WO2020181495A1 - 一种背后光学指纹识别系统及电子装置 - Google Patents

一种背后光学指纹识别系统及电子装置 Download PDF

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Publication number
WO2020181495A1
WO2020181495A1 PCT/CN2019/077862 CN2019077862W WO2020181495A1 WO 2020181495 A1 WO2020181495 A1 WO 2020181495A1 CN 2019077862 W CN2019077862 W CN 2019077862W WO 2020181495 A1 WO2020181495 A1 WO 2020181495A1
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WIPO (PCT)
Prior art keywords
fingerprint
optical
optical fingerprint
back cover
module
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Application number
PCT/CN2019/077862
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English (en)
French (fr)
Inventor
谢浩
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 CN201980000448.4A priority Critical patent/CN110062932B/zh
Priority to PCT/CN2019/077862 priority patent/WO2020181495A1/zh
Publication of WO2020181495A1 publication Critical patent/WO2020181495A1/zh

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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

Definitions

  • This application relates to the field of fingerprint identification technology, and in particular to a back-side optical fingerprint identification system and electronic device.
  • Fingerprint recognition technology refers to the identification of fingerprint information through the fingerprint recognition module sensing and analyzing the signals of the valley and ridge of the fingerprint. It has the advantages of high security and convenient operation, and is widely used in electronic products.
  • the implementation of fingerprint imaging technology includes optical imaging, capacitive imaging, ultrasonic imaging and other technologies. Among them, optical fingerprint recognition technology has gradually become a fingerprint due to its strong penetrating ability, support for full-screen placement, and simple product structure design. The mainstream of recognition technology is widely used in electronic devices.
  • the optical fingerprint recognition module when the optical fingerprint recognition module is set in the display screen, the optical recognition module is located under the display screen.
  • the display module includes a liquid crystal display panel and a backlight module. The group is located between the backlight module and the liquid crystal display panel, and the optical sensing area of the optical fingerprint recognition module faces the liquid crystal display panel.
  • the optical fingerprint recognition module is set in the non-display area of the liquid crystal display panel, that is, the optical fingerprint recognition module Located at the edge of the screen, the fingerprint detection area can be located under the display area of the screen.
  • the light is refracted by the finger in the fingerprint detection area and then returns to the refracted light with fingerprint information.
  • the refracted light irradiates the optical fingerprint recognition module and is reflected by the optical fingerprint recognition module. Receive and form a fingerprint image, and compare the fingerprint image with the stored fingerprint image to complete fingerprint identification.
  • the fingerprint recognition method behind it has gradually been favored by users. Since the LCD screen is passively illuminated, its backlight module includes steel plates and Reflective film, etc. are opaque, and the diffuser film and the light-enhancing film in the backlight module also have fogging effect and direction restraint on the light respectively, which causes the optical fingerprint recognition module to be unable to detect fingerprints in the back mode of the LCD screen .
  • the present invention provides a backside optical fingerprint identification system and an electronic device, so as to solve the problem that the existing optical fingerprint recognition module cannot realize fingerprint detection in the backside mode of the electronic device.
  • the first aspect of the present invention provides a back optical fingerprint recognition system, which is applied to an electronic device with a display module and a back cover, characterized in that the back optical fingerprint recognition system includes: a fingerprint detection light source and an optical fingerprint recognition module group;
  • the fingerprint detection light source and the optical fingerprint recognition module are located between the display module and the back cover, and the fingerprint detection light source is used to emit detection to the fingerprint detection area on the back cover
  • the detection light forms return light when irradiating the finger in the fingerprint detection area
  • the optical fingerprint recognition module is used to receive the return light and form a fingerprint image.
  • the optical fingerprint recognition module includes an optical element and a fingerprint image sensor, the optical element is located on the side of the fingerprint image sensor close to the back cover, and the optical element is arranged At a position corresponding to the fingerprint image sensor, the return light passes through the optical element and enters the fingerprint image sensor to form a fingerprint image.
  • the optical element is a lens, and the convex end of the lens faces the fingerprint image sensor.
  • the optical element is a collimating hole layer, and a plurality of light-transmitting holes parallel to each other are opened in the collimating hole layer, so that the returning light is projected after passing through the light-transmitting holes.
  • the fingerprint image sensor On the fingerprint image sensor.
  • the optical element includes: a microlens layer and an aperture layer, a transparent material layer is arranged between the microlens layer and the aperture layer, and the microlens layer is close to the The back cover is provided, and the convex end of the microlens layer faces the back cover;
  • the diaphragm layer includes a diaphragm plate, and a plurality of diaphragm holes parallel to each other are opened on the diaphragm plate, so that the returning light passes through the microlens layer and the transparent material layer in sequence.
  • the diaphragm hole irradiates the fingerprint image sensor.
  • the diaphragm layer includes a diaphragm plate laminated in multiple layers.
  • the fingerprint detection light source includes a visible light fingerprint detection light source or a non-visible light fingerprint detection light source.
  • the fingerprint detection light source is an infrared fingerprint detection light source.
  • it further includes a filter layer, the filter layer being located between the optical fingerprint recognition module and the back cover and corresponding to the optical fingerprint recognition module; or, The filter layer is located between the optical element of the optical fingerprint identification module and the fingerprint image sensor and corresponds to the fingerprint image sensor.
  • it further includes a light-transmissive bonding layer, and the bonding layer is used to bond the filter layer to the optical element.
  • the present invention further includes an identification display module, the identification display module is located between the back cover and the optical fingerprint recognition module, the identification display module includes a visible light source and a homogenizing plate, so The visible light sources are arranged in parallel on one side of the light homogenizing plate.
  • the sign display module further includes: a reflective film, the reflective film is arranged above the side of the light homogenizing plate and the visible light source facing the back cover, and the reflective film is used for It is used to transmit the detection light emitted by the fingerprint detection light source and to reflect the visible light emitted by the visible light source.
  • a touch detection module is further included, and the touch detection module is located between the back cover and the optical fingerprint recognition module.
  • a through hole is provided at a position corresponding to the fingerprint detection area on the back cover, so that the detection light can pass through the back cover and illuminate the fingerprint detection area. on.
  • the back cover is formed of a material that can transmit the probe light.
  • a blind hole is provided at a position corresponding to the fingerprint detection area on the back cover.
  • the fingerprint detection light source is annular, and the fingerprint detection light source is arranged around the optical fingerprint identification module.
  • the present invention further includes a substrate, the substrate is located between the back cover and the display module, and the fingerprint detection light source and the optical fingerprint recognition module are arranged on the substrate Facing the side of the back cover.
  • the material of the back cover includes any one or a combination of plastic, glass, aluminum alloy, or ceramic.
  • a second aspect of the present invention provides an electronic device, which is characterized by comprising any of the above-mentioned back optical fingerprint recognition systems.
  • the present invention provides a back optical fingerprint recognition system and electronic device.
  • the back optical fingerprint recognition system includes a fingerprint detection light source and an optical fingerprint recognition module, and the fingerprint detection light source and the optical fingerprint recognition module are located at the back of the display module Between the cover plates, the fingerprint detection light source is used to emit detection light to the fingerprint detection area on the back cover plate, even if the electronic device includes a opaque film such as a backlight module, the detection light is emitted from the fingerprint detection light source During the fingerprint detection area, it will not be affected by the backlight module, etc. When the detection light irradiates the finger on the fingerprint detection area, it is reflected to form the return light. The return light carries the fingerprint information, and the return light is transmitting The process will not be affected by the backlight module, etc.
  • the return light passes through the back cover and irradiates the optical fingerprint recognition module.
  • the optical fingerprint recognition module is used to receive the return light to form a fingerprint based on the return light.
  • Image the fingerprint image is converted into an electrical signal and then the fingerprint can be compared and recognized, thereby realizing the detection of optical fingerprint, that is, realizing the optical fingerprint recognition detection in the back mode of the electronic device, and solving the existing optical fingerprint recognition model
  • the problem is that fingerprint detection cannot be realized in the back mode of the electronic device.
  • FIG. 1 is a schematic structural diagram of a backside optical fingerprint recognition system provided by Embodiment 1 of the present invention
  • FIG. 2 is a schematic structural diagram of yet another backside optical fingerprint recognition system provided by Embodiment 1 of the present invention.
  • Embodiment 3 is a schematic structural diagram of yet another backside optical fingerprint recognition system provided by Embodiment 1 of the present invention.
  • FIG. 4 is a schematic structural diagram of yet another backside optical fingerprint identification system provided by Embodiment 1 of the present invention.
  • FIG. 5 is a fingerprint recognition flow chart of a backside optical fingerprint recognition system according to Embodiment 1 of the present invention.
  • Fig. 6 is an electronic device with a backside optical fingerprint recognition system provided by the first embodiment of the present invention.
  • FIG. 7 is another electronic device with a backside optical fingerprint recognition system provided by Embodiment 1 of the present invention.
  • FIG. 8 is another electronic device with a backside optical fingerprint recognition system provided by Embodiment 1 of the present invention.
  • FIG. 9 is another electronic device with a backside optical fingerprint recognition system provided by Embodiment 1 of the present invention.
  • FIG. 10 is a schematic structural diagram of a backside optical fingerprint identification system provided by the second embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of a backside optical fingerprint recognition system provided by Embodiment 3 of the present invention.
  • FIG. 12 is a schematic structural diagram of a backside optical fingerprint recognition system provided by Embodiment 4 of the present invention.
  • FIG. 13 is a schematic structural diagram of a collimating hole layer in a back optical fingerprint identification system provided by Embodiment 4 of the present invention.
  • FIG. 14 is a schematic structural diagram of yet another backside optical fingerprint recognition system provided by the fourth embodiment of the present invention.
  • Embodiment 15 is a schematic structural diagram of a backside optical fingerprint recognition system provided by Embodiment 5 of the present invention.
  • FIG. 16 is a schematic diagram of the structure of a microlens layer in a back optical fingerprint recognition system provided by Embodiment 5 of the present invention.
  • FIG. 17 is a partial enlarged schematic diagram of a backside optical fingerprint recognition system provided by Embodiment 5 of the present invention.
  • FIG. 18 is a partial enlarged schematic diagram of another rear optical fingerprint recognition system provided by the fifth embodiment of the present invention.
  • FIG. 19 is a partial enlarged schematic diagram of another rear optical fingerprint recognition system provided by the fifth embodiment of the present invention.
  • FIG. 20 is a schematic structural diagram of yet another backside optical fingerprint recognition system provided by Embodiment 5 of the present invention.
  • Back cover-10 through hole-11; blind hole-12; back optical fingerprint recognition system-20; fingerprint detection light source-21; optical fingerprint recognition module-22; optical element-221; fingerprint image sensor-222; transparent Light hole-223; Micro lens layer-224; Diaphragm layer-225; Diaphragm hole-226; Laminating layer-227; Filter layer-23; Logo display module-24; Visible light source-241; Homogenizing plate-242 ;Reflective film-243; Touch detection module-25; Substrate-26; Electronic equipment-30.
  • FIG. 1 is a schematic structural diagram of a backside optical fingerprint recognition system provided by embodiment 1 of the present invention
  • Fig. 2 is a schematic diagram of a backside optical fingerprint recognition system provided by embodiment 1 of the present invention
  • Fig. 3 is an embodiment of the present invention
  • One provides a schematic structural diagram of yet another back optical fingerprint recognition system.
  • FIG. 4 is a schematic diagram of another back optical fingerprint recognition system provided in Embodiment 1 of the present invention.
  • FIG. 5 is a schematic diagram of another back optical fingerprint recognition system provided in Embodiment 1 of the present invention.
  • FIG. 6 is an electronic device with a back optical fingerprint identification system provided in the first embodiment of the present invention
  • Figure 7 is another embodiment with a back optical fingerprint identification system provided in the first embodiment of the present invention
  • FIG. 8 is another electronic device with a backside optical fingerprint recognition system provided by the first embodiment of the present invention
  • FIG. 9 is another electronic device with a backside optical fingerprint recognition system provided by the first embodiment of the present invention.
  • This embodiment provides a back optical fingerprint recognition system, which is applied to an electronic device with a display module and a back cover.
  • Electronic devices such as mobile phones and tablet computers usually include a housing and a display screen.
  • the housing includes a back cover and The notched front shell, the display screen is set in the notch, the back cover and the front shell form a cavity for placing the display module to realize the display of the display screen.
  • the display module can be an OLED screen display module or It can be an LCD screen display module, where the LCD screen is passively illuminated.
  • the display module includes a liquid crystal display panel and a backlight module.
  • the backlight module is located behind the display panel and can provide a light source. Its function is to supply sufficient brightness and distribution Uniform light source, so that the display module can display images normally.
  • the optical fingerprint recognition module When the optical fingerprint recognition module is installed in the LCD or OLED display screen, it is usually installed between the display panel and the display module. Specifically, when installed in the LCD screen, the optical fingerprint recognition module is installed in the display panel and the backlight module. In order to prevent the optical fingerprint recognition module from affecting the display effect of the display panel, the optical fingerprint recognition module is set at a position opposite to the non-display area of the display panel, that is, the optical fingerprint recognition module is set at the edge of the screen.
  • the fingerprint detection area can be located below the display area of the screen or set at the edge of the screen, so that the setting of the optical fingerprint recognition module will affect the screen ratio of the display screen, and as the user is concerned with large screens and full-screen electronic devices In order to increase the screen ratio, the fingerprint recognition method behind the fingerprint detection area is increasingly favored by users.
  • the existing back fingerprint recognition is mostly capacitive fingerprint recognition, which is due to the backlight module as the light source .
