MANHASSET, N.Y. DuPont claims to have achieved record performance for printed organic LED displays, opening the door to OLED televisions.
DuPont said it applied advances in materials science to a scalable process for cost-effective OLED manufacture. The process can deliver displays with sufficient performance and lifetime to build OLED televisions that would last more than 15 years if operated eight hours per day, according to the company. (The estimate assumes
typical 30 percent duty cycle, running video.)
"The currently high cost of manufacturing with evaporated materials has limited market adoption and has constrained OLED manufacturing for larger-size displays," David B. Miller, president of DuPont Electronics & Communications, said in a statement. "With DuPont printed OLED materials and process technology, fabrication costs can be significantly reduced, and manufacturing can be scaled to accommodate TV-size displays."
Printed devices using the DuPont process have reliably achieved lifetimes to 50 percent of initial luminance of 29,000 hours for red, 110,000 hours for green and 34,000 hours for blue at typical television brightness levels.
DuPont said the results were obtained under the following constraints:
T50 adjusted display lifetime (based on accelerated lifetime testing), at 100 percent duty cycle and at the individual subpixel luminances required for 200 nits front-of-screen brightness, 40 percent aperture ratio, 46 percent transmission circular polarizer, white color (0.31, 0.33);
operation at 20°C; and
demonstrated current efficiencies of 15 cd/A with color coordinates of (0.65, 0.35) for the red device, 22 cd/A with color coordinates of (0.26, 0.64) for green devices, and 6 cd/A with color coordinates of (0.14, 0.14) for blue devices.