Handwritten character input device
US4723836A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 1984 |
| Grant date | Feb 9, 1988 |
| Priority date | — |
| Expiry date | Oct 10, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/046
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A handwritten character input device includes an opaque tablet or digitizer for inputting a handwritten character or figure into an apparatus. The tablet is of an electromagnetic induction type. The tablet is positioned under a liquid crystal display panel and an aluminum-evaporated film reflector is provided for the liquid crystal display. Preferably, the aluminum-evaporated film reflector is as thick as 1.0 micron or less. A conductive shield plate may be further provided between the tablet and a driving circuit substrate for the liquid crystal display panel. This shield plate serves to magnetically isolate the tablet from the driving substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.