CN110068957A - Backlight module and LCD display device for fingerprint recognition in LCD screen - Google Patents
Backlight module and LCD display device for fingerprint recognition in LCD screen Download PDFInfo
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- CN110068957A CN110068957A CN201910361314.7A CN201910361314A CN110068957A CN 110068957 A CN110068957 A CN 110068957A CN 201910361314 A CN201910361314 A CN 201910361314A CN 110068957 A CN110068957 A CN 110068957A
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- backlight module
- macromolecule layer
- module according
- brightness enhancement
- enhancement film
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Classifications
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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
-
- 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
-
- 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
Abstract
The invention discloses a kind of backlight modules for fingerprint recognition in LCD screen comprising light source and be arranged in light source side light guide plate, the reflector plate below light guide plate is set, the diffusion sheet on the upside of light guide plate is set, the brightness enhancement film on the upside of diffusion sheet is set；Wherein, the surface of brightness enhancement film is equipped with multiple lens arrangements and multiple platform structures；Platform structure includes platform part；Platform structure is set between multiple lens arrangements and/or on multiple lens arrangements, so that the substantially vertical incident and substantially vertical outgoing of exterior light penetrates the plane of brightness enhancement film.Backlight module makes LCD mould group that fingerprint recognition signal be enabled to effectively to penetrate simultaneously Precise collection in LCD mould group, realizes that fingerprint identification function identifies in the screen of LCD display device.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of backlight module for fingerprint recognition in LCD screen and
LCD mould group.
Background technique
Fingerprint sensing and matching are a kind of reliable and widely used technologies.The common methods of fingerprint recognition are related to scanning sample
This fingerprint or its image and the image and/or specific characteristic for storing fingerprint image, can by the feature of sample fingerprint with deposited
It is that the information of the reference fingerprint in database is compared, to determine the correct identification of user, such as verification purposes.It is special
Not, (in display) fingerprint recognition by its ease for operation and multifunctionality and is suitable for compact just in screen at present
Formula electronic equipment is taken, and becomes to become more and more popular.
Currently, fingerprint recognition shows equipment mainly using OLED display in shielding, this is primarily due to OLED and shows
Device is thinner to be gentlier also easier to integrate fingerprint Identification sensor.However, liquid crystal display (LCD) has more cost relative to OLED
Advantage.Fingerprint recognition shows that the solution of equipment is that (under display) uses CMOS under LCD screen in existing LCD screen
Imaging sensor (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor), CMOS
Imaging sensor is not exclusively built in display, but can be realized in the zone of action of display by sacrificing some thickness
Fingerprint induction.But fingerprint recognition shows equipment not yet full maturity in the screen based on LCD display, especially cannot be considered in terms of
Fingerprint recognition signal effectively penetrating in LCD mould group and Precise collection.
Fingerprint recognition is shown in equipment in the screen of LCD display, as shown in Figure 1, by identifying that it is aobvious that pressing is covered on LCD
The fingerprint on glass cover-plate 140 in display screen；However the optical signalling of fingerprint is at least through LCD display and glass for identification
Glass cover board 140, and since LCD display is made of LCD mould group 130 and backlight module 120, in addition glass cover-plate has certain
Thickness.Therefore, during through LCD mould group, backlight module and glass cover-plate more serious folding can occur for optical signalling
It penetrates and scatters, or even total reflection.Especially, the feedback optical signal of biological fingerprint information is carried by functions multiple in backlight module
Optical diaphragm seriously affects, such as the refraction, scattering and reflection of brightness enhancement film, diffusion sheet, reflector plate to light signal fed back, thus
It causes that light signal fed back is lost or optical noise is seriously polluted, optical sensor 110 under LCD screen is caused to be collected less than having
Effect and accurate signal, and then can not identify biological fingerprint information.
