CN110183993A - Screen protecting film and electronic equipment - Google Patents
Screen protecting film and electronic equipment Download PDFInfo
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- CN110183993A CN110183993A CN201910553938.9A CN201910553938A CN110183993A CN 110183993 A CN110183993 A CN 110183993A CN 201910553938 A CN201910553938 A CN 201910553938A CN 110183993 A CN110183993 A CN 110183993A
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- Prior art keywords
- protecting film
- screen protecting
- ultrasonic wave
- layer
- screen
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- 230000002633 protecting effect Effects 0.000 title claims abstract description 112
- 239000010410 layer Substances 0.000 claims description 144
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims description 23
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- 239000000741 silica gel Substances 0.000 claims description 18
- 229910002027 silica gel Inorganic materials 0.000 claims description 18
- 229920001971 elastomer Polymers 0.000 claims description 11
- -1 Diol ester Chemical class 0.000 claims description 10
- 239000012790 adhesive layer Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 239000000806 elastomer Substances 0.000 claims description 5
- 238000002604 ultrasonography Methods 0.000 claims description 5
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims 2
- 239000011248 coating agent Substances 0.000 abstract description 16
- 238000000576 coating method Methods 0.000 abstract description 16
- 230000035515 penetration Effects 0.000 abstract description 9
- 229920000139 polyethylene terephthalate Polymers 0.000 description 14
- 239000005020 polyethylene terephthalate Substances 0.000 description 14
- 238000002474 experimental method Methods 0.000 description 9
- 238000013003 hot bending Methods 0.000 description 8
- 239000011159 matrix material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000003666 anti-fingerprint Effects 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- KUCOHFSKRZZVRO-UHFFFAOYSA-N terephthalaldehyde Chemical compound O=CC1=CC=C(C=O)C=C1 KUCOHFSKRZZVRO-UHFFFAOYSA-N 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
Abstract
The embodiment of the present application also provides a kind of screen protecting film and electronic equipment, the screen protecting film is for being bonded display screen module, the display screen module is provided with ultrasonic fingerprint mould group away from the screen protecting film side, the screen protecting film can pass through the ultrasonic wave of the ultrasonic fingerprint mould group transmitting, the screen protecting film is equipped with resonant layer, the resonant layer is equipped with the neighbouring first surface of the ultrasonic fingerprint mould group and the second surface of the relatively described first surface, the resonant layer may make the ultrasonic wave emitted from the first surface towards the second surface to be superimposed generation resonance with from the second surface towards the ultrasonic wave that the first surface reflects.Above-mentioned screen protecting film reduces ultrasonic attenuation without compressed thickness, and the screen protecting film is allowed to take into account ultrasonic wave penetration performance, coating performance and mechanical property.
Description
Technical field
This application involves protection technical field of membrane, and in particular to a kind of screen protecting film and electronic equipment.
Background technique
Mobile phone usually posts screen protecting film at present, to prevent mobile phone screen from scratching.Part mobile phone is provided with ultrasonic wave and refers to
The ultrasonic wave of line recognition means, the transmitting of ultrasonic fingerprint recognition means belongs to mechanical wave, and above-mentioned ultrasonic wave is easy in screen protection
Decaying is easy in film, it usually needs the thickness of screen protecting film is reduced as far as possible, utmostly to reduce the loss to ultrasonic wave,
But the comprehensive performance decline that will lead to screen protecting film, weakens the defencive function of screen.
Summary of the invention
The embodiment of the present application also provides a kind of screen protecting film, and the screen protecting film is for being bonded display screen module, institute
It states display screen module and the screen protecting film side is provided with ultrasonic fingerprint mould group, the screen protecting film can pass through institute
The ultrasonic wave of ultrasonic fingerprint mould group transmitting is stated, the screen protecting film is equipped with resonant layer, and the resonant layer is equipped with neighbouring described
The second surface of the first surface of ultrasonic fingerprint mould group and the relatively described first surface, the resonant layer may make from described
The ultrasonic wave that one surface emits towards the second surface and the ultrasonic laminated reflected from the second surface towards the first surface
Add generation resonance.
The embodiment of the present application also provides a kind of electronic equipment, and the electronic equipment includes display screen module and ultrasonic fingerprint
Mould group and screen protecting film as described above, the screen protecting film are bonded the display screen module, the ultrasonic fingerprint
Mould group is fixed on the display screen module away from the screen protecting film side.
