When the "touch screen" was invented depends on how you define the term.
For "light pen" based system, early/mid 1950's. For capacitive systems,
it's the mid/late 1960's.
>"E.A. Johnson described his work on capacitive touchscreens in a short
article published in 1965[6] and then more fully with photographs
and diagrams in an article published in 1967.[7]"
https://en.wikipedia.org/wiki/Light_pen
>"The first light pen was created around 1955 as part of the Whirlwind >project at MIT.[2][3]"
https://en.wikipedia.org/wiki/Touchscreen#History
>"E.A. Johnson described his work on capacitive touchscreens in a short article published in 1965[6] and then more fully with photographs and diagrams in an article published in 1967.[7]"