Tron05 said:
120 hz is for NTSC signals(60hz for NTSC)
100hz for PAL signal(50hz for PAL/SECAM)
so in india you would only find 50hz/100hz..
All TVs today, particularly, digital TVs can play both NTSC and PAL. And it is true that NTSC has a higher framerate and thus needs faster screen refreshing. At the same time, you can play NTSC signals in India, particularly from DVD Players. So if LG chooses to sell only 100MHz in India, it has to do more with company policy than anything else.
ViniciusFarias said:
Re: LG - Scarlet 42LG60FR
And what about the resolution issue? Why the image don´t occupy the full screen, if the both the signal input (DVD) and the TV are 16:9?
Vini, there are three factors in the delivery of an image. One is the TV. The second is the source - DVD player or a TV transmission. The third and very important factor is the original source format, or what some call software or media.
For a long time, TV screens were square where the height and width were nearly the same. This is called 4:3 format, or standard TV shape. Here the width is just 1.33 times the height. This is called aspect ratio.
In the days of the old movies, film was shot and projected on 35mm which also had a similar aspect ratio. So if you take a 35mm mvoie and display it on a standard screen, it will occupy the full screen.
As time went by, Hollywood producers wanted to immerse it's audience in a larger screen, and what is called widescreen became popular. This is known by different names including 70mm, scope, widescreen etc.
When digital TV came about, watching movies at home had become popular. If you take a widescreen movie and display it on a standard TV, nearly 45% of the images on both sides (or 22.5% on each) side had to be chopped off to fit the screen. If you want to display the full width, you have to proportionally squeeze the picture from all sides. When you do this, the image will occupy some 70% of the screen in the middle. In other words, there will be blank areas (or black bars) on all four sides.
So TV makers started manufacturing digital TVs that were wider than a standard TV. The new ratio was 1.78 times wider than the height. This is also called 16:9. They could no dupliacte the aspect rations of a film form multiple reasons. Most important is that the TV has to display both film and digital TV material. So a compromise aspect ratio was arrived.
When you use a TV you see two kinds of images. One is a TV program that is shot with a digital camera. The other is a movie that is shot with a film reel. Images that are shot by a digital camera can be stored on the disc in anamorphic form, meaning the picture is squeezed horizontally to fit the standard 4:3 rectangle, then unsqueezed during playback.
Things with film are different. Most movies today have an aspect ratio of 1.66, 1.85 ("flat"), or 2.40
("scope"). Since these don't match 1.33 or 1.78 TV shapes, two processes are employed to make various movie images fit the digital TV.
One is Letterbox where the image is presented in its theatrical aspect ratio, which is wider than both standard and widescreen TV. Black bars, called mattes, are used to cover the gaps at the top and bottom. A 1.85 movie that has been letterboxed for 1.33 display has thinner mattes than a 2.4 movie letterboxed to 1.33 (28% of display height vs. 44%), although the former are about the same thickness as those of a 2.4 movie letterboxed to 1.78 (26% of display height). The mattes used to letterbox a 1.85 movie for 1.78 display are so thin (2%) that they're hidden by the overscan of most widescreen TVs. Some movies, especially animated features and European films, have an aspect ratio of 1.66, which can be letterboxed for 1.33 display or sideboxed for 1.78 display.
The other method is called Pan & Scan. Here the thinner TV "window" is panned and zoomed across the wider movie picture, chopping off the sides. However, most movies today are shot soft matte, which means a full 1.33 aspect film frame is used. The cinematographer has two sets of frame marks in his viewfinder, one for 1.33 and one for 1.85, so he can allow for both formats. The top and bottom are masked off in the theater, but when the film is transferred to video the full 1.33 frame can be used in the pan & scan process. Pan & scan is primarily used for 1.33 formatting, not for 1.78 formatting, since widescreen fans prefer that letterboxing be used to preserve the theatrical effect.
Thus even if your TV and DVD Player support 16:9, the source material that is converted from a movie will be using a letter box or a pan and scan, where there will be black bars on the sides or on top and bottom. Most movies you see on a digital display will use 16:9 widescreen ratio. In other, words they will use the full width of your screen but not the full height. If you take a film like that and try to stretch it, it will be like seeing it reflected in a concave or convex mirror. Your favourite heroine will have a much fatter backside than what she really has or what you like, or it will look as if she has been squeezed from both sides.
Cheers