【作者】 黄久松；

【导师】 邹雪城；

【作者基本信息】 华中科技大学 ， 微电子学与固体电子学， 2005， 硕士

【摘要】 液晶显示器件由于具有体积小、重量轻、低电压、低功耗等特点,因而是一种比较流行的平板显示器件。它虽然存在驱动电路逻辑比较复杂、较难与单片机连接等缺点,但随着大规模集成电路的迅速发展,这些缺点已经被克服,液晶显示器件已经进入成熟阶段。其中超扭曲列向液晶显示器件在中小尺寸LCD领域占很大的市场,有其独特的优势。本文讨论了一种功能较完备较复杂的带4种MPU接口的4级灰度128×129点阵STN LCD驱动控制芯片的设计。在设计中采用FRC/PWM相结合的灰度调制方式,通过设置灰度寄存器的值来调整灰度的深浅,使之符合所选择的LCM的最佳特性。同时在控制电路中上加入屏幕的部分显示、交流驱动、滚屏以及图像的硬件翻转等功能,并在设计中考虑了显示效果的提高。根据“自顶向下”的设计思想,将芯片进行层次化功能划分,同时,参考已有的同类驱动芯片的设计经验,结合“自底向上”的原理图输入设计方法对部分模块进行设计,最后根据系统设计的框架对各模块进行协调设计,并进行芯片的整体功能验证,从而达到设计的目的。本文按照ASIC的设计流程,首先详细介绍了灰度STN LCD驱动控制芯片的系统设计和规范定义; 随后就灰度STN LCD专用驱控制芯片的关键模块电路:MPU接口电路、时序控制电路、SRAM、驱动电路、电源电路的进行verilog HDL描述、逻辑综合或者原理图输入,从而完成芯片的前端设计; 最终确定采用Chartered的0.35μm CMOS高压工艺顺利完成了芯片版图设计以及后仿真,进而完成芯片的全部设计。更多还原

【Abstract】 Recently liquid crystal display (LCD) becomes very popular in flat-panel displays for its low power, mini bulk, ingenious appearance and cheap cost. Although a more complex driven circuit and a more difficult interface with SCM, the design of LCD has developed gradually into a mature level with the rapid development of VLSI technology. Among them, Super Twisted Nematic (STN) LCD is applying in consumer and communication electronics widely. In this paper, the design of 4-level gray scale graphic dot-matrix (128×129), with Serial Peripheral Interface (SPI) and 8-bit parallel MPU interface, multi-function LCD driver and controller IC is demonstrated. It used the method of PWM and FRC to generate adjustable gray levels, which can be adjusted to accord with the characteristic of the LCM best by changing the values of the gray palette register. The function of partial display, screen scrolling, page switching and hardware picture reversion is added to the design. Finally the improvement of display effect is taken into account. Based on the “Top-to-down” methodology, the hierarchy partition from top behavioral level to bottom functional blocks had been framed. Meanwhile, the direct schematic design of some subcircuits had also been conducted in reference to other function-like circuits, using the “Bottom-to-up” methodology. Then, the whole chip simulation and verification were conducted to examine the matching between the design and the requirements of specification. According to the ASIC design flew, the top-level architecture and specification of the whole design of this dot-matrix LCD controller/driver chip were discribed first, then the paper put emphasis on the design of some critical blocks, such as interface block, timing and control block, SRAM, driver block and power block. When circuit design and function verification had been finished, the physical design in Chartered 0.35 μm CMOS High Voltage process and post-layout verification were accomplished subsequently.更多还原