ALEXANDRIA, Va., June 6 -- United States Patent no. 12,283,442, issued on April 22, was assigned to Apple Inc. (Cupertino, Calif.).
"One-way visibility keycaps" was invented by Shravan Bharadwaj (San Jose, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "Keyboards and other electronic input devices have a key or keys with glyphs that are invisible to an unaided human eye in a first condition, such as when an underlying display attached to the key is not emitting light. The glyphs are visible through the key or keys when the display emits light. A one-way visibility layer or structure obscures the visibility of the display when viewed from above, but when the display emits light, the light penetrates thr...