2D Coded-Aperture-Based Ultra-Compact Capacitive Touch-Screen Controller with 40 Reconfigurable Channels

📋 论文概要

本文提出了一种基于2D编码孔径的超紧凑电容式触摸屏控制器，通过40个可重构通道解决了大尺寸、薄型化、低成本触摸屏对更高性能控制器的需求。该控制器采用编码孔径技术优化信号检测，并利用偏移消除器抑制共模电流干扰。

💡 主要创新点

• 提出2D编码孔径技术，通过优化TX码不平衡和RX转向比，减小了所需电容CF，从而降低芯片面积和成本。
• 设计偏移消除器，利用虚拟TX通道和可编程增益电流放大器，有效抵消共模输入电流，提升信噪比。
• 实现40个可重构通道，支持不同尺寸和分辨率的触摸屏，增强了控制器的灵活性和适用性。

🏷 关键词

📄 原文摘要

For example, the 4×4 basis shown in Fig. 12.5.2 has a TX code unbalance of +2 and an RX steering ratio of 3:1, requiring CF larger than 6C0 even without room for noise margin. The offset canceller cancels out the common-mode input current using 0.5-to-4pF COS in series with a 1-to-4× programmable gain class-AB current amplifier, driven by a dummy TX channel coded with the opposite sign of the TX code unbalance, TXD. 1 As mutual-capacitive touch-screens expand their application area to various information devices, better controllers are in demand for larger, thinner, lowercost touch-screen panels (TSP), and in-cell/on-cell touch displays [1]. In order to gain higher sensitivity from such large and noisy TSPs, numerous parallel analog circuits are integrated on TSP controllers. Many solutions to cope with

👥 作者与机构

Hongjae Jang1, Hyungcheol Shin2, Seunghoon Ko1,

Ilhyun Yun2, Kwyro Lee1 KAIST, Daejeon, Korea, 2Zinitix, Daejeon, Korea of each TIA waste head-/leg-room and require large CF