CN110785771B - Under-screen optical fingerprint identification system, fingerprint identification display device and electronic equipment - Google Patents

Under-screen optical fingerprint identification system, fingerprint identification display device and electronic equipment Download PDF

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Publication number
CN110785771B
CN110785771B CN201980002840.2A CN201980002840A CN110785771B CN 110785771 B CN110785771 B CN 110785771B CN 201980002840 A CN201980002840 A CN 201980002840A CN 110785771 B CN110785771 B CN 110785771B
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Prior art keywords
unit
fingerprint
reflection unit
liquid crystal
crystal panel
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CN110785771A (en
Inventor
李顺展
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Shenzhen Goodix Technology Co Ltd
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Shenzhen Goodix Technology Co Ltd
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Priority claimed from PCT/CN2019/072598 external-priority patent/WO2020150879A1/en
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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
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • 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
    • 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

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Image Input (AREA)

Abstract

The invention provides an under-screen optical fingerprint identification system, a fingerprint identification display device and electronic equipment. The reflection unit and the optical fingerprint sensor are arranged between the liquid crystal panel and the backlight module and correspond to the non-display area of the liquid crystal panel, the reflection unit is used for receiving return light formed by the fact that the detection light emitted by the fingerprint detection light source irradiates the finger above the fingerprint detection area and reflects the return light to the optical fingerprint sensor, the fingerprint detection area is located in the display area of the liquid crystal panel, the optical fingerprint sensor user receives the return light reflected by the reflection unit and generates a fingerprint image, detection of the optical fingerprint under the screen is achieved, the reflection unit is provided with an extension portion used for extending into the display area, the extension portion can enable visible light emitted by the backlight module to penetrate, the display effect is guaranteed, meanwhile, the width of the frame is reduced, and the narrow frame requirement of the user is met.

Description

Under-screen optical fingerprint identification system, fingerprint identification display device and electronic equipment
Technical Field
The present application relates to the field of fingerprint identification technologies, and in particular, to an under-screen optical fingerprint identification system, a fingerprint identification display device, and an electronic device.
Background
The fingerprint identification technology is used for identifying fingerprint information by sensing and analyzing signals of valleys and ridges of the fingerprint through the fingerprint identification module, has the advantages of high safety and convenience and quickness in operation, and is widely applied to electronic products. The implementation modes of the fingerprint imaging technology comprise various technologies such as optical imaging, capacitive imaging and ultrasonic imaging, wherein the optical fingerprint identification technology gradually becomes the main stream of the fingerprint identification technology due to the characteristics of strong penetrating capacity, full screen placement support, simple product structural design and the like, and is widely applied to electronic devices.
At present, an optical fingerprint identification system generally comprises an optical fingerprint detection module and a fingerprint detection light source lamp, and can further enhance imaging quality, and further comprises an optical lens, a reflecting element and the like, when the optical fingerprint identification system is arranged in an LCD display screen, the optical fingerprint identification system is positioned under the display screen, specifically, because of the light opacity of a steel plate, a reflecting film and the like in a backlight module, the optical fingerprint detection module, the fingerprint detection light source and the like are generally positioned between the backlight module and a liquid crystal panel, when fingerprint detection is carried out, light emitted by the fingerprint detection light source irradiates a finger of the liquid crystal panel, after reflection, return light with fingerprint information is formed, and the return light irradiates the optical fingerprint identification module after passing through the liquid crystal panel so as to carry out fingerprint identification detection.
However, in order to ensure the display effect of the display module, the optical fingerprint detection module, the fingerprint detection light source, the optical lens, the reflecting element and the like correspond to the non-display area of the display module, that is, the optical fingerprint identification system is hidden in the frame of the electronic device, but the width of the frame of the electronic device is limited by the width dimension of the optical fingerprint identification system, so that the requirement of the narrow frame of the user cannot be met.
Disclosure of Invention
The invention provides an under-screen optical fingerprint identification system, a fingerprint identification display device and electronic equipment, which are used for solving the problem that the electronic equipment cannot meet the requirement of a narrow frame due to the fact that the size of the optical fingerprint identification system in the conventional LCD display screen limits the frame of the electronic equipment.
A first aspect of the present invention provides an optical fingerprint identification system under a screen, applied to an electronic device having a backlight module and a liquid crystal panel, comprising: an optical fingerprint sensor and a reflection unit;
the reflection unit is used for receiving return light formed by the fact that the detection light emitted by the fingerprint detection light source irradiates the finger above the fingerprint detection area and reflecting the return light to the optical fingerprint sensor, and the fingerprint detection area is located in the display area of the liquid crystal panel;
The optical fingerprint sensor is used for receiving the return light reflected by the reflecting unit and generating a fingerprint image;
the reflection unit and the optical fingerprint sensor are arranged between the liquid crystal panel and the backlight module and correspond to a non-display area of the liquid crystal panel, the reflection unit is provided with an extension part which is used for extending into the display area, and the extension part can enable visible light emitted by the backlight module to pass through.
In a specific embodiment of the present invention, further comprising: the fingerprint detection light source is used for emitting the detection light to a fingerprint detection area positioned in a display area of the liquid crystal panel so as to reflect the finger to form the return light.
In a specific embodiment of the present invention, the reflection unit includes: a first reflection unit for reflecting the return light to the second reflection unit and a second reflection unit for reflecting the return light reflected by the first reflection unit to the optical fingerprint sensor;
the first reflecting unit is positioned at one side of the optical fingerprint sensor facing the display area, the second reflecting unit corresponds to the position of the optical fingerprint sensor, and one end of the first reflecting unit extends into the display area to form the extension part.
In a specific embodiment of the invention, the length of the extension of the first reflecting unit in the display area is 1-2mm.
In a specific embodiment of the present invention, further comprising: the first reflecting unit and the second reflecting unit are respectively positioned at two sides of the optical element, so that the return light reflected by the first reflecting unit is projected onto the second reflecting unit through the optical element.
In a specific embodiment of the present invention, the incident surface of the optical element is disposed toward the first reflecting unit, the exit surface of the optical element is disposed toward the second reflecting unit, so that the return light reflected by the first reflecting unit enters the optical element from the incident surface and exits from the exit surface to be projected to the second reflecting unit, and the second reflecting unit reflects the return light to the optical fingerprint sensor.
