WO2021016849A1 - 一种屏下指纹系统、光学指纹显示模组及电子装置 - Google Patents

一种屏下指纹系统、光学指纹显示模组及电子装置 Download PDF

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Publication number
WO2021016849A1
WO2021016849A1 PCT/CN2019/098345 CN2019098345W WO2021016849A1 WO 2021016849 A1 WO2021016849 A1 WO 2021016849A1 CN 2019098345 W CN2019098345 W CN 2019098345W WO 2021016849 A1 WO2021016849 A1 WO 2021016849A1
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Prior art keywords
module
film layer
fingerprint
diffusion film
diffusion
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PCT/CN2019/098345
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English (en)
French (fr)
Inventor
李顺展
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深圳市汇顶科技股份有限公司
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Priority to PCT/CN2019/098345 priority Critical patent/WO2021016849A1/zh
Priority to CN201980003982.0A priority patent/CN111052136B/zh
Publication of WO2021016849A1 publication Critical patent/WO2021016849A1/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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133504—Diffusing, scattering, diffracting elements

Definitions

  • This application relates to the field of display technology, in particular to an under-screen fingerprint system, an optical fingerprint display module and an electronic device.
  • the full screen As the mainstream element of current smartphones, the full screen, the fingerprint recognition module under the screen combined with the full screen design, brings users the ultimate visual experience and good user experience.
  • an existing under-screen fingerprint system of Liquid Crystal Display requires the fingerprint module 3 to be hidden Within the black frame at the bottom of the mobile phone, and in this system, the backlight module 1 is in the area near the bottom of the mobile phone, that is, the backlight module 1 has a recessed structure at the end close to the fingerprint module 3, and the fingerprint module 3 is located at the bottom of the mobile phone.
  • the fingerprint module 3 is located between the recessed structure of the LCD liquid crystal panel and the backlight module 1.
  • the fingerprint module 3 when the fingerprint module 3 is between the recessed structure of the LCD liquid crystal panel and the backlight module 1, as shown in Figures 1 and 2, the fingerprint module 3 supports a certain amount between the LCD liquid crystal panel and the backlight module 1.
  • the air gap will have a certain impact on the LCD display effect and the user’s visual experience.
  • the user viewing from the top of the mobile phone, the user can see the side wall of the fingerprint module 3 through the LCD liquid crystal panel, and the side wall of the fingerprint module 3 and the original black edge of the mobile phone (ie the non-display area of the mobile phone LCD liquid crystal panel)
  • chromatic aberration which will affect the display effect
  • the user can perceive or feel the existence of the air gap when viewed from different angles, and the air gap area display has a certain sense of space, which in turn affects The user’s visual experience.
  • the invention provides an under-screen fingerprint system, an optical fingerprint display module and an electronic device to solve the problem of the air gap between the existing LCD liquid crystal panel and the backlight module which is propped up by the fingerprint module, which affects the display effect and the user's vision The question of feeling.
  • an embodiment of the present invention provides an under-screen fingerprint system, which is applied to an electronic device having a display module and a backlight module.
  • the under-screen fingerprint system includes a fingerprint module, and the fingerprint module is located in the Between the backlight module and the display module, a first diffusion film layer is provided between the fingerprint module and the display module, and the first diffusion film layer is used to shield the fingerprint module to Make the fingerprint module invisible on the front of the display module.
  • the fingerprint module is located in the recessed structure of the backlight module, so that there is an air gap between the backlight module and the display module, wherein the backlight module
  • the recessed structure is formed in the edge area of the electronic device.
  • the first diffusion film layer covers the recess structure and the fingerprint module, wherein the visible light haze of the first diffusion film layer is not less than 70%, and
  • the first diffusion film layer is used for reforming the received light emitted from the backlight module into a light source plane to illuminate the display module.
  • a fingerprint detection area is provided on the first diffusion film layer, and the fingerprint detection area is the fingerprint module on the first diffusion film layer that receives reflected light generated by fingerprint reflection. When the reflected light passes through the area on the first diffusion film layer.
  • the infrared haze of the fingerprint detection area is not more than 20%.
  • diffusion particles are distributed on the first diffusion film layer.
  • the diffusion particles are uniformly distributed on the first diffusion film layer.
  • the diffusion particles are gradually distributed on the first diffusion film layer toward the fingerprint module.
  • the distribution density of the diffusion particles on the first diffusion film layer gradually increases along the direction toward the outer edge of the fingerprint module.
  • the diffusion particles are fine particles, and the particle size of the fine particles is 0.01um-0.10um.
  • the diffusion particles adopt infrared-transmitting diffusion particles to transmit infrared light with a wavelength of 910 nm to 970 nm.
  • the diffusion particles are distributed on the surface of the first diffusion film layer or in the first diffusion film layer.
  • the backlight module includes a module body, one end of the module body close to the fingerprint module is provided with the recessed structure, and the fingerprint module is located in the recessed structure .
  • the recessed structure is a sunken recessed structure formed on the module body.
  • the module body includes a first horizontal section, an inclined section, and a second horizontal section.
  • the inclined section is located between the first horizontal section and the second horizontal section.
  • the inclined section and the second horizontal section form the sunken recessed structure on the module body.
  • the first diffusion film layer is an orthographic projection area of the inclined section and the second horizontal section on the first diffusion film layer.
  • the diffusion particles when the diffusion particles are gradually distributed on the first diffusion film layer, the diffusion particles are on the first diffusion film layer in the area corresponding to the inclined section.
  • the distribution density is smaller than the distribution density of the diffusion particles in the area corresponding to the second horizontal section on the first diffusion film layer.
  • the side of the first diffusion film layer away from the fingerprint module extends along the horizontal direction of the display module or the backlight module until it is in contact with the display module Or the ends of the backlight module are flush.
  • the extension section of the first diffusion film layer is located between the display module or the backlight module.
  • the uniformity of the display brightness of the backlight module through the first diffusion film layer and the extended section of the first diffusion film layer is greater than 85%.
  • the first diffusion film layer includes a diffusion substrate, and diffusion particles are distributed on the diffusion substrate.
  • the diffusion particles and the diffusion substrate are an integrated structure.
  • an embodiment of the present invention provides an optical fingerprint display module.
  • the optical fingerprint display module includes a backlight module, a display module, and an under-screen fingerprint system as described above.
  • the fingerprint system includes a fingerprint module, the fingerprint module is arranged between the backlight module and the display module, and the fingerprint module is arranged on the recessed structure of the backlight module, the fingerprint module A first diffusion film layer is arranged between the group and the display module.
  • the first diffusion film layer covers the recess structure and the fingerprint module, wherein the visible light haze of the first diffusion film layer is not less than 70%, so The first diffusion film layer is used to re-form a light source plane after receiving the emitted light of the backlight module to illuminate the display module.
  • the backlight module includes a module body, one end of the module body close to the fingerprint module is provided with the recessed structure, and the fingerprint module is located in the recessed structure Inside.
  • the module body includes a light guide plate and a non-light guide plate structure
  • the non-light guide plate structure includes a prism film layer, a second diffusion film layer, a reflective film layer, and a steel plate.
  • the diffusion film layer and the prism film layer are sequentially stacked on the side of the light guide plate close to the first diffusion film, and the reflective film layer and the steel plate are sequentially stacked on the light guide plate with the first diffusion film.
  • the opposite side of the membrane is sequentially stacked on the side of the light guide plate close to the first diffusion film.
  • the fingerprint module is located between the prism film layer and the first diffusion film layer.
  • an embodiment of the present invention provides an electronic device that includes any of the optical fingerprint display modules described above.
  • the present invention provides an under-screen fingerprint system, an optical fingerprint display module and an electronic device.
  • the under-screen fingerprint system includes a fingerprint module, and the fingerprint module is arranged between the backlight module and the display module , A first diffusion film layer is provided between the fingerprint module and the display module, and the first diffusion film layer is used to shield the fingerprint module so that the fingerprint module is in the display module The front side of the fingerprint module is not visible; the first diffusion film layer is arranged between the fingerprint module and the display module, so that the fingerprint module is located under the first diffusion film layer, and the sidewall profile of the fingerprint module is blocked by the first diffusion film layer , Under the action of the first diffusion film layer, the received light emitted from the backlight module is reformed into a light source plane to illuminate the display module, thereby eliminating the sidewalls of the fingerprint module and the non-display area of the display module
  • the chromatic aberration eliminates the sense of space caused by the space gap, making it difficult for the user to detect or feel the existence of the air gap, that is, making
  • the under-screen fingerprint system, optical fingerprint display module and electronic device provided by the present invention solve the problem of the air gap between the existing LCD liquid crystal panel and the backlight module being propped up by the fingerprint module, which affects the display effect and the user's vision The question of feeling.
