ENTC Final (LCD, Semiconductor, Nanotechnology)2023 passed

ENTC Final (LCD, Semiconductor, Nanotechnology)Most liquid crystals (LC) are _____________ organic molecules on the order of 2.5 nm having properties of both solid and liquid - correct answer rod-shape The thing that will affect the behavior of liquid crystals: _____________ (for the applications of LCD monitor & TV - correct answer electric current In nematic LC for LCD display, light is blocked and ___________ is applied to LC - correct answer voltage In twisted nematic LC for LCD display, TNLC guides the polarization of light and ___________ is applied - correct answer no voltage LED (light emitting diode) is a _______________ alloy device - correct answer semiconductor a ___________ is an electrical device made of semiconductor materials which allows the electric current to flow through it in only one direction - correct answer diode a diode is an electrical device made of semiconductor materials which allows the electric current to flow through it in only ______________________ - correct answer one direction __________ (pure) semiconductors are pure, elemental semiconductors in which the number of free electrons is equal to the number of holes - correct answer intrinsic P-N Junction forms a depletion region or ________. - correct answer barrier Semiconductor _______________ forms a diode which allows electric current flow in only one specific direction - correct answer P-N Junction LED Chip Materials: InGaN, GaAsP, GaP, GaN, AlGaInP, GaAlAs _______________ - correct answer III-V family OLED Display - ___________ (no backlight is required) - correct answer self-illuminating optical fibers are extremely high ________________________ - correct answer purity silica glass a single optical fiber consists of: - correct answer core cladding buffer coating core of optical fiber - correct answer thin glass center of fiber where the light travels light speed = slower cladding of optical fiber - correct answer outer optical material surrounding the core that reflects the light back into the core light speed = faster buffer coating of optical fiber - correct answer plastic or silicone coating that protects the fiber from damage and moisture two types of optical fibers - correct answer single mode