Influencing maximum optical diaphragm to optical signalling Precise collection in backlight module is brightness enhancement film.In the prior art, increase
Bright film is arranged in the backlight module of LCD, to improve luminous efficiency.Fig. 2 is the diagram of conventional brightness enhancement film.As shown in Fig. 2, blast
Film 310 includes main part 320 and multiple lens arrangements 330.Lens arrangement 130 is isosceles right triangle prism and repetition
It is formed in main part 320 in a row and is arranged to array.Fig. 3 is between the visual angle and brightness for the brightness enhancement film for showing Fig. 2
The curve graph of relationship.As shown in figure 3, wherein abscissa indicates that light passes through the light output angle after traditional brightness enhancement film, ordinate is indicated
The brightness of light.The relation curve in vertical direction of the brightness at thick line expression visual angle and traditional brightness enhancement film in Fig. 3, and filament table
Show the relation curve in the horizontal direction of the brightness of visual angle and traditional brightness enhancement film.Therefore, traditional brightness enhancement film has the work of light aggregation
With.But for acquiring the optical signalling of biological fingerprint information when through traditional brightness enhancement film, aggregation and non-directional can also occur
Scattering, to cause object feedback loss of optical signal or optical noise seriously polluted.
Therefore, in the screen of LCD display fingerprint identification function realization, need the whole design to backlight module to improve,
The especially optical facilities design and the matched adjustment for designing other optical diaphragms of brightness enhancement film.
Summary of the invention
The invention mainly solves the technical problem of providing a kind of backlight module for fingerprint recognition in LCD screen and
LCD mould group enables to fingerprint recognition signal effectively to penetrate simultaneously Precise collection in LCD mould group.
In order to solve the above technical problems, one technical scheme adopted by the invention is that: a kind of backlight module comprising: light
Source and the light guide plate that light source side is arranged in, are arranged in the reflector plate below light guide plate, and the diffusion on the upside of light guide plate is arranged in
The brightness enhancement film on the upside of diffusion sheet is arranged in piece；Wherein, the surface of brightness enhancement film is equipped with multiple lens arrangements and multiple platform structures；
Platform structure includes platform part；Platform structure is set between multiple lens arrangements and/or on multiple lens arrangements, so that external
The substantially vertical plane through brightness enhancement film of light.
Here, it is substantially vertical through refer to through the optical signalling of platform structure and the angle of brightness enhancement film 90 ±
Within the scope of 15 °.Here, incident or outgoing optical signalling is adjusted to the parallel of substantially vertical brightness enhancement film by platform structure
Light, the setting of platform structure solve the problems, such as that light is totally reflected in the lens arrangement of traditional brightness enhancement film and non-directional scatters.
Outgoing optical signalling arcuate propagation to the detected object of brightness enhancement film of the invention for detection is detected, another
The light signal fed back of aspect test object can be close to nondestructively through brightness enhancement film and backlight module, and by under LCD screen
Optical sensor accurately and efficiently acquires, and then fingerprint identification function identification in the screen of realization LCD display.Platform structure connects
It is continuous or discontinuous be set between multiple lens arrangements and/or on multiple lens arrangements.
Preferably, brightness enhancement film includes the first macromolecule layer and the second macromolecule layer.First macromolecule layer has micro-structural
Surface, lens arrangement and platform structure setting are on microstructured surface；Lens arrangement and platform structure are in microstructured surface
Upper array arrangement.
Second macromolecule layer is disposed adjacent between the first macromolecule layer and diffusion sheet and with the first macromolecule layer.
The microstructured surface of first macromolecule layer is arranged in parallel with light guide plate or reflector plate, so that the light of backlight and fingerprint recognition light
Learning signal can sufficiently penetrate.
First macromolecule layer and the second macromolecule layer also have the function of UV Absorption, are filled in the first macromolecule layer and
The ultraviolet absorber of two macromolecule layers can reduce LCD and polymeric optical film because ultraviolet radioactive deteriorates.
Preferably, the angle between the plane of platform part and the plane of microstructured surface is less than 10 °.
Preferably, the width of platform part is less than 1/2 of minimum range between adjacent lens structure.
Preferably, the refractive index of platform structure is substantially equal to the refractive index of the first macromolecule layer.
Preferably, refractive index of the refractive index of platform structure less than the first macromolecule layer.
Preferably, lens arrangement and platform structure are also disposed on the second macromolecule layer.
Preferably, the orientation of the lens arrangement on the microstructured surface of the first macromolecule layer is different from the second macromolecule
The orientation of lens arrangement on layer.Further, the orientation of the lens arrangement on the microstructured surface of the first macromolecule layer, base
Originally perpendicular to the orientation of the lens arrangement on the second macromolecule layer.