  • the steel plate and reflective film included are opaque, and the diffuser film and the brightness enhancement film included in the backlight module also have the effect of fogging and directional restraint on the light, which results in the location between the backlight module and the display panel
  • the detection light source cannot pass through the backlight module and illuminate the light fingerprint identification module behind the backlight module, resulting in the optical fingerprint identification module being unable to realize fingerprint identification and detection.
  • the optical fingerprint recognition system includes a fingerprint detection light source 21 and an optical fingerprint recognition module 22.
  • the fingerprint detection light source 21 is used to emit detection light to illuminate the finger in the fingerprint detection area.
  • the optical fingerprint recognition module 22 It is used to receive the return light with fingerprint information and form a fingerprint image with the return light, and convert the fingerprint image into an electrical signal to compare and recognize the fingerprint.
  • the fingerprint detection light source 21 and The optical fingerprint recognition module 22 is located between the display module and the back cover 10.
  • the fingerprint detection light source 21 and the optical fingerprint recognition module 22 are both located on the backlight module and the back cover. 10
  • the fingerprint detection light source 21 emits detection light to the fingerprint detection area on the back cover 10, even if the electronic device has an opaque film such as a backlight module, the detection light is emitted from the fingerprint detection light source 21 During the fingerprint detection area, it will not be affected by the backlight module, etc., when the detection light irradiates the finger on the fingerprint detection area, it is reflected to form the return light, the return light carries the fingerprint information, and the return light is in the transmission process It will not be affected by the backlight module, etc.
  • the return light passes through the back cover 10 and then illuminates the optical fingerprint recognition module 22.
  • the optical fingerprint recognition module 22 receives the return light and can form a fingerprint based on the return light. Image, the fingerprint image is converted into an electrical signal for transmission to perform fingerprint comparison and recognition, thereby realizing optical fingerprint detection.
  • the sensing area of the optical fingerprint recognition module 22 faces the side of the back cover 10, that is, the return light formed by the reflection of the finger directly illuminates the optical fingerprint after passing through the back cover 10
  • the sensing area of the identification module 22 is so that the optical fingerprint identification module 22 receives the returned light and forms a fingerprint image based on the returned light.
  • the finger when fingerprint identification and detection are required, the finger is placed on the fingerprint detection area of the back cover 10 of the electronic device 30, and the fingerprint detection light source 21 emits detection light to the fingerprint detection area, and the detection light is irradiated to the fingerprint
  • the finger on the detection area is on the finger, it is reflected by the finger to form a return light with finger information.
  • the return light passes through the back cover 10 and then illuminates the optical fingerprint identification module 22, and the optical fingerprint identification module 22 receives the return light.
  • a fingerprint image is formed according to the information contained in the returned light, and after the fingerprint image is converted into an electrical signal, the fingerprint information can be compared and detected, thereby realizing the optical fingerprint recognition behind it.
  • the thickness of the back cover 10 there is no other requirement on the thickness of the back cover 10, and it is enough to transmit the detection light and the return light. Compared with capacitive fingerprint recognition, the thickness of the applicable cover plate of capacitive fingerprint is limited. Since the fingerprint information of the optical fingerprint identification module is transmitted through the optical path, it requires less thickness of the back cover 10 and can support a thicker back cover 10 thickness.
  • the fingerprint detection light source 21 and the optical fingerprint recognition module 22 can be arranged in parallel between the backlight module and the back cover 10, and the two can also be located in the backlight by other arrangements. Between the module and the back cover 10, it can be ensured that the detection light of the fingerprint detection light source 21 can illuminate the fingerprint detection area on the back cover 10, and the optical fingerprint recognition module 22 can receive the return light formed by the reflection of the finger. can. There are no other requirements on the specific positions of the fingerprint detection light source 21 and the optical fingerprint identification module 22 between the backlight module and the back cover 10, and similarly, it is only necessary to realize their respective functions.
  • the fingerprint detection area can be a part or multiple parts of the area delineated on the back cover 10, or it can be an area covering the entire back cover 10.
  • the fingerprint detection area can be located in the upper part of the back cover 10 in the vertical direction (such as in the vertical direction). Three-quarters or two-thirds of the straight back cover 10, etc.) to facilitate fingerprint detection and recognition when the user takes the device, and improve the user experience.
  • the optical fingerprint recognition module 22 may be an optical fingerprint recognition module in the prior art. Specifically, it may include an optical modulation device and an optical image sensor device, etc., and may also include other devices. Specific settings The manner can refer to the prior art, which will not be repeated in this embodiment.
  • the back optical fingerprint recognition system 20 includes a fingerprint detection light source 21 and an optical fingerprint recognition module 22, and the fingerprint detection light source 21 and the optical fingerprint recognition module 22 are located on the display module and the back cover 10 In between, the fingerprint detection light source 21 is used to emit detection light to the fingerprint detection area on the back cover 10, even if the electronic device includes a opaque mold layer such as a backlight module, the detection light starts from the fingerprint detection light source 21 The process of irradiating the fingerprint detection area will not be affected by the backlight module, etc., when the detection light irradiates the finger on the fingerprint detection area, it is reflected to form the return light, which carries the fingerprint information, and the return light is transmitting During the process, it will not be affected by the backlight module, etc.
  • the return light passes through the back cover 10 and then irradiates the optical fingerprint recognition module 22.
  • the optical fingerprint recognition module 22 is used to receive the return light to be able to respond according to the return light.
  • the fingerprint image is formed by light, and the fingerprint image is converted into an electrical signal to be transmitted for comparison and recognition of fingerprints, thereby realizing the detection of optical fingerprints, that is, realizing the optical fingerprint recognition detection in the back mode of the electronic device, and solving the existing optical
  • the fingerprint recognition module cannot achieve fingerprint detection in the back mode of the electronic device.
  • the fingerprint detection light source 21 includes a visible light fingerprint detection light source or a non-visible fingerprint detection light source, where the visible fingerprint detection light source refers to a fingerprint detection light source that can emit visible light, and the non-visible fingerprint detection light source refers to a fingerprint detection light source that can emit visible light.
  • visible light fingerprint detection light source that is, the detection light emitted by the fingerprint detection light source is visible light or the detection light emitted by the fingerprint detection light source is invisible light.
  • the fingerprint detection light source 21 a non-visible light fingerprint detection light source, and the emitted detection light is non-visible light, so when fingerprint detection is performed, when the light emitted by the fingerprint detection light source 21 illuminates the fingerprint detection area, the detection light is invisible to the user Yes, compared with using visible light as the detection light, during fingerprint detection, the detection area will not produce visible brightness, which can avoid brightness during each detection and reduce user experience.
  • the fingerprint detection light source 21 may be a light emitting diode (LED), a vertical cavity surface emitting laser (VCSEL), a laser diode (Laser Diode), etc., which is not limited in this embodiment.
  • LED light emitting diode
  • VCSEL vertical cavity surface emitting laser
  • Laser Diode laser diode
  • the fingerprint detection light source 21 is an infrared fingerprint detection light source, that is, the detection light emitted by the fingerprint detection light source 21 is infrared light.
  • the infrared light has good penetrability and can penetrate such as ceramics, plastics and certain Some metals can facilitate the infrared detection light to pass through the back shell and then irradiate on the optical fingerprint recognition module 22. There is no need to open a dedicated light path on the back shell, which helps to improve the aesthetics of the back shell and also helps to widen it. The material range of the back shell.
  • the back optical fingerprint recognition system 20 further includes a filter layer, which is located between the optical fingerprint recognition module 22 and the back cover 10 and corresponds to the optical fingerprint recognition module 22.
  • a filter layer which is located between the optical fingerprint recognition module 22 and the back cover 10 and corresponds to the optical fingerprint recognition module 22.
  • the filter layer is used to make the detection light and the detection light irradiate the finger
  • the return light formed at the time passes through and filters out the visible light entering the fingerprint recognition module.
  • the filter layer has good transmittance to the return light , And can filter out the visible light in the environment, so that while ensuring the realization of optical fingerprint recognition, it can prevent the visible light in the environment from entering the optical fingerprint recognition module 22, affecting the recognition of the optical fingerprint recognition module 22, and effectively avoiding The interference of visible light in the environment on fingerprint detection improves the accuracy of fingerprint detection.
  • the light wavelength of the detection light should be different from the light wavelength of the visible light that is mainly filtered out to ensure that the optical fingerprint recognition can be realized.
  • the filter layer may include a filter, and the type of the filter may be selected according to the specific type of the fingerprint detection light source 21.
  • the fingerprint detection light source 21 is an infrared fingerprint detection light source 21, which emits detection light
  • the type of filter is a filter that can transmit infrared light and filter out visible light.
  • the back optical fingerprint identification system 20 further includes an identification display module 24.
  • the identification display module 24 is located between the back cover 10 and the optical fingerprint identification module 22, specifically ,
  • the identification display module 24 can correspond to the location of the fingerprint detection area, the identification display module 24 can be used to display images, numbers, text, and a variety of combined identifications, etc., which can be used to increase the beauty of the electronic device, and at the same time identify the display module
  • the setting is convenient for users to identify the specific location of the fingerprint detection area and is easy to use.
  • the identification may be a production identification of the electronic device, or a model identification of the electronic device, or other types of identifications.
  • the sign display module 24 includes a visible light source 241 and a light homogenizing plate 242.
  • the visible light source 241 is arranged in parallel on one side of the light homogenizing plate 242, and the visible light is used for marking
  • the display provides a light source. It should be noted that when the back optical identification system is provided with the logo display module 24, the position of the back cover 10 corresponding to the logo display module 24 should be made of a material that can transmit visible light to ensure the logo display module display.
  • the visible light source 241 may be a breathing light or the like, so that the logo can be displayed in a standby state, which further improves the aesthetics of the electronic device and at the same time improves the user experience.
  • the sign display module 24 further includes a reflective film 243, which is disposed above the side of the light homogenizing plate 242 and the visible light source 241 facing the back cover 10, and the reflective film 243 It is used to transmit the detection light emitted by the fingerprint detection light source 21 and to reflect the visible light emitted by the visible light source 241, that is, the reflective film 243 has a good transmittance to the detection light and the return light, and has a high degree of visible light. Reflectivity, so that the return light can pass through the reflective film 243 and enter the optical fingerprint recognition module 22 to ensure that the optical fingerprint detection is not affected.
  • the reflective film 243 has a high reflectivity to visible light, which can ensure the identification display mode.
  • the light emitted by the group of visible light sources 241 can be fully emitted from the back cover 10 to ensure the display brightness of the logo.
  • the specific type of the reflective film 243 can be selected according to the type of detection light. If the detection light is infrared light, the reflective film 243 can be reflective with high infrared transmittance and high reflectivity for visible light.
  • the reflective film 243 may be a reflective film in the prior art, and the specific material of its molding can be referred to the prior art, which will not be repeated in this embodiment.
  • the optical fingerprint recognition system further includes a touch detection module 25, which is used to recognize the touch of a finger to initiate fingerprint detection and recognition.
  • the touch detection module 25 is located between the back cover 10 and the optical fingerprint recognition module 22.
  • the touch detection module 25 may be located between the identification display module 24 and
  • the optical fingerprint identification module 22 can also be located between the identification display module 24 and the back cover 10, wherein the touch detection module 25 can correspond to the fingerprint detection area, and the touch detection module 25 can recognize that the finger has effectively touched the fingerprint In the detection area, the fingerprint identification detection can be turned on when the touch is valid, which can effectively reduce unnecessary startups, prevent false triggers, and reduce power consumption. At the same time, it also effectively guarantees the trigger function of fingerprint detection and makes electronic equipment Has a longer battery life.
  • the touch detection module 25 can be capacitive or optical. Specifically, the touch detection module 25 can detect finger capacitance through metal electrodes, or use a photodiode to detect finger proximity sensing, etc. Realize touch detection.
  • the fingerprint detection process of the backlit optical fingerprint recognition system is: the finger is placed in the fingerprint detection area, and the touch detection module 25 detects the effective touch of the finger, then the fingerprint detection light source 21 is turned on to perform fingerprint detection. Recognition and detection. After the fingerprint detection is completed, the optical fingerprint recognition module 22 enters the standby state, and the fingerprint detection light source 21 enters the off state.
  • the identification display module 24 can be turned on when the touch detection module 25 detects a valid touch, or it can realize the breathing light display when the optical fingerprint recognition module 22 enters the standby state.
  • the material of the back cover 10 includes any one or a combination of plastic, glass, aluminum alloy, or ceramic.
  • a through hole 11 is provided on the back cover 10 at a position corresponding to the fingerprint detection area, so that the detection light can pass through the back cover 10 to irradiate on In the fingerprint detection area, in this embodiment, in a possible situation, the back cover 10 cannot transmit the detection light emitted by the fingerprint detection light source 21, so that the return light cannot be effectively transmitted.
  • a through hole 11 is opened on the back cover 10 at a position corresponding to the fingerprint detection area, so that the detection light can be irradiated on the fingerprint detection area through the back cover 10, thereby ensuring the realization of optical fingerprint identification and detection.
  • the back The cover 10 is a back cover 10 made of ceramic material, and the fingerprint detection light source 21 is a visible light fingerprint detection light source 21, so the back cover 10 can be provided with the through hole 11.
  • the back cover 10 is formed of a material that can transmit detection light. That is, in this embodiment, the detection light can penetrate the back cover 10. That is, the return light can also pass through the back cover 10, which ensures the realization of optical fingerprint recognition. At the same time, there is no need to open a through hole 11 on the back cover 10, which helps to improve the aesthetics of the back cover 10. Improve the overall beauty of the electronic device 30.
