스마트폰 터치스크린 상 버튼은 정보 제공을 방해하지 않으면서 조작 편의성이 담보되어야 한다. 즉, 버튼기능에 대한 정보식별을 수월하게하고 오조작 가능성을 낮춤과 동시에 가능한 작은 면적에 배치되도록 설계하여야 한다. 본 연구에서는 그 해결책으로 버튼이미지 영역의 일부만을 터치 여부 감지 영역으로 하는 방안을 제시하고 실험을 실시하였다. 실험은 버튼이미지와 감지영역이 일치하는 버튼(S유형버튼), 버튼이미지의 1/2영역만을 감지영역으로 하는 버튼(H유형버튼), 그리고 버튼이미지의 1/3영역만을 감지영역으로하는 버튼(T유형버튼)의 정상조작률과 조작소요시간을 측정하였다. 그 결과 정상조작률은 오차범위 내에서 H유형이 높게 나타났으며, 조작시간은 S유형이 가장 빠르게 나타났다. 그런데 오조작에 따른 추가소요시간을 감안한 결과 S유형과 H유형 버튼의 조작시간 차이는 사용자가 느끼기 어려운 수준으로, 조작 성공률이 높은 H유형 버튼을 적용하는 것이 바람직하다는 결론에 도달하였다.
Buttons on the smart phone touch-screen shall be guaranteed with convenience of operation while not interrupting the function of providing information. In other words, smart phone touch-screen buttons shall be designed so that they are distributed in smaller areas as much as possible while making it convenient to identify information on the button functions and reducing the chance of error in operation. This study has suggested plans of having a part of button image areas as a sense area for identifying whether to be touched as a solution and implemented an experiment. In the experiment, normal operation rate and operation lead-time were measured on a button that button image and sense areas were consistent with each other (S-type button), a button that a half of the button image area was a sense area (H-type button), and a button that only one-third button image area was a sense area (T-type button). As a result, normal operation rate was turned out to be the highest in H-type button in an error range, while operation lead-time was shown to be the fastest in S-type button. However, according to the result obtained after considering an additional lead-time from error in operation, the difference of lead-time between S-type and H-type buttons was barely recognizable by users. Therefore, a conclusion was drawn that it was desirable to apply H-type button with higher success rate of operation.