Patent ID: 9465205
Filing Date: 2016-10-11
CPC Classification: F21V,G02B

Claim Text:
1. A backlight module comprising: an LED light source; and an optical lens optically coupled to the LED light source for diverging light emitted therefrom, the optical lens comprising a first optical surface located at a bottom thereof, a third optical surface located at a top thereof and arranged oppositely to the first optical surface, and a second optical surface located at a lateral side thereof and extending between the first optical surface and the third optical surface; wherein the third optical surface is recessed downwardly towards the first optical surface and surrounded by the second optical surface; wherein the light emitted from the LED light source enters into the optical lens through the first optical surface, most of the entering light is directly refracted out of the optical lens through the second optical surface and at least a part of the entering light that strikes the third optical surface is first reflected by the third optical surface towards the second optical surface via total internal reflection and then refracted out of the optical lens through the second optical surface; and wherein the first optical surface comprises a top wall and a cylindrical inner wall extending downwardly from the top wall, and the top wall and the cylindrical inner wall cooperatively form a receiving cavity for accommodating the LED light source, the LED light source is arranged under the receiving cavity and a top of the LED light source covers an opening of the receiving cavity.