CN215264100U - Infrared-transmitting diffusion film applied to fingerprint module under screen - Google Patents
Infrared-transmitting diffusion film applied to fingerprint module under screen Download PDFInfo
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- CN215264100U CN215264100U CN202120113116.1U CN202120113116U CN215264100U CN 215264100 U CN215264100 U CN 215264100U CN 202120113116 U CN202120113116 U CN 202120113116U CN 215264100 U CN215264100 U CN 215264100U
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Abstract
The utility model discloses a be applied to infrared diffusion barrier that passes through of fingerprint module under screen, including the PET substrate layer, PET substrate layer top is equipped with the diffusion layer, PET substrate layer below is equipped with the functional layer, the diffusion layer includes first resin layer, organic particle, inorganic particle and inorganic powder are all mixed and are imbedded in first resin layer, first resin layer passes through the coating solidification in PET substrate layer top, organic particle inlays in first resin layer surface, the functional layer includes the second resin layer, second resin layer coating solidification is in PET substrate layer below. The utility model provides a be applied to infrared diffusion barrier that passes through of fingerprint module under screen when realizing that the infrared light pierces through, furthest's assurance visible light haze realizes fingerprint under LCD backlight screen.
Description
Technical Field
The utility model relates to a diffusion barrier technical field especially relates to a be applied to infrared diffusion barrier that passes through of fingerprint module under screen.
Background
The fingerprint identification scheme of smart mobile phone has capacitanc, ultrasonic wave formula etc. traditionally, along with user experience's impression, the use impression is all influenced because of physical structure reason including cell-phone side fingerprint identification to cell-phone back fingerprint identification in the past, and optical formula fingerprint identification scheme (fingerprint identification on the screen) begins to be applied in recent years, but most optical formula fingerprint is still being applied on high-end model by the technology, for example OLED display screen.
Along with the integral demand of full screen and cell-phone appearance design, the fingerprint identification module is hidden inside the whole machine and will be called the mainstream trend, therefore each fingerprint identification chip producer is working on developing hidden fingerprint identification technology under the LCD screen.
The backlight structure applied to the conventional LCD panel is as shown in fig. 1: the mobile phone backlight module comprises a mobile phone backlight iron frame 1, a mobile phone backlight LED lamp strip 2, a mobile phone backlight light guide plate 3, a mobile phone backlight diffusion film 4, a mobile phone backlight lower brightness enhancement film 5, a mobile phone backlight upper brightness enhancement film and a shading adhesive tape 6. However, the haze value of the conventional diffusion film in the current market is more than 95%, the transmittance of 940nm infrared light is less than 20%, although the higher haze value can ensure that people hide the fingerprint identification module below the screen when using the mobile phone screen, the transmittance of 940nm infrared light is lower, so that the fingerprint identification module cannot identify the fingerprint of people through the infrared light, and the fingerprint cannot be identified due to the fact that light is diffused in the using process.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a be applied to infrared diffusion film that passes through of fingerprint module under the screen, when realizing that the infrared light pierces through, furthest's assurance visible light haze realizes fingerprint under the LCD backlight screen.
The utility model discloses a be applied to technical scheme that infrared diffusion membrane that passes through of fingerprint module under screen adopted is:
the utility model provides a be applied to infrared diffusion membrane that passes through of fingerprint module under screen, includes the PET substrate layer, PET substrate layer top is equipped with the diffusion layer, PET substrate layer below is equipped with the functional layer, the diffusion layer includes first resin layer, organic particle, inorganic particle and inorganic powder are all mixed and are imbedded in first resin layer, first resin layer passes through the coating solidification in PET substrate layer top, organic particle inlays in first resin layer surface, the functional layer includes the second resin layer, second resin layer coating solidification is in PET substrate layer below.
Preferably, the first resin layer and the second resin layer are both two-component type hydroxyl acrylic resin.
Preferably, the relative molecular mass ranges of the first resin layer and the second resin layer are 13000-30000.
Preferably, a curing agent is added to both the first resin layer and the second resin layer.
Preferably, a diluting solvent is added to each of the first resin layer and the second resin layer, and the diluting solvent includes one or more of ethyl acetate, butyl acetate, PMA, DBE and isophorone.
