Backlight unit having a lens with refraction and reflection portions

Abstract

A display device is provided. The display device includes: a substrate; and at least one light assembly separately located on the substrate, wherein the light assembly includes: a light source; and a lens configured to shield an upper surface and a side surface of the light source, wherein the lens includes: a refraction portion separately located on the upper surface of the light source; and a reflection portion separately located at the side surface of the light source. Thereby, the lens includes a reflection portion located at a side surface of the light source, thereby improving light efficiency of a backlight unit.

What is claimed is: 
     
       1. A backlight unit, comprising:
 a substrate; and 
 at least one light assembly separately located on the substrate, 
 wherein the light assembly comprises:
 a light source; and 
 a lens configured to shield an upper surface and a side surface of the light source, 
 
 wherein the lens comprises:
 a refraction first portion separately located on the upper surface of the light source, wherein the first portion refracts light emitted from the light source; and 
 a reflection second portion separately located at the side surface of the light source, wherein the second portion changes an advancing direction of light emitted from the light source, and  
 
 wherein the refraction first portion comprises:
 a convex portion having a hemisphere shape protruded upward; and 
 a side portion extended from a lower portion of the convex portion, and 
 
 wherein a diameter of the reflection second portion is smaller than a diameter of the side portion, and 
 wherein the second portion includes an electrostatic portion located at an external side diameter of the second portion. 
 
     
     
       2. The backlight unit of  claim 1 , wherein the refraction first portion and the reflection second portion are coupled by an adhesive layer. 
     
     
       3. The backlight unit of  claim 1 , wherein the refraction first portion and the reflection second portion are coupled by a double injection process. 
     
     
       4. The backlight unit of  claim 1 , wherein the side portion has a cylindrical shape. 
     
     
       5. The backlight unit of  claim 4 , wherein the reflection second portion has a cylindrical shape. 
     
     
       6. The backlight unit of  claim 5 , wherein the side portion includes an annular bottom surface,
 wherein the annular bottom surface faces the substrate, and 
 wherein the annular bottom surface surrounds an upper side of the reflection portion. 
 
     
     
       7. The backlight unit of  claim 1 , wherein the reflection second portion further comprises:
 a central hole configured to penetrate a central portion; and  
 a pad located at an outer edge of the central hole; and 
 an electrostatic portion located at an external side diameter of the reflection portion. 
 
     
     
       8. The backlight unit of  claim 7 , wherein the pad has a shape depressed into the reflection second portion. 
     
     
       9. The backlight unit of  claim 8 , wherein in the pad, a metal is inserted into a depressed portion, and
 the pad is formed through an insert injection process of the metal. 
 
     
     
       10. The backlight unit of  claim 9 , wherein the metal and the substrate are coupled by a Surface Mount Technology (SMT) process. 
     
     
       11. The backlight unit of  claim 7 , wherein the pads are located at both sides of the central hole. 
     
     
       12. The backlight unit of  claim 7 , wherein the pad has a ring shape that encloses the central hole. 
     
     
       13. The backlight unit of  claim 7 , wherein the electrostatic portion has a shape depressed into the reflection portion, and
 a zener diode is inserted into a depressed portion. 
 
     
     
       14. The backlight unit of  claim 7 , wherein the reflection second portion has a protrusion therein. 
     
     
       15. The backlight unit of  claim 7 , wherein the reflection portion is inclined inward. 
     
     
       16. A display device, comprising:
 the backlight unit of  claim 1 ; 
 a display panel located at a front surface of the a backlight unit; and 
 a back cover located at a rear surface of the backlight unit, 
 wherein the backlight unit comprises: 
 a substrate; and 
 at least one light assembly separately located on the substrate, 
 wherein the light assembly comprises: 
 a light source; and 
 a lens configured to shield an upper surface and a side surface of the light source, 
 wherein the lens comprises: 
 a first portion separately located on the upper surface of the light source; and 
 a second portion separately located at the side surface of the light source, 
 wherein the first portion comprises: 
 a convex portion having a hemisphere shape protruded upward; and 
 a side portion extended from a lower portion of the convex portion, 
 wherein a diameter of the second portion is smaller than a diameter of the side portion, and 
 wherein the second portion includes an electrostatic portion located at an external side diameter of the second portion. 
 
     
     
       17. The display device of  claim 16 , wherein the refraction first portion and the reflection second portion are coupled by an adhesive layer. 
     
     
       18. The display device of  claim 16 , wherein the refraction first portion and the reflection second portion are coupled by a double injection process. 
     
     
       19. The display device of  claim 16 , wherein the reflection portion is inclined inward.