Touch panel
US4990900A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 9, 1988 |
| Grant date | Feb 5, 1991 |
| Priority date | — |
| Expiry date | Jun 9, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/045
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A touch panel having a panel body formed by transparent upper and lower electrodes spaced a predetermined distance. The touch panel is mounted on a front surface of a display device to detect a coordinate at a depressed position on the upper electrode. The improvement comprises a transparent insulating liquid material filled between the upper and lower electrodes and a coloring agent containing pigment or dyestuff dispersed in the liquid material. In another aspect, the improvement comprises a transparent insulating liquid material filled between the upper and lower electrodes and an insulating fine powder dispersed in the liquid material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.