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Backlight module for fingerprint identification in LCD screen and electronic equipment

A technology of backlight module and fingerprint identification, which is applied in the field of communication, can solve the problems that fingerprint identification or accurate identification cannot be realized, and achieve the effect of accurate identification and verification

Inactive Publication Date: 2019-11-05
SHENZHEN LONGLI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the fingerprint recognition unit 110 is placed under the backlight module, the infrared light carrying biometric fingerprint information cannot penetrate the backlight module and reach the fingerprint recognition unit 110, and fingerprint recognition or accurate recognition cannot be realized.

Method used

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  • Backlight module for fingerprint identification in LCD screen and electronic equipment
  • Backlight module for fingerprint identification in LCD screen and electronic equipment
  • Backlight module for fingerprint identification in LCD screen and electronic equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] First, through figure 2 , image 3 , the backlight module of Embodiment 1 of the present invention will be described. According to the backlight module of Embodiment 1 of the present invention, such as figure 2 As shown, the backlight module includes an optical film set 101 , an infrared transparent shading layer 102 , a light source 103 and a fingerprint recognition sensor 104 . The optical film set 101 includes a light guide plate 230 arranged on one side of the light source, a diffuser film 220 arranged above the light guide plate 230, a prism sheet 210 arranged above the diffuser film 220, and a reflective sheet 240 . The fingerprint recognition sensor 104 is disposed under the optical film set 101 . The vertical projection of the optical film set 101 on the infrared transparent light-shielding layer 102 has a non-overlapping area with the infrared transparent light-shielding layer 102 , so that infrared light can pass through the infrared transparent light-sh...

Embodiment 2

[0043] Please refer to Figure 4 , Figure 5 , is an exploded view of the backlight module according to Embodiment 1 of the present invention. Only the differences between Embodiment 2 and Embodiment 1 will be described below, and the similarities will not be repeated here.

[0044] The reflection sheet 240, the light guide plate 230, the diffusion film 220, and the prism sheet 210 on the backlight module are not provided with hollow areas. A notch is provided on the light guide plate 230, and the infrared transparent light-shielding layer 102 is disposed on the notch. Infrared light passes through the infrared transparent light-shielding layer 102 on the gap of the light guide plate 230, while the reflective sheet, the diffusion film and the prism sheet are also provided with gaps, and coincide with the gaps on the light guide plate 230 to form an infrared light signal path, The infrared optical signal is accurately and effectively collected by the fingerprint recognition ...

Embodiment 3

[0048] Please refer to Image 6 , is an exploded view of the backlight module according to Embodiment 1 of the present invention. In the following, only the differences between Embodiment 3 and Embodiment 1 will be described, and the similarities will not be repeated here.

[0049] The reflection sheet 240, the light guide plate 230, the diffusion film 220, and the prism sheet 210 on the backlight module are not provided with hollow areas. The light guide plate 230 is provided with a transparent area 231 , which is transparent to infrared light and has a uniform structure, without a V-shaped sawtooth light guide unit or other light guide structures, and has no light guide function. The transparent area 231 is a single-layer polymer material, and can also be replaced with a multi-layer polymer material. The infrared transparent light-shielding layer 102 is disposed on the transparent region 231 . Infrared light passes through the infrared transparent light-shielding layer 10...

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Abstract

The invention discloses a backlight module for fingerprint identification in an LCD screen and electronic equipment. The backlight module comprises an optical film set, an infrared transparent shadinglayer, a light source and a fingerprint recognition sensor. The optical film set comprises a light guide plate arranged on one side of the light source, a diffusion film arranged above the light guide plate, a prismatic lens arranged above the diffusion film, and a reflector plate arranged below the light guide plate. The fingerprint identification sensor is arranged below the optical film group.The infrared transparent shading layer is connected with the optical film group or the light source. The vertical projection of the optical film group on the infrared transparent shading layer and the infrared transparent shading layer have a non-overlapping area, so that infrared light penetrates through the infrared transparent shading layer.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a backlight module and electronic equipment used for fingerprint recognition in an LCD screen. Background technique [0002] Fingerprint sensing and matching is a reliable and widely used technology. A common method of fingerprint identification involves scanning a sample fingerprint or an image thereof and storing the image and / or unique characteristics of the fingerprint image, the characteristics of the sample fingerprint can be compared with information from reference fingerprints already present in a database to determine the correct identification of the user , for example for verification purposes. In particular, in-display fingerprint recognition based on optical sensors is becoming more and more popular due to its ease of operation and versatility, and its suitability for compact portable electronic devices. [0003] The fingerprint recognition display device in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/20
CPCG06V10/147
Inventor 张小齐曾晓虎彭益刘政
Owner SHENZHEN LONGLI TECH CO LTD
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