Dow Electronic Materials and DuPont’s Display Technologies businesses recently showcased a variety of products and technologies at the IMID 2017 Korea Display Exhibition in Seoul. The event, the largest display exhibition in Korea, was held Oct. 17-19, and featured 350 booths from 150 companies. The joint booth highlighted materials from both the Dow and DuPont sides of the business, and covered a wide range of display formats, with zones for OLED, flexible, quantum dot and high-performance displays.
The exhibit featured diverse OLED materials that enable the production of both rigid and flexible high-performance OLED displays with an extended color range and more natural colors. Dow offerings included its latest generation of emitters and materials for other layers of RGB OLED displays. DuPont presented its materials for inkjet printing, designed to improve performance and cost-competitiveness for large OLED TV panels.
This zone featured a suite of transparent polyimide (PI) products from DuPont. These materials are used in a range of flexible display components, including cover windows, touch panels, LCD and OLED substrates. The soluble PI films have excellent optical, thermal and mechanical properties, and maintain high optical transmittance and low haze even after 1 million bending cycles, further advancing the commercialization of the foldable display.
DuPont also exhibited new products designed for automotive displays. These materials meet the demanding long-term reliability requirements of the automotive industry, while functioning in a high-temperature, high-humidity environment. They demonstrate UV stability and maintain excellent optical and physical properties, similar to those of acrylic materials.
Dow and DuPont jointly introduced transparent PI and hard-coating products designed to replace tempered glass screen covers. Such flexible, impact-resistant, scratch-resistant coatings will be needed to enable market growth of commercial flexible displays.
Cadmium-Free Quantum Dot Displays
Dow demonstrated its TREVISTA™ cadmium-free quantum dots, which feature a wide color gamut for lifelike color without the use of cadmium. This product, available as a film, is RoHS-compliant and, when combined with a blue LED, covers up to 98% of the DCI P3 color gamut. Dow’s Jake Joo presented the latest developments of cadmium-free QDs. His session discussed alternative integration options (on-chip, color filter and QD electroluminescent device) that can further reduce QD loading, and improve system efficiency and color purity.
This zone featured photosensitive materials for several applications. High-speed positive-type and high-resolution negative-type photosensitive organic passivation layers improve the yield of the thin film transistor arrays that drive the LCD in large TV screens. These passivation layers enable greater pixel size and better-controlled parasitic capacitance. LCD displays can benefit from high-resolution column spacers and low-temperature curable over-coating materials, which were among the materials on exhibit. The high-performance display zone also featured a pixel-defining-layer patterning material with excellent light stability for OLED displays. An interactive exhibit demonstrated control of white dots on a glass panel coated with a high-performance black column spacer, developed to enable manufacturers to make a more effective bezel-less, curved-edge display.
“While the TV display market is constantly introducing innovation based on qualitative growth rather than quantitative growth, the mobile display market is pursuing both quantitative and qualitative growth at the same time, and it is evolving very fast,” said Sang-Ho Kang, Display Technologies Global Business Director, Electronics & Imaging. “We were very excited to introduce our excellent display material solutions from Dow and DuPont in pace with market demands for new and innovative applications through this exhibition.”