Maximizing responsiveness of touch sensing via charge multiplexing in touchscreen devices

Park, Yong-Suk; Bae, Jin-Woong; Kim, Eung-Soo; Park, Taejoon

doi:10.1109/tce.2010.5606345

Cited by 16 publications

(12 citation statements)

References 5 publications

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“…2 shows the comparison results for the normalized signal power, integration of r j (t) in Eq. (1), acquired by the conventional W-H sequences [1][2][3] and 4k orders of H by Paley, Williamson and Baumert-Hall arrays [5]. As the scan rate increases, the accumulated signal power decreases accordingly.…”

Section: Analysis Resultsmentioning

confidence: 99%

“…Each driving channel should be activated at its own time slot. In recent years, more signal powers can be achieved by the use of simultaneous driving channels that are specified by the one of orthogonal codes, Walsh-Hadamard (W-H) sequences [1,2]. These have been used for the industrial-level implementation such as in-cell TX technology and have the same design concept as shown in the earlier study [3].…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we discuss the applicability of 4k-order Hadamard matrices for the capacitive touch system beyond the conventional W-H sequences of 2 k -order [1][2][3]. With the given design constraints and the specification for the touch system, we conducted comparative analysis among the orthogonal codes in terms of the number of possible simultaneous driving channels, controllability for the sensing time versus signal power and the required input ranges for the receiver stages.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Application of 4k-order Hadamard matrices to simultaneous driving capacitive touch systems

Park

Lee

Kim

et al. 2015

2015 IEEE International Conference on Consumer Electronics (ICCE)

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In recent years, simultaneous driving and sensing techniques for capacitive sensors have used to obtain high signalto-noise ratio for given time limit of the touch system. In this paper, we show more effective utilization of design constraints of touch system by the use of the variants of 4k-order orthogonal codes. It is also possible to ease the specification of input stages of receivers in capacitive touch controllers.

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Section: Analysis Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Application of 4k-order Hadamard matrices to simultaneous driving capacitive touch systems

Park

Lee

Kim

et al. 2015

2015 IEEE International Conference on Consumer Electronics (ICCE)

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“…2. Since a finger also possesses small capacitance, placing fingers on the screen makes the capacitance to be slightly increased at the points of touch [10], which means the increment of the self capacitance, C S . By measuring the differences in their C S and C M , the touch position can be detected.…”

Section: A Overview Of the Projected Capacitive Touch Panelmentioning

confidence: 99%

A Touch Sensor Controller IC Adopting Differential Measurement for Projected Capacitive Touch Panel Systems

Si-wei

Wei

et al. 2012

2012 IEEE 12th International Conference on Computer and Information Technology

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A touch sensor controller IC with a novel touch sensing scheme is proposed for projected capacitive touch panel. The proposed IC adopts the differential measurements to amplify the capacitance variation. By using the proposed scheme, the sensitivity to a touch object is increased and the immunities to power noise and display noise are improved. The signal-to-noise ratio (SNR) of the touch sensor controller IC is 20.1 dB. The proposed IC fabricated via 0.13 μm CMOS process occupies a silicon area of 1.9 mm × 2.2 mm and consumes a dynamic current of 470 uA when the analog and digital supply voltages are 3.3 V and 1.8 V, respectively.

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“…The work of [5], [6] focuses on the reduction of hardware complexity by a compressive sensing based approach. The work of [7] addresses the sensing speed and proposes an algorithm to detect the presence of touch. In [8], the authors propose a method to distinguish fingers on the touch panel for a specific application purpose.…”

Section: Introductionmentioning

confidence: 99%

Multi-touch points detection for capacitive touch panel

Chang

Chung

2013

2013 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference

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Abstract-We consider the detection of multiple touch points for capacitive touch panel systems under Gaussian noise. We propose an algorithm that reduces the noise-induced detection error and improves the detection accuracy with partial touch signal information. The proposed algorithm is based on the likelihood ratio test, and utilizes the touch signal features, such as the local maximum, the range of touch magnitude, and the consecutive occurrence of touch locations, to first detect touch points and then calculates the real touch coordinates based on the weighting average technique. Simulation demonstrates the improved performance of the proposed algorithm.

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Maximizing responsiveness of touch sensing via charge multiplexing in touchscreen devices

Cited by 16 publications

References 5 publications

Application of 4k-order Hadamard matrices to simultaneous driving capacitive touch systems

Application of 4k-order Hadamard matrices to simultaneous driving capacitive touch systems

A Touch Sensor Controller IC Adopting Differential Measurement for Projected Capacitive Touch Panel Systems

Multi-touch points detection for capacitive touch panel

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