The retinal screen tells you how much cattle 4K TV has
Customized Solar Panel, 100watt solar panel,200watt solar panel, big solar panel, high efficiency high quality solar modules
different power customized and OEM logo customized solar panel
Customized solar panel data
Customized Solar Panel,Noncrystalline Solar Panel Module,Cheap Price Pv Solar Module,Solar Photovoltaic Pv Panel PLIER(Suzhou) Photovoltaic Technology Co., Ltd. , https://www.pliersolarpanel.com
Screen resolution is enough to see ppi?
The mobile phone is the most important consumer electronics device in the world, and China’s mobile phone users have also approached 1.3 billion. It is because of the popularity of almost one person that the technology and function of the mobile phone deeply affect people's understanding. Many people have come into contact with the concepts of "retina screen" and "ppi", all starting with mobile phones. Under the propaganda of the business, people subconsciously think that the retinal screen, high ppi is synonymous with a clear screen, and brought this conclusion to the display, television, projection and other industries. But in fact, there are many factors that affect people's visibility, especially if there is a big difference between products in different industries. 
Apple's Retina Screen
The retina screen that we said was first introduced by Apple in the iPhone 4 conference in 2010 and represents a high-resolution screen with a resolution that exceeds the limit of human eye recognition. Jobs initially defined it as: "When you take something 10-12 inches (about 25-30 cm) from you, its resolution is only 300ppi (300 pixels per inch) above the "magic number" Your retina can't tell the pixels." 
It's also important to watch distance
We can see two key figures from the definition of the retinal screen of apple: one is "10-12 inches (about 25-30 centimeters)" and "300 ppi (300 pixels per inch)". The clarity of the screen we see is also determined by the fact that these two data are common. But people often ignore the impact of distance on the viewing, only through the ppi, that is, the density of pixels to determine the exquisite degree of the screen. If in the mobile phone industry, because the distance to watch the screen is similar, relying on ppi to determine the clarity of the screen is still possible. However, the concept of 300ppi is completely meaningless for watching TV screens with a distance of more than 2 meters. Below, the author will give you a detailed analysis through calculations.
The viewing distance is proportional to the number of screen sizes
If you want to accurately calculate the ppi value that can be identified by human eyes at different distances, detailed scientific research and complex data calculations are needed. The cost and time are enormous. Therefore, we now make a rough estimate based on existing data and some optical knowledge. This makes it possible to easily and easily derive the link between several data, which is to facilitate our understanding and to draw the necessary conclusions. 
Human eye structure is similar to the camera
Let us briefly talk about the structure of the human eye. The human eye is like a camera. The structure of the front cornea, lens, etc. is like the camera lens, and the retina responsible for imaging is equivalent to the camera's film or photosensitive element. The resolution of the retina of the human eye is constant, and the resolution within a certain range of viewing angles is also constant. That is to say, whether the object is near or far, whether it is big or small, as long as he occupies the same size perspective of the human eye, then the resolution of the human eye to see this object is certain. With a certain resolution, the bigger and bigger the thing, the bigger the size of each pixel; the closer the thing is, the smaller the size of each pixel is. 
The resolution of the human eye in a fixed viewing angle is certain
Now we can conclude that as long as the screen occupies the same view of the human eye and has the same resolution, whether it is big or small, it is far and near, and the final viewing effect is the same. Now the screen aspect ratio of the smartphone is 16:9, which is the same as that of the TV. According to the perspective principle, we establish the data relationship between mobile phones and televisions that occupy the same perspective (pictured). It can be concluded that the size of the screen is directly proportional to the viewing distance. 
The viewing distance is proportional to the number of screen sizes
For ease of calculation, we chose the iphone6 ​​plus phone (screen size: 5.5 inches, resolution) and a 55-inch TV with a resolution of 1920×1080. Iphones are known to have a viewing distance of 10-12 inches (approximately 25-30 cm) and allow them to occupy the same viewing angle. It can be concluded that the 55-inch 1080P TV requires only a viewing distance of 2.5-3 meters to achieve the same definition as the iphone6 ​​plus. In fact 55-inch TV viewing distance is often even more than 3 meters, an increase of the viewing distance leads to TV projection to the human eye image ppi higher, that is, 55-inch 1080P TV will be able to complete the iphone6 ​​plus mobile phone super Retinal screen. And the current television resolution has entered the 4K era and can provide four times the resolution of 1080P. It can be said that in the mainstream of 4K TV, the top retinal screen phone is simply not worth mentioning. 
Viewing a 55-inch Full HD TV at 2.5 meters will achieve the same clarity as the iphone6 ​​plus 
Formulas available
Of course, some people will say that the ppi of the iphone6 ​​plus phone is not the highest, then we take the highest ppi:534 mobile phone to test it. Now the mainstream ppi reaches 534 phones with LG G3/OPPO Find 7 and so on, with a screen size of 5.5 inches and resolution. However, the resolution is only 1.78 times that of 1080P, while the resolution of 4K TV (parametric picture article) is 4 times that of 1080P. At present, the highest 5.5 inch 2K resolution mobile phone, ppi, the screen to watch the exquisite degree is also far less than 4K TV.
