WO2021097639A1 - Appareil de reconnaissance d'empreintes digitales dans l'affichage, système de reconnaissance d'empreintes digitales lcd, dispositif électronique et film de guidage de lumière - Google Patents

Appareil de reconnaissance d'empreintes digitales dans l'affichage, système de reconnaissance d'empreintes digitales lcd, dispositif électronique et film de guidage de lumière Download PDF

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Publication number
WO2021097639A1
WO2021097639A1 PCT/CN2019/119324 CN2019119324W WO2021097639A1 WO 2021097639 A1 WO2021097639 A1 WO 2021097639A1 CN 2019119324 W CN2019119324 W CN 2019119324W WO 2021097639 A1 WO2021097639 A1 WO 2021097639A1
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WO
WIPO (PCT)
Prior art keywords
light
light guide
detection
fingerprint
guide film
Prior art date
Application number
PCT/CN2019/119324
Other languages
English (en)
Chinese (zh)
Inventor
张胜斌
熊峰
刘文拯
Original Assignee
深圳市汇顶科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to PCT/CN2019/119324 priority Critical patent/WO2021097639A1/fr
Priority to CN201980004177.XA priority patent/CN111095276B/zh
Publication of WO2021097639A1 publication Critical patent/WO2021097639A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/141—Control of illumination

Definitions

  • This application relates to the field of fingerprint identification technology, and in particular to an under-screen fingerprint identification device, a liquid crystal display screen fingerprint identification system, electronic equipment, and a light guide film.
  • the infrared light source is usually set in the chin area of an electronic product such as a mobile phone through a flexible circuit board to perform infrared supplementary light, so as to realize the fingerprint recognition function under the screen.
  • the chin area of the mobile phone is below the edge area of the protective cover of the LCD screen, which is often used as an area for liquid crystal wiring, used for the bending of the circuit board of the liquid crystal display screen and the pressing of the liquid crystal display screen. Since the infrared light source is set in the chin area of the electronic product through the flexible circuit board, it will occupy the width of the chin area of the mobile phone, causing the chin area of the mobile phone screen to widen, thereby affecting the overall screen-to-body ratio of the mobile phone, making the screen-to-body ratio of the mobile phone significantly lower .
  • 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 that the infrared light source is attached to the middle frame of an electronic product such as a mobile phone are all limit size requirements, it is difficult to achieve narrower , So it will cause the chin area of the electronic product to be wider.
  • the present application provides an under-screen fingerprint identification device, a liquid crystal display screen fingerprint identification system, electronic equipment, and a light guide film, which help reduce the width of the chin area of existing electronic products.
  • the present application provides an under-screen fingerprint identification device, which is applied to an electronic device with a liquid crystal display screen, and the fingerprint detection area of the under-screen fingerprint identification device is at least partially located in the display area of the liquid crystal display screen;
  • the under-screen fingerprint identification device includes a detection light source and a fingerprint identification module, and the detection light source and the fingerprint identification module are both located under the liquid crystal display screen;
  • the detection light source is used to emit detection light, and the detection light is guided by the light guide film to illuminate the finger above the fingerprint detection area to form a fingerprint detection light carrying fingerprint information; wherein the light of the light guide film
  • the receiving end 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 to receive the fingerprint that passes through the liquid crystal display screen The light is detected to obtain a fingerprint image of the finger.
  • the light guide film is a film structure that has light guide and reflection functions for the probe light.
  • the liquid crystal display screen includes a backlight module, a light-transmitting area for transmitting the fingerprint detection light is formed on the backlight module, and the fingerprint identification module is located at Under the light-transmitting area of the backlight module, the fingerprint detection light is transmitted to the fingerprint identification module through the backlight module.
  • the detection light or the fingerprint detection light and the backlight provided by the backlight module for displaying images have different wavelengths.
  • the detection light and/or the fingerprint detection light is infrared light
  • the backlight provided by the backlight module is visible light
  • the light guide film is an infrared light guide film.
  • the light guide film includes a light guide layer for guiding the detection light and a light guide layer coated on the surface of the light guide layer and used for reflecting the detection light. ⁇ Reflective layer;
  • the light guide performance of the light guide layer for the detection light is greater than the light guide performance of the light guide layer for the backlight of the liquid crystal display screen, and the reflection performance of the reflective layer for the detection light is greater than that of the detection light.
  • the reflective layer is provided with avoiding areas at the light receiving end and the light emitting end, so that part of the light guide layer is located on the surface of the light guide film ,
  • the light guide layer located on the surface of the light guide film respectively forms a light receiving unit and a light emitting unit near the detection light source and the fingerprint detection area.
  • the light-emitting surface of the detection light source is located on one side of the light guide film and is arranged opposite to the light receiving unit;
  • the light-emitting surface of the detection light source is wrapped in the light guide film and arranged opposite to the light receiving unit.
  • a receiving space for accommodating at least part of the detection light source is provided in the light guide layer or the reflective layer.
  • the light guide layer at the light emitting unit is provided with diffusion particles, and the diffusion particles are used to adjust the emission angle of the probe light so that the probe light Irradiate the fingerprint detection area;
  • an optical element is provided on the surface of the light guide layer at the light emitting unit, and the optical element is used to adjust the emission angle of the probe light so that the probe light irradiates the fingerprint detection area.
  • the light receiving unit and the light emitting unit are located on the same surface or on both sides of the light guide film.
  • the detection light source is a positive or side-emitting detection light source.
  • the liquid crystal display screen includes a liquid crystal panel and a protective cover, the liquid crystal panel is located between the protective cover and the backlight module, and the light guide film includes all The light receiving end, the light emitting end, and a light guide 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 and Located on the same side of the backlight module and the liquid crystal panel.
  • 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 and the first circuit board Bonding, or, the detection light source is bonded to the second circuit board.
  • the detection light source is attached to the outer surface of the first circuit board and is located under the backlight module, and the first circuit board is wrapped around the liquid crystal panel On the same side of the backlight module and electrically connected to the liquid crystal panel, the light receiving end is attached to the outer surface of the first circuit board.
  • 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 on the protective cover plate And the liquid crystal panel;
  • the light emitting end is located on the first circuit board near the bend of the protective cover, so that at least part of the detection light emitted by the light emitting end can illuminate the fingerprint detection area On the upper finger.
  • the light guide film and the first circuit board are simultaneously bent.
  • 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 protective cover. In this way, at least part of the detection light emitted by the light emitting end can illuminate the finger above the fingerprint detection area.
  • the light emitting end is attached to the inner wall of the frame of the middle frame.
  • the frame is provided with a supporting structure for supporting the protective cover, the light emitting end is located on one side of the supporting structure, or the light emitting end is attached It is fitted between the protective cover plate and the supporting surface of the supporting structure.
