CN210796308U

CN210796308U - Fingerprint unblock 3D screen protection film under screen with high ductility

Info

Publication number: CN210796308U
Application number: CN201920462110.8U
Authority: CN
Inventors: 刘少飞; 周艺飞
Original assignee: Dongguan Saiyue New Material Technology Co ltd
Current assignee: Dongguan Saiyue New Material Technology Co ltd
Priority date: 2019-04-08
Filing date: 2019-04-08
Publication date: 2020-06-19
Anticipated expiration: 2029-04-08

Abstract

The utility model discloses a fingerprint unblock 3D screen protection film under screen with high ductility, be less than 20 modified transparent PC film and TPU coating including the phase difference, this TPU coating is that direct coating combines on PC film surface. As the PC film has high hardness and good wear resistance, the PC film is not easy to scratch when used as a substrate of a protective film. In addition, the PC film has extremely low phase difference, high transmittance and low haze, and is suitable for unlocking the finger marks under the screen. And the TPU has no phase difference, and is coated on a PC film, so that the phase difference of the original film is not influenced, and the accuracy of fingerprint unlocking is ensured. In addition, the TPU coating is elastic, and high stretchability of the protective film is realized, so that the finished protective film can be pasted with a 3D curved screen radian screen. And because of the super hydrophobic and oleophobic effect of TPU, the mobile phone can slide on the mobile phone protective film, so that almost no trace is left, and self-cleaning is realized.

Description

Fingerprint unblock 3D screen protection film under screen with high ductility

Technical Field

The utility model belongs to the technical field of the cell-phone protection film technique and specifically relates to indicate fingerprint unblock 3D screen protection film and forming method under screen with high ductility.

Background

The fingerprint unlocking and identification are completed below the screen glass, and the process of fingerprint identification is achieved by mainly utilizing infrared or optical technology through different materials. Light is a transverse wave, the propagation direction of the transverse wave is consistent with the vibration direction, and factors influencing the transmittance include the following points:

1. interference of light: the N light waves are mutually superposed when meeting in the space, are always enhanced in certain regions and are always weakened in other partial regions, so that a stable intensity distribution phenomenon can be caused.

2. Polarization of light: the phenomenon that the spatial distribution of the wave vector vibration loses symmetry with respect to the propagation direction of light.

3. Scattering (reflection) of light: when light passes through the inhomogeneous medium, part of the light beam deviates from the original direction and spreads dispersedly.

Based on the above, the materials with better light permeability in the market at present comprise COP, PC, TAC, SRF and common PET, wherein the COP, PC and TAC solve the problems of light interference and light polarization, but the materials have the insurmountable defects that the COP is amorphous, the PC is a linear molecule and has no light orientation and low phase difference, and the problem of fingerprint identification sensitivity reduction caused by the light interference and the light polarization can be perfectly avoided.

Therefore, COP, PC, TAC, SRF and ordinary PET cannot be used individually as finished products of protective films for cellular phones. It is necessary for those skilled in the art to develop a protective film for a mobile phone having high strength and light transmittance and suitable for fingerprint unlocking.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model discloses to the disappearance that prior art exists, its main objective provides a fingerprint unblock 3D screen protection film under screen with high ductility, and it uses modified PC as the base film, has high strength, and hardness >2H, and directly combines the TPU coating on PC with the mode of coating in addition, utilizes TPU elasticity and the characteristic of no phase difference, can not influence the phase difference of protection film after the coating, has guaranteed fingerprint unblock function under the screen to overcome prior art's not enough.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

A3D screen protection film with high ductility for unlocking fingerprints comprises a modified transparent PC film with a phase difference of less than 20 and a TPU coating, wherein the TPU coating is directly coated and combined on the surface of the PC film.

Preferably, the thickness of the PC film is 50mm, 80 mm or 100 mm, and the thickness of the TPU coating is 500-100 mm.

Preferably, the shape of the high-ductility lower finger print unlocking 3D screen protection film is matched with that of a mobile phone screen, the high-ductility lower finger print unlocking 3D screen protection film comprises a middle area and an edge area, the middle area is arched upwards to form an arc shape, and the edge area extends downwards to form a boundary.

Preferably, the TPU coating is a surface layer of the protective film, the modified transparent PC film is an intermediate layer of the protective film, and an adhesive layer and release paper are sequentially attached to the bottom surface of the modified transparent PC film.

