Shenzhen ADD Tech Co., Ltd

1.What is a LED ?

LED is the acronym of Light Emitting Diode and it is a semiconductor that emits visible light when electricity pass through it . The emission of light depends on electrons flowing between anode and cathode and the color of the visual emission (that can be Red,Green ,Blue , Amber,White ) depends on the material utilized .

2.What is a pixel ?

By definition , the pixel is the luminous dot present on every LED device , from the simple alphanumerical single line display to full color huge screens . This luminous dot can be formed by 1 or more LEDs depending on dimensions and features of the device . For example , on a small-size single line display , the pixel is formed by 1 single LED while on the king-size model the pixel can be formed by 20 LEDs. In some products , the pixel can be composed by up to 36 LEDs.

3.What is the pixel pitch ?

The pitch of a LED display defines the distance between the pixels , expressed in millimeters. This fundamental measure determines the characteristics and the performances of a LED huge screens : the pitch indeed is a defining factor of a screen's viewing distance : The smaller is the pitch ,the shorter is the minimum viewing distance , the higher is the total number of pixels present on the screen (and therefore higher is the screen cost per area ) ; The bigger is the pitch , the longer is the minimum viewing distance ,the lower is the total number of pixels present on the screen (and therefore lower is the screen cost per area ). The pixel pitch therefore determines the LEDs density , which is usually called Resolution .It is important to notice that while reducing the pixel pitch , the LED density increase exponentially : for example , reducing the pitch by the 50% on the number of pixels grow of 4 times .

4.The cost of a giant size led display ?

The final cost of a LED huge screen depends on two main factors:
The resolution (meaning the total number of LEDs present on each square meter)
The size of the huge screen (meaning the number of square meters needed to create the screen)
Because of the great variability of both these factors depending on the customer's needs, it is impossible to determine in advance the cost of a LED huge screen.
To provide a term of comparison though, we can say that the PRICE OF EACH SQUARE METER of a huge screen, is included between the cost of a scooter and a the cost of a powerful motorbike, depending on the resolution required.
As a consequence, the total cost of a huge screen can be calculated multipling the cost of a single square meter by the total number of square meters needed.
 
In the huge screen field, usually the bigger is the screen, the better: big size huge screens have a higher number of vertical and horizontal pixels. Higher is the number of pixels available, higher is the screen's definition and therefore better is the image quality. Obviously, the larger the screen the greater the cost.
 
 

5.What is the resolution ?

The resolution is nothing else but the number of pixels present on each square meter. The resolution is therefore opposite proportional to the pixel pitch: smaller is the distance between two pixels, higher is the resolution (because on the surface of the screen is present an higher number of LEDs). For example a 20 mm pitch screen has a resolution of 2304 pixels: this measure is obtained dividing the total length of a single module (960 mm) by the pixel pitch (in this case 20 mm) resulting in the number of pixels on a single line: 960:20 = 48 pixels. Multiplying the number of pixels present on a single line by the total number of lines the result is the total number of pixels present on the screen surface, also called Resolution. In our example, 48 x 48 = 2304 pixels in total. Given this formula, it is possibile to calculate that a 30 mm pitch screen has a resolution of 1024 pixel per module, while a 10 mm pitch screen has a resolution of 9216 pixels per module. It is important to notice that reducing of only few millimeters the pixel pitch, the LED density (and therefore the resolution) increase exponentially.

Remember: Smaller is the pitch ,Shorter is the minimum viewing distance ,Higher is the total number of pixels present on the screen ,Higher is the quality image ,Higher is the screen cost per area.

6.What is the definition ?

The definition is the number of vertical and horizontal pixels that are on the entire screen. For example, some standard definitions are 96x64 pixels (=low definition); 256x192 pixels (=medium definition): 640x480 pixels (=high definition). The definition is therefore related to the pixel pitch, the distance between the pixels. To simplify and clarify the terminology, it is possible to say that the RESOLUTION is referred to the single module, while the DEFINITION is referred to the entire screen, once that all modules have been mounted.

7.What is the IP protection grade ?

The IP rate identifies the Ingress Protection against humidity and dust. The IP level is described by 2 two figures: the first one is referred to the protection level against dust, the second against water. The Ingress Protection level is an international standard and it is utilized to measure the waterproof ness of any electronic products. Devices with a higher IP level keep the internal components safe and clean. Our huge screen guarantee a IP65, the highest reachable in the LED visualization field. In the table below are summarized the different IP levels and their description.