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Proceedings Paper

Modeling of lamps through a diffuser with 2D and 3D picket-fence backlight models
Author(s): Richard J. Belshaw; Roger Wilmott; John T. Thomas
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Paper Abstract

Laboratory photometric measurements are taken of a display backlight one metre away from the emission surface (diffuser) with a whole acceptance angle on the photometer of about 0.125 degrees (2.182mm spot size at emission surface). A simulation method was sought to be able to obtain the brightness uniformity (luminance peak to trough ratio from above one lamp to the null between lamps in a picket-fence backlight). A 3D raytrace BackLight model in TracePro and a 2D Mathematical model in Matlab have been developed. With a specimen backlight in the laboratory, a smooth luminance profile was measured by the photometer on the diffuser surface. Ray Trace models in both 3D and 2D take too long to produce smooth 'continuous filled' distributions. The Mathematical 2D approach, although with limitations, yielded smooth solutions in a very reasonable time frame.

Paper Details

Date Published: 28 August 2002
PDF: 13 pages
Proc. SPIE 4712, Cockpit Displays IX: Displays for Defense Applications, (28 August 2002); doi: 10.1117/12.480923
Show Author Affiliations
Richard J. Belshaw, General Dynamics Canada Ltd. (Canada)
Roger Wilmott, General Dynamics Canada Ltd. (Canada)
John T. Thomas, General Dynamics Canada Ltd. (Canada)


Published in SPIE Proceedings Vol. 4712:
Cockpit Displays IX: Displays for Defense Applications
Darrel G. Hopper, Editor(s)

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