Display apparatus, power voltage generating apparatus, and method of generating power voltage

A method of generating a power voltage supplied to a pixel unit of a display apparatus, the method comprising:

• outputting a high voltage at a power voltage terminal, wherein the outputting is performed by a switching circuit, and a discharging unit coupled to the power voltage terminal is turned off;
• discharging a voltage of the power voltage terminal as the discharging unit is turned on;
• and
• outputting a low voltage at the power voltage terminal, wherein the outputting is performed by the switching circuit, and the discharging unit is turned off,
• wherein the switching circuit alternately outputs the high voltage and the low voltage as a power voltage, and the discharging unit is coupled to the switching circuit, and
• wherein the discharging comprises:
• gradually discharging the power voltage from high voltage to a discharge voltage at the power voltage terminal in a first period of a discharge period;
• and
• maintaining the discharge voltage at the power voltage terminal in a second period of the discharge period after the first period.

A display apparatus comprising:

• a plurality of pixel circuits;
• a data driver to generate a data driving signal to output the data driving signal to the plurality of pixel circuits;
• a scanning driver to generate a scan signal to output the scan signal to the plurality of pixel circuits;
• and
• a power voltage generator to generate a power voltage and output the power voltage through a power voltage terminal to the plurality of pixel circuits,
• wherein the power voltage generator is to alternately output a high voltage and a low voltage at the power voltage terminal as the power voltage, and comprises a discharging unit to discharge the power voltage terminal in a discharge period before the power voltage is changed from the high voltage to the low voltage,
• wherein the power voltage generator gradually discharges the power voltage from the high voltage to a discharge voltage at the power voltage terminal in a first period of the discharge period, and maintains the discharge voltage at the power voltage terminal in a second period of the discharge period.