CN111339821A

CN111339821A - Optical detection device and electronic equipment

Info

Publication number: CN111339821A
Application number: CN201911312833.0A
Authority: CN
Inventors: 林峰; 朱文龙
Original assignee: Shenzhen Fushi Technology Co Ltd
Current assignee: Shenzhen Fushi Technology Co Ltd
Priority date: 2019-12-18
Filing date: 2019-12-18
Publication date: 2020-06-26

Abstract

The application discloses optical detection device, including display device, emission module and detection module. The display device includes a protective layer including a first surface and a second surface disposed opposite to each other. The display module is located the below of protective layer, can be used for the display information. The transmitting module is located below the protective layer and used for transmitting the detection light beams, and the detection light beams can enter the protective layer through the display module and are transmitted in the protective layer at least through total reflection. The detection module is provided with a view field area on the first surface of the protection layer, when the emission module emits detection light beams to detect an external object in contact with the view field area, the detection light beams are subjected to diffuse reflection at the position where the external object is in contact with the view field area, at least part of the detection light beams subjected to diffuse reflection penetrate out of the protection layer and are received by the detection module through at least part of the display module, and the detection module converts the received detection light beams into corresponding electric signals to acquire biological characteristic information. The invention also discloses an electronic device.

Description

Optical detection device and electronic equipment

Technical Field

The application relates to the field of photoelectric technology, in particular to an optical detection device and electronic equipment capable of achieving biological feature detection under a screen.

Background

With the technical progress and the improvement of living standard of people, users demand more functions and fashionable appearance for electronic equipment such as mobile phones, tablet computers and cameras. At present, the development trend of electronic devices such as mobile phones and the like is to have higher screen occupation ratio and have functions of fingerprint detection and the like. In order to realize a full screen or a screen close to the full screen effect, the electronic equipment has a high screen occupation ratio, and a fingerprint detection technology under the screen is developed. In the prior art, some products adopt OLED display screens, visible light reflected by a finger is collected below the OLED display screens, and fingerprint detection is realized by utilizing fingerprint characteristic information carried by the visible light emitted by the OLED after being reflected on the finger. However, for non-self-luminous displays such as Liquid Crystal Displays (LCDs), etc., due to different screen structures and display principles, the LCDs generally need to use visible light provided by a backlight unit to realize display, and the visible light cannot well penetrate through the backlight unit, so that the method of reflecting the visible light adopted by the OLEDs cannot well realize detection of fingerprints or other biological features under the LCD screen.

Disclosure of Invention

In view of the above, the present application provides an optical detection apparatus and an electronic device that can solve or improve the problems of the prior art.

One aspect of the present invention provides an optical inspection apparatus comprising:

a display device, comprising:

the protective layer comprises a first surface and a second surface which are oppositely arranged; and

the display module is positioned on one side of the second surface of the protective layer and can be used for displaying information;

the transmitting module is positioned on one side of the second surface of the protective layer and used for transmitting a detection light beam, and the detection light beam can enter the protective layer through the display module and is transmitted in a total reflection manner at least in the protective layer; and

the detection module is positioned on one side of the second surface of the protection layer, the detection module is provided with a view field area on the first surface of the protection layer, when the emission module emits detection light beams to detect an external object in contact with the view field area, the detection light beams are subjected to diffuse reflection at the position where the external object is in contact with the view field area, at least part of the detection light beams subjected to diffuse reflection penetrates out of the protection layer and at least part of the display module is received by the detection module, and the detection module converts the received detection light beams into corresponding electric signals to acquire biological characteristic information of the external object.

In some embodiments, the display module comprises a display panel positioned on one side of the second surface of the protective layer; the connecting layer is positioned between the protective layer and the display panel and is used for connecting the protective layer and the display panel; and the backlight unit is positioned below the display panel and provides visible light which can penetrate through the display panel and the protective layer, and the display panel displays information by utilizing the visible light.

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

In some embodiments, the connection layer has an upper surface facing the protective layer, a lower surface facing the display panel, and a side surface connecting the upper and lower surfaces, and the detection beam enters the connection layer from at least a portion of the side surface of the connection layer and then enters the protective layer from the connection layer; wherein the detection beam is transmitted in a total reflection manner in the protective layer, and the detection beam comprises: the detection light beam is transmitted between the first surface and the second surface of the protective layer in a total reflection mode; the detection beam is transmitted in a total reflection mode in the protective layer and the connecting layer, and the detection beam comprises the following steps: the detection beam is transmitted between the first surface of the protective layer and the lower surface of the connecting layer in a total reflection mode.

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

In some embodiments, the connection layer has an upper surface facing the protection layer and a lower surface facing the display panel, the display panel includes an array substrate, a liquid crystal layer, and a color film substrate stacked in sequence from bottom to top, the color film substrate is adjacent to the connection layer, the liquid crystal layer is sealed between the color film substrate and the array substrate, the array substrate is adjacent to the backlight unit, the array substrate, the liquid crystal layer, and the color film substrate respectively have an upper surface, a lower surface, and side surfaces connecting the upper surface and the lower surface, and the detection light beam can enter the display panel from the side surface of one or more of the array substrate, the liquid crystal layer, and the color film substrate, and enter the protection layer through the connection layer after exiting from the display panel; wherein the detection beam is transmitted in a total reflection manner in the protective layer, and the detection beam comprises: the detection light beam is transmitted between the first surface and the second surface of the protective layer in a total reflection mode; the detection beam is transmitted in a total reflection mode in the protective layer and the connecting layer, and the detection beam comprises the following steps: the detection light beam is transmitted between the first surface of the protective layer and the lower surface of the connecting layer in a total reflection mode; the total reflection transmission of the detection beam in the protective layer, the connecting layer and at least part of the display panel comprises the following steps: the detection light beam can be transmitted between the first surface of the protective layer and the lower surface of the color film substrate in a total reflection manner, or the detection light beam can be transmitted between the first surface of the protective layer and the lower surface of the liquid crystal layer in a total reflection manner, or the detection light beam can be transmitted between the first surface of the protective layer and the lower surface of the array substrate in a total reflection manner.

In some embodiments, the detection module has a field area on the first surface, and when an external object contacts the field area, the emission module emits a detection beam, the detection beam can enter the protection layer through the display module, and the detection beam entering the protection layer can be totally reflected in the field area.

In some embodiments, the protection layer includes a transparent region and a non-transparent region located around or at an edge of the transparent region, the transparent region is configured to transmit visible light and the detection light beam, the non-transparent region is configured to block visible light and transmit the detection light beam, the emission module is located below the non-transparent region of the protection layer, and at least a portion of the detection module is located below the transparent region.

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 are not overlapped or partially overlapped.

In some embodiments, the optical detection device has a length axis and a width axis perpendicular to each other, the optical detection device includes a top end and a bottom end oppositely disposed along the length axis, and the emission module is located at the bottom end of the optical detection device.

In some embodiments, the display device further includes a middle frame for accommodating the display module and the protective layer, the middle frame has a frame structure with a bottom portion and a side portion, the side portion extends vertically upward to the protective layer along an edge of the bottom portion, the bottom portion is located below the backlight unit, and the side portion is located outside the display panel and the backlight unit.

In some embodiments, the optical detection device has a length axis and a width axis perpendicular to each other, the optical detection device includes a top end and a bottom end oppositely disposed along the length axis, and the emission module is disposed at the bottom end and located on an inner wall of a side portion of the middle frame.

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.

