Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 135 for “"Light emitting diode"”.
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White light emitting diode as liquid crystal display backlight
The discovery of high brightness (white) light emitting diode (LED) is considered as a real threat to the current lighting industry in various applications. One of the most promising sectors would be using white LED to replace the current Cold Cathode Fluorescent Light (CCFL) technology as the …
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Commercialization of Quantum Dot White Light Emitting Diode technology
… has the potential to substitute conventional lighting and revolutionize the lighting industry over the next 10 to 20 years. However, successful penetration of this extremely large lighting market would require vast improvements in power conversion efficiencies, color index, light output per …
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Effects of light-emitting diode photostimulation on burn wound healing
Annually, more than 1.2 million persons in the United States require medical care for burns. Healing of deep burn wounds requires restored perfusion and neoangiogenesis to reestablish blood flow and limit ischemic damage.\r\nWe propose that LED photostimulation, by inducing macrophage proliferation …
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A low power display architecture for organic light emitting diode microdisplays
Organic light-emitting diode (OLED) devices offer a very promising alternative to existing flat panel display technologies, such as liquid crystal displays (LCD) that currently dominate the market. OLED displays offer very attractive characteristics, including higher luminous, larger viewing angle, …
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Sunlight readability and luminance characteristics of light-emitting diode push button switches.
Lighted push button switches and indicators serve many purposes in cockpits, shipboard applications and military ground vehicles. The quality of lighting produced by switches is vital to operators' understanding of the information displayed. Utilizing LED technology in lighted switches has …
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Smart Textile Lighting/Display System and Future Quantum Dot Light Emitting Diode
… such as weaving and knitting. Smart lighting/display textile with multifunctional fibre devices has great potential in numerous areas, including lighting, display, smart home and Internet of Thing (IoT). This thesis first introduces the existing technology in textile engineering, …
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Development of monolithic CMOS-compatible visible light emitting diode arrays on silicon
… Si-based CMOS ICs and III-V-material-based light-emitting devices are very exciting and such integration has been an active area of research and development for quite some time now. SiGe virtual substrate technology presents one way to integrate these materials. A more practical approach to …
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The Design and Manufacture of a Light Emitting Diode Package for General Lighting
Lighting technologies have evolved over the years to become higher quality, more efficient sources of light. LEDs are poised to become the market standard for general lighting because they are the most power efficient form of lighting and do not contain hazardous materials. Unfortunately, LEDs pose …
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Optimization of a light emitting diode based projection stereolithography system and its applications
The rapid manufacture of complex three-dimensional components has eluded researchers for decades. Several manufacturing options have been limited by either speed or the ability to fabricate true three-dimensional structures. Over the last decade, projection stereolithography has been developed to …
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Design and fabrication of a light emitting diode using a two-dimensional photonic crystal
… forbids the propagation of certain frequency light in one, two, and three dimensions. A two dimensional photonic crystal may be used to directly modify the spontaneous emission of a light-emitting diode by eliminating the coupling of light to guided modes. In this work, the design and …
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The Effect of Polarization and InGaN Quantum Well Shape in Multiple Quantum Well Light Emitting Diode Heterostructures
<p>Previous research in InGaN/GaN light emitting diodes (LEDs) employing semi-classical drift-diffusion models has used reduced polarization constants without much physical explanantion. This paper investigates possible physical explanations for this effective polarization reduction in InGaN LEDs …
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Beam profile characterization of light-emitting-diode curing units and its effect on polymerization of a resin-matrix composite
… localized irradiance beam profiles from multiple light-emitting-diode (LED) light-curing units (LCUs) on the polymerization pattern within a resin-matrix composite (RMC). Irradiance beam profiles were generated from one quartz-tungsten-halogen and various single and multiple emission peak LED LCUs …
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The Rich Chemistry of Cyclotriveratrylene (CTV) And CT-Inspired Reactions: Anthracenes with Organic Light-Emitting Diode (OLED) Applications and the Discovery of Cascade Reactions
… that are useful for the construction of organic light-emitting diodes (OLEDs). Several diaryl anthracene derivatives have been synthesized and analyzed, and were found to have excellent electroluminescent properties, including one analog that exhibits an exceptionally high quantum yield. Red, …
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Study of the Effect of Light Emitting Diode (LED) on the Optimum Window-to-Wall Ratio and Whole-Building Energy Consumption in Open Offices
Daylight harvesting is an essential strategy that is often used to enhance both the design and performance of an architectural project. Windows, as crucial architectural elements, not only admit natural light into spaces but also provide the occupants with visual connections. However, the excessive …
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Evaluation of multiple and single emission peak light emitting diode light curing units effect on the degree of conversion and microhardness of resin-based pit and fissure sealant
… objective was to assess a multiple emission peak light-emitting-diode (LED) light-curing unit (LCU) by measuring the polymerization efficiency through the degree of conversion (DC) and Knoop microhardness (KHN) of a resin-based pit and fissure sealant at various light curing times and two …
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High Efficiency SEPIC Converter For High Brightness Light Emitting Diodes (LEDs) System
… the characteristics of and driving methods for light emitting diode (LED) lamp system. A comprehensive overview on the lighting development is proposed. The characteristic of the light emitting diode (LED) lamp is described and the requirements of the ballast for the light emitting diode (LED) …
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Growth of Gallium Nitride-Based Nitride Semiconductors by PAMBE for Development of Optoelectronic and Microelectronic Devices
Several devices, i.e., homo junction light-emitting diode (HJ LED), multi-quantum well (MQW) LED, and buried gate junction field effect transistor (BGJFET), are fabricated by PAMBE and their characteristics are demonstrated to show the high quality of GaN-based nitride films grown by PAMBE.
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