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Reflection film and backlight for liquid crystal display

A technology of reflective film and inorganic particles, applied in the field of reflective film, can solve the problem of insufficient luminance of reflective film, achieve the effect of improving reflectivity and luminance, and good anti-adsorption ability

Active Publication Date: 2019-07-05
NINGBO CHANGYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of insufficient luminance of reflective films in the current market, the present invention provides a reflective film and a backlight for liquid crystal displays

Method used

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  • Reflection film and backlight for liquid crystal display
  • Reflection film and backlight for liquid crystal display
  • Reflection film and backlight for liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0076] The preparation method of reflective film provided by the invention comprises the steps:

[0077] (1) Cast sheet: Three-layer co-extrusion process is adopted; the polyester resin, inorganic particles, additives, etc. Resin, incompatible resin, inorganic particles, additives, etc. are melted and extruded and introduced into the T-shaped die through a filter; then ABA three-layer co-extrusion is carried out to obtain a molten sheet;

[0078] (2) Stretching to form a film: first stretch the melted sheet obtained in step (1) longitudinally by 2 to 5 times; then transversely stretch by 3 to 5 times, heat-setting, winding, slitting and packaging to obtain a reflective film.

[0079] The reflective film prepared by the present invention is tested according to the following method:

[0080] Reflectance: According to GB / T3979-2008 standard, using ColorQuest XE spectrophotometer (manufactured by Hunterlab), under the condition of D65 light source, the reflectance is tested throu...

Embodiment 1

[0090] The present invention provides a reflective film, the reflective film is an ABA three-layer structure, the B layer includes inorganic particles, and the inorganic particles form cells in the B layer; the B layer also includes an incompatible resin, the The incompatible resin forms cells in the B layer.

[0091] Layer A includes 72.7% PET, 20% silica particles with an average particle size of 3 μm, 2.8% ethylenediamine sulfonate terephthalate antistatic agent, 0.5% 2,6-tertiary butyl-4-methylphenol Hindered phenolic antioxidant, 4.0% MAH grafted SEBS (grafting rate ≥ 0.5%).

[0092] Layer B includes 73.7% PET with an intrinsic viscosity of 0.68dL / g, 5% rutile titanium dioxide inorganic particles with an average particle size of 1 μm, 5% polymethylpentene incompatible resin, and 4.5% with an average particle size of 0.5 μm Barium sulfate inorganic particles, 3.8% calcium carbonate inorganic particles, the average particle size is 0.8 μm, 4% MAH grafted SEBS (grafting rat...

Embodiment 2

[0094] As in the reflective film provided in Example 1, the B layer includes 73.7% PET, the intrinsic viscosity is 0.68dL / g, 5% rutile titanium dioxide inorganic particles, the average particle size is 0.4 μm, and 5% polymethylpentene is incompatible Resin, 4.5% barium sulfate inorganic particles, the average particle size is 2 μm, 3.8% calcium carbonate inorganic particles, the average particle size is 2 μm, 4% MAH grafted SEBS (grafting rate ≥ 0.5%) toughening agent, 2.0% sulfonic acid Ethylenediamine terephthalate antistatic agent, 1% Millad3988 (Milliken Company) nucleating agent, 1% PEG (molecular weight 20000) dispersant, and the percentages are percentages by weight. The thickness of the two A layers accounts for 12% of the total thickness, and the thickness of the B layer accounts for 88% of the total thickness. The thickness of the obtained reflective film is 225 μm, and the relevant properties are shown in Table 1.

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Abstract

The present invention belongs to the field of reflection films and relates to a reflection film and a backlight for a liquid crystal display. The invention aims to solve the problem of insufficient brightness of reflection films on the market at present. The reflection film of the invention is of a three-layer structure including an A layer, a B layer and an A layer; the B layer comprises inorganic particles, wherein the inorganic particles form cells in the B layer; the B layer further comprises incompatible resin, wherein the incompatible resin forms cells in the B layer. The reflection filmprovided by the present invention is improved in the aspects of reflectance and brightness compared with an existing reflection film; the reflection film provided by the present invention also has ananti-adsorption capacity. The reflection film provided by the present invention is very suitable for being used in a backlight device for image display and a reflection sheet for illumination.

Description

technical field [0001] The invention relates to the field of reflective film, and more specifically, the present invention relates to a reflective film and a backlight source for a liquid crystal display. Background technique [0002] As the screen displays of mobile phones and TVs are developing towards large-screen displays, the demand for liquid crystal displays in the market is huge. These liquid crystal displays (LCD) provide illumination light by setting a surface light source called a backlight on the inside. to display. The backlight is mainly composed of light source, light guide plate, and backlight module. The reflective film plays an important role in gaining brightness in the entire backlight module. [0003] While the demand for display equipment is increasing sharply, correspondingly, people have higher requirements for the brightness and refinement of the screen. [0004] The brightness of the screen corresponds to the brightness of the reflective sheet. Mo...

Claims

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Application Information

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IPC IPC(8): G02B5/08G02F1/13357
CPCG02B5/0808G02F1/133605G02F1/133615
Inventor 金亚东徐瑞玉杨承翰
Owner NINGBO CHANGYANG TECH
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