In a specific embodiment of the present invention, the optical element has a transmission unit on an exit surface thereof, and the transmission unit is configured to concentrate and project the return light projected onto the optical element to the second reflection unit.
In a specific embodiment of the present invention, further comprising: the virtual key unit is positioned on the liquid crystal panel, and corresponds to the position of the extension part, so that the influence of the extension part on the display of the liquid crystal panel is reduced or eliminated.
In a specific embodiment of the present invention, the fingerprint detection light source is located at a side of the liquid crystal panel near the non-display area, or the fingerprint detection light source is located between the liquid crystal panel and the backlight module.
In a specific embodiment of the present invention, the backlight module further includes a substrate, the substrate is located between the backlight module and the liquid crystal panel, and the fingerprint detection light source, the reflection unit, and the optical fingerprint sensor are all located on a surface of the substrate facing the liquid crystal panel.
In a specific embodiment of the present invention, the fingerprint detection light source is an infrared fingerprint detection light source.
A second aspect of the present invention provides an electronic device comprising an off-screen optical fingerprint identification system as described in any one of the preceding claims.
The third aspect of the invention provides a fingerprint identification display device, which comprises a display module and an optical fingerprint identification module, wherein the display module comprises a liquid crystal panel and a backlight module arranged on the back of the liquid crystal panel; the optical fingerprint identification module comprises a fingerprint detection light source, a reflection unit and an optical fingerprint sensor;
The fingerprint detection light source is used for emitting detection light to a fingerprint detection area positioned in the liquid crystal panel display area, the detection light is reflected by a finger on the fingerprint detection area to form return light, the reflection unit is used for receiving the return light and reflecting the return light to the optical fingerprint sensor, and the optical fingerprint sensor is used for receiving the return light and generating a fingerprint image; the reflection unit and the optical fingerprint sensor are arranged between the liquid crystal panel and the backlight module and correspond to a non-display area of the liquid crystal panel, the reflection unit is provided with an extension part which is used for extending into the display area, and the extension part can enable visible light emitted by the backlight module to pass through.
In a specific embodiment of the present invention, the reflection unit includes: a first reflection unit for reflecting the return light to the second reflection unit and a second reflection unit for reflecting the return light reflected by the first reflection unit to the optical fingerprint sensor;
the first reflecting unit is positioned at one side of the optical fingerprint sensor facing the display area, the second reflecting unit corresponds to the position of the optical fingerprint sensor, and one end of the first reflecting unit extends into the display area to form the extension part.
In a specific embodiment of the present invention, the length of the extension portion of the first reflection unit located in the display area is 1-2mm.
In a specific embodiment of the present invention, further comprising: the first reflecting unit and the second reflecting unit are respectively positioned at two sides of the optical element, so that the return light reflected by the first reflecting unit is projected onto the second reflecting unit through the optical element.
In a specific embodiment of the present invention, the incident surface of the optical element is disposed toward the first reflecting unit, the exit surface of the optical element is disposed toward the second reflecting unit, so that the return light reflected by the first reflecting unit enters the optical element from the incident surface and exits from the exit surface to be projected to the second reflecting unit, and the second reflecting unit reflects the return light to the optical fingerprint sensor.
In a specific embodiment of the present invention, the optical element has a transmission unit on an exit surface thereof, and the transmission unit is configured to concentrate and project the return light projected onto the optical element to the second reflection unit.
In a specific embodiment of the present invention, further comprising: the virtual key unit is positioned on the liquid crystal panel, and corresponds to the position of the extension part, so that the influence of the extension part on the display of the liquid crystal panel is reduced or eliminated.
In a specific embodiment of the present invention, the fingerprint detection light source is located at a side of the liquid crystal panel near the non-display area, or the fingerprint detection light source is located between the liquid crystal panel and the backlight module.
In a specific embodiment of the present invention, the backlight module further includes a substrate, the substrate is located between the backlight module and the liquid crystal panel, and the fingerprint detection light source, the reflection unit, and the optical fingerprint sensor are all located on a surface of the substrate facing the liquid crystal panel.
In a specific embodiment of the present invention, the fingerprint detection light source is an infrared fingerprint detection light source.
The invention provides an under-screen optical fingerprint identification system, a fingerprint identification display device and electronic equipment. Meanwhile, the extension part is used for extending into the display area, the extension part can enable visible light emitted by the backlight module to penetrate, namely, the extension part of the reflection unit extends into the display area, so that the width of the reflection unit in the non-display area is reduced, the width dimension of a frame of the non-display area of the electronic equipment can be reduced, the extension part can reflect return light, and meanwhile, the extension part can enable the visible light emitted by the backlight module to penetrate, so that the display effect is not affected, namely, the display effect is ensured, the width of the frame is reduced, the visual perception and the use experience of a user are improved, and the problem that the electronic equipment cannot meet the requirement of a narrow frame due to the fact that the frame of the electronic equipment is limited by the dimension of an optical fingerprint identification system in the conventional LCD display screen is solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of an application of an existing under-screen optical fingerprint recognition system;
FIG. 2 is a schematic top view of an on-screen optical fingerprint recognition system according to a first embodiment of the present application;
FIG. 3 is a schematic diagram of an application of an on-screen optical fingerprint recognition system according to an embodiment of the present application;
FIG. 4 is a schematic diagram of an electronic device with an optical fingerprint recognition system according to a first embodiment of the present application;
fig. 5 is a schematic partial view of an electronic device with a virtual key unit in an optical fingerprint recognition system according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a portion of another electronic device with a virtual key unit in an optical fingerprint recognition system according to an embodiment of the present application;
Fig. 7 is a schematic diagram of a portion of an electronic device with a virtual key unit in an optical fingerprint recognition system according to a first embodiment of the present application.
Reference numerals illustrate:
100-a liquid crystal panel; 101-frame; 200-a backlight module; 300-an under-screen optical fingerprint recognition system; 301-an optical fingerprint sensor; 302-a reflection unit; 312-a first reflection unit; 322-extensions; 313-a second reflecting unit; 303-a fingerprint detection light source; 304-an optical element; 305-virtual key unit; 306-a substrate; 400-electronic device.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The technical scheme of the application is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
Example 1
Fig. 1 is a schematic diagram of an application of an existing optical fingerprint recognition system under a screen, fig. 2 is a schematic diagram of a top view of an optical fingerprint recognition system under a screen according to an embodiment of the present invention, fig. 3 is a schematic diagram of an application of an optical fingerprint recognition system under a screen according to an embodiment of the present invention, fig. 4 is a schematic diagram of a part of an electronic device with an optical fingerprint recognition system according to an embodiment of the present invention, fig. 5 is a schematic diagram of a part of an electronic device with a virtual key unit in an optical fingerprint recognition system according to an embodiment of the present invention, fig. 6 is a schematic diagram of a part of another electronic device with a virtual key unit in an optical fingerprint recognition system according to an embodiment of the present invention, and fig. 7 is a schematic diagram of a part of another electronic device with a virtual key unit in an optical fingerprint recognition system according to an embodiment of the present invention.
