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Poster Session :
Display Electronics Posters

Thursday, May 16, 2024, 5:00 PM – 8:00 PM / San Jose Convention Center, Room 220A

P.68 - Oxide Semiconductor Thin-Film Transistor-Based MicroLED Pixel Circuit with External Current Setting System
  • Hye-Won Woo, Hwarim Im, Kook Chul Moon, Yong-Sang Kim
    Sungkyunkwan University Suwon South Korea


  • The authors propose an oxide semiconductor thin-film transistor-based micro light-emitting diode pixel circuit with external current setting system. The proposed circuit achieves stable operation using pulse-width modulation with maximum error rates 1.2% and 3.2% under threshold voltage variations and mobility variations, respectively.
P.69 - Cause Analysis of Water Ripple Issue on Charging-Ratio-Sensitive LCD Panels Based on TCON Timing Control Theory
  • Lijun Xiao, Junmin Zhang, Peng Jiang, Yanwei Lv
    BOE Wuhan China


  • Water ripple is the fine rolling textures phenomenon that occurs on large, high-resolution, and high-refresh-rate LCDs. It is a tough issue in the field of high-end TV. The root cause is that such panels are too sensitive to pixel charging ratio. To ameliorate the problem, this paper analyzes the causes of charging-ratio fluctuation from the perspectives of cross clock-domain conversions, display transport protocols, and SSC influence, based on the TCON timing control theory. A method is proposed to cover the issue. The results show that at least one or two levels of improvement can be achieved.
P.70 - A Novel Peak Luminance Correction Method Based on Global IR Drop Compensation System for AMOLED
  • Chunhui Ren, Xiaoping Tan, Mingwei Ge, Xiujian Zhu
    Kunshan Govisionox Optoelectronics Co., Ltd. Jiangsu China

  • Shunzhang Yu, Xingling Guo
    Hefei Visionox Technology Co., Ltd. Hefei China


  • Local excitation luminance is one of the important parameters to measure AMOLED quality. This feature is of great significance for the realization of HDR video and better visual experience in sunlight environments. Due to the IR drop effect in the local display, the performance of peak luminance is often skewed by luminance, chrominance, and gamma curves. The solution is adding gamma curve debugging at peak luminance of the local display, which results in longer take time (TT) and greater aging pressure at high luminance. In this paper, the authors propose a novel peak luminance correction method based on a global IR (GIR) voltage drop compensation system. In this system, GIR compensation look-up tables (LUTs) are used to accurately tune the luminance, chrominance, and gamma curves that correspond to the local excitation luminance.
P.71 - Analysis of Bright, Vertical, Chain-Like Spot Occurrence on Mobile OLED Screen Due to Electromagnetic Interference of Nearby GSM Device
  • Chelho Chung, Min Chul Shin, Jihoon Ha, Gilsung Roh, Heejung Kim, Haejo Kim, Sangkyung Kim, Jinseok Yang
    Magnachip Mixed-Signal, Ltd. Cheongju South Korea


  • Electromagnetic interference (EMI) plays a significant role in degraded image quality under specific operating conditions. The authors analyze an event that shows bright, vertical, chain-like spots on mobile organic light-emitting diode (OLED) displays due to the transmit operation of a global system for mobile (GSM) phone near the device under test (DUT). The cause of the event is laid out as follows. The transmitted radio frequency (RF) power travels through the flexible printed circuit (FPC) to the display driver integrated circuit (DDIC). Then the transistors respond to RF power as unintended RF diodes, which generate unexpected direct current (DC) voltage, which pushes the panel-driving buffer operational amplifier’s (OPAMP's) output to drift.
P.72 - A Bidirectional Gate Driver Circuit with Scan Signal for Low-Frame-Rate LTPO AMOLED Displays
  • Chia-Lun Lee, Ting-En Wei, Chih-Lung Lin
    National Cheng Kung University Tainan Taiwan Roc

  • Po-Cheng Lai
    AUO Corporation Hsinchu Taiwan Roc


  • This paper presents a bidirectional gate driver circuit based on low-temperature polycrystalline oxide thin-film transistors for a low-frame-rate AMOLED display. Simulation results indicate the falling and rising times of the output waveform are all below 3.48 µs and 0.56 µs with the threshold voltage variations of TFTs, ensuring the stability of the proposed circuit. The output waveforms are also generated successfully for a frame rate of 1Hz display panel and have no fluctuation in consecutive frames. Therefore, the proposed circuit is suitable for a low-frame-rate AMOLED display.
P.73 - Gate Driver Circuit to Generating Multi-Frequency Pulses Using LTPO Technology
  • Zhenghao Huang, Ji Xu, Zhenshen Pan, Yang Yang, Lu Zhang, Pengle Dang, Ying Shen
    Hefei Visionox Technology Co., Ltd. Hefei China

