Patent ID: 9671644
Date: 2017-06-06
CPC Classifications: G02F

Claim:
1. A direct backlight module, comprising: a back plate, a backlight source mounted on the back plate, and a plurality of double lens structures mounted on the back plate and over the backlight source, the backlight source including a plurality of LED bars, wherein the double lens structures are axisymmetrical and correspond to the LED bars, respectively, and each of the double lens structures has an axis coincides with that of the corresponding LED bar, wherein each of the double lens structures includes a first refraction structure, a second refraction structure disposed opposite to and below the first refraction structure, and an inner cavity formed between the first refraction structure and the second refraction structure, and the first refraction structure has an axis coincides with that of the second refraction structure, and wherein the first refraction structure has a bottom surface being a light exiting surface, the second refraction structure has a bottom surface being a light incidence surface, the light exiting surface and the light incidence surface are circular flat planes, and the light incidence surface has an area smaller than that of the light exiting surface.