CN111095290A - Optical fingerprint identification device under screen, system, reflective film and liquid crystal display screen - Google Patents
Optical fingerprint identification device under screen, system, reflective film and liquid crystal display screen Download PDFInfo
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- CN111095290A CN111095290A CN201980004397.2A CN201980004397A CN111095290A CN 111095290 A CN111095290 A CN 111095290A CN 201980004397 A CN201980004397 A CN 201980004397A CN 111095290 A CN111095290 A CN 111095290A
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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
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- 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
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Abstract
The application provides an optical fingerprint identification device under a screen, a system, a reflective film and a liquid crystal display screen, wherein the optical fingerprint identification device under the screen is suitable for the liquid crystal display screen with a backlight module; wherein, infrared fingerprint detects the light when transmitting backlight unit's light guide plate and reflectance coating, through the interval effect of reflectance coating towards the supporting layer on light guide plate surface to reduce the interference line that infrared fingerprint detected the light and formed between light guide plate and reflectance coating.
Description
Technical Field
The application relates to the technical field of biological identification, in particular to an optical fingerprint identification device and system under a screen, a reflective film and a liquid crystal display screen.
Background
With the advent of the full screen age of electronic devices such as mobile phones, the application of the fingerprint under the screen (also called light-sensitive screen fingerprint identification) technology is more and more extensive, and the optical fingerprint under the screen is the most popular.
A Liquid Crystal Display (LCD) includes a panel and a backlight module. The backlight module is provided with a light guide plate and a reflecting film. When fingerprint identification is carried out, the infrared light emitter can emit an infrared light signal, the signal can penetrate through the panel and is reflected/scattered or transmitted by a finger to form an infrared light signal (namely fingerprint detection light) carrying fingerprint information, and the infrared light signal penetrates through the panel, the light guide plate and the reflection film to be transmitted to the sensor, so that the sensor collects the fingerprint signal and carries out fingerprint identification.
However, the light guide plate and the reflective film are easily deformed by pressure, and the light guide plate and the reflective film are not uniformly contacted with each other, and a newton ring or an interference pattern interfering with fingerprint imaging is easily generated, thereby affecting fingerprint recognition.
Disclosure of Invention
The application provides an optical fingerprint identification device and system, reflectance coating and liquid crystal display under screen, and it is inhomogeneous to have solved the contact of light guide plate and reflectance coating among the prior art, produces the Newton's ring or the interference line that disturb the fingerprint formation of image easily to the influence carries out fingerprint identification's problem.
The embodiment of the application provides an optical fingerprint identification device under a screen, which is suitable for a liquid crystal display screen with a backlight module, wherein a fingerprint identification area of the optical fingerprint identification device under the screen is positioned in a display area of the liquid crystal display screen;
the optical fingerprint sensor comprises an optical sensing array with a plurality of sensing units, wherein the optical sensing array is used for receiving infrared fingerprint detection light which is formed by a finger above the liquid crystal display screen and passes through the liquid crystal display screen, and detecting fingerprint information of the finger according to the infrared fingerprint detection light;
the light path guide structure is arranged below a backlight module of the liquid crystal display screen and used for guiding the infrared fingerprint detection light to the optical fingerprint sensor;
wherein, infrared fingerprint detects the light when transmitting backlight unit's light guide plate and reflectance coating, through the interval effect of reflectance coating towards the supporting layer on light guide plate surface to reduce the interference line that infrared fingerprint detected the light and formed between light guide plate and reflectance coating.
In a specific embodiment of the present application, the liquid crystal display device further includes an infrared light source, where the infrared light source is configured to emit infrared light to the fingerprint identification area of the liquid crystal display device, so that the finger above the fingerprint identification area of the liquid crystal display device forms infrared fingerprint detection light.
The application provides an optical fingerprint identification system for a liquid crystal display screen, which comprises the liquid crystal display screen and the optical fingerprint identification device under the liquid crystal display screen, wherein the optical fingerprint identification device under the liquid crystal display screen is arranged below the liquid crystal display screen and used for detecting fingerprint information of a finger above the liquid crystal display screen;
the liquid crystal display screen comprises a liquid crystal panel and a backlight module, and the backlight module is arranged below the liquid crystal panel;
the backlight module is used for providing a backlight source for the liquid crystal panel and transmitting infrared fingerprint detection light formed by fingers above the liquid crystal display screen to the optical fingerprint identification device below the backlight module;
backlight unit is including the light guide plate and the reflectance coating that range upon range of setting, and the reflectance coating is towards optical fingerprint identification device under the screen, and the light guide plate is towards liquid crystal display panel, and the reflectance coating has the supporting layer towards the surface of light guide plate, and the supporting layer is used for interval light guide plate and reflectance coating.
In a specific embodiment of the present application, specifically, the supporting layer includes a plurality of first supporting portions arranged at intervals.
In the specific implementation manner of the present application, specifically, one surface of the first supporting portion facing the light guide plate is an arc surface.
In the specific embodiment of this application, specifically, the distance scope between the one side of first supporting part orientation light guide plate and the one side of first supporting part orientation reflectance coating is 1um ~ 3 um.
In a specific embodiment of the present application, specifically, the light guide plate has a plurality of irregularly distributed second supporting portions, and the second supporting portions are located on a surface of the light guide plate facing the reflective film.
