The LED display or LED sign is basically a flat panel board. It comprises of small LEDs. The LED display signs show images, text, videos or video signals grayscale. The diversity is endless when it comes to displaying content. LED is an abbreviation of Light Emitting Diode. The diode is mostly composed of Gallium (Ga) normally combined with the compounds of phosphorus (P), Arsenic (As), indium (In), and nitrogen. The diode, in reality, is a p-n junction. It emits light on exposure to the electric current. The energy releases as photons and the entire process is termed as electroluminescence.
The atoms of primary materials used in LED display panels are strongly bonded. Normally Aluminum-gallium-arsenide (AlGaAs) is the key component. In stable form, it is hard to conduct electricity. Therefore, doping is carried out to disturb the electron-proton balance. The disturbance should be sufficient enough to facilitate passage of electric current. Either the electrons are sucked back to create a p-type junction or else injected to create N-type junction. The whole procedure promotes the conductive properties of the semiconductor. In semiconductors, the current does not travel in a reverse direction.
This is indeed a very genuine question. The answer is the immense utility and versatility of LED displays demand very detailed working. First of all, we will discuss the place of LED billboards and displays in our life and then the important parameters to be taken care of.
The LED billboards and LED signs are normally known as destined devices. You can see them mostly at highways, roadsides, shopping malls, and similar other places. They are huge in size and offer crisp and quality images. The crystal clear, seamless quality is a treat to eyes. Viewers pay more attention to LED displays than their home-based television sets.
Since people today are more social the time they spend now in front of television sets is much reduced. Also, watching ads is irritating so they simply switch the channel. LED signs conversely don’t let you go anywhere. The striking color and charming appeal enforce you to go through the message.
It is a proven fact that LED billboards push the viewer for a call to action. More than half of the viewers, actually develop brand recognition. And that’s a big deal no doubt.
Be it informing about an ongoing eco-friendly campaign, vaccination against diseases, flood alarm or guide about raising better crops LED billboards and LED signs are leading the league. The option to play dynamic content is indeed an important factor for the effectiveness of LED displays.
You will see more general advertisements on TV. For instance, everyone sees painkiller, baby food, detergent ads whether they like it or not. LED billboards target consumer psyche using programmatic advertising.
It is really impossible to jot down all the benefits of outdoor LED advertising since they are countless. So, we are heading next. We will discuss what parameters are important for a good outdoor LED display.
The LED display should have a surface flatness within ±1mm. This is to safeguard that the shown content is uniform and distortion free. Any recesses or bumps may literally cause the viewing angle of the LED screen to appear as a dead angle. The quality LED billboards is largely determined by the manufacturing processes involved. Digital display manufacturers like DAKCO are the best when it comes to LED display solutions.
Of course, the main motive of outdoor LED advertising is to get noticed. We agree that the placement point is very essential no doubt in it. But imagine how the viewer will feel with inappropriate screen size? Of course, distracted or irritated. Prior to choosing the screen size you should precisely know the viewing distance and viewing angle of the viewer. Only then you can know what screen size is best.
For instance, the giant LED billboards are ideal for heavy and far traffic. A viewer can spot the advertisement miles away. However, consider putting the same screen out of the mall endorsing brand. The inappropriate sizing will distract the viewer at first sight. Engrossed in viewing the big screen he may literally end up banging his head in the door so be careful. Alternatively, placing a relatively smaller screen on highway won’t do any good. Instead, the viewer may curse the non-sense LED display. It is not the size that matter it’s the right proportion that counts.
First, assess your all requirements and then go for the purchase of a good outdoor LED display. Content size is another important parameter. Carefully assess the viewing distance. If the car travelers are to read your LED sign then of course content should be readable. For simplification let us tell you a simple rule of thumb. For illegible content, you need minimum 2inch height for every 100 ft. distance. However, if you are interested in full-color LED sign supporting both image and video content you can choose an even bigger size for enhanced impact.
LED displays that support scrolling text only can work with less character height too. However, outdoor LED video walls and full-color displays need more space to highlight the background and other details of the content.
Pixel pitch is basically the distance from one LED center to other LED center. There is an inverse relationship between the resolution and the pixel pitch. Short pixel pitch means higher resolution. Again the viewing distance will determine the exact pixel pitch and resolution you want. When talking about Indoor LED sign supporting image and video P6 LED modules offering 6mm pitch is the industry benchmark. The resolution may vary at places that require high resolution LED signs. We recommend P4 LED modules offering 4mmpitch for very near viewing distance. When talking about outdoor LED advertising, P8 (8mm pitch) or P10 (10mm pitch) remains good enough for short or near viewing distance. P 16 offering 16mm pitch is a suitable option for far viewing purpose.
