It is the actual distance of the TV from the viewer. If the distance is too far or too close, it will have a bad influence. For example, if you look at the distance too close, it may cause visual fatigue, and the screen will have a slight graininess and become less realistic. If you look at the distance too far, the details in the picture will be lost. When you watch TV, some subtitles and other small fonts will appear unclear and other undesirable conditions, thus affecting the viewing.
So how does the viewing distance count?
This depends on the size of your living room. Here is a simple calculation formula: TV's best viewing distance = TV screen diagonal x 0.0635. For example, for a 55-inch TV, the calculated result is 55x0.0635=3.4925 meters and 3.5 meters. Then for a 55-inch TV user, the distance of 3.5 meters is the best viewing distance.
Of course, we can also calculate the size of the TV that is suitable for the size of the TV. For example, if the viewing distance is 3 meters, then use 3 ÷ 0.0635 = 47.244 ≈ 47 inches, then you can buy 47-inch TV is most suitable. Of course, everyone does not have to be too strict in terms of size, such as distance of 2.6 meters, then choose 40-inch or 42-inch TV can be
Attach the TV's best viewing distance table, and everyone can choose the TV size based on this table.
In recent years, in large-scale shopping malls or activities, we always see the figure of "LED fan". Its appearance is similar to the fan, but it can display various patterns when rotating, and some can display dynamic 3D patterns, which is very cool. Every time we see it, we can always make people stop and watch it, which plays a very good role in publicity and promotion. So how do LED fans display patterns?
Strictly speaking, this so-called "fan" is just a vivid way to call it. In fact, it is a kind of "rotating LED light bar", and its professional name is holographic 3D smart glare screen. After power on, the "fan blade" starts to rotate, which can present a 3D image at the same time, cool and lifelike. At the same time, according to the size and color of the pattern, the LED fan can well hide its leaves, because there is no frame and no fixed screen, so the dynamic picture is like floating in the air, very realistic.
The 3D smart screen not only uses the hardware of rotating LED, but also uses the visual persistence of human eyes. For the hardware equipment of rotating LED, simply speaking, it is to calculate the change frequency of LED light according to the rotation speed of "fan blade". When different LED lights are lit at different times, different patterns will appear. The so-called visual persistence refers to that when the human eye is observing the scene, the light signal is transmitted to the brain nerve, which takes a short period of time. After the end of the role of light, the visual image does not disappear immediately, and the human eye can still maintain its image for about 0.1-0.4 seconds. This kind of residual vision is called "afterimage". The visual phenomenon is called "visual persistence", and the single product can be unique. Vertical display effect can also display the overall effect in combination.
3D holographic fan screen application: shopping malls, brand stores, stores, airports, etc. A good choice to reflect brand effect and brand grade
Principle of 3D holographic screen: Generally speaking, one or more strings of LED lights are arranged on the fan blades. Here, it is assumed that there are 20 LED lights, which are numbered 1-20 at a time from the axis to the edge of the fan blades. In order to explain the principle briefly, we assume that when the fan speed is 60 laps per minute (in reality, the speed is much higher), the human eye will have visual persistence. Let's assume that the LED light is 0 degrees above the fan in 0 seconds. If you want to display the effect of 6:00 on the fan, the minute hand needs to point to the top and the hour hand needs to point to the bottom. It is necessary to turn on the number 1-20 to display minute hand in 0 second, turn on the number 1-10 to display hour hand in 0.5 second, turn on the number 1-20 to display minute hand in 1 second, turn on the number 1-10 to display hour hand in 1.5 second, and so on, so that the human eye will receive a complete picture of the clock at 6:00. For complex patterns, LED fans will have more complex structure and programming equipment. Through the combination of LED light bar rotation and visual persistence, people will see a dynamic 3D picture of the rotating LED fan.
3D holographic fan screen structure: the screen body mainly has light bars and, according to different ones, some have two. Add rotary motor, built-in 3D holographic system and information receiving system.
At present, the main application of 3D smart screen is advertising. Because of its editability and realistic display effect, it is believed that in the near future, it will be applied in more fields.
3D Holographic Advertising LED Fan Display
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Shenzhen Vision Display Technology Co,.LTD , https://www.ledvdi.com