Backlight module

Abstract

A backlight module comprises a light guide plate, a light source, an optical film, a first prismatic lens and a second prismatic lens. The light guide plate is provided with a light emitting surface and a light incident surface which are connected. The light source is arranged on one side of the light incident surface of the light guide plate. The optical film is overlapped on the light emitting surface. The optical film comprises a substrate, a plurality of optical microstructures and a first diffusion structure layer. The substrate is provided with a light inlet side and a light outlet side,and the light inlet side faces the light guide plate. The optical microstructures are arranged on the light inlet side. The extending directions of the optical microstructures intersect at the lightincident surface. The first diffusion structure layer is disposed on the light outlet side and overlaps the plurality of optical microstructures. The first prismatic lens and the second prismatic lensare arranged on the optical film in an overlapped mode and located on the light outlet side. The extending directions of the plurality of prism structures of the first prismatic lens intersect with the extending directions of the plurality of prism structures of the second prismatic lens. The backlight module has the advantages of being high in assembling yield and good in light collecting performance.

Description

technical field [0001] The present invention relates to an optical module, and in particular to a backlight module. Background technique [0002] With the increasing application of non-self-luminous displays such as liquid crystal displays, the design of the backlight module also needs to be adjusted for different usage scenarios. In order to improve the light energy utilization efficiency of the light source, the backlight module equipped with an optical Brightness Enhancement Film (BEF) has become one of the mainstreams in the market. Generally speaking, this type of backlight module is equipped with a laminated structure of two optical brightness enhancement films (such as two prism sheets whose extending directions of prisms are perpendicular to each other), which can guide the light beam emitted by the light guide plate at a large angle to cover the normal viewing angle. within a certain range of angles to improve the overall light intensity of the backlight module nea...

AI Technical Summary

Problems solved by technology

However, from another point of view, when using this type of light-collecting backlight module, when there are detailed defects or tiny foreign objects (such as dust or lint brought in during assembly) between the film layers of the backlight module, in the subsequent It is easy to be detected during the optical inspection process of quality control

In other words, this type of backlight module with excellent light-collecting performance is also poor in concealment of subtle defects, resulting in a decrease in the overall assembly yield

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