A TV receiver including a microprocessor and an on screen display on a single semiconductor chip. The OSD includes half dot logic and shifting to smooth the characters with a minimum of storage capacity required and the half dot logic is used in an edge enhancing circuit to generate a black surround....http://www.google.com/patents/US4953027?utm_source=gb-gplus-sharePatent US4953027 - OSD in a TV receiver including a window, smoothing and edge enhancing
