the fingerprint ridge 1100 that contacts the detection area V1, and the detection light 10 is totally reflected at the detection area V1 and the fingerprint valley 1200. Among them, at least part of the diffusely reflected detection light 10 passes through the light guide unit 100 and is received by the detection module 19. The conditions for the detection light 10 to be totally reflected and propagated in the light guide unit 100 include: the detection light 10 is totally reflected at the first surface 101 of the light guide unit 100 where it does not contact the ridge 1100 of the fingerprint, and is totally reflected on the second surface 102 of the light guide unit 100 .

[0041] The detection module 19 is located below the second surface 102 of the light guide unit 100. The detection module 19 is used to receive the detection light 10 emitted from the second surface 102 of the light guide unit 100, and convert the received detection light 10 into a corresponding electrical signal to obtain fingerprint information. The electrical signal can be used for optical imaging or fingerprint detection of the fingerprint 1000.

[0042] The vertical projection area of ​​the detection module 19 on the first surface 101 is smaller than the area of ​​the detection area V1, or the vertical projection of the detection module 19 on the first surface 101 is located within the detection area V1. The in-screen fingerprint recognition device 1 collects diffusely reflected detection light 10 for imaging, thereby realizing fingerprint detection and recognition. The diffusely reflected detection light 10 can enter the detection module 19 at different incident angles, and the volume of the detection module 19 is relatively small.

[0043] The light guide unit 100 includes a protective layer 103 and a light conversion unit 104. The detection light 10 emitted from the detection light source 16 enters the protective layer 103 through the light conversion unit 104. At least a portion of the detection light 10 entering the protective layer 103 can be totally reflected and propagated in the protective layer 103. The surface of the light conversion unit 104 that is not parallel to the first surface 101 serves as the first light entrance area 1021 of the light guide unit 100. Figure 2As shown, in this embodiment, the protective layer 103 and the light conversion part 104 are an integrally formed structure. The light conversion part 104 is at least one protrusion 104 extending from the protective layer 103 in a direction opposite to the first surface 101, and the protrusion 104 includes at least one inclined surface facing the reflective structure 18. The inclined surface is arranged non-parallel to the first surface 101 of the light guide unit 100. The inclined surface serves as the first light entrance area 1021 of the light guide unit 100. The number of the inclined surfaces may be one or more. The shape of the protrusion 104 may be, but is not limited to, a prism, a pyramid, a prism, a cone, a truncated cone, and a cylinder. The number of the protrusions 104 may also be one or more. It can be understood that the plurality of protrusions 104 may be closely connected to each other or may be arranged at intervals, and the present application does not limit this.

[0044] like Figure 6 As shown, in other modified embodiments, the protective layer 103 and the light conversion unit 104 are independent components. The protective layer 103 includes an upper surface 1031 and a lower surface 1032 that are arranged opposite to each other. The upper surface 1031 of the protective layer 103 is the first surface 101 of the light guide unit 100. The light conversion unit 104 includes a light incident surface 1041 and a light emitting surface 1042, the light incident surface 1041 is used to receive the detection light 10, and the light emitting surface 1042 is used to emit the detection light 10. The light conversion unit 104 is located below the protective layer 103, and the light emitting surface 1042 is in contact with at least a portion of the lower surface 1032 of the protective layer 103. At least a portion of the light incident surface 1041 is arranged non-parallel to the first surface 101 of the light guide unit 100, so as to serve as the first light incident area 1021 of the light guide unit 100. At least a portion of the detection light 10 that enters the light conversion unit 104 from the light incident surface 1041 enters the protective layer 103 through the interface between the light emitting surface 1042 and the lower surface 1032 of the protective layer 103 for total reflection propagation. The refractive index of the protective layer 103 is substantially the same as that of the light conversion unit 104, so that the detection light 10 will hardly change its angle when passing through the interface between the light emitting surface 1042 and the lower surface 1032 of the protective layer 103.

[0045] The optical conversion part 104 can be but is not limited to a prism. The prism, for example a triangular prism, includes a light incident surface 1041 and a light emitting surface 1042. The light incident surface 1041 and the light emitting surface 1042 are both planes. The angle formed between the light incident surface 1041 and the light emitting surface 1042 is an acute angle. The light incident surface 1041 is arranged toward the reflective structure 18. The light emitting surface 1042 is attached to the lower surface 1032 of the protective layer 103. The upper surface 1031 and the lower surface 1032 of the protective layer 103 are arranged parallel to each other, so the angle formed between the light incident surface 1041 and the upper surface 1031 of the protective layer 103 is also an acute angle, and the entire light incident surface 1041 can be used as the first light incident area 1041 of the light guide unit 100.

[0046] like Figure 6 As shown, in other modified embodiments, the optical conversion part 104 can also be an optical film. The optical film 104 includes a third surface and a fourth surface arranged opposite to each other. The third surface, as the light emitting surface 1042 of the optical conversion part 104, is bonded to at least part of the lower surface 1031 of the protective layer 103. The fourth surface is the light incident surface 1041 of the optical conversion part 104, and one or more protrusions are formed on the fourth surface. The protrusion includes at least one inclined surface arranged toward the reflective structure 18, and the inclined surface is arranged non-parallel to the upper surface 1031 of the protective layer 103 to serve as the first light incident area 1021 of the light guide unit 100. The number of the inclined surfaces can be one or more, and the inclined surface is arranged non-parallel to the upper surface 1031 of the protective layer 103 and faces the reflective structure 18. The shape of the protrusion can be, but is not limited to, a prism, a pyramid, a prism, a cone, a truncated cone, and a cylinder. The number of the protrusions may also be one or more, and the multiple protrusions may be closely connected to each other or arranged at intervals, which is not limited in the present application.

