Patent ID: 7323123

Claim:
A method of fabricating a light-guide plate, comprising steps of: preparing an upper mold frame having an inclined inner surface and a lower mold frame having a space therein; preparing a micro pattern plate having a surface including one of a plurality of grooves and a plurality of protrusions formed using photolithographic processes; inserting the micro pattern plate into the space of the lower mold frame, the surface of the micro pattern plate facing the inclined inner surface of the upper mold frame; positioning the upper and lower mold frames together; and injecting light-guide plate forming material into a space between the upper and lower mold frames, wherein the step of preparing the micro pattern plate includes: preparing a plate for a micro pattern; depositing an organic insulating layer on the plate; applying a photoresist onto the organic insulating layer; aligning a mask on the photoresist, the mask having a trapezoidal cross section in which two sides are of equal length and a side facing the PR is shorter than an opposite side; exposing portions of the photoresist to ultra violet light; developing the exposed portions of the photoresist to provide a plurality of remaining portions of the photoresist; forming a plurality of triangular protrusions on the plate by anisotropically etching the organic insulating layer using the remaining portions of the photoresist; and plating the plate and the triangular protrusions with copper.