full led tv Difference Between Interlaced and Progressive Scanning

by:Leimove     2020-01-30





















Constant technological advances often lead to a revolutionary new technology that tries to replace some of the old and trusted technologies.In this article, we noticed such a modern-The day technology is called line-by-line scanning, while the old, trusted line-by-line scanning technology.Which will win?Let's find out by staggered.Progressive scanning debateAlthough it is considered a modern display technology, advanced scanning technology was first used in experiments in the 1920 s.However, due to its high bandwidth requirements, high cost, and complex transmission, it is scanned under the carpet, which is conducive to cross-line scanning.It was only in recent years that the technology was finally recognized by the public due to the advancement of electronic technology.When I met a 720 p video and a 1080i video, I opened the mouth of the big shark and went to 1080i immediately.Soon after, however, I found out that I was mistaken.Compared to the 1080i I have, the 720 p offers similar, if not better quality.The reasons why my choice went wrong were "p" and "I" for 720 p and 1080i, respectively "."P" represents line-by-line scanning, and "I" represents cross-line scanning.They are different display techniques used to display videos on our screens.In the following lines, I will try to explain the details of these techniques and try to highlight the differences between line-by-line scanning and inter-line scanning.So, let's take a look at how we actually scan on TV.Most TV systems adopt the display technology based on raster scanning technology.In it, the image to be displayed is divided into many horizontal lines, called "scan lines ".Each of these lines can be transmitted as analog/digital signals that are read by the TV system and "drawn" by the TV system individually on the screen.The painting is carried out at a very high speed, called "refresh rate ".Thanks to our persistence, we cannot tell or observe a smooth picture.Staggered scanning is a variant of the raster scanning method.It is mainly designed to reduce the bandwidth requirements of video signal transmission.In it, similar to raster scanning, the image is first divided into several horizontal scanning lines.The scan line is then divided into odd and even numbers.At any time, only odd or even lines are transmitted through the broadcast network.Therefore, at the end of the receiver, that is, on the TV screen, only odd or even scan lines are drawn at a time.However, this is done at a very high speed.Usually, after drawing odd lines, even lines follow in about 1/60 seconds.So effectively, the full image frames (even and odd) appear about 30 times per second on the screen.The visual insistence prevents us from noticing the process, and we feel that it is a whole picture that is painted on the screen.The staggered scan shows only half of the image at a time, effectively reducing bandwidth requirements by twice.The complexity of the entire broadcast Display system is greatly reduced.At fixed bandwidth, the refresh rate of staggered scanning is twice that of progressive scanning.This helps to see objects in motion, as the interlacing updates their position on the screen more frequently.Due to the reduction of cost and complexity, the staggered TV broadcasting system has become popular for many years and is the most widely used system at present.When viewing a very high-speed motion sequence, if the object moves fast enough to reach a different place within the time required to draw odd and even lines on the screen, A disturbing movement artifact will be created.An example of this is when you watch a tennis match on a TV system that implements staggered video technology.Intentional blur is sometimes introduced to remedy motion artifacts generated in staggered scans.While this helps, it also takes away the clarity of the display.Staggered scanning is not suitable for computer screens, especially when displaying text.Modern LCD TVs and LED TVs do not use raster scanning and therefore cannot benefit from staggered use.As such displays become more popular, the interlacing may become obsolete in the next 20 years.Line-by-line scanning is a more modern display technology.Inside it, all horizontal scan lines are transmitted together while painting on the display.As a result, the full image usually appears on the screen every 1/60 seconds.This gives the audience a clearer and more natural sense of display.The display implemented using an interline scan does not have a motion pseudo-image, because a full image appears on the screen each time.The video being displayed also does not require the introduction of manual blur.Each frame is a complete picture.Therefore, it will not be affected by the staggered artifact.Therefore, frames can be taken separately as static photos.Line-by-line scanning is a natural choice technology for computer screens.It shows the text more clearly and puts less pressure on the eyes that are used for a long time.Thanks to better clarity, higher contrast, realistic image reproduction and overall high quality of the display using progressive scanning, they have become more and more popular recently.The broadcast of signals generated by progressive scanning requires a lot of bandwidth, which makes the whole system more expensive and complex.This is the main reason why this technology has not yet become mainstream.Most modern displays use line-by-line scanning.However, broadcasters still send signals in staggered format.Therefore, a process called de-interlacing must be used to convert the inter-row signal to a non-Inter-row signal.Video on the receiving end.Going across rows tries to combine two separate fields into one frame, which usually does not give a very consistent result.Usually, this process introduces some visual defects in the video it outputs.It is clear from this discussion that line-by-line scanning is better than Inter-line scanning.It offers a more vivid and realistic display that attracts everyone.With the emergence of modern displays such as LCD and led, this display technology will be retained.While cross-line scanning is still dominant in the broadcasting industry, constant technological advances and declines in the price of related electronic devices indicate that, systems based on progressive scanning will certainly replace systems based on staggered scanning in the near future.
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