CN110727144A - Fingerprint identification module and electronic equipment - Google Patents
Fingerprint identification module and electronic equipment Download PDFInfo
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- CN110727144A CN110727144A CN201910644527.0A CN201910644527A CN110727144A CN 110727144 A CN110727144 A CN 110727144A CN 201910644527 A CN201910644527 A CN 201910644527A CN 110727144 A CN110727144 A CN 110727144A
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
- G06F1/1684—Constructional details or arrangements related to integrated I/O peripherals not covered by groups G06F1/1635 - G06F1/1675
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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
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- Crystallography & Structural Chemistry (AREA)
- Chemical & Material Sciences (AREA)
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Abstract
The invention discloses a fingerprint identification module, which comprises an LCD display module and a fingerprint identification device, wherein the LCD display module is used for identifying a biological fingerprint optical signal; the LCD display module comprises an LCD display screen and a backlight module; the backlight module comprises a light source, a light guide plate arranged on one side of the light source, a reflecting sheet arranged below the light guide plate, a diffusion sheet arranged above the light guide plate and a prism sheet arranged above the diffusion sheet, wherein the reflecting sheet is a multilayer optical film and comprises a first surface and a second surface which are arranged in parallel, the second surface is opposite to the first surface, and N positive-refractive-index micro-layers are stacked, the refractive indexes of the N-1 positive-refractive-index micro-layers from the first surface to the second surface are sequentially decreased progressively, the refractive index of the N positive-refractive-index micro-layer is greater than that of the N-1 positive-refractive-index micro-layer, and at least one negative-refractive-index micro-layer is arranged between the N positive-refractive-index micro-layers from the first surface to the second.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a fingerprint identification module for fingerprint identification in an LCD screen and electronic equipment.
Background
Currently, multilayer structured reflective sheets are commonly used in visual display systems, such as liquid crystal displays, and are currently found in electronic devices, such as cell phones, computers, and some flat panel televisions. These systems use a Liquid Crystal (LCD) panel that is backlit by an extended area backlight. The multi-layer structure reflector coated with the Ag reflective coating or the Al reflective coating is arranged above the backlight source or is compounded in the backlight source so as to transmit light which is emitted by the backlight source and can be used by the LCD panel and has one polarization state to the LCD panel. However, optical signals, particularly visible light and infrared light, cannot penetrate through the reflector plate and are collected below the backlight source and the backlight module, so that the optical sensor arranged below the reflector plate cannot accurately collect signals, the application range of the LCD panel is limited, and particularly the design of the fingerprint recognition LCD under the screen is limited.
Multilayer optical films that do not contain Ag or Al reflective coatings can also be designed for use as reflective sheeting, comprising thin layers of various light transmissive materials, which are referred to as microlayers because they are sufficiently thin that the reflective and transmissive properties of the optical film are determined in large part by constructive and destructive interference of light reflected at the microlayer interfaces. The multilayer optical film has specific reflective and transmissive properties depending on the amount of birefringence exhibited by each microlayer (if any), as well as the difference in relative refractive indices of adjacent microlayers, and other design characteristics. In some cases, the multilayer optical film may function as a reflective polarizer, for example, as a reflective sheet in other cases.
In some cases, the microlayers have a thickness and refractive index equivalent to 1/4 wavelength overlap, i.e., the microlayers are arranged in the form of optical repeat units or unit cells, each having two adjacent microlayers with the same optical thickness (f-ratio 50%), such optical repeat units effectively reflect light by constructive interference at twice the total optical thickness of the optical repeat units. While other layer structured films, such as multilayer optical films having 2 microlayers of optical repeat units (with f-ratios not equal to 50%), or films in which the optical repeat units comprise more than two microlayers, are designed to reduce or increase certain higher order reflections by configuring the optical repeat units, see, for example, U.S. Pat. Nos. 5,360,659(Arends et al) and 5,103,337(Schrenk et al). While utilizing a thickness gradient along the film thickness axis (e.g., z-axis) can provide a broader reflection band, such as a reflection band that extends across the visible region of a human and into the near infrared region, such that the microlayer stack can continue to reflect across the visible spectrum as the band shifts to shorter wavelengths at oblique angles of incidence. In U.S. Pat. No. 6,157,490(Wheatley et al), they sharpen band edges (i.e., at wavelength transitions between high reflection and high transmission) by adjusting the thickness gradient. However, when incident light enters these multi-microlayer structured materials, the emergent light is diffused in a large spatial range by a series of refraction and reflection of light, so that the directivity of light is poor.
