Design of a Touch Controller for Multitouch Screen System With Touch Prediction and Window Sensing (TPWS) Strategy

Q Engineering

Journal of Display Technology Pub Date : 2016-09-22 DOI:10.1109/JDT.2016.2612698

Xiaomin Wei;Bo Li;Tingcun Wei;Jia Wang;Ran Zheng

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引用次数: 0

Abstract

The touch prediction and window sensing (TPWS) strategy is an effective approach to realize low-cost and low-power multitouch screen systems, especially for large-sized touch screen panels. The structures of traditional touch controller using charge integrating amplifier is not suitable for the TPWS touch screen systems. This paper presents a new touch controller, which is designed for the TPWS touch screen systems and is emphasized to improve the SNR and reporting rate of system. The differential measurement scheme with a full driving method is proposed to eliminate the influences on the SNR and the reporting rate of system caused by the LCD noise, the charger noise and the signal transmission delay on Indium-Tin Oxide (ITO) electrodes. The designed touch controller is realized in a 0.13 μm 1.8 V/5 V embedded flash CMOS process with the chip size of 2.5 × 2.8 mm ² . The test results demonstrate that this touch controller supports the TPWS strategy very well and its performances are improved significantly. Comparing with the previous design, the SNR is improved from 25 to 36 dB, and the reporting rate is increased from 83 to 120 Hz.

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基于触摸预测和窗口感知（TPWS）策略的多点触摸屏系统触摸控制器的设计

触摸预测和窗口感知（TPWS）策略是实现低成本、低功耗多触摸屏系统的有效方法，尤其是对于大型触摸屏面板。使用电荷积分放大器的传统触摸控制器的结构不适合于TPWS触摸屏系统。本文提出了一种新的触摸控制器，它是为TPWS触摸屏系统设计的，重点是提高系统的信噪比和报告率。为了消除LCD噪声、充电器噪声和铟锡氧化物（ITO）电极上的信号传输延迟对系统信噪比和报告率的影响，提出了全驱动差分测量方案。所设计的触摸控制器采用0.13μm 1.8V/5V嵌入式闪存CMOS工艺实现，芯片尺寸为2.5×2.8mm2。测试结果表明，该触摸控制器很好地支持了TPWS策略，性能得到了显著提高。与以前的设计相比，信噪比从25 dB提高到36 dB，报告率从83 Hz提高到120 Hz。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Display Technology 工程技术-工程：电子与电气

CiteScore

1.50

自引率

0.00%

发文量

审稿时长

2.8 months

期刊介绍： This publication covers the theory, material, design, fabrication, manufacturing and application of information displays and aspects of display technology that emphasize the progress in device engineering, design and simulation, materials, electronics, physics, and reliability aspects of displays and the application of displays. The Journal is sponsored by EDS, seven other IEEE societies (BT, CES, CPMT, IA, IM, PHO and SSC) and the Optical Society of America (OSA).