Touch detection device, electronic apparatus and touch detection method
US11675458B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 2022 |
| Grant date | Jun 13, 2023 |
| Priority date | — |
| Expiry date | Apr 20, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0446
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a touch detection device, an electronic apparatus and a touch detection method. Each frame of touch related data corresponding to n*m capacitive nodes is obtained by producing n*m coupled signals from encoding operations and subjecting the n*m coupled signals to multiple access accumulation process, common mode suppression process, ADC process and decoding processes. Additionally, touch location information of the n*m capacitive nodes is obtained by acquiring two consecutive frames of touch related data and performing a subtraction operation between the two consecutive frames of touch related data. Therefore, relatively high touch sensing sensitivity is achievable. Before the subtraction operation, common-mode analog voltage amounts subtracted in the common mode suppression process may be not added back for each single frame of touch related data obtained from decoding process. This avoids introduction of errors, as well as a larger circuitry area and increased power consumption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.