Stray Light Elimination in Making Projection Display Measurements

Published

July 1, 1999

Author(s)

Paul A. Boynton, Edward F. Kelley

Abstract

Electronic front-projection display specifications are often based on measurements made in ideal darkroom conditions. However, not everyone has access to such a facility. In many environments, ambient light from other sources in the room illuminates the screen. This includes room lights directly illuminating the screen and the reflection of these light sources off walls, floors, furniture, and other objects. Additionally, back-reflections from the projection screen must be considered. These stray light components contribute to the measured value, giving an inaccurate measurement of the projector light output. Thus, these conditions may make the task of adequately comparing and evaluating different projection systems difficult. We can better verify whether the projector is operating according to its specifications or compare its performance with other projectors by compensating for stray light. A simple projection mask constructed from black plastic and stray-light elimination tube are presented as solutions that can provide an accurate measurement of projector light output in many ambient light conditions.

Proceedings Title

Proc. Intl. Soc. for Optical Engineering (SPIE) Conf. on Flat Panel Display Technology and Display Metrology

Volume

3636

Conference Dates

January 27-29, 1999

Conference Location

San Jose, CA

Pub Type

Conferences

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Local Download

Keywords

display measurements, projection displays, projection mask, reflections, stray light

Citation

Boynton, P. and Kelley, E. (1999), Stray Light Elimination in Making Projection Display Measurements, Proc. Intl. Soc. for Optical Engineering (SPIE) Conf. on Flat Panel Display Technology and Display Metrology, San Jose, CA, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=15478 (Accessed May 12, 2026)

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