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A new method for monitoring an OLED panel for lighting by sensing the wave-guided light
한준한,문재현,신진욱,주철웅,조두희,황주현,허진우,추혜용,이정익 한국정보디스플레이학회 2012 Journal of information display Vol.13 No.3
In this work, we report on a new monitoring method for an organic light-emitting diode (OLED) panel for lighting by optical sensing of the wave-guided light in the substrate. Using microlens array films, the wave-guided light was extracted into the edge or back side of the panel to be monitored by a photodiode. The luminance of the extracted light was measured as linearly proportional to the front light. Thus, by converting the extracted light into photo voltage, monitoring the luminance change occurring in the OLED is possible. Based on the results and concepts, we have proposed a photodiode-equipped driving circuit which can generate compensated driving current for uniform luminance of OLED panels.
Transparent OLED Lighting Panel Design Using Two-Dimensional OLED Circuit Modeling
한준한,문재현,조두희,신진욱,주철웅,황주현,허진우,추혜용,이정익 한국전자통신연구원 2013 ETRI Journal Vol.35 No.4
In this work, we develop a simulation method to predict a two-dimensional luminance distribution method using a circuitry simulation. Based on the simulation results, we successfully fabricate large area (90 mm × 90 mm) transparent organic light-emitting diode panels with high luminance uniformity.
Luminescence enhancement of OLED lighting panels using a microlens array film
한준한,문제현,조두희,신진욱,추혜용,이정익,조남성,이종희 한국정보디스플레이학회 2018 Journal of information display Vol.19 No.4
The enhancement of the luminance of organic light-emitting diode (OLED) panels with various areas (2.25–6084mm2) using a microlens array (MLA) film was investigated. The luminance enhancement was dependent on the viewing angle, and the largest enhancement (64%) was observed in the normal direction while 60 and 18% enhancements were observed at 60 and 30°, which led to lower enhancement (38%) of the total luminous flux compared with the luminance enhancement (64%) in the normal direction. The luminance enhancement with the MLA film also depended on the panel area, and the smaller panels showed lower luminance enhancement than the larger ones. As for the small panels, the straying light beyond the panel areas significantly affected the luminance of the panels, and over 60% luminance enhancement was observed in the normal direction for the large panels (2500 and 6084mm2) with the MLA film while only 48 and 58% luminance enhancements were observed at the small panels (2.25 and 70mm2).