In some embodiments, the emission module has a light emitting surface for emitting the detection beam, the light emitting surface faces the side surface of the display panel and/or the connection layer and is spaced apart from the side surface of the display panel, and the detection beam is directly projected to the side surface of the display panel and/or the connection layer.

In some embodiments, the protective layer, the connection layer, and the display panel together form a light guide unit, a side surface of the connection layer and a side surface of the display panel together form a light incident region, and the detection light beam emitted by the emission module enters the light guide unit from the light incident region and can be transmitted in the light guide unit by total reflection.

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

In some embodiments, the emission module comprises 3 light emitting units for emitting detection beams, the light emitting units are disposed 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 comprises 4 light-emitting units which are symmetrical about the central axis, the 4 light-emitting units are divided into two groups according to 2 light-emitting units, the two groups of light-emitting units are symmetrically distributed on two sides of the central axis, and the 2 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 comprises 3 groups of light-emitting units, each group of light-emitting units comprises 2 light-emitting units, and the 3 groups of light-emitting units are symmetrical about the central axis.

In some embodiments, the emission module includes a light emitting unit for emitting the detection beam, the light emitting unit is a top emission type or a side emission type light emitting device, and the light emitting unit has a light emitting surface for emitting the detection beam, and the light emitting surface is parallel, inclined, or perpendicular to the first surface.

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

In some embodiments, the optical inspection device has a length axis and a width axis perpendicular to each other, the backlight unit includes a backlight film, a backlight, and a backlight circuit board, the backlight is used for providing visible light, the backlight film is used for providing the visible light provided by the backlight to the display panel in a uniform and surface-emitting manner, the backlight circuit board is electrically connected with the backlight lamp and is used for providing an electric signal for the backlight lamp, the opposite ends or one end of the backlight circuit board along the direction parallel to the width axis of the optical detection device extend outwards and exceed the display panel, and the part of the backlight circuit board exceeding the display panel is defined as an extension part, the emission module comprises one or more light-emitting units for emitting detection light beams, and the light-emitting units are arranged on or above the upper surface of the extension part.

In some embodiments, the optical detection device includes a top end and a bottom end which are oppositely arranged along the length axis direction, the display panel has a notch at a corner close to the bottom end of the optical detection device, the extension part faces 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.

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 for elevating and supporting the light emitting unit, so that a separation distance between the light emitting unit and the protective layer becomes smaller.

In some embodiments, the display panel includes an array substrate and a color filter substrate that are disposed opposite to each other, and a liquid crystal layer located between the array substrate and the color filter substrate, the array substrate is adjacent to the backlight unit, the color filter substrate is adjacent to the protective layer, the array substrate has a terminal area that exceeds the color filter substrate, and the emission module is disposed on the terminal area.

In some embodiments, the display panel further includes a flexible circuit board, one end of the flexible circuit board is connected to the upper surface of the terminal area and is bent outwards to extend to the lower side of the backlight unit, and the position of the flexible circuit board corresponding to the emission module is provided with a space avoiding area; or the light emitting unit is disposed at a portion of the terminal area not connected to the flexible circuit board.

In some embodiments, the connecting layer is an optical glue.

In some embodiments, the backlight unit includes a backlight film including a light guide plate, a reflective sheet below the light guide plate, a diffusion sheet above the light guide plate, and/or a brightness enhancement sheet, a backlight, and a backlight circuit board.

In some embodiments, the display panel has a first light-entering region non-parallel to the first surface, the connection layer has a second light-entering region non-parallel to the first surface, the optical detection device has a top end and a bottom end oppositely disposed along a length axis, the protection layer includes a transparent region and a non-transparent region located around the transparent region, the emission module is located at the bottom end of the optical detection device and below the non-transparent region of the protection layer, and the first light-entering region and/or the second light-entering region is adjacent to the emission module; or the first light-entering area and/or the second light-entering area are/is opposite to the emission module; or the first light-entering area is a part of the side surface of the display panel facing the outer edge of the bottom end of the optical detection device, and the second light-entering area is a part of the side surface of the connecting layer facing the outer edge of the bottom end of the optical detection device.

In some embodiments, the emission module includes a light emitting unit for emitting the detection beam, the light emitting unit is a top-emission or side-emission light emitting device, and the light emitting unit has a light emitting surface facing a side of the display module.

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

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

An aspect of the invention provides an electronic device comprising the optical detection apparatus of any one of the above.

The beneficial effects of this application lie in, the optical detection device that this application provided includes the transmission module, and the measuring beam that the transmission module transmitted passes through the display module and gets into the protective layer, measuring beam can be in at least total reflection transmission in the protective layer to outside object takes place the diffuse reflection with leaded light unit surface contact's position and returns the measuring module, thereby can realize detecting under the screen. The detection light beam can directly enter the display module and then enter the protective layer to be projected to the first surface of the protective layer, and total reflection is achieved without the help of other optical coupling elements. Moreover, the emitting module does not need to be tightly attached to the surface of the display module, and the detection light beams can enter the light guide unit from the air, so that the heat generated by the emitting module during working is less transferred to the surface of the light guide unit, and the problem that hands are scalded possibly due to long-time use is solved. Moreover, the transmitting module and the air between the display modules are also favorable for improving the heat dissipation efficiency of the transmitting module.

Drawings

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

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

FIG. 3 is a schematic view of one embodiment of an optical detection device of the present invention;

FIGS. 4-6 are schematic views of portions of the optical detection apparatus of FIG. 3;

FIG. 7 is a schematic cross-sectional view of a portion of the display device shown in FIG. 3;

FIG. 8 is a schematic view of one embodiment of an optical detection device of the present invention;

FIG. 9 is a schematic view of a portion of the area in FIG. 8;

FIGS. 10A-10C are schematic views of various alternative embodiments of the optical detection device of FIG. 8;

FIG. 11 is a schematic view of one embodiment of an optical detection device of the present invention;

FIG. 12 is a schematic partial cross-sectional view of the optical detection device of FIG. 11;

FIG. 13 is a schematic view of a portion of the area in FIG. 12;

FIG. 14 is a schematic partial cross-sectional view of the optical detection device of FIG. 11;

FIG. 15 is a schematic top view of a portion of a modified embodiment of the optical detection device of FIG. 11;

FIG. 16 is a schematic top view of a portion of a modified embodiment of the optical detection device of FIG. 11;

FIG. 17 is a schematic view of an alternate embodiment of the optical detection device of FIG. 8;

FIG. 18 is a partial perspective view of the optical detection device of FIG. 17.

Detailed Description

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

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

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

Referring to fig. 1 to 2 together, fig. 1 is a schematic top view of an optical detection apparatus 1 according to an embodiment of the present disclosure, and fig. 2 is a schematic partial cross-sectional view of the optical detection apparatus 1 along a line a-a in fig. 1. The optical detection device 10 is used to detect characteristics of an external object, such as a fingerprint on a user's finger. The optical detection device 10 is not limited to the detection of fingerprints, however, and the detection object of the optical detection device 10 may be any external object that can be imaged. In the present application, the optical detection device 10 is described by taking the example of detecting a finger fingerprint. It is understood that the skin surface texture of the palm, toes, and other parts may also be used as the feature of the detection object or the external object to be detected of the optical detection apparatus 10 of the present application. The optical detection device 1 is defined to have a length axis, a width axis and a thickness axis perpendicular to each other. As shown in fig. 1, 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. The X axis, the Y axis, the Z axis and the directions thereof are only defined for convenience of describing the positional relationship of the elements, and do not represent any limitation to the embodiments of the present application. The a-a line may be located on a central axis 103 of the optical detection apparatus 1 parallel to the length axis, or the a-a line may be located in the vicinity of the central axis 103. The central axis 103 is a straight line parallel to the longitudinal axis Y and is located at an intermediate position along the width axis X of the optical detection apparatus 1.

