Is your home TV really 4K? Several small knowledge that you must know to buy a 4K TV

The definition of 4K traffic in the TV industry is: the physical resolution of the TV screen reaches 38,402,160. In the Ultra HDTV international standard released by the International Telecommunication Union on August 23, 2012, the definition of Ultra HD 4K is: horizontal resolution 3840, vertical resolution 2160, aspect ratio 16:9, total about 8.3 million pixels.

Is it really 4K TV with 4K? How many tricky 4K TVs are on the market? Now, let's introduce the little knowledge about 4K TV and help everyone to better buy 4K TV.

In the traditional liquid crystal technology, each pixel consists of three sub-pixels of R/G/B (natural, red, green, and blue primary colors). RGBW 4K technology is a 4K display technology developed by South Korea's LG Display Co., Ltd. It adds white sub-pixels on the basis of R/G/B, that is, the RGBW liquid crystal panel has 4 colors of sub-pixels.

What really got the RGBW 4 color 4K technology into the "pseudo-4K" argument is that RGBW technology does not add a separate white sub-pixel in each pixel, but uses sub-pixel sharing, whether Samsung or LG's RGBW LCD Panels use similar methods.

Simple, RGB three-color 4K panel, each pixel has 3 red, green and blue sub-pixels, and in the RGBW 4K panel, each pixel may average only 2-3 colors of sub-pixels, the actual total Only 6 million pixels.

In fact, 8.3 million or 6 million pixels are basically indistinguishable from the naked eye, but the biggest problem with the 4-color RGBW 4K panel is that the screen is white. Many low-end 4K LCDs made in the market are mostly made of RGBW 4-color panels produced by Korean LG and Samsung. If you are sensitive to the quality of your TV screen display, you need to pay attention to it when you purchase it.

The 4K video encoding format is HEVC, ie H.265. Compared to H.264 encoding in Full HD 1080P era, H.265 encoding is more complex and has a higher compression rate. Therefore, a dedicated decoder chip is also required for perfect decoding. There are some TVs on the market. The screen uses a 4K panel, and the decoder chip does not support H.265. This type of 4K TV also does not bring about a perfect audio and video experience. It also requires special attention when purchasing.

4K is only an improvement in resolution, and HDR technology (High-Dynamic Range high-dynamic range image) is a revolutionary innovation that really brings 4K TVs. It can bring a rich color and color hierarchy. It cannot be used in previous images. The details of the appearing shadows and details of the highlights can now be better displayed. Because the amount of data carried on the 4K+HDR screen is very large, it has exceeded the maximum supported 10.2G bandwidth of HDMI 1.4, so it must be connected to the HDMI 2.0 interface in order to have a perfect experience. When buying a 4K TV, pay attention to whether HDR and HDMI 2.0 are supported.

Extended reading: Is the HDMI interface of your home LCD TV correct?