Patent ID: 7424905

Claim:
A window blind, comprising: a top support adapted for supporting at a window ceiling; a bottom support spacedly disposed underneath said top support; a plurality of slats spacedly disposed between said top and bottom support; a folding unit comprising a pulley system supported by said top support and an elongated cord having a lifting portion extended from said top support to engage with said pulley system and a folding portion extended from said top support to said bottom support to suspendedly support said slats in such a manner that when said lifting portion of said elongated cord is pulled from said top support, said bottom support is lifted up towards said top support to overlap with said slats between said top and bottom supports; and a supplement blind enhancement, which comprises: a plurality of enhancing blades disposed between said top and bottom supports, wherein each of said enhancing blades is positioned between every two adjacent said slats; a control system comprising a control slider slidably mounted at said top support, a blade controller extended from said control slider to slidably shift said control enhancing blades between a light shading position and a light enhancing position, and two elongated elements extended from said control slider to engage with two end portions of each of said enhancing blades respectively, wherein at said light shading position, said control slider is driven to slide that said enhancing blades are suspendedly disposed between said slats in an alternating manner for substantially blocking sunlight passing through a gap between each two said slats, and at said light enhancing position, said control slider is driven to slide that each of said enhancing blades to overlap with said respective slat for allowing said sunlight passing through said gap between each to said slats, wherein said control slider comprises two tackles spacedly and slidably mounted at said top support to connect with said elongated elements respectively such that when said blade controller drives said two tackles to slide along said top support at one direction, said enhancing blades are overlapped with said slats for allowing said sunlight passing through said gaps between said slats, and when said blade controller drives said two tackles to slide along said top support at an opposed direction, said enhancing blades are suspendedly disposed between said slats for substantially blocking sunlight passing through said gap between two said slats, and wherein said top support comprises an axial shaft extending longitudinally that said two tackles are guided to slide along said axial shaft to move said control enhancing blades between said light shading position and said light enhancing position.