Patent ID: 7623140

Claim:
A method of generating an output image based on a first image and a second image, the method comprising: determining whether a first display position on a display panel at which a pixel of the output image is to be displayed is within an active display region of the display panel; performing active display processing to generate the output image if the first display position is within the active display region of the display panel; and performing blanking processing to generate the output image if the first display position is not within the active display region of the display panel; wherein performing active display processing comprises: performing selective display processing if the first image and the second image are not both active at the first display position; and performing composite display processing if the first image and the second image are both active at the first display position; wherein performing composite display processing comprises: selecting, as the pixel of the output image, either a pixel of the first image, a pixel of the second image, or a blending of the pixel of the first image and the pixel of the second image, based upon a processing control input, the processing control input indicating whether the first image is transparent or opaque, whether the second image is transparent or opaque, and whether the first image is on top of the second image.