Preferably, the lens knot on the lens arrangement and the second macromolecule layer on the microstructured surface of the first macromolecule layer
Structure respectively includes multiple triangular prisms or the rounded triangle prism with rounded vertex.
Preferably, the diffusion particle in diffusion sheet with striated or random dotted is evenly distributed in diffusion sheet.
Preferably, diffusion sheet is provided with low haze region, and the mist degree in low haze region is lower than other regions of the diffusion sheet
Mist degree.Further, diffusion sheet mist degree is increased by its low haze region to other parts, the radial gradient of mist degree.Alternatively, expanding
Discrete piece mist degree is alternately changed by low haze region to other parts, mist degree, forms ripple distribution or the fringe distribution of mist degree height.
The low haze region of diffusion sheet has both the effect of diffusion, while low haze region and light-permeable, moreover it is possible to promote the bright of backlight module
Degree.
Preferably, backlight module further includes optical sensor element, to emit and/or receive biological fingerprint optical signalling.
Preferably, optical sensor element is set between light guide plate and reflector plate.
Preferably, optical sensor element is set to the lower section of reflector plate.
Preferably, the embedded inside for being set to reflector plate of optical sensor element.
Preferably, optical sensor element is set to the top of brightness enhancement film.
Embodiment according to the present invention, the backlight module of the present invention can be applied to LCD display and for fingerprint recognitions
Electronic device.The backlight module of the present invention is applied to the electronic device of fingerprint recognition, and the essence to biological fingerprint information may be implemented
Really identification and verifying.
Detailed description of the invention
The present invention and its advantage will be provided by way of non-limiting example by research, and by shown in appended attached drawing
Particular implementation detailed description and better understand, in which:
Fig. 1 is that fingerprint recognition shows equipment in the screen of the LCD display of the prior art.
Fig. 2 is the diagram of brightness enhancement film in the prior art.
Fig. 3 is the curve graph of the relationship between the visual angle and brightness of brightness enhancement film in the prior art.
Fig. 4 is the schematic diagram according to the backlight module of the embodiment of the present invention 1.
Fig. 5 is the cross section structure diagram of the brightness enhancement film of the embodiment of the present invention 1.
Fig. 6 is the cross section structure diagram of the brightness enhancement film of the embodiment of the present invention 7.
Fig. 7 is the cross-sectional view of light direction of travel in platform structure shown in fig. 5 of the invention.
Fig. 8 is the first macromolecule layer of the brightness enhancement film of the embodiment of the present invention 1 and the cross section structure diagram of the second macromolecule layer.
Fig. 9 is that the first macromolecule layer of the brightness enhancement film of the embodiment of the present invention 2 and the cross section structure of the second macromolecule layer show
Figure.
Figure 10 is that the first macromolecule layer of the brightness enhancement film of the embodiment of the present invention 3 and the cross section structure of the second macromolecule layer show
Figure.
Figure 11 is that the first macromolecule layer of the brightness enhancement film of the embodiment of the present invention 4 and the cross section structure of the second macromolecule layer show
Figure.
Figure 12 is the first macromolecule layer cross section structure diagram of the brightness enhancement film of 5 backlight module of the embodiment of the present invention.
Figure 13 is the first macromolecule layer cross section structure diagram of the brightness enhancement film of 6 backlight module of the embodiment of the present invention.
Figure 14 is the first macromolecule layer cross section structure diagram of the brightness enhancement film of 8 backlight module of the embodiment of the present invention.
Figure 15 is the first macromolecule layer cross section structure diagram of the brightness enhancement film of 9 backlight module of the embodiment of the present invention.
Figure 16 is the diffusion barrier plane structure chart for indicating the embodiment of the present invention 5.
Figure 17 is the diffusion barrier plane structure chart for indicating the embodiment of the present invention 6.