  • the light emitting end is directly attached to the surface of the inner wall of the frame, or the frame is provided at a position opposite to the light emitting end for accommodating the light.
  • the receiving space of the emitting end is such that at least part of the light emitting end is embedded in the frame.
  • the outer surface of the first circuit board is further provided with an isolation layer, and the light guide film or the light receiving end is attached to the first circuit through the isolation layer.
  • the isolation layer is provided with an escape space at a position relative 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 first circuit board ⁇ The outer surface.
  • the detection light source and the liquid crystal panel share a first circuit board to be connected to an external circuit, or the detection light source is connected to the first circuit through a third circuit board The board is electrically connected.
  • the detection 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 On the inner wall of the middle frame of the electronic device and extend along the inner wall of the middle frame toward the protective cover, so that at least part of the detection light emitted by the light emitting end can irradiate the On the finger above the fingerprint detection area.
  • the light emitting end is attached to the inner wall of the frame of the middle frame.
  • the frame is provided with a supporting structure for supporting the protective cover, the light emitting end is located on one side of the supporting structure, or the light emitting end is attached It is fitted between the protective cover plate and the supporting surface of the supporting structure.
  • the light emitting end is directly attached to the inner wall of the frame, or the frame is provided at a position opposite to the light emitting end for accommodating the light emitting end.
  • the light guide film body of the light guide film is attached to the middle frame, and the light receiving end passes through the support plate of the middle frame and is attached to the middle frame.
  • the frame is surrounded by an edge area of the supporting board.
  • the support plate is horizontally arranged between the liquid crystal display screen and the second circuit board, and the support plate is provided at a position opposite to the light guide film.
  • the third opening is used for allowing the light guide film to pass through the support plate to be attached to the second circuit board.
  • the light guide film has an at least partially bendable structure.
  • the present application provides a liquid crystal display fingerprint identification system, which is applied to electronic equipment, which includes a liquid crystal display screen, an under-screen fingerprint identification device and a light guide film as described in any one of the above, and the under-screen fingerprint
  • the identification device includes a detection light source for emitting detection light, which is guided by the light guide film to illuminate the finger above the fingerprint detection area to form fingerprint detection light carrying fingerprint information.
  • the present application provides an electronic device, which includes the above-mentioned liquid crystal display fingerprint identification system.
  • the present application provides a light guide film suitable for electronic equipment with a liquid crystal display screen and an under-screen fingerprint identification device.
  • the fingerprint detection area of the under-screen fingerprint identification device is at least partially located on the display of the liquid crystal display screen. Area; the under-screen fingerprint identification device includes a detection light source and a fingerprint identification module, the detection light source and the fingerprint identification module are located under the liquid crystal display screen;
  • the detection light source is used to emit detection light, and the detection light is guided by the light guide film to illuminate the finger above the fingerprint detection area to form a fingerprint detection light carrying fingerprint information; wherein the light of the light guide film
  • the receiving end 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 to receive the fingerprint that passes through the liquid crystal display screen The light is detected to obtain a fingerprint image of the finger.
  • the light guide film includes a light guide layer used to guide light to the detection light, and a reflective layer covering the surface of the light guide layer and used to reflect the detection light.
  • a light guide layer used to guide light to the detection light
  • a reflective layer covering the surface of the light guide layer and used to reflect the detection light.
  • the light guide performance of the light guide layer for the detection light is greater than the light guide performance of the light guide layer for the backlight of the liquid crystal display screen, and the reflection performance of the reflective layer for the detection light is greater than that of the detection light.
  • the reflective layer is provided with avoiding areas at the light receiving end and the light emitting end, so that part of the light guide layer is located on the surface of the light guide film ,
  • the light guide layer located on the surface of the light guide film respectively forms a light receiving unit and a light emitting unit near the detection light source and the fingerprint detection area.
  • the light-emitting surface of the detection light source is located on one side of the light guide film and is disposed opposite to the light receiving unit, or the light-emitting surface of the detection light source is wrapped in the The light guide film is arranged opposite to the light receiving unit.
  • a receiving space for accommodating at least part of the detection light source is provided in the light guide layer or the reflective layer.
  • the light guide layer of the light emitting unit is provided with diffusing particles, and the diffusing particles are used to adjust the emission angle of the probe light so that the probe light irradiates To the fingerprint detection area;
  • an optical element is provided on the surface of the light guide layer of the light emitting unit, and the optical element is used to adjust the emission angle of the probe light so that the probe light irradiates the fingerprint detection area .
  • the light receiving unit and the light emitting unit are located on the same surface or on both sides of the light guide film.
  • the detection light source is located under the liquid crystal display screen, and the light receiving end of the light guide film is set through the light guide film.
  • the light emitting end is set close to the fingerprint detection area, 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 is irradiated to the upper part of the fingerprint detection area through the light emitting end.
  • the finger forms the fingerprint detection light carrying fingerprint information;
  • the fingerprint recognition module is located under the liquid crystal display screen, and is used to receive the fingerprint detection light passing through the light-transmitting area to obtain the fingerprint image of the finger, so as to realize the electronic equipment using the LCD screen
  • the fingerprint recognition under the screen also helps to reduce the width of the chin area of the existing electronic products; this solves the problem that the infrared light source is set in the chin area of the electronic product through the flexible circuit board in the prior art electronic product, which results in the chin area of the mobile phone screen. Widened, and affect the overall screen-to-body ratio of the mobile phone.
  • Fig. 1 is a schematic structural diagram of a mobile phone equipped with an under-screen fingerprint recognition device in the prior art
  • FIG. 2 is a schematic structural diagram of the first mobile phone equipped with an under-screen fingerprint recognition device provided in Embodiment 1 of the application;
  • FIG. 3 is a schematic structural diagram of a second mobile phone equipped with an under-screen fingerprint recognition device provided in Embodiment 1 of this application;
  • FIG. 4 is a schematic diagram of the positional relationship between a light guide film and a first circuit board provided by Embodiment 1 of the present application;
  • FIG. 5 is a schematic diagram of the positional relationship between another light guide film and the first circuit board according to Embodiment 1 of the present application;
  • FIG. 6 is a schematic structural diagram of a light guide film provided by Embodiment 1 of the present application.
  • FIG. 7 is a schematic structural diagram of another light guide film provided in Embodiment 1 of the present application.
  • FIG. 8 is a schematic diagram of the structure of the light receiving end of the first light guide film provided in Embodiment 1 of the present application;
  • FIG. 9 is a schematic diagram of the light receiving end structure of the second light guide film provided in the first embodiment of the present application.
