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How to select the most suitable large splicing screen

Some friends asked about the selection of splicing screens. In fact, this problem is common in weak current projects. Today, let's learn about how to select the main splicing screens in the market: PDP, DLP and LCD.

Digital Light Procession (DLP)
DLP's full name is " Digital Light Processing". That is to say, this technology first processes the image signal digitally and then projects the light. Specifically, DLP uses the digital micromirror device (DMD) as the main key processing element to realize digital optical processing.

Advantages of DLP:
1. large size and small seam 
2. Digital display with slow brightness attenuation, small seams in pixel points and fine images
3. Be suitable for displaying computers and still images for a long time.

Disadvantages of DLP:
1. Its brightness is lower than that of plasma
2. Uneven brightness will occur with the increasing number of splices 
3, Relatively large occupied space, large power consumption, and high cost for the later maintenance 

Plasma Display Processing (PDP)
Plasma display generally consists of three layers of glass plates. The inner surface of the first layer is a vertical grid coated with conductive material, the middle layer is an air cell array, and the inner surface of the third layer is a horizontal grid coated with conductive material. To light the air chamber of a certain address, a higher voltage should be applied to the corresponding row first. After the air chamber is excited and lit, the brightness of the neon chamber can be maintained with a low voltage. As long as the voltage is reduced the corresponding unit will be turned off. The cycle time of the gas chamber switch is 15 ms. By changing the voltage, the plasma display can display patterns with different gray scales.

Advantages of PDP: (Plasma)
1. High uniformity of single screen
2. High brightness at initial installation stage
3. High contrast and fine image 

Disadvantages of PDP:
1. Large seam in pixel points
2. Be easy to burn while displaying computer images or still images 
3. Fast brightness attenuation and cannot be improved
4. Low reliability and high power consumption

Liquid crystal display (LCD)

Liquid crystal is in line with the principle that liquid crystal deflects under the action of voltage. Since the liquid crystals that make up the screen can display the three primary colors of red, green and blue at the same point, or one point of the liquid crystal is superposed by three points, they are arranged in a certain sequence, and the liquid crystals can present different colors by stimulating them with voltage, and the matching of different proportions can present ever-changing colors. The liquid crystal itself does not emit light but depends on the backlight tube to emit light. Therefore the LCD depends on the backlight tube. Because liquid crystal uses dot imaging, the more dots formed in the screen, the finer the imaging effect, and the vertical and horizontal dots form the resolution of the liquid crystal television. The higher the resolution, the better the effect.

Advantages of LCD:
1. Low power consumption and light weight
2. Easy to install and can be spliced arbitrarily
3. Long service life (normally working for more than 50,000 hours)
4. No radiation, with uniform picture brightness and good picture quality
5. Lower cost for the later maintenance 

Disadvantages of LCD:
Can't achieve seamless splicing (the narrowest bilateral splicing has already achieved 1.8mm, almost negligible)
Summary
Starting from its own environment (energy saving, long service life and low maintenance cost), through the above analysis and market understanding, it is obvious that the LCD screen has the most advantages and the least disadvantages, and is selected as the screen of the central control room.

Several main parameters for LCD splicing screen selection: size, brightness and splicing seam
1. Size: There are screens of 40 inches, 42 inches, 46 inches, 55 inches and 60 inches in the market. Screens of 46 inches are generally chosen in the market with the highest cost performance. (Screens of 40 inches have poor overall picture effect and screens of 60 inches are too expensive.) 

2. Brightness: The main brightness of 46 - inch screen is 450 CD/M2 and 700 CD/M2. 700 CD/M2 is generally chosen for outdoor (because of large outdoor brightness). 450 CD/M2 can be considered for indoor with the price is half of that of 700CD/M2.

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