CN208902907U - Optical film, fingerprint identification device and lighting screen body - Google Patents

Abstract

This application discloses a kind of optical film, fingerprint identification device and lighting screen bodies；Optical film includes the substrate layer, filter layer and protective layer for being sequentially overlapped setting；Light transmission hole is formed by light absorbent on the filter layer.The application above the identification of fingerprint module of whole plane light source by being provided with the optical film of grid layer, allow optical finger print identification module in identification, so that only special angle light irradiates fingerprint, the light of other angles is filtered, the leakage problem in finger touch area when solving the identification of existing planar light source fingerprint Identification sensor；Simultaneously by be arranged on planar light source optical film improve different perspectives due to optics is coupled or light passes through transparent medium when the colour cast problem that generates.

Description

Optical film, fingerprint identification device and lighting screen body

Technical field

The present disclosure relates generally to optical fingerprint identification technology field more particularly to a kind of optical film, fingerprint identification device and Lighting screen body.

Background technique

Mainstream technology has a 1. capacitance type fingerprint identification techniques to identification of fingerprint technology now, 2. optical fingerprint identification techniques, 3. ultrasonic fingerprint recognizes.Wherein condenser type has advantage small in size at present, is widely used among mobile device, such as: mobile phone, Notebook, tablet computer etc..But requirement in identification itself is more harsh, the reason is that because sensor is identification " electricity Hold " signal, because the difference of height of fingerprint has different signals to reach discriminating function when generating from sensor contacts, when finger has tide It is wet, slight it is dirty under conditions of, be likely to allow identification to fail or erroneous judgement.Ultrasonic fingerprint identification at present for smartphone or Mobile device uses, and feature is that can be directed through display and touch-control module, realizes and shields lower finger print identification function.

It is recognized using optical fingerprint, accuracy rate is higher, but existing optics framework needs one piece of prism as standard module Part (purpose control light source path) is extremely difficult to the target of slimming, therefore it is mostly fixed fingerprint identification system that application is upper.

Due to calculating the progress of technology, the identification of whole plane optical finger print gradually moves to maturity, and avoids optical finger print identification Needing to control optical path in advance is single or controllable problem, is allowed containing self-emitting light source OLED, LED, mini-LED, micro-LED Light film touch-control module be not required to consider optical path (this light source single directivity is low), but whole plane optical finger print identification asked there are several Finger touch area can light leakage when 1. identification of topic；2. this thin type optical fingerprint recognizes module because light penetrates transparent medium or optics Coupling causes the colour cast problem of different perspectives.Problems will affect production stability.Meanwhile planar light source be applied to car light and When special lighting lamp field, there is certain requirement to the light direction of light source, for example automobile tail light needs the light of light source should not Too dispersion or light direction are vehicle dead astern as far as possible.So needing to be defined the direction of the launch of light.

Summary of the invention

In view of drawbacks described above in the prior art or deficiency, being intended to provide one kind can improve because different perspectives is due to optics The optical film of coupling or light by the colour cast problem of transparent medium, and fingerprint identification device and illumination using the optical film Shield body.

First aspect the application provides a kind of optical film, which includes the substrate layer for being sequentially overlapped setting, filter layer And protective layer；The filter layer is formed by being spaced to be coated on substrate layer and form the light absorbent of light transmission hole.

According to technical solution provided by the embodiments of the present application, the width d of the light transmission hole is less than or equal to height h.

According to technical solution provided by the embodiments of the present application, the light absorbent is penetration below 20% or reflectivity In 30% impermeable stimulative substance below.

According to technical solution provided by the embodiments of the present application, the substrate layer is made of glass or resin.

According to technical solution provided by the embodiments of the present application, the protective layer is optical coating or cover sheet.

According to technical solution provided by the embodiments of the present application, the material of the optical coating include antireflection material, resist it is dirty At least one of dirty material, anti scuffing material or transparent optical functional material.

According to technical solution provided by the embodiments of the present application, filled with translucent material or be air in the light transmission hole.

According to technical solution provided by the embodiments of the present application, the light transmission hole is the geometry of regular array；It is described Geometry is any one in round or polygon.

Second aspect, the application provide a kind of fingerprint identification device, including the signal sensing module and light source being superposed The side of transmitting module, the separate light source emitting module of the signal sensing module is equipped with any one of the above optical film；

The light source emitting module is configured to, and provides original to the finger touched on optical film across signal sensing module Beginning light source；

The signal sensing module is configured to, and receives the original light source handling digital reflex and filtering through optical film.

