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Backlight module and electronic device

A technology of backlight module and light source, applied in the field of communication, can solve the problems of increasing LCD mobile terminals, low fingerprint identification accuracy, uneven display image, etc., and achieve the effect of maintaining display effect and realizing accurate identification and verification.

Inactive Publication Date: 2019-10-08
SHENZHEN LONGLI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the optical fiber collimation layer and other optical functional layers increase the thickness of the LCD mobile terminal, and there is no distinction between the biological fingerprint optical signal and the display optical signal, resulting in uneven display images and low fingerprint recognition accuracy.

Method used

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  • Backlight module and electronic device
  • Backlight module and electronic device
  • Backlight module and electronic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 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, the backlight module includes a light source 221 and a light guide plate 220 disposed on one side of the light source 221, a reflective sheet 210 disposed below the light guide plate 220, and an infrared transparent film disposed above the light guide plate 220. Diffusion film 230, and the fingerprint identification device 103 that is arranged under the infrared transparent diffusion film 230 and the reflection sheet 210, to identify the biological fingerprint optical signal; wherein, the infrared transparent diffusion film 230 contains evenly distributed CdO nanoparticles, and its particle diameter is about 20nm, such as image 3 As shown in the cross-sectional structure diagram of the infrared transparent diffusion film, CdO nanoparticles emit light in the form of non-direct...

Embodiment 2

[0031] Please refer to Figure 4 , is a cross-sectional structure view of the backlight module based on the infrared transparent diffusion film according to the second embodiment of the present invention. The differences between Embodiment 2 and Embodiment 1 will be described below, and the similarities will not be repeated here. The fingerprint identification device is disposed between the light guide plate 220 and the reflector 210 .

Embodiment 3

[0033] Please refer to Figure 5, is a cross-sectional structure view of the backlight module based on the infrared transparent diffusion film according to the third embodiment of the present invention. Only the differences between Embodiment 3 and Embodiment 1 will be described below, and the similarities will not be repeated here. The fingerprint identification device is disposed between the light guide plate 220 and the infrared transparent diffusion film 230 .

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Abstract

The invention discloses a backlight module for fingerprint recognition in an LCD screen. The backlight module comprises a light source, a light guide plate disposed at one side of the light source, areflection sheet disposed below the light guide plate, an infrared transparent diffusion film disposed above the light guide plate, and a fingerprint recognition device disposed below the infrared transparent diffusion film. The fingerprint recognition device is used for identifying a biological fingerprint optical signal. The infrared transparent diffusion film contains visible light diffusion particles, so that visible light is diffused on the infrared transparent diffusion film; and the infrared light is transmitted through the infrared transparent diffusion film without scattering. With the backlight module, the fingerprint identification signal can be transmitted through the LCD module effectively and can be collected accurately, thereby realizing the in-screen fingerprint recognitionfunction of the LCD display device.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a backlight module and electronic equipment used for fingerprint identification 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 is currently becoming more and more popular due to its ease of operation and versatility, and its suitability for compact portable electronic devices. The fingerprint recognition display device in the LCD screen obvio...

Claims

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Application Information

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IPC IPC(8): G02F1/13357G02B5/20G06K9/00
CPCG02F1/133615G02F1/133606G02B5/208G06V40/1324
Inventor 张小齐杨运清蔡锋毅
Owner SHENZHEN LONGLI TECH CO LTD
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