Circuit for detecting touch point location on a touch panel, touch panel and display device
US9542900B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 7, 2013 |
| Grant date | Jan 10, 2017 |
| Priority date | — |
| Expiry date | Sep 20, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2310/0272
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit for detecting a touch point location on a touch panel, a touch panel and a display device for improving the precision of touch point location on the touch panel are disclosed. The circuit for detecting a touch point location on a touch panel comprises: a sensing sub-circuit, an amplification sub-circuit connected to the sensing sub-circuit, an output sub-circuit connected to the amplification sub-circuit, a detection sub-circuit connected to the output sub-circuit, and a first touch drive electrode line. The sensing sub-circuit comprising a fixed capacitor, a variable capacitor, and a first switch transistor, wherein a gate terminal and a source terminal of the first switch transistor are connected to the first touch drive electrode line, a drain terminal of the first switch transistor is connected to a terminal of the fixed capacitor, a terminal of the variable capacitor is connected to the other terminal of the fixed capacitor, the other terminal of the variable capacitor is connected to a reference voltage, and the amplification sub-circuit is connected to the terminal of the fixed capacitor that is connected to the variable capacitor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.