Touch panel for an acoustic touch position sensor using shear wave propagation

Knowles, Terence J.

doi:10.1121/1.413592

Cited by 3 publications

(3 citation statements)

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“…Touch screen has been widely used in mobile phones, PAD and computers. Touch screen can be divided into resistive, capacitive, infrared and surface-acoustic wave based on the induction principle [1]. Capacitive touch screen has the advantage of wear-resistant, long life, low power consumption, high sensitivity, noise rejection capability and support for multi-touch .When a finger or other conductor is near the projected capacitive touch screen, electric field at the touching point will be affected, resulting in increasing in the self-capacitance and reducing in the mutual capacitance at touch point.…”

Section: Introductionmentioning

confidence: 99%

Research Technologies of Projected Capacitive Touch Screen

Liu¹,

Feng²,

Chen³

et al. 2016

Proceedings of the 2015 5th International Conference on Computer Sciences and Automation Engineering

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Projected capacitive touch screen has the advantage of wear-resistant, high transmittance, long life, low power consumption, high sensitivity, noise rejection capability and support for multi-touch .This paper studies the related technologies of projected capacitive touch screen system: full touch point detection technology of mutual capacitance, gravity method to locate the touch point of the finger, IIR digital filter to improve the signal to noise ratio, bilinear interpolation method to achieve the rotation and scaling of the image.

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Section: Introductionmentioning

confidence: 99%

Research Technologies of Projected Capacitive Touch Screen

Liu¹,

Feng²,

Chen³

et al. 2016

Proceedings of the 2015 5th International Conference on Computer Sciences and Automation Engineering

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“…Many kinds of touch sensing methods, including the acoustic-wave [1], infrared [2], resistive [3], and capacitive methods [4]- [6], have been proposed and commercialized. Among them, the resistive and capacitive sensing methods are mainly utilized in consumer electronic products.…”

Section: Introductionmentioning

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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“…At present, TPs have several package structures: out-cell, on-cell and in-cell. There are ve sensing techniques such as resistive [1], capacitive [2,3], optical [4], surface wave [5] and electromagnetic methods. In industries, the projected capacitive sensing is the dominant technique for commercial products.…”

Section: Introductionmentioning

confidence: 99%

Analytical Calculation for Capacitances of Electrode Patterns in Touch Panels

Liang¹,

Liu²,

Yeh³

et al. 2017

Optical Data Processing and Storage

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Abstract:In this paper, an accurate 3-dimensional (3-D) analytical solution is proposed to calculate the projective capacitances of touch panels. In this study, both simple and complex patterns were investigated for the calculation. We propose a partition strategy to divide a pattern into many rectangular or triangular sub-patterns. Each sub-pattern can be further cut into 2-D slices. The capacitance of a 2-D slice was then solved by our closed-form formulae. The total capacitance of a pattern was obtained by integrating up all the partial capacitances of the slices. In this study, the precision of our analytical method was examined by comparing the simulation results obtained from Q3DTM . The results of our method had a limited deviation from the simulation results while made the computation time from one hour or some by the commercial software down to just a few tens of sec by Matlab TM . In this study, the error is about 5% for simple patterns while the error was within 20% for a very complex pattern.

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Touch panel for an acoustic touch position sensor using shear wave propagation

Cited by 3 publications

References 0 publications

Research Technologies of Projected Capacitive Touch Screen

Research Technologies of Projected Capacitive Touch Screen

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

Analytical Calculation for Capacitances of Electrode Patterns in Touch Panels

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