Screen protecting film and electronic equipment provided by the embodiments of the present application are equipped with resonant layer by the screen protecting film,
And the resonant layer is equipped with the neighbouring first surface of the ultrasonic fingerprint mould group and the second surface of the relatively described first surface,
The resonant layer may make the ultrasonic wave that emits from the first surface towards the second surface with from the second surface towards institute
The ultrasonic wave superposition for stating first surface reflection generates resonance, reinforces the transmission intensity of ultrasonic wave, guarantees ultrasonic fingerprint identification effect
Fruit takes into account the screen protecting film so that the screen protecting film reduces ultrasonic attenuation without compressed thickness
Ultrasonic wave penetration performance, coating performance and mechanical property.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application, below will be to needed in the embodiment attached
Figure is briefly described, it should be apparent that, the drawings in the following description are only some examples of the present application, for this field
For those of ordinary skill, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram one of fingerprint identification device provided by the embodiments of the present application；
Fig. 2 is the structural schematic diagram two of fingerprint identification device provided by the embodiments of the present application；
Fig. 3 is the structural schematic diagram three of fingerprint identification device provided by the embodiments of the present application；
Fig. 4 is experimental data one provided by the embodiments of the present application；
Fig. 5 is experimental data two provided by the embodiments of the present application；
Fig. 6 is experimental data three provided by the embodiments of the present application；
Fig. 7 is the structural schematic diagram four of fingerprint identification device provided by the embodiments of the present application；
Fig. 8 is the structural schematic diagram of electronic equipment provided by the embodiments of the present application.
Specific embodiment
Referring to Fig. 1, the embodiment of the present application provides a kind of screen protecting film 100, the screen protecting film 100 is for being bonded
Display screen module 60, the display screen module 60 are provided with ultrasonic fingerprint mould group 70 away from 100 side of screen protecting film,
The screen protecting film 100 can pass through the ultrasonic wave that the ultrasonic fingerprint mould group 70 emits, and the screen protecting film 100 is equipped with
Resonant layer 10, the resonant layer 10 are equipped with the first surface 11 and relatively described first table of the neighbouring ultrasonic fingerprint mould group 70
The second surface 12 in face 11, the resonant layer 10 may make the ultrasound emitted from the first surface 11 towards the second surface 12
Wave is superimposed generation resonance with from the second surface 12 towards the ultrasonic wave that the first surface 11 reflects.
It is equipped with resonant layer 10 by the screen protecting film 100, and the resonant layer 10 is equipped with the neighbouring ultrasonic wave and refers to
The second surface 12 of the first surface 11 of line mould group 70 and the relatively described first surface 11, the resonant layer 10 may make described in
The ultrasonic wave that first surface 11 emits towards the second surface 12 with reflected from the second surface 12 towards the first surface 11
Ultrasonic wave superposition generate resonance, reinforce the transmission intensity of ultrasonic wave, guarantee ultrasonic fingerprint recognition effect, thus the screen
Protective film 100 reduces ultrasonic attenuation without compressed thickness, allows the screen protecting film 100 to take into account ultrasonic wave and penetrates
Performance, coating performance and mechanical property.
Referring to Fig. 1, the embodiment of the present application provides a kind of fingerprint identification device 200, the fingerprint identification device 200 includes
Display device and screen protecting film 100.The display device includes display screen module 60 and is fixed on the display screen module 60
The ultrasonic fingerprint mould group 70 of side.The screen protecting film 100 fits in the display screen module 60 away from the ultrasonic wave
70 side of fingerprint mould group.The ultrasonic fingerprint mould group 70 can emit the ultrasonic wave for fingerprint recognition, and the ultrasonic wave can
Through the display screen module 60 and the screen protecting film 100.When finger is placed in the fingerprint identification device 200 by user
The position of the corresponding ultrasonic fingerprint mould group 70, the ultrasonic wave reflect back into the ultrasound on the surface of user's finger
Wave fingerprint mould group 70, the ultrasonic fingerprint mould group 70 can receive the ultrasonic signal returned and be converted into electric signal, according to institute
The fingerprint recognition image of finger can be formed by stating electric signal, so as to realize fingerprint identification function.
Referring to Fig. 2, in present embodiment, the screen protecting film 100 by be stacked multiple film layers 131,132,
133 and 134 are constituted.Multiple film layers 131,132,133 and 134 may include PET
(Polyethyleneterephthalate polyethylene terephthalate) layer, TPU
(Thermoplasticpolyurethanes thermoplastic polyurethane elastomer rubber) layer and layer of silica gel etc., so that the screen is protected
Cuticula 100 forms composite film structure, has good comprehensive performance, such as coating performance, shock resistance and anti-scratch performance
Deng.Certainly, in other embodiments, the layer structure of the screen protecting film 100 can also self-setting according to actual needs.
