Filtering assembly and forming method thereof

A component and light-shielding layer technology, which is applied in the field of fingerprint recognition, can solve the problems that the filter components need to be improved, and achieve the effect of improving the quality of optical signals and reducing crosstalk optical signals

Pending Publication Date: 2021-10-26
SHANGHAI OXI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the existing filter components still need to be improved

Method used

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  • Filtering assembly and forming method thereof
  • Filtering assembly and forming method thereof
  • Filtering assembly and forming method thereof

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Experimental program
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Embodiment Construction

[0042] The analysis is now combined with an optical filter assembly, the optical filter assembly includes: a light-shielding layer with a plurality of first through holes in the light-shielding layer; a light-absorbing layer, the light-absorbing layer is located on the light-shielding layer, the There are a plurality of second through holes in the light absorbing layer, and the second through holes correspond to the first through holes one by one. The light-shielding layer can filter out part of the light output by the second through hole with a large inclination angle, but part of the light output by the third through hole of the light absorbing layer can be filtered due to the large inclination angle of the light direction. Passing through the adjacent or farther second through holes, so that the light emitted by the second through holes includes crosstalk light signals, resulting in poor quality of the light signals emitted by the second through holes and affecting the image...

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Abstract

The invention discloses a filtering assembly and a forming method thereof, and the filtering assembly comprises a first light shielding layer which is internally provided with a plurality of first through holes; a second light shielding layer, located on the first light shielding layer, a plurality of second through holes being formed in the second light shielding layer, and the second through holes being in one-to-one correspondence with the first through holes; a light absorption layer, located on the second light shielding layer, a plurality of third through holes being formed in the light absorption layer, and the third through holes corresponding to the second through holes one to one. The optical filtering assembly can reduce the risk of occurrence of optical crosstalk.

Description

technical field [0001] The invention relates to the technical field of fingerprint identification, in particular to a filter assembly and a forming method thereof. Background technique [0002] The optical fingerprint recognition device can realize automatic collection of fingerprints, and is widely used in attendance machines, access control, mobile phones or tablet computers and other equipment. [0003] The optical fingerprint identification device mainly uses the principle of refraction and reflection of light. The angle of refraction of the light emitted by the light source on the uneven lines of the fingerprint on the surface of the finger and the brightness of the reflected light are different. The CMOS (Complementary Metal Oxide Semiconductor) optical sensor will respond accordingly. The image information of different light and dark degrees is collected to complete the collection of fingerprints. [0004] The optical fingerprint identification device has strong envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L27/146G06K9/00
CPCH01L27/14621H01L27/14625H01L27/14627H01L27/14643H01L27/14685H01L27/14689
Inventor 韩勇朱虹凌严
Owner SHANGHAI OXI TECH
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