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SID Display Week 2023, Los Angeles, USA

May 22 - May 26, 2023 (Mon. - Fri.), Los Angeles Convention Center


KakaoTalk_20230530_142910510_05.jpg


An AMOLED Pixel Circuit Compensating for Variation of Sub-threshold Swing and Threshold Voltage Based on Double Gate a-IGZO TFTs 

Hyunwoo Kim, Yongchan Kim, and Hojin Lee

Abstract

   In this paper, an AMOLED pixel circuit based on amorphous indium-gallium-zinc-oxide (a-IGZO) thin-film transistors (TFTs) compensating for variations in sub-threshold swing (SS) and threshold voltage (VTH) of driving TFT is proposed. The proposed pixel circuit is composed of five TFTs and one capacitor. From the simulation results, when the SS and VTH shifts of the driving up to ±10% and ±1 V, the maximum OLED current error can be suppressed to 3.6% and 7.2%, respectively. 

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조회 수 1629 추천 수 0 댓글 0
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Metamaterials 2022, Siena, Italy

September 12 - September 17, 2022 (Mon. - Sat.), Siena Univ.


KakaoTalk_20221111_165127778.jpg


Trans-Reflective Dual-Mode Terahertz Spatial Light Modulator Using Electrically Tunable Metasurface

Wonwoo Lee, and Hojin Lee


Abstract

  

Terahertz imaging systems have been extensively studied due to its high-resolution and non-destructive characteristics implementing the considerable potential for security inspection, bio-chemical material identification, and real-time imaging technologies. Despite remarkable progresses, conventional terahertz imaging systems require high power source, expensive detector, and complicate and time-consuming systems. In this regard, single-pixel imaging technique has been implemented into the terahertz range to realize compressive and real-time imaging. However, previous researches only allow the transmissive or reflective imaging technique owing to the passive or absorption type spatial light modulators (SLM). In this work, transmissionreflection dual-mode terahertz spatial light modulator is presented using electrically tunable metasurface based on ion-gel gating graphene metasurface. By applying differential driving voltage on the proposed SLM, differential respective object images could be successfully obtained simultaneously both for transmission and reflection mode exhibiting high correspondence with real objects.

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2022.11.11 20:39

IMID 2022, Pusan, Korea

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IMID 2022, Pusan, Korea

August 23 - August 26, 2022 (Tue. - Fri.), Bexco


KakaoTalk_20221111_165547216_12.jpg


Monolithic Circuit Integrated with VOC Sensor Based on a-IGZO TFT

Eseudeo Yun, Yongchan Kim, Hanbin Choi, Do Hwan Kim, and Hojin Lee


Abstract

  

As volatile organic compound (VOCs) gases generated in industrial production lines is harmful to the human body, study on detecting VOCs gases has attracted much interest. For detection of various VOCs, Amorphous oxide semiconductors (AOS) have been highly researched to produce high-sensitivity chemoresistive-type VOCs gas sensors. Especially, amorphous indium gallium zinc oxide (a-IGZO) thin film transistors (TFTs) are considered the most promising candidate for gas sensors, thanks to their high field-effect mobility, low leakage current, good uniformity, and superior electrical stability with the low-temperature process. However, a-IGZObased gas sensors reported so far still remain in an early stage such as for resistor-type sensor or a single TFT. In this talk, we proposed a monolithic sensor circuit with high sensitivity capable of amplifying the sensing signal of the solution-processed a-IGZO sensor TFT. 

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2022.11.11 20:37

IMID 2022, Pusan, Korea

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IMID 2022, Pusan, Korea

August 23 - August 26, 2022 (Tue. - Fri.), Bexco


KakaoTalk_20221111_165547216_08.jpg


Ultra-High Resolution Organic Light-Emitting Diodes Based on Plasmonic Patterned Nanograting Array

Ryungyu Lee, Keun-Yeong Choi, and Hojin Lee


Abstract

  

Organic light-emitting diodes (OLEDs) have led to the rapid growth of the next-generation display technology due to high luminance efficiency, vivid color, and high contrast ratio, thereby expanding their applications from conventional mobile or TV displays to virtual reality (VR)/ augmented reality (AR) displays. For more effective light extraction, implementing nanostructures onto metal electrode layer of OLEDs as a future display technology has been demonstrated by use of excitation and out-coupling of the surface plasmon-polariton modes (SPPs). In this work, we propose a high resolution OLEDs based on plasmonic patterned nanograting array (PNA) that induces a plasmonic effect on OLEDs through the nano-patterned organic emission layer by applying E-beam lithography on the fabrication process without deterioration of intrinsic physical/photoelectric properties of organic layers.

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2022.11.11 20:32

IMID 2022, Pusan, Korea

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IMID 2022, Pusan, Korea

August 23 - August 26, 2022 (Tue. - Fri.), Bexco


KakaoTalk_20221111_165547216_03.jpg


Novel AMOLED Pixel Circuit Compensating for Variations in Sub-threshold Swing and Threshold Voltage of a-IGZO Thin-Film Transistors

Hyunwoo Kim, Yongchan Kim, and Hojin Lee


Abstract

  

Amorphous indium gallium zinc oxide (a-IGZO) thin-film transistors (TFTs) have been employed for the backplane of AMOLED displays because of high carrier mobility, good uniformity, and low off currenet. However, it is inevitable to have variations in threshold voltage (VTH) and sub-threshold swing (S.S.) due to bias-stress during display operations as well as the fabrication deviations. The VTH shift can be attributed to charge trapping in gate dielectric and interface states of semiconductor materials while the S.S. variation can cause a problem of leakage current that increases power consumption. Therefore, a circuit-level compensation method for deviation is required. In this paper, we have proposed a novel a-IGZO TFT pixel circuit which can compensate for the VTH and S.S. variation of the drive TFT.

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