Brightness enhancement film and backlight module

Abstract

The invention discloses a brightness enhancement film and a backlight module. The brightness enhancement film comprises a light transmission substrate, a plurality of lenses and a reflection layer. The light transmission substrate is provided with a first surface and a second surface which are opposite. The lenses are collocated on the first surface, wherein each lens is provided with a bent convex side back to the light transmission substrate. The curvature radius of the bent convex side in the first direction parallel to the first surface is R1, the curvature radius of the bent convex side in the second direction parallel to the first surface is R2, and the R1 is not equal to the R2. The reflection layer is collocated on the second surface, wherein the reflection layer is provided with a plurality of light transmission open pores, and the light transmission open pores are positioned on the optical axes of the lenses respectively. The distance between the vertex of the bent convex side of the lens and the corresponding light transmission open pore is L, the refractive indexes of the lenses are n, and the brightness enhancement film satisfies the conditions that L is less than nR1/(n-1) and L is less than nR2/(n-1). The backlight module using the brightness enhancement film is also provided.

Description

technical field [0001] The present invention relates to an optical film and a light source module using it, and in particular to a brightness enhancement film (BEF) and a backlight module using it. Background technique [0002] With the advancement of display technology, flat panel displays have become the mainstream of display devices to replace traditional heavy cathode ray tubes (cathode ray tubes, CRTs). Among flat panel displays, a liquid crystal display (LCD) is more popular and popular. The liquid crystal display includes a liquid crystal panel and a backlight module. The liquid crystal panel itself does not emit light, but is used to determine the light transmission rate. Therefore, a backlight module is arranged behind the liquid crystal panel as a plane light source for the liquid crystal panel. The optical quality of the planar light source has a great influence on the display quality of the liquid crystal display. For example, in order to display images correct...

AI Technical Summary

Problems solved by technology

However, since liquid crystal displays on different electronic devices (such as mobile phones, notebook computers, monitors, televisions, etc.) have different requirements for brightness distribution in different directions and different viewing angles, the optical film structure of the above two patents is adopted It is difficult for the backlight module to make the light output angle range change with the change of direction, so this design concept is difficult to apply to various types of electronic devices at the same time

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