Samsung Galaxy S III User Manual page 179

Screen timeout
Set the length of delay between the last key press or screen
touch and the automatic screen timeout (dim and lock).
1. From the Display menu, under Screen, touch
Screen timeout.
2. Touch a setting to select it.
Features
Smart rotation
When On, the Smart rotation feature adjusts the orientation
of the screen to your angle of sight.
From the Display menu, under Features, touch
Smart rotation to turn the feature On or Off.
Smart stay
When On, the Smart stay feature prevents screen timeout, if
you are using the phone. For example, the phone uses the
front camera to identify your eyes, and keeps the screen
bright for continued viewing.
From the Display menu, under Features, touch
Smart stay to turn the feature On or Off.
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Font
Font style
Set the font for screen displays.
1. From the Display menu, under Features, touch
Font style.
2. Select a font, or touch Get fonts online to browse and
download a new font.
Font size
Set the font size for screen displays.
1. From the Display menu, under Features, touch
Font size.
2. Select a font size (Tiny, Small, Normal, Large, or Huge).