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Smart TVs are new products that are technologically innovative and adapt to the trend of the times. Smart TVs can install and uninstall application software through cable receivers (set-top boxes) and integrate audio, video, entertainment, data, and other functions to meet the diverse and personalized needs of users.
Smart TV has an open operating system and chips, and has an open application platform. This is very similar to computers and mobile phones. In addition, it has many things in common with mobile phones and computers. 
1. Smart operating system, users can install, run and uninstall software, games and other applications.
2. Stronger hardware devices, including high-speed processors and storage space, can be used to run and store applications.
3. With a variety of interactive applications, such as human-computer interaction, content sharing, multi-screen interaction.
4. Can connect to the public internet. 
Since the functions of smart TVs have been upgraded compared to traditional TVs, then the purchasing factors will no longer be as simple as the 1990s. In this case, how can we pick a smart TV with better performance and higher cost performance? 
Generally we can apply the following calculation formula to choose: TV's best viewing distance = TV screen diagonal × 0.0635
In addition, the size and population of the family space is also an influencing factor for the size of the selected TV, which can be used as a reference.
Considering people's watching television habits and the market's popular screen size, the following Xiaobian gives you a list of the most suitable size suggestions for your reference. 
First of all, let's clarify some of the arguments about resolution.
The best viewing distance for watching TV (centimeters) = screen height ÷ vertical resolution × 3400
According to the vertical resolution method, the television can be divided into standard definition, high definition, full HD, and ultra high definition. The so-called SD, refers to the vertical resolution is lower than the 720p screen, HD refers to the vertical resolution of 720p, the resolution of 1280 × 720 image quality, the screen ratio of 16:9. Full HD means the picture quality with a vertical resolution of 1080p, a resolution of 1920×1080, and a ratio of 16:9. Basically 2k screen, marked with "FULL HD". The so-called ultra-high definition refers to the vertical resolution of 2160p, a resolution of 4096×2160, 16:9 aspect ratio, is the legendary 4K screen.
For the relationship between TV resolution and size and the best viewing distance, refer to the following table: 
5. Application Market General smart TVs come with their own software and video resources. But this is not enough for our viewing needs, and usually some mainstream playback software is also installed. Therefore, when buying, it is best to choose Android TV with smart TV, and it is better to have the installation permission to support third-party applications. 
7. The WiFi interface tries to select the smart TV that supports the 80.11ac channel standard in the 5Ghz band. If 2.4GhzWiFi or 5GHz frequency band 802.11n is used, these are relatively low. Caton is likely to occur when watching ultra-clear TV programs. 
9. How to operate If the family members are more stratified, there are old people and children, you can choose to operate the TV is relatively simple and easy to use, it is best to support voice remote control, the complex operating mode for both groups will be It's a lot of trouble. 
11. Sub-materials The 4K TV refers to a TV with a resolution of 3840 × 2160 pixels, and is constantly innovating both in quality and function.
However, because of the relatively high screen cost of 4K TVs, the price is relatively high. Video requires a large amount of network transmission. If the family's broadband is not enough, it is easy to get stuck. So whether to choose 4K, or according to their actual needs and their own conditions. 
Although smart TVs have obvious advantages as emerging electronic products, with the increase in popularity, the exposed shortcomings can not be ignored.
advantage:
1. Simplify the living room. Smart TV can solve the problem of one box being inserted into another box, which means that there are fewer cables scattered in the living room, and the living room will become neat and tidy.
2. Entertainment Center. With the development of smart TVs, it is bound to realize a series of entertainment functions such as searching TV channels, recording TV programs, and broadcasting satellite TV.
3. Smart and convenient. Smart TV has a great tendency to realize cross-platform search among TVs, networks and programs.
4. The third type of information access terminal. After computers and mobile phones, many users may also be able to access and browse the information they need on TV.
5. Fully functional. Smart TVs have various application services such as web search, IP television, video on demand, network news, and Internet TV. 
1. Software upgrade issues. Smart TVs may have problems after they have been updated.
2. It cannot be perfectly fitted. Most TVs on the market today still use the Android operating system. However, this system is only an operating system for mobile terminals. The TV platform is also an operation for the Android system. It does not fit the TV platform perfectly, and may affect the TV platform to some extent. Customer experience.
3. Application software to be developed. The distinctive feature of smart TVs is that they have an open TV application store and can provide a wealth of application software, but the range of applications for smart TVs is still relatively small and needs to be strengthened and expanded.
4. The traditional remote control cannot be fully applied to smart operation. Although the interaction between the smart TV and the digital home device is performed through a remote controller, the traditional mode TV remote controller cannot completely satisfy the smart operation with the development of the function, and the mode needs to be reformed.
[baby recommended] 
Smart TV/box information can focus on smart TV information network sofa butler (http://), China's influential TV box and smart TV website, providing information, communication, TV boxes, smart TVs, smart TV software, etc. Answering questions.
Buy smart TV, you have to pay attention to these points?
