MANUFACTURING METHOD OF NON-SYMMETRIC MULTI-CURVATURE MICROLENS AND ITS APPLICATION TO LIGHT GUIDE PLATE

摘要

The present invention relates to a method of manufacturing a microlens on a light guide plate, comprising a first step of aligning a mask on a substrate coated with a photoresist, the mask being composed of a first region through which light can be transmitted and a plurality of second regions through which light cannot be transmitted; a second step of performing inclined light exposure at least once such that light is radiated from an upper side to a lower side of the second region at a non-symmetric inclination angle in at least one direction; a third step of developing the substrate subjected to the inclination light exposure and obtaining a plurality of photoresists in the form of non-symmetric truncated cone; a fourth step of performing a reflow process to allow the non-symmetric truncated cone shaped photoresists to be curved such that non- symmetric multi-curvature microlens shaped photoresists are obtained; a fifth step of fabricating an engraved stamper in which the photoresists in the form of the non-symmetric multi-curvature microlens are formed in an engraved fashion; and a sixth step of forming a light guide plate by using the engraved stamper as a mold such that the non-symmetric multi-curvature microlenses are formed on the light guide plate in an embossed fashion. According to the present invention, since the non-symmetric multi-curvature microlens has an improved function of controlling refraction and diffused reflection of light, a desired optical performance can be obtained. Thus, the non-symmetric multi-curvature microlens can be easily applied to a light guide plate or the like by using the non-symmetric multi-curvature microlens array pattern.