Compared with the prior art, the utility model obvious advantage and beneficial effect have, particularly, can know by above-mentioned technical scheme, the utility model discloses a 3D screen protection film adopts a phase difference to be less than 20 modified transparent PC film as the basement, directly coats the TPU coating at PC film surface again. Since the PC film has high hardness (hardness > 2H) and good wear resistance (1000 g/500 times), the PC film is not easy to scratch as a substrate of a protective film. In addition, the PC film has extremely low phase difference (the phase difference is less than 20), high transmittance and low haze (T is more than or equal to 92 percent, and H is less than or equal to 0.6), and is suitable for unlocking fingerprints under the screen. And the TPU coating has elasticity, so that the high stretchability of the protective film is realized, and the finished protective film can be pasted with a 3D curved screen radian screen. In addition, the TPU has no phase difference, and is coated on the PC film, so that the phase difference of the original film cannot be influenced, and the accuracy of fingerprint unlocking is ensured. And because TPU super hydrophobicity (theta is more than or equal to 110 degrees) oleophobic effect (fingerprint oil stain prevention), the mobile phone can slide on the mobile phone protective film, almost no trace is left, and the self-cleaning effect is realized.

To illustrate the structural features and functions of the present invention more clearly, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Drawings

Fig. 1 is a cross-sectional view of a 3D screen protection film according to an embodiment of the present invention.

Fig. 2 is a schematic view of a layered structure of a 3D screen protection film according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a TPU coating apparatus according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a coating mechanism of the TPU coating apparatus according to the embodiment of the present invention.

The attached drawings indicate the following:

100. middle region 200, edge region

10. PC film 20, TPU coating

30. Adhesive layer 40 and release paper

50. Coating mechanism 51 and crack head

52. Coating roll 53, comma doctor blade

54. Feeding tank 60 and oven

70. And (7) winding the roller.

Detailed Description

Referring to fig. 1 and 2, a specific structure of a preferred embodiment of the present invention is shown, which is a 3D screen protection film with high ductility for unlocking finger marks under a screen, including a modified transparent PC film 10 with a retardation of less than 20 and a TPU (thermoplastic polyurethane resin) coating, wherein the TPU coating 20 is directly coated and bonded on the surface of the PC film 10. In this embodiment, the TPU coating 20 is a surface layer of the protective film, the modified transparent PC film 10 is an intermediate layer of the protective film, and the adhesive layer 30 and the release paper 40 are sequentially attached to the bottom surface of the modified transparent PC film 10.

Wherein, the thickness of the PC film 10 is 50mm, 80 mm or 100 mm, and the thickness of the TPU coating 20 is 500-100 mm. In this embodiment, the modified transparent PC film 10 has a refractive index of 1.585, a light transmittance of 95%, an impact strength value of 140 j/M, a rockwell hardness of 77M scale, a flexural modulus of 2230 Mpa, a tensile yield point of 61 Mpa, a tensile fracture point of 140Mpa, and a phase difference of 12. The modified transparent PC film 10 can be manufactured by purchasing a modified PC material from Japan. The utility model discloses the people melts the modified PC material of Japan imperial who will purchase back, modifies through nanometer silver antibacterial material again to obtain the modified PC material of nanometer silver antibacterial material, can effectively exterminate the activity with bacterial communities such as staphylococcus aureus, escherichia coli and candida albicans. The PC film 10 has good light transmittance, high mechanical strength, impact resistance and high refractive index. In addition, since PC is a linear molecule, it has no orientation of light, has a low phase difference, and can perfectly avoid the problem of deterioration of fingerprint recognition sensitivity due to interference and polarization of light. However, the single PC film 10 is not resistant to strong acid, strong alkali, and ultraviolet rays, and thus needs to be combined with other functional films to enhance the function of the protective film.

The utility model discloses a protection film is not 2D screen protecting film, and is not 2.5D screen protecting film also, is a 3D screen protection film, and its shape is identical with cell-phone 3D screen, including middle zone 100 and border region 200, this middle zone 100 upwards arches for the arc, and this border region 200 downwardly extending forms the border to can laminate completely with cell-phone 3D screen.

