Power saving circuit for display panel
AssigneeHyundai Electronics Industries Co., Ltd.
InventorJeung Hie Choi
Life of this patent
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Abstract
A power saving circuit for a liquid crystal panel (LCD) and a plasma display panel (PDP) recovers an energy charged in a panel capacitor through one path of a drive IC driving a scan electrode or data electrode for the PDP, and recovers the energy charged in the panel capacitor through one path of a column drive IC or row drive IC for the LCD panel. The energy recovery path can be a parasitic diode or protective diode of the drive IC. The power saving circuit can operate in an addressing period.
Claims24
A power saving circuit for a display panel, comprising:
- a display panel;
- a power switch that switches a first prescribed voltage level;
- a drive IC that drives the display panel;
- and
- an energy recovering circuit connected to the power switch and the drive IC that recovers electric charges charged in a panel capacitor of the display panel through a first path of the drive IC and transmits the recovered electric charges to the display panel through a second path of the drive IC when re-driving the display panel.
A power saving circuit for a display panel, comprising:
- a display panel;
- a power switch that switches a power supply voltage;
- a drive IC that drives the display panel;
- and
- an energy recovering unit connected to the power switch and the drive IC that recovers electric charges charged in a panel capacitor of the display panel through a first path of the drive IC and transmits the recovered electric charges to the display panel through a second path of the drive IC when re-driving the display panel, wherein the energy recovering unit 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 device connected between a first electrode of the first transistor and a prescribed reference voltage,
- 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.
A method of operating a display panel, comprising:
- driving a display panel with a first power supply voltage through a drive IC;
- recovering electric charges charged in a panel capacitor of the display panel through a first path of the drive IC in a energy recovery circuit;
- transmitting the recovered electric charges to the display panel through a second path of the drive IC;
- re-driving the display panel with the first power supply through the first path of the drive IC;
- and
- repeating the recovering through re-driving steps.
Dependencies are inferred from the claim text.