However, the vibration generated from a linear motor is far away from a real-like key click effect. To this end, a low-cost linear motor has been widely used for mobile phones to create synchronized vibrations when phone users type on the touchscreen. Nevertheless, most of the users are not satisfied even with a better-designed soft keyboard since lack of physical key pressing feedback is the most frustrating thing when typing on a touchscreen. One of the good examples is to analyze and optimize keystroke patterns on touchscreens in order to improve key typing productivity. For this reason, studies to design a better soft keyboard have been actively conducted for the past years. One of the most used functions is the soft keyboard input method which is very important for productive interaction on the touchscreen of a mobile device. With advancement in touchscreen technologies, users get used to various functions of mobile devices through touch interactions. The proposed system was developed on a commercial tablet (Mu Pad) that has dual platforms (Android and Windows). The evaluation results confirm platform independency, fast tactile key click feedback, and uniform tactile force distribution on touchscreen with using only two piezoelectric actuators. The developed haptic soft keyboard can be easily integrated with existing tablets by putting the least amount of effort. In addition, a psychophysical experiment has been conducted to find an optimal strength of key click feedback on touchscreens, and the perception result was applied for making uniform tactile forces on touchscreens. The platform-independent haptic soft keyboard was verified on both Android and Windows. To solve the problem, a platform-independent haptic soft keyboard suitable for tablet-sized touchscreens was proposed and developed. However, many users are experiencing discomfort due to lack of physical feedback that causes slow typing speed and error-prone typing, as compared to the physical keyboard. Most mobile devices equipped with touchscreens provide on-screen soft keyboard as an input method.
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