
US Patent No: 4,587,520
Number of patents in Portfolio can not be more than 2000
Cursor controlled page selection in a video display
Stats
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May 6, 1986
Issued date -
Apr 7, 1983
filing date -
06/482,852
serial no -
Expired
status
Importance
Abstract
A teletext system in which viewer function selection is accomplished by superposing a cursor on one of the displayed function words. The teletext/videotext receiver includes a ROM for storing page selection control symbols and a RAM for storing symbols and related addresses corresponding to all displayed page selection symbols. The RAM contents are compared with a cursor address signal to identify displayed page selection symbols that are at or near the cursor location. A page selection symbol, thus identified, is transferred from the RAM to the teletext/videotext system decoder as an information selection command in response to depression of a selection key whereby a minimum number of keys provide selection of a virtually unlimited number of system commands and a user may continuously monitor the displayed text while making selections thus reducing selection entry errors. Provision is made for altering the cursor position, shape and/or brightness upon a predetermined condition of proximity of the cursor with respect to a displayed system command symbol to verify the validity of the command to the user and to avoid positional ambiguities of the cursor relative to the displayed symbol.
First Claim
Related Publications
International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 4,354,184 Display system for localizing regions in a mixed text & picture display | 25 | 1980 | |
| 4,495,491 Method for highlighting of a region on a display screen | 36 | 1983 | |
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| 4,479,197 Method and apparatus for selecting and setting the mode of operation for a mechanism | 40 | 1982 | |
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| 4,232,311 Color display apparatus | 67 | 1979 | |
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| 4,213,189 Reactive computer system adaptive to a plurality of program inputs | 18 | 1977 | |