  • FIG. 10 is a schematic diagram of a light receiving end structure of a third light guide film provided in Embodiment 1 of the present application;
  • FIG. 11 is a schematic diagram of the structure of the light receiving end of the fourth light guide film provided in Embodiment 1 of the present application;
  • FIG. 12 is a schematic diagram of the structure of the light receiving end of the fifth light guide film provided in Embodiment 1 of the present application;
  • FIG. 13 is a schematic diagram of the structure of the light receiving end of the sixth light guide film provided in Embodiment 1 of the present application;
  • FIG. 14 is a schematic diagram of the structure of the light emitting end of the first light guide film provided in Embodiment 1 of the present application;
  • FIG. 16 is a schematic diagram of a light emitting end structure of a third light guide film provided in Embodiment 1 of the present application;
  • FIG. 17 is a schematic diagram of a light emitting end structure of a fourth light guide film provided in Embodiment 1 of the present application.
  • FIG. 18 is a schematic diagram of the structure of the light emitting end of the fifth light guide film provided in Embodiment 1 of the present application;
  • FIG. 19 is a schematic diagram of the structure of the light emitting end of the sixth light guide film provided in Embodiment 1 of the present application;
  • 20 is a schematic structural diagram of the first mobile phone equipped with an under-screen fingerprint recognition device provided in the second embodiment of the present application;
  • 21 is a schematic diagram of a partial structure of a second mobile phone equipped with an under-screen fingerprint recognition device provided in the second embodiment of the present application;
  • 22 is a schematic structural diagram of the first mobile phone equipped with an under-screen fingerprint recognition device provided in the third embodiment of the present application;
  • FIG. 23 is a partial structural diagram of a second mobile phone equipped with an under-screen fingerprint recognition device provided in Embodiment 3 of the present application.
  • the infrared light source is usually set on the chin area of an electronic product such as a mobile phone 100 through a flexible circuit board (that is, a third circuit board) to perform infrared supplemental light. So as to realize the fingerprint recognition function under the screen. Since the infrared light source is set in the chin area of the electronic product through the flexible circuit board, it will additionally occupy the width of the chin area of the mobile phone 100, causing the chin area of the mobile phone 100 to widen, thereby affecting the overall screen-to-body ratio of the mobile phone 100, making the screen of the mobile phone 100 The decrease in the proportion is more obvious.
  • 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 that the infrared light source is attached to the middle frame 30 of an electronic product such as a mobile phone 100 are all limit size requirements, the prior art It is difficult to be narrower, so the chin area of the electronic product will be wider, which will affect the screen-to-body ratio of the mobile phone 100.
  • the present application provides an under-screen fingerprint identification device 20, a liquid crystal display screen fingerprint identification system, an electronic device, and a light guide film 23, which help reduce the width of the chin area of the existing electronic product, thereby improving the screen of the electronic product. Accounted for.
  • the embodiment of the present application provides an under-screen fingerprint identification device 20, a liquid crystal display screen fingerprint identification system, and a light guide film 23 applied to electronic equipment.
  • the electronic equipment may include, but is not limited to, a mobile phone 100 and a tablet using a liquid crystal display screen 10.
  • Electronic products or components such as computers, televisions, laptops, digital photo frames, navigators, fingerprint locks, etc.
  • the electronic device includes a liquid crystal display screen 10, a middle frame 30, and an under-screen fingerprint identification device 20 or a liquid crystal display screen fingerprint identification system provided in the embodiment of the present application.
  • the present embodiment takes the application scenario of the mobile phone 100 using the liquid crystal display screen 10 as an example, and further elaborates the under-screen fingerprint identification device 20, the liquid crystal display screen fingerprint identification system and the light guide film 23 of the present application.
  • FIG. 2 is a schematic diagram of the structure of the first mobile phone equipped with an under-screen fingerprint recognition device provided in the first embodiment of the application
  • FIG. 3 is a structure of the second mobile phone equipped with an under-screen fingerprint recognition device provided in the first embodiment of the application Schematic diagram
  • FIG. 4 is a schematic diagram of the positional relationship between a light guide film and the first circuit board provided by Embodiment 1 of the present application
  • FIG. 5 is a positional relationship between another light guide film and the first circuit board provided by Embodiment 1 of the present application Schematic diagram of the relationship.
  • the present application provides an under-screen fingerprint identification device 20, which is applied to electronic equipment with a liquid crystal display screen 10.
  • the fingerprint detection area (not marked in the figure) of the under-screen fingerprint identification device 20 is at least Part of it is located in the display area of the liquid crystal display screen 10;
  • the under-screen fingerprint identification device 20 includes a detection light source 21 and a fingerprint identification module 22, and the detection light source 21 and the fingerprint identification module 22 are both located under the liquid crystal display screen 10;
  • the detection light source 21 is used to emit detection light, and the detection light is guided by the light guide film 23 to illuminate the finger above the fingerprint detection area to form fingerprint detection light carrying fingerprint information; wherein the light receiving end 233 of the light guide film 23 is connected to the detection
  • the light emitting surface of the light source 21 is arranged oppositely, and the light emitting end 234 of the light guide film 23 is arranged close to the fingerprint detection area;
  • the fingerprint identification module 22 is used to receive the fingerprint detection light transmitted through the liquid crystal display screen 10 to obtain the fingerprint image of the finger.
  • the screen-to-body ratio is the ratio of the screen area to the entire machine area, that is, the larger the screen, the larger the screen-to-body ratio, which is more beneficial to the user experience.
  • Full screen is a relatively broad definition of the mobile phone 100 industry for the design of the ultra-high screen-to-body ratio mobile phone 100.
  • the full-screen mobile phone 100 can enhance the appearance of the mobile phone 100 and make the mobile phone 100 look more technological.
  • the front area of the fuselage can accommodate a larger screen, which significantly improves the visual experience.
  • the display area (not identified in the figure) of the liquid crystal display screen 10 is an area on the liquid crystal display screen 10 or the mobile phone 100 for displaying images.
  • the fingerprint detection area of the under-screen fingerprint identification device 20 is at least partially located in the display area of the liquid crystal display screen 10.
  • the area of the display area on the liquid crystal display screen 10 can be increased to obtain better users.
  • the fingerprint detection area may specifically be an area for the user to press with a finger to implement a fingerprint input operation.
  • the detection light source 21 is arranged under the liquid crystal display screen 10.
  • the light guide film 23 is arranged so that the light receiving end 233 of the light guide film 23 is opposite to the light emitting surface of the detection light source 21
  • the light emitting end 234 is set close to the fingerprint detection area; the light guide film 23 is used to guide the detection light emitted by the detection light source 21 to the light emitting end 234, so that the detection light is irradiated to the fingerprint detection area through the light emitting end 234.
  • the finger forms a fingerprint detection light carrying fingerprint information
  • the fingerprint detection light transmitted through the liquid crystal display screen 10 is received by the fingerprint recognition module 22 to obtain the fingerprint image of the finger, so as to realize the fingerprint recognition under the screen, compared with the existing In the technology, placing the detection light source 21 in the chin area (as shown in FIG. 1) results in an increase in the width of the chin area of the mobile phone 100, which can help reduce the increased width of the chin area of the mobile phone 100, or not increase the mobile phone 100.
