Backlight unit and display device having the same

A display device comprising:

• a display panel comprising a plurality of pixels;
• a driving circuit configured to control the display panel such that an image is displayed on the display panel;
• and
• a backlight unit configured to supply a light to the display panel, the backlight unit comprising:
• a power converter configured to generate a light source driving voltage in response to a voltage control signal;
• a plurality of light emitting diode strings configured to receive the light source driving voltage through an end of each of the plurality of light emitting diode strings;
• and
• a controller connected to the other end of each of the plurality of light emitting diode string and configured to generate a plurality of current control signals to control a current flowing through each of the plurality of light emitting diode strings and the voltage control signal,
• wherein:
• the controller comprises a voltage control signal generator configured to generate the voltage control signal corresponding to a current control signal having a widest pulse width from among the plurality of current control signals, that is applied to a light emitting diode string having a lowest forward driving voltage among the plurality of light emitting diode strings;
• and
• the pulse width of each current control signal corresponds to the forward driving voltage of the corresponding light emitting diode string of the plurality of light emitting strings.