Patent ID: 6954210
Filing Date: 2005-10-11
Classification: G09G

Abstract:
1. A display data generating device comprising: a memory device having memory areas allotted thereto and each storing, for each pixel, pixel data to be displayed on pixels of a display screen so that pixel data corresponding to a predetermined number of successive pixels are accessible at once; an address converting unit that receives pixel coordinates of the display screen in sequence to convert each of the received pixel coordinates to an address and an offset, the address designating a position of one of the memory areas in said memory device, the offset representing a position at which the pixel data is stored in a memory area which is selected according to the address; an address buffer storing therein addresses obtained from the conversions; an offset buffer storing therein offsets obtained from the conversions, in association with the addresses; an address comparing unit that compares two addresses obtained from the conversions in sequence, and inhibits the addresses from being redundantly stored in said address buffer when the addresses match with each other; a buffer controlling unit detecting that one of said address buffer and said offset buffer is full; and a pixel processing unit that modifies, in response to the detection by said buffer controlling unit, pieces of pixel data according to pieces of pixel information, respectively, in order to rewrite the pixel data stored in said memory device according to the pieces of pixel information, the pieces of pixel data corresponding to a plurality of addresses read from said memory device, the pieces of pixel information being inputted in correspondence with the pixel coordinates.