  • the width of the chin area that is, the under-screen fingerprint recognition can be achieved while maintaining the original width of the chin area unchanged), thereby increasing the screen-to-body ratio of electronic products such as mobile phones 100.
  • the detection light source 21 may be located below the non-display area (not identified in the figure) at the edge of the liquid crystal display screen 10 (for example, near the chin area of the mobile phone 100), and the fingerprint recognition module 22 may be provided Below the display area (not identified in the figure) of the liquid crystal display screen 10 (for example, below 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 that is not displayed or has no display function, such as a chin area.
  • the light guide film 23 since the light receiving end 233 of the light guide film 23 is disposed opposite to the light emitting surface of the detection light source 21, the light guide 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.
  • the protective cover 111 of the LCD screen 10 may have an edge extension 1111 relative to the backlight module 12 of the LCD screen 10, and the edge extension 1111 may correspond to the chin area of the mobile phone 100. It can be used as a wiring area of the liquid crystal panel 112.
  • the liquid crystal panel 112 and the protective cover 111 constitute the display module 11 of the liquid crystal display screen 10.
  • the liquid crystal panel 112 may be a touch liquid crystal panel 112 with a touch detection function
  • the protective cover 111 is arranged above the liquid crystal panel 112 , Used to protect the liquid crystal panel 112 and provide the user with a finger-operated human-computer interaction interface.
  • the detection light source 21 is located under the liquid crystal display screen 10, and the light receiving end 233 of the light guide film 23 is arranged opposite to the light emitting surface of the detection light source 21 through the arrangement of the light guide film 23, and the light emitting end 234 is close to the fingerprint
  • the detection area is set, and 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 is irradiated to the finger above the fingerprint detection area through the light emitting end 234 and forms a fingerprint detection carrying fingerprint information
  • the fingerprint recognition module 22 is located under the liquid crystal display screen 10, and is used to receive the fingerprint detection light passing through the light-transmitting area to obtain the fingerprint image of the finger, so as to realize the fingerprint recognition under the screen of the electronic device using the LCD screen, It is helpful to reduce the width of the chin area of the existing electronic products; this solves the problem that the infrared light source is set in the chin area of the electronic product through the flexible circuit board in the prior art electronic products,
  • the light guide film 23 is a film structure that has a light guide and reflection effect on the detection light to improve The light utilization rate of the light source 21 is detected, thereby increasing the light intensity of the detection light used for fingerprint recognition.
  • the liquid crystal display screen 10 generally includes a backlight module 12 under the display module 11, and the fingerprint recognition module 22 is located under the backlight module 12 to ensure detection of the detection light emitted by the light source 21 component and the fingerprint detection light formed by irradiating the finger. It can pass through the liquid crystal display screen 10, the backlight module 12 is formed with a light-transmitting area (not marked in the figure) for transmitting fingerprint detection light, and the light-transmitting area may refer to the relevant optical film layer of the backlight module 12
  • the transmission path of the detection light and the fingerprint detection light forms an area where the wavelength band of the fingerprint detection light is light-transmitting.
  • the fingerprint recognition module 22 is located under the light-transmitting area of the backlight module 12 so that the fingerprint detection light can pass through the backlight module 12 Transmitted to the fingerprint recognition module 22.
  • the light-transmitting area may be the area corresponding to the transmission path of the fingerprint detection light on the liquid crystal display 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 finger The formed fingerprint detection light can penetrate the light-transmitting area of the backlight module 12.
  • the relative positions of the detection light source 21, the light transmission area of the backlight module 12, the fingerprint recognition module 22, and the light guide film 23 can be adjusted as needed, but the adjusted detection
  • the relative positions between the light source 21, the light-transmitting area of the backlight module 12, the fingerprint identification module 22, and the light guide film 23 need to satisfy that the detection light emitted by the light emitting end 234 of the light guide film 23 can illuminate the fingerprint detection area
  • the fingerprint detection light formed by the upper finger and reflected or transmitted by the finger can pass through the light-transmitting area of the backlight module 12 and enter the fingerprint identification module 22.
  • the wavelength of the detection light or the fingerprint detection light is different from the backlight provided by the backlight module 12 for displaying the image.
  • the waveband of the detection light or fingerprint detection light is different from the backlight waveband. Therefore, the fingerprint identification module 22 of the embodiment of the present application can not only use the fingerprint detection light passing through the backlight module 12 to achieve under-screen optical fingerprint detection, but also reduce the display of the detection light emitted by the detection light source 21 on the liquid crystal display screen 10. The effect causes interference to avoid affecting the display effect of the image.
  • the detection light and/or fingerprint detection light is infrared light or other light signals with wavelengths outside the visible light band and capable of fingerprint recognition, and the backlight provided by the backlight module 12 is visible light, so that the user
  • the light guide film 23 is an infrared light guide film 23 or other wavelengths outside the visible light band and can realize fingerprint identification.
  • Optical signal has guiding and reflecting film material.
  • the detection light and/or fingerprint detection light may include, but is not limited to, infrared light. Therefore, in this embodiment, the detection light is preferably infrared light, such as infrared light with a wavelength of 940 nm.
  • the detection light source 21 may be an infrared light source, and the detection light emitted by it is infrared light. Therefore, the fingerprint detection light formed by the detection light irradiating the finger and reflecting, scattering or transmitting on the finger is also infrared light.
  • 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), etc., in this embodiment, for the detection
  • the type of light source 21 is not further limited.
  • the infrared light emitted by the detection light source 21 is used as the detection light. Since the penetrating ability of infrared light is stronger than that of visible light, the penetration of the liquid crystal display screen 10 and the backlight module 12 can be more effectively enhanced. The fingerprint detects the light signal, thereby improving the fingerprint recognition effect.
  • FIG. 6 is a schematic structural diagram of a light guide film provided in Embodiment 1 of the present application
  • FIG. 7 is a schematic structural diagram of another light guide film provided in Embodiment 1 of the present application
  • FIG. 8 is a schematic diagram of a light guide film provided in Embodiment 1 of the present application.
  • FIG. 9 is a schematic diagram of the light receiving end structure of the second light guide film provided in the first embodiment of the present application.
  • FIG. 10 is the third light guide provided in the first embodiment of the present application.
  • FIG. 11 is a schematic diagram of the light receiving end structure of the fourth light guide film provided in the first embodiment of the present application
  • FIG. 12 is the light receiving end of the fifth light guide film provided in the first embodiment of the present application
  • 13 is a schematic diagram of the light receiving end of the sixth light guide film provided in Example 1 of the present application
  • FIG. 14 is a schematic view of the light emitting end of the first light guide film provided in Example 1 of the present application
  • FIG. 15 is a schematic diagram of the light emitting end structure of the second light guide film provided in Embodiment 1 of the present application.
