In a display device using a demultiplexer, two power cables for transmitting external power supply voltages to a display device are formed on the top and the bottom of a substrate, and are coupled to both ends of vertical lines for transmitting power supply voltages to pixels in the display area. The meandering parts 13a and 13b include a plurality of sides arranged in a longitudinal direction where the meandering parts 13a and 13b extend. An optical waveguide comprising such a curved optical waveguide and an optical waveguide having a different core shape optically connected with the former, and an optical device using such a curved optical waveguide. The present invention also provides diagnostic agents useful for detecting telomerase protein andor nucleic acid molecules. Step decides to move the synchronization starting point, and uses the I and Q odd samples for subsequent despreading of the I and Q signals. The tool can be attached to the sheath at one or more lengths along the tool.