Patent ID: 6710773
Filing Date: 2004-03-23
Classification: G09G

Abstract:
An integrated circuit for supplying a drive voltage to an electroluminescent (EL) panel, comprising:an output terminal for connection to said EL panel; a high voltage power supply for producing a DC output, said high voltage power supply including plurality of charge pump circuits; and a switching circuit coupled to said output terminal for alternating said DC output at said output terminal; wherein said plurality of charge pump circuits comprise: a first diode coupled to a first output of said charge pump circuit for preventing discharge of said first output; a first capacitor having a first terminal coupled to a first phase of a clock input and further having a second terminal coupled to said first diode for charging said output through said first diode; a second capacitor having a first terminal coupled to a second phase of a clock input and further having a second terminal coupled to a second output of said charge pump circuit for discharging said second output; and a second diode coupled to said second terminal of said second capacitor and further couple to said second terminal of said first capacitor.