Gate-on voltage generator, driving device and display apparatus comprising the same

A driving device , comprising:

• a boost converter receiving and boosting a first input voltage and outputting a driving voltage and a pulse signal, the driving voltage and an amplitude of the pulse signal not being influenced by an ambient temperature;
• a gate-on voltage generator including a first temperature sensor that outputs a first temperature-dependent variable voltage and a first charge-pumping unit that shifts the first temperature-dependent variable voltage by the amplitude of the pulse signal and that outputs a gate-on voltage, the first temperature-dependent variable voltage varying in inverse proportion to the ambient temperature;
• a gate-off voltage generator including a second temperature sensor that outputs a second temperature-dependent variable voltage and a second charge-pumping unit that shifts the second temperature-dependent variable voltage by the amplitude of the pulse signal and that outputs a gate-off voltage, the second temperature-dependent variable voltage varying in proportion to the ambient temperature;
• and
• a switching unit which outputting a clock signal that swings between the gate-on voltage and the gate-off voltage.

A display apparatus comprising:

• a driving device including a boost converter that receives and boosts a first input voltage and that outputs a driving voltage and a pulse signal, the driving voltage and an amplitude of the pulse signal not being influenced by an ambient temperature, a gate-on voltage generator including a temperature sensor receiving a driving voltage and producing a temperature-dependent variable voltage, the level of which varies according to an ambient temperature, and a charge pumping unit shifting the temperature-dependent variable voltage by an amplitude of the pulse signal and generating a gate-on voltage;
• a gate-off voltage generator shifting a voltage level of a second input voltage by the amplitude of the pulse signal and generating a gate-off voltage, and a switching unit generating a clock signal having a swing of a voltage difference between the gate-on voltage and the gate-off voltage;
• a gate driver receiving the clock signal and outputting the gate driving signals each having an amplitude increasing when the ambient temperature falls and decreasing when the ambient temperature rises consecutively;
• a data driver providing gray voltages corresponding to image data;
• and
• a display panel displaying images corresponding to the gray voltages responsive to the gate driving signals.