Backlight unit and display device having the same

摘要

In a display device, a backlight unit including 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 each configured to receive the light source driving voltage through an end thereof, and a controller connected to the other end of each of the plurality of light emitting diode strings and configured to generate a plurality of current control signals used to control a current flowing through each of the plurality of light emitting diode strings and the voltage control signal. The controller is configured to generate the voltage control signal in response to a current control signal from among the plurality of current control signals, which is applied to a light emitting diode string configured to receive a lowest forward driving voltage among the plurality of light emitting diode strings.

主权项

1. A 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, each of the plurality of light emitting diode strings configured to receive the light source driving voltage through an end thereof; and a controller connected to the other ends of each of the plurality of light emitting diode strings configured to generate a plurality of current control signals to control a current flowing through each light emitting diode string 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.