Optical detection device and electronic equipment

Abstract

The present application discloses an optical detection device, including a display device, an emission module and a detection module. The display device includes a protective layer, which includes a first surface and a second surface arranged opposite to each other. The display module is located below the protective layer and can be used to display information. The emission module is located below the protective layer and is used to emit a detection beam, which can enter the protective layer through the display module and be transmitted by total reflection at least within the protective layer. The detection module has a field of view area on the first surface of the protective layer. When the emission module emits a detection beam to detect an external object in contact with the field of view area, the detection beam is diffusely reflected at the position where the external object contacts the field of view area, and at least part of the diffusely reflected detection beam passes through the protective layer and is received by the detection module by at least part of the display module. The detection module converts the received detection beam into a corresponding electrical signal to obtain biometric information. The present invention also discloses an electronic device.

Description

Technical Field

[0001] The present application relates to the field of optoelectronic technology, and in particular to an optical detection device and electronic device capable of realizing under-screen biometric detection. 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, and cameras. At present, the development trend of electronic devices such as mobile phones is to have a high screen-to-body ratio and functions such as fingerprint detection. In order to achieve a full-screen or near-full-screen effect and make electronic devices have a high screen-to-body ratio, fingerprint detection technology under the screen has come into being. In the prior art, some products use OLED display screens, collect visible light reflected from fingers under the OLED display screen, and use the fingerprint feature information carried by the visible light emitted by the OLED itself after being reflected on the finger to realize fingerprint detection. However, for non-self-luminous displays such as liquid crystal displays (LCDs), due to different screen structures and display principles, LCDs usually need to use visible light provided by a backlight unit to realize display, and visible light cannot penetrate the backlight unit well. Therefore, the visible light reflection method used on OLEDs cannot well realize the detection of fingerprints or other biometrics under the LCD screen. Summary of the invention

[0003] In view of this, the present application provides an optical detection device and an electronic device that can solve or improve the problems of the prior art.

[0004] One aspect of the present invention provides an optical detection device, comprising:

[0005] A display device comprising:

[0006] A protective layer comprising a first surface and a second surface disposed opposite to each other; and

[0007] A display module, located on one side of the second surface of the protective layer, capable of displaying information;

[0008] an emission module, located on one side of the second surface of the protective layer, for emitting a detection light beam, wherein the detection light beam can enter the protective layer via the display module and be transmitted by total reflection at least within the protective layer; and

[0009] The detection module is located on the second surface side of the protective layer. The detection module has a field of view area on the first surface of the protective layer. When the emission module emits a detection light beam to detect an external object in contact with the field of view area, the detection light beam is diffusely reflected at a position where the external object contacts the field of view area. At least part of the diffusely reflected detection light beam passes through the protective layer and at least part of the display module is received by the detection module. The detection module converts the received detection light beam into a corresponding electrical signal to obtain biometric information of the external object.

[0010] In some embodiments, the display module includes a display panel located on one side of the second surface of the protective layer; a connecting layer located between the protective layer and the display panel and used to connect the protective layer and the display panel; a backlight unit located below the display panel, the backlight unit provides visible light, the visible light can pass through the display panel and the protective layer, and the display panel uses the visible light to display information.

[0011] In some embodiments, the detection beam enters the protective layer from the connecting layer, and the detection beam can be transmitted by total reflection in the protective layer, or the detection beam can be transmitted by total reflection in the protective layer and the connecting layer, or the detection beam can be transmitted by total reflection in the protective layer, the connecting layer and at least part of the display panel.

[0012] In some embodiments, the connecting layer has an upper surface facing the protective layer, a lower surface facing the display panel, and a side surface connecting the upper surface and the lower surface, and the detection light beam enters the connecting layer from at least part of the side surface of the connecting layer, and then enters the protective layer from the connecting layer; wherein, the detection light beam is fully reflected and transmitted in the protective layer, including: the detection light beam is fully reflected and transmitted between the first surface and the second surface of the protective layer; the detection light beam is fully reflected and transmitted in the protective layer and the connecting layer, including: the detection light beam is fully reflected and transmitted between the first surface of the protective layer and the lower surface of the connecting layer.

[0013] In some embodiments, the detection beam enters the protective layer from the display panel via the connecting layer, and the detection beam can be transmitted by total reflection in the protective layer, or the detection beam can be transmitted by total reflection in the protective layer and the connecting layer, or the detection beam can be transmitted by total reflection in the protective layer, the connecting layer and at least part of the display panel.

[0014] In some embodiments, the connection layer has an upper surface facing the protective layer and a lower surface facing the display panel, the display panel includes an array substrate, a liquid crystal layer and a color filter substrate stacked in sequence from bottom to top, the color filter substrate is adjacent to the connection layer, the liquid crystal layer is sealed between the color filter substrate and the array substrate, the array substrate is adjacent to the backlight unit, the array substrate, the liquid crystal layer and the color filter substrate respectively have an upper surface, a lower surface and a side surface connecting the upper surface and the lower surface, the detection light beam can enter the display panel from one or more sides of the array substrate, the liquid crystal layer and the color filter substrate, and enter the protective layer through the connection layer after being emitted from the display panel; wherein, the detection light beam is located at the protective layer. Total reflection transmission within the protective layer includes: the detection light beam is totally reflected and transmitted between the first surface and the second surface of the protective layer; the detection light beam is totally reflected and transmitted within the protective layer and the connecting layer includes: the detection light beam is totally reflected and transmitted between the first surface of the protective layer and the lower surface of the connecting layer; the detection light beam is totally reflected and transmitted within the protective layer, the connecting layer and at least part of the display panel includes: the detection light beam can be totally reflected and transmitted between the first surface of the protective layer and the lower surface of the color filter substrate, or the detection light beam can be totally reflected and transmitted between the first surface of the protective layer and the lower surface of the liquid crystal layer, or the detection light beam can be totally reflected and transmitted between the first surface of the protective layer and the lower surface of the array substrate.

[0015] In some embodiments, the detection module has a field of view area on the first surface. When an external object contacts the field of view area, the emission module emits a detection light beam, and the detection light beam can enter the protective layer through the display module. The detection light beam entering the protective layer can be totally reflected in the field of view area.

[0016] In certain embodiments, the protective layer includes a transparent area and a non-transparent area located around or at the edge of the transparent area, the transparent area is used to transmit visible light and a detection beam, the non-transparent area is used to block visible light and transmit the detection beam, the emission module is located below the non-transparent area of ​​the protective layer, and at least a portion of the detection module is located below the transparent area.

[0017] In some embodiments, the orthographic projection of the emission module on the first surface and the orthographic projection of the display panel on the first surface do not overlap or partially overlap.

[0018] In some embodiments, the optical detection device has a length axis and a width axis that are perpendicular to each other, the optical detection device includes a top end and a bottom end that are relatively arranged along the length axis, and the emission module is located at the bottom end of the optical detection device.

[0019] In some embodiments, the display device also includes a middle frame for accommodating the display module and the protective layer, the middle frame having a frame structure of a bottom and a side, the side extending vertically upward along the edge of the bottom to the protective layer, the bottom being located below the backlight unit, and the side being located outside the display panel and the backlight unit.

[0020] In some embodiments, the optical detection device has a length axis and a width axis that are perpendicular to each other, and the optical detection device includes a top end and a bottom end that are relatively arranged along the length axis. The emission module is arranged at the bottom end and is located on the inner wall of the side of the middle frame.

[0021] In some embodiments, the bottom of the middle frame has an opening corresponding to the detection module, and at least a portion of the detection module is located in the opening.

[0022] In some embodiments, the emitting module has a light emitting surface for emitting the detection light beam, the light emitting surface faces the side of the display panel and / or the connecting layer, and is spaced apart from the side of the display panel, and the detection light beam is directly projected onto the side of the display panel and / or the connecting layer.

[0023] In some embodiments, the protective layer, the connecting layer, and the display panel together constitute a light guide unit, the side surface of the connecting layer and the side surface of the display panel together constitute a light entrance area, the detection light beam emitted by the transmitting module enters the light guide unit from the light entrance area, and can be transmitted by total reflection within at least a portion of the light guide unit.

[0024] In some embodiments, when an external object contacts the field of view area, the emission module emits a detection beam, which can enter the protective layer through the display module, and the detection beam entering the protective layer can be totally reflected in the field of view area.

[0025] In certain embodiments, the emission module includes three light-emitting units for emitting detection light beams, wherein the light-emitting units are arranged near the bottom end of the optical detection device and are symmetrically distributed about a central axis, and the central axis is parallel to the length axis of the optical detection device; or the emission module includes four light-emitting units symmetrical about the central axis, which are divided into two groups with two light-emitting units as a group, and the two groups of light-emitting units are symmetrically distributed on both sides of the central axis, and the two light-emitting units in each group are arranged in a row along the width axis direction of the optical detection device; or the emission module includes three groups of light-emitting units, each group of light-emitting units includes two light-emitting units, and the three groups of light-emitting units are symmetrical about the central axis.

[0026] In some embodiments, the emission module includes a light-emitting unit for emitting a detection light beam, and the light-emitting unit is a top-emitting or side-emitting light-emitting element. The light-emitting unit has a light-emitting surface, and the light-emitting surface is used to emit the detection light beam. The light-emitting surface is arranged parallel, inclined or vertically relative to the first surface.

