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VOB Lumex for Illumination Design

Sample: Backlight Illumination for Liquid Crystal Displays 1



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Principal set-up of a backlight system (cross section of a side light type). The light of a source on the left is coupled into a rectangular light guiding plate (Lichtleiterplatte). The light travels through the light guiding plate with total internal reflections. In order to couple out light perpendicular to the plate towards the liquid crystal display plate (LCDP) the total internal reflections have to be disturbed. A prism sheet in optical contact with the light guiding plate may be used as an output coupler (see next figure).



The image of a backlight system as displayed by VOB Lumex. The light is coupled out by a prism sheet (P) on top of the rectangular light guiding plate (LGP). The density of the prisms is progressively increased with the distance from the lamp in order to compensate for the weakening of the light due to coupling out. The front flat mirror surface is set to 'Invisible' for better model visualization.
L:Lamp, R: Lamp reflector, LGP: Light guiding plate, P: Prism sheet



The image of a backlight system as displayed by VOB Lumex with traces of light rays. The front flat mirror surface is set to 'Invisible' for better model visualization.



The clipped image of a backlight system as displayed by VOB Lumex with traces of light rays. The front flat mirror surface is set to 'Invisible' for better model visualization.



The image of a backlight system with prism sheet on top as displayed by VOB Lumex. The analyzing plane with the color map of illuminance is placed on top of the prism sheet. The front flat mirror surface is set to 'Invisible' for better model visualization.


Clipped image of a backlight system with prism sheet on top as displayed by VOB Lumex with traces of light rays. The analyzing plane with the color map of illuminance is placed on top of the prism sheet. The front flat mirror surface is set to 'Invisible' for better model visualization. AP: Analyzing plane, P: Prism sheet, LGP: Light guiding plate, RER: Rear end reflector





The color map and the graph along the center long axes of the maps for a backlight system.


Angular distribution


See also: V. G. Chernenko, Dr., A. O. Fedoroff, Dr., LG SOFT LAB, V. H. Schmidt, Dr.*, TEC++ DR. VOLKER SCHMIDT GMBH
"VOB LUMEX - Optical Design Program for Backlight Illumination Systems"
17th Electronics Displays 2002, 4-5 Sept. 2002, Conference Volume, NETWORK-OSE GmbH, Hagenburg, Germany, page 71-77, 2002

More samples?
The trial version of VOB Lumex contains a lot of samples covering nearly any application of illumination programs. Use these samples as starting points for own designs.

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