Preferably, the weight percentage ratio of the raw materials of the diffusion layer is 110-100 of the first resin layer, 0.9-1 of the organic particles, 0.9-1 of the inorganic particles, 50-60 of the inorganic powder, 37-40 of the curing agent and 110-100 of the diluting solvent.
Preferably, the organic fine particles are one or a combination of two or more of a compound and a polymer having a single structure, and the average particle diameter of the organic fine particles is 1 to 5 μm.
Preferably, the surface of the second resin layer is further embedded with organic fine particles.
Preferably, the inorganic powder has a powder particle size of less than 100 nm.
Preferably, the inorganic fine particles have an average particle diameter of 0.01 to 1 μm, and one or a combination of zinc sulfide, titanium oxide, and barium sulfate is used as the inorganic fine particles.
The utility model discloses a be applied to beneficial effect of penetrating infrared diffusion barrier of fingerprint module under screen is: the diffusion layer comprises a first resin layer, organic particles, inorganic particles and inorganic powder, and the organic particles, the inorganic particles and the inorganic powder are fixed on the surface of the PET substrate layer through the first resin layer, so that visible light and infrared light penetrating through the functional layer and the PET substrate layer enter the diffusion layer. Therefore, the visible light is shielded by the organic particles, the inorganic particles and the inorganic powder, so that the visible light is scattered, the high haze of the diffusion film is ensured, and the diffraction capability of infrared light is strong, so that the infrared light is shielded less when passing through the organic particles, the inorganic particles and the inorganic powder, the infrared light has good penetrability, the visible haze is ensured to the maximum extent while the infrared light penetrates through the diffusion film, and the fingerprint under the LCD backlight screen is realized.
Drawings
FIG. 1 is a schematic diagram of a backlight structure of an LCD panel in the prior art;
FIG. 2 is a schematic structural diagram of an IR-transmitting diffusion film applied to an underscreen fingerprint module.
Detailed Description
The invention will be further elucidated and described with reference to the following embodiments and drawings in which:
referring to fig. 2, an infrared-transmitting diffusion film applied to a fingerprint module under a screen includes a PET substrate layer 10, a diffusion layer 20 is disposed above the PET substrate layer 10, and a functional layer 30 is disposed below the PET substrate layer 10.
The diffusion layer comprises a first resin layer 21, organic particles 22, inorganic particles 23 and inorganic powder 24, wherein the inorganic particles 23 and the inorganic powder 24 are mixed and embedded in the first resin layer 21, the first resin layer 21 is solidified above the PET substrate layer 10 through coating, and the organic particles 22 are embedded on the surface of the first resin layer 10. The functional layer 30 includes a second resin layer 31, and the second resin layer 31 is coated and cured under the PET substrate layer 10.
The diffusion layer 20 includes a first resin layer 21, organic fine particles 22, inorganic fine particles 23, and inorganic powder 24, and the organic fine particles 22, the inorganic fine particles 23, and the inorganic powder 24 are fixed to the surface of the PET substrate layer 10 by the first resin layer 21, so that visible light and infrared light passing through the functional layer 30 and the PET substrate layer 10 enter the diffusion layer 20.
Therefore, the organic particles 22, the inorganic particles 23 and the inorganic powder 24 are used for shielding visible light, so that the condition that the visible light is scattered is ensured, and the high haze of the diffusion film is ensured.
In the scheme, the first resin layer 21 and the second resin layer 31 are both two-component type hydroxyl acrylic resin, and the relative molecular mass range of the first resin layer 21 and the second resin layer 31 is 13000-30000.
The hydroxyl acrylic resin is not particularly limited as long as it is a hydroxyl acrylic resin generally classified as a hydroxyl acrylic resin. The relative molecular mass range of the hydroxyl acrylic resin is preferably 13000-30000, and more preferably 14000-30000. When the viscosity average relative molecular mass is less than 13000, the strength of the diffusion film is insufficient, which easily causes the inorganic powder 24 to precipitate in the coating; when the viscosity average relative molecular mass exceeds 30000, the coating material has a high viscosity and is difficult to coat.
And a curing agent is added to both the first resin layer 21 and the second resin layer 31, and the hydroxy acrylate resin is a two-component type, is used in combination with the curing agent, and is cured by heating after the coating is completed. The curing agent can be Bayer N3390.
