Power supply device, display device including the power supply device, and driving method using the same

摘要

The described technology relates generally to a power supply, a display device including the same, and a driving method thereof to reduce power consumption of the display device. Embodiments include a power source voltage controller sensing a panel current flowing in the display panel and controlling a feedback voltage according to the panel current and the power source voltage, and a DC-DC converter generating a power source voltage according to the feedback voltage to respectively supply it to the plurality of light emitting elements.

主权项

1. A power supply employable for supplying a power source voltage including a first power source voltage and a second power source voltage to a panel including a plurality of elements, the power supply comprising:
a power source voltage controller to generate panel current data corresponding to a total current flowing in the plurality of elements of the panel by varying the second power source voltage within a predetermined range and fixing the first power source voltage, to obtain a power source voltage-panel current characteristic curve based on the panel current data of the second power source voltage, the power source voltage-panel current characteristic curve representing a change of the total current of the second power source voltage, to determine a target voltage value based on the power source voltage-panel current characteristic curve, and to control a feedback voltage for controlling the second power source voltage to be at least substantially equal to the target voltage value; and a DC-DC converter to generate the first and second power source voltages, to control a voltage difference between the first and second power source voltages according to the feedback voltage, and to supply the second power source voltage to the elements, wherein an optimization of the second power source voltage is controlled by increasing or decreasing the feedback voltage according to the target voltage value determined in the power source voltage-panel current characteristic curve, wherein: when the second power source voltage is higher than the target voltage, the total current is limited such that the panel is not able to display a full white grayscale, and when the second power source voltage is lower than the target voltage, unnecessary power consumption is caused to generate the second power source voltage.