Browsing by Author "Lee, M. K."

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A novel AOI system for OLED panel inspection
(2005)
Perng, D. B.
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Chen, Y. C.
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Lee, M. K.
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工業工程與管理學系
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Department of Industrial Engineering and Management
Organic light emitting diode (OLED) technology uses substances that emit red, green, blue or white light. An OLED panel consists of stacks of several thin layers of different materials, as such it is not easy to inspect the common OLED defects. In this paper, an auto-optical inspection (AOI) system which can detect such defects effectively and robustly was proposed and developed. The proposed system can also identify, in which layer the defect occurred. Meanwhile, a moving mechanism coupled with a lighting mechanism was proposed and implemented for gabbing clear images. The proposed AOI system would provide great help in improving the OLED production process and the quality control process.
Multilayered optical bit storage in Sm(DBM)(3)Phen-doped poly(methyl methacrylate) read out by fluorescence and reflection modes
(2010-12-08)
Nie, Z. G.
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Lim, K. S.
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Jang, W. Y.
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Lee, H. Y.
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Lee, M. K.
We report on multilayer optical data storage using Sm(DBM)(3)Phen-doped poly(methyl methacrylate) and a tightly focused 800 nm, 1 kHz, 100 fs pulsed laser. After pulsed femtosecond laser irradiation, refractive-index change and a visible fluorescent bit were formed at the irradiated position inside the bulk sample. The photoluminescence should result from the ligands peeled from the central Sm(3+) ions via bond scission induced by laser irradiation. Multilayer patterns recorded by tightly focusing the pulsed laser beam were read out by a reflection-type fluorescence confocal microscope, which can detect the scattered signal and also the fluorescent signal of the stored bits. The dependence of fluorescence and scattering signals on recording pulse energy was examined. The signal-to-noise ratios via two retrieval modes were compared as a function of recording depth. The detection of the fluorescence signal enables retrieval of the stored bits with a higher S/N ratio.
Multilayered optical storage in Sm(DBM)(3)Phen-doped and un-doped polymethylmethacrylate by a femtosecond laser
(2011)
Nie, Z. G.
;
Jang, W. Y.
;
Lim, K. S.
;
Lee, M. K.
;
Lee, H. Y.
We report on multilayered optical storage in Sm(DBM)(3)Phen-doped and un-doped polymethylmethacrylate read out by fluorescence and reflection modes. The detection of fluorescence signal enables retrieval of the stored bits with a higher signal-to-noise ratio. (C) 2011 Optical Society of America