The keypad at an office I worked at about 10 years ago had an electronic display that randomized the key positions. The display's viewing angle was artificiall

The keypad at an office I worked at about 10 years ago had an electronic display that randomized the key positions. The display's viewing angle was artificially narrowed as well. I thought that all of this was to prevent shoulder-surfing -- the wear and buildup issue never crossed my mind.