[0047] The reflective structure 18 is located below at least a portion of the second surface 102 of the light guide unit 100. The reflective structure 18 includes a reflective surface 180, which is used to reflect at least a portion of the detection light 10 emitted from the detection light source 16 to the first light incident area 1021 of the second surface 102. The reflective structure 18 can be, but is not limited to, a reflective film layer, a reflective sheet, and a reflective prism. In this embodiment, the reflective surface 180 is perpendicular or approximately perpendicular to the first surface 101. The detection light source 16 has a light-emitting surface 160 that emits the detection light 10, and the light-emitting surface 160 of the detection light source 16 is parallel or approximately parallel to the first surface 101. The detection light 10 emitted by the detection light source 16 is a non-collimated light beam with a preset light-emitting angle range. The light-emitting angle range can be, but is not limited to, 25 degrees to 140 degrees, or 50 degrees to 140 degrees. Therefore, a portion of the detection light 10 emitted by the detection light source 16 can directly irradiate the first light incident area 1021 of the second surface 102, and another portion is reflected by the reflection surface 180 of the reflection structure 18 to the first light incident area 1021 of the second surface 102. It can be understood that in other or modified embodiments, the light emitting surface 160 of the detection light source 16 can also be inclined to the first surface 101, for example, the angle formed with the first surface 101 is an acute angle, and faces the detection area V1.

[0048] Alternatively, if Figure 6 As shown, the light emitting surface 160 of the detection light source 16 may also be inclined to the first surface 101, for example, the angle between the light emitting surface 160 and the first surface 101 is an acute angle. The light emitting surface 160 is inclined toward the reflection surface 180 of the reflection structure 18. The detection light 10 emitted by the detection light source 16 may be completely reflected to the second surface 102 via the reflection surface 180.

[0049] Alternatively, if Figure 6 As shown, the light emitting surface 260 of the detection light source 26 may also be perpendicular or substantially perpendicular to the first surface 101 of the light guide unit 100, and the detection light source 26 emits the detection light 20 toward the reflective structure 28. The reflective surface 280 of the reflective structure 28 is inclined at the first surface 101 of the light guide unit 100 and faces the side where the detection area V2 is located. At least a portion of the detection light 20 is reflected by the reflective surface 280 onto the light incident surface 2041 of the light conversion portion 204. It is understandable that the light emitting surface 260 of the detection light source 26 may also be inclined at the first surface 101 of the light guide unit 100, as long as the light emitting surface 162 faces the reflective structure 14 and the emitted detection light can be reflected by the reflective structure 14 to the second surface 102 of the protective layer 10.

[0050] Alternatively, if Fig. 9 As shown, the light emitting surface 260 of the detection light source 26 may also be perpendicular or substantially perpendicular to the first surface 2031 of the light guide unit 200, and the detection light source 26 emits the detection light 20 toward the side where the detection area V2 is located. The reflection structure 28 is located between the detection light source 28 and the detection area V2. The reflection surface 280 of the reflection structure 28 is arranged parallel to and opposite to the first surface of the light guide unit 200. A portion of the detection light 20 emitted by the detection light source 26 that diverges upwards may be directly irradiated to the light incident surface 2041 of the light conversion portion 204, and a portion that diverges downwards may be reflected to the light incident surface 2041 of the light conversion portion 204 through the reflection surface 280 of the reflection structure 28.

[0051] like Figure 4 As shown, the in-screen fingerprint recognition device 1 also includes a middle frame 15. The middle frame 15 is used to accommodate and carry the light guide unit 100, the detection light source 16, the detection module 19 and the reflective structure 18. The light guide unit 100, the detection light source 16, the detection module 19 and the reflective structure 18 can be fixedly connected or detachably connected to the middle frame 15 by glue, double-sided tape, adhesive, bolts, brackets, buckles, slots, welding and the like. The middle frame 15 includes a bottom 150 and a side wall 152. The bottom 150 is arranged opposite to the second surface 102, and the side wall 152 extends from the edge of the bottom 150 and surrounds the periphery of the light guide unit 100. The side wall 152 includes an inner surface 154, and the portion of the inner surface 154 adjacent to the first light incident area 1021 is defined as a functional area 156. In this embodiment, the functional area 156 of the inner surface 154 is a plane perpendicular to or approximately perpendicular to the first surface 101. The reflective structure 18 is a reflective film layer plated on the functional area 156 of the inner surface 154. The detection light source 16 is located between the reflective structure 18 and the detection area V1, and the light emitting surface 160 of the detection light source 16 is parallel or substantially parallel to the first surface 101. A part or all of the detection light 10 emitted by the detection light source 16 is reflected to the second surface 102 via the reflective film layer 18 disposed on the functional area 156.

[0052] Optionally, the reflective structure 18 disposed on the functional area 156 of the inner surface 154 may also be a reflective sheet. The reflective sheet 18 is made of a material capable of reflecting the detection light 10. The reflective sheet 18 is disposed on the functional area 156 of the inner surface 154 by bonding.

[0053] Alternatively, if Figure 5As shown, in order to adapt to the different emission directions of the detection light 20, the functional area 256 of the inner surface 254 can also be a plane inclined to the first surface 2031. The angle between the functional area 256 of the inner surface 254 and the first surface 2031 is an acute angle. The reflective structure 28 can be a reflective film layer plated on the functional area 256 or a reflective sheet arranged on the functional area 256. It is understandable that the inclination angle of the functional area 256 can be adjusted according to the emission direction of the detection light 20 and the position on the second surface 2032 to be irradiated after reflection, and the present application does not make specific restrictions here. The light-emitting surface 260 of the detection light source 26 is perpendicular or approximately perpendicular to the first surface 2031, and emits the detection light 20 toward the reflective structure 28.

