Backlight module with light guide plate having concave light input surface

Abstract

A backlight module ( 3 ) includes a light source group ( 31 ) and a light guide plate ( 32 ). The light source group includes at least a light sources (not labeled), the light guide plate has a light input surface ( 321 ) for receiving light and a light output surface ( 322 ) for emitting light. The light source group faces the light input surface, which is a curved and its curvature matches with the light distribution of the light source group.

1 . A backlight module, comprising: 
 a light source; and    a light guide plate having a light input surface for receiving light and a light output surface for emitting light;    wherein the light source faces the light input surface; and    the light input surface is concave, and has a curvature matching a distribution of light of the light source group.    
     
     
         2 . The backlight module as claimed in  claim 1 , wherein the light guide plate is generally parallelepiped-shaped.  
     
     
         3 . The backlight module as claimed in  claim 1 , wherein the light guide plate is generally wedge-shaped.  
     
     
         4 . The backlight module as claimed in  claim 1 , wherein the light source is a group of point light sources.  
     
     
         5 . The backlight module as claimed in  claim 1 , wherein the light source is a linear light source.  
     
     
         6 . The backlight module as claimed in  claim 1 , wherein the light input surface is spherically concave.  
     
     
         7 . The backlight module as claimed in  claim 1 , wherein the light input surface is a cylindrically concave.  
     
     
         8 . The backlight module as claimed in  claim 1 , wherein the light input surface is disposed opposite the light output surface.  
     
     
         9 . The backlight module as claimed in  claim 8 , further comprising a diffusing plate and a brightness enhancing film, the diffusing plate being disposed on the light guide plate, and the brightness enhancing film being disposed on the diffusing plate.  
     
     
         10 . The backlight module as claimed in  claim 9 , wherein the brightness enhancing film is substituted by a prism plate.  
     
     
         11 . The backlight module as claimed in  claim 1 , wherein the light input surface adjoins the light output surface.  
     
     
         12 . The backlight module as claimed in  claim 11 , further comprising a diffusing plate and a brightness enhancing film, the diffusing plate being disposed on the light guide plate, and the brightness enhancing film being disposed on the diffusing plate.  
     
     
         13 . The backlight module as claimed in  claim 12 , further comprising a reflecting plate disposed under the light guide plate.  
     
     
         14 . The backlight module as claimed in  claim 13 , wherein the brightness enhancing film is substituted by a prism plate.  
     
     
         15 . A light module comprising: 
 a light guide plate defining a light input surface for receiving light, said light input surface essentially extending in a direction longitudinally; and    a light source including a plurality of spaced light sub-sources generally arranged along said direction; wherein 
 at least one of said light input surface and a dispersion manner of said plurality of spaced light sub-sources is configured to be in a form of concave to conform with the other so as to form no dark zones in the light guide plate.  
   
     
     
         16 . The light module as claimed in  claim 15 , wherein said light input surface is configured to be in a form of concave.