The present invention provides a low cost OSD system with minimal ROM requirements, minimal computing power required from the microcontroller, and minimal I/O port requirements. The OSD system creates a fixed frame around a small set of programmable characters. The small set of programmable characters...http://www.google.de/patents/US7158139?utm_source=gb-gplus-sharePatent US7158139 - Simple on screen display system using mapped ROM generated characters