As shown in fig. 3 and 4, the utility model discloses a realize the production preparation of above product, provide a forming method of fingerprint unblock 3D screen protection film under the screen that has high ductility, include following step:

step 1, taking the modified transparent PC film 10 with the phase difference of less than 20, and winding the modified transparent PC film 10 into a PC material roll;

2, placing one end of a PC material roll into a coating machine for traction and expansion, and winding the other end of the PC material roll on a winding roll 70 of the coating machine to be wound after passing through a coating mechanism 50 and an oven 60;

step 3, heating the prepared TPU slurry by using a heating cylinder, pumping the heated TPU slurry into a heated crack head 51, spraying the TPU slurry from the crack head to flow into a feeding groove 54, directly winding the SRF film on a coating roller 52, dragging the SRF film by the coating roller 52, directly coating the TPU slurry on the SRF film, leveling the TPU slurry by a comma scraper 53, and ensuring the thickness of a coating wet film on the coating roller 52 by a gap between the comma scraper 53 and the coating roller 52;

and step 4, the PC film 10 coated with the TPU slurry enters an oven 60, the organic solvent in the TPU slurry volatilizes after reaching a volatilization point, and the TPU slurry is thermoplastically formed into a film and is attached to the surface of the PC film 10.

In the step 1, the modified transparent PC film 10 has a refractive index of 1.585, a light transmittance of 95%, an impact strength value of 140 j/M, a Rockwell hardness of 77M, a flexural modulus of 2230 MPa, a tensile yield point of 61 MPa, a tensile fracture point of 140MPa, and a phase difference of 12. The modified transparent PC film 10 is a PC material body modified by nano antibacterial materials.

In the 3 rd step, the TPU sizing agent is prepared by dissolving the modified TPU in a high-polarity organic solvent, and controlling the viscosity at 800-.

After the 4 th step, the following steps are required

Step 5, coating a silica gel layer on the surface of the TPU film, and finally attaching a release film;

step 6, cutting the large piece, and then cutting the large piece into strips;

step 7, manufacturing a sheet, namely manufacturing the pole piece into a single pole piece;

and 8, shaping, namely shaping the single pole piece into a finished product of the 3D protective film.

The finished product obtained in the above steps is tested by experiments to obtain the following data, see table 1.

Table 13D performance testing of screen protective films

Therefore, the utility model discloses a 3D screen protection film has PC's rigidity and TPU's pliability, has lower phase difference again (the phase difference <20), and the luminousness is high, and the light stability is good, has good bias light effect, and fingerprint sensitivity is high under the screen.

The utility model discloses a forming method of fingerprint unblock 3D screen protection film under screen with high ductility to solution film-forming method, with modified TPU (thermoplastic polyurethane resin) dissolve in high polarity organic solvent, utilize the coating of accurate coating equipment on specific PC membrane material surface, under the oven temperature parameter of difference, organic solvent volatilizes after reaching the volatilization point in the system, the thermoplastic film-forming of polyurethane resin. The TPU film is directly coated and combined on the surface of a PC film, so that the TPU film is uniform in thickness, dry and comfortable in surface and good in interlayer adhesion after being formed into the film. The method replaces the traditional mode of directly pasting and compounding by TPU, avoids a dielectric layer between the TPU film and the PC film, is more convenient to manufacture, and has better quality of finished products. And moreover, the phase difference of the PC is less than 20, and as the TPU is precisely coated and does not have biaxial tension, and polyurethane molecules have no polarization tendency, the high phase difference characteristic of the PC is not changed, the overall phase difference of the film material is higher, and the unlocking requirement of the finger print under the screen can be met. And (3) coating and combining the TPU film and the PC film to obtain the mobile phone protective film with high stretchability and high mechanical strength.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any slight modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.

Claims

1. The utility model provides a fingerprint unblock 3D screen protection film under screen with high ductility which characterized in that: the PC film comprises a modified transparent PC film (10) with the phase difference smaller than 20 and a TPU coating (20) without the phase difference, wherein the TPU coating (20) is directly coated and combined on the surface of the PC film (10), the shape of the high-ductility under-screen fingerprint unlocking 3D screen protection film is matched with that of a mobile phone screen, the PC film comprises a middle area (100) and an edge area (200), the middle area (100) is arched upwards to form an arc shape, and the edge area (200) extends downwards to form a boundary.

2. The underscreen fingerprint unlocking 3D screen protection film with high ductility according to claim 1, wherein: the TPU coating (20) is a surface layer of the protective film, the modified transparent PC film (10) is a middle layer of the protective film, and the bottom surface of the modified transparent PC film (10) is sequentially pasted with an adhesive layer (30) and release paper (40).