Liquid crystal display with pen-input capability
US5243452A · kind A · utility
10Cited by
7References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1991 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | Dec 6, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/042
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a liquid-crystal display, each pixel is associated with a sensor which detects incoming light projected by a light pen. In response to the detected light, the sensor produces a signal which causes its associated pixel to darken. Thus, as a user moves the light pen along the display, the pen leaves a trail of darkened pixels, analogous to a pen leaving a trail of ink on paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.