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Optical fingerprint identification device

A fingerprint identification and optical technology, applied in the field of fingerprint identification, can solve problems that affect the reliability of fingerprint identification, light refraction and scattering, and affect the clarity of fingerprint imaging, etc., to achieve the effect of improving clarity, improving signal-to-noise, and improving reliability

Active Publication Date: 2019-05-14
WUHAN CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides an optical fingerprint identification device to solve the existing optical fingerprint identification module. Since the light used for fingerprint identification needs to pass through different media during the transmission process, the reflected light will be refracted and scattered, and then Issues that affect the clarity of fingerprint imaging on the optical fingerprint chip, which in turn affects the reliability of fingerprint recognition

Method used

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Examples

Experimental program
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Embodiment 1

[0025] Such as figure 1 As shown, the present invention provides an optical fingerprint identification device 10, which includes a substrate 11, a photosensitive element 12, a collimating layer 13, a cover plate 14, and a backlight module 15.

[0026] Wherein, the photosensitive element 12 is disposed on the substrate 11, the cover plate 14 is disposed on the photosensitive element 12, and the cover plate 14 is located on the top layer of the fingerprint identification device 10 to encapsulate and protect The function of the device, the cover plate 14 is transparent glass, and the cover plate 14 is in contact with the fingerprint 20 of the human body.

[0027] The backlight module 15 is disposed on a side of the substrate 11 facing away from the photosensitive element 12, and the backlight module 15 provides a light source for optical fingerprint recognition.

[0028] The collimation layer 13 is formed by dispersing liquid crystals in solid organic polymers. The material of the colli...

Embodiment 2

[0039] Such as figure 2 As shown, the difference from the first embodiment is that the two opposite surfaces of the collimation layer 13 are respectively provided with a first electrode layer 17 and a second electrode layer 18, and the first electrode layer 17 is provided on the collimation layer. 13 is a side surface (upper surface) away from the substrate 11, and the second electrode layer 18 is disposed on a side surface (lower surface) of the collimating layer 13 close to the substrate 11. The electrode patterns of the first electrode layer 17 and the second electrode layer 18 are the same and arranged correspondingly. The materials of the first electrode layer 17 and the second electrode layer 18 are both ITO (Indium tin oxide, indium oxide). tin).

[0040] Such as image 3 As shown, the electrode pattern of the first electrode layer 17 is an array of small electrode blocks, the length and width of the electrode blocks can be 2-100 microns, the row spacing and column spacin...

Embodiment 3

[0043] Such as Figure 4 As shown, this embodiment provides an optical fingerprint identification device 30, which includes a substrate 31, a photosensitive element 32, a collimation layer 33, an OLED display layer 35, an adhesive layer 36, and a cover 34.

[0044] Wherein, the photosensitive element 33 is disposed on the substrate 31, the collimation layer 33 is disposed on the photosensitive element 32, the cover plate 34 is disposed on the collimation layer 33, and the OLED display The layer 35 is disposed between the collimating layer 33 and the cover plate 34.

[0045] The adhesive layer 36 is disposed on the cover plate 34 and the OLED display layer 35 for bonding the cover plate 34 and the OLED display layer 35.

[0046] The substrate 31 may be a flexible substrate, and the cover plate 34 is transparent glass for packaging and protecting the device and contacting the fingerprint 20 of the human body.

[0047] The collimation layer 35 is a PDLC film, the refractive index of the...

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Abstract

An optical fingerprint identification device comprises a substrate, a photosensitive element, a cover plate and a collimation layer arranged between the cover plate and the substrate, and the collimation layer is formed by dispersing liquid crystals in a solid organic polymer. By arranging the collimating layer prepared from the polymer dispersed liquid crystal, the signal noise can be improved, and the definition of the fingerprint on the photosensitive element is improved. Besides, compared with an existing lens and the like, the whole collimation layer has the advantages of being free of collision and relative displacement and the like, and the reliability of fingerprint recognition can be improved.

Description

Technical field [0001] The present invention relates to the technical field of fingerprint identification, in particular to an optical fingerprint identification device. Background technique [0002] With the continuous development of technology, the screen-to-body ratio of mobile terminals such as mobile phones has become higher and higher, and full-screen mobile terminals have become a development trend. For fingerprint recognition of full-screen mobile terminals, conventional capacitive fingerprints cannot penetrate the cover glass with a thickness of more than 0.5 mm, so they no longer adapt to the development trend of full-screen mobile terminals, but optical fingerprints with good penetration Become a new technical direction. [0003] At present, for the design of optical fingerprint recognition for a full screen, the optical fingerprint recognition module is generally placed below the display area. The light used for fingerprint identification needs to pass through the gla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G02F1/1334
CPCG02F1/1334
Inventor 刘凡成何剑
Owner WUHAN CHINA STAR OPTOELECTRONICS TECH CO LTD
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