Patent ID: 6046751
Filing Date: 2000-04-04
Classification: G09G

Abstract:
A scan image generator for generating a picture screen constructed by scanning a two-dimensional pixel array using a raster-scan approach, comprising:a scanning position generator for generating a scanning position; anda plurality of pixel buffer units being organized as a circular pixel buffer having a pixel buffer unit storing pixel information of a current scanning position and other pixel buffer units sequentially storing pixel information of a plurality of scanning positions following the current scanning position;a tail pointer for said circular pixel buffer, said tail pointer pointing to the pixel buffer unit storing pixel information of the current scanning position;a head pointer for said circular pixel buffer, said head pointer pointing to a pixel buffer unit newly freed for storing pixel information of a future scanning position;wherein the current scanning position moves sequentially, and when said current scanning position moves from a first scanning position to a second scanning position, the pixel buffer unit storing the first scanning position is freed, the tail pointer is updated for pointing to the pixel buffer unit storing the second scanning position, and the head pointer is updated for pointing to the newly freed pixel buffer unit.