Patent ID: 6897834

Claim:
An energy recovery matrix display driver circuit for generating a voltage having a periodically changing polarity across a capacitive load, said driver circuit comprising: an inductor being coupled to the capacitive load, a first switch for creating, during a resonance period, a resonant circuit including the inductor and the capacitive load to change said voltage from a first polarity to a second polarity, and a second switch for coupling, after the resonance period, the capacitive load to a power supply voltage having the second polarity, a switch circuit connected in parallel with the inductor for circulating a current through the inductor in a loop formed by said switch circuit and said inductor, said loop being closed not later than an instant at which said current changes polarity at the end of the resonance period, and a control circuit for controlling the first switch, the second switch, and the switch circuit to periodically open and close.