The third aspect, the application also provide a kind of lighting screen body, are arranged above-mentioned on the light emitting module of the lighting screen body It anticipates a kind of optical film.

According to technical solution provided by the embodiments of the present application, when optical film is applied in above-mentioned fingerprint identification device, car light screen When being filled with translucent material when body and lighting screen body, and in the light transmission hole of optical film, the translucent material is in the light Learn the fingerprint identification device of film application, the penetration of effective band of operation of car light screen body or lighting screen body is greater than 70%.

The application allows optics by being provided with the optical film of grid layer above the fingerprint identification device of whole plane light source Identification of fingerprint module is in identification, so that only special angle light irradiates fingerprint, the light of other angles is filtered, solved The leakage problem in finger touch area when existing planar light source fingerprint Identification sensor identifies；Simultaneously by being set on planar light source Different perspectives can be improved since optics is coupled or light is by the colour cast problem generated when transparent medium by setting optical film, prevent this Planar light source, which is applied to special lighting field, disperses beam projecting direction excessively.

Detailed description of the invention

By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is other Feature, objects and advantages will become more apparent upon:

Fig. 1 is the schematic cross-sectional view of the first embodiment of the application；

Fig. 2 is the schematic cross-sectional view of second of embodiment of the application；

Fig. 3 is the overlooking structure diagram of second of embodiment of the application；

Fig. 4 is the overlooking structure diagram of the third embodiment of the application；

Fig. 5 is the overlooking structure diagram of the 4th kind of embodiment of the application；

Fig. 6 is the overlooking structure diagram of the 5th kind of embodiment of the application；

Fig. 7 is the overlooking structure diagram of the 6th kind of embodiment of the application；

Fig. 8 is the overlooking structure diagram of the 7th kind of embodiment of the application；

Figure label:

10, substrate layer；20, filter layer；30, protective layer；21, light transmission hole；40, light source emitting module；50, signal sensing Module.

Specific embodiment

The application is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched The specific embodiment stated is used only for explaining related invention, rather than the restriction to the invention.It also should be noted that in order to Convenient for description, part relevant to invention is illustrated only in attached drawing.

It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

Please referring to Fig. 1 is a kind of the schematic diagram of the section structure of the first embodiment of optical film of the application, which includes It is sequentially overlapped the substrate layer 10, filter layer 20 and protective layer 30 of setting；The filter layer 20 is coated on substrate layer 10 by interval And the light absorbent for forming light transmission hole is formed.

In the present embodiment, the substrate layer 10 is made of glass, and in other embodiments, the substrate layer 10 can also be with It is formed from a resin.

In the present embodiment, the protective layer 30 is optical coating, and in other embodiments, the protective layer 30 can also be with For cover sheet.

In the present embodiment, it is filled with translucent material in the light transmission hole 21, in other embodiments the loophole It can be air in hole.

Please referring to Fig. 2 is a kind of structural schematic diagram of the fingerprint identification device of optical film of the application, the fingerprint identification device Including optical film described in light source emitting module 40, signal sensing module 50 and the embodiment one successively arranged from bottom to up.Institute It states light source emitting module configuration 40 to be used for, provides primary light to the finger touched on optical film 10 across signal sensing module Source；

In the present embodiment, the signal sensing module 50 is configured to, and reception is handled digital reflex and filtered through optical film Original light source.

In the present embodiment, signal sensing module 50 specifically can be using the sensing of existing optical finger print in the prior art The sensor chip of device is realized.

As shown in figure 3, in the overlooking structure diagram of the optical film of second of embodiment of the application, the loophole Hole is the rectangle of array arrangement, so that the optical film is striated.

In above-mentioned Fig. 3, the identification of fingerprint of fingerprint identification device can be 2 θ, the height h of light transmission hole using angular field of view Determine that the size of θ, the relationship between three are with width d

Tan (θ)=d/h enters light quantity needed for identification of fingerprint and determines the size of 2 θ, therefore also determines light transmission hole Size and height relationships, designer can design the light transmission hole of filter layer according to this relationship.

Preferably, the width d of the light transmission hole is less than or equal to height h.The width d of light transmission hole refers to light transmission hole The width of the widest part；The width d of light transmission hole is less than or equal to height h, so that the angular field of view of light transmission hole is less than or equal to 45 degree, The problem of light leakage can be better solved.

In the above-described embodiments, penetration of the translucent material in effective band of operation of the fingerprint Identification sensor Greater than 70%, to guarantee not influencing the bright demand of fingerprint recognition.Such as the luminescence band of white light source is 400-700nm, then Translucent material is greater than 70% to the penetration degree of the light of effective band of operation (i.e. wavelength is 400-700nm wave band) at this time.

