Abstract
This study is to develop a micromachining technology for a light guidepanel(LGP) mold, whereby micro dot patterns are formed on a LGP surface by a singleinjection process instead of existing screen printing processes. The micro powder blastingtechnique is applied to form micro dot patterns on the LGP mold surface. The optimalconditions for masking, laminating, exposure, and developing processes to form the microdot patterns are first experimentally investigated. A LGP mold with masked micro patternsis then machined using the micro powder blasting method and the machinability of themicro dot patterns is verified. A prototype LGP is test- injected using the developed LGPmold and a shape analysis of the patterns and performance testing of the injected LGP arecarried out. As an additional approach, matte finishing, a special surface treatment method,is applied to the mold surface to improve the light diffusion characteristics, uniformity andbrightness of the LGP. The results of this study show that the applied powder blastingmethod can be successfully used to manufacture LGPs with micro patterns by just singleinjection using the developed mold and thereby replace existing screen printing methods.
Highlights
The light guide panel(LGP) is a key component of the backlight unit(BLU) which transforms the linear light source of a cold cathode fluorescent lamp(CCFL) to uniform planar light source
The purpose of this study is to develop precision mold machining technologies required for LGP injection mold manufacturing processes that circumvent the need for screen printing
In order to improve uniformity and brightness of the light emitted from LGP, matte treatment, a special surface treatment method, is applied and the results are investigated
Summary
The light guide panel(LGP) is a key component of the backlight unit(BLU) which transforms the linear light source of a cold cathode fluorescent lamp(CCFL) to uniform planar light source For this optical transformation, screen printing methods are generally used to form micro patterns on one surface of the injected panel. The micro patterns are composed of several tens of thousands circular or rectangular dots having a maximum diameter or width of 150-180μm and height of roughly 10μm This screen printing process, which should be directly applied to each injected LGP for micro dot formation, causes low productivity and low reproducibility in TFT-LCD manufacturing. The purpose of this study is to develop precision mold machining technologies required for LGP injection mold manufacturing processes that circumvent the need for screen printing To this end, micro powder blasting process[1-9] is applied to fabricate micro dot-patterned injection mold. In order to improve uniformity and brightness of the light emitted from LGP, matte treatment, a special surface treatment method, is applied and the results are investigated
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