Specific embodiment
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
Embodiment 1
Firstly, being illustrated by Fig. 4, Fig. 5, Fig. 7 with regard to the backlight module of the embodiment of the present invention 1.According to of the invention real
Apply the backlight module of example 1, backlight module include light source 221 and be arranged in light source 221 side light guide plate 220, setting exists
The reflector plate 210 of 220 lower section of light guide plate, is arranged in the diffusion sheet 230 of 220 upside of light guide plate, the increasing on the upside of diffusion sheet is arranged in
Bright film 240；Wherein, 2401 surface of substrate of brightness enhancement film 240 is equipped with multiple lens arrangements 2402 and multiple platform structures 2403；It is flat
Platform structure includes platform part 24031；Platform structure be set to multiple lens arrangements 2402 between, and make exterior light it is substantially vertical enter
Penetrate the plane that brightness enhancement film 240 is penetrated with substantially vertical outgoing.
Here, as shown in fig. 7, incident or outgoing optical signalling is adjusted to substantially vertical brightness enhancement film by platform structure 2403
The directional light of 240 planes.Through platform part outgoing there are mainly two types of mode, do not worn directly in 2403 side glazing of platform structure
Cross platform part outgoing L1；On the other hand, optical signalling again passes by reflector plate after the reflection of the side of platform structure 2403
L2 is emitted from platform part after 210 reflections.It here, can be from the platform by the optical signalling of 2403 offside reflection of platform structure
Structure 2403 is emitted, and can also be emitted from other adjacent platform structures of the platform structure.Therefore, the feedback light of test object
The outgoing optical signalling that signal can be close to nondestructively through brightness enhancement film 240 and backlight module, on the other hand for detection is accurate
It propagates to detected object to be detected, and is accurately and efficiently acquired by the optical sensor under LCD screen, and then realize
Fingerprint identification function identifies in the screen of LCD display.
Brightness enhancement film 240 includes the first macromolecule layer 310 and the second macromolecule layer 320.First macromolecule layer 310 has micro-
Structured surface, lens arrangement 2402 and platform structure 2403 are set on microstructured surface；Lens arrangement 2402 and platform
The array arrangement on microstructured surface of structure 2403.Second macromolecule layer 320 is located at the first macromolecule layer 310 and diffusion
It is disposed adjacent between piece and with the first macromolecule layer 310.The microstructured surface and light guide plate of first macromolecule layer 310 are anti-
It penetrates piece to be arranged in parallel, the light of backlight and fingerprint recognition optical signalling is sufficiently penetrated.First macromolecule layer, 310 He
Second macromolecule layer 320 also has the function of UV Absorption, is filled in the first macromolecule layer 310 and the second macromolecule layer 320
Ultraviolet absorber can reduce LCD and polymeric optical film because ultraviolet radioactive deteriorates.
Angle between the plane of platform part and the plane of microstructured surface is 0 °；The width of platform part is equal to adjacent
The 1/5 of minimum range between mirror structure 2402.The refractive index of platform structure 2403 is substantially equal to the refraction of the first macromolecule layer 310
Rate, platform structure 2403 and the first macromolecule layer 310 can be same optical material.
As shown in figure 8, lens arrangement 2402 and platform structure 2403 are also disposed on the second macromolecule layer 320, first is high
Platform structure 2403 on molecule is corresponding with the platform structure 2403 on the second macromolecule layer 320, and platform structure 2403 protrudes
320 plane of first macromolecule layer 310 or the second macromolecule layer has trapezoid cross section, and further promoting optical signal can penetrate
The efficiency and accuracy of brightness enhancement film 240.The orientation of lens arrangement 2402A on the microstructured surface of first macromolecule layer 310,
Orientation basically perpendicular to the lens arrangement 2402B on the second macromolecule layer 320.
It is saturating on lens arrangement 2402 and the second macromolecule layer 320 on the microstructured surface of first macromolecule layer 310
Mirror structure 2402 respectively includes multiple triangular prisms.The microstructured surface upper mounting plate structure 2403 of first macromolecule layer 310
Discontinuous to be set between multiple lens arrangements 2402, here, platform structure 2403 is set as being alternately arranged with lens arrangement 2402
Array.