Therefore, to realize fingerprint identification's in the LCD display screen function, need improve multilayer structure's reflector plate and fingerprint identification module's global design.
Disclosure of Invention
The invention mainly solves the technical problem of providing a backlight module for fingerprint identification in an LCD screen and electronic equipment, which can ensure that a fingerprint identification signal can effectively penetrate through the backlight module and be accurately collected.
In order to solve the technical problems, the technical scheme adopted by the invention is to provide a fingerprint identification module, which comprises an LCD display module and a fingerprint identification device, wherein the LCD display module is used for identifying biological fingerprint optical signals; the LCD display module comprises an LCD display screen and a backlight module; the backlight module comprises a light source, a light guide plate arranged at one side of the light source, a reflecting sheet arranged below the light guide plate, and a diffusion sheet arranged above the light guide plate, and a prism sheet disposed above the diffusion sheet, the reflection sheet being an optical film having a multi-layer structure, which comprises a first surface and a second surface on the opposite side arranged in parallel, and a stack of N positive refractive index microlayers, the stack of the positive refractive index microlayers is arranged between the first surface and the second surface and is arranged as an adjacent microlayer, the refractive indexes of N-1 positive refractive index microlayers from the first surface to the second surface are sequentially decreased progressively, the refractive index of the Nth positive refractive index microlayer is greater than that of the N-1 positive refractive index microlayer, and at least one negative refractive index microlayer is arranged between the first surface and the Nth positive refractive index microlayer on the second surface.
According to the fingerprint identification module, the negative refractive index micro-layer of the reflecting layer and the refractive indexes of the N-1 positive refractive index micro-layers from the first surface to the second surface are sequentially reduced, the refractive index of the Nth positive refractive index micro-layer is larger than that of the N-1 positive refractive index micro-layer, the light forms an optical loop in a limited space through the structural design, the light can be emitted at a position which is very close to the incident point of the first surface after passing through the reflecting path, the proportion of the light path emitted from the side face of the fingerprint identification module is greatly reduced, the reflecting efficiency is greatly improved, the divergence of the light beam can be effectively reduced, the light generates a collimation effect, and the directivity of the light beam is improved. On the other hand, the light of perpendicular to fingerprint identification module can see through the reflector plate to can gather on the one side of being located the reflector plate second surface. In addition, the incident light along the second surface to the first surface has high transmittance.
Furthermore, fingerprint identification module can be used for infrared light signal permeable LCD display screen and backlight unit and then accurate propagation to biological detection object of detection, for example the fingerprint, on the other hand, the feedback infrared light signal of detection object sees through LCD display screen and backlight unit perpendicularly, especially reflector plate to gather effectively by the fingerprint identification device is accurate, keep backlight unit's visible light source's luminous luminance and degree of consistency simultaneously, and then realize fingerprint identification function discernment and display effect keep in the screen of LCD display.
Preferably, the fingerprint recognition device is disposed below the reflection sheet.
Preferably, the negative index microlayers exhibit a negative index of refraction for visible light.
Preferably, the negative refractive index microlayer includes a two-dimensional periodic structure composed of an array of metals and an array of metal open-loop resonators.
Preferably, the negative refractive index microlayers comprise photonic crystals of periodic optical bandgap structures.
