Patent ID: 9330626
Filing Date: 2016-05-03
CPC Classification: G09G,H03K

Claim Text:
1. A driving circuit comprising a voltage dividing module, a comparing module and a switching module, wherein a first terminal of the voltage dividing module is connected to a first terminal of the switching module, a second terminal of the voltage dividing module is connected to a first terminal of the comparing module, and a third terminal of the voltage dividing module serves as a grounding terminal; the voltage dividing module receives an output voltage of the switching module, and outputs a feedback voltage to the comparing module after dividing the output voltage; a second terminal of the comparing module is connected to a first voltage input terminal, third, fourth and fifth terminals of the comparing module are connected to three control terminals of the switching module respectively; the comparing module outputs control signals to the switching module according to a comparison of the feedback voltage and a first voltage input from the first voltage input terminal; the first terminal of the switching module is connected to a voltage output terminal, a second terminal of the switching module is connected to the first voltage input terminal, a third terminal of the switching module is connected to a second voltage input terminal, and a fourth terminal of the switching module is connected to a third voltage input terminal; the switching module controls its own state according to the control signals output from the comparing module so as to output a voltage to the voltage output terminal, wherein the second voltage of the second voltage input terminal is higher than the first voltage of the first voltage input terminal, and the first voltage of the first voltage input terminal is higher than the third voltage of the third voltage input terminal, the switching module outputs the second voltage to the voltage output terminal when the feedback voltage is lower than the first voltage, and outputs the first voltage to the voltage output terminal when the feedback voltage is equal to the first voltage, wherein the first voltage is a target driving voltage.