The present embodiment provides an optical fingerprint identification system under a screen, which is suitable for an electronic device having a backlight module 200 and a liquid crystal panel 100, in particular, the backlight module 200 is located at the back of the liquid crystal panel 100, the backlight module 200 is used for providing visible light to the liquid crystal panel 100, and the function of the backlight module 200 is to provide sufficient brightness and uniformly distributed light sources so that the liquid crystal panel 100 can normally display images, and the electronic device may further include a cover plate, wherein the cover plate is located on one side of the liquid crystal panel 100 away from the backlight module 200.
In this embodiment, the under-screen optical fingerprint recognition system 300 includes: the fingerprint detection device comprises an optical fingerprint sensor 301 and a reflection unit 302, wherein the reflection unit 302 is used for receiving return light formed by irradiating detection light emitted by a fingerprint detection light source onto a finger above a fingerprint detection area and reflecting the return light to the optical fingerprint sensor 301, the optical fingerprint sensor 301 is used for receiving the return light reflected by the reflection unit and generating a fingerprint image, specifically, in the embodiment, the fingerprint detection area is positioned in a display area of the liquid crystal panel 100, after irradiating the detection light emitted by the fingerprint detection light source onto the finger on the fingerprint detection area, the return light with fingerprint information is reflected by the finger, the return light irradiates the reflection unit 302, the reflection unit 302 receives the return light and reflects the return light onto the optical fingerprint sensor 301, the optical fingerprint sensor 301 receives the return light reflected by the reflection unit 302 and generates the fingerprint image according to the information of the return light, and the fingerprint image is converted into an electrical signal, so that fingerprint detection and identification can be realized.
As shown in fig. 1, the reflection unit 302 and the optical fingerprint sensor 301 are disposed between the liquid crystal panel 100 and the backlight module 200 and correspond to a non-display area of the liquid crystal panel 100, and since the reflection unit 302 and the optical fingerprint sensor 301 disposed between the liquid crystal panel 100 and the backlight module 200 can block light from the backlight module 200 to the liquid crystal panel 100, the disposition positions of the reflection unit 302 and the optical fingerprint sensor 301 correspond to the non-display area, so as to ensure the display effect of the display area, and the non-display area may be a bottom frame area, a top frame area, or two side frames of the electronic device, as shown in fig. 1, so that the width dimensions of the reflection unit 302 and the optical fingerprint sensor 301 limit the width of the frame 101 of the non-display area, and cannot further reduce the frame.
Based on the above-mentioned problem, in order to further realize a narrow bezel to meet the user requirement, in this embodiment, as shown in fig. 2 and 3, the reflection unit 302 has an extension portion 322 for extending into the display area, that is, a portion of the reflection unit 302 is the extension portion 322, the extension portion 322 extends into the display area, the extension portion 322 may be used for reflecting the return light, and meanwhile, the extension portion 322 can make the visible light emitted by the backlight module 200 transmit, that is, the extension portion 322 extending into the display area does not affect the light propagation between the backlight module 200 and the liquid crystal panel 100, and does not affect the display effect, and meanwhile, the extension portion 322 of the reflection unit 302 extends into the display area, so that the width of the reflection unit 302 located in the non-display area is reduced, that is, the width dimension of the bezel 101 in the non-display area is reduced, the width of the bezel 101 is reduced while the display effect is ensured, the visual feeling and the use experience of the user is improved, and the requirement of the narrow bezel is met.
It should be noted that, in the present embodiment, the extension portion 322 of the reflection unit 302 may reflect the return light formed after the finger reflection, and may also transmit the visible light emitted by the backlight module 200, so that the detection light emitted by the fingerprint detection light source and the visible light of the backlight module 200 belong to different wavelengths, specifically, the detection light emitted by the fingerprint detection light source is non-visible light, or may be visible light, but the wavelength of the visible light should be different from that of the visible light emitted by the backlight module 200. In this embodiment, there is no other requirement on the configuration of the reflecting unit 302, so that the extending portion 322 of the reflecting unit 302 can reflect the detection light and transmit the visible light emitted by the backlight module 200, for example, in this embodiment, the reflecting unit 302 may be a reflecting mirror, the detection light may be infrared light, and the transmittance of the reflecting mirror to the visible light (390-760 nm) is 90% -100% within the range of 0 ° to 70 ° of incident angle, so as to ensure that the extending portion of the reflecting unit does not affect the display of the image; the reflectivity of the reflecting mirror to infrared light (850-940 nm) is 90-100% within the range of the incident angle of 40-80 degrees, so that the extension part of the reflecting unit can well reflect infrared light, and the fingerprint detection quality is ensured.
In this embodiment, the fingerprint detection area is located in the display area of the liquid crystal panel 100, specifically, the fingerprint detection area may be located on the cover plate corresponding to the display area, and the fingerprint detection area may be a part or multiple parts of the area defined in the display area, or the fingerprint detection area may cover the whole display area.
In this embodiment, when a finger is detected, the finger is placed on the fingerprint detection area, the fingerprint detection light source emits detection light to the fingerprint detection area, the detection light irradiates the finger on the fingerprint detection area, then the detection light is reflected by the finger to form return light with fingerprint information, the return light irradiates the reflection unit 302 and then is reflected to the optical fingerprint sensor 301, the optical fingerprint sensor 301 receives the return light, and a fingerprint image can be produced according to the return light, so that the comparison and identification of the fingerprints are realized.
In this embodiment, the reflection unit 302 and the optical fingerprint sensor 301 are disposed between the liquid crystal panel 100 and the backlight module 200, and specifically, a portion vertically opposite to the reflection unit 302 and the fingerprint sensor is a portion of the liquid crystal panel 100, or is a portion of the cover plate, or may be other non-display components.
