Engineering
Take apart your laptop screen, and at its heart you'll find a plate patterned with pixels of red, green, and blue LEDs, arranged end to end like a meticulous Lite Brite display. When electrically powered, the LEDs together ...
Feb 1, 2023
1
83
Electronics & Semiconductors
Purdue University researchers have created transparent organic conductors from patent-pending polymers that achieve the same results and properties as traditional conductors made from rare-earth minerals but are less expensive ...
Apr 24, 2023
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1295
Engineering
Imagine a world where smartphones, laptops, wearables, and other electronics are powered without batteries. Researchers from MIT and elsewhere have taken a step in that direction, with the first fully flexible device that ...
Jan 28, 2019
2
1207
Electronics & Semiconductors
Next-generation electronics will feature smaller and more powerful components that require new solutions for cooling. A new thermoelectric cooler developed by Penn State scientists greatly improves the cooling power and efficiency ...
Jul 14, 2023
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240
Hardware
Semiconductors are the heart of almost every electronic device. Without semiconductors, our computers would not be able to process and retain data; and LED (light-emitting diode) lightbulbs would lose their ability to shine.
Sep 28, 2023
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47
Internet
When it comes to efficiency and quality, light-emitting diodes (LED) are the MVP of today's lighting technology. A team of Chinese researchers are using recent LED improvements as a springboard to launch a more interconnected ...
Jan 13, 2023
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58
Electronics & Semiconductors
Researchers have developed next-generation smart textiles—incorporating LEDs, sensors, energy harvesting, and storage—that can be produced inexpensively, in any shape or size, using the same machines used to make the ...
Apr 21, 2023
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134
Engineering
(Tech Xplore)—Researchers have fabricated a large-area textile that emits bright yellow light for more than 180 hours. The low-cost, flexible, transparent textile has potential applications in light-emitting clothing, signs, ...
Engineering
Chances are, the screen you're reading from glows thanks to light-emitting diodes—commonly known as LEDs. This widespread technology provides energy-efficient indoor lighting and increasingly illuminates our computer monitors, ...
Aug 2, 2023
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59
Hi Tech & Innovation
With all the new-version features and form-factor advances in smartphones, a common problem still remains, and that is power. Displays place a strain on battery life. Advances in the Organic Light Emitting Diode (OLED) screen ...
In electronics, a diode is a two-terminal device (thermionic diodes may also have one or two ancillary terminals for a heater).
Diodes have two active electrodes between which the signal of interest may flow, and most are used for their unidirectional electric current property. The varicap diode is used as an electrically adjustable capacitor.
The unidirectionality most diodes exhibit is sometimes generically called the rectifying property. The most common function of a diode is to allow an electric current in one direction (called the forward biased condition) and to block the current in the opposite direction (the reverse biased condition). Thus, the diode can be thought of as an electronic version of a check valve.
Real diodes do not display such a perfect on-off directionality but have a more complex non-linear electrical characteristic, which depends on the particular type of diode technology. Diodes also have many other functions in which they are not designed to operate in this on-off manner.
Early diodes included “cat’s whisker” crystals and vacuum tube devices (also called thermionic valves). Today most diodes are made of silicon, but other semiconductors such a germanium are sometimes used.
This text uses material from Wikipedia, licensed under CC BY-SA
