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Hamamatsu Corp. - Earth Innovations LB 2/24

Efficient and uniform illumination with microlens-based band-limited diffusers

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Tasso R.M. Sales, RPC Photonics, Inc.

Uniform illumination over a certain target area is a common requirement in many applications, and oftentimes schemes must be devised to ensure that this requirement is achieved. In display systems, for example, light that illuminates a viewing interface such as a screen must appear uniform and devoid of any distracting image artifacts. Depending on the particularities of the system, different approaches must be developed to provide uniform illumination without sacrificing efficiency. Side-illuminated backlit displays use painted dots and microstructures to extract guided light in a...Read full article

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    Published: April 2010
    Glossary
    divergence
    1. In optics, the bending of rays away from each other. 2. In lasers, the spreading of a laser beam with increased distance from the exit aperture. Also called beam spread. 3. In a binocular instrument, the horizontal angular disparity between the two lines of sight.
    focal plane
    A plane (through the focal point) at right angles to the principal axis of a lens or mirror; that surface on which the best image is formed.
    fresnel
    A unit of frequency equivalent to 1012 cps. Named for Augustin Jean Fresnel, a French physicist known for his work in light and optics.
    geometrical optics
    The area of optics in which the propagation of light is described by geometrical lines (or rays) governed by Fermat's Principle. Geometrical optics is useful as long as the objects in which the light rays interact are much larger than the wavelength of the light (lenses, mirrors, stops, etc.). In geometrical optics, the wave nature of light is ignored and light is thought to travel in straight lines only to be reflected or refracted at a surface. Geometrical optics is the foundation for the...
    laser speckle
    Sparkling granular pattern that is observed when an object diffusely reflects coincident laser light. Speckle appears as an irregularity in many holographs but has been exploited as a measurement technique. See also speckle metrology.
    screen
    The large, usually flat surface onto which an image is projected for viewing. May be reflecting or transmitting (rear projection).
    speckle pattern
    A power intensity pattern produced by the mutual interference of partially coherent beams that are subject to minute temporal and spatial fluctuations.
    spectrum
    See optical spectrum; visible spectrum.
    arrayband-limitedBasic Sciencebinary elementblue curvebright center spot collinearcoherenceConsumerdiffraction artifactsDisplaysdivergenceenergyeye microlens arraysfabrication errorFeaturesfocal planeFresnelGaussian scattergeneral lightinggeometrical opticsholographicincident illuminationindustrialInterfaceKodaklaser displaylaser specklelenseslight scatteredLight SourceslightingLorentzianmicrolensmicrolensesMicrostructuresmonochromatic illuminationoptical diffuserspainted dotsperiodic lens arraysprismatic filmsRPC PhotonicsscatterscreenSensors & Detectorsside-illuminated backlit displaysslope anglesspeckle patternspectrumTasso SalesTasso R.M. Salesuniform illuminationLasersLEDs

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