In the manufacture of LCDs, cullets (glass shavings) may adhere to the panel surface during polishing of the panel edges. When a polarizing plate is mounted on a panel with cullets, air bubbles may form and the yield rate may deteriorate. To prevent this problem, a polisher and washer are used to form a smooth panel. However, since high pressure cannot be applied to the panel surface during polishing, it is very important to maintain sufficient, uniform pressure between the panel and the polishing sheet.