Preferably, the negative-refractive-index microlayers comprise a linear array of metal wires in a single negative-permeability insulating ferromagnetic material or insulating ferrimagnetic material.
Preferably, the negative refractive index microlayer further includes a transparent material portion, and the transparent material portion is disposed in the negative refractive index microlayer.
Preferably, the fingerprint identification device is embedded in the reflector plate.
Preferably, the fingerprint identification module further comprises an optical sensor element for emitting and/or receiving the optical signal of the biometric fingerprint; the biological fingerprint optical signal is infrared light.
The invention also discloses electronic equipment for fingerprint identification, which comprises the fingerprint identification module, a glass cover plate and a touch screen module.
Drawings
The invention and its advantages will be better understood by studying the following detailed description of specific embodiments, given by way of non-limiting example, and illustrated in the accompanying drawings, in which:
fig. 1 is an exploded view of a fingerprint recognition module according to embodiment 1 of the present invention.
Fig. 2 is an exploded view of the backlight module according to embodiment 1 of the present invention.
Fig. 3 is a sectional view of a reflective sheet in embodiment 1 of the present invention.
Fig. 4 is a sectional view of a reflective sheet in embodiment 2 of the present invention.
Detailed Description
Referring to the drawings, wherein like reference numbers refer to like elements throughout, the principles of the present invention are illustrated in an appropriate environment. The following description is based on illustrated embodiments of the invention and should not be taken as limiting the invention with regard to other embodiments that are not detailed herein.
The word "embodiment" is used herein to mean serving as an example, instance, or illustration. In addition, the articles "a" and "an" as used in this specification and the appended claims may generally be construed to mean "one or more" unless specified otherwise or clear from context to be directed to a singular form.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Further, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise direct contact of the first and second features through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Example 1
First, referring to fig. 1 to 3, a fingerprint identification module according to embodiment 1 of the present invention will be described. The fingerprint recognition module according to embodiment 1 of the present invention includes an LCD display module and a fingerprint recognition device 13 for recognizing the optical signal of the biometric fingerprint; the LCD display module comprises an LCD display screen 11 and a backlight module 12; the backlight module includes a light source 124, a light guide plate 123 disposed at one side of the light source 124, a reflective sheet 125 disposed below the light guide plate 123, a diffusion sheet 122 disposed above the light guide plate 123, and a prism sheet 121 disposed above the diffusion sheet.
Fig. 3 is a cross-sectional view of a reflective sheet in example 1 of the present invention, which comprises a stack of 4 positive refractive index microlayers 101, 102, 103, 105 and one negative refractive index microlayer 104. The upper surface of the positive refractive index microlayer 101 is a first surface, and the lower surface of the positive refractive index microlayer 105 is a second surface. In example 1 of the present invention, the effect of light L1 produced by a multilayer stack having microlayers with different positive and negative refractive indices is shown in fig. 3. Negative poleThe refractive index microlayer 104 exhibits a negative refractive index nr for visible light. A first surface arranged in parallel and a second surface on the opposite side are provided with a refractive index n of 3 positive refractive index microlayers 101, 102, 1031、n2、n3Sequentially decreasing, the refractive index n of the 4 th positive refractive index microlayer 1050Greater than the refractive index n of the 3 rd positive refractive index microlayer 1033The utility model discloses a reflection efficiency, on the other hand, the light of perpendicular to fingerprint identification module can see through the reflector plate, thereby be located the reflector plate opposite side and gather, negative refractive index microlayer 104 sets up between positive refractive index microlayer 103 and 105, its structural design makes light form optical circuit in limited space, can carry out the outgoing at very close first surface incidence point after the reflection path for the proportion of light path from reflector plate and fingerprint identification module side outgoing reduces by a wide margin, thereby promote reflection efficiency by a wide margin, and on the other hand, the light of perpendicular to fingerprint identification module can see through the reflector plate, thereby is lie. The reflective sheet comprises polyethylene naphthalate or a copolymer thereof.
