CN210895486U

CN210895486U - Under-screen fingerprint identification device, LCD fingerprint identification system, electronic equipment and light guide film

Info

Publication number: CN210895486U
Application number: CN201922001378.4U
Authority: CN
Inventors: 张胜斌; 熊峰; 刘文拯
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2020-06-30
Anticipated expiration: 2029-11-19

Abstract

The utility model provides a fingerprint recognition device, LCD fingerprint identification system, electronic equipment and leaded light membrane under the screen, fingerprint recognition device are applied to the electronic equipment who has liquid crystal display screen under the screen, and fingerprint detection area of fingerprint recognition device is located the display area of liquid crystal display screen at least part under the screen. Fingerprint identification device is including detecting light source, fingerprint identification module and leaded light membrane under the screen, and detection light source and fingerprint identification module all are located liquid crystal display screen under. The utility model discloses a light guide film guides the detecting light of detecting light source transmission to the light emission end to make the detecting light shine the finger of fingerprint detection area top and form the fingerprint detection light that carries fingerprint information through the light emission end, and receive the fingerprint detection light that sees through the printing opacity region through the fingerprint identification module and detect the fingerprint image in order to acquire the finger, thereby when realizing the fingerprint identification under the screen, help reducing the regional width of chin of current electronic product.

Description

Under-screen fingerprint identification device, LCD fingerprint identification system, electronic equipment and light guide film

Technical Field

The utility model relates to a fingerprint identification technical field especially relates to a fingerprint identification device, liquid crystal display screen fingerprint identification system, electronic equipment and leaded light membrane under screen.

Background

Along with the development of the full-screen of the smart phone, the requirements of the smart phone on screen occupation ratio are higher and higher, and the technology of fingerprint identification under the screen is in the trend.

At present, a mobile phone adopting a Liquid Crystal Display (LCD) screen needs to supplement light by using an infrared light source, infrared light emitted by the infrared light source irradiates a finger above a fingerprint detection area on the LCD screen and forms fingerprint detection light carrying fingerprint information by the finger, and a fingerprint identification module receives the fingerprint detection light, so that a function of identifying fingerprints under the screen is realized. In the prior art, an infrared light source is usually arranged in a chin area of an electronic product such as a mobile phone through a flexible circuit board to perform infrared light supplement, so that a fingerprint identification function under a screen is realized. The chin area of the mobile phone is the lower part of the edge area of the protective cover plate of the LCD screen, and is often used as an area for liquid crystal wiring and used for bending a circuit board of the LCD screen and pressing the LCD screen. The infrared light source is arranged in the chin area of the electronic product through the flexible circuit board, so that the width size of the chin area of the mobile phone can be occupied, the chin area of a screen of the mobile phone is widened, the integral screen occupation ratio of the mobile phone is influenced, and the screen occupation ratio of the mobile phone is obviously reduced.

However, the width of the infrared light source, the thickness of the flexible circuit board connected to the infrared light source, and the thickness of the glue applied to the middle frame of the electronic product such as a mobile phone by the infrared light source are all limited size requirements, which are difficult to be narrower, so that the chin area of the electronic product is wider.

SUMMERY OF THE UTILITY MODEL

The utility model provides a fingerprint identification device, liquid crystal display screen fingerprint identification system, electronic equipment and leaded light membrane under screen helps reducing the regional width of chin of current electronic product.

In a first aspect, the present invention provides an underscreen fingerprint identification device, which is applied to an electronic device having a liquid crystal display screen, wherein a fingerprint detection area of the underscreen fingerprint identification device is at least partially located in a display area of the liquid crystal display screen; the under-screen fingerprint identification device comprises a detection light source and a fingerprint identification module, wherein the detection light source and the fingerprint identification module are both positioned below the liquid crystal display screen;

the detection light source is used for emitting detection light, and the detection light irradiates the finger above the fingerprint detection area through the guidance of the light guide film so as to form fingerprint detection light carrying fingerprint information; the light receiving end of the light guide film is arranged opposite to the light emitting surface of the detection light source, and the light emitting end of the light guide film is arranged close to the fingerprint detection area; the fingerprint identification module is used for receiving the fingerprint detection light penetrating through the liquid crystal display screen so as to acquire a fingerprint image of the finger.

In an embodiment of the present invention, the light guiding film is a film material structure having light guiding and reflecting functions for the detecting light.

In a specific embodiment of the utility model, the LCD screen includes backlight unit, be formed with on the backlight unit and be used for making the light transmission area that the fingerprint detected the light and sees through, the fingerprint identification module is located backlight unit under the light transmission area, so that the fingerprint detects the light and sees through backlight unit transmits to the fingerprint identification module.

In an embodiment of the present invention, the detection light or the fingerprint detection light is different from the wavelength of the backlight for displaying the image provided by the backlight module.

The utility model discloses an in a specific embodiment, survey the light sum/or fingerprint detection light is the infrared light, backlight that backlight unit provided is visible light, the leaded light membrane is infrared leaded light membrane.

In an embodiment of the present invention, the light guiding film includes a light guiding layer for guiding the detection light and a reflecting layer coated on the surface of the light guiding layer and used for reflecting the detection light;

the light guide layer has a light guide performance for the detection light which is greater than a light guide performance for the backlight of the liquid crystal display screen, and the reflection layer has a reflection performance for the detection light which is greater than a reflection performance for the backlight of the liquid crystal display screen.

The utility model discloses an in a specific embodiment, the reflection stratum is in respectively the light receiving terminal with light emission department is equipped with dodges the region, so that the part leaded light layer is located the surface of leaded light membrane is located leaded light membrane surface leaded light layer is being close to the testing light source with fingerprint detection region department forms light receiving element and light emission unit respectively.

In an embodiment of the present invention, the light emitting surface of the detection light source is located at one side of the light guiding film and is opposite to the light receiving unit;

or the light emitting surface of the detection light source is wrapped in the light guide film and is opposite to the light receiving unit.

In a specific embodiment of the present invention, the light guide layer or the reflective layer is provided with an accommodating space for accommodating at least a portion of the detection light source.

In an embodiment of the present invention, the light guide layer at the light emitting unit is provided with diffusing particles, and the diffusing particles are used to adjust an emitting angle of the probe light, so that the probe light irradiates the fingerprint detection area;

and/or, the surface of the light guide layer at the light ray emission unit is provided with an optical element, and the optical element is used for adjusting the emission angle of the detection light so as to enable the detection light to irradiate the fingerprint detection area.

In an embodiment of the present invention, the light receiving unit and the light emitting unit are located on the same surface or both surfaces of the light guiding film.

In an embodiment of the present invention, the detection light source is a positive or side emitting detection light source.

In a specific embodiment of the present invention, the liquid crystal display screen includes a liquid crystal panel and a protective cover plate, the liquid crystal panel is located between the protective cover plate and the backlight module, and the light guiding film includes the light receiving end, the light emitting end, and a light guiding film body located between the light receiving end and the light emitting end; the light guide film body is located below the edge area of the protective cover plate and located on the same side of the backlight module and the liquid crystal panel.

In an embodiment of the present invention, the circuit board of the liquid crystal panel is a first circuit board, the circuit board of the electronic device is a second circuit board, wherein the detection light source is attached to the first circuit board, or the detection light source is attached to the second circuit board.

In an embodiment of the present invention, the detection light source is attached to the outer surface of the first circuit board and located under the backlight module, the first circuit board is covered on the liquid crystal panel and the backlight module is attached to the same side and electrically connected to the liquid crystal panel, the light receiving end is attached to the outer surface of the first circuit board.

In an embodiment of the present invention, the light emitting end is attached to the first circuit board and extends toward the protective cover plate, so that the light emitting end is located between the protective cover plate and the liquid crystal panel;

or the light emitting end is positioned on the first circuit board and close to the bending part of the protective cover plate, so that at least part of the detection light emitted by the light emitting end can irradiate the finger above the fingerprint detection area.

In an embodiment of the present invention, the light guiding film and the first circuit board are bent synchronously.

In a specific embodiment of the present invention, the light emitting end is attached to the inner wall of the middle frame of the electronic device, and extends along the inner wall of the middle frame toward the direction of the protective cover plate, so that at least a part of the detecting light emitted by the light emitting end can irradiate onto the finger above the fingerprint detection area.

In an embodiment of the present invention, the light emitting end is attached to the inner wall of the frame of the middle frame.