  • an embodiment of the present application provides a light guide film 23, which includes a light guide layer 231 for measuring light and guide light, and a light guide layer 231 coated on the surface of the light guide layer 231 A reflective layer 232 for reflecting the detection light; the light receiving end 233 of the light guide film 23 receives the detection light from the detection light source 21 and then passes through the light guide layer 231 to guide the detection light to a certain extent.
  • the detection light is reflected by the reflective layer 232, so that the detection light is transmitted to the light emitting end 234 in the light guide film 23, and then irradiated on the finger above the fingerprint detection area, and the fingerprint information is formed by the finger. Fingerprint detection light.
  • the light guiding performance of the light guiding layer 231 to the detection light is greater than the light guiding performance of the light guiding layer 231 to the backlight (such as visible light) of the liquid crystal display screen 10, and the reflection of the reflective layer 232 to the detection light is greater than that of the reflective layer 232 to the liquid crystal display.
  • the reflective performance of the backlight of the screen 10 is to enhance the guiding effect of the light guide film 23 on the detection light.
  • the reflective layer 232 can be coated on the surface of the light guide layer 231 to form the light guide film 23 by coating, or the reflective layer 232 can be coated on the light guide layer in a superimposed manner.
  • the surface of 231 forms the light guide film 23, that is, the surface of the reflective layer 232 provided with the light guide layer 231 is fixed on the surface of the light guide layer 231 by pressing or other means.
  • the method of forming the film 23 is not further limited.
  • the light guide layer 231 can be made of a material that has high light guide properties for detecting light.
  • the light guide layer 231 can be made of polycarbonate (PC for short) or polyethylene terephthalate.
  • Glycol ester abbreviated as PET, commonly known as polyester resin
  • the light guiding layer 231 includes, but is not limited to, a light guiding layer made of PC or PET. 23 layers of light film.
  • the reflective layer 232 can be made of a material with high reflection performance for the detection light, wherein the reflection layer 232 can be made of silver, aluminum or other materials with high reflection performance for the detection light, that is, in this embodiment, the reflection layer 232 includes But it is not limited to films made of silver or aluminum.
  • the reflective layer 232 is provided with a avoidance area 235 at the light receiving end 233 and the light emitting end 234, respectively, so that a part of the light guide layer 231 is located on the light guide film 23.
  • the light guide layer 231 located on the surface of the light guide film 23 respectively forms a light receiving unit 2331 and a light emitting unit 2341 near the detection light source 21 and the fingerprint detection area, wherein the light receiving unit and the light emitting surface of the detection light source 21 Relatively arranged, used 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 irradiated to the fingerprint recognition area on the liquid crystal display screen 10.
  • the upper finger forms a fingerprint detection light carrying fingerprint information through the fingers.
  • the avoiding area 235 of the reflective layer 232 at the light receiving end 233 and the light emitting end 234 may be a partial avoiding structure of the reflective layer 232 relative to the light guide layer 231 to make At least part of the light guide layer 231 at the light receiving end 233 and the light emitting end 234 is not wrapped by the reflective layer 232, and the light guide layer 231 not wrapped by the reflective layer 232 forms light at the light receiving end 233 and the light emitting end 234, respectively The receiving unit 2331 and the light emitting unit 2341.
  • the size and shape of the avoiding area 235 at the light receiving end 233 and the light emitting end 234 of the reflective layer 232 are not further limited.
  • the avoiding area 235 only needs to meet the requirements for detecting light. It is sufficient that it can basically enter or exit from the light guide film 23.
  • the light-emitting surface of the detection light source 21 is located on one side of the light guide film 23 and is disposed opposite to the light receiving unit 2331, that is, the light guide layer 231 of the light receiving end 233
  • the reflective layer 232 is not wrapped and is located on the surface of the light guide film 23 (the arrangement of the detection light source 21 shown in FIG. 8, FIG. 10, and FIG. 11);
  • the light-emitting surface of the detection light source 21 is wrapped in the light guide film 23 and is disposed opposite to the light receiving unit 2331, wherein the detection light source 21 can be completely wrapped in the light guide film 23, or partially wrapped in the light guide film 23 ( The arrangement of the detection light source 21 shown in Fig. 6, Fig. 7, Fig. 9, Fig. 12 and Fig. 13).
  • the detection light source 21 can be wrapped in the light guide film 23 by the reflective layer 232 or the light guide layer 231 of the light guide film 23.
  • the arrangement of the detection light source 21 is not further limited. It is only necessary that the light receiving end 233 of the light guide film 23 can receive the detection light emitted by the detection light source 21 and guide the detection light to the light emitting end 234.
  • the light guide layer 231 or the reflective layer 232 is provided with a receiving space 239 for accommodating at least part of the detection light source 21.
  • the accommodating space 239 may be a notch or recessed structure formed on the light guide layer 231 that can accommodate at least part of the detection light source 21, or the accommodating space 239 may be formed on the reflective layer 232 and exposed to the light guide layer 231. At least part of the notch or recessed structure of the detection light source 21 can be accommodated.
  • the light receiving unit 2331 and the light emitting unit 2341 may be located on the same side or two sides of the light guide film 23, so that the light guide film 23 is more diversified in the mobile phone 100.
  • the applicability of the light guide film 23 is wider, and the inner space of the mobile phone 100 is better utilized to guide the detection light to the fingerprint recognition area, thereby realizing fingerprint recognition under the screen.
  • the detection light source 21 may be positively emitting light (as shown in FIGS. 6, 7, and 10 to 10).
  • 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 guiding the detection light.
  • the light emitting mode of the detection light source 21 is not further limited.
  • FIG. 16 is a schematic diagram of the light emitting end structure of the third light guide film provided in Embodiment 1 of the present application
  • FIG. 17 is a schematic diagram of the light emitting end structure of the fourth light guide film provided in Embodiment 1 of the present application
  • FIG. 18 is the present invention
  • FIG. 19 is a schematic diagram of the light emitting end structure of the sixth light guide film provided in the first embodiment of the present application.
  • the light guide layer 231 at the light emitting unit 2341 is provided with diffusion particles 236,
  • the diffusion particles 236 are used to adjust the emission angle of the detection light so that the detection light irradiates the fingerprint detection area to enhance the intensity of the detection light used for fingerprint recognition, thereby improving the effect of fingerprint recognition.
  • the diffusion particles 236 may be filled in the light guide layer 231.
  • the diffusion particle 236 may be a particle that can adjust the emission angle of the detection light, such as silica or other particles that can adjust the emission angle of the detection light. That is, the diffusion particle 236 includes but not only Limited to silica.
