| Vs can be broadly categorised into two main types. It | | | | poor contrast ratio compared to that of a plasma TV, |
| is important that you understand these differences as | | | | and so this method of backlighting is aimed at |
| it can affect the performance of the television - and | | | | addressing this problem. |
| so may affect the one that you buy. | | | | As ever with all of this technology, there is a downside |
| The differences are manly due to the way the | | | | to this idea. The problems occur when one block of |
| backlighting works, and we can categorize them as | | | | lights is covered by a light and a dark part of the |
| edge-lit and back-lit LED TVs. | | | | image. This will then have the same problems |
| In this article we shall discuss the advantages and | | | | associated with an LCD TV where the block cannot |
| disadvantages of the back-lit LED HDTV and think | | | | be switched of completely, and so it is impossible to |
| about how the way it is built affects its performance. | | | | get the black part completely dark. |
| All TVs of this type are lit by LED lights, which have | | | | There is a way to resolve this issue, and that would be |
| been shown to give some advantages over other | | | | to have one LED light for every pixel on the TV |
| types of lighting. Back-lit LED televisions have the LED | | | | screen - but the problem with this is that it would be |
| lights placed directly behind the screen, which is similar | | | | far to expensive to build a TV in this way and so they |
| the the way an LCD TV has it's lighting arranged. | | | | would be too expensive for most people to buy. |
| These LED lights are placed into blocks, and are | | | | However, with all things taken into account, this method |
| grouped together so that they can be controlled at the | | | | of building a back-lit LED HDTV does generally |
| same time. Therefore, each block has the ability to be | | | | produce a TV with a better picture than that of most |
| switched off and on separately to the other blocks | | | | LCD TVs. |
| around it. The advantage of this is that in an image | | | | Understanding the two different types of LED TVs |
| with some dark areas and some light areas, the dark | | | | that are available can be important when you are |
| parts can have their blocks switched of completely to | | | | looking to buy a new television. If you see how the |
| enable an completely black signal. | | | | different types can affect the performance of the TV, |
| This extra control isn't possible on an LCD television. | | | | then it may make a difference as to which one you |
| The name of this technique is local dimming, and this is | | | | buy. |
| the term you should be looking for if you want to buy | | | | It must be remembered however, that a backlit LED |
| an LED TV that is built in this way. The main | | | | HDTV also has some disadvantages when we |
| advantage is an LED HDTV with this type of | | | | compare with an edge-lit model. To find out more |
| technology may have a better contrast ratio than | | | | about these issues visit the link below where it is |
| other types of high-definition television. | | | | discussed in greater detail. |
| LCDs have always traditionally had a problem with a | | | | |