The optical detection device 1 comprises 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 positioned below the protective layer 11. The emission module 16 is located below the protection layer 11. The emission module 16 is used for emitting the detection beam 101. The detection beam 101 may enter the protection layer 11 through the display panel 12 and may be transmitted by total reflection within the protection layer 11.

The protective layer 11 includes a first surface 111 and a second surface 112 disposed oppositely, and the first surface 111 may be an outermost surface of the optical detection apparatus 1 or an electronic device including the optical detection apparatus 1. It is understood that the protective layer 11 may include a plastic film, a toughened film, or other films that are attached by a user during actual use, and the first surface 111 of the protective layer 11 is a surface that the external object 1000 directly contacts during biometric detection. The first surface 111 is the outermost of the optical detection apparatus 1, or the first surface 111 is the outermost of an electronic device comprising the optical detection apparatus 1. Here, for example, but not limiting of, the external object 1000 may be a finger and the biometric detection may be fingerprint feature detection.

Optionally, in some embodiments, the protective layer 11 includes a non-transparent region 110 and a transparent region 120 that are connected. The non-transparent region 110 is located at the periphery or edge of the transparent region 120. The transparent region 120 is configured to transmit visible light. The non-transparent area 110 is used for blocking visible light, so that the internal elements of the optical detection apparatus 1 are not visible to a user in the non-transparent area 110. In the embodiment of the present application, the transmittance of the non-transparent region 10 for the visible light beam is less than a preset threshold, for example: 10%, 5%, 1%, 0%. It is understood that the protection layer 11 can achieve the function of shielding visible light by disposing a light shielding film (not shown) in the non-transparent region 110 of the second surface 112. The light shielding film has a transmittance for the detection beam 11 larger than that for the visible beam. The transmittance of the non-transparent region 210 to the detection light beam 11 is greater than a preset value. The preset value is 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, or 90%. The light shielding film 222 is a single-layer structure or a multi-layer structure. The light-shielding film is, for example, an infrared-covering ink. However, the light shielding film may have other suitable structures, such as a multilayer structure, and can transmit the detection beam 101 and shield visible light.

Optionally, in some embodiments, the optical detection device 1 has a top end 140 and a bottom end 130 oppositely disposed along a length axis (Y-axis), and at least a portion of the non-transparent region 110 of the protective layer 11 is located at the bottom end 130 of the optical detection device 1. Alternatively, portions of the display panel 12 may be located within the bottom end 130.

The emission module 16 is located under the non-transparent region 110 and at the bottom end 130 of the optical detection apparatus 1. The detection module 19 is located below the transparent area 120 of the protection layer 11. The emitting module 16 is located at a middle position of the bottom end 130 along the width axis X direction, for example, but not limited to, the emitting module 16 and the projection of the central axis 103 along the Z direction on the first surface 111 intersect with each other. Of course, in other or modified embodiments, the emitting module 16 may be located at other positions of the bottom end 130, for example, but not limited to, the emitting module 16 may be located at one side or two sides of the central axis 103 of the optical detection apparatus 1. Optionally, the emission module 16 and the display panel 12 are disposed at an interval, and an orthogonal projection of the emission module 16 on the first surface 111 and an orthogonal 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.

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

The display panel 12 includes an upper surface (not numbered) facing the second surface 112, a lower surface (not numbered) opposite the upper surface, and a side surface 129 between the upper and lower surfaces. The detection beam 101 may enter the display panel 12 from the side surface 129, then the detection beam 101 may exit 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 may be transmitted by total reflection within the protective layer 11, that is, the detection beam 101 may be transmitted by total reflection between the first surface 111 and the second surface 112.

An area where the detection beam 101 first reaches the first surface 111 after entering the protection layer 11 is defined as a preset area P1. The portion of the first surface 111 located in the field angle range of the detection module 19 is defined as a field area V1. The field of view region V1 is also a sensing region of the biometric characteristic of the external object 1000, and the detection module 19 acquires the biometric characteristic information of the external object 1000 by capturing the detection light beam 101 returned by the external object 1000 from the field of view region V1. For convenience of description, the preset area P1 can also be regarded as an area directly irradiated by the detection beam 101 on the first surface 111.

The detection light beam 101 enters the protective layer 11 and then irradiates the predetermined area P1. Optionally, the preset region P1 and the field-of-view region V1 overlap, as shown in fig. 1 and fig. 2, the overlapping region is denoted by Q1, and the preset region P1 includes an overlapping region Q1 and an irradiation region that is closer to the emission module 16 than the overlapping region Q1. The area of the overlapping region 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 region V1. Accordingly, since there are enough detection light beams 101 directly irradiated within the field of view region V1, accordingly, enough detection light beams 101 in contact with the external object 1000 are ensured, and the detection accuracy of the biometric characteristic can be improved.

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

Alternatively, in some embodiments, there may be no overlap between the preset region P1 and the field of view region V1. The preset region P1 is adjacent to the emission module 16 than the field of view region V1. The detection light beam 101 irradiated to the preset area P1 by the emission module 16 is transmitted towards the field of view area V1 in a total reflection manner. In this case, since the detection beams 101 all reach the field of view region V1 indirectly through total reflection transmission, the side of the external object 1000 adjacent to the detection beam 101 interrupts the transmission of part of the detection beam 101, resulting in a smaller number of detection beams 101 reaching the surface of the external object 1000 facing the field of view region V1, which may affect the detection accuracy of the biometric characteristic.

Alternatively, in some embodiments, the external object 1000 may be a finger that includes a fingerprint made up of ridges and valleys. In order to capture fingerprint information of a finger, it is generally required that the finger contact the field of view region V1, the finger contact the field of view region V1 with ridges contacting the first surface 111 and valleys spaced from the first surface 111. When the emission module 16 emits the detection light beam 101 for detection, the detection light beam 101 may be diffusely reflected at the ridge of the finger, so that a portion of the detection light beam 101 can pass through the protection layer 11 and the display panel 12 to be received by the detection module 19. The optical detection device 1 can acquire fingerprint characteristic information and further realize fingerprint detection by emitting a detection light beam 101 to a finger and receiving the detection light beam 101 with fingerprint characteristic information returned by the finger.

Alternatively, the detection beam 101 entering the protective layer 11 may include: a detection light beam 101a directly irradiated to a contact place of the external object 1000 and the first surface 111 and subjected to diffuse reflection; the detection light beam 101b irradiates the contact position of the external object 1000 and the first surface 111 after being transmitted by total reflection and is subjected to diffuse reflection; and the detection light beam 101c which is not directly irradiated to the contact position of the external object 1000 and the first surface 111 or is not irradiated to the contact position of the external object 1000 and the first surface 111 after being transmitted by total reflection is kept in the protective layer 11.

Referring to fig. 3, a schematic diagram of an optical detection device 1a according to an embodiment of the present application, where 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 substantially the same structure, and for convenience of description, the element numbers of the optical detection device 1a and the optical detection device 1 are kept consistent, and those skilled in the art will understand that the same reference numbers may refer to the same elements, and may also refer to similar elements that may be modified, replaced, expanded, and combined. The optical detection device 1a is different from the optical detection device 1 in 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 the protective layer 11 and a display module (not numbered) located below the protective layer 11. The detection light beam 101 can enter the protection layer 11 through the display module, and is transmitted by total reflection at least in the protection layer 11.

