An imaging apparatus for two-stage light modulation in high-definition digital projection or cinema can include two light modulators. The present invention also provides methods to derive the pluripotent cell line from human embryonic stem cells. In the plasma display apparatus, ultraviolet rays caused by a discharge are efficiently transmitted to phosphor members on the surfaces of cells to emit light with a reduced loss of energy. A connecting element electrically connects the conductors to respective cores of a second electrical cable.