Improvement on Fat Edge Defects of Polyimide Coating Film in LCD Alignment Process
|關鍵字:||聚醯亞胺;配向膜製程;肥邊;突沸現象;Polyimide;Fat edge;alignment process;bumping hole|
|摘要:||本研究的目的為改善Cell製程TFT側與CF側配向膜coating配向Polyimide(PI)膜塗佈，再經由預烤爐(hot plate)pre-bake後在印刷邊緣不均勻區域收縮範圍與段差所產生之肥邊(fat edge)瑕疵改善研究，以改善顯示器可視區域邊緣與角落視覺異常。
The purpose of this research is for the improvement of fat edge defects of Polyimide (PI) membrane after pre-bake heating in the LCD alignment process. The objective is to study the heating procedure to reduce the PI membrane edge non-uniform region and the sectional difference, which are the key issues of the active area and the corner visual abnormality. Two heating modes (heating plate made contact or non-contact with PI membrane) in pre-baking process are discussed in this thesis. In the contact mode with 70ºC 10 second heating period, the experimental results showed that the "temperature increasing curve" and "un-uniform region reducing" are better than in non-contact mode. This can solve the active area issue. Besides the two heating modes operation, the heat flux between glass substrate and pre-baking furnace is also discussed. After final baking process, the alignment film is analyzed by several instruments such as optical microscope, pre-tilt angle confirmation, focus ion beam analyzer, and Fourier transformation infrared rays analyzer. The results showed that the alignment film corresponded with engineering specifications. The experiment also discovered that heating the polyimide by way of instantaneous elevates temperature increment will have the broken bumping hole on the film. This research can be a strategy for reducing defect during alignment film production, decreasing the energy needs, and saving cost to enhance the competitiveness of a company in the TFT-LCD industry.
|Appears in Collections:||Thesis|
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