Commercialization of Optical Elastic Resin "Jettable SVR" Corresponding to Inkjet Coating
- Decisions made by multiple manufacturers to use it for their tablet PCs, and sales promotion of product for automotive displays also launched -

Product

2022.03.16

Dexerials Corporation (Headquarters: Shimotsuke-shi, Tochigi, Representative Director and President: Yoshihisa Shinya, hereinafter, “Dexerials”), which provides leading-edge technologies, materials, and devices for smartphones, automotives, and other products, announced that it has commercialized optical elastic resin “Jettable SVR” (hereinafter, “jSVR”) corresponding to inkjet coating. Multiple manufacturers have decided to adopt “jSVR” for their tablet PCs, and Dexerials has commenced shipping.

Jettable SVR

Optical elastic resin “SVR” (hereinafter, “SVR”) from Dexerials is a liquid, UV curable acrylic resin that is used to fill in the air gap between a display panel’s display area and a top plate. It is an optical clear resin (OCR/LOCA), which prevents reflection on the interface of the air gap and improves the visibility and shock resistance when it is given optical characteristics similar to those of the top plate material. Since its launch in 2007, “SVR” has been adopted for smartphones, tablet PCs, automotive displays, and other products, boasting the world’s leading market share*1.

Jettable SVR Cross-section of displays (Right: Display using optical elastic resin “SVR”)

The optical elastic resin “jSVR”, which was commercialized this time, correspond to inkjet coating, a method used mainly for printing. It thus enables optical bonding with the high-precision coating of chosen points with the appropriate amount of resin. This ensures greater workability and facilitates the coating of displays in special shapes, which have notches and punch holes for cameras and sensors.
In addition, “jSVR” permits the precise, continuous control of coating thickness. This means it can be used for 3D-shaped displays with uneven thickness, such as curved displays, for which the use of optical clear adhesive tapes with even thickness (hereinafter, “OCA”) was difficult. Further, the use of OCA involves a punching process for correcting its shape and size, generating a disposal loss. “jSVR” eliminates this loss because it permits the coating of only the desired areas with only the necessary amount of resin, reducing the environmental impact.

Dexerials developed “jSVR” in September 2020 and has since been preparing for its commercialization, such as introducing it to customers, shipping samples, and adjusting its specifications based on requests. As a result, multiple manufacturers have highly evaluated the advantages of “jSVR” and decided to adopt the product for their tablet PCs.

Dexerials has also begun to introduce “jSVR” for automotive displays. More automotive displays come in special shapes than displays of electronics products, with a wider range of required thicknesses. Therefore, Dexerials has received many inquiries about “jSVR” as the optimal solution. Automotive displays are larger than displays for electronics. This means that larger pieces of equipment are needed for inkjet coating and lamination. In January 2022, Dexerials introduced large prototyping equipment for automotive displays at its Headquarters and Tochigi Technology Center. Using this equipment, customers can do prototyping and consider the introduction of “jSVR” without introducing the equipment on their own. Using this equipment, Dexerials will expand the business proactively to products for automotive displays.

It is expected that, with the development of digital technologies and the evolution of applications, including the CASE (Connected, Autonomous, Shared & Service, and Electric) of automobiles and the spread of high-speed communication, displays will play even more important roles as devices outputting information. Dexerials will contribute to the further evolution of displays and support the digitalization of society and its shift to IoT by broadly applying the technologies it has cultivated through the creation of these products, in its efforts to help solve social issues.

Details of Optical elastic resin “Jettable SVR (jSVR)

■ Product Name
  • Optical elastic resin “Jettable SVR (jSVR)”
■ Features
  • Correspond to inkjet coating.
    “jSVR” correspond to inkjet coating, ensuring higher workability while retaining the equivalent superior optical characteristics as those of the existing optical elastic resin. It can be readily used for coating displays in special shapes, which have notches and punch holes.
jSVR Hybrid SVR SVR
Coating
method
Inkjet coating
Inkjet coating
Slit coating
Slit coating
Dispenser coating
Dispenser coating
Coating
laminating
method
  • Apply proper amount of resin to an intended position like printing, and conduct UV pre-curing.
  • After that, conduct vacuum lamination, and cure fully by UV.
  • Apply the resin all over evenly, and keep the resin form by UV pre-curing.
  • After that, conduct vacuum lamination, and cure fully by UV.
  • Calculate the amount of resin, and apply it on the top plate.
  • After that, spread the resin all over by reverse lamination of the top plate, and cure the resin with UV.
Coating
shape
  • As coating shape can be controlled on the software, not only a quadrilateral but also various shapes of coating are possible.
  • Due to the slit coating, coating shape is limited to a quadrilateral.
  • In order to prevent the resin from protruding from a display, it is necessary to construct coating shape patterns and control the dam resin on the periphery.
Workability
  • As the switching of the coating shape due to display change is conducted on the software, the maintenance can be kept to the minimum.
  • When coating shape is switched due to the display change, the maintenance of the hardware is necessary.
  • When coating shape is switched due to the display change, the maintenance of the hardware is necessary.
  • High-precision, continuous control of coating thickness, which permits use for 3D-shaped displays as well
    “jSVR” permits continuous control of coating thickness, such as partially changing the thickness during coating. This means it can be used for 3D-shaped displays, such as curved displays, for which use of optical clear adhesive tapes was difficult.
  • Sales promotion of product for automotive displays has been launched, permitting prototyping with equipment possessed by Dexerials.
    Dexerials has introduced large prototyping equipment, which can be used for large automotive displays, at its Headquarters and Tochigi Technology Center. This equipment permits customers to do test production by using samples before introducing their own equipment.
■ Specifications
Product name jSVR*2
Coater Inkjet
Pre-curing condition [mJ/cm2]*3 500 - 1,000
Fully-curing condition [mJ/cm2]*4 ≧1,000
Viscosity [mPa・s]*5 10 - 30
Hardness*6 E15 - E40
Refractive index*7 solid 1.45 - 1.49
Elastic Modulus[Pa]*8 25℃ 104 - 106
Storage temperature [℃] 10 - 30
  • *1The 2020 share for value amount of optical clear resin (OCR/LOCA) according to the “Reality and Future Prospect of Display Related Market 2021”issued Fuji Chimera Research Institute,inc. Optical elasticity resins (SVR) is the product name for Dexerials’ optical clear resin.
  • *2Specification numbers are not the specified model numbers but the range that can be handled. For the detailed specifications, please ask the person in charge of sales in our company.
  • *3LED 365nm
  • *4Metal-halide lamp
  • *5Rheo-meter @25°C
  • *6Durometer (Code E)
  • *7Abbe @25℃ D-line(589nm
  • *8DMS method:@1Hz