Samsung Develops Ultrathin OEL Panel with 0.25-mm Thickness

Sept 3, 2007 18:27 Naoki Tanaka, Nikkei Microdevices

Samsung SDI Co. Ltd. of South Korea developed an ultrathin OEL panel with a thickness of 0.25 mm and presented it at the International Meeting on Information Display (IMID) in Taegu, Korea.

The product thickness of 0.25 mm is the value for the total profile of the panel and deflecting plate. This slimness was achieved by the use of a 50-mum thick glass substrate, which is thinner than photographic film.

The 4-inch ultrathin OEL prototype panel features a resolution of 480 x 272. The panel can be bent thanks to its slimness, and it was exhibited in a curved condition at Samsung's booth.

According to the company, the prototype panel can reproduce 16,700,000 colors, 100% of the NTSC color gamut, a luminance of 200 cd/m2, a contrast ratio of 1,000:1 and a service life of 20,000 hours. The company exhibited the 50-μm thick glass substrate beside the panel together with a photographic film to underscore the slimness of the substrate.

Samsung also developed and exhibited a 2.4-inch QVGA panel using this 50-μm substrate, although it was not turned on when Tech-On! examined it. The 2.4-inch QVGA panel reportedly has a thickness of 0.37 mm including the module block.

According to the company, the panel features a reproduction of 260,000 colors, 100% NTSC color gamut, luminance of 200 cd/m2, contrast ratio of 10,000:1 and service life of 25,000 hours.

Low-temperature poly-silicon liquid crystal is used for the TFT substrates of both 4- and 2.4-inch OELs. The organic EL device is made of low-molecular material, and the device has a top-emission structure.

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