An all-wheel drivetrain for a motor vehicle, which has at least two driven axles, comprising a characteristic torque converter transmission of longitudinal construction. The image pickup apparatus may include a video signal generating device that generates video signals in a first direction and a second direction and a signal processing device that changes one of a frame rate and a compression rate of the video signals in the first and second direction. Before the crawler device ascends a step or stairs with the auxiliary crawler positioned backward, the controller brings the auxiliary crawler into a preparatory state in which the auxiliary crawler is freely rotatable with respect to the main crawler or the auxiliary crawler is maintained in a position above a line extending longitudinally from the main crawler by a predetermined angle. The projected complementary images may also be pre-shifted to compensate for subsequent wavelength shifts occurring while viewing the images. The step of partially removing the light emitting laminate is performed such that each of the plurality of light emitting structures has a top view shape of a circle or a 4n-gon having rounded corners.