TOKYO Seiko Epson Corp. has developed a 40-inch diagonal organic light-emitting diode (OLED) display prototype and announced that it will offer polymer-based OLED products beginning in 2007, perhaps including a 40-inch OLED TV.
The 40-inch panel was made by attaching four diagonal 20-inch low-temperature LCD panels and then printing polymer organic electronic luminescence materials using ink-jet printing technology.
"Our low temperature polysilicon line handles only the 400 x 500 mm substrate, so we used four panels pasted together to form a 40-inch display. But the purpose of the prototype is to show that our ink-jet printing technology can print and form OLED pixels in a large area," said Shoichi Iino, division manager of OLED Technological Development Division at Epson. "As large-sized substrates are already used in LCD lines, there won't be a big problem in using large- sized substrates when we make OLED products," he said.
The prototype display is a 40-inch diagonal with 1280 x 768 pixels delivering over 260,000 colors. Epson used ink-jet technology that can print and form OLED pixels in an area of 1200 x 820 mm with 2,880 dpi resolution.
"The biggest challenges for OLED display for TV applications are lifetime and enlarging the size," said Iino. Epson set the initial target for OLED panel performance at over 10,000 hours, the same level as the initial stage of plasma display panel TVs. "We believe it is possible through the improvement of process and structure of the display and development of new materials," Iion added.
Epson has completed it OLED product plan yet, but "we want to start our OLED business with a 40-inch TV set," said Iino.