Optical unit and LCD device using the optical unit

Abstract

An optical unit includes a light conductive plate having a first surface and a second surface, at least one optical sheet on the first surface of the light conductive plate, and a light reflective sheet extending over an entire second surface of the light conductive plate and fastened on a portion of a first surface of the optical sheet adjacent a periphery thereof to fasten the light conductive plate, the optical sheet, and the light reflective sheet as an optical unit, and to define a light discharge region on the first surface of the optical sheet and the first surface of the light conductive plate.

1 . An optical unit, comprising:
 a light conductive plate having a first surface and a second surface;   at least one optical sheet on the first surface of the light conductive plate; and   a light reflective sheet extending over an entire second surface of the light conductive plate and fastened on a portion of a first surface of the optical sheet adjacent a periphery thereof to fasten the light conductive plate, the optical sheet, and the light reflective sheet as an optical unit, and to define a light discharge region on the first surface of the optical sheet and the first surface of the light conductive plate.   
     
     
         2 . A liquid crystal display device, comprising:
 a pair of substrates;   a liquid crystal interposed between the pair of substrates; and   an optical unit as claimed in  claim 1  arranged on one side of one of the pair of substrates.   
     
     
         3 . A liquid crystal display device incorporating the optical unit as claimed in  claim 1 . 
     
     
         4 . An optical unit for a liquid crystal display device, comprising:
 a light conductive plate;   a source of light arranged to impinge light to an edge of the light conductive plate; and   a single light reflective sheet retaining the light conductive plate, the source of light, and the single light reflective sheet fastened in an appropriate positional relationship.   
     
     
         5 . The optical unit as claimed in  claim 1 , wherein the optical sheet comprises a diffusion sheet. 
     
     
         6 . The optical unit as claimed in  claim 1 , wherein the optical sheet comprises a lens sheet. 
     
     
         7 . The optical unit as claimed in  claim 1 , further comprising:
 a source of light arranged to impinge light onto an edge of the light conductive plate.   
     
     
         8 . A liquid crystal display device comprising:
 a pair of substrates;   a liquid crystal interposed between the pair of substrates; and   an optical unit as claimed in  claim 1  arranged on one side of one of the pair of substrates.