  • FIG. 1 is a schematic diagram of the structure of an existing fingerprint system under a liquid crystal display
  • FIG. 2 is a schematic diagram of the structure of an existing electronic device equipped with a fingerprint system under a liquid crystal display
  • FIG. 3 is an external display diagram of a conventional display module.
  • Embodiment 4 is a schematic structural diagram of an under-screen fingerprint system according to Embodiment 1 of the present invention.
  • FIG. 5 is a schematic diagram of the structure of the first diffusion film layer provided by the second embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of another first diffusion film layer provided by the second embodiment of the present invention.
  • FIG. 7 is a schematic diagram of the structure of the first diffusion film layer provided by the third embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of another first diffusion film layer provided by Embodiment 3 of the present invention.
  • Embodiment 6 of the present invention is a schematic structural diagram of an optical fingerprint display module provided by Embodiment 6 of the present invention.
  • FIG. 10 is a schematic structural diagram of another optical fingerprint display module provided by Embodiment 6 of the present invention.
  • the fingerprint module 3 is located in the recessed structure of the backlight module 1 at the bottom of the mobile phone.
  • the fingerprint module 3 is between the recessed structure of the LCD liquid crystal panel and the backlight module 1, the LCD liquid crystal panel and the backlight module
  • the fingerprint module 3 There is a certain air gap between 1 and the fingerprint module 3, which will have a certain impact on the LCD display effect and the user’s visual experience.
  • the user when viewed from the top of the mobile phone, the user can see through The side wall of the fingerprint module 3 can be seen through the LCD liquid crystal panel, and there will be a color difference between the side wall of the fingerprint module 3 and the original black border of the mobile phone (that is, the non-display area of the mobile phone LCD liquid crystal panel), which will affect the display effect.
  • the existence of the aforementioned air gap will cause the user to perceive or feel the existence of the air gap when viewed from different angles, and the air gap area shows a certain sense of space, which in turn affects the user's visual experience.
  • the present invention provides an under-screen fingerprint system and optical fingerprint Display module 2 and electronic device.
  • FIG. 4 is a schematic structural diagram of an under-screen fingerprint system according to Embodiment 1 of the present invention.
  • an embodiment of the present invention provides an under-screen fingerprint system, which is applied to an electronic device having a display module 2 and a backlight module 1.
  • the under-screen fingerprint system includes a fingerprint module 3, and the fingerprint module 3 is designed
  • a first diffusion film layer 4 is provided between the backlight module 1 and the display module 2, and between the fingerprint module 3 and the display module 2.
  • the first diffusion film layer 4 is used to shield the fingerprint module 3 so that the fingerprint module Group 3 is not visible on the front of display module 2.
  • the fingerprint module 3 is located in the recessed structure of the backlight module 1, so that there is an air gap between the backlight module 1 and the display module 2.
  • the recessed structure is formed in the edge area of the electronic device.
  • the fingerprint module 3 is located below the first diffusion film layer 4, and the fingerprint module 3 is blocked by the first diffusion film layer 4.
  • the shape of the side wall makes the fingerprint module 3 difficult to be noticed by the user from the surface of the display module 2, that is, makes the fingerprint module 3 invisible on the front of the display module 2; and through the first diffusion film layer 4
  • the incident light passes through the first diffusion film layer 4
  • many phenomena of refraction, reflection and scattering of the incident light occur.
  • the incident light can be corrected through the first diffusion film layer 4 to form a uniform surface light source, that is, to form a light source again.
  • the light is diffused softly and evenly to illuminate the display module 2, thereby eliminating the interference between the sidewalls of the fingerprint module 3 and the LCD liquid crystal panel compared with the prior art.
  • the chromatic aberration in the display area improves the display effect.
  • the first diffusion film layer 4 shields the side wall of the fingerprint module 3 and the first diffusion film layer 4 can diffuse light softly and evenly to illuminate the display module 2. Compared with the fingerprint system under the LCD screen in the prior art, it can eliminate the sense of space existing in the air gap area, thereby improving the user's visual experience.
  • the first diffusion film layer 4 covers the concave structure and the fingerprint module 3, wherein the visible light haze of the first diffusion film layer 4 is not less than 70%, so that the first diffusion film layer 4 The imaging degree of visible light is poor, and the first diffusion film layer 4 is used to reform the received light emitted from the backlight module 1 into a light source plane and illuminate the display module 2 to eliminate the air gap mentioned in the background art The resulting display effect is poor.
  • the first diffusion film layer 4 can be a diffusion film coated or filled with diffusion particles 401, and the first diffusion film layer 4 can also be a ground glass structure or a surface with uneven surface that can scatter incident light.
  • the first diffusion film layer 4 includes but is not limited to a diffusion film coated or filled with diffusion particles 401.
  • the first diffusion film layer 4 covers the recessed structure and the fingerprint module, wherein the visible light haze of the first diffusion film layer is not less than 70%, and the received backlight module 1 The outgoing light of the light source re-forms the light source plane to illuminate the display module 2.
  • the visible light haze of the first diffusion film layer 4 is not less than 70%, the imaging difficulty when the visible light penetrates the first diffusion film layer 4 is increased, so that the visible light
  • the imaging degree on the first diffusion film layer 4 is low, making it difficult for the user to observe the fingerprint module 3 through the surface of the display module 2 to eliminate the sidewalls of the fingerprint module 3 and the non-display area of the display module 2
  • the chromatic aberration that exists between them improves the display effect and the user's visual experience.
  • the cross-sectional area of the first diffusion film layer 4 is not smaller than the recessed structure of the backlight module 1.
  • the profile of the sidewall of the fingerprint module 3 can be better shielded. Further, due to the first diffusion The visible light on the film layer 4 is diffused after passing through, resulting in a lower imaging degree. Therefore, through the arrangement of the first diffuser film layer 4, it is difficult for the user to detect the fingerprint module 3 from the surface of the display module 2, and Since the first diffusion film layer 4 can reform the received light emitted from the backlight module 1 into the light source plane, that is, the first diffusion film layer 4 can scatter incident light to produce a uniform light effect and illuminate the display module 2. Therefore, the first diffusion film layer 4 can eliminate the color difference between the sidewall of the fingerprint module 3 and the non-display area of the display module 2, thereby improving the display effect and the user's visual experience.
  • a fingerprint is provided on the first diffusion film layer 4.
  • the detection area 403, the fingerprint detection area 403 is the area on the first diffusion film layer 4 when the fingerprint module 3 on the first diffusion film layer 4 receives the reflected light generated by the reflection of the fingerprint, the reflected light passes through the area on the first diffusion film layer 4, and the infrared light fog in the fingerprint detection area 403
  • the degree is not more than 20%, that is, to ensure that the infrared light of the fingerprint detection area 403 on the first diffusion film layer 4 can be transmitted, and to a certain extent, when the visible light penetrates, the light angle changes and the imaging degree decreases.
  • the haze refers to the percentage of the transmitted light intensity that deviates from the incident light by an angle of more than 2.5° to the total transmitted light intensity.
  • the greater the haze the lower the gloss and transparency of the film, especially the imaging degree. Therefore, the visible light imaging degree of the fingerprint detection area 403 on the first diffusion film layer 4 is low, making it more difficult for the user to observe the fingerprint module 3 through the surface of the display module 2 to eliminate the sidewalls and display of the fingerprint module 3
  • the color difference between the non-display areas of the module 2 improves the display effect and the user's visual experience. As shown in FIG. 3, it is a display module 2 that eliminates the color difference and the sense of gap space compared with the existing LCD liquid crystal panel. The appearance of the display diagram.
  • the embodiment of the present invention provides an under-screen fingerprint system including a fingerprint module 3.
  • the fingerprint module 3 is arranged in the recessed structure of the backlight module 1, and the fingerprint module 3 is located on the side of the backlight module 1 facing the display module 2.
  • a first diffusion film layer 4 is provided between the fingerprint module 3 and the display module 2.
  • the fingerprint module 3 By providing the first diffusion film layer 4 between the fingerprint module 3 and the display module 2, the fingerprint module 3 is located at the first Below the diffusion film layer 4, the sidewall profile of the fingerprint module 3 is blocked by the first diffusion film layer 4, and under the action of the first diffusion film layer 4, the received light from the backlight module 1 is reformed into a light source plane , Illuminate the display module 2, thereby eliminating the color difference between the side wall of the fingerprint module 3 and the non-display area of the display module 2, and at the same time eliminate the sense of space caused by the space gap, so that the user is not easy to detect or feel the air gap The existence of, and then enhance the user's visual experience.
  • the under-screen fingerprint system, optical fingerprint display module 2 and electronic device provided by the present invention solve the problem of the air gap between the existing LCD liquid crystal panel and the backlight module 1 supported by the fingerprint module 3, which affects the display effect and The problem of the user's visual perception.
  • FIG. 5 is a schematic structural diagram of the first diffusion film layer provided in the second embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of another first diffusion film layer provided in the second embodiment of the present invention.