[0054] It is understandable that the light-emitting surface 260 of the detection light source 26 can also have a variety of different light-emitting directions. For example, the light-emitting surface 162 of the detection light source 16 is inclined at the first surface 101 of the protective layer 10 and emits the detection light 20 toward the reflective structure 28, as long as the reflected detection light 20 can illuminate the preset position on the second surface 2032, for example, the light incident surface 2041 on the light conversion part 204.

[0055] Alternatively, if Figure 6 As shown, the functional area 256 of the inner surface 254 can also be a non-planar surface. For example, the functional area 256 is a concave curved surface. The concave curved surface 256 is located below the non-display area or non-transparent area 210 of the protective layer 203 and faces the side where the detection area V2 is located. The reflective structure 28 is a reflective film layer plated on the concave curved surface 256.

[0056] Alternatively, if Figure 7 As shown, the functional area 256 of the inner surface 254 is a plane perpendicular to or substantially perpendicular to the first surface 2031. The reflective structure 28 is a reflective prism disposed on the functional area 256. The reflective prism 28 includes a reflective surface 280, and the reflective surface 280 is inclined to the first surface 2031 of the light guide unit 200 and faces the side where the detection area V2 is located. The angle formed between the reflective surface 280 and the first surface 2031 of the light guide unit 200 is an acute angle. The detection light source 26 is located below the backlight unit 214 in the transparent area 220, and the light emitting surface 260 of the detection light source 26 emits the detection light 20 toward the reflective structure 28. At least a portion of the detection light 20 is reflected by the reflective surface 280 of the reflective structure 28 to the light incident surface 2041 of the light conversion portion 204.

[0057] Alternatively, if Figure 8As shown, the functional area 256 of the inner surface 254 is a plane perpendicular to or substantially perpendicular to the first surface of the light guide unit 200, and the detection light source 26 is arranged on the functional area 256. The light emitting surface 260 of the detection light source 26 is perpendicular to or substantially perpendicular to the first surface of the light guide unit 200, and emits the detection light 20 toward the side where the detection area V2 is located. The reflective structure 28 is arranged at a position adjacent to the functional area 256 at the bottom 250 of the middle frame 25. The reflective structure 28 includes a reflective surface 280, and the reflective surface 280 is parallel or substantially parallel to the first surface 2031 of the light guide unit 200. A portion of the detection light 20 emitted by the detection light source 26 that diverges upward can be directly irradiated to the light incident surface 2041 of the light conversion unit 204, and a portion that diverges downward is reflected to the light incident surface 2041 of the light conversion unit 204 through the reflective surface 280 of the reflective structure 28.

[0058] See also Fig. 9 , is a partial cross-sectional schematic diagram of an embodiment of the present application. The in-screen fingerprint recognition device 2 includes a protective layer 203, a light conversion unit 204, a display module 21, a reflective structure 28, a detection light source 26 and a detection module 29. The protective layer 203 and the display module 21 together constitute a display device. In this embodiment, the protective layer 203 is a light guide unit of the in-screen fingerprint recognition device 2, which includes an upper surface 2031 and a lower surface 2032 relative to each other. The upper surface 2031 of the protective layer 203 is the first surface of the light guide unit, and the lower surface 2032 of the protective layer 203 is at least a portion of the second surface of the light guide unit.

[0059] The display module 21 is located below the protective layer 203, and the display module 21 is used to transmit a visible light beam through the protective layer 203 to realize image display. The detection light source 26 is used to emit a detection light 20, and the detection light 20 includes or is a non-collimated light beam. The detection light 20 is reflected by the reflective structure 28 and incident into the protective layer 203 from the lower surface 2031 of the protective layer 203.

[0060] In this embodiment, the detection light source 26 is located below the display module 21. The light emitting surface 260 of the detection light source 26 may also be perpendicular or approximately perpendicular to the upper surface 2031, and the detection light source 26 emits the detection light 20 toward the reflective structure 28. The inner surface 254 of the side wall 252 of the middle frame 25 includes a functional area 256. The functional area 256 is a plane inclined to the upper surface 2031 of the protective layer 203 and faces the side where the detection area V2 is located. The angle formed between the functional area 256 and the upper surface 2031 is an acute angle. The reflective structure 28 is a reflective film layer plated on the functional area 256. The detection light 20 is reflected by the reflective film layer 28 to the lower surface 2032 of the protective layer 203 or the light incident surface 2041 of the light conversion portion 204.

[0061] The area where the detection light 20 first reaches the upper surface 2031 of the protective layer 203 after transmission is the preset area P2. The preset area P2 is the area where the detection light 20 directly irradiates the upper surface 2031 of the protective layer 203. The detection module 29 has a detection area V2 on the upper surface 2031 of the protective layer 203, and the detection area V2 is the part of the upper surface 2031 of the protective layer 203 that is located within the maximum range that the detection module 29 can receive the detection light 20. When performing fingerprint detection, the detection area V2 is the area for the user's finger to touch. The detection module 29 is located below the protective layer 203 or at least part of the detection module 29 is located below the display module 21. Of course, in other or modified implementations, for example but not limited to, during fingerprint detection, a light source can usually emit visible light at the position of the detection area V2 on the upper surface 2031 of the protective layer 203 to prompt the user to touch the finger at this position. Under the premise of satisfying fingerprint imaging, the area of ​​the upper surface 2031 of the protective layer 203 for the user's finger to touch can overlap with the detection area V2, or the touched area includes the detection area V2, etc., and this application does not limit this. Those skilled in the art can understand that as long as the detection area V2 or at least part of it is the area touched by the finger, it belongs to the protection scope of this application.