In a specific embodiment of the present invention, the frame is provided with a supporting structure for supporting the protection cover plate, the light emitting end is located on one side of the supporting structure, or the light emitting end is attached to the protection cover plate and between the supporting surfaces of the supporting structure.

The utility model discloses a in a specific embodiment, the direct laminating of light emission end is in the surface of the inner wall of frame, perhaps, the frame with the relative position department of light emission end is equipped with and is used for holding the accommodation space of light emission end, so that at least part the light emission end inlays to be established in the frame.

In an embodiment of the present invention, an isolation layer is further disposed on an outer surface of the first circuit board, and the light guiding film or the light receiving end is attached to the outer surface of the first circuit board through the isolation layer;

or, the isolation layer is provided with an avoiding space at a position opposite to the light guide film or the light receiving end, so that the light guide film or the light receiving end is directly attached to the outer surface of the first circuit board.

In an embodiment of the present invention, the detection light source and the liquid crystal panel share one, the first circuit board is connected to an external circuit, or the detection light source is electrically connected to the first circuit board through a third circuit board.

In an embodiment of the present invention, the light source is attached to the second circuit board, the light receiving end is attached to the second circuit board, the light emitting end is attached to the inner wall of the middle frame of the electronic device, and along the inner wall of the middle frame extends toward the direction of the protective cover plate, so that at least a part of the detecting light emitted from the light emitting end can be irradiated to the finger above the fingerprint detection area.

The utility model discloses an in a specific embodiment, the direct laminating of light emission end is in on the inner wall of frame, perhaps the frame with the relative position department of light emission end is equipped with and is used for holding the accommodation space of light emission end, so that at least part the light emission end inlays to be established in the frame.

The utility model discloses an in a specific embodiment, the leaded light membrane the laminating of leaded light membrane body is in on the center, the light receiving terminal passes the backup pad laminating of center is in on the second circuit board, wherein, the frame encloses to be established the border region of backup pad.

In a specific embodiment of the present invention, the supporting plate is horizontally disposed between the lcd screen and the second circuit board, and the supporting plate is provided with a third opening at a position opposite to the light guiding film, wherein the third opening is used for allowing the light guiding film to pass through the supporting plate and the second circuit board.

In an embodiment of the present invention, the light guiding film is at least partially bendable.

In a second aspect, the utility model provides a liquid crystal display fingerprint identification system is applied to electronic equipment, its include the liquid crystal display screen and as above arbitrary the screen under fingerprint identification device and leaded light membrane, fingerprint identification device includes the testing light source under the screen, the testing light source is used for launching the probe light, the probe light passes through the finger of fingerprint detection region top is shone in the guide of leaded light membrane to form the fingerprint detection light that carries fingerprint information.

In a third aspect, the present invention provides an electronic device, which includes the above-mentioned fingerprint identification system for liquid crystal display.

In a fourth aspect, the present invention provides a light guiding film, which is suitable for an electronic device having a liquid crystal display screen and an underscreen fingerprint identification device, wherein a fingerprint detection area of the underscreen fingerprint identification device is at least partially located in a display area of the liquid crystal display screen; the under-screen fingerprint identification device comprises a detection light source and a fingerprint identification module, wherein the detection light source and the fingerprint identification module are both positioned below the liquid crystal display screen;

In an embodiment of the present invention, the light guide film includes a light guide layer for guiding the detection light and a reflection layer coated on the surface of the light guide layer and used for reflecting the detection light;

In a specific embodiment of the present invention, the light emitting surface of the detection light source is located on one side of the light guiding film and is disposed opposite to the light receiving unit, or the light emitting surface of the detection light source is wrapped in the light guiding film and is disposed opposite to the light receiving unit.

In an embodiment of the present invention, diffusion particles are disposed in the light guide layer of the light emitting unit, and the diffusion particles are used to adjust an emitting angle of the probe light, so that the probe light irradiates the fingerprint detection area;

and/or, the surface of the light guide layer of the light emitting unit is provided with an optical element, and the optical element is used for adjusting the emitting angle of the detection light so that the detection light irradiates the fingerprint detection area.

The utility model provides an among the fingerprint identification device under the screen, liquid crystal display screen fingerprint identification system, electronic equipment and the leaded light membrane, lie in the testing light source below the liquid crystal display screen, through the setting of leaded light membrane, set up the light receiving terminal of leaded light membrane and the light emitting area of testing light source relatively, the light emission end is close to the setting of fingerprint detection area, lead the probe light of testing light source transmission to the light emission end through the leaded light membrane, so that the probe light shines the finger above the fingerprint detection area and forms the fingerprint detection light that carries fingerprint information through the light emission end; the fingerprint identification module is positioned below the liquid crystal display screen and used for receiving fingerprint detection light penetrating through the light transmission area so as to acquire a fingerprint image of a finger, so that the width of a chin area of an existing electronic product is reduced while the under-screen fingerprint identification of the electronic equipment adopting the LCD screen is realized; and then solved prior art electronic product and established the infrared light source in electronic product chin area through flexible circuit board, the cell-phone screen chin area that leads to widens, and the problem that influences the holistic screen of cell-phone and accounts for the ratio.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

FIG. 1 is a schematic diagram of a prior art handset equipped with an underscreen fingerprint identification device;

fig. 2 is a schematic structural diagram of a first mobile phone equipped with an underscreen fingerprint identification device according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a second mobile phone equipped with an underscreen fingerprint identification device according to an embodiment of the present invention;

fig. 4 is a schematic view illustrating a positional relationship between a light guiding film and a first circuit board according to a first embodiment of the present invention;

fig. 5 is a schematic view illustrating a positional relationship between another light guiding film and a first circuit board according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a light guiding film according to an embodiment of the present invention;

fig. 7 is a schematic structural view of another light guiding film according to an embodiment of the present invention;

fig. 8 is a schematic view of a light receiving end structure of a first light guiding film according to an embodiment of the present invention;

fig. 9 is a schematic view of a light receiving end structure of a second light guiding film according to an embodiment of the present invention;

fig. 10 is a schematic view of a light receiving end structure of a third light guiding film according to an embodiment of the present invention;

fig. 11 is a schematic view of a light receiving end structure of a fourth light guiding film according to an embodiment of the present invention;

fig. 12 is a schematic view of a light receiving end structure of a fifth light guiding film according to an embodiment of the present invention;

fig. 13 is a schematic view of a light receiving end structure of a sixth light guiding film according to an embodiment of the present invention;

fig. 14 is a schematic view of a light emitting end structure of a first light guiding film according to an embodiment of the present invention;

fig. 15 is a schematic view of a light emitting end structure of a second light guiding film according to an embodiment of the present invention;

fig. 16 is a schematic view of a light emitting end structure of a third light guiding film according to an embodiment of the present invention;

fig. 17 is a schematic view of a light emitting end structure of a fourth light guiding film according to an embodiment of the present invention;

fig. 18 is a schematic view of a light emitting end structure of a fifth light guiding film according to an embodiment of the present invention;

fig. 19 is a schematic view of a light emitting end structure of a sixth light guiding film according to an embodiment of the present invention;

fig. 20 is a schematic structural diagram of a first mobile phone equipped with an underscreen fingerprint identification device according to a second embodiment of the present invention;

fig. 21 is a schematic partial structure diagram of a second mobile phone equipped with an underscreen fingerprint identification device according to an embodiment of the present invention;

fig. 22 is a schematic structural diagram of a first mobile phone equipped with an underscreen fingerprint identification device according to a third embodiment of the present invention;

fig. 23 is a schematic partial structure diagram of a second mobile phone equipped with an underscreen fingerprint identification device according to a third embodiment of the present invention.

Description of reference numerals:

a mobile phone-100; a liquid crystal display screen-10; a display module-11; a protective cover-111; edge extension-1111; infrared ink-1112; a liquid crystal panel-112; a first circuit board-1121; an isolation layer-1122; a backlight module-12; an optical film-121; a steel plate-122; a second opening-1221; an underscreen fingerprint identification device-20; a detection light source-21; a third circuit board-211; a fingerprint identification module-22; a light directing film-23; a light guide layer-231; a reflective layer-232; a light receiving end-233; a light receiving unit-2331; light emitting end-234; a light emitting unit-2341; avoidance zone-235; diffusion particle-236; an optical element-237; a light directing film body-238; -239 of a receiving space; middle frame-30; a frame-31; a support structure-311; a support surface-312; a support plate-32; a first opening-321; a third opening-322; a second circuit board-40.

