Number "1" in hundreds' place not as bright as the other 2 digits

It seems that the vacuum fluorescent displays in our car take a significant length of time in-use to reach full brightness - and/or segments or pixels that are infrequently used don't illuminate as brightly as those that are frequently used. Over a longer period of time, however, the phosphorous used may begin to lose efficiency, and the more frequently used segments will appear dimmer than lesser used.

I've noticed that areas of my HSD that are frequently used are brighter than ares that are not because I'm always on the view with the energy bar. As your odometer increments, you'll notice portions of that view are brighter than others over time. You may even observe that the bottom few segments of your gas gauge may be brighter over time than the top bar.

There have been several other threads on this. Normal? In dash display color seems faded?? | PriusChat is one of them.