A schematic diagram of the effect of the negative index functional layer 104 on light propagation is shown in fig. 3. A negative index microlayer 104, the index of refraction nr, has the optical property that light propagates in the negative index microlayer with energy opposite to the phase. When light travels from a microlayer having a positive refractive index (as shown in fig. 3) through a plurality of microlayers having decreasing positive refractive indices into a 4 th microlayer 104 having a negative refractive index, the incident light ray is on the same side of the normal (the dashed line in fig. 3 shows the normal of the interface between adjacent layers) as the refracted light ray, thereby changing the direction of travel of the light. As shown in fig. 3, positive refractive index microlayers 101, 102, 103 are stacked on the negative refractive index microlayers 104, and when an incident light ray is incident from n1 through the interfaces of the microlayers 101, 102, 103, the refracted light ray is on the opposite side of the normal from the incident light ray. When a light ray passes through the interface of the negative index microlayers 104 through the positive index microlayers 103, the refracted light ray is on the same side of the normal as the incident light ray. It should be noted that Snell's (Snell) law is not applicable to the refraction direction of light at the interface between the negative refractive index micro-layer and the positive refractive index micro-layer, but the refraction angle generated after the incident light is refracted in each micro-layer still satisfies Snell's law.
As can be seen from the L1 optical path diagram of fig. 3, at least one negative refractive micro-layer is disposed between a plurality of positive refractive micro-layers, so that the divergence of the light beam can be effectively reduced, the light can be collimated, and the directivity of the light beam can be improved, and the L2 and L3 optical path diagrams can see that the reflective sheet has high transmittance for the light which is vertically incident and emitted, so that the incident light along the first surface to the second surface has high reflectance, and at the same time, the reflective sheet has high transmittance for the incident light along the second surface to the first surface.
The proportion that the light path was followed fingerprint identification module side outgoing reduces by a wide margin to promote reflection efficiency by a wide margin, can reduce the divergence of light beam effectively, make light produce collimation effect, thereby improve the directive property of light beam. On the other hand, the light of perpendicular to fingerprint identification module can see through the reflector plate to can gather on the one side of being located the reflector plate second surface. In addition, the incident light along the second surface to the first surface has high transmittance.
Furthermore, fingerprint identification module can be used for the infrared light signal permeable LCD display screen and backlight unit that detect and then accurate propagation to biological detection object, for example the fingerprint, on the other hand, the feedback infrared light signal of detection object sees through LCD display screen 11 and backlight unit 12 perpendicularly, especially reflector plate 125 to by the accurate collection effectively of fingerprint identification device 13, keep backlight unit 12's visible light source's luminance and degree of consistency simultaneously, and then realize fingerprint identification function discernment and display effect keep in the screen of LCD display.
The negative refractive index microlayer material described in example 1 does not naturally occur in nature, and has a two-dimensional periodic structure of an array of metals and an array of metal open-loop resonators. The method is based on the electromagnetic field theory, and Pendry proves that the negative refractive index material can be realized through Maxwell equation and material constitutive equation. See Phys. Rev. Lett., 76, 4773-4776 (1996). Through research and research, Smith et al successfully formed a two-dimensional periodic structure device by using an open-loop resonator and a lead of metal copper in 2000, and realized the manufacture of a negative refractive index material. See Phys. Rev. Lett., 84, 4184-. Subsequently, in 2005, Enkrich et al produced materials with negative refractive index for light with a wavelength of 800nm using a two-dimensional periodic structure consisting of a metal array and an array of metal open-loop resonators, see phys.