[0027] In some embodiments, the detection module is located below the backlight unit.

[0028] In some embodiments, the optical detection device has a length axis and a width axis that are perpendicular to each other, the backlight unit includes a backlight film, a backlight lamp and a backlight circuit board, the backlight lamp is used to provide visible light, the backlight film is used to provide the visible light provided by the backlight lamp to the display panel in a uniform and surface-emitting manner, the backlight circuit board is electrically connected to the backlight lamp, the backlight circuit board is used to provide an electrical signal to the backlight lamp, the backlight circuit board extends outward at opposite ends or one end in a direction parallel to the width axis of the optical detection device and exceeds the display panel, the portion of the backlight circuit board that exceeds the display panel is defined as an extension portion, the emission module includes one or more light-emitting units for emitting a detection light beam, and the light-emitting unit is arranged on the upper surface or above the extension portion.

[0029] In some embodiments, the optical detection device includes a top end and a bottom end relatively arranged along the length axis direction, the display panel has a notch at the corner near the bottom end of the optical detection device, the extension portion is opposite to the notch, and the orthographic projection of the light-emitting unit on the first surface and the orthographic projection of the display panel on the first surface do not overlap or partially overlap.

[0030] In some embodiments, the emission module further includes a supporting unit, the light emitting unit is disposed on the supporting unit, the supporting unit is disposed on the extending portion, and the supporting unit is used to raise and support the light emitting unit so that the spacing distance between the light emitting unit and the protective layer becomes smaller.

[0031] In some embodiments, the display panel includes an array substrate and a color film substrate that are relatively arranged, and a liquid crystal layer located between the array substrate and the color film substrate, the array substrate is adjacent to the backlight unit, the color film substrate is adjacent to the protective layer, the array substrate has a terminal area that exceeds the color film substrate, and the emission module is arranged on the terminal area.

[0032] In some embodiments, the display panel also includes a flexible circuit board, one end of which is connected to the upper surface of the terminal area and bends outward to extend to the bottom of the backlight unit, and the flexible circuit board has an air avoidance area corresponding to the position of the emission module; or the light-emitting unit is arranged in a portion of the terminal area that is not connected to the flexible circuit board.

[0033] In some embodiments, the connecting layer is optical adhesive.

[0034] In some embodiments, the backlight unit includes a backlight film, a backlight lamp and a backlight circuit board. The backlight film includes a light guide plate, a reflective sheet located below the light guide plate, a diffuser and / or a brightness enhancement sheet located above the light guide plate.

[0035] In some embodiments, the display panel has a first light entrance area that is not parallel to the first surface, the connecting layer has a second light entrance area that is not parallel to the first surface, the optical detection device has a top and a bottom end that are relatively arranged along the length axis, the protective layer includes a transparent area and a non-transparent area around the transparent area, the emission module is located at the bottom end of the optical detection device and below the non-transparent area of ​​the protective layer, the first light entrance area and / or the second light entrance area are adjacent to the emission module; or the first light entrance area and / or the second light entrance area are directly opposite to the emission module; or the first light entrance area is a partial side surface of the outer edge of the bottom end of the display panel facing the optical detection device, and the second light entrance area is a partial side surface of the outer edge of the bottom end of the connecting layer facing the optical detection device.

[0036] In some embodiments, the emission module includes a light emitting unit for emitting a detection light beam, wherein the light emitting unit is a top-emitting or side-emitting light emitting element, and the light emitting unit has a light emitting surface, and the light emitting surface is arranged toward the side of the display module.

[0037] In some embodiments, the detection light beam is near infrared light.

[0038] In some embodiments, the display device is a liquid crystal display device.

[0039] One aspect of the present invention provides an electronic device, comprising any one of the optical detection devices described above.

[0040] The beneficial effect of the present application is that the optical detection device provided by the present application includes an emission module, and the detection light beam emitted by the emission module enters the protective layer through the display module. The detection light beam can be transmitted by total reflection at least within the protective layer, and diffusely reflected at the position where the external object contacts the surface of the light guide unit and returns to the detection module, thereby enabling under-screen detection. The detection light beam can directly enter the display module and then enter the protective layer, and then be projected onto the first surface of the protective layer, without the need for other optical coupling elements to achieve total reflection. Moreover, the emission module does not have to be close to the surface of the display module, and the detection light beam can enter the light guide unit from the air, so that less heat generated by the emission module during operation is transferred to the surface of the light guide unit, thereby solving the problem of hot hands that may be caused by long-term use. Moreover, the air between the emission module and the display module is also conducive to improving the heat dissipation efficiency of the emission module. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic diagram of an embodiment of an optical detection device of the present invention;

[0042] Figure 2 yes Figure 1 A partial cross-sectional schematic diagram of an optical detection device;

[0043] Figure 3 is a schematic diagram of an embodiment of an optical detection device of the present invention;

[0044] Figures 4 to 6 yes Figure 3 A partial schematic diagram of an optical detection device;

[0045] Figure 7 yes Figure 3 A schematic cross-sectional view of a portion of the structure of the display device shown;

[0046] Figure 8 is a schematic diagram of an embodiment of an optical detection device of the present invention;

[0047] Fig. 9 yes Figure 8 Schematic diagram of the middle area;

[0048] Figure 10A-10C Yes Yes Figure 8 Schematic diagrams of different modified embodiments of the optical detection device;

[0049] Fig.11 is a schematic diagram of an embodiment of an optical detection device of the present invention;

[0050] Fig.12 yes Fig.11 A partial cross-sectional schematic diagram of an optical detection device;

[0051] Fig.13 yes Fig.12 Schematic diagram of the middle area;

[0052] Fig.14 yes Fig.11 A partial cross-sectional schematic diagram of an optical detection device;

[0053] Fig.15 yes Fig.11 A partial top view schematic diagram of a modified embodiment of the optical detection device;

[0054] Fig.16 yes Fig.11 A partial top view schematic diagram of a modified embodiment of the optical detection device;

[0055] Fig.17 yes Figure 8 A schematic diagram of a modified embodiment of the optical detection device;

[0056] Fig.18 yes Fig.17 Partial three-dimensional schematic diagram of the optical detection device. DETAILED DESCRIPTION

[0057] 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.

[0058] 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.

[0059] 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.

[0060] Please also read Figure 1 to Figure 2 , Figure 1 is a schematic diagram of a front plan view of an optical detection device 1 provided in an embodiment of the present application, Figure 2 yes Figure 1 A partial cross-sectional schematic diagram of the optical detection device 1 along line AA. The optical detection device 10 is used to detect features of external objects, such as fingerprints on the user's fingers. However, the optical detection device 10 is not limited to the detection of fingerprints, and the detection object of the optical detection device 10 can be any external object that can be imaged. In the present application, the optical detection device 10 is described by taking the detection of finger fingerprints as an example. It can be understood that the skin surface lines of the palms, toes, and other parts can also be used as the detection objects of the optical detection device 10 of the present application or the features of the external objects to be detected. The optical detection device 1 is defined as having a length axis, a width axis, and a thickness axis that are perpendicular to each other. As Figure 1 As shown, the length axis is parallel to the Y axis, the width axis is parallel to the X axis, and the thickness axis is parallel to the Z axis. Among them, the X axis, Y axis, Z axis and their directions are defined only for the convenience of describing the position relationship of the components and do not represent any limitation on the embodiments of the present application. The AA line can be located on the central axis 103 of the optical detection device 1 parallel to the length axis, or the AA line can be located near the central axis 103. The central axis 103 is a straight line parallel to the length axis Y and is located in the middle position along the width axis X direction of the optical detection device 1.

[0061] The optical detection device 1 includes a display device 10, an emission module 16 and a detection module 19. The display device 10 includes a protective layer 11 and a display panel 12 located below the protective layer 11. The emission module 16 is located below the protective layer 11. The emission module 16 is used to emit a detection beam 101. The detection beam 101 can enter the protective layer 11 through the display panel 12 and can be transmitted by total reflection in the protective layer 11.

[0062] The protective layer 11 includes a first surface 111 and a second surface 112 that are arranged opposite to each other. The first surface 111 may be the outermost surface of the optical detection device 1 or the electronic device including the optical detection device 1. It is understood that the protective layer 11 may include a plastic film, a tempered film, or other films attached by the user during actual use. The first surface 111 of the protective layer 11 is the surface that the external object 1000 directly contacts when performing biometric detection. The first surface 111 is the outermost surface of the optical detection device 1, or the first surface 111 is the outermost surface of the electronic device including the optical detection device 1. Here, for example but not limited to, the external object 1000 may be a finger, and the biometric detection is fingerprint feature detection.