[0062] The protective layer 203 has a connected non-transparent area 210 and a transparent area 220. The non-transparent area 210 is located around or at the edge of the transparent area 220. The transparent area 220 is used to transmit visible light. The non-transparent area 210 is used to block visible light. The visible light beam emitted by the display module 21 is emitted to the outside of the in-screen fingerprint recognition device 2 through the transparent area 220 to achieve image display. The non-transparent area 210 is used to block the visible light beam emitted by the display module 21 and the visible light beam in the ambient light, so that the user cannot see the components inside the in-screen fingerprint recognition device 2 in the non-transparent area 210.

[0063] Typically, the area where the display module 21 displays an image is defined as a display area (not marked), and the area around the display area where the image cannot be displayed is a non-display area (not marked). The transparent area 220 is opposite to the display area, and the vertical projection of the transparent area 220 in the display area is located in the display area or completely overlaps with the display area. The non-transparent area 210 covers the non-display area and exceeds the non-display area in a direction away from the non-display area. That is, the area of ​​the non-transparent area 210 is larger than the area of ​​the non-display area. When a user uses the in-screen fingerprint recognition device 2, the display area that the user can actually see on the front of the in-screen fingerprint recognition device 2 is the same size as the transparent area 220.

[0064] Optionally, in some embodiments, the detection area V2 is located directly above the local area of ​​the display area. Further optionally, the detection module 29 includes an image sensor and an ultra-macro lens located above the image sensor, wherein the ultra-macro lens is used to converge the detection light 20 onto the image sensor, and the image sensor is used to convert the detection light 20 into a corresponding electrical signal, and the vertical projection of the ultra-macro lens and the image sensor on the upper surface 2031 is located within the detection area V2, and the area of ​​the vertical projection is smaller than the area of ​​the detection area V2.

[0065] The non-transparent region 210 includes an upper surface (not labeled) and a lower surface (not labeled) disposed oppositely. The transparent region 220 includes an upper surface (not labeled) and a lower surface (not labeled) disposed oppositely. The upper surface 2031 of the protective layer 203 includes the upper surface of the non-transparent region 210 and the upper surface of the transparent region 220. The lower surface 2030 of the protective layer 203 includes the lower surface of the non-transparent region 210 and the lower surface of the transparent region 220.

[0066] The non-transparent area 210 is used to transmit the detection light 20 and block the visible light beam. In an embodiment of the present application, the transmittance of the non-transparent area 210 to the detection light 20 is greater than a preset value. The preset value is 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, or 90%. When the transmittance of the non-transparent area 210 to the detection light 20 is greater, the intensity of the detection light 20 after penetrating the protective layer 203 is greater.

[0067] In addition, the non-transparent area 210 shielding the visible light beam means that the transmittance of the non-transparent area 210 to the visible light beam is less than a preset threshold, for example, 10%, 5%, 1%, or 0%. The non-transparent area 210 shields the visible light beam by, for example, but not limited to, absorbing and / or reflecting the visible light beam.

[0068] The display module 21 is located below the transparent area 220. The light conversion part 204 is located below the non-transparent area 210, and the light emitting surface 2042 of the light conversion part 204 is attached to the lower surface of the non-transparent area 210. In this embodiment, the detection light source 26 is located below the portion of the display module 21 in the transparent area 220, and emits a detection light 20 toward the reflective structure 28. In other modified embodiments, the detection light source 26 can also be located below the non-display area or the non-transparent area 210. The refractive index of the light conversion part 204 is substantially the same as that of the protective layer 203, for example, the refractive index is 1.5. The reflective structure 28 is located below the non-transparent area 210 and is adjacent to the bottom edge of the electronic device to which the in-screen fingerprint recognition device 2 is applied. The detection light 20 emitted by the detection light source 29 is reflected by the reflective structure 28 to the light incident surface 2041 of the light conversion unit 204, and at least a portion of the detection light 20 entering the protective layer 203 through the light incident surface 2041 can be directly projected onto the preset area P2 for total reflection propagation. The detection module 29 is located below the display module 21.

[0069] In this embodiment, the preset area P2 and the detection area V2 of the detection module 29 on the upper surface 2031 of the protective layer 203 have an overlapping area Q2. The detection light 20 irradiated to the overlapping area Q2 meets the conditions of total reflection transmission, and can be diffusely reflected at the contact point with the fingerprint ridge 1100 (when the finger touches the detection area V3); the detection light 20 irradiated to the non-overlapping area meets the conditions of total reflection transmission, can reach the detection area V2 after multiple total reflections, and can be diffusely reflected at the contact point with the fingerprint ridge 1100 (when the finger touches the detection area V3), and then can pass through the protective layer 203 and be received by the detection module 29 located below the protective layer 203. The detection light 20 after diffuse reflection is irradiated in all directions.

[0070] In this embodiment, the preset area P2 and / or the detection area V2 are located on the upper surface of the transparent area 220. Optionally, in other or modified embodiments, at least part of the preset area P2 and / or the detection area V2 is located on the upper surface of the transparent area 220. Optionally, in other or modified embodiments, at least part of the preset area P2 and / or the detection area V2 is located on the upper surface of the non-transparent area 210.

[0071] For the partial area of ​​the detection area V2 except the overlapping area Q2, at least part of the detection light 20 that directly irradiates the non-overlapping area of ​​the preset area P2 that does not overlap with the detection area V2 can be irradiated to the detection area V2 after multiple total reflections, for example but not limited to, can be irradiated to the overlapping area Q2 and / or the part of the detection area V2 that does not overlap with the preset area P2 after multiple total reflections. In addition, at least part of the detection light 20 that directly irradiates the overlapping area Q2 may also be irradiated to the part of the detection area V2 that does not overlap with the preset area P2 after multiple total reflections. These detection light rays 20 that irradiate the detection area V2 after multiple total reflections can be diffusely reflected at the contact point between the detection area V2 and the ridge 1100 and pass through the protective layer 203, and are finally received by the detection module 29 and used for imaging the fingerprint 1000.

