LCD TV to buy errors, you actually do not need 4K!

The avalanche of the price of LCD TVs is truly breathtaking. Look at the 55-inch color TVs that Xiaobian bought for 1W yuan, and now the cheapest LCD TVs with 65-inch LCD TVs cost less than 4,000, which is really the price of cabbage, so manufacturers In order to attract eyeballs and raise the price range, various nouns and new sensations emerge one after another, of which "4K" is an important new selling point!

Now that I'm talking about LCD TVs, even the next-door Aunt said she wants to buy 4K, but do you really need 4K, and 4K really has come to us?

Let's go to science first

Whether the video program is clear or not, the most important and most direct is the resolution.

The resolution of the earlier VCD was only 320,240 pixels, while the DVD resolution was 720,480, commonly known as 480P, and most TV stations in our cable TV now have a resolution of 720480 or 720576 (the difference between P and N). Today's sofa butlers appear 720P and 1080P, which correspond to 1280720 and respectively. At present, some of the star programs on domestic TV stations have already achieved 1080i, but they are only a small part. So, if your TV is taken Cable TV, that 1080P enough!
Let's take a look at 4K. He is the so-called Ultra HD. The standard resolution can reach 3840×2160 pixels. In fact, you can see that it is the horizontal and vertical resolution of 1080P resolution2, and its pixels are. Reached four times the 1080P TV.

So, the size of a 4K movie will be much bigger than that of 1080P!

Then we can now reach out to the real 4K movies in daily life. Now let me tell you, no!

At present, commercial HD video source is generally Blu-ray DVD. A Hollywood blockbuster generally has a capacity of 30~40G, which means that changing to an online bit rate requires at least ten to twenty mbps. For popular terms, You need at least 50M of broadband to really play smoothly. At present, the so-called high-definition, ultra-high-definition real video bit rate of online is often within 5Mbps, so the so-called high-definition you see online is in fact a lot of compressed pseudo HD , and a real high-definition there is a big distance, and the so-called 4K area is even a lie, basically it does not even achieve the real Blu-ray high-definition standards!


Let's take a look at the actual sample
This is an Avatar Blu-ray DVD original image file, the single file size reached more than 46G, the maximum bit rate of 48Mbps, that is, if the Internet broadcast 100M broadband, such video files in the average consumer's home is Definitely not
What is the real 4K HD?

This is a display for a brand of 4K TV in a hypermarket. The title indicates 100Mbps, so I am afraid that the 200m or more broadband is required to play online now.


The length of 4 minutes, the length of the file reached 2.68G, if it is a large 2-hour film, it will take more than 80 G, even if the current double-layer Blu-ray disc can not be loaded.


This bit rate video is the real 4K ultra high definition, but even if it is played on the latest Core i6 quad-core I5 ​​core computer, it is not very smooth and far from popularization, that is, you see 4K in the mall. The beauty of television is the effect of Mei Mei Mei. It is impossible for you to get home!

In other words, although 4K is good, but you have no source, it is useless. In the past two to three years, 4K source cannot be truly popular. In fact, 1080P is not completely without popularity. Need to be confused by the 4K standard, choose on demand!

Attach a screenshot of the real original 4K movie.
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