Force-touch measurement methodology based on user experience

Abstract

The touch interface is an input method widely used in smart devices. Recently, new touch interface which supports force value has been introduced. The force-touch interface adds a factor called depth to the plane coordinates as compared to the existing touch interface. Despite the advantages of force-touch, which can provide touch position and force intensity information with one input, there are still many devices that cannot support force values. To provide them with a force-touch interface, we developed a force-touch cover for existing smart devices that do not support the existing force value. It is a way to provide the force value to the smart device by recognizing the force value through the sensor installed in smartphone case. However, it is difficult to apply the force value obtained through such a device directly to the force-touch interface, because it is necessary to distinguish between force touch and general touch. Therefore, in order to use the force-touch interface using the force-touch cover proposed in this article, the force value measured at the time of general touch is analyzed by user experiment to set the general touch area. Also, an area outside the general touch area is set as the force-touch area. In the force-touch and general touch area, the area is applied considering the error of the force value actually measured in the developed force-touch cover. Therefore, in this article, we analyze the force value input through the proposed force-touch cover and find a reference value that can distinguish force touch from general touch by user experiment and propose a method to apply it.

Piezoelectric Based Touch Sensing for Interactive Displays—A Short Review

“…Among the related studies, the keystroke-based technique that extracts user’s touch behaviors, such as touch time and force amplitude, to detect emotion is advantageous for its low cost [ 57 ]. However, using touch sensing products that have low accuracy will result in long-term text input, and therefore limits its use [ 58 ]. Due to the high sensitivity of the piezoelectric touch panel, it can achieve high accuracy without long text input and is a suitable approach for detecting emotion.…”

Time Threshold for Classification between 2D-Touch and 3D-Touch Based on User’s 3D-Touch Input

“…It raised a problem that if a user performs 3D-Touch against low pressure, the error rate could increase. In addition, the research was conducted on the basis of 2D-Touch to distinguish 2D-Touch and 3D-Touch [9]. When user press the display with any pressure on 2D-Touch, can't measure any pressure after 200ms.…”

Piezoelectric Touch Sensing and Random-Forest-Based Technique for Emotion Recognition

“…Ghosh et al [40] collect users' typing and swiping features for 3 weeks on an Andriod smartphone and achieve an average accuracy of 73% on 4 motions by a random forest (RF) model. However, these studies require users' long-term text input, because of the unsatisfied forcesensing precision supported by the current mainstream touch sensing products [41][42].…”