As an example of an easily attachable and detachable feature for portable devices,Fukumoto (2009) placed a soft-gel based transparent film named “PuyoSheet” over the surface of an iPod Touch to provide a button-push feeling when touching it with the fingertips. PuyoSheet, having zero degrees on the ASKER-C scale, consisted of a 50-μm-thick PET film and a 0.95-mm-thick urethane gel. The upper surface of the urethane gel-film was covered with a thin transparent PET film to prevent users from feeling high friction in their fingertips when dragging across the touch panel. The evaluation of performance and user impressions of PuyoSheet was conducted using finger touch, not stylus touch. Kim and Lee (2012) examined the effects of “Texture Plate,” which was developed using a transparent OHP film (0.1 mm thick). They collected data on typing performance and user preference through auditory feedback. Texture Plate comprised two layers of film thin enough to not affect the capability of capacitive sensing on the iPad. Notably, none of the related work mentioned above addressed the issue of using a stylus on soft-surface touch interfaces; therefore, both finger and stylus were used as input devices in the current study.
As an example of an easily attachable and detachable feature for portable devices,Fukumoto (2009) placed a soft-gel based transparent film named “PuyoSheet” over the surface of an iPod Touch to provide a button-push feeling when touching it with the fingertips. PuyoSheet, having zero degrees on the ASKER-C scale, consisted of a 50-μm-thick PET film and a 0.95-mm-thick urethane gel. The upper surface of the urethane gel-film was covered with a thin transparent PET film to prevent users from feeling high friction in their fingertips when dragging across the touch panel. The evaluation of performance and user impressions of PuyoSheet was conducted using finger touch, not stylus touch. Kim and Lee (2012) examined the effects of “Texture Plate,” which was developed using a transparent OHP film (0.1 mm thick). They collected data on typing performance and user preference through auditory feedback. Texture Plate comprised two layers of film thin enough to not affect the capability of capacitive sensing on the iPad. Notably, none of the related work mentioned above addressed the issue of using a stylus on soft-surface touch interfaces; therefore, both finger and stylus were used as input devices in the current study.
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