[0072] In this embodiment, the display module 21 may be, but is not limited to, a liquid crystal display module, an electronic paper display module, a micro display projector module, etc. The display module 21 may include a display unit 212 located below the protective layer 203 and a backlight unit 214 located below the display unit 212. The backlight unit 214 is used to provide a backlight beam of visible light to the display unit 212, and the display unit 212 is used to display an image using the backlight beam. The display unit 212 and the backlight unit 214 can transmit the detection light 20 emitted from the lower surface 2032 of the protective layer 203 after diffuse reflection at the contact point of the finger ridge 1100 in the detection area V2.

[0073] Optionally, the detection module 29 is at least partially located below the backlight unit 214; or the detection module 29 is located inside the display unit 212, or the detection module 29 is located inside the backlight unit 214, or the detection unit 29 is located between the display unit 212 and the backlight unit 214.

[0074] Optional, such as Fig.10As shown, the backlight unit 214 includes a light guide plate 215, a backlight light source 216 and a circuit board 218. The light guide plate 215 is located below the display unit 212, and the light guide plate 215 includes an incident surface 2150, an exit surface 2152 and a bottom surface 2154. The exit surface 2152 is arranged opposite to the bottom surface 2154. The incident surface 2150 is located on one side of the light guide plate 215 and connects the exit surface 2152 and the bottom surface 2154. The backlight light source 216 emits a backlight beam toward the incident surface 2150, and the backlight beam enters the light guide plate 215 from the incident surface 2150 and is mixed and then emitted from the exit surface 2152 to the display unit 212. The detection light source 26 is located below the non-display area or non-transparent area 210 of the protective layer 203. The detection light source 26 and the backlight light source 216 are both arranged on the circuit board 218. The detection light source 26 is located on the side of the backlight light source 216 facing away from the light guide plate 215. The light emitting surface 260 of the detection light source 26 is perpendicular or approximately perpendicular to the upper surface 2031 of the protective layer 203, and emits the detection light 20 to the reflective structure 28 in the direction away from the side where the backlight light source 216 and the light guide plate 215 are located. The functional area 256 on the inner surface 254 of the middle frame 25 is a concave curved surface. The concave curved surface 256 is located below the non-display area or non-transparent area 210 of the protective layer 203, and faces the side where the detection area V2 is located. The reflective structure 28 is a reflective film layer plated on the concave curved surface. The detection light 20 emitted by the detection light source 26 is reflected by the reflective structure 28 to the light incident surface 2041 of the light conversion unit 204. The circuit board 218 may be, but is not limited to, a flexible circuit board, and the circuit board 218 is used to provide the detection light source 26 and the backlight light source 216 with electrical signals required for emitting light beams, such as, but not limited to, current, voltage, etc. One end of the circuit board 218 is fixed to the edge portion of the bottom surface 2154 adjacent to the incident surface 2150. It is understandable that the circuit board 218 may also be fixedly connected or detachably connected to the side wall 252 and / or the bottom 250 of the middle frame 25 by glue, double-sided tape, adhesive, bolts, brackets, buckles, slots, welding, etc.

[0075] Optionally, the number of the detection light sources 26 may be one or more, and the multiple detection light sources 26 may have different light emission directions and be respectively arranged at different positions. For example, the detection light source 26 may also be arranged on the display unit 212. As long as the light beam emitted by the detection light source 26 can enter the protective layer 203 for total reflection and propagation for fingerprint sensing, it is sufficient.

[0076] Optionally, the detection light source 26 is, for example, but not limited to, one or more of LED (light emitting diode), LD (laser diode), VCSEL (vertical cavity surface emitting laser), Mini-LED, Micro-LED, OLED (organic light emitting diode), QLED (quantum dot light emitting diode), or a light-emitting array composed of one or more of LED, LD, VCSEL, Mini-LED, Micro-LED, OLED, and QLED.

[0077] like Fig.11 As shown, in one embodiment of the present application, the in-screen fingerprint recognition device 2 further includes an optical glue 23, and the upper surface of the optical glue 23 is arranged in close contact with the lower surface 2032 of the protective layer 203. In this embodiment, the light guide unit 200 is the protective layer 203 and the optical glue 23. The upper surface of the protective layer 203 is the first surface of the light guide unit 200, that is, the upper surface of the non-transparent area 210 and the upper surface of the transparent area 220. In some embodiments, the first surface of the light guide unit 200 is the outer surface of the outermost layer of the in-screen fingerprint recognition device 2, and the user's finger can directly touch the first surface of the light guide unit 200. The second surface of the light guide unit 200 includes at least a portion of the lower surface of the optical glue 23.

[0078] The protective layer 203 includes a transparent substrate 221 and a light shielding film 222. The transparent substrate 221 includes an upper surface and a lower surface opposite to each other. The light shielding film 222 is arranged on the edge area of ​​the lower surface of the transparent substrate 221 and is located in the non-transparent area 210. The lower surface of the transparent substrate 221 faces the display module 21, and the upper surface of the transparent substrate 221 faces away from the display module 21. The non-transparent area 210 includes the light shielding film 222 and the portion of the transparent substrate 221 facing the light shielding film 222. The refractive index of the transparent substrate 221 is greater than the refractive index of air. The transparent substrate 221 can be a single-layer structure or a multi-layer structure.

[0079] The transparent substrate 221 includes a soft structure and / or a hard structure. The transparent substrate 221 is made of, for example, one or more materials such as resin, glass, and sapphire.