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 protection layer 11 and the display panel 12, and is used for connecting the protection 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 configured to provide a backlight beam to the display panel 12, and the display panel 12 realizes image display under illumination of the backlight beam. The backlight beam is visible light.

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

Optionally, the detection beam 101 may enter the protection layer 11 through the display panel 12 and/or the connection layer 13, and may be transmitted by total reflection at least in the protection layer 11. For example, but not limiting of, the connecting layer 14 may include or be an optical glue or other transparent optical material.

Optionally, the detection beam 101 can exit 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. In particular, the detection beam 101 is capable of total reflection transmission between the first surface 111 and the lower surface of the connection layer 14.

Optionally, the connection layer 14 includes an upper surface facing the second surface, a lower surface facing the display panel, and a side 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, as shown in fig. 3, the connection layer 14 has a side surface 149 between the upper surface and the lower surface thereof, and the side surface 149 is adjacent to the emission module 16. The detection beam 101 emitted by the emission module 149 can enter the connection layer 14 from the side 149.

Optionally, in some embodiments, the upper surface and the lower surface of each of the connection layer 14 and the display panel 12 are parallel to the first surface 111. The side surface 129 connects the upper and lower surfaces of the connection layer 14, and the side surface 129 connects the upper and lower surfaces 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 a side surface 129 of the display panel 12. At least a portion of the side surface 129 of the display panel 12 is defined as a first light-in area, and at least a portion of the side surface 149 of the connection layer 14 is defined as a second light-in area. The optical detection device 1a has a top end and a bottom end which are oppositely disposed along a length axis.

The emission module 16 is located at the bottom end of the optical detection device 1a and below the non-transparent region 110 of the protection layer 11. The first light incoming region and/or the second light incoming region are/is adjacent to the emission module 16; or, the first light-entering area and/or the second light-entering area are opposite to at least part of the emission module 16; alternatively, the first light-entering region is a partial side surface 129 of the display panel 12 facing the outer edge of the bottom end of the optical detection apparatus 1a, and the second light-entering region is a partial side surface 149 of the connection layer 14 facing the outer edge of the bottom end of the optical detection apparatus 1 a.

Optionally, the display panel 12 and the connection layer 14 are capable of transmitting the detection beam 101. The detection beam 101 can be emitted from the emission module 16, 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 protection 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 beam 101 can be transmitted by total reflection between the first surface 111 and the lower surface of the connection layer 14.

Optionally, the detection beam 101 can enter the connection layer 14 or the display panel 12, and further be transmitted by total reflection in the protection layer 11, the connection layer 14, and the display panel 12. Specifically, the detection beam 101 can enter the display device 10 from the connection layer 14 or the display panel 12, and is transmitted by total reflection between the first surface 111 and the lower surface of the display panel 12.

The thickness of the display panel 12 is typically small compared to the length and width of the display panel 12, such as, but not limited to: the width of the display panel 12 may be 70 mm, the length may be 150 mm, and the thickness may be 2 mm. The light emitting surface of the emitting module 16 and the display panel 12 have a certain interval. The detection beam 101 enters from the side surface 129 of the display panel 12 and can be irradiated to the upper surface of the display panel 12 at a large incident angle.

Optionally, the upper surface of the display panel 12 is attached to the lower surface 112 of the protection layer 11 through the connection layer 14. For example, but not limited to, the display panel 12 and the protective layer 11 may be attached by the connection layer 14 or a frame.

Further alternatively, the protective layer 11 may include or be a transparent material, and a portion facing and attached to the display panel 12 may be regarded as having a uniform refractive index.

Alternatively, the display panel 12 may have a multi-layer structure. The refractive indices of different layers or different portions of the display panel 12 may have differences. The refractive index of the part, just opposite to and attached to the display panel 12 and the protective layer 11 is smaller than that of the connecting layer 14, and the refractive index of the connecting layer 14 is smaller than that of the protective layer 11. After the detection beam 101 enters the protection layer 11, an incident angle of the detection beam 101 on the first surface 111 of the protection layer 11 may be not less than a critical angle of total reflection between the protection layer 11 and air, and the portion of the detection beam 101 can be totally reflected on the first surface 111 of the protection layer 11. After the detection beam 101 enters the connection layer 14, an incident angle of the detection beam 101 between the lower surface of the connection layer 14 and the upper surface of the display panel 12 may be not less than a critical angle of total reflection between the display panel 12 and the connection layer 14, and the part of the detection beam 101 can propagate in total reflection between the lower surface of the connection layer 14 and the first surface 111 of the protection layer 11.

Alternatively, in some embodiments, the protective layer 11 may comprise or be made of a transparent material, which may have a refractive index of, 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 connection layer 14 and the protective layer 11 may be the same, or the refractive index of the connection layer 14 is slightly larger than the protective layer 11.

Referring to fig. 4, which is a partial schematic view of the optical detection apparatus 1a in fig. 3, fig. 4 shows that the detection beam 101 can enter the display panel 12 from the side surface 129 of the display panel 12 and be transmitted by total reflection in the protection layer 11, the connection layer 14, and the display panel 12.

Referring to fig. 5, which is a partial schematic view of the optical detection apparatus 1a in fig. 3, fig. 5 shows that the detection beam 101 can enter the display panel 12 from the side 149 of the connection layer 14 and be transmitted by total reflection in the protection layer 11 and the connection layer 14.

Referring to fig. 6, which is a partial schematic view of the optical detection apparatus 1a in fig. 3, fig. 6 shows that the detection beam 101 can enter the display panel 12 from the side 149 of the connection layer 14 and be transmitted by total reflection in the protection layer 11, the connection layer 14, and the display panel 12.

Please refer to fig. 7, which is a cross-sectional view of a portion of the display device 10 shown in fig. 3. 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 sequentially arranged 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 is capable of transmitting the detection beam 101.

The detection beam 101 can enter the display device 10 from a side surface 149 (see fig. 3) of the connection layer 14, or the detection beam 101 can enter the display panel 12 from a side surface 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 is capable of one or more of the following total reflection transmissions:

a part of the detection beam 101 may be transmitted by total reflection within the protective layer 11; or a part of the detection beam 101 may be transmitted by total reflection within the protective layer 11 and the connection layer 14; or a part of the detection beam 101 may be totally reflected and transmitted within the protective layer 11, the connecting layer 14, the upper polarizer 125; or a part of the detection beam 101 may be transmitted by total reflection in the protective layer 11, the connection layer 14, the upper polarizer 125, and the color film substrate 124; or a part of the detection beam 101 may be transmitted by total reflection in the protective layer 11, the connection layer 14, the upper polarizer 125, the color filter substrate 124, and the liquid crystal layer 123; or a part of the detection beam 101 may be transmitted by total reflection in the protective layer 11, the connection layer 14, the upper polarizer 125, the color filter substrate 124, the liquid crystal layer 123, and the array substrate 122; or a part of the detection beam 101 may be transmitted by total reflection in the protective layer 11, the connection 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 part of the detection beam 101 may be transmitted by total reflection in the protective layer 11, the connection 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 a part of the backlight unit 13.

Here, an area where the detection 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 located in the field angle range of the detection module 19 is defined as a field area V1. The field of view region V1 is also a sensing region of the biometric characteristic of the external object 1000, and the detection module 19 acquires the biometric characteristic information of the external object 1000 by capturing the detection light beam 101 returned by the external object 1000 from the field of view region V1. For convenience of description, the preset area P1 can also be regarded as an area directly irradiated by the detection beam 101 on the first surface 111.

