Circuit arrangement for producing an A.C. voltage for driving a pane or panel having a variable light transparency
US5724238A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1996 |
| Grant date | Mar 3, 1998 |
| Priority date | — |
| Expiry date | Dec 2, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/13306
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A power supply circuit generates an alternating driving voltage for switching a pane or panel between a transparent state and a substantially opaque state. The pane or panel is, for example, a window with a variable transparency in an aircraft cabin divider. The circuit converts a D.C. voltage that is available, for example, from the aircraft's on-board power supply, into a positive and negative D.C. voltage. These voltages pass through a push-pull output amplifier that is under the control of a clock signal generator to produce the alternating driving voltage at the output of the push-pull amplifier connected to transparent electrodes of the pane or panel that contains liquid crystals. Status sensors may influence the operation of the clock signal generator and/or of the push-pull amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.