An image display device incorporating a quick-action electron source is disclosed. The game symbol groups provide a first level of game play whereby players with winning game symbol groups can receive instant prize awards. The device 1 also comprises a measurement module 15, having two measurement terminals 151, 152, electrically connected with the first 11 and the second 12 conductive members, respectively; the measurement module 15 is configured to provide an electric potential difference between the first 11 and the second 12 conductive members. The assembly also includes a vibrator for vibrating the screens and a mechanism for sequentially depositing the aggregate material that is retained on each screen or that passes through all of the screens in the weighing pan. The generator assigns the input bits in the fixed-point number to a plurality of slots, generates the sign-bit field, generate the exponent field based on a bit position of a leading significant bit, and generate the mantissa field by extracting a first bit group and a second bit group and by providing a start bit of the first bit group after a last bit of the second bit group.