Total-reflection ultrathin backlight lens

The utility model discloses a total-reflection ultrathin backlight lens. Plane mirror, a plurality of groups of unit lenses are arranged on one side of the plane mirror; the utility model discloses atotal-reflection ultrathin backlight lens. Light in the middle of the LED lamp is refracted out through the Fresnel lens structure in the groove. The direction is perpendicular to the plane mirror; light emitted to the periphery by the LED lamp is refracted to the reflecting surface from the straight line and the convex arc line; then the light is reflected by the reflecting surface; no convex arcline is arranged; the light scattered to the periphery by the LED lamp needs to use a large reflecting surface, so that the thickness of the lens is large, an arc line is equivalent to a convex mirror, a large refraction angle can be generated, the needed reflecting surface is reduced, the thickness of the lens is reduced, and the energy loss of the light is reduced due to the reduction of the thickness. 本实用新型公开了一种全反射超薄背光