A binarizing device operates for controlling a slice level relative to a DC level of a reproduced signal in response to a slice level control signal to generate a controlling-resultant slice level, and for comparing the reproduced signal with the controlling-resultant slice level to convert the reproduced signal into a binary signal. The method is developed for non quasi-cyclic RS-based LDPC code decoder implementation. A fastener extends into the passage of each leg and the underlying perforation from below the wall to anchor each leg to the wall under pressure thereby providing a seal between each leg and the wall. A panel driver displays an image based on the four-color data on the liquid crystal panel.