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Difficulty: MediumVideo, Display, and Projector Issues

A technician is setting up a ceiling-mounted projector in a conference room. When projecting a test pattern onto the flat screen, the image appears distorted as a trapezoid, where the top edge of the image is noticeably wider than the bottom edge. The projector is mounted securely and cannot be physically repositioned. Which of the following projector settings should the technician adjust to flatten the image into a proper rectangular shape?

  1. Keystone correctionAnswer
  2. B
    Inverter board output voltage
  3. C
    Video driver artifact suppression
  4. D
    Display cable bandwidth downscaling

Answer

Keystone correction should be configured on the projector to correct the trapezoidal image distortion.
Keystone correction is designed specifically to solve trapezoidal image distortion caused by angled projection when the projector lens is not perfectly perpendicular to the screen.

Step-by-Step Solution

1
Identify the type of display symptom.
The symptom is trapezoidal image distortion, where the top of the projected image is wider than the bottom.
This occurs when the optical axis of a projector is not perpendicular to the projection surface.
2
Select the appropriate feature on the projector.
Keystone correction adjusts the output shape to compensate for angle distortion.
When physical repositioning is not feasible, keystone settings digitally reshape the image back to a standard rectangular format.

Key Concept

Projector Keystone Correction
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Topics

Video, Display, and Projector Issues

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