What is the number of TV lines in a high-definition TV? How to calculate

We often hear people say that the horizontal resolution of a high-definition television screen is how many lines. What does this mean? It should be defined as a pixel per screen length in the horizontal direction of a high-definition television. In popular terms, it is to measure a length along the horizontal direction of the TV screen to make it equal to the vertical height of the screen. The number of pixels contained therein is equal to the resolution expressed by the number of TV lines. Here's a simple example.


Increase the number of HDTV horizontal lines

The resolution of DVDs expressed by pixels is 720480, and the horizontal pixels are 720. The aspect ratio of the screen is 4:3 (previously used TV display ratio), converted into TV lines, horizontal resolution That's 720/34=540 lines, if we have heard other people mention the DVD resolution is 500 lines, take the source here.

Why use the "pixels per screen height" instead of horizontal pixels, this is to facilitate the comparison of the horizontal and vertical resolution, once their values ​​are close, it means that The pixel density in both directions is similar. With the development of science and technology, the traditional 500-line DVD has been unable to meet our pursuit of image quality. Full HD with a horizontal resolution of 1080 lines (1920/169, with the same pixel density in the vertical direction) can bring a clearer image.

So here, do you have a clear understanding of the TV line? Is there a technical method that summarizes it? That's right, the number of high-definition television lines = the number of pixels per screen length in the horizontal direction / (screen contrast), and the higher the number of television lines, the higher the picture's sharpness.

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