Liquid crystal display and driving method thereof

1. A liquid crystal display, comprising:

a liquid crystal panel;

a panel driver configured to drive the liquid crystal panel;

light emitting sources configured to provide light to the liquid crystal panel;

driving transistors configured to drive the light emitting sources;

a transistor driver configured to control the driving transistors;

a DC power source configured to supply DC power to the light emitting sources; and

a power controller configured to:

perform a logic operation, on a first signal supplied externally and on a plurality of second signals generated by the transistor driver, to generate a result value, the logic operation comprising:

an OR operation performed on the second signals to generate a third signal; and

an AND operation performed on the third signal and the first signal to generate a fourth signal as the result value; and

enable or disable an output of the DC power source based on the result value,

wherein each of the first signal and the plurality of second signals comprises a pulse width modulation signal, and

wherein at least two of the plurality of second signals have overlapping high periods.

2. The liquid crystal display of claim 1 , wherein the power controller comprises:

an OR gate for performing the OR operation on the second signals; and

an AND gate for performing the AND operation on an output of the OR gate and the first signal.

3. The liquid crystal display of claim 1 , wherein the power controller is further configured to disable the output of the DC power source during an interval in which the second signals are all in the logic low state.

4. A liquid crystal display, comprising:

a liquid crystal panel;

a panel driver configured to drive the liquid crystal panel;

light emitting sources configured to provide light to the liquid crystal panel;

driving transistors configured to drive the light emitting sources;

a transistor driver configured to control the driving transistors;

a DC power source configured to supply DC power to the light emitting sources; and

a pulse width modulator, configured to:

perform a logic operation on a signal generated internally and a signal supplied from the transistor driver to generate a result value;

enable or disable an output of the DC power source based on the result value; and

generate a first signal for controlling the DC power source,

wherein the transistor driver is further configured to:

generate a plurality of second signals for controlling the driving transistors, and

perform an OR operation on the plurality of second signals to generate a third signal and supply the same to the pulse width modulator,

wherein the pulse width modulator is further configured to perform an AND operation, on the third signal and the first signal, to generate a fourth signal as the result value,

wherein each of the first signal and the plurality of second signals comprises a pulse width modulation signal, and

wherein at least two of the plurality of second signals have overlapping high periods.

5. The liquid crystal display of claim 4 , wherein:

the transistor driver comprises an OR gate configured to perform the OR operation on the second signals; and

the pulse width modulator comprises an AND gate configured to perform the AND operation on an output of the OR gate and the first signal.

6. The liquid crystal display of claim 4 , wherein the pulse width modulator is further configured to disable the output of the DC power source during an interval in which the second signals are all in the logic low state.

7. A driving method of a liquid crystal display, the method comprising:

driving a DC power source to boost a first DC power voltage supplied from an external source into a second DC power voltage and supply the same to a backlight unit;

driving driving transistors of the backlight unit to emit light from the backlight unit; and

displaying an image on the liquid crystal panel using the light emitted from the backlight unit,

wherein, in the driving of the DC power source, an output of the DC power source is enabled or disabled with reference to signals supplied to the driving transistors,

wherein, in the driving of the DC power source:

a logic operation is performed to generate a result value, the logic operation being performed on:

a first signal supplied externally or generated internally, and

a plurality of second signals,

an OR operation is performed on the second signals to generate a third signal,

an AND operation is performed on the third signal and the first signal to generate a fourth signal as the result value, and

an output of the DC power source is enabled or disabled based on the result value,

wherein each of the first signal and the plurality of second signals comprises a pulse width modulation signal, and

wherein at least two of the plurality of second signals have overlapping high periods.

8. The method of claim 7 , wherein, in the driving of the DC power source, the output of the DC power source is disabled during an interval in which the second signals are all in the logic low state.