In this embodiment, the reflection unit 302 may have a reflection surface for being disposed toward the liquid crystal panel 100 to receive the return light reflected by the finger on the display area of the liquid crystal panel 100, and at the same time, be disposed toward the photosensitive area of the optical fingerprint sensor 301 to reflect the return light to the optical fingerprint sensor 301.
In this embodiment, the reflection unit 302 may include a plurality of reflection units 302, and the reflection unit 302 may be parallel to the optical fingerprint sensor 301 and the liquid crystal panel 100, the backlight module 200, and the like, and the extension portion 322 may be a portion of the reflection unit 302 beyond the optical fingerprint sensor 301 in the horizontal direction.
In this embodiment, the optical fingerprint sensor 301 may be an optical fingerprint sensor in the prior art, and specific constituent structures thereof may be referred to the optical fingerprint sensor in the prior art, which is not described in detail in this embodiment.
The optical fingerprint identification system 300 under a screen provided in this embodiment includes an optical fingerprint sensor 301 and a reflection unit 302, wherein the reflection unit 302 and the optical fingerprint sensor 301 are disposed between the liquid crystal panel 100 and the backlight module 200 and correspond to a non-display area of the liquid crystal panel 100, the reflection unit 302 is configured to receive return light formed by irradiating a finger above the fingerprint detection area with detection light emitted by a fingerprint detection light source, and reflect the return light to the optical fingerprint sensor 301, and the optical fingerprint sensor 301 is configured to receive the return light reflected by the reflection unit 302 and generate a fingerprint image, thereby realizing detection of an optical fingerprint under a screen. Meanwhile, the reflective unit 302 has an extension portion 322 for extending into the display area, and the extension portion 322 can enable the visible light emitted by the backlight module 200 to pass through, that is, the extension portion 322 of the reflective unit 302 extends into the display area, so that the width of the reflective unit 302 located in the non-display area is reduced, that is, the width dimension of the frame 101 in the non-display area can be reduced, the extension portion 322 can reflect the return light, and meanwhile, the extension portion 322 can enable the visible light emitted by the backlight module 200 to pass through, so that the display effect is not affected, that is, the width of the frame 101 is reduced while the display effect is ensured, and the visual experience and the use experience of a user are improved. The problem that in the existing LCD display screen, the electronic equipment cannot meet the requirement of a narrow frame due to the fact that the electronic equipment frame is limited by the size of the optical fingerprint identification system is solved.
Further, in this embodiment, as shown in fig. 2, the under-screen optical fingerprint recognition system 300 further includes: the fingerprint detection light source 303, the fingerprint detection light source 303 is configured to emit detection light to a fingerprint detection area located in a display area of the liquid crystal panel 100, so that when the fingerprint detection light source 303 emits detection light to the fingerprint detection area, the detection light is reflected by the finger to form return light when the detection light irradiates the finger in the fingerprint detection area.
In this embodiment, the fingerprint detection light source 303 may be an infrared fingerprint detection light source, that is, the detection light emitted by the fingerprint detection light source 303 is infrared light, so that when the emitted detection light irradiates the fingerprint detection area, the detection light is invisible to the user, compared with the case that the visible light is used as the detection light, when the fingerprint is detected, the detection area does not generate visible brightness, the brightness generated during each detection can be avoided, the use experience of the user is reduced, and meanwhile, the influence of the detection light emitted by the fingerprint detection light source 303 on the display effect can also be avoided.
In this embodiment, the infrared fingerprint detection light source may be a Light Emitting Diode (LED), a Vertical Cavity Surface Emitting Laser (VCSEL), a Laser Diode (Laser Diode), or the like, which is not limited in this embodiment.
Further, in the present embodiment, the reflection unit 302 includes: as shown in fig. 2 and 3, specifically, in this embodiment, the first reflection unit 312 is located on a side of the optical fingerprint sensor 301 facing the display area, the second reflection unit 313 corresponds to a position of the optical fingerprint sensor 301, the first reflection unit 312 is configured to reflect the return light to the second reflection unit 313, the second reflection unit 313 is configured to reflect the return light reflected by the first reflection unit 312 to the optical fingerprint sensor 301, that is, in this embodiment, the return light reflected by the finger is irradiated to the first reflection unit 312, the first reflection unit 312 reflects the return light to the second reflection unit 313, the second reflection unit 313 receives the return light and reflects the return light to the optical fingerprint sensor 301, and the optical fingerprint sensor 301 can form a fingerprint image according to the return light, so as to realize detection and identification of the optical fingerprint.
In this embodiment, one end of the first reflecting unit 312 extends into the display area to form an extension portion 322, as shown in fig. 3, and one end of the first reflecting unit 312 facing away from the optical fingerprint sensor 301 extends into the display area to form an extension portion 322, that is, the first reflecting unit 312 is partially located in the display area, so that the width of the first reflecting unit 312 in the non-display area is reduced, that is, the width of the frame 101 in the non-display area can be reduced. In addition, compared with a single reflection unit, the reflection unit 302 includes the first reflection unit 312 and the second reflection unit 313, the first reflection unit 312 and the second reflection unit 313 reflect the return light to the second reflection unit 313, and then the second reflection unit 313 reflect the return light to the optical fingerprint sensor 301, so that the optical path of the return light is folded, and the distance between the reflection unit 302 and the optical fingerprint sensor 301 can be reduced, thereby effectively reducing the thickness required by the optical fingerprint identification system, reducing the thickness of the electronic device, and further improving the hand feeling and the use experience of the user.
In this embodiment, the first reflecting unit 312 may have a reflecting surface facing the fingerprint detection area of the liquid crystal panel 100 and facing the second reflecting unit 313 to ensure that the return light reflected by the finger is irradiated onto the reflecting surface and reflected by the reflecting surface to the second reflecting unit 313, wherein, as shown in fig. 2, the fingerprint detection area of the liquid crystal panel 100 and the second reflecting unit 313 may be located at two sides of the optical axis of the reflecting surface of the first reflecting unit 312. The second reflection unit 313 also has a reflection surface facing the first reflection unit 312 and also facing the optical fingerprint sensor 301 to ensure that the second reflection unit 313 receives and reflects the probe light reflected by the first reflection unit 312 to the optical fingerprint sensor 301, and the first reflection unit 312 and the optical fingerprint sensor 301 may be located at both sides of the optical axis of the reflection surface of the second reflection unit 313.
