Charge recovery scheme

摘要

Shuttering eyewear (or shutter glasses) may be used to enable stereoscopic 3D and to provide different images to two viewers using a single display, known as Dual View. The shuttering eyewear may utilize charge recovery circuits. The charge recovery circuits may achieve high charge recovery efficiencies on the order of 80 to 90 percent resulting in a dramatic reduction in power supply battery operating current and a resulting increase in operating time. The charge recovery circuits may utilize switch mode boost conversion to recover most of the charge from a shutter that is being closed to one that is to be opened. Further, a charge recovery method for utilizing energy stored on a capacitive storage device may include closing a first active shutter, moving charge to a converter in buck mode to a capacitor, and pulling charge from the capacitor to open a second shutter.

主权项

1. A charge recovery method utilizing energy stored on a capacitive storage device, comprising:
closing a first switch (SLR), which allows a first liquid crystal cell to charge a first inductor; increasing the voltage on a first capacitor by alternately opening and closing a second switch (SREC) until the voltage is discharged from the first liquid crystal cell; and closing a third switch (SLG) to maintain an approximately zero voltage on the first liquid crystal cell.