[0080] The transmittance of the light shielding film 222 to the detection light 20 is greater than the transmittance to the visible light beam. The light shielding film 222 is a single-layer structure or a multi-layer structure. The light shielding film 222 is, for example, an infrared covering ink. However, the light shielding film 222 may also be other suitable structures, such as a multi-layer film structure, which can transmit the detection light 20 and block the visible light. Preferably, the light shielding film 222 at least covers the position of the detection light 20 where the light emitting surface 2042 of the light conversion part 204 is provided on the lower surface of the transparent substrate 221. The optical glue 23 is located below the protective layer 203. The display module 21 is located below the optical glue 23. The optical glue 23 is used to connect the display module 21 and the protective layer 203. The optical glue 23 covers at least a portion of the protective layer 203 located in the transparent area 220. Optionally, in some embodiments, the optical glue 23 covers at least a portion of the protective layer 203 located in the non-transparent area 210. The optical adhesive 23 is made of a transparent material, and the refractive index of the optical adhesive 23 is less than or equal to the refractive index of the protective layer 203. Of course, this application does not limit this. In some embodiments, the refractive index of the optical adhesive 23 or a part thereof may also be greater than the refractive index of the protective layer 203.

[0081] In this embodiment, the refractive index of the protective layer 203 of the light guide unit 200 and the optical adhesive 23 is substantially the same, and for convenience of description, it is referred to as the refractive index of the light guide unit 200. The refractive index of the light guide unit 200 is greater than the refractive index of air. Optionally, in some embodiments, the refractive index of the protective layer 203 is greater than or equal to the refractive index of the optical adhesive 23.

[0082] In this embodiment, the functional area 256 of the inner surface 254 of the middle frame 25 is a plane perpendicular to or approximately perpendicular to the first surface (not marked) of the light guide unit 200. The reflective structure 28 is a reflective prism arranged on the functional area 256. The reflective prism 28 includes a reflective surface 280, which is inclined to the first surface (not marked) of the light guide unit 200 and faces the side where the detection area V2 is located. The angle formed between the reflective surface 280 and the first surface (not marked) of the light guide unit 200 is an acute angle. The reflective prism 28 is, for example, a right-angle prism, including a first right-angle surface and a second right-angle surface that intersect perpendicularly, and an inclined surface connecting the first right-angle surface and the second right-angle surface. Among them, the reflective prism 28 is fixed on the inner surface of the middle frame 25 through the first right-angle surface and the second right-angle surface. The inclined surface serves as the reflective surface 280, which is inclined toward the side where the detection area V2 is located. The detection light source 26 is located below the backlight unit 214 in the transparent area 220, and the light emitting surface 260 of the detection light source 26 emits the detection light 20 toward the reflective structure 28. At least a portion of the detection light 20 is reflected by the reflective surface 280 of the reflective structure 28 to the light incident surface 2041 of the light conversion unit 204.

[0083] like Fig.12 As shown, in one embodiment of the present application, the display unit 212 is a liquid crystal display panel, including an array substrate 241, a liquid crystal layer 242, an alignment film 243, a common electrode 244, a color filter 245, a substrate 246, and a polarizer 247 stacked in sequence from bottom to top. In this embodiment, the common electrode 244, the color filter 245, the substrate 246, and the polarizer 247 together constitute the color filter substrate of the display unit 212.

[0084] The backlight unit 214 is located below the display unit 212. The protection layer 203, the display unit 212 and the backlight unit 214 together form a display device.

[0085] In this embodiment, the functional area 256 of the inner surface 254 of the middle frame 25 is a plane perpendicular to or substantially perpendicular to the first surface of the light guide unit 200, and the detection light source 26 is arranged on the functional area 256. The light emitting surface 260 of the detection light source 26 is perpendicular to or substantially perpendicular to the first surface of the light guide unit 200, and emits the detection light 20 toward the side where the detection area V2 is located. The reflective structure 28 is located between the detection light source 28 and the detection area V2. Specifically, the reflective structure 28 is arranged at a position adjacent to the functional area 256 at the bottom 250 of the middle frame 25. The reflective structure 28 includes a reflective surface 280, and the reflective surface 280 is parallel or substantially parallel to the first surface of the light guide unit 200. A portion of the detection light 20 emitted by the detection light source 26 that diverges upward can be directly irradiated to the light incident surface 2041 of the light conversion unit 204, and a portion that diverges downward is reflected to the light incident surface 2041 of the light conversion unit 204 through the reflective surface 280 of the reflective structure 28.

[0086] In this embodiment, the upper surface of the optical glue 23 is arranged in close contact with the lower surface 2032 of the protective layer 203. The upper surface of the polarizer 247 is arranged in close contact with the lower surface of the optical glue 23. The light guide unit 200 includes the protective layer 203, the optical glue 23 located below the protective layer, and the polarizer 247 located below the optical glue 23. The light guide unit 200 includes a first surface and a second surface relative to each other. Among them, the upper surface 2031 of the protective layer 203 is the first surface of the light guide unit 200, and is also the outer surface of the in-screen fingerprint recognition device 2 that the user's finger directly contacts when performing fingerprint detection. The lower surface of the polarizer 247 is the second surface of the light guide unit 200.

[0087] In this embodiment, the refractive indexes of the polarizer 547, the optical adhesive 53, and the protective layer 52 are substantially the same and greater than the refractive index of air. The light guide unit 200 can be regarded as a uniform medium.

[0088] Optionally, in other or modified implementations, the light guiding unit 200 includes a protective layer 203 , an optical adhesive 23 located below the protective layer 203 , a polarizing plate 247 located below the optical adhesive 23 , and a substrate 246 located below the polarizing plate 247 .

[0089] Optionally, in other or modified implementations, the light guiding unit 200 includes a protective layer 203 , an optical adhesive 23 located below the protective layer 203 , a polarizer 247 located below the optical adhesive 23 , a substrate 246 located below the polarizer 247 , and a color filter 245 .