  • the molding material of the back cover 10 can be selected according to the type of detection light.
  • the detection light is infrared light
  • the back cover 10 can be ceramic, aluminum alloy, or aluminum alloy that can transmit infrared light.
  • the back cover 10 may be made of one or more of materials such as glass, transparent plastic, etc. that can transmit visible light.
  • a blind hole 12 is provided on the back cover 10 at a position corresponding to the fingerprint detection area.
  • the blind hole 12 is set to facilitate the user to blindly press the fingerprint detection area to perform fingerprint identification. , There is no need for the user to turn the electronic device and then touch it, which is more convenient to use and improves the user experience.
  • the fingerprint detection light source 21 may be one or multiple.
  • the multiple fingerprint detection light sources 21 By setting the optical fingerprint recognition module 22 as the center of symmetry, or multiple fingerprint detection light sources 21 are provided by setting the optical fingerprint recognition module 22 as the diagonal center, specifically, the optical fingerprint recognition module
  • the fingerprint image sensor 222 in 22 is a symmetric center, so that the fingerprint detection effect of pressing the finger on the fingerprint detection area of the back cover 10 at different angles can be ensured.
  • setting the number of fingerprint detection light sources 21 to multiple is helpful to further increase the signal amount of fingerprint detection and improve the effect of fingerprint recognition.
  • the fingerprint detection light source 21 may also be circular, and the circular fingerprint detection light source 21 is arranged around the optical fingerprint recognition module 22, which can also take into account the different angles of the finger in the fingerprint detection area. Fingerprint detection effect under pressure.
  • the back optical fingerprint recognition system 20 further includes a substrate 26, which is located between the back cover 10 and the display module.
  • the substrate 26 can be located between the back cover 10 and the backlight module, and the fingerprint detection light source 21 and the optical fingerprint recognition module 22 are arranged on the side of the substrate 26 facing the back cover 10.
  • the substrate 26 is used to provide an installation place for the fingerprint detection light source 21 and the optical fingerprint identification module 22.
  • the substrate 26 may be an FPC soft board or a PCB hard board, which is not limited in this embodiment.
  • FIG. 10 is a schematic structural diagram of a backside optical fingerprint identification system provided by the second embodiment of the present invention.
  • the optical fingerprint recognition module 22 includes an optical element 221 and a fingerprint image sensor 222, and the optical element 221 is located on the fingerprint image sensor 222 near the back cover
  • the return light passes through the optical element 221 and enters the fingerprint image sensor 222 to form a fingerprint image
  • the optical element 221 is arranged between the back cover 10 and the fingerprint image sensor 222, specifically, the optical element 221 is arranged
  • the optical element 221 can modulate the return light with fingerprint information, so that the return light enters the fingerprint image sensor 222 after modulation, thereby improving the accuracy and detection effect of fingerprint recognition.
  • the detection light irradiates the finger in the fingerprint detection area of the back cover 10 to form a return light.
  • the return light passes through the optical element 221 and enters the fingerprint image sensor 222 to form a fingerprint image.
  • the fingerprint image sensor 222 converts the fingerprint image into an electrical signal, ie It can be used to compare fingerprints, realize fingerprint recognition, and help improve the accuracy of fingerprint detection and improve the effect of fingerprint recognition.
  • the optical element 221 may be a lens, a collimating hole layer, an aperture, and the like.
  • the back optical fingerprint recognition system 20 further includes a filter layer 23.
  • the filter layer 23 may be located between the optical fingerprint recognition module 22 and the back cover 10, and is connected to the optical fingerprint recognition module 22 corresponds to, specifically, the filter layer 23 can be located between the optical element 221 and the back cover 10, the filter layer 23 is used to transmit the detection light and the return light formed when the detection light irradiates the finger, and filter out The visible light entering the fingerprint recognition module, the detection light irradiates the finger in the fingerprint detection area to form return light.
  • the return light passes through the filter layer 23 and then enters the fingerprint image sensor 222 through the optical element 221, and the filter layer 23 can filter In addition to the visible light in the environment, while ensuring the realization of optical fingerprint recognition, it prevents visible light in the environment from entering the fingerprint image sensor 222 through the optical element 221, affecting the recognition of the optical fingerprint recognition module 22, and improving the accuracy of fingerprint detection. degree.
  • the filter layer 23 can also be located between the optical element 221 and the fingerprint image sensor 222, and the filter layer 23 corresponds to the fingerprint image sensor 222.
  • the detection light irradiates the finger in the fingerprint detection area to form the return light.
  • the returned light passes through the optical element 221 and then passes through the filter layer 23 and enters the fingerprint image sensor 222.
  • the filter layer 23 can filter out visible light in the environment. This ensures the realization of optical fingerprint recognition while avoiding environmental problems.
  • the visible light passes through the optical element 221 and enters the fingerprint image sensor 222, which affects the recognition of the optical fingerprint recognition module 22 and improves the accuracy of fingerprint detection.
  • the filter layer 23 may be integrated on the optical element 221 or the fingerprint image sensor 222 in an IC integration manner, or may be attached to the optical element 221 or the fingerprint image sensor 222 in an independent manner.
  • the back optical fingerprint recognition system further includes a light-permeable lamination layer 227, and the lamination layer 227 is used to bond the filter layer 23 to the optical element 221,
  • the light-permeable bonding layer 227 is specifically a light-transmitting material with a low refractive index, which has good light transmittance and a low refractive index, which can ensure a good connection between the filter layer 23 and the optical element 221 While being fixed, it also ensures that the modulation effect of the optical element 221 is not affected.
  • the type of the filter layer 23 please refer to the first embodiment, which will not be repeated in this embodiment.
  • the back optical fingerprint identification system 20 may also include an identification display module 24 and a touch detection module 25, wherein the identification display module 24 and the touch detection module 25 are both located between the back cover 10 and the optical fingerprint identification module 22, Specifically, the touch detection module 25 may be located between the identification display module 24 and the optical fingerprint recognition module 22 or between the identification display module 24 and the back cover 10.
  • the specific setting positions of the identification display module 24 and the touch detection module 25 and the specific components included please refer to the first embodiment, which will not be repeated in this embodiment.
  • the material of the back cover 10 includes any one or a combination of plastic, glass, aluminum alloy, or ceramic.
  • the back cover 10 can be provided with a through hole 11 at a position corresponding to the fingerprint detection area, so that the detection light can pass through the back cover 10 to illuminate the fingerprint detection area, or the back cover 10 can be used to detect The light-transmitting material is formed, so that there is no need to open the through hole 11, and the aesthetics of the back cover 10 is improved.
  • a blind hole 12 can be provided on the back cover 10 at a position corresponding to the fingerprint detection area, so that the user can blindly press the fingerprint identification.
  • the specific setting method Refer to the first embodiment, which will not be repeated in this embodiment.
  • the fingerprint detection light source 21 may be one or more, and the multiple fingerprint detection light sources 21 are arranged with the optical fingerprint recognition module 22 as the center of symmetry or the center of the diagonal.
  • the fingerprint detection light source 21 may be circular, and the circular fingerprint detection light source 21 is arranged around the optical fingerprint identification module 22.
  • the specific setting method please refer to the first embodiment, which will not be repeated in this embodiment.
  • the back optical fingerprint recognition system 20 may further include a substrate 26, which is located between the back cover 10 and the backlight module, and the fingerprint detection light source 21 and the optical fingerprint recognition module 22 are arranged on the substrate 26 facing toward One side of the back cover 10.
  • the substrate 26 is used to provide an installation place for the fingerprint detection light source 21 and the optical fingerprint identification module 22.
  • the substrate 26 may be an FPC soft board or a PCB hard board, which is not limited in this embodiment.
  • the back optical fingerprint recognition system 20 includes an optical element 221 and a fingerprint image sensor 222 through the optical fingerprint recognition module 22, and the optical element 221 is located on the side of the fingerprint image sensor 222 close to the back cover 10,
  • the optical element 221 can modulate the return light with fingerprint information so that it enters the fingerprint image sensor 222 after being modulated to improve the accuracy and detection effect of fingerprint recognition.
  • the detection light irradiates the finger in the fingerprint detection area of the back cover 10 to form the return light.
  • the return light passes through the optical element 221 and then enters the fingerprint image sensor 222 to form a fingerprint image, thereby realizing optical fingerprint recognition and helping Improve the accuracy of fingerprint detection and enhance the effect of fingerprint recognition.
  • FIG. 11 is a schematic structural diagram of a backside optical fingerprint identification system provided by Embodiment 3 of the present invention.
  • the optical element 221 of the optical fingerprint identification module 22 is a lens, and the convex end of the lens faces the fingerprint image sensor 222 Setting, the lens has a strong light-gathering ability, and the return light passes through the lens to form an image, so that the imaging range is larger and the fingerprint image formed is more accurate.
  • the lens is arranged between the back cover 10 and the fingerprint image sensor 222, and the lens is located at a position corresponding to the fingerprint image sensor 222.
  • the detection light irradiates the finger in the fingerprint detection area of the back cover 10 to form a return light.
  • the light passes through the lens and enters the fingerprint image sensor 222 to form a fingerprint image.
  • the fingerprint image sensor 222 converts the fingerprint image into an electrical signal, which can be used to compare fingerprints and realize optical fingerprint recognition. At the same time, the image is modulated by the lens. , Has a wider imaging range, and forms a more accurate fingerprint image, which helps to improve the accuracy of fingerprint detection.
  • the rear optical fingerprint recognition system 20 further includes a filter layer 23.
  • the filter layer 23 can be located between the lens and the fingerprint image sensor 222 or Between the lens and the back cover 10, and the filter layer 23 corresponds to the fingerprint image sensor 222, the finger whose detection light irradiates the fingerprint detection area forms return light, which passes through the lens and filter layer 23 and enters the fingerprint image
  • the filter layer 23 can filter out the visible light in the environment at the same time, so that while ensuring the realization of optical fingerprint recognition, it prevents the visible light in the environment from entering the fingerprint image sensor 222 through the optical element 221 and affecting the optical fingerprint recognition model.
  • the recognition of group 22 improves the accuracy of fingerprint detection.
  • the filter layer 23 can be integrated on the fingerprint image sensor 222 or the lens in an IC integration manner, or can be attached to the fingerprint image sensor 222 or the lens in an independent manner.
  • the two when the filter layer 23 is bonded to the lens, the two can be bonded through the bonding layer 227 that can transmit light and has a low refractive index, so as to ensure a good fixation between the filter layer 23 and the lens. It can ensure that the focusing effect of the lens is not affected.
  • the type of the filter layer 23 please refer to the first embodiment, which will not be repeated in this embodiment.
  • the back optical fingerprint identification system 20 may also include an identification display module 24 and a touch detection module 25, wherein the identification display module 24 and the touch detection module 25 are both located between the back cover 10 and the optical fingerprint identification module 22, Specifically, the touch detection module 25 may be located between the identification display module 24 and the optical fingerprint recognition module 22 or between the identification display module 24 and the back cover 10.
  • the specific setting positions of the identification display module 24 and the touch detection module 25 and the specific components included please refer to the first embodiment, which will not be repeated in this embodiment.
  • the material of the back cover 10 includes any one or a combination of plastic, glass, aluminum alloy, or ceramic.
  • the back cover 10 can be provided with a through hole 11 at a position corresponding to the fingerprint detection area, so that the detection light can pass through the back cover 10 and illuminate the fingerprint detection area. It should be noted that the through hole 11 is opened. The area must be larger than the field of view of the lens.
  • the back cover 10 may be formed of a material that can transmit the detection light, so that there is no need to open a through hole 11, which improves the aesthetics of the back cover 10.
  • a blind hole 12 can be provided on the back cover 10 at a position corresponding to the fingerprint detection area, so that the user can blindly press the fingerprint identification.
  • the fingerprint detection light source 21 may be one or more, and the multiple fingerprint detection light sources 21 are arranged with the optical fingerprint recognition module 22 as the center of symmetry or the center of the diagonal.
  • the fingerprint detection light source 21 may be circular, and the circular fingerprint detection light source 21 is arranged around the optical fingerprint identification module 22.
  • the specific setting method please refer to the first embodiment, which will not be repeated in this embodiment.
  • the back optical fingerprint recognition system 20 may further include a substrate 26, which is located between the back cover 10 and the backlight module, and the fingerprint detection light source 21 and the optical fingerprint recognition module 22 are arranged on the substrate 26 facing toward One side of the back cover 10.
  • the substrate 26 is used to provide an installation place for the fingerprint detection light source 21 and the optical fingerprint identification module 22.
  • the substrate 26 may be an FPC soft board or a PCB hard board, which is not limited in this embodiment.
  • the back optical fingerprint recognition system uses the optical element 221 as a lens, and uses the strong light-gathering ability of the lens to enlarge the imaging range, and the formed fingerprint image is more accurate, specific, specific,
  • the detection light irradiates the finger in the fingerprint detection area of the back cover 10 to form the return light.
  • the return light passes through the lens and enters the fingerprint image sensor 222 to form a fingerprint image to realize optical fingerprint recognition. At the same time, it is modulated by the lens and then imaged.
  • the wider imaging range and the formation of more accurate fingerprint images help improve the accuracy of fingerprint detection.
  • FIG. 12 is a schematic structural diagram of a back optical fingerprint identification system provided by the fourth embodiment of the present invention.
  • FIG. 13 is a schematic structural diagram of a collimating hole layer in a back optical fingerprint recognition system provided by the fourth embodiment of the present invention.
