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Light guide plate with infrared ray transmitting and visible light reflecting functions and backlight module

A technology of infrared rays and light guide plates, which is applied in the field of LCD backlight, can solve the problems that the backlight module cannot pass through infrared rays, etc., and achieve the effects of strong anti-internal stress performance, improved screen brightness, and improved light utilization.

Pending Publication Date: 2022-06-24
NINGBO EXCITON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem that the existing backlight module cannot transmit infrared rays, the present invention provides a light guide plate and a backlight module with the function of transmitting infrared rays and reflecting visible light
Compared with the traditional backlight module, the light guide plate with the function of transmitting infrared rays and reflecting visible light provided by the present invention can transmit infrared rays and reflect visible light, which solves the problem that the existing backlight module reflects infrared rays while reflecting visible light

Method used

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  • Light guide plate with infrared ray transmitting and visible light reflecting functions and backlight module
  • Light guide plate with infrared ray transmitting and visible light reflecting functions and backlight module

Examples

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Effect test

Embodiment 1

[0046] Provided is a light guide plate with a function of transmitting infrared rays and reflecting visible light. The substrate is made of polycarbonate (PC) and has a thickness of 0.36 mm. The preparation method includes the following steps:

[0047] (1) Nitrogen purges the surface of the substrate for 3 minutes to remove impurities of larger particles;

[0048](2) The vacuum degree of the coating chamber is 0.1 mbar, the flow rate of argon gas is 20 sccm, the negative bias power supply voltage is 700 V, and the surface of the above-mentioned substrate is cleaned by argon plasma bombardment for 10 minutes to remove the surface oxide and improve the surface energy of the substrate, which can improve the quality of the coating and the substrate. adhesion between sheets;

[0049] (3) Utilize high vacuum intermediate frequency magnetron sputtering to deposit Niobium pentoxide coating layer A on the above-mentioned substrate, the flow rate of argon gas is 120sccm, the flow rate o...

Embodiment 2

[0053] Provided is a light guide plate with a function of transmitting infrared rays and reflecting visible light. The substrate is made of polycarbonate (PC) and has a thickness of 0.36 mm. The preparation method includes the following steps:

[0054] (1) Nitrogen purges the surface of the substrate for 3 minutes to remove impurities of larger particles;

[0055] (2) The vacuum degree of the coating chamber is 0.1 mbar, the flow rate of argon gas is 20 sccm, the negative bias power supply voltage is 700 V, and the surface of the above-mentioned substrate is cleaned by argon plasma bombardment for 10 minutes to remove the surface oxide and improve the surface energy of the substrate, which can improve the quality of the coating and the substrate. adhesion between sheets;

[0056] (3) Utilize high vacuum intermediate frequency magnetron sputtering to deposit Niobium pentoxide coating layer A on the above-mentioned substrate, the flow rate of argon gas is 120sccm, the flow rate ...

Embodiment 3

[0060] Provided is a light guide plate with a function of transmitting infrared rays and reflecting visible light. The substrate is made of polycarbonate (PC) and has a thickness of 0.36 mm. The preparation method includes the following steps:

[0061] (1) Nitrogen purges the surface of the substrate for 3 minutes to remove impurities of larger particles;

[0062] (2) The vacuum degree of the coating chamber is 0.1 mbar, the flow rate of argon gas is 20 sccm, the negative bias power supply voltage is 700 V, and the surface of the above-mentioned substrate is cleaned by argon plasma bombardment for 10 minutes to remove the surface oxide and improve the surface energy of the substrate, which can improve the quality of the coating and the substrate. adhesion between sheets;

[0063] (3) Utilize high vacuum intermediate frequency magnetron sputtering to deposit Niobium pentoxide coating layer A on the above-mentioned substrate, the flow rate of argon gas is 120sccm, the flow rate ...

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Abstract

The invention relates to the technical field of LCD (Liquid Crystal Display) backlight sources and the field of fingerprint identification of the LCD backlight sources, in particular to a light guide plate with functions of transmitting infrared rays and reflecting visible light and a backlight module. In order to solve the problem that an existing backlight module cannot transmit infrared rays, the invention provides the light guide plate with the infrared ray transmitting and visible light reflecting functions and the backlight module. The light guide plate sequentially comprises a substrate and a functional layer from top to bottom, the functional layer is an inorganic matter coating, the inorganic matter coating is composed of a high-refractive-index inorganic matter A and a low-refractive-index inorganic matter B, the refractive index of the inorganic matter A is larger than that of the inorganic matter B, and the inorganic matter coating A and the inorganic matter coating B are alternately deposited on the surface of the light guide plate. The deposition sequence is ABABA,..., BAB, and the number of deposition layers is 4-58. The backlight module provided by the invention can transmit infrared rays and reflect visible light, is thinner in thickness and stronger in warping resistance, and can be applied to a fingerprint identification device.

Description

technical field [0001] The present invention relates to the technical field of LCD backlight sources, and at the same time covers the field of fingerprint identification of LCD backlight sources, in particular to a light guide plate and a backlight module with the function of transmitting infrared rays and reflecting visible light. [0002] technical background [0003] With the vigorous development of display technology, people's demand for display screens also tends to be large-area screens (called full screens in the industry). The arrival of the full-screen era has squeezed the position of the current capacitive or ultrasonic fingerprint recognition devices, and the efficient use of the front screen is particularly important. [0004] The under-screen optical fingerprint recognition device solves this problem well, and handles the positional conflict between the full screen and the fingerprint recognition device. [0005] TFT-LCD (thin film transistor liquid crystal disp...

Claims

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Application Information

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IPC IPC(8): G02B6/00G02F1/13357
CPCG02B6/0055G02B6/0065G02F1/133615
Inventor 张彦高斌基夏寅刘建凯付坤李刚唐海江
Owner NINGBO EXCITON TECH
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