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US 4,375,079 AGranted
Digital data display system
AssigneeInternational Business Machines Corporation
InventorsMartin W. Ricketts, Neil A. Stubbens
Life of this patent
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AssigneeInternational Business Machines Corporation
InventorsMartin W. Ricketts, Neil A. Stubbens
Estimating the term…
A digital data display in which each display unit includes a random access, read/write character definition buffer store and a screen buffer. The character definitions and screen buffer for each picture to be displayed are constructed in a remote host central processing unit. In order to minimize the time that a user has a blank screen while new character definition and screen buffer data is sent from the c.p.u. to the display unit, this information is sent in groups relating to rows of character cells on the screen and a coherent picture is displayed growing from the top downwards, giving a roller blind effect. Data relating to the first significant row is sent initially followed by groups of character definitions and screen buffer data, the size of the groups dependent upon the characteristics of the transmission buffer.
A digital data display system in which a raster scanned display device includes a character definition buffer store and a screen buffer for storing screen definition data relating display screen areas with character definitions stored in the character definition buffer store, means for operating the display device, the character definition buffer store and the screen buffer for displaying a picture and/or text in a row and column array of cell positions on the display device, a processing unit connected to the display device through a communications link and having means responsive to a command to send character definition data and screen buffer data to the display device to present a new picture on the screen, the character definition data and the screen buffer data for a new picture being an amount of data that is ordinarily sent to the display device in a series of transmissions, wherein the improvement comprises,
A method for operating a digital data graphics display system in which a raster scanned display device includes a character definition buffer store and a screen buffer for storing screen definition data relating display screen areas with character definitions stored in the character definition buffer store, and includes means for operating the display device, the character definition buffer store and the screen buffer for displaying a picture and/or text in a row and column array of cell positions on the display device, and in which a processing unit is connected to the display device through a communications link and has means responsive to a command to send character definition data and screen buffer data to the display device to present a new picture on the screen, the method comprising the following steps,
Dependencies are inferred from the claim text.