Stray light compensation in small area contrast measurements of projection displays

Published

January 23, 2002

Author(s)

Paul A. Boynton, Edward F. Kelley

Abstract

The accurate measurement of small area black levels is important in projection display characterization. For example, techniques can be used to determine resolution of projection systems by measuring the contrast of alternating grill patterns or fully-modulated sine waves of various spatial frequencies. Unfortunately, the measurement of the contrast of these patterns may be influenced by stray light, either from ambient and reflected light in the environment, or from veiling glare scatter in the lens of the light-measuring device. Such stray-light corruption can lead to large errors in contrast determination, providing an inaccurate characterization of the projector. For large-area measurements, various techniques have been employed, including the use of frustums and masks, to minimize such unwanted effects and provide a more accurate measurement. With some modifications, these same tools may be used for small-area measurements with similar results. The design, construction, and implementation of these tools will be discussed. Results will be shown comparing small-area contrast measurements of projection systems, including resolution determination, with and without stray light compensation, for different measurement instrumentation.

Proceedings Title

Proc. Intl. Soc. for Optical Engineering (SPIE)

Volume

4657

Conference Dates

January 23-24, 2002

Conference Location

San Jose, CA, USA

Conference Title

Projection Display VIII

Pub Type

Conferences

Download Paper

Local Download

Keywords

projection displays, replica mask, resolution, small area contrast, stray light, display measurement

Citation

Boynton, P. and Kelley, E. (2002), Stray light compensation in small area contrast measurements of projection displays, Proc. Intl. Soc. for Optical Engineering (SPIE), San Jose, CA, USA, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=30086 (Accessed January 15, 2025)