Detailed Description

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

The technical solution of the present invention will be described in detail with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

As described in the background art, in the prior art, referring to fig. 1, an infrared light source is generally disposed in a chin area of an electronic product, such as a mobile phone 100, through a flexible circuit board (i.e., a third circuit board) to perform infrared light supplement, so as to achieve a fingerprint recognition function under a screen. Because the infrared light source is arranged in the chin area of the electronic product through the flexible circuit board, the width of the chin area of the mobile phone 100 is additionally occupied, so that the chin area of the screen of the mobile phone 100 is widened, the integral screen occupation ratio of the mobile phone 100 is influenced, and the screen occupation ratio of the mobile phone 100 is obviously reduced. However, since the width of the infrared light source, the thickness of the flexible circuit board connected to the infrared light source, and the thickness of the glue applied to the middle frame 30 of the electronic product such as the mobile phone 100 by the infrared light source are all the limit size requirements, it is difficult to make the width narrower in the prior art, which results in a wider chin area of the electronic product, thereby affecting the screen occupation ratio of the mobile phone 100.

Therefore, the utility model provides a fingerprint identification device 20, liquid crystal display screen fingerprint identification system, electronic equipment and leaded light membrane 23 under the screen helps reducing the regional width of chin of current electronic product to improve the screen of electronic product and account for than.

The embodiment of the utility model provides a be applied to electronic equipment's screen fingerprint identification device 20 down, liquid crystal display screen fingerprint identification system and leaded light membrane 23, wherein, electronic equipment can include but not limited to adopt the cell-phone 100 of liquid crystal display screen 10, panel computer, TV set, notebook computer, digital photo holder frame, navigator, fingerprint lock isoelectron product or part. Electronic equipment includes LCD screen 10, center 30 and the embodiment of the utility model provides a fingerprint identification device 20 or LCD screen fingerprint identification system under the screen.

The following embodiment uses the application scenario of the mobile phone 100 using the lcd screen 10 as an example, and it is right that the fingerprint recognition device 20, the lcd screen fingerprint recognition system and the light guide film 23 of the present invention are further described.

Example one

Fig. 2 is the embodiment of the utility model provides a first kind be equipped with the structure schematic diagram of fingerprint recognition device's under the screen cell-phone, fig. 3 is the utility model provides a second kind be equipped with the structure schematic diagram of fingerprint recognition device's under the screen cell-phone, fig. 4 is the utility model provides a position relation schematic diagram of a leaded light membrane and first circuit board that provides, fig. 5 is the utility model provides a position relation schematic diagram of another kind of leaded light membrane and first circuit board that provides.

Referring to fig. 2 to 5, the present invention provides an under-screen fingerprint identification apparatus 20, which is applied to an electronic device having a liquid crystal display screen 10, wherein a fingerprint detection area (not identified in the figures) of the under-screen fingerprint identification apparatus 20 is at least partially located in a display area of the liquid crystal display screen 10; the under-screen fingerprint identification device 20 comprises a detection light source 21 and a fingerprint identification module 22, wherein the detection light source 21 and the fingerprint identification module 22 are both positioned below the liquid crystal display screen 10;

the detection light source 21 is used for emitting detection light, and the detection light irradiates a finger above a fingerprint detection area through the guidance of the light guide film 23 so as to form fingerprint detection light carrying fingerprint information; wherein, the light receiving end 233 of the light guiding film 23 is arranged opposite to the light emitting surface of the detection light source 21, and the light emitting end 234 of the light guiding film 23 is arranged close to the fingerprint detection area; the fingerprint identification module 22 is used for receiving the fingerprint detection light transmitted through the liquid crystal display screen 10 to acquire a fingerprint image of a finger.

It should be noted that the screen occupation ratio is a ratio of the screen area to the whole area, that is, the larger the screen occupation ratio is, which is more beneficial to the user experience. The full screen is a broader definition of the ultra-high screen design of the handset 100 in the industry of the handset 100. The full screen cell-phone 100 can promote the color value of cell-phone 100, lets cell-phone 100 look more technological sense, and the positive area of same fuselage can hold bigger screen in addition, has showing promotion to visual experience.

Specifically, in this embodiment, referring to fig. 2 and fig. 3, a display area (not labeled in the figures) of the liquid crystal display screen 10 is an area for displaying a picture on the liquid crystal display screen 10 or the mobile phone 100. The fingerprint detection area of the underscreen fingerprint identification device 20 is at least partially located in the display area of the liquid crystal display screen 10, so that the area of the display area on the liquid crystal display screen 10 is increased on the basis of realizing underscreen fingerprint identification, and better user experience is obtained. The fingerprint detection area may be specifically an area for a user to perform finger pressing to implement a fingerprint input operation.

In order to reduce the increase of the width of the chin area of the mobile phone 100 caused by the detection light source 21 being disposed in the chin area of the mobile phone 100, referring to fig. 2 and 3, in the present embodiment, the detection light source 21 is disposed below the liquid crystal display screen 10. Further, in order to avoid the detection light emitted by the detection light source 21 being blocked by the liquid crystal display screen 10, in the present embodiment, the light guiding film 23 is disposed such that the light receiving end 233 of the light guiding film 23 is disposed opposite to the light emitting surface of the detection light source 21, and the light emitting end 234 thereof is disposed close to the fingerprint detection area; the light guiding film 23 serves to guide the probe light emitted from the detection light source 21 to the light emitting end 234, so that the detection light is irradiated to the finger above the fingerprint detection area through the light emitting end 234 and forms fingerprint detection light carrying fingerprint information, the fingerprint detection light transmitted through the lcd screen 10 is received by the fingerprint identification module 22 to obtain a fingerprint image of the finger, thereby realizing the identification of the fingerprint under the screen, compared with the prior art that the width of the chin area of the mobile phone 100 is increased by placing the detection light source 21 in the chin area (as shown in fig. 1), the method can help to reduce the increased width of the chin area of the mobile phone 100, or the width of the chin area of the mobile phone 100 is not increased (i.e. the original width of the chin area can be maintained while the fingerprint identification under the screen is realized), so that the screen occupation ratio of the electronic product such as the mobile phone 100 is improved.

Referring to fig. 2 and 3, the detection light source 21 may be located under an edge non-display area (not shown) of the lcd screen 10 (e.g., near the chin area of the mobile phone 100), and the fingerprint recognition module 22 may be disposed under a display area (not shown) of the lcd screen 10 (e.g., under the backlight module 12). The non-display area is located at the periphery of the display area, and the non-display area is an area on the liquid crystal display screen 10 where display is not performed or a display function is not performed, such as a chin area. Specifically, in the present embodiment, since the light receiving end 233 of the light guiding film 23 is disposed opposite to the light emitting surface of the detection light source 21, the light guiding film 23 is disposed close to the detection light source 21 and is located in the non-display area of the liquid crystal display screen 10.

Referring to fig. 2 and 3, the protective cover 111 of the lcd screen 10 may have an edge extension 1111 corresponding to a chin area of the mobile phone 100, which may be used as a trace area of the lcd panel 112, relative to the backlight module 12 of the lcd screen 10.

Specifically, the liquid crystal panel 112 and the protective cover 111 form the display module 11 of the liquid crystal display screen 10, the liquid crystal panel 112 may be a touch-control liquid crystal panel 112 with a touch-control detection function, and the protective cover 111 is disposed above the liquid crystal panel 112 for protecting the liquid crystal panel 112 and providing a human-computer interaction interface for a user to operate with fingers.

In the utility model, the detecting light source 21 is positioned under the liquid crystal display screen 10, the light receiving end 233 of the light guiding film 23 is arranged opposite to the light emitting surface of the detecting light source 21 through the arrangement of the light guiding film 23, the light emitting end 234 is arranged close to the fingerprint detecting area, the detecting light emitted by the detecting light source 21 is guided to the light emitting end 234 through the light guiding film 23, so that the detecting light irradiates the finger above the fingerprint detecting area through the light emitting end 234 and forms the fingerprint detecting light carrying the fingerprint information; the fingerprint identification module 22 is located below the liquid crystal display screen 10 and is configured to receive fingerprint detection light penetrating through the light-transmitting area to obtain a fingerprint image of a finger, so that the width of a chin area of an existing electronic product is reduced while the under-screen fingerprint identification of the electronic device using the LCD screen is realized; and then solved the electronic product of prior art and establish the infrared light source in the electronic product chin area through flexible circuit board, the regional widening in cell-phone 100 screen chin that leads to influences the problem that the whole screen of cell-phone 100 accounts for the ratio.

