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Video Projectors

A video projector takes a video signal and projects the corresponding image on a projection screen using a lens system. All video projectors use a very bright light to project the image, and most modern ones can correct any curves, blurriness, and other inconsistencies through manual settings. Video projectors are widely used for conference room presentations, classroom training, and home theatre applications.

A video projector used in church, may be built into a cabinet with a rear-projection screen to form a single unified display projected on a screen mounted in the wall.

Common projector display resolutions for a portable projector include SVGA (800×600 pixels), XGA (1024×768 pixels), 720p (1280×720 pixels), and 1080p (1920×1080 pixels).

The cost of a projector is not only determined by its resolution, but also by its light output, acoustic noise output, contrast, and other characteristics. While most modern projectors provide sufficient light for a small screen at night, it may not be the proper projector for daytime lighted use. A projector with a higher light output (measured in ANCI lumens) is required for a larger screen or a room with a higher amount of ambient light. A rating of 1500 to 2500 ANSI lumens or lower is suitable for smaller church screens with controlled lighting or low ambient light. Between 2500 and 4000 ANCI is suitable for medium-sized screens with some ambient light or dimmed light. Over 4000 ANCI is appropriate for 10 to 12 foot wide screens in a large room with no lighting control. Projected image size is important; because the total amount of light does not change, as size increases, brightness decreases. Image sizes are typically measured in linear terms, diagonally. Large images require much more light. Increasing the diagonal measure of the projected image by 25% reduces the image brightness by 35%; an size increase of 41% reduces brightness by half.

Projection technologies

  • LCD projector using a LCD light gate. This is the simplest system, making it one of the most common and affordable for home theaters and church use. Its most common problem is a visible “screen door” or pixelation effect, although recent advances have reduced this.
  • DLP projector using Texas Instruments’ DLP projection technology. DLP uses one, two, or three microfabricated light valves called digital micromirror devices (DMDs). The single- and double-DMD versions use rotating color wheels in time with the mirror refreshes to modulate color. The most common problem with the single- or two-DMD varieties is a visible “rainbow” which some people perceive when moving their eyes.
  • Recent projectors with higher speed optimised color wheels have lessened this artifact. Systems with 3 DMDs do not have this problem, as they display each primary color simultaneously.

Recommendation for Church Video

  • For the worship area select projector with a brightness of at least 3500 ANSI.
  • Do not be concerned with display resolations as all content with reading will be in large characters.
  • Plan to install at least a 6 x 8 foot screen. Screens up to 10 wide will be suitable for a 3500 ANCI projector.
  • DLP technology is first choice with LED second.
  • Consider a projector with network and wireless capability
  • Choose a brand with history and sales volume
  • Recommended brands