This Month's Tech Tip
Perforated Screen Tips
In many home entertainment applications, a perforated screen is often utilized. As in commercial cinemas, this allows transparent sound to radiate from the center channel behind the screen.
Although rare, when using any fixed resolution projection device, including DLP™ technology on a perforated screen, a moiré pattern may sometimes be a visible artifact. The moiré is caused by the interaction of the DLP™ mirror array, or the source frequency, with the screen perforation pattern.
If you experience this phenomenon, you can minimize moiré by applying some or all of the
following steps:
- Slightly increase the size of the projected image. Use projector blanking to mask the overshoot of the image.
- Adjust the projector pixel clock for the source.
- If the above options do not work, slightly defocus the image.
- If all else fails, consider utilizing a perforated screen with a different perforation pitch.
- Dealers and Special Contractors may purchase up to
two demo units per calendar year.
- Demo units may be purchased at 5% off of DPI's published
end column Commercial AV dealer pricing (End Column x .95).
- Excluding iVision, which already comes standard with a lens, the 5% demo discount may also be applied to (1) projection lens for each demo projector purchased.
- Dealers in good credit standing receive standard payment terms - 2% cash with order, 1% 10 days, net 30 days.
Updated Forms:
