What is PDLC Film?
A complete guide to Polymer Dispersed Liquid Crystal glass technology — the science behind instant switchable privacy.
Get a PDLC QuoteThe Science of PDLC Glass
PDLC stands for Polymer Dispersed Liquid Crystal. Inside every PDLC film is a layer of microscopic liquid crystal droplets — each only a few microns in diameter — randomly suspended inside a solid polymer matrix.
When no voltage is applied, these droplets are oriented randomly. Incoming light rays strike these crystals at many different angles, scattering the light rather than allowing it to pass through — producing a milky, opaque appearance that blocks all visual privacy.
When low-voltage AC electricity (48–65V) is applied, an electric field is generated across the film. The liquid crystals instantly align parallel to each other along the electric field lines. In this aligned state, light passes straight through the crystals without scattering — making the glass appear completely transparent.
The entire transition happens in approximately 50 milliseconds — essentially instantaneous to the human eye. Unlike electrochromic glass which slowly tints, PDLC is a binary switch: fully opaque or fully transparent.
| PDLC Film Technical Specifications | |
|---|---|
| Technology | Polymer Dispersed Liquid Crystal (PDLC) |
| Switch Speed | ~50 milliseconds |
| Operating Voltage | 48–65V AC |
| Power Consumption | 3–5 W/m² (on state only) |
| Film Thickness | 0.4mm (standard) |
| UV Blocking | ≥99% |
| Visible Light Trans. | ~75% (on) / <5% (off) |
| Haze (off state) | ≥95% |
| Operating Temp. | -20°C to +70°C |
| Switch Cycles | 100,000+ |
| Adhesive Type | Self-adhesive / Laminated |
| Custom Sizes | Yes — cut to any dimension |
PDLC Film: Two States, One Glass
PDLC glass operates in two distinct modes controlled by a simple electrical switch, app, or automation system.
OFF State — Opaque (Private)
- No electricity flowing to the film
- Liquid crystals randomly oriented
- Light scattered — glass appears milky white
- Complete visual privacy — nothing visible through glass
- Zero power consumption in this state
- UV rays still blocked
- Default "fail-safe private" state
ON State — Clear (Transparent)
- Low-voltage AC applied (48–65V)
- Liquid crystals align with electric field
- Light passes through unimpeded
- Up to 75% visible light transmission
- 3–5 watts per m² consumed
- Glass looks and behaves like normal window
- Can double as rear-projection screen when off
PDLC vs. Electrochromic Glass
Many buyers confuse PDLC with electrochromic glass. They are fundamentally different technologies.
| Characteristic | PDLC Film | Electrochromic Glass | SPD / LCD Glass |
|---|---|---|---|
| Switch Mode | Binary (clear / opaque) | Gradual tint | Variable tint |
| Full Opacity | Yes — Complete white opacity | No — Never fully opaque | No — Never fully opaque |
| Switch Speed | 50 milliseconds | 1–5 minutes | ~100ms (tint) |
| Power (clear state) | 3–5 W/m² | <1 W/m² | 5–10 W/m² |
| Privacy (off state) | Yes — Complete | No — Partial tint only | No — Partial tint only |
| Retrofit / Self-Adhesive | Yes — Yes | No — Integrated only | No — Integrated only |
| Projection Screen Use | Yes — Excellent | No — No | No — No |
| Relative Cost | Yes — Competitive | High | Very High |