低功耗LED点阵显示技术的分析-物理电子学专业论文.docxVIP

华侨大学硕士学位论文：低功耗 华侨大学硕士学位论文：低功耗 LED 点阵显示技术的研究 IV IV Studied the luminescence Properties of white LED display screen. The forward voltage and the luminous intensity depend on the temperature linearly with constant injection currents. The properties of colorimetry changes and luminous colors always shift towards blue. According to the results, the best rated operating current of GaN-based white LEDs is discussed. Using capacitors as a current-limiting element, we designed a new LED lattice module. As of the low dielectric loss of capacitors, the power loss of circuit is very low. To achieve capacitance current-limiting two LED reverse parallel. LEDs is not only a light-emitting devices, but also a rectification component for its one direction conductivity. Designed a high efficiency LED driving mode of capacitance current-limiting and control circuitry to avoid a large number of power loss caused by current-limiting resistor. In order to obtain +5 V and-5V voltage, the design cleverly uses LCD driver IC CD4054B convert LED array signals of 74HC595’s output to -5V and +5V voltage, and through software designs with bipolar pulse driving signal of tunable pulse width. Theoretical calculations show that energy-saving effect of the new LED lattice driving circuit based on capacitance current-limiting is evident. When the single tube LED current is 6.8mA, the power dissipation of 16×16 LED lattice module is 0.156W, compared to conventional LED lattice driving circuit’s reduces 3.684W. V V Key words: LED Lattice, driving circuit of capacitance current-limiting, power loss, AVR MCU 2 2 1. 原创性声明论文使用权说明格式如下： 原创性声明 本人声明兹呈交的学位论文是本人在导师指导下完成的研究成果。 论文写作中不包含其他人已经发表或撰写过的研究内容，如参考他人或 集体的科研成果，均在论文中以明确的方式说明。本人依法享有和承担 由此论文所产生的权利和责任。 学位论文作者签名： 日期： 2.论文使用权说明格式如下： 学位论文版权使用授权声明 本人同意授权华侨大学有权保留并向国家机关或机构送交学位论文 和磁盘，允许学位论文被查阅和借阅。 论文作者签名： 指导教师签名： 签 名 日 期： 签 名 日 期： 华侨大学硕士学位论文：低功耗 华侨大学硕士学位论文：低功耗 LED 点阵显示技术的研究 PAGE PAGE 1 第一章 引言 1.1 LED 显示屏及其应用 LED 显示屏是上世纪八十年代后期在全球迅速发展起来的新型信息显示媒 体。它是多种技术综合应用的