Patent ID: 7764022

Claim:
A display apparatus having a backlight section and a load other than said backlight section, said display apparatus comprising: an input-voltage generation section for generating a direct current input voltage from an alternating current; a first power conversion section for receiving said direct current input voltage, and for carrying out a DC-DC power conversion process on the direct current input voltage to generate a direct current power-supply voltage to be supplied to said load; a second power conversion section connected in parallel with said first power conversion section, and including: a primary side for receiving said direct current input voltage, and including: a pair of series connected switches for switching the direct current input voltage to generate an alternating current input voltage supplied to a primary winding of at least one transformer, and a driving circuit for driving said pair of series connected switches, a secondary side, isolated from said primary side by said at least one transformer, for generating, from an alternating current output voltage supplied by a secondary winding of the at least one transformer, a power-supply voltage to be supplied to a plurality of parallel connected backlights of said backlight section, a detection circuit connected in series with only one of the plurality of parallel connected backlights for detecting a voltage supplied to that backlight, and a feedback section for receiving the detected voltage from said detection circuit, for rectifying the detected voltage, and for supplying the rectified voltage to said driving circuit of said primary side of said second power conversion section, said driving circuit controlling the quantity of light emitted by the plurality of parallel connected backlights to a constant value based on the rectified voltage; and a display section for displaying a picture using said backlight section.