Development of the Injection Mould for Forming the Micro Dot Pattern of the Light Guide Panel of TFT-LCD

초록

The main purpose of this study is to develop micro-machining technologies for LGP (light guide panel) mould, which can form micro-dot patterns on LGP in a single injection process. To make micro-dot patterns on the LGP mould, powder blasting technique is introduced, which is expected to replace existing screen printing process. As preceding processes, optimum masking conditions (laminating, exposure and developing) for circular and square dot, are investigated based on a series of experiments. LGP mould samples with micro-circular and square patterns are machined using introduced powder blasting method, and machinabilities are investigated to determine optimum machining conditions. Then, a prototype of LGP with micro-dot pattern is injected using developed mould, and dimensional analyses of formed micro-patterns are performed. From the results of this study, it can be verified that micro-dot patterns on LGP can be formed in a single injection process using developed mould. Thus, it can be verified that the introduced powder blasting process can be successfully applied to micro-machining of injection mould with micro-dot patterns for LGP.