In a specific embodiment of the present application, specifically, a distance between two opposite sides of the first supporting portion is greater than or equal to a maximum distance between the second supporting portions.
In a specific embodiment of the present application, specifically, a distance between two adjacent first supporting portions is less than or equal to a minimum distance between the second supporting portions.
In the specific embodiment of this application, specifically, the distance range between the relative both sides of first supporting part is 130um ~ 250 um.
In the specific embodiment of this application, specifically, the distance range between two adjacent first supporting parts centers is 180um ~ 300 um.
In a specific embodiment of the present application, specifically, the plurality of first supporting portions are regularly arranged.
In the embodiment of this application, it is concrete, still include the stiffening plate, the stiffening plate is located the reflectance coating and towards the surface of fingerprint identification module, has the light trap on the stiffening plate.
In a specific embodiment of the present application, a projection of each first supporting portion on the reinforcing plate covers the light-transmitting hole.
In the specific implementation of this application, it is concrete, backlight unit still includes the membrane of evening light, and the membrane of evening light covers on the one side that the light guide plate deviates from the reflectance coating.
In a specific embodiment of the present application, specifically, the backlight module further includes a brightness enhancement film, and the brightness enhancement film is covered on a surface of the light-equalizing film, which faces away from the light guide plate.
The application provides a reflectance coating, be applicable to the liquid crystal display who supports fingerprint identification function under the screen, the reflectance coating includes the substrate layer of light-permeable and the supporting layer that sets up in the one side of substrate layer, the supporting layer is used for the interval to cover the light guide plate in the reflectance coating top, reduce the interference line that infrared fingerprint detected the light and formed between light guide plate and reflectance coating, make the infrared fingerprint that the finger in the liquid crystal display top formed detect the light and transmit optical fingerprint identification device under the screen to the liquid crystal display below through the reflectance coating.
In a specific embodiment of the present application, specifically, the supporting layer includes a plurality of first supporting portions arranged at intervals.
In the specific embodiment of this application, specifically, the distance scope between the one side of first supporting part orientation light guide plate and the one side of first supporting part orientation reflectance coating is 1um ~ 3 um.
In the specific embodiment of this application, specifically, the distance range between the relative both sides of first supporting part is 130um ~ 250 um.
In the specific embodiment of this application, specifically, the distance range between two adjacent first supporting parts centers is 180um ~ 300 um.
In a specific embodiment of the present application, specifically, the plurality of first supporting portions are regularly arranged.
The application also provides a liquid crystal display screen supporting the fingerprint identification function under the screen, which comprises a liquid crystal panel and a backlight module, wherein the backlight module is arranged below the liquid crystal panel;
the backlight module is used for providing a backlight source for the liquid crystal panel and transmitting infrared fingerprint detection light formed by fingers above the liquid crystal display screen to the optical fingerprint identification device below the backlight module; the backlight module comprises the reflecting film.
The embodiment of the application provides an optical fingerprint identification device and system under screen, reflectance coating and liquid crystal display, in the optical fingerprint identification device under the screen, infrared fingerprint detects the light when transmitting backlight unit's light guide plate and reflectance coating, through the interval effect of the supporting layer of reflectance coating orientation light guide plate surface, reduces the interference line that infrared fingerprint detected the light and formed between light guide plate and reflectance coating. That is, in the embodiment of the present application, the supporting layer is disposed on the reflective film of the backlight module, wherein the supporting layer is located on the surface of the reflective film facing the light guide plate. The supporting layer increases the clearance between light guide plate and the reflectance coating, has reduced the adsorption degree between light guide plate and the reflectance coating, has reduced the width and the interval of interference line, and interference line route width attenuation this moment disturbs the interval of line and changes the density by density to destroy interference line formation condition. The problem of among the prior art light guide plate and reflective film's contact inhomogeneous, produce the Newton's ring or the interference line that disturb the fingerprint formation of image easily to influence and carry out fingerprint identification is solved. Meanwhile, the supporting layer is arranged on the reflecting film, so that the roughness of the surface of the reflecting film is increased, the haze of the reflecting film is increased, interference grains are shielded, and the contrast of the interference grains is favorably reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an optical fingerprint identification device under a screen according to an embodiment of the present application;
FIG. 2 is a schematic diagram of the transmission of infrared light on a light guide plate and a reflective film according to the prior art;
FIG. 3 is a schematic structural diagram of a conventional infrared light source that generates interference patterns when passing through a light guide plate and a reflective film;
fig. 4 is a schematic structural diagram of an off-screen optical fingerprint identification device according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a backlight module in the optical fingerprint identification device under a screen according to the embodiment of the present application;
fig. 6 is a schematic view of a partial structure of a light guide plate, a reflective film, and a reinforcing plate in a backlight module in an optical fingerprint identification device under a screen according to an embodiment of the present disclosure;
fig. 7 is a schematic view of an embedded structure of a first supporting portion and a second supporting portion in a backlight module of an optical fingerprint identification device under a screen according to an embodiment of the present application;
fig. 8 is a diagram of a first arrangement of a first supporting portion of a backlight module of an optical fingerprint identification device under a screen according to an embodiment of the present disclosure;
fig. 9 is a diagram of a second arrangement of the first supporting portion of the backlight module of the optical fingerprint identification device under the screen according to the embodiment of the present application;
fig. 10 is a schematic structural diagram of a reflective film according to an embodiment of the present application.
