Light diffusing lens and light emitting device including the same

Abstract

A light diffusing lens having a pointing angle distribution focused toward a lateral direction. The light diffusing lens includes a light entrance part having a concave shape formed inward from a lower part of the optical diffusing lens, a reflection part having a shape which is concave inward from an upper portion of the light diffusing lens and a light exit portion defined by an outer surface of the light diffusing lens. The light entrance part has a first convex surface which is convex in an optical axial direction defined by a straight line passing through the center of the light diffusing lens as the straight line goes toward the inside of the light diffusing lens.

1 - 16 . (canceled) 
     
     
         17 . A light module comprising:
 a substrate for electrical connection;   a light source disposed on the substrate and comprising a first light emitter and a second light emitter; and   a plurality of lenses disposed on the substrate, each lens comprising a light exit portion defined by an outer side surface between an upper surface and a lower surface of the lens,   wherein:   the lower surface of each lens has a light incident portion depressed inwards therefrom at an optical axis defined by a straight line passing through a center of the lens;   the upper surface of each lens has a curved shape depressed toward the optical axis and the light incident portion of the lens;   the light exit portion of each lens comprises a first region and a second region bulging further outward from the optical axis than the first region;   a light emitted through one of the lenses corresponding to the first light emitter has a different beam angle than that of a light emitted through another one of the lenses corresponding to the second light emitter.   
     
     
         18 . The light module of  claim 17 , wherein a distance from an outer boundary of the first region to the optical axis is not constant. 
     
     
         19 . The light module of  claim 17 , wherein a distance from an outer boundary of the second region to the optical axis is not constant. 
     
     
         20 . The light module of  claim 18 , wherein the distance from the outer boundary of the first region to the optical axis increases as the first region extends toward the lower surface. 
     
     
         21 . The light module of  claim 18 , wherein the outer boundary of the first region comprises a flat face. 
     
     
         22 . The light module according to  claim 21 , wherein an angle defined between the flat face of the first region and the lower surface is less than about 90°. 
     
     
         23 . The light module according to  claim 17 , further comprising a reflective sheet disposed on the substrate and reflecting a light emitted from each lens. 
     
     
         24 . The light module according to  claim 21 , wherein the light incident portion includes a first convex face and a second convex face. 
     
     
         25 . The light module according to  claim 24 , wherein the first and second convex faces have different radiuses of curvature. 
     
     
         26 . The light module according to  claim 17 , each of the first light emitter and the second light emitter comprise a light emitting diode chip and a wavelength converter covering the light emitting diode chip. 
     
     
         27 . A display apparatus comprising:
 a substrate for electrical connection;   a light source disposed on the substrate and comprising a first light emitter and a second light emitter;   a plurality of lenses disposed on the substrate, each lens comprising a light exit portion defined by an outer side surface between an upper surface and a lower surface of the lens; and   a reflective sheet reflecting a light emitted from the lenses,   wherein:   the lower surface has a light incident portion depressed inwards therefrom at an optical axis defined by a straight line passing through a center of the lens;   the upper surface has a curved shape depressed toward the optical axis and the light incident portion of the lens;   the light exit portion comprises a first region and a second region bulging further outward from the optical axis than the first region;   the substrate is arranged on a lower surface of the reflective sheet; and   a light emitted through one of the lenses has a different beam angle than a light emitted though at least one of the other lenses.   
     
     
         28 . The display apparatus of  claim 27 , wherein a distance from an outer boundary of the first region to the optical axis is not constant. 
     
     
         29 . The display apparatus of  claim 27 , wherein a distance from an outer boundary of the second region to the optical axis is not constant. 
     
     
         30 . The display apparatus of  claim 27 , wherein the distance from the outer boundary of the first region to the optical axis increases as the first region extends toward the lower surface. 
     
     
         31 . The display apparatus of  claim 27 , wherein the outer boundary of the first region comprises a flat face. 
     
     
         32 . The display apparatus according to  claim 31 , wherein an angle defined between the flat face of the first region and the lower surface is less than about 90°. 
     
     
         33 . The display apparatus according to  claim 27 , the light incident portion includes a first convex face and a second convex face. 
     
     
         34 . The display apparatus according to  claim 33 , wherein the first and second convex faces have different radiuses of curvature. 
     
     
         35 . The display apparatus according to  claim 27 , each of the first light emitter and the second light emitter comprises a light emitting diode chip and a wavelength converter covering the light emitting diode chip. 
     
     
         36 . The display apparatus according to  claim 27 , wherein the substrate is disposed under the reflective sheet.