Further, in order to make the light guiding film 23 have better guiding effect to the detecting light that detects the light source 21 transmission, in this embodiment, the light guiding film 23 is for having the membrane material structure of leaded light and reflex action to the detecting light to improve the light utilization ratio of detecting the light source 21, and then improve the light intensity of the detecting light that is used for fingerprint identification.

Liquid crystal display screen 10 generally includes backlight unit 12 of display module 11 below, fingerprint identification module 22 is located below backlight unit 12, detect the light of light source 21 subassembly transmission and the fingerprint that shines to point and form and detect light and can pass liquid crystal display screen 10 for guaranteeing, be formed with the light transmission area (unidentified in the figure) that is used for making fingerprint detection light to see through on backlight unit 12, the light transmission area can be that backlight unit 12's relevant optics rete forms the region that is non-light-tight about the wave band of fingerprint detection light at the transmission path of detecting light and fingerprint detection light, fingerprint identification module 22 is located below backlight unit 12's light transmission area, so that fingerprint detection light sees through backlight unit 12 and transmits fingerprint identification module 22.

Specifically, in this embodiment, the light-transmitting area may be an area corresponding to a transmission path of the fingerprint detection light on the lcd screen 10, and the transmission waveband of the detection light covers the reflection waveband of the detection light, so that the detection light and the fingerprint detection light formed by the detection light on the finger can penetrate through the light-transmitting area of the backlight module 12.

It should be noted that, in practical application, can be as required to detect light source 21, backlight unit 12's light transmission area, relative position between fingerprint identification module 22 and the leaded light membrane 23 adjusts, but the detection light source 21 after the adjustment, backlight unit 12's light transmission area, the relative position between fingerprint identification module 22 and the leaded light membrane 23, the finger that the probe light that needs to satisfy the light emission end 234 transmission of leaded light membrane 23 can shine the fingerprint detection area top, and the fingerprint detection light that forms through finger reflection or transmission can get into fingerprint identification module 22 through backlight unit 12's light transmission area.

In order to avoid the interference of the detection light emitted by the detection light source 21 component on the display effect of the liquid crystal display screen 10, in this embodiment, the wavelength of the detection light or the fingerprint detection light is different from the wavelength of the backlight provided by the backlight module 12 for displaying the image, that is, the wavelength band of the detection light or the fingerprint detection light is different from the wavelength band of the backlight. Therefore, the utility model discloses fingerprint identification module 22 not only can utilize the fingerprint detection light that passes backlight unit 12 to realize optical fingerprint detection under the screen, but also can reduce the detecting light that light source 21 sent and cause the interference to the display effect of liquid crystal display screen 10, avoids influencing the display effect of image.

Further, in this embodiment, the detection light and/or the fingerprint detection light is infrared light or an optical signal with other wavelength outside the wavelength band of visible light and capable of realizing fingerprint identification, and the backlight provided by the backlight module 12 is visible light, so that the user cannot see or perceive the detection light for fingerprint identification through the liquid crystal display screen 10; correspondingly, the light guide film 23 is an infrared light guide film 23 or a film material which can guide and reflect light signals with other wavelengths outside the visible light wave band and capable of realizing fingerprint identification. In the present embodiment, the detection light and/or the fingerprint detection light may include, but is not limited to, infrared light. Therefore, in the present embodiment, the detection light is preferably infrared light, such as infrared light having a wavelength of 940 nm.

Specifically, the detection light source 21 may be an infrared light source, and the detection light emitted by the infrared light source is infrared light, so that the fingerprint detection light formed by the detection light that is irradiated to the finger and reflected, scattered, or transmitted by the finger is also infrared light. For example, the detection light source 21 may be an infrared light source such as an infrared lamp, an infrared Vertical Cavity Surface Emitting Laser (VCSEL), an infrared Laser Diode (Laser Diode), and the like, and in this embodiment, the type of the detection light source 21 is not further limited.

It should be noted that, in the embodiment, the infrared light emitted by the detection light source 21 is used as the detection light, and the penetration capability of the infrared light is stronger than that of the visible light, so that the signal of the fingerprint detection light penetrating through the liquid crystal display screen 10 and the backlight module 12 can be more effectively enhanced, thereby improving the fingerprint identification effect.

Fig. 6 is a schematic structural view of a light guide film according to a first embodiment of the present invention, fig. 7 is a schematic structural view of another light guide film according to a second embodiment of the present invention, fig. 8 is a schematic structural view of a light receiving end of a first light guide film according to a first embodiment of the present invention, fig. 9 is a schematic structural view of a light receiving end of a second light guide film according to a first embodiment of the present invention, fig. 10 is a schematic structural view of a light receiving end of a third light guide film according to a second embodiment of the present invention, fig. 11 is a schematic structural view of a light receiving end of a fourth light guide film according to a first embodiment of the present invention, fig. 12 is a schematic structural view of a light receiving end of a fifth light guide film according to a first embodiment of the present invention, fig. 13 is a schematic structural view of a light receiving end of a sixth light guide film according to a first embodiment of the present invention, fig. 14 is a schematic structural view of a light emitting end of a first light guide film according to a first, fig. 15 is a schematic view of a light emitting end structure of a second light guiding film according to an embodiment of the present invention.

Further, referring to fig. 6 and 7, an embodiment of the present invention provides a light guiding film 23, which includes a light guiding layer 231 for guiding light for light measurement and a reflecting layer 232 coated on the surface of the light guiding layer 231 and used for reflecting the detection light; the light receiving end 233 of the light guiding film 23 receives the probe light from the detection light source 21 and then guides the probe light through the light guiding layer 231, and further, in the transmission process of the probe light, the probe light is reflected through the reflecting layer 232 so that the probe light is transmitted to the light emitting end 234 in the light guiding film 23 and further irradiates the finger above the fingerprint detection area and forms the fingerprint detection light carrying the fingerprint information through the finger.

The light guiding performance of the light guiding layer 231 for detecting light is greater than the light guiding performance of the light guiding layer 231 for backlight (for example, visible light) of the liquid crystal display screen 10, and the reflection performance of the reflection layer 232 for detecting light is greater than the reflection performance of the reflection layer 232 for backlight of the liquid crystal display screen 10, so as to enhance the guiding effect of the light guiding film 23 for detecting light.

For example, in this embodiment, the reflection layer 232 may be coated on the surface of the light guide layer 231 in a film coating manner to form the light guide film 23, or the reflection layer 232 may be coated on the surface of the light guide layer 231 in a stacking manner to form the light guide film 23, that is, the reflection layer 232 is fixed on the surface of the light guide layer 231 by pressing or other manners on the surface of the reflection layer 232 on which the light guide layer 231 is disposed, in this embodiment, the forming manner of the light guide film 23 is not further limited.

Specifically, in this embodiment, the light guide layer 231 may be made of a material having a high light guide performance for the probe light, wherein the light guide layer 231 may be made of polycarbonate (PC for short), polyethylene terephthalate (PET for short, commonly known as polyester resin) or other materials having a high light guide performance for the probe light, that is, in this embodiment, the light guide layer 231 includes but is not limited to the light guide film 23 layer made of PC or PET. The reflective layer 232 may be made of a material having high reflectivity to the detection light, wherein the reflective layer 232 may be made of silver, aluminum or other materials having high reflectivity to the detection light, i.e., in this embodiment, the reflective layer 232 includes, but is not limited to, a film layer made of silver or aluminum.

Further, referring to fig. 6 to 15, in the present embodiment, the reflection layer 232 is respectively provided with an avoiding region 235 at the light receiving end 233 and the light emitting end 234, so that a part of the light guide layer 231 is located on the surface of the light guide film 23, the light guide layer 231 located on the surface of the light guide film 23 is respectively provided with a light receiving unit 2331 and a light emitting unit 2341 at positions close to the detection light source 21 and the fingerprint detection region, wherein the light receiving unit is arranged opposite to the light emitting surface of the detection light source 21, and is configured to receive the detection light emitted by the detection light source 21 and guide the detection light to the light emitting unit 2341 through the light guide film 23, and the detection light is emitted through the light emitting unit 2341 and irradiates the finger above the fingerprint identification region on the liquid crystal display screen 10 and forms the fingerprint detection light carrying the fingerprint information through the finger.

