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Analysis of Polymer Carbonization using Lasers and its Applications for LCD Manufacturing Process  

Ahn, Dae-Hwan (Department of Mechanical Engineering, POSTECH)
Bak, Byoung-Gu (Department of Mechanical Engineering, POSTECH)
Kim, Dong-Eon (Department of Physics, POSTECH)
Kim, Dong-Sik (Department of Mechanical Engineering, POSTECH)
Publication Information
Journal of the Korean Society for Precision Engineering / v.27, no.6, 2010 , pp. 24-31 More about this Journal
Abstract
Laser carbonization of a polymer layer can be employed in various applications in the microelectronics industry, e.g repairing brightness pixels of an LCD panel. In this work, the process of thermal degradation of LCD color filter polymer by various laser sources with pulsewidths from CW to fs is studied. LCD pixels are irradiated by the lasers and the threshold irradiance of LCD color filter polymer carbonization is experimentally measured. In the numerical analysis, the transient temperature distribution is calculated and the number density of carbonization in the polymer layer is also estimated. It is shown that all the lasers can carbonize the polymer layers if the output power is adjusted to meet the thermal conditions for polymerization and that pulsed lasers can result in more uniform distribution of temperature and carbonization than the CW laser.
Keywords
Carbonization; Laser Processing; Polymer; Pyrolysis; Thermal Degradation;
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1 Kim, Y. I. and Shim, C. S., "Method of repair an Liquid Crystal Cell, method of manufacturing Liquid Crystal Display Device using the same, and Liquid Crystal Display repaired using the same," Korea Patent, No. 10-2005-0085856, 2005.
2 Spozhnikova, T. S. and Mirzoev, A. A., "Ab initio simulation of the electronic structure of poly(vinylidene fluoride) during carbonization," Physics of the Solide State, Vol. 50, No. 6, pp. 1191-1194, 2008.   DOI   ScienceOn
3 Castro-Muniz, A., Martinez-Alonso, A. and Tascon, J. M. D., "Modification of the pyrolysis/carbonization of PPTA polymer by intermediate isothermal treatments," Cabon, Vol. 46, No. 7, pp. 985-993, 2008.
4 Srinivasan, R., "Pulsed ultraviolet laser interactions with organic polymers-dependence of mechanism upon laser power," Polymer Degradation and Stability, Vol. 43, No. 1, pp. 101-107, 1993.
5 Bityurin, N. and Malyshev, A., "Bulk photothermal model for laser ablation of polymers by nanosecond and subpicosecond pulses," J. Applied Physics, Vol. 92, No. 1, pp. 605-613, 2002.   DOI   ScienceOn
6 Arnold, N. and Bityurin, N., "Model for laser-induced thermal degradation and ablation of polymers," Applied Physics A, Vol. 68, No. 6, pp. 615-625, 1999.   DOI   ScienceOn
7 Metayer, P., Davenas, J. and Bureau, J. M., "Ablation and carbon deposition induced by UV laser irradiation of polyimide: Application to the metallization of VIAs in high density printed circuit boards," Nuclear Instruments and Methods in Physics Research B, Vol. 185, No. 1-4, pp. 156-162, 2001.   DOI   ScienceOn
8 Lippert, T. and Dickinson, J. T., "Chemical and spectroscopic aspects of polymer ablation: Special features and novel directions," Chemical Reviews, Vol. 103, No. 2, pp. 453-485, 2003.   DOI   ScienceOn
9 Peled, A., "Photo-excited processes, diagnostics and applications," Kluwer Academic Publishers, pp. 145-152, 2003.
10 Nemeth, P. R., "Photo ablation to resolve "bright on" pixel defects in a normally white LCD," US Patent, No. 2001-770854, 2001.
11 Perng, L. H., "Thermal degradation mechanism of poly(arylene sulfone)s by stepwise Py-GC/MS," J. Polymer Science Part A: Polymer Chemistry, Vol. 38, No. 3, pp. 583-593, 2000.   DOI   ScienceOn
12 Mansour, N. and Jamshidi-Ghaleh, K., "Modeling of pulsed ultraviolet laser-induced ablation of polymers," J. Physics D: Applied Physics, Vol. 38, No. 6, pp. 852-856, 2005.   DOI   ScienceOn
13 Paterson, C., Holmes, A. S. and Smith, R. W., "Excimer laser ablation of microstructures: A numerical model," J. Applied Physics, Vol. 86, No. 11, pp. 6538-6546, 1999.   DOI
14 Dyer, P. E., "Excimer laser polymer ablation: twenty years on," Applied Physics A: Material Science & Processing, Vol. 77, No. 2, pp. 167-173, 2003.