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With the integration of telecine, more and more films have been put on television screens. This brings up a problem. How to crop the movie screen for TV display? Letterbox is a popular way to display wide-screen movies on a 4:3 screen. In Letterbox mode, all the original scenes of the movie are preserved, and unused parts of the TV screen are filled with black bars. In movie theaters, the effects and visual impact of wide-screen movies are unquestionable. But when you put a wide-screen movie on your TV and the whole picture is displayed, the top and bottom of the TV screen is bound to be wasted. 
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Applications can be easily downloaded using a sofa butler, but often see some friends complain about "how can I not full screen TV?", Of course, this does not rule out the possibility of full screen due to software bugs, but in most cases it is because of improper settings, resulting in the display Disproportionate. It is also important to emphasize that not all programs are suitable for full-screen viewing.
Let's first understand some of the knowledge of the lower picture ratio.
The ratio of the width and height of a picture is generally referred to as Aspect Ratio (also called aspect ratio or just picture ratio). The earliest televisions used the aspect ratio of the movie, which was a standard of 1.33:1. That is, the width of the movie screen is 1.33 times the height. This ratio is sometimes expressed as 4:3, which means that the width is 4 units and the height is 3 units. This aspect ratio was later accepted by the Academy of Motion Picture Arts and Sciences and is called the Academy Standard.
The film industry has a variety of aspect ratio formats, but there are two "standard" proportions that dominate the position: Academy Flat (1.85:1) and Anamorphic Scope (2.35:1).
With the development of high-definition digital television, 16:9 (1.78:1) is defined as the aspect ratio of the international standard for high-definition television, used in Australia, Japan, Canada and the United States, as well as European satellite television and some non- HD Widescreen TV (EDTV) PAL-plus. More and more 16:9 LCD flat-panel TVs are entering the home and are gradually replacing traditional 4:3 TVs. This ratio is very close to the 1.85:1 widescreen of the college, so it also solves the problem of displaying widescreen black borders on the 4:3 screen, leaving only a black border. For the 2.35:1 movie, there will be more black bars up and down, and the traditional 4:3 picture will have black bars to the right and left.
After understanding the knowledge of the aspect ratio, we look at how to set up to display the correct scale on TV. Flat screen televisions are provided with the function of switching the screen ratio. Here the XTV Air as an example, other models of television are also very similar.
The X50 air is a 4K smart TV. Compared with the traditional flat TV, the ratio setting will be more complicated. We look at several situations.
· External signal input
First of all, confirm the signal format input to the TV. Here is an example of a high-definition output from Coship HD set-top box N8606 HDMI 1080i@60Hz. Appearance ratio select "full screen" or "adaptive". When watching high-definition television programs, the screen is full of borders. If SD programs are selected, the set-top box will add black borders on both sides of the horizontal direction. The following viewing mode is unclear and useful. It seems to be related to 3D. Keeping the default value for the time being ignores it.
X50 air Press the "Menu" button to call up the screen scale setting menu. There are several modes of "full screen", "default", "16:9", "4:3" or "point to point". It is recommended to use "point-to-point" mode to match the format of the front-end signal source.
· Carousel
In this mode, the interface from which the “Menu†key comes out is different from the above one. You need to select “Menu†in this interface to display the screen ratio setting options.
· LeTV TV Version
Press the "Menu" button, the display interface is different from the previous one, select the middle item, you can adjust the screen ratio.
third-party usage
I believe many of my friends have installed many third-party video applications on Super TV. Although LeTV’s videos are quite numerous, some of the films that are not popular are not found, and there are also live broadcasts.
Basically these applications call out the aspect ratio setting item by operating the "Menu" button of the Super TV remote control. Below to familiar with the next few video applications settings interface.
The set-up interface of the Thai-Television video has several modes of "full screen", "standard", "16:9" and "4:3".
HDP live broadcast settings interface, the screen ratio has "full screen", "original", "16:9", "4:3" mode.
The all-aggregation setting interface has “original proportionâ€, “full screenâ€, “16:9â€, and “4:3†can be selected.
It is more convenient to set the screen ratio to "original ratio" under normal circumstances. The "full screen" and "16:9" modes will cause horizontal stretching and distortion for 4:3 content, which is not very comfortable. Therefore, the so-called "full screen" is not required under any circumstances, and the correct ratio of the screen is the correct solution.
In addition, there is another situation to be mentioned. When looking at some shows, sometimes full-length shows, sometimes with black and white sides, seems to have become 4:3 mode. This is more obvious in news programs. When the host in the studio broadcasts the news, the footage is full, but the location shooting may be limited to 4:3 by the equipment, so the broadcast is filled with black borders on both sides. This situation is normal. It is not a problem with the TV. The black border is part of the signal.
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