The detection light beam 101 enters the protective layer 11 and then irradiates the predetermined area P1. Optionally, the preset region P1 and the field-of-view region V1 overlap, as shown in fig. 3, the overlapping region is denoted by Q1, and the preset region P1 includes an overlapping region Q1 and an irradiation region that is closer to the emission module 16 than the overlapping region Q1. The area of the overlapping region 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 region V1. Accordingly, since there are enough detection light beams 101 directly irradiated within the field of view region V1, accordingly, enough detection light beams 101 in contact with the external object 1000 are ensured, and the detection accuracy of the biometric characteristic can be improved.

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

Some or all of the detection beam 101 may be transmitted by total reflection within the protective layer 11. The detection beam 101 is totally reflected at the portion of the first surface 111 not in direct contact with the finger surface. The detection light beam 101 is diffusely reflected at the ridge of the fingerprint in contact with the field of view region V1. At least part of the detection light beam 101 subjected to diffuse reflection passes through the protective layer 11 (appearing for the first time in the specification) and is received by the detection module 19, and the detection module 19 converts the received detection light beam 101 into a corresponding electric signal to obtain fingerprint information.

By receiving the diffusely reflected detection light beam 101, the detection module 19 can acquire corresponding fingerprint information, such as, but not limited to, optical image information corresponding to a fingerprint. Because the detection light beam 101 is only diffusely reflected at the contact position of the first surface 111 and the ridge, and is totally reflected at the position of the first surface 111 opposite to the valley, the fingerprint information collected by the detection module 19 can have better contrast, and therefore, the fingerprint characteristic information identification method has higher accuracy and efficiency.

Optionally, in some embodiments, the protective layer 11, the connection layer 14, and the display panel 12 together form a light guide unit, and the side 149 of the connection layer 14 and the side 129 of the display panel 12 together form a light incident region. The emitting module 16 emits a detection light beam 101, the detection light beam 101 enters the light guide unit through the light entering region, and can be transmitted in a total reflection manner 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 incident area and can be transmitted in a total reflection mode in at least part of the light guide unit. The optical detection device 1a can propagate the detection light beam 101 to the position where the external object 1000 contacts the first surface 111 through the light guide unit by total reflection, so that the detection light beam 101 is reflected diffusely at the contact position and returns to the detection module 19, thereby realizing the under-screen detection. The detection light beam 101 can directly enter the light guide unit through the light entrance area to realize total reflection propagation, and does not need to enter the light guide unit through an additional optical coupling element to realize total reflection. The detection light beam 101 can enter the light guide unit from the air, the emission module 16 does not need to be attached to the surface of the light guide unit, and the emission module 16 can be arranged at a distance from the light entering region or the light guide unit. Therefore, the heat generated by the emission module 16 during operation is less transferred to the light guide unit and the first surface 111, thereby solving the problem of scalding hands which may be generated during long-term use. Moreover, the arrangement of the air space between the emission module 16 and the light guide unit is also beneficial to improving the heat dissipation efficiency of the emission module 16.

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

Referring to fig. 8 and 9, fig. 8 is a schematic diagram of an optical detection apparatus 1b according to an embodiment of the present application, wherein fig. 9 is an enlarged schematic diagram of a region M1b in fig. 8. For convenience of description, the reference numbers of the elements of the optical detection device 1b and the optical detection device 1a are the same, and those skilled in the art will understand that the same reference numbers may represent the same elements, and may also represent similar elements that can be modified, replaced, expanded, and combined. The optical detection device 1b comprises 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 beam 101. The detection 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 beam 101 into an electrical signal, and acquires biometric information of the external object 1000 from the electrical signal.

It should be noted that fig. 8 shows the optical path of the detection beam 101 that is transmitted by total reflection between the protection layer 11 and the connection layer 14, and the detection beam 101 may also be transmitted by total reflection in the protection layer 11, or in the protection layer 11, the connection layer 14 and at least a part of the display panel 12. The embodiments of the present application do not limit this.

Alternatively, the display device 10 includes a protective layer 11 positioned at the outermost layer, a display panel 12 positioned below the protective layer 11, and a backlight unit 13 positioned below the display panel 12. The backlight unit 13 supplies visible light as a backlight beam that can exit through the display panel 12 and the protective layer 11. The display panel 12 displays information visible to the human eye under illumination by a backlight beam. The display panel 12 includes an array substrate 122 and a color filter substrate 124 which are oppositely disposed, and a liquid crystal layer 123 located between the array substrate 122 and the color filter substrate 124. The color film 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 film substrate 124.

The array substrate 122 has a terminal area 1221 extending beyond the color filter substrate 124. The display panel 12 further includes a flexible circuit board 15, and one end of the flexible circuit board 15 is connected to the upper surface of the terminal area 1221 and bends outward to extend to the lower side of the backlight unit 13. The flexible circuit board 15 may be connected to an Integrated Circuit (IC), and the IC may drive and control the display panel 12 through the flexible circuit board 15 to display information.

The backlight unit 13 includes a backlight film 131, a backlight 132, and a backlight circuit board 133. The backlight film 131 is disposed below the display panel 12 with respect to the display panel 12. The backlight 132 is disposed beside the backlight film 131, and the backlight 132 or at least a part thereof is substantially located below the terminal area 1221. The backlight 132 may be an LED (light emitting diode). The number of the backlight lamps 132 may be one or more. The backlight circuit board 133 is connected to the backlight 132 and located below the backlight 132, and is used for providing an electrical signal, including but not limited to a voltage signal and a current signal, for driving the backlight 132 to operate. Alternatively, the backlight film 131 may include, but is not limited to, a light guide plate (not shown), a reflective sheet (not shown) under the light guide plate, a diffusion sheet (not shown) over 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 receiving and supporting the backlight film 131 and the backlight 132. The backlight 132 may comprise an LED, Mini-LED, Micro-LED, OLED, VCSEL. The backlight circuit board 133 may be a flexible circuit board. The backlight film 131 can transmit the detection beam 101.

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

Optionally, the emission module 16 is disposed on an 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 which are oppositely disposed along the length axis. The emission module 16 is disposed on the inner wall of the side portion 172 at the bottom end of the optical detection device 1b, and the emission module 16 is located below the non-transparent region of the protection layer 11.

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.

Optionally, the transmitting module 16 may be fixedly connected or detachably connected to a preset position on the inner wall of the side portion 172 through a plurality of manners such as glue, double-sided tape, adhesive, bolt, bracket, fastener, slot, welding, and the like. Alternatively, the predetermined position of the inner wall may be a position facing the side 129 of the display panel 12 and the side 149 of the connection layer 14 or a position near the side. Optionally, the emission module 16 has an exit surface for exiting the detection beam 101, and the exit surface of the emission module 16 faces or faces the side surface 129 of the display panel 12 and/or the side surface 149 of the protection layer 14, so that the detection beam 101 can enter the display panel 12 from the side surface 129 or enter the connection layer 14 from the side surface 149.

Optionally, at least a 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 a portion of the detection module 19 is located in the opening of the bottom 171.

Referring to fig. 10A-10C, schematic top views of different modified embodiments of the optical inspection apparatus 1b of fig. 8 along the thickness axis in a downward direction (opposite to the arrow on the Z axis). 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. As shown in fig. 10A, the emission module 16 includes at least one light emitting unit 161 located on the central axis 103 and near the bottom end 130 of the optical display device 1 b. As shown in fig. 10B, the emission module 16 includes 3 light emitting units 161 that are symmetrical about the central axis 103 and located at the bottom end 130 of the optical detection device 1B. As shown in fig. 10C, the emission module 16 includes 4 light emitting units 161 symmetrical about the central axis 103, the two groups of light emitting units 161 are divided into two groups according to the 2 light emitting units 161, the two groups of light emitting units 161 are symmetrically distributed on two 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 apparatus 1 b. 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 number and the positions of the light emitting units 161 of the emission module 16 may be different, which is not limited in the embodiments of the present application.

