Pet peeve, blue backlights on LCD devices with an already poor contrast ratio and viewing angle, so you cannot see the display, and the glare drowns it out. Also the use of the teeniest tiniest display possible, with a high dot density, so you literally need a magnifier to read it. There are plenty of displays though that are tiny, yet perfectly legible, and I had a good number of OLED displays on small media players that I have no issue with, mostly because the display is a white OLED and has good contrast, Transcend and LG seem to have gotten it right, but the others.......
Then Saturday a timer, with a display with a 15 degree usable angle, so I was lying down on the grass to see the display. At least Marley the lab was happy, as she was licking, and brought a few toys to play with. She has not destroyed the fishing float yet, about the only toy that has lasted more than a day with her.