LED Display Screen Communication & control Methods

　　If you are looking for LED display screen China, you run across the technical terms like LED display screen pixel pitch or LED display screen pixel pitch. Understanding the pixel pitch and relation between the pixel pitch, resolution and viewing distance helps you to make the best decision according to your requirements, space and budget.

　　What is the pixel pitch?

　　The pixel pitch is the center to center distance of adjacent pixels measured in millimeters. In a plan term, pixel pitch shows the gap between the pixels of the LED display screen. The smaller pixel pitch means there is a smaller space between the pixels and there are more pixels, results in higher resolution and higher image quality. The figure below illustrates the pixel pitch for a high-resolution SMD LED module and standard resolution DIP LED module.

　　What is the effect of pixel pitch size on image quality?

　　Pixel pitch determines the resolution, minimum viewing distance and best viewing distance of the LED display screen. The smaller the pixel pitch, the more pixel and results in more details and higher image quality. So if you need to show high-resolution images or videos on your display, you need an LED display screen with a small pixel pitch. The following figure shows the pixel pitch effect on image quality.

　　Pixel pitch affects the viewing distance too. The minimum viewing distance is the distance that you can watch images and videos with an acceptable level of pixelation. The smaller the pixel pitch, the smaller gap between the pixel and the less pixelation of the image. Therefore, the viewer can stand closer to your display.

　　How to choose the best Pixel Pitch size?

　　To choose the optimum pixel pitch two factors should be considered, the viewing distance and the required image resolution. Smaller pixel pitches are better all the time and deliver you better image quality but, it costs more. You may decrease the expenses of an LED display screen by using a larger pixel pitch and still have almost the same image quality if the viewing distance is longer than the best viewing distance. The best viewing distance of a pixel pitch is the distance that your eyes won’t be able to the gaps between pixels anymore if you go further away.

　　Take an LED display screen with P10 modules (pixel pitch of 10mm). The minimum viewing distance for P10 is 10m and the best viewing distance is 20m. So, if people watch it from 10m to 50m away, they can see an acceptable image quality with a fading level of pixilation from 10m to 20m and a very good image quality after 20m. So you may want to increase the image quality using P8 or even P6 module for close range. But If the viewing distance was from 20m to 50m, there was no point to use a smaller pixel pitch with a higher resolution. Because the viewing distance was already more than the best viewing distance of P10.

　　As a rough estimation, P10 (10mm pixel pitch) is suitable for any outdoor application with a viewing distance of 10m and more. P8 or P6 (6mm and 8mm pixel pitch) can also be used if the target audience is at a closer distance. For an indoor LED display screen, P6 may suit any advertising needs with a viewing distance of 6m and more. P4 (4mm pixel pitch) can also be used if your audience is closer such as an LED video wall in a retail environment.

　　LED display screen Communication Methods

　　One of the most important parts of any electronic sign product is how to communicates with the software and how you can update it. Lots of factors need to be considered to decide about the best communication method. To choose which communication method suites your needs, you need to answer the following questions: How often do you change the sign information? What is the distance between your computer and the LED display screen? What is the elevation of your sign and how accessible is it? Can you provide cable or Wi-Fi internet connection in the sign location? There are lots of different communication methods and each method has its advantages and disadvantages.

　　USB Communication

　　The USB communication method is the most basic type of communication. In this method, software exports the new message and design as well as new settings to a USB drive. Then, the USB is plugged into the USB port of the sign to transfer the data. After new data is transferred automatically, the USB drive can be detached.LED display screen USB Connection

LED display screen USB communication

　　Advantage:

　　This is the most basic type of communication. It means no extra cost and a more reliable and easy repair and maintenance method hence there are no multi-step complex parts between your computer and your LED sign. It could be used as a backup communication in case of any faulty with other communication methods.

　　Disadvantage:

　　To use the USB communication method, you need to have access to the LED sign USB port. In case of the signs installed in high elevation or out of access, USB communication needs cabling or special consideration.

　　Wi-Fi Communication:

　　Wi-Fi communication has been a standard option for LED display screen communication because it is inexpensive and doesn’t limit the location of the sign and the location of the content management software. In this method, content management software communicates with the internal Wi-Fi module of the LED display screen directly using 2.4 GHz standard Wi-Fi frequency. This is the most common type of communication because it doesn’t need any other Wi-Fi or networking equipment.LED display screen Wifi Connection

LED display screen WiFi communication

　　Advantage:

　　Wi-Fi communication is the best if you have a LED sign or LED display screen installed out of access within 100m or if you want to update your LED display screen very often. It is inexpensive, flexible and doesn’t need extra communication devices installed.

　　Disadvantage:

　　This communication method is limited to up to 100m in the open area. Building or walls may reduce the coverage range result in shorter communication distances.

　　Internet Communication

　　This communication method is best for controlling one or several electronic screens from a far distance. In this method, controlling software communicates with the LED display screen or LED display screen through the internet connection. On the back-side, Content Management Software sends the new LED display screen or settings to a could sever by using any type of internet connection. On the screen side, the screen can download the data from the cloud server using another internet connection and update the settings and information. Therefore, there is no distance limitation between the controlling PC and the screen.LED display screen Computer Connection

LED display screen gprs 3G&4G communication

　　Advantage:

　　Can control one or several LED Signs or LED display screens from any computer with the software installed and connected to the internet. It is not limited to distance. Can use Secure TCP/IP.

　　Disadvantage:

　　Internet connection needs to be provided in the sign location. A monthly connection fee is required If there is no internet connection available in the sign location. Internet connection in the sign location may need modem (ADSL or 4G) installation or cabling.

　　Mobile Data - GPRS Communication

　　This communication method is best for controlling outdoor or mobile electronic screens from a far distance. For this type of communication, we use specific control cards with a data SIM Card option. Similar internet communication method, controlling software communicates with the LED display screen or LED display screen through an internet connection. On the back-side, Content Management Software sends the new descreen or settings to a could sever by using any type of internet connection. On the screen side, the screen downloads the new descreen from the cloud server using SIM Card mobile data (GPRS/3G/4G) and updates the settings and information.LED display screen 3G Connection

LED display screen internet communication

　　Advantage:

　　Can control one or several LED Signs or LED display screens from any computer with the software installed and connected to the internet. FINE PIXEL LED-China LED Signs can be mobile or fixed. It is not limited to distance. Doesn’t need any data cabling in the sign location.

　　Disadvantage:

　　A monthly connection fee is required regarding the mobile data plan.