The present invention provides a display device. The method further includes pressing a mold against the photoreactive resin, the mold including a transparent substrate having a concave-convex pattern, and a light-blocking film provided on a part of surfaces of the concave-convex pattern. 5 and y is greater than or equal to about 3. The first and second side members and the first and second cross members are further configured to receive first and second lower suspension control arms, first and second upper suspension control arms, and a portion of the steering linkage for the vehicle. In this connection, means are provided for the monitoring of the state of at least some of the electrical elements as well as means in order to select the time for a respective voltage and current detection in dependence on the detected state of the electrical elements andor to fix the conditions for a respective voltage and current detection. Defining an acceptable slop range as a percentage allows the trader to monitor and regulate their profits and loss, regardless of the type of spread trading algorithm used or the placement of an order on the spread price axis.