12 April 1999 Stray light elimination in making projection display measurements
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Proceedings Volume 3636, Flat Panel Display Technology and Display Metrology; (1999); doi: 10.1117/12.344651
Event: Electronic Imaging '99, 1999, San Jose, CA, United States
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 of 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 a stray-light elimination tube are presented as solutions that can provide an accurate measurement of projector light output in many ambient light conditions.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Paul A. Boynton, Edward F. Kelley, "Stray light elimination in making projection display measurements", Proc. SPIE 3636, Flat Panel Display Technology and Display Metrology, (12 April 1999); doi: 10.1117/12.344651; https://doi.org/10.1117/12.344651
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KEYWORDS
Projection systems

Stray light

Reflectivity

Optical testing

Standards development

Light

Reflection

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