Once, the most convenient channel for people to obtain information from the outside world is television. Current events in television and popular movies have brought a lot of fun to our lives. However, with the advent of the Internet era, computers and mobile phones have gradually replaced television as an indispensable thing in people's lives. So does that mean TV is being eliminated? With the technological innovation, the rise of smart TVs has gradually brought television back to the public. However, many newcomers who have not yet entered the field of smart TV may feel at a loss. What exactly is called smart TV? As a novice, how do you choose smart TV? Xiao Bian talked about this topic today. [Smart TV is what? ] For example, smart TVs have the following features comparable to computers and mobile phones: [When you choose a smart TV, what should you look at? ] 1. The TV size is the best choice when you choose to hang vertical TV, so more space-saving. This means that the TV size is not as big as possible, but the TV size must be selected according to the optimal viewing distance of the smart TV and the TV occupying the wall area. 2. The picture quality of television is probably no matter what age, the core value of the TV is the picture quality, this is the core function of the TV, it is about the cost of the TV. Therefore, the purchase of the TV must be under the premise of maintaining the playback effect, and then go to discuss other functions. Because, whether it is USB playback, or network functions, intelligent functions, are more than the quality of the more real. 3. The resolution of the screen resolution is mainly determined by the screen size and viewing distance. The resolution of the TV is far from the resolution, but when you watch it closely, you will notice a big difference. 4. Sound quality In most cases, the TV speakers can meet daily needs. However, to purchase a higher quality sound quality, you must adjust the TV sound to the maximum when you purchase it. Pay attention to the sound of people and the background, and you will see “glitches†and other noises. 6. HDMI Interface Most smart TVs currently use the HDMI1 or HDMI2 interface. However, different models have different degrees of delay. If some people want to play games such as XBOX/PS3, or if they want to use a TV as a computer screen, they should pay attention to the smaller the delay, the better, it is better not to exceed 100 milliseconds. 8. Demand TV As a traditional home appliance, the usage cycle is relatively long, so when it comes to selection, it must be purchased according to actual needs. If there is a large demand for Internet functions, you can choose a smart TV that has the Internet's quick browsing function. If you have a large demand for entertainment functions, you can purchase a smart TV with its own game or a multimedia function. In short, it should be decided according to specific needs. 10. Family Recommendations For a family, television is not a personal demand product. Therefore, when shopping, it is necessary to understand the needs of family members first because television is to a large extent the item that everyone in the family should come into contact with. It should be weighed against everyone's needs and suitable for everyone. 12. After-sales service After-sales service is an important factor that we need to consider when purchasing electronic products and home appliances. That is, we must fully understand whether the brand's after-sales service is in place, while paying attention to product configuration with high performance and low price. , And the convenience of the maintenance point. [What are the advantages and disadvantages of smart TV? ] Disadvantages: TCL 55A660U smart TV. Slim body made of all-metal, with a breakthrough rear shell design, using non-impurity aerospace aluminum, with multiple processes such as polishing, drawing, and sandblasting. 4K + HDR, can bring more clear senses, significantly enhance the contrast and the screen level, clarity, brightness, color has also been a breakthrough. H.265 decoding, online fluency to watch 4K ultra-high-definition content, not stuck. High-performance TV processing chip, 1.8GHz frequency, professional-level game effects. The application market is complete and various types of functions are abundant. Nearly 2,000 hours of video resources are updated every day to meet the needs of different groups of people. The TCL 60A730U smart TV integrates TV chips, backlight modules, and night view screens into the airframe to create a breakthrough slim design. Aviation-grade aluminum, metal texture with both quality and beauty, simple and generous. HDR technology can perfectly present 4K, and the picture level is greatly improved. With high-performance processors and main frequency, the computing, image and audio processing capabilities are powerful, perfectly presenting entertainment images. The artificial intelligence system can tailor the favorite programs according to the operating habits, and can also operate by voice. LG 43LH5700-CD smart TV, IPS hard screen, LG exclusive registered design, the screen is stable, any angle can show full HD realistic, gorgeous colorful picture. Intelligent virtual surround sound for fuller surround sound. Automatically enhances speech and noise reduction. Support HEVC decoding technology, triple XD engine, faster playback. Sharp/Sharp LCD-60SU465A smart TV, high-definition 4K panel, perfect for handling detailed images and edge images. Each panel has been manually fine-tuned to ensure eye protection and eye protection. 178 ° wide viewing angle, large horizon, more intense viewing experience. 64-bit TV chip, watch 4K video, open applications, play games without stalling. Dual magnetic speaker, fever audio decoding, the effect is more outstanding. Panasonic / Panasonic TH-43DX680C, 18mm all-metal slim body, simple and elegant, stylish. IPS hard screen and high-brightness screen design solve the problem of diffuse reflection of light loss. The 178-degree wide viewing angle restores the primary colors at any angle and clearly presents the screen content. 64-bit chips, 8-core processors, HD video, 3D games run without stress. HDMI and USB3.0 interface, transmission quality lossless, 4K playback. Suspension sound design, surround sound, a sense of orientation and on-site sense. Sony/Sony KD-75X9400D, 4K+HRD technology, has broken through the traditional definition, brightness, color, and perfectly displayed the dark details. Unique dynamic backlight system, according to the image content to make local backlight adjustment, enjoy ultra-thin wall-mounted experience and clear contrast between light and dark. Fine tuning, immersive and infectious, bringing shocking live effects. Equipped with Android 5.0 system, one-click installation of entertainment software, massive network video coverage, and sustainable updates. You can share photos and videos from your phone or tablet to your TV via the AV sharing feature.