Patent ID: 7623109
Filing Date: 2009-11-24
Classification: G09G,H03K

Abstract:
1. A display device having a level converting circuit which converts input signals having a small amplitude into signals having a larger amplitude, wherein the level converting circuit comprises: a sample-hold circuit which samples the input signals; a transistor comprising a gate electrode to which an output voltage of the sample-hold circuit is inputted; a first switching element of which a first electrode is connected to a first power line supplying a first power source voltage; a second switching element of which a first electrode is connected to a second electrode of the first switching element, and of which a second electrode is connected to a second electrode of the transistor; a voltage holding circuit connected to the first electrode of the second switching element; an inverter circuit connected to the first power line and a second power line which supplies a second power source voltage, and to which an output voltage from the voltage holding circuit is inputted; and a bias circuit connected to the second power line, and which provides a bias voltage to a first electrode of the transistor, the bias voltage decreasing a threshold voltage of the transistor.