  • an optical element 237 is provided on the surface of the light guide layer 231 at the light emitting unit 2341, and the optical element 237 is used to adjust the detection light
  • the emission angle is such that the detection light is irradiated to the fingerprint detection area to enhance the intensity of the detection light used for fingerprint recognition, thereby improving the effect of fingerprint recognition.
  • the optical element 237 may be a small convex mirror or other optical elements that can adjust the emission angle of the detection light, that is, the optical element 237 includes but is not limited to a convex mirror.
  • the optical element 237 may be attached to the surface of the light guide layer 231 through an optical glue that can transmit detection light.
  • the avoiding area 235 of the light emitting end 234 may just meet the setting of the optical element 237, or the avoiding area 235 of the light emitting end 234 may be larger than the optical element 237. In this embodiment, the light emitting end is no longer required.
  • the shape and size of the avoidance area 235 of 234 are further elaborated.
  • the diffusion particles 236 may be provided in the light guide layer 231 at the light emitting end 234, and an optical element 237 may be further provided on the surface of the light guide layer 231 to further enhance the detection for fingerprint recognition.
  • the intensity of light may be provided in the light guide layer 231 at the light emitting end 234, and an optical element 237 may be further provided on the surface of the light guide layer 231 to further enhance the detection for fingerprint recognition. The intensity of light.
  • the liquid crystal display 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 guide film 23 includes light.
  • the receiving end 233, the light emitting end 234, and the light guide film body 238 located between the light receiving end 233 and the light emitting end 234; the light guide film body 238 may be located at the edge area of the protective cover 111 (that is, the edge extension 1111) It is arranged side by side with the liquid crystal panel 112 and the backlight module 12 (that is, does not overlap each other) and is located on the same side of the backlight module 12 and the liquid crystal panel 112.
  • the light guide film 23 is an integrated structure prepared by the light receiving end 233, the light emitting end 234, and the light guide film body 238.
  • the circuit board of the liquid crystal panel 112 is defined as the first circuit board 1121
  • the circuit board of the electronic device is defined as the second circuit board 40, that is, the electronic device
  • PCBs printed circuit boards
  • the second circuit board 40 may be the main board or the sub-board of the mobile phone 100
  • the detection light source 21 and the first circuit The board 1121 is attached, or the detection light source 21 is attached to the second circuit board 40.
  • the detection light source 21 is attached to the outer surface of the first circuit board 1121 and is located under the backlight module 12.
  • the first circuit board 1121 covers the liquid crystal panel 112 and the backlight The same side of the module 12 is electrically connected to the liquid crystal panel 112. Since the light receiving end 233 of the light guide film 23 is arranged opposite to the light emitting surface of the detection light source 21, the light receiving end 233 of the light guide film 23 is attached to the outer surface of the first circuit board 1121 and is located under the backlight module 12. , Used to receive and guide the detection light emitted by the detection light source 21 into the light guide film 23, and guide the detection light to the light emitting end 234 through the light guide film 23 and irradiate the finger above the fingerprint recognition area for fingerprint recognition.
  • 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 protective cover 111. Between the liquid crystal panels 112, that is, the light emitting end 234 is located in the middle layer between the protective cover 111 and the liquid crystal panel 112, so as to shorten the linear distance between the light emitting end 234 and the fingerprint recognition area, thereby reducing the detection light transmission process In the attenuation, improve the effect of fingerprint recognition.
  • the light emitting end 234 is located on the first circuit board 1121 near the bend of the protective cover 111 to prevent the liquid crystal panel 112 from blocking the detection light, so that the light is emitted. At least part of the detection light emitted from the end 234 can irradiate the finger above the fingerprint detection area, thereby realizing the fingerprint identification area.
  • the light emitting unit 2341 of the light emitting end 234 must be provided on the side of the light emitting end 234 close to the fingerprint recognition area.
  • the light guide film 23 is bent synchronously with the first circuit board 1121.
  • the structure of the mobile phone 100 is more compact, the internal space of the mobile phone 100 is saved as much as possible, and the width of the chin area is reduced.
  • the first circuit board 1121 can support and fix the light guide film 23 to a certain extent.
  • the first circuit board 1121 is a flexible printed circuit (Flexible Printed Circuit for short: FPC).
  • the detection light source 21 and the liquid crystal panel 112 share a first circuit board 1121 to connect to an external circuit, or the detection light source 21 passes through the third circuit board 211 (in the figure (Not marked in the middle) is electrically connected to the first circuit board 1121, so as to realize power supply to the detection light source 21 and the liquid crystal panel 112.
  • the third circuit board 211 is a circuit board electrically connected to the detection light source 21, and it may be an FPC board, a PCB board, or at least part of a bendable circuit board.
  • the light guide film 23 has an at least partially bendable structure, that is, the light guide film 23 may have a partially bendable structure or a fully bendable structure.
  • the outer surface of the first circuit board 1121 is further provided with an isolation layer 1122, and the liquid crystal panel 112 is processed through the isolation layer 1122.
  • the isolation protection is to prevent other electronic devices from interfering with 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.
  • the light guide film 23 or the light receiving end 233 (referring to the light guide film 23 in this embodiment) is attached to the outer surface of the first circuit board 1121 through the isolation layer 1122, that is, the isolation layer 1122 Located between the light guide film 23 and the first circuit board 1121, the first circuit board 1121 supports and guides the light guide film 23 to a certain extent.
  • the isolation layer 1122 is provided with a avoidance space (not marked in the figure) at a position relative to the light guide film 23 or the light receiving end 233, so that the light guide film 23 or The light receiving end 233 is directly attached to the outer surface of the first circuit board 1121. While realizing fingerprint recognition under the screen, the light guide film 23 or the light receiving end 233 is buried in the isolation layer through the opening of the escape space on the isolation layer 1122 In 1122, compared with the prior art where the detection light source 21 is arranged in the chin area, the width of the chin area can be further reduced or not increased, thereby helping to increase the screen-to-body ratio of electronic devices such as mobile phones 100.
  • the escape space on the isolation layer 1122 may be a recessed structure or notch opened by the isolation layer 1122 at a position opposite to the light guide film 23 or the light receiving end 233, and the recessed structure or notch will The light guide film 23 or the light receiving end 233 is buried in the isolation layer 1122.
  • the manner in which the escape space on the isolation layer 1122 is formed is not further limited.
  • the isolation layer 1122 may be copper foil or other dielectric layers capable of isolation. That is, in this embodiment, the isolation layer 1122 includes but is not limited to copper foil.
  • the entire light guide film 23 is attached to the surface of the first circuit board 1121 in this embodiment.
  • the bonding manner of the light guide film 23 and the first circuit board 1121 includes but is not limited to bonding.
  • the lower surface of the protective cover 111 at a position opposite to the light emitting end 234 is coated with a transparent Infrared ink 1112.
