Information processing apparatus including a control circuit for controlling a liquid crystal display illumination based on whether illuminatio power is being supplied from an AC power source or from a battery
US5384516A · kind A · utility
74Cited by
3References
19Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Nov 2, 1992 |
| Grant date | Jan 24, 1995 |
| Priority date | — |
| Expiry date | Nov 2, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An information processing apparatus employs a liquid crystal display and a fluorescent lamp for backlighting the screen of the liquid crystal display. A lighting circuit for supplying alternating current lighting power to the fluorescent lamp receives input power from either a commercial alternating current power source or from a direct current battery. The level of the lighting power supplied to the fluorescent lamp is determined based upon a determination of whether the input power is being supplied from the commercial power source or from the battery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.