2024.01.11 17:13

IEEE-NEMS 2023, Jeju, Korea

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IEEE-NEMS 2023, Jeju, Korea

May 14 - May 17, 2023 (Sun. - Wed.), Ramada Plaza Hotel


Patch-Type Electromagnetic Energy Focusing Metasurface for Wireless Power Transfer in Bio-Implantable Devices

Wonwoo Lee, Semin Jo, and Hojin Lee


Abstract

 Herein, a patch-type metasurface is proposed that improves the power transferred to the skin by reducing the reflection loss of electromagnetic waves at the air–skin interface and forming a focal point at a specific location. The subwavelength-thickness (< λ/10) metasurface is introduced that focuses electromagnetic energy to a desired depth in multilayered biological tissues to enhance the transferred power for implantable devices. The stable focusing performance is demonstrated by confirming the robust focal point and field intensity profiles for oblique incident angles and polarization directions with enhanced voltage of approximately 11.1 dBmV at a depth of 10 mm in an in-vitro environment. By applying the patch-type metasurface to an actual implemented wireless power transfer system, an improved transmission coefficient of 6.37 dB is realized at a depth of 10 mm compared with that of a system without the metasurface patch.

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2023.10.05 19:11

IMID 2023, Pusan, Korea

조회 수 953 추천 수 0 댓글 0
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IMID 2023, Pusan, Korea

August 22 - August 25, 2023 (Tue. - Fri.), Bexco


KakaoTalk_20230915_133954200.jpg

a-InGaZnO TFT Scan Driver for Extra Period Function with Compensating Depletion-mode 

Jinho Moon, Yongchan Kim, Hyunwoo Kim, and Hojin Lee


Abstract

 Recently, with the development of future technologies that enable high-resolution displays, interest in higher frame rates and larger display areas has increased. However, these displays face issues with limited pixel areas, and external pixel compensation circuits are necessary. Nevertheless, external pixel compensation cannot be properly performed due to a lack of sensing time. To overcome this problem, we propose a scan driver based on a-InGaZnO transistors, which are responsible for controlling the switching TFTs in the pixel circuit. To further improve compensation, we combined a memory function block at the input of the scan driver, which provides extra sensing periods for pixel circuits, thereby improving compensation accuracy. Additionally, we utilized the capacitive coupling effect to enhance the performance of the scan driver and also to improve the depletion-mode operation, which can be caused by oxide TFTs. The proposed scan driver allows for improved signal transfer between the pixel circuit and the scan driver, resulting in better compensation accuracy.



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2023.10.05 17:49

IMID 2023, Pusan, Korea

조회 수 231 추천 수 0 댓글 0
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IMID 2023, Pusan, Korea

August 22 - August 25, 2023 (Tue. - Fri.), Bexco


KakaoTalk_20230915_143706594_04.jpg

Patch-Type Metasurface Based Wireless Power Transfer System for Bioimplantable Devices

Wonwoo Lee , Semin Jo , and Hojin Lee 


Abstract

 In this work, a patch-type WPT system using EM wave focusing metasurface is presested. A subwavelength-thickness (< λ/10) metasurface that focuses electromagnetic waves to a desired depth in multilayered biological tissues to enhance the transferred power of WPT system for implantable devices. We demonstrated the stable focusing performance of the proposed metasurface patch by confirming the fixed focal point and field intensity profiles for oblique incident angles up to 30°.

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2023.10.05 17:40

IMID 2023, Pusan, Korea

조회 수 766 추천 수 0 댓글 0
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IMID 2023, Pusan, Korea

August 22 - August 25, 2023 (Tue. - Fri.), Bexco


KakaoTalk_20230915_133843389.jpg

Novel AM-OLED Pixel Circuit Compensating for Threshold Voltage Variations and Depletion Mode of a-IGZO TFT 

Hyunwoo Kim , Yongchan Kim , Jinho Moon , and Hojin Lee


Abstract


 This paper proposes a novel voltage-programmed pixel circuit based on a-IGZO TFT for AM-OLED that compensates for VTH shifts of driving TFT. The proposed pixel circuit is expected to achieve stable and wide OLED current even if the threshold voltage of the driving TFT is shifted.

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2023.10.05 17:34

IMID 2023, Pusan, Korea

조회 수 652 추천 수 0 댓글 0
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IMID 2023, Pusan, Korea

August 22 - August 25, 2023 (Tue. - Fri.), Bexco


KakaoTalk_20230915_133716109.jpg


Ultra-High Resolution Organic Light-Emitting Diodes Combined with Plasmonic Nanomesh Electrodes

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 hyper-realistic microdisplay such as virtual reality (VR)/ augmented reality (AR) displays. Particularly, research have done combined plasmonic nanotechnology and organic light-emitting devices are being actively studied to improve optical and electrical properties. In this work, we propose a high resolution OLEDs based on a double resonance structure combined with an asymmetric Fabry-Perot (FP) etalon structure and a plasmonic nanomesh electrodes (PNE) using a photo- patternable organic light-emitting semiconductor without deterioration of intrinsic physical/photoelectric properties of OLEDs.

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