TV

Okay, you are either planning to upgrade your home theater tv or looking to start from scratch and you’re thinking television.

What do you consider? what brand is best? How much should you pay? Should you consider LCD or plasma? All pertinent questions and in this article we’ll give you three screens worth considering.

Sony

The Sony KDL40W3000 HD TV is a good performer with several excellent features. Home theater aside, this particular model is excellent for games users so bear this in mind when shopping for a tv.

There are plenty of features to consider with this model and depending where you shop, you could be expected to pay anywhere from $1600-$2500. This set features a high definition multimedia interface with PC connectivity. Apart from the brilliant color, this smart set also has the ability to adjust automatically the brightness levels in conjunction with the levels in the room.

One of our favorite features is the ability to use a screen freeze function for purposes such as gathering information before it disappears. It’s a typically well put together Sony product and well worth considering.

Samsung

Samsung have won a lot of friends with their 46 inch LNT4665F LCD HD model. One of the most notable aspects is it seems to have far better color than previous similar models.

This lightweight set has the performance output to match and one of it’s big features is a glossy screen and excellent contrast. With 3 HDMI inputs, plus two component video and PC input this set is not lacking in the feature department. This could stretch some budgets but at between $1800 and $3500 it is hard to beat.

Panasonic

In the world of plasma, Panasonic have the TH42PX75U 42 inch HD model which is an excellent buy particularly for those on a smaller budget. For $1000-$1400, this is one of the best value sets on the market.

One of it’s striking features is it’s amazing picture quality and if that’s your main benchmark (and why shouldn’t it be), in selecting a television then this shouldn’t let you down in that department. It has you covered in the sound department as well with a 20 watt speaker system which doesn’t skimp on power.

If Plasma is your interest then this is a tough set to go past. Choosing the right set is one of the toughest things to do when considering your home theater tv so spend a little time making your decision and the three sets listed a well worth investigating a little further.

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Driving an individual LED is a simple task and all you do is attach the LED through a current limiting resistor to a control line. When the control line goes high the LED lights up and when the control line goes low the LED is off. The problem is that if you try and drive an 8 by 8 matrix in this way you need 64 individual control lines and this would require a lot of circuitry.

The way round it is to cheat and make use of a property of your eye called persistence of vision.

Persistence of Vision

Your eye actually remembers what it has seen for a very short time i.e. The image in your eye persists for a short while. Television designers made use of this fact many years ago (and still do today) since the image created on a TV set consists of a single electron gun (actually three since there is one gun for each color).

Note: LCD TVs work in a different way.

The electron gun scans over the entire TV screen at an extremely high rate. It works by using electric fields to alter the direction of the stream of electrons (these electric fields are extremely high voltage which is why it’s important never to open up a TV). The stream of electrons is deflected so that each row is scanned one line at a time. At each pixel the gun is turned on make the screen phosphor light up.

As long as the entire screen is refreshed before your eye forgets the image it looks to you like the screen has a constant steady picture. If the refresh rate was reduced then you would begin to see the image flickering.

The rate at which the screen needs to refresh is 50Hz i.e. 20ms and this is the rate needed if you do multiplexing.

Multiplexing

To use persistence of vision in electronic designs you make use of a technique called multiplexing and it simply means sharing. Instead of driving each LED individually you can share a control line between several LEDs.

You only need to turn on a control line for a short time as long as you remember to repeat the output before the 20ms time limit.

Controlling the 8 by 8 LED matrix

An led dot matrix display is simply an array of LEDs arranged in a square grid. Each column is connected to one side of the led and each row is connected to the other.

The matrix is arranged specifically for multiplexing and you can actually get away with 8 column drivers and 8 row drivers so instead of 64 control lines you now only need 16 control lines i.e. A saving of 75%.

Note: This discussion is for the common cathode LED matrix i.e. Where the cathode (-ve) of each column of LEDs is connected together. The type of matrix determines whether you drive a row high or low to turn on an LED.

To turn on an individual LED in the matrix requires that you drive a row with a high voltage and allow current to flow through the cathode. You usually allow current to flow by attaching a transistor to a column connection and it’s turned on and off using a control signal.

When you turn on the column transistor driving any of the eight rows will light up one of the 8 row LEDs. To control the next column you turn off the 1st column transistor and turn on the next column transistor (out of the 8 available). Using the same row drivers you can now control this next set of 8 LEDs.

If you repeat this process ensuring that all columns and rows are driven over the period of 20ms then it will look as though the display is not flickering at all i.e. It will appear that the LEDs are continuously driven.

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When you are first introduced to the Samsung UN55B6000 you will be undoubtedly impressed by the set’s attractive cabinet. This HDTV supplies you with LED technologies housed inside a gorgeous black frame with touch of color embellishments. The set is thin, wide, and wall mountable or you can set up in your entertainment center or on a beautiful stand. Wherever you place the UN55B6000, you will find your viewing options are diverse and versatile: view images at a 178 degree angle in every direction without missing out on color and image distinctions.

What’s offered to you inside the Samsung UN55B6000? The Samsung UN55B6000 is equipped with x.v Color™ support, it has a V-chip inside its housing, and you get full parental controls. You also get an ultra clear panel with super anti glare features, excellent sound features and two fifteen watt speakers offering you surround sound effects of impeccable quality. The UN55B6000 is supported by energy efficient LED technologies, it is Energy Star® certified, it is DLNA compliant, and you get an ATSC, an NTSC, and a QAM tuner housed inside the device.

When you buy the UN55B6000 you will get:

A mini remote
A remote control
A stand and screws for assembly
Batteries for both remotes
Safety instructions, a user manual, and a warranty
The UN55B6000 body

The UN55B6000 gives you access to different screen sizes, different sound modes, and you can even select different Auto Motion Plus settings too. You get a 3 million to 1 contrast ratio, a gorgeous 54.6 inch wide display screen, and picture in picture options with this device as well. If you are seeking an affordable but highly functional LED television selection, the UN55B6000 is an ideal HDTV choice.

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