A kind of backlight module and display device

Abstract

Embodiments of the present invention provide a backlight module and a display device, which relate to the field of display technology and can reduce display defects caused by prism deformation. The backlight module includes a frame, a light guide plate, a diffusion film, a second prism film, a first prism film, a light bar, and a light-shielding tape; the first prism film includes a first main body part and a first lug; the second prism film includes a second prism film Two main parts and a second lug; the diffusion film does not overlap with the first and second lugs; on the side close to the light bar, the first lug is located above the second lug; the frame includes four side walls; Except for the light bar side, the tops of the other three side walls are all lower than the top of the prism in the first main body, and the height difference is smaller than the thickness of the light-shielding tape; the light-shielding tape does not contact the first main body; the light-shielding tape is pasted at least close to the light bar The absolute value of the thickness difference between the side wall, the light bar and the first lug, and the light-shielding tape and the diffusion film is smaller than the thickness of the light-shielding tape. Used in the preparation of backlight modules and display devices.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a backlight module and a display device. Background technique [0002] A liquid crystal display (LCD) generally includes a display panel (Panel) and a backlight module. Below the back-shaped black light-shielding tape outside the backlight module are an upper prism film and a lower prism film in sequence, and the upper prism film is bonded to the lower polarizer in the display panel through the light-shielding tape. [0003] In order to ensure the stickiness of the light-shielding tape, the light-shielding tape usually has a certain thickness, so that there is a large gap between the upper prism film and the lower polarizer. When laminating, the upper prism film and the lower polarizer (POL) of the display panel will generate electrostatic adsorption. Due to the large gap (Gap) between the two, the shape of the upper prism film is convex. The opening area in the middle of the...

AI Technical Summary

Problems solved by technology

Due to the large gap (Gap) between the two, the shape of the upper prism film is convex

The opening area in the middle of the light-shielding tape is usually rectangular, and the convex deformation of the prism will also form a rectangle with rounded corners. Due to the influence of the adsorption area, it will also appear circular, oval and other shapes, which will affect the display effect.

[0004] Moreover, a large gap will also cause irregular arching between the upper prism film and the lower prism film of the display device after corresponding tests, resulting in a sudden change in the prism pitch (Pitch) at the edge of the deformed junction, resulting in a change in the angle of the outgoing light , produce interference, so that the display area of ​​the display device appears a circular display uneven phenomenon, accompanied by rainbow texture, that is, the Newton ring (or called "Newton ring") phenomenon

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