Abstract
Bubble defects inside liquid crystal displays (LCD) despite being well sealed and without joint failures were generally detected during appearance and inspection checks at customers overseas. However, some of the bubble defects went away when air transportation returned unsatisfactory LCDs from overseas to Thailand, the transportation involving changes in both ambient temperature and pressure. An investigation of the bubble appearance/disappearance under individual and combined variations in temperature and pressure was performed to observe and understand the bubble defect formation. This understanding can lead to improvements in sorting and detection methods of the bubble defects inside LCDs. The results showed that both temperature and pressure are influential factors. At low temperatures and low pressure, bubbles can be detected. However, at high temperatures and high pressure, bubbles can disappear due to the solubility of the gas in the liquid crystal. Therefore, low pressure and low temperature testing can be applied as a suitable condition for the bubble defect detection in quality assessment of LCDs.
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