A liquid crystal display module includes: a liquid crystal display panel, a surface light-emitting lamp irradiating light to the liquid crystal display panel by a surface light-emission, and a power source supplying an electric power to the surface light-emitting lamp. The contactor preferably includes a plurality of spaces adapted to receive any number, up to its limit, of contact modules. The switch chip is connected to either the first group of pins or the second group of pins according to a type of a card connected to the connector. The method can also include determining a number of pending memory retrieval requests, and then processing a new retrieval request if the number of pending memory retrieval requests is at or below the memory request limit parameter. In operation, target light levels selected with the portable commissioning device and the controller unit is remotely programmed to automatically maintain the target level. Graphs are compared in blocks of 1000 images at a time using a two-pass comparison algorithm to identify the top matches for each graph.