The present invention discloses a system and method for generating a beam of fast ions. The scheme, proposed in this document, can be used in any transmission based on no differential modulation. Thus, a quantization matrix conforming to the human vision system can be obtained by controlling the model parameters and the subjective quality of the encoded picture can be easily controlled. The present disclosure also relates to a method of preparing a pharmaceutical composition comprising eslicarbazepine acetate. The light emitting unit includes a first electrode opposing an outer surface of the at least one portion, a second electrode provided between the first electrode and the at least one portion, the second electrode being light-transmissive, and an organic light emitting layer provided between the first electrode and the second electrode.