  • the fingerprint identification module 22 can be attached to the support plate 32 of the middle frame 30 of the mobile phone 100 by bonding, screw locking or welding.
  • the fingerprint identification module 22 is located under the liquid crystal display screen 10.
  • the support plate 32 of the middle frame 30 is provided with a first opening 321 in the area opposite to the fingerprint identification module 22.
  • An opening 321 is used to transmit the fingerprint detection light passing through the backlight module 12 to the fingerprint identification module 22 through the middle frame 30, wherein the middle frame 30 further includes a frame 31 provided with an edge area of the support plate 32.
  • the fingerprint recognition module 22 may be integrally attached to the lower surface of the middle frame 30 and located under the peripheral area of the first opening 321.
  • the fingerprint recognition module 22 It can be partially accommodated in the first opening 321, so that the fingerprint identification module 22 is completely located under the liquid crystal display screen 10.
  • the arrangement of the fingerprint identification module 22 is not further limited, as long as It is sufficient that the fingerprint detection light can enter the fingerprint identification module 22 through the first opening 321.
  • the shape and size of the first opening 321 can satisfy that the fingerprint detection light can basically pass through, so as to avoid affecting the acquisition of the fingerprint image because the fingerprint detection light cannot normally pass through the middle frame 30.
  • the size of the opening 321 is based on the receiving light path of the fingerprint identification module 22.
  • the fingerprint identification module 22 can refer to the structure of the fingerprint identification module 22 in the prior art. In the prior art, the structure of the fingerprint identification module 22 will not be further described.
  • 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, and the fingerprint recognition module 22 is provided Below the steel plate 122, and the steel plate 122 is provided with a second opening 1221 in the area corresponding to the fingerprint identification module 22, the second opening 1221 is used to transmit the fingerprint detection light passing through the optical film 121 through the steel plate 122 To the fingerprint recognition module 22, the second opening 1221 corresponds to the light-transmitting area. Therefore, the shape and size of the second opening 1221 can satisfy the fingerprint detection light that can pass through, so as to prevent the fingerprint detection light from being unable to normally pass through the steel plate 122 and affect the acquisition of fingerprint images. In this embodiment, the size of the second opening 1221 is based on the receiving light path of the fingerprint identification module 22.
  • the detection light source is located under the liquid crystal display screen, and the detection light emitted by the detection light source is guided to the light emission end through the light guide film, so that the detection light irradiates the finger above the fingerprint detection area through the light emission end and forms a carrying Fingerprint detection light with fingerprint information;
  • the fingerprint recognition module is located under the LCD screen, and is used to receive the fingerprint detection light passing through the light-transmitting area to obtain the fingerprint image of the finger, so as to realize the fingerprint recognition under the screen and help Reduce the width of the chin area of the existing electronic equipment, thereby increasing the screen-to-body ratio of the electronic equipment.
  • FIG. 20 is a schematic structural diagram of the first mobile phone equipped with an under-screen fingerprint recognition device provided in the second embodiment of the present application
  • FIG. 21 is a part of the second mobile phone equipped with an under-screen fingerprint recognition device provided in the second embodiment of the present application Schematic.
  • the light receiving end 233 of the light guide film 23 is attached to the surface of the first circuit board 1121 and is located below the liquid crystal display screen 10.
  • the light receiving end 233 is arranged opposite to the light emitting surface of the detection light source 21.
  • the difference between this embodiment and the first embodiment is that the light emitting end 234 in this embodiment is attached to the inner wall of the middle frame 30 of the electronic device. And extend along the inner wall of the middle frame 30 toward the protective cover 111, so that at least part of the detection light emitted by the light emitting end 234 can illuminate the finger above the fingerprint detection area, so as to realize the fingerprint recognition under the screen.
  • the width of the chin area of the electronic device such as the mobile phone 100 can be reduced, which helps to increase the screen-to-body ratio of the electronic device.
  • the mobile phone 100 may include a liquid crystal display screen 10 and a back cover (not marked in the figure), and the middle frame 30 is installed on the liquid crystal display screen 10 and the back cover. In between, and the liquid crystal display screen 10 is located in the middle frame 30.
  • other components inside the mobile phone 100 such as the second circuit board 40 (ie PCB board) of the mobile phone 100 and the battery, can be installed on the middle frame 30.
  • the connection between the middle frame 30 and the liquid crystal display screen 10 and the back cover may be by snapping, bonding or connection by fasteners.
  • the middle frame 30 may include a supporting plate 32 and a supporting plate 32.
  • the frame 31 of the edge area, the frame 31 may extend vertically from the edge area of the support plate 32 to form a plurality of side walls, and the plurality of side walls cooperate with the support plate 32 to form a receiving space 239 for receiving and supporting the liquid crystal display screen 10.
  • the arrangement of the detection light source 21 and the light guide film 23 can refer to the description of the light guide film 23 and the detection light source 21 in Embodiment 1. In this embodiment, further details will not be given.
  • the light emitting end 234 is attached to the inner wall of the frame 31 of the middle frame 30, and the attachment method of the light emitting end 234 and the frame 31 includes but not only Limited to bonding.
  • a support structure 311 for supporting the protective cover 111 is generally provided on the frame 31, as a possible implementation manner.
  • the light emitting end 234 may be located on 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 to the protective cover 111 and the supporting surface 312 of the supporting structure 311 between.
  • the position of the light emitting end 234 is not further limited. In this embodiment, it only needs to satisfy that the detection light emitted by the light emitting end 234 can irradiate the finger above the fingerprint recognition area and be formed by the finger. It is sufficient to carry the fingerprint detection light with fingerprint recognition.
  • the light emitting end 234 is directly attached to the surface of the inner wall of the frame 31, or the frame 31 is provided with a receiving space for accommodating the light emitting end 234 at a position opposite to the light emitting end 234 (in (Not marked in the figure), so that at least part of the light emitting end 234 is embedded in the frame 31, further reducing the width of the chin area or the thickness of the entire electronic device.
  • the light guide film body 238 can be attached to the inner wall of the frame 31.
  • the accommodating space may be a recessed structure or notch opened on the frame 31 at a position opposite to the light emitting end 234 or the light guide film 23, and the light emitting end 234 or the light guide film 23 is buried in the recessed structure or notch.
  • the manner of forming the receiving space on the frame 31 is not further limited.
  • the isolation layer 1122 may be provided at a position opposite to the detection light source 21. There are through holes so that the packaging structure of the detection light source 21 is buried in the isolation layer 1122 and attached to the first circuit board 1121. At this time, in order not to affect the detection light emitted by the detection light source 21, the detection light source 21 may emit light in the form of side light.
  • the detection light source is located under the liquid crystal display screen, and the detection light emitted by the detection light source is guided to the light emission end through the light guide film, so that the detection light irradiates the finger above the fingerprint detection area through the light emission end and forms a carrying
  • the fingerprint detection light with fingerprint information can help reduce the width of the chin area of the existing electronic device while realizing fingerprint recognition under the screen, thereby increasing the screen-to-body ratio of the electronic device.
