Notizie aziendali su A Brief Discussion on Projector Lens Offset

A Brief Discussion on Projector Lens Offset

2026-08-27

Projector lens offset refers to the misalignment of the center of the display chip (DMD, LCoS, LCD, etc.) with the lens's optical axis. Ordinary lenses project light with the lens center as the reference point. Therefore, if a projector is placed flat on a table without a stand, part of the image may be projected onto the table, resulting in an incomplete display.

Offset lenses are designed to solve this problem. By offsetting the display chip relative to the optical axis, the image is projected completely onto the screen directly in front of the projector even when it is placed horizontally, thus avoiding image clipping. A specific illustration is shown below:

While tilting the projector can also produce a complete image without offset, this leads to severe trapezoidal distortion. Although algorithms can correct this, the degree of trapezoidal distortion varies depending on the projector's placement, making effective control difficult. Furthermore, tilting the projector also causes variations in sharpness, making it difficult to fundamentally solve the problem.

Assuming the display chip has a length of *a*, a width of *b*, and an offset of *c*, the system's eccentricity *d* is:

Eccentricity *d* is a percentage. When the eccentricity is 100%, it means the chip has moved by half the screen width. To ensure the image plane is not obstructed, the eccentricity *d* needs to be ≥100%. The total half-image height *y* after the offset can be calculated using the following formula:

The overall focal length remains consistent before and after the offset. The total field of view (FOV) after the offset can be calculated using the following formula:

Based on the newly obtained total half-image height *y* and total FOV, the design of the off-center projection lens can be performed.

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