Description of reference numerals:
100-an underscreen optical fingerprint recognition device; 101-a fingerprint identification module; 1011-an optical fingerprint sensor; 1012-optical path guiding structure; 102-an infrared light source; 1021-infrared fingerprint detection light; 200-a liquid crystal display screen; 201-liquid crystal panel; 202-a backlight module; 2021-a light guide plate; 20211-a second support; 2022-reflective film; 20221-a support layer; 20222-a first support; 20223-a substrate layer; 2023-stiffener plate; 20231-light transmission hole; 2024-a light homogenizing film; 2025-brightness enhancing film; 2026-circuit board; 203-transparent protective cover plate; 300-finger; 400-Newton's ring.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
Fig. 1 is a schematic structural diagram of an off-screen optical fingerprint identification device suitable for a liquid crystal display screen according to an embodiment of the present application. Referring to fig. 1 and 10, an embodiment of the present application provides an off-screen optical fingerprint identification device, where the off-screen optical fingerprint identification device 100 may be applied to a smart phone, a tablet computer, and other mobile terminals or electronic devices that employ a liquid crystal display. In the above-mentioned mobile terminal or electronic device, the off-screen optical fingerprint recognition apparatus 100 may be disposed in a partial region below the liquid crystal display 200, and cooperate with the liquid crystal display 200 to form a liquid crystal display optical fingerprint recognition system. Wherein the fingerprint identification area (or fingerprint detection area) of the off-screen optical fingerprint identification device 100 may be located in at least a portion of the display area of the liquid crystal display panel 200.
The optical fingerprint identification device 100 is suitable for the liquid crystal display screen 200 with the backlight module 202. The lcd 200 includes a liquid crystal panel 201 and a backlight module 202 disposed below the liquid crystal panel 201, and the backlight module 202 is configured to provide a backlight source for the liquid crystal panel 201. The backlight source is a uniform surface light source using visible light, so that the liquid crystal panel 201 displays a picture for a user to watch. The off-screen optical fingerprint identification device 100 is arranged below the liquid crystal display screen 200, and may specifically refer to that main functional components of the off-screen optical fingerprint identification device are arranged below the liquid crystal panel 201 or the backlight module 202; in the present embodiment, as shown in fig. 6, the main functional components (such as the fingerprint recognition module 101) of the off-screen optical fingerprint recognition device 100 are disposed below the backlight module 202.
Wherein, optical fingerprint identification device 100 includes fingerprint identification module 101 under the screen, and fingerprint identification module 101 includes optical fingerprint sensor 1011 and light path guide structure 1012, and light path guide structure 1012 is used for detecting light guide to optical fingerprint sensor 1011 with infrared fingerprint. The optical fingerprint sensor 1011 includes an optical sensing array having a plurality of sensing units, and a reading circuit and other auxiliary circuits electrically connected to the optical sensing array. The sensing area of the optical sensing array may correspond to a fingerprint recognition area of the optical fingerprint sensor 1011.
The optical fingerprint sensor 1011 may be located below the fingerprint identification area of the liquid crystal display 200, or may be located in another area (for example, the edge area of the liquid crystal display 200); and, fingerprint identification module 101 can guide the fingerprint detection light in fingerprint identification area to optical fingerprint sensor 1011 through light path guide structure 1012 to make the optical induction array can receive the fingerprint detection light, with the fingerprint information that the detection obtained the finger corresponding with fingerprint detection light.
Because the fingerprint identification area of optical fingerprint identification device 100 is located in the display area of liquid crystal display 200 under the screen, when the user needs to unlock or other fingerprint verification the mobile terminal or electronic equipment that adopts optical fingerprint identification device 100 under the screen, only need press user's finger 300 in the fingerprint identification area that is located this liquid crystal display 200 alright realize fingerprint input, consequently, the display area of this liquid crystal display 200 can expand the front of whole mobile terminal or electronic equipment basically, satisfy the comprehensive screen demand that high screen accounts for the ratio.
The fingerprint recognition module 101 may further include other optical components, and the other optical components may be a Filter layer (Filter), and the Filter layer may be disposed between the optical path guiding structure 1012 and the optical fingerprint sensor 1011, and the Filter layer is used for filtering the interference light passing through the optical path guiding structure 1012, so as to prevent the interference light from being received by the optical sensor array and affecting the fingerprint recognition performance. The optical fingerprint sensor 1011, the optical path guiding structure 1012 and the filter layer can be packaged in the same optical component to form the fingerprint identification module 101.
In a specific implementation, the liquid crystal display panel 200 further includes a transparent protective cover 203, such as a glass cover or a sapphire cover, where the transparent protective cover 203 is located above the liquid crystal panel 201 of the liquid crystal display panel 200 and covers the front surface of the liquid crystal panel 201. Therefore, in the embodiment of the present application, the pressing of the finger 300 on the liquid crystal display 200 may specifically refer to pressing the transparent protective cover 203 above the liquid crystal panel 201 or a protective layer (such as a tempered film or other protective film) covering the surface of the transparent protective cover 203.
