Patent ID: 6930529
Filing Date: 2005-08-16
Classification: G09G,H03K

Abstract:
1. An offset compensation circuit compensating for an offset voltage of a drive circuit outputting a potential according to an input potential, comprising: first to N-th capacitors where N is an integer of at least two, said capacitors each having one electrode and the other electrode, the first capacitor having one electrode connected to an input node of said drive circuit, and second to N-th capacitors each having one electrode connected to the other electrode of a preceding capacitor; a first switch circuit supplying a predetermined potential to the input node of said drive circuit and connecting the other electrode of said first capacitor to an output node of said drive circuit to charge said first capacitor to said offset voltage; a second switch circuit successively selecting said second to N-th capacitors each for a predetermined period of time, supplying said input potential to one electrode of a selected capacitor and connecting the other electrode of the selected capacitor to the output node of said drive circuit to charge said first to N-th capacitors to said offset voltage; and a third switch circuit supplying said input potential to the other electrode of said N-th capacitor.