Optionally, in this embodiment of the application, the light emitting unit 161 may be one or more of an LED (light emitting diode), an ld (laser diode), a vcsel (vertical cavity surface emitting laser), a Mini-LED, a Micro-LED, an OLED (organic light emitting diode), and a qled (quantum dot light emitting diode).

Alternatively, the light emitting unit 161 may be a top emission type or a side emission type light emitting element. The light emitting unit 161 has a light emitting surface (not numbered) for emitting the detection beam 101, and the light emitting surface is parallel, inclined, or perpendicular to the first surface 111.

The detection module 19 has a field of view region V1 on the first surface 111 of the protective layer 11. The external object 1000 is a finger, and at the part of the first surface 111 not in direct contact with the finger surface, for example: in the area of the first surface 111 not touched by the finger or the area directly opposite to the valley of the fingerprint, the detection beam 101 is totally reflected and continues to propagate. At the portion of the first surface 111 that contacts the finger surface, for example: at the position where the first surface 111 contacts with the ridge of the fingerprint, the detection light beam 101 is diffusely reflected, and at least a part of the diffusely reflected detection light beam 101 is transmitted through the protection layer 11, the display panel 12 and the backlight unit 13 to be received by the detection module 19 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, the detection module 19 is at least partially located in the opening, and the detection module 19 can be fixedly connected with the middle frame 17 through the opening.

The optical detection device 1b uses the display panel 12 or the connection layer 14 as a conducting medium of the detection beam 11, and the detection beam 101 can be directly irradiated or transmitted by total reflection to the field area V1 of the detection module 19 on the first surface 111. The detection beam 11 continues to be totally reflected at the position where the first surface 111 is opposite to the valley of the fingerprint, and is diffused and reflected at the contact position of the first surface 111 and the ridge of the fingerprint to be emitted. The detection module 19 receives the detection light beam 11 of diffuse reflection for imaging, and the light beam characteristic of diffuse reflection is diverged towards all directions in space, so the detection module 19 can be roughly arranged under the view field area V1 to receive the detection light beam 11 of diffuse reflection, and the detection module has the advantages of flexible position setting and small size or volume, and can meet the requirements of being arranged inside electronic equipment such as mobile phones.

Please refer to fig. 11, which is a schematic top view of a portion of an optical inspection apparatus 1c according to an embodiment of the present application. Referring to fig. 12 to 14, fig. 12 is a partial cross-sectional view of the optical detection device 1C of fig. 11 along the line B-B, fig. 13 is an enlarged view of the region M1C of fig. 12, and fig. 14 is a partial cross-sectional view of the optical detection device 1C of fig. 11 along the line C-C. Wherein the B-B line is parallel to the length axis (Y-axis) of the optical detection device 1C and the C-C line is parallel to the width axis (X-axis) of the optical detection device 1C.

The optical detection device 1c and the optical detection device 1b have substantially the same structure, and for convenience of description, the element numbers of the optical detection device 1c and the optical detection device 1b are kept consistent, and those skilled in the art can understand that the same reference numbers may represent the same elements, and may also represent similar elements that can be modified, 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 connection 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 receiving and supporting the protective layer 11, the display panel 12, and the backlight unit 13.

Alternatively, the backlight unit 13 includes a backlight film 131, a backlight 132, and a backlight circuit board 133. The display panel 12 includes an array substrate 122, a liquid crystal layer 123 and a color film 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 132 supplies visible light, and the backlight film 131 supplies the visible light supplied from the backlight 132 to the display panel 12 in a uniform and surface-emitting manner. The backlight circuit board 133 is electrically connected to the backlight 132 for providing electrical signals including, but not limited to, voltage signals and current signals to the backlight 132.

As shown in fig. 11, the display panel 12 has a notch 1202 at a corner near the bottom end of the optical detection device 1 c. It is understood that the display panel 12 can be regarded as a rectangular plate with a triangular cross section removed at the corners, and the notch 1202 corresponds to the removed portion of the display panel 12. For convenience of description, the shape of the cross section of the portion of the display panel 12 removed at the corner may be defined as the shape of the notch 1202 in a top view along the Z-axis, which is simply referred to as the shape of the notch 1202. Alternatively, in some embodiments, the backlight film 131 may have a shape substantially identical to the display panel 12 in a top view direction along the Z axis.

In fig. 11, it is shown that the display panel 12 has notches 1202 at two corners of the optical detection device 1c opposite to each other along the width axis. Alternatively, in other or modified embodiments, the notch 1202 may be formed only at the corner of one side.

Relative to the color filter substrate 124, the array substrate 122 has a terminal area 1221 beyond the color filter substrate 124. The backlight film 131 faces the display panel 12. The backlight 132 is located beside the backlight film 131 and directly under the terminal area 1221. The number of the backlight lamps 132 may be one or more, and the plurality of backlight lamps 132 are arranged in a row in a direction parallel to the width axis. Since the display panel 12 has the notch 1202 at the corner, the terminal area 1221 has a corresponding notch portion at the notch 1202.

The backlight circuit board 133 is located below the backlight 132, the backlight circuit board 133 has a strip structure, the backlight circuit board 133 extends to one side or two sides parallel to the width axis direction and exceeds the display panel 12, and the part of the backlight circuit board 133 exceeding the display panel 12 is defined as an extension part 1331 of the backlight circuit board 133. The extension 1331 faces the notch 1202 formed at the oblique side 1201 of the display panel 12, so that the upper side of the extension 1331 is not blocked by the display panel 12. The emission module 16 includes one or more light emitting units 161 for emitting the detection beam 101, and the light emitting units 161 are disposed on or above the upper surface of the extension 1331 of the backlight circuit board 133. The display panel 12 does not block the light emitting unit 161, or 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, there may be a partial overlap between 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.

Optionally, the emission module 16 further includes a supporting unit 162, and the light emitting unit 161 is disposed on the supporting unit 162. The supporting unit 162 is disposed on the extension 1331. The supporting unit 162 serves to elevate and support the light emitting unit 161 so that the spaced distance between the light emitting unit 161 and the protective layer 11 is small. Meanwhile, the supporting unit 162 is used to make the light emitting unit 161 and the display panel 12 or the connection layer 14 be located at substantially the same height. The light emitting unit 161 has a light emitting surface (not numbered) facing the side surface 129 of the display panel 12 and/or the side surface 149 of the connection layer 14, and the detection beam 101 can directly enter the display panel 12 or the connection layer 14 after exiting from the light emitting surface of the light emitting unit 161.

Of course, in other or modified embodiments, the light emitting surface of the light emitting unit 161 may face the protective layer 11 and be parallel to the first surface 111, or the light emitting surface of the light emitting unit 161 may be inclined or perpendicular to the first surface 111, only the requirement that the detection light beam 101 can enter the display panel 12 and/or the connection layer 14 is satisfied, which is not limited in this embodiment of the application.

Alternatively, 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 161 without the supporting unit 162.

