OPTICAL SHEET, BACKLIGHT, AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

Cylindrical lens bodies are arrayed on one main surface of an optical sheet, and the lenses each have one finite focal length on the exit side of illumination light and have a left-right symmetrical hyperboloid or a paraboloid. The cross-sectional shape of each cylindrical lens body satisfies Z = X2/(R + root(R2 - (1 + K)X2)) with the Z-axis in parallel with the direction normal to the optical sheet and the X-axis in the direction of the array of the cylindrical lens bodies, where R is the curvature radius of the vertex of the body and K is the conic constant.