In the above-described embodiments, optical film has light emission direction feature, as x-axis direction has control visual angle and light leakage function Can, but vertical 90 degree of y-axis direction does not have this function.The light transmission hole 21 may be other in other embodiments The geometry of regular array, such as array arrangement are rectangular, round.

As shown in figure 4, in the overlooking structure diagram of the optical film of the third embodiment of the application, the loophole Hole 21 is the square of array arrangement.

As shown in figure 5, in the overlooking structure diagram of the optical film of the 4th kind of embodiment of the application, the loophole Hole 21 is the circle of array arrangement.

As shown in fig. 6, in the overlooking structure diagram of the optical film of the 5th kind of embodiment of the application, the loophole Hole 21 is the equilateral triangle of regular array.

As shown in fig. 7, in the overlooking structure diagram of the optical film of the 6th kind of embodiment of the application, the loophole Hole 21 is the regular pentagon of regular array.

As shown in figure 8, in the overlooking structure diagram of the optical film of the 7th kind of embodiment of the application, the loophole Hole 21 is the regular hexagon of regular array.

It should be noted that light transmission hole selects the length of the most width position of geometric figure as width d when being non-circular.

In the third above-mentioned embodiment into the 7th kind of embodiment, optical film is provided with control visual angle in x-axis and y-axis direction And filtering functions, that is to say, that periodic geometry hole all has control visual angle and filtering functions in the direction x and y.

In other embodiments, the light transmission hole 21 or other geometries, or can be irregular shape, As long as can achieve the purpose of design with filtering functions at visual angle.

In the above-described embodiments, the light absorbent is that penetration is below 20% or reflectivity is in 30% black below Or dark matter.

Preferably, the material of the optical coating includes antireflection material, resists dirty material, anti scuffing material or transparent light Learn at least one of functional material.

Preferably, a kind of car light screen body that the 8th kind of embodiment of the application provides, the light emitting module of the car light screen body Above-described embodiment one or three is equipped with to eight any one optical films；

By the use of this kind of optical film, the light that can limit lighting screen body is projected from special angle, reduces light to week There is requirement to the angle that goes out to set of light in the scattering enclosed, especially vehicle light illumination screen, in addition, also depositing in general illumination screen body In light scattering and the problem of colour cast.

Those skilled in the art is it is contemplated that optical film provided herein is not exclusively for use on car light screen body, also Can be on any other lighting screen body, such as indoor wall lamp screen body, outdoor indicator light screen body etc..

Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.Those skilled in the art Member is it should be appreciated that invention scope involved in the application, however it is not limited to technology made of the specific combination of above-mentioned technical characteristic Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature Any combination and the other technical solutions formed.Such as features described above has similar function with (but being not limited to) disclosed herein Can technical characteristic replaced mutually and the technical solution that is formed.

Claims (10)

1. a kind of optical film, it is characterised in that: substrate layer, filter layer and protective layer including being sequentially overlapped setting；The optical filtering Layer is formed by being spaced to be coated on substrate layer and form the light absorbent of light transmission hole.

2. optical film according to claim 1, it is characterised in that: the width d of the light transmission hole is less than or equal to height h.

3. optical film according to claim 2, which is characterized in that the light absorbent is that penetration is below 20% or anti- Rate is penetrated in 30% impermeable stimulative substance below.

4. according to claim 1 to optical film described in 3 any one, which is characterized in that the protective layer be optical coating or Cover sheet.

5. optical film according to claim 4, which is characterized in that the material of the optical coating include antireflection material, Resist at least one of dirty material, anti scuffing material or transparent optical functional material.

6. according to claim 1 to optical film described in 3 any one, which is characterized in that filled with saturating in the light transmission hole Luminescent material is air.

7. according to claim 1 to optical film described in 3 any one, which is characterized in that the light transmission hole is regular array Geometry.

8. optical film according to claim 7, which is characterized in that the geometry is any in round or polygon It is a kind of.

9. a kind of fingerprint identification device, it is characterised in that: including the signal sensing module being superposed and light source emitting module, institute The side for stating the separate light source emitting module of signal sensing module is equipped with optical film described in claim 1 to 8 any one；

The light source emitting module is configured to, and emits primary light to the finger touched on optical film across signal sensing module Source；

The signal sensing module is configured to, and receives the original light source handling digital reflex and filtering through optical film.

10. a kind of lighting screen body, which is characterized in that be equipped with described in claim 1 to 8 any one on the lighting screen body Optical film, for improve different perspectives due to optics coupling or light by transparent medium when the colour cast problem that generates.