手机用TFT-LCD驱动控制芯片电源模块设计

Design of Power Block for TFT-LCD Driver IC Used for Mobile Phone

电源模块是TFT-LCD驱动控制芯片内置模拟电路的一个重要组成部分,其性能直接影响着芯片的功耗以及彩屏手机的显示画质。文章从TFT-LCD的驱动原理出发,提出了一种低功耗、易调节的电源模块设计思想,所产生的电压值可实现编程控制。用Hspice对采用0.25μmCMOS工艺设计的电路进行仿真表明,系统在启动200ms后能够生成稳定、正确的驱动电源电压,其静态功耗小于2mW。

Power block is an important part of analog circuits for driver IC and affects the performances and power consumption of TFT-LCD driver IC directly. In this paper, the driving principles of TFT-LCD are discussed, and the design methodology of power block with low power consumption and easyadjusting functions are proposed. The voltages generated by power block can be adjusted by programming. Finally, the Hspice simulation results of the circuits designed with 0.25μm COMS process are given. It is shown that the stable and correct driving voltages can be generated in 200 ms after the system starts. Furthermore, its total static power consumption is less than 2 mW.