Light Measuring Device Diagnostics for the Photometric and Colorimetric Measurement of Flying-spot Displays
Paul A. Boynton, Edward F. Kelley
Flying-spot displays use narrow-spectrum high-power sources that scan the image across the display screen. They can provide a bright display with a large color gamut. When such displays are measured with conventional light-measuring devices (LMDs) such as luminance or illuminance meters, there is concern that the LMD may not accurately measure the display=s photometric and colorimetric output. The unique characteristics of the source may exceed the limitations of the instrumentation. A series of diagnostics has been developed that allows for an evaluation of LMDs for use in measuring flying-spot displays. Limitations due to LMD saturation, timing, and tristimulus or photopic filters can be revealed, and in some cases, specific causes can be identified. Each diagnostic will be demonstrated using several instruments, including luminance meters, illuminance meters, colorimeters and spectroradiometers. Using a simple comparison box, flying-spot displays can be viewed side-by-side with CW sources in a bi-partite image. After the sources have been visually matched in color and luminance, the two images can be measured (light output and color) with a particular LMD, and results compared. Any significant difference between results would indicate a limitation of the LMD. Further diagnostics, using integrating spheres, neutral density filters, and interference filters, are used to aid in identifying the nature of the limitation, and in some cases, point to solutions.
Flat Panel Display Technology and Display Metrology II
January 22-23, 2001
San Jose, CA, USA
SPIE - The International Society for Optical Engineering
and Kelley, E.
Light Measuring Device Diagnostics for the Photometric and Colorimetric Measurement of Flying-spot Displays, Flat Panel Display Technology and Display Metrology II, San Jose, CA, USA
(Accessed December 4, 2023)