Optoma DS550 User Manual page 31

Source Lock
On: The projector will search specified connection port.
Off: The projector will search for other signals if the current input signal is
lost.
Bright Mode
ECO: Choose "ECO" to dim the projector lamp which will lower power
consumption and extend the lamp life by up to 120%.
Bright: Choose "Bright" to increase the brightness.
High Altitude
Use this function to allow the fans operates at full speed continuously to
achieve proper high altitude cooling of the projector.
OSD Timeout
Duration of OSD menu display countly starts (at idle state by second).
3D Mode
On: Enable 3D Mode function.
Off: Disable 3D Mode function.
When 3D Sync is set to "On", the settings for input source or broadcast
device are required as below:
1. For S-VIDEO and VIDEO input source, signal type should be NTSC (60).
2. For computer input source, the hardware and software requirements
should be Windows 7 operating system, 3D videos and professional 3D
video player softwares. Computer's output frequency should be 120Hz
and display card should be higher than NVIDIA 9800.
3D Sync Invert
On: Invert left and right frame contents.
Off: Default frame contents.
EN-31