Liquid crystal display apparatus with touch panel
US6236386A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 21, 1998 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Dec 21, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/045
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a liquid crystal display apparatus, sampling of an A-D converter for the purpose of capturing data from a touch panel is performed at a rate that is unrelated to the AC signal applied to the LCD, and data from the touch panel is captured in a regular manner in accordance with the sampling rate of the A-D converter. An added circuit detects the transformation points of the LCD AC signal and, based on a transformation point detection signal that is output by this circuit, data of the touch panel data sampled by the A-D converter that is affected by LCD noise is discarded, so that only data not affected by LCD noise is sent to a main memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.