For example, referring to fig. 6 to 15, the avoiding region 235 of the reflective layer 232 at the light receiving end 233 and the light emitting end 234 may be a local avoiding structure of the reflective layer 232 relative to the light guiding layer 231, so that at least a portion of the light guiding layer 231 at the light receiving end 233 and the light emitting end 234 is not covered by the reflective layer 232, and the light guiding layer 231 not covered by the reflective layer 232 forms a light receiving unit 2331 and a light emitting unit 2341 at the light receiving end 233 and the light emitting end 234, respectively.

In the present embodiment, the size and shape of the avoiding region 235 of the reflective layer 232 at the light receiving end 233 and the light emitting end 234 are not further limited, and in the present embodiment, the avoiding region 235 only needs to satisfy the requirement that the detection light can substantially enter or exit from the light guiding film 23.

Specifically, referring to fig. 6 to 15, in the present embodiment, the light emitting surface of the detection light source 21 is located on one side of the light guiding film 23 and is disposed opposite to the light receiving unit 2331, that is, the light guiding layer 231 of the light receiving end 233 is not wrapped by the reflection layer 232 and is located on the surface of the light guiding film 23 (as shown in the arrangement manner of the detection light source 21 in fig. 8, 10 and 11);

alternatively, the light emitting surface of the detection light source 21 is covered in the light guide film 23 and is disposed opposite to the light receiving unit 2331, wherein the detection light source 21 may be entirely covered in the light guide film 23 or partially covered in the light guide film 23 (as in the arrangement of the detection light source 21 shown in fig. 6, 7, 9, 12 and 13). In this embodiment, the detection light source 21 can be wrapped in the light guide film 23 through the reflection layer 232 or the light guide layer 231 of the light guide film 23, and in this embodiment, the setting mode of the detection light source 21 is not further limited, and only the light receiving end 233 of the light guide film 23 needs to be able to receive the probe light emitted by the detection light source 21 and guide the probe light to the light emitting end 234.

Further, in order to wrap the detection light source 21, as shown in fig. 6 to fig. 15, an accommodating space 239 for accommodating at least a part of the detection light source 21 is provided in the light guide layer 231 or the reflection layer 232. For example, the receiving space 239 may be a notch or a recess formed on the light guide layer 231 and capable of receiving at least a portion of the detection light source 21, or the receiving space 239 may be a notch or a recess formed on the reflection layer 232 and exposed to the light guide layer 231 and capable of receiving at least a portion of the detection light source 21.

Referring to fig. 6 to 15, in the present embodiment, the light receiving unit 2331 and the light emitting unit 2341 may be located on the same surface or both surfaces of the light guiding film 23, so that the light guiding film 23 is more diversified in arrangement in the mobile phone 100, and the light guiding film 23 has wider applicability, so as to better utilize the inner space of the mobile phone 100 to guide the detection light to the fingerprint identification area, thereby realizing the fingerprint identification under the screen.

Specifically, in the present embodiment, since the light guide film 23 can guide the probe light emitted by the detection light source 21 to a certain extent, the detection light source 21 may be a detection light source that emits light in a positive direction (such as the light emission modes shown in fig. 6, 7, and 10 to 13) or in a side-emission direction (such as the light emission modes shown in fig. 8 and 9). In practical applications, different light guide films 23 can be matched according to different light emitting modes of the detection light source 21, so as to achieve the purpose of detecting the light. In the present embodiment, the light emission method of the detection light source 21 is not further limited.

Fig. 16 is the embodiment of the present invention provides a light emitting end structure schematic diagram of a third light guiding film, fig. 17 is the embodiment of the present invention provides a light emitting end structure schematic diagram of a fourth light guiding film, fig. 18 is the embodiment of the present invention provides a light emitting end structure schematic diagram of a fifth light guiding film, fig. 19 is the embodiment of the present invention provides a light emitting end structure schematic diagram of a sixth light guiding film.

In order to adjust the emission angle of the probe light, referring to fig. 17 and 18, as a possible implementation manner, in the present embodiment, the diffusion particles 236 are disposed in the light guide layer 231 at the light emitting unit 2341, and the diffusion particles 236 are used to adjust the emission angle of the probe light, so that the probe light irradiates the fingerprint detection area, so as to enhance the intensity of the probe light for fingerprint identification, thereby improving the fingerprint identification effect. The diffusion particles 236 may be filled in the light guide layer 231. Illustratively, the diffusing particles 236 may be particles capable of adjusting the emission angle of the detection light, such as silicon dioxide or other particles capable of adjusting the emission angle of the detection light, i.e., the diffusing particles 236 include, but are not limited to, silicon dioxide.

As another possible implementation manner, referring to fig. 16 and 19, in the present embodiment, the surface of the light guiding layer 231 at the light emitting unit 2341 is provided with the optical element 237, and the optical element 237 is used to adjust the emitting angle of the probe light, so that the probe light irradiates the fingerprint detection area, so as to enhance the intensity of the probe light for fingerprint identification, thereby improving the fingerprint identification effect. Illustratively, the optical element 237 may be a small-sized convex mirror or other optical elements capable of adjusting the emitting angle of the probe light, i.e., the optical element 237 includes, but is not limited to, a convex mirror. The optical element 237 may be bonded to the surface of the light guide layer 231 by an optical adhesive that allows probe light to pass therethrough. In this embodiment, the avoiding region 235 of the light emitting end 234 may just meet the setting of the optical element 237, or the avoiding region 235 of the light emitting end 234 may be larger than the optical element 237, and in this embodiment, the shape and size of the avoiding region 235 of the light emitting end 234 will not be further described.

Alternatively, in the present embodiment, the diffusing particles 236 may be disposed in the light guiding layer 231 at the light emitting end 234, and the optical element 237 may be disposed on the surface of the light guiding layer 231 to further enhance the intensity of the detecting light for fingerprint identification.

Referring to fig. 2 and 3, in the present embodiment, the lcd screen 10 includes a liquid crystal panel 112 and a protective cover 111, the liquid crystal panel 112 is located between the protective cover 111 and the backlight module 12, and the light guiding film 23 includes a light receiving end 233, a light emitting end 234, and a light guiding film body 238 located between the light receiving end 233 and the light emitting end 234; the light guiding film body 238 may be located under the edge region (i.e. the edge extension 1111) of the protective cover 111, and is disposed side by side (i.e. not overlapping) with the liquid crystal panel 112 and the backlight module 12 and located at the same side of the backlight module 12 and the liquid crystal panel 112. In the present embodiment, the light guiding film 23 is an integrated structure formed by the light receiving end 233, the light emitting end 234 and the light guiding film body 238.

In order to distinguish the circuit boards in the mobile phone 100, in this embodiment, the circuit board of the liquid crystal panel 112 is defined as a first circuit board 1121, and the circuit board of the electronic device is defined as a second circuit board 40, that is, a Printed Circuit Board (PCB) of the electronic device, such as the mobile phone 100, is defined as the second circuit board 40, where the second circuit board 40 may be a main board or a sub-board of the mobile phone 100, and the detection light source 21 is attached to the first circuit board 1121, or the detection light source 21 is attached to the second circuit board 40.

On the basis of the light guide film 23, in the following embodiment, several possible arrangement modes of the light guide film 23 when the detection light source 21 is attached to the first circuit board 1121 will be further described.

Referring to fig. 2 and fig. 3, in the embodiment, the detection light source 21 is attached to an outer surface of the first circuit board 1121 and is located below the backlight module 12, and the first circuit board 1121 covers the same side of the liquid crystal panel 112 and the backlight module 12 and is electrically connected to the liquid crystal panel 112. Because the light receiving end 233 of the light guiding film 23 is disposed opposite to the light emitting surface of the detection light source 21, the light receiving end 233 of the light guiding film 23 is attached to the outer surface of the first circuit board 1121 and is located below the backlight module 12 for receiving and guiding the probe light emitted by the detection light source 21 into the light guiding film 23, and the probe light is guided to the light emitting end 234 through the light guiding film 23 and irradiates the finger above the fingerprint identification area for fingerprint identification.

