Touch panel device
US8363034B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 2011 |
| Grant date | Jan 29, 2013 |
| Priority date | — |
| Expiry date | Sep 6, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04107
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a touch panel device comprising a panel main body (4) including a grid array of transmission electrodes (2) and reception electrodes (3) and defining a touch surface (51), the transmission electrodes are connected to a transmission unit (5) for sequentially applying a drive signal to the transmission electrodes. A time constant element is connected to each transmission electrode via the corresponding lead wire to adjust an overall time constant of the transmission electrode, the time constant of each time constant element being selected to be greater as the length of the lead wire for the corresponding transmission electrode increases. Thereby, the induction noises induced in the reception electrodes owing to the drive signal conducted through the lead wires leading to the transmission electrodes can be minimized and homogenized among the different transmission electrodes, and the positional variations in the distribution of the sensitivity of touch position detection owing to the variations in the lengths of the lead wires leading to the transmission electrodes can be minimized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.