To avoid the mutual influence between the fingerprint detection light and the backlight source provided by the backlight module 202. In this embodiment, the optical fingerprint identification device 100 under the screen may use the invisible light source with a specific wavelength as the fingerprint excitation light source to realize the optical fingerprint identification. Taking infrared light as an example, specifically, the off-screen optical fingerprint identification apparatus 100 may further include an infrared light source 102, where the infrared light source 102 may be an infrared LED light source, an infrared Vertical Cavity Surface Emitting Laser (VCSEL), or an infrared Laser Diode (Laser Diode).
The infrared light source 102 may be disposed below an edge region of the liquid crystal panel 201, or the infrared light source 102 may be disposed on a side surface of the liquid crystal panel 201 and below the transparent protective cover 203 along with the liquid crystal panel 201.
The infrared light emitted from the infrared light source 102 may be used as the fingerprint excitation light, and the infrared light may be irradiated to the finger 300 above the fingerprint identification area of the liquid crystal display panel 200 through the liquid crystal panel 201 or the transparent protective cover 203. The infrared light may be reflected from the surface of the finger 300 or transmitted from the surface of the finger 300 to form infrared fingerprint detection light 1021. Therefore, the infrared fingerprint detection light 1021 carries the fingerprint information of the finger 300, and the infrared fingerprint detection light 1021 can further pass through the liquid crystal panel 201 and the backlight module 202 of the liquid crystal display screen 200 and transmit the fingerprint identification module 101 below the backlight module 202. Fingerprint identification module 101 detects light 1021 through light path guide structure 1012 with infrared fingerprint and guides the optical sensing array to optical fingerprint sensor 1011, and optical sensing array can receive infrared fingerprint and detect light 1021 and further detect the fingerprint information that finger 300 was detected to light 1021 according to indicating infrared fingerprint.
In a specific implementation, the backlight module 202 of the lcd panel 200 may include a plurality of backlight assemblies, for example, the backlight module 202 may include a light guide plate 2021 and a reflective film 2022 stacked together, the light guide plate 2021 faces the lcd panel 201, and the reflective film 2022 faces the fingerprint recognition module 101. Among them, the light guide plate 2021 is mainly used to guide a visible light source provided from a backlight to the liquid crystal display panel 200. The reflective film 2022 totally reflects the visible light toward above the liquid crystal display panel 200. The backlight module 202 may further include a circuit board 2026, the liquid crystal panel 201 is connected to the controller through the circuit board 2026, and the circuit board 2026 is disposed at a side edge of the liquid crystal panel 201, and the area is usually covered by the covering region to avoid the circuit board 2026 from leaking.
FIG. 2 is a schematic diagram of the transmission of infrared light between a light guide plate and a reflective film according to the prior art; fig. 3 is a schematic structural diagram of a conventional infrared light that passes through a light guide plate and a reflective film to generate interference patterns. Referring to fig. 2, the light guide plate 2021 and the reflective film 2022 may be made of a Polyester (PET) material. The thickness of the light guide plate 2021 is 400um to 500um, the thickness of the reflective film 2022 is 70um to 90um, the thicknesses of the light guide plate 2021 and the reflective film 2022 are relatively thin, the light guide plate 2021 and the reflective film 2022 are relatively easy to adsorb and deform, and the light guide plate 2021 and the reflective film 2022 are easily deformed to cause uneven contact. Thus, under the condition that the interference pattern or newton's ring 400 (thin film interference) shown in fig. 3 is generated, the infrared fingerprint detection light 1021 passes through the light guide plate 2021 and the reflection film 2022, and then the interference pattern for interference fingerprint recognition can be displayed on the optical fingerprint sensor 1011.
Based on the above reasons, in the optical fingerprint identification device 100 under the screen provided in the embodiment of the present application, when the infrared fingerprint detection light 1021 is transmitted to the light guide plate 2021 and the reflective film 2022 of the backlight module 202, the interference pattern formed by the infrared fingerprint detection light 1021 between the light guide plate 2021 and the reflective film 2022 is reduced by the spacing effect of the reflective film 2022 facing the supporting layer 20221 on the surface of the light guide plate 2021. That is, in the embodiment of the present application, the supporting layer 20221 is disposed on the reflective film 2022 of the backlight module 202, wherein the supporting layer 20221 is located on the surface of the reflective film 2022 facing the light guide plate 2021. The supporting layer 20221 increases the gap between the light guide plate 2021 and the reflective film 2022, reduces the degree of adsorption between the light guide plate 2021 and the reflective film 2022, and reduces the width and the distance of the interference pattern, at this time, the width of the interference pattern route becomes narrow, and the distance of the interference pattern changes from sparse to dense, thereby destroying the formation condition of the interference pattern. The problem of among the prior art light guide plate 2021 and reflective film 2022 contact inhomogeneous, produce the Newton's ring or the interference line that disturb the fingerprint formation of image easily to influence and carry out fingerprint identification is solved. Meanwhile, the supporting layer 20221 is arranged on the reflecting film 2022, and the roughness of the surface of the reflecting film 2022 is increased by the supporting layer 20221, so that the haze of the reflecting film 2022 is increased, interference grains are shielded, and the contrast of the interference grains is favorably reduced.
