Driving thin film switchable optical devices
US10520785B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 2018 |
| Grant date | Dec 31, 2019 |
| Priority date | — |
| Expiry date | Jan 19, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2001/1555
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Controllers and control methods apply a drive voltage to bus bars of a thin film optically switchable device. The applied drive voltage is provided at a level that drives a transition over the entire surface of the optically switchable device but does not damage or degrade the device. This applied voltage produces an effective voltage at all locations on the face of the device that is within a bracketed range. The upper bound of this range is associated with a voltage safely below the level at which the device may experience damage or degradation impacting its performance in the short term or the long term. At the lower boundary of this range is an effective voltage at which the transition between optical states of the device occurs relatively rapidly. The level of voltage applied between the bus bars is significantly greater than the maximum value of the effective voltage within the bracketed range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.