  • diffusion particles 401 are distributed on the first diffusion film layer 4.
  • the diffusion particles 401 by distributing the diffusion particles 401 on the first diffusion film layer 4, under the action of the diffusion particles 401, when light passes through the first diffusion film layer 4, the diffusion particles 401 will change the propagation direction of the light or Path, such as: causing light to undergo a lot of refraction, reflection, and scattering, which creates an optical diffusion effect to increase the visible light haze of the first diffusion film layer 4, reduce the imaging degree of visible light, and make it more difficult for users to pass
  • the fingerprint module 3 is observed on the surface of the display module 2 to eliminate the color difference between the sidewall of the fingerprint module 3 and the non-display area of the display module 2, thereby improving the display effect and the user's visual experience.
  • the diffusion particles 401 are gradually distributed on the first diffusion film layer 4 toward the fingerprint module 3, and the diffusion particles 401 are gradually distributed in the first diffusion film layer 4 toward the fingerprint module 3.
  • the distribution density on the film layer 4 gradually increases along the direction toward the outer edge of the fingerprint module 3, that is to say, the distribution density of the diffusion particles 401 on the first diffusion film layer 4 close to the outer edge of the fingerprint module 3
  • the diffusion particles 401 are fine particles, and the particle size of the fine particles is 0.01um-0.10um.
  • the film layer 4 is provided with diffusing particles 401 of different sizes to ensure that the light will not be directly emitted from the first diffusing film layer 4, thereby achieving the effect of atomization, making it more difficult for users to observe through the surface of the display module 2
  • the fingerprint module 3 eliminates the color difference between the side wall of the fingerprint module 3 and the non-display area of the display module 2, thereby improving the display effect and the user's visual experience.
  • the diffusing particles 401 adopt infrared-transmitting diffusing particles 401 to transmit infrared light with a wavelength of 910nm-970nm while increasing the visible light haze and reducing the imaging ability of visible light.
  • the fingerprint The haze of infrared light in the detection area 403 is not more than 20%.
  • the diffusion particles 401 use infrared-transmitting chemical particles, that is, the diffusion particles 401 are particulate materials prepared from materials with high infrared transmittance.
  • the infrared transmittance in the prior art is Higher materials include single crystal polycrystals, glass, ceramics, plastics, diamonds and diamond-like carbon and other varieties.
  • Single crystals mainly include germanium and silicon semiconductors as infrared light materials.
  • the other type of single crystals are ionic crystals, which are alkali or alkaline earth metals.
  • Halides and the infrared light-transmitting materials are all in the prior art. In practice, which infrared-transmitting material in the prior art is specifically selected can be considered according to the technology used and the corresponding production cost. In this embodiment There is no further limitation on the material with higher infrared transmittance used by the diffusion particles 401.
  • the diffusion particles 401 can be spherical, and the diffusion particles 401 can also be particles of other shapes. In this embodiment, it is only necessary to ensure that under the action of the diffusion particles 401, light passes through these diffusion particles. At 401, it is focused to a certain exit angle to achieve the function of enhancing the brightness of the exiting light, ensuring that the light will not go out directly from the diffusion film, and it can achieve a certain atomization effect.
  • the diffusion particles 401 are distributed on the surface of the first diffusion film layer 4 or in the first diffusion film layer 4, that is, in this embodiment, the diffusion particles 401 may be distributed on the surface of the first diffusion film layer 4. It can also be distributed in the first diffusion film layer 4. In this embodiment, no matter how the diffusion particles 401 are distributed on the first diffusion film layer 4, it is only necessary to ensure that the first diffusion film layer 4 with the diffusion particles 401 can function. To a certain degree of homogenization and atomization effect.
  • this embodiment provides another first diffusion film layer 4 structure.
  • the difference between the other first diffusion film layer 4 structure and the above-mentioned first diffusion film layer 4 structure is that, as shown in FIG.
  • the density of the diffusion particles 401 in the fingerprint detection area 403 on the diffusion film layer 4 is less than the distribution density of the periphery of the fingerprint detection area 403 on the first diffusion film layer 4.
  • This embodiment reduces the fingerprint detection area 403 on the first diffusion film layer 4
  • the distribution density of the internal diffusion particles 401 is such that the infrared haze of the fingerprint detection area 403 is not greater than 20%.
  • the difference between this embodiment and the second embodiment is that, as shown in FIGS. 7 and 8, the diffusion particles 401 are uniformly distributed on the first diffusion film layer 4, and the diffusion particles 401 are uniformly distributed on the first diffusion film layer 4.
  • the particles 401 make the visible light haze on the first diffusion film layer 4 not less than 70%, and the infrared light haze of the fingerprint detection area 403 on the first diffusion film layer 4 is not more than 20%.
  • the visible light haze on the first diffusion film layer 4 can be made not less than 70%.
  • the visible light haze of the fingerprint detection area 403 on the first diffusion film layer 4 is not greater than 20%.
  • the present embodiment can uniformly adjust the distribution density of the diffusion particles 401 on the first diffusion film layer 4, so that the infrared light haze of the fingerprint detection area 403 on the first diffusion film layer 4 is not greater than 20%; or as shown in Figure 8, this embodiment can also ensure that the visible light haze on the first diffusion film layer 4 is not less than 70%, by reducing the distribution density of the diffusion particles 401 in the fingerprint detection area 403, Therefore, the infrared haze of the fingerprint detection area 403 is not greater than 20%.
  • the backlight module 1 includes a module body 101.
  • One end of the module body 101 close to the fingerprint module 3 is provided with a recessed structure 102.
  • the module 3 is located in the recessed structure 102.
  • the fingerprint module 3 is located in the recessed structure 102 and between the display module 2 and the backlight module 1, and a certain amount of air is supported by the fingerprint module 3 between the display module 2 and the backlight module 1.
  • the air gap can be an air gap with a vertical distance of less than 1.5mm. Due to the existence of the air gap, it will have a certain impact on the display effect and the user’s visual experience. As described in the above embodiment, the air gap is located in the fingerprint module
  • the first diffusion film layer 4 between 3 and the display module 2 can effectively eliminate the influence of the air gap on the display effect and the user's visual experience, thereby improving the display effect and the user's visual experience. In this embodiment, I will not further elaborate on it.
  • the recessed structure 102 is a sunken recessed structure 102 formed on the module body 101.
  • the sunken recessed structure 102 formed may be different depending on the different forming methods.
  • the sunken recessed structure 102 can be formed by inclining at a certain angle to form the sunken recessed structure 102, or can be connected to the module body 101 by a downwardly recessed arc to form the sunken recessed structure 102.
  • the formation method and structure of the sunken recessed structure 102 are not further limited. Only when the fingerprint module 3 is placed in the recessed structure 102, there is a certain gap between the backlight module 1 and the display module 2. The air gap is sufficient.
  • the module body 101 includes a first horizontal section 103, an inclined section 104, and a second horizontal section 105.
  • the inclined section 104 is located between the first horizontal section 103 and the second horizontal section 105.
  • the higher end is connected with the first horizontal section 103
  • the lower end of the inclined section 104 is connected with the second horizontal section 105
  • the inclined section 104 and the second horizontal section 105 form a sunken recessed structure 102 on the module body 101
  • the fingerprint module 3 is located on the second horizontal section 105.
  • the first horizontal section 103, the inclined section 104, and the second horizontal section 105 are an integrated structure, and the inclination angle of the inclined section 104 can be based on the height of the fingerprint module 3 or other design standards in practical applications. Setting is performed, that is, in this embodiment, the inclination angle of the inclined section 104 is not further limited.
  • the first diffusion film layer 4 is the orthographic projection area of the inclined section 104 and the second horizontal section 105 on the first diffusion film layer 4, that is, the first diffusion film layer 4 is arranged on the inclined section 104 and the second Right above the two horizontal segments 105 are used to shield the recessed structure on the backlight module 1.
  • the distribution density of the diffusion particles 401 on the first diffusion film layer 4 corresponding to the inclined section 104 is smaller than that of the diffusion particles 401 on the first diffusion film layer 4 corresponding to the second horizontal section 105 Distribution density.
  • the side of the first diffusion film layer 4 away from the fingerprint module 3 extends along the horizontal direction of the display module 2 or the backlight module 1. Until it is flush with the end of the display module 2 or the backlight module 1, the extension 5 of the first diffusion film layer 4 is located between the display module 2 or the backlight module 1.
  • the extension 5 of the first diffusion film layer 4 can be attached to the side of the display module 2 close to the backlight module 1, and the extension 5 of the first diffusion film layer 4 can also be attached to the backlight.
  • the module 1 is attached to the side close to the display module 2.
  • the first diffusion film layer 4 can be attached to the side of the fingerprint module 3 close to the display module 2, and the first diffusion film layer 4 can also be attached to the display module 2 is attached to the side close to the fingerprint module 3.
