Patent ID: 6661426
Filing Date: 2003-12-09
Classification: G09G,H04N

Abstract:
On screen display generation apparatus comprising:two or more independent sources of data for display; a windows controller arranged to generate and periodically update a respective display panel for each source based at least partially on data from that source; first storage means holding data for generated display panels including specification that :at least a part of one panel is translucent; and display controller configured to generate output pixel values for display based at least partially on contributions from two or more of said display panels, with certain pixels having contributions from two display panels where a first panel is positioned to at least partially overlie a second and the overlying part of the first panel is specified as translucent, wherein the windows controller is arranged to generate each display panel as a first portion and a second, attached, portion with only one of the first and second portions being specified as translucent and wherein one of said sources comprises a source of video image frame sequences and the display panel for that source displays the video image frames in the portion other than that specified as translucent.