A planar array antenna comprises a powered antenna element and an adjacent passive element which are microstrip-line type ones and disposed on one principal surface of a dielectric substrate; and a feeding system for feeding high frequency power to the powered antenna element. The compound is a compound represented by the following formula :wherein each symbol is as defined in the present specification, or a salt thereof. The nip member may be disposed so as to be in sliding contact with the inner surface of the fusing film and heated by the heater. The order of appearance of the display periods is changed between pixels driven by the odd number gate signal lines and pixels driven by the even number gate signal lines. The degree of a bend along the longitudinal axis of the conduit is measured by the bend angle indicator or by realignment of the angle indicator.