Liquid crystal display device, light guide plate, and method for producing light guide plate

A liquid crystal display device comprising:

• a liquid crystal cell array;
• a light guide plate disposed on a rear or front side of said liquid crystal cell array and for lighting said liquid crystal cell array from the rear or front side;
• and
• a light source disposed on one side end face of said light guide plate and for radiating light from said one side end face of said light guide plate into said light guide plate,
• wherein a plurality of concave dots are formed in a surface of said light guide plate opposite to a light emitting surface of said light guide plate which emits light to said liquid crystal cell array so that light incident on said light guide plate from said light source is reflected at said concave dots in a direction toward said light emitting surface of said light guide plate, and
• wherein each of said concave dots is shaped like a triangle with a sectional inclination angle of from 50 to 60° in sectional view and shaped like an approximate rectangle or square in plan view in a direction perpendicular to said opposite surface of said light guide plate and disposed so that a long side of said approximate rectangle or a side of said approximate square is approximately parallel with a longitudinal direction of said light source.