In routine techniques, technical staff be usually avoid ultrasonic wave from excessively decaying, usually by thicknesses of layers control compared with
Thin level, but 13 thickness of film layer of any one or a few persons in multiple film layers 131,132,133 and 134 are cut down,
The performance of the screen protecting film 100 will be caused short slab occur, influence the screen protecting film 100 to display screen module 60
Protecting effect.
Please refer to Fig. 1 and 2, in present embodiment, the resonant layer 10 can be multiple films in the screen protecting film 100
Layer 131,132,133 and 134 in any one.The ultrasonic wave the screen protecting film 100 multiple film layers 131,
132, it is easy decaying in 133 and 134, the biography for reinforcing the ultrasonic wave can be played by resonance mode by the resonant layer 10
Intensity is broadcast, so that the ultrasonic wave be avoided excessively to decay and influence ultrasonic fingerprint recognition effect.
In a kind of embodiment, the distance of the first surface 11 to the second surface 12 is equal to the ultrasonic wave in institute
State the half-wavelength in resonant layer 10 integral multiple and preset threshold and.The thickness of the resonant layer 10 is equal to the first surface
11 to the second surface 12 distance, then 10 thickness of resonant layer is equal to half of the ultrasonic wave in the resonant layer 10
The integral multiple of wavelength and preset threshold and, the preset threshold can be -5 μm~+5 μm, so that 10 thickness of the resonant layer
It is substantially equal to the integral multiple of half-wavelength of the ultrasonic wave in the resonant layer 10, the ultrasonic wave can be in the resonant layer
Standing wave is formed in 10, and the resonant layer 10 is made to generate standing wave resonance, is conducive to the efficiency for improving probe radiation ultrasonic wave.Its
In, the part ultrasonic wave occurs reflection in the second surface 12 and returns to the first surface 11, and from the first surface
11 are superimposed to form standing wave towards the incident ultrasonic wave of the second surface 12.10 thickness of resonant layer is substantially equal to the ultrasonic wave
N times of half-wavelength in the resonant layer 10, n can be arbitrary integer, can according to need self-setting.
The ultrasonic wave is equal to propagation of the ultrasonic wave in the resonant layer 10 in the wavelength in the resonant layer 10
The ratio of the frequency of sound wave of speed and the ultrasonic wave.Wherein, spread speed of the ultrasonic wave in the resonant layer 10 can
To be determined by instrument test.The frequency of sound wave of the ultrasonic wave can be 12MHZ, and inventor is by experimental verification frequency
The ultrasonic wave of 12MHZ can guarantee the speed and quality of ultrasonic fingerprint identification.Certainly, in other embodiments, described super
The frequency of sound wave for the ultrasonic wave that sound wave fingerprint mould group 70 emits is not limited to the example above, can according to need self-setting.
Referring to Fig. 3, further, the screen protecting film 100 is equipped with fitting glue-line 20, the screen protecting film 100
It is bonded display screen module 60 through the fitting glue-line 20, the fitting glue-line 20 forms the resonant layer 10.
In present embodiment, the fitting glue-line 20 is that the screen protecting film 100 directly fits the display screen module
60 part, the fitting glue-line 20 are adsorbed in the display screen module 60, realize the firm attachment of the screen protecting film 100
In the display screen module 60.The fitting glue-line 20 is equipped with the first surface 11 and the second surface 12, and described the
One surface 11 is the surface that the fitting glue-line 20 is bonded the display screen module 60, and the second surface 12 is set to the patch
Relatively described 11 side of first surface of glue-line 20 is closed, then the thickness of the fitting glue-line 20 is equal to the first surface 11 to described
The distance of second surface 12.The hardness of the fitting glue-line 20 is small, propagation speed of the ultrasonic wave in the fitting glue-line 20
Degree is less than 1700m/s, then the ultrasonic wave is easy decaying in the fitting glue-line 20, is unable to satisfy ultrasonic fingerprint identification
It needs.It is equal to the distance of the first surface 11 to the second surface 12 by the thickness of the fitting glue-line 20, and described
The thickness for being bonded glue-line 20 is equal to the integral multiple and preset threshold of half-wavelength of the ultrasonic wave in the fitting glue-line 20
With, the fitting glue-line 20 can form resonant layer 10, so that emit from the first surface 11 towards the second surface 12
Ultrasonic wave is superimposed generation resonance with from the second surface 12 towards the ultrasonic wave that the first surface 11 reflects, thus described in increasing
The intensity that ultrasonic wave is propagated in the fitting glue-line 20, effectively containment ultrasonic attenuation.