Embodiment 2
Fig. 9 is please referred to, is that the first macromolecule layer 310 and second of the brightness enhancement film of 2 backlight module of the embodiment of the present invention is high
The cross section structure diagram of molecular layer 320.Only with regard to embodiment 2, different place is illustrated with embodiment 1 below, about it is similar it
Details are not described herein at place, is provided only with lens arrangement 2402 on the second macromolecule layer 320 of brightness enhancement film, is not provided with platform knot
Structure 2403.At this point, light can carry out optically focused movement and diverging movement by lens arrangement 2402, to homogenize respectively by first
The light that macromolecule layer 310 is issued avoids out the situation of light uneven (Mura).
Embodiment 3
Figure 10 is please referred to, is the first macromolecule layer 310 and second of the brightness enhancement film of 3 backlight module of the embodiment of the present invention
The cross section structure diagram of macromolecule layer 320.Only with regard to embodiment 3, different place is illustrated with embodiment 1 below, about similar
Details are not described herein for place, and 310 upper surface of the first macromolecule layer of brightness enhancement film is provided with the platform structure with trapezoid cross section
The position opposite with platform structure 2403A of 2403A, 310 lower surface of the first macromolecule layer are provided with platform structure 2403B.This
In, platform structure 2403B and the first macromolecule layer 310 are same material, are set to the gap of 2402 array of lens arrangement.
Platform structure 2403C and the second macromolecule layer 320 on second macromolecule layer 320 are same material, are set to
The gap of 2402 array of mirror structure.Here, on the platform structure 2403B of the first macromolecule layer 310 and the second macromolecule layer 320
Platform structure 2403C is corresponding.
Embodiment 4
Figure 11 is please referred to, is the first macromolecule layer 310 and second of the brightness enhancement film of 4 backlight module of the embodiment of the present invention
The cross section structure diagram of macromolecule layer 320.Only with regard to embodiment 4, different place is illustrated with embodiment 1 below, about similar
Details are not described herein for place, and 310 upper and lower surfaces of the first macromolecule layer of brightness enhancement film are provided with trapezoid cross section
Platform structure 2403, position is opposite.Here, platform structure 2403 is different from 310 material of the first macromolecule layer, platform structure
2403 refractive index is set to 2402 array of lens arrangement lower than the refractive index with the first macromolecule layer 310, platform structure 2403
Gap.
The refractive index of platform structure 2403 on second macromolecule layer 320 is lower than the second macromolecule layer 320, platform structure
2403 are set to the gap of 2402 array of lens arrangement.Here, the platform structure 2403 of the first macromolecule layer 310 and second high
Platform structure 2403 on molecular layer 320 is corresponding.
Embodiment 5
Figure 12 is please referred to, is 310 section of the first macromolecule layer knot of the brightness enhancement film of 5 backlight module of the embodiment of the present invention
Structure diagram.Only with regard to embodiment 5, different place is illustrated with embodiment 1 below, and about similarity, details are not described herein, is increased
310 upper surface of the first macromolecule layer of bright film is provided with the platform structure 2403 of cube, and position is opposite.Here, platform knot
Structure 2403 is different from 310 material of the first macromolecule layer, and the refractive index of platform structure 2403 is lower than and the first macromolecule layer 310
Refractive index, platform structure 2403 are set to the gap of 2402 array of lens arrangement.
Figure 16 is please referred to, is the plane structure chart of the diffusion barrier 230 of the embodiment of the present invention 5, diffusion unit 2301 is at item
Line shape is distributed on diffusion barrier 230, and therefore, the low haze region of diffusion sheet 230 has both the effect of diffusion, while low haze region
Light-permeable again, moreover it is possible to promote the brightness of backlight module.
Embodiment 6
Figure 13 is please referred to, is 310 section of the first macromolecule layer knot of the brightness enhancement film of 6 backlight module of the embodiment of the present invention
Structure diagram.Only with regard to embodiment 5, different place is illustrated with embodiment 1 below, and about similarity, details are not described herein, is increased
310 upper surface of the first macromolecule layer setting of bright film has the platform structure 2403 of inverted trapezoid cross section, platform structure 2403
It is set on lens arrangement 2402 and fills the gap of 2402 array of lens arrangement.Here, platform structure 2403 and the first high score
310 material of sublayer is identical.
