[UHD TV] What does uhd TV mean? The difference between uhd TV and 4k TV
What is uhdTV
With the popularity of 4K display devices, we often hear the term UHD, UHD is ultra-high resolution, we understand it as 4K resolution Also can. Its main function is to greatly increase the number of pixels, which is what we often say on PC to increase the display resolution, and the 4K resolution can reach 4096×2160.
UHD TV is the abbreviation of (Ultra High Definition Television), which stands for “Ultra High Definition TV” and is the next generation technology of HD (High Definition) and Full HD (Full HD). According to the proposal of the “Ultra High Definition UHD” standard issued by the International Telecommunication Union (ITU), the display with a physical resolution of 3840×2160 (4K×2K) and above is called UHD, which is an ordinary FullHD (1920×1080) width and height. Twice the size and four times the area, UHD TV is a TV equipped with UHD technology.
The physical resolution of Ultra High Definition (UHD) reaches 3800 x 2160 (4K x 2K), so it is also called 4K Ultra HD, and its resolution is 4 times that of Full HD (FHD, 1920 x 1080) TV, 8 times on a high-definition (HD, 1280 x 720) display. UHD has 8.3 million pixels, so the number of PPI (pixels per inch) of 42-inch ultra-high-definition (UHD) is the same as that of 84-inch full-HD FHD, which is 84-inch full-HD PPI. 2 times the number, the image performance is clearer and more delicate.
uhdPrinciples of TV technology
What is UHD technology? In the field of digital technology, the size of a digital image is generally described by the number of pixels that constitute an image. Since the number of pixels is often very large, it is usually expressed in units of K, such as 1K=1024, 2K=2048, UHD=4096. In this way, a 1K image is an image with 1024 pixels in the horizontal direction, a 2K image is an image with 2048 pixels in the horizontal direction, and a UHD image is an image with 4096 pixels in the horizontal direction. Simply put, no matter how many K refers to the number of pixels in the horizontal direction. In the same principle, 2K is the number of pixels in the vertical direction.
Why UHD ultra high definition TV resolution can reach 3840×2160? What we usually call UHD TV is UHD×2K (3840×2160) resolution TV, UHD refers to the number of pixels in the horizontal direction, 2K is the number of pixels in the vertical direction. If you read the previous question, you will ask why not 4096×2048? Speaking of which, we must first introduce that UHD resolution has different standards in different fields, such as Full Aperture UHD (4096 x 3112), which is common in the film industry. , Academy UHD (3656 × 2664) and other standards. In the field of home appliances, the standard of 4 times the resolution of FULL HD is generally used, that is, the number of pixels of 1920 × 1080 resolution is twice the number of pixels horizontally and vertically. This is done entirely because the display ratio of 3840×2160 is 16:9, which is consistent with the display ratio of mainstream devices on the market. We can be 100% sure that UHD TVs are definitely a good thing.
A common 1080p (1920×1080) resolution TV can display effective pixels of 2,073,600, while UHD (3840×2160) TVs display an effective pixel of 8,294,400. The changes it brings are very intuitive , can be distinguished with the naked eye. The substantial increase in the total number of pixels enables the details of the picture to be displayed more delicately, and most directly brings some changes to the usage habits.
The difference between uhd TV and 4k TV
That is, 4K belongs to one of the categories of UHD , UHD includes more than 4K resolutions. In the general market, 4K=UHD, but the name is different. “4K” is similar to the nickname called by manufacturers and consumers, and “UHD” is the official name and the correct name.
