Patent ID: 8582102

Claim:
A thin film transistor liquid crystal display (TFT-LCD) array substrate comprising a substrate; multilayer array patterns formed on the substrate, and a detecting mark, which is used to detect the size or alignment deviation of one array pattern among the multilayer array patterns and provided in a region of the substrate where the multilayer array patterns are not provided, wherein the detecting mark comprises a detecting area and a detecting pattern which is provided in the same layer as the array pattern to be detected, the detecting pattern is located within the detecting area, and the detecting pattern has transmissivity or reflectivity different from that of the remaining area in the detecting area other than the detecting pattern, wherein the detecting pattern and the array pattern to be detected are formed simultaneously in a same process, wherein the detecting mark is used to detect the size of the array pattern to be detected, the detecting pattern within the detecting area has the same size as that of the array pattern to be detected, and the size of the detecting pattern is obtained by detecting the variation in the transmissivity or the reflectivity of the detecting area compared with a predetermined value, whereby the size of the array pattern to be detected is also obtained.