Simple active-matrix-LCD bias supply operates from battery input

摘要

Many active matrix-lgd applications need multiple Voltages for thin film transistor (TFT) bias. Typically, three voltages are necessary: 5V for the column driver; a positive voltage, such as 10V and a negative voltage, such - 5V for the TFT gate drive, or row driver. For handheld electronic devices, a battery must produce these voltages. The most popular batteries in these devices are two-cell NiGd alkaline or one-cell lithium-ion batteries.