Optical fingerprint identification device and preparation method thereof
A fingerprint recognition and optical technology, applied in character and pattern recognition, acquisition/organization of fingerprints/palmprints, instruments, etc., can solve the problem of high signal-to-noise ratio between fingerprint signal and light source signal, avoid light leakage interference, accuracy and use The effect of fewer conditions and improved identification ability
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Embodiment 1
[0043] In order to prevent some light from directly entering the transparent substrate, refracting it out, and then encountering the finger and reflecting it into the optical sensor 4, the present invention preferably sets a first light-shielding layer on the transparent substrate 1 around the finger touch area 11. 53 , the first light-shielding layer 53 is located right above the light source 2 . Some of the emitted direct light will directly enter the transparent substrate 1, and then be absorbed by the first light-shielding layer 53 covering it, so as to prevent the light that does not enter the finger touch area 11 from being directly refracted and affect the performance of the fingerprint recognition device. beautiful.
[0044] The material of the first light-shielding layer here has no special requirements, as long as it is opaque, the purpose of the invention can be achieved, and it can be a metal layer, such as Mo / Al / Mo, Ag, and the like.
[0045] Preferably, as fig...
Embodiment 2
[0050] Such as figure 1 As shown, in order to further reduce the noise of the fingerprint optical recognition device, an encapsulation layer 3 and a second light-shielding layer 51 are also provided between the finger touch area 11 and the optical sensor 4. A light hole 6 is arranged directly above the optical sensor 4 .
[0051] The opaque light source seat 52 in this embodiment is disposed on the transparent encapsulation layer 3 , and the second light-shielding layer 51 is disposed on the outer surface of the encapsulation layer 3 .
[0052] The present invention has no special requirements on the material of the second light-shielding layer 51 , as long as it is opaque, the purpose of the invention can be achieved, and it can be a metal layer, such as Mo / Al / Mo, Ag, etc.
[0053] The diameter of the clear hole is 10um-500um, preferably 15um in the present invention, and the distance between adjacent clear holes is 10um-10mm, preferably 0.68mm in the present invention, such...
Embodiment 3
[0058] The difference from Example 2 is that, as Figure 4 As shown, the opaque light source seat 52 is disposed on the second light-shielding layer 51 , and the second light-shielding layer 51 is disposed on the inner side of the encapsulation layer 3 .
[0059] When a finger is pressed on the finger touch area 11, the light reflected by the transparent substrate 1 is filtered by the second light-shielding layer 51 before reaching the optical sensor 4, and the light after passing through the light hole 6 passes through the encapsulation layer After 3, it is finally captured by the optical sensor 4, and part of the light that does not enter the light hole 6 will be blocked or absorbed by the second light-shielding layer 51. Using the principle of small hole imaging, high-definition fingerprint graphics can be obtained. It is beneficial to improve the recognition accuracy of the optical sensor to the fingerprint image.
[0060] Such as Figure 4 As shown, the method for speci...
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