BLACK. PRINTED. SMART.

Next-Generation Printable Black Electrochromic Film for Automotive Glass

Our Product

BLACK. PRINTED. SMART.

A printable black electrochromic film developed by the National Institute of Advanced Industrial Science and Technology (AIST) switches from transparent to deep black at about 1.5 V. The water-based nanoparticle ink enables simple, vacuum-free coating.

01
PRINTABLE
Scalable Manufacturing
02
BLACK-to-CLEAR
0.1–80% Visible Transmittance
03
SMART FOR MOBILITY
Automotive Roofs・Side Windows

Description of the products

Glass That Adapts to Sunlight on Demand.

AIST's proprietary water-based nanoparticle ink technology, for which patent applications have been filed, enables fabrication without vacuum deposition and is compatible with existing coating and printing equipment, with potential for roll-to-roll production of large-area films. Other smart-window approaches often involve trade-offs in color, transparency, power use or manufacturing complexity.

AIST differentiates its technology by combining deep-black appearance, low-voltage operation, energy efficiency and scalable coating-based manufacturing.

Its integrated expertise spans material design, nanoparticle synthesis, ink formulation, coating, film formation and device design for smart glass use.

AIST is developing this technology for automotive sunroofs, side windows and partitions, where switching from transparency to deep black can improve privacy, reduce glare and solar heat gain, and expand design freedom.

This patented heat‑management design resolves conventional heat‑balance issues and substantially improves profitability, especially where labor and transport costs account for nearly 70% of total biochar production expenses. By enabling autonomous, distributed carbonization of unused biomass directly at forestry and agricultural sites, Pyro‑X accelerates the formation of a decentralized biochar economy while supporting carbon sequestration, soil regeneration, and sustainable resource management.

A one-square-meter printed film has demonstrated switching within 60 seconds at about 1.5 V. By limiting solar heat entering a vehicle, the film can help reduce the air-conditioning load; its low-voltage operation and memory characteristics are particularly relevant to EVs.

Because the electrochromic material is formulated as a water-based nanoparticle ink, it can be applied through coating and printing rather than vacuum deposition, supporting large-area and continuous production.

Applications

Expanding the Possibilities of Glass.

Switchable transparency offers new options for privacy, glare control, solar heat management, and design across a range of spaces and mobility applications.

Automotive Sunroofs
Can help reduce solar radiation and glare for greater cabin comfort.
Automotive Side Windows
New possibilities for privacy and exterior design.
Interior Partitions
Helps manage visibility to suit different spaces and uses.
Architectural Smart Windows
Potential for solar control and design in architectural glazing.
Rail and Aviation
Potential development for window systems that support passenger comfort.
Displays and Design Components
Exploring applications in design components and other elements with a changeable appearance.

About Us

Advanced Control of Heat Transfer with Understanding the Phenomenon from both Theoretical and Experimental Perspectives for Effective Use of Thermal Energy

Technologies for optimal heat control still have a way to go compared to electricity. This area is promising from both academic and engineering perspectives. Thermal energy often goes to waste and is released to the environment unused. We are conducting a wide range of research on thermal energy technologies to utilize smartly heat, including “Mottainai” waste heat. By fully utilizing heat, we will help promote the efficient use of energy.

BLACK. PRINTED. SMART.