Adult-sized tricycles may include a large front wheel, a downward-sloping frame, and a riding position in which the lower legs of a rider approximate a head tube angle. The enhancement layer has a thickness from 10 to 100 and conformally covers the discontinuities, seams and grain boundary defects in the barrier layer. The performance of image signal processing performed by the sub-processor is improved, traffic in a system bus for memory transfer is reduced, and a decrease in the performance of the entire system is prevented.