Summary of the invention
The problem that the present invention solves is to provide a kind of cover sheet, optical fingerprint sensor module and electronic product, increases adherence force enough between cover sheet and corresponding construction.
For solving the problem, the invention provides a kind of cover sheet, comprising:
For the protection of the plate body of optical fingerprint sensor, described plate body has inside surface and outside surface, and the area of described plate body inside surface is more than or equal to the photosensitive area of corresponding optical fingerprint sensor, and one of them surface of described inside surface and outside surface is uneven surface.
Optionally, the roughness range of described uneven surface is 1.6 μm ~ 6.3 μm.
Optionally, the outside surface of described plate body is curved surface, and described curved surface makes described plate body be concave inward structure or outer male structure.
Optionally, described plate body is glass plate, sapphire plate, organic resin plate or fibre optic plate.
Optionally, described uneven surface is sub-light frosting.
Optionally, described uneven surface is coated with redness, orange, black, pink colour, white, green, blueness, purple and yellow at least one.
For solving the problem, present invention also offers a kind of optical fingerprint sensor module, comprising:
Cover sheet as above;
Optical fingerprint sensor, the upper surface of described optical fingerprint sensor is relative with the inside surface of described cover sheet.
Optionally, connect by gluing between the upper surface of described optical fingerprint sensor and the inside surface of described cover sheet.
Optionally, described optical fingerprint sensor has transmission region, and the backlight sent below described optical fingerprint sensor can arrive described cover sheet through described optical fingerprint sensor.
A kind of electronic product, comprises optical fingerprint sensor module as above.
Optionally; described electronic product is mobile phone, and described mobile phone has front shroud, and described front shroud has basal surface; connect by gluing between the basal surface of described front shroud and described optical fingerprint sensor module, the outside surface of bonding with the basal surface of described front shroud is described cover sheet.
Optionally, the surface that described front shroud is bonding with described optical fingerprint sensor module is rough surface.
Compared with prior art, technical scheme of the present invention has the following advantages:
In technical scheme of the present invention; the cover sheet provided comprises the plate body for the protection of optical fingerprint sensor; described plate body has inside surface and outside surface; the area of described plate body inside surface is more than or equal to the photosensitive area of corresponding optical fingerprint sensor, and one of them surface of described inside surface and outside surface is uneven surface.Due to the existence of uneven surface; corresponding glue can infiltrate in the tiny gully of uneven surface; cover sheet and the saturating ability of the corresponding construction light mutually bonding with cover sheet are increased, thus the quality of fingerprint image can be improved, adherence force enough between cover sheet and corresponding construction can be increased again.
Further, when the outside surface of cover sheet is uneven surface, uneven surface can increase the rubbing action of outside surface, when finger directly contacts outside surface, friction force during finger touch can be made to increase, soft handle.
Embodiment
There is bonding bonding fastness problem loosely in existing cover sheet and corresponding optical fingerprint sensor.Further, the appearance property of existing cover sheet and feel not good.
For this reason; the invention provides a kind of new cover sheet; comprise: for the protection of the plate body of optical fingerprint sensor; described plate body has inside surface and outside surface; the area of described plate body inside surface is more than or equal to the photosensitive area of corresponding optical fingerprint sensor, and one of them surface of described inside surface and outside surface is uneven surface.Due to the existence of uneven surface; corresponding glue can infiltrate in the tiny gully of uneven surface; cover sheet and the saturating ability of the corresponding construction light mutually bonding with cover sheet are increased, thus the quality of fingerprint image can be improved, adherence force enough between cover sheet and corresponding construction can be improved again.
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail specific embodiments of the invention below in conjunction with accompanying drawing.
Please refer to Fig. 1, the embodiment of the present invention provides a kind of cover sheet 100.Cover sheet 100 comprises the plate body (entirety of plate body and cover sheet 100 does not mark separately) for the protection of optical fingerprint sensor, and described plate body has inside surface (mark) and outside surface 100a.In the present embodiment, the area of described plate body inside surface is more than or equal to the photosensitive area of optical fingerprint sensor corresponding to it (described optical fingerprint sensor is used for forming corresponding optical fingerprint sensor module to cover sheet 100).Wherein, described inside surface and outside surface 100a are uneven surface.
