Optical fingerprint identification system

Abstract

The invention discloses an optical fingerprint identification system, wherein the surface of a light guiding panel is used as a fingerprint sensing area for finger pressing; a collimating optical signal is supplied; the optical signal is introduced into the light guiding panel for transmission through an inner total reflection effect; total reflection of the optical signal in the light guiding panel is damaged by finger pressing; an optical sensing element can detect waveform change of the optical signal and performs processing for obtaining a fingerprint image. Therefore, when the optical fingerprint identification system is integrated in a display panel, the optical sensing element can be concealed at the back surface of the display panel; the optical sensing element does not require receiving the reflected light of the fingerprint, thereby preventing a penetration problem. Furthermore the fingerprint sensing area can be applied to the total or local area of the light guiding panel.Not only is more elastic use realized, but also aesthetic feeling requirement of a consumer to appearance of a product is satisfied.

Description

technical field [0001] The invention relates to a fingerprint identification technology, in particular to an optical fingerprint identification system which utilizes the internal total reflection effect of light for sensing and identification. Background technique [0002] Fingerprint identification is a kind of biometric identification technology, which uses the unique fingerprint information on human fingers for identification, and is widely used for its advantages in safety and convenience; for example, almost all smart phones today The fingerprint recognition function has been added, which can provide fingerprint encryption and fingerprint unlocking. [0003] An optical fingerprint identification system 10, please refer to figure 1 , a pressing plate 12 , a light diffusion plate 13 and a photosensitive element 11 are arranged in sequence from top to bottom, and a plurality of light sources 14 are arranged around the photosensitive element 11 . Wherein, the pressing pla...

AI Technical Summary

Problems solved by technology

In the method of integrating or combining the fingerprint identification system into the display panel, if the related components of fingerprint identification are placed above the display panel, since the silicon wafer-based photosensitive element is opaque, it will be exposed outside the display panel , and there is a problem of penetration under the display panel, it may not be able to receive the reflected light of the fingerprint well, thus affecting the accuracy of fingerprint recognition

Therefore, there are certain limitations in combining the fingerprint recognition system with the display panel, and it is difficult not to interfere with the appearance design of the product.

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