Example two
Fig. 4 is a schematic structural diagram of an off-screen optical fingerprint identification device according to an embodiment of the present application; fig. 5 is a schematic structural diagram of a backlight module in the optical fingerprint identification device under a screen according to the embodiment of the present application; fig. 6 is a schematic view of a partial structure of a light guide plate, a reflective film and a reinforcing plate in a backlight module in an optical fingerprint identification device under a screen according to an embodiment of the present application. Referring to fig. 4 to 6, an optical fingerprint identification system for a liquid crystal display according to an embodiment of the present application includes a liquid crystal display 200 and an optical fingerprint identification device 100 under the liquid crystal display 100 according to any of the above embodiments, where the optical fingerprint identification device 100 under the liquid crystal display 200 is configured to detect fingerprint information of a finger above the liquid crystal display 200.
Specifically, the liquid crystal display screen 200 includes a liquid crystal panel 201 and a backlight module 202, and the backlight module 202 is disposed below the liquid crystal panel 201; the backlight module 202 is used for providing a backlight source for the liquid crystal panel 201, and transmits the infrared fingerprint detection light 1021 formed by the finger 300 above the liquid crystal display screen 200 to the optical fingerprint identification device 100 below the backlight module 202. That is, in this embodiment, the backlight module 202 can transmit the infrared fingerprint detection light 1021 to the fingerprint identification module 101 of the optical fingerprint identification device 100 under the screen.
In this embodiment, in order to realize that backlight unit 202 detects light 1021 with infrared fingerprint and transmits the purpose to fingerprint identification module 101. Specifically, the backlight module 202 includes a light guide plate 2021 and a reflective film 2022, which are stacked, the reflective film 2022 faces the under-screen optical fingerprint identification apparatus 100, the light guide plate 2021 faces the liquid crystal panel 201, the surface of the reflective film 2022 facing the light guide plate 2021 is provided with a supporting layer 20221, and the supporting layer 20221 is used for spacing the light guide plate 2021 and the reflective film 2022. Among them, the light guide plate 2021 is mainly used to guide a visible light source provided from a backlight to the liquid crystal display panel 200. The reflective film 2022 totally reflects the visible light toward above the liquid crystal display panel 200.
In the embodiment of the present application, a supporting layer 20221 is disposed on the reflective film 2022 of the backlight module 202, wherein the supporting layer 20221 is located on the surface of the reflective film 2022 facing the light guide plate 2021. The supporting layer 20221 increases the gap between the light guide plate 2021 and the reflective film 2022, reduces the degree of adsorption between the light guide plate 2021 and the reflective film 2022, and reduces the width and the distance of the interference pattern, at this time, the width of the interference pattern route becomes narrow, and the distance of the interference pattern changes from sparse to dense, thereby destroying the formation condition of the interference pattern. The problem of among the prior art light guide plate 2021 and reflective film 2022 contact inhomogeneous, produce the Newton's ring or the interference line that disturb the fingerprint formation of image easily to influence and carry out fingerprint identification is solved. Meanwhile, the supporting layer 20221 is arranged on the reflecting film 2022, and the roughness of the surface of the reflecting film 2022 is increased by the supporting layer 20221, so that the haze of the reflecting film 2022 is increased, interference grains are shielded, and the contrast of the interference grains is favorably reduced.
In a specific implementation, the supporting layer 20221 includes a plurality of first supporting portions 20222 disposed at intervals. The first supporting portions 20222 may be disposed at intervals and uniformly, and the first supporting portions 20222 may be disposed at intervals and irregularly. The first support portions 20222 are not limited as long as they function to space the light guide plate 2021 and the reflective film 2022. In this embodiment, each of the first supporting portions 20222 may be disposed on the reflective film 2022 by screen printing, roller printing, spraying or coating, that is, each of the first supporting portions 20222 may be disposed on the reflective film 2022 by screen printing, roller printing, spraying or coating, so as to form the supporting layer 20221, which can reduce the cost without redesigning the reflective film 2022. The material of the support layer 20221 may be the same as that of the reflective film 2022.
In particular, in order to facilitate processing of the first support portions 20222, the shape of each first support portion 20222 may be the same. For example, each of the first support portions 20222 may be a rectangular body, a triangular prism, a triangular pyramid, a circular truncated cone, a spherical surface, or the like. Optionally, a surface of the first supporting portion 20222 facing the light guide plate 2021 is an arc surface.
The increase of the height of the first supporting portion 20222 is beneficial to increase the gap between the reflective film 2022 and the light guide plate 2021, so that the period of the interference loop becomes dense and even disappears. But the height of the first support 20222 is too high and there is a loss in the LCD display brightness. Therefore, in the present embodiment, the height of the first supporting portion 20222 ranges from 1um to 3um, i.e., the thickness of the first supporting portion 20222 ranges from 1um to 3 um. That is, the distance between the surface of the first support section 20222 facing the light guide plate 2021 and the surface of the first support section 20222 facing the reflective film 2022 is in the range of 1um to 3 um. Optionally, each first support portion 20222um has a height of 2.1 um.
In a specific implementation, in order to increase the light guiding effect of the light guiding plate 2021, the light guiding plate 2021 has a plurality of second supporting portions 20211 irregularly distributed thereon, and the second supporting portions 20211 are located on the surface of the light guiding plate 2021 facing the reflective film 2022. The surface of the light guide plate 2021 facing away from the reflective film 2022 may also be provided with a second supporting portion 20211, and the shapes of the second supporting portions 20211 on the opposite surface of the light guide plate 2021 may be the same or different. The present embodiment is not limited herein. The shape of the second support portion 20211 of the surface of the light guide plate 2021 facing the reflective film 2022 may be hemispherical. The second support portion 20211 of the light guide plate 2021 facing the surface of the reflective film 2022 may also be referred to as a dot.
