Direct backlight module

Abstract

A direct backlight module has a light guide plate, a plurality of lamp tubes, a reflecting plate and a frame. The light guide plate has a upper surface and a lower surface, and at least one surface of the light guide plate is coated with an ink layer. The lamp tubes are located below the light guide plate. The reflection plate is located below the lamp tubes. The frame covers the reflecting plate, lamp tubes and light guide plate. The ink layer contains a plurality of diffusing granules for diffusing lights to produce uniform lights.

1 . A direct backlight module, comprising: 
 a light guide plate having a upper surface and a lower surface;    at least one ink layer formed on the upper surface of the light guide plate;    a plurality of lamp tubes located below the light guide plate to provide lights into the light guide plate;    a reflecting plate located below the lamp tubes for reflecting lights to the light guide plate; and    a frame for holding the reflecting plate, the lamp tubes, and the light guide plate;    wherein the ink layer has a plurality of diffusion granules for diffusing lights to produce uniform lights.    
   
   
       2 . The direct backlight module of  claim 1 , wherein the light guide plate is made from transparent acrylic.  
   
   
       3 . The direct backlight module of  claim 1 , wherein the ink layer is formed on the upper surface of the light guide plate by a screen-printing process.  
   
   
       4 . The direct backlight module of  claim 1 , wherein the ink layer comprises a white fluorescent paint.  
   
   
       5 . The direct backlight module of  claim 1 , wherein the ink layer comprise a transparent resin for absorbing and retaining lights of the lamp tubes before emitting from the light guide plate.  
   
   
       6 . The direct backlight module of  claim 1  further including a plurality of optical films located above the ink layer.