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AUO introduced bi-directional foldable AMOLED display which both internal and external displays can be bent 180 degrees.

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Taiwanese company, AU Optronics(AUO) introduced bi-directional foldable AMOLED display at IDW(International Display Workshoops) 2016 opened in Japan Fukuoka from last December 7th through 9th, which both internal and external displays can be bent 180 degrees.

<Changes in luminance ratio according to the folding time in inward and outward folding condition, IDW 2016>

The existing flexible AMOLED display is formed in the order of plastic board / OLED device / circular polarizer / touch film, and this structure had limits in flexibly bend both internally and externally because the upper and lower properties of main material become asymmetric. Regarding this, AUO located approximately 10um thickness of color filter array in the middle which replaces the circular polarizer, and located TFT and TFE layer in neutral axis, and by forming a structure to endure the tensile strength and compressive strength, they made it possible to endure folding cycle of more than 1.2 million in 4mm radius of curvature. The entire thickness is approximately 100um, and color filter array excluded the polarizer and used as a purpose of suppressing the reflection light.

Also, AUO introduced 5” foldable AMOLED panel function which applied the color filter array. When color filter array is applied, the power consumption decreased about 50% from 1603mW to 824mW compared to circular polarizer, and showed that the operating life was improved 3 times in 300 nits of same brightness.

<AUO’s 5” foldable AMOLED display function, IDW 2016>

BY HYUNJUN JANG, HANA OH

LG Display, announcement on development trend for OLED TV and latest WOLED device for lighting in IDW 2016

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In IDW(International Display Workshops) 2016 held in Fukuoka Japan from December 7~9, LG Display announced on the development trend for OLED TV and latest WOLED device for lighting, and mentioned that the color area of latest WOLED device for OLED TV increased from 114% to 129% compared to sRGB, and 90% to 99% compared to DCI. In the paper, 3 stack structured 55” UHD OLED TV shows 150cd/m2 in full white screen, 500cd/m2 of luminance in peak white screen, and showed that it lowered the power consumption by 20% compared with 2 stack structure.

<LG Display’s 2 stack and 3 stack WOLED lighting structure, IDW 2016>

Also by introducing WOLED for lighting, LG Display mentioned that lighting WOLED has 3 stack tandem structure with green-red/blue/green-red, where WOLED for OLED TV has 3 stack tandem structure with blue/yellow-green/blue. It showed high efficiency of 90lm/w by applying Ag cathode and light extraction film which the reflectivity is high, and the color temperature is 2,850K which is in the warm white range, CRI showed characteristics of 88. This OLED light will start its production in 3rd quarter of 2017 in 5 generation line.

<LG Display’s 2 stack and 3 stack WOLED light structure which applied light extraction film, IDW 2016>

Meanwhile, LG display exhibited 800 nit 65” UHD OLED TV during OLED summit 2016 held last September in San Diego where they gained much interest compared to 65” curved QD-LCD TV quality, and it is expected that they will introduce OLED TV with improved luminance with more than 1,000 nits next year.

<Comparison of black quality between 65inch OLED TV(left) and 65inch curved QD-LCD TV(right), LG Display, OLED Summit 2016>