Backlight assembly and liquid crystal display device using the same

Abstract

Disclosed are a backlight assembly and a liquid crystal display device using the same. A ratio of a pitch, which is an interval between the lamps for supplying light to an LCD panel, to a gap, which is a distance between the center of the lamps and an optical plate, is adjusted to thereby minimize the bright line that badly influences the image display quality, so as to display a high quality image.

1 . A backlight assembly comprising: 
 a receiving container;    at least two lamps disposed in the receiving container; and    an optical plate for enhancing brightness uniformity of light generated from the lamps,    wherein the backlight assembly has a bright line prevention ratio of a pitch to a gap, the pitch being a distance between centers of two adjacent lamps and the gap being a distance between a center of the respective lamps and a surface of the optical plate.    
   
   
       2 . The backlight assembly of  claim 1 , wherein the bright line prevention ratio is in the rage from about 1.3 to about 2.0 to prevent a bright line generated from the lamps from being perceived outside the optical plate.  
   
   
       3 . The backlight assembly of  claim 2 , wherein the bright line prevention ratio is in the range from about 1.7 to about 1.8.  
   
   
       4 . The backlight assembly of  claim 1 , wherein the optical plate has a transmissivity in the range from about 35% to about 65%.  
   
   
       5 . The backlight assembly of  claim 1 , further comprising an optical sheet formed at an outer surface of the optical plate so as to further enhance the brightness uniformity.  
   
   
       6 . The backlight assembly of  claim 5 , further comprising a brightness-enhanced film formed at the outer surface so as to reproduce light diffused by the optical sheet to increase usage efficiency of the light.  
   
   
       7 . A backlight assembly comprising: 
 a receiving container;    at least two lamps disposed in the receiving container;    a diffusion plate for diffusing light generated from the lamps; and    a diffusion pattern formed at a portion of the diffusion plate, the portion being opposite to the lamps,    wherein the backlight assembly has a bright line prevention ratio of a pitch to a gap, the ratio being in the range from about 1.3 to about 2.8 to prevent a bright line generated from the lamp from being perceived outside the diffusion plate, the pitch being a distance between centers of two adjacent lamps and the gap being a distance between a center of the respective lamps and a surface of the diffusion plate.    
   
   
       8 . The backlight assembly of  claim 7 , wherein the diffusion plate has a transmissivity in the range from about 35% to about 65%.  
   
   
       9 . The backlight assembly of  claim 7 , further comprising a diffusion sheet formed at an outer surface of the diffusion plate so as to further enhance the brightness of the light.  
   
   
       10 . The backlight assembly of  claim 9 , further comprising a brightness-enhanced film formed at the outer surface so as to reproduce light diffused by the diffusion sheet to increase usage efficiency of the light.  
   
   
       11 . A liquid crystal display device comprising: 
 a backlight assembly including: 
 a receiving container;  
 at least two lamps disposed in the receiving container, for generating a first light; and  
 an optical plate being apart from centers of the lamps, for diffusing the first light to generate a second light having a uniform brightness distribution, wherein the backlight assembly has a bright line prevention ratio of a pitch to a gap, the pitch being a distance between centers of two adjacent lamps and the gap being a distance between a center of the respective lamps and a surface of the optical plate;  
   a liquid crystal display panel assembly received in the receiving container, for displaying images using a second light diffused by the optical plate; and    a chassis for fixing the liquid crystal display panel assembly to the receiving container.    
   
   
       12 . The liquid crystal display device of  claim 11 , wherein the bright line prevention ratio is in the range from about 1.3 to about 2.8 to prevent a bright line of the first light from being perceived outside the optical plate.  
   
   
       13 . The liquid crystal display device of  claim 12 , wherein the bright line prevention ratio is in the range from about 1.7 to about 1.8.  
   
   
       14 . The liquid crystal display device of  claim 11 , further comprising a diffusion pattern for diffusing the first light, the diffusion pattern formed at a portion of the optical plate, the portion being opposite to the lamps.  
   
   
       15 . The liquid crystal display device of  claim 14 , wherein the bright line prevention ratio is in the range from about 2.3 to about 1.7.  
   
   
       16 . The liquid crystal display device of  claim 11 , wherein the optical plate has a transmissivity in the range from about 35% to about 65%.  
   
   
       17 . The liquid crystal display device of  claim 11 , further comprising an optical sheet disposed between the optical plate and the liquid crystal display panel assembly.  
   
   
       18 . The liquid crystal display device of  claim 17 , further comprising a brightness-enhanced film formed on the optical sheet, the brightness-enhanced film reproducing a third light diffused by the optical sheet to increase usage efficiency of the light.  
   
   
       19 . The liquid crystal display device of  claim 11 , wherein the pitch is in the range from about 13 mm to about 23 mm.