So Are You Now Ready to Buy An LED Wall?
As enticing as it might seem at the prospect of buying direct, avoid "buyer's remorse" by working with someone you trust in finding the right LED wall for your needs.
LED Walls NewsMost Read Worship Tech Director Article in 2017 Worth Second Look Absen’s Xv-Series to be Showcased at LDI: Live Outside This Week So Are You Now Ready to Buy An LED Wall? What is All the Fuss about LED Walls?
LED Walls ResourceLED Walls: A Bold and Exciting World Full of Options
LED walls deliver a range of lively moving images and backgrounds to high resolution video that offers eye popping video imagery.
It sure is exciting to think that you are about to embark on a journey that so far very few have done.
Sure, you see the flashy advertisements and a few cornerstone quality projects in the trade magazines, but how do you go about buying a LED wall?
First off, I want to dig into a few more details that were touched on in the last article I wrote on August 2, and then talk a little about the major pitfalls to avoid.
So let’s discover what the term moiré means, and how it is caused … along with horizontal lines.
The best way to “see” what it is, can be accomplished by watching this YouTube video.
The creation of moiré is by the parallel lines in both the camera’s imaging sensor and the on the LED wall. All of the LEDs are lined up in rows and columns which make lines that are set up similar to a 3-chip camera. Now we are not going to dive too deep in to the camera side of things, but the single chip vs. 3-chip camera will make a difference here, in how the LED wall looks on screen. Just like the modern LED wall has three colors per pixel, the 3-chip camera has one pixel per color at each location, where the single chip has typically groups of four sensors, two being green, one red and one blue. They are not overlapped, and there is interpolation going on in the in-between spaces on the image sensor. (The reason there are two green is the human eye is most sensitive to green light and the Bayer pattern on a single-chip camera is trying to reproduce that, like the eye does.)
Now, if you try taking a still image of the LED wall and you see horizontal lines where there is black or dark lines, that has more to do with the refresh rate of the LED wall and the camera shutter speed, as shown in the photo with this article. If you have a fast shutter speed and slow LED refresh rate – this issue shows up very distinctly – but it can be minimized or eliminated by both the quality level of LED wall and also the camera shutter speed.
So this all seems so technical and confusing, right?
Well maybe, but there are ways of minimizing the effect of moiré and lines when using a camera on an LED wall.
Latest ResourceWorship Facilities Magazine, January-February 2018
The January-February 2018 issue of Worship Facilities Magazine offers articles about the many steps a church had to take in the aftermath of a fire, and another involving a church making the jump to 4K.