[0063] Optionally, in some embodiments, the protective layer 11 includes a connected non-transparent area 110 and a transparent area 120. The non-transparent area 110 is located around or at the edge of the transparent area 120. The transparent area 120 is used to transmit visible light. The non-transparent area 110 is used to block visible light, so that the user cannot see the internal components of the optical detection device 1 in the non-transparent area 110. In an embodiment of the present application, the transmittance of the non-transparent area 10 to the visible light beam is less than a preset threshold value, for example: 10%, 5%, 1%, 0%. It is understandable that the protective layer 11 can realize the function of the non-transparent area 110 to block visible light by providing a shading film (not shown) in the non-transparent area 110 of the second surface 112. The transmittance of the shading film to the detection light beam 11 is greater than the transmittance to the visible light beam. The transmittance of the non-transparent area 210 to the detection light beam 11 is greater than the preset value. The preset value is 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, or 90%. The shading film 222 is a single-layer structure or a multi-layer structure. The shading film is, for example, infrared covering ink. However, the shading film can also be other suitable structures, such as a multi-layer film structure, which can transmit the detection light beam 101 and block visible light.

[0064] Optionally, in some embodiments, the optical detection device 1 has a top end 140 and a bottom end 130 that are relatively arranged along the length axis (Y axis), and at least a portion of the non-transparent area 110 of the protective layer 11 is located at the bottom end 130 of the optical detection device 1. Optionally, a portion of the display panel 12 may be located within the bottom end 130.

[0065] The emission module 16 is located below the non-transparent area 110 and at the bottom 130 of the optical detection device 1. The detection module 19 is located below the transparent area 120 of the protective layer 11. The emission module 16 is located at the middle position of the bottom 130 along the width axis X direction, for example but not limited to, the projections of the emission module 16 and the central axis 103 along the Z axis direction on the first surface 111 intersect each other. Of course, in other or modified embodiments, the emission module 16 can be located at other positions of the bottom 130, for example but not limited to, the emission module 16 can be located on one side or both sides of the central axis 103 of the optical detection device 1. Optionally, the emission module 16 and the display panel 12 are arranged at intervals, and the orthographic projection of the emission module 16 on the first surface 111 and the orthographic projection of the display panel 12 on the first surface 111 do not overlap. Of course, in other or modified embodiments, the orthographic projection of the emission module 16 on the first surface 111 and the orthographic projection of the display panel 12 on the first surface 111 may partially overlap.

[0066] When the emission module 16 emits a detection beam 101 for detection, the detection beam 101 is diffusely reflected at the contact point between the external object 1000 and the first surface 111, and the diffusely reflected part of the detection beam 101 can pass through the protection layer 11 and the display panel 12 and be received by the detection module 19. The detection module 19 converts the received detection beam 101 into an electrical signal, which can be used to obtain biometric information of the external object 1000, such as but not limited to: fingerprint information.

[0067] The display panel 12 includes an upper surface (not numbered) facing the second surface 112, a lower surface (not numbered) opposite to the upper surface, and a side surface 129 located between the upper surface and the lower surface. The detection beam 101 can enter the display panel 12 from the side surface 129, then the detection beam 101 can be emitted from the upper surface of the display panel 12 and enter the protective layer 11 from the second surface 112 of the protective layer 11, and then the detection beam 101 can be transmitted by total reflection in the protective layer 11, that is, the detection beam 101 can be transmitted by total reflection between the first surface 111 and the second surface 112.

[0068] The area where the detection light beam 101 first reaches the first surface 111 after entering the protective layer 11 is defined as a preset area P1. The portion of the first surface 111 within the field of view angle range of the detection module 19 is defined as a field of view area V1. The field of view area V1 is also a sensing area for the biometric features of the external object 1000. The detection module 19 acquires the biometric feature information of the external object 1000 by collecting the detection light beam 101 returned from the field of view area V1 by the external object 1000. For the convenience of description, the preset area P1 can also be regarded as the area directly irradiated by the detection light beam 101 on the first surface 111.

[0069] The detection light beam 101 enters the protective layer 11 and irradiates the preset area P1. Optionally, the preset area P1 and the field of view area V1 overlap. Figure 1 and Figure 2 As shown, the overlapping area is represented by Q1, and the preset area P1 includes the overlapping area Q1 and the irradiation area of ​​the emitting module 16 that is closer to the overlapping area Q1. The area of ​​the overlapping area Q1 is, for example, not less than 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, etc. of the area of ​​the field of view area V1. Therefore, since there are enough detection beams 101 directly irradiated in the field of view area V1, accordingly, it is ensured that there are enough detection beams 101 in contact with the external object 1000, which can improve the detection accuracy of the biometric feature.

[0070] However, alternatively, in some embodiments, the area of ​​the overlapping region Q1 may be less than 40% of the area of ​​the field of view region V1.

[0071] In addition, it is changeable that in some embodiments, there may be no overlap between the preset area P1 and the field of view area V1. The preset area P1 is closer to the emission module 16 than the field of view area V1. The detection light beam 101 irradiated by the emission module 16 to the preset area P1 is transmitted toward the field of view area V1 by total reflection. In this case, since the detection light beam 101 reaches the field of view area V1 indirectly through total reflection transmission, the side of the external object 1000 adjacent to the detection light beam 101 will interrupt the transmission of part of the detection light beam 101, resulting in a decrease in the number of detection light beams 101 reaching the surface of the external object 1000 facing the field of view area V1, which may affect the detection accuracy of the biometric feature.

[0072] Optionally, in some embodiments, the external object 1000 may be a finger, which includes a fingerprint consisting of ridges and valleys. In order to collect fingerprint information of a finger, the finger is usually required to contact the field of view area V1, and when the finger contacts the field of view area V1, the ridge contacts the first surface 111 and there is a gap between the valley and the first surface 111. When the emission module 16 emits a detection beam 101 for detection, the detection beam 101 may be diffusely reflected at the ridge of the finger, so that part of the detection beam 101 can pass through the protective layer 11 and the display panel 12 and be received by the detection module 19. The optical detection device 1 can acquire fingerprint feature information and further realize fingerprint detection by emitting the detection beam 101 to the finger and receiving the detection beam 101 with fingerprint feature information returned by the finger.

[0073] Optionally, the detection light beam 101 entering the protective layer 11 may include: a detection light beam 101a that directly irradiates the contact point between the external object 1000 and the first surface 111 and undergoes diffuse reflection; a detection light beam 101b that irradiates the contact point between the external object 1000 and the first surface 111 and undergoes diffuse reflection after total reflection transmission; and a detection light beam 101c that does not directly irradiate the contact point between the external object 1000 and the first surface 111, or does not irradiate the contact point between the external object 1000 and the first surface 111 after total reflection transmission, and maintains total reflection transmission within the protective layer 11.

[0074] See also Figure 3, is a schematic diagram of an optical detection device 1a according to an embodiment of the present application, and the optical detection device 1a is a modified embodiment of the optical detection device 1. The optical detection device 1a and the optical detection device 1 have basically the same structure. For the convenience of description, the component numbers of the optical detection device 1a and the optical detection device 1 remain consistent. Those skilled in the art can understand that the same number can represent the same component, and can also represent similar components that can be changed, replaced, expanded, and combined. The difference between the optical detection device 1a and the optical detection device 1 is that the optical detection device 1a includes a display device 10, a protective layer 11, a detection module 19 and an emission module 16, and the display device 10 includes a protective layer 11 and a display module (unnumbered) located below the protective layer 11. The detection light beam 101 can enter the protective layer 11 via the display module and be transmitted by total reflection at least in the protective layer 11.

[0075] Optionally, the display module includes a display panel 12, a backlight unit 13, and a connection layer 14. The connection layer 14 is located between the protective layer 11 and the display panel 12, and is used to connect the protective layer 11 and the display panel 12. The connection layer 13 includes an upper surface facing the second surface 112 and a lower surface facing the display panel 12. The backlight unit 13 is used to provide a backlight beam for the display panel 12, and the display panel 12 realizes image display under the illumination of the backlight beam. The backlight beam is visible light.

[0076] For the convenience of description, in the embodiment of the present application, the total reflection transmission of the detection light beam 101 between two surfaces can be referred to as total reflection transmission in all layers or components between the two surfaces.

[0077] Optionally, the detection beam 101 may enter the protective layer 11 through the display panel 12 and / or the connection layer 13, and may be transmitted by total reflection at least within the protective layer 11. For example but not limited to, the connection layer 14 may include or be optical glue or other transparent optical materials.

[0078] Optionally, the detection beam 101 can be emitted from the emission module 16 and enter the connection layer 14, further enter the protection layer 11 through the connection layer 14, and be transmitted by total reflection in the protection layer 11 and the connection layer 14. Specifically, the detection beam 101 can be transmitted by total reflection between the first surface 111 and the lower surface of the connection layer 14.

[0079] Optionally, the connection layer 14 includes an upper surface facing the second surface, a lower surface facing the display panel, and a side surface 149 connecting the upper surface and the lower surface of the connection layer. The display panel 12 includes an upper surface facing the connection layer, a lower surface facing the backlight unit 13, and a side surface 129 connecting the upper surface and the lower surface of the display panel 12. Figure 3 As shown, the connection layer 14 has a side surface 149 located between the upper surface and the lower surface thereof, and the side surface 149 is adjacent to the emission module 16. The detection light beam 101 emitted by the emission module 149 can enter the connection layer 14 from the side surface 149.

