Basics · 5 min read
What is PDLC switchable glass?
Switchable glass — also called smart glass or privacy glass — is glass that can change from frosted and private to crystal clear at the flick of a switch. No blinds. No curtains. Just glass that does the job on its own.
The technology that makes this possible is called PDLC.
What does PDLC stand for?
PDLC means Polymer Dispersed Liquid Crystal. It's a wafer-thin film made of tiny liquid-crystal droplets suspended in a clear polymer, sandwiched between two transparent conductive layers. This film is either laminated inside a glass panel or applied as a self-adhesive film onto glass you already have.
How does it actually work?
- Power OFF: the liquid crystals are scattered randomly. They bounce light in every direction, so the glass looks translucent white — you get privacy and soft, diffused daylight.
- Power ON: apply a low voltage and the crystals instantly line up. Light passes straight through and the glass turns clear — in under a second.
Because it defaults to private when there's no power, a power cut simply leaves your glass frosted. You're never accidentally left exposed.
Is it safe and expensive to run?
Yes and no — it's very safe and very cheap to run. PDLC glass works on a safe, low-voltage transformer and draws only about 5 watts per square metre — less than a single LED bulb. Laminated versions also hold together if the glass is ever broken, just like a car windscreen.
Where do people use it?
Everywhere they'd otherwise fight with blinds:
- Office cabins and boardrooms that need instant meeting privacy
- Hospital ICUs and consultation rooms (far more hygienic than cloth curtains)
- Bathrooms, skylights and balconies at home
- Retail storefronts that turn private after hours
The bottom line
PDLC switchable glass gives you the openness and light of glass with privacy you control instantly. It's cleaner than blinds, smarter than curtains, and — as prices in India have fallen — increasingly affordable.
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