Why the TV screen does not look like a mobile phone
From the previous calculations, we can see that although the television has a low density of pixels, we will not look at the TV and we will have a certain viewing distance. In actual viewing, the television can provide a clear display far beyond the mobile phone. However, there are also many people who question that many video content is very clear on the mobile phone and on the board, but it will look a lot more confusing on television. Why is this? 
Watch the contents of the phone on TV
When comparing the clarity of television and mobile phones, many people ignore the quality of the video itself. Users who have used a computer to watch videos surely know that many videos look very clear in a small window, but when they are full-screen, the screen will obviously be a lot more obscure. This is mainly due to the lack of clarity in the video itself. This is also true for TVs and mobile phones. The screen of the TV is relatively large, and the resolution is higher. When a low-quality video is played on the TV, a resource pixel appears through a plurality of actual pixels. The mobile phone has a lower resolution and is closer to the resolution of the original video. Therefore, the content of low-quality video on TV will become even less clear. 
Low-quality video plays better on large screens
We look for a lot of high-definition and ultra-clear resources from the Internet. Strictly speaking, we can't reach the high-definition ranks. Strictly speaking, the mainstream formats such as FLV, MP4, and RMVB cannot be considered HD. Although their resolution may be relatively high, their encoding will cause their pictures to suffer a lot. The video formats such as MKV, AVI, MTS, etc. will be much clearer, but the size will be larger. When you use the TV to play HD and super clear content in these formats, you can clearly feel the fineness and clarity of the picture. 
4K TV is already very clear
The role of television is mainly used to watch programs and movies, and the role of mobile phones is more communication and Internet access. People's subconscious will have higher requirements on the picture quality of the TV. Plus a large enough screen will make it easier for users to find out the flaws in the picture. People's requirements for watching videos on mobile phones are relatively low. Coupled with small screens, the small flaws in the screen will be overlooked.
The data tells you how much cattle 4K TV
The low-quality video resources will be very unsatisfactory on the TV, and the resolution is not as good as the small-screen mobile phones. But when playing high-definition video, the TV has an amazing performance. Now mainstream TVs have entered the era of 4K. Chaoqing has four times the resolution of 1080P and the number of pixels reaches 38,402,160. Based on the above-mentioned positive relationship, we calculate the 4K TV clear effect equivalent to how many ppi phones. 
What is the level of 4K TV equivalent ppi?
The size of the 4K TV is now very rich, and here we have selected 42-inch, 50-inch, 55-inch and 60-inch TVs for the most common sizes to calculate. As for the viewing distance, although there is no scientifically accurate best viewing distance value, we can find the closest viewing distance and the farthest viewing distance of each size TV. By this value we can calculate the equivalent ppi of each TV. 
The TV's recent and farthest viewing distance is directly proportional to the TV size
Since the TV's recent and farthest viewing distances are directly proportional to the TV's size, the final equivalent screen size and equivalent ppi value are the same for each size TV. The closest viewing distance can give a minimum equivalent ppi value, while the farthest viewing distance can give the maximum equivalent ppi value. 
The minimum ppi value obtained by the closest viewing distance 
The maximum ppi value from the farthest viewing distance
Now the mobile phone has the highest resolution of 2K, which is 25601440. Among them, the ppi of the 5.5-inch mobile phones such as the LG G3 and the OPPO Find 7 was the highest, reaching 534. The second is the 5-inch full HD resolution phone, such as the HTC Butterfly, the millet M3, and the ppi is 441. The ppi of the Apple iPhone 6 Plus is 441. It can be seen from the data that the equivalent ppi of 4K TV is still higher than the current high-end mobile phone. 
The equivalent ppi value of 4K TV is obviously higher than mobile phone
But television is television, mobile phones are mobile phones, they have very different division of labor. TV has a larger screen, higher resolution, and placed on the opposite side of a comfortable sofa. It is a platform for watching shows and videos. It is the best place for users to entertain at home. The mobile phone pays more attention to mobility and portability, enabling users to browse the web, view pictures, and watch videos anywhere, anytime. 
Although the screen resolution and picture quality of mobile phones are constantly improving, they are limited by the way of viewing, and the final effect is still very different from that of television. Moreover, due to the closer viewing distance of mobile phones, it is more likely to result in fatigue of both eyes. The previous comparison is not simply for the sake of separating the weak and the weak, but for the user to realize that television is the best platform for watching shows and videos, and to use different devices correctly and to play their different roles.
Recommended Download Sofa Manager download address: http://app.shafa.com/ 
solar cell type
mono crystalline half cut cell
power range
50watt to max 700watt
size and weight
different size and different weight if the power is different
solar panel type
monofacial or bifacial
solar panel color
sliver or black
Product details and pic
