| 摘要 |
PURPOSE: A blacklight device, used for the light source of liquid crystal display, is provided to increase the brightness of light and the productivity of blacklight device. CONSTITUTION: The upper part of a light guide plate, digger in the shape of a quadrangular pyramid, comprises prism patterns formed with 4 triangular faces, so a multiplicity of rectangles, made of 4 triangles, are aligned when viewed from up to down. Accordingly, the center(134) of the rectangle becomes the lowest portion and each side(135) becomes the highest portion. A first face(132) of the prism pattern refracts the light from the direction of x axis and condenses in the direction of z axis. A second face(133) condenses the light from the direction of y axis in the direction of z axis. |
