RELATED APPLICATION

The present application claims the benefit of Chinese Patent Application No. 201811398322.0, filed on Nov. 22, 2018, the content of which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the field of display technology, and in particular, to a light collimating thin film and its application. More specifically, the present disclosure relates to a light collimating thin film, an edge-type backlight module, a liquid crystal display device, and a micro light emitting diode display device.

BACKGROUND

With the development of technology, the security of information is becoming more and more important. Therefore, in order to prevent personal privacy and important information from being peeped by somebody who had bad motives, more and more peep-proofing technologies are applied to displays, such as bank ATM (Automated Teller Machine), self-service ticketing terminal, and the like. However, the peep-proofing effects of conventional displays are relatively poor. For personal terminal mobile display products such as mobile phones and laptops, the applications of the peep-proofing technologies are not developed.

SUMMARY

According to an aspect of the present disclosure, there is provided a light collimating thin film comprising a substrate having a first substrate and a second surface that are opposed to each other, and a plurality of conical structures respectively penetrating the substrate, wherein axes of the plurality of conical structures are respectively perpendicular to the first surface and the second surface.

In some embodiments, a cross section of each of the plurality of conical structures within the first surface is a first cross section, and a cross section of each of the plurality of conical structures within the second surface is a second cross section, wherein the second cross section is configured to receive light to be collimated, and an area of the first cross section is larger than an area of the second cross section.

In some embodiments, each of the plurality of conical structures comprises a hole, and an inner wall of the hole is covered with a first reflective layer.

In some embodiments, each of the plurality of conical structures is filled up with a conical material, and a refractive index of the conical material is greater than a refractive index of a material of the substrate.

In some embodiments, the material of the substrate comprises polyethylene terephthalate.

In some embodiments, a portion of the second surface of the substrate other than the second cross section is provided with a second reflective layer.

In some embodiments, a shape of a cross section of each of the plurality of conical structures in a plane perpendicular to the axes has a shape of circular.

In some embodiments, a bottom angle of each of the plurality of conical structures ranges from 75° to 850°.

In some embodiments, a diameter of the first cross section ranges from 0.15 mm to 0.20 mm, and a diameter of the second cross section ranges from 0.05 mm to 0.10 mm.

In some embodiments, a height of each of the plurality of conical structures along a direction perpendicular to the first surface ranges from 0.2 mm to 0.4 mm.

In some embodiments, a cross section of each of the plurality of conical structures in a plane perpendicular to the axes has a shape of rhombus.

In some embodiments, the plurality of conical structures are arranged in an array, wherein the plurality of conical structures comprise two adjacent conical structures, and a distance between the two adjacent conical structures ranges from 0.10 mm to 0.25 mm.

According to another aspect of the present disclosure, there is provided an edge-type backlight module, comprising the light collimating thin film according to any of the embodiments of the present disclosure, a light guide plate on the second surface of the light collimating thin film, and a light source at a light incident surface of the light guide plate.

According to yet another aspect of the present disclosure, there is provided a liquid crystal display device comprising the edge-type backlight module according to any one of the embodiments of the present disclosure.

According to still another aspect of the present disclosure, there is provided a micro light emitting diode display device comprising a display substrate and the light collimating thin film according to any one of the embodiments of the present disclosure, wherein a side of the display substrate is provided with a plurality of micro light emitting diodes, and wherein the light collimating thin film covers the plurality of micro light emitting diodes, and each of the plurality of micro light emitting diodes is arranged at a geometric center of the second cross section of a corresponding one of the plurality of conical structures.

