Light emitting device package, light source module, backlight unit, display apparatus, television set, and illumination apparatus

Abstract

A light source module, a backlight unit, a display apparatus, a television set, and an illumination apparatus are provided. The light source module includes: one or more light source units including a light emitting element emitting light when electricity is applied thereto; and an optical sheet disposed above the light source units and exhibiting bidirectional transmittance distribution function characteristics having first and second peaks at radiation angles less than 0° and greater than 0°.

1 . A light emitting device package comprising:
 at least one light emitting element;   a lead frame including a rough surface to scatter at least a part of light emitted from the at least one light emitting element which is disposed thereon; and   a light-transmissive resin covering at least a portion of the lead frame and the at least one light emitting element and having a concave portion   
     
     
         2 . The light emitting device package of  claim 1 , wherein the rough surface of the lead frame has a GAM index of 0.4 to 1.0. 
     
     
         3 . The light emitting device package of  claim 1 , wherein the rough surface of the lead frame has a roughness on a micron scale or less. 
     
     
         4 . The light emitting device package of  claim 1 , wherein the light-transmissive resin includes a convex portion disposed above the at least one light emitting element, so that the concave portion is disposed in the convex portion. 
     
     
         5 . The light emitting device package of  claim 4 , wherein a diameter of the concave portion is smaller than a maximum diameter of the convex portion. 
     
     
         6 . The light emitting device package of  claim 4 , wherein center points of the convex portion and the concave portion are aligned with each other. 
     
     
         7 . The light emitting device package of  claim 6 , wherein the at least one light emitting element is disposed on a center line of the convex portion and the concave portion. 
     
     
         8 . The light emitting device package of  claim 1 , wherein the light-transmissive resin includes a wavelength conversion material. 
     
     
         9 . The light emitting device package of  claim 1 , further comprising: a wavelength conversion layer including at least one of a phosphor and a quantum dot. 
     
     
         10 . The light emitting device package of  claim 9 , wherein the wavelength conversion layer is disposed in the light-transmissive resin separately from the at least one light emitting element. 
     
     
         11 . The light emitting device package of  claim 10 , wherein an average distance between the wavelength conversion layer and the at least one light emitting element is more than 500 um. 
     
     
         12 . A light emitting device package comprising:
 at least one light emitting element;   a lead frame including a surface on which the at least one light emitting element is disposed; and   a light transmissive resin covering at least a portion of the lead frame and the at least one light emitting element,   wherein a luminance of the light emitting device package has a substantially uniform value in a range in which a radiation angle is less than 20° and has a maximum value in a range in which the radiation angle is more than 50°, based on a disposition area of the at least one light emitting element.   
     
     
         13 . The light emitting device package of  claim 12 , wherein a ratio between the luminance in the range in which the radiation angle is less than 20° and the luminance in the range in which the radiation angle is more than 50° is in a range of 0.29 to 0.34. 
     
     
         14 . A backlight unit comprising:
 a light emitting device package including at least one light emitting element, a lead frame including a rough surface to scatter at least a part of light emitted from the at least one light emitting element which is disposed thereon, and a light transmissive resin covering at least a portion of the lead frame and the at least one light emitting element and having a concave portion;   a substrate having a circuit pattern electrically connected with the light emitting device package which is mounted thereon; and   a diffusion sheet disposed on the substrate and diffusing a light from the light emitting device package uniformly.