A memory device array with spaced apart parallel isolation regions formed in a semiconductor substrate, with an active region between each pair of adjacent isolation regions. The TFT includes a substrate having a pixel region and a non-pixel region, a semiconductor layer, a gate insulating layer, a gate electrode, and source and drain electrodes disposed on the pixel region, at least one gettering site disposed on the non-pixel region, and at least one connection portion to connect the at least one gettering site and the semiconductor layer. The device includes a source layer selectively provided on a surface of the base layer. The access code defines an access point of a communication system. The air gap inside the folded rim extends generally parallel to the faying surfaces. When fluorescence image mode is selected, excitation light in a part of the wavelength band of the blue wavelength band is supplied to an electronic endoscope, and the excitation light which is reflected by the subject is shielded by an excitation light shielding filter situated in front of a CCD, whereby a fluorescence image can be obtained.