Fig. 7 is a schematic view of an embedded structure of a first supporting portion and a second supporting portion in a backlight module of an optical fingerprint identification device under a screen according to an embodiment of the present application. Referring to fig. 4 to 7, in the present application, a distance between two opposite sides of the first supporting portion 20222 is greater than or equal to a maximum distance between the second supporting portions 20211, i.e., Pmax in fig. 6. Here, a distance between opposite sides of the first support portion 20222 may be referred to as a width of the first support portion 20222, i.e., a width W of the first support portion 20222 in fig. 6.
Further, the distance between two adjacent first supporting portions 20222 is less than or equal to the minimum distance 20211 between the second supporting portions, i.e., Pmin in fig. 6. Here, a distance between two adjacent first support portions 20222 is denoted by X in fig. 6. The distance between two adjacent first support portions 20222 is P in fig. 6, where P is W + X.
Since each second support portion 20211 is irregularly distributed, that is, adjacent two second support portions 20211 are different from each other, as long as the distance between opposite sides of the first support portion 20222 is greater than or equal to the maximum distance between each adjacent second support portions 20211, the distance between adjacent two first support portions 20222 is less than or equal to the minimum distance 20211 between each second support portion. It can ensure that the first supporting portion 20222 can better eliminate the interference patterns, increase the height between the reflective film 2022 and the dots of the light guide plate 2021, and prevent the first supporting portion 20222 of the reflective film 2022 from being embedded with the dots of the light guide plate 2021 (as shown in fig. 7).
Usually, the dots of the light guide plate 2021 close to the backlight are sparse, the maximum spacing between the dots is 130um to 200um, and the minimum spacing between the dots is about 50um to 100 um. Therefore, in the embodiment of the present application, the distance between the two opposite sides of the first support portion 20222 ranges from 130um to 250 um. Alternatively, the distance between the opposite sides of the first support portion 20222 is 160 um.
Wherein, the distance P between the centers of two adjacent first supporting portions 20222 ranges from 180um to 300 um. Alternatively, the distance between the centers of two adjacent first support portions 20222 is 300 um.
Fig. 8 is a diagram of a first arrangement of a first supporting portion of a backlight module of an optical fingerprint identification device under a screen according to an embodiment of the present disclosure; fig. 9 is a diagram of a second arrangement of the first supporting portion in the backlight module of the optical fingerprint identification device under the screen according to the embodiment of the present application. As shown in fig. 8 and 9, in particular, in order to facilitate the provision of the first support section 20222 on the reflective film 2022, a plurality of the first support sections 20222 are regularly arranged. For example, the arrangement in the form of a rectangular array in fig. 7. Or in a staggered diamond array as shown in fig. 8. The first supporting portions 20222 may be arranged in other forms, such as a pentagonal array, and the like, which is not limited herein.
In the embodiment of the present application, specifically, the backlight module 202 further includes a stiffening plate 2023, the stiffening plate 2023 is located on the surface of the reflective film 2022 facing the fingerprint identification module 101, and the stiffening plate 2023 has a light hole 20231. The reinforcing plate 2023 is used for shielding light and only allows the infrared fingerprint detection light 1021 to pass through the light hole 20231 to the fingerprint identification module 101. The reinforcing plate 2023 may be a steel plate.
Therefore, in order to save cost, in concrete implementation, the projection of each first support portion 20222 on the reinforcement plate 2023 may cover the light-transmitting hole 20231. That is, each first support section 20222 may be provided only in a part of the reflective film 2022 as long as each first support section 20222 can cover the light transmission hole 20231.
In the embodiment of the present application, the backlight module 202 further includes a light equalizing film 2024, and the light equalizing film 2024 covers a surface of the light guide plate 2021 facing away from the reflective film 2022. The light-equalizing film 2024 is used to equalize visible light, which is more uniform. The thickness of the light-equalizing film 2024 can range from 45um to 55 um.
In the embodiment of the present application, the backlight module 202 further includes a brightness enhancement film 2025, and the brightness enhancement film 2025 covers a surface of the light-equalizing film 2024 facing away from the light guide 2022 board. The brightness enhancement film 2025 is used for modifying the light-emitting angle of the backlight to enhance the front light.
In the optical fingerprint identification system of the lcd panel provided by the above embodiment, by disposing the backlight module 202, the backlight module 202 includes the light guide plate 2021 and the reflective film 2022, the surface of the reflective film 2022 facing the light guide plate 2021 has the supporting layer 20221, and the supporting layer 20221 is used for separating the light guide plate 2021 and the reflective film 2022. The support layer 20221 includes, by way of example, a first support portion 20222 including a plurality of spaced apart arrangements. By arranging the first supporting portion 20222, the gap between the reflective film 2022 and the light guide plate 2021 is increased, and meanwhile, the first supporting portion 20222 increases the haze of the upper surface of the reflective film 2022, so as to eliminate or weaken the interference pattern between the light guide plate 2021 and the reflective film 2022, and reduce the contrast of the interference pattern. The distance and height of the first supporting portions 20222 and the size relationship between the first supporting portions 20222 and the second supporting portions 20211 on the light guide plate 2021 are increased, so that the interference pattern between the light guide plate 2021 and the reflective film 2022 is reduced. The first supporting portion 20222 can effectively reduce the concentric interference pattern formed between the reflective film 2022 and the light guide plate 2021, and the display brightness is not greatly affected, so as to balance the interference pattern, the display brightness, and the performance of the finger print under the screen.
