US Patent Issued to Japan Display on June 3 for "Lighting device" (Japanese Inventors)

ALEXANDRIA, Va., June 4 -- United States Patent no. 12,320,497, issued on June 3, was assigned to Japan Display Inc. (Tokyo).

"Lighting device" was invented by Masafumi Okada (Tokyo), Nobuyuki Suzuki (Tokyo) and Makoto Hasegawa (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "The incident surface is the inner surface of a recess including a bottom surface and an inwardly convex inner side. A tangent line on the free-form curve forms a smaller angle with the optical axis at a point closer to the bottom surface and a larger angle with the optical axis at a point farther from the bottom surface. The free-form curve has a curvature that is not constant. The curvature is maximized at a depth of one-third or ...