A crucible unit comprising: a circulation rail forming a circulation path; a plurality of crucibles for accommodating a deposition source and installed on the circulation rail; a crucible moving unit configured to move the plurality of crucibles along the circulation rail; a crucible filling unit for filling the deposition source in the plurality of crucibles; and a crucible heating unit configured to heat the plurality of crucibles for generating vapor of the deposition source, characterized in that the crucible heating unit comprises a first power source being electrically connected to a first supply pad so as to apply a first voltage and a second power source being electrically connected to a second supply pad so as to apply a second voltage which is different form the first voltage; and each crucible comprises a heat wire embedded in the crucible and at least one of a first contact pad corresponding to the first supply pad of the first power source and a second contact pad corresponding to the second supply pad of the second power source, both being formed on the external surface of the crucible and being electrically connected with the heat wire, wherein (i) if the crucible comprises only the first contact pad the first power source is being electrically connected via the first supply pad to the first contact pad; or (ii) if the crucible comprises only the second contact pad the second power source is being electrically connected via the second supply pad to the second contact pad; or (iii) if the crucible comprises the first contact pad and the second contact pad, the crucible heating unit further comprises a first switch disposed between the first power source and the first power supply pad, and a second switch disposed between the second power source and the second power supply pad, so as to either connect the first power source via the first supply pad to the first contact pad or to connect the second power source via the second supply pad to the second contact pad. a circulation rail forming a circulation path; a plurality of crucibles for accommodating a deposition source and installed on the circulation rail; a crucible moving unit configured to move the plurality of crucibles along the circulation rail; a crucible filling unit for filling the deposition source in the plurality of crucibles; and a crucible heating unit configured to heat the plurality of crucibles for generating vapor of the deposition source, characterized in that the crucible heating unit comprises a first power source being electrically connected to a first supply pad so as to apply a first voltage and a second power source being electrically connected to a second supply pad so as to apply a second voltage which is different form the first voltage; and each crucible comprises a heat wire embedded in the crucible and at least one of a first contact pad corresponding to the first supply pad of the first power source and a second contact pad corresponding to the second supply pad of the second power source, both being formed on the external surface of the crucible and being electrically connected with the heat wire, wherein (i) if the crucible comprises only the first contact pad the first power source is being electrically connected via the first supply pad to the first contact pad; or (ii) if the crucible comprises only the second contact pad the second power source is being electrically connected via the second supply pad to the second contact pad; or (iii) if the crucible comprises the first contact pad and the second contact pad, the crucible heating unit further comprises a first switch disposed between the first power source and the first power supply pad, and a second switch disposed between the second power source and the second power supply pad, so as to either connect the first power source via the first supply pad to the first contact pad or to connect the second power source via the second supply pad to the second contact pad. (i) if the crucible comprises only the first contact pad the first power source is being electrically connected via the first supply pad to the first contact pad; or (ii) if the crucible comprises only the second contact pad the second power source is being electrically connected via the second supply pad to the second contact pad; or (iii) if the crucible comprises the first contact pad and the second contact pad, the crucible heating unit further comprises a first switch disposed between the first power source and the first power supply pad, and a second switch disposed between the second power source and the second power supply pad, so as to either connect the first power source via the first supply pad to the first contact pad or to connect the second power source via the second supply pad to the second contact pad.