EXAMPLE III
Fig. 10 is a schematic structural diagram of a reflective film according to an embodiment of the present application. Referring to fig. 4 to 10, the present application provides a reflective film, which is suitable for a liquid crystal display 200 supporting a fingerprint identification function under the liquid crystal display 200, where the reflective film 2022 includes a light-permeable substrate layer 20223 and a support layer 20221 disposed on one side of the substrate layer 20223, and the support layer 20221 is used to cover a light guide plate 2021 above the reflective film 2022 at intervals, so as to reduce interference patterns formed between the light guide plate 2021 and the reflective film 2022 by infrared fingerprint detection light 1021, so that the infrared fingerprint detection light 1021 formed by a finger 300 above the liquid crystal display 200 is transmitted to the optical fingerprint identification apparatus 100 under the liquid crystal display 200 through the reflective film 2022.
The structure and the operation principle of the reflective film 2022 are described in detail in the second embodiment, which is not described herein again.
Specifically, the support layers 20221 may be uniformly spaced on the substrate layer 20223, that is, the support layers 20221 are disposed on the substrate layer 20223, rather than only the support layers 20221 are disposed on a part of the substrate layer 20223, so that the reflective film 2022 is convenient to process.
Example four
Referring to fig. 4 to 10, the present application further provides a liquid crystal display 200 supporting the function of fingerprint identification under the display, including a liquid crystal panel 201 and a backlight module 202, where the backlight module 202 is disposed below the liquid crystal panel 201;
the backlight module 202 is used for providing a backlight source for the liquid crystal panel 201 and transmitting the infrared fingerprint detection light 1021 formed by the finger 300 above the liquid crystal display screen 200 to the off-screen optical fingerprint identification device 100 below the backlight module 202; the backlight module 202 includes the reflective film 2022 provided in the second embodiment or the third embodiment.
The structure and the working principle of the backlight module 202 and the reflective film 2022 in the backlight module 202 are described in detail in the above embodiments, which are not repeated herein.
In the embodiment of the present application, when the infrared fingerprint detection light 1021 is transmitted to the light guide plate 2021 and the reflective film 2022 of the backlight module 202, the interference pattern formed between the light guide plate 2021 and the reflective film 2022 by the infrared fingerprint detection light 1021 is reduced by the spacing effect of the reflective film 2022 towards the supporting layer 20221 on the surface of the light guide plate 2021. That is, in the embodiment of the present application, the supporting layer 20221 is disposed on the reflective film 2022 of the backlight module 202, wherein the supporting layer 20221 is located on the surface of the reflective film 2022 facing the light guide plate 2021. The supporting layer 20221 increases the gap between the light guide plate 2021 and the reflective film 2022, reduces the adsorption degree between the light guide plate 2021 and the reflective film 2022, and reduces the width and the distance of the interference pattern, in which the width of the interference pattern route becomes narrow and the distance of the interference pattern changes from dense to sparse, thereby destroying the formation condition of the interference pattern. The problem that in the prior art, the contact between the light guide plate 2021 and the reflecting film 2022 is uneven, and Newton rings or interference lines which interfere with fingerprint imaging are easily generated, so that fingerprint identification is influenced is solved. Meanwhile, the supporting layer 20221 is arranged on the reflecting film 2022, and the roughness of the surface of the reflecting film 2022 is increased by the supporting layer 20221, so that the haze of the reflecting film 2022 is increased, interference grains are shielded, and the contrast of the interference grains is favorably reduced.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (23)
1. An optical fingerprint identification device under screen is suitable for a liquid crystal display screen with a backlight module, and is characterized in that a fingerprint identification area of the optical fingerprint identification device under screen is positioned in a display area of the liquid crystal display screen, the optical fingerprint identification device under screen comprises a fingerprint identification module, and the fingerprint identification module comprises an optical fingerprint sensor and a light path guide structure;
the optical fingerprint sensor comprises an optical sensing array with a plurality of sensing units, and the optical sensing array is used for receiving infrared fingerprint detection light which is formed by a finger above the liquid crystal display screen and passes through the liquid crystal display screen, and detecting fingerprint information of the finger according to the infrared fingerprint detection light;
the light path guide structure is arranged below a backlight module of the liquid crystal display screen and used for guiding the infrared fingerprint detection light to the optical fingerprint sensor;
wherein, infrared fingerprint detects the light when transmitting to backlight unit's light guide plate and reflectance coating, through the reflectance coating is towards the interval effect of the supporting layer on light guide plate surface to reduce infrared fingerprint detects the light in the light guide plate with the interference line that forms between the reflectance coating.
2. The off-screen optical fingerprint recognition device according to claim 1, further comprising an infrared light source for emitting infrared light to the fingerprint recognition area of the liquid crystal display device to form the infrared fingerprint detection light with a finger above the fingerprint recognition area of the liquid crystal display device.
