LED大屏显示驱动芯片及控制系统的分析与设计

发布时间：2018-06-24 05:01

本文选题：LED + 大屏显示　；参考：《电子科技大学》2010年硕士论文

【摘要】： 随着信息技术的不断发展,人们对各种大屏显示的要求越来越高,LED大屏显示经过几十年的发展,从单色显示经双色显示发展到如今的全彩色,它已经广泛应用于电信、邮政、金融、交通、体育场馆和户外广告等各个行业。LED显示屏的发展离不开其驱动芯片和控制系统的同时发展。通过改良驱动电路结合控制系统可以获得更好的显示效果,可以满足各种场合的应用要求。目前,LED显示屏专用驱动芯片生产厂家主要有TOSHIBA(东芝)、TI(德州仪器)、SONY(索尼)、MBI(聚积科技)和SITI(点晶科技)等。本文设计了一种16通道LED恒流驱动控制芯片。设计采用0.35um混合信号CMOS工艺,输入电压范围3～5.5V,各通道输出电流范围为5～90mA,且输出电流大小可调。芯片各输出端拥有典型值为1%的各通道间的电流匹配精度。它相比以往常用的16通道LED恒流驱动器,有更优的输出电流调节精度以及更高的电流匹配精度,同时还拥有较小的芯片面积,在工业生产中可以极大提高芯片产量并大大降低单位芯片的生产成本。此芯片采用正向设计的方法和流程,包括课题论证、电路功能确定、电路性能指标的确定、部分电路的设计与仿真。本文重点介绍了其中主要模拟电路模块的设计与仿真,如基准电压源、输出模块、SRAM等,并给出重要子电路参数的仿真波形。基于LED大屏显示系统和驱动芯片,而设计了的控制模块,并在附录一给出了控制用SDRAM的代码实现方式。
[Abstract]:With the continuous development of information technology, people are demanding more and more large screen display. After decades of development, from monochrome display to full color display, it has been widely used in telecommunications, postal services, etc. The development of LED display screen is inseparable from the development of driver chip and control system. The improved drive circuit combined with the control system can obtain better display effect and meet the requirements of various applications. At present, the main manufacturers of special drive chip for LED display are Toshiba (Toshiba), TI (Texas Instruments), Sony (Sony), MBI (accumulation Technology) and siti (Point Crystal Technology), etc. In this paper, a 16-channel LED constant current drive and control chip is designed. The 0.35um mixed-signal CMOS process is used. The input voltage range is 3? 5. 5 V, the output current range of each channel is 5? 90 Ma, and the output current is adjustable. Each output of the chip has the current matching accuracy between the channels with a typical value of 1%. Compared with the 16-channel LED constant current driver, it has better output current regulation accuracy and higher current matching accuracy, and also has a smaller chip area. In industrial production, the chip output can be greatly increased and the production cost per unit chip can be greatly reduced. This chip adopts the method and flow of forward design, including subject demonstration, circuit function determination, circuit performance index determination, and part of circuit design and simulation. This paper mainly introduces the design and simulation of the main analog circuit modules, such as the reference voltage source, the output module SRAM and so on, and gives the simulation waveform of the important sub-circuit parameters. Based on LED large screen display system and driver chip, the control module is designed, and the code implementation mode of SDRAM for control is given in Appendix 1.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：TN873

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