Document Details

Document Type : Thesis 
Document Title :
Design and implementation of an RGB LED message board
تصميم و تشغيل لوحات الرسائل الإلكترونية باستخدام تقنية الدايود الضوئي الملون
 
Subject : Faculty of Engineering 
Document Language : Arabic 
Abstract : Variable Message Sign or VMS is the popular name of electronic message board. It has been spread worldwide when they decided to use a new technology called “ Red, Green, and Blue Light Emitting Diode” or RGB LED technology. This technology gives a chance to show pictures and even movies on large outdoor display which did not exist before. It was a long period of time between LED’s discovery by Henry J. Round (1907) and the decision to use it after discovering its commercial applications in the 1960s. Actually, the great characteristics of LED gave it the chance to be the suitable substitution for the classic light bulb in the old VMS. Some of these features are long lifetime, low power consumption, and its fast response. In the beginning, the goal was to show some electronic messages. So, the way to process the text was depending on choosing an already stored pattern that matches the text letter .Then, it rapidly improved to implement most of Latino and far-east languages fonts. Arabic calligraphy was not in consideration because it took much long time until the LED attracted the Arabian customer’s interest. Many implementation techniques were designed to implement this technology. Two techniques are the most popular, the dynamic mode which also called switching mode, and the static mode. The difference between the two techniques is huge by all standards, and include the design, color representation, size limitation, and the cost. Color patterns representation is the most difficult phase regarding the LED nonlinearity behavior. It is possible to overcome this difficulty by applying some correction algorithms which are designed to solve it. Gamma correction is the backbone for the correction process. It is implemented in software before applying it on the electronic circuit; but the electronic circuit itself needs to be redesigned. The electronic circuit which is responsible for controlling LEDs operation should be adjustable for the volt and current. Moreover, LEDs from the same color but having different wave lengths will increase the complexity of color correction and it is an impossible mission to obtain a homogenous outcome. 
Supervisor : Dr. Ali Muhammad Rushdi 
Thesis Type : Master Thesis 
Publishing Year : 1430 AH
2009 AD 
Co-Supervisor : Dr. Mohammed Shafeq Shikh 
Added Date : Sunday, January 17, 2010 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
عبد العزيز محمد الغامديAl-Ghamdi, Abdulaziz MuhammadResearcherMaster 

Files

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 24847.pdf pdf 

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