Pen input to liquid crystal display
US5610629A · kind A · utility
120Cited by
27References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 14, 1994 |
| Grant date | Mar 11, 1997 |
| Priority date | — |
| Expiry date | Jul 14, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/046
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A liquid crystal display comprises multiple capacitors which apply electric fields to liquid crystal material located between the capacitor plates. In the invention, each capacitor is associated with a sensor which detects the presence of a hand-held stylus. The detection can be done optically, acoustically, by pressure, by temperature, or by other means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.