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A 20‐inch, largest OLED display in the world is demonstrated which is driven by “Super Amorphous Silicon” technology. It has been widely believed that the characteristics of amorphous silicon TFT is not sufficient to drive OLED display. This paper turns over the hypothesis to prove that amorphous silicon can be applied to the large active‐matrix driven displays. Novel approaches to enable amorphous silicon to drive bright and long life OLED display are shown to open a bright future to realize larger OLED televisions.

An amorphous silicon thin film transistor (TFT) and a TFT with a microcrystalline/amorphous channel layer are studied for organic light emitting diode (OLED) backplane usage. The amorphous silicon TFT V TH shift can be reduced with saturation region operation. There are two mechanisms that cause the V TH shift in a saturation region: One that appears with continuous current flow and the other that appears with the transient charge injection into a gate insulator. SiH 4 flow in hydrogen plasma with a pumping flow period shorter than the gas residence time produces a high-transconductance microcrystalline/ amorphous silicon TFT.

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OLED lighting is the promising technology that makes the future lighting more valuable one. For OLED lighting to penetrate into market, considerable challenges remain. From ecology perspective, it is critical to improve the luminous efficacy. White OLED device with the world highest record of 139 lm/W (CCT = 2857 K) at 1,000 cd/m 2 was successfully achieved by introducing proprietary blue phosphorescent emitter to raise the internal quantum efficiency and improved internal extraction structure to enhance the light out-coupling efficiency.

-To come out with a successful organic light-emitting diode (OLED) lighting business, it is very important to have clear differentiation of OLED from LEDs. Flexible OLED has merits, such as capability to be mounted on the curved wall, which is not easy for LEDs to achieve the feature. There are several approaches to make flexible OLEDs especially among those plastic barrier films that can bring high level of flexibility, which could not be achieved by any conventional lighting method. In this paper, barrier films with various water vapor transmission rate values, including 10 À 6 order, are applied, and the conditions to have almost no dark spot growth under 85°C and 85% high temperature/humidity test are shown. Flexible OLED panels are manufactured with the world's first roll-to-roll equipment using plastic barrier film.

By introducing new terminology, active-matrix OLED's advanced performance can be well characterized. "Luminous Flux" and Assured Dynamic Range" better represent the viewer's impression than previous terminology such as "front luminance" and/or "viewing angle." Compensation circuit, low-stress driving technique, CVD condition, TFT shape, and high-efficiency OLEDs are the keys to enabling low-cost a-Si AMOLED manufacturing in order to compete with other display technologies.

A highly efficient OLED lighting product using allphosphorescent technology, for the first time in the world, is presented. Using proprietary blue phosphorescent emitter, 45 lm/W white emission is achieved at 2800K color temperature. The produced panel has very low driving voltage and small color shift regarding the viewing angle. The successful commercialization of all-phosphorescent technology would bring great power saving feature for OLED to compete with other technologies.