Changing the viewing mode
ABOUT VIEWING MODES
The display contains two viewing modes. Diagnostic viewing mode provides the full calibrated luminance. This mode is intended for using the display in diagnostic applications.
In Text mode, the luminance is approximately half of the luminance in Diagnostic mode. This is intended for using the display with office applications such as word processing.
SWITCHING VIEWING MODES BY MEANS OF THE KEYS
While the OSD is not on the screen, touch the Up 
and Down 
touch keys at the same time. As a result the display switches to another viewing mode. The viewing mode is indicated by a message that appears for a few seconds after switching the viewing mode.
SWITCHING VIEWING MODES BY MEANS OF THE OSD MENUS
You can also switch viewing modes in the Luminance and color menu.
Enabling/disabling User Controls
TO DISABLE THE USER CONTROLS:
1Open the OSD main menu.
2Open the Settings menu.
3Select User Controls.
4Select Off.
5Return to the Settings menu.
6Exit the OSD
Now the user cannot display the OSD again until the user controls keycode is entered (see below).