  • Xiujian Zhu
    Kunshan Govisionox Optoelectronics Co., Ltd. Kunshan China


  • This paper proposes a gate driver circuit for the implementation of multi-region and multi-refresh rates. The circuit uses a CMOS logic (a combination of n-IGZO and p-LTPS) to improve circuit operational reliability and low power consumption. The results of simulation show this gate driver circuit is applicable to multi-region and multi-refresh rates with control signals and clock signal power. Therefore, the proposed circuit is expected to contribute to the implementation of low power consumption in foldable products.
P.74 - Study on Mechanism of ?Vp Impact on Picture Quality and Optimization
  • Xinlan Yang, Zhou Peng, Zhan Wei, Shijun Wang
    BOE Display Technology Co. Ltd. Beijing China

  • Jiguo Wang, Yi Liu, Yule Tai, Shengmei Qi, Zhangjie Qiu, Gongda Chen, Yang Wang, Tengfei Ding, Haiyao Liang, Shengfeng Zhang, Tianjing Yu, Kaixuan Wang, Xi Chen
    BOE Display Technology Co. Ltd. China


  • Color shift or marginal fringe appears in the bilateral alternating drive mode of dual-gate structures, which is the impact of ΔVp between the near and far points of the gate in positive and negative frames on brightness uniformity. This paper discusses the mechanism analysis and the GOA design optimization.
P.75 - Extreme Low-Power a-InGaZnO TFT Scan Driver with Extra Clock-Signal Modulation
  • Hyunwoo Kim, Jinho Moon, Dongseok Kim, Hojin Lee
    Soongsil University Seoul South Korea


  • In this paper, a scan driver with extra clock signal using amorphous indium-gallium-zinc-oxide (a-InGaZnO) thin-film transistors (TFTs) is proposed. The extra clock signal with variable frequency modulates the pull-down unit of the scan driver in order to reduce the power consumption. The proposed scan driver is suitable for operating extreme low-power displays such as always-on displays.
P.76 - Influence of Bending FFC Transmission Line on High-Speed Signal Channels
  • Zaiyong Deng, Hongpeng Zhu, Yuqi Liu, Dongwen Chen, Lijia Song
    TCL China Star Optoelectronics Technology Co.Ltd. Shenzhen China


  • Generally, display devices interconnect FFC transmission lines with circuits to form a transmission line network system to achieve data communication between Tcon and driver. Due to the limitations of the external shape and internal space structure of the display device, the FFC transmission cable presents a curved shape from 0 to 180 degrees during the wiring process. Under the action of spatial electromagnetic fields, the display device will involve the field-circuit hybrid problem of electromagnetic coupling of the FFC transmission line’s bent line and circuit conduction interference, which will cause severe electromagnetic interference (EMI), resulting in deterioration of the high-speed channel signal at the receiving end and even inability to correctly restore and decode the signal, thus causing signal distortion, which in turn leads to display image distortion or pixel loss.
P.77 - A Novel Frequency-Doubling Technology with Adaptive Dither
  • Qian Wang
    TCL China Star Optoelectronics Technology Co.Ltd. Shenzhen China

  • Simin Zhai, Yaoming Guo, Weipeng Liao, Yuzhou Tang, Qiqi Lin, Xintian Su, Kai Wang, Jinfeng Liu, Yu Wu, Jianfeng Yuan, Zhifu Li, Bin Zhao
    TCL China Star Optoelectronics Technology Co.Ltd. China


  • In order to improve the refresh rate of large LCDs, a new optimized driving scheme combined with new GOA timing is implemented in a hardware platform, which is called adaptive scanning for frequency multiplication (ASF) technology, and can be applied to TV, MNT, NB, and other fields. First, this paper introduces the basic principle of dual-line gate technology (DLG), which is widely used, and analyzes its advantages and disadvantages. Then ASF technology is proposed to solve the disadvantages of DLG technology. The new optimized driving scheme mainly applies an inter-frame adaptive dither algorithm (ADA), an odd-and-even frame-interlaced compensation algorithm (OEC), and an application mode for intelligent detection of pictures. A prototype driving circuit is fabricated, and various detection tests are implemented. The results show the refresh rate is doubled without increasing hardware resources, and this technology avoids the loss of image quality.
P.78 - Application of Hot-Carrier-Degradation-Tolerant IGZO to High-Frequency LCD/e-Poster
  • Yohei Takeuchi, Atsushi Hachiya, Masafumi Sugino, Kengo Hara, Tatsuya Kawasaki, Hajime Imai
    Sharp Display Technology Corporation Kameyama Japan


  • The authors succeed in developing an IGZO process with extremely high tolerance to hot-carrier degradation. They verify the tolerance to hot-carrier degradation by device evaluation using extremely severe DC stress. And they actually fabricate displays and confirm that they can be displayed successfully. This high tolerance to hot-carrier deterioration not only makes it possible to meet the needs for higher resolution and higher speed driving of liquid-crystal displays, but also allows for higher speed rewriting of e-Paper.
P.79 - Calibration Data Methods for In-Cell Integrated Ambient Light and Color Temperature Sensor Data
  • Yi-Ting Chung, Yu-Hsiang Huang, Ding-Teng Shih, Chih Peng, Chun-Yi Chou
    Novatek Microelectronics Corporation Zhubei Taiwan Roc