The first resin layer 21 and the second resin layer 31 are both added with a diluting solvent, and the diluting solvent comprises one or more of ethyl acetate, butyl acetate, PMA, DBE and isophorone. The coating materials of the first resin layer 21 and the second resin layer 31 are applied with the diluent solvent, and the viscosity and the drying speed are adjusted. The diluent solvent component can be used alone in 1 kind, can also be mixed with 2 or more, but in the actual production process, in order to obtain a good coating effect, usually the diluent solvent will use 2 or more mixed use.
The weight percentage ratio of the materials of the diffusion layer 20 is 110-100 of the first resin layer, 0.9-1 of the organic particles, 0.9-1 of the inorganic particles, 50-60 of the inorganic powder, 15-17 of the curing agent, 110-100 of the diluting solvent. The preferable ratio is 100 of the first resin layer, 1 of the organic fine particles, 1 of the inorganic fine particles, 50 of the inorganic powder, 15 of the curing agent and 100 of the diluting solvent.
The functional layer comprises the following raw materials in percentage by weight: diluent 45: organic particles 30: and (3) a curing agent 15.
In addition, although inorganic fine particles and inorganic powder may be added to the functional layer, the obtained shielding effect is not significant when the functional layer is added, and therefore, in this embodiment, the inorganic fine particles and the inorganic powder are not added to the functional layer, but the inorganic fine particles and the inorganic powder may be added to the functional layer according to actual requirements during an actual production process.
The organic fine particles 22 are one or a combination of two or more of a compound and a polymer having a single structure, and the organic fine particles 22 have an average particle diameter of 1 to 5 μm, with a preferred size of 5 μm. If the average particle diameter of the organic fine particles 22 is larger than 5 μm, the local particles are more prominent to form a visual black spot, which affects the use effect of the diffusion film.
The organic particles 22 are embedded in the surface of the second resin layer 31, and when the diffusion film is mounted and used, the organic particles 22 on the second resin layer 31 can play a role in spacing to prevent the diffusion film from being attached to a lower brightness enhancement film or a light guide plate.
The particle size of the inorganic powder 24 is smaller than 100nm, and when the particle size of the inorganic powder 24 is smaller than 100nm, the shielding effect at 940nm of infrared light is poor, and the infrared light is shielded to a certain extent, so that the infrared light can be well transmitted and the visible haze can be increased in the using process, and therefore, the relative molecular mass of the hydroxyl acrylic resin needs to be controlled, so that the diffusion film has good infrared light transmittance and visible haze.
The inorganic fine particles 23 preferably have an average particle diameter of 0.01 to 1 μm, and one or a combination of two or more of zinc sulfide, titanium oxide, and barium sulfate is used as the inorganic fine particles 23. Among these, titanium oxide is preferable, and 1 kind of the inorganic fine particles 23 may be used alone or 2 or more kinds may be used in combination. The average particle diameter of the inorganic fine particles 23 is more preferably 0.1 to 0.5. mu.m. When the average particle size of the inorganic fine particles 23 is 1 μm or more, the total light transmittance is lowered and sufficient illumination intensity cannot be obtained, and therefore, it is avoided that the average particle size of the inorganic fine particles 23 is too large to affect the viewing of the screen of the mobile phone by people.
The light diffusibility and infrared transmittance of the diffusion film of the above embodiment are significantly improved. Therefore, the light diffusion plate is suitable for use as a backlight of a display device, particularly a light diffusion plate of a direct type backlight. Here, the excellent light diffusibility means that light from the light source is diffused more when passing through the diffusion film. Since the refractive index of PMMA particles or PS material particles used in conventional diffusion is greater than 1.49, the infrared light wavelength is 940nm, the higher the diffraction ability of light, but the weaker the penetration ability, when the microstructure of the diffusion surface is rough, the larger the refraction angle of light, the refraction of infrared light can be caused, and in order to keep visible light having haze, the way that the infrared haze is smaller is mainly considered in several points:
when only the organic fine particles 22 or the inorganic fine particles 23 are used, light diffusibility and light source shape-shielding property are improved and haze is maximized as compared with the case where the organic fine particles 22 and the inorganic fine particles 23 are used together.
When the organic fine particles 22 and the inorganic fine particles 23 are used together, if the amount of the organic fine particles 22 is too small, light diffusibility and light source shape shielding property are lowered, and if the amount of the organic fine particles 22 is too large, light transmittance is lowered. If the amount of the inorganic fine particles 23 is too small, light diffusibility and light source shape shielding property cannot be improved, and if the amount of the inorganic fine particles 23 is too large, light transmittance is lowered. In consideration of these circumstances, it is considered that the organic fine particles 22 and the inorganic fine particles 23 are blended at a predetermined mass ratio, and contribute to improvement of light diffusibility, light source shape-shielding property, and the like.
