A process for producing an ionic crosslinked fibrous material, such as a cellulosic fabric, paper, or other substrate, wherein the ionic crosslinked fiber exhibits an increased wrinkle resistance angle. The dual mode sample and hold circuit has a charge-redistribution mode and a flip-around mode. Therefore, it is possible to reduce the number of pins of a memory interface by reducing the number of memory device for storing pixel values of image data, required for performing DCC of a LCD, resulting in minimizing a chip size, and to enhance compression efficiency without visual deterioration in images. A branch path extends to the intermediate port. The duct includes a first absorption hole and a main exhaust hole that communicate with an outside, and forms an air-flow path on which the first absorption hole, the power supply unit, the ballast, the lamp, and the main exhaust hole are disposed.