mercredi 12 septembre 2012

LCD vs LED. Is the LED really worth the extra money?

By Andrew Perez


Have you ever found yourself strolling throughout the aisles of a Best buy or Fry's feeling extremely baffled as to what the differences are between the TV you're looking at and the one next to it. Have you ever tried to ask a sales rep regarding the differences, and got a poorly rehearsed irrelevant response? If you answered yes to any of these questions, then you've come to the right place. I am going to dig deep into what are the differences between an LCD and an LED HDTV. As soon as you are done absorbing the information in this post, you will be a complete expert on the subject. Then you can go back to the Fry's or Best buy you went to and show the salesmen a thing or two.

Don't get it mistaken; an LCD is an LED:

Before I dig into the details, let me clear something up on this whole TV discussion. An LED is the same as an LCD because both TVs use what's called liquid crystal display. This means that both HDTVs operate utilizing liquid crystal display flat panels to project their picture. The actual difference when comparing both TVs is the type of back lighting that each one uses. Besides that, there really is no such thing as a television that is LED only. So now that we've made things a little clearer, you can now start classifying both TVs as an LCD and an LED-LCD TV.

What kind of backlighting is there?

As I said earlier, the key difference between both TVs is the type of back lighting it uses. An LCD displays its picture with what is referred to as a cold cathode fluorescent lamp (ccfl) for background lighting. The fluorescent lamps use a plastic shield right in front of the censors to effectively administer its light. LED is short for light emitting diode, which is kind of similar to the lights you put on your house during Christmas, only quite smaller. This is where the whole debate between both TVs begins to make more sense when referring to the quality of the images. The LEDs are set up in rows and contrary to the LCD, it does not function using a plastic shield to distribute its lighting. The new LED models utilize precisely installed censors in the LED and in the crystal display to control the image being presented. These sensors are utilized to recognize the 1's and 0's data being sent out and adjust the color display pixel by pixel, so it is able to use the light more efficiently. A good way to look at it is to think of flip sunglasses. These sensors function in the similar way that flip sunglasses operate, only utilizing multiple types of shades. By using this kind of technology on an LED television, you are capable of experiencing much deeper blacks, smoother color and a more radiant picture. This is the reason an LED can display for you a much more lifelike picture. So whenever you are referring to the LCD vs LED debate, what you're actually comparing is LED back lighting vs fluorescent back lighting.

What does full backlit and edgelit mean?

There are generally two ways an LED television utilizes back lighting. Backlit and edgelit. The key benefit on the full backlit television is that it is used to increase the contrast levels by turning off and on the chosen LEDs and utilizing a function referred to as local-dimming. This boosts the total amount of blacks in particular areas of the image.

The edgelit's most obvious advantage is that it allows for the TV to be exceptionally slim, which makes the edgelit less heavy and simple to set up in your home or carry when needed. Contrary to the full backlit LED, the edgelit has its LEDs aligned along the edges rather than behind the panel. A handful of the most current edgelit televisions now have local dimming as well. Just remember to keep in mind that the edgelit presents fewer dimmable segments compared to the full backlit LED TV. The difference is obvious, a lot like comparing thousands to millions. To sum it all up the full backlit LED television can give you more definition in color and improved local dimming.

LED high definition televisions and local dimming:

Television sets have certainly come a long way since the old tube and analog times. All LED TVs that have the local dimming feature are effective in analyzing really dark parts of the picture. This allows more detail to be displayed on the darker scenes. Local dimming responds by turning off certain pixels, allowing you to obtain a significantly better contrast ratio and deeper levels of black. The pixels turn off and on suddenly as a result of what the ambient lighting is like. Think of it like when you are enjoying a good flick on your television with the sun rays beaming through your window, or the room light glaring right on your TV screen. The LED TV consciously modifies the attributes of your picture quality appropriately, so you are then able to keep seeing the picture on your LED screen uninterrupted. It is indeed a really nice feature to have I must say. LCD only televisions don't carry this option.

So is the LED TV really worth the money it costs?

To be frank, I actually don't think this argument is still current, since soon all TVs will be LEDs (LCD-LED). As technology progresses, LEDs keep getting significantly more high tech. LCD only TVs are yesterday's news and will pretty soon be obsolete. To sum it up for you, these are the key points to consider when buying and LED as opposed to an LCD. LEDs use less power, offer a much faster response time than fluorescent lighting, offer local dimming, are lighter, and offer overall better quality picture.




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