A concatenated channel decoding method wherein the bits of a set of N1 bits decoded using a first iterative block decoding algorithm and intended to be decoded using a second block decoding algorithm, are sent in parallel in at least one subset of P bits to a buffer for temporary storage. A conformal phosphor layer is provided on the oblique sidewall. The part can be housed in a gantry system that holds the part stable. A thermal conductive resin layer of a substantially constant thickness is disposed between the second surface of the semiconductor element and the bottom interior surface of the recessed inner wall of the heat spreader. The thin film transistor is formed in such a manner that a buffer layer including a high-resistance region and low-resistance regions is formed over an oxide semiconductor layer, and the oxide semiconductor layer and source and drain electrode layers are in contact with each other with the low-resistance region of the buffer layer interposed therebetween.