Modeling of lamps through a diffuser with 2D and 3D picket-fence backlight models

Richard J. Belshaw; Roger Wilmott; John T. Thomas

doi:10.1117/12.480923

28 August 2002 Modeling of lamps through a diffuser with 2D and 3D picket-fence backlight models

Richard J. Belshaw, Roger Wilmott, John T. Thomas

Proceedings Volume 4712, Cockpit Displays IX: Displays for Defense Applications; (2002) https://doi.org/10.1117/12.480923
Event: AeroSense 2002, 2002, Orlando, FL, United States

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.

Citation Download Citation

Richard J. Belshaw, Roger Wilmott, and John T. Thomas "Modeling of lamps through a diffuser with 2D and 3D picket-fence backlight models", Proc. SPIE 4712, Cockpit Displays IX: Displays for Defense Applications, (28 August 2002); https://doi.org/10.1117/12.480923

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