A 55dB SNR with 240Hz Frame Scan Rate Mutual Capacitor 30×24 Touch-Screen Panel Read-Out IC Using Code-Division Multiple Sensing Technique

📋 论文概要

该论文提出了一种基于码分多址（CDMA）的互电容30×24触摸屏读出IC，实现了55dB的信噪比和240Hz的帧扫描率。通过CDMA技术，有效抑制了来自电源线（50/60Hz哼声）、显示噪声和SMPS等外部干扰，解决了触摸屏系统中噪声引起的性能下降问题。

💡 主要创新点

• 采用码分多址（CDMA）技术替代传统的时分或频分驱动方式，使多个通道同时激励，在不降低帧率的情况下提高信噪比和抗噪声能力。
• 实现了55dB SNR和240Hz帧扫描率的组合，相比传统方案在速度和精度上取得显著提升，支持流畅的多点触控和手势识别。

🏷 关键词

📄 原文摘要

interfaces, such as multi-touch, pinch zoom-in/out gestures, thus expanding the smartphone market. However, capacitive touch-screen technology still suffers from performance degradation like a low frame scan rate and poor accuracy, etc. One of the key performance factors is the immunity to external noise, which intrudes randomly into the touch-screen system. HUM, display noise, and SMPS are such noise sources. The main electrical power source produces HUM, one of the most important sources of noise, which has a 50 or 60Hz component. Display noise is emitted when an LCD or OLED is driven by the internal timing controller, which generates the driving signal in the tens of kHz range. The touch performance of On-Cell or In-Cell touch displays is seriously affected by this kind of noise,

👥 作者与机构

Hyungcheol Shin1, Seunghoon Ko1, Hongjae Jang1, Ilhyun Yun2, Kwyro Lee1

KAIST, Daejeon, Korea, Zinitix, Daejeon, Korea 1 2 Capacitive touch-screen technology introduces new concepts to user