  • the first diffusion film layer 4 and the extension section 5 of the first diffusion film layer 4 are an integrated structure, and the extension section 5 is not arranged or less
  • the diffusion particles 401 are arranged to reduce the influence of the diffusion film layer on the display brightness of the display module 2.
  • the consistency of the display brightness of the backlight module 1 after passing through the first diffusion film layer 4 and the extension section 5 of the first diffusion film layer 4 is greater than 85%.
  • the diffusion particles 401 are gradually distributed on the first diffusion film layer 4, by adjusting the distribution density of the diffusion particles 401, the first diffusion film layer 4 and the first diffusion film The consistency of the display brightness of the extension section 5 of the film layer 4 is greater than 85%, which improves the display effect.
  • the first diffusion film layer 4 includes a diffusion substrate 402, and diffusion particles 401 are distributed on the diffusion substrate 402.
  • the diffusion substrate 402 is a transparent diffusion substrate 402, and the diffusion substrate 402 includes but It is not limited to polyethylene terephthalate (PET) substrates.
  • the diffusion particles 401 and the diffusion substrate 402 are an integrated structure, and the diffusion particles 401 may be deposited on the surface of the diffusion substrate 402 or distributed in the diffusion base using other processes.
  • FIG. 9 is a schematic structural diagram of an optical fingerprint display module provided in the fifth embodiment of the present invention
  • FIG. 10 is a schematic structural diagram of another optical fingerprint display module provided in the fifth embodiment of the present invention.
  • this embodiment provides an optical fingerprint display module 2.
  • the optical fingerprint display module 2 includes a backlight module 1 and a display module 2.
  • the under-screen fingerprint system as in any of the above embodiments, the under-screen fingerprint system includes a fingerprint module 3, which is arranged between the backlight module 1 and the display module 2, and the fingerprint module 3 is arranged on the backlight In the recessed structure of the module 1, a first diffusion film layer 4 is provided between the fingerprint module 3 and the display module 2.
  • the fingerprint module 3 is located on the first diffusion film layer 4 through the arrangement of the first diffusion film layer 4 in the optical fingerprint display module 2.
  • the sidewall profile of the fingerprint module 3 is blocked by the first diffusion film layer 4, so that the fingerprint module 3 is not easily perceivable by the user from the surface of the display module 2, and through the arrangement of the first diffusion film layer 4, the incident light from
  • a uniform surface light source is formed, that is, a light source plane is re-formed to achieve the effect of optical diffusion, and the light is diffused softly and uniformly to illuminate the display module 2, thereby comparing
  • the color difference between the side wall of the fingerprint module 3 and the non-display area of the LCD panel is eliminated, the display effect is improved, and the side wall of the fingerprint module 3 is blocked by the first diffusion film layer 4 and the first
  • the diffusion film layer 4 can diffuse light softly and evenly to illuminate the display module 2, and compared with the prior art LCD fingerprint system,
  • the first diffusion film layer 4 covers the recess structure and the fingerprint module, wherein the visible light haze of the first diffusion film layer 4 is not less than 70%, and the first diffusion film layer 4 is used to After receiving the light emitted from the backlight module 1, a light source plane is re-formed to illuminate the display module 2.
  • the infrared light haze of the fingerprint detection area 403 of the first diffusion film layer 4 is not greater than 20%, that is, the infrared light point transmittance of the fingerprint detection area 403 with a wavelength of 910nm-970nm is greater than 80%, In this way, the shape of the side wall of the fingerprint module 3 can be blocked with a visual effect, and the sense of display space is eliminated.
