Automatic inspection apparatus for stain in the polarizing plate using color difference analysis

摘要

PURPOSE: A method for automatically inspecting a smudge on a polarizing plate by using a color difference analysis is provided to enhance a quality managing ability, to reduce manufacturing time, and to improve producing efficiency. CONSTITUTION: A method for automatically inspecting a smudge on a polarizing plate by using a color difference analysis comprises an inspection unit(40), a light source unit(10), a photographing unit(50), and an computing unit(60). The inspection unit comprises one or more reference polarizing plates(20) and an inspection polarizing plate or polarization device(30). The inspection polarizing plate is mounted on one or more reference polarizing plates. The light source unit is arranged on a surface of the inspection unit and irradiates lights on the inspection unit. The photographing unit is arranged on the other surface of the inspection unit and photographs the inspection polarizing plate or polarization device and transmits images thereof to the computation unit. The computation unit analyzes color differences of the transmitted images of the inspection polarizing plate or polarization device per each inspection region, thereby detecting the minute smudge and quantifying the same as a numeric data.