  • FIG. 14 is The fourth embodiment of the present invention provides a schematic structural diagram of yet another backside optical fingerprint identification system.
  • the optical element 221 is a collimating hole layer, and a plurality of mutually parallel light-transmitting holes 223 are opened on the collimating hole layer. , So that the return light is projected on the fingerprint image sensor 222 after passing through the light-transmitting hole 223.
  • a specific angle of light can be selected to pass through, so that other light cannot participate
  • the imaging avoids the interference of mixed light on fingerprint imaging, effectively improves the clarity of the fingerprint image, and improves the accuracy of fingerprint recognition.
  • the collimating hole layer is disposed between the back cover 10 and the fingerprint image sensor 222, and the collimating hole layer is located at a position corresponding to the fingerprint image sensor 222, and the detection light irradiates the finger in the fingerprint detection area of the back cover 10
  • the return light is formed on the upper surface, and the return light passes through the light-transmitting hole 223 on the collimating hole layer and then enters the fingerprint image sensor 222 to form a fingerprint image, which realizes the recognition of the optical fingerprint. Improve the clarity of fingerprint images and improve the accuracy of fingerprint recognition.
  • the collimating hole layer is formed of an opaque photoresist material, and a light-transmitting hole 223 for light-transmitting is opened on the collimating hole layer to achieve selective light transmission.
  • the aperture size and depth of the light-transmitting hole 223 can be set according to the required collimation degree of the collimating hole layer.
  • the ratio of the aperture of the light-transmitting hole 223 to the hole depth is greater than 5 to ensure the formation of The fingerprint image with good image quality ensures the realization of optical fingerprint recognition.
  • the backside optical fingerprint recognition system further includes a filter layer 23.
  • the filter layer 23 may be located between the collimating hole layer and the fingerprint image sensor 222, or It can be located between the collimating hole layer and the back cover 10, and the filter layer 23 corresponds to the position of the fingerprint image sensor 222.
  • the detection light irradiates the finger in the fingerprint detection area to form return light, which passes through the collimation hole layer
  • the light transmission hole 223 and the light filter layer 23 enter the fingerprint image sensor 222.
  • the light filter layer 23 can filter out the visible light in the environment, so as to ensure the realization of optical fingerprint recognition while avoiding the visible light in the environment.
  • the light hole 223 enters the fingerprint image sensor 222, which affects the recognition of the optical fingerprint recognition module 22, and improves the accuracy of fingerprint detection.
  • the filter layer 23 can be integrated on the fingerprint image sensor 222 or the collimating hole layer in an IC integration manner, or can be attached to the fingerprint image sensor 222 or the collimating hole layer in an independent manner.
  • the type of the filter layer 23 please refer to the first embodiment, which will not be repeated in this embodiment.
  • the back optical fingerprint identification system 20 may also include an identification display module 24 and a touch detection module 25, wherein the identification display module 24 and the touch detection module 25 are both located on the back cover 10 and the optical fingerprint identification Between the modules 22, specifically, the touch detection module 25 may be located between the identification display module 24 and the optical fingerprint recognition module 22, or between the identification display module 24 and the back cover 10.
  • the touch detection module 25 may be located between the identification display module 24 and the optical fingerprint recognition module 22, or between the identification display module 24 and the back cover 10.
  • the material of the back cover 10 includes any one or a combination of plastic, glass, aluminum alloy, or ceramic.
  • a through hole 11 can be provided on the back cover 10 at a position corresponding to the fingerprint detection area, so that the detection light can pass through the back cover 10 and illuminate the fingerprint detection area.
  • the back cover 10 may be formed of a material that can transmit the detection light, so that there is no need to open a through hole 11, which improves the aesthetics of the back cover 10.
  • a blind hole 12 can be provided on the back cover 10 at a position corresponding to the fingerprint detection area, so that the user can blindly press the fingerprint identification.
  • the fingerprint detection light source 21 may be one or more, and the multiple fingerprint detection light sources 21 are arranged with the optical fingerprint recognition module 22 as the center of symmetry or the center of the diagonal.
  • the fingerprint detection light source 21 may be circular, and the circular fingerprint detection light source 21 is arranged around the optical fingerprint identification module 22.
  • the specific setting method please refer to the first embodiment, which will not be repeated in this embodiment.
  • the back optical fingerprint recognition system 20 may further include a substrate 26, which is located between the back cover 10 and the backlight module, and the fingerprint detection light source 21 and the optical fingerprint recognition module 22 are arranged on the substrate 26 facing toward One side of the back cover 10.
  • the substrate 26 is used to provide an installation place for the fingerprint detection light source 21 and the optical fingerprint identification module 22.
  • the substrate 26 may be an FPC soft board or a PCB rigid board, which is not limited in this embodiment.
  • the backside optical fingerprint recognition system uses the optical element 221 as a collimating hole layer, and a plurality of light-transmitting holes 223 are formed on the collimating hole layer, so that when light passes through the collimating hole layer, the light-transmitting holes 223 can selectively transmit the optics parallel to the axis of the light-transmitting hole 223, avoiding the interference of intertwined light on fingerprint imaging, effectively improving the clarity of the fingerprint image, and improving the accuracy of fingerprint recognition.
  • the light passes through the light-transmitting hole 223 on the collimating hole layer and then enters the fingerprint image sensor 222 to form a fingerprint image, which realizes the recognition of optical fingerprints. At the same time, the clearness of the fingerprint image is effectively improved by the selection of the transmission of the collimating hole. Enhance the accuracy of fingerprint recognition.
  • FIG. 15 is a schematic diagram of the structure of a back optical fingerprint recognition system provided by the fifth embodiment of the present invention
  • FIG. 16 is a schematic diagram of the micro lens layer in the back optical fingerprint recognition system provided by the fifth embodiment of the present invention
  • FIG. 17 is the present invention
  • the fifth embodiment of the invention provides a partially enlarged schematic diagram of a backside optical fingerprint recognition system.
  • FIG. 18 is a partially enlarged schematic diagram of another backside optical fingerprint recognition system provided by the fifth embodiment of the present invention.
  • FIG. 19 is an embodiment of the present invention.
  • FIG. 20 is a schematic diagram of another backside optical fingerprint recognition system provided by Embodiment 5 of the present invention.
  • the optical element 221 includes: a microlens layer 224 and an aperture layer 225.
  • the microlens layer 224 and the light A light-transmitting material layer is arranged between the diaphragm layers 225, wherein the micro lens layer 224 is arranged close to the back cover 10, and the convex end of the micro lens layer 224 faces the back cover 10, wherein the micro lens layer 224 has a strong focus Optical properties can expand the breadth of imaging and make fingerprint images more accurate.
  • the diaphragm layer 225 includes a diaphragm plate. As shown in FIG.
  • a plurality of mutually parallel diaphragm holes 226 are opened on the diaphragm plate, so that the returning light passes through the microlens layer 224 and the light-transmitting material layer in turn.
  • the aperture 226 is irradiated on the fingerprint image sensor 222, so that when the light passes through the aperture 226 on the aperture plate, the transparent aperture 226 selectively transmits light to improve the clarity of the fingerprint image
  • the optical element 221 is made to include a micro lens layer 224 and a diaphragm layer 225, and the returning light first passes through the micro lens layer 224, then passes through the diaphragm hole 226 of the diaphragm layer 225 and enters the fingerprint image sensor.
  • the light element includes a microlens layer 224 and an aperture layer 225. Since the thickness of the aperture layer 225 is smaller, the imaging distance required for the microlens layer 224 is smaller. , Making the formed optical element 221 thinner, thereby making the entire optical fingerprint recognition system thinner, helping to meet the increasingly thinner needs of the electronic device 30, and the return light passes through the microlens and the diaphragm layer 225 to form an image. The higher the collimation degree, the clearer the fingerprint image.
  • the detection light irradiates the finger on the fingerprint detection area of the back cover 10 to form the return light.
  • the return light first passes through the microlens layer 224 and then passes through the light-transmitting material, and then passes through the aperture 226 of the aperture layer 225. After passing through, it enters the fingerprint image sensor 222 to form a fingerprint image, which realizes the recognition of optical fingerprints, and the return light is sequentially modulated by the microlens layer 224 and the diaphragm layer 225 for imaging, which expands the imaging breadth range and improves the fingerprint image The clarity effectively improves the accuracy of fingerprint recognition.
  • the microlens layer 224 is formed by arranging a plurality of microlenses in parallel. There are no other requirements for the material type of the light-transmitting material, as long as the light-transmitting property does not affect the transmission of light.
  • the diaphragm layer 225 may include a multi-layer laminated diaphragm plate to make the light progress. After multiple selections pass through, it enters the fingerprint image sensor 222, which effectively improves the clarity of the formed fingerprint image.
  • the backside optical fingerprint recognition system 20 further includes a filter layer 23, which can be located between the diaphragm layer 225 and the fingerprint image sensor 222, It can also be located between the microlens layer 224 and the back cover 10, and the filter layer 23 corresponds to the position of the fingerprint image sensor 222.
  • the detection light irradiates the finger in the fingerprint detection area to form return light, which passes through the microlens,
  • the aperture 226 of the aperture layer 225 and the filter layer 23 enter the fingerprint image sensor 222.
  • the filter layer 23 can filter out the visible light in the environment, so as to ensure the realization of optical fingerprint recognition while avoiding the environment Visible light enters the fingerprint image sensor 222, which affects the recognition of the optical fingerprint recognition module 22, and improves the accuracy of fingerprint detection.
  • the filter layer 23 may be integrated on the fingerprint image sensor 222 or the microlens layer 224 in an IC integration manner, or may be attached to the fingerprint image sensor 222 or the microlens layer 224 in an independent manner.
  • the filter layer 23 when the filter layer 23 is bonded to the microlens layer 224, as shown in FIG. 21, the two can be bonded through a light-transmissive, low-refractive bonding layer 227, so as to ensure the filter layer 23 While being well fixed to the micro lens layer 224, it also ensures that the light condensing effect of the micro lens is not affected.
  • the type of the filter layer 23 please refer to the first embodiment, which will not be repeated in this embodiment.
  • the back optical fingerprint identification system 20 may also include an identification display module 24 and a touch detection module 25, wherein the identification display module 24 and the touch detection module 25 are both located on the back cover 10 and the optical fingerprint identification Between the modules 22, specifically, the touch detection module 25 may be located between the identification display module 24 and the optical fingerprint recognition module 22 or between the identification display module 24 and the back cover 10.
  • the touch detection module 25 may be located between the identification display module 24 and the optical fingerprint recognition module 22 or between the identification display module 24 and the back cover 10.
  • the material of the back cover 10 includes any one or a combination of plastic, glass, aluminum alloy, or ceramic.
  • a through hole 11 can be provided on the back cover 10 at a position corresponding to the fingerprint detection area, so that the detection light can pass through the back cover 10 and illuminate the fingerprint detection area.
  • the back cover 10 may be formed of a material that can transmit the detection light, so that there is no need to open a through hole 11, which improves the aesthetics of the back cover 10.
  • a blind hole 12 can be provided on the back cover 10 at a position corresponding to the fingerprint detection area, so that the user can blindly press the fingerprint identification.
  • the fingerprint detection light source 21 may be one or more, and the multiple fingerprint detection light sources 21 are arranged with the optical fingerprint recognition module 22 as the center of symmetry or the center of the diagonal.
  • the fingerprint detection light source 21 may be circular, and the circular fingerprint detection light source 21 is arranged around the optical fingerprint identification module 22.
  • the specific setting method please refer to the first embodiment, which will not be repeated in this embodiment.
  • the back optical fingerprint recognition system 20 may further include a substrate 26, which is located between the back cover 10 and the backlight module, and the fingerprint detection light source 21 and the optical fingerprint recognition module 22 are arranged on the substrate 26 facing toward One side of the back cover 10.
  • the substrate 26 is used to provide an installation place for the fingerprint detection light source 21 and the optical fingerprint identification module 22.
  • the substrate 26 may be an FPC soft board or a PCB hard board, which is not limited in this embodiment.
  • the back optical fingerprint recognition system is implemented by making the optical element 221 include a microlens layer 224 and an aperture layer 225.
  • a transparent material layer is arranged between the microlens layer 224 and the aperture layer 225, and the microlens
  • the layer 224 is arranged close to the back cover 10, and the protruding end of the micro lens layer 224 faces the back cover 10;
  • the diaphragm layer 225 includes a diaphragm plate, and a plurality of mutually parallel diaphragm holes 226 are opened on the diaphragm plate. So that the returning light passes through the microlens layer 224 and the light-transmitting material layer and then passes through the aperture 226 to irradiate the fingerprint image sensor 222. Even if the returning light passes through the lens and the aperture layer 225 in sequence, the image is formed, which expands the imaging range at the same time. The clarity of fingerprint images is improved, and the accuracy of optical fingerprint recognition is further improved.
  • the electronic device may specifically be a liquid crystal display device, electronic paper, mobile phone, tablet computer, television, notebook computer, Digital photo frames, navigators, fingerprint locks and other electronic products or components.