In the present embodiment, the roughness range of described uneven surface (outside surface 100a) controls to be 1.6 μm ~ 6.3 μm by inventor.When cover sheet 100 is uneven surface, because light diffuse reflection can occur at this uneven surface, thus make cover sheet 100 in semi-transparent state, corresponding fingerprint imaging is fuzzy.The roughness of uneven surface is larger, and fingerprint imaging is fuzzyyer, in order to ensure the quality of fingerprint imaging, needs roughness to control below 6.3 μm.Now, if carry out a glue at described uneven surface, glue can fill the gully of tiny injustice on described uneven surface, thus adds cover sheet 100 and answer the good stickup performance between optical fingerprint sensor.Further, in the present embodiment, the refractive index selection of glue and the refractive index close of corresponding cover sheet 100, can increase the transmittancy of cover sheet 100 like this.Meanwhile, roughness controls usually more than 1.6 μm, after ensureing that the gully of tiny injustice coordinates with corresponding glue, can increase enough cementabilities, makes cover sheet 100 obtain corresponding raising to the bonding effect between optical fingerprint sensor.Therefore, the uneven surface of cover sheet 100 can be controlled, between roughness 1.6 μm to 6.3 μm, so both to ensure that the quality of fingerprint image, can improve enough adherence forces again.In addition, because described inside surface and outside surface 100a are uneven surface, uneven surface can increase the rubbing action of outside surface, thus friction force when making finger touch increases, soft handle.
In the present embodiment, cover sheet 100 can be light-transmitting materials, also can be that trnaslucent materials makes.Concrete, cover sheet 100 can be glass plate, sapphire plate, organic resin plate or fibre optic plate (waiting transparent material).Described organic resin plate is specifically as follows plastic sheeting (plate).When cover sheet 100 adopts glass material to make; because described inside surface and outside surface 100a are made as uneven surface by the present embodiment; therefore, the surfaces externally and internally of cover sheet 100 does not need to carry out polishing, thus solves transparent glass carries out glossing step in order to properties of transparency.That is, in the present embodiment, can glossing be omitted for the surface being made into uneven surface, thus save processing step, reduce process costs.
Aforementioned known, described inside surface and the outside surface 100a of cover sheet 100 are uneven surface, and uneven surface has the effect in non-(throwing) light face.The present embodiment can process further; the described inside surface of cover sheet 100 and outside surface 100a is made to be frosting (soft diffuse reflection occurs on frosting surface); and again after a step aftertreatment, make the described inside surface of cover sheet 100 and outside surface 100a be sub-light frosting.Sub-light frosting outward appearance is soft comfortable, and visual effect is better than the light face (smooth surface) of polishing.In summary, in the present embodiment, described uneven surface can be treated to sub-light frosting, by carrying out sub-light process and plating color treatments, can also improve appearance property and the feel of cover sheet.
In the present embodiment, described uneven surface (described uneven surface can be the state being treated to frosting or sub-light frosting) can be coated with redness, orange, white, green, blue, purple and yellow at least one (color).By carrying out aftertreatment to cover sheet 100, such as plating waits aftertreatment, makes described uneven surface have shades of colour.
In the cover sheet 100 that the present embodiment provides, because described inside surface and outside surface 100a are uneven surface, therefore both ensure that the quality of fingerprint image, and enough adherence forces can have been improved again.In addition, because outside surface 100a is uneven surface, uneven surface can increase the rubbing action of outside surface, when finger directly contacts outside surface 100a, friction force during finger touch can be made to increase, soft handle.
Please refer to Fig. 2, another embodiment of the present invention provides another kind of cover sheet, i.e. cover sheet 200.Cover sheet 200 comprises the plate body (entirety of plate body and described cover sheet 200 does not mark separately) for the protection of optical fingerprint sensor equally.In the present embodiment, described plate body has inside surface (mark) and outside surface (mark), and the area of described plate body inside surface is more than or equal to the photosensitive area of corresponding optical fingerprint sensor.In the present embodiment, described inside surface is uneven surface.
In the present embodiment, the outside surface of described plate body is curved surface, and described curved surface makes described plate body be concave inward structure.Because described curved surface makes described plate body be concave inward structure, therefore, if finger directly carries out fingerprint recognition by being pressed on cover sheet 200, then three-dimensional information in fingerprint can be obtained by corresponding recognizer.
In the present embodiment, described plate body can be glass plate, sapphire plate, organic resin plate or fibre optic plate, the roughness range of described uneven surface is 1.6 μm ~ 6.3 μm, described uneven surface can be further processed as sub-light frosting, and described uneven surface can be coated with at least one of redness, orange, white, green, blue, purple and yellow.Its reason and particular content can with reference to previous embodiment corresponding contents.
