Light guide bar and backlight device with the same

Abstract

A light guide bar for improving external characteristics by inducing light projection through side surfaces. The light guide bar comprises: a main body in the shape of a bar having a predetermined length; a light incident surface to which light is incident from one side end portion in the lengthwise direction of the main body; a reflection surface for reflecting the incident light from the light incident surface to the inside of the main body; a projection surface for projecting the incident light from the light incident surface to the outside of the main body; and a light extraction pattern formed on the projection surface. The light guide bar, as configured above, induces the projection of light through the light projection surfaces at both side surfaces such that a dark area between the light guide bars can be removed in a backlight device so as to improve external characteristics.

What is claimed is: 
     
         1 . A backlight device comprising:
 a cover bottom;   a plurality of light guide bars disposed in the cover bottom, each comprising a light guide main body having a bar shape with a certain length, a light incident surface into which light enters from at least one end of the light guide main body in a longitudinal direction, a reflection surface configured to reflect light entering from the light incident surface into the light guide main body, a light emission surface configured to emit the light entering from the light incident surface to the outside of the light guide main body, and a light extraction pattern formed at the light emission surface;   a light source disposed at the light incident surface of the light guide bar to cause light to enter the light guide bar; and   a light control member disposed over the light guide bar.   
     
     
         2 . The backlight device according to  claim 1 , wherein the light guide main bodies are formed in a separation type in which a central section is separated, and are disposed in a zigzag on the same line in a longitudinal direction. 
     
     
         3 . The backlight device according to  claim 1 , wherein the light guide bar comprises hooking wings protruding from an end of the light incident surface of the light guide main body toward both sides, an end of the light incident surface side is fixed to the cover bottom by a fixing means configured to press the hooking wing, and an end of a pupillary light surface side is assembled to be thermally expanded. 
     
     
         4 . The backlight device according to  claim 3 , wherein the fixing means is constituted by a mold frame including a hooking piece corresponding to the hooking wing of the light guide bar and being fastened to the cover bottom, or constituted by a hooking protrusion protruding from a bottom surface of the cover bottom at a position corresponding to the hooking wing of the light guide bar. 
     
     
         5 . The backlight device according to  claim 1 , further comprising a fixing grip configured to press both side surfaces of the light guide main body to fix the light guide main body to the cover bottom.