  • 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

本发明提供一种背后光学指纹识别系统及电子装置，该背后光学指纹识别系统包括：指纹检测光源和光学指纹识别模组，指纹检测光源和光学指纹识别模组位于显示模组和背后盖板之间，且指纹检测光源用于向位于背后盖板上的指纹检测区域发射探测光，探测光在照射到指纹检测区域的手指时形成返回光，光学指纹识别模组用于接收返回光并形成指纹图像，即从指纹检测光源发出的探测光照射到指纹检测区域的手指以及从手指反射的返回光进入光学指纹识别模组的传输过程中均不会受到背光模组等不透光膜层的影响，实现了电子装置背后模式下的光学指纹识别检测，解决了现有光学指纹识别模组在电子装置的背后模式下无法实现指纹检测的问题。

Description

一种背后光学指纹识别系统及电子装置 技术领域
本申请涉及指纹识别技术领域，尤其涉及一种背后光学指纹识别系统及电子装置。
背景技术
指纹识别技术是指通过指纹识别模组感应、分析指纹的谷和脊的信号来识别指纹信息，具有安全性高，且操作方便快捷的优点，而被广泛的应用于电子产品中。指纹成像技术的实现方式有光学成像、电容成像、超声成像等多种技术，其中，光学指纹识别技术因其具有穿透能力强、支持全屏摆放、产品结构设计简单等特点，而逐渐成为指纹识别技术的主流，被广泛的应用于电子设备中。
目前，光学指纹识别模组在显示屏中设置时，光学识别模组位于显示屏下，具体的，如在LCD显示屏模式下，显示模组包括液晶显示面板和背光模组，光学指纹识别模组位于背光模组和液晶显示面板之间，且光学指纹识别模组的光学传感区域朝向液晶显示面板，通常光学指纹识别模组设置在液晶显示面板的非显示区域，即光学指纹识别模组位于屏幕的边缘处，指纹检测区域可位于屏幕显示区域下放，光线被指纹检测区域的手指折射后返回带有指纹信息的折射光，折射光照射在光学指纹识别模组并被光学指纹识别模组接收，形成指纹图像，指纹图像与存储的指纹图像进行对比完成指纹的识别。
然而，随着需求的不断增长，为减小指纹识别模组对占屏比的影响，背后的指纹识别方式逐渐受到了用户的青睐，由于LCD屏为被动发光，其背光模组包括的钢板以及反射膜等不透光，且背光模组内的扩散膜以及增光膜对光线还分别具有雾化效果和方向约束性等，从而导致光学指纹识别模组在LCD屏背后模式下无法实现指纹的检测。
发明内容
本发明提供一种背后光学指纹识别系统及电子装置，以解决现有光学指纹识别模组在电子装置的背后模式下无法实现指纹检测的问题。
本发明的第一方面提供一种背后光学指纹识别系统，应用于具有显示模组和背后盖板的电子装置，其特征在于，所述背后光学指纹识别系统包括：指纹检测光源和光学指纹识别模组；
所述指纹检测光源和所述光学指纹识别模组位于所述显示模组和所述背后盖板之间，且所述指纹检测光源用于向位于所述背后盖板上的指纹检测区域发射探测光，所述探测光在照射到所述指纹检测区域的手指时形成返回光，所述光学指纹识别模组用于接收所述返回光并形成指纹图像。
在本发明的具体实施方式中，所述光学指纹识别模组包括光学元件和指纹图像传感器，所述光学元件位于所述指纹图像传感器靠近所述背后盖板的一侧，且所述光学元件设置在与所述指纹图像传感器相应位置处，所述返回光透过所述光学元件且进入所述指纹图像传感器以形成指纹图像。
在本发明的具体实施方式中，所述光学元件为透镜，所述透镜凸起的一端朝向所述指纹图像传感器。
在本发明的具体实施方式中，所述光学元件为准直孔层，所述准直孔层上开设多个相互平行的透光孔，以使所述返回光经过所述透光孔后投射在指纹图像传感器上。
在本发明的具体实施方式中，所述光学元件包括：微透镜层和光阑层，所述微透镜层与所述光阑层之间设置有透光材料层，所述微透镜层靠近所述背后盖板设置，且所述微透镜层凸起的一端朝向所述背后盖板；
所述光阑层包括光阑板，所述光阑板上开设有多个相互平行的光阑孔，以使所述返回光再依次经过所述微透镜层和所述透光材料层后经过所述光阑孔照射在所述指纹图像传感器上。
在本发明的具体实施方式中，所述光阑层包括多层层叠设置的光阑板。
在本发明的具体实施方式中，所述指纹检测光源包括可见光指纹检测光源或非可见光指纹检测光源。
在本发明的具体实施方式中，所述指纹检测光源为红外指纹检测光源。
在本发明的具体实施方式中，还包括滤光层，所述滤光层位于所述光学指纹识别模组和所述背后盖板之间且与所述光学指纹识别模组相对应；或者， 所述滤光层位于所述光学指纹识别模组的光学元件和指纹图像传感器之间且与所述指纹图像传感器相对应。
在本发明的具体实施方式中，还包括可透光的贴合层，所述贴合层用于将所述滤光层与所述光学元件贴合。
在本发明的具体实施方式中，还包括标识显示模块，所述标识显示模块位于所述背后盖板与所述光学指纹识别模组之间，所述标识显示模块包括可见光源和匀光板，所述可见光源并列设置在所述匀光板的一侧。
在本发明的具体实施方式中，所述标识显示模块还包括：反射膜，所述反射膜设置在所述匀光板和所述可见光源朝向背后盖板一侧的上方，且所述反射膜用于将指纹检测光源发出的探测光透过以及用于将所述可见光源发出的可见光反射。
在本发明的具体实施方式中，还包括触摸检测模块，所述触摸检测模块位于所述背后盖板与所述光学指纹识别模组之间。
在本发明的具体实施方式中，所述背后盖板上与所述指纹检测区域相应的位置处设置通孔，以使所述探测光可穿过所述背后盖板照射在所述指纹检测区域上。
在本发明的具体实施方式中，所述背后盖板由可使所述探测光透过的材料形成。
在本发明的具体实施方式中，所述背后盖板上与所述指纹检测区域相应的位置处设置盲孔。
在本发明的具体实施方式中，所述指纹检测光源为一个或多个，多个所述指纹检测光源以光学指纹识别模组为对称中心或对角线中心的方式设置；或者，
所述指纹检测光源为圆环状，所述指纹检测光源环绕所述光学指纹识别模组设置。
在本发明的具体实施方式中，还包括基板，所述基板位于所述背后盖板与所述显示模组之间，且所述指纹检测光源、所述光学指纹识别模组设置在所述基板朝向所述背后盖板的一面上。
在本发明的具体实施方式中，所述背后盖板的材质包括塑料、玻璃、铝合金或陶瓷中的任一种或多种组合。
本发明的第二方面提供一种电子装置，其特征在于，包括上述任一所述的背后光学指纹识别系统。
本发明提供的一种背后光学指纹识别系统及电子装置，该背后光学指纹识别系统通过包括指纹检测光源和光学指纹识别模组，并使指纹检测光源和光学指纹识别模组位于显示模组和背后盖板之间，指纹检测光源用于向位于背后盖板上的指纹检测区域发射探测光，即使该电子装置包括有背光模组等不透光的膜层，该探测光从指纹检测光源出发照射在指纹检测区域过程中也不会受到背光模组等的影响，探测光照射到指纹检测区域上的手指时被反射形成返回光，该返回光就携带了指纹信息，且该返回光在传输的过程中也不会受到背光模组等的影响，该返回光穿过背后盖板后照射到光学指纹识别模组上，光学指纹识别模组用于接收该返回光就能够根据该返回光形成指纹图像，将该指纹图像转换成电信号传输即可进行指纹的比对识别，从而实现了光学指纹的检测，即实现了电子装置背后模式下的光学指纹识别检测，解决了现有光学指纹识别模组在电子装置的背后模式下无法实现指纹检测的问题。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例一提供的一种背后光学指纹识别系统的结构示意图；
图2为本发明实施例一提供的又一种背后光学指纹识别系统的结构示意图；
图3是本发明实施例一提供的又一种背后光学指纹识别系统的结构示意图；
图4是本发明实施例一提供的又一种背后光学指纹识别系统的结构示意图；
图5是本发明实施例一提供的一种背后光学指纹识别系统指纹识别流程图；
图6是本发明实施例一提供的一种具有背后光学指纹识别系统的电子设 备；
图7是本发明实施例一提供的又一种具有背后光学指纹识别系统的电子设备；
图8是本发明实施例一提供的又一种具有背后光学指纹识别系统的电子设备；
图9是本发明实施例一提供的又一种具有背后光学指纹识别系统的电子设备；
图10是本发明实施例二提供的一种背后光学指纹识别系统的结构示意图；
图11是本发明实施例三提供的一种背后光学指纹识别系统的结构示意图；
图12是本发明实施例四提供的一种背后光学指纹识别系统的结构示意图；
图13是本发明实施例四提供的一种背后光学指纹识别系统中准直孔层的结构示意图；
图14是本发明实施例四提供的又一种背后光学指纹识别系统的结构示意图；
图15是本发明实施例五提供的一种背后光学指纹识别系统的结构示意图；
图16是本发明实施例五提供的一种背后光学指纹识别系统中微透镜层的结构示意图；
图17是本发明实施例五提供的一种背后光学指纹识别系统的局部放大结构示意图；
图18是本发明实施例五提供的又一种背后光学指纹识别系统的局部放大结构示意图；
图19是本发明实施例五提供的另一种背后光学指纹识别系统的局部放大结构示意图；
图20是本发明实施例五提供的又一种背后光学指纹识别系统的结构示意图。
附图标记说明：
背后盖板-10；通孔-11；盲孔-12；背后光学指纹识别系统-20；指纹检测光源-21；光学指纹识别模组-22；光学元件-221；指纹图像传感器-222；透光孔-223；微透镜层-224；光阑层-225；光阑孔-226；贴合层-227；滤光层-23；标识显示模块-24；可见光源-241；匀光板-242；反射膜-243；触摸检测模块-25；基板-26；电子设备-30。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
下面以具体地实施例对本发明的技术方案进行详细说明。下面这几个具体的实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例不再赘述。
实施例一
图1为本发明实施例一提供的一种背后光学指纹识别系统的结构示意图，图2为本发明实施例一提供的又一种背后光学指纹识别系统的结构示意图，图3是本发明实施例一提供的又一种背后光学指纹识别系统的结构示意图，图4是本发明实施例一提供的又一种背后光学指纹识别系统的结构示意图，图5是本发明实施例一提供的一种背后光学指纹识别系统指纹识别流程图，图6是本发明实施例一提供的一种具有背后光学指纹识别系统的电子设备，图7是本发明实施例一提供的又一种具有背后光学指纹识别系统的电子设备，图8是本发明实施例一提供的又一种具有背后光学指纹识别系统的电子设备，图9是本发明实施例一提供的又一种具有背后光学指纹识别系统的电子设备。
本实施例提供一种背后光学指纹识别系统，应用于具有显示模组和背后盖板的电子装置，电子装置如手机、平板电脑等通常包括壳体和显示屏幕，壳体包括背后盖板和具有缺口的正面壳体，显示屏幕设置在缺口中，背后盖板和正面壳体形成空腔，用于放置显示模组以实现显示屏幕的显示，该显示 模组可以是OLED屏显示模组，也可以是LCD屏显示模组，其中，LCD屏幕为被动发光，显示模组包括液晶显示面板和背光模组，背光模组位于显示面板的背后且可提供光源，其功能是供应充足的亮度与分布均匀的光源，以使显示模组能够正常的显示影像。
光学指纹识别模组在LCD或者OLED显示屏幕中设置时，通常设置在显示面板和显示模组之间，具体的，如LCD屏中设置时，光学指纹识别模组设置在显示面板与背光模组之间，而为避免光学指纹识别模组影响显示面板的显示效果，光学指纹识别模组设置在与显示面板的非显示区域相对的位置处，即将光学指纹识别模组设置在屏幕的边缘处，指纹检测区域可以位于屏幕显示区域下方，也可以设置在屏幕的边缘处，这样光学指纹识别模组的设置就会对显示屏幕的占屏比造成影响，而随着用户对大屏幕以及全屏电子设备的追求，为增大占屏比，将指纹检测区域后置的背后指纹识别方式日益受到用户的青睐，然而，现有的背后指纹识别多为电容式指纹识别，这是由于背光模组作为光源，包括的钢板以及反射膜等均不透光，且背光模组所包括的扩散膜以及增光膜等对光线还具有雾化以及方向约束性等效果，这样就导致位于背光模组和显示面板间的检测光源无法穿过背光模组而照射到位于背光模组后的光线指纹识别模组上，从而导致光学指纹识别模组无法实现指纹的识别检测。
基于上述问题，本实施例提供的背后光学指纹识别系统，其中，背后是指位于电子装置的背后，即指纹检测区域设置在电子装置的背后盖板背离显示面板的一面上。如图1所示，该光学指纹识别系统包括：指纹检测光源21和光学指纹识别模组22，指纹检测光源21用于发射探测光以照射在指纹检测区域的手指上，光学指纹识别模组22用于接收带有指纹信息的返回光，并将该返回光形成指纹图像，将该指纹图像转换成电学信号，以对指纹进行比对识别，其中，在本实施例中，指纹检测光源21和光学指纹识别模组22均位于显示模组和背后盖板10之间，具体的，当显示为LCD屏模式时，指纹检测光源21和光学指纹识别模组22均位于背光模组和背后盖板10之间，指纹检测光源21向位于背后盖板10上的指纹检测区域发射探测光，即使该电子装置具有如背光模组等不透光的膜层，该探测光从指纹检测光源21出发照射在指纹检测区域过程中不会受到背光模组等的影响，探测光照射到指纹检测区域上的 手指时被反射形成返回光，该返回光就携带了指纹信息，且该返回光在传输的过程中也不会受到背光模组等的影响，该返回光透过背后盖板10后照射到光学指纹识别模组22上，光学指纹识别模组22接收该返回光就能够根据该返回光形成指纹图像，将该指纹图像转换成电信号传输即可进行指纹的比对识别，从而实现了光学指纹的检测。
