阅读说明：本技术 一种Mini-LED背光模组光学反射膜的制备方法 (Preparation method of Mini-LED backlight module optical reflection film ) 是由 罗培栋 华雨莎 于 2021-09-03 设计创作，主要内容包括：一种Mini-LED背光模组光学反射膜的制备方法,其特征在于包括下列步骤：S1：将下列组分按照质量份数熔融混合造粒,得到A层料粒：PET8质量份,硅藻土颗粒1质量份,纳米银1质量份；S2：将下列组分按照质量份数熔融混合造粒,得到B层料粒：PET8质量份,纳米级间位芳纶纤维,2质量份；S3：A层料粒与B层料粒在三层挤出夹头挤出流延,再双向拉伸,冷却后形成两层A层膜将B层膜夹于中间的三层反射膜结构。本发明采用上述A、B层料的组成及配比,可获得更好的反光率,并且意外的发现热收缩以及表面电阻性能也得到了极大的改善。(A preparation method of an optical reflection film of a Mini-LED backlight module is characterized by comprising the following steps: s1: melting, mixing and granulating the following components in parts by mass to obtain layer A material particles: PET8 parts by mass, diatomite particles 1 part by mass and nano silver 1 part by mass; s2: melting, mixing and granulating the following components in parts by mass to obtain B-layer material granules: 2 parts of PET8, and 2 parts of nano-grade meta-aramid fiber; s3: extruding and casting the material particles of the layer A and the material particles of the layer B in a three-layer extrusion chuck, performing biaxial tension, and cooling to form a three-layer reflecting film structure with two layers of film A and a film B sandwiched in the middle. The invention adopts the composition and the proportion of the A, B-layer material, can obtain better light reflection rate, and unexpectedly discovers that the heat shrinkage and the surface resistance performance are also greatly improved.)

1. A preparation method of an optical reflection film of a Mini-LED backlight module is characterized by comprising the following steps:

s1: melting, mixing and granulating the following components in parts by mass to obtain layer A material particles:

PET8 parts by mass

1 part by mass of diatomite particles

1 part by mass of nano silver;

s2: melting, mixing and granulating the following components in parts by mass to obtain B-layer material granules:

PET8 parts by mass

2 parts by mass of nano-grade meta-aramid fiber

S3: extruding and casting the material particles of the layer A and the material particles of the layer B in a three-layer extrusion chuck, performing biaxial tension, and cooling to form a three-layer reflecting film structure with two layers of film A and a film B sandwiched in the middle.

2. The method for preparing the optical reflective film for a Mini-LED backlight module of claim 1, wherein the method comprises the following steps: the thickness ratio of the A layer film to the B layer film is 1: 9.

Technical Field

The invention relates to a preparation method of an optical reflecting film of a Mini-LED backlight module.

Background

Micro-LED is a new generation display technology, and compared with the existing OLED technology, the Micro-LED has the advantages of higher brightness, better luminous efficiency, longer service life and lower power consumption. The Micro-LED device is a highly miniaturized and integrated gallium nitride Micro-light emitting device, and only light emitting surfaces of an inverted structure and a front-mounted structure are different according to a Micro-LED assembly structure. The Micro-LED light source emits light towards four sides, and the installation of the reflecting structure can improve the utilization rate of the light rays (Journal of Semiconductors, 2014(07):101-105.）。

The Mini-LED has two main applications in display, one is used as a self-luminous Mini RGB display, similar to the small-pitch LED, and because no gold wire is required in the packaging form, the Mini-LED can perform smaller dot pitch display even on the same chip size as the small-pitch LED. The other is the application in backlight, and compared with the traditional backlight LED module, the Mini-LED backlight module adopts denser chip arrangement to reduce the light mixing distance, so that the ultrathin light source module is realized, and in addition, the Mini-LED has better contrast and HDR display effect by matching with backlight drive control. In contrast, the former has difficulties of low yield, high cost, etc., and the Mini-LED is used as a backlight to display a picture in combination with a liquid crystal panel, which is the current mainstream application direction.

Compared with the traditional LED backlight LCD TV, the LCD TV adopting the Mini-LED backlight technology has better performance on dynamic contrast, brightness, color gamut and visual angle, and has the advantages of lightness, thinness, high image quality, low power consumption, energy conservation and the like.

How to improve the optical performance of the reflective film, improve the reflectivity and reduce the optical loss is an important subject to be solved urgently in the field of miniLED display, and the reflectivity of various reflective films prepared by the existing process is still to be improved.

Disclosure of Invention

In order to overcome the defects of the optical reflecting film of the existing Mini-LED backlight module, the invention provides a preparation method of the optical reflecting film of the Mini-LED backlight module, which can improve the reflectivity.

The technical scheme for solving the technical problem is as follows: a preparation method of an optical reflection film of a Mini-LED backlight module comprises the following steps:

s1: melting, mixing and granulating the following components in parts by mass to obtain layer A material particles:

PET8 parts by mass

1 part by mass of diatomite particles

1 part by mass of nano silver;

s2: melting, mixing and granulating the following components in parts by mass to obtain B-layer material granules:

PET8 parts by mass

2 parts by mass of nano-grade meta-aramid fiber

S3: extruding and casting the material particles of the layer A and the material particles of the layer B in a three-layer extrusion chuck, performing biaxial tension, and cooling to form a three-layer reflecting film structure with two layers of film A and a film B sandwiched in the middle.

Preferably, the thickness ratio of the A layer film to the B layer film is 1: 9.

The invention has the beneficial effects that: by adopting the composition and the proportion of the A, B-layer material, better light reflection rate can be obtained, and the heat shrinkage and surface resistance performance are also improved greatly.

Detailed Description

The present invention will be described in further detail with reference to examples.

A preparation method of an optical reflection film of a Mini-LED backlight module comprises the following steps:

s1: melting, mixing and granulating the following components in parts by mass to obtain layer A material particles:

PET8 parts by mass

1 part by mass of diatomite particles

1 part by mass of nano silver;

s2: melting, mixing and granulating the following components in parts by mass to obtain B-layer material granules:

PET8 parts by mass

2 parts by mass of nano-grade meta-aramid fiber

S3: extruding and casting the material particles of the layer A and the material particles of the layer B in a three-layer extrusion chuck, performing biaxial stretching, cooling, and forming a three-layer reflecting film structure with two layers of film A and a film B sandwiched in the middle, wherein the thickness ratio of the film A to the film B is 1: 9.

The invention adopts the composition and the proportion of the A, B layer material, can obtain better light reflection rate, and unexpectedly finds that the heat shrinkage and the surface resistance performance are also greatly improved, and the comparison with the heat shrinkage ratio and the surface resistance of the common optical reflecting film is shown in the following table:

optical reflective film	Thermal shrinkage	Surface resistance
			Common PET reflective film	0.5/0.3	1016
The PET reflecting film prepared by the invention	0.1/0.05	109