Backlight module and liquid crystal display device using the backlight module

Abstract

The invention relates to a backlight module and a liquid crystal display device using the backlight module. The backlight module includes a back plate and an optical film arranged on the back plate, wherein a lug for location is arranged on the optical film, and includes a root part and an expansion part extending outwards; the width of the expansion part is larger than that of the root part; a first bump is arranged on the sidewall of the back plate; an opening is formed on the first bump; the root part of the lug of the optical film is accommodated in the opening; a second bump is arranged on the sidewall of the back plate and includes an extension part; and the expansion part of the lug of the optical film is accommodated below the extension part of the second bump. By arranging the second bump on the back plate, the extension part of the second bump can prevent the lug of the optical film from moving in a direction vertical to the plane of the optical film; the second bump can be arranged at a low cost; and the optical film is simple in installation and can save time and effort.

Description

technical field [0001] The invention relates to the field of liquid crystal display, more specifically, to a backlight module and a liquid crystal display device using the backlight module. Background technique [0002] Liquid crystal display devices need to use backlight modules and liquid crystal panels. Some optical films need to be used in the backlight modules. Such optical films can play the role of fogging and brightening. , it is necessary to position the above-mentioned optical film. For example, the patent No. 200410091576.X, the Chinese invention patent titled the combined structure of the optical film and the plastic frame mentions various positioning structures. The optical film in the prior art They are all positioned on the plastic frame. Because the optical film is generally thin, about 0.1-0.6mm, small and medium-sized backlight modules generally adopt leaning positioning, but in large-sized backlight modules, due to the relatively small size of the optical ...

AI Technical Summary

Problems solved by technology

However, the above two positioning methods have not solved the positioning of the optical film in the vertical direction of the optical film plane, which may cause the warping of the optical film. Usually, small-sized backlight modules can use adhesive tape due to the small deformation of the optical film. Paste the optical film on the plastic frame, but the adhesive tape method is not suitable for large-size backlight modules, because the places where the optical film can be pasted are very limited, and the adhesive force of the tape is likely to be insufficient, and there will be certain hidden dangers. Backlight modules generally use elastic metal sheets to clamp the optical film on the plastic frame, but elastic metal sheets are expensive and do not have cost advantages

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