In this embodiment, when fingerprint detection is performed, a finger is placed on the fingerprint detection area of the display area, the fingerprint detection light source 303 emits detection light to the fingerprint detection area, the detection light irradiates on the finger and is reflected by the finger to form return light, the return light firstly irradiates on the first reflecting unit 312 and is reflected by the first reflecting unit 312 to the second reflecting unit 313, the second reflecting unit 313 reflects the return light onto the optical fingerprint sensor 301, and the optical fingerprint sensor 301 can generate a fingerprint image according to the return light, so as to realize fingerprint identification detection.
In this embodiment, as shown in fig. 2 and fig. 3, one end of the first reflection unit 312 extends into the display area to form an extension portion 322, and the specific length of the extension portion 322 may be selected according to the actual fingerprint detection requirement, in this embodiment, the length of the extension portion 322 may be 1-2mm, so that the length of the extension portion 322 is 1-2mm, which can reduce the width of the optical fingerprint recognition system as much as possible without affecting the display performance of the image in the display area, and further reduce the width of the frame 101.
Further, in this embodiment, as shown in fig. 2 and 3, the under-screen optical fingerprint recognition system 300 further includes: the optical element 304, wherein the first reflecting unit 312 and the second reflecting unit 313 are respectively located at two sides of the optical element 304, so that the return light reflected by the reflecting unit 51 is projected onto the second reflecting unit 313 through the optical element 304. The optical element 304 has a light modulating function, and the optical element 304 may also be referred to as a lens, i.e., in this embodiment, as shown in fig. 2 and 3, the return light with fingerprint information formed after being reflected by a finger is irradiated on the first reflecting unit 312, reflected by the first reflecting unit 312, then projected onto the second reflecting unit 313 through the optical element 304, and further reflected by the second reflecting unit 313 onto the optical fingerprint sensor 301, so that the fingerprint image formed by the return light modulated by the optical element 304 is clearer and more complete, and is helpful for improving the accuracy of fingerprint identification.
In this embodiment, the optical element 304 may be a spherical or aspherical optical lens, a diaphragm, a collimation hole layer, etc., which performs functions of focusing, selecting, etc. on the return light passing through the optical element 304, so as to improve the definition and integrity of the generated fingerprint image.
In this embodiment, specifically, the incident surface of the optical element 304 may be disposed towards the first reflecting unit 312, the exit surface of the optical element 304 is disposed towards the second reflecting unit 313, so that the return light reflected by the first reflecting unit 312 enters the optical element 304 from the incident surface, is modulated and then exits from the exit surface to be projected onto the second reflecting unit 313, and the second reflecting unit 313 reflects the modulated return light to the optical fingerprint sensor 301 to generate a fingerprint image.
In this embodiment, the outgoing surface of the optical element 304 may have a transmission unit, where the transmission unit is used to collect and transmit the return light that is projected onto the optical element 304 to the second reflection unit 313. The transmission unit may be an optical transmission structure with a spherical or aspherical surface, and may focus the return light, so as to converge the return light to the second reflection unit 313, which is helpful to increase the probability of the return light entering the optical fingerprint sensor 301, so that the fingerprint image generated according to the return light is more clear and complete, effectively improves the resolution and contrast of the optical fingerprint image, and is helpful to improve the accuracy of fingerprint detection.
The transmission unit may be one lens or a structure composed of a plurality of lenses. The lens of the transmission unit may be generally formed of a resin material or a glass material. The optical axis of the transmissive unit may be perpendicular to the optical axis of the second reflective unit 313, or the optical axis of the transmissive unit may be non-perpendicular, e.g., nearly perpendicular, to the optical axis of the second reflective unit 313. The optical axis of the transmission unit is perpendicular to the optical axis of the second reflection unit 313, so that the return light transmitted by the transmission unit is incident to the second reflection unit 313 as much as possible, thereby avoiding omission of light, further improving the definition and integrity of the fingerprint image, and ensuring the accuracy of fingerprint detection.
Further, in this embodiment, as shown in fig. 5 to 7, the under-screen optical fingerprint recognition system further includes: the virtual key unit 305, the virtual key unit 305 is located on the liquid crystal panel 100, and the virtual key unit 305 corresponds to the position of the extension portion 322. The virtual key unit 305 may be a function menu unit, such as a virtual Home key, a virtual directory key, or a virtual operation key, which is convenient for the user to use the functions, and in addition, since the second reflection unit 313 extends to the extension portion 322 in the display area, as shown in fig. 4, the outline thereof is thin and visible from different angles, so in this embodiment, the virtual key unit 305 corresponds to the position of the extension portion 322, that is, the virtual key unit 305 covers the position of the extension portion 322, so that when the screen of the electronic device 400 is displayed in a highlighting manner, the existence of the extension portion 322 is not visually perceived, and the display of the extension portion 322 is avoided from affecting the user experience. In this embodiment, as shown in fig. 5, 6 and 7, the shape of the virtual key unit 305 may be one or more regular boxes, or may be other graphics, so long as the coverage extension 322 is ensured.
Further, in the present embodiment, the fingerprint detection light source 303 is located at a side of the liquid crystal panel 100 near the non-display area, or the fingerprint detection light source 303 is located between the liquid crystal panel 100 and the backlight module 200, wherein in the present embodiment, the optical fingerprint recognition system 300 further includes: as shown in fig. 2 and 3, the substrate 306, specifically, the substrate 306 is located between the backlight module 200 and the liquid crystal panel 100, the fingerprint detection light source 303, the reflection unit 302, and the optical fingerprint sensor 301 are located on a surface of the substrate facing the liquid crystal panel, and the optical element 304 may also be disposed on the substrate 306, so that the infrared detection light source 303, the reflection unit 302, the optical fingerprint sensor 301, and the optical element 304 may be installed as an integrated module system, which is helpful for improving convenience and reliability of installation of the under-screen optical fingerprint identification system 300.
In this embodiment, the number of the fingerprint detection light sources 303 may be one or more, and when the number of the fingerprint detection light sources 303 is more than one, the fingerprint detection light sources 303 are arranged in a manner of taking the optical fingerprint sensor 301 as the symmetry center, so that the fingerprint detection effect of the finger under the pressing at different angles on the fingerprint detection area can be ensured. In addition, the number of the fingerprint detection light sources 303 is set to be a plurality of, which is helpful to further increase the signal quantity of fingerprint detection and improve the fingerprint identification effect.