The thickness of the fitting glue-line 20 is substantially equal to n times of half-wavelength of the ultrasonic wave in the joint adhesive, and n can
Think arbitrary integer, can according to need self-setting.N can be 1, then the thickness of the fitting glue-line 20 is substantially equal to described
Half-wavelength of the ultrasonic wave in the joint adhesive, so that the thickness of the fitting glue-line 20 is moderate, and the fitting glue-line 20 can
To take into account coating performance and ultrasonic wave penetration performance.
In a kind of embodiment, the fitting glue-line 20 is layer of silica gel, the fitting glue-line 20 with a thickness of 40 μm~50 μ
m。
Referring to Fig. 4, in present embodiment, ultrasonic wave that frequency is 12MHz is determined by experiment in silica gel in inventor
Spread speed, it can be seen that spread speed of the ultrasonic wave in the silica gel is less than 1700m/s, the then ultrasonic wave
It is easy decaying in the layer of silica gel, is unable to satisfy the needs of ultrasonic fingerprint identification.Inventor also calculates the ultrasonic wave
Half-wavelength and 1/8th wavelength in silica gel.If the thickness of the fitting glue-line 20 is less than the ultrasonic wave in silica gel
The thickness of 1/8th wavelength, the fitting glue-line 20 is too small, it is possible to reduce the propagation attenuation of the ultrasonic wave, but not can guarantee
The coating performance of the screen protecting film 100.Present embodiment is described by the way that the thickness of the fitting glue-line 20 to be substantially equal to
Half-wavelength of the ultrasonic wave in the fitting glue-line 20, can determine the fitting glue-line 20 with a thickness of 40 μm~50 μm, institute
Stating fitting glue-line 20 can satisfy the condition that the ultrasonic resonance is reinforced, and form the resonant layer 10, and the fitting glue-line
20 thickness is moderate, can be excessively thin to avoid the fitting glue-line 20 and influence coating performance.
Further, it is described fitting glue-line 20 storage modulus be 2000kPa~3000kPa or 20000kPa~
30000kPa。
In present embodiment, the storage modulus of the fitting glue-line 20 can be room temperature by Instrument measuring, test temperature,
Test frequency is 1Hz.The storage modulus of the fitting glue-line 20 is used to characterize the hardness of the fitting glue-line 20.The joint adhesive
The storage modulus of layer 20 is bigger, indicates that the hardness of the fitting glue-line 20 is bigger, then storage modulus is the joint adhesive of 80-90kPa
Layer 20 hardness, storage modulus be 2000kPa~3000kPa fitting glue-line 20 hardness and storage modulus be 20000kPa~
The hardness of the fitting glue-line 20 of 30000kPa is sequentially increased.The fitting glue-line 20 that storage modulus is 80~90kPa is labeled as soft silicon
Glue.The fitting glue-line 20 that storage modulus is 2000kPa~3000kPa is labeled as middle silica gel.Storage modulus be 20000kPa~
The fitting glue-line 20 of 30000kPa is labeled as hard silica gel.
Screen protecting film 100 is cooperated to use referring to Fig. 5, the ultrasonic fingerprint mould group 70 is determined by experiment in inventor
Signal-to-noise ratio.As can be seen that the screen protecting film 100 with soft silica gel layer is corresponding in the case where other film layer group split-phases are same
Fingerprint mould group signal-to-noise ratio be less than the corresponding fingerprint mould group noise of screen protecting film 100 with middle layer of silica gel or hard layer of silica gel
Than propagation attenuation of that is, described ultrasonic wave in soft silica gel is significantly greater than propagation of the ultrasonic wave in middle silica gel or hard silica gel
Decaying.Therefore, middle silica gel or hard silica gel are set by the fitting glue-line 20 of the screen protecting film 100, i.e., the described fitting glue-line
20 storage modulus is 2000kPa~3000kPa or 20000kPa~30000kPa, without by reducing thicknesses of layers
To guarantee transmission intensity of the ultrasonic wave in the screen protecting film 100.
Referring to Fig. 3, further, the screen protecting film 100 is equipped with base layer 30, the base layer 30 is neighbouring described
Second surface 12, and be stacked with the glue-line 20 that is bonded, the ultrasonic wave is greater than in the spread speed of the base layer 30
1700m/s。
Referring to Fig. 4, in present embodiment, the material of the base layer 30 be polyethylene terephthalate (PET,
Polyethyleneterephthalate).Inventor be determined by experiment frequency be 12MHz ultrasonic wave in poly- terephthaldehyde
Spread speed in sour glycol ester (PET).Inventor also calculates the ultrasonic wave in polyethylene terephthalate
(PET) half-wavelength and 1/8th wavelength in.In other embodiments, the material of the base layer 30 is not limited to above-mentioned
Citing, can according to need self-setting.
