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I just finished my pj, and the results look good so far. The brightness of the picture appears to be pretty even, and I do not have any spillage around the lens. However, the overall brightness needs to be improved. I still have to install my reflector and seal the light leakage in the pj, espcially around the LCD, as there is leakage on the top and bottom of the LCD frame. Besides these things, what else can be done to improve overall brightness?
The following items will directly impact brightness:
- Adding a reflector.
- Using a different bulb.
- Using a different monitor (some monitors have a different antiglare coating on front, which can reduce brightness).
- Reducing the number of sheets of glass/lexan that are in the design.
- Adjusting the spacing of the bulb to the fresnels, the fresnels to the monitor, and the focal point to the projection lens.
- Making adjustments to the projected image, by adjusting contrast of the monitor, tweaking your N6 (if you're using that), or tweaking settings in your HTPC (if you're using that).
The following items will improve picture quality by reducing off-axis light:
- Sealing light leaks.
- Getting rid of ambient light in the room.
- Using a projection screen (may introduce hot spots).
- Avoiding reflection from bright surfaces (white walls and ceilings, etc.)
The following items will improve perceived picture quality:
- Having a felt black border.
There is a point at which things are bright enough. Commercial LCD data projectors are too bright, and detract from the movie experience. Note that commercial projectors designed for movies are not as bright as the projectors designed for powerpoint presentations. (So if you're using an office projector you've seen as the standard you're aiming for, you're aiming too high.)