Keyboard activated screen blanking
US5173940A · kind A · utility
46Cited by
4References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1991 |
| Grant date | Dec 22, 1992 |
| Priority date | — |
| Expiry date | Jun 21, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2330/021
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A keyboard controller which scans entered input sequences for an input sequence to activate a display blanking feature. A password and particular hot key are loaded by the system microprocessor. The keyboard controller then scans until the designated sequence is activated. The display on the monitor is blanked until a password sequence is entered. The password mode may be directly activated from the system microprocessor. The display blanking feature is especially useful in conjunction with a keyboard password lock.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.