3. An optical fingerprint identification system of a liquid crystal display screen, characterized by comprising the liquid crystal display screen and the optical fingerprint identification device under the screen of claim 1 or 2, wherein the optical fingerprint identification device under the screen is arranged under the liquid crystal display screen, and the optical fingerprint identification device under the screen is used for detecting fingerprint information of a finger above the liquid crystal display screen;
the liquid crystal display screen comprises a liquid crystal panel and a backlight module, wherein the backlight module is arranged below the liquid crystal panel;
the backlight module is used for providing a backlight source for the liquid crystal panel and transmitting infrared fingerprint detection light formed by fingers above the liquid crystal display screen to the below-screen optical fingerprint identification device below the backlight module;
the backlight module comprises a light guide plate and a reflecting film which are arranged in a stacked mode, the reflecting film faces the optical fingerprint identification device under the screen, the light guide plate faces the liquid crystal panel, a supporting layer is arranged on the surface, facing the light guide plate, of the reflecting film, and the supporting layer is used for spacing the light guide plate and the reflecting film.
4. The lcd optical fingerprint identification system of claim 3 wherein the support layer comprises a plurality of first support portions spaced apart.
5. The optical fingerprint identification system of claim 4, wherein a surface of the first supporting portion facing the light guide plate is a curved surface.
6. The optical fingerprint identification system of claim 4, wherein the distance between the surface of the first supporting part facing the light guide plate and the surface of the first supporting part facing the reflective film is in the range of 1um to 3 um.
7. The LCD optical fingerprint identification system of claim 4, wherein the light guide plate has a plurality of irregularly distributed second supports, and the second supports are located on a surface of the light guide plate facing the reflective film.
8. The lcd optical fingerprint recognition system of claim 7, wherein a distance between opposite sides of the first support is greater than or equal to a maximum distance between the second supports.
9. The lcd optical fingerprint recognition system of claim 7, wherein a distance between two adjacent first support portions is less than or equal to a minimum distance between the second support portions.
10. The optical fingerprint identification system of claim 6, wherein the distance between the two opposite sides of the first support part is in the range of 130um to 250 um.
11. The optical fingerprint identification system of claim 4, wherein the distance between the centers of two adjacent first supporting parts is in the range of 180um to 300 um.
12. The optical fingerprint identification system of any one of claims 4 to 11 wherein the plurality of first support portions are arranged regularly.
13. The optical fingerprint identification system of any one of claims 4 to 11, further comprising a reinforcing plate, wherein the reinforcing plate is located on a surface of the reflective film facing the fingerprint identification module, and the reinforcing plate has a light hole.
14. The lcd optical fingerprint recognition system of claim 13, wherein a projection of each of the first support portions on the reinforcing plate covers the light hole.
15. The optical fingerprint identification system of claim 3, wherein the backlight module further comprises a light homogenizing film, and the light homogenizing film is covered on a surface of the light guide plate facing away from the reflecting film.
16. The lcd optical fingerprint recognition system of claim 15, wherein the backlight module further comprises a brightness enhancement film, and the brightness enhancement film is covered on a side of the light-equalizing film facing away from the light guide plate.
17. The utility model provides a reflectance coating, is applicable to the liquid crystal display who supports fingerprint identification function under the screen, its characterized in that, the reflectance coating includes the substrate layer of light-permeable and is in the supporting layer that one side of substrate layer set up, the supporting layer is used for the interval to cover the light guide plate of reflectance coating top reduces infrared fingerprint detection light and is in the light guide plate with the interference line that forms between the reflectance coating makes infrared fingerprint detection light that the finger of liquid crystal display top formed passes through the reflectance coating transmits to optical fingerprint identification device under the screen of liquid crystal display below.
18. The reflective film of claim 17, wherein the support layer comprises a plurality of first support portions spaced apart.
19. The reflective film according to claim 18, wherein a distance between a surface of the first support facing the light guide plate and a surface of the first support facing the reflective film is in a range of 1um to 3 um.
20. The film of claim 18, wherein the distance between the opposing sides of the first support is in the range of 130um to 250 um.
21. The reflection film according to claim 18, wherein the distance between the centers of two adjacent first support parts is in the range of 180um to 300 um.
22. The reflection film according to claim 18, wherein the plurality of first supporting portions are regularly arranged.
23. A liquid crystal display screen supporting an underscreen fingerprint identification function is characterized by comprising a liquid crystal panel and a backlight module, wherein the backlight module is arranged below the liquid crystal panel;
the backlight module is used for providing a backlight source for the liquid crystal panel and transmitting infrared fingerprint detection light formed by fingers above the liquid crystal display screen to the off-screen optical fingerprint identification device below the backlight module; wherein the backlight module comprises the reflective film of any of claims 17-22.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2019/119721 WO2021097712A1 (en) | 2019-11-20 | 2019-11-20 | Under-display optical fingerprint recognition apparatus and system, reflective film and liquid crystal display screen |
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| Publication Number | Publication Date |
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| CN111095290A true CN111095290A (en) | 2020-05-01 |
| CN111095290B CN111095290B (en) | 2023-09-22 |
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| CN201980004397.2A Active CN111095290B (en) | 2019-11-20 | 2019-11-20 | Under-screen optical fingerprint identification device and system, reflecting film and liquid crystal display screen |
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| CN (1) | CN111095290B (en) |
| WO (1) | WO2021097712A1 (en) |
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| CN111095290B (en) | 2023-09-22 |
| WO2021097712A1 (en) | 2021-05-27 |
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