What is the Aspect Ratio? (4:3, 16:9, 21:9)
The aspect ratio is the proportion between the width and the height of a picture. It is often expressed in the W:H format, where W is the width and H the height. For example, a 16:9 aspect ratio means that for a width of 16 units, the height must be 9 units.
|4:3||1.33:1||Standard Channels||Old TVs|
|16:9||1.77:1||HD Channels||The majority of HDTVs|
|21:9||2.35:1||Most movies||Very few TVs|
Most televisions and computer monitors currently available have an aspect ratio of 16:9, which fits perfectly the high definition television shows. However, movies are usually filmed with a ratio of 21:9, which will results in black bars at the top and bottom of the picture. To fix this, some manufacturers are producing televisions with a 21:9 format. The table shows the most common aspect ratios.
What does black bars looks like on different aspect ratio TVs?
The position and size of black bars on your television depends on two factors: the aspect ratio of your television and the aspect ratio of the video you are watching. Any mismatch between the two will be filled by the black color. This practice is called letterboxing. The following picture shows the black bars for different televisions and aspect ratios (4:3, 16:9 and 21:9). All televisions have the same diagonal length.
As you can see, when you watch a 21:9 movie on a normal 16:9 widescreen TV, you will have some black bars at the top and bottom. This is represented by the top center TV in the illustration.
Is a 21:9 TV Worth It?
TVs with a 21:9 aspect ratio are rare. A 21:9 TV is only worth it if you watch almost exclusively movies (more than 80% of the time). If you watch a normal 16:9 content (like a HDTV channel) on it, you will see black bars on the sides. This reduces the viewing area for 16:9 content considerably. A 58" 21:9 television correspond to the same viewing area of a 47" for 16:9 content, as you can see in the illustration.
The most common aspect ratio of TVs and monitors is currently 16:9, which also correspond to the aspect ratio of TV shows. However, movies usually have an aspect ratio of 21:9, which will result in black bars above and below the picture if you watch it on your 16:9 screen.
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