As a possible implementation manner, referring to fig. 2, the light emitting end 234 is attached to the first circuit board 1121 and extends toward the protective cover 111, so that the light emitting end 234 is located between the protective cover 111 and the liquid crystal panel 112, that is, the light emitting end 234 is located in an intermediate layer between the protective cover 111 and the liquid crystal panel 112, so as to shorten a linear distance from the light emitting end 234 to the fingerprint identification region, thereby reducing attenuation of the detection light during transmission and improving the fingerprint identification effect.

As another possible implementation manner, referring to fig. 3, the light emitting end 234 is located on the first circuit board 1121 near the bending portion of the protective cover 111 to avoid blocking of the detection light by the liquid crystal panel 112, so that at least a portion of the detection light emitted by the light emitting end 234 can be irradiated onto a finger above the fingerprint detection area, thereby implementing the fingerprint identification area.

It should be noted that, in order to make the detecting light emitted from the light emitting unit 2341 irradiate the finger above the fingerprint identification area, the light emitting unit 2341 of the light emitting end 234 is required to be disposed on the side of the light emitting end 234 close to the fingerprint identification area.

Referring to fig. 2 and 3, the light guide film 23 and the first circuit board 1121 are bent synchronously, so that the mobile phone 100 has a more compact structure, the internal space of the mobile phone 100 is saved as much as possible, the width of the chin area is reduced, and the light guide film 23 can be supported and fixed by the first circuit board 1121. In the present embodiment, the first Circuit board 1121 is a Flexible Printed Circuit (FPC).

Specifically, referring to fig. 2 and fig. 3, in the embodiment, the detection light source 21 and the liquid crystal panel 112 share one first circuit board 1121 to be connected to an external circuit, or the detection light source 21 is electrically connected to the first circuit board 1121 through a third circuit board 211 (not shown), so that power supply to the detection light source 21 and the liquid crystal panel 112 is realized. In this embodiment, the third circuit board 211 is a circuit board electrically connected to the detection light source 21, and may be an FPC board, a PCB board, or a circuit board that is at least partially bendable.

In order to facilitate the bending of the light guiding film 23, the light guiding film 23 is of an at least partially bendable structure, that is, the light guiding film 23 may be of a partially bendable structure or an entirely bendable structure.

In order to avoid the influence of other electronic devices in the electronic device on the liquid crystal display screen 10, referring to fig. 2 to 5, an isolation layer 1122 is further disposed on an outer surface of the first circuit board 1121, and the liquid crystal panel 112 is isolated and protected by the isolation layer 1122, so as to avoid the influence of the other electronic devices on the electric field of the liquid crystal panel 112, thereby affecting the touch effect of the liquid crystal display screen 10. Specifically, referring to fig. 5, the light guiding film 23 or the light receiving end 233 (in this embodiment, the light guiding film 23) is attached to the outer surface of the first circuit board 1121 through the isolation layer 1122, that is, the isolation layer 1122 is located between the light guiding film 23 and the first circuit board 1121, and plays a certain role in supporting and guiding the light guiding film 23 through the first circuit board 1121.

Alternatively, referring to fig. 4, in the embodiment, the isolation layer 1122 is provided with an avoiding space (not labeled in the figure) at a position opposite to the light guiding film 23 or the light receiving end 233, so that the light guiding film 23 or the light receiving end 233 is directly attached to the outer surface of the first circuit board 1121, when the fingerprint recognition under the screen is realized, the light guiding film 23 or the light receiving end 233 is embedded in the isolation layer 1122 through the provision of the avoiding space on the isolation layer 1122, and compared with the prior art in which the detection light source 21 is disposed in the chin area, the width of the chin area can be further reduced or not increased, thereby being beneficial to improving the screen occupation ratio of the electronic device such as the mobile phone 100.

For example, in the present embodiment, the avoiding space on the isolation layer 1122 may be a recessed structure or a notch formed in the isolation layer 1122 at a position opposite to the light guide film 23 or the light receiving end 233, and the light guide film 23 or the light receiving end 233 is embedded in the isolation layer 1122 through the recessed structure or the notch.

Specifically, in this embodiment, the isolation layer 1122 may be a copper foil or another dielectric layer capable of performing an isolation function, that is, in this embodiment, the isolation layer 1122 includes, but is not limited to, a copper foil.

It should be noted that, since the light emitting end 234 is located on the first circuit board 1121 and attached to the first circuit board 1121, in this embodiment, the whole light guiding film 23 is attached to the surface of the first circuit board 1121. For example, in the present embodiment, the attaching manner of the light guiding film 23 and the first circuit board 1121 includes, but is not limited to, adhesion.

In order to improve the transmittance of the detection light on the protective cover 111, in the present embodiment, referring to fig. 2 and 3, the lower surface of the protective cover 111 at the position opposite to the light emitting end 234 is coated with infrared-transmitting ink 1112.

In order to fix the fingerprint identification module 22, referring to fig. 2 and 3, the fingerprint identification module 22 may be attached to the support plate 32 of the middle frame 30 of the mobile phone 100 by bonding, screwing or welding, so that the fingerprint identification module 22 is located under the lcd screen 10. In order to facilitate the fingerprint detection light that sees through backlight unit 12 to pass through center 30 and get into fingerprint identification module 22, center 30's backup pad 32 is equipped with first trompil 321 in the relative region with fingerprint identification module 22, and first trompil 321 is used for making the fingerprint detection light that sees through backlight unit 12 to transmit to fingerprint identification module 22 through center 30, and wherein, center 30 is still including setting up the frame 31 of backup pad 32 marginal area.

Specifically, fingerprint identification module 22 can wholly laminate under the lower surface of center 30 and be located the peripheral region of first trompil 321, when the backup pad 32 of center 30 has certain thickness, fingerprint identification module 22 can partially accept in first trompil 321 to make fingerprint identification module 22 be located under liquid crystal display screen 10 completely, in this embodiment, do not do further the restriction to fingerprint identification module 22's setting mode, as long as satisfy fingerprint detection light can pass through first trompil 321 and get into fingerprint identification module 22 can.

Wherein, the shape and the size of first trompil 321 can satisfy that fingerprint detection light can basically see through to avoid influencing the acquirement of fingerprint image because fingerprint detection light can't normally see through center 30, in this embodiment, use the receiving light path of fingerprint identification module 22 as the standard to the size of first trompil 321.

It should be noted that, in this embodiment, the fingerprint identification module 22 may refer to the structure of the fingerprint identification module 22 in the prior art, and further details of the structure of the fingerprint identification module 22 are not described in the prior art.

Specifically, referring to fig. 2 and 3, the backlight module 12 includes an optical film 121 for allowing the fingerprint detection light to pass through, and a steel plate 122 for supporting the optical film 121, the fingerprint identification module 22 is disposed below the steel plate 122, the steel plate 122 is provided with a second opening 1221 in a corresponding area with the fingerprint identification module 22, the second opening 1221 is used for allowing the fingerprint detection light passing through the optical film 121 to pass through the steel plate 122 and be transmitted to the fingerprint identification module 22, and the second opening 1221 corresponds to the light transmission area. Therefore, the shape and size of the opening of the second opening 1221 can satisfy the requirement that the fingerprint detection light can penetrate through the opening, so as to avoid the influence on the acquisition of the fingerprint image due to the failure of the fingerprint detection light to penetrate through the steel plate 122. In this embodiment, the size of the second opening 1221 is based on the receiving optical path of the fingerprint identification module 22.

In the utility model, the detection light source is positioned below the liquid crystal display screen, and the detection light emitted by the detection light source is guided to the light emitting end through the light guide film, so that the detection light irradiates the finger above the fingerprint detection area through the light emitting end and forms fingerprint detection light carrying fingerprint information; the fingerprint identification module is located under the liquid crystal display screen to a fingerprint image that the fingerprint that is used for receiving and sees through the light transmission zone territory detects the light in order to acquire the finger, thereby when realizing fingerprint identification under the screen, help reducing the regional width of chin of current electronic equipment, thereby improve electronic equipment's screen and account for than.

Example two

Fig. 20 is a schematic structural diagram of a first mobile phone equipped with an underscreen fingerprint identification device provided by the second embodiment of the present invention, and fig. 21 is a schematic partial structural diagram of a second mobile phone equipped with an underscreen fingerprint identification device provided by the second embodiment of the present invention.