  • the backlight module 1 includes a module body 101, an end of the module body 101 close to the fingerprint module 3 is provided with a recessed structure 102, and the fingerprint module 3 is located in the recessed structure 102.
  • the recessed structure 102 in this embodiment has been described in the third embodiment, and the structure will not be further described in this embodiment.
  • the module body 101 includes a light guide plate 108 and a non-light guide plate 108 structure.
  • the non-light guide plate 108 structure includes a prism film layer 106, a second diffusion film layer 107, a reflective film 109 layer, and a steel plate 110.
  • the diffusion film layer 107 and the prism film layer 106 are sequentially stacked on the side of the light guide plate 108 close to the first diffusion film, and the reflective film 109 layer and the steel plate 110 are sequentially stacked on the light guide plate 108 on the side opposite to the first diffusion film.
  • the fingerprint module 3 is located between the prism film layer 106 and the first diffusion film layer 4.
  • the arrangement of the first diffusion film layer 4 and/or the extension section 5 can not only solve the problem that the existing LCD liquid crystal panel and the backlight module 1 are supported by the fingerprint module 3 to a certain extent.
  • the first diffusion film layer 4 and/or the extension section 5 is located on the uppermost side of the backlight module 1, that is, above the prism film layer 106, it can be more
  • the softness of the light source has the function of diffusing and protecting the prism film 106.
  • the module body 101 is in the prior art, and in this embodiment, no further explanation is given to the film layer of its composition.
  • the display module includes at least a display cover 201 and a display panel 202.
  • the display cover 201 is located on the display panel 202, that is, the display cover 201 is located on the side of the display panel 202 away from the backlight module, and
  • the display cover 201 is attached to the side of the display panel 202 away from the backlight module, and the first diffusion film layer and the extension of the first diffusion film layer are located under the display panel 202 and attached to the display panel 202.
  • the display cover 201 includes but is not limited to a glass cover, and the display panel 202 includes but is not limited to a liquid crystal panel.
  • the display module is a prior art, and will not be further described in this embodiment.
  • the embodiment of the present invention provides an electronic device.
  • the electronic device includes the optical fingerprint display module 2 in the above-mentioned embodiment 5.
  • the electronic device may specifically be a liquid crystal display device or an electronic device.
  • Electronic products or components such as paper, mobile phones, tablet computers, televisions, laptops, digital photo frames, navigators, fingerprint locks, etc.
  • 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

一种屏下指纹系统、光学指纹显示模组及电子装置，屏下指纹系统包括指纹模组（3），指纹模组（3）设在背光模组（1）和显示模组（2）之间，指纹模组（3）和显示模组（2）之间设有第一扩散膜层（4），通过第一扩散膜层（4）挡住指纹模组（3）以使得指纹模组（3）在显示模组（2）的正面不可见，在第一扩散膜层（4）的作用下，将接收到的背光模组（1）的出射光重新形成光源平面，照亮显示模组（2），以提高显示效果以及用户的视觉感受。

Description

一种屏下指纹系统、光学指纹显示模组及电子装置 技术领域
本申请涉及显示技术领域，尤其涉及一种屏下指纹系统、光学指纹显示模组及电子装置。
背景技术
全面屏作为当下智能手机的主流元素，屏下指纹识别模组搭配全面屏设计，给用户带来了极致的视觉感受和良好的使用体验。
目前，为了实现智能手机全面屏的设计，如图1和图2所示，现有的一种液晶显示(Liquid Crystal Display，简称LCD)屏下指纹系统，该系统需要将指纹模组3隐藏在手机底部黑色边框以内，且该系统中，背光模组1在靠近手机底部的区域，即背光模组1在靠近指纹模组3的一端有一凹陷结构，指纹模组3位于手机底部背光模组1的凹陷结构内，且指纹模组3处于LCD液晶面板和背光模组1的凹陷结构之间。
然而，当指纹模组3处于LCD液晶面板和背光模组1的凹陷结构之间时，如图1和图2所示，LCD液晶面板和背光模组1之间被指纹模组3撑起一定的空气间隙，由此将会对LCD显示效果以及用户的视觉感受造成一定的影响。例如：从手机顶部方向观察，用户可以透过LCD液晶面板看到指纹模组3的侧壁，且指纹模组3的侧壁与手机原有黑边(即手机LCD液晶面板的非显示区域)会存在色差，进而影响显示效果，而且由于上述空气间隙的存在，将导致从不同角度观察时，用户都能够察觉或感受到空气间隙的存在，且空气间隙区域显示存在一定的空间感，进而影响用户的视觉感受。
发明内容
本发明提供一种屏下指纹系统、光学指纹显示模组及电子装置，以解决现有LCD液晶面板和背光模组之间被指纹模组撑起一定的空气间隙，影响显示效果以及用户的视觉感受的问题。
第一方面，本发明实施例提供了一种屏下指纹系统，应用于具有显示模组和背光模组的电子装置，所述屏下指纹系统包括指纹模组，所述指纹模组设在所述背光模组和所述显示模组之间，所述指纹模组和所述显示模组之间设有第一扩散膜层，所述第一扩散膜层用于遮挡所述指纹模组以使得所述指纹模组在所述显示模组的正面不可见。
在本发明的具体实施方式中，所述指纹模组位于所述背光模组的凹陷结构内，以使所述背光模组与所述显示模组之间存在空气间隙，其中所述背光模组的凹陷结构形成在所述电子装置的边缘区域。
在本发明的具体实施方式中，所述第一扩散膜层覆盖在所述凹陷结构和所述指纹模组之上，其中，所述第一扩散膜层的可见光雾度不小于70％，且所述第一扩散膜层用于将接收到的所述背光模组的出射光重新形成光源平面，以照亮所述显示模组。
在本发明的具体实施方式中，所述第一扩散膜层上设有指纹探测区域，所述指纹探测区域为所述第一扩散膜层上所述指纹模组接收经指纹反射产生的反射光时，所述反射光通过所述第一扩散膜层上的区域。
在本发明的具体实施方式中，所述指纹探测区域的红外光雾度不大于20％。
在本发明的具体实施方式中，所述第一扩散膜层上分布有扩散粒子。
在本发明的具体实施方式中，所述扩散粒子在所述第一扩散膜层上均匀分布。
在本发明的具体实施方式中，所述扩散粒子在所述第一扩散膜层上朝着所述指纹模组的方向上呈渐进式分布。
