Extremely low vacuum support method for field emission light and apparatus using the same

This invention discloses a method for supporting an extremely low vacuum for field emission light and the apparatus using the same. By heating a getter of the field emission light, it is capable of preventing the getter from being saturated so as to support the extremely low vacuum of the field emission light, wherein the heating method may utilize a continuous heating, a predetermined time heating, a current threshold heating, a trigger heating or the combination thereof. The present invention further discloses the apparatus for supporting the extremely low vacuum, which comprises a getter having a heat pad and a low voltage output module. When the low voltage output module outputs powers, the heat pad is heated to activate the getter such that the field emission light is capable of supporting the extremely low vacuum by the getter to increase the life time and the illumination.