Patent ID: 6741238
Filing Date: 2004-05-25
Classification: G09G

Abstract:
A power saving circuit for a display panel, comprising:a display panel; a power switch that switches a first prescribed voltage level; a scan drive IC that drives the display panel; a scan common pulse generator coupled to the scan drive circuit; a scan common energy recovery circuit coupled to the scan common pulse generator; a sustain pulse generator coupled to the display panel; and a sustain energy recovery circuit coupled to the sustain pulse generator; and an energy recovering circuit connected to the power switch and the scan drive IC that recovers electric charges charged in a panel capacitor of the display panel through a first path of the scan drive IC and transmits the recovered electric charges to the display panel through a second path of the scan drive IC when re-driving the display panel, wherein the energy recovering circuit operates in an addressing period of the display panel, and wherein the energy recovering circuit comprises, a first diode having a cathode connected at a first node between the power switch and the drive IC, a first transistor having a second electrode connected to an anode of the first diode, a storage capacitor connected between a first electrode of the first transistor and a second prescribed voltage level, a second diode having its cathode connected to the first electrode of the first transistor, and a second transistor having a second electrode connected to an anode of the second diode and a first electrode connected to the first node between the power switch and the drive IC, wherein the energy recovering circuit does not recover the electric charges charged in the panel capacitor when an output channel value of the drive IC is at a low level.