Resolution and Scan

By | September 2, 2016

Resolution and scan display, regardless of its type – the most important characteristics largely determine the quality of the image and its “ comfort for the viewer’s eye.

Resolution

There are many accounting systems permits, many of which TV or projector or not applicable at all, or simply not used. A typical example – printers and scanners indicated by dots per inch (dpi). The resolution in this case is calculated for a particular unit area.

In the modern, consumer understanding, display resolution is specified as the ratio of the number of pixels forming the image, horizontal / vertical. For example, 1920×1080.

Ideally, the resolution supported by your display should match the resolution of the incoming video signal, but it happens not always. To adapt the video uses special algorithms, however, the ideal result virtually impossible to achieve. Everyone has probably seen a picture squares on the big screen – the usual result is a mismatch permits video / display.

In the era of analog television in the territory of a particular country is usually applied one of the systems and alternatives to it was not. Therefore, the buyer was not much need to go into details.

Now, when even within the same country, there are many digital formats, with various digital television standards, etc., display resolution panel acquired a hitherto unprecedented importance. For viewers issue gained relevance only in the relatively recent past, when the market appeared options panels with different resolutions and different ways refresh (scan).

Scan

There are two types of scan – interlaced and progressive. In the first case, the image is displayed on the screen with two half pictures “ – first only the odd rows of pixels, then – only even.

This system was a necessary measure in the past – the capabilities of the equipment did not allow for a short period of time to display entire frame. Image while retaining acceptable quality for the viewer (for lack of better). Interlacing is usually indicated with a resolution index `i`. For example – 1080i, where in 1080 – the number of lines and the letter – type of scanning.

Interlacing

Panel progressive scan displays the entire frame, all the lines sequentially, for an even odd. It is believed that this provides a more realistic image without creating discomfort to eyes.

Progressive scan

An important role is played by one of the defining indicators sweep – the number of frames displayed per second (sometimes specified in Hertz (Hz)). Today many options – from 60 Hz and above. More expensive models offer a sweep in the 120, 240, 480 Hertz and more.

The most relevant types of permits

Support analog signal in most modern types of TVs is usually provided by default. Most likely, your panel will have a decoder that handles PAL, SECAM, NTSC. With digital resolution is somewhat more complicated.

Most relevant three formats:
720p (1280×720 progressive)
1080i (1280×1080, 1440×1080, 1920×1080 interlaced)
1080p (usually – 1920×1080 progressive scan).

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