2012 Volume 53 Issue 5 Pages 968-972
In this study, glass substrate was re-used from old TFT-LCD, and characteristics of the re-used glass substrate were investigated. For the characterization, ITO layer was separated from the glass substrate by decomposing the color filter layer which is located between ITO layer and glass substrate using color filter stripping solutions. Surface roughness and optical transmittance of the glass substrate after removal of ITO and color filter layer were measured, and they were compared with those of newly produced one. As a result, surface roughness of re-used glass substrate between the two samples was rarely different. As well, difference in optical transmittance between the two samples was rarely different attributed to the surface roughness. Therefore, glass substrate was clearly re-used from old TFT-LCD panel. For more investigation, new ITO layers were coated onto the two glass substrates using ITO ink, respectively. After coating, electrical resistance and optical transmittance was investigated to observe effect of the roughness on the characteristics.