On the basis of the above embodiments, referring to fig. 20 and 21, in the present embodiment, the light receiving end 233 of the light guiding film 23 is attached to the surface of the first circuit board 1121 and located below the lcd screen 10, the light receiving end 233 is disposed opposite to the light emitting surface of the detecting light source 21, and the difference between the present embodiment and the previous embodiment is that the light emitting end 234 is attached to the inner wall of the middle frame 30 of the electronic device, and extends along the inner wall of the middle frame 30 toward the protecting cover 111, so that at least a portion of the probe light emitted from the light emitting end 234 can be irradiated onto the finger above the fingerprint detection area, therefore, when fingerprint identification under the screen is realized, compared with the prior art that the detection light source 21 is arranged in the chin area, the width of the chin area of the electronic equipment such as the mobile phone 100 can be reduced, and the screen occupation ratio of the electronic equipment is improved.

In this embodiment, referring to fig. 20 and 21, the mobile phone 100 may include a liquid crystal display screen 10 and a back cover (not labeled in the figures), the middle frame 30 is installed between the liquid crystal display screen 10 and the back cover, and the liquid crystal display screen 10 is located in the middle frame 30. Specifically, other components inside the cellular phone 100, such as the second circuit board 40 (i.e., PCB board) and the battery of the cellular phone 100, may be mounted on the middle frame 30. Specifically, the connection manner of the middle frame 30 and the liquid crystal display screen 10 and the rear cover may be clamping, bonding or connection through a fastener, in this embodiment, the middle frame 30 may include a support plate 32 and a frame 31 located in an edge area of the support plate 32, the frame 31 may vertically extend from the edge area of the support plate 32 to form a plurality of side walls, and the plurality of side walls and the support plate 32 cooperate to form an accommodating space 239 for accommodating and supporting the liquid crystal display screen 10.

In this embodiment, the arrangement of the detection light source 21 and the light guide film 23 may refer to the description of the light guide film 23 and the detection light source 21 in the first embodiment, and in this embodiment, further description thereof is omitted.

Specifically, referring to fig. 20 and 21, in the present embodiment, the light emitting end 234 is attached to the inner wall of the frame 31 of the middle frame 30, wherein the attaching manner of the light emitting end 234 to the frame 31 includes, but is not limited to, bonding.

As shown in fig. 20, a supporting structure 311 for supporting the protective cover 111 is generally disposed on the frame 31 as a possible implementation manner. The light emitting end 234 may be located at one side of the supporting structure 311, or, as another possible implementation, as shown in fig. 21, the light emitting end 234 may be attached between the protective cover 111 and the supporting surface 312 of the supporting structure 311. In this embodiment, the position of the light emitting end 234 is not further limited, and in this embodiment, it only needs to be satisfied that the detection light emitted by the light emitting end 234 can irradiate the finger above the fingerprint identification area and form the fingerprint detection light carrying the fingerprint identification by the finger.

Specifically, in this embodiment, the light emitting end 234 directly contacts the surface of the inner wall of the frame 31, or an accommodating space (not shown) for accommodating the light emitting end 234 is provided at a position of the frame 31 opposite to the light emitting end 234, so that at least a portion of the light emitting end 234 is embedded in the frame 31, and the width of the chin area or the thickness of the electronic device is further reduced. In this embodiment, the light guiding film body 238 can be attached to the inner wall of the frame 31. For example, the accommodating space may be a recessed structure or a notch opened on the frame 31 at a position opposite to the light emitting end 234 or the light guiding film 23, and the light emitting end 234 or the light guiding film 23 is embedded in the frame 31 through the recessed structure or the notch.

In this embodiment, referring to fig. 20, when the detection light source 21 is located below the isolation layer 1122 on the outer surface of the first circuit board 1121, the isolation layer 1122 may be provided with a through hole at a position opposite to the detection light source 21, so that the package structure of the detection light source 21 is embedded in the isolation layer 1122 and attached to the first circuit board 1121. At this time, the detection light source 21 may emit light in the form of side light emission so as not to affect the emission of the detection light source 21.

The utility model discloses in, be located under the liquid crystal display screen with the testing light source, the probing light that will test the light source transmission through the leaded light membrane guides to the light emission end to make the probing light shine the finger of fingerprint detection area top through the light emission end and form the fingerprint detection light that carries fingerprint information, when realizing that the screen is lower the fingerprint discernment, help reducing the regional width of chin of current electronic equipment, thereby improve electronic equipment's screen and account for than.

EXAMPLE III

Fig. 22 is a schematic structural diagram of a first mobile phone equipped with an underscreen fingerprint identification device provided by the third embodiment of the present invention, and fig. 23 is a schematic partial structural diagram of a second mobile phone equipped with an underscreen fingerprint identification device provided by the third embodiment of the present invention.

In addition to the first and second embodiments, the difference between the first and second embodiments is that in the present embodiment, referring to fig. 22 and 23, in the present embodiment, the detection light source 21 is attached to the second circuit board 40, the light receiving end 233 of the light guiding film 23 is attached to the second circuit board 40, and the light emitting end 234 is attached to the inner wall of the middle frame 30 of the electronic device, such as the mobile phone 100, and the inner wall of the middle frame 30 extends toward the protective cover 111, so that at least a part of the detection light emitted from the light emitting end 234 can be irradiated onto the finger above the fingerprint detection area. The light guide film 23 is attached to the second circuit board 40 and/or the middle frame 30 in a manner including, but not limited to, adhesion.

Specifically, the detection light source 21 may be directly attached to the second circuit board 40, or the detection light source 21 may be electrically connected to the second circuit board 40 through a third circuit board 211 (not labeled in the figure), so as to supply power to the detection light source 21. The attaching manner of the detection light source 21 and the second circuit board 40 includes, but is not limited to, soldering or bonding.

Further, referring to fig. 22 and 23, in the present embodiment, the light emitting end 234 is attached to the inner wall of the rim 31 of the middle frame 30. In this embodiment, the structure of the light emitting end 234 attached to the inner wall of the frame 31 may refer to the description of the attachment manner of the light emitting end 234 in the second embodiment, and in this embodiment, further description thereof is omitted.

Specifically, referring to fig. 22, in the present embodiment, the supporting plate 32 of the middle frame 30 is horizontally disposed between the liquid crystal display screen 10 and the second circuit board 40 to separate the liquid crystal display screen 10 from the second circuit board 40, the supporting plate 32 is provided with a third opening 322 at a position opposite to the light guiding film 23, and the third opening 322 is used for enabling the light guiding film 23 to pass through the supporting plate 32 and to be attached to the second circuit board 40. In this embodiment, the structure and size of the third opening 322 are not further described in this embodiment, and it is only necessary that the light guiding film 23 can pass through the supporting plate 32 and be attached to the second circuit board 40.

Example four

On the basis of the first embodiment to the third embodiment, the embodiment of the utility model provides a liquid crystal display fingerprint identification system is applied to electronic equipment, and it includes liquid crystal display screen 10 and underscreen fingerprint identification device 20 and leaded light membrane 23 as described in any one of the above embodiments.

Specifically, fingerprint identification device 20 is including detecting light source 21 and fingerprint identification module 22 under the screen, the utility model discloses in, will detect light source 21 and be located liquid crystal display screen 10 under, detect light source 21 is used for launching the probe light, and the finger of fingerprint detection area top is shone in the guide of probe light through leaded light membrane 23 to form the fingerprint detection light that carries fingerprint information. Specifically, the detection light emitted by the detection light source 21 is guided to the light emitting end 234 through the light guide film 23, so that the detection light irradiates the finger above the fingerprint detection area through the light emitting end 234 and forms fingerprint detection light carrying fingerprint information, and when the fingerprint identification under the screen is realized, the width of the chin area of the existing electronic equipment is favorably reduced, so that the screen occupation ratio of the electronic equipment is improved.

In the description of the present invention, it is to be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically stated otherwise.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. An under-screen fingerprint identification device is applied to electronic equipment with a liquid crystal display screen, and is characterized in that a fingerprint detection area of the under-screen fingerprint identification device is at least partially positioned in a display area of the liquid crystal display screen; the under-screen fingerprint identification device comprises a detection light source and a fingerprint identification module, wherein the detection light source and the fingerprint identification module are both positioned below the liquid crystal display screen;

2. The device according to claim 1, wherein the light guiding film is a film material structure having light guiding and reflecting effects on the probe light.

