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1.4 System Protection Function
(1) Lamp Door Open Protection: There is a Door interlock switch built at bottom case. When lamp door is opened,
the switch will turn off the AC line power. Then the whole system will be shutdown immediately.
(2) Lamp Box Thermal Break Protection: There is a thermal break built around the lamp box. If the temperature of
lamp box goes too high, the thermal break will send out an alarm signal to hardware protection circuit. Then the
lamp will be turned off immediately.
(3) Ballast Over Heat Protection: There is an over heat protection circuit built on ballast board. When it alarm, the
ballast will shut down the lamp.
(4) Fan Spinning Abnormal Protection: There are 3 fans built on this system. MCU will do polling the fan spinning
status. If the speed of fan is abnormal, MCU will shut down the whole system.
(5) System Temperature Over Heat Protection: There are 3 temperature sensor built in the system. MCU will do
polling the temperature status. If the system temperature is over heat, MCU will shut down the whole system.
Chapter 2 DLP Operation Theory
2.1 Overview
The DLP is the abbreviation of Digital Light Processing technology. The DLP consists of DMD data formatting,
Color light sequencing processing, and the core component DMD chip. Please sees figure 4.
DMD data formatting circuit converts the digital image data to the format of DMD requested. The color light
sequencing processing controls the color light switching sequence and phase. The DMD controls light valve control of
each pixel.
The color wheel may have 4 color filter segments, 5 color filter segments, or 6 color filter segments. These filters will
modulate the light source output to the specific color of particular filter coating. Please see figure 5. When color wheel
spins around, those colors will be shining on the DMD chip reflective surface. So DMD just controls displaying the right
image color at the exact time sequence with color wheel motor. Then fine picture will be displayed out.
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