Backlight module and display device

Abstract

A backlight module includes: a back panel, a light source unit, a middle frame, and a front frame. The back panel has a plurality of sidewalls forming an accommodating space, with a gap between two adjacent sidewalls. The light source unit is located within the accommodating space. The middle frame has at least one positioning protrusion extending into the gap to confine it to the back panel. The front frame covers the sidewalls and the at least one positioning protrusion. The gap in the back panel can serve as a mounting and positioning structure for the middle frame, while reducing light leakage of the backlight module.

Claims

1. A backlight module, comprising: a back panel having a plurality of sidewalls forming an accommodating space, wherein a gap is formed between two adjacent sidewalls; a light source unit located within the accommodating space; a middle frame having at least one positioning protrusion extending into the gap to be confined within the back panel; and a front frame covering the sidewalls and the at least one positioning protrusion; wherein, The middle frame constructs a reflective structure, which is located within the accommodating space and disposed on the light source unit.

2. The backlight module as described in claim 1, wherein the back panel further includes a connecting portion connected between the two adjacent sidewalls, and the positioning protrusions rest on the connecting portion.

3. The backlight module as described in claim 1, wherein the backlight module is a direct-lit backlight module, the reflective structure has a plurality of perforations, the light source unit has a lamp plate and a plurality of light sources arranged in a matrix on the lamp plate, and the light sources pass through the perforations respectively.

4. The backlight module as described in claim 1, further comprising an optical assembly located between the middle frame and the front frame.

5. The backlight module as described in claim 4, wherein the optical assembly is surrounded by the sidewall.

6. The backlight module as claimed in claim 1, wherein the positioning protrusions have an upper end face, the middle frame has an upper surface for supporting an optical assembly, and the upper end face of the positioning protrusions is higher than the upper surface of the middle frame to cover the corners of the optical assembly.

7. A backlight module, comprising: a back panel having a plurality of sidewalls forming an accommodating space, wherein a gap is formed between two adjacent sidewalls; a light source unit located within the accommodating space; a middle frame having at least one positioning protrusion extending into the gap to be confined within the back panel; and a front frame covering the sidewalls and the at least one positioning protrusion; and an optical assembly located between the middle frame and the front frame; wherein, The upper end face of these positioning protrusions is located on the same plane as the upper surface of the optical assembly.

8. A backlight module, comprising: a back panel having a plurality of sidewalls forming an accommodating space, wherein a gap is formed between two adjacent sidewalls; a light source unit located within the accommodating space; a middle frame having at least one positioning protrusion extending into the gap to be confined within the back panel; and a front frame covering the sidewalls and the at least one positioning protrusion; wherein, The thickness of these positioning protrusions protruding outward from the back plate is substantially the same as the thickness of the side wall.

9. A display device comprising: a backlight module as described in any one of claims 1 to 8; and a display panel located above the backlight module.

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