Technical Notes
Notes on switchable film and multi-zone control, written from the side that designs the controller. We cover the things that are easy to get wrong early and hard to change later — and that catalogues tend not to mention.
Our technical articles have moved to the Technical Notes on our blog. This page keeps the earlier notes and the calculator.
Published 2026-09-04 · Updated 2026-09-15
The same film can last for years or scorch in a day, depending on the drive waveform. Four causes of degradation — DC component, excess voltage, ripple and boundary field concentration — with the mechanism and the fix for each.
Published 2026-08-21
Some switchable films go opaque when you cut the power; others go clear. The choice decides what the glass does in a power failure — and how many hours a day it is drawing current.
Published 2026-08-20 15:33 · Updated 2026-08-20 15:46 (JST)
The “◯ W/m²” on a datasheet is not a constant of the film. The same film draws different power depending on the frequency the controller drives it at — and that decides your supply capacity and drivable area.
Published 2026-08-20 · Updated 2026-08-21
Nothing conducts sideways through switchable film, yet driving one zone puts a voltage across its neighbours. The coupling runs through the shared common electrode — and that one fact decides how far it reaches.
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