Collimation is a method of focusing light on a center point to make it appear brighter. A crude example would be like placing a paper towel roll over a flashlight to direct all the light to a much smaller point.
Collimation is great for head-on viewing – images will appear vivid and bright. However, you’ll experience a significant luminance drop-off as you move off angle from the focus point. Many displays designed for 2000 nit brightness, actually mean 2000 nits when viewed head-on. In almost every case, collimated displays lose 30% of their luminance when viewed just 20 degrees off center. Think about the implications when viewing displays under daytime sunlight. This could make the displayed content nearly invisible.
LG-MRI displays do not use collimation to focus brightness. We use direct backlighting so we produce much better off-angle brightness – only a 5% drop when viewed 20 degrees off-center.