Patent ID: 9606290
Date: 2017-03-28
CPC Classifications: G02B

Claim:
1. A backlight module, comprising: a backboard having at least a positioning convex part protruding from a surface of the backboard; a light guiding plate arranged on the backboard, having a light-near side and a light-far side disposed opposite to each other, and two connecting sides disposed opposite to each other, wherein two ends of each connecting side are connected to the light-near side and the light-far side respectively, and at least one of the connecting sides has at least a concave portion disposed corresponding to the positioning convex part of the backboard, and the concave portion has a first side near the light-near side and a second side near the light-far side; a light source disposed near the light-near side of the light guiding plate; and at least a buffer element interposed between the light-far side of the light guiding plate and the backboard, and the buffer element abuts against the light-far side, wherein when the positioning convex part is engaged with the concave portion, the positioning convex part and the first side of the concave portion are spaced apart by a first distance, and the positioning convex part and the second side of the concave portion are spaced apart by a second distance, wherein the first distance is larger than the second distance; wherein the first distance is 0.4% to 1% of length of one of the connecting sides of the light guiding plate, and the second distance is close to zero.