[FPDI] '40-inch OLED Panel Is Largest Size Possible,' Samsung Says

Oct 30, 2008
Takuya Otani, Nikkei Electronics
Samsung SDI's 40-inch OLED panel
Samsung SDI's 40-inch OLED panel
[Click to enlarge image]
It is 8.9mm thick.
It is 8.9mm thick.
[Click to enlarge image]

Samsung SDI Co Ltd exhibited a 40-inch OLED panel that features a full HD resolution of 1920 x 1080, a contrast ratio of 1,000,000:1, a color gamut of 107% NTSC and a luminance of 200cd/m2 (peak luminance of 600cd/m2) at FPD International 2008.

Though there were some vertical line defects, the panel appeared to have a luminance peculiar to OLED displays.

The driver board is a low-temperature poly-Si TFT, and it is made by the super grain silicon (SGS) technology to grow crystals without using a laser.

"Our low temperature poly-Si TFT mass-production line cannot make panels larger than 31 inches," a Samsung staffer said. "This 40-inch TFT panel is the largest size that can be made on our pilot line, and it cannot be mass-produced right away."

The RGB organic light emitting materials were formed by vapor deposition. The company used a fine metal mask (FMM). Fluorescent materials are used for red and green, while a phosphorescent material is used for blue, the staffer said.

"In order to reduce variations in luminance, the panel incorporates a circuit that equalizes the current in the screen," the staffer said.

It is a bottom emission type display with a microcavity structure employed to improve the color gamut.