Why Piezoelectric Material Is Unsuccessful in Interactive Displays: Challenges in High Detection Accuracy

Gao, Shuo; Wu, Linxiao

doi:10.1109/mce.2019.2892264

Cited by 15 publications

(9 citation statements)

References 8 publications

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“…As shown in Figure 9 , when a force is applied to the touch panel, the stress will propagate to the adjacent locations and therefore reduce the detection accuracy. The responsivity induced by the propagated stress cannot be neglected, as it can even be higher than that at the actual touch locations [ 9 ]. One method to solve this problem is to eliminate the propagated stress by using capacitive signals.…”

Section: Conventional Applications and Discussionmentioning

confidence: 99%

“…The insulating layers of the capacitive touch panels are changed to the piezoelectric ones to fabricate the piezoelectric touch panels. These designs are advantageous for the high sensitivity in detecting the force, but they have low accuracy when detecting the x-y position [ 9 , 44 ]. To solve this problem, another design is put forward.…”

Section: Piezoelectric-based Touch Sensing Architecturementioning

confidence: 99%

“…To obtain 3-dimensional information in a low-cost, piezoelectric touch panel is a suitable approach. In the piezoelectric-based touch panel, the piezoelectric material can be used as the insulating layer of the capacitive touch panel [ 8 , 9 ]. As a result, it can obtain force information in a much simpler architecture.…”

Section: Introductionmentioning

confidence: 99%

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Piezoelectric Based Touch Sensing for Interactive Displays—A Short Review

Liu

2021

Materials

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Interactive display is an important part of electronic devices. It is widely used in smartphones, laptops, and industrial equipment. To achieve 3-dimensional detection, the piezoelectric touch panel gains great popularity for its advantages of high sensitivity, low cost, and simple structure. In order to help readers understand the basic principles and the current technical status, this article introduces the work principles of the piezoelectric touch panel, widely-used piezoelectric materials and their characteristics, as well as the applications of the piezoelectric touch panel. The challenges and future trends are also discussed.

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Section: Conventional Applications and Discussionmentioning

confidence: 99%

Section: Piezoelectric-based Touch Sensing Architecturementioning

confidence: 99%

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Piezoelectric Based Touch Sensing for Interactive Displays—A Short Review

Liu

2021

Materials

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“…3, which depicts the time domain and frequency domain of a force touch induced electric signal on a piezoelectric sample. Hence, the frequency of force touch signal could be from DC to the kHz range [21], [22]. From the explanation in this section, we can conclude that since the capacitive signal and force touch signal occupy different frequency bands, they can therefore be separated by filtering.…”

Section: B Mechanism Of Piezoelectric Force Touch Sensingmentioning

confidence: 94%

“…Human finger touch is a low-frequency action, which is constrained to 10 Hz for most people [21]. However, although there are at most 10 touch events performed within one second, a touch induced electric signal can be up to 10 kHz, as they are triggered as ''impulse'' signals [21], [22]. This is demonstrated in Fig.…”

Section: B Mechanism Of Piezoelectric Force Touch Sensingmentioning

confidence: 99%

4-Dimensional Sensing in Interactive Displays Enabled by Both Capacitive and Piezoelectric Based Touch Panel

et al. 2019

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Interactive displays have been intensively used in consumer electronics, e.g., smartphones, for providing highly efficient human-machine interactions, assisting users to process a vast amount of data. However, current mainstream interactive displays only support 2-dimensional detection, strongly limiting user experience. In this paper, we present a piezoelectric and capacitive based technique for obtaining 4-dimensional detection, including (x-y axis) location, force, and hovers sensing in interactive displays.Here, electrodes are located on and underneath the piezoelectric layer, constructing a sandwich structured device. A self-capacitance-based technique is employed for location and hover sensing. Force-induced charges are collected and interpreted as force amplitude. As capacitive and piezoelectric sensing techniques occupy different frequency bands, these two signals can be smoothly separated, and 4-dimensional touch sensing is achieved concurrently, with the recognition of static force and hovers touch events.INDEX TERMS Interactive display, piezoelectric material, force sensing and hover touch sensing.

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