Multifunctional brightness enhancement film, preparation method thereof and backlight module

Abstract

The invention provides a multifunctional brightness enhancement film. The multifunctional brightness enhancement film comprises a prism layer, a PET base film and a microstructure layer which are in contact in sequence, wherein the microstructure layer is composed of a plurality of ellipsoidal convex points compounded on the surface of the PET base film; the long axis of each ellipsoidal convex point is 5-80 microns; the short axis of each ellipsoidal convex point is 4-60 microns; and the included angle between the long axis of each ellipsoidal convex point and the LED light bar ranges from 0degree to 90 degrees. A diffusion structure (microstructure layer) with directivity is coated on the surface of the optical film by utilizing the characteristic, the optical characteristic is controlled by utilizing the structure and the direction of a light source, a better condensation effect and a better atomization effect are achieved, and the size of the diffusion microstructure is far smaller than the size (generally 200 microns) which can be distinguished by human eyes. Therefore, no matter what the arrangement mode of the structure is, the diffusion effects felt by human eyes are the same. The invention further provides a preparation method of the brightness enhancement film and a backlight module.

Description

technical field

[0001] The invention belongs to the technical field of liquid crystal display backlight modules, and in particular relates to a multifunctional light-increasing film, a preparation method thereof and a backlight module. Background technique

[0002] LCD product is a kind of non-active light-emitting electronic device, which does not have light-emitting characteristics. It must rely on the emission of the light source in the backlight module to obtain display performance. Therefore, the brightness of LCD is determined by its backlight module. It can be seen that the quality of the backlight determines important parameters such as the brightness of the LCD screen, the uniformity of emitted light, and the color scale, and largely determines the luminous effect of the LCD screen.

[0003] The backlight module includes a lighting source, a reflector, a light guide plate, a diffuser, a brightness enhancement film (prism sheet), and a frame. The backlight modules u...

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