Introduction Of Led Tv

By Author: sudarshan singh
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The first thing to know is that LED TVs are just expensive LCD-based TVs with fancy backlights. Of course, it gets a lot more complicated than that see LED TVs

LED TV displays are not an entirely new technology, but a variation on LCD displays, which otherwise feature fluorescent-type backlights. Thus, LED TV screens are, to the surprise of many, still LCD TVs. They’re just part of the evolution and improvement in existing LCD technology.

The LED has become a pivotal illumination technology with a wide variety of applications. Since their initial invention, LEDs have been used in many diverse applications such as watches, calculators, remote controls, indicator lights, and backlights for many common gadgets and household devices. The technology is advancing at a rapid pace and new applications continue to emerge as the brightness and efficiency of LEDs increase.

From the early 1900s, scientists have been discovering ways to generate light from various materials. In 1907, Henry Joseph Round discovered that light could be generated from a sample of Silicon Carbide. For the next 51 years, scientists continued ...
... to discover the light emitting properties that exist with some compounds. In the 1950s, studies around the properties of Gallium Arsenide paved the way for the first official LED discoveries that soon followed

the P-type material. When the high energy electrons fall into these holes, they lose some of their energy which results in the generation of photons. The materials used for the P-type and N-type layers along with the size of the gap between them determine the wavelength and overall energy level of the light that is produced.
Many materials have been developed for manufacturing LEDs. Aluminum-Gallium-Arsenide, Aluminum-Indium-Gallium-Phosphide (AlInGaP), and Indium-Gallium-Nitride (InGaN) are commonly used for present LED architectures. “AlInGaP” is typically used for Red and Yellow dies while “InGaN” is used for Blue and Green. These materials efficiently produce photons that have wavelengths in the visible spectrum. These materials in combination with new manufacturing architectures have enabled the production of very bright LEDs that are beginning to find their way into general lighting and automotive applications. Some architectures have begun utilizing additional phosphor compounds to generate white light and are now beginning to compete with common incandescent and fluorescent lighting - with much lower power and much longer lifetimes.

The worldwide production of LEDs has risen to about 4 billion units per month. Manufacturing in Taiwan, Japan, and the U.S. comprises the most significant volumes with Taiwan leading with about one half of that volume overall. Much of the manufacturing involves the packaging of the LED die with a limited number of manufacturers creating the actual LED die material. Figure 1 illustrates the market size for low brightness and high brightness

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