TFT-LCD源极驱动芯片中关键模拟模块的研究与设计

【作者】 王硕；

【导师】 王俊宇；

【作者基本信息】 复旦大学 ， 集成电路工程， 2011， 硕士

【摘要】 平板显示技术的迅猛发展使(?)更加丰富多彩,而TFT-LCD技术无疑是平板显示技术中发展的最最成熟、应用最广泛的显示技术。TFT-LCD的发展浪潮直接推动驱动芯片日新月异的进步,人们对驱动芯片的不断探索与改进也促使TFT-LCD技术进一步完善。驱动芯片主要分为三个部分：时序控制芯片、源极驱动芯片、栅极驱动芯片。本论文主要论述源极驱动芯片中三个关键模拟模块的实现,分别为输出缓冲器、PTAT电流源、RSDS接收器。首先,由于输出缓冲器是源极驱动芯片中最重要的组成部分,所以着重对适用于输出缓冲器的AB类、B类放大器的作深入研究,又由于液晶显示器具有高负载特性,所以要设计可以驱动高负载功能的缓冲器,并应用共源共栅弥勒补偿技术以获得最大的单位增益带宽。然后,PTAT电流源的提出主要是为了克服温度升高引起的输入跨导下降,从而使放大器和RSDS接收器的速度尽可能不受温度影响。最后,为了实现高清晰度的液晶显示器,本文使用RSDS规格的数据传输接口电路,以提高时序控制芯片与源极驱动芯片之间的数据传输速度并克服电磁干扰效应。论文中设计的模拟模块已应用于6bit 720通道TFT-LCD源极驱动芯片中,采用HHNEC0.35um高压工艺予以实现。更多还原

【Abstract】 Fast development of flat panel display technique makes the world more (?) and among all flat panel display technique TFT-LCD is undoubted the most (?) and has been widely used. The developing stream of TFT-LCD directly promotes driver IC progressed day by day. The continually exploring and improvement on driver IC in return makes TFT-LCD more and more perfect.Driver IC consists of three parts:the timing controller, the source driver and the gate driver. This thesis focuses on the implement of three key analog blocks in source driver:output buffer, PTAT current source and RSDS receiver. First, the output buffer is the most important part in source driver, so class-AB and class-B amplifiers are lucubrated, at the same time in order to drive the heavy loading of LCD those output buffers are designed slew rate enhancement. Cascoded Miller compensation technique is used to get the largest unity-gain frequency. Second, the design of PTAT current source is to avoid the decrease of trans-conductance caused by temperature increase, making the speed of output buffer and RSDS receiver almost independent to temperature. Finally, in order to satisfy higher resolution LCD, we use the specification of reduced swing differential signaling (RSDS) as the transition interface in the data receiver, which will increase the data transition speed and reduce the electric magnetic interference (EMI) effect.Those three analog blocks has been applied in a 6bit 720 channels TFT-LCD source driver implemented in HHNEC0.35um HV process.更多还原