Referring to Fig. 6, inventor is found through experiments that, the ultrasonic wave is greater than in the spread speed of the base layer 30
1700m/s, propagation attenuation of the ultrasonic wave in the base layer 30 is small, the thickness of the base layer 30 and the ultrasonic wave
Propagation attenuation without obvious relation.Inventor is determined by experiment the ultrasonic fingerprint mould group 70 and cooperates screen protecting film 100
The signal-to-noise ratio used.As can be seen that with a thickness of 50 μm, 80 μm and 100 μm of the corresponding screen protecting film of base layer 30 (pet layer)
100 parts can obtain suitable signal-to-noise ratio (SNR is greater than 4), can satisfy the use demand of ultrasonic fingerprint mould group 70.But
If the thickness of base layer 30 is less than the ultrasonic wave in 1/8th wavelength of base layer 30 ((pet layer)), it is possible to reduce institute
The propagation attenuation of ultrasonic wave is stated, but the matrix strength that will lead to the screen protecting film 100 is low, is unable to satisfy fall protection performance
It is required with coating performance etc..Therefore, the thickness of the base layer 30 is greater than eight points of the ultrasonic wave in the base layer 30
One of wavelength can take into account ultrasonic penetration performance and protective performance so that the thickness of the base layer 30 is moderate.Wherein, described
Ultrasonic wave is equal to spread speed of the ultrasonic wave in the base layer 30 in the wavelength in the base layer 30 and surpasses with described
The ratio of the frequency of sound wave of sound wave.
In present embodiment, the base layer 30 is hard polyethylene terephthalate.If the thickness of base layer 30
The ultrasonic wave is substantially equal in the half-wavelength of polyethylene terephthalate, then the base layer 30 can also play resonance
Reinforce the effect of ultrasonic wave, but the base layer 30 is blocked up, causes hardness excessive, influences the coating performance of screen protecting film 100,
And it is unable to satisfy hot bending process requirement.Therefore, the thickness of the base layer 30 can be less than the ultrasonic wave in the base layer
Half-wavelength in 30, and it is greater than 1/8th wavelength of the ultrasonic wave in the base layer 30, so that the base layer 30
Thickness it is moderate, the screen protecting film 100 can take into account coating performance, hot bending performance and ultrasonic penetration performance.
Material for the base layer 30 is hard polyethylene terephthalate, and the thickness of the base layer 30 is small
In 100 μm, and it is greater than 25 μm.In present embodiment, the base layer 30 with a thickness of 50 μm so that the screen protection has
Enough matrix strengths, it is ensured that the screen protecting film 100 meets fall protection performance, coating performance and hot bending constancy
Energy etc. requires.In other embodiments, the thickness of the base layer 30 is also not necessarily limited to the example above, can be according to actual needs
It is configured.
Referring to Fig. 7, the base layer 30 is soft polyethylene terephthalate in another embodiment.Institute
State base layer 30 thickness be equal to half-wavelength of the ultrasonic wave in the resonant layer 10 integral multiple and preset threshold and,
So that the base layer 30 forms another described resonant layer 10.To which the screen protecting film 100 is set, there are two described total
Shake layer 10, and two resonant layers 10 can increase the intensity of the ultrasonic wave by resonance mode, effectively containment ultrasonic wave
Decaying guarantees ultrasonic fingerprint recognition effect.
Material for the base layer 30 is soft polyethylene terephthalate, and the screen protecting film 100 has
There is better hot bending shaping performance, the thickness of the base layer 30 may be approximately equal to 100 μm, so that the screen protection has
Enough matrix strengths, it is ensured that the screen protecting film 100 meets fall protection performance, coating performance and hot bending constancy
Energy etc. requires.Also, the base layer 30 has elasticity, and the base layer 30 can be mounted directly on the fitting glue-line 20
The structure of second surface 12, the screen protecting film 100 simplifies, it is not necessary to elastic cord breaker 51 and optical adhesive layer 50 be arranged, simplify
Laminated construction.In other embodiments, the thickness of the base layer 30 is also not necessarily limited to the example above, can be according to actual needs
It is configured.
