Readout apparatus and multi-channel readout apparatus for touch panel
US8274489B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 17, 2009 |
| Grant date | Sep 25, 2012 |
| Priority date | — |
| Expiry date | Apr 16, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/04166
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A readout apparatus and a multi-channel readout apparatus for a touch panel are provided to integrate different types of readout circuit. The readout apparatus set to a first mode reads the touch panel with a small amount of charges through an integrator. The readout apparatus set to a second mode reads a sensing current of a current type touch panel through a current to voltage converting unit and an inverting amplifier, so as to save a chip area. The multi-channel readout apparatus set to a third mode applies multiple channels to alternatively share an integrator to read the touch panel with a large amount of charges, so that an amount of feedback capacitors (integral capacitors) having a great area can be greatly reduced. Therefore, readout apparatus of the present invention can not only reduce a chip area, but can also be applied to various types of the touch panel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.