在本发明的具体实施方式中，所述扩散粒子在所述第一扩散膜层上的分布密度沿着朝向所述指纹模组的外侧边缘的方向上逐步递增。
在本发明的具体实施方式中，所述扩散粒子为微细颗粒，所述微细颗粒的粒径为0.01um-0.10um。
在本发明的具体实施方式中，所述扩散粒子采用透红外的扩散粒子，以使波长为910nm-970nm的红外光透过。
在本发明的具体实施方式中，所述扩散粒子分布在所述第一扩散膜层的表面或所述第一扩散膜层内。
在本发明的具体实施方式中，所述背光模组包括模组本体，所述模组本体靠近所述指纹模组的一端设有所述凹陷结构，所述指纹模组位于所述凹陷结构内。
在本发明的具体实施方式中，所述凹陷结构为所述模组本体上形成的下沉式凹陷结构。
在本发明的具体实施方式中，所述模组本体包括第一水平段、倾斜段和第二水平段，所述倾斜段位于所述第一水平段和所述第二水平段之间，所述倾斜段和所述第二水平段在所述模组本体上形成所述的下沉式凹陷结构。
在本发明的具体实施方式中，所述第一扩散膜层为所述倾斜段和所述第二水平段在所述第一扩散膜层上的正投影区域。
在本发明的具体实施方式中，所述扩散粒子在所述第一扩散膜层上渐进式分布时，所述扩散粒子在所述第一扩散膜层上与所述倾斜段相对应的区域的分布密度小于所述扩散粒子在所述第一扩散膜层上与所述第二水平段相对应的区域的分布密度。
在本发明的具体实施方式中，所述第一扩散膜层远离所述指纹模组的一侧沿着所述显示模组或所述背光模组的水平方向延伸，直至与所述显示模组或所述背光模组的端部平齐。
在本发明的具体实施方式中，所述第一扩散膜层的延伸段位于所述显示模组或所述背光模组之间。
在本发明的具体实施方式中，所述背光模组透过所述第一扩散膜层和第一扩散膜层的延伸段的显示亮度的一致性大于85％。
在本发明的具体实施方式中，所述第一扩散膜层包括扩散基板，扩散粒子分布在所述扩散基板上。
在本发明的具体实施方式中，所述扩散粒子和所述扩散基板为一体化结构。
第二方面，本发明实施例提供了一种光学指纹显示模组，所述光学指纹显示模组包括背光模组、显示模组、以及如上任一所述的屏下指纹系统，所述屏下指纹系统包括指纹模组，所述指纹模组设在所述背光模组和所述显示模组之间，且所述指纹模组设在所述背光模组的凹陷结构上，所述指 纹模组和所述显示模组之间设有第一扩散膜层。
在本发明的具体实施方式中，所述第一扩散膜层覆盖在所述凹陷结构和所述指纹模组之上，其中，所述第一扩散膜层的可见光雾度不小于70％，所述第一扩散膜层用于将接收到所述背光模组的出射光后重新形成光源平面，以照亮所述显示模组。
在本发明的具体实施方式中，所述背光模组包括模组本体，所述模组本体靠近所述指纹模组的一端上设有所述凹陷结构，所述指纹模组位于所述凹陷结构内。
在本发明的具体实施方式中，所述模组本体包括导光板和非导光板结构，所述非导光板结构包括棱镜膜层、第二扩散膜层、反射膜层和钢板，所述第二扩散膜层和所述棱镜膜层依次堆叠在所述导光板靠近所述第一扩散膜的一侧，所述反射膜层和所述钢板依次堆叠在所述导光板上与所述第一扩散膜相反的一侧。
在本发明的具体实施方式中，所述指纹模组位于所述棱镜膜层和所述第一扩散膜层之间。
第三方面，本发明实施例提供了一种电子装置，所述电子装置包括上任一所述的光学指纹显示模组。
本发明提供一种屏下指纹系统、光学指纹显示模组及电子装置，所述屏下指纹系统包括指纹模组，所述指纹模组设在所述背光模组和所述显示模组之间，所述指纹模组和所述显示模组之间设有第一扩散膜层，所述第一扩散膜层用于遮挡所述指纹模组以使得所述指纹模组在所述显示模组的正面不可见；通过在指纹模组和显示模组之间设置第一扩散膜层，使指纹模组位于第一扩散膜层之下，通过第一扩散膜层挡住指纹模组的侧壁外形，在第一扩散膜层的作用下，将接收到的背光模组的出射光重新形成光源平面，照亮显示模组，从而消除指纹模组的侧壁与显示模组的非显示区存在的色差，与此同时消除空间间隙导致的空间感，使用户不易察觉或感受到空气间隙的存在，即使得所述指纹模组在所述显示模组的正面不可见，进而提升用户的视觉感受。本发明提供的一种屏下指纹系统、光学指纹显示模组及电子装置解决了现有LCD液晶面板和背光模组之间被指纹模组撑起一定的空气间隙，影响显示效果以及用户的视觉感受的问题。
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为现有的一种液晶显示屏下指纹系统的结构示意图；
图2为现有的一种设有液晶显示屏下指纹系统的电子装置的结构示意图；
图3为现有的显示模组的外观显示图。
图4是本发明实施例一提供的一种屏下指纹系统的结构示意图；
图5是本发明实施例二提供的第一扩散膜层的结构示意图；
图6是本发明实施例二提供的另一种第一扩散膜层的结构示意图；
图7是本发明实施例三提供的第一扩散膜层的结构示意图；
图8是本发明实施例三提供的另一种第一扩散膜层的结构示意图；
图9是本发明实施例六提供的一种光学指纹显示模组的结构示意图；
图10是本发明实施例六提供的另一种光学指纹显示模组的结构示意图。
附图标记说明：
背光模组-1；
模组本体-101；
凹陷结构-102；
第一水平段-103；
倾斜段-104；
第二水平段-105；
棱镜膜-106；
第二扩散膜层-107；
导光板-108；
反射膜-109；
钢板-110；
显示模组-2；
显示盖板-201；
显示面板-202
指纹模组-3；
第一扩散膜层-4；
扩散粒子-401；
扩散基板-402；
指纹探测区域-403；
延伸段-5。
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。
为了实现智能手机全面屏的设计，如图1和图2所示，现有的一种LCD屏下指纹系统，该系统将指纹模组3隐藏在手机底部黑色边框，即手机底部的非显示区域以内，且该系统中指纹模组3位于手机底部背光模组1的凹陷结构内，当指纹模组3处于LCD液晶面板和背光模组1的凹陷结构之间时，LCD液晶面板和背光模组1之间被指纹模组3撑起一定的空气间隙，由此将会对LCD显示效果以及用户的视觉感受造成一定的影响，例如：如图2所示，从手机顶部方向观察，用户可以透过LCD液晶面板看到指纹模组3的侧壁，且指纹模组3的侧壁与手机原有黑边(即手机LCD液晶面板的非显示区)会存在色差，进而影响显示效果，而且由于上述空气间隙的存在，将导致从不同角度观察时，用户都能够察觉或感受到空气间隙的存在，且空气间隙区域显示存在一定的空间感，进而影响用户的视觉感受。为了解决现有LCD液晶面板和背光模组1之间被指纹模组3撑起一定的空气间隙，影响显示效果以及用户的视觉感受的问题，本发明提供了一种屏下指纹系统、光学指纹显示模组2及电子装置。
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4是本发明实施例一提供的一种屏下指纹系统的结构示意图。
如图4所示，本发明实施例提供了一种屏下指纹系统，应用于具有显示模组2和背光模组1的电子装置，屏下指纹系统包括指纹模组3，指纹模组3设在背光模组1和显示模组2之间，指纹模组3和显示模组2之间设有第一扩散膜层4，第一扩散膜层4用于遮挡指纹模组3以使得指纹模组3在显示模组2的正面不可见。
其中，本实施例中，如图4所示，指纹模组3位于背光模组1的凹陷结构内，以使背光模组1与显示模组2之间存在空气间隙，其中背光模组1的凹陷结构形成在电子装置的边缘区域。
其中，本实施例中，如图4所示，通过第一扩散膜层4的设置，使得指纹模组3位于第一扩散膜层4的下方，通过第一扩散膜层4挡住指纹模组3的侧壁外形，使得指纹模组3从显示模组2的表面不易被用户察觉，即使得所述指纹模组3在所述显示模组2的正面不可见；而且通过第一扩散膜层4的设置，入射光线穿过第一扩散膜层4时，使得入射光发生许多折射、反射与散射的现象，通过第一扩散膜层4可修正入射光线，形成均匀的面光源，即重新形成光源平面，以达到光学扩散的效果，将光线柔和均匀的散播出来，以照亮所述显示模组2，从而相较于现有技术，消除了指纹模组3的侧壁与LCD液晶面板的非显示区域存在的色差，提升显示效果，于此同时通过第一扩散膜层4对指纹模组3的侧壁的遮挡以及第一扩散膜层4能够将光线柔和均匀的散播出来照亮显示模组2，进而相较于现有技术中的LCD屏下指纹系统，够能消除空气间隙区域存在的空间感，继而提升用户的视觉感受。
其中，本实施例中，第一扩散膜层4覆盖在凹陷结构和指纹模组3之上，其中，第一扩散膜层4的可见光雾度不小于70％，使得第一扩散膜层4的可见光的成像度较差，且第一扩散膜层4用于将接收到的背光模组1的出射光重新形成光源平面，并照亮显示模组2，以消除背景技术中提及 的空气间隙导致的显示效果较差的问题。
其中，本实施例中，第一扩散膜层4可以为在涂覆或填充有扩散粒子401的扩散膜，第一扩散膜层4也可以为毛玻璃结构或者表面凹凸不平的能够使入射光发生散射产生匀光效果且对可见光具有较低的成像度的高透性膜层结构，即本实施例中，第一扩散膜层4包括但不仅限于涂覆或填充有扩散粒子401的扩散膜，在本实施例中，只需保证第一扩散膜层4挡住指纹模组3的侧壁外形，使得指纹模组3从显示模组2的表面不易被用户察觉，而且通过第一扩散膜层4的设置，能够使入射光发生散射产生匀光效果即可。
进一步的，本实施例中，第一扩散膜层4覆盖在凹陷结构和指纹模组之上，其中，第一扩散膜层的可见光雾度不小于70％，并将接收到的背光模组1的出射光重新形成光源平面，以照亮显示模组2，由于第一扩散膜层4的可见光雾度不小于70％，增加了可见光穿透第一扩散膜层4时的成像难度，使得可见光在第一扩散膜层4上的成像度较低，使得用户较难通过显示模组2的表面观察到指纹模组3，以消除指纹模组3的侧壁与显示模组2的非显示区之间存在的色差，进而提升显示效果以及用户的视觉感受。
其中，本实施例中，为了保证第一扩散膜层4对指纹模组3的覆盖效果，第一扩散膜层4的横截形状的面积不小于背光模组1的凹陷结构。
其中，本实施例中，通过将第一扩散膜层4遮挡在背光模组1的凹陷结构之上，能够更好的对指纹模组3的侧壁外形进行遮挡，进一步的，由于第一扩散膜层4上可见光透过后发生扩散，导致具有较低的成像度，因此，通过第一扩散膜层4的设置，能够使得用户很难从显示模组2的表面察觉到指纹模组3，且由于第一扩散膜层4能够将接收到的背光模组1的出射光重新形成光源平面，即通过第一扩散膜层4能够使入射光发生散射产生匀光效果，照亮显示模组2，因此，通过第一扩散膜层4能够消除指纹模组3的侧壁与显示模组2的非显示区之间存在的色差，进而提升显示效果以及用户的视觉感受。