  • In general, the algorithm for in-cell ambient light and color temperature sensors is optimized by the golden modules. However, there are differences between the modules. This implies that if we do not normalize the data from the modules, there will inevitably be a significant error. To this end, three calibration data methods for in-cell integrated ambient light and color temperature sensor data are proposed. With these methods, the illuminance error rate can be reduced to less than 6% and the color temperature absolute error can be reduced to less than 150.
P.80 - 4K Real 240Hz Technology in Large LCD-TFT TVs
  • Jun Wang, Chunyang Nie, Ke Dai, Yanping Liao
    Hefei BOE Display Technology Co., Ltd. Hefei China


  • This thesis introduces BOE’s self-developed 4K Real 240Hz technology in the field of large TFT-LCD TV.s In order to solve the problems of motion trailing, low charging rate, and high temperature of periphery line glass (PLG) caused by high refresh rate, the authors adopted the technologies of 2Frame overdriving (OD), muti-level CLK (MLC), and gate-pulse modulation (GPM). In addition, they used materials such as low GAP fast-response liquid crystals and the ION enhancement process to realize 4K Real 240Hz products with high image quality and fast response.
P.81 - Multimodal Intelligent Display Backplane Blocks
  • Florian De Roose, Mauricio Lopez, Hikmet Çeliker, Aris Siskos, Seyed Faramarzi, François Berghmans, Olivier Adjemian, Deepak Dahiya, Jan Genoe, Nikolas Papadopoulos
    imec Leuven Belgium

  • Wim Dehaene
    KU Leuven Leuven Belgium

  • Kris Myny
    KU Leuven Diepenbeek Belgium


  • The display of the future is multimodal, integrating optical sensors, RFID antennas, ultrasound transducers, etc. The sensors produce a large amount of redundant data, which should be preprocessed on the substrate, ideally on the back panel. Control gates and select and data drivers need to be more configurable and partitionable to create operational flexibility. This paper presents various circuit blocks for processing and control, including operational amplifiers, high-resolution analog-to-digital converters, a microprocessor, DC-DC converters, and high-resolution sensor pixel array architectures. Moreover, the performance of the basic building blocks is compared in LTPS and IGZO technology.
P.220 - A Novel Capacitive Touch Sensing Method with Folding-Angle Detection using Foldable OLED TDDI Panel
  • Yi-Ying Lin, Chih-Chang Lai, Ching-Chung Lin
    Novatek Microelectronics Corporation Zhubei Taiwan Roc


  • This article presents a novel approach for detecting the folding angle (?f) of foldable OLED TDDI panels using mutual capacitance driving. It offers the potential to reduce the number of module components, conserve space, and provide additional folding angle (?f) reference data for a wide range of applications. This method can be applied in self-capacitive and mutual-capacitive touch sensors, eliminating the need for additional sensors or design modifications.
P.247 Late-News Poster: Integrated Gate Driver Circuit with Self-Compensation Function Using Oxide TFTs for AMOLED Displays
  • Xuehuan Feng, Yongqian Li, Pan Xu, Ying Han, Donghui Zhao, Mingyi Zhu, Zhiqiang Dong, Tianji Li, Jianwei Yu, Xue Dong
    Hefei BOE Joint Technology Co., Ltd. Hefei China


  • The authors demonstrate a novel gate driver on array (GOA) circuit that has a self-compensation function, which not only reduces the number of TFTs but also improves the reliability characteristics of AMOLED panels. The proposed GOA circuit in a 5-in. experiment panel has passed 1,000 hours of high-temperature (60C) reliability tests.
P.248 Late-News Poster: Image Upscaling Techniques for IT Products; Evaluation and Analysis
  • Jinpil Kim, Kyungmin Choi, Wonbok Lee, Jongwoong Park
    Samsung Display Co., Ltd. Yongin South Korea


  • This paper introduces an upscaler technology that is proven to be effective in improving power reduction for IT products at the system level. The proposed upscaler algorithm utilizes Lanczos and bilinear interpolation, both of which are widely used in currently existing upscaler designs in the industry, and carefully analyzes the image distortion caused by 2x scaling of the input image and manipulates the possible artifacts by considering the key performance criteria in the upscaling. The experimental results show that image quality distortion due to the proposed scaling algorithm is significantly improved, while the small details in the images are preserved at most thanks to the combination of “blended upscale” and “edge enhancement” sub-functions in the proposed upscaling design. According to the authors' subjective evaluation, they obtained an average score of 4.39 over 15 persons with 21 images from well-known image benchmark suites.
P.249 Late-News Poster: A Low-Power Digital Logic Structure for High-Resolution and High-Frame-Rate OLEDoS Microdisplays
  • Seoyeong Jeong, Junhyuk Jang, Jaemyung Lim
    Hanyang University Seoul South Korea

  • Kichang Lee
    Samsung Display Co., Ltd. Yongin South Korea


  • This paper proposes a digital logic circuit in source driver for an OLEDoS microdisplay that uses a novel data signal tree structure with clock gating logic to lower the power consumption. The proposed structure for 4,096 × 4,096 (4K) 144Hz microdisplays is verified using a CMOS 110nm process. The power consumption is 69.6% reduced compared to the conventional data signal tree structure, thus enabling a low-power design.