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As mutual-capacitive touch-screens expand their application area to various information devices, better controllers are in demand for larger, thinner, lower-cost 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 harsh...
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...
A high SNR capacitive touch screen panel (TSP) readout IC is designed. In this paper, Orthogonal Frequency Division Multiple Sensing method is proposed to enhance frame scan rate. Capacitor-less Trans-Impedance Amplifier and Direct Digital Frequency Synthesizer based on Harmonic Rejection Ratio DAC is proposed to save chip area. The prototype IC with 0.18um CMOS achieves 70dB SNR for a finger and...
Capacitive touch screen sensor, though it enables multi-touch recognition, has problems rejecting distributed noise such as LCD, RF and EMI interferences coupled to transparent ITO electrodes. This paper presents a capacitive sensor design for multiple channels at the X-Y crossing of ITO patterns on the LCD panel. Capacitance-to-Voltage converter (C-VC) with moving average and time interleaved scheme...
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