[0090] Optionally, in other or modified implementations, the light guiding unit 200 includes a protective layer 203 , an optical adhesive 23 located below the protective layer 203 , a polarizer 247 located below the optical adhesive 23 , a substrate 246 located below the polarizer 247 , a color filter 245 , and a common electrode 244 .

[0091] Optionally, in other or modified embodiments, the light guiding unit 200 includes a protective layer 203, an optical adhesive 23 located below the protective layer 203, a polarizer 247 located below the optical adhesive 23, a substrate 246 located below the polarizer 247, a color filter 245, a common electrode 244, and an alignment film 243.

[0092] Optionally, in other or modified embodiments, the light guiding unit 200 includes a protective layer 203, an optical glue 23 located below the protective layer 203, a polarizer 247 located below the optical glue 23, a substrate 246 located below the polarizer 247, a color filter 245, a common electrode 244, an alignment film 243, and a liquid crystal layer 242.

[0093] Optionally, in other or modified embodiments, the light guiding unit 200 includes a protective layer 203, an optical glue 23 located below the protective layer 203, a polarizer 247 located below the optical glue 23, a substrate 246 located below the polarizer 247, a color filter 245, a common electrode 244, an alignment film 243, a liquid crystal layer 242, and an array substrate 241.

[0094] Optionally, in other or modified embodiments, the display module 51 may also have other different structures. For example, but not limited to, the array substrate 541, liquid crystal layer 542, alignment film 543, common electrode 544, color filter 545, substrate 546, and polarizer 547 in this embodiment may be partially omitted, changed, replaced, combined, etc. Those skilled in the art may understand that the embodiments and modified embodiments based on the purpose of the invention of this application all fall within the scope of protection of this application.

[0095] Optionally, in some embodiments, the detection module 29 may also include a processor and a memory, and the processor may obtain the fingerprint information of the user according to the received detection light 20, such as but not limited to a fingerprint image including ridge / valley light and dark contrast. The memory pre-stores biometric information data, and the processor may compare the obtained fingerprint information with the pre-stored fingerprint information data to achieve fingerprint detection and identification. By detecting and identifying fingerprints, the in-screen fingerprint recognition device 5 of the present application may be used for locking or unlocking electronic devices, online payment service verification, identity verification of financial systems or public security systems, access verification of access control systems, and other products and application scenarios.

[0096] In the present application, the in-screen fingerprint recognition devices 1 and 2 can be mobile phones, tablet computers, smart watches, augmented reality / virtual reality devices, human motion detection devices, self-driving cars, smart home devices, security equipment, intelligent robots, or components of the above.

[0097] It should be noted that the term "closely attached" in the description of the present application and the claims may refer to, for example but not limited to: being combined together by lamination, or being closely attached or close with a gap, or being closely connected by an optical medium. The present application does not limit this.

[0098] The in-screen fingerprint recognition devices 1 and 2 of the present application use light guide units 100 and 200 as light guide media for detecting light rays 10 and 20, and inject the detection light rays 10 and 20 into the light guide units 100 and 20 at an angle that satisfies the total reflection transmission condition and transmit the detection light rays 10 and 20 to the detection areas V1 and V2 of the detection modules 19 and 29 through total reflection. The detection light rays 10 and 20 continue to be totally reflected at the positions relative to the fingerprint valleys 1200, and are emitted after being diffusely reflected at the contact points of the fingerprint ridges 1100. The detection modules 19 and 29 receive the diffusely reflected detection light rays 10 and 20 for imaging. Since the characteristics of the diffusely reflected light beams are to diverge in all directions in space, the detection modules 19 and 29 can be roughly set at the position directly below the detection areas V1 and V2 to receive the diffusely reflected detection light rays 10 and 20, which has the advantages of flexible position setting and small size or volume, and can meet the requirements of being set inside electronic devices such as mobile phones.

[0099] The detection light beams 10, 20 emitted by the detection light sources 16, 26 and the detection light beams 10, 20 entering the light guide units 100, 200 for fingerprint sensing are non-collimated light beams, so that the detection light beams 10, 20 can be transmitted through total reflection at a smaller projection divergence angle to cover a larger detection area V1, V2 for fingerprint sensing, which is beneficial to improving the detection efficiency and imaging quality of fingerprint sensing, and is also beneficial to reducing the volume and assembly cost of the detection modules 16, 26.

[0100] Furthermore, the detection light 10, 20 emitted by the detection light sources 16, 26 enters the light guide units 100, 200 through reflection by the reflective structures 18, 28, so that the detection light sources 16, 26 are not limited to being set on the lower surface of the light guide units 100, 200 adjacent to the bottom edge of the electronic device, effectively alleviating the tight space resources of the lower surface of the light guide units 100, 200 adjacent to the bottom edge of the electronic device. At the same time, because the detection light sources 16, 26 do not have to be set close to or adjacent to the light guide units 100, 200, the heat generated by the detection light sources 16, 26 during operation is less transferred to the upper surface of the light guide units 100, 200, thereby solving the problem of hot hands that may be caused by long-term use. Moreover, the air between the detection light sources 16, 26 and the light guide units 100, 200 is also conducive to improving the heat dissipation efficiency of the detection light sources 16, 26.

[0101] The structures and positions of the light guide unit 100, 200, the display module 212, the detection light source 16, 26, the light converter 104, 204, the first light incident area 1042, 2042, the preset areas P1, P2, the detection areas V1, V2, etc. in the above-mentioned embodiments or modified embodiments of the present application and the corresponding modified settings can also be applied to other embodiments disclosed in the present application, and the embodiments obtained therefrom and their replacement, deformation, combination, splitting, expansion, omission, etc. all fall within the protection scope of the present application.

[0102] It should be noted that the light-emitting surface, light-entering surface, etc. that may appear in the description of this application may be an actual physical surface or an imaginary surface, which does not affect the implementation of the technical solution of this application and belongs to the scope of this application. In addition, the "overlap", "coincidence" and "overlap" that may appear in the description of this application should be understood to have the same meaning and can be replaced with each other.

