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Session 7 :
Driving Circuit for Advanced Displays
Display Electronics

Tuesday, May 23 / 11:10 AM   - 12:30 PM / Los Angeles Convention Center, 404

Chair:
Bong-Hyun You, Samsung Display Co., Yongin, South Korea

Co-Chair:
Juhn Yoo, LG Display, Paju-si, South Korea

7.1 - New a-IGZO TFT Pixel Circuit for High-Resolution Mobile AMOLED Display for Good Optical Uniformity at Low Gray Levels (11:10 AM - 11:30 AM)
  • Ji-Hwan Park, Kyeong-Soo Kang, Jiho Lee, Soo-Yeon Lee
    Seoul National University Seoul South Korea


  • This paper proposes a highly stable a-IGZO TFT pixel circuit for AMOLED displays, which can compensate for the non-uniform threshold voltage (VTH) of the TFT at a low gray level. The stable operation was achieved by minimizing the operation number of the switch connected to the VTH storage capacitor after the VTH compensation stage. The HSPICE simulation verified that the relative current error rate is within only 15.7% at 567 pA (13 gray level) against the VTH variations.
05/23/2023 11:10 AM 05/23/2023 11:30 AM America/Los_Angeles New a-IGZO TFT Pixel Circuit for High-Resolution Mobile AMOLED Display for Good Optical Uniformity at Low Gray Levels This paper proposes a highly stable a-IGZO TFT pixel circuit for AMOLED displays, which can compensate for the non-uniform threshold voltage (VTH) of the TFT at a low gray level. The stable operation was achieved by minimizing the operation number of the switch connected to the VTH storage capacitor after the VTH compensation stage. The HSPICE simulation verified that the relative current error rate is within only 15.7% at 567 pA (13 gray level) against the VTH variations. San Jose McEnery Convention Center 404 Ji-Hwan Park, Kyeong-Soo Kang, Jiho Lee, Soo-Yeon Lee
7.2 - A Low-Power Pixel Circuit Using Extra Current Source for MiniLED Displays (11:30 AM - 11:50 AM)
  • Yi-Chien Chen, Chih-I Liu, Chih-Lung Lin
    National Cheng Kung University Tainan Taiwan Roc

  • Ming-Yang Deng
    AU Optronics Corporation Hsinchu Taiwan Roc


  • A structure with an additional current path is adopted in the proposed circuit to reduce power consumption. Threshold voltage variations and VDD I-R drops are compensated effectively. The power consumption is reduced by 12.95% from the conventional pixel circuits.
05/23/2023 11:30 AM 05/23/2023 11:50 AM America/Los_Angeles A Low-Power Pixel Circuit Using Extra Current Source for MiniLED Displays A structure with an additional current path is adopted in the proposed circuit to reduce power consumption. Threshold voltage variations and VDD I-R drops are compensated effectively. The power consumption is reduced by 12.95% from the conventional pixel circuits. San Jose McEnery Convention Center 404 Ming-Yang Deng
7.3 - A New Line-by-Line SWEEP Signal-Generation Method for PWM Driving MicroLED TFT Pixel Circuit (11:50 AM - 12:10 PM)
  • Kyeong-Soo Kang, Ji-Hwan Park, Chanjin Park, Soo-Yeon Lee
    Seoul National University Seoul South Korea


  • This paper proposes a novel method to generate line-by-line SWEEP signals for PWM-driving microLED pixel circuits by utilizing the existing SCAN signals. Simulation results verify that a constant current integration on a horizontal bus line successfully generates SWEEP signal voltage without significantly increasing operational complexity.
05/23/2023 11:50 AM 05/23/2023 12:10 PM America/Los_Angeles A New Line-by-Line SWEEP Signal-Generation Method for PWM Driving MicroLED TFT Pixel Circuit This paper proposes a novel method to generate line-by-line SWEEP signals for PWM-driving microLED pixel circuits by utilizing the existing SCAN signals. Simulation results verify that a constant current integration on a horizontal bus line successfully generates SWEEP signal voltage without significantly increasing operational complexity. San Jose McEnery Convention Center 404 Kyeong-Soo Kang, Ji-Hwan Park, Chanjin Park, Soo-Yeon Lee
7.4 - Novel a-IGZO TFT MicroLED Circuit with Improved Stability and Area Efficiency (12:10 PM - 12:30 PM)
  • Chanjin Park, Kyeong-Soo Kang, Ji-Hwan Park, Soo-Yeon Lee
    Seoul National University Seoul South Korea


  • A novel a-IGZO TFT pixel circuit for a PWM driving microLED display is proposed. A compact structure can be achieved by eliminating the data line for the constant current generation (CCG) unit. Furthermore, the proposed circuit effectively reduces the current error rate of the CCG unit, especially at low gray levels.
05/23/2023 12:10 PM 05/23/2023 12:30 PM America/Los_Angeles Novel a-IGZO TFT MicroLED Circuit with Improved Stability and Area Efficiency A novel a-IGZO TFT pixel circuit for a PWM driving microLED display is proposed. A compact structure can be achieved by eliminating the data line for the constant current generation (CCG) unit. Furthermore, the proposed circuit effectively reduces the current error rate of the CCG unit, especially at low gray levels. San Jose McEnery Convention Center 404 Chanjin Park, Kyeong-Soo Kang, Ji-Hwan Park, Soo-Yeon Lee