PDP with excellent display quality, including a dielectric layer that does not contain lead, satisfies transmittance, insulation resistance and dielectric constant, and suppresses coloring. The external pane and the internal pane provide a cavity between them, and the light transmission control layer and the shock-absorbing layer are positioned in the cavity. The skeleton and the outer surface are made of the same andor different injection molded materials andor of composite materials. The architecture also enhances the pitch of the analog-to-digital converters, which allows high performance, high resolution analog-to-digital converters to be used. The invention further provides a method that employs the composition in the polishing of a feature or layer, such as a metal film, on a substrate surface. A control method of a laundry machine comprising a spinning cycle includes a sensing step configured to sense a rotation speed of a motor while increasing a pulse duty of the motor during the spinning cycle and a determining step configured to determine bubble generation inside a tub based on the sensed pulse duty and rotation speed.