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Diagnostics for Light Measuring Devices in Flying-spot Display Measurements



Paul A. Boynton, Edward F. Kelley, S. Highnote, R. Hurtado


Flying-spot displays, such as some laser projection displays, use a high-energy beam as a light source that scans the image across the display screen. Each pixel can be a narrow, high-energy pulse. When such displays are measured with convential light-measuring devices (LMDs)such as luminance or illuminance meters, there is concern that the LMD may not accurately measure the display light output due to the unique characteristics of the source. The LMD may be unable to properly integrate the narrow pulses, or the high-energy signal may saturate the detector. As in all areas of metrology, it is essential to verify that the instruments used are providing the desired information. A diagnostic has been developed that allows fro an evaluation of LMDs for use in measuring flying-spot displays. This method tests for both integration and saturation errors using a bipartite comparator and a neutral density filter. The construction and procedure of the diagnostic is described. Limitations of the technique as well as sources of error are presented.
Proceedings Title
Projection Displays, Sixth in a Series Conf.
Conference Dates
January 24-25, 2000
Conference Location
San Jose, CA, USA
Conference Title
SPIE - The International Society for Optical Engineering


display measurements, flying-spot displays, laser displays, measurement diagnostics, projection displays


Boynton, P. , Kelley, E. , Highnote, S. and Hurtado, R. (2000), Diagnostics for Light Measuring Devices in Flying-spot Display Measurements, Projection Displays, Sixth in a Series Conf., San Jose, CA, USA, [online], (Accessed June 20, 2024)


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Created January 30, 2000, Updated October 12, 2021