需要说明的是，在本实施例中，光学指纹识别模组22的传感区域朝向背后盖板10的一面，即经过手指反射形成的返回光在透过背后盖板10后直接照射在光学指纹识别模组22的传感区域，以便于光学指纹识别模组22接收该返回光，并根据该返回光形成指纹图像。
在本实施例中，需要进行指纹的识别检测时，将手指放置在电子设备30背后盖板10的指纹检测区域上，指纹检测光源21向指纹检测区域发射探测光，该探测光在照射到指纹检测区域上的手指上时，被手指反射形成带有手指信息的返回光，该返回光经过背后盖板10后照射在光学指纹识别模组22上，光学指纹识别模组22接收该返回光，并根据该返回光带有的信息形成指纹图像，将该指纹图像转换成电学信号后即可对该指纹信息进行比对检测，从而实现背后的光学指纹识别。
需要说明的是，在本实施例中，对背后盖板10的厚度并无其他要求，能够使探测光以及返回光透过即可。与电容式指纹识别相比，电容式指纹可适用的盖板的厚度有限。而由于光学指纹识别模组的指纹信息通过光路传输，其对背后盖板10的厚度要求较小，能够支撑更厚的背后盖板10厚度。
其中，在本实施例中，如图1所示，指纹检测光源21和光学指纹识别模组22可以并列设置在背光模组和背后盖板10之间，两者也可以通过其他设置方式位于背光模组和背后盖板10之间，能够保证指纹检测光源21的探测光可以照射在背后盖板10上的指纹检测区域上，且该光学指纹识别模组22能够接收手指反射形成的返回光即可。对指纹检测光源21和光学指纹识别模组22在背光模组和背后盖板10之间的具体设置位置也并无其他要求，同样的，能够实现各自的功能即可。
在本实施例中，指纹检测区域可以是在背后盖板10上划定的一部分或多部分区域，也可以是覆盖整个背后盖板10的区域，当指纹检测区域只是在背后盖板10上划定的一部分区域时，以尺寸较小的移动终端为例，如图6至图9 所示，指纹检测区域可以位于背后盖板10竖直方向上的中部往上部分的区域内(如位于竖直背后盖板10的四分之三或三分之二处等)，以便于用户在拿取设备时进行指纹检测识别，提高用户的体验。
在本实施例中，光学指纹识别模组22可以是现有技术中的光学指纹识别模组，具体的，可以包括光学调制器件以及光学图像传感器件等，还可包括其它一些器件，具体的设置方式可参照现有技术，在本实施例中不再赘述。
本实施例提供的一种背后光学指纹识别系统20，通过包括指纹检测光源21和光学指纹识别模组22，并使指纹检测光源21和光学指纹识别模组22位于显示模组和背后盖板10之间，指纹检测光源21用于向位于背后盖板10上的指纹检测区域发射探测光，即使该电子装置包括有背光模组等不透光的模层，该探测光从指纹检测光源21出发照射在指纹检测区域过程中不会受到背光模组等的影响，探测光照射到指纹检测区域上的手指时被反射形成返回光，该返回光就携带了指纹信息，且该返回光在传输的过程中也不会受到背光模组等的影响，该返回光透过背后盖板10后照射到光学指纹识别模组22上，光学指纹识别模组22用于接收该返回光就能够根据该返回光形成指纹图像，将该指纹图像转换成电信号传输即可进行指纹的比对识别，从而实现了光学指纹的检测，即实现了电子装置背后模式下的光学指纹识别检测，解决了现有光学指纹识别模组在电子装置的背后模式下无法实现指纹检测的问题。
进一步的，在本实施例中，指纹检测光源21包括可见光指纹检测光源或非可见光指纹检测光源，其中，可见光指纹检测光源是指能够发出可见光的指纹检测光源，非可见指纹检测光源是指能够发出非可见光的指纹检测光源，即指纹检测光源发出的探测光为可见光或者指纹检测光源发出的探测光为非可见光。其中，使指纹检测光源21为非可见光指纹检测光源，发出的探测光为非可见光，这样在进行指纹检测时，指纹检测光源21发出的光照射在指纹检测区域时，探测光对用户是不可见的，与以可见光作为探测光相比，在指纹检测时，检测区域不会产生可见的亮度，可避免在每次检测时产生亮度，降低用户的使用体验。
在本实施例中，指纹检测光源21可以为发光二极管(LED)、垂直腔面发射激光器(VCSEL)以及激光二极管(Laser Diode)等，在本实施例中不做限制。
其中，在本实施例中，指纹检测光源21为红外指纹检测光源，即指纹检测光源21发出的探测光为红外光，红外光具有较好的穿透性，可穿透如陶瓷、塑料以及某些金属，可便于红外探测光透过背后壳体后照射在光学指纹识别模组22上，无需在背后壳体上开设专用的光路，有助于提高背后壳体的美观性，也有助于拓宽背后壳体的制作材料范围。
进一步的，在本实施例中，该背后光学指纹识别系统20还包括滤光层，滤光层位于光学指纹识别模组22和背后盖板10之间且与光学指纹识别模组22相对应。在进行指纹检测时，从指纹检测光源21发出的探测光照射在背后盖板10上的指纹检测区域上，探测光在手指的反射下形成返回光，返回光照射透过背后盖板10后照射在光学指纹识别模组22上，同时环境中的自然光也会照射在光学指纹识别模组22上，这样就会对指纹识别产生干扰，而在本实施例中，在光学指纹识别模组22和背后盖板10之间设置滤光层，滤光层对进入光学指纹识别模组22中的光进行透过与滤除，具体的，该滤光层用于使探测光以及探测光照射到手指时形成的返回光透过，并滤除进入指纹识别模组中的可见光，在返回光经过滤光层进入光学指纹识别模组22时，该滤光层对返回光具有很好的透过性，并可以滤除环境中的可见光，这样就在保证实现光学指纹识别的同时，可避免环境中的可见光进入光学指纹识别模组22中，影响光学指纹识别模组22的识别，有效的避免了环境中的可见光对指纹检测的干扰，提高了指纹检测的精准度。
需要说明的是，在本实施例中，当探测光也为可见光时，应使探测光的光波长与主要针对滤除的可见光的光波长不同，以保证光学指纹识别的可实现。
在本实施例中，该滤光层可包括滤光片，滤光片的类型可根据指纹检测光源21的具体类型进行选择，如指纹检测光源21为红外指纹检测光源21，其发出的探测光为红外光，则滤光片的类型为可使红外光透过，并滤除可见光的滤光片。
进一步的，在本实施例中，如图2所示，该背后光学指纹识别系统20还包括标识显示模块24，标识显示模块24位于背后盖板10与光学指纹识别模组22之间，具体的，标识显示模块24可与指纹检测区域的位置相对应，标识显示模块24可用于显示如图像、数字、文字以及多种结合的标识等，这样 可用于增加电子设备的美观，同时标识显示模块的设置，便于用户识别指纹检测区域的具体位置，便于使用。该标识可以是代表该电子设备生产标识，或者该电子设备机型标识，或者是其它类型的标识等。
其中，在本实施例中，如图2和图3所示，该标识显示模块24包括可见光源241和匀光板242，可见光源241并列设置在匀光板242的一侧，可见光用于为标识的显示提供光源。需要说明的是，当该背后光学识别系统设置有该标识显示模块24时，背后盖板10与标识显示模块24相对应的位置处应为可使可见光透过的材料，以保证标识显示模块的显示。
在本实施例中，该可见光源241可以是呼吸灯等，以使标识实现在待机状态的显示，进一步提高电子设备的美观性，同时提高用户的体验。
在本实施例中，如图2所示，该标识显示模块24还包括：反射膜243，反射膜243设置在匀光板242和可见光源241朝向背后盖板10一侧的上方，且反射膜243用于将指纹检测光源21发出的探测光透过以及用于将可见光源241发出的可见光反射，即反射膜243对探测光以及返回光具有很好的透过性，而对可见光具有较高的反射性，这样返回光能够很好的透过反射膜243进入光学指纹识别模组22中，保证光学指纹检测不受影响，同时，该反射膜243对可见光的高反射率，可以保证标识显示模组的可见光源241发出的光可以充分的从背后盖板10射出，保证标识的显示亮度。
在本实施例中，该反射膜243的具体类型可根据探测光的类型选择，如探测光为红外光，则该反射膜243可以是对红外透过率高，而对可见光反射率高的反射膜243，该反射膜243可以是现有技术中的反射膜，其成型的具体材质可参见现有技术，在本实施例中不再赘述。
进一步的，在本实施例中，如图3所示，该光学指纹识别系统还包括触摸检测模块25，触摸检测模块25用于识别手指的触摸，以启动指纹检测识别。该触摸检测模块25位于背后盖板10与光学指纹识别模组22之间，具体的，当该背后光学指纹识别系统还包括标识显示模块24时，该触摸检测模块25可以位于标识显示模块24与光学指纹识别模组22之间，也可以位于标识显示模块24与背后盖板10之间，其中，触摸检测模块25可与指纹检测区域相对应，触摸检测模块25可识别手指有效的触摸到了指纹检测区域，在触摸有效时才能够开启指纹的识别检测，这样可有效的减少不必要的启动，防止 误触发，并降低了功耗，同时也有效的保证了指纹检测的触发功能，使电子设备具有更长的续航时长。
在本实施例中，触摸检测模块25可以使用电容式或者光学式，具体的，该触摸检测模块25可以通过金属电极检测手指电容，或通过光电二极管(Photo diode)用于检测手指接近感应等方式实现触摸检测。
在本实施例中，如图5所示，背光光学指纹识别系统的指纹检测流程为：手指放置在指纹检测区域，触摸检测模块25检测到手指的有效触摸，则开启指纹检测光源21执行指纹的识别检测，待指纹检测完毕后光学指纹识别模组22进入待机状态，指纹检测光源21进入关闭状态。其中，标识显示模块24可以在触摸检测模块25检测到有效触摸时开开，也可以在光学指纹识别模组22进入待机状态的情况下实现呼吸灯显示。
进一步的，在本实施例中，背后盖板10的材质包括塑料、玻璃、铝合金或陶瓷中的任一种或多种组合。
其中，在本实施例的一种实施方式中，如图2所示，背后盖板10上与指纹检测区域相应的位置处设置通孔11，以使探测光可透过背后盖板10照射在指纹检测区域上，在本实施例中，可能的一种情况下，背后盖板10不能使指纹检测光源21发出的探测光透过，这样也不能使返回光有效的透过，则此时可在背后盖板10上与指纹检测区域相应的位置开设通孔11，使探测光可以透过背后盖板10照射在指纹检测区域上，从而保证了实现光学指纹的识别检测，具体的，如背后盖板10为陶瓷材质的背后盖板10，指纹检测光源21为可见光指纹检测光源21，则背后盖板10上可设置该通孔11。
其中，需要说明的是，在本实施例中，对通孔11的大小以及形状等并无其它要求，能够使探测光以及返回光透过，实现光学指纹识别功能即可。
在本实施例的另一种实施方式中，如图1所示，背后盖板10由可使探测光透过的材料形成，即在本实施例中，探测光可透过背后盖板10，也即返回光也可从背后盖板10透过，这样就保证了光学指纹识别的实现，同时，无需在背后盖板10上开设通孔11，有助于提高背后盖板10的美观性，提升电子设备30的整体美感。
具体的，在本实施例中，背后盖板10的成型材料可根据探测光的类型进行选择，如探测光为红外光，背后盖板10可以是能够使红外光透过的陶瓷、 铝合金、玻璃以及塑料等材质中的一种或多种构成。如探测光为可见光，背后盖板10可以是能够使可见光透过的玻璃、透明塑料等材质中的一种或多种构成。
其中，在本实施例中，如图4所示，背后盖板10上与指纹检测区域相应的位置处设置盲孔12，盲孔12的设置可便于用户盲按指纹检测区域来进行指纹的识别，无需用户将电子设备翻转后再进行触摸，使用更加的便捷，提高了用户的体验。
进一步的，在本实施例中，如图6至图9所示，指纹检测光源21可以为一个，或者也可以是多个，当指纹检测光源21为多个时，多个的指纹检测光源21通过以光学指纹识别模组22为对称中心的方式设置，或者，多个的指纹检测光源21通过以光学指纹识别模组22为对角线中心的方式设置，具体的，以光学指纹识别模组22中的指纹图像传感器222为对称中心，这样就能够保证手指在背后盖板10的指纹检测区域上不同角度按压下的指纹检测效果。另外，将指纹检测光源21的数目设置为多个，有助于进一步增加指纹检测的信号量，提高指纹识别的效果。
在本实施例中，如图9所示，指纹检测光源21还可以是圆环状，圆环状的指纹检测光源21环绕光学指纹识别模组22设置，同样可兼顾手指在指纹检测区域不同角度按压下的指纹检测效果。
进一步的，在本实施例中，如图1至图4所示，该背后光学指纹识别系统20还包括基板26，基板26位于背后盖板10与显示模组之间，具体的，当显示模组包括背光模组时，该基板26可位于背后盖板10与背光模组之间，指纹检测光源21、光学指纹识别模组22设置在基板26朝向背后盖板10的一面上。基板26用于为指纹检测光源21以及光学指纹识别模组22提供设置场所，该基板26可以是FPC软板或PCB硬板，在本实施例中不做限制。
实施例二
图10是本发明实施例二提供的一种背后光学指纹识别系统的结构示意图。
进一步的，如图10所示，在实施例一的基础上，在本实施例中，光学指纹识别模组22包括光学元件221和指纹图像传感器222，光学元件221位于 指纹图像传感器222靠近背后盖板10的一侧，返回光透过光学元件221且进入指纹图像传感器222以形成指纹图像，即光学元件221设置在背后盖板10和指纹图像传感器222之间，具体的，光学元件221设置在与指纹图像传感器222相应的位置处，光学元件221可对带有指纹信息的返回光起到调制的作用，使返回光经过调制后进入指纹图像传感器222中，提高指纹识别的精度和检测效果。探测光照射到背后盖板10指纹检测区域的手指上形成返回光，返回光透过光学元件221后进入指纹图像传感器222中以形成指纹图像，指纹图像传感器222将指纹图像转换成电信号，即可用于进行指纹的比对，实现指纹的识别，同时有助于提高指纹检测的精准度，提升指纹识别的效果。
