Light-emitting device

Abstract

A light-emitting device is provided, which includes a circuit board, a plurality of light-emitting elements, a first reflective element, and a second reflective element. The light-emitting elements are arranged on the circuit board. The first reflective element is disposed on the circuit board. The second reflective element is disposed on the first reflective element and comprises a plurality of apertures. The plurality of light-emitting elements are disposed in the plurality of apertures.

What is claimed is: 
     
         1 . A light-emitting device, comprising:
 a circuit board;   a plurality of light-emitting elements arranged on the circuit board;   a first reflective element disposed on the circuit board; and   a second reflective element disposed on the first reflective element and comprising a plurality of apertures,   wherein the plurality of light-emitting elements are disposed in the plurality of apertures.   
     
     
         2 . The light-emitting device as claimed in  claim 1 , wherein a part of the first reflective element is overlapped with one of the plurality of apertures along a normal direction of the circuit board. 
     
     
         3 . The light-emitting device as claimed in  claim 1 , wherein the first reflective element is overlapped with one of the plurality of light-emitting elements along a normal direction of the circuit board. 
     
     
         4 . The light-emitting device as claimed in  claim 1 , wherein the second reflective element surrounds at least one of the plurality of light-emitting elements. 
     
     
         5 . The light-emitting device as claimed in  claim 1 , wherein a shape of the second reflective element is a grid shape. 
     
     
         6 . The light-emitting device as claimed in  claim 1 , wherein the first reflective element has a first reflectivity R 1 , the second reflective element has a second reflectivity R 2 , and the first reflectivity R 1  is greater than the second reflectivity R 2 . 
     
     
         7 . The light-emitting device as claimed in  claim 1 , wherein the first reflective element has a first reflectivity R 1 , the second reflective element has a second reflectivity R 2 , and the first reflectivity R 1  and the second reflectivity R 2  satisfy the following formula: 
       
         
           
             
               0 
               ≦ 
               
                 
                   
                     ❘ 
                     "\[LeftBracketingBar]" 
                   
                   
                     ( 
                     
                       
                         R 
                         ⁢ 
                         1 
                       
                       - 
                       
                         R 
                         ⁢ 
                         2 
                       
                     
                     ) 
                   
                   
                     ❘ 
                     "\[RightBracketingBar]" 
                   
                 
                 
                   Max 
                   ⁡ 
                   ( 
                   
                     
                       R 
                       ⁢ 
                       1 
                     
                     , 
                     
                       R 
                       ⁢ 
                       2 
                     
                   
                   ) 
                 
               
               < 
               
                 20 
                 ⁢ 
                 
                   % 
                   . 
                 
               
             
           
         
       
     
     
         8 . The light-emitting device as claimed in  claim 1 , wherein the first reflective element comprises a first white material, and the second reflective element comprises a second white material. 
     
     
         9 . The light-emitting device as claimed in  claim 1 , further comprising a light guide plate disposed on the circuit board. 
     
     
         10 . The light-emitting device as claimed in  claim 1 , wherein the circuit board comprises a first part and a second part connected with the first part, the first part extends along a first direction, the second part extends along a second direction, and the first direction is different from the second direction. 
     
     
         11 . The light-emitting device as claimed in  claim 10 , wherein the plurality of light-emitting elements are disposed on the first part. 
     
     
         12 . The light-emitting device as claimed in  claim 10 , wherein a portion of the second part is a connector. 
     
     
         13 . The light-emitting device as claimed in  claim 12 , wherein a plurality of external signals transmit to the plurality of light-emitting elements through the connector.