PDP 무연 투명유전체 후막의 형성 및 특성

Abstract

Dry film method for large size of PDP(Plasma Display Panel) module has been actively investigated. This method for lead-free transparent dielectric formation depends on green sheet technology. By adjusting the composition of transparent dielectric powders and organics, uniformly dispersed slurry was fabricated. Viscosity of the slurry exhibited pseudoplastic behavior for tape casting. Cast green sheets were tested under tensile condition at room temperature. It was found that the increase in transparent dielectric powder and binder ratio leads to decrease in strain to failure of green sheets from 120 % to 34 % and from 255 % to 4 %, respectively. Tensile strength of green sheets decreased abruptly with increase of transparent dielectric powder ratio, with minimum at 0.13 ㎫. On the other hand, tensile strength increased continuously from 0.1 ㎫ to 2.4 ㎫ with increase of binder ratio. The green sheets were attached on the glass substrate and heated by following firing schedule. As a result, the best result was obtained when fired at 580 ℃ for 15 min and had transmittance of 78 % in visible range 550 ㎚.