THIN TYPE FINGERPRINT RECOGNITION DEVICE WITH OPTICAL FILTER STRUCTURE
The present invention discloses thin type fingerprint recognition devices with optical filter structure, it includes a transparent layer, an optical film and an optical sensor, wherein the optical film is formed on a first surface in an embodiment, and is formed on a second surface in another embodiment. With the implementation of the present invention, complex production process or equipments are not required for producing fingerprint recognition devices and reduces costs of production; the size of the fingerprint recognition device is reduced, a variety of thickness choices for transparent layer and more applications are thus possible; and the directivity and the contrast of fingerprint signal is enhanced thus enables making clearer features and characteristics of the fingerprint signal and thus the recognition accuracy of fingerprints.
1 . A thin type fingerprint recognition device with optical filter structure, used to sense or recognize a fingerprint, comprising:
a transparent layer, being made of light transmitting substance, has a first surface and a second surface opposite to the first surface;
an optical film, being formed on the second surface; and
an optical sensor, being fixedly provided beside the optical film;
wherein the fingerprint to be sensed or recognized being in contact with the first surface.
2 . The thin type fingerprint recognition device of claim 1 , wherein a spacing gap being in between the optical film and the optical sensor.
3 . The thin type fingerprint recognition device of claim 1 , wherein the transparent layer is being penetrated by visible light, infrared light or ultraviolet light.
4 . The thin type fingerprint recognition device of claim 1 , wherein the thickness of the transparent layer being in the range from 1 μm to 300 μm, or in the range from 300 μm to 500 μm.
5 . The thin type fingerprint recognition device of claim 1 , wherein a pillar layer being further formed in between the optical film and the optical sensor, and wherein the pillar layer being a non-transparent filler material with plural cylindrical through holes.
6 . A thin type fingerprint recognition device with optical filter structure, used to sense or recognize a fingerprint, comprising:
a transparent layer, being made of light transmitting substance, has a first surface and a second surface opposite to the first surface;
an optical film, being formed on the first surface; and
an optical sensor, being fixedly provided beside the optical film;
wherein the fingerprint to be sensed or recognized being in contact with the optical film.
7 . The thin type fingerprint recognition device of claim 6 , wherein a spacing gap being in between the second surface and the optical sensor.
8 . The thin type fingerprint recognition device of claim 6 , wherein the transparent layer is being penetrated by visible light, infrared light or ultraviolet light.
9 . The thin type fingerprint recognition device of claim 6 , wherein the thickness of the transparent layer being in the range from 1 μm to 300 μm, or in the range from 300 μm to 500 μm.
10 . The thin type fingerprint recognition device of claim 6 , wherein a pillar layer being further formed in between the second surface and the optical sensor, wherein the pillar layer being a non-transparent filler material with plural cylindrical through holes.
11 . The thin type fingerprint recognition device of claim 1 , wherein a pillar layer being further formed in between the optical film and the optical sensor, and wherein the pillar layer being formed by plural silicon oxide (SiO2) rods, wherein any space between any two rods is filled with non-transparent filler material.
12 . The thin type fingerprint recognition device of claim 1 , wherein the optical film is formed such that the reflectivity of an inclined incident light with incident angle in between −50 degree to +50 degree is greater than 25%.
13 . The thin type fingerprint recognition device of claim 1 , wherein the optical film is formed such that the reflectivity of an inclined incident light with incident angle in between −50 degree to +50 degree is greater than 50%.
14 . The thin type fingerprint recognition device of claim 1 , wherein the maximum penetrating rate through the optical film of inclined incident light with incident angle between −10 degree to +10 degree is at least twice the minimum penetrating rate through the optical film of inclined incident light with incident angle between −80 degree to +80 degree.
15 . The thin type fingerprint recognition device of claim 1 , wherein the maximum penetrating rate through the optical film of inclined incident light with incident angle between −10 degree to +10 degree is at least twice the minimum penetrating rate through the optical film of inclined incident light with incident angle between −50 degree to +50 degree.
16 . The thin type fingerprint recognition device of claim 6 , wherein a pillar layer being further formed in between the second surface and the optical sensor, and wherein the pillar layer being formed by plural silicon oxide (SiO2) rods, wherein any space between any two rods is filled with non-transparent filler material.
17 . The thin type fingerprint recognition device of claim 6 , wherein the optical film is formed such that the reflectivity of an inclined incident light with incident angle in between −50 degree to +50 degree is greater than 25%.
18 . The thin type fingerprint recognition device of claim 6 , wherein the optical film is formed such that the reflectivity of an inclined incident light with incident angle in between −50 degree to +50 degree is greater than 50%.
19 . The thin type fingerprint recognition device of claim 6 , wherein the maximum penetrating rate through the optical film of inclined incident light with incident angle between −10 degree to +10 degree is at least twice the minimum penetrating rate through the optical film of inclined incident light with incident angle between −80 degree to +80 degree.
20 . The thin type fingerprint recognition device of claim 6 , wherein the maximum penetrating rate through the optical film of inclined incident light with incident angle between −10 degree to +10 degree is at least twice the minimum penetrating rate through the optical film of inclined incident light with incident angle between −50 degree to +50 degree.