Patent ID: 8547370

Claim:
A voltage generating circuit providing a gate-on voltage and a gate-off voltage with a gate driver that includes an output transistor outputting a gate pulse in response to the gate-on voltage and the gate-off voltage to a corresponding gate line, the voltage generating circuit comprising: a driving voltage generator that receives an external input voltage and outputs a first driving voltage and a second driving voltage, the first driving voltage being maintained at a constant level, the second driving voltage being varied in accordance with an external temperature in response to a feedback voltage; a temperature compensator that receives the second driving voltage, generates the feedback voltage as a function of the external temperature and the second driving voltage, and applies the feedback voltage to the driving voltage generator; a gate-off voltage generator that receives the first driving voltage and generates a gate-off voltage being maintained at constant levels independently of the external temperature; and a gate-on voltage generator that receives the second driving voltage and generates a gate-on voltage that is changed in response to the external temperature; wherein the driving voltage generator comprises: a first driving voltage generator that changes the external input voltage into the first driving voltage and outputs the first driving voltage; a switching voltage generator receiving the external input voltage and the feedback voltage and outputting a switching pulse voltage having an amplitude that is varied in accordance with the feedback voltage; and a second driving voltage generator receiving the switching pulse voltage from the switching voltage generator and rectifying the switching pulse voltage to generate the second driving voltage.