Smart glass technology has rapidly become one of the most exciting innovations in modern architecture. From conference rooms and healthcare facilities to luxury residences, switchable glass allows designers to control privacy, light, and spatial flexibility with the touch of a button.
However, not all smart glass technologies operate the same way. The two most commonly discussed technologies are PDLC and PNLC.
Understanding the difference between these systems is essential when specifying smart glass for architectural projects.
What is PDLC Smart Glass?
PDLC (Polymer Dispersed Liquid Crystal) is the most widely known type of switchable glass.
In PDLC technology:
• When electricity is applied, the liquid crystals align and the glass becomes transparent.
• When power is turned off, the crystals scatter light and the glass becomes opaque.
PDLC has been used for many years in:
• office partitions
• conference rooms
• residential bathrooms
• healthcare privacy glass
Its primary advantage is simplicity and wide availability.
However, PDLC also has limitations in applications where fail-safe privacy is required.
What is PNLC (Reverse Switchable Glass)?
PNLC (Polymer Network Liquid Crystal) is often referred to as reverse switchable glass.
In PNLC technology the operating principle is reversed:
• When power is OFF, the glass remains transparent.
• When power is ON, the glass switches to opaque privacy mode.
This configuration offers several important benefits for architectural design.
PNLC allows glass to remain clear under normal conditions, while enabling privacy only when needed.
Key Differences Between PDLC and PNLC
| Feature | PDLC | PNLC |
|---|---|---|
| Default state | Opaque | Transparent |
| Privacy activation | Power OFF | Power ON |
| Fail-safe condition | Private | Transparent |
| Best applications | Conference rooms, partitions | Luxury architecture, glass railings, specialty design |
| Design flexibility | Standard | High-end architectural |
When Should Architects Use PDLC?
PDLC is commonly used in applications where privacy is the default requirement.
Typical examples include:
• office meeting rooms
• hospital patient rooms
• bathroom partitions
• interior glass walls
In these environments, privacy is needed most of the time, so PDLC works well.
When PNLC Becomes the Better Solution
PNLC is especially valuable in architectural situations where glass should remain visually open and transparent most of the time, but privacy may occasionally be required.
Examples include:
• luxury residential architecture
• glass railings and balustrades
• high-end commercial interiors
• hospitality design
• architectural feature walls
Because the glass remains clear when unpowered, PNLC allows designers to maintain openness while still having instant privacy when required.
A New Generation of Smart Glass
Advances in switchable glass technology continue to expand what architects can achieve with glass.
Modern smart glass systems allow spaces to become flexible, dynamic, and responsive to changing needs without sacrificing aesthetics.
Whether PDLC or PNLC is the right choice depends on the functional requirements of the project and the design intent of the architect.
Need Smart Glass for Your Project?
PriWatt® switchable glass technologies provide advanced solutions for architects, designers, and builders looking to integrate intelligent glass into modern spaces.
Our team can help you evaluate the best technology for your project.
Request a quote or technical consultation today.