Referring to Fig. 3, further, the screen protecting film 100 is equipped with hardened layer 40, the hardened layer 40 is laminated in institute
Base layer 30 is stated far from 20 side of fitting glue-line, the thickness of the hardened layer 40 is less than the ultrasonic wave to be protected in the screen
/ 8th wavelength in cuticula 100.In present embodiment, the hardened layer 40 increases the surface of the screen protecting film 100
Wear-resisting property and anti-fingerprint performance can be improved in hardness.The hardness of the hardened layer 40 is higher than the hardness of the base layer 30, institute
It is small to state propagation attenuation of the ultrasonic wave in the hardened layer 40.Therefore, the thickness of the hardened layer 40 can be less than the ultrasound
/ 8th wavelength of the wave in the screen protecting film 100.The thickness of the hardened layer 40 can be 3 μm~5 μm.Conventional
Screen base layer 30 is only 25 μm, even if increasing hardened layer 40, matrix strength and hardness are also very poor.It is described in present embodiment
The thickness of base layer 30 increases to provide enough matrix strengths and hardness, and the hardened layer 40 makes with the cooperation of the base layer 30
With so that the screen protecting film 100 takes into account wear-resisting property and ultrasonic wave penetration performance.
Referring to Fig. 3, further, the screen protecting film 100 is equipped with elastic cord breaker 51, the elastic cord breaker 51
It is laminated between the base layer 30 and the fitting glue-line 20, spread speed of the ultrasonic wave in the elastic cord breaker 51
Greater than 1700m/s.
In present embodiment, the material of the elastic cord breaker 51 be thermoplastic polyurethane elastomer rubber (TPU,
Thermoplasticpolyurethanes).Inventor be determined by experiment frequency be 12MHz ultrasonic wave in thermoplastic poly ammonia
Spread speed in ester elastomer rubber (TPU).Inventor also calculates the ultrasonic wave poly- to thermoplastic polyurethane elastic
Half-wavelength and 1/8th wavelength in body rubber (TPU).
Referring to Fig. 6, inventor is found through experiments that, the ultrasonic wave is big in the spread speed of the elastic cord breaker 51
In 1700m/s, propagation attenuation of the ultrasonic wave in the elastic cord breaker 51 is small, the thickness of the elastic cord breaker 51 with
The propagation attenuation of the ultrasonic wave is without obvious relation.Inventor is determined by experiment the ultrasonic fingerprint mould group 70 and cooperates screen
The signal-to-noise ratio that protective film 100 uses.As can be seen that right with a thickness of 50 μm, 75 μm and 100 μm of elastic cord breaker 51 (TPU layer)
The 100 part part of screen protecting film answered can obtain suitable signal-to-noise ratio (SNR is greater than 4), can satisfy ultrasonic fingerprint mould group
70 use demand.But if the thickness of elastic cord breaker 51 is less than the ultrasonic wave 1/8th of elastic cord breaker 51
Wavelength, it is possible to reduce the propagation attenuation of the ultrasonic wave, but the matrix strength that will lead to the screen protecting film 100 is low, and it can not
Meet the requirement such as fall protection performance and coating performance.Therefore, the thickness of the elastic cord breaker 51 is greater than the ultrasonic wave and exists
/ 8th wavelength in the elastic cord breaker 51 can take into account ultrasound so that the thickness of the elastic cord breaker 51 is moderate
Penetration performance and protective performance.Wherein, wavelength of the ultrasonic wave in the elastic cord breaker 51 is equal to the ultrasonic wave and exists
The ratio of the frequency of sound wave of spread speed and the ultrasonic wave in the elastic cord breaker 51.
If the thickness of elastic cord breaker 51 is substantially equal to the ultrasonic wave in the half-wavelength of elastic cord breaker 51, the bullet
Property buffer layer 51 can also play the role of resonance reinforce ultrasonic wave.But the elastic cord breaker 51 is blocked up, leads to screen protection
The hardness of film 100 is excessive, influences the coating performance of screen protecting film 100, and is unable to satisfy hot bending process requirement.Therefore, described
The thickness of elastic cord breaker 51 can be less than half-wavelength of the ultrasonic wave in the elastic cord breaker 51, and be greater than described super
/ 8th wavelength of the sound wave in the elastic cord breaker 51, so that the thickness of the elastic cord breaker 51 is moderate, the screen
Curtain protective film 100 can take into account coating performance, hot bending performance and ultrasonic penetration performance.
Since the material of the elastic cord breaker 51 is thermoplastic polyurethane elastomer rubber, it can determine that the elasticity is slow
The thickness for rushing layer 51 is greater than 25 μm, and less than 100 μm.In present embodiment, the elastic cord breaker 51 with a thickness of 50 μm, make
Obtaining the screen protection has enough matrix strengths, it is ensured that the screen protecting film 100 meets fall protection performance, patch
Close the requirement such as performance and hot bending shaping performance.In other embodiments, the thickness of the elastic cord breaker 51 is also not necessarily limited to
Citing is stated, can be configured according to actual needs.
