“How do you determine when a display needs to be replaced due to visual degradation?”
This answer is provided specifically around the replacement needs of television units that we use as display devices due to visual degradation. Behind the screens, there is a subtler layer of media player replacement.
There are two parts to this:
- Analytical: Using industry data on lifecycle of display screens and “Accelerated Life Testing (ALT)” data around the specific models of screen technology, we could come up with an average lifespan for TV screens. The on-off cycle programmed into your digital screen would also need to be incorporated. This, paired with production and deployment dates, we can figure out an average life expectancy. This lifespan is used as a leading indicator for inventory and replacement planning.
- Physical: A periodic audit of the screens for physical change in characteristics is very useful – especially if that screen is nearing its analytical lifespan. In these audits, we are looking for bad pixels on the screen or faded light shades on the screen. Sometimes, a bad burn-in on the screen due to something like a static company logo would also be something to watch out for. This is more of a lagging indicator of visual degradation.
One key thing we should not forget is that the analytical model has to be constantly enriched by the physical model that we build as more and more field replacements happen. This will help identify minor variations in lifespan for specific production runs or models in the field.