[0080] Optionally, in some embodiments, the upper surface and lower surface of each of the connection layer 14 and the display panel 12 are parallel to the first surface 111. The side 129 connects the upper surface and the lower surface of the connection layer 14, and the side 129 connects the upper surface and the lower surface of the display panel 12. Therefore, the portion of the connection layer 14 that is not parallel to the first surface 111 is the side 149 of the connection layer 14. The portion of the display panel 12 that is not parallel to the first surface 111 is the side 129 of the display panel 12. At least a portion of the side 129 of the display panel 12 is defined as the first light incident area, and at least a portion of the side 149 of the connection layer 14 is defined as the second light incident area. The optical detection device 1a has a top and a bottom end that are relatively arranged along the length axis.

[0081] The emission module 16 is located at the bottom of the optical detection device 1a and below the non-transparent area 110 of the protective layer 11. The first light entrance area and / or the second light entrance area are adjacent to the emission module 16; or, the first light entrance area and / or the second light entrance area are directly opposite to at least a portion of the emission module 16; or, the first light entrance area is a partial side surface 129 of the outer edge of the display panel 12 facing the bottom of the optical detection device 1a, and the second light entrance area is a partial side surface 149 of the outer edge of the connection layer 14 facing the bottom of the optical detection device 1a.

[0082] Optionally, the display panel 12 and the connection layer 14 can transmit the detection light beam 101. The detection light beam 101 can be emitted from the emission module 16 and enter the display panel 12, enter the connection layer 14 through the display panel 12, and be transmitted by total reflection in the connection layer 14 and the protective layer 11. Specifically, the connection layer 14 includes an upper surface facing the second surface 112 and a lower surface facing the display panel 12, and the detection light beam 101 can be transmitted by total reflection between the first surface 111 and the lower surface of the connection layer 14.

[0083] Optionally, the detection light beam 101 can enter the connection layer 14 or the display panel 12, and further be totally reflected and transmitted in the protection layer 11, the connection layer 14 and the display panel 12. Specifically, the detection light beam 101 can enter the display device 10 from the connection layer 14 or the display panel 12, and be totally reflected and transmitted between the first surface 111 and the lower surface of the display panel 12.

[0084] Compared with the length and width of the display panel 12, the thickness of the display panel 12 is usually smaller, for example but not limited to: the width of the display panel 12 can be 70 mm, the length can be 150 mm, and the thickness can be 2 mm. There is a certain interval between the light emitting surface of the emission module 16 and the display panel 12. After the detection light beam 101 enters from the side 129 of the display panel 12, it can irradiate the upper surface of the display panel 12 at a larger incident angle.

[0085] Optionally, the upper surface of the display panel 12 is bonded to the lower surface 112 of the protective layer 11 through the connection layer 14. For example but not limited to, the display panel 12 and the protective layer 11 may be fully bonded or frame bonded through the connection layer 14.

[0086] Further optionally, the protection layer 11 may include or be a transparent material, and the portion thereof facing and in contact with the display panel 12 may be regarded as having a uniform refractive index.

[0087] Optionally, the display panel 12 may be a multi-layer structure. The refractive indexes of different layers or different parts of the display panel 12 may be different. The refractive index of the part of the display panel 12 and the protective layer 11 facing and attached to each other is less than the refractive index of the connecting layer 14, and the refractive index of the connecting layer 14 is less than the refractive index of the protective layer 11. After the detection beam 101 enters the protective layer 11, the incident angle of the detection beam 101 on the first surface 111 of the protective layer 11 may not be less than the critical angle of total reflection between the protective layer 11 and the air, and this part of the detection beam 101 can be totally reflected on the first surface 111 of the protective layer 11. After the detection beam 101 enters the connecting layer 14, the incident angle of the detection beam 101 between the lower surface of the connecting layer 14 and the upper surface of the display panel 12 may not be less than the critical angle of total reflection between the display panel 12 and the connecting layer 14, and this part of the detection beam 101 can be totally reflected and propagated between the lower surface of the connecting layer 14 and the first surface 111 of the protective layer 11.

[0088] Optionally, in some embodiments, the protective layer 11 may include or be made of a transparent material, and its refractive index may be, for example, 1.5. The refractive index of air may be, for example, 1.0. In other embodiments, the refractive index of the connecting layer 14 may be between 1.0 and 1.5. Alternatively, the refractive index of the connecting layer 14 and the protective layer 11 may be the same, or the refractive index of the connecting layer 14 may be slightly greater than that of the protective layer 11.

[0089] See also Figure 4 ,yes Figure 3 A partial schematic diagram of the optical detection device 1a, Figure 4 It is shown that the detection light beam 101 can enter the display panel 12 from the side 129 of the display panel 12 and be transmitted by total reflection within the protection layer 11 , the connection layer 14 , and the display panel 12 .

[0090] See also Figure 5 ,yes Figure 3 A partial schematic diagram of the optical detection device 1a, Figure 5 It is shown that the detection light beam 101 can enter the display panel 12 from the side surface 149 of the connection layer 14 and be transmitted by total reflection in the protection layer 11 and the connection layer 14 .

[0091] See also Figure 6 ,yes Figure 3 A partial schematic diagram of the optical detection device 1a, Figure 6 It is shown that the detection light beam 101 can enter the display panel 12 from the side 149 of the connection layer 14 and be transmitted by total reflection within the protection layer 11 , the connection layer 14 and the display panel 12 .

[0092] See also Figure 7 ,yes Figure 3 The schematic cross-sectional view of a part of the structure of the display device 10 is shown. The display panel 12 includes a lower polarizer 121, an array substrate 122, a liquid crystal layer 123, a color filter substrate 124, and an upper polarizer 125 arranged in sequence from bottom to top. The connecting layer 14 connects the lower surface 112 of the protective layer 11 and the upper polarizer 125. The connecting layer 14 connects the lower surface 112 of the protective layer 11 and the upper polarizer 125, and can transmit the detection light beam 101.

[0093] The detection beam 101 can be detected from the side 149 (see Figure 3 ) enters the display device 10, or the detection beam 101 can enter the display panel 12 from the side of at least one of the lower polarizer 121, the array substrate 122, the liquid crystal layer 123, the color filter substrate 124, and the upper polarizer 125. The detection beam 101 can achieve one or more of the following total reflection transmissions:

[0094] A portion of the detection beam 101 may be transmitted by total reflection in the protective layer 11; or a portion of the detection beam 101 may be transmitted by total reflection in the protective layer 11 and the connecting layer 14; or a portion of the detection beam 101 may be transmitted by total reflection in the protective layer 11, the connecting layer 14, and the upper polarizer 125; or a portion of the detection beam 101 may be transmitted by total reflection in the protective layer 11, the connecting layer 14, the upper polarizer 125, and the color filter substrate 124; or a portion of the detection beam 101 may be transmitted by total reflection in the protective layer 11, the connecting layer 14, the upper polarizer 125, the color filter substrate 124, and the liquid crystal layer 123; or A portion of the detection light beam 101 may be transmitted by total reflection in the protective layer 11, the connecting layer 14, the upper polarizer 125, the color filter substrate 124, the liquid crystal layer 123, and the array substrate 122; or a portion of the detection light beam 101 may be transmitted by total reflection in the protective layer 11, the connecting layer 14, the upper polarizer 125, the color filter substrate 124, the liquid crystal layer 123, the array substrate 122, and the lower polarizer 121; or a portion of the detection light beam 101 may be transmitted by total reflection in the protective layer 11, the connecting layer 14, the upper polarizer 125, the color filter substrate 124, the liquid crystal layer 123, the array substrate 122, the lower polarizer 121, and at least part of the backlight unit 13.

[0095] Here, the area where the detection light beam 101 first reaches the first surface 111 after entering the protective layer 11 is defined as a preset area P1. The portion of the first surface 111 within the field of view angle range of the detection module 19 is defined as a field of view area V1. The field of view area V1 is also a sensing area for the biometric features of the external object 1000. The detection module 19 acquires the biometric feature information of the external object 1000 by collecting the detection light beam 101 returned from the field of view area V1 by the external object 1000. For the convenience of description, the preset area P1 can also be regarded as the area directly irradiated by the detection light beam 101 on the first surface 111.

[0096] The detection light beam 101 enters the protective layer 11 and irradiates the preset area P1. Optionally, the preset area P1 and the field of view area V1 overlap. Figure 3 As shown, the overlapping area is represented by Q1, and the preset area P1 includes the overlapping area Q1 and the irradiation area of ​​the emitting module 16 that is closer to the overlapping area Q1. The area of ​​the overlapping area Q1 is, for example, not less than 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, etc. of the area of ​​the field of view area V1. Therefore, since there are enough detection light beams 101 directly irradiated in the field of view area V1, accordingly, it is ensured that there are enough detection light beams 101 in contact with the external object 1000, which can improve the detection accuracy of the biometric feature.

[0097] However, alternatively, in some embodiments, the area of ​​the overlapping region Q1 may be less than 40% of the area of ​​the field of view region V1.

[0098] In addition, it is changeable that in some embodiments, there may be no overlap between the preset area P1 and the field of view area V1. The preset area P1 is closer to the emission module 16 than the field of view area V1. The detection light beam 101 irradiated by the emission module 16 to the preset area P1 is transmitted toward the field of view area V1 by total reflection. In this case, since the detection light beam 101 reaches the field of view area V1 indirectly through total reflection transmission, the side of the external object 1000 adjacent to the detection light beam 101 will interrupt the transmission of part of the detection light beam 101, resulting in a decrease in the number of detection light beams 101 reaching the surface of the external object 1000 facing the field of view area V1, which will affect the detection accuracy of the biometric feature.