Please refer to Fig. 3, another embodiment of the present invention provides another kind of cover sheet, i.e. cover sheet 300.Cover sheet 300 comprises the plate body (entirety of plate body and described cover sheet 300 does not mark separately) for the protection of optical fingerprint sensor equally.In the present embodiment, described plate body has inside surface (mark) and outside surface (mark), and the area of described plate body inside surface is more than or equal to the photosensitive area of corresponding optical fingerprint sensor.In the present embodiment, described inside surface and outside surface are uneven surface simultaneously.Because described inside surface and outside surface are uneven surface simultaneously; therefore; in the cover sheet that the present embodiment provides; the uneven surface of outside surface may be used for touch feeling when improving fingerprint recognition, and the uneven surface of inside surface may be used for improving the bonding effect between optical fingerprint sensor and cover sheet.That is, in the cover sheet that the present embodiment provides, because inside surface is uneven surface, uneven surface coordinates the use of glue, can solve viscose glue problem loosely between cover sheet and optical fingerprint sensor.
In the present embodiment, the outside surface of described plate body is curved surface, and described curved surface makes described plate body be outer male structure.Because described curved surface makes described plate body be outer male structure, therefore, if finger directly by be pressed in cover sheet 300 carries out fingerprint recognition time, then can obtain three-dimensional information in fingerprint by corresponding recognizer.
In the present embodiment, described plate body can be glass plate, sapphire plate, organic resin plate or fibre optic plate, the roughness range of described uneven surface is 1.6 μm ~ 6.3 μm, described uneven surface can be further processed as sub-light frosting, described uneven surface can be coated with redness, orange, white, green, blue, purple and yellow at least one.Its reason and particular content can with reference to previous embodiment corresponding contents.
It should be noted that, in other embodiments, cover sheet can have other shape; the such as flat rectangular bodily form, or plan view shape is the shape of track type or chamfering rectangle, simultaneously; cover sheet still has two maximum surfaces of area, i.e. inside surface and outside surface.Such as, and in inside surface and outside surface, one of them surface can be had to be uneven surface, and being only inside surface is uneven surface, or only outside surface is uneven surface, or inside surface and outside surface are uneven surface simultaneously.
The embodiment of the present invention additionally provides a kind of optical fingerprint sensor module, as shown in Figure 4 and Figure 5, wherein, Fig. 4 is the schematic top plan view of described optical fingerprint sensor module, Fig. 5 is the diagrammatic cross-section of described optical fingerprint sensor module, i.e. the cross-section structure that obtains along the cutting of A-A dot-and-dash line for structure shown in Fig. 4 of Fig. 5.
Incorporated by reference to reference to figure 4 and Fig. 5; described optical fingerprint sensor module comprises cover sheet 401; the structures and characteristics of cover sheet 401 can with reference to the corresponding contents of the aforementioned cover sheet of this instructions (comprising cover sheet 100, cover sheet 200 and cover sheet 300); concrete, the present embodiment makes the outside surface of cover sheet 401 and inside surface be uneven surface.
Described optical fingerprint sensor module also comprises optical fingerprint sensor 403, and the upper surface of described optical fingerprint sensor 403 is relative with the inside surface of described cover sheet 401.Described optical fingerprint sensor module also comprises the parts such as light guide plate 405, light source 404, chip (IC) 402, flexible printed circuit board (FPC) 406.Wherein, light source 404 can be LED.
Though do not show in figure, but described optical fingerprint sensor module can also comprise the structure such as containment vessel and lower containment vessel; certainly; can not go up containment vessel structure, and make outside cover sheet 401 is directly exposed to, for finger presses to carry out fingerprint recognition yet.
In the present embodiment, the principle of work of described optical fingerprint sensor module is: the light that light source 404 sends, after light guide plate 405, is converted to uniform incident light (being equivalent to area source).Incident light (not shown), through after optical fingerprint sensor 403 and cover sheet 401, arrives finger (not shown), after the reflection of the fingerprint face of finger, turns back and becomes reflected light (not shown).Reflected light, after cover sheet 401, turns back to optical fingerprint sensor 403 surface, and is received by the photo-sensitive cell of optical fingerprint sensor 403 (photo-sensitive cell is generally pixel cell, not shown).Because finger print face is uneven, also different through its intensity of reflected light reflected.Described photo-sensitive cell is converted into electric signal (opto-electronic conversion) after receiving the light signal of reflected light, and optical fingerprint sensor is by electric signal transmission in chip 402 afterwards, forms finger print information by chip 402 according to the electric signal obtained.Described finger print information outputs to the such as disposal system such as mobile phone or computer by flexible printed circuit board 406.
