Patent ID: 7298434

Claim:
A liquid crystal display device comprising: a liquid crystal display panel; a lamp irradiating light to the liquid crystal display panel; a light guide plate converting the light from the lamp into a surface light to irradiate to the liquid crystal display panel; and a plurality of patterns, each of the patterns being formed in the light guide plate and having a first curvature of a first sectional surface and a second curvature of a second sectional surface which are different from each other, wherein each of the patterns includes: a pillar having a first lateral wall element and a second lateral wall element which have different heights from each other in a direction of the first sectional surface, and a third lateral wall element and a fourth lateral wall element which have same heights with each other in a direction of the second sectional surface; a first curved surface formed between the first and the second lateral wall elements; and a second curved surface formed between the third and the fourth lateral wall elements.