Devitrification of Bismuth Oxide Seal Frit for Back-Light Unit Lamp in LCD

Abstract

To replace the current PbO system of seal frits in the liquid crystal display (LCD) back-light unit (BLU), we examined the thermal behavior of lead-free frit, Bi₂O₃ glasses. Frits consisting of a major composition of Bi₂O₃, ZnO and B₂O₃ were heat-treated and analyzed under different frit sizes using thermal analysis. The variation in frit size affected the crystallization mechanism of the frits during firing. Our findings suggest that devitrification of bismate glass frits is closely related to heating profile and frit size.

Keywords:

• bismate glass
• crystallization
• liquid crystal display-back light unit
• sealing

Acknowledgments

This work is financially supported by the Ministry of Education and Human Resources Development (MOE), the Ministry of Commerce, Industry and Energy (MOCIE) and the Ministry of Labor (MOLAB) through the fostering project of the Lab of Excellency.