Figure 17 is please referred to, is the plane structure chart of the diffusion barrier 230 of the embodiment of the present invention 6, is provided with low haze area
Domain 2320, the mist degree in low haze region 2320 are lower than the mist degree in other regions 2320 of the diffusion sheet.Alternatively, diffusion sheet
Mist degree is increased by its low haze region 2320 to other parts, the radial gradient of mist degree.Therefore, the low haze area of diffusion sheet 230
Domain 2320 has both the effect of diffusion, while low haze region 2320 and light-permeable, moreover it is possible to promote the brightness of backlight module.
Embodiment 7
Fig. 6 is please referred to, is 310 cross section structure of the first macromolecule layer of the brightness enhancement film of 7 backlight module of the embodiment of the present invention
Diagram.Only with regard to embodiment 7, different place is illustrated with embodiment 1 below, and about similarity, details are not described herein, blast
310 upper surface of the first macromolecule layer of film is continuously provided with the platform structure 2403 with trapezoid cross section.Here, platform structure
2403 is different from 2401 material of substrate of the first macromolecule layer 310, and the refractive index of platform structure 2403 is lower than and the first macromolecule
The refractive index of layer 310,2403 array of platform structure are set to the gap of 2402 array of lens arrangement.
Embodiment 8
Figure 14 is please referred to, is 310 section of the first macromolecule layer knot of the brightness enhancement film of 8 backlight module of the embodiment of the present invention
Structure diagram.Only with regard to embodiment 8, different place is illustrated with embodiment 1 below, and about similarity, details are not described herein, is increased
310 upper surface of the first macromolecule layer of bright film is embedded to be provided with the platform structure 2403 with inverted trapezoid cross section.Here, it puts down
Platform structure 2403 is different from 2401 material of substrate of the first macromolecule layer 310, and it is high that the refractive index of platform structure 2403 is equal to first
The refractive index of molecular layer 310,2403 array of platform structure are set to the gap of 2402 array of lens arrangement.
Embodiment 9
Figure 15 is please referred to, is 310 section of the first macromolecule layer knot of the brightness enhancement film of 9 backlight module of the embodiment of the present invention
Structure diagram.Only with regard to embodiment 9, different place is illustrated with embodiment 1 below, and about similarity, details are not described herein, is increased
310 upper surface of the first macromolecule layer of bright film is embedded to be provided with the platform structure 2403 with triangular-section, platform structure
2403 can be triangle cone or tetrahedron.Here, 2401 material of substrate of platform structure 2403 and the first macromolecule layer 310
Material is different, and the refractive index of platform structure 2403 is equal to the refractive index of the first macromolecule layer 310, and platform structure 2403 is set to
The gap of 2402 array of mirror structure.
Although hereinbefore by reference to some embodiments, invention has been described, of the invention not departing from
In the case where range, various improvement can be carried out to it and can replace component therein with equivalent.Especially, as long as not
There are structural conflict, the various features in presently disclosed each embodiment can be combined with each other by any way
It uses, the description for not carrying out exhaustive to the case where these combinations in the present specification is for omission length and to economize on resources
Consider.Therefore, the invention is not limited to specific embodiments disclosed herein, but including falling within the scope of the appended claims
All technical solutions.
Claims (19)
1. a kind of backlight module comprising:
The reflector plate below light guide plate is arranged in light source and the light guide plate that light source side is arranged in, and is arranged above light guide plate
Diffusion sheet, and the brightness enhancement film above diffusion sheet is set；
Wherein, the surface of the brightness enhancement film is equipped with multiple lens arrangements and multiple platform structures；
The platform structure includes platform part；And
The platform structure is set between multiple lens arrangements and/or on multiple lens arrangements, so that exterior light is substantially vertical
Through the plane of brightness enhancement film.
2. backlight module according to claim 1, it is characterised in that: the brightness enhancement film includes the first macromolecule layer and second
Macromolecule layer；
Wherein, first macromolecule layer and second macromolecule layer are disposed adjacent；
First macromolecule layer has microstructured surface, and the lens arrangement and the platform structure are set to micro-structural
On surface；
Second macromolecule layer is between first macromolecule layer and the diffusion sheet；
Second macromolecule layer is also equipped with the lens arrangement on surface.
3. backlight module according to claim 2, it is characterised in that: the plane of the platform part and the micro-structural table
Angle between the plane in face is less than 10 °.
