Power control apparatus for a display device and method of controlling the same
View Patent ↗A power control apparatus for a display device that measures a power supply voltage and a cathode voltage and adjusts electrical characteristics that deviate from predetermined conditions to satisfy the conditions, thus preventing damage of a panel due to an excessive current and deterioration. The power control apparatus comprises a first power supply line for transmitting a first level of power supply voltage to a pixel; a second power supply line for transmitting a second level of power supply voltage to the pixel; a DC power generator for generating the first level of power supply voltage and the second level of power supply voltage; and an output detecting unit connected to an output of the DC power generator and for measuring a driving current of a display device. The output detecting unit includes an output detecting circuit for detecting the driving current of the display device, and an output control unit for comparing the detection signal of the output detecting circuit and a designated level of power supply voltage to adjust the detected output power to the designated level.
1. A power control apparatus of a display device, comprising:
a first line for transmitting a first power supply voltage to a pixel;
a second line for transmitting a second power supply voltage to the pixel;
a DC power generator for generating the first power supply voltage and the second power supply voltage; and
an output detecting unit coupled to an output of the DC power generator and for measuring a driving current of the display device,
wherein the output detecting unit comprises,
an output detecting circuit for measuring the driving current and outputting a detection signal based on the measured driving current; and
an output control unit for conducting a comparison of the detection signal and a designated range of output current and adjusting the driving current based on the comparison.
2. The power control apparatus of claim 1 , wherein the output detecting circuit measures the driving current with a current sensor.
3. The power control apparatus of claim 1 , wherein the output control unit comprises:
a control circuit for controlling the DC power generator according to the comparison; and
an output converting circuit for controlling an output signal of the DC power generator according to the comparison.
4. The power control apparatus of claim 3 , wherein the output converting circuit adjusts at least one of the first power supply voltage and the second power supply voltage according to a voltage converting control signal from the control circuit.
5. The power control apparatus of claim 4 , wherein the output converting circuit comprises a potentiometer.
6. The power control apparatus of claim 1 , wherein the display device is a flat panel display device.
7. The power control apparatus of claim 6 , wherein the display device is an organic electroluminescence display device or a liquid crystal display device using an organic electroluminescence device as a light emitting source.