My first "job" between school and university was to assemble a bunch of keyboards for banking terminals. They used configurable key caps in that a printed sheet

My first "job" between school and university was to assemble a bunch of keyboards for banking terminals. They used configurable key caps in that a printed sheet was snapped under a transparent keycap cover. I suppose I must have been working on a short production run for a small bank or a trial project, that didn't merit screen printing the keys. As I worked through countless of those keyboards I mused that what it needed was a little screen on each keycap, so I could just do my job using software. This was in 1982. Seems like we're nearly there.