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Difference Between Plasma And Led TV
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When it comes to shopping for a High Definition Television [HDTV], shoppers ask themselves an important question! Should I go for a Plasma TV or an LED TV? What's the difference between plasma and led? What is the technological difference between plasma and led? If you are one of them, then, yes, you are on the right page. Today, I will talk exactly that.

Plasma TV.

Plasma TVs use a plasma display panel [PDP], and is a flat screen TV. It is usually used on large screen TVs. Behind the flat screen of the TV, there are millions of tiny dots, or technically called pixels or cells. Each cells have three sub cells within it, one sub cell will be coated with phosphor that glows red when photons strike, the other is coated with phosphor that glows green when photons strike and the last one is coated with phosphor that glows blue. These cells contain a mix of xenon and neon gases with a tiny amount of mercury. When an electrical charge is applied to the cells, the gas within each cell forms a plasma. While electric current flows through each cell, the loose electrons moving through the plasma, collides with the mercury molecules. This collision greatly spikes the energy of the molecules and the excess energy is diffused as ultraviolet photon. The phosphor coating inside the cells, when struck by the photons creates different colors of light. The color produced depends on the phosphor type coated inside the cells.

The cells we talked above are usually a teeny-weeny neon lamp, containing the gases and phosphor coatings. Depending on the video signal coming into the TV, these different colors orchestrate to create the all-embracing color of the cells and thereby form the whole colorful images on the screen.

Talking about the resolution, the plasma TVs today, usually has a typical native resolution of 1080p. Plasma TV resolution is not an important factor to the overall picture quality compared to other factors like contrast ratio. The top three important factors that govern the picture quality is contrast ratio, color saturation and color accuracy.

Here area some of the pros and cons of Plasma TV

Pros.

• Produces deeper blacks and therefore excellent contrast ratio.   Contrast ratio is the difference between the illuminated and darkest portions of   an image. Higher the contrast ratio, sharper the picture.

• High refresh rates and therefore less motion blur.    Refresh rate means the number of times in one second, the display draws the     data/image.    Motion blur means when showing moving images, the television has to draw     images in pixels, so quickly that the human eye cannot detect. If the refresh    rates are less, then the moving images will cause a blur.

• Viewing angle is much more wider than LCD.    In LCD, if you view your favorite programs or shows from an angle,    the picture degrades.

Cons.

• Screen burn. There are technological advancements to reduce    screen burns but still don’t prevent it.    when a non-moving image or text is displayed for a prolonged time, can create    permanent ghost-like image of these images or text.

• Power consumption is more than LCD-LED

• Can cause buzzing noise when used at high altitudes;   this is because of the pressure difference between the gases inside the cells   and air pressure at high altitudes.

LED TV.

Light emitting diodes [LED] are illuminated by the free movement of electrons through a semiconductor. LED is a semiconductor. Semiconductor means, a material, which has a varying ability to conduct electricity. The material used to construct LED is aluminum-gallium-arsenide.

LED TV is in fact just an LCD TV, which uses light emitting diodes [LED] as the light source to light up the screen, unlike LCD TVs, which use Cold Cathode Fluorescent Lamps [CCFL]. An LED is basically a teeny-weeny light bulb. Unlike the regular light bulbs, it doesn’t have a filament to burn out. LEDs have a really long life span compared to a regular light bulb or fluorescent lamps. This is one of the main differences between Plasma and LED TV.

LEDs can be laid in different configurations behind an LCD screen and uses either white LEDs or RGB [Red, Green, Blue].

Full Array LED TV. [With local dimming]

In this configuration, a full array of LEDs is arranged behind the entire screen. Certain zones of LED behind the screen can be locally dimmed or brightened. So if the picture on the TV demands certain areas to be  dark and other areas bright, the LEDs will be dimmed in dark areas of the picture and brightened in brighter areas of the picture. This results in an increased contrast ratio, and therefore sharp picture. Two types of LEDs are used in full array, White and RGD [Red, Green, Blue]. TVs with RGB LEDs are capable of a wider color range..

Pros. • Can produce deeper blacks and therefore higher contrast ratio and sharper picture than Edge-lit    models. Contrast ratio is the difference between the illuminated and darkest portions of an image. Higher the contrast ratio, sharper the picture.

Cons. • Slightly thicker than Edge-lit LED TVs

Edge-Lit LED TV. [With local dimming]

A very few hand select models are available in this model from Sony, Samsung and LG. Edge-Lit LED TVs have LEDs arranged along the four sides of the TV, instead of the entire screen. A special light guide is used to spread the light uniformly across the screen. In this model, local dimming is possible in certain zones of the screen without placing LEDs behind the screen. Picture is sharper than the Edge-lit  model without local dimming but not at par with full array models.

Pros. • Can produce deeper blacks and achieve higher contrast ratio than Edge-Lit models without    local dimming. Contrast ratio is the difference between the illuminated and darkest portions of an image. Higher the contrast ratio, sharper the picture.

• Thinner profile than full array model

Cons. • Picture is not as sharp as full array models.

 

Edge-Lit LED TV. [Without local dimming]

This model is same as Edge-Lit with local dimming except that local dimming is not is possible.

Pros. • Thinner design than full array models.

• Weighs less than full array models.

Cons. • Contrast ratio is not as good as full array, because local dimming is not possible.   Contrast ratio is the difference between the illuminated and darkest portions of an image. Higher the   contrast ratio, sharper the picture.

• Lighting may not be uniform across screen

In this article, we talked about the difference between Plasma and LED TV, the materials used in construction of each and the pros and cons. Hope the information provided will help you in your HDTV shopping.


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