Backlight system, display apparatus, and control method for backlight system

A display apparatus comprising:

• a backlight system that comprises
• a plurality of light emitting elements that operate as a light source of a backlight using bus-supplied electric power in which a voltage is changed to one of a plurality of predetermined values as a power source,
• a plurality of serial connection switches that connect the plurality of light emitting elements in series and disconnect connections among the plurality of light emitting elements,
• a plurality of parallel connection switches that connect the plurality of light emitting elements in parallel relative to the power source and disconnect the connections among the plurality of light emitting elements,
• a bus switch that turns on or turns off supply of the bus-supplied electric power;
• and
• a controller that turns on the bus switch after turning on or turning off the plurality of serial connection switches and the plurality of parallel connection switches in accordance with the value of the voltage corresponding to the bus-supplied electric power;
• and
• an image display that displays an image by transmitting the backlight.