在本实施例中，对光学元件221的具体类型并无其它要求，能够实现其功能即可，该光学元件221可以是透镜、准直孔层以及光阑等。
进一步的，在本实施例中，该背后光学指纹识别系统20还包括滤光层23，滤光层23可以位于光学指纹识别模组22和背后盖板10之间，且与光学指纹识别模组22相对应，具体的，滤光层23可以位于光学元件221与背后盖板10之间，滤光层23用于使探测光以及探测光照射到手指时形成的返回光透过，并滤除进入指纹识别模组中的可见光，探测光照射到指纹检测区域的手指形成返回光，该返回光透过滤光层23后透过光学元件221进入指纹图像传感器222中，同时滤光层23可滤除环境中的可见光，这样在保证实现光学指纹识别的同时，避免了环境中的可见光透过光学元件221进入指纹图像传感器222中，影响光学指纹识别模组22的识别，提高了指纹检测的精准度。
在本实施例中，该滤光层23也可以位于光学元件221和指纹图像传感器222之间，且滤光层23与指纹图像传感器222相对应，探测光照射到指纹检测区域的手指形成返回光，该返回光透过光学元件221后透过滤光层23进入指纹图像传感器222中，同时滤光层23可滤除环境中的可见光，这样在保证实现光学指纹识别的同时，避免了环境中的可见光透过光学元件221进入指纹图像传感器222中，影响光学指纹识别模组22的识别，提高了指纹检测的精准度。
在本实施例中，滤光层23可以采用IC集成的方式集成在光学元件221或指纹图像传感器222上，也可以采用独立设置的方式与光学元件221或指纹图像传感器222贴合。
其中，在本实施例中，如图19所示，该背后光学指纹识别系统还包括可透光的贴合层227，该贴合层227用于将滤光层23与光学元件221贴合，其中，该可透光的贴合层227具体为具有低折射率的透光材料，具有良好的透光性和较低的折射率，这样可保证滤光层23和光学元件221之间良好的固定的同时，也保证了光学元件221的调制效果不受影响。滤光层23的类型可参照实施例一，在本实施例中不再赘述。
进一步的，该背后光学指纹识别系统20还可以包括标识显示模块24以及触摸检测模块25，其中，标识显示模块24和触摸检测模块25均位于背后盖板10与光学指纹识别模组22之间，具体的，触摸检测模块25可位于标识显示模块24与光学指纹识别模组22之间或者位于标识显示模块24与背后盖板10之间。标识显示模块24以及触摸检测模块25的具体设置位置以及所包括的具体部件可参照实施例一，在本实施例中不再赘述。
在本实施例中，背后盖板10的材质包括塑料、玻璃、铝合金或陶瓷中的任一种或多种组合。其中，背后盖板10上与指纹检测区域相应的位置处可以设置通孔11，以使探测光可透过背后盖板10照射在指纹检测区域上，或者，背后盖板10可以由可使探测光透过的材料形成，这样就无需开设通孔11，提高了背后盖板10的美观性。当背后盖板10为由可使探测光透过的材料形成时，可在背后盖板10上与指纹检测区域相应的位置设置盲孔12，以便于用户盲按进行指纹识别，具体的设置方式可参照实施例一，在本实施例中不再赘述。
在本实施例中，指纹检测光源21可以是一个或多个，多个的指纹检测光源21以光学指纹识别模组22为对称中心或对角线中心的方式设置。或者，该指纹检测光源21可以是圆环状，圆环状的指纹检测光源21环绕光学指纹识别模组22设置，具体的设置方式可参照实施例一，在本实施例中不再赘述。
在本实施例中，该背后光学指纹识别系统20还可包括基板26，基板26位于背后盖板10与背光模组之间，且指纹检测光源21、光学指纹识别模组22设置在基板26朝向背后盖板10的一面上。基板26用于为指纹检测光源21以及光学指纹识别模组22提供设置场所，该基板26可以是FPC软板或PCB硬板，在本实施例中不做限制。
本实施例提供的一种背后光学指纹识别系统20，通过光学指纹识别模组 22包括光学元件221和指纹图像传感器222，并使光学元件221位于指纹图像传感器222靠近背后盖板10的一侧，光学元件221可对带有指纹信息的返回光起到调制的作用，使其经过调制后进入指纹图像传感器222中，提高指纹识别的精度和检测效果。具体的，探测光照射到背后盖板10指纹检测区域的手指上形成返回光，返回光透过光学元件221后进入指纹图像传感器222中以形成指纹图像，实现光学指纹的识别，同时有助于提高指纹检测的精准度，提升指纹识别的效果。
实施例三
图11是本发明实施例三提供的一种背后光学指纹识别系统的结构示意图。
进一步的，在上述实施例二的基础上，如图10和图11所示，在本实施例中，光学指纹识别模组22的光学元件221为透镜，透镜凸起的一端朝向指纹图像传感器222设置，透镜具有有较强的聚光能力，返回光经过透镜后成像，使可成像的广度范围较大，形成的指纹图像更加准确。具体的，透镜设置在背后盖板10和指纹图像传感器222之间，且透镜位于与指纹图像传感器222相应的位置处，探测光照射到背后盖板10指纹检测区域的手指上形成返回光，返回光透过透镜后进入指纹图像传感器222中以形成指纹图像，指纹图像传感器222将指纹图像转换成电信号，即可用于进行指纹的比对，实现光学指纹的识别，同时经过透镜的调制后成像，具有较广的成像范围，且形成更加准确的指纹图像，有助于提高指纹检测的精准度。
进一步的，在本实施例中，如图10和图11所示，该背后光学指纹识别系统20还包括滤光层23，滤光层23可以位于透镜和指纹图像传感器222之间，也可以位于透镜和背后盖板10之间，且滤光层23与指纹图像传感器222相对应，探测光照射到指纹检测区域的手指形成返回光，该返回光透过透镜和滤光层23后进入指纹图像传感器222中，同时滤光层23可滤除环境中的可见光，这样在保证实现光学指纹识别的同时，避免了环境中的可见光透过光学元件221进入指纹图像传感器222中，影响光学指纹识别模组22的识别，提高了指纹检测的精准度。
在本实施例中，滤光层23可以采用IC集成的方式集成在指纹图像传感 器222或透镜上，也可以采用独立设置的方式与指纹图像传感器222或透镜贴合。其中，滤光层23与透镜进行贴合时，可通过可透光、低折射率的贴合层227对两者进行贴合，这样保证滤光层23和透镜之间良好的固定的同时，可以保证透镜的聚光效果不受影响。滤光层23的类型可参照实施例一，在本实施例中不再赘述。
进一步的，该背后光学指纹识别系统20还可以包括标识显示模块24以及触摸检测模块25，其中，标识显示模块24和触摸检测模块25均位于背后盖板10与光学指纹识别模组22之间，具体的，触摸检测模块25可以位于标识显示模块24与光学指纹识别模组22之间或者也可位于标识显示模块24与背后盖板10之间。标识显示模块24以及触摸检测模块25的具体设置位置以及所包括的具体部件可参照实施例一，在本实施例中不再赘述。
在本实施例中，背后盖板10的材质包括塑料、玻璃、铝合金或陶瓷中的任一种或多种组合。背后盖板10上与指纹检测区域相应的位置处可以设置通孔11，以使探测光可透过背后盖板10照射在指纹检测区域上，其中，需要说明的是，开设的通孔11的区域大型需大于透镜的视场角范围。或者，背后盖板10可以由可使探测光透过的材料形成，这样就无需开设通孔11，提高了背后盖板10的美观性。当背后盖板10为由可使探测光透过的材料形成时，可在背后盖板10上与指纹检测区域相应的位置设置盲孔12，以便于用户盲按进行指纹识别，具体的设置方式可参照实施例一，在本实施例中不再赘述。
在本实施例中，指纹检测光源21可以是一个或多个，多个的指纹检测光源21以光学指纹识别模组22为对称中心或对角线中心的方式设置。或者，该指纹检测光源21可以是圆环状，圆环状的指纹检测光源21环绕光学指纹识别模组22设置，具体的设置方式可参照实施例一，在本实施例中不再赘述。
在本实施例中，该背后光学指纹识别系统20还可包括基板26，基板26位于背后盖板10与背光模组之间，且指纹检测光源21、光学指纹识别模组22设置在基板26朝向背后盖板10的一面上。基板26用于为指纹检测光源21以及光学指纹识别模组22提供设置场所，该基板26可以是FPC软板或PCB硬板，在本实施例中不做限制。
本实施例提供的一种背后光学指纹识别系统，通过使光学元件221为透镜，利用透镜强的聚光能力，使成像的广度范围变大，形成的指纹图像更加 准确，具体的，具体的，探测光照射到背后盖板10指纹检测区域的手指上形成返回光，返回光透过透镜后进入指纹图像传感器222中以形成指纹图像，实现光学指纹的识别，同时经过透镜的调制后成像，具有较广的成像范围，且形成更加准确的指纹图像，有助于提高指纹检测的精准度。
实施例四
图12是本发明实施例四提供的一种背后光学指纹识别系统的结构示意图，图13是本发明实施例四提供的一种背后光学指纹识别系统中准直孔层的结构示意图，图14是本发明实施例四提供的又一种背后光学指纹识别系统的结构示意图。
进一步的，在实施例二的基础上，如图12和图14所示，在本实施例中，光学元件221为准直孔层，准直孔层上开设多个相互平行的透光孔223，以使返回光经过透光孔223后投射在指纹图像传感器222上，光线经过准直孔层上的透光孔223时，可选择使一种特定角度的光线透过，使其余光线无法参与成像，避免了交杂的光线对指纹成像形成干扰，有效的提高了指纹图像的清晰度，提升指纹识别的精准度。具体的，准直孔层设置在背后盖板10和指纹图像传感器222之间，且准直孔层位于与指纹图像传感器222相应的位置处，探测光照射到背后盖板10指纹检测区域的手指上形成返回光，返回光透过准直孔层上的透光孔223后进入指纹图像传感器222中以形成指纹图像，实现了光学指纹的识别，同时经过准直孔的透过选择，有效的提高了指纹图像的清晰度，提升指纹识别的精准度。
其中，在本实施例中，如图13所示，准直孔层由不透光的光阻材料形成，在其上开设用于透光的透光孔223，即可实现对光线的选择透过。其中，透光孔223的孔径大小和深度可根据需求的准直孔层的准直度进行设置，在本实施例中，透光孔223的孔径和孔深的比值大于5，可保证形成的图像性较好的指纹图像，保证光学指纹识别的实现。
进一步的，在本实施例中，如图12和图14所示，该背后光学指纹识别系统还包括滤光层23，滤光层23可以位于准直孔层和指纹图像传感器222之间，也可以位于准直孔层和背后盖板10之间，且滤光层23与指纹图像传感器222位置相对应，探测光照射到指纹检测区域的手指形成返回光，该返 回光透过准直孔层的透光孔223和滤光层23后进入指纹图像传感器222中，同时滤光层23可滤除环境中的可见光，这样在保证实现光学指纹识别的同时，避免了环境中的可见光透过透光孔223后进入指纹图像传感器222中，影响光学指纹识别模组22的识别，提高了指纹检测的精准度。
在本实施例中，滤光层23可以采用IC集成的方式集成在指纹图像传感器222或准直孔层上，也可以采用独立设置的方式与指纹图像传感器222或准直孔层贴合。其中，滤光层23的类型可参照实施例一，在本实施例中不再赘述。
进一步的，在本实施例中，该背后光学指纹识别系统20还可以包括标识显示模块24以及触摸检测模块25，其中，标识显示模块24和触摸检测模块25均位于背后盖板10与光学指纹识别模组22之间，具体的，触摸检测模块25可以位于标识显示模块24与光学指纹识别模组22之间或者也可位于标识显示模块24与背后盖板10之间。标识显示模块24以及触摸检测模块25的具体设置位置以及所包括的具体部件可参照实施例一，在本实施例中不再赘述。
在本实施例中，背后盖板10的材质包括塑料、玻璃、铝合金或陶瓷中的任一种或多种组合。背后盖板10上与指纹检测区域相应的位置处可以设置通孔11，以使探测光可透过背后盖板10照射在指纹检测区域上。或者，背后盖板10可以由可使探测光透过的材料形成，这样就无需开设通孔11，提高了背后盖板10的美观性。当背后盖板10为由可使探测光透过的材料形成时，可在背后盖板10上与指纹检测区域相应的位置设置盲孔12，以便于用户盲按进行指纹识别，具体的设置方式可参照实施例一，在本实施例中不再赘述。
在本实施例中，指纹检测光源21可以是一个或多个，多个的指纹检测光源21以光学指纹识别模组22为对称中心或对角线中心的方式设置。或者，该指纹检测光源21可以是圆环状，圆环状的指纹检测光源21环绕光学指纹识别模组22设置，具体的设置方式可参照实施例一，在本实施例中不再赘述。
在本实施例中，该背后光学指纹识别系统20还可包括基板26，基板26位于背后盖板10与背光模组之间，且指纹检测光源21、光学指纹识别模组22设置在基板26朝向背后盖板10的一面上。基板26用于为指纹检测光源21以及光学指纹识别模组22提供设置场所，该基板26可以是FPC软板或 PCB硬板，在本实施例中不做限制。
