Liquid crystal eWriter system with resistive digitizer and having mechanical palm rejection
US10649261B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 2017 |
| Grant date | May 12, 2020 |
| Priority date | — |
| Expiry date | Dec 12, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2380/14
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A liquid crystal eWriter system with a resistive digitizer and having palm rejection includes the following features. An eWriter includes eWriter substrates that are spaced apart from each other, an upper one of the eWriter substrates being formed of a flexible, clear polymeric material and a lower one of the eWriter substrates being formed of a flexible polymeric material. Electrically conductive layers are spaced apart from each other and located between the eWriter substrates. A dispersion layer including a dispersion of cholesteric liquid crystal material and polymer is disposed between the electrically conductive layers. Pressure applied to the eWriter changes a reflectance of the cholesteric liquid crystal material forming an image. A resistive digitizer determines a location of the pressure applied to the eWriter. The system is designed so that the resistive digitizer detects fingernail or stylus input with substantially no lightly written stroke loss but detects substantially no palm input, under ordinary writing conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.