【作者】 宋萍；

【导师】 李正佳；

【作者基本信息】 华中科技大学 ， 物理电子学， 2006， 硕士

【摘要】 硅基液晶(LCoS)是一种新型的微显示技术,以其高分辨率、高亮度和低成本的优势在微显示领域有很广阔的发展前景。本课题针对现有硅基液晶LCoS光源功耗大、对比度低、寿命短、且需强风散热等技术瓶颈,将超高亮度彩色发光二极管(LED)作为新型光源应用于LCoS微显示器,设计了一种专用的LED驱动电路,该LED光源具有高对比度、高亮度、长寿命、紧凑型的特点,可广泛用于各种投影系统、高清晰度电视等,具有广阔的市场前景。本文介绍了超高亮度LED的结构、发光机理及国内外研究状况;阐述了微显示技术的研究概况及目前主流的LCoS光学引擎的架构特点;分析了新型光学引擎架构中各部分的组成及该架构的优点;给出了LED驱动电路的总体设计方案。本文从超高亮度LED特性的角度分析了各种驱动方法的原理,设计了LED线性驱动电路;分析了脉宽调制信号动态调节LED亮度的原理,设计了单片机控制电路;分析了新型热管散热技术,解决了超高亮度LED的散热问题;并通过Visual Basic开发应用程序对LED驱动电路进行串行通信控制。本文给出了驱动电路各组成部分的设计电路图及PCB电路板的实物图,单片机及Visual Basic程序设计;对超高亮度LED工作状态下的电流及温度进行了测试,实验测得LED工作最大电流达到8A,温度控制在60 oC以下,均达到了设计的要求。更多还原

【Abstract】 LCoS is a promising technology for using in micro display by bringing high resolution, high brightness and low cost to customer. Our project will propose a new driving circuit of high-bright colorful LED source applied in LCoS micro-display system for the purpose of resolving the problems of lower contrast, shorter durability, higher power consumption, complex heat structure caused by traditional source. The high-bright LED source can be used in lots of projection systems and high definition TV because of its high contrast, high bright, long durability which will bring a wide market to this optical engine.At first, the structure, optical principle and main stream of high-bright LED were introduced. The micro display technology and LCoS optical engine were studied. The components that make up the system and the merits brought by the new structure were analyzed. The total design project of LED driving circuit was exposed.The principle of several driving method at the point of high-bright LED’s performance was analyzed, of which linear driving circuit was designed. The principle of PWM signals adjusting LED bright was analyzed, and the controlling circuit of MCU was designed. A new type of heat pipe radiator was analyzed, and the thermal problem of high-bright LED was solved. The LED driving circuit was controlled with serial communication by developing application program in Visual Basic.At last, the circuit diagram and PCB board of driving circuit were exposed, and the MCU circuit and application program by Visual Basic were carried out. The high-bright LED’s current and temperature were tested when working. The results of the experiments showed that LED’s max current is 8A, the temperature is controlled below 60oC, which proved our design.更多还原