基于可调电荷泵的双模式高压开关控制器

Design of Dual-mode High-voltage Switch Controller Based on Adjustable Charge Pump

为了防止在液晶显示面板上发生闪烁和减小栅驱动器的馈通现象,设计了一种基于可调电荷泵的用于TFT-LCD液晶显示的片内双模式高压开关控制器,该控制器能减小液晶显示功耗,减少栅走线和液晶面板之间的耦合效应,其输出延时和下降斜率可调并输入到栅驱动器中,从而避免液晶显示设备错误的显示。该基于可调电荷泵的高压开关控制器的芯片已在UMC0.6μm-BCD工艺线投片,电荷泵输出可调电压范围为10～30V,测试结果证明,高压开关控制器电路工作良好,其面积为0.32mm2,静态电流小于3μA。

To prevent occurrence of flicker phenomenon in a gate driving unit of a liquid switch controller was designed. It can minimize phenomenon on a liquid crystal, and feed through crystal display device, a dual-mode high-voltage power consumption and reduce coupling effect between gate line and pixel. It applies an output voltage having time delay and adjustable falling rate to the gate driving unit for preventing erroneous operation of the liquid crystal display device. An adjustable charge pump employing this high-voltage switch controller circuit has been implemented in UMC 0.6 μm-BCD process, the output of charge pump is 10～30 V,the results indicate that the circuit works well and effectively. The chip area of the controller circuit is 0.32 mm^2, and it consumes less than 3 uA quiescent current.