Example two
The present embodiment provides an electronic device, including any one of the above-described embodiments, an under-screen optical fingerprint identification system. The electronic equipment can be electronic products or components such as a liquid crystal display device, electronic paper, a mobile phone, a tablet personal computer, a television, a notebook computer, a digital photo frame, a navigator, a fingerprint lock and the like.
The electronic device provided by the embodiment comprises an under-screen optical fingerprint identification system, wherein the under-screen optical fingerprint identification system comprises an optical fingerprint sensor and a reflecting unit, the reflecting unit and the optical fingerprint sensor are arranged between a liquid crystal panel and a backlight module and correspond to a non-display area of the liquid crystal panel, the reflecting unit is used for receiving return light formed by irradiating a finger above a fingerprint detection area with detection light emitted by a fingerprint detection light source and reflecting the return light to the optical fingerprint sensor, the fingerprint detection area is located in the display area of the liquid crystal panel, and the optical fingerprint sensor is used for receiving the return light reflected by the reflecting unit and generating a fingerprint image, so that the detection of the under-screen optical fingerprint is realized. Meanwhile, the extension part is used for extending into the display area, the extension part can enable visible light emitted by the backlight module to penetrate, so that the width of the reflection unit in the non-display area is reduced, the width dimension of the frame of the non-display area of the electronic equipment can be reduced, the extension part can reflect return light, and meanwhile, the extension part can enable the visible light emitted by the backlight module to penetrate, so that the display effect is not affected, namely, the width of the frame is reduced while the display effect is ensured, and the visual experience and the use experience of a user are improved.
Example III
The embodiment provides a fingerprint identification display device, in particular to a device with a fingerprint identification function and capable of being used for image display, the fingerprint identification display device comprises a display module and an optical fingerprint identification module, wherein the display module comprises a liquid crystal panel 100 and a backlight module 200 arranged on the back of the liquid crystal panel 100; the optical fingerprint recognition module includes a fingerprint detection light source 303, a reflection unit 302, and an optical fingerprint sensor 301.
Wherein the reflection unit 302 and the optical fingerprint sensor 301 are disposed between the liquid crystal panel 100 and the backlight module 200 and correspond to a non-display area of the liquid crystal panel 100, the fingerprint detection light source 303 is configured to emit detection light to a fingerprint detection area located in the display area of the liquid crystal panel 100, the detection light is reflected by a finger on the fingerprint detection area to form return light, the return light is irradiated on the reflection unit 302, the reflection unit 302 is configured to reflect the return light to the optical fingerprint sensor 301, and the optical fingerprint sensor 301 is configured to receive the return light and generate a fingerprint image, thereby realizing detection of an optical fingerprint under the screen. Meanwhile, the reflective unit 302 has an extension portion 322 for extending into the display area, and the extension portion 322 can enable visible light emitted by the backlight module 200 to pass through, i.e. a part of the reflective unit 302 is the extension portion 322, and the extension portion 322 extends into the display area, and can be used for reflecting return light, i.e. the extension portion 322 extending into the display area does not affect the transmission of light between the backlight module 200 and the liquid crystal panel 100, and does not affect the display effect, and meanwhile, the extension portion 322 of the reflective unit 302 extends into the display area, so that the width of the reflective unit 302 located in the non-display area is reduced, and the width dimension of the frame of the non-display area of the device is reduced, so that the width of the frame 101 is reduced while the display effect is ensured, the visual perception and the use experience of a user are improved, and the requirement of the narrow frame 101 is met.
In this embodiment, the specific structure and function of the extension portion 322 can be seen in the first embodiment, and will not be described in detail in this embodiment.
In this embodiment, the reflection unit 302 and the optical fingerprint sensor 301 are disposed between the liquid crystal panel 100 and the backlight module 200, and specifically, a portion vertically opposite to the reflection unit 302 and the fingerprint sensor is a portion of the liquid crystal panel 100, or is a portion of the cover plate, or may be other non-display components.
In this embodiment, the reflection unit 302 may have a reflection surface for being disposed toward the liquid crystal panel 100 to receive the return light reflected by the finger on the display area of the liquid crystal panel 100, and at the same time, be disposed toward the photosensitive area of the optical fingerprint sensor 301 to reflect the return light to the optical fingerprint sensor 301.
In this embodiment, the reflection unit 302 may include a plurality of reflection units 302, and the reflection unit 302 may be parallel to the optical fingerprint sensor 301 and the liquid crystal panel 100, the backlight module 200, and the like, and the extension portion 322 may be a portion beyond the optical fingerprint sensor 301 in the horizontal direction.
In this embodiment, the optical fingerprint sensor 301 may be an optical fingerprint sensor in the prior art, and specific components and the like thereof may be referred to the optical fingerprint sensor in the prior art, which is not described in detail in this embodiment.
The fingerprint identification display device provided by the embodiment comprises a display module and an optical fingerprint identification module, wherein the display module comprises a liquid crystal panel 100 and a backlight module 200 arranged on the back of the liquid crystal panel 100; the optical fingerprint recognition module includes a fingerprint detection light source 303, a reflection unit 302, and an optical fingerprint sensor 301. Wherein the reflection unit 302 and the optical fingerprint sensor 301 are located between the liquid crystal panel 100 and the backlight module 200 and correspond to a non-display area of the liquid crystal panel 100, the fingerprint detection light source 303 is configured to emit detection light to a fingerprint detection area located in the display area of the liquid crystal panel 100, the detection light is reflected by a finger on the fingerprint detection area to form return light, the return light irradiates the reflection unit 302, the reflection unit 302 is configured to reflect the return light to the optical fingerprint sensor 301, and the optical fingerprint sensor 301 is configured to receive the return light and generate a fingerprint image, thereby implementing detection of an optical fingerprint under the screen. Meanwhile, the reflection unit 302 is provided with an extension portion 322 extending into the display area, the extension portion 322 can enable visible light emitted by the backlight module 200 to pass through, so that the width of the reflection unit 302 in the non-display area can be reduced, the width of the frame of the non-display area can be reduced, the extension portion 322 can reflect return light, meanwhile, the extension portion 322 can enable visible light emitted by the backlight module 200 to pass through, the display effect is not affected, namely, the display effect is ensured, the width of the frame 101 is reduced, and the visual experience and the use experience of a user are improved.