[0099] The following describes the implementation of the under-screen fingerprint detection by the optical detection device 1 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 area V1, the ridges of the fingerprint directly contact the field of view area V1, and the valleys of the fingerprint actually have a spacer between them and the field of view area V1. Usually, there is air between the valleys of the fingerprint and the field of view area V1. The valleys of the fingerprint can be regarded as not in direct contact with the first surface 111.

[0100] Part or all of the detection beam 101 can be fully reflected and transmitted in the protective layer 11. The detection beam 101 is fully reflected at the portion of the first surface 111 that is not in direct contact with the finger surface. The detection beam 101 is diffusely reflected at the ridge of the fingerprint that is in contact with the field of view area V1. At least part of the diffusely reflected detection beam 101 passes through the protective layer 11 (first appearance in the specification) and is received by the detection module 19, which converts the received detection beam 101 into a corresponding electrical signal to obtain fingerprint information.

[0101] By receiving the diffusely reflected detection light beam 101, the detection module 19 can obtain corresponding fingerprint information, such as but not limited to, optical image information corresponding to the fingerprint. Since the detection light beam 101 is diffusely reflected only at the contact point between the first surface 111 and the ridge, and is still fully reflected at the point where the first surface 111 is opposite to the valley, the fingerprint information collected by the detection module 19 can have a good contrast, thereby having a higher accuracy and efficiency when performing fingerprint feature information recognition.

[0102] Optionally, in some embodiments, the protective layer 11, the connecting layer 14, and the display panel 12 together constitute a light guide unit, and the side 149 of the connecting layer 14 and the side 129 of the display panel 12 together constitute a light entrance area. The emission module 16 emits a detection light beam 101, and the detection light beam 101 enters the light guide unit through the light entrance area, and can be fully reflected and transmitted between the first surface 111 and a certain medium interface of the light guide unit, that is, the detection light beam 101 enters the light guide unit from the light entrance area, and can be fully reflected and transmitted in at least part of the light guide unit. The optical detection device 1a can fully reflect and propagate the detection light beam 101 through the light guide unit to the position where the external object 1000 contacts the first surface 111, so that the detection light beam 101 is diffusely reflected at the contact position and returns to the detection module 19, thereby realizing under-screen detection. The detection light beam 101 can directly enter the light guide unit through the light entrance area to realize full reflection propagation, without the need to use additional optical coupling elements to enter the light guide unit to realize full reflection. The detection light beam 101 can enter the light guide unit from the air, and the emission module 16 does not need to be close to the surface of the light guide unit. The emission module 16 can be spaced apart from the light entry area or the light guide unit. Therefore, less heat generated by the emission module 16 during operation is transferred to the light guide unit and the first surface 111, thereby solving the problem of being hot to the touch after long-term use. Moreover, the air space between the emission module 16 and the light guide unit is also conducive to improving the heat dissipation efficiency of the emission module 16.

[0103] Furthermore, the detection module 19 of the optical detection device 1a receives the diffusely reflected detection light beam 101 and converts it into an electrical signal to obtain biometric information of the external object 1000, including but not limited to fingerprint information.

[0104] Please also see Figure 8 and Fig. 9 , Figure 8 is a schematic diagram of an optical detection device 1b according to an embodiment of the present application, wherein Fig. 9 yes Figure 8An enlarged schematic diagram of the middle area M1b. For the convenience of description, the component numbers of the optical detection device 1b and the optical detection device 1a are consistent. Those skilled in the art can understand that the same number can represent the same component, and can also represent similar components that can be changed, replaced, expanded, and combined. The optical detection device 1b includes a display device 10, an emission module 16, and a detection module 19. The display device 10 is, for example, but not limited to, a liquid crystal display device. The emission module 16 emits a detection light beam 101. The detection light beam 101 passes through the display device 10 to reach the external object 1000, and then returns from the external object 1000 and is received by the detection module 19. The detection module 19 converts the received detection light beam 101 into an electrical signal, and obtains the biometric information of the external object 1000 through the electrical signal.

[0105] It should be noted that Figure 8 , the optical path of the detection beam 101 transmitted by total reflection between the protective layer 11 and the connecting layer 14 is shown. The detection beam 101 can also be transmitted by total reflection in the protective layer 11, or by total reflection in the protective layer 11, the connecting layer 14 and at least part of the display panel 12. This embodiment of the present application is not limited to this.

[0106] Optionally, the display device 10 includes a protective layer 11 located at the outermost layer, a display panel 12 located below the protective layer 11, and a backlight unit 13 located below the display panel 12. The backlight unit 13 provides visible light as a backlight beam, and the backlight beam can be emitted through the display panel 12 and the protective layer 11. The display panel 12 displays information visible to the human eye under the illumination of the backlight beam. The display panel 12 includes an array substrate 122 and a color filter substrate 124 that are arranged opposite to each other, and a liquid crystal layer 123 located between the array substrate 122 and the color filter substrate 124. The color filter substrate 124 is adjacent to the protective layer 11. The array substrate 122 is adjacent to the backlight unit 13. The array substrate 122 is located below the color filter substrate 124.

[0107] The array substrate 122 has a terminal area 1221 that extends beyond the color filter substrate 124. The display panel 12 further includes a flexible circuit board 15, one end of which is connected to the upper surface of the terminal area 1221 and is bent outward to extend below the backlight unit 13. The flexible circuit board 15 can be connected to an integrated circuit (IC), and the integrated circuit can drive and control the display panel 12 to display information through the flexible circuit board 15.

[0108] The backlight unit 13 includes a backlight film 131, a backlight lamp 132 and a backlight circuit board 133. The backlight film 131 is arranged below the display panel 12 relative to the display panel 12. The backlight lamp 132 is arranged beside the backlight film 131, and the backlight lamp 132 or at least a part thereof is approximately located below the terminal area 1221. The backlight lamp 132 can be an LED (light emitting diode). The number of the backlight lamps 132 can be one or more. The backlight circuit board 133 is connected to the backlight lamp 132 and is located below the backlight lamp 132, and is used to provide an electrical signal for driving the backlight lamp 132 to work, including but not limited to a voltage signal and a current signal. Optionally, the backlight film 131 can include but not limited to a light guide plate (not shown), a reflective sheet (not shown) located below the light guide plate, a diffuser (not shown) located above the light guide plate, and / or a brightness enhancement sheet (not shown). Optionally, the backlight unit 13 may further include a backlight frame (not shown) for accommodating and supporting the backlight film 131 and the backlight lamp 132. The backlight lamp 132 may include LED, Mini-LED, Micro-LED, OLED, or VCSEL. The backlight circuit board 133 may be a flexible circuit board. The backlight film 131 may transmit the detection light beam 101.

[0109] Optionally, in some embodiments, the display device 10 further includes a middle frame 17 for accommodating and supporting the protective layer 11 and the display module. The middle frame 17 is generally a frame structure having a bottom 171 and a side 172, and the side 172 extends vertically upward along the edge of the bottom 171 to the protective layer 11. Part or all of the bottom 171 is located below the backlight unit 13. The side 172 is located outside the side of the display panel 12 and the backlight unit 13. The middle frame 17 is made of, for example but not limited to, metal material, plastic, etc.

[0110] Optionally, the emission module 16 is arranged on the inner wall of the side portion 172 opposite to the display panel 12 or the connection layer 14. Further, the optical detection device 1b has a top end and a bottom end arranged opposite to each other along the length axis. The emission module 16 is arranged on the inner wall of the side portion 172 located at the bottom end of the optical detection device 1b, and the emission module 16 is located below the non-transparent area of ​​the protective layer 11.

[0111] Optionally, the orthographic projection of the emission module 16 on the first surface 111 and the orthographic projection of the display panel 12 on the first surface 111 do not overlap or partially overlap.

[0112] Optionally, the emission module 16 can be fixedly connected or detachably connected to a preset position of the inner wall of the side portion 172 by various means such as glue, double-sided tape, adhesive, bolts, brackets, buckles, slots, welding, etc. Optionally, the preset position of the inner wall can be a position facing or near the side 129 of the display panel 12 and the side 149 of the connecting layer 14. Optionally, the emission module 16 has a light emitting surface for emitting the detection light beam 101, and the light emitting surface of the emission module 16 faces or faces the side 129 of the display panel 12 and / or the side 149 of the protective layer 14, so that the detection light beam 101 can enter the display panel 12 from the side 129, or enter the connecting layer 14 from the side 149.

[0113] Optionally, at least part of the detection module 19 is located below the backlight unit 13. At least part of the detection module 19 is located above the bottom 171; or the bottom 171 has an opening corresponding to the detection module 19, and at least part of the detection module 19 is located in the opening of the bottom 171.

