Light-emitting device and backlight module using the same

Abstract

A light-emitting device is provided. The light-emitting device includes a substrate having a long edge and a short edge, at least one electrode pad assembly, and at least one light-emitting element. The at least one electrode pad assembly is disposed on the substrate and includes a first electrode pad and a second electrode pad. The at least one light-emitting element has a plurality of electrodes electrically connected to the first electrode pad and the second electrode pad of the at least one electrode pad assembly. The first electrode pad and the second electrode pad are arranged along a direction parallel to the short side.

What is claimed is: 
     
         1 . A backlight module, comprising:
 an optics layer having a light-incoming surface and a light-outgoing surface; and   a light-emitting device facing the light-incoming surface and comprising:   a substrate having a long side and a short side and a plurality of electrode pad assemblies disposed on the substrate, wherein each of the electrode pad assemblies comprises a first electrode pad and a second electrode pad arranged along a direction parallel to the short side; and   a plurality of light-emitting elements flipped on the substrate, each light-emitting element comprising:   a light emitting diode having a plurality of electrodes connected to the first electrode pad and the second electrode pad of one of the electrode pad assemblies;   a white reflective layer attached to a side surface of the light emitting diode and exposed the electrodes and a top surface of the light emitting diode, wherein the white reflective layer has a flat lateral surface, and a bottom surface of the white reflective layer is higher than bottom surfaces of the electrodes; and   a phosphor layer at least disposed on the top surface of the light emitting diode.   
     
     
         2 . The backlight module according to  claim 1 , wherein each of the first electrode pad and the second electrode pad of each of the electrode pad assemblies has a long side and a short side, the long side of the first electrode pad and the long side of the second electrode pad are parallel to the long side of the substrate, and the short side of the first electrode pad and the short side of the second electrode pad are parallel to the short side of the substrate. 
     
     
         3 . The backlight module according to  claim 1 , wherein the substrate comprises:
 an metal base layer;   an insulation layer disposed on the metal base layer;   a plurality of metal layers disposed on the insulation layer; and   a solder resist layer interposed between the metal layers;   wherein the metal layers form the first electrode pad and the second electrode pad.   
     
     
         4 . The backlight module according to  claim 1 , wherein the bottom surface of the white reflective layer is not lower than a bottom surface of the light emitting diode. 
     
     
         5 . The backlight module according to  claim 1 , wherein the light-emitting device further comprises:
 a plurality of dome-shaped sealing structures covering the light-emitting elements.   
     
     
         6 . The backlight module according to  claim 1 , wherein the phosphor layer is disposed on the white reflective layer and has a flat lateral surface flush with the flat lateral surface of the white reflective layer. 
     
     
         7 . The backlight module according to  claim 6 , wherein the phosphor layer comprises a high-density conversion layer and a low-density conversion layer, and the high-density conversion layer is interposed between the at least one light-emitting element and the low-density conversion layer. 
     
     
         8 . The backlight module according to  claim 1 , wherein the light-emitting device further comprises:
 a filling structure infused between the substrate and the light-emitting elements.   
     
     
         9 . The backlight module according to  claim 1 , wherein each of the light-emitting elements further comprises a light transmissive layer disposed on the phosphor layer. 
     
     
         10 . A display, comprising
 a backlight module according to  claim 1 , and   a display panel disposed on the backlight module to receive a light emitted from the light-outgoing surface of backlight module.