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유진태(Daniel J.T Yuh)배병성(Byung-Seong Bae) 호서대학교 공업기술연구소 2007 공업기술연구 논문집 Vol.26 No.1
For the highest display quality in the large thin film transistor liquid crystal displays (TFT LCDs), we should improve the flicker characteristics. One of the problems accompanying the large TFT LCDs is that there is Gate/Data signal delay caused by increase of the resistance and the parasitic capacitance of each long signal line. In this paper, level shift of pixel voltage mainly causing flicker in the large TFT LCDs was investigated. A gate and data delay effect on level shift of pixel voltage, and an aspect of variations of level shift of pixel voltage according to the gate and data signal schematic was evaluated.
인듐틴옥사이드와 몰리브데늄을 이용한 외부 기준 저항이 필요 없는 온도센서
전호식 ( Jeon Ho Sik ),배병성 ( Bae Byung Seong ) 한국센서학회 2010 센서학회지 Vol.19 No.6
Display quality depends on panel temperatures. To compensate it, temperatures sensor was integrated on the panel. The conventional temperature sensor integrated on the panel needs external reference resistor. Since the resistance of external resistor can vary according to the variation of the environment temperature. the conventional temperature sensor can make error in temperature sensing. The environmental temperatures can change by the hack light unit, driving circuits or chips. In this paper, we proposed a integrated temperature sensor on display panel which does not need external reference resister. Instead of external reference resistor, we used two materials which have different temperature coefficient in resistivity. They are connected serially and the output voltage was measured at the point of connection with the applied voltage to both ends. The proposed sensor was fabricated with indium tin oxide(ITO), and Mo metal electrode temperature sensor which were connected serially. We verified the temperature senor by the measurements of sensitivity, lineality. hysteresis, repeatability, stability, and accuracy.
김승겸(Soeung-Kyum Kim),배병성(Byung-Seong Bae) 호서대학교 공업기술연구소 2006 공업기술연구 논문집 Vol.25 No.1
Since Organic Thin Film Transistors(OTFT s) provide simple and low cost processes, it’s application to display has been studied. We developed an RC oscillator using organic thin film transistor and inverters with bootstrapped transistors. Design parameters were optimized by simulations and OTFTs were fabricated for the extraction of the parameters. The oscillator frequency and its dependence on resistance and bias voltage were studied. The frequency of the oscillator were simulated and is acceptable for low-cost microelectronic device and flat panel displays.
a-IGZO TFT 기반 OLED 디스플레이 화소에 내장되는 OLED 열화 보상용 온도 센서의 개발
문승재 ( Seung Jae Moon ),김승균 ( Seong Gyun Kim ),최세용 ( Se Yong Choi ),이장후 ( Jang Hoo Lee ),이종모 ( Jong Mo Lee ),배병성 ( Byung Seong Bae ) 한국센서학회 2024 센서학회지 Vol.33 No.1
The quality of the display can be managed by effectively managing the temperature generated by the panel during use. Conventional display panels rely on an external reference resistor for temperature monitoring. However, this approach is easily affected by external factors such as temperature variations from the driving circuit and chips. These variations reduce reliability, causing complicated mounting owing to the external chip, and cannot monitor the individual pixel temperatures. However, this issue can be simply and efficiently addressed by integrating temperature sensors during the display panel manufacturing process. In this study, we fabricated and analyzed a temperature sensor integrated into an a-IGZO (amorphous indium-gallium-zinc-oxide) TFT array that was to precisely monitor temperature and prevent the deterioration of OLED display pixels. The temperature sensor was positioned on top of the oxide TFT. Simultaneously, it worked as a light shield layer, contributing to the reliability of the oxide. The characteristics of the array with integrated temperature sensors were measured and analyzed while adjusting the temperature in real-time. By integrating a temperature sensor into the TFT array, monitoring the temperature of the display became easier and more accurate. This study could contribute to managing the lifetime of the display.