超音波によるフィルム基板液晶セル内の微小気泡の検出に関する研究

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  • The Detection of Micro Bubbles in a Film Substrate Liquid Crystal Cell Using Ultrasonic Technique
  • チョウオンパ ニ ヨル フィルム キバン エキショウ セル ナイ ノ ビショウ キホウ ノ ケンシュツ ニ カンスル ケンキュウ

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A film substrate liquid crystal cell was researched and developed as an advanced display. The display has a lot of advantages, such as light, thin, and not easy to crack. It is manufactured by Roll-to-Roll process. In this manufacturing process, the automatic detecting method of the bubble in the liquid crystal layer is required. When the bubbles are in the liquid crystal layer, the part where the bubble exists cannot be displayed. It is called "missing dots". Therefore, it is very important to detect the bubble in the liquid crystal layer. But, the bubble under the black matrix cannot be detected by an optical method. Its diameter is 10 μm or less.<BR>In this study, a method to detect the bubble of 10 μm or less in diameter using an ultrasonic technique was studied. Owing to the instability of the bubble in the crystal layer, drilled holes and silica balls were used as detection objects instead of bubbles.<BR>As a result, it was indicated that the drilled hole of the size of about 30% of the focus diameter of the ultrasonic probe can be detected. The attenuation coefficient in the film of the ultrasonic wave of frequency 250 MHz was about 4.3. The silica balls of 5.5 μm or 5 μm in diameter was detected using the ultrasonic probe of frequency 250 MHz and of 6 μm in focal diameter. Moreover, the bubble of 10 μm or less in diameter was clearly observed.

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  • 成形加工

    成形加工 24 (7), 424-429, 2012

    一般社団法人 プラスチック成形加工学会

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