本实施例提供的一种背后光学指纹识别系统，通过使光学元件221为准直孔层，在准直孔层上开设多个透光孔223，这样光线经过准直孔层时，透光孔223可选择性的使平行与透光孔223轴向的光学透过，避免了交杂的光线对指纹成像形成干扰，有效的提高了指纹图像的清晰度，提升指纹识别的精准度，这样返回光透过准直孔层上的透光孔223后进入指纹图像传感器222中以形成指纹图像，实现了光学指纹的识别，同时经过准直孔的透过选择，有效的提高了指纹图像的清晰度，提升指纹识别的精准度。
实施例五
图15是本发明实施例五提供的一种背后光学指纹识别系统的结构示意图，图16是本发明实施例五提供的一种背后光学指纹识别系统中微透镜层的结构示意图，图17是本发明实施例五提供的一种背后光学指纹识别系统的局部放大结构示意图，图18是本发明实施例五提供的又一种背后光学指纹识别系统的局部放大结构示意图，图19是本发明实施例五提供的另一种背后光学指纹识别系统的局部放大结构示意图，图20是本发明实施例五提供的又一种背后光学指纹识别系统的结构示意图。
进一步的，在上述实施例二的基础上，如图15至图20所示，在本实施例中，光学元件221包括：微透镜层224和光阑层225，具体的，微透镜层224与光阑层225之间设置有透光材料层，其中，微透镜层224靠近背后盖板10设置，且微透镜层224凸起的一端朝向背后盖板10，其中微透镜层224具有较强的聚光性，可扩大成像的广度范围，使指纹图像更加的准确。光阑层225包括光阑板，如图16所示，光阑板上开设有多个相互平行的光阑孔226，以使返回光再依次经过微透镜层224和透光材料层后经过光阑孔226照射在指纹图像传感器222上，这样在光学透过光阑板上的光阑孔226时，透光的光阑孔226对光线起到选择透过的作用，提高指纹图像的清晰度，在本实施例中，使光学元件221包括微透镜层224和光阑层225，并使返回光首先微透镜层224后，再经过光阑层225的光阑孔226选择透过后进入指纹图像传感器222中，即使依次返回光经过透镜和光阑层225后成像，扩大成像广度范围的同时，提高了指纹图像的清晰度，进一步的提升了光学指纹识别 的精准度。另外，与光学元件221为透镜或准直孔层相比，使光线元件包括微透镜层224和光阑层225，由于光阑层225的厚度较小，微透镜层224所需的成像距离较小，使形成的光学元件221更加的薄，从而使整个光学指纹识别系统厚度更薄，有助于满足电子设备30日益趋薄化的需求，且返回光经过微透镜和光阑层225后成像，具有更高的准直度，指纹图像也更加的清晰。
在本实施例中，探测光照射到背后盖板10指纹检测区域的手指上形成返回光，返回光首先透过微透镜层224后经过透光材料，然后从光阑层225的光阑孔226透过后进入指纹图像传感器222中以形成指纹图像，实现了光学指纹的识别，且返回光依次经过微透镜层224和光阑层225的调制后成像，扩大成像广度范围的同时，提高了指纹图像的清晰度，有效的提升了指纹识别的精准度。
需要说明的是，在本实施例中，微透镜层224是由多个微透镜并列排布形成的。对透光材料的材料类型并无其它要求，具有透光性不影响光线的传输即可。
在本实施例中，为提高光阑层225的准直度，进一步提升指纹图像的清晰度，如图18所示，光阑层225可包括多层层叠设置的光阑板，使光线在进行多次的选择透过后进入指纹图像传感器222中，有效的提高形成的指纹图像的清晰度。
进一步的，在本实施例中，如图15和图20所示，该背后光学指纹识别系统20还包括滤光层23，滤光层23可以位于光阑层225和指纹图像传感器222之间，也可以位微透镜层224和背后盖板10之间，且滤光层23与指纹图像传感器222位置相对应，探测光照射到指纹检测区域的手指形成返回光，该返回光透过微透镜、光阑层225的光阑孔226和滤光层23后进入指纹图像传感器222中，同时滤光层23可滤除环境中的可见光，这样在保证实现光学指纹识别的同时，避免了环境中的可见光进入指纹图像传感器222中，影响光学指纹识别模组22的识别，提高了指纹检测的精准度。
在本实施例中，滤光层23可以采用IC集成的方式集成在指纹图像传感器222或微透镜层224上，也可以采用独立设置的方式与指纹图像传感器222或微透镜层224贴合。其中，滤光层23与微透镜层224进行贴合时，如图21所示，可通过可透光的、低折射率的贴合层227对两者进行贴合，这样保 证滤光层23和微透镜层224之间良好固定的同时，也保证了微透镜的聚光效果不受影响。滤光层23的类型可参照实施例一，在本实施例中不再赘述。
进一步的，在本实施例中，该背后光学指纹识别系统20还可以包括标识显示模块24以及触摸检测模块25，其中，标识显示模块24和触摸检测模块25均位于背后盖板10与光学指纹识别模组22之间，具体的，触摸检测模块25可以位于标识显示模块24与光学指纹识别模组22之间或者位于标识显示模块24与背后盖板10之间。标识显示模块24以及触摸检测模块25的具体设置位置以及所包括的具体部件可参照实施例一，在本实施例中不再赘述。
在本实施例中，背后盖板10的材质包括塑料、玻璃、铝合金或陶瓷中的任一种或多种组合。背后盖板10上与指纹检测区域相应的位置处可以设置通孔11，以使探测光可透过背后盖板10照射在指纹检测区域上。或者，背后盖板10可以由可使探测光透过的材料形成，这样就无需开设通孔11，提高了背后盖板10的美观性。当背后盖板10为由可使探测光透过的材料形成时，可在背后盖板10上与指纹检测区域相应的位置设置盲孔12，以便于用户盲按进行指纹识别，具体的设置方式可参照实施例一，在本实施例中不再赘述。
在本实施例中，指纹检测光源21可以是一个或多个，多个的指纹检测光源21以光学指纹识别模组22为对称中心或对角线中心的方式设置。或者，该指纹检测光源21可以是圆环状，圆环状的指纹检测光源21环绕光学指纹识别模组22设置，具体的设置方式可参照实施例一，在本实施例中不再赘述。
在本实施例中，该背后光学指纹识别系统20还可包括基板26，基板26位于背后盖板10与背光模组之间，且指纹检测光源21、光学指纹识别模组22设置在基板26朝向背后盖板10的一面上。基板26用于为指纹检测光源21以及光学指纹识别模组22提供设置场所，该基板26可以是FPC软板或PCB硬板，在本实施例中不做限制。
本实施例提供的一种背后光学指纹识别系统，通过使光学元件221包括微透镜层224和光阑层225，微透镜层224与光阑层225之间设置有透光材料层，并使微透镜层224靠近背后盖板10设置，且微透镜层224凸起的一端朝向背后盖板10；使光阑层225包括光阑板，光阑板上开设有多个相互平行的光阑孔226，以使返回光再依次经过微透镜层224和透光材料层后经过光阑孔226照射在指纹图像传感器222上，即使返回光依次经过透镜和光阑层225后成像，扩大成 像广度范围的同时，提高了指纹图像的清晰度，进一步的提升了光学指纹识别的精准度。
实施例六
本实施例提供一种电子装置，该电子装置包括上述任一实施例中的背后光学指纹识别系统，该电子装置具体可以为液晶显示装置、电子纸、手机、平板电脑、电视机、笔记本电脑、数码相框、导航仪、指纹锁等电子产品或部件。
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应作广义理解，例如，可以是固定连接，也可以是通过中间媒介间接相连，可以是两个元件内部的连通或者两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
在本发明的描述中，需要理解的是，术语“上”、“下”、“前”、“后”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或者位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或者暗示所指的装置或者元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。在本发明的描述中，“多个”的含义是两个或两个以上，除非是另有精确具体地规定。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”、“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本申请的实施例例如能够以除了在这里图示或描述的那些以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的 普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (20)

  1. 一种背后光学指纹识别系统，应用于具有显示模组和背后盖板的电子装置，其特征在于，所述背后光学指纹识别系统包括：指纹检测光源和光学指纹识别模组；
    所述指纹检测光源和所述光学指纹识别模组位于所述显示模组和所述背后盖板之间，且所述指纹检测光源用于向位于所述背后盖板上的指纹检测区域发射探测光，所述探测光在照射到所述指纹检测区域的手指时形成返回光，所述光学指纹识别模组用于接收所述返回光并形成指纹图像。
  2. 根据权利要求1所述的背后光学指纹识别系统，其特征在于，所述光学指纹识别模组包括光学元件和指纹图像传感器，所述光学元件位于所述指纹图像传感器靠近所述背后盖板的一侧，且所述光学元件设置在与所述指纹图像传感器相应位置处，所述返回光透过所述光学元件且进入所述指纹图像传感器以形成指纹图像。
  3. 根据权利要求2所述的背后光学指纹识别系统，其特征在于，所述光学元件为透镜，所述透镜凸起的一端朝向所述指纹图像传感器。
  4. 根据权利要求2所述的背后光学指纹识别系统，其特征在于，所述光学元件为准直孔层，所述准直孔层上开设多个相互平行的透光孔，以使所述返回光经过所述透光孔后投射在指纹图像传感器上。
  5. 根据权利要求2所述的背后光学指纹识别系统，其特征在于，所述光学元件包括：微透镜层和光阑层，所述微透镜层与所述光阑层之间设置有透光材料层，所述微透镜层靠近所述背后盖板设置，且所述微透镜层凸起的一端朝向所述背后盖板；
    所述光阑层包括光阑板，所述光阑板上开设有多个相互平行的光阑孔，以使所述返回光再依次经过所述微透镜层和所述透光材料层后经过所述光阑孔照射在所述指纹图像传感器上。
  6. 根据权利要求5所述的背后光学指纹识别系统，其特征在于，所述光阑层包括多层层叠设置的光阑板。
  7. 根据权利要求1-6任一所述的背后光学指纹识别系统，其特征在于，所述指纹检测光源包括可见光指纹检测光源或非可见光指纹检测光源。
  8. 根据权利要求7所述的背后光学指纹识别系统，其特征在于，所述指 纹检测光源为红外指纹检测光源。
  9. 根据权利要求1或2所述的背后光学指纹识别系统，其特征在于，还包括滤光层，所述滤光层位于所述光学指纹识别模组和所述背后盖板之间且与所述光学指纹识别模组相对应；或者，所述滤光层位于所述光学指纹识别模组的光学元件和指纹图像传感器之间且与所述指纹图像传感器相对应。
  10. 根据权利要求9所述的背后光学指纹识别系统，其特征在于，还包括可透光的贴合层，所述贴合层用于将所述滤光层与所述光学元件贴合。
  11. 根据权利要求1-10任一所述的背后光学指纹识别系统，其特征在于，还包括标识显示模块，所述标识显示模块位于所述背后盖板与所述光学指纹识别模组之间，所述标识显示模块包括可见光源和匀光板，所述可见光源并列设置在所述匀光板的一侧。
  12. 根据权利要求11所述的背后光学指纹识别系统，其特征在于，所述标识显示模块还包括：反射膜，所述反射膜设置在所述匀光板和所述可见光源朝向背后盖板一侧的上方，且所述反射膜用于将所述指纹检测光源发出的探测光透过以及用于将所述可见光源发出的可见光反射。
  13. 根据权利要求1-12任一所述的背后光学指纹识别系统，其特征在于，还包括触摸检测模块，所述触摸检测模块位于所述背后盖板与所述光学指纹识别模组之间。
  14. 根据权利要求1-13任一所述的背后光学指纹识别系统，其特征在于，所述背后盖板上与所述指纹检测区域相应的位置处设置通孔，以使所述探测光可穿过所述背后盖板照射在所述指纹检测区域上。
  15. 根据权利要求1-14任一所述的背后光学指纹识别系统，其特征在于，所述背后盖板由可使所述探测光透过的材料形成。
  16. 根据权利要求15所述的背后光学指纹识别系统，其特征在于，所述背后盖板上与所述指纹检测区域相应的位置处设置盲孔。
  17. 根据权利要求1-16任一所述的背后光学指纹识别系统，其特征在于，所述指纹检测光源为一个或多个，多个所述指纹检测光源以光学指纹识别模组为对称中心或对角线中心的方式设置；或者，
    所述指纹检测光源为圆环状，所述指纹检测光源环绕所述光学指纹识别模组设置。
  18. 根据权利要求1-17任一所述的背后光学指纹识别系统，其特征在于，还包括基板，所述基板位于所述背后盖板与所述显示模组之间，且所述指纹检测光源、所述光学指纹识别模组设置在所述基板朝向所述背后盖板的一面上。
  19. 根据权利要求1-18任一所述的背后光学指纹识别系统，其特征在于，所述背后盖板的材质包括塑料、玻璃、铝合金或陶瓷中的任一种或多种组合。
  20. 一种电子装置，其特征在于，包括上述权利要求1-19任一所述的背后光学指纹识别系统。
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