17/08/2021
How to choose the right LED screen?
When thinking about how to choose the right LED screen solution, there are a variety of factors to consider and it is essential for you to know certain basics. We also suggest that you do more research on LED screen technology and turn to professionals and reliable resources for more support and information. Below are some basic information and terms for you to consider.
1. Indoor vs Outdoor
An indoor LED display screen is very different from an outdoor LED Display Screen. They have different viewing angles, brightness, power requirements, and durability. Outdoor LED displays are weather-proof, extremely bright, and if properly designed can handle all of nature’s elements, including full sun.
2. Type of content displayed on the screen
Determining the type of media and information displayed on your LED screen will allow the manufacturer and supplier to assess the necessary steps between the pixels of the LED screen and its characteristics. When you plan the budget for a LED screen you need to consider the content displayed on the screen or your purchase might prove to be disastrous.
3. Pixel pitch of the LED screen
The choice of the pixel pitch and the LED screen resolution dictates the physical limitations of the screen size, viewing distance, viewing angles, and of course, the budget. The cost of the screen is determined by its resolution and area. In order to produce high-quality videos on a large screen, you need to purchase the screen with the highest resolution possible under your budget. The screen resolution is defined as the total number of vertical and horizontal pixels.
4. Brightness and viewing angles
The unit of measurement of the brightness of the LED screen is nit (cd/m2). The higher the value, the higher the brightness of the screen. The brightness for indoor screens should be no more than 1,500 – 2,500 nits. For outdoor screens, the brightness should range from 3,500 nits (for screens without direct exposure to the sun) up to 10,000 nits (when the screen is directly exposed to the sun). Brightness is measured at a normal angle to the screen.
The viewing angle is usually determined by the point where the screen’s brightness is 50% of the maximum. You should notice a change in brightness as you walk along the length of the screen. LED screens have a problem unique to this technology, called “shoulder obstruction”, i.e., when the color change occurs because one LED blocks another LED at critical viewing angles. Viewing angles should include color changes. If a significant color change occurs before the brightness drops to 50%, then that is considered as the viewing angle. The addition of visors between rows of LEDs reduces the illumination of the screen by other light sources, thereby increasing the contrast. This method also reduces the vertical viewing angle, but that is not usually a problem for most LED screen applications.
5. Minimum and maximum viewing distances
Minimum viewing distance can be calculated as pixel pitch x 750-1000. At this distance, a smooth image is observed. Closer inspection of the video will lead to a “decay” of the image into separate pixels. For example, for a LED screen with a pixel pitch of 10mm, the minimum viewing distance is 10mm x 1000 = 10m.
The formula to calculate the maximum viewing distance is generally Screen Height x 20-30. For example, for a LED screen with a height of 4.56 meters, the distance will be 4.56m x 30 = 137m.
