An electrochemical cell is provided having a non-cylindrical container including one or more side walls each having a curved surface that curves radially inward. The method for generating user preference data comprises obtaining an image color characteristic value of a preference image and a reference image, generating {preference value, reference value} which corresponds to a pair of the preference value and the reference value, and generating the pair {preference value, reference value} as preference meta-data having at least one feature block. The encapsulation member includes a plurality of organic layers and a plurality of inorganic layers.