Light guide plate with translucent ink film, and backlight module and liquid crystal display device using the same

Abstract

A light guide plate ( 200 ) includes at least one surface through which light beams pass, at least one translucent ink film ( 220 ) disposed on the at least one surface through which light beams pass, and the at least one translucent ink film includes a plurality of pigment particles ( 221 ). The pigment particles of the translucent ink film can absorb red light and green light, and thereby compensate for a shift in chromaticity that would otherwise occur in a backlight module due to absorption of blue light in the optical sheets of the backlight module. Therefore degradation of the display quality of the LCD is reduced or even eliminated.

1 . A light guide plate, comprising: 
 at least one surface through which light beams pass; and    at least one translucent ink film disposed on the at least one surface through which light beams pass;    wherein the at least one translucent ink film comprises a plurality of pigment particles.    
   
   
       2 . The light guide plate as claimed in  claim 1 , wherein pigment particles are blue pigment particles.  
   
   
       3 . The light guide plate as claimed in  claim 1 , wherein a thickness of the at least one translucent ink film is in the range from 1 mm to 100 mm.  
   
   
       4 . The light guide plate as claimed in  claim 1 , further comprising an emitting surface, a bottom surface opposite to the emitting surface, and an incident surface between the emitting surface and a bottom surface, wherein the at least one surface through which light beams pass is selected from the group consisting of the emitting surface and the bottom surface.  
   
   
       5 . The light guide plate as claimed in  claim 4 , wherein the at least one translucent ink film is disposed on the emitting surface.  
   
   
       6 . The light guide plate as claimed in  claim 4 , wherein the at least one translucent ink film is disposed on the bottom surface.  
   
   
       7 . The light guide plate as claimed in  claim 1 , further comprising an emitting surface and an incident surface opposite to the emitting surface, wherein the at least one surface through which light beams pass is selected from the group consisting of the emitting surface and the incident surface.  
   
   
       8 . The light guide plate as claimed in  claim 7 , wherein the at least one translucent ink film is disposed on the incident surface.  
   
   
       9 . The light guide plate as claimed in  claim 2 , wherein the blue pigment particles are blue dye particles.  
   
   
       10 . The light guide plate as claimed in  claim 1 , wherein the pigment particles are spherical, and sizes of the pigment particles are in the range from 1 μm to 100 μm.  
   
   
       11 . A backlight module, comprising: 
 a light guide plate, comprising an incident surface and at least one other surface through which light beams pass, and at least one translucent ink film disposed on at least one of the incident surface and the at least one other surface through which light beams pass, the at least one translucent ink film comprising a plurality of pigment particles; and    a light source disposed adjacent to the incident surface of the light guide plate.    
   
   
       12 . The backlight module as claimed in  claim 11 , wherein the pigment particles are blue pigment particles.  
   
   
       13 . The backlight module as claimed in  claim 11 , wherein a thickness of the translucent ink film is in the range from 1 mm to 100 mm.  
   
   
       14 . The backlight module as claimed in  claim 11 , wherein the light guide plate further comprises an emitting surface and a bottom surface opposite to the emitting surface, wherein the incident surface is between the emitting surface and the bottom surface, and the at least one other surface through which light beams pass is selected from the group consisting of the emitting surface and the bottom surface.  
   
   
       15 . A liquid crystal display device, comprising: 
 a top substrate and a bottom substrate opposite to each other;    a liquid crystal layer sandwiched between the substrates; and    a backlight module disposed adjacent to the bottom substrate, the backlight module comprising: 
 a light guide plate comprising an incident surface and at least one other surface through which light beams pass, and at least one translucent ink film disposed on at least one of the incident surface and the at least one other surface through which light beams pass, the at least one translucent ink film comprising a plurality of pigment particles; and  
 a light source disposed adjacent to the incident surface of the light guide plate.  
   
   
   
       16 . The liquid crystal display device as claimed in  claim 15 , wherein the pigment particles are blue pigment particles.  
   
   
       17 . The liquid crystal display device as claimed in  claim 15  wherein a thickness of the at least one translucent ink film is in the range from 1 mm to 100 mm.