Lcd Vs Plasma Hdtv

Lcd vs plasma Hdtv - which is best? If you're looking for a flat-screen, slim and sexy display, to watch Hdtv, you have a option of two technologies, Lcd and gas plasma.

Each has benefits and disadvantages and so each is more standard in exact
circumstances.

LCD HDTV

Historically, the Lcd vs plasma Hdtv option has been fairly simple. If you wanted a
flat-screen that was about 40in or bigger, you had to choose plasma, otherwise you
should choose Lcd. However, as Lcd technology improves, Lcd Hdtvs are getting
bigger and most of the major manufacturers expect the whole of Lcds they
produce to grow steadily over the next few years while the whole of plasmas will
decrease. However, if you're looking for a flatscreen Tv today, plasma still has a lot
to offer.

Lcd Vs Plasma Hdtv

To understand the Lcd vs plasma Hdtv question, we need to look at the way the
two technologies work.

Lcd

Lcd Hdtvs work by shining a light behind an Lcd panel made up of a fixed whole
of pixels. Each pixel is whether red, blue or green and is switched on or off when a
voltage is applied to it. When voltage is applied to a pixel, it is switched off,
meaning that light can't shine through it.

The main advantage of Lcd vs plasma Hdtv is that Lcd panels don't suffer from
what's called burn-in. This is a highlight of plasma Tvs where they are used to watch
Tv stations with logos constantly displayed on-screen or where they are used for
video gaming with games that have static images such as a cockpit on flight
simulators. The image precisely 'burns-in' the screen meaning that even when the
image is not gift you can still see a faint trace of it on screen. So for video
gamers in particular, Lcd is a great option than plasma.

Plasma

Plasma Hdtvs have over a million chambers which house one or a combination of
gasses. When a voltage is applied to one of these chambers the gas ionizes and
emits ultra-violet light. This light strikes red, green or plue phophors coated on the
inside of the room and a pixel emits this color light.

Plasma Hdtvs tend to have great contrast than Lcds because, even when a pixel
on an Lcd panel is switched off it doesn't block all the light coming through and
therefore the pixel isn't wholly black. Plasma Hdtvs also tend to have a wider
viewing angle than Lcds, as on Lcd Hdtvs the contrast and colour of the image can
change when the screen is viewed from different angles.

Lcd vs Plasma Hdtv conclusion

Technology is changing rapidly, but for now (July 2004) it's still true to say that at
sizes of 40in and above, plasma offers a less-expensive and generally great
solution. For screen-sizes less than 40in Lcd is better. However, as Lcd technology
improves and prices fall, this will change.

Lcd Vs Plasma Hdtv

Hdtv Enters the Fourth dimension - 120Hz Frame Rates

There's a lot of talk these days about frame rates in the new Hdtvs. The frame rate is plainly the amount of obvious images a Tv screen can display in a second, and is also known as the display rate or "Hertz". Hertz is the scientific unit for cycles per second, and is abbreviated "Hz". The most recent buzzword is "120Hz", which means a display rate of 120 frames per second. This is twice as fast as most Hdtvs are capable of (60Hz), so it ought to make the inspiring pictures look smoother. But, the human eye can only process about 20 to 25 obvious images per second, so why should it matter what the frame rate is, as long as it is faster than your eyes can see?

The write back comes when you comprehend that not all video is filmed at the same rate. Movies are commonly filmed at a rate of 24 Hz, most Tv is filmed at 30 Hz, and some sports events are now being filmed at 60 Hz.

LCD HDTV

Some simple math will show the qoute and delineate the solution. When a Tv set wants to display 60 frames per second, and the cable Tv firm sends it 30 frames per second, that's easy to deal with: the Tv shows each frame twice in a row, creating an image made up of two consecutive frames. Each image will last exactly 1/30th of a second on the screen, and things will look perfectly smooth.

Hdtv Enters the Fourth dimension - 120Hz Frame Rates

So what happens when your Dvd player sends 24 frames per second to the Tv, but the Tv still wants to show 60 on the screen? This is a little slower than the cable Tv frame rate, so if it plainly shows each frame twice and then waits for the next one, there will be a black gap in between and the movie will look terrible. So, the Tv needs to triple one frame, double the next, triple the following one, and so on, giving it a total of 60 frames to show each second. This is known as 3:2 Pulldown.

The 3:2 Pulldown trick works Ok, but there is a problem. One image lasts a 20th of a second, then the next lasts a 30th. A 20th of a second is long sufficient for most people to tell that it's certainly a static image, and when the camera pans colse to in a scene, things will seem to move unevenly. But if your Tv is able to display 120 frames per second, it can take the 24 Hz input and plainly show each frame 5 times in a row for a total of 1/24 (or 5/120) second per frame, with no discrepancy from frame to frame. And when 30Hz video comes in, it displays each frame 4 times in a row, for a total of 1/30 (or 4/120) second per frame. qoute solved.

Now that frame rates are fast sufficient to display any kind of input smoothly, Hdtvs not only have high resolution in the x and y (height and width) dimensions, but also in the t (time) dimension. As in all kinds of digital media, higher resolution means smaller units of data, and that means a more lifelike pregnancy of reality. The 120Hz frame rate won't be very tasteless until 2008, but a few Hdtvs already have it, like the Sony Bravia Xbr4 series and the Sharp Aquos 92U series.

Hdtv has certainly entered the fourth size (time), but has skipped the third (depth) in the process. Until we see start looking holographic movies on Dvd, we'll have to wait for true four-dimensional Tv.

Hdtv Enters the Fourth dimension - 120Hz Frame Rates