Image display apparatus

An image display apparatus comprising:

• a display;
• and
• a power supply configured to supply a driving voltage to the display,
• wherein the power supply comprises:
• an AC/DC converter comprising at least one switching device and configured to convert an input AC voltage into a DC voltage and output the DC voltage to a dc link;
• a dc link capacitor disposed at the dc link;
• an input voltage detector configured to detect the input AC voltage;
• a dc link voltage detector configured to detect a dc link voltage at the dc link;
• a controller configured to control the AC/DC converter;
• a first DC/DC converter configured to convert a level of the de link voltage and to supply the dc link voltage having the converted level to the controller;
• and
• a second DC/DC converter configured to convert a level of the de link voltage and supply the driving voltage to the display,
• wherein in response to the detected input AC voltage exceeding a first reference value and the detected dc link voltage being lower than or equal to a second reference value, which is lower than the first reference value, the controller is configured to turn off the switching device in the AC/DC converter.

An image display apparatus comprising:

• a display;
• and
• a power supply configured to supply a driving voltage to the display,
• wherein the power supply comprises:
• an AC/DC converter comprising at least one switching device and configured to convert an input AC voltage into a DC voltage and output the DC voltage to a dc link;
• a dc link capacitor disposed at the dc link;
• a dc link voltage detector configured to detect a dc link voltage at the de link;
• and
• a controller configured to control the AC/DC converter,
• wherein after being powered on and before operation of the switching device in the AC/DC converter, the controller is configured to determine whether the detected dc link voltage is lower than or equal to a reference value, and when the detected dc link voltage is lower than or equal to the reference value, the controller is configured to stop the AC/DC converter, and
• wherein in response to a voltage detected by the dc link voltage detector exceeding the reference value, the controller is configured to increase the de link voltage to a target voltage, and after the dc link voltage reaches the target voltage, the controller is configured to control the dc link voltage to maintain the target voltage.