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首页> 外文会议>IEEE International Solid-State Circuits Conference >A 55dB SNR with 240Hz frame scan rate mutual capacitor 30#x00D7;24 touch-screen panel read-out IC using code-division multiple sensing technique
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A 55dB SNR with 240Hz frame scan rate mutual capacitor 30#x00D7;24 touch-screen panel read-out IC using code-division multiple sensing technique

机译：采用码分多感测技术的55dB SNR和240Hz帧扫描速率互电容30×24触摸屏面板读出IC

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Capacitive touch-screen technology introduces new concepts to user 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, because the distance between the display pixel layer and the capacitive touchscreen panel is getting smaller. SMPS is another noise source that ranges up to 300kHz. The charger for a smart-phone, the USB port in a computer, a tri-phosphor fluorescent light bulb are all examples of sources of SMPS. There have been many attempts to remove such noise. Amplitude modulation with frequency hopping is proposed in [1]. However, when the noise environment changes, this method needs recalibration, resulting in non-constant touch response time. Another method tries to filter the noise from the display [2], but it does not remove other noise sources like HUM or SMPS.
机译：电容式触摸屏技术为用户界面引入了新概念，例如多点触摸，捏合放大/缩小手势，从而扩展了智能手机市场。但是，电容式触摸屏技术仍然会遭受诸如帧扫描速率低和精度差等性能下降的影响。关键性能因素之一是对外部噪声的抵抗力，该噪声会随机侵入触摸屏系统。嗡嗡声，显示噪声和SMPS就是这样的噪声源。主要电源产生HUM，HUM是最重要的噪声源之一，它具有50或60Hz的分量。当内部定时控制器驱动LCD或OLED时，会发出显示噪声，从而产生数十kHz范围的驱动信号。此类噪声严重影响了On-Cell或In-Cell触摸显示器的触摸性能，因为显示像素层与电容式触摸屏面板之间的距离越来越小。 SMPS是另一个噪声源，范围高达300kHz。 SMPS的来源都包括智能手机的充电器，计算机的USB端口，三基色荧光灯灯泡。已经进行了许多尝试来消除这种噪声。在文献[1]中提出了带有跳频的幅度调制。但是，当噪声环境变化时，此方法需要重新校准，从而导致非恒定的触摸响应时间。另一种方法试图从显示器中滤除噪声[2]，但它并没有消除其他噪声源，例如HUM或SMPS。

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