DNP Develops Film for use with Laminated Glass That Brightens Rooms

Efficiently reflects and disperses natural light

Dai Nippon Printing Co., Ltd (DNP) has developed a film for use with laminated glass that effectively reflects and disperses natural light to brighten the entire room. Laminated glass attaches two sheets of glass on either side of the newly developed film, which is both strong and achieves a smooth surface. As a result, laminated glass that employs the newly developed film exhibits security features, such as being more difficult to break that standard glass, and exhibits high level resilience. At the same time, such glass is also equipped with superior daylighting functions. Sales will commence from October 2015.


DNP has positioned the environment and energy as a growth area, and is promoting activities designed to create products and services considered essential to affluent consumer lifestyles - referred to as Tomorrow's Basics.

Lighting film has been the focus of attention in recent years as an energy saving measure, and has led to power consumption reductions by being attached to windows to effectively draw in light and make rooms brighter during the daytime hours. At the same time, laminated glass, which is produced by attaching two sheets of glass together, is more difficult to break than standard glass and is therefore used for security purposes. DNP has seen demands to use lighting film in laminated glass in order to achieve brighter rooms. Currently available lighting film, however, is often scratched during the hot-press bonding process when it is inserted between the two sheets of glass. Alternatively, the micro-machined layer designed to reflect and disperse light may be damaged by the adhesive agent, resulting in a deterioration of the daylighting function.  In order to overcome this challenge, DNP has called on optical design technology developed in optical film for displays, and micro-machining technology. In addition to boosting overall resilience, and equipping the new film with security features, the Company has also successfully developed a lighting film that loses none of its daylighting functions even if used in laminated glass.

[New Product Features]

  • By creating a structure that takes the light reflective and dispersal features and positions them, not on the surface of the film, but interior to the structure, it has been possible to successfully develop lighting film with a smooth surface.
  • And by optimizing the optical properties of the materials used in the micro-machining process utilized in order to reflect and disperse light, the new film has been designed so as to facilitate the effective drawing in of sunlight and brightening of the room.
  • Tests were conducted with laminated glass using the new film in windows on the north side of houses that traditionally do not get much sunlight, and it was found that on a before-and-after-basis brightness was boosted by a multiple of two, and lighting energy was reduced by 13%.
  • Also, as the sun's ultraviolet light can be cut by 99%, it is also possible to reduce damage to the human body, house furniture and carpets.
  • Laminated glass is based on a difficult to break structure that attaches two plates of glass with the strong film in between. Existing lighting film exhibits its daylight effect via the creation of fine bumps on the surface of the film, but adhesive materials can fill in these bumps, damaging the daylighting function and making it difficult to use with laminated glass. In contrast, the new film achieves a smooth surface by creating a structure that houses the daylighting function within the film. As a result, resilience has been increased, the film is more difficult to scratch, and it is now possible to use it with laminated glass.


Examples comparing room brightness when using existing glass (at left), with laminated glass using newly developed product (at right).

[Looking Ahead]

DNP will offer this new film to standard houses, office buildings, along with educational, commercial and healthcare facilities, aiming for total sales of 3.0 billion yen by FY 2017. The Company will also promote the development of various types of lighting film that make effective use of sunlight.

* Product prices, specification and service contents mentioned in this news release are current as of the date of publication. They may be changed at any time without notice.