We present a novel OLED display panel with high-reliability integrated gate driver circuit using IGZO TFTs. Our gate driver circuit can drive a large-sized OLED display not only for displaying images but also for sensing TFT characteristics for external compensation. It functions correctly even when the threshold voltage of TFTs is negative by reducing leakage currents. We have achieved a life time longer than 60,000 hours in a reliability test and successfully applied it to 55-inch UHD, 65-inch UHD and 55-inch FHD OLED displays, which improves cost-competitiveness of OLED displays against LCDs.

The functional requirements (FRs) and design equation of a flexible system change in a continuous manner with respect to a variable such as time. An event-driven flexible system is defined as a subcategory of the flexible system in that it changes in a discrete space. A design scenario is developed for the event-driven systems. The design equation for each event should be defined by using the axiomatic approach and the design equations are assembled to form a full design equation. The design equation for each event can be established by sensitivity analysis. In conceptual design, the design order is determined on the basis of the full design equation. Design parameters (DPs) are found to satisfy FRs in sequence. A DP may consist of multiple design variables. In a detailed design, the design variables are determined. The occupant protection system is an event-driven flexible system because the design matrix and its elements change according to the impact speed. The involved devices are designed on the basis of the developed method. FRs at different impact speeds and corresponding DPs are defined. In a detailed design, the full factorial design of experiments is employed for the design variables of the DPs to reduce the injury levels of the occupant. Computer simulation is utilized for evaluation of the injuries. The results are discussed.

The airbag is a widely accepted device for occupant protection in the automotive industry. Both restraint and automobile manufacturers have to come up with a proper airbag design to reduce the injuries from static and dynamic tests in the FMVSS 208 regulation. The objective of this study is to investigate the injury characteristics of the Hybrid III fifth percentile female dummy according to airbag inflation. In order to study the injury patterns, tests are performed for the dummy with the out-of-position (OOP). The test conditions are varied with various airbag parameters such as inflators, airbag folding methods, and cover tear lines. The relationships are investigated further by using computer simulations. The guidelines for the airbag design with the OOP are established and the injury patterns are identified.

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