In this paper, we present novel OLED display technologies for large-size UHD OLED TVs, including an IGZO TFT backplane, an RGBW pixel structure with white OLED, driving schemes and compensation methods applied to the panel. We also discuss technical issues and challenges in panel design and driving methods to compensate non-uniformities of oxide TFTs, OLED devices, color, and luminance. Using these technologies, we have successfully launched 55-, 65-and 77- inch UHD OLED TVs. Currently we focus on technologies to achieve higher image qualities, a wider color range and a higher cost competitiveness in the TV market.

The world's first 77-inch UHD OLED TV with an excellent image quality has been developed, using an IGZO TFT backplane and white OLEDs with an RGBW pixel structure and a novel compensation method applied to the panel. In this paper, we discuss technical issues and challenges in panel design and driving methods to compensate the non-uniformity of oxide TFTs, OLED devices, colors, and luminance, including our recent technologies that have realized a panel size scalability and a product reliability for commercializing large-size OLED TVs.

In this paper, we present OLED display technologies for largesize and premium TVs. Since high-quality TV needs total accuracy to reproduce input images, OLED panels must achieve stable luminance, uniformity at low luminance, and color uniformity. Using various OLED and TFT compensation technologies, we have successfully developed an OLED display with the "Real Black" image quality and high color uniformity.Additionally we have been developing OLED displays for broadcast monitors, which require much higher image quality than commercial TVs. We are now focusing on cost competitiveness of premium OLED displays.

In this paper, we present advanced OLED display technologies for large-size semi-flexible TVs, including a coplanar TFT backplane, a high-performance RGBW structure, compensation technologies and a high dynamic range technology for enhancing image qualities. By using them we have developed various displays and TVs such as curved, transparent, dual plate, and semi-flexible display applications. Currently we concentrate on technologies for premium displays and cost competitiveness for UHD OLED TVs.

Purpose: In 2015, the South Korean government legislated the Act for the Improvement of Training Conditions and Status of Medical Resid7`nn78bbbbbbbbbbnbents (Medical Resident Act). This study investigated changes in the working and learning environment pre- and post-implementation of the Medical Resident Act in 2017, as well as changes in training conditions by year post-implementation.Methods: An annual cross-sectional voluntary survey was conducted by the Korean Intern Resident Association (KIRA) between 2016 and 2019. The learning and working environment, including extended shift length, rest time, learning goals, and job satisfaction, were compared by institution type, training year, and specialty.Results: Of the 55,727 enrollees in the KIRA, 15,029 trainees took the survey, and the number of survey participants increased year by year (from 2,984 in 2016 to 4,700 in 2019). Overall working hours tended to decrease; however, interns worked the most (114 hours in 2016, 88 hours in 2019; P<0.001). Having 10 hours or more of break time has gradually become more common (P<0.001). Lunch breaks per week decreased from 5 in 2017 to 4 in 2019 (P<0.001). Trainees’ sense of educational deprivation increased from 17.5% in 2016 to 25.6% in 2018 (P<0.001). Awareness of tasks and program/work achievement goals increased from 29.2% in 2016 to 58.3% in 2018 (P<0.001). Satisfaction with the learning environment increased over time, whereas satisfaction with working conditions varied.Conclusion: The Medical Resident Act has brought promising changes to the training of medical residents in Korea, as well as their satisfaction with the training environment.