Further, the hardness of the elastic cord breaker 51 is 85A-95A shore hardness or 55D-65D shore hardness.
Screen protecting film 100 is cooperated to use referring to Fig. 6, the ultrasonic fingerprint mould group 70 is determined by experiment in inventor
Signal-to-noise ratio.The elastic cord breaker 51 that hardness is 60A-70A shore hardness is labeled as soft TPU, hardness is 85A-95A shore
The elastic cord breaker 51 of hardness is labeled as middle TPU, and hardness is the elastic cord breaker 51 of 55D-65D shore hardness labeled as hard
TPU.As can be seen that in the case where other film layer group split-phases are same, the corresponding fingerprint mould of screen protecting film 100 with soft TPU
Group signal-to-noise ratio is less than the corresponding fingerprint mould group signal-to-noise ratio of screen protecting film 100 with middle TPU or hard TPU, i.e., the described ultrasonic wave
Propagation attenuation of the ultrasonic wave in middle TPU or hard TPU is significantly greater than in the propagation attenuation in soft TPU.Therefore, by the screen
The fitting glue-line 20 of curtain protective film 100 is set as middle TPU or hard TPU, i.e., the hardness of the described elastic cord breaker 51 is 85A-95A
Shore hardness or 55D-65D shore hardness, without guaranteeing that ultrasonic wave is protected in the screen by reducing thicknesses of layers
Intensity in cuticula 100.
Referring to Fig. 3, the screen protecting film 100 is equipped with optical adhesive layer 50, the optical adhesive layer 50 is laminated in the base
Between body layer 30 and the elastic cord breaker 51, and the optical adhesive layer 50 bonds the base layer 30 and the elastic cord breaker
51, the thickness of the optical adhesive layer 50 is less than 1/8th wavelength of the ultrasonic wave in the screen protecting film 100.It is described
The thickness of optical adhesive layer 50 can be 3 μm~5 μm.
Referring to Fig. 8, the embodiment of the present application also provides a kind of electronic equipment 300, the electronic equipment 300 includes display screen
Mould group 60 and ultrasonic fingerprint mould group 70, and screen protecting film 100 as described above, the screen protecting film 100 are bonded institute
Display screen module 60 is stated, the ultrasonic fingerprint mould group 70 is fixed on the display screen module 60 away from the screen protecting film
100 sides.The electronic equipment 300 further includes center 80 and mainboard 90.The center 80 is fixedly connected and carries the display
Shield mould group 60.The center 80 is equipped with accommodating space, and the mainboard 90 and the ultrasonic fingerprint mould group 70 are both secured to described
Accommodating space.The mainboard 90 is electrically connected the ultrasonic fingerprint mould group 70 and the display screen module 60.
It is understood that the electronic equipment 300 can be smart phone, smartwatch, tablet computer, notebook electricity
Brain or wearable smart machine.
Screen protecting film and electronic equipment provided by the embodiments of the present application are equipped with resonant layer by the screen protecting film,
And the resonant layer is equipped with the neighbouring first surface of the ultrasonic fingerprint mould group and the second surface of the relatively described first surface,
The resonant layer may make the ultrasonic wave that emits from the first surface towards the second surface with from the second surface towards institute
The ultrasonic wave superposition for stating first surface reflection generates resonance, reinforces the transmission intensity of ultrasonic wave, guarantees ultrasonic fingerprint identification effect
Fruit takes into account the screen protecting film so that the screen protecting film reduces ultrasonic attenuation without compressed thickness
Ultrasonic wave penetration performance, coating performance and mechanical property.
Although the preferred embodiment is not to limit in conclusion the application has been disclosed in a preferred embodiment above
The application, those of ordinary skill in the art are not departing from spirit and scope, can make various changes and profit
Decorations, therefore the protection scope of the application subjects to the scope of the claims.
Claims (16)
1. a kind of screen protecting film, which is characterized in that the screen protecting film is for being bonded display screen module, the display screen mould
Group is provided with ultrasonic fingerprint mould group away from the screen protecting film side, and the screen protecting film can pass through the ultrasonic wave and refer to
The ultrasonic wave of line mould group transmitting, the screen protecting film are equipped at least one resonant layer, at least one described resonant layer is equipped with neighbour
The nearly first surface of the ultrasonic fingerprint mould group and the second surface of the relatively described first surface, the resonant layer may make certainly
The first surface surpasses towards the ultrasonic wave that the second surface emits with from the second surface towards what the first surface reflected
Sound wave superposition generates resonance.