3. The device according to claim 2, wherein the lcd screen comprises a backlight module, the backlight module is formed with a light-transmitting area for transmitting the fingerprint detection light, and the fingerprint identification module is disposed under the light-transmitting area of the backlight module, so that the fingerprint detection light is transmitted to the fingerprint identification module through the backlight module.

4. The device according to claim 3, wherein the wavelength of the detection light or the fingerprint detection light is different from the wavelength of the backlight provided by the backlight module for displaying the image.

5. The device according to claim 4, wherein the detection light and/or the fingerprint detection light is infrared light, the backlight module provides visible light, and the light guide film is an infrared light guide film.

6. The device according to claim 1, wherein the light guide film comprises a light guide layer for guiding the detection light and a reflection layer coated on the surface of the light guide layer for reflecting the detection light;

7. The device according to claim 6, wherein the reflective layer is provided with an avoiding region at the light receiving end and the light emitting end, respectively, so that a portion of the light guiding layer is located on the surface of the light guiding film, and the light guiding layer located on the surface of the light guiding film forms a light receiving unit and a light emitting unit near the detection light source and the fingerprint detection region, respectively.

8. The device for identifying fingerprints of claim 7, wherein a light emitting surface of the detection light source is located on one side of the light guide film and is opposite to the light receiving unit;

9. The device of claim 8, wherein a receiving space for receiving at least a portion of the detection light source is formed in the light guide layer or the reflective layer.

10. The device according to claim 7, wherein diffusion particles are disposed in the light guide layer at the light emitting unit, and the diffusion particles are used for adjusting an emission angle of the probe light so that the probe light irradiates the fingerprint detection area;

11. The device of claim 6, wherein the light receiving unit and the light emitting unit are located on the same side or both sides of the light guiding film.

12. The underscreen fingerprint identification device of claim 1, wherein the detection light source is a positive or side-emitting detection light source.

13. The device for identifying fingerprints of any one of claims 1 to 12, wherein the liquid crystal display screen comprises a liquid crystal panel and a protective cover plate, the liquid crystal panel is located between the protective cover plate and the backlight module, and the light guiding film comprises the light receiving end, the light emitting end and a light guiding film body located between the light receiving end and the light emitting end; the light guide film body is located below the edge area of the protective cover plate and located on the same side of the backlight module and the liquid crystal panel.

14. The device according to claim 13, wherein the circuit board of the liquid crystal panel is a first circuit board, and the circuit board of the electronic device is a second circuit board, and wherein the detection light source is attached to the first circuit board, or the detection light source is attached to the second circuit board.

15. The device according to claim 14, wherein the detection light source is attached to an outer surface of the first circuit board and located below the backlight module, the first circuit board is wrapped around the same side of the liquid crystal panel and the backlight module and electrically connected to the liquid crystal panel, and the light receiving end is attached to an outer surface of the first circuit board.

16. The device according to claim 15, wherein the light emitting end is attached to the first circuit board and extends toward the protective cover plate, so that the light emitting end is located between the protective cover plate and the liquid crystal panel;

17. The underscreen fingerprint identification device of claim 16, wherein the light directing film is bent in synchronization with the first circuit board.

18. The device according to claim 15, wherein the light emitting end is attached to an inner wall of a middle frame of the electronic apparatus and extends along the inner wall of the middle frame toward the protective cover, so that at least a portion of the probe light emitted from the light emitting end can be irradiated onto a finger above the fingerprint detection area.

19. The device of claim 18, wherein the light emitting end is attached to an inner wall of a border of the middle frame.

20. The device of claim 19, wherein the frame is provided with a support structure for supporting the protective cover, and the light emitting end is located on one side of the support structure, or the light emitting end is attached between the protective cover and a support surface of the support structure.

21. The device according to claim 20, wherein the light emitting end is directly attached to the surface of the inner wall of the frame, or an accommodating space for accommodating the light emitting end is provided at a position of the frame opposite to the light emitting end, so that at least a part of the light emitting end is embedded in the frame.

22. The device for identifying fingerprints of claim 15, wherein an isolation layer is further arranged on the outer surface of the first circuit board, and the light guide film or the light receiving end is attached to the outer surface of the first circuit board through the isolation layer;

23. The device according to claim 15, wherein the detection light source and the liquid crystal panel share one first circuit board to be connected to an external circuit, or the detection light source is electrically connected to the first circuit board through a third circuit board.

24. The device according to claim 14, wherein the light source is attached to the second circuit board, the light receiving end is attached to the second circuit board, and the light emitting end is attached to an inner wall of a middle frame of the electronic apparatus and extends along the inner wall of the middle frame toward the protective cover plate, so that at least a portion of the probe light emitted from the light emitting end can be irradiated onto a finger above the fingerprint detection area.

25. The device of claim 24, wherein the light emitting end is attached to an inner wall of a rim of the middle frame.

26. The device of claim 25, wherein the frame is provided with a support structure for supporting the protective cover, and the light emitting end is located on one side of the support structure, or the light emitting end is attached between the protective cover and a support surface of the support structure.

27. The device of claim 25, wherein the light emitting end is directly attached to the inner wall of the rim, or an accommodating space for accommodating the light emitting end is provided at a position of the rim opposite to the light emitting end, so that at least a part of the light emitting end is embedded in the rim.

28. The device of claim 25, wherein the light guiding film body of the light guiding film is attached to the middle frame, the light receiving end passes through a supporting plate of the middle frame and is attached to the second circuit board, and the frame surrounds an edge region of the supporting plate.

29. The device of claim 28, wherein the supporting plate is horizontally disposed between the lcd screen and the second circuit board, and the supporting plate is provided with a third opening at a position opposite to the light guiding film, wherein the third opening is used for allowing the light guiding film to pass through the supporting plate and be attached to the second circuit board.

30. The underscreen fingerprint identification device of claim 1 wherein the light directing film is at least partially bendable.

31. A liquid crystal display fingerprint identification system, applied to an electronic device, comprising a liquid crystal display screen, and the under-screen fingerprint identification device and the light guide film of any one of claims 1 to 30, wherein the under-screen fingerprint identification device comprises a detection light source for emitting a detection light, and the detection light irradiates a finger above a fingerprint detection area through the guidance of the light guide film to form a fingerprint detection light carrying fingerprint information.

32. An electronic device comprising the liquid crystal display fingerprinting system of claim 31.

33. A light guide film is suitable for electronic equipment with a liquid crystal display screen and an under-screen fingerprint identification device, and is characterized in that the under-screen fingerprint identification device comprises a detection light source and a fingerprint identification module, wherein the detection light source and the fingerprint identification module are both positioned below the liquid crystal display screen;

the detection light source is used for emitting detection light, and the detection light irradiates the finger above the fingerprint detection area through the guidance of the light guide film so as to form fingerprint detection light carrying fingerprint information; the light receiving end of the light guide film is arranged opposite to the light emitting surface of the detection light source, and the light emitting end of the light guide film is arranged close to the fingerprint detection area of the liquid crystal display screen; the fingerprint identification module is used for receiving the fingerprint detection light penetrating through the liquid crystal display screen so as to acquire a fingerprint image of the finger.

34. The light guide film according to claim 33, wherein the light guide film comprises a light guide layer for guiding the detection light and a reflective layer coated on a surface of the light guide layer for reflecting the detection light;

35. The light directing film of claim 34, wherein the reflective layer is provided with an escape area at the light receiving end and the light emitting end, respectively, so that a portion of the light directing layer is located on the surface of the light directing film, and the light directing layer located on the surface of the light directing film forms a light receiving unit and a light emitting unit near the detection light source and the fingerprint detection area, respectively.

36. The light guide film of claim 35, wherein the light emitting surface of the detection light source is located on one side of the light guide film and opposite to the light receiving unit, or the light emitting surface of the detection light source is wrapped in the light guide film and opposite to the light receiving unit.

37. The light directing film of claim 36, wherein a receiving space is provided in the light directing layer or the reflective layer for receiving at least a portion of the detection light source.

38. The light guiding film as claimed in claim 37, wherein diffusing particles are provided in the light guiding layer at the light emitting unit, the diffusing particles being configured to adjust an emission angle of the probe light so that the probe light is irradiated to the fingerprint detection area;

39. The light directing film of claim 34, wherein the light receiving unit and the light emitting unit are located on the same side or on both sides of the light directing film.