其中，本实施例中，为了保证指纹模组3穿透第一扩散膜层4后仍然可以正常成像，实现指纹注册与识别功能，如图1所示，第一扩散膜层4上设 有指纹探测区域403，指纹探测区域403为第一扩散膜层4上指纹模组3接收指纹反射产生的反射光时，反射光通过第一扩散膜层4上的区域，指纹探测区域403的红外光雾度不大于20％，即保证第一扩散膜层4上的指纹探测区域403的红外光可以透过，而在一定程度上使可见光穿透时光线角度发生变化，成像度下降。
其中，本实施例中，雾度是指偏离入射光2.5°角以上的透射光强占总透射光强的百分数，雾度越大意味着薄膜光泽以及透明度尤其成像度下降。因此，第一扩散膜层4上指纹探测区域403的可见光的成像度较低，使得用户较难通过显示模组2的表面观察到指纹模组3，以消除指纹模组3的侧壁与显示模组2的非显示区之间存在的色差，进而提升显示效果以及用户的视觉感受，如图3所示，为相较于现有的LCD液晶面板消除色差及间隙空间感的显示模组2的外观显示图。
因此，本发明实施例提供屏下指纹系统包括指纹模组3，指纹模组3设在背光模组1的凹陷结构内，且指纹模组3位于背光模组1朝向显示模组2的一侧，指纹模组3和显示模组2之间设有第一扩散膜层4，通过在指纹模组3和显示模组2之间设置第一扩散膜层4，使指纹模组3位于第一扩散膜层4的下方，通过第一扩散膜层4挡住指纹模组3的侧壁外形，在第一扩散膜层4的作用下，将接收到的背光模组1的出射光重新形成光源平面，照亮显示模组2，从而消除指纹模组3的侧壁与显示模组2的非显示区存在的色差，与此同时消除空间间隙导致的空间感，使用户不易察觉或感受到空气间隙的存在，进而提升用户的视觉感受。本发明提供的一种屏下指纹系统、光学指纹显示模组2及电子装置解决了现有LCD液晶面板和背光模组1之间被指纹模组3撑起一定的空气间隙，影响显示效果以及用户的视觉感受的问题。
实施例二
图5本发明实施例二提供的第一扩散膜层的结构示意图，图6是本发明实施例二提供的另一种第一扩散膜层的结构示意图。
进一步的，在上述实施例一的基础上，在本实施例中，如图5和图6所示，第一扩散膜层4上分布有扩散粒子401。
其中，本实施例中，通过在第一扩散膜层4上分布扩散粒子401，在 扩散粒子401的作用下，光线在经过第一扩散膜层4时，扩散粒子401会改变光线的传播方向或路径，如：使光线会发生许多折射、反射与散射现象，如此便造成了光学扩散的效果，以增大第一扩散膜层4的可见光雾度，降低可见光的成像度，使用户较难通过显示模组2的表面观察到指纹模组3，以消除指纹模组3的侧壁与显示模组2的非显示区之间存在的色差，进而提升显示效果以及用户的视觉感受。
进一步的，在本实施例中，如图5和图6所示，扩散粒子401在第一扩散膜层4上朝着指纹模组3的方向上呈渐进式分布，扩散粒子401在第一扩散膜层4上的分布密度沿着朝向指纹模组3的外侧边缘的方向上逐步递增，也就是说扩散粒子401在第一扩散膜层4上靠近指纹模组3的外侧边缘的一侧分布密度越大，通过扩散粒子401在第一扩散膜层4上分布密度渐进式的分布，结合扩散粒子401本身的特性和结构，能够尽可能的弥补第一扩散膜层4上的亮度的一致性，进而提升显示模组2的显示效果。
其中，本实施例中，为了包括第一扩散膜层4能够更好的发生匀光、及光学散射效果，扩散粒子401为微细颗粒，微细颗粒的粒径为0.01um-0.10um，第一扩散膜层4上设有粒径大小不同扩散粒子401保证了光线不会从第一扩散膜层4中直射出去，从而起到了雾化的效果，使用户较难通过显示模组2的表面观察到指纹模组3，以消除指纹模组3的侧壁与显示模组2的非显示区之间存在的色差，进而提升显示效果以及用户的视觉感受。
其中，本实施例中，扩散粒子401采用透红外的扩散粒子401，以使波长为910nm-970nm的红外光透过的同时增大可见光雾度，降低可见光的成像能力，本实施例中，指纹探测区域403红外光的雾度不大于20％。
其中，本实施例中，扩散粒子401采用透红外的化学颗粒，即扩散粒子401为采用对红外线透过率较高的材料制备而成的颗粒物质，其中，现有技术中对红外线透过率较高的材料包括单晶多晶、玻璃、陶瓷、塑料、金刚石和类金刚石等多种品种，单晶体主要有锗、硅半导体作为红外光材料，另一类单晶体是离子晶体，为碱或碱土金属卤化物，该透红外光材料均为现有技术，在实际中，具体选用现有技术中的何种透红外材料，可以根据所采用的工艺以及相应的制作成本进行考量，在本实施例中，对于扩 散粒子401采用的对红外线透过率较高的材料并不做进一步限定。
其中，本实施例中，扩散粒子401可以为球形，扩散粒子401也可以为其他形状的颗粒形状，在本实施例中，只需保证，在扩散粒子401的作用下，光线在经过这些扩散粒子401时被聚焦到一定的出射角度内，从而达到增强出射光亮度的功能，保证光线不会从扩散膜中直射出去，起到一定的雾化效果即可。
其中，本实施例中，扩散粒子401分布在第一扩散膜层4的表面或第一扩散膜层4内，即本实施例中，扩散粒子401可以分布在第一扩散膜层4的表面，也可以分布在第一扩散膜层4内，在本实施例中，不论扩散粒子401在第一扩散膜层4上如何分布，只需保证分布有扩散粒子401的第一扩散膜层4能够起到一定的匀光和雾化效果即可。
其中，本实施例中提供另一种第一扩散膜层4结构，另一种第一扩散膜层4结构与上述第一扩散膜层4结构的不同之处在于，如图5所示，第一扩散膜层4上指纹探测区域403内的扩散粒子401的密度小于第一扩散膜层4上指纹探测区域403外围的分布密度，本实施例通过降低第一扩散膜层4上指纹探测区域403内扩散粒子401的分布密度，以使指纹探测区域403的红外光雾度不大于20％。
实施例三
进一步的，本实施例与实施例二不同的是，如图7和图8所示，扩散粒子401在第一扩散膜层4上均匀分布，通过在第一扩散膜层4上均匀分布的扩散粒子401使得第一扩散膜层4上的可见光雾度不小于70％，且第一扩散膜层4上的指纹探测区域403的红外光雾度不大于20％。
具体的，本实施例中，通过调整扩散粒子401在第一扩散膜层4上分布密度，能够使得第一扩散膜层4上的可见光雾度不小于70％。本实施例中，为了确保第一扩散膜层4上的指纹探测区域403的红外光雾度不大于20％。
具体的，如图7所示，本实施例可以通过统一调整扩散粒子401在第一扩散膜层4上分布密度，使得第一扩散膜层4上的指纹探测区域403的红外光雾度不大于20％；或者如图8所示，本实施例也可以在确保第一扩散膜层4上的可见光雾度不小于70％的基础上，通过降低指纹探测区域403内扩散 粒子401的分布密度，使得指纹探测区域403的红外光雾度不大于20％。
实施例四
进一步的，在上述实施例一和实施例二的基础上，如图4所示，背光模组1包括模组本体101，模组本体101靠近指纹模组3的一端设有凹陷结构102，指纹模组3位于凹陷结构102内。
其中，本实施例中，指纹模组3位于凹陷结构102且处于显示模组2和背光模组1之间，显示模组2和背光模组1之间被指纹模组3撑起一定的空气间隙，该空气间隙可以为垂直距离小于1.5mm的空气间隙，由于空气间隙的存在，将对会显示效果以及用户的视觉感受造成一定的影响，而正如上述实施例所述的通过位于指纹模组3和显示模组2之间的第一扩散膜层4，可以有效的消除该空气间隙对显示效果以及用户视觉感受造成的影响，进而提升显示效果和用户的视觉感受，在本实施例中，不再对其做进一阐述。
其中，本实施例中，凹陷结构102为模组本体101上形成的下沉式凹陷结构102。
需要说明的是，在模组本体101上形成下沉式结构的方式有很多，且依据采用不同的形成方式，将导致所形成的下沉式凹陷结构102可能也会有所不同。本实施例中，下沉式凹陷结构102可以通过设置一定的角度倾斜形成下沉式凹陷结构102，也可以通过向下凹陷的弧形连接在模组本体101上形成下沉式凹陷结构102，在本实施例中，不对下沉式凹陷结构102的形成方式及其结构做进一步限定，只需指纹模组3放置在凹陷结构102内时，背光模组1和显示模组2之间存在一定的空气间隙即可。
其中，本实施例中，模组本体101包括第一水平段103、倾斜段104和第二水平段105，倾斜段104位于第一水平段103和第二水平段105之间，倾斜段104的较高端与第一水平段103相接，倾斜段104的较低端与第二水平段105相接，倾斜段104和第二水平段105在模组本体101上形成的下沉式凹陷结构102，其中，指纹模组3位于第二水平段105上。
其中，本实施例中，第一水平段103、倾斜段104和第二水平段105为一体化结构，且倾斜段104的倾斜角度在实际应用中可以根据指纹模组 3的高度或者其他设计标准进行设置，即在本实施例中，对倾斜段104的倾斜角度不作进一步限定。
其中，本实施例中，第一扩散膜层4为倾斜段104和第二水平段105在第一扩散膜层4上的正投影区域，即第一扩散膜层4设置在倾斜段104和第二水平段105的正上方，用于遮挡背光模组1上的凹陷结构。
其中，本实施例中，当扩散粒子401在第一扩散膜层4上渐近式分布时，为了保证扩散粒子401在第一扩散膜层4上朝着指纹模组3外侧边缘的方向上呈渐近式分布，扩散粒子401在第一扩散膜层4上与倾斜段104相对应的区域的分布密度小于扩散粒子401在第一扩散膜层4上与第二水平段105相对应的区域的分布密度。
实施例五
进一步的，在上述实施例一至实施例三的基础上，本实施例中，第一扩散膜层4远离指纹模组3的一侧沿着显示模组2或背光模组1的水平方向延伸，直至与显示模组2或背光模组1的端部平齐，第一扩散膜层4的延伸段5位于显示模组2或背光模组1之间。
需要说明的是，本实施例中，第一扩散膜层4的延伸段5可以与显示模组2靠近背光模组1的一面贴合，第一扩散膜层4的延伸段5也可以与背光模组1靠近显示模组2的一面贴合，相应的，第一扩散膜层4可以与指纹模组3靠近显示模组2的一面贴合，第一扩散膜层4也可以与显示模组2靠近指纹模组3的一面贴合，在本实施例中，第一扩散膜层4和第一扩散膜层4的延伸段5为一体化结构，且其延伸段5上不排布或者少排布扩散粒子401，以降低扩散膜层对显示模组2显示亮度的影响。
其中，本实施例中，背光模组1透过第一扩散膜层4和第一扩散膜层4的延伸段5后的显示亮度的一致性大于85％。
需要说明的是，本实施例中，由于扩散粒子401在第一扩散膜层4上呈渐进式的渐进式分布，通过调整扩散粒子401的分布密度，使第一扩散膜层4和第一扩散膜层4的延伸段5的显示亮度的一致性大于85％，提升显示效果。