[0114] See also Figures 10A-10C ,yes Figure 8 Schematic diagram of top view of different modified embodiments of the optical detection device 1b along the thickness axis downward direction (opposite direction of the Z axis arrow). The emission module 16 may include one or more light emitting units 161, and the light emitting units 161 may have different numbers and positions. Fig. 10A As shown, the emission module 16 includes at least one light emitting unit 161 located on the central axis 103 and disposed near the bottom end 130 of the optical display device 1b. Fig. 10B As shown, the emission module 16 includes three light emitting units 161 symmetrically about the central axis 103 and located at the bottom end 130 of the optical detection device 1b. Fig. 10C As shown, the emission module 16 includes 4 light-emitting units 161 symmetrical about the central axis 103, and is divided into two groups according to 2 light-emitting units 161 as a group. The two groups of light-emitting units 161 are symmetrically distributed on both sides of the central axis 103, and the 2 light-emitting units 161 in each group are arranged in a row along the width axis direction of the optical detection device 1b. Alternatively, the emission module 16 includes 3 groups of light-emitting units, each group of light-emitting units includes 2 light-emitting units 161, and the 3 groups of light-emitting units are symmetrical about the central axis. Of course, in other or modified embodiments, the light-emitting units 161 of the emission module 16 can have different numbers and positions, and the embodiments of the present application are not limited to this.

[0115] Optionally, in an embodiment of the present application, the light-emitting unit 161 may be 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), and QLED (quantum dot light emitting diode).

[0116] Optionally, the light emitting unit 161 may be a top-emitting or side-emitting light emitting element. The light emitting unit 161 has a light emitting surface (not numbered) for emitting the detection light beam 101 , and the light emitting surface is arranged parallel, inclined, or perpendicular to the first surface 111 .

[0117] The detection module 19 has a field of view area V1 on the first surface 111 of the protective layer 11. The external object 1000 is a finger, and in the portion where the first surface 111 is not in direct contact with the surface of the finger, such as: the area where the first surface 111 is not touched by the finger or the area directly opposite to the valley of the fingerprint, the detection light beam 101 is totally reflected and continues to propagate. In the portion where the first surface 111 is in contact with the surface of the finger, such as: the position where the first surface 111 is in contact with the ridge of the fingerprint, the detection light beam 101 is diffusely reflected, and at least part of the diffusely reflected detection light beam 101 is received by the detection module 19 through the protective layer 11, the display panel 12, and the backlight unit 13 and converted into an electrical signal. Optionally, in some embodiments, the bottom 171 of the middle frame 17 has an opening corresponding to the detection module 19, and the detection module 19 is at least partially located in the opening, and the detection module 19 can be fixedly connected to the middle frame 17 through the opening.

[0118] The optical detection device 1b uses the display panel 12 or the connection layer 14 as the transmission medium of the detection light beam 11. The detection light beam 101 can be directly irradiated or fully reflected and transmitted to the field of view area V1 of the first surface 111 of the detection module 19. The detection light beam 11 continues to fully reflect at the position of the first surface 111 opposite to the valley of the fingerprint, and is emitted by diffuse reflection at the contact point between the first surface 111 and the ridge of the fingerprint. The detection module 19 receives the diffusely reflected detection light beam 11 for imaging. Since the characteristic of the diffusely reflected light beam is to diverge in all directions in space, the detection module 19 can be roughly set at a position directly below the field of view area V1 to receive the diffusely reflected detection light beam 11. It 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.

[0119] See also Fig.11 , is a partial top view schematic diagram of an optical detection device 1c according to an embodiment of the present application. Figure 12 to Figure 14 , Fig.12 yes Fig.11 A partial cross-sectional schematic diagram of the optical detection device 1c along line BB, Fig.13 is an enlarged schematic diagram of the area M1c in FIG. 12 , Fig.14 yes Fig.11 The schematic diagram of a partial cross section of the optical detection device 1c along the CC line, wherein the BB line is parallel to the length axis (Y axis) of the optical detection device 1c, and the CC line is parallel to the width axis (X axis) of the optical detection device 1c.

[0120] The optical detection device 1c and the optical detection device 1b have basically the same structure. For the convenience of description, the component numbers of the optical detection device 1c and the optical detection device 1b are kept consistent. Those skilled in the art can understand that the same number can represent the same component, and can also represent similar components that can be changed, replaced, expanded, and combined. The optical detection device 1c includes a display device 10, an emission module 16, and a detection module 19. The display device 10 includes a protective layer 11 located at the outermost layer of the optical detection device 1c, a display panel 12 located below the protective layer 11, a connecting layer 14 located between the protective layer 11 and the display panel 12, a backlight unit 13 located below the display panel 12, and a middle frame 17 for accommodating and supporting the protective layer 11, the display panel 12, and the backlight unit 13.

[0121] Optionally, the backlight unit 13 includes a backlight film material 131, a backlight lamp 132 and a backlight circuit board 133. The display panel 12 includes an array substrate 122, a liquid crystal layer 123 and a color filter substrate 124. The array substrate 122 is adjacent to the backlight unit 13, the color filter substrate 124 is adjacent to the protective layer 11, and the liquid crystal layer 123 is located between the array substrate 122 and the color filter substrate 124. The display panel 12 is a liquid crystal display panel. The backlight lamp 132 is used to provide visible light, and the backlight film material 131 is used to provide the visible light provided by the backlight lamp 132 to the display panel 12 in a uniform and surface-emitting manner. The backlight circuit board 133 is electrically connected to the backlight lamp 132, and is used to provide electrical signals to the backlight lamp 132, including but not limited to voltage signals and current signals.

[0122] like Fig.11As shown, the display panel 12 has a notch 1202 at the corner near the bottom end of the optical detection device 1c. It can be understood that the display panel 12 can be regarded as a rectangular flat plate with a triangular cross-section portion removed at the corner, and the notch 1202 corresponds to the removed portion of the display panel 12. For ease of description, the shape of the cross-section of the portion of the display panel 12 removed at the corner can be defined as the shape of the notch 1202 in the top view along the Z axis downward, referred to as the shape of the notch 1202. Optionally, in some embodiments, the backlight film 131 can have a shape substantially consistent with the display panel 12 in the top view direction along the Z axis downward.

[0123] Fig.11 1 shows that at two opposite corners of the optical detection device 1c along the width axis, the display panel 12 has a notch 1202. Optionally, in other or modified embodiments, the notch 1202 may be formed at only one corner.

[0124] Relative to the color filter substrate 124, the array substrate 122 has a terminal area 1221 that exceeds the color filter substrate 124. The backlight film material 131 faces the display panel 12. The backlight lamp 132 is located next to the backlight film material 131 and directly below the terminal area 1221. The number of the backlight lamp 132 can be one or more, and the multiple backlight lamps 132 are arranged in a row along a direction parallel to the width axis. Since the display panel 12 has a notch 1202 at the corner, the terminal area 1221 has a corresponding notch portion at the notch 1202.

[0125] The backlight circuit board 133 is located below the backlight lamp 132. The backlight circuit board 133 has a long strip structure. The backlight circuit board 133 extends to one or both sides parallel to the width axis direction and exceeds the display panel 12. The portion of the backlight circuit board 133 that exceeds the display panel 12 is defined as the extension portion 1331 of the backlight circuit board 133. The extension portion 1331 is directly opposite to the notch 1202 formed at the hypotenuse 1201 of the display panel 12, so the upper part of the extension portion 1331 will not be blocked by the display panel 12. The emission module 16 includes one or more light-emitting units 161 for emitting the detection light beam 101. The light-emitting unit 161 is arranged on the upper surface or above the extension portion 1331 of the backlight circuit board 133. The display panel 12 does not block the light-emitting unit 161, or in other words, the orthographic projection of the light-emitting unit 161 on the first surface 111 and the orthographic projection of the display panel 12 on the first surface 111 do not overlap. Of course, in other or modified embodiments, the orthographic projection of the light emitting unit 161 on the first surface 111 and the orthographic projection of the display panel 12 on the first surface 111 may partially overlap.

[0126] Optionally, the emission module 16 also includes a supporting unit 162, and the light emitting unit 161 is arranged on the supporting unit 162. The supporting unit 162 is arranged on the extension portion 1331. The supporting unit 162 is used to raise and support the light emitting unit 161, so that the spacing distance between the light emitting unit 161 and the protective layer 11 is small. At the same time, the supporting unit 162 is used to make the light emitting unit 161 and the display panel 12 or the connecting layer 14 approximately at the same height. The light emitting unit 161 has a light emitting surface (unnumbered) facing the side 129 of the display panel 12 and / or the side 149 of the connecting layer 14, and the detection light beam 101 can directly enter the display panel 12 or the connecting layer 14 after being emitted from the light emitting surface of the light emitting unit 161.

[0127] Of course, in other or modified embodiments, the light emitting surface of the light emitting unit 161 can be toward the protective layer 11 and parallel to the first surface 111, or the light emitting surface of the light emitting unit 161 can be inclined or perpendicular to the first surface 111. It is only necessary to ensure that the detection light beam 101 can enter the display panel 12 and / or the connecting layer 14. The embodiments of the present application are not limited to this.

[0128] Optionally, the light emitting unit 161 is electrically connected to the backlight circuit board 133 through the supporting unit 162 , or the light emitting unit 161 is directly electrically connected to the backlight circuit board 133 without passing through the supporting unit 162 .

