A touch display device may include an organic light emitting diode display panel that includes scan lines, data lines, and OLED cells, and a driver to display a touch position on a screen in a frame that includes a touch subfield. A backup operation system is set, and based on the setting, a data file under editing or the like is saved in a backup section. Each of a plurality of the antennas is connected to a path of a variable path simulator capable of generating multiple paths between the antennas and external wireless communication test equipment. At each output port, the cells are serialized again by means of a second serializer and then transmitted via a second serial communication link, to the appropriate SCAL. The optical element is so constituted as to optically correct a shift of the master held by the master stage from an ideal state. This system gives a noise reduction of 20 dB in a stereo FM broadcast receiver.