Example 2
Fig. 4 is a cross-sectional view of a reflector of a fingerprint identification module according to embodiment 2 of the present invention. Only the differences between example 2 and example 1 will be described below. The structure of the reflector plate of FIG. 4 comprises a stack of 5 positive refractive index microlayers 201, 202, 203, 205, 206 and one negative refractive index microlayer 204, wherein the upper surface of the positive refractive index microlayer 201 is a first surface, and the lower surface of the positive refractive index microlayer 206 is a second surface. In example 2 of the present invention, the effect of light L1 produced by a multilayer having microlayers with different positive and negative refractive indices is shown in fig. 4. The negative index microlayers 204 exhibit a refractive index nr for visible light. A first surface arranged in parallel and a second surface on the opposite side are arranged by means of a negative refractive index microlayer 204 and the refractive index n of 4 positive refractive index microlayers 201, 202, 203, 205 from said first surface to said second surface21、n22、n23、n24Sequentially decreasing, the refractive index n of the 5 th positive refractive index microlayer 20620Greater than the refractive index n of the 4 th positive refractive index microlayer 20524The negative refractive index microlayer 204 is arranged between the positive refractive index microlayers 203 and 205, the light does not form an optical loop in a limited space due to the structural design, but is still closer to the first surface incident point for emission than the non-negative refractive index microlayer after passing through the reflection path, so that the proportion of the light path emitted from the side face of the reflector plate is reduced, and the reflection efficiency is partially improved. The second surface comprises a plurality of corner cube reflectors as a retroreflective unit, and the reflection efficiency of the reflector plate is further improved. On the other hand, light perpendicular to the reflective sheet may be transmitted through the reflective sheet to be collected at the other side of the reflective sheet. The L2, L3 optical path diagrams can see that the reflector plate has high transmittance for the light which is vertically incident and emergent.
The effect of the negative index microlayers 204 on light propagation is schematically illustrated in fig. 4. A negative refractive index microlayer 204, a refractive index nr, having optical properties such that the energy and phase of light propagating in the negative refractive index microlayer are in phaseAnd the reverse. When light is emitted from a material layer having a positive refractive index (e.g. n in FIG. 4)21、n22、n23、n24Shown) travels into the 4 th microlayer having a negative refractive index after passing through a plurality of microlayers having decreasing positive refractive indices, the direction of travel of light is changed when the incident light ray is on the same side of the normal (the dashed line in fig. 4 shows the normal of the interface between adjacent layers) as the refracted light ray. As shown in FIG. 4, positive refractive index microlayers 201, 202, 203 are stacked on a negative refractive index microlayer 204 when an incident light ray passes from n21When incident on the interfaces of the microlayers 201, 202, 203, the refracted ray is on the opposite side of the normal from the incident ray. When a light ray passes through the interface of the negative index microlayers 204 through the positive index microlayers 203, the refracted light ray is on the same side of the normal as the incident light ray. Also, Snell (Snell) law is not applied to a light refraction direction at an interface between a negative refractive index material layer and a positive refractive index material layer, but a refraction angle generated after an incident light ray is refracted in each material still satisfies Snell's law.
The negative refractive index micro-layer 204 comprises the transparent material part, and the transparent material part is arranged in the negative refractive index micro-layer 204, so that the natural light can have stronger penetrating power, the perspective effect is enhanced, and more natural and real visual experience is realized. The reflective sheet comprises cellulose acetate. The negative index microlayer materials in embodiments of the present disclosure have a negative index of refraction for visible light, wherein the negative index microlayers comprise photonic crystals of periodic optical bandgap structures.
The proportion that the light path was followed fingerprint identification module side outgoing reduces by a wide margin to promote reflection efficiency by a wide margin, can reduce the divergence of light beam effectively, make light produce collimation effect, thereby improve the directive property of light beam. On the other hand, the light of perpendicular to fingerprint identification module can see through the reflector plate to can gather on the one side of being located the reflector plate second surface. In addition, the incident light along the second surface to the first surface has high transmittance.
