▎ 摘　　要

NOVELTY - Backboard comprises a silicone layer, a reinforcement layer and a polycarbonate (PC) layer (1) arranged in sequence from top to bottom, the reinforcing layer (2) is composite materials, and the composite material includes glass fibers. USE - The backboard is useful in fields of mobile phone backboard. ADVANTAGE - The backboard has ultra-thin thickness, high strength and stain proof. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparing ultra-thin backboard, comprising (i) measuring organosilicon compound, reinforcing fiber and polycarbonate, stirring and mixing to obtain premix, (ii) choosing premix and adding to extruder, melt extruding, and shaping to obtain composite material, and (iii) choosing PC board and composite material, laminating and bonding composite material and PC board to obtain composite board, coating silica gel on composite board, and drying to obtain backboard. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of structure of backboard.