In the present embodiment, optical fingerprint sensor 403 has transmission region, and the backlight sent below optical fingerprint sensor 403 can arrive described cover sheet 401 through described optical fingerprint sensor 403.Concrete, the substrate of optical fingerprint sensor 403 can be glass substrate, to ensure that optical fingerprint sensor 403 can printing opacity.It should be noted that, in other embodiment, the substrate of optical fingerprint sensor also can be other transparency carrier, or translucent substrate, such as pmma substrate etc.
Please refer to Fig. 6, show the structure for amplifying of dotted line frame 41 encirclement part in Fig. 5, this structure is the structure of cover sheet 401 and optical fingerprint sensor 403 abutting edge.As seen from Figure 6, bonded together by glue 407 between cover sheet 401 and optical fingerprint sensor 403.Please continue to refer to Fig. 7, show the structure for amplifying of dotted line frame 42 encirclement part in Fig. 6, i.e. the structure for amplifying of glue 407 and cover sheet 401 abutting edge.As seen from Figure 7; due in the present embodiment; the inside surface of cover sheet 401 is uneven surface; therefore; glue 407 can enter into the gully of the tiny injustice of cover sheet 401 inside surface; and after these glue 407 enter into the gully of tiny injustice, glue 407 and the adhesive ability of cover sheet 401 can be made to strengthen, thus prevent glue 407 from coming off from cover sheet 401 inside surface.Like this, just enhance the bonding strength between cover sheet 401 and optical fingerprint sensor, solve viscose glue problem loosely between existing cover sheet 401 and optical fingerprint sensor.
Meanwhile, noted earlier as this instructions, because cover sheet 401 inside surface is uneven surface, therefore, when the material of cover sheet 401 is glass, do not need the step of cover sheet 401 being carried out to glossing.Existing transparent glass can carry out polishing in order to properties of transparency, and the present embodiment can reduce these processing steps, thus saves the process time, reduces process costs.
In the present embodiment, connect by gluing between the upper surface of optical fingerprint sensor 403 and the inside surface of cover sheet 401.Mention above, when the inside surface of cover sheet 401 is rough surface, the bonding firmness between optical fingerprint sensor with cover sheet 401 can be improved.In addition, in the present embodiment, the outside surface of cover sheet 401 is also uneven surface, thus can increase the touch friction force of finger, soft handle.
Another embodiment of the present invention additionally provides a kind of electronic product, and described electronic product is mobile phone, i.e. mobile phone 500 as shown in Figure 8.Mobile phone 500 shown in Fig. 8 comprises mobile phone front shroud 501 and mobile phone screen 502.Mobile phone 500 also comprises optical fingerprint sensor module 510, the optical fingerprint sensor module that optical fingerprint sensor module 510 can provide for this instructions is aforementioned, can in conjunction with reference to figure 4 to Fig. 7.
Please refer to Fig. 9, the cross-section structure that Fig. 9 obtains along the cutting of B-B dot-and-dash line for structure shown in Fig. 8.Can see, in the front shroud 501 of mobile phone 500, groove 5011 can being had in the position corresponding to optical fingerprint sensor module 510 from cross-section structure.And optical fingerprint sensor module 510 comprises cover sheet 511, optical fingerprint sensor 512, light guide plate 513 and flexible printed circuit board 514, the structures and characteristics of more optical fingerprint sensor modules 510 can with reference to previous embodiment corresponding contents.
In the present embodiment, outside surface and the inside surface of cover sheet 511 are uneven surface.In Fig. 9, the outside surface of cover sheet 511 is the surface relative with front shroud 501 bottom surface, and the inside surface of cover sheet 511 is the surface of pasting with optical fingerprint sensor 512.
Please refer to Figure 10, Figure 10 is the structure for amplifying schematic diagram of dotted line frame 51 encirclement part in structural representation shown in Fig. 9.In the present embodiment, when cover sheet 511 is pasted onto front shroud 501, the basal surface of front shroud 501 is bonding by glue 503 with between described optical fingerprint sensor module, the outside surface of bonding with the basal surface of front shroud 501 is cover sheet 511.
In the present embodiment, arranging front shroud 501 surface bonding with described optical fingerprint sensor module (i.e. the basal surface of front shroud 501) is rough surface.The basal surface of front shroud 501 is set to uneven surface; both adherence force can be increased; glue 503 can be utilized again to infiltrate the tiny gully of rough surface and increase the saturating ability of light of corresponding construction, the more important thing is the stickup acting force increased between cover sheet 511 and front shroud 501.The roughness of described rough surface can be set to 1.6 μm ~ 6.3 μm equally, and its principle can with reference to this instructions foregoing teachings.
It should be noted that, in other embodiment, described electronic product can be the terminal devices such as panel computer, notebook computer or e-book.
Although the present invention discloses as above, the present invention is not defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.