Video display control system

A video display control system for displaying a video image on a screen of a video display unit which includes a plurality of display elements comprising:

• (a) memory means, having a plurality of memory locations, each said memory location corresponding to a respective display element group, each said display element group including at least one of said plurality of display elements on the screen;
• and
• (b) display control means having:
• (i) first register means for receiving area information identifying a display area that includes at least one of said display element groups, (ii) address generating means for generating first address data indicative of a first memory location among said plurality of memory locations in said memory means, in accordance with said area information, said first memory location corresponding to one of a display element group or groups in said display area, wherein said address generating means comprises instruction memory means for storing a predetermined instruction and control means responsive to said area information for executing said instruction to generate said first address data, and (iii) memory accessing means for accessing said first memory location in accordance with said first address data.

A video display control system for displaying a video image on a screen of a video display unit which includes a plurality of display elements comprising:

• (a) memory means, having a plurality of memory locations, each said memory location corresponding to a respective display element group, each said display element group including at least one of said plurality of dispaly elements on the screen;
• and
• (b) display control means having:
• (i) first register means for receiving area information identifying a display area that includes at least one of said dispaly element groups, (ii) address generating means for generating first address data indicative of a first memory location among said plurality of memory locations in said memory means, in accordance with said area information, said first memory location corresponding to one of a display element group or groups in said display area, wherein said address generating means further generates, in accordance with said area information, second address data indicative of the remainder of said plurality of memory locations, said memory accessing means further accessing the remainder of said plurality of memory locations in accordance with said second address data, and (iii) memory accessing means for accessing said first memory location in accordance with said first address data.

A video display control system for displaying a video image on a screen of a video display unit which includes a plurality of display elements comprising:

• (a) memory means, having a plurality of memory locations, each said memory location corresponding to a respective display element group, each said display element group including at least one of said plurality of display elements on the screen;
• and
• (b) display control means having:
• (i) first register means for receiving area information identifying a display area that includes at least one of said display element groups, (ii) address generating means for generating first address data indicative of a first memory location among said plurality of memory locations in said memory means, in accordance with said area information, said first memory location corresponding to one of a display element group or groups in said display area, wherein said first memory location stores a first image data in advance and said display control means further comprises second register means for receiving a second image data, and operation means, said memory accessing means further reading said first image data from said first memory location indicated by said first address data, said operation means effecting a certain operation on said first and second image data to output third image data represented by the result of said operation, said memory accessing means further writing said third image data into said first memory location, and (iii) memory accessing means for accessing said first memory location in accordance with said first address data.

A video display control system for displaying a video image on a screen of a video display unit which includes a plurality of display elements comprising:

• (a) memory means, having a plurality of memory locations, each said memory location corresponding to a respective display element group, each said display element group including at least one of said plurality of display elements on the screens;
• and
• (b) display control means having:
• (i) first register means for receiving area information identifying a display area that includes at least one of said display element groups, (ii) address generating means for generating first address data indicative of a first memory location among said plurality of memory locations in said memory means, in accordance with said area information, said first memory location corresponding to one of a display element group or groups in said display area, wherein said first memory location stores a first image data in advance and said display control means further comprises second register means, said memory accessing means reading said first image data from said first memory location and storing the read first image data into said second register means, and (iii) memory accessing means for accessing said first memory location in accordance with said first address data.

A video display control system for displaying a video image on a screen of a video display unit which includes a plurality of display elements comprising:

• (a) memory means, having a plurality of memory locations, each said memory location corresponding to a respective display element group each said display element group including at least one of said plurality of display elements on the screen;
• and
• (b) display control means having:
• (i) first register means for receiving area information identifying a display area that includes at least one of said display element groups, (ii) address generating means for generating first address data indicative of a first memory location among said plurality of memory locations in said memory means, in accordance with said area information, said first memory location corresponding to one of a display element group or groups in said display area, (iii) memory accessing means for accessing said first memory location in accordance with said first address data, to read a first image data from said first memory location, (iv) second register means for receiving a second image data, and (v) comparing means for comparing said first image data read from said first memory location with said second image data stored in said second register means to output a comparison result, said memory accessing means further reading a third image data from one of said plurality of memory locations exclusive of the accessed memory location in accordance with said comparison result.

A video display control system for displaying a video image on a screen of a video display unit which includes a plurality of display elements comprising:

• (a) memory means, having a plurality of memory locations, each said memory location corresponding to a respective display element group, each said display element group including at least one of said plurality of display elements on the screens;
• and
• (b) display control means having:
• (i) first register means for receiving area information identifying a display area that includes at least one of said display element groups, (ii) address generating means for generating first address data indicative of a first memory location among said plurality of memory locations in said memory means, in accorandce with said area information, said first memory location corresponding to one of a display element group or groups in said display area, wherein said screen is composed of M columns and N rows of display elements, said display area defined by said area information being composed of X columns and Y rows of display element where 1.ltoreq.X.ltoreq.M and 1.ltoreq.Y.ltoreq.N, and said area information comprises first data indicative of column and row positions of a display element disposed at one corner of said display area, second data indicative of number of display elements on a row of display elements within said display area, and third data indicative of number of display elements on a comlumn of display elements within said display area, and (iii) memory accessing means for accessing said first memory location in accordance with said first address data.

A video display control system for displaying a video image on a screen of a video display unit which includes a plurality of display elements comprising:

• (a) memory means, having a plurality of memory locations, each said memory location corresponding to a respective display element group, each said display element group including at least one of said plurality of display elements on the screen;
• and
• (b) display control means having:
• (i) first register means for receiving area information identifying a display area that includes at least one of said display element groups, (ii) address generating means for generating first address data indicative of a first memory location among said plurality of memory locations in said memory means, in accordance with said area information, said first memory location corresponding to one of a display element group or groups in said display area, wherein said area information comprises a first data representative of one of said display elements and a second data representative of another one of said dispaly elements, said display elements forming a straight line lying between said one of the display elements and said another one of the display elements, and (iii) memory accessing means for accessing said first memory location in accordance with said first address data.