The user wants to clean the touch screen.

The figure shows the clean screen pattern on a touch screen with capacitive technology.

Context

The user needs to interrupt his work to clean the touch screen.

Forces

The challenge here is to lock the touch screen for cleaning so no other functions are activated inadvertently but to still give the user minimum information about ongoing events.

Solution

Display a full screen with a slider control that prevents ending the cleaning mode inadvertently and allows wiping the screen. The cleaning mode ends when the user presses the four buttons consecutively. Cleaning mode ends automatically upon certain safety-critical events, e.g., when emergency calls come in.

Usability Impact

Error prevention, user satisfaction

Your opinion!

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