Projective capacitive touchscreen
US6297811A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1999 |
| Grant date | Oct 2, 2001 |
| Priority date | — |
| Expiry date | Jun 2, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0448
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An improved touchscreen utilizing two sets of electrodes that are fabricated in a single plane is provided. The individual electrodes of each set of electrodes are formed from a continuous length of a conductive material. Suitable electrode materials include fine wire and deposited conductive coatings. The overall electrode pattern is such that there is no overlap of electrodes, thus eliminating the need for insulating layers and/or coatings between electrodes. Although a variety of electrode patterns can be used, preferably the pattern is comprised of a plurality of approximately triangularly shaped electrodes, the pattern such that the base of one triangularly shaped electrode is adjacent to the apex of the next triangularly shaped electrode. The preferred triangular shape of an individual electrode can be achieved by forming a continuous loop of the electrode material into the desired shape or by forming a series of teeth of varying height, the envelope of the teeth approximating the desired triangular shape. A touchscreen sensor employing the disclosed sensing electrodes can use any of a variety of readout systems. For example, a frequency-domain readout approach can be used in…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.