Patent ID: 7724226

Claim:
A driving circuit for an LCD (Liquid Crystal Display) panel comprising: a pixel charging operational amplifier, to a first input terminal of which a voltage to charge a pixel of said LCD for a current gray-scale display is applied and to a second input terminal of which a voltage to charge a corresponding pixel occurred one field before is applied and an output from which is supplied to said pixel and to which a source voltage having a positive or negative voltage range being wider than a gray-level voltage range of said LCD panel is applied; a charged state detecting unit to detect a charged state of said pixel and to generate an output being different depending on whether a value representing said charged state is within a range of a large deviation from a set value or is within a range of a small deviation from said set value; and a switching unit to cause an OFF state or ON state to occur between said second input terminal of said pixel charging operational amplifier and its output terminal according to an output state of said charged state detecting unit; wherein, when a value representing a charged state of said pixel is within a range significantly deviating from said set value, said switching unit goes into an OFF state which makes said pixel charging operational amplifier operate as a comparator and makes said pixel to be overdriven using said positive or negative source voltage and, when said value representing a charged state of said pixel is within a range of a small deviation from said set value, said switching unit goes into an ON state which makes said pixel charging unit operate as a buffer and makes said pixel be charged by using a voltage corresponding to a current gray-scale display.