其中，本实施例中，第一扩散膜层4包括扩散基板402，扩散粒子401 分布在扩散基板402上，其中，本实施例中，扩散基板402为透明的扩散基板402，扩散基板402包括但不仅限于聚对苯二甲酸乙二醇酯(Polyethylene terephthalate，简称：PET)基材。
其中，本实施例中，扩散粒子401和扩散基板402为一体化结构，扩散粒子401可以沉积在扩散基板402的表面或者采用其他工艺分布在扩散基本内。
实施例六
图9是本发明实施例五提供的一种光学指纹显示模组的结构示意图，图10是本发明实施例五提供的另一种光学指纹显示模组的结构示意图。
进一步的，在上述实施例的基础上，如图9和图10所示，本实施例提供了一种光学指纹显示模组2，光学指纹显示模组2包括背光模组1、显示模组2、以及如上任一实施例中的屏下指纹系统，屏下指纹系统包括指纹模组3，指纹模组3设在背光模组1和显示模组2之间，且指纹模组3设在背光模组1的凹陷结构内，指纹模组3和显示模组2之间设有第一扩散膜层4。
其中，本实施例中，如图4、图9和图10所示，通过在光学指纹显示模组2内第一扩散膜层4的设置，使得指纹模组3位于第一扩散膜层4的下方，通过第一扩散膜层4挡住指纹模组3的侧壁外形，使得指纹模组3从显示模组2的表面不易被用户察觉，而且通过第一扩散膜层4的设置，入射光线从第一扩散膜层4中穿过时，形成均匀的面光源，即重新形成光源平面，以达到光学扩散的效果，将光线柔和均匀的散播出来，以照亮所述显示模组2，从而相较于现有技术，消除指纹模组3的侧壁与LCD液晶面板的非显示区域存在的色差，提升显示效果，而且通过第一扩散膜层4对指纹模组3的侧壁的遮挡以及第一扩散膜层4能够将光线柔和均匀的散播出来照亮显示模组2，进而相较于现有技术中的LCD屏下指纹系统，够能消除空气间隙区域存在的空间感，继而提升用户的视觉感受。
其中，本实施例中，第一扩散膜层4覆盖在凹陷结构和指纹模组之上，其中，第一扩散膜层4的可见光雾度不小于70％，第一扩散膜层4用于将接收到背光模组1的出射光后重新形成光源平面，以照亮显示模组2。
其中，如上述实施例中，第一扩散膜层4的指纹探测区域403红外光的雾度不大于20％，即指纹探测区域403波长在910nm-970nm的红外光点透过率大于80％，从而以视觉效果能够挡住指纹模组3的侧壁外形，消除显示空间感。
其中，本实施例中，背光模组1包括模组本体101，模组本体101靠近指纹模组3的一端上设有凹陷结构102，指纹模组3位于凹陷结构102内。
其中，本实施例中的凹陷结构102在实施例三种已进行说明，在本实施例中，不再对其结构作进一步阐述。
其中，本实施例中，模组本体101包括导光板108和非导光板108结构，非导光板108结构包括棱镜膜层106、第二扩散膜层107、反射膜109层和钢板110，第二扩散膜层107和所述棱镜膜层106依次堆叠在导光板108靠近第一扩散膜的一侧，反射膜109层和钢板110依次堆叠在导光板108上与第一扩散膜相反的一侧。指纹模组3位于棱镜膜层106和第一扩散膜层4之间。
需要说明的是，本实施例中的，通过第一扩散膜层4和/或延伸段5的设置，除了能够解决现有LCD液晶面板和背光模组1之间被指纹模组3撑起一定的空气间隙，影响显示效果以及用户的视觉感受的问题之外，由于第一扩散膜层4和/或延伸段5位于背光模组1的最上侧，即棱镜膜层106的上方，还能够更加光源的柔和性，兼具扩散及保护棱镜膜层106的作用。其中，模组本体101为现有技术，在本实施例中，不再对其组成膜层做进一步阐述。
其中，本实施例中，显示模组至少包括显示盖板201和显示面板202，显示盖板201位于显示面板202之上，即显示盖板201位于显示面板202远离背光模组的一侧，且显示盖板201与显示面板202远离背光模组的一侧贴合，第一扩散膜层和第一扩散膜层的延伸段位于显示面板202之下并与显示面板202贴合。
其中，本实施例中，显示盖板201包括但不仅限于玻璃盖板，显示面板202包括但不仅限于液晶面板，显示模组为现有技术，在本实施例中不再对其作进一步阐述。
实施例七
进一步的，在上述实施例的基础上，本发明实施例提供了一种电子装置，电子装置包括上述实施例五中的光学指纹显示模组2，其中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 (28)

  1. 一种屏下指纹系统，应用于具有显示模组和背光模组的电子装置，其特征在于，所述屏下指纹系统包括指纹模组，所述指纹模组设在所述背光模组和所述显示模组之间，所述指纹模组和所述显示模组之间设有第一扩散膜层，所述第一扩散膜层用于遮挡所述指纹模组以使得所述指纹模组在所述显示模组的正面不可见。
  2. 根据权利要求1所述的一种屏下指纹系统，其特征在于，所述指纹模组位于所述背光模组的凹陷结构内，以使所述背光模组与所述显示模组之间存在空气间隙，其中所述背光模组的凹陷结构形成在所述电子装置的边缘区域。
  3. 根据权利要求2所述的一种屏下指纹系统，其特征在于，所述第一扩散膜层覆盖在所述凹陷结构和所述指纹模组之上，其中，所述第一扩散膜层的可见光雾度不小于70％，且所述第一扩散膜层用于将接收到的所述背光模组的出射光重新形成光源平面，并照亮所述显示模组。
  4. 根据权利要求3所述的一种屏下指纹系统，其特征在于，所述第一扩散膜层上设有指纹探测区域，所述指纹探测区域为所述第一扩散膜层上所述指纹模组接收经指纹反射产生的反射光时，所述反射光通过所述第一扩散膜层上的区域。
  5. 根据权利要求4所述的一种屏下指纹系统，其特征在于，所述指纹探测区域的红外光雾度不大于20％。
  6. 根据权利要求1-5中所述的一种屏下指纹系统，其特征在于，所述第一扩散膜层上分布有扩散粒子。
  7. 根据权利要求6所述的一种屏下指纹系统，其特征在于，所述扩散粒子在所述第一扩散膜层上均匀分布。
  8. 根据权利要求6所述的一种屏下指纹系统，其特征在于，所述扩散粒子在所述第一扩散膜层上朝着所述指纹模组的方向上呈渐进式分布。
  9. 根据权利要求8所述的一种屏下指纹系统，其特征在于，所述扩散粒子在所述第一扩散膜层上的分布密度沿着朝向所述指纹模组的外侧边缘的方向上逐步递增。
  10. 根据权利要求6-9中任一所述的一种屏下指纹系统，其特征在于， 所述扩散粒子为微细颗粒，所述微细颗粒的粒径为0.01um-0.10um。
  11. 根据权利要求6-10中任一所述的一种屏下指纹系统，其特征在于，所述扩散粒子采用透红外的扩散粒子，以使波长为910nm-970nm的红外光透过。
  12. 根据权利要求6-11中任一所述的一种屏下指纹系统，其特征在于，所述扩散粒子分布在所述第一扩散膜层的表面或所述第一扩散膜层内。
  13. 根据权利要求1-12任一所述的一种屏下指纹系统，其特征在于，所述背光模组包括模组本体，所述模组本体靠近所述指纹模组的一端设有所述凹陷结构，所述指纹模组位于所述凹陷结构内。
  14. 根据权利要求13所述的一种屏下指纹系统，其特征在于，所述凹陷结构为所述模组本体上形成的下沉式凹陷结构。
  15. 根据权利要求14所述的一种屏下指纹系统，其特征在于，所述模组本体包括第一水平段、倾斜段和第二水平段，所述倾斜段位于所述第一水平段和所述第二水平段之间，所述倾斜段和所述第二水平段在所述模组本体上形成所述的下沉式凹陷结构。
  16. 根据权利要求14所述的一种屏下指纹系统，其特征在于，所述第一扩散膜层为所述倾斜段和所述第二水平段在所述第一扩散膜层上的正投影区域。
  17. 根据权利要求15或16所述的一种屏下指纹系统，其特征在于，所述扩散粒子在所述第一扩散膜层上渐进式分布时，所述扩散粒子在所述第一扩散膜层上与所述倾斜段相对应的区域的分布密度小于所述扩散粒子在所述第一扩散膜层上与所述第二水平段相对应的区域的分布密度。
  18. 根据权利要求1所述的一种屏下指纹系统，其特征在于，所述第一扩散膜层远离所述指纹模组的一侧沿着所述显示模组或所述背光模组的水平方向延伸，直至与所述显示模组或所述背光模组的端部平齐。
  19. 根据权利要求18所述的一种屏下指纹系统，其特征在于，所述第一扩散膜层的延伸段位于所述显示模组或所述背光模组之间。
  20. 根据权利要求18或19所述的一种屏下指纹系统，其特征在于，所述背光模组透过所述第一扩散膜层和第一扩散膜层的延伸段后的显示亮度的一致性大于85％。
  21. 根据权利要求6-20中任一所述的一种屏下指纹系统，其特征在于，所述第一扩散膜层包括扩散基板，所述扩散粒子分布在所述扩散基板上。
  22. 根据权利要求21所述的一种屏下指纹系统，其特征在于，所述扩散粒子和所述扩散基板为一体化结构。
  23. 一种光学指纹显示模组，其特征在于，所述光学指纹显示模组包括背光模组、显示模组、以及如上述权利1-22中任一所述的屏下指纹系统，所述屏下指纹系统包括指纹模组，所述指纹模组设在所述背光模组和所述显示模组之间，且所述指纹模组设在所述背光模组的凹陷结构上，所述指纹模组和所述显示模组之间设有第一扩散膜层。
  24. 根据权利要求23所述的一种光学指纹显示模组，其特征在于，所述第一扩散膜层覆盖在所述凹陷结构和所述指纹模组之上，其中，所述第一扩散膜层的可见光雾度不小于70％，所述第一扩散膜层用于将接收到所述背光模组的出射光后重新形成光源平面，并照亮所述显示模组。
  25. 根据权利要求23或24所述的一种光学指纹显示模组，其特征在于，所述背光模组包括模组本体，所述模组本体靠近所述指纹模组的一端上设有所述凹陷结构，所述指纹模组位于所述凹陷结构内。
  26. 根据权利要求25所述的一种光学指纹显示模组，其特征在于，所述模组本体包括导光板和非导光板结构，所述非导光板结构包括棱镜膜层、第二扩散膜层、反射膜层和钢板，所述第二扩散膜层和所述棱镜膜层依次堆叠在所述导光板靠近所述第一扩散膜的一侧，所述反射膜层和所述钢板依次堆叠在所述导光板上与所述第一扩散膜相反的一侧。
  27. 根据权利要求26所述的一种光学指纹显示模组，其特征在于，所述指纹模组位于所述棱镜膜层和所述第一扩散膜层之间。
  28. 一种电子装置，其特征在于，所述电子装置包括上述权利要求23-27中任一所述的光学指纹显示模组。
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