ALEXANDRIA, Va., Sept. 3 -- United States Patent no. 12,405,414, issued on Sept. 2, was assigned to OMRON Corp. (Kyoto, Japan).
"Display device and game machine" was invented by Mitsuru Okuda (Kyoto, Japan) and Yasuhiro Tanoue (Kyoto, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A minimum display unit forming a pattern, displayable by a light guide plate of a display device, has first and second prisms with reflective surfaces in a curved surface shape that is convex relative to an incident surface of the light guide plate. The first and second prisms are configured such that a ratio of light quantities from first and second light sources having different emission colors into the light guide plate, r...