Furthermore, fingerprint identification module can be used for the infrared light signal permeable LCD display screen and backlight unit that detect and then accurate propagation to biological detection object, for example the fingerprint, on the other hand, the feedback infrared light signal of detection object sees through LCD display screen 11 and backlight unit 12 perpendicularly, especially reflector plate 125 to by the accurate collection effectively of fingerprint identification device 13, keep backlight unit 12's visible light source's luminance and degree of consistency simultaneously, and then realize fingerprint identification function discernment and display effect keep in the screen of LCD display.
In various embodiments, a fingerprint identification module is disclosed. Contain the negative refraction index functional layer in the reflector plate of fingerprint identification module, this layer has the negative refraction index to light, can reduce the divergence of light after light passes through the negative refraction index again behind the positive refraction index layer, improves the collimation degree for light utilization efficiency in the fingerprint identification module obtains very big improvement, thereby the loss of reduction energy reduces product cost, increases and shows luminance, reduces the thickness of equipment.
The above description is only for the specific embodiments of the present disclosure, but the scope of the disclosure is not limited thereto, and any changes or substitutions that can be easily conceived by a person having ordinary skill in the art within the technical scope of the disclosure should be covered within the scope of the disclosure. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A fingerprint identification module, it includes: the LCD display module and the fingerprint identification device are used for identifying the biological fingerprint optical signal;
the LCD display module comprises an LCD display screen and a backlight module;
the backlight module comprises a light source, a light guide plate arranged at one side of the light source, a reflecting sheet arranged below the light guide plate, a diffusion sheet arranged above the light guide plate, and a prism sheet arranged above the diffusion sheet, wherein the reflective sheet is a multilayer-structured optical film comprising a first surface and an opposite second surface arranged in parallel, and a stack of N positive refractive index microlayers disposed between the first surface and the second surface and disposed as adjacent microlayers, the refractive indices of the N-1 positive refractive index microlayers from the first surface to the second surface decreasing in sequence, the refractive index of the N-th positive refractive index microlayer being greater than the refractive index of the N-1 positive refractive index microlayer, at least one negative refractive index microlayer being disposed between the first surface and the N-th positive refractive index microlayer.
2. The fingerprint identification module of claim 1, the fingerprint identification device disposed below the reflective sheet.
3. The fingerprint identification module of claim 2, said negative index microlayer exhibiting a negative index of refraction for visible light.
4. The fingerprint identification module of claim 2, the negative index microlayer comprising a two-dimensional periodic structure of an array of metals and an array of metal open-loop resonators.
5. The fingerprint identification module of claim 2, said negative index microlayer comprising a photonic crystal of periodic optical bandgap structure.
6. The fingerprint identification module of claim 2, the negative index microlayer comprising a linear array of metal wires in a single negative permeability insulating ferromagnetic material or insulating ferrimagnetic material.
7. The fingerprint identification module of claim 2, the negative index microlayer further comprising a transparent material portion, and the transparent material portion disposed in the negative index microlayer.
8. The fingerprint identification module of claim 1, wherein the fingerprint identification device is embedded in the reflective sheet.
9. The fingerprint identification module of claim 1, further comprising an optical sensor element to transmit and/or receive a biometric fingerprint optical signal; the biological fingerprint optical signal is infrared light.
10. An electronic device for fingerprint recognition, comprising: the fingerprint identification module of any one of claims 1-9, the glass cover plate, and the touch screen module.
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| CN201910644527.0A CN110727144A (en) | 2019-07-17 | 2019-07-17 | Fingerprint identification module and electronic equipment |
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| CN201910644527.0A CN110727144A (en) | 2019-07-17 | 2019-07-17 | Fingerprint identification module and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253374A (en) * | 2021-05-27 | 2021-08-13 | 武汉华星光电技术有限公司 | Fingerprint identification display device |
| WO2023168617A1 (en) * | 2022-03-09 | 2023-09-14 | 京东方科技集团股份有限公司 | Display panel and display device |
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