[0129] See also Fig.15 ,yes Fig.11 The optical detection device 1c is a partial top view of an optical detection device 1d of a modified embodiment. The optical detection device 1d has substantially the same structure as the optical detection device 1c, except that the display panel 12 has concave edges 1203 and 1204 at the corners near the bottom of the optical detection device 1c, and the display panel 12 forms a notch 1205 at the edges 1203 and 1204.

[0130] The gap 1205 and Fig.11 The middle notch 1202 has different shapes. Optionally, the edges 1203 and 1204 may be arcs, straight lines, wavy lines, etc. Optionally, at least parts of the edges 1203 and 1204 and the width axis of the relationship detection device 1d have different inclination angles, or the same inclination angles.

[0131] Optionally, in some embodiments, the notches 1202 and 1205 may have different shapes and sizes, and the top view projection area of ​​the notches 1202 and 1205 along the Z-axis direction may be slightly larger than, equal to, or slightly smaller than the top view projection area of ​​the light emitting surface of the light emitting unit 161 along the Z-axis direction. Optionally, in some embodiments, the light emitting surface of the light emitting unit 161 at least partially faces the notches 1202 and 1205 without being blocked by the display panel 12.

[0132] See also Fig.16 ,yes Fig.11 The shown is a partial top view schematic diagram of an optical detection device 1e which is a modified embodiment of the optical detection device 1c. The structure of the optical detection device 1e is basically the same as that of the optical detection device 1c, except that the light emitting surface of the light emitting unit 161 is toward the field of view area V1, so that the detection light beam 101 can be transmitted to the field of view area V1 through total reflection with higher efficiency.

[0133] The optical detection devices 1c, 1d, and 1e of the embodiments of the present application have top and bottom ends relatively arranged along the length axis, and the notch formed at the corner of the display panel 12 near the bottom position is used to extend the backlight circuit board 133 along both sides of the width axis to the position opposite to the notch to form an extension portion 1331, and then a light-emitting unit 161 is arranged on the extension portion 1331, so that the detection light beam 101 emitted by the light-emitting unit 161 can directly irradiate into the display panel 12 and / or the connection layer 14 without being blocked by the terminal area 1221. The light-emitting unit 161 and the backlight 132 can use the backlight circuit board 133 together, and the backlight circuit board 133 can provide electrical signals for the light-emitting unit 161 and the backlight 132 respectively. In this way, there is no need to separately set a power supply or drive circuit board for the light-emitting unit 161, saving the internal space and components of the display device 10.

[0134] Furthermore, the emission module 16 may also be provided with a support unit 162. The support unit 162 is used to raise the light-emitting surface of the light-emitting unit 161, so that the spacing distance between the light-emitting unit 161 and the second surface 112 of the protective layer 11 may not be greater than the spacing distance between the terminal area 1221 and the second surface 112. In this way, the detection light beam 101 emitted by the light-emitting unit 161 can enter the display panel 12 and / or the connecting layer 14 more efficiently. Furthermore, the detection light beam 101 transmitted by total reflection in the protective layer 11, or in the protective layer 11 and the connecting layer 14, or in the protective layer 11, the connecting layer 14 and at least part of the display panel 12 is used to perform biometric detection, and the detection light beam 101 diffusely reflected at the contact point between the external object 1000 and the first surface 111 has a better biometric detection effect.

[0135] See also Fig.17 , the optical detection device 1f is Figure 8 A modified embodiment of the optical detection device 1b shown, Fig.17 A partial cross-sectional schematic diagram of the optical detection device 1f is shown. The structure of the optical detection device 1f is basically the same as that of the optical detection device 1b, except that the emission module 16 is arranged above the terminal area 1221. Optionally, along the width axis direction, the emission module 16 is located in the middle part, or both sides, or the middle and both sides of the terminal area 1221. Optionally, the flexible circuit board 15 is protected from air at the location of the emission module 16. For further information, please also refer to Fig.18 ,yes Fig.17 Partial three-dimensional schematic diagram of the optical detection device 1f in FIG. Among them, the emission module 16 includes a light-emitting unit 161 for emitting a detection light beam 101, and the light-emitting unit 161 is located on the terminal area 1221 of the display panel 12. The flexible circuit board 15 is partially connected to the terminal area 1221 and bends outward to extend to the bottom of the backlight unit 13. The flexible circuit board 15 has an air avoidance area 151, at least part of which is directly opposite to the terminal area 1221, and the light-emitting unit 161 can be at least partially located in the air avoidance area 151. Of course, in other or modified embodiments, the light-emitting unit 161 can have different settings, for example but not limited to, the light-emitting unit 161 can be set at a part of the terminal area 1221 that is not connected to the flexible circuit board 15. Since the light-emitting unit 161 is directly set on the terminal area 1221, it is close to the side of the display panel 12 or the connecting layer 14, and the detection light beam 101 emitted by it can enter the display panel 12 or the connecting layer 14 efficiently.

[0136] In an embodiment of the present application, the detection light beam 101 emitted by the emission module 16 or the light-emitting unit 161 and the detection light beam 101 entering the display panel 12 and / or the connection layer 14 are non-collimated light beams or non-parallel light beams. The non-collimated light detection light beam 101 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. In addition, the detection light beam 101 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 beam 101 is near-infrared light with a wavelength of 800nm ​​to 1200nm.

[0137] It is understandable that, although for illustrative purposes, the context of this application is generally described using fingerprints as an example, the embodiments and modified embodiments of the present application are not limited to the detection of fingerprints, and the detection object of the optical detection device 1 can be any object to be imaged. Generally, the detection object will have various characteristics including biometrics. It should be noted that, as an example, the optical detection device 1 of the present invention is described using finger fingerprints as the detection object, and it is understandable that the lines of the palm, toes, palm prints, skin surface textures, etc. can also be used as the detection object of the present invention or the characteristics of the external object to be detected.

[0138] It should be noted that the attached drawings of the present invention are only exemplary representations. In fact, the size of the ridges and valleys of the fingerprint is very small (about 300 microns to 500 microns), and the fingerprint range that needs to be detected during fingerprint detection (corresponding to the field of view area V1) is about 4 mm * 4 mm to 10 mm * 10 mm, or a larger range. The detection module 19 described in the embodiment of the present application receives the detection light beam 101 diffusely reflected at the ridge and is used for fingerprint optical imaging. However, the present invention is not limited to this, and the detection module 19 can receive other light beams with fingerprint feature information for imaging or detection. For example, but not limited to, the detection module 19 can receive the detection light beam 101 directly reflected from the surface of the user's finger (including the ridges and / or valleys of the fingerprint) and use it for fingerprint detection; for example, but not limited to, the detection module 19 can receive the visible light and / or invisible light in the external environment reflected by the user's finger and use it for fingerprint detection; for example, but not limited to, the detection module 19 can receive the visible light and / or invisible light in the external environment transmitted by the user's finger and use it for fingerprint detection; for example, but not limited to, the detection module 19 can receive the visible light and / or invisible light emitted by the user's finger and use it for fingerprint detection. Further, the above-mentioned fingerprint detection can also be detection of other detection objects, and any detection object that can obtain characteristic information by optical imaging is acceptable. Therefore, although the embodiment of the present invention is described by taking the reception of the diffusely reflected detection light beam 101 as an example, other possible light beams used for fingerprint optical imaging also fall within the protection scope of the present invention.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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 optical detection device, characterized in that: include: A display device comprising: A protective layer comprising a first surface and a second surface disposed opposite to each other; and A display module, located on one side of the second surface of the protective layer, capable of displaying information; an emission module, located on one side of the second surface of the protective layer, for emitting a detection light beam, wherein the detection light beam can enter the protective layer via the display module and be transmitted by total reflection at least within the protective layer; and The detection module is located on the second surface side of the protective layer. The detection module has a field of view area on the first surface of the protective layer. When the emission module emits a detection light beam to detect an external object in contact with the field of view area, the detection light beam is diffusely reflected at a position where the external object contacts the field of view area. At least part of the diffusely reflected detection light beam passes through the protective layer and at least part of the display module is received by the detection module. The detection module converts the received detection light beam into a corresponding electrical signal to obtain biometric information of the external object.

2. The optical detection device according to claim 1, characterized in that: The display module comprises: A display panel is located on the second surface side of the protective layer; A connecting layer, located between the protective layer and the display panel, and used to connect the protective layer and the display panel; A backlight unit is located below the display panel. The backlight unit provides visible light. The visible light can pass through the display panel and the protective layer. The display panel displays information using the visible light.

3. The optical detection device according to claim 2, characterized in that: The detection beam enters the protective layer from the connecting layer, and the detection beam can be transmitted by total reflection in the protective layer, or the detection beam can be transmitted by total reflection in the protective layer and the connecting layer, or the detection beam can be transmitted by total reflection in the protective layer, the connecting layer and at least part of the display panel.

4. The optical detection device according to claim 3, characterized in that: The connecting layer has an upper surface facing the protective layer, a lower surface facing the display panel, and a side surface connecting the upper surface and the lower surface, and the detection light beam enters the connecting layer from at least part of the side surface of the connecting layer, and then enters the protective layer from the connecting layer; wherein, the detection light beam is totally reflected and transmitted in the protective layer, including: the detection light beam is totally reflected and transmitted between the first surface and the second surface of the protective layer; the detection light beam is totally reflected and transmitted in the protective layer and the connecting layer, including: the detection light beam is totally reflected and transmitted between the first surface of the protective layer and the lower surface of the connecting layer.

