A liquid crystal display module for preventing noise caused by friction between a support main and a light guide plate is provided. In one embodiment of the invention, a method for filtering and sorting activity objects in an activity-centric computing environment can include generating at least one activity thread of hierarchically arranged activity objects, selecting at least one filtering criterion for the activity objects, and filtering the activity objects in the activity threads. Each of the symbol groups is associated with a symbol group designation position on the reel strip.