Referring to fig. 15, which is a schematic top view of a portion of an optical inspection apparatus 1d of an alternative embodiment of the optical inspection apparatus 1c shown in fig. 11, the optical inspection apparatus 1d has substantially the same structure as the optical inspection apparatus 1c, except that the display panel 12 has

concave edges

1203, 1204 at corners near the bottom of the optical inspection apparatus 1c, the display panel 12 forms notches 1205 at the

edges

1203, 1204,

the notch 1205 has a different shape than the notch 1202 in fig. 11. Alternatively, the

edges

1203, 1204 may be arcs, lines, waves, etc. Optionally, at least a portion of the

edges

1203 and 1204 and the width axis of the relation detecting device 1d are at different inclination angles, or at the same inclination angle.

Optionally, in some embodiments, the

notches

1202 and 1205 may have different shapes and sizes, and a top view projection area of the

notches

1202 and 1205 in the Z-axis direction may be slightly larger than, equal to, or slightly smaller than a top view projection area of the light emitting surface of the light emitting unit 161 in the Z-axis direction. Optionally, in some embodiments, at least a portion of the light emitting surface of the light emitting unit 161 faces the

notches

1202 and 1205 without being blocked by the display panel 12.

Referring to fig. 16, which is a schematic top view of a portion of an optical detection device 1e of a modified embodiment of the optical detection device 1c shown in fig. 11, the optical detection device 1e has a structure substantially the same as that of the optical detection device 1c, except that the light-emitting surface of the light-emitting unit 161 faces the direction of the view field region V1, so that the detection light beam 101 can reach the view field region V1 by total reflection transmission with high efficiency.

The

optical detection device

1c, 1d, 1e of the embodiment of the present application has top and bottom that set up relatively along the length axis, utilizes the breach that display panel 12 formed at the corner that is close to the bottom position, will backlight circuit board 133 extends to the position just to the breach along width axial both sides and forms extension 1331, then sets up light emitting unit 161 on extension 1331 to the detection light beam 101 that light emitting unit 161 emitted can direct irradiation get into display panel 12 and/or connecting layer 14, and can not be blocked by terminal area 1221. The light emitting unit 161 and the backlight 132 may commonly use a backlight circuit board 133, and the backlight circuit board 133 may provide electrical signals to the light emitting unit 161 and the backlight 132, respectively. In this way, a circuit board for supplying power or driving the light emitting unit 161 is not required, and the internal space and elements of the display device 10 are saved.

Further, the transmitting module 16 may further include a supporting unit 162. The supporting unit 162 serves to elevate the light emitting surface of the light emitting unit 161 so that the light emitting unit 161 may be spaced apart from the second surface 112 of the protective layer 11 by a distance not 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 connection layer 14 with higher efficiency. Furthermore, the biological characteristic detection is performed by using the detection beam 101 which is subjected to diffuse reflection at the contact position of the external object 1000 and the first surface 111 and is 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, so that the biological characteristic detection effect is good.

Referring to fig. 17, an optical detection device 1f is a modified embodiment of the optical detection device 1b shown in fig. 8, and fig. 17 is a partial cross-sectional view of the optical detection device 1 f. The optical detection device 1f has substantially the same structure as the optical detection device 1b, except that the emission module 16 is disposed above the terminal area 1221. Alternatively, the emitting module 16 is located in the middle portion, both side portions, or both middle and side portions of the terminal area 1221 in the width axis direction. Optionally, the flexible circuit board 15 is subjected to an avoidance process at the position of the transmitting module 16. Further, please refer to fig. 18, which is a partial perspective view of the optical detection apparatus 1f shown in fig. 17. Wherein the emission module 16 includes a light emitting unit 161 for emitting the detection beam 101, the light emitting unit 161 being 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 bent outward to extend below the backlight unit 13. The flexible circuit board 15 has a keep-out area 151, at least a portion of the keep-out area 151 faces the terminal area 1221, and the light emitting unit 161 may be at least partially located in the keep-out area 151. Of course, in other or modified embodiments, the light emitting unit 161 may have different configurations, for example, but not limited to, the light emitting unit 161 may be disposed at a portion of the terminal area 1221 that is not connected to the flexible circuit board 15. Since the light emitting unit 161 is directly disposed on the terminal area 1221 and is closer to the side of the display panel 12 or the connection layer 14, the detection beam 101 emitted therefrom can efficiently enter the display panel 12 or the connection layer 14.

In the 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 comprises a plurality of detection light rays, and the included angle of at least two detection light rays is not less than 10 degrees, 15 degrees, 20 degrees and 25 degrees. In addition, the detection beam 101 is invisible light, including but not limited to near infrared light. The near infrared light is, for example, a light beam having a wavelength in the range of 750nm to 2000nm (nanometers). For example, but not limited to, the detection beam 101 is near infrared light with a wavelength of 800nm to 1200 nm.

It is to be understood that although the present application is generally described in the context of fingerprints for illustrative purposes, 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 apparatus 1 can be any object to be imaged. Generally, a test object may have various characteristics including a biological characteristic. It should be noted that, as an example, the optical detection device 1 of the present invention is described with a finger fingerprint as a detection object, and it is understood that lines such as palm, toe, palm print, skin surface texture and the like can also be used as features of the detection object of the present invention or an external object to be detected.

It should be noted that the figures of the present invention are only exemplary, and in practice, the size of the ridges and valleys of the fingerprint is very small (about 300 micrometers to 500 micrometers), and the range of the fingerprint to be detected (corresponding to the field of view V1) during fingerprint detection is about 4 mm by 4 mm to 10 mm by 10 mm, or a larger range area. In the embodiment of the present application, the detection module 19 receives the detection beam 101 diffusely reflected at the ridge and is used for optical imaging of the fingerprint. However, the invention is not limited thereto, and the detection module 19 may receive other light beams with fingerprint feature information for imaging or detection. For example, but not limiting of, the detection module 19 may receive the detection beam 101 directly reflected from the surface of the user's finger (including the ridges and/or valleys of the fingerprint) and used for fingerprint detection; for example, but not limited to, the detection module 19 may receive visible light and/or invisible light in the external environment reflected by the user's finger and be used for fingerprint detection; for example, but not limited to, the detection module 19 may receive visible light and/or invisible light in an external environment transmitted by a user's finger and be used for fingerprint detection; for example, but not limited to, the detection module 19 may receive visible light and/or invisible light emitted by a user's finger and be used for fingerprint detection. Further, the fingerprint detection may be performed for other detection objects, and the characteristic information of the detection object may be obtained by an optical imaging method. Therefore, although the embodiment of the present invention is described with reference to receiving the diffusely reflected detecting light beam 101, other possible light beams for optical imaging of a fingerprint are within the scope of the present invention.

It should be noted that the light exit surface, the light incident surface, and the like that may appear in the description of the present application may be a real surface that actually exists, or may be an imaginary surface, which does not affect the implementation of the technical solution of the present application, and all belong to the scope of the present application. In addition, "overlap", and the like, which may occur in the description of the present application, are to be understood as having the same meaning and being replaceable with each other.

It should be noted that, part or all of the embodiments of the present application, and part or all of the modifications, substitutions, alterations, splits, combinations, extensions, etc. of the embodiments are all considered to be covered by the inventive concept of the present application, and belong to the protection scope of the present application, without inventive efforts.

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

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

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

Claims

1. An optical inspection apparatus, comprising:

a display device, comprising:

2. The optical inspection device of claim 1, wherein the display module comprises:

the display panel is positioned on one side of the second surface of the protective layer;

the connecting layer is positioned between the protective layer and the display panel and is used for connecting the protective layer and the display panel;

and the backlight unit is positioned below the display panel and provides visible light which can penetrate through the display panel and the protective layer, and the display panel displays information by utilizing the visible light.