[0103] It should be noted that those skilled in the art can understand that, without paying any creative labor, part or all of the implementation methods of the present application, as well as part or all of the deformation, replacement, change, splitting, combination, expansion, etc. of the implementation methods should be considered to be covered by the inventive ideas of the present application and belong to the protection scope of the present application.

[0104] Any reference in this specification to "one embodiment", "an embodiment", "an example embodiment", etc. indicates that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present application. Such phrases appearing in different places in this specification do not necessarily all refer to the same embodiment. In addition, when a particular feature or structure is described in conjunction with any embodiment, it is claimed that it is within the technical scope of those skilled in the art to implement such feature or structure in conjunction with other embodiments of these embodiments.

[0105] The orientation or positional relationship indicated by “length”, “width”, “up”, “down”, “left”, “right”, “front”, “rear”, “back”, “front”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, etc. that may appear in the specification of this application is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the implementation methods of this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application. Similar numbers and letters represent similar items in the drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms “first”, “second”, etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of this application, the meaning of “multiple” or “multiple” is at least two or two, unless otherwise clearly and specifically defined. In the description of this application, it is also necessary to explain that, unless otherwise clearly specified and limited, "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0106] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The terms used in the claims should not be understood as limiting the invention to the specific implementations disclosed in this specification. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An in-screen fingerprint sensor structure, characterized in that: include: A display screen, comprising an upper surface for touch, a plurality of display pixels and a plurality of fingerprint sensors, wherein a detection area for fingerprint identification is formed on the upper surface, the plurality of display pixels and the plurality of fingerprint sensors are arranged in the display screen at intervals, and the fingerprint sensor is used to sense detection light returned from the detection area to obtain a fingerprint image; A controller, used to control the display pixels to emit display light when the display screen displays an image, and to emit detection light to the detection area when fingerprint recognition is performed; and A processor, configured to perform fingerprint recognition based on a comparison between a fingerprint image obtained by a fingerprint sensor and a fingerprint template; The display screen further includes a light shield respectively arranged corresponding to each fingerprint sensor to shield ambient light and detection light reflected from an area not directly facing the fingerprint sensor.

2. The in-screen fingerprint sensor structure according to claim 1, characterized in that: The light shield includes a baffle wall and a top eave, wherein the baffle wall is arranged around the periphery of the fingerprint sensor, and the top eave extends from the top of the baffle wall to the middle of the fingerprint sensor, and a light hole is formed in the middle of the top eave to transmit the detection light of the area facing the fingerprint sensor.

3. The in-screen fingerprint sensor structure as claimed in claim 2, characterized in that: It also includes a micro lens arranged corresponding to each fingerprint sensor, wherein the micro lens is arranged at the center of the light incident surface of the fingerprint sensor to converge the light entering from the light through hole to the fingerprint sensor.

4. The in-screen fingerprint recognition device according to claim 1, wherein: It also includes a light conversion part, which is arranged below the upper surface. The light conversion part is a prism. The prism includes a light incident surface for receiving the detection light. The angle formed between the light incident surface and the light emitting surface is an acute angle. The light incident surface is arranged toward the reflective structure to serve as the first light incident area.

5. The in-screen fingerprint recognition device according to claim 4, characterized in that: The light conversion part is an optical film, which includes a third surface and a fourth surface arranged opposite to each other. The third surface serves as the light emitting surface of the light conversion part and is in contact with at least a portion of the lower surface of the protective layer. One or more protrusions are formed on the fourth surface, and the protrusions include at least one inclined surface arranged toward the reflective structure, and the inclined surface serves as the first light incident area of ​​the light conversion component.

6. The in-screen fingerprint recognition device according to claim 1, wherein: It also includes a reflective structure, which includes a reflective surface for reflecting the detection light, and the reflective surface is attached to the upper surface of the display screen; or, the reflective surface is inclined to the upper surface and faces the side where the detection area is located, and the angle formed between the reflective surface and the upper surface is an acute angle; or, the reflective surface is arranged relatively parallel to the upper surface; or, the reflective surface is a concave curved surface and faces the side where the detection area is located.

7. The in-screen fingerprint recognition device according to claim 6, characterized in that: The reflective structure may be any one or more combinations of a reflective film layer, a reflective sheet, and a reflective prism.

8. The in-screen fingerprint recognition device according to claim 1, wherein: The display screen also includes a display unit and a backlight unit located below the display unit, the backlight unit is used to provide a backlight beam of visible light to the display unit, and the display unit is used to display an image using the backlight beam. The backlight unit includes a light guide plate, a backlight light source and a circuit board, the backlight light source and the detection light source are both arranged on the circuit board, the backlight light source is used to emit a backlight beam, and the backlight beam enters the light guide plate for mixing and then is emitted toward the display unit.

9. The in-screen fingerprint recognition device according to claim 1, wherein: The area where the detection light entering the protective layer from the display pixel is transmitted and first reaches the upper surface is defined as a preset area, there is an overlapping area between the preset area and the detection area, and the part of the preset area that does not overlap with the detection area is defined as a non-overlapping area, and at least part or all of the non-overlapping area is closer to the detection light source than the overlapping area; or, the preset area and the detection area are non-overlapping, and the preset area is closer to the detection light source than the detection area; or, the preset area is the detection area; Alternatively, the area of ​​the preset region is smaller than the detection region, and the preset region is located within the detection region; or the area of ​​the detection region is smaller than the preset region, and the detection region is located within the preset region.

10. An electronic device, characterized in that: It includes an in-screen fingerprint sensor as described in any one of claims 1 to 9, and the upper surface of the display screen is the outer surface of the electronic device.

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