By the proportion, the diffusion film with the 940nm infrared light transmittance of more than 50 percent and the visible light haze of more than 70 percent can be realized. The proportion implementation table of each raw material of the functional layer is as follows:
| sequence of steps Number (C) | Inorganic micro Granule (g) | Inorganic powder Body (g) | Organic micro Granule (g) | Diluting solution Agent (g) | Curing agent （g） | Hydroxy propyl ester Olefine acid tree Fat (g) | 550nm Infrared light （%） | 940nm Infrared light （%） | 850nm Infrared light （%） | Visible light Light transmittance （%） | Haze of visible light （%） |
| 1 | 0.1 | 5 | 0.1 | 10 | 1.5 | 10 | 12 | 55 | 45 | 56.87 | 80.57 |
| 2 | 0.2 | 5 | 0.1 | 10 | 1.5 | 10 | 10 | 50 | 38 | 56 | 85.28 |
| 3 | 0.2 | 5 | 0.2 | 10 | 1.5 | 10 | 7.6 | 45 | 34 | 54.57 | 88.19 |
| 4 | 0.2 | 5 | 0.5 | 10 | 1.5 | 10 | 6.5 | 38 | 27 | 54.69 | 90.17 |
The utility model provides a be applied to infrared diffusion barrier that passes through of fingerprint module under screen, diffuse layer are including first resin layer, organic particle, inorganic particle and inorganic powder, fix organic particle, inorganic particle and inorganic powder on the surface of PET substrate layer through first resin layer to the visible light and the infrared light that make and pass functional layer and PET substrate layer enter into the diffuse layer. Therefore, the visible light is shielded by the organic particles, the inorganic particles and the inorganic powder, so that the visible light is scattered, the high haze of the diffusion film is ensured, and the diffraction capability of infrared light is strong, so that the infrared light is shielded less when passing through the organic particles, the inorganic particles and the inorganic powder, the infrared light has good penetrability, the visible haze is ensured to the maximum extent while the infrared light penetrates through the diffusion film, and the fingerprint under the LCD backlight screen is realized.
It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. The utility model provides a be applied to infrared diffusion membrane that passes through of fingerprint module under screen, includes the PET substrate layer, PET substrate layer top is equipped with the diffusion layer, PET substrate layer below is equipped with the functional layer, a serial communication port, the diffusion layer includes first resin layer, organic microparticle, inorganic microparticle and inorganic powder are all mixed and are imbedded in first resin layer, first resin layer passes through the coating solidification in PET substrate layer top, organic microparticle inlays in first resin layer surface, the functional layer includes the second resin layer, second resin layer coating solidification is in PET substrate layer below.
2. The infrared-transmitting diffusion film for an underscreen fingerprint module of claim 1, wherein the first resin layer and the second resin layer are both hydroxyl acrylic resins.
3. The infrared-transmitting diffusion film applied to an underscreen fingerprint module as claimed in claim 2, wherein the relative molecular mass ranges of the first resin layer and the second resin layer are both 13000-30000.
4. The infrared-transmitting diffusion film applied to the underscreen fingerprint module as claimed in claim 3, wherein a curing agent is added into each of the first resin layer and the second resin layer.
5. The infrared-transmitting diffusion film applied to an underscreen fingerprint module as claimed in claim 1, wherein organic particles are embedded in the surface of the second resin layer.
6. The infrared-transmitting diffusion film applied to an underscreen fingerprint module as claimed in claim 1, wherein the powder particle size of the inorganic powder is less than 100 nm.
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| CN202120113116.1U CN215264100U (en) | 2021-01-15 | 2021-01-15 | Infrared-transmitting diffusion film applied to fingerprint module under screen |
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| CN112859217A (en) * | 2021-01-15 | 2021-05-28 | 深圳市长松科技有限公司 | Infrared-transmitting diffusion film applied to fingerprint module under screen |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112859217A (en) * | 2021-01-15 | 2021-05-28 | 深圳市长松科技有限公司 | Infrared-transmitting diffusion film applied to fingerprint module under screen |
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