Abstract: A light diffraction plate includes a light transmissive layer, and at least one light diffraction layer which is formed on the light transmissive layer, and which has a plurality of light diffraction units. The light diffraction units are formed as protrusions or indentations, and are formed by hot pressing or embossing and curing.

Abstract: A backlight module includes a diffuser, a light guide plate, a reflection sheet, and a light source. The light guide plate includes a top face facing the diffuser, a bottom face opposite to the top face, a light entrance face interconnecting the top and bottom faces and adjacent to the light source, a plurality prismatic strips formed on the top face and extending substantially parallel to each other in a first direction transverse to the light entrance face, and a plurality of spaced apart light deflection protrusions which are arranged in rows along the first direction and each of which tapers outward from the bottom face. The reflection sheet includes a plurality of prismatic strips facing the bottom face of the light guide plate and extending substantially parallel to each other in a second direction transverse to the first direction.

Abstract: A method of making a mold for a light guide plate includes the steps of plating a soft metal layer on a roller, polishing the soft metal layer, engraving the soft metal layer to form a transferring pattern on the soft metal layer, and plating a hard metal layer on the soft metal layer.