Why is 2.35:1? Talking about the proportion of home theater projection screen

In the process of selecting a home theater projection screen and a projection unit to build a home theater, many friends don't know much about how to choose the screen size ratio of 4:3, 16:9, 1.33:1, 1.85:1, 2.35:1, etc. The following small series will explain, I hope to help you.

Why is 2.35:1? Talking about the proportion of home theater projection screen

From the end of the 19th century until the 1950s, the proportion of images in almost all movies was standard 1.33:1 (this ratio is sometimes expressed as 4:3). In the 1950s, the newly born television industry faced the problem of which screen ratio to use as the television standard. In order to facilitate the film on the TV screen, the National Television Standards Committee (NTSC) finally decided to adopt the college standard as the standard proportion of TV, which is the origin of the 4:3 TV picture ratio. This ratio is still the dominant standard for television until today.

So why choose 4:3? In our daily life, we often encounter rectangular-sized designs, such as the size ratio of windows, books, etc. of the house. Which size ratio is the most symmetrical and good-looking? There is a ratio in mathematics called “Golden Section”. That is 1:0.618. For the ratio of the length to the width of the rectangle, this ratio is used, and the visual effect is good, which makes it particularly comfortable. The screen of a normal screen movie is the size determined by the golden ratio. The width to height ratio of the frame is 4:3 (about 1:0.6). This standard has been used for many years. Everyone is used to calling this screen a standard screen. .

At present, the widely used 16:9 ratio is due to the fact that people have found that the horizontal angle of view suitable for people is larger than the vertical angle of view and the scenes that people see in daily life and the infinite boundary. In order to expand the horizon and increase the audience. Realism, so square the 4:3 ratio. The screen image on the wide screen gives a broader impression.

The current 2.35:1 actually puts the ratio of 4:3 to the third power, and the purpose is the same as 16:9, expanding the horizontal field of view. It greatly increases the sense of the image on the screen, which is conducive to enhancing artistic expression, especially for the performance of natural scenery, mass scenes and war shots. And this widescreen ratio allows people to enjoy this broader view.

The 2.35:1 concept of scale comes from the development of traditional film films. At present, the widescreen movies of many foreign film companies use the 2.35:1 standard.

Why use a curved screen? Traditionally, the projection device is either front-projection or rear-projection. Whether the projector is placed at the center of the screen or suspended from the roof, the distance between the projector and the screen is not equal. As a result, the brightness of the screen on the screen will be different. If the screen is large enough, you can see some distortion of the displayed image.

The curved screen is a good complement to this problem, allowing the projector to project the same light to the screen, thus ensuring the same brightness and distortion-free picture. This is indispensable for high standards.

What is the arc of the curved screen? It is actually where the projector is placed. Draw a circle, place the machine in the center of the circle, and measure the distance from the point to the point (ie, the viewing distance).

This kind of arc adds a large picture of 2.35:1 ratio, and the final effect can reflect the sense of tolerance that is immersive and difficult to extricate. Its power and appeal are indeed full of charm.

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