5. The optical detection device according to claim 2, characterized in that: The detection beam enters the protective layer from the display panel via the connecting layer, and the detection beam can be transmitted by total reflection in the protective layer, or the detection beam can be transmitted by total reflection in the protective layer and the connecting layer, or the detection beam can be transmitted by total reflection in the protective layer, the connecting layer and at least part of the display panel.

6. The optical detection device according to claim 5, characterized in that: The connection layer has an upper surface facing the protective layer and a lower surface facing the display panel. The display panel includes an array substrate, a liquid crystal layer and a color filter substrate stacked in sequence from bottom to top. The color filter substrate is adjacent to the connection layer. The liquid crystal layer is sealed between the color filter substrate and the array substrate. The array substrate is adjacent to the backlight unit. The array substrate, the liquid crystal layer and the color filter substrate respectively have an upper surface, a lower surface and a side surface connecting the upper surface and the lower surface. The detection light beam can enter the display panel from one or more sides of the array substrate, the liquid crystal layer and the color filter substrate, and enter the protective layer via the connection layer after being emitted from the display panel. The detection light beam is fully reflected and transmitted in the protective layer, including: the detection light beam is fully reflected and transmitted between the first surface and the second surface of the protective layer. The detection light beam is fully reflected and transmitted in the protective layer and the connection layer, including: the detection light beam is fully reflected and transmitted between the first surface of the protective layer and the lower surface of the connection layer. The detection light beam is totally reflected and transmitted within the protective layer, the connecting layer and at least part of the display panel, including: the detection light beam can be totally reflected and transmitted between the first surface of the protective layer and the lower surface of the color film substrate, or the detection light beam can be totally reflected and transmitted between the first surface of the protective layer and the lower surface of the liquid crystal layer, or the detection light beam can be totally reflected and transmitted between the first surface of the protective layer and the lower surface of the array substrate.

7. The optical detection device according to claim 2, characterized in that: The protective layer includes a transparent area and a non-transparent area located around or at the edge of the transparent area, the transparent area is used to transmit visible light and a detection beam, and the non-transparent area is used to block visible light and transmit the detection beam, the emission module is located below the non-transparent area of ​​the protective layer, and at least a portion of the detection module is located below the transparent area.

8. The optical detection device according to claim 2, characterized in that: The orthographic projection of the emission module on the first surface and the orthographic projection of the display panel on the first surface do not overlap or partially overlap.

9. The optical detection device according to claim 2, characterized in that: The display device also includes a middle frame for accommodating the display module and the protective layer, the middle frame having a frame structure with a bottom and a side, the side extending vertically upward along the edge of the bottom to the protective layer, the bottom being located below the backlight unit, and the side being located outside the display panel and the backlight unit.

10. The optical detection device according to claim 9, characterized in that: The optical detection device has a length axis and a width axis that are perpendicular to each other. The optical detection device includes a top end and a bottom end that are relatively arranged along the length axis. The emission module is arranged at the bottom end and is located on the inner wall of the side of the middle frame.

11. The optical detection device according to claim 9, characterized in that: The bottom of the middle frame has an opening corresponding to the detection module, and at least a portion of the detection module is located in the opening.

12. The optical detection device according to claim 2, characterized in that: The emission module has a light emitting surface for emitting the detection light beam, the light emitting surface faces the side of the display panel and / or the connecting layer and is spaced apart from the side of the display panel, and the detection light beam is directly projected onto the side of the display panel and / or the connecting layer.

13. The optical detection device according to claim 2, characterized in that: The protective layer, the connecting layer, and the display panel together constitute a light guiding unit, the side surface of the connecting layer and the side surface of the display panel together constitute a light entrance area, the detection light beam emitted by the transmitting module enters the light guiding unit from the light entrance area, and can be transmitted by total reflection in at least part of the light guiding unit.

14. The optical detection device according to claim 1, characterized in that: When an external object contacts the field of view area, the emission module emits a detection light beam, which can enter the protective layer through the display module. The detection light beam entering the protective layer can be totally reflected in the field of view area.

15. The optical detection device according to claim 1, characterized in that: The optical detection device has a length axis and a width axis that are perpendicular to each other. The optical detection device includes a top end and a bottom end that are relatively arranged along the length axis. The emission module is located at the bottom end of the optical detection device.

16. The optical detection device according to claim 1, characterized in that: The emission module includes three light-emitting units for emitting detection light beams, the light-emitting units are arranged near the bottom end of the optical detection device and are symmetrically distributed about a central axis, and the central axis is a straight line parallel to the length axis of the optical detection device; or the emission module includes four light-emitting units symmetrical about the central axis, which are divided into two groups with two light-emitting units as a group, and the two groups of light-emitting units are symmetrically distributed on both sides of the central axis, and the two light-emitting units in each group are arranged in a row along the width axis direction of the optical detection device; or the emission module includes three groups of light-emitting units, each group of light-emitting units includes two light-emitting units, and the three groups of light-emitting units are symmetrical about the central axis.

17. The optical detection device according to claim 1, characterized in that: The emission module includes a light-emitting unit for emitting a detection light beam, wherein the light-emitting unit is a top-emitting or side-emitting light-emitting element, and the light-emitting unit has a light-emitting surface, which is used to emit the detection light beam, and the light-emitting surface is arranged parallel, inclined or vertically relative to the first surface.

18. The optical detection device according to claim 2, characterized in that: The detection module is located below the backlight unit.

19. The optical detection device according to claim 2, characterized in that: The optical detection device has a length axis and a width axis that are perpendicular to each other. The backlight unit includes a backlight film, a backlight lamp and a backlight circuit board. The backlight lamp is used to provide visible light. The backlight film is used to provide the visible light provided by the backlight lamp to the display panel in a uniform and surface-emitting manner. The backlight circuit board is electrically connected to the backlight lamp. The backlight circuit board is used to provide an electrical signal for the backlight lamp. The backlight circuit board extends outward at opposite ends or one end in a direction parallel to the width axis of the optical detection device and exceeds the display panel. The portion of the backlight circuit board that exceeds the display panel is defined as an extension portion. The emission module includes one or more light-emitting units for emitting a detection light beam, and the light-emitting unit is arranged on the upper surface or above the extension portion.

20. The optical detection device according to claim 19, characterized in that: The optical detection device includes a top end and a bottom end that are relatively arranged along the length axis direction, the display panel has a notch at the corner near the bottom end of the optical detection device, the extension portion is opposite to the notch, and the orthographic projection of the light-emitting unit on the first surface and the orthographic projection of the display panel on the first surface do not overlap or partially overlap.

21. The optical detection device according to claim 19, characterized in that: The emission module also includes a support unit, the light emitting unit is arranged on the support unit, the support unit is arranged on the extension part, and the support unit is used to raise and support the light emitting unit so that the spacing distance between the light emitting unit and the protective layer becomes smaller.

22. The optical detection device according to claim 2, characterized in that: The display panel includes an array substrate and a color film substrate that are arranged opposite to each other, and a liquid crystal layer located between the array substrate and the color film substrate. The array substrate is adjacent to the backlight unit, the color film substrate is adjacent to the protective layer, the array substrate has a terminal area that exceeds the color film substrate, and the emission module is arranged above the terminal area.

23. The optical detection device according to claim 22, characterized in that: The display panel also includes a flexible circuit board, one end of which is connected to the upper surface of the terminal area and bends outward to extend to the bottom of the backlight unit, and the flexible circuit board has a clearing area corresponding to the position of the emission module; or the emission module includes a light-emitting unit for emitting a detection light beam, and the light-emitting unit is arranged in a portion of the terminal area that is not connected to the flexible circuit board.

24. The optical detection device according to claim 2, characterized in that: The connecting layer is optical glue.

25. The optical detection device according to claim 2, characterized in that: The backlight unit comprises a backlight film material, a backlight lamp and a backlight circuit board. The backlight film material comprises a light guide plate, a reflective sheet located below the light guide plate, a diffusion sheet and / or a brightness enhancement sheet located above the light guide plate.

26. The optical detection device according to claim 2, characterized in that: The display panel has a first light entrance area which is not parallel to the first surface, the connecting layer has a second light entrance area which is not parallel to the first surface, the optical detection device has a top end and a bottom end which are relatively arranged along the length axis, the protective layer includes a transparent area and a non-transparent area around the transparent area, the emission module is located at the bottom end of the optical detection device and below the non-transparent area of ​​the protective layer, the first light entrance area and / or the second light entrance area are adjacent to the emission module; or the first light entrance area and / or the second light entrance area are directly opposite to the emission module; or the first light entrance area is a partial side surface of the outer edge of the bottom end of the display panel facing the optical detection device, and the second light entrance area is a partial side surface of the outer edge of the bottom end of the connecting layer facing the optical detection device.

27. The optical detection device according to any one of claims 1 to 26, characterized in that: The detection light beam is near infrared light.

28. An electronic device, characterized in that: An optical detection device comprising any one of claims 1-27.

Images