PG-M10XE (serv.man4). Disassembly reassembly, Replacing the lamp, Block diagram of optical system principle, Optical adjustment measuring, Safety device, Troubleshooting table - Sharp Projector Service Manual (repair manual). Page 7

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G  B  R  W

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Names of parts and operating specifications

1

Lamp

2

RGBW color filter

3

Condenser lens and light tunnel

4

Reflection mirror 1 & 2

5

DMD chip

6

Projection lens

7

Screen

The AC light source lamp flickers 300 times per second.

This color filter splits the light into RGB and W components.
The W (White) component contributes to the reproduction
of bright white color.  The rotation-detecting sensor should
get in sync with the timing to turn off the lamp at the seam
of color filter.  The maximum rotating speed is 7200 rpm.

This lens condenses the light that is split in RGB and W
components by the color filter, and projects it to the
effective area of the reflection mirror 1.  Adoption of the
light tunnel has enhanced the illuminance ratio in
peripheral area of image, reducing the difference in
brightness between screen center and peripheries.  The
image can be reproduced clearly at every corner of the
screen.

This mirror reflects the light projected to the effective area
of the DMD.

This chip turns on and off in proportion to each color
component per dot depending on the input source.

This lens enlarges and projects the incident light coming
from the DMD.

Projected light (RGB and W components) is interpreted
by the viewer's eye as composite color image due to after-
image phenomenon.