Touch processor circuit and touch screen system performing analog-to-digital conversion of two steps
US9973199B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2016 |
| Grant date | May 15, 2018 |
| Priority date | — |
| Expiry date | Jul 9, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/458
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A touch processor circuit includes a capacitance-to-voltage converter and an analog-to-digital converter. The capacitance-to-voltage converter converts an input signal transmitted from a touch sensor into a conversion signal corresponding to a capacitance of the touch sensor. The analog-to-digital converter digitizes the conversion signal transmitted from the capacitance-to-voltage converter and generates a digital value. The analog-to-digital converter includes a first converter, a second converter, and a combination logic circuit. The first converter calculates upper bits of the digital value based on the conversion signal during a first time period. The second converter calculates lower bits of the digital value based on a residue component signal transmitted from the first converter during a second time period. The combination logic circuit combines the upper bits and the lower bits and generates the digital value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.