Rest assured if you want LED signs with synchronous control card or asynchronous control cards. Don’t panic we will guide you what are they actually.
In very easy terms your LED billboard will display exactly the same thing that your computer will display. There are three main components involved: sending card, receiving card and the software. When a sending card is inserted in the computer and the receiving card in the screen a connection is created. Whatever changes you require, simply edit it via software. Once you agree with the displaying content you can transfer it through sending card. The screen will telecast the content on receiving all data input. Synchronous system LED display heavily relies on functioning computer. If the computer fails to operate the LED display screens are useless.
Outdoor LED displays that will employ asynchronous control cards to remain independent of the operational computer. Such LED displays have both storage and auto play function. It never relies on the computer since the memory function is by default existent in the sending card. You can find the memory card in the cabinet. The data transfer takes place via a computer. It may or may not require any cables. Other modes of transfer involve 3G, Wi-Fi, SD card, USB thumb drive or Ethernet cables. The sending card programs will then be transmitted to the receiving card. And the screens will automatically display the content. There is literally no problem even if the computer system crashes or fail to operate. One distinctive feature of Asynchronous LED displays is that they can support multiple screen network.
The other name of grayscale is color scale. It mentions the brightness level of degree of light. When talking about digital display technology color scale or grayscale is the deciding element of display colors count. Describing generally, higher grayscale denotes rich color display. Since the LED billboard screen is too delicate higher gray scale can reveal many details.
The gray scale level heavily depends on the A/D conversion of the system. It is quite obvious that the LED display system’s transmission, memory, and video processing chip must provide associated digital support. Nowadays, 8-bit processing system i.e. 256(28) color scale or grayscale is majorly used in domestic LED billboards and LED signs. In simple terms, it means that 256 brightness changes are available while going black to white. If you employ Tricolor RGB light emitting diodes you can have around 256256, 256, 16777216 range of colors. However, the International brand display screen primarily uses 10-bit processing system i.e. 1024 grayscale. The RGB tricolor can deliver 1.07 billion colors.
We agree that grayscale or color scale is a decisive parameter but that really doesn’t mean that unlimited brightness variation is better. Why? Because the human eye resolution is very limited. Any enhancement in processing bits of the system will impact transmission, storage, video processing, scanning and much more. Normally commercial and civil products use the 8-bit system while broadcast products use 10-bit processing system.
Luminance level means the brightness of an image that a normal human eye can differentiate between black to the white image. As discussed above different screens have different grayscale ranging between 256-1024. However, the human eye has limited vision capacity regarding brightness. Therefore it cannot recognize these varying gray levels. That is why many adjacent gradations of color scale may appear the same to the human eye. Also, brightness may appear different to different people depending on their visual ability.
LED billboards and LED screens, fortunately, offer improved recognition. The more the recognition to the human eye is the better it would be. Why? Because the entire content is for the people to see. The additional light a human can witness, the greater the screen’s shade/color space and the greater color richness. Do you know that there is special software to detect and assess luminance discrimination level? It is still good even if the luminance exceeds 20 levels.
The recent years were very positive with respect to pollution control campaigns. Many countries do realize their corporate social responsibility towards the environment. Steps are taken to mitigate the problem as much as possible. We surely agree that LED signs and LED products are more environment friendly as compared to conventional signs. However here we will be discussing more about light pollution, a relatively new concept.
Illuminating of the night sky occurred by man-made sources and street lights. It has a disturbing influence on natural cycles and obstructs the observation of planets and stars.
Light pollution not only disturb astronomers but it also impacts normal people. Therefore while buying any Outdoor LED display screen it is essential to consider light pollution. LED billboard or LED display should be designed in such a way that it has proper measures of preventing and controlling light pollution.
Always pick the LED display integrated with the circuit chip of industrial grade. Ensure that the chip is capable of operation between 40 ° C and 80 ° C. This is to avoid the LED sign 4-way chip from starting up particularly in winters when the temperature drops low.
Rest assure that the joint or connection between the screen and frame is absolutely leak-proof and waterproof. The screen should have efficient drainage mechanism, and if water accumulates it can be smoothly drained.
Don’t forget to check the ventilation equipment too. A proper ventilating mechanism should be present to keep the temperatures somewhere between -10 °C and 40 °C. An axial fan should always be present at the rear side of LED screens. This is to dissipate heat and prolong the useful life of the LED display