Light guide plate and liquid crystal display device having the same

A liquid crystal display device comprising:

• a liquid crystal display panel;
• a light guide plate, disposed at a rear side of the liquid crystal display panel, having an exiting surface facing the liquid crystal display panel and a reflecting surface opposite the exiting surface;
• and
• a light source unit disposed along at least one side of the light guide plate,
• the reflecting surface comprising a first region formed with a plurality of first-region grooves of a first length and a second region formed with a plurality of second-region grooves of a second length shorter than the first length,
• wherein the second region comprises a pair of first sub regions, extended along an edge side of the reflecting surface facing the light source unit, and a pair of second sub regions extended along a direction perpendicular to the light source unit, and
• the second-region grooves that are located in the second sub region are shorter than the second-region grooves that are located in the first sub region.

A liquid crystal display device comprising:

• a liquid crystal display panel;
• a light guide plate, disposed at a rear side of the liquid crystal display panel, having an exiting surface facing the liquid crystal display panel and a reflecting surface opposite the exiting surface;
• and
• a pair of light source units disposed with the light guide plate therebetween,
• the reflecting surface comprising a first region comprising a plurality of first-region grooves and a second region comprising a plurality of second-region grooves, the second region surrounding the first region, wherein the second-region grooves have a groove density higher than the first-region grooves, wherein a longitudinal axis of the first region and a longitudinal axis of the second region are parallel to or perpendicular to the at least one side of the light guide plate.

A liquid crystal display device comprising:

• a liquid crystal display panel;
• a light guide plate, disposed at a rear side of the liquid crystal display panel, having an exiting surface facing the liquid crystal display panel and a reflecting surface opposite the exiting surface;
• and
• a pair of light source units disposed with the light guide plate therebetween,
• the reflecting surface comprising a first region comprising a plurality of first-region grooves and a second region comprising a plurality of second-region grooves, the second region surrounding the first region, wherein the second-region grooves have a groove density higher than the first-region grooves,
• wherein the second region comprises a pair of first sub regions, extended along the edge side of the reflecting surface facing the light source unit, and a pair of second sub regions disposed in the sides of the first region and extending perpendicular to each of the pair of light source units, and
• a groove density of the first-region grooves located in the second sub region is higher than a groove density of the first-region grooves located in the first sub region.

A light guide plate having a reflecting surface formed with a plurality of grooves, the reflecting surface comprising:

• a first region, and
• a second region having a groove density that is higher than a groove density of the first region, the second region surrounding the first region, wherein the light guide plate has a rectangular plate shape,
• the second region comprises a pair of first sub regions extended along a first pair of parallel sides of the reflecting surface and a pair of second sub regions extended along a second pair of parallel sides of the reflecting surface, the first pair of parallel sides being perpendicular to the second pair of parallel sides, and
• a groove density in the second sub region is higher than a groove density in the first region.