Further, in this embodiment, the fingerprint detection light source 303 may be an infrared fingerprint detection light source, that is, the detection light emitted by the fingerprint detection light source 303 is infrared light, so that when the emitted detection light irradiates the fingerprint detection area, the detection light is invisible to the user, and compared with the case that the visible light is used as the detection light, the detection area does not generate visible brightness during fingerprint detection, so that brightness generated during each detection can be avoided, and the use experience of the user is reduced.
Further, in the present embodiment, the reflection unit 302 includes: the first reflection unit 312 and the second reflection unit 313, wherein the first reflection unit 312 is located at a side of the optical fingerprint sensor 301 facing the displayed area, the second reflection unit 313 corresponds to a position of the optical fingerprint sensor 301, the first reflection unit 312 is used for reflecting the return light to the second reflection unit 313, the second reflection unit 313 is used for reflecting the return light reflected by the first reflection unit 312 to the optical fingerprint sensor 301, that is, in this embodiment, the return light formed by the reflection of the finger irradiates onto the first reflection unit 312, the first reflection unit 312 reflects the return light to the second reflection unit 313, the second reflection unit 313 receives the return light and reflects the return light to the optical fingerprint sensor 301, and the optical fingerprint sensor 301 can form a fingerprint image according to the return light, so that detection and identification of the optical fingerprint can be realized.
In this embodiment, one end of the first reflecting unit 312 extends into the display area to form the extension portion 322, that is, the first reflecting unit 312 is partially located in the display area, so that the width of the first reflecting unit 312 in the non-display area is reduced, that is, the width of the non-display area frame 101 can be reduced. In addition, compared with a single reflection unit, the reflection unit 302 includes the first reflection unit 312 and the second reflection unit 313, the first reflection unit 312 and the second reflection unit 313 transmit the return light to the second reflection unit 313, and the second reflection unit 313 reflects the return light to the optical fingerprint sensor 301, so that the optical path of the return light is folded, and the distance between the reflection unit 302 and the optical fingerprint sensor 301 can be reduced, thereby effectively reducing the thickness required by the optical fingerprint identification system, reducing the thickness of the device, and further improving the hand feeling and the use experience of the user.
In this embodiment, the length of the extension portion 322 of the first reflection unit 312 located in the display area is 1-2mm, so that the length of the extension portion 322 is 1-2mm, which can reduce the width of the optical fingerprint recognition system as much as possible without affecting the image display performance of the display area, and further reduce the width of the bezel 101.
Further, in this embodiment, the fingerprint identification display device further includes: the optical element 304, wherein the first reflecting unit 312 and the second reflecting unit 313 are respectively located at two sides of the optical element 304, so that the return light reflected by the first reflecting unit 312 is projected onto the second reflecting unit 313 through the optical element 304. The optical element 304 has the function of light modulation, that is, in this embodiment, the return light with fingerprint information formed after the reflection of the finger irradiates the first reflecting unit 312, is reflected by the first reflecting unit 312, then is projected onto the second reflecting unit 313 through the optical element 304, and is further reflected onto the optical fingerprint sensor 301 by the second reflecting unit 313, so that the fingerprint image formed by the return light modulated by the optical element 304 can be more clear and complete, which is helpful for improving the accuracy of fingerprint identification.
The type and arrangement of the optical element 304 can be referred to in the first embodiment, which will not be described in detail herein, wherein in the present embodiment, the incident surface of the optical element 304 is disposed towards the first reflecting unit 312, the exit surface of the optical element 304 is disposed towards the second reflecting unit 313, so that the return light reflected by the first reflecting unit 312 enters the optical element 304 from the incident surface, and is emitted from the exit surface and projected onto the second reflecting unit 313, and the second reflecting unit 313 reflects the return light to the optical fingerprint sensor 301 to generate a fingerprint image.
In this embodiment, the outgoing surface of the optical element 304 has a transmission unit, and the transmission unit is used to collect and transmit the return light that is projected onto the optical element 304 to the second reflection unit 313. The transmission unit may be an optical transmission structure with a spherical or aspherical surface, and may focus the return light, so as to converge the return light to the second reflection unit 313, which is helpful to increase the probability of the return light entering the optical fingerprint sensor 301, so that the fingerprint image generated according to the return light is more clear and complete, effectively improves the resolution and contrast of the optical fingerprint image, and is helpful to improve the accuracy of fingerprint detection.
In this embodiment, the specific structure of the transmission unit and the arrangement manner of the transmission unit can be referred to in the first embodiment, and will not be described in detail in this embodiment.
Further, in this embodiment, the fingerprint identification display device further includes: the virtual key unit 305, the virtual key unit 305 is located on the liquid crystal panel 100, and the virtual key unit 305 corresponds to the position of the extension portion 322. The pseudo-key unit may be a function menu unit, such as a virtual Home key, a virtual directory key, or a virtual operation key, which is convenient for the user to use the functions, and in addition, since the second reflection unit 313 extends to the extension portion 322 in the display area, its outline is thin and visible from different angles, in this embodiment, the virtual key unit 305 is made to correspond to the position of the extension portion 322, that is, the virtual key unit 305 is covered on the position of the extension portion 322, so that when the screen is highlighted, the existence of the extension portion 322 is not visually perceived, and the display of the extension portion 322 is avoided from affecting the user experience. The specific arrangement and shape of the virtual key may be referred to in the first embodiment, and will not be described in detail in this embodiment.
Further, in the present embodiment, the fingerprint detection light source 303 may be located at a side of the liquid crystal panel 100 near the non-display area, or the fingerprint detection light source 303 may be located between the liquid crystal panel 100 and the backlight module 200. In this embodiment, the optical fingerprint recognition system 300 further includes: the substrate 306, specifically, the substrate 306 is located between the backlight module 200 and the liquid crystal panel 100, the fingerprint detection light source 303, the reflection unit 302, and the optical fingerprint sensor 301 are located on a surface of the substrate facing the liquid crystal panel, and the optical element 304 may also be disposed on the substrate 306, so that the infrared detection light source 303, the reflection unit 302, the optical fingerprint sensor 301, and the optical element 304 may be installed as an integrated module system, which is helpful for improving convenience and reliability of the installation of the optical fingerprint identification system 300 under the screen.
In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, indirectly connected through an intermediary, or may be in communication with each other between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. In the description of the present application, the meaning of "a plurality" is two or more, unless specifically stated otherwise.