4. backlight module according to claim 2, it is characterised in that: the width of the platform part is less than adjacent lens structure
Between minimum range 1/2.
5. backlight module according to claim 2, it is characterised in that: the refractive index of the platform structure is substantially equal to described
The refractive index of first macromolecule layer.
6. backlight module according to claim 2, it is characterised in that: the refractive index of the platform structure is less than described first
The refractive index of macromolecule layer.
7. according to any backlight module of claim 2-6, it is characterised in that: second macromolecule layer surface is also provided with
There is the platform structure.
8. backlight module according to claim 7, it is characterised in that: the micro-structural table of first macromolecule layer
The orientation of the lens arrangement on face, different from the orientation of the lens arrangement on second macromolecule layer.
9. backlight module according to claim 8, it is characterised in that: the micro-structural table of first macromolecule layer
The orientation of the lens arrangement on face, the orientation basically perpendicular to the lens arrangement on second macromolecule layer.
10. backlight module according to claim 2, it is characterised in that: first macromolecule layer it is described micro-structural
The lens arrangement on the lens arrangement and second macromolecule layer on surface respectively includes multiple triangular prisms or tool
There is the rounded triangle prism of rounded vertex.
11. backlight module according to claim 1, it is characterised in that: the diffusion particle in the diffusion sheet is with striated
Or it random dotted is evenly distributed in diffusion sheet.
12. backlight module according to claim 1, it is characterised in that: the diffusion sheet is provided with low haze region, described
The mist degree in low haze region is lower than the mist degree in other regions of diffusion sheet.
13. backlight module according to claim 1, it is characterised in that: the backlight module further includes optical sensor member
Part, to emit and/or receive biological fingerprint optical signalling；The biological fingerprint optical signalling is infrared light or ultraviolet light.
14. backlight module according to claim 13, it is characterised in that: the optical sensor element is set to light guide plate
Between reflector plate.
15. backlight module according to claim 13, it is characterised in that: the optical sensor element is set to reflector plate
Lower section.
16. backlight module according to claim 13, it is characterised in that: the optical sensor element is embedded to be set to instead
Penetrate the inside of piece.
17. backlight module according to claim 13, it is characterised in that: the optical sensor element is set to brightness enhancement film
Top.
18. a kind of LCD display, comprising: any backlight module in liquid crystal display panel and claim 1-17.
19. a kind of electronic device for fingerprint recognition, comprising: LCD display described in claim 18, glass cover-plate, with
And photosensitive element, to receive the feedback optical signal through the LCD display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910361314.7A CN110068957A (en) | 2019-04-30 | 2019-04-30 | Backlight module and LCD display device for fingerprint recognition in LCD screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910361314.7A CN110068957A (en) | 2019-04-30 | 2019-04-30 | Backlight module and LCD display device for fingerprint recognition in LCD screen |
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| CN111062367A (en) * | 2019-12-31 | 2020-04-24 | 武汉华星光电半导体显示技术有限公司 | Fingerprint identification device |
| CN111458932A (en) * | 2020-04-03 | 2020-07-28 | 深圳市德仓科技有限公司 | Backlight module and under-screen fingerprint identification display screen |
| EP3637316A4 (en) * | 2018-08-15 | 2020-08-19 | Shenzhen Goodix Technology Co., Ltd. | Lcd fingerprint recognition system, under-screen optical fingerprint recognition device, and electronic device |
| CN112198712A (en) * | 2020-10-16 | 2021-01-08 | 武汉华星光电技术有限公司 | Backlight module and display device |
| WO2021103888A1 (en) * | 2019-11-25 | 2021-06-03 | 华为技术有限公司 | Liquid crystal display apparatus |
| WO2021196034A1 (en) * | 2020-03-31 | 2021-10-07 | 深圳市汇顶科技股份有限公司 | Under-screen fingerprint identification apparatus, backlight module, liquid crystal display screen, and electronic device |
| CN114594629A (en) * | 2022-04-15 | 2022-06-07 | 武汉华星光电技术有限公司 | Fingerprint identification display panel and device |
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| CN114594629B (en) * | 2022-04-15 | 2023-12-08 | 武汉华星光电技术有限公司 | Fingerprint identification display panel and device |
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