One embodiment is directed to transmitting encoded data over a broadcast medium to improve network throughput. 5% of Li2O, 7 to 20% of Na2O, and 0 to 15% of K2O. The folded cushion member is capable of being withdrawn from a cushion removal opening formed on a side of a seat. A modem unit performs modulationdemodulation processings. The system controller holds an input and output of at least one of either the focus controller or the tracking controller on the basis of the output of the defect detector, and sets an initial value in a delay memory of the digital filter of the controller held upon awake of the hold state. By utilizing the method in the present invention, color loss of a field sequential color display occurred in a lower temperature environment is improved.