3. The optical inspection device of claim 2, wherein the inspection beam enters the protective layer from the connection layer, the inspection beam is capable of total reflection transmission within the protective layer, or the inspection beam is capable of total reflection transmission within the protective layer and the connection layer, or the inspection beam is capable of total reflection transmission within the protective layer, the connection layer, and at least a portion of the display panel.

4. The optical inspection device of claim 3, wherein the connection layer has an upper surface facing the protective layer, a lower surface facing the display panel, and a side surface connecting the upper and lower surfaces, the inspection beam entering the connection layer from at least a portion of the side surface of the connection layer and then entering the protective layer from the connection layer; wherein the detection beam is transmitted in a total reflection manner in the protective layer, and the detection beam comprises: the detection light beam is transmitted between the first surface and the second surface of the protective layer in a total reflection mode; the detection beam is transmitted in a total reflection mode in the protective layer and the connecting layer, and the detection beam comprises the following steps: the detection beam is transmitted between the first surface of the protective layer and the lower surface of the connecting layer in a total reflection mode.

5. The optical inspection device of claim 2, wherein the inspection beam enters the protective layer from the display panel via a connection layer, the inspection beam is capable of total reflection transmission within the protective layer, or the inspection beam is capable of total reflection transmission within the protective layer and the connection layer, or the inspection beam is capable of total reflection transmission within the protective layer, the connection layer, and at least a portion of the display panel.

6. The optical detection device according to claim 5, wherein 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 opposite upper and lower surfaces and side surfaces connecting the upper and lower surfaces, and the detection light beam can enter the display panel from the side surface of one or more 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 beam is transmitted in a total reflection manner in the protective layer, and the detection beam comprises: the detection light beam is transmitted between the first surface and the second surface of the protective layer in a total reflection mode; the detection beam is transmitted in a total reflection mode in the protective layer and the connecting layer, and the detection beam comprises the following steps: the detection light beam is transmitted between the first surface of the protective layer and the lower surface of the connecting layer in a total reflection mode;

the total reflection transmission of the detection beam in the protective layer, the connecting layer and at least part of the display panel comprises the following steps: the detection light beam can be transmitted between the first surface of the protective layer and the lower surface of the color film substrate in a total reflection manner, or the detection light beam can be transmitted between the first surface of the protective layer and the lower surface of the liquid crystal layer in a total reflection manner, or the detection light beam can be transmitted between the first surface of the protective layer and the lower surface of the array substrate in a total reflection manner.

7. The optical inspection device of claim 2, wherein the protective layer includes a transparent region and a non-transparent region located around or at an edge of the transparent region, the transparent region being configured to transmit the visible light and the inspection beam, the non-transparent region being configured to block the visible light and transmit the inspection beam, the emission module being located below the non-transparent region of the protective layer, and at least a portion of the inspection module being located below the transparent region.

8. The optical inspection device of claim 2, wherein 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 inspection device as claimed in claim 2, wherein the display device further comprises a middle frame for receiving the display module and the protection layer, the middle frame has a frame structure with a bottom and a side, the side extends vertically upwards to the protection layer along an edge of the bottom, the bottom is located below the backlight unit, and the side is located outside the display panel and the backlight unit.

10. The optical inspection device according to claim 9, wherein the optical inspection device has a length axis and a width axis perpendicular to each other, the optical inspection device includes a top end and a bottom end oppositely disposed along the length axis, and the emission module is disposed at the bottom end and located on an inner wall of a side portion of the middle frame.

11. The optical inspection device of claim 9, wherein the bottom of the middle frame has an opening corresponding to the inspection module, and at least a portion of the inspection module is located in the opening.

12. The optical inspection device as claimed in claim 2, wherein the emission module has a light-emitting surface for emitting the inspection beam, the light-emitting surface faces the side surface of the display panel and/or the connection layer and is spaced apart from the side surface of the display panel, and the inspection beam is directly projected to the side surface of the display panel and/or the connection layer.

13. The optical inspection device of claim 2, wherein the protective layer, the connection layer, and the display panel together form a light guide unit, a side surface of the connection layer and a side surface of the display panel together form a light incident region, and the inspection beam emitted by the emission module enters the light guide unit from the light incident region and can be transmitted by total reflection in at least a portion of the light guide unit.

14. The optical inspection device according to claim 1, wherein the emission module emits an inspection beam when an external object contacts the field of view area, the inspection beam can enter the protective layer through the display module, and the inspection beam entering the protective layer can be totally reflected in the field of view area.

15. The optical inspection device of claim 1 wherein the optical inspection device has a length axis and a width axis that are perpendicular to each other, the optical inspection device including a top end and a bottom end that are oppositely disposed along the length axis, the emitter module being located at the bottom end of the optical inspection device.

16. The optical inspection device of claim 1, wherein the emission module includes 3 light emitting units for emitting the inspection light beams, the light emitting units being disposed near a bottom end of the optical inspection device and symmetrically distributed about a central axis, the central axis being a straight line parallel to a length axis of the optical inspection device; or the emission module comprises 4 light-emitting units which are symmetrical about the central axis, the 4 light-emitting units are divided into two groups according to 2 light-emitting units, the two groups of light-emitting units are symmetrically distributed on two sides of the central axis, and the 2 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 comprises 3 groups of light-emitting units, each group of light-emitting units comprises 2 light-emitting units, and the 3 groups of light-emitting units are symmetrical about the central axis.

17. The optical inspection device as claimed in claim 1, wherein the emission module includes a light-emitting unit for emitting the inspection beam, the light-emitting unit is a top-emission or side-emission type light-emitting device, the light-emitting unit has a light-emitting surface for emitting the inspection beam, and the light-emitting surface is parallel, inclined or perpendicular to the first surface.

18. The optical inspection device of claim 2, wherein the inspection module is located below the backlight unit.

19. The optical inspection device of claim 2 wherein the optical inspection device has a length axis and a width axis that are perpendicular to each other, the backlight unit includes a backlight film, a backlight for providing visible light, the backlight film is used for providing 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 with the backlight lamp and is used for providing an electric signal for the backlight lamp, the opposite ends or one end of the backlight circuit board along the direction parallel to the width axis of the optical detection device extend outwards and exceed the display panel, and the part of the backlight circuit board exceeding the display panel is defined as an extension part, the emission module comprises one or more light-emitting units for emitting detection light beams, and the light-emitting units are arranged on or above the upper surface of the extension part.

20. The optical inspection device of claim 19, wherein the optical inspection device includes a top end and a bottom end disposed opposite to each other along the length axis, the display panel has a notch at a corner near the bottom end of the optical inspection device, the extension portion faces the notch, and an orthogonal projection of the light emitting unit on the first surface and an orthogonal projection of the display panel on the first surface do not overlap or partially overlap.

21. The optical inspection device according to claim 19, wherein the emission module further comprises a support unit, the light emitting unit is disposed on the support unit, the support unit is disposed on the extension portion, and the support unit is configured to elevate and support the light emitting unit such that a separation distance between the light emitting unit and the protective layer becomes smaller.

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

23. The optical inspection device as claimed in claim 22, wherein the display panel further comprises a flexible circuit board, one end of the flexible circuit board is connected to the upper surface of the terminal area and is bent outward to extend to a position below the backlight unit, and the flexible circuit board has an empty-avoiding area corresponding to the position of the emission module; or the emission module comprises a light-emitting unit for emitting detection light beams, and the light-emitting unit is arranged at the part of the terminal area which is not connected with the flexible circuit board.