DC-DC converter, display apparatus having the same and method of driving display panel using the same

A display apparatus comprising:

• a display panel configured to display an image;
• a DC-DC converter comprising:
• a temperature compensating part configured to generate a first ON voltage at a temperature equal to or greater than a threshold temperature and a second ON voltage at a temperature less than the threshold temperature based on a gate clock signal according to a select signal;
• a clock generating part configured to generate a first clock signal and a first clock bar signal based on the first ON voltage using a first charge sharing resistor at the temperature equal to or greater than the threshold temperature and to generate a second clock signal and a second clock bar signal based on the second ON voltage using a second charge sharing resistor at the temperature less than the threshold temperature;
• a gate driver configured to generate a gate signal based on the first clock signal, the first clock bar signal, the second clock signal and the second clock bar signal and to provide the gate signal to the display panel;
• and
• a data driver configured to generate a data voltage and to provide the data voltage to the display panel,
• wherein the first clock bar signal having different timing from the first clock signal, and the second clock bar signal having different timing from the second clock signal,
• wherein the select signal is determined by a combined resistance of a variable resistor varied according to an ambient temperature, a first resistor which is connected to the variable resistor in series and a second resistor which is connected to the variable resistor in parallel, and
• wherein the clock generating part comprises:
• a first generating circuit configured to generate the first clock signal and the second clock signal;
• a clock terminal connected to the first generating circuit a second generating circuit configured to generate the first clock bar signal and the second clock bar signal;
• a clock bar terminal connected to a first end of the second generating circuit and a second selecting part configured to connect the first charge sharing resistor and the second charge sharing resistor to a second end of the second generating circuit according to the select signal.

A method of driving a display panel including a clock generating part, the clock generating part comprising:

• a first generating circuit a clock terminal connected to the first generating circuit a second generating circuit configured;
• a clock bar terminal connected to a first end of the second generating circuit and a second selecting part connecting a first charge sharing resistor and a second charge sharing resistor to a second end of the second generating circuit according to a select signal, the method comprising:
• generating a first ON voltage at an ambient temperature equal to or greater than a predetermined threshold temperature and generating a second ON voltage at an ambient temperature less than the threshold temperature based on a gate clock signal according to a produced select signal;
• operating the first generating circuit to generate the first clock signal and operating the second generating circuit to generate the first clock bar signal based on the first ON voltage using the first charge sharing resistor at the temperature equal to or greater than the threshold temperature;
• operating the first generating circuit to generate the second clock signal and operating the second generating circuit to generate the second clock bar signal based on the second ON voltage using the second charge sharing resistor at the temperature less than the threshold temperature;
• generating a gate signal based on the first clock signal, the first clock bar signal, the second clock signal and the second clock bar signal;
• generating a data voltage;
• and
• displaying an image based on the gate signal and the data voltage,
• wherein the first clock bar signal having different timing from the first clock signal, and the second clock bar signal having different timing from the second clock signal, and
• wherein the select signal is determined by a combined resistance of a variable resistor varied according to an ambient temperature, a first resistor which is connected to the variable resistor in series and a second resistor which is connected to the variable resistor in parallel.