Browse Prior Art Database

Dynamic Picture Overlay with TV Raster Scan

IP.com Disclosure Number: IPCOM000080387D
Original Publication Date: 1973-Dec-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Belady, LA: AUTHOR [+2]

Abstract

An interactive terminal, system having one or more displays of the TV raster scan type. is arranged so that one set of interleaved scan lines (for example, the odd-numbered lines) is utilized for displaying the dynamic or changeable information, and the other set of scan lines (e.g., even-numbered lines) is allocated to static background information.

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Dynamic Picture Overlay with TV Raster Scan

An interactive terminal, system having one or more displays of the TV raster scan type. is arranged so that one set of interleaved scan lines (for example, the odd-numbered lines) is utilized for displaying the dynamic or changeable information, and the other set of scan lines (e.g., even-numbered lines) is allocated to static background information.

The illustration shows an implementation comprising display terminals of the raster scan type arranged to receive dynamic picture information from direct- access memory boxes, called "main memory", and background picture information from a "support memory", which can be a magnetic drum or disk storage unit or some external video source such as a video cassette. During that phase of each refresh cycle in which the odd-numbered lines of the raster are refreshed, the dynamic information is displayed. During the phase of the cycle in which even-numbered lines are refreshed, the static background information is displayed.

There are no limitations on the lateral positioning of the picture elements in either set of scan lines. The display as a whole may give the impression that the dynamic picture is being overlaid upon the background picture, or vice versa. The background information can be switched for any desired distribution. Each terminal could have a unique background picture, or several terminals could display the same background picture combined with different dynamic pict...