Backlight module and liquid crystal display

Abstract

Disclosed is a backlight module having light sources and a light guide plate, and the light guide plate has an incident side, and the lights emitted by the light sources pass through the incident side and enter into the light guide plate, and the a light direction changing layer is positioned at the incident side, and the light direction changing layer is employed for changing progress directions of the lights entering the incident side to shorten a distance perpendicular to the incident side from an intersection point of the lights emitted by adjacent light sources to the light sources. The present invention also discloses a liquid crystal display.

What is claimed is: 
     
         1 . A backlight module, comprising light sources and a light guide plate, the light guide plate having an incident side, and the lights emitted by the light sources passing through the incident side and entering into the light guide plate, characterized in that:
 a distance between the light source and a light direction changing layer is a light coulping distance, and the light coulping distance is a predetermined distance for all the lights emitted by the light sources to enter into the light direction changing layer;   a light direction changing layer is positioned at the incident side and is laminated to the incident side of the light guide plate, the light direction changing layer is coated on the incident side of the light guide plate and the light direction changing layer is employed for changing progress directions of the lights entering the incident side to shorten a distance perpendicular to the incident side from an intersection point of the lights emitted by adjacent light sources to the light sources;   wherein a distance between the light sources and the light direction changing layer is a light coupling distance, all the lights emitted by the light sources can enter the light direction changing layer.   
     
     
         2 . The backlight module according to  claim 1 , characterized in that the light guide plate has a first refractive index, and the lights emitted by the light sources pass through a medium and enter into the light guide plate, and the medium has a third refractive index, characterized in that:
 the light direction changing layer has a second refractive index, and the second refractive index is smaller than the first refractive index and larger than the third refractive index.   
     
     
         3 . A liquid crystal display, characterized in that, the liquid crystal display comprises a backlight module having light sources and a light guide plate, and the light guide plate has an incident side, and the lights emitted by the light sources pass through the incident side and enter into the light guide plate;
 a light direction changing layer is positioned at the incident side and is laminated to the incident side of the light guide plate, and the light direction changing layer is employed for changing progress directions of the lights entering the incident side to shorten a distance perpendicular to the incident side from an intersection point of the lights emitted by adjacent light sources to the light sources;   wherein the light guide plate has a first refractive index, and the lights emitted by the light sources pass through a medium and enter into the light guide plate, and the medium has a third refractive index, the light direction changing layer has a second refractive index, and the second refractive index is smaller than the first refractive index and larger than the third refractive index.   
     
     
         4 . The liquid crystal display according to  claim 3 , characterized in that a distance between the light source and the light direction changing layer is a light coulping distance, and the light coulping distance is a predetermined distance for all the lights emitted by the light sources to enter into the light direction changing layer. 
     
     
         5 . The liquid crystal display according to  claim 4 , characterized in that the light direction changing layer is a transparent film, and material of the transparent film is silicon dioxide or calcium fluoride. 
     
     
         6 . The liquid crystal display according to one of  claim 5 , characterized in that the transparent film is coated on the incident side of the light guide plate.