  • FIG. 22 is a schematic structural diagram of the first mobile phone equipped with an under-screen fingerprint recognition device provided in the third embodiment of the present application
  • FIG. 23 is a part of the second mobile phone equipped with an under-screen fingerprint recognition device provided in the third embodiment of the present application Schematic.
  • the difference from the first and second embodiments described above is that in this embodiment, with reference to FIGS. 22 and 23, in this embodiment, the detection light source 21 and The second circuit board 40 is attached, the light receiving end 233 of the light guide 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 is being attached.
  • the inner wall of the frame 30 extends toward the protective cover 111, so that at least part of the detection light emitted from the light emitting end 234 can irradiate the finger above the fingerprint detection area.
  • the way of attaching the light guide film 23 to the second circuit board 40 and/or the middle frame 30 includes, but is not limited to, bonding.
  • the detection light source 21 can be directly attached to the second circuit board 40, or the detection light source 21 can be electrically connected to the second circuit board 40 through the third circuit board 211 (not marked in the figure), so as to realize the detection of the light source. 21 power supply.
  • the way of detecting the bonding of the light source 21 and the second circuit board 40 includes but is not limited to welding or bonding.
  • the arrangement of the detection light source 21 and the light guide film 23 can refer to the description of the light guide film 23 and the detection light source 21 in Embodiment 1. In this embodiment, further details will not be given.
  • the light emitting end 234 is attached to the inner wall of the frame 31 of the middle frame 30.
  • the structure of the light emitting end 234 attached to the inner wall of the frame 31 can refer to the description of the attaching method of the light emitting end 234 in the second embodiment, and it will not be described in this embodiment. Go further.
  • the support plate 32 of the middle frame 30 is horizontally arranged between the liquid crystal display screen 10 and the second circuit board 40 to separate the liquid crystal display screen 10 and the second circuit board 40.
  • the support plate 32 is provided with a third opening 322 at a position opposite to the light guide film 23, and the third opening 322 is used to allow the light guide film 23 to pass through the support plate 32 to be attached to the second circuit board 40.
  • the structure and size of the third opening 322 will not be further described in this embodiment, as long as the light guide film 23 can pass through the support plate 32 and be attached to the second circuit board 40.
  • the detection light source is located under the liquid crystal display screen, and the detection light emitted by the detection light source is guided to the light emission end through the light guide film, so that the detection light irradiates the finger above the fingerprint detection area through the light emission end and forms a carrying
  • the fingerprint detection light with fingerprint information can help reduce the width of the chin area of the existing electronic device while realizing fingerprint recognition under the screen, thereby increasing the screen-to-body ratio of the electronic device.
  • an embodiment of the present application provides a liquid crystal display fingerprint identification system, which is applied to an electronic device, which includes a liquid crystal display screen 10 and the under-screen described in any of the above embodiments. Fingerprint recognition device 20 and light guide film 23.
  • the under-screen fingerprint recognition device 20 includes a detection light source 21 and a fingerprint recognition module 22.
  • the detection light source 21 is located under the liquid crystal display screen 10, and the detection light source 21 is used to emit detection light, and the detection light passes through the light guide.
  • the guide of the film 23 illuminates the finger above the fingerprint detection area to form a fingerprint detection light carrying fingerprint information.
  • the detection light emitted by the detection light source 21 is guided to the light emission end 234 through the light guide film 23, so that the detection light is irradiated to the finger above the fingerprint detection area through the light emission end 234 and forms a fingerprint detection light carrying fingerprint information.
  • connection should be understood in a broad sense.
  • it can be a fixed connection or an intermediate connection.
  • the medium is indirectly connected, which can be the internal communication between two elements or the interaction between two elements.

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Abstract

La présente invention concerne un appareil de reconnaissance d'empreintes digitales dans l'affichage, un système de reconnaissance d'empreintes digitales LCD, un dispositif électronique et un film de guidage de lumière. L'appareil de reconnaissance d'empreintes digitales dans l'affichage est appliqué à un dispositif électronique pourvu d'un écran d'affichage à cristaux liquides, et une zone de détection d'empreinte digitale de l'appareil de reconnaissance d'empreinte digitale dans l'affichage est au moins partiellement située dans une zone d'affichage de l'écran d'affichage à cristaux liquides. L'appareil de reconnaissance d'empreinte digitale dans l'affichage comprend une source de lumière de détection, un module de reconnaissance d'empreintes digitales et un film de guidage de lumière, la source de lumière de détection et le module de reconnaissance d'empreintes digitales étant tous deux situés sous l'écran d'affichage à cristaux liquides. Dans la présente invention, le film de guidage de lumière est utilisé pour guider la lumière de détection émise par la source de lumière de détection vers une extrémité d'émission de lumière de telle sorte que la lumière de détection est, au moyen de l'extrémité d'émission de lumière, irradiée vers un doigt au-dessus de la zone de détection d'empreinte digitale et forme une lumière de détection d'empreinte digitale qui porte des informations d'empreinte digitale, et le module de reconnaissance d'empreinte digitale est utilisé pour recevoir la lumière de détection d'empreinte digitale qui pénètre à travers une zone de transmission de lumière afin d'acquérir une image d'empreinte digitale du doigt, ce qui permet de réduire la largeur d'une zone de menton de produits électroniques existants tout en obtenant une reconnaissance d'empreinte digitale dans l'affichage.
PCT/CN2019/119324 2019-11-19 2019-11-19 Appareil de reconnaissance d'empreintes digitales dans l'affichage, système de reconnaissance d'empreintes digitales lcd, dispositif électronique et film de guidage de lumière WO2021097639A1 (fr)

Priority Applications (2)

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PCT/CN2019/119324 WO2021097639A1 (fr) 2019-11-19 2019-11-19 Appareil de reconnaissance d'empreintes digitales dans l'affichage, système de reconnaissance d'empreintes digitales lcd, dispositif électronique et film de guidage de lumière
CN201980004177.XA CN111095276B (zh) 2019-11-19 2019-11-19 屏下指纹识别装置、lcd指纹识别系统、电子设备及导光膜

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PCT/CN2019/119324 WO2021097639A1 (fr) 2019-11-19 2019-11-19 Appareil de reconnaissance d'empreintes digitales dans l'affichage, système de reconnaissance d'empreintes digitales lcd, dispositif électronique et film de guidage de lumière

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CN114244940A (zh) * 2022-01-11 2022-03-25 Oppo广东移动通信有限公司 屏下识别组件以及电子设备

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CN115050061B (zh) * 2021-12-29 2023-05-09 荣耀终端有限公司 电子设备

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