LENS, LED BACKLIGHT MODULE AND DISPLAY DEVICE

摘要

This invention is suitable for optical technology field. A lens, LED back light module and display device are provided. The lens receives light emitted by the light source through a light incident surface, the light emitted by the light source enters in the lens, a part of the light is refracted from one light exiting surface, a part of the light is reflected from one light exiting surface to another light exiting surface or bottom surface, then is reflected from the another light exiting surface or bottom surface to further another light exiting surface and finally is refracted from the further another light exiting surface, therefore the light emitted by the light source is separated in the lens, and then each light is refracted from different light exiting surface of the lens thereby increasing the light exiting area and the uniformity. The lens of the present invention is suitable for the LED back light modules and display devices.

主权项

1. A lens comprising:
a bottom surface; a light incident surface configured to receive light emitted by the light source; a first convex curved surface used as a first light exiting surface; a first ringy inclined plane used as a second light exiting surface; a second convex curved surface used as a third light exiting surface, wherein the first light exiting surface, the second light exiting surface and the third light exiting surface are successively connected from top to bottom and from inside to outside; the second light exiting surface contacts with the third light exiting surface to form a first step, the light incident surface is an inner concave cambered surface, tangent lines of the generatrixes of the inner concave cambered surface intersect a rotation axis therein to form first included angles; the first light exiting surface is a convex curved surface with a central recess, tangent lines of the generatrixes of the convex curved surface with central recess intersect a rotation axis therein to form second included angles; the second light exiting surface intersects the bottom surface to form a third included angle; the third light exiting surface is an outer convex curved surface, tangent lines of the generatrixes of the outer convex curved surface intersect a rotation axis therein to form fourth included angles.