면광원용 저온 소성형 형광체 paste 특성 연구

Abstract

BLU is a important part of the most representative LCD at flat panel display. In order to supplement the optical special quality which LCD cannot light itself, BLU is an essential property to supply with same brightness on the screen. The backlight takes the most importance of the panel's price. In addition, it consumes almost 90% of the power consumption at LCD panel. For the improvement of LCD's low power consumption, high-definition, and price competitiveness, the innovation of the backlight skill is the one of the most important issues. Therefore, I tried to manufacture the Flat light source BLU which utilizes the Field emission principles instead of CCFL lamp. A phosphor paste used in Flat light source BLU the forms phosphor layer as doing the screen printing. Also, through the process which calls firing, the binder existed in paste are excluded. If the binder still existed after firing, the luminance and life of the a phosphor should be reduced. The binder resin used in phosphor paste is a Ethyl cellulose type. Thus, in order to do thermal decomposition completely, the 470℃ is needed. However, mixing a phosphor outbreaks a degradation when the temperature reaches 420℃. In addition, if the temperature reaches to the 470℃, the luminance should be reduced about 30%. Therefore, the method for the protection of phosphor degradation is that we apply the paste which does firing completely in low temperature. As a result, if the binder resin in phosphor paste fired completely in low temperature, we can earn the improvement of the luminance and also manifest the phosphor peculiar light itself with 100%. As manufacturing the low temperature firing paste applicable Flat light source for LCD BLU, this study examined the specific quality. For the phosphor pastes, the low temperature firing acryl resin is used as the binder resin. As the result of thermal decomposition characteristics, residual hydroxylcarbon rested under 0.1wt% on 400℃. With the manufactured paste in this study, the Flat light source device is manufactured through the screen printing and it brought the almost 100% of luminous efficiency about the phosphor luminance.