User programmable overlay facility for use with video display

摘要

A display system includes a display device that receives a video signal via a first port and user programmable overlay information via a second port. The display device includes overlay code for generating an overlay image derived from the overlay information and for simultaneously displaying a video image derived from the video signal and the overlay image on the display screen. The system further includes an overlay information source device having user I/O and means enabling a user to define the overlay information using the I/O means. An output port of the source device conveys the overlay information to the second port of the display device. The overlay information may include attribute information such as position information, transparency information, and color information. The overlay code applies the corresponding attributes to the overlay image. The port over which the overlay information is conveyed may be a USB port or a Bluetooth port.