The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (20)

1. An under-screen optical fingerprint identification system applied to an electronic device with a backlight module and a liquid crystal panel is characterized by comprising: the optical fingerprint sensor and the reflecting unit are reflectors;
the reflection unit is used for receiving return light formed by the fact that the detection light emitted by the fingerprint detection light source irradiates the finger above the fingerprint detection area and reflecting the return light to the optical fingerprint sensor, and the fingerprint detection area is located in the display area of the liquid crystal panel;
the optical fingerprint sensor is used for receiving the return light reflected by the reflecting unit and generating a fingerprint image;
The reflection unit and the optical fingerprint sensor are arranged between the liquid crystal panel and the backlight module and correspond to a non-display area of the liquid crystal panel, the reflection unit is provided with an extension part which is used for extending into the display area, and the extension part can enable visible light emitted by the backlight module to pass through;
the reflection unit includes: a first reflection unit for reflecting the return light to the second reflection unit and a second reflection unit for reflecting the return light reflected by the first reflection unit to the optical fingerprint sensor;
the first reflecting unit is positioned at one side of the optical fingerprint sensor facing the display area, the second reflecting unit corresponds to the position of the optical fingerprint sensor, and one end of the first reflecting unit extends into the display area to form the extension part.
2. The under-screen optical fingerprint recognition system of claim 1, further comprising: the fingerprint detection light source is used for emitting the detection light to a fingerprint detection area positioned in a display area of the liquid crystal panel so as to reflect the finger to form the return light.
3. An under-screen optical fingerprint recognition system according to claim 2, wherein the length of the extension of the first reflection unit located in the display area is 1-2mm.
4. An under-screen optical fingerprint recognition system according to claim 3, further comprising: the first reflecting unit and the second reflecting unit are respectively positioned at two sides of the optical element, so that the return light reflected by the first reflecting unit is projected onto the second reflecting unit through the optical element.
5. The under-screen optical fingerprint recognition system of claim 4, wherein an incident surface of the optical element is disposed toward the first reflecting unit, and an exit surface of the optical element is disposed toward the second reflecting unit, such that the return light reflected by the first reflecting unit enters the optical element from the incident surface and exits from the exit surface to be projected to the second reflecting unit, the second reflecting unit reflecting the return light to the optical fingerprint sensor.
6. An off-screen optical fingerprint recognition system according to claim 4, wherein the exit face of the optical element has a transmission unit for converging and projecting the return light projected onto the optical element to the second reflection unit.
7. The under-screen optical fingerprint recognition system of claim 1, further comprising: the virtual key unit is positioned on the liquid crystal panel, and corresponds to the position of the extension part, so that the influence of the extension part on the display of the liquid crystal panel is reduced or eliminated.
8. The system of claim 2, wherein the fingerprint detection light source is located at a side of the liquid crystal panel near the non-display area, or the fingerprint detection light source is located between the liquid crystal panel and the backlight module.
9. The system of claim 8, further comprising a substrate positioned between the backlight module and the liquid crystal panel, wherein the fingerprint detection light source, the reflection unit, and the optical fingerprint sensor are all positioned on a side of the substrate facing the liquid crystal panel.
10. The under-screen optical fingerprint recognition system of claim 9, wherein the fingerprint detection light source is an infrared fingerprint detection light source.
11. An electronic device comprising an off-screen optical fingerprint recognition system according to any one of claims 1-10.
12. The fingerprint identification display device is characterized by comprising a display module and an optical fingerprint identification module, wherein the display module comprises a liquid crystal panel and a backlight module arranged on the back of the liquid crystal panel; the optical fingerprint identification module comprises a fingerprint detection light source, a reflection unit and an optical fingerprint sensor, wherein the reflection unit is a reflecting mirror;
the fingerprint detection light source is used for emitting detection light to a fingerprint detection area positioned in the liquid crystal panel display area, the detection light is reflected by a finger on the fingerprint detection area to form return light, the reflection unit is used for receiving the return light and reflecting the return light to the optical fingerprint sensor, and the optical fingerprint sensor is used for receiving the return light and generating a fingerprint image; the reflection unit and the optical fingerprint sensor are arranged between the liquid crystal panel and the backlight module and correspond to a non-display area of the liquid crystal panel, the reflection unit is provided with an extension part which is used for extending into the display area, and the extension part can enable visible light emitted by the backlight module to pass through;
the reflection unit includes: a first reflection unit for reflecting the return light to the second reflection unit and a second reflection unit for reflecting the return light reflected by the first reflection unit to the optical fingerprint sensor;
The first reflecting unit is positioned at one side of the optical fingerprint sensor facing the display area, the second reflecting unit corresponds to the position of the optical fingerprint sensor, and one end of the first reflecting unit extends into the display area to form the extension part.
13. The fingerprint recognition display device of claim 12, wherein the length of the extension of the first reflection unit located in the display area is 1-2mm.
14. The fingerprint identification display device of claim 13, further comprising: the first reflecting unit and the second reflecting unit are respectively positioned at two sides of the optical element, so that the return light reflected by the first reflecting unit is projected onto the second reflecting unit through the optical element.
15. The fingerprint recognition display device according to claim 14, wherein an incident surface of the optical element is disposed toward the first reflection unit, an exit surface of the optical element is disposed toward the second reflection unit, so that the return light reflected by the first reflection unit enters the optical element from the incident surface and exits from the exit surface to be projected to the second reflection unit, the second reflection unit reflecting the return light to the optical fingerprint sensor.
16. The fingerprint recognition display device of claim 14, wherein the optical element has a transmission unit on an exit surface thereof for converging and projecting the return light projected onto the optical element to the second reflection unit.
17. The fingerprint identification display device of claim 12, further comprising: the virtual key unit is positioned on the liquid crystal panel, and corresponds to the position of the extension part, so that the influence of the extension part on the display of the liquid crystal panel is reduced or eliminated.
18. The fingerprint recognition display device of claim 12, wherein the fingerprint detection light source is located at a side of the liquid crystal panel near the non-display area, or the fingerprint detection light source is located between the liquid crystal panel and the backlight module.
19. The fingerprint recognition display device of claim 18, further comprising a substrate positioned between the backlight module and the liquid crystal panel, wherein the fingerprint detection light source, the reflection unit, and the optical fingerprint sensor are all positioned on a side of the substrate facing the liquid crystal panel.
20. The fingerprint identification display device of claim 19, wherein the fingerprint detection light source is an infrared fingerprint detection light source.
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