2. screen protecting film as described in claim 1, which is characterized in that the distance of the first surface to the second surface
Equal to half-wavelength of the ultrasonic wave in the resonant layer integral multiple and preset threshold and, wherein the ultrasonic wave exists
Wavelength in the resonant layer is equal to the sound wave frequency of spread speed of the ultrasonic wave in the resonant layer and the ultrasonic wave
The ratio of rate.
3. screen protecting film as claimed in claim 2, which is characterized in that the preset threshold is -5 μm+5 μm of ~.
4. screen protecting film as claimed in claim 2, which is characterized in that the screen protecting film is equipped with fitting glue-line, described
Screen protecting film is bonded display screen module through the fitting glue-line, and the fitting glue-line forms a resonant layer.
5. screen protecting film as claimed in claim 4, which is characterized in that the fitting glue-line is layer of silica gel, the joint adhesive
Layer with a thickness of 40 μm 50 μm of ~.
6. screen protecting film as claimed in claim 4, which is characterized in that the storage modulus of the fitting glue-line is 2000kPa
~ 3000kPa or 20000kPa ~ 30000kPa.
7. screen protecting film as claimed in claim 4, which is characterized in that the screen protecting film is equipped with base layer, the base
Body layer is arranged adjacent to the second surface, and with the joint adhesive layer stackup, and the thickness of the base layer is greater than the ultrasonic wave
/ 8th wavelength in the base layer, wherein wavelength of the ultrasonic wave in the base layer is equal to the ultrasound
The ratio of the frequency of sound wave of spread speed of the wave in the base layer and the ultrasonic wave.
8. screen protecting film as claimed in claim 7, which is characterized in that the thickness of the base layer is less than the ultrasonic wave and exists
Half-wavelength in the base layer.
9. screen protecting film as claimed in claim 8, which is characterized in that the material of the base layer is poly terephthalic acid second
Diol ester, the thickness of the base layer are greater than 25 μm less than 100 μm.
10. screen protecting film as claimed in claim 7, which is characterized in that the base layer forms another resonant layer.
11. screen protecting film as claimed in claim 7, which is characterized in that the screen protecting film is equipped with elastic cord breaker, institute
It states elastic cord breaker to be laminated between the base layer and the fitting glue-line, the thickness of the elastic cord breaker is greater than described super
/ 8th wavelength of the sound wave in the elastic cord breaker, wherein wavelength of the ultrasonic wave in the elastic cord breaker
Equal to the ratio of spread speed of the ultrasonic wave in the elastic cord breaker and the frequency of sound wave of the ultrasonic wave.
12. screen protecting film as claimed in claim 11, which is characterized in that the thickness of the elastic cord breaker is less than described super
Half-wavelength of the sound wave in the elastic cord breaker.
13. screen protecting film as claimed in claim 11, which is characterized in that the hardness of the elastic cord breaker is 85A-95A
Shore hardness or 55D-65D shore hardness.
14. screen protecting film as claimed in claim 12, which is characterized in that the material of the elastic cord breaker is thermoplastic poly
Urethane elastomer rubber, the thickness of the elastic cord breaker are greater than 25 μm less than 100 μm.
15. screen protecting film as claimed in claim 7, which is characterized in that the screen protecting film is equipped with hardened layer, described hard
Change is laminated on the base layer far from the fitting glue-line side layer by layer, and the thickness of the hardened layer is less than the ultrasonic wave described
/ 8th wavelength in screen protecting film.
16. a kind of electronic equipment, which is characterized in that the electronic equipment includes display screen module and ultrasonic fingerprint mould group, with
And the screen protecting film as described in 15 any one of claim 1 ~, the screen protecting film are bonded the display screen module, institute
It states ultrasonic fingerprint mould group and is fixed on the display screen module away from the screen protecting film side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910553938.9A CN110183993A (en) | 2019-06-24 | 2019-06-24 | Screen protecting film and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910553938.9A CN110183993A (en) | 2019-06-24 | 2019-06-24 | Screen protecting film and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110183993A true CN110183993A (en) | 2019-08-30 |
Family
ID=67723211
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910553938.9A Pending CN110183993A (en) | 2019-06-24 | 2019-06-24 | Screen protecting film and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110183993A (en) |
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| CN110673760A (en) * | 2019-09-25 | 2020-01-10 | 纳晶科技股份有限公司 | Screen handwriting film section bar and display device comprising same |
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Application publication date: 20190830 |