Arthropod-controlling composition comprising an -pyrone compound shown by the formula: 1as an active ingredient provides an excellent activity for controlling arthropods, and therefore, the composition is utilized for controlling harmful arthropods. The shield electrode may be provided in the same layer as gate